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* Add the HCI driver 

* Add a missing destroy_workqueue() in an error path
 * Flag Alexandre Belloni as the new maintainer
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Merge tag 'i3c/for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux

Pull i3c updates from Boris Brezillon:

 - Add the HCI driver

 - Add a missing destroy_workqueue() in an error path

 - Flag Alexandre Belloni as the new maintainer

* tag 'i3c/for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux:
  i3c/master/mipi-i3c-hci: quiet maybe-unused variable warning
  i3c: Resign from my maintainer role
  i3c/master: Fix uninitialized variable next_addr
  i3c/master: introduce the mipi-i3c-hci driver
  dt-bindings: i3c: MIPI I3C Host Controller Interface
  i3c master: fix missing destroy_workqueue() on error in i3c_master_register
This commit is contained in:
Linus Torvalds 2020-12-19 12:46:52 -08:00
Родитель 11c336526e 95393f3e07
Коммит 190daf1920
21 изменённых файлов: 4316 добавлений и 2 удалений
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47
Documentation/devicetree/bindings/i3c/mipi-i3c-hci.yaml Normal file
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@ -0,0 +1,47 @@
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: "http://devicetree.org/schemas/i3c/mipi-i3c-hci.yaml#"
$schema: "http://devicetree.org/meta-schemas/core.yaml#"
title: MIPI I3C HCI Device Tree Bindings
maintainers:
- Nicolas Pitre <npitre@baylibre.com>
description: |
MIPI I3C Host Controller Interface
The MIPI I3C HCI (Host Controller Interface) specification defines
a common software driver interface to support compliant MIPI I3C
host controller hardware implementations from multiple vendors.
The hardware is self-advertising for differences in implementation
capabilities, including the spec version it is based on, so there
isn't much to describe here (yet).
For details, please see:
https://www.mipi.org/specifications/i3c-hci
properties:
compatible:
const: mipi-i3c-hci
reg:
maxItems: 1
interrupts:
maxItems: 1
required:
- compatible
- reg
- interrupts
additionalProperties: false
examples:
- |
i3c@a0000000 {
compatible = "mipi-i3c-hci";
reg = <0xa0000000 0x2000>;
interrupts = <89>;
};

2
MAINTAINERS
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@ -8416,7 +8416,7 @@ F: Documentation/devicetree/bindings/i3c/snps,dw-i3c-master.txt
F: drivers/i3c/master/dw*
I3C SUBSYSTEM
M: Boris Brezillon <bbrezillon@kernel.org>
M: Alexandre Belloni <alexandre.belloni@bootlin.com>
L: linux-i3c@lists.infradead.org (moderated for non-subscribers)
S: Maintained
C: irc://chat.freenode.net/linux-i3c

5
drivers/i3c/master.c
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@ -2537,7 +2537,7 @@ int i3c_master_register(struct i3c_master_controller *master,
ret = i3c_master_bus_init(master);
if (ret)
goto err_put_dev;
goto err_destroy_wq;
ret = device_add(&master->dev);
if (ret)
@ -2568,6 +2568,9 @@ err_del_dev:
err_cleanup_bus:
i3c_master_bus_cleanup(master);
err_destroy_wq:
destroy_workqueue(master->wq);
err_put_dev:
put_device(&master->dev);

13
drivers/i3c/master/Kconfig
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@ -21,3 +21,16 @@ config DW_I3C_MASTER
This driver can also be built as a module. If so, the module
will be called dw-i3c-master.
config MIPI_I3C_HCI
tristate "MIPI I3C Host Controller Interface driver (EXPERIMENTAL)"
depends on I3C
help
Support for hardware following the MIPI Aliance's I3C Host Controller
Interface specification.
For details please see:
https://www.mipi.org/specifications/i3c-hci
This driver can also be built as a module. If so, the module will be
called mipi-i3c-hci.

1
drivers/i3c/master/Makefile
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@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_CDNS_I3C_MASTER) += i3c-master-cdns.o
obj-$(CONFIG_DW_I3C_MASTER) += dw-i3c-master.o
obj-$(CONFIG_MIPI_I3C_HCI) += mipi-i3c-hci/

6
drivers/i3c/master/mipi-i3c-hci/Makefile Normal file
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@ -0,0 +1,6 @@
# SPDX-License-Identifier: BSD-3-Clause
obj-$(CONFIG_MIPI_I3C_HCI) += mipi-i3c-hci.o
mipi-i3c-hci-y := core.o ext_caps.o pio.o dma.o \
cmd_v1.o cmd_v2.o \
dat_v1.o dct_v1.o

67
drivers/i3c/master/mipi-i3c-hci/cmd.h Normal file
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@ -0,0 +1,67 @@
/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* Common command/response related stuff
*/
#ifndef CMD_H
#define CMD_H
/*
* Those bits are common to all descriptor formats and
* may be manipulated by the core code.
*/
#define CMD_0_TOC W0_BIT_(31)
#define CMD_0_ROC W0_BIT_(30)
#define CMD_0_ATTR W0_MASK(2, 0)
/*
* Response Descriptor Structure
*/
#define RESP_STATUS(resp) FIELD_GET(GENMASK(31, 28), resp)
#define RESP_TID(resp) FIELD_GET(GENMASK(27, 24), resp)
#define RESP_DATA_LENGTH(resp) FIELD_GET(GENMASK(21, 0), resp)
#define RESP_ERR_FIELD GENMASK(31, 28)
enum hci_resp_err {
RESP_SUCCESS = 0x0,
RESP_ERR_CRC = 0x1,
RESP_ERR_PARITY = 0x2,
RESP_ERR_FRAME = 0x3,
RESP_ERR_ADDR_HEADER = 0x4,
RESP_ERR_BCAST_NACK_7E = 0x4,
RESP_ERR_NACK = 0x5,
RESP_ERR_OVL = 0x6,
RESP_ERR_I3C_SHORT_READ = 0x7,
RESP_ERR_HC_TERMINATED = 0x8,
RESP_ERR_I2C_WR_DATA_NACK = 0x9,
RESP_ERR_BUS_XFER_ABORTED = 0x9,
RESP_ERR_NOT_SUPPORTED = 0xa,
RESP_ERR_ABORTED_WITH_CRC = 0xb,
/* 0xc to 0xf are reserved for transfer specific errors */
};
/* TID generation (4 bits wide in all cases) */
#define hci_get_tid(bits) \
(atomic_inc_return_relaxed(&hci->next_cmd_tid) % (1U << 4))
/* This abstracts operations with our command descriptor formats */
struct hci_cmd_ops {
int (*prep_ccc)(struct i3c_hci *hci, struct hci_xfer *xfer,
u8 ccc_addr, u8 ccc_cmd, bool raw);
void (*prep_i3c_xfer)(struct i3c_hci *hci, struct i3c_dev_desc *dev,
struct hci_xfer *xfer);
void (*prep_i2c_xfer)(struct i3c_hci *hci, struct i2c_dev_desc *dev,
struct hci_xfer *xfer);
int (*perform_daa)(struct i3c_hci *hci);
};
/* Our various instances */
extern const struct hci_cmd_ops mipi_i3c_hci_cmd_v1;
extern const struct hci_cmd_ops mipi_i3c_hci_cmd_v2;
#endif

378
drivers/i3c/master/mipi-i3c-hci/cmd_v1.c Normal file
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@ -0,0 +1,378 @@
// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* I3C HCI v1.0/v1.1 Command Descriptor Handling
*/
#include <linux/bitfield.h>
#include <linux/i3c/master.h>
#include "hci.h"
#include "cmd.h"
#include "dat.h"
#include "dct.h"
/*
* Address Assignment Command
*/
#define CMD_0_ATTR_A FIELD_PREP(CMD_0_ATTR, 0x2)
#define CMD_A0_TOC W0_BIT_(31)
#define CMD_A0_ROC W0_BIT_(30)
#define CMD_A0_DEV_COUNT(v) FIELD_PREP(W0_MASK(29, 26), v)
#define CMD_A0_DEV_INDEX(v) FIELD_PREP(W0_MASK(20, 16), v)
#define CMD_A0_CMD(v) FIELD_PREP(W0_MASK(14, 7), v)
#define CMD_A0_TID(v) FIELD_PREP(W0_MASK( 6, 3), v)
/*
* Immediate Data Transfer Command
*/
#define CMD_0_ATTR_I FIELD_PREP(CMD_0_ATTR, 0x1)
#define CMD_I1_DATA_BYTE_4(v) FIELD_PREP(W1_MASK(63, 56), v)
#define CMD_I1_DATA_BYTE_3(v) FIELD_PREP(W1_MASK(55, 48), v)
#define CMD_I1_DATA_BYTE_2(v) FIELD_PREP(W1_MASK(47, 40), v)
#define CMD_I1_DATA_BYTE_1(v) FIELD_PREP(W1_MASK(39, 32), v)
#define CMD_I1_DEF_BYTE(v) FIELD_PREP(W1_MASK(39, 32), v)
#define CMD_I0_TOC W0_BIT_(31)
#define CMD_I0_ROC W0_BIT_(30)
#define CMD_I0_RNW W0_BIT_(29)
#define CMD_I0_MODE(v) FIELD_PREP(W0_MASK(28, 26), v)
#define CMD_I0_DTT(v) FIELD_PREP(W0_MASK(25, 23), v)
#define CMD_I0_DEV_INDEX(v) FIELD_PREP(W0_MASK(20, 16), v)
#define CMD_I0_CP W0_BIT_(15)
#define CMD_I0_CMD(v) FIELD_PREP(W0_MASK(14, 7), v)
#define CMD_I0_TID(v) FIELD_PREP(W0_MASK( 6, 3), v)
/*
* Regular Data Transfer Command
*/
#define CMD_0_ATTR_R FIELD_PREP(CMD_0_ATTR, 0x0)
#define CMD_R1_DATA_LENGTH(v) FIELD_PREP(W1_MASK(63, 48), v)
#define CMD_R1_DEF_BYTE(v) FIELD_PREP(W1_MASK(39, 32), v)
#define CMD_R0_TOC W0_BIT_(31)
#define CMD_R0_ROC W0_BIT_(30)
#define CMD_R0_RNW W0_BIT_(29)
#define CMD_R0_MODE(v) FIELD_PREP(W0_MASK(28, 26), v)
#define CMD_R0_DBP W0_BIT_(25)
#define CMD_R0_DEV_INDEX(v) FIELD_PREP(W0_MASK(20, 16), v)
#define CMD_R0_CP W0_BIT_(15)
#define CMD_R0_CMD(v) FIELD_PREP(W0_MASK(14, 7), v)
#define CMD_R0_TID(v) FIELD_PREP(W0_MASK( 6, 3), v)
/*
* Combo Transfer (Write + Write/Read) Command
*/
#define CMD_0_ATTR_C FIELD_PREP(CMD_0_ATTR, 0x3)
#define CMD_C1_DATA_LENGTH(v) FIELD_PREP(W1_MASK(63, 48), v)
#define CMD_C1_OFFSET(v) FIELD_PREP(W1_MASK(47, 32), v)
#define CMD_C0_TOC W0_BIT_(31)
#define CMD_C0_ROC W0_BIT_(30)
#define CMD_C0_RNW W0_BIT_(29)
#define CMD_C0_MODE(v) FIELD_PREP(W0_MASK(28, 26), v)
#define CMD_C0_16_BIT_SUBOFFSET W0_BIT_(25)
#define CMD_C0_FIRST_PHASE_MODE W0_BIT_(24)
#define CMD_C0_DATA_LENGTH_POSITION(v) FIELD_PREP(W0_MASK(23, 22), v)
#define CMD_C0_DEV_INDEX(v) FIELD_PREP(W0_MASK(20, 16), v)
#define CMD_C0_CP W0_BIT_(15)
#define CMD_C0_CMD(v) FIELD_PREP(W0_MASK(14, 7), v)
#define CMD_C0_TID(v) FIELD_PREP(W0_MASK( 6, 3), v)
/*
* Internal Control Command
*/
#define CMD_0_ATTR_M FIELD_PREP(CMD_0_ATTR, 0x7)
#define CMD_M1_VENDOR_SPECIFIC W1_MASK(63, 32)
#define CMD_M0_MIPI_RESERVED W0_MASK(31, 12)
#define CMD_M0_MIPI_CMD W0_MASK(11, 8)
#define CMD_M0_VENDOR_INFO_PRESENT W0_BIT_( 7)
#define CMD_M0_TID(v) FIELD_PREP(W0_MASK( 6, 3), v)
/* Data Transfer Speed and Mode */
enum hci_cmd_mode {
MODE_I3C_SDR0 = 0x0,
MODE_I3C_SDR1 = 0x1,
MODE_I3C_SDR2 = 0x2,
MODE_I3C_SDR3 = 0x3,
MODE_I3C_SDR4 = 0x4,
MODE_I3C_HDR_TSx = 0x5,
MODE_I3C_HDR_DDR = 0x6,
MODE_I3C_HDR_BT = 0x7,
MODE_I3C_Fm_FmP = 0x8,
MODE_I2C_Fm = 0x0,
MODE_I2C_FmP = 0x1,
MODE_I2C_UD1 = 0x2,
MODE_I2C_UD2 = 0x3,
MODE_I2C_UD3 = 0x4,
};
static enum hci_cmd_mode get_i3c_mode(struct i3c_hci *hci)
{
struct i3c_bus *bus = i3c_master_get_bus(&hci->master);
if (bus->scl_rate.i3c >= 12500000)
return MODE_I3C_SDR0;
if (bus->scl_rate.i3c > 8000000)
return MODE_I3C_SDR1;
if (bus->scl_rate.i3c > 6000000)
return MODE_I3C_SDR2;
if (bus->scl_rate.i3c > 4000000)
return MODE_I3C_SDR3;
if (bus->scl_rate.i3c > 2000000)
return MODE_I3C_SDR4;
return MODE_I3C_Fm_FmP;
}
static enum hci_cmd_mode get_i2c_mode(struct i3c_hci *hci)
{
struct i3c_bus *bus = i3c_master_get_bus(&hci->master);
if (bus->scl_rate.i2c >= 1000000)
return MODE_I2C_FmP;
return MODE_I2C_Fm;
}
static void fill_data_bytes(struct hci_xfer *xfer, u8 *data,
unsigned int data_len)
{
xfer->cmd_desc[1] = 0;
switch (data_len) {
case 4:
xfer->cmd_desc[1] |= CMD_I1_DATA_BYTE_4(data[3]);
fallthrough;
case 3:
xfer->cmd_desc[1] |= CMD_I1_DATA_BYTE_3(data[2]);
fallthrough;
case 2:
xfer->cmd_desc[1] |= CMD_I1_DATA_BYTE_2(data[1]);
fallthrough;
case 1:
xfer->cmd_desc[1] |= CMD_I1_DATA_BYTE_1(data[0]);
fallthrough;
case 0:
break;
}
/* we consumed all the data with the cmd descriptor */
xfer->data = NULL;
}
static int hci_cmd_v1_prep_ccc(struct i3c_hci *hci,
struct hci_xfer *xfer,
u8 ccc_addr, u8 ccc_cmd, bool raw)
{
unsigned int dat_idx = 0;
enum hci_cmd_mode mode = get_i3c_mode(hci);
u8 *data = xfer->data;
unsigned int data_len = xfer->data_len;
bool rnw = xfer->rnw;
int ret;
/* this should never happen */
if (WARN_ON(raw))
return -EINVAL;
if (ccc_addr != I3C_BROADCAST_ADDR) {
ret = mipi_i3c_hci_dat_v1.get_index(hci, ccc_addr);
if (ret < 0)
return ret;
dat_idx = ret;
}
xfer->cmd_tid = hci_get_tid();
if (!rnw && data_len <= 4) {
/* we use an Immediate Data Transfer Command */
xfer->cmd_desc[0] =
CMD_0_ATTR_I |
CMD_I0_TID(xfer->cmd_tid) |
CMD_I0_CMD(ccc_cmd) | CMD_I0_CP |
CMD_I0_DEV_INDEX(dat_idx) |
CMD_I0_DTT(data_len) |
CMD_I0_MODE(mode);
fill_data_bytes(xfer, data, data_len);
} else {
/* we use a Regular Data Transfer Command */
xfer->cmd_desc[0] =
CMD_0_ATTR_R |
CMD_R0_TID(xfer->cmd_tid) |
CMD_R0_CMD(ccc_cmd) | CMD_R0_CP |
CMD_R0_DEV_INDEX(dat_idx) |
CMD_R0_MODE(mode) |
(rnw ? CMD_R0_RNW : 0);
xfer->cmd_desc[1] =
CMD_R1_DATA_LENGTH(data_len);
}
return 0;
}
static void hci_cmd_v1_prep_i3c_xfer(struct i3c_hci *hci,
struct i3c_dev_desc *dev,
struct hci_xfer *xfer)
{
struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev);
unsigned int dat_idx = dev_data->dat_idx;
enum hci_cmd_mode mode = get_i3c_mode(hci);
u8 *data = xfer->data;
unsigned int data_len = xfer->data_len;
bool rnw = xfer->rnw;
xfer->cmd_tid = hci_get_tid();
if (!rnw && data_len <= 4) {
/* we use an Immediate Data Transfer Command */
xfer->cmd_desc[0] =
CMD_0_ATTR_I |
CMD_I0_TID(xfer->cmd_tid) |
CMD_I0_DEV_INDEX(dat_idx) |
CMD_I0_DTT(data_len) |
CMD_I0_MODE(mode);
fill_data_bytes(xfer, data, data_len);
} else {
/* we use a Regular Data Transfer Command */
xfer->cmd_desc[0] =
CMD_0_ATTR_R |
CMD_R0_TID(xfer->cmd_tid) |
CMD_R0_DEV_INDEX(dat_idx) |
CMD_R0_MODE(mode) |
(rnw ? CMD_R0_RNW : 0);
xfer->cmd_desc[1] =
CMD_R1_DATA_LENGTH(data_len);
}
}
static void hci_cmd_v1_prep_i2c_xfer(struct i3c_hci *hci,
struct i2c_dev_desc *dev,
struct hci_xfer *xfer)
{
struct i3c_hci_dev_data *dev_data = i2c_dev_get_master_data(dev);
unsigned int dat_idx = dev_data->dat_idx;
enum hci_cmd_mode mode = get_i2c_mode(hci);
u8 *data = xfer->data;
unsigned int data_len = xfer->data_len;
bool rnw = xfer->rnw;
xfer->cmd_tid = hci_get_tid();
if (!rnw && data_len <= 4) {
/* we use an Immediate Data Transfer Command */
xfer->cmd_desc[0] =
CMD_0_ATTR_I |
CMD_I0_TID(xfer->cmd_tid) |
CMD_I0_DEV_INDEX(dat_idx) |
CMD_I0_DTT(data_len) |
CMD_I0_MODE(mode);
fill_data_bytes(xfer, data, data_len);
} else {
/* we use a Regular Data Transfer Command */
xfer->cmd_desc[0] =
CMD_0_ATTR_R |
CMD_R0_TID(xfer->cmd_tid) |
CMD_R0_DEV_INDEX(dat_idx) |
CMD_R0_MODE(mode) |
(rnw ? CMD_R0_RNW : 0);
xfer->cmd_desc[1] =
CMD_R1_DATA_LENGTH(data_len);
}
}
static int hci_cmd_v1_daa(struct i3c_hci *hci)
{
struct hci_xfer *xfer;
int ret, dat_idx = -1;
u8 next_addr = 0;
u64 pid;
unsigned int dcr, bcr;
DECLARE_COMPLETION_ONSTACK(done);
xfer = hci_alloc_xfer(2);
if (!xfer)
return -ENOMEM;
/*
* Simple for now: we allocate a temporary DAT entry, do a single
* DAA, register the device which will allocate its own DAT entry
* via the core callback, then free the temporary DAT entry.
* Loop until there is no more devices to assign an address to.
* Yes, there is room for improvements.
*/
for (;;) {
ret = mipi_i3c_hci_dat_v1.alloc_entry(hci);
if (ret < 0)
break;
dat_idx = ret;
ret = i3c_master_get_free_addr(&hci->master, next_addr);
if (ret < 0)
break;
next_addr = ret;
DBG("next_addr = 0x%02x, DAA using DAT %d", next_addr, dat_idx);
mipi_i3c_hci_dat_v1.set_dynamic_addr(hci, dat_idx, next_addr);
mipi_i3c_hci_dct_index_reset(hci);
xfer->cmd_tid = hci_get_tid();
xfer->cmd_desc[0] =
CMD_0_ATTR_A |
CMD_A0_TID(xfer->cmd_tid) |
CMD_A0_CMD(I3C_CCC_ENTDAA) |
CMD_A0_DEV_INDEX(dat_idx) |
CMD_A0_DEV_COUNT(1) |
CMD_A0_ROC | CMD_A0_TOC;
xfer->cmd_desc[1] = 0;
hci->io->queue_xfer(hci, xfer, 1);
if (!wait_for_completion_timeout(&done, HZ) &&
hci->io->dequeue_xfer(hci, xfer, 1)) {
ret = -ETIME;
break;
}
if (RESP_STATUS(xfer[0].response) == RESP_ERR_NACK &&
RESP_STATUS(xfer[0].response) == 1) {
ret = 0; /* no more devices to be assigned */
break;
}
if (RESP_STATUS(xfer[0].response) != RESP_SUCCESS) {
ret = -EIO;
break;
}
i3c_hci_dct_get_val(hci, 0, &pid, &dcr, &bcr);
DBG("assigned address %#x to device PID=0x%llx DCR=%#x BCR=%#x",
next_addr, pid, dcr, bcr);
mipi_i3c_hci_dat_v1.free_entry(hci, dat_idx);
dat_idx = -1;
/*
* TODO: Extend the subsystem layer to allow for registering
* new device and provide BCR/DCR/PID at the same time.
*/
ret = i3c_master_add_i3c_dev_locked(&hci->master, next_addr);
if (ret)
break;
}
if (dat_idx >= 0)
mipi_i3c_hci_dat_v1.free_entry(hci, dat_idx);
hci_free_xfer(xfer, 1);
return ret;
}
const struct hci_cmd_ops mipi_i3c_hci_cmd_v1 = {
.prep_ccc = hci_cmd_v1_prep_ccc,
.prep_i3c_xfer = hci_cmd_v1_prep_i3c_xfer,
.prep_i2c_xfer = hci_cmd_v1_prep_i2c_xfer,
.perform_daa = hci_cmd_v1_daa,
};

316
drivers/i3c/master/mipi-i3c-hci/cmd_v2.c Normal file
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// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* I3C HCI v2.0 Command Descriptor Handling
*
* Note: The I3C HCI v2.0 spec is still in flux. The code here will change.
*/
#include <linux/bitfield.h>
#include <linux/i3c/master.h>
#include "hci.h"
#include "cmd.h"
#include "xfer_mode_rate.h"
/*
* Unified Data Transfer Command
*/
#define CMD_0_ATTR_U FIELD_PREP(CMD_0_ATTR, 0x4)
#define CMD_U3_HDR_TSP_ML_CTRL(v) FIELD_PREP(W3_MASK(107, 104), v)
#define CMD_U3_IDB4(v) FIELD_PREP(W3_MASK(103, 96), v)
#define CMD_U3_HDR_CMD(v) FIELD_PREP(W3_MASK(103, 96), v)
#define CMD_U2_IDB3(v) FIELD_PREP(W2_MASK( 95, 88), v)
#define CMD_U2_HDR_BT(v) FIELD_PREP(W2_MASK( 95, 88), v)
#define CMD_U2_IDB2(v) FIELD_PREP(W2_MASK( 87, 80), v)
#define CMD_U2_BT_CMD2(v) FIELD_PREP(W2_MASK( 87, 80), v)
#define CMD_U2_IDB1(v) FIELD_PREP(W2_MASK( 79, 72), v)
#define CMD_U2_BT_CMD1(v) FIELD_PREP(W2_MASK( 79, 72), v)
#define CMD_U2_IDB0(v) FIELD_PREP(W2_MASK( 71, 64), v)
#define CMD_U2_BT_CMD0(v) FIELD_PREP(W2_MASK( 71, 64), v)
#define CMD_U1_ERR_HANDLING(v) FIELD_PREP(W1_MASK( 63, 62), v)
#define CMD_U1_ADD_FUNC(v) FIELD_PREP(W1_MASK( 61, 56), v)
#define CMD_U1_COMBO_XFER W1_BIT_( 55)
#define CMD_U1_DATA_LENGTH(v) FIELD_PREP(W1_MASK( 53, 32), v)
#define CMD_U0_TOC W0_BIT_( 31)
#define CMD_U0_ROC W0_BIT_( 30)
#define CMD_U0_MAY_YIELD W0_BIT_( 29)
#define CMD_U0_NACK_RCNT(v) FIELD_PREP(W0_MASK( 28, 27), v)
#define CMD_U0_IDB_COUNT(v) FIELD_PREP(W0_MASK( 26, 24), v)
#define CMD_U0_MODE_INDEX(v) FIELD_PREP(W0_MASK( 22, 18), v)
#define CMD_U0_XFER_RATE(v) FIELD_PREP(W0_MASK( 17, 15), v)
#define CMD_U0_DEV_ADDRESS(v) FIELD_PREP(W0_MASK( 14, 8), v)
#define CMD_U0_RnW W0_BIT_( 7)
#define CMD_U0_TID(v) FIELD_PREP(W0_MASK( 6, 3), v)
/*
* Address Assignment Command
*/
#define CMD_0_ATTR_A FIELD_PREP(CMD_0_ATTR, 0x2)
#define CMD_A1_DATA_LENGTH(v) FIELD_PREP(W1_MASK( 53, 32), v)
#define CMD_A0_TOC W0_BIT_( 31)
#define CMD_A0_ROC W0_BIT_( 30)
#define CMD_A0_XFER_RATE(v) FIELD_PREP(W0_MASK( 17, 15), v)
#define CMD_A0_ASSIGN_ADDRESS(v) FIELD_PREP(W0_MASK( 14, 8), v)
#define CMD_A0_TID(v) FIELD_PREP(W0_MASK( 6, 3), v)
static unsigned int get_i3c_rate_idx(struct i3c_hci *hci)
{
struct i3c_bus *bus = i3c_master_get_bus(&hci->master);
if (bus->scl_rate.i3c >= 12000000)
return XFERRATE_I3C_SDR0;
if (bus->scl_rate.i3c > 8000000)
return XFERRATE_I3C_SDR1;
if (bus->scl_rate.i3c > 6000000)
return XFERRATE_I3C_SDR2;
if (bus->scl_rate.i3c > 4000000)
return XFERRATE_I3C_SDR3;
if (bus->scl_rate.i3c > 2000000)
return XFERRATE_I3C_SDR4;
return XFERRATE_I3C_SDR_FM_FMP;
}
static unsigned int get_i2c_rate_idx(struct i3c_hci *hci)
{
struct i3c_bus *bus = i3c_master_get_bus(&hci->master);
if (bus->scl_rate.i2c >= 1000000)
return XFERRATE_I2C_FMP;
return XFERRATE_I2C_FM;
}
static void hci_cmd_v2_prep_private_xfer(struct i3c_hci *hci,
struct hci_xfer *xfer,
u8 addr, unsigned int mode,
unsigned int rate)
{
u8 *data = xfer->data;
unsigned int data_len = xfer->data_len;
bool rnw = xfer->rnw;
xfer->cmd_tid = hci_get_tid();
if (!rnw && data_len <= 5) {
xfer->cmd_desc[0] =
CMD_0_ATTR_U |
CMD_U0_TID(xfer->cmd_tid) |
CMD_U0_DEV_ADDRESS(addr) |
CMD_U0_XFER_RATE(rate) |
CMD_U0_MODE_INDEX(mode) |
CMD_U0_IDB_COUNT(data_len);
xfer->cmd_desc[1] =
CMD_U1_DATA_LENGTH(0);
xfer->cmd_desc[2] = 0;
xfer->cmd_desc[3] = 0;
switch (data_len) {
case 5:
xfer->cmd_desc[3] |= CMD_U3_IDB4(data[4]);
fallthrough;
case 4:
xfer->cmd_desc[2] |= CMD_U2_IDB3(data[3]);
fallthrough;
case 3:
xfer->cmd_desc[2] |= CMD_U2_IDB2(data[2]);
fallthrough;
case 2:
xfer->cmd_desc[2] |= CMD_U2_IDB1(data[1]);
fallthrough;
case 1:
xfer->cmd_desc[2] |= CMD_U2_IDB0(data[0]);
fallthrough;
case 0:
break;
}
/* we consumed all the data with the cmd descriptor */
xfer->data = NULL;
} else {
xfer->cmd_desc[0] =
CMD_0_ATTR_U |
CMD_U0_TID(xfer->cmd_tid) |
(rnw ? CMD_U0_RnW : 0) |
CMD_U0_DEV_ADDRESS(addr) |
CMD_U0_XFER_RATE(rate) |
CMD_U0_MODE_INDEX(mode);
xfer->cmd_desc[1] =
CMD_U1_DATA_LENGTH(data_len);
xfer->cmd_desc[2] = 0;
xfer->cmd_desc[3] = 0;
}
}
static int hci_cmd_v2_prep_ccc(struct i3c_hci *hci, struct hci_xfer *xfer,
u8 ccc_addr, u8 ccc_cmd, bool raw)
{
unsigned int mode = XFERMODE_IDX_I3C_SDR;
unsigned int rate = get_i3c_rate_idx(hci);
u8 *data = xfer->data;
unsigned int data_len = xfer->data_len;
bool rnw = xfer->rnw;
if (raw && ccc_addr != I3C_BROADCAST_ADDR) {
hci_cmd_v2_prep_private_xfer(hci, xfer, ccc_addr, mode, rate);
return 0;
}
xfer->cmd_tid = hci_get_tid();
if (!rnw && data_len <= 4) {
xfer->cmd_desc[0] =
CMD_0_ATTR_U |
CMD_U0_TID(xfer->cmd_tid) |
CMD_U0_DEV_ADDRESS(ccc_addr) |
CMD_U0_XFER_RATE(rate) |
CMD_U0_MODE_INDEX(mode) |
CMD_U0_IDB_COUNT(data_len + (!raw ? 0 : 1));
xfer->cmd_desc[1] =
CMD_U1_DATA_LENGTH(0);
xfer->cmd_desc[2] =
CMD_U2_IDB0(ccc_cmd);
xfer->cmd_desc[3] = 0;
switch (data_len) {
case 4:
xfer->cmd_desc[3] |= CMD_U3_IDB4(data[3]);
fallthrough;
case 3:
xfer->cmd_desc[2] |= CMD_U2_IDB3(data[2]);
fallthrough;
case 2:
xfer->cmd_desc[2] |= CMD_U2_IDB2(data[1]);
fallthrough;
case 1:
xfer->cmd_desc[2] |= CMD_U2_IDB1(data[0]);
fallthrough;
case 0:
break;
}
/* we consumed all the data with the cmd descriptor */
xfer->data = NULL;
} else {
xfer->cmd_desc[0] =
CMD_0_ATTR_U |
CMD_U0_TID(xfer->cmd_tid) |
(rnw ? CMD_U0_RnW : 0) |
CMD_U0_DEV_ADDRESS(ccc_addr) |
CMD_U0_XFER_RATE(rate) |
CMD_U0_MODE_INDEX(mode) |
CMD_U0_IDB_COUNT(!raw ? 0 : 1);
xfer->cmd_desc[1] =
CMD_U1_DATA_LENGTH(data_len);
xfer->cmd_desc[2] =
CMD_U2_IDB0(ccc_cmd);
xfer->cmd_desc[3] = 0;
}
return 0;
}
static void hci_cmd_v2_prep_i3c_xfer(struct i3c_hci *hci,
struct i3c_dev_desc *dev,
struct hci_xfer *xfer)
{
unsigned int mode = XFERMODE_IDX_I3C_SDR;
unsigned int rate = get_i3c_rate_idx(hci);
u8 addr = dev->info.dyn_addr;
hci_cmd_v2_prep_private_xfer(hci, xfer, addr, mode, rate);
}
static void hci_cmd_v2_prep_i2c_xfer(struct i3c_hci *hci,
struct i2c_dev_desc *dev,
struct hci_xfer *xfer)
{
unsigned int mode = XFERMODE_IDX_I2C;
unsigned int rate = get_i2c_rate_idx(hci);
u8 addr = dev->addr;
hci_cmd_v2_prep_private_xfer(hci, xfer, addr, mode, rate);
}
static int hci_cmd_v2_daa(struct i3c_hci *hci)
{
struct hci_xfer *xfer;
int ret;
u8 next_addr = 0;
u32 device_id[2];
u64 pid;
unsigned int dcr, bcr;
DECLARE_COMPLETION_ONSTACK(done);
xfer = hci_alloc_xfer(2);
if (!xfer)
return -ENOMEM;
xfer[0].data = &device_id;
xfer[0].data_len = 8;
xfer[0].rnw = true;
xfer[0].cmd_desc[1] = CMD_A1_DATA_LENGTH(8);
xfer[1].completion = &done;
for (;;) {
ret = i3c_master_get_free_addr(&hci->master, next_addr);
if (ret < 0)
break;
next_addr = ret;
DBG("next_addr = 0x%02x", next_addr);
xfer[0].cmd_tid = hci_get_tid();
xfer[0].cmd_desc[0] =
CMD_0_ATTR_A |
CMD_A0_TID(xfer[0].cmd_tid) |
CMD_A0_ROC;
xfer[1].cmd_tid = hci_get_tid();
xfer[1].cmd_desc[0] =
CMD_0_ATTR_A |
CMD_A0_TID(xfer[1].cmd_tid) |
CMD_A0_ASSIGN_ADDRESS(next_addr) |
CMD_A0_ROC |
CMD_A0_TOC;
hci->io->queue_xfer(hci, xfer, 2);
if (!wait_for_completion_timeout(&done, HZ) &&
hci->io->dequeue_xfer(hci, xfer, 2)) {
ret = -ETIME;
break;
}
if (RESP_STATUS(xfer[0].response) != RESP_SUCCESS) {
ret = 0; /* no more devices to be assigned */
break;
}
if (RESP_STATUS(xfer[1].response) != RESP_SUCCESS) {
ret = -EIO;
break;
}
pid = FIELD_GET(W1_MASK(47, 32), device_id[1]);
pid = (pid << 32) | device_id[0];
bcr = FIELD_GET(W1_MASK(55, 48), device_id[1]);
dcr = FIELD_GET(W1_MASK(63, 56), device_id[1]);
DBG("assigned address %#x to device PID=0x%llx DCR=%#x BCR=%#x",
next_addr, pid, dcr, bcr);
/*
* TODO: Extend the subsystem layer to allow for registering
* new device and provide BCR/DCR/PID at the same time.
*/
ret = i3c_master_add_i3c_dev_locked(&hci->master, next_addr);
if (ret)
break;
}
hci_free_xfer(xfer, 2);
return ret;
}
const struct hci_cmd_ops mipi_i3c_hci_cmd_v2 = {
.prep_ccc = hci_cmd_v2_prep_ccc,
.prep_i3c_xfer = hci_cmd_v2_prep_i3c_xfer,
.prep_i2c_xfer = hci_cmd_v2_prep_i2c_xfer,
.perform_daa = hci_cmd_v2_daa,
};

798
drivers/i3c/master/mipi-i3c-hci/core.c Normal file
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// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* Core driver code with main interface to the I3C subsystem.
*/
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/i3c/master.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include "hci.h"
#include "ext_caps.h"
#include "cmd.h"
#include "dat.h"
/*
* Host Controller Capabilities and Operation Registers
*/
#define reg_read(r) readl(hci->base_regs + (r))
#define reg_write(r, v) writel(v, hci->base_regs + (r))
#define reg_set(r, v) reg_write(r, reg_read(r) | (v))
#define reg_clear(r, v) reg_write(r, reg_read(r) & ~(v))
#define HCI_VERSION 0x00 /* HCI Version (in BCD) */
#define HC_CONTROL 0x04
#define HC_CONTROL_BUS_ENABLE BIT(31)
#define HC_CONTROL_RESUME BIT(30)
#define HC_CONTROL_ABORT BIT(29)
#define HC_CONTROL_HALT_ON_CMD_TIMEOUT BIT(12)
#define HC_CONTROL_HOT_JOIN_CTRL BIT(8) /* Hot-Join ACK/NACK Control */
#define HC_CONTROL_I2C_TARGET_PRESENT BIT(7)
#define HC_CONTROL_PIO_MODE BIT(6) /* DMA/PIO Mode Selector */
#define HC_CONTROL_DATA_BIG_ENDIAN BIT(4)
#define HC_CONTROL_IBA_INCLUDE BIT(0) /* Include I3C Broadcast Address */
#define MASTER_DEVICE_ADDR 0x08 /* Master Device Address */
#define MASTER_DYNAMIC_ADDR_VALID BIT(31) /* Dynamic Address is Valid */
#define MASTER_DYNAMIC_ADDR(v) FIELD_PREP(GENMASK(22, 16), v)
#define HC_CAPABILITIES 0x0c
#define HC_CAP_SG_DC_EN BIT(30)
#define HC_CAP_SG_IBI_EN BIT(29)
#define HC_CAP_SG_CR_EN BIT(28)
#define HC_CAP_MAX_DATA_LENGTH GENMASK(24, 22)
#define HC_CAP_CMD_SIZE GENMASK(21, 20)
#define HC_CAP_DIRECT_COMMANDS_EN BIT(18)
#define HC_CAP_MULTI_LANE_EN BIT(15)
#define HC_CAP_CMD_CCC_DEFBYTE BIT(10)
#define HC_CAP_HDR_BT_EN BIT(8)
#define HC_CAP_HDR_TS_EN BIT(7)
#define HC_CAP_HDR_DDR_EN BIT(6)
#define HC_CAP_NON_CURRENT_MASTER_CAP BIT(5) /* master handoff capable */
#define HC_CAP_DATA_BYTE_CFG_EN BIT(4) /* endian selection possible */
#define HC_CAP_AUTO_COMMAND BIT(3)
#define HC_CAP_COMBO_COMMAND BIT(2)
#define RESET_CONTROL 0x10
#define BUS_RESET BIT(31)
#define BUS_RESET_TYPE GENMASK(30, 29)
#define IBI_QUEUE_RST BIT(5)
#define RX_FIFO_RST BIT(4)
#define TX_FIFO_RST BIT(3)
#define RESP_QUEUE_RST BIT(2)
#define CMD_QUEUE_RST BIT(1)
#define SOFT_RST BIT(0) /* Core Reset */
#define PRESENT_STATE 0x14
#define STATE_CURRENT_MASTER BIT(2)
#define INTR_STATUS 0x20
#define INTR_STATUS_ENABLE 0x24
#define INTR_SIGNAL_ENABLE 0x28
#define INTR_FORCE 0x2c
#define INTR_HC_CMD_SEQ_UFLOW_STAT BIT(12) /* Cmd Sequence Underflow */
#define INTR_HC_RESET_CANCEL BIT(11) /* HC Cancelled Reset */
#define INTR_HC_INTERNAL_ERR BIT(10) /* HC Internal Error */
#define INTR_HC_PIO BIT(8) /* cascaded PIO interrupt */
#define INTR_HC_RINGS GENMASK(7, 0)
#define DAT_SECTION 0x30 /* Device Address Table */
#define DAT_ENTRY_SIZE GENMASK(31, 28)
#define DAT_TABLE_SIZE GENMASK(18, 12)
#define DAT_TABLE_OFFSET GENMASK(11, 0)
#define DCT_SECTION 0x34 /* Device Characteristics Table */
#define DCT_ENTRY_SIZE GENMASK(31, 28)
#define DCT_TABLE_INDEX GENMASK(23, 19)
#define DCT_TABLE_SIZE GENMASK(18, 12)
#define DCT_TABLE_OFFSET GENMASK(11, 0)
#define RING_HEADERS_SECTION 0x38
#define RING_HEADERS_OFFSET GENMASK(15, 0)
#define PIO_SECTION 0x3c
#define PIO_REGS_OFFSET GENMASK(15, 0) /* PIO Offset */
#define EXT_CAPS_SECTION 0x40
#define EXT_CAPS_OFFSET GENMASK(15, 0)
#define IBI_NOTIFY_CTRL 0x58 /* IBI Notify Control */
#define IBI_NOTIFY_SIR_REJECTED BIT(3) /* Rejected Target Interrupt Request */
#define IBI_NOTIFY_MR_REJECTED BIT(1) /* Rejected Master Request Control */
#define IBI_NOTIFY_HJ_REJECTED BIT(0) /* Rejected Hot-Join Control */
#define DEV_CTX_BASE_LO 0x60
#define DEV_CTX_BASE_HI 0x64
static inline struct i3c_hci *to_i3c_hci(struct i3c_master_controller *m)
{
return container_of(m, struct i3c_hci, master);
}
static int i3c_hci_bus_init(struct i3c_master_controller *m)
{
struct i3c_hci *hci = to_i3c_hci(m);
struct i3c_device_info info;
int ret;
DBG("");
if (hci->cmd == &mipi_i3c_hci_cmd_v1) {
ret = mipi_i3c_hci_dat_v1.init(hci);
if (ret)
return ret;
}
ret = i3c_master_get_free_addr(m, 0);
if (ret < 0)
return ret;
reg_write(MASTER_DEVICE_ADDR,
MASTER_DYNAMIC_ADDR(ret) | MASTER_DYNAMIC_ADDR_VALID);
memset(&info, 0, sizeof(info));
info.dyn_addr = ret;
ret = i3c_master_set_info(m, &info);
if (ret)
return ret;
ret = hci->io->init(hci);
if (ret)
return ret;
reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE);
DBG("HC_CONTROL = %#x", reg_read(HC_CONTROL));
return 0;
}
static void i3c_hci_bus_cleanup(struct i3c_master_controller *m)
{
struct i3c_hci *hci = to_i3c_hci(m);
DBG("");
reg_clear(HC_CONTROL, HC_CONTROL_BUS_ENABLE);
hci->io->cleanup(hci);
if (hci->cmd == &mipi_i3c_hci_cmd_v1)
mipi_i3c_hci_dat_v1.cleanup(hci);
}
void mipi_i3c_hci_resume(struct i3c_hci *hci)
{
/* the HC_CONTROL_RESUME bit is R/W1C so just read and write back */
reg_write(HC_CONTROL, reg_read(HC_CONTROL));
}
/* located here rather than pio.c because needed bits are in core reg space */
void mipi_i3c_hci_pio_reset(struct i3c_hci *hci)
{
reg_write(RESET_CONTROL, RX_FIFO_RST | TX_FIFO_RST | RESP_QUEUE_RST);
}
/* located here rather than dct.c because needed bits are in core reg space */
void mipi_i3c_hci_dct_index_reset(struct i3c_hci *hci)
{
reg_write(DCT_SECTION, FIELD_PREP(DCT_TABLE_INDEX, 0));
}
static int i3c_hci_send_ccc_cmd(struct i3c_master_controller *m,
struct i3c_ccc_cmd *ccc)
{
struct i3c_hci *hci = to_i3c_hci(m);
struct hci_xfer *xfer;
bool raw = !!(hci->quirks & HCI_QUIRK_RAW_CCC);
bool prefixed = raw && !!(ccc->id & I3C_CCC_DIRECT);
unsigned int nxfers = ccc->ndests + prefixed;
DECLARE_COMPLETION_ONSTACK(done);
int i, last, ret = 0;
DBG("cmd=%#x rnw=%d ndests=%d data[0].len=%d",
ccc->id, ccc->rnw, ccc->ndests, ccc->dests[0].payload.len);
xfer = hci_alloc_xfer(nxfers);
if (!xfer)
return -ENOMEM;
if (prefixed) {
xfer->data = NULL;
xfer->data_len = 0;
xfer->rnw = false;
hci->cmd->prep_ccc(hci, xfer, I3C_BROADCAST_ADDR,
ccc->id, true);
xfer++;
}
for (i = 0; i < nxfers - prefixed; i++) {
xfer[i].data = ccc->dests[i].payload.data;
xfer[i].data_len = ccc->dests[i].payload.len;
xfer[i].rnw = ccc->rnw;
ret = hci->cmd->prep_ccc(hci, &xfer[i], ccc->dests[i].addr,
ccc->id, raw);
if (ret)
goto out;
xfer[i].cmd_desc[0] |= CMD_0_ROC;
}
last = i - 1;
xfer[last].cmd_desc[0] |= CMD_0_TOC;
xfer[last].completion = &done;
if (prefixed)
xfer--;
ret = hci->io->queue_xfer(hci, xfer, nxfers);
if (ret)
goto out;
if (!wait_for_completion_timeout(&done, HZ) &&
hci->io->dequeue_xfer(hci, xfer, nxfers)) {
ret = -ETIME;
goto out;
}
for (i = prefixed; i < nxfers; i++) {
if (ccc->rnw)
ccc->dests[i - prefixed].payload.len =
RESP_DATA_LENGTH(xfer[i].response);
if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) {
ret = -EIO;
goto out;
}
}
if (ccc->rnw)
DBG("got: %*ph",
ccc->dests[0].payload.len, ccc->dests[0].payload.data);
out:
hci_free_xfer(xfer, nxfers);
return ret;
}
static int i3c_hci_daa(struct i3c_master_controller *m)
{
struct i3c_hci *hci = to_i3c_hci(m);
DBG("");
return hci->cmd->perform_daa(hci);
}
static int i3c_hci_priv_xfers(struct i3c_dev_desc *dev,
struct i3c_priv_xfer *i3c_xfers,
int nxfers)
{
struct i3c_master_controller *m = i3c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct hci_xfer *xfer;
DECLARE_COMPLETION_ONSTACK(done);
unsigned int size_limit;
int i, last, ret = 0;
DBG("nxfers = %d", nxfers);
xfer = hci_alloc_xfer(nxfers);
if (!xfer)
return -ENOMEM;
size_limit = 1U << (16 + FIELD_GET(HC_CAP_MAX_DATA_LENGTH, hci->caps));
for (i = 0; i < nxfers; i++) {
xfer[i].data_len = i3c_xfers[i].len;
ret = -EFBIG;
if (xfer[i].data_len >= size_limit)
goto out;
xfer[i].rnw = i3c_xfers[i].rnw;
if (i3c_xfers[i].rnw) {
xfer[i].data = i3c_xfers[i].data.in;
} else {
/* silence the const qualifier warning with a cast */
xfer[i].data = (void *) i3c_xfers[i].data.out;
}
hci->cmd->prep_i3c_xfer(hci, dev, &xfer[i]);
xfer[i].cmd_desc[0] |= CMD_0_ROC;
}
last = i - 1;
xfer[last].cmd_desc[0] |= CMD_0_TOC;
xfer[last].completion = &done;
ret = hci->io->queue_xfer(hci, xfer, nxfers);
if (ret)
goto out;
if (!wait_for_completion_timeout(&done, HZ) &&
hci->io->dequeue_xfer(hci, xfer, nxfers)) {
ret = -ETIME;
goto out;
}
for (i = 0; i < nxfers; i++) {
if (i3c_xfers[i].rnw)
i3c_xfers[i].len = RESP_DATA_LENGTH(xfer[i].response);
if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) {
ret = -EIO;
goto out;
}
}
out:
hci_free_xfer(xfer, nxfers);
return ret;
}
static int i3c_hci_i2c_xfers(struct i2c_dev_desc *dev,
const struct i2c_msg *i2c_xfers, int nxfers)
{
struct i3c_master_controller *m = i2c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct hci_xfer *xfer;
DECLARE_COMPLETION_ONSTACK(done);
int i, last, ret = 0;
DBG("nxfers = %d", nxfers);
xfer = hci_alloc_xfer(nxfers);
if (!xfer)
return -ENOMEM;
for (i = 0; i < nxfers; i++) {
xfer[i].data = i2c_xfers[i].buf;
xfer[i].data_len = i2c_xfers[i].len;
xfer[i].rnw = i2c_xfers[i].flags & I2C_M_RD;
hci->cmd->prep_i2c_xfer(hci, dev, &xfer[i]);
xfer[i].cmd_desc[0] |= CMD_0_ROC;
}
last = i - 1;
xfer[last].cmd_desc[0] |= CMD_0_TOC;
xfer[last].completion = &done;
ret = hci->io->queue_xfer(hci, xfer, nxfers);
if (ret)
goto out;
if (!wait_for_completion_timeout(&done, HZ) &&
hci->io->dequeue_xfer(hci, xfer, nxfers)) {
ret = -ETIME;
goto out;
}
for (i = 0; i < nxfers; i++) {
if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) {
ret = -EIO;
goto out;
}
}
out:
hci_free_xfer(xfer, nxfers);
return ret;
}
static int i3c_hci_attach_i3c_dev(struct i3c_dev_desc *dev)
{
struct i3c_master_controller *m = i3c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct i3c_hci_dev_data *dev_data;
int ret;
DBG("");
dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
if (!dev_data)
return -ENOMEM;
if (hci->cmd == &mipi_i3c_hci_cmd_v1) {
ret = mipi_i3c_hci_dat_v1.alloc_entry(hci);
if (ret < 0) {
kfree(dev_data);
return ret;
}
mipi_i3c_hci_dat_v1.set_dynamic_addr(hci, ret, dev->info.dyn_addr);
dev_data->dat_idx = ret;
}
i3c_dev_set_master_data(dev, dev_data);
return 0;
}
static int i3c_hci_reattach_i3c_dev(struct i3c_dev_desc *dev, u8 old_dyn_addr)
{
struct i3c_master_controller *m = i3c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev);
DBG("");
if (hci->cmd == &mipi_i3c_hci_cmd_v1)
mipi_i3c_hci_dat_v1.set_dynamic_addr(hci, dev_data->dat_idx,
dev->info.dyn_addr);
return 0;
}
static void i3c_hci_detach_i3c_dev(struct i3c_dev_desc *dev)
{
struct i3c_master_controller *m = i3c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev);
DBG("");
i3c_dev_set_master_data(dev, NULL);
if (hci->cmd == &mipi_i3c_hci_cmd_v1)
mipi_i3c_hci_dat_v1.free_entry(hci, dev_data->dat_idx);
kfree(dev_data);
}
static int i3c_hci_attach_i2c_dev(struct i2c_dev_desc *dev)
{
struct i3c_master_controller *m = i2c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct i3c_hci_dev_data *dev_data;
int ret;
DBG("");
if (hci->cmd != &mipi_i3c_hci_cmd_v1)
return 0;
dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
if (!dev_data)
return -ENOMEM;
ret = mipi_i3c_hci_dat_v1.alloc_entry(hci);
if (ret < 0) {
kfree(dev_data);
return ret;
}
mipi_i3c_hci_dat_v1.set_static_addr(hci, ret, dev->addr);
mipi_i3c_hci_dat_v1.set_flags(hci, ret, DAT_0_I2C_DEVICE, 0);
dev_data->dat_idx = ret;
i2c_dev_set_master_data(dev, dev_data);
return 0;
}
static void i3c_hci_detach_i2c_dev(struct i2c_dev_desc *dev)
{
struct i3c_master_controller *m = i2c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct i3c_hci_dev_data *dev_data = i2c_dev_get_master_data(dev);
DBG("");
if (dev_data) {
i2c_dev_set_master_data(dev, NULL);
if (hci->cmd == &mipi_i3c_hci_cmd_v1)
mipi_i3c_hci_dat_v1.free_entry(hci, dev_data->dat_idx);
kfree(dev_data);
}
}
static int i3c_hci_request_ibi(struct i3c_dev_desc *dev,
const struct i3c_ibi_setup *req)
{
struct i3c_master_controller *m = i3c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev);
unsigned int dat_idx = dev_data->dat_idx;
if (req->max_payload_len != 0)
mipi_i3c_hci_dat_v1.set_flags(hci, dat_idx, DAT_0_IBI_PAYLOAD, 0);
else
mipi_i3c_hci_dat_v1.clear_flags(hci, dat_idx, DAT_0_IBI_PAYLOAD, 0);
return hci->io->request_ibi(hci, dev, req);
}
static void i3c_hci_free_ibi(struct i3c_dev_desc *dev)
{
struct i3c_master_controller *m = i3c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
hci->io->free_ibi(hci, dev);
}
static int i3c_hci_enable_ibi(struct i3c_dev_desc *dev)
{
struct i3c_master_controller *m = i3c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev);
mipi_i3c_hci_dat_v1.clear_flags(hci, dev_data->dat_idx, DAT_0_SIR_REJECT, 0);
return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
}
static int i3c_hci_disable_ibi(struct i3c_dev_desc *dev)
{
struct i3c_master_controller *m = i3c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev);
mipi_i3c_hci_dat_v1.set_flags(hci, dev_data->dat_idx, DAT_0_SIR_REJECT, 0);
return i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
}
static void i3c_hci_recycle_ibi_slot(struct i3c_dev_desc *dev,
struct i3c_ibi_slot *slot)
{
struct i3c_master_controller *m = i3c_dev_get_master(dev);
struct i3c_hci *hci = to_i3c_hci(m);
hci->io->recycle_ibi_slot(hci, dev, slot);
}
static const struct i3c_master_controller_ops i3c_hci_ops = {
.bus_init = i3c_hci_bus_init,
.bus_cleanup = i3c_hci_bus_cleanup,
.do_daa = i3c_hci_daa,
.send_ccc_cmd = i3c_hci_send_ccc_cmd,
.priv_xfers = i3c_hci_priv_xfers,
.i2c_xfers = i3c_hci_i2c_xfers,
.attach_i3c_dev = i3c_hci_attach_i3c_dev,
.reattach_i3c_dev = i3c_hci_reattach_i3c_dev,
.detach_i3c_dev = i3c_hci_detach_i3c_dev,
.attach_i2c_dev = i3c_hci_attach_i2c_dev,
.detach_i2c_dev = i3c_hci_detach_i2c_dev,
.request_ibi = i3c_hci_request_ibi,
.free_ibi = i3c_hci_free_ibi,
.enable_ibi = i3c_hci_enable_ibi,
.disable_ibi = i3c_hci_disable_ibi,
.recycle_ibi_slot = i3c_hci_recycle_ibi_slot,
};
static irqreturn_t i3c_hci_irq_handler(int irq, void *dev_id)
{
struct i3c_hci *hci = dev_id;
irqreturn_t result = IRQ_NONE;
u32 val;
val = reg_read(INTR_STATUS);
DBG("INTR_STATUS = %#x", val);
if (val) {
reg_write(INTR_STATUS, val);
} else {
/* v1.0 does not have PIO cascaded notification bits */
val |= INTR_HC_PIO;
}
if (val & INTR_HC_RESET_CANCEL) {
DBG("cancelled reset");
val &= ~INTR_HC_RESET_CANCEL;
}
if (val & INTR_HC_INTERNAL_ERR) {
dev_err(&hci->master.dev, "Host Controller Internal Error\n");
val &= ~INTR_HC_INTERNAL_ERR;
}
if (val & INTR_HC_PIO) {
hci->io->irq_handler(hci, 0);
val &= ~INTR_HC_PIO;
}
if (val & INTR_HC_RINGS) {
hci->io->irq_handler(hci, val & INTR_HC_RINGS);
val &= ~INTR_HC_RINGS;
}
if (val)
dev_err(&hci->master.dev, "unexpected INTR_STATUS %#x\n", val);
else
result = IRQ_HANDLED;
return result;
}
static int i3c_hci_init(struct i3c_hci *hci)
{
u32 regval, offset;
int ret;
/* Validate HCI hardware version */
regval = reg_read(HCI_VERSION);
hci->version_major = (regval >> 8) & 0xf;
hci->version_minor = (regval >> 4) & 0xf;
hci->revision = regval & 0xf;
dev_notice(&hci->master.dev, "MIPI I3C HCI v%u.%u r%02u\n",
hci->version_major, hci->version_minor, hci->revision);
/* known versions */
switch (regval & ~0xf) {
case 0x100: /* version 1.0 */
case 0x110: /* version 1.1 */
case 0x200: /* version 2.0 */
break;
default:
dev_err(&hci->master.dev, "unsupported HCI version\n");
return -EPROTONOSUPPORT;
}
hci->caps = reg_read(HC_CAPABILITIES);
DBG("caps = %#x", hci->caps);
regval = reg_read(DAT_SECTION);
offset = FIELD_GET(DAT_TABLE_OFFSET, regval);
hci->DAT_regs = offset ? hci->base_regs + offset : NULL;
hci->DAT_entries = FIELD_GET(DAT_TABLE_SIZE, regval);
hci->DAT_entry_size = FIELD_GET(DAT_ENTRY_SIZE, regval);
dev_info(&hci->master.dev, "DAT: %u %u-bytes entries at offset %#x\n",
hci->DAT_entries, hci->DAT_entry_size * 4, offset);
regval = reg_read(DCT_SECTION);
offset = FIELD_GET(DCT_TABLE_OFFSET, regval);
hci->DCT_regs = offset ? hci->base_regs + offset : NULL;
hci->DCT_entries = FIELD_GET(DCT_TABLE_SIZE, regval);
hci->DCT_entry_size = FIELD_GET(DCT_ENTRY_SIZE, regval);
dev_info(&hci->master.dev, "DCT: %u %u-bytes entries at offset %#x\n",
hci->DCT_entries, hci->DCT_entry_size * 4, offset);
regval = reg_read(RING_HEADERS_SECTION);
offset = FIELD_GET(RING_HEADERS_OFFSET, regval);
hci->RHS_regs = offset ? hci->base_regs + offset : NULL;
dev_info(&hci->master.dev, "Ring Headers at offset %#x\n", offset);
regval = reg_read(PIO_SECTION);
offset = FIELD_GET(PIO_REGS_OFFSET, regval);
hci->PIO_regs = offset ? hci->base_regs + offset : NULL;
dev_info(&hci->master.dev, "PIO section at offset %#x\n", offset);
regval = reg_read(EXT_CAPS_SECTION);
offset = FIELD_GET(EXT_CAPS_OFFSET, regval);
hci->EXTCAPS_regs = offset ? hci->base_regs + offset : NULL;
dev_info(&hci->master.dev, "Extended Caps at offset %#x\n", offset);
ret = i3c_hci_parse_ext_caps(hci);
if (ret)
return ret;
/*
* Now let's reset the hardware.
* SOFT_RST must be clear before we write to it.
* Then we must wait until it clears again.
*/
ret = readx_poll_timeout(reg_read, RESET_CONTROL, regval,
!(regval & SOFT_RST), 1, 10000);
if (ret)
return -ENXIO;
reg_write(RESET_CONTROL, SOFT_RST);
ret = readx_poll_timeout(reg_read, RESET_CONTROL, regval,
!(regval & SOFT_RST), 1, 10000);
if (ret)
return -ENXIO;
/* Disable all interrupts and allow all signal updates */
reg_write(INTR_SIGNAL_ENABLE, 0x0);
reg_write(INTR_STATUS_ENABLE, 0xffffffff);
/* Make sure our data ordering fits the host's */
regval = reg_read(HC_CONTROL);
if (IS_ENABLED(CONFIG_BIG_ENDIAN)) {
if (!(regval & HC_CONTROL_DATA_BIG_ENDIAN)) {
regval |= HC_CONTROL_DATA_BIG_ENDIAN;
reg_write(HC_CONTROL, regval);
regval = reg_read(HC_CONTROL);
if (!(regval & HC_CONTROL_DATA_BIG_ENDIAN)) {
dev_err(&hci->master.dev, "cannot set BE mode\n");
return -EOPNOTSUPP;
}
}
} else {
if (regval & HC_CONTROL_DATA_BIG_ENDIAN) {
regval &= ~HC_CONTROL_DATA_BIG_ENDIAN;
reg_write(HC_CONTROL, regval);
regval = reg_read(HC_CONTROL);
if (regval & HC_CONTROL_DATA_BIG_ENDIAN) {
dev_err(&hci->master.dev, "cannot clear BE mode\n");
return -EOPNOTSUPP;
}
}
}
/* Select our command descriptor model */
switch (FIELD_GET(HC_CAP_CMD_SIZE, hci->caps)) {
case 0:
hci->cmd = &mipi_i3c_hci_cmd_v1;
break;
case 1:
hci->cmd = &mipi_i3c_hci_cmd_v2;
break;
default:
dev_err(&hci->master.dev, "wrong CMD_SIZE capability value\n");
return -EINVAL;
}
/* Try activating DMA operations first */
if (hci->RHS_regs) {
reg_clear(HC_CONTROL, HC_CONTROL_PIO_MODE);
if (reg_read(HC_CONTROL) & HC_CONTROL_PIO_MODE) {
dev_err(&hci->master.dev, "PIO mode is stuck\n");
ret = -EIO;
} else {
hci->io = &mipi_i3c_hci_dma;
dev_info(&hci->master.dev, "Using DMA\n");
}
}
/* If no DMA, try PIO */
if (!hci->io && hci->PIO_regs) {
reg_set(HC_CONTROL, HC_CONTROL_PIO_MODE);
if (!(reg_read(HC_CONTROL) & HC_CONTROL_PIO_MODE)) {
dev_err(&hci->master.dev, "DMA mode is stuck\n");
ret = -EIO;
} else {
hci->io = &mipi_i3c_hci_pio;
dev_info(&hci->master.dev, "Using PIO\n");
}
}
if (!hci->io) {
dev_err(&hci->master.dev, "neither DMA nor PIO can be used\n");
if (!ret)
ret = -EINVAL;
return ret;
}
return 0;
}
static int i3c_hci_probe(struct platform_device *pdev)
{
struct i3c_hci *hci;
int irq, ret;
hci = devm_kzalloc(&pdev->dev, sizeof(*hci), GFP_KERNEL);
if (!hci)
return -ENOMEM;
hci->base_regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(hci->base_regs))
return PTR_ERR(hci->base_regs);
platform_set_drvdata(pdev, hci);
/* temporary for dev_printk's, to be replaced in i3c_master_register */
hci->master.dev.init_name = dev_name(&pdev->dev);
ret = i3c_hci_init(hci);
if (ret)
return ret;
irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(&pdev->dev, irq, i3c_hci_irq_handler,
0, NULL, hci);
if (ret)
return ret;
ret = i3c_master_register(&hci->master, &pdev->dev,
&i3c_hci_ops, false);
if (ret)
return ret;
return 0;
}
static int i3c_hci_remove(struct platform_device *pdev)
{
struct i3c_hci *hci = platform_get_drvdata(pdev);
int ret;
ret = i3c_master_unregister(&hci->master);
if (ret)
return ret;
return 0;
}
static const struct __maybe_unused of_device_id i3c_hci_of_match[] = {
{ .compatible = "mipi-i3c-hci", },
{},
};
MODULE_DEVICE_TABLE(of, i3c_hci_of_match);
static struct platform_driver i3c_hci_driver = {
.probe = i3c_hci_probe,
.remove = i3c_hci_remove,
.driver = {
.name = "mipi-i3c-hci",
.of_match_table = of_match_ptr(i3c_hci_of_match),
},
};
module_platform_driver(i3c_hci_driver);
MODULE_AUTHOR("Nicolas Pitre <npitre@baylibre.com>");
MODULE_DESCRIPTION("MIPI I3C HCI driver");
MODULE_LICENSE("Dual BSD/GPL");

32
drivers/i3c/master/mipi-i3c-hci/dat.h Normal file
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* Common DAT related stuff
*/
#ifndef DAT_H
#define DAT_H
/* Global DAT flags */
#define DAT_0_I2C_DEVICE W0_BIT_(31)
#define DAT_0_SIR_REJECT W0_BIT_(13)
#define DAT_0_IBI_PAYLOAD W0_BIT_(12)
struct hci_dat_ops {
int (*init)(struct i3c_hci *hci);
void (*cleanup)(struct i3c_hci *hci);
int (*alloc_entry)(struct i3c_hci *hci);
void (*free_entry)(struct i3c_hci *hci, unsigned int dat_idx);
void (*set_dynamic_addr)(struct i3c_hci *hci, unsigned int dat_idx, u8 addr);
void (*set_static_addr)(struct i3c_hci *hci, unsigned int dat_idx, u8 addr);
void (*set_flags)(struct i3c_hci *hci, unsigned int dat_idx, u32 w0, u32 w1);
void (*clear_flags)(struct i3c_hci *hci, unsigned int dat_idx, u32 w0, u32 w1);
int (*get_index)(struct i3c_hci *hci, u8 address);
};
extern const struct hci_dat_ops mipi_i3c_hci_dat_v1;
#endif

184
drivers/i3c/master/mipi-i3c-hci/dat_v1.c Normal file
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// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*/
#include <linux/bitfield.h>
#include <linux/bitmap.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/i3c/master.h>
#include <linux/io.h>
#include "hci.h"
#include "dat.h"
/*
* Device Address Table Structure
*/
#define DAT_1_AUTOCMD_HDR_CODE W1_MASK(58, 51)
#define DAT_1_AUTOCMD_MODE W1_MASK(50, 48)
#define DAT_1_AUTOCMD_VALUE W1_MASK(47, 40)
#define DAT_1_AUTOCMD_MASK W1_MASK(39, 32)
/* DAT_0_I2C_DEVICE W0_BIT_(31) */
#define DAT_0_DEV_NACK_RETRY_CNT W0_MASK(30, 29)
#define DAT_0_RING_ID W0_MASK(28, 26)
#define DAT_0_DYNADDR_PARITY W0_BIT_(23)
#define DAT_0_DYNAMIC_ADDRESS W0_MASK(22, 16)
#define DAT_0_TS W0_BIT_(15)
#define DAT_0_MR_REJECT W0_BIT_(14)
/* DAT_0_SIR_REJECT W0_BIT_(13) */
/* DAT_0_IBI_PAYLOAD W0_BIT_(12) */
#define DAT_0_STATIC_ADDRESS W0_MASK(6, 0)
#define dat_w0_read(i) readl(hci->DAT_regs + (i) * 8)
#define dat_w1_read(i) readl(hci->DAT_regs + (i) * 8 + 4)
#define dat_w0_write(i, v) writel(v, hci->DAT_regs + (i) * 8)
#define dat_w1_write(i, v) writel(v, hci->DAT_regs + (i) * 8 + 4)
static inline bool dynaddr_parity(unsigned int addr)
{
addr |= 1 << 7;
addr += addr >> 4;
addr += addr >> 2;
addr += addr >> 1;
return (addr & 1);
}
static int hci_dat_v1_init(struct i3c_hci *hci)
{
unsigned int dat_idx;
if (!hci->DAT_regs) {
dev_err(&hci->master.dev,
"only DAT in register space is supported at the moment\n");
return -EOPNOTSUPP;
}
if (hci->DAT_entry_size != 8) {
dev_err(&hci->master.dev,
"only 8-bytes DAT entries are supported at the moment\n");
return -EOPNOTSUPP;
}
/* use a bitmap for faster free slot search */
hci->DAT_data = bitmap_zalloc(hci->DAT_entries, GFP_KERNEL);
if (!hci->DAT_data)
return -ENOMEM;
/* clear them */
for (dat_idx = 0; dat_idx < hci->DAT_entries; dat_idx++) {
dat_w0_write(dat_idx, 0);
dat_w1_write(dat_idx, 0);
}
return 0;
}
static void hci_dat_v1_cleanup(struct i3c_hci *hci)
{
bitmap_free(hci->DAT_data);
hci->DAT_data = NULL;
}
static int hci_dat_v1_alloc_entry(struct i3c_hci *hci)
{
unsigned int dat_idx;
dat_idx = find_first_zero_bit(hci->DAT_data, hci->DAT_entries);
if (dat_idx >= hci->DAT_entries)
return -ENOENT;
__set_bit(dat_idx, hci->DAT_data);
/* default flags */
dat_w0_write(dat_idx, DAT_0_SIR_REJECT | DAT_0_MR_REJECT);
return dat_idx;
}
static void hci_dat_v1_free_entry(struct i3c_hci *hci, unsigned int dat_idx)
{
dat_w0_write(dat_idx, 0);
dat_w1_write(dat_idx, 0);
__clear_bit(dat_idx, hci->DAT_data);
}
static void hci_dat_v1_set_dynamic_addr(struct i3c_hci *hci,
unsigned int dat_idx, u8 address)
{
u32 dat_w0;
dat_w0 = dat_w0_read(dat_idx);
dat_w0 &= ~(DAT_0_DYNAMIC_ADDRESS | DAT_0_DYNADDR_PARITY);
dat_w0 |= FIELD_PREP(DAT_0_DYNAMIC_ADDRESS, address) |
(dynaddr_parity(address) ? DAT_0_DYNADDR_PARITY : 0);
dat_w0_write(dat_idx, dat_w0);
}
static void hci_dat_v1_set_static_addr(struct i3c_hci *hci,
unsigned int dat_idx, u8 address)
{
u32 dat_w0;
dat_w0 = dat_w0_read(dat_idx);
dat_w0 &= ~DAT_0_STATIC_ADDRESS;
dat_w0 |= FIELD_PREP(DAT_0_STATIC_ADDRESS, address);
dat_w0_write(dat_idx, dat_w0);
}
static void hci_dat_v1_set_flags(struct i3c_hci *hci, unsigned int dat_idx,
u32 w0_flags, u32 w1_flags)
{
u32 dat_w0, dat_w1;
dat_w0 = dat_w0_read(dat_idx);
dat_w1 = dat_w1_read(dat_idx);
dat_w0 |= w0_flags;
dat_w1 |= w1_flags;
dat_w0_write(dat_idx, dat_w0);
dat_w1_write(dat_idx, dat_w1);
}
static void hci_dat_v1_clear_flags(struct i3c_hci *hci, unsigned int dat_idx,
u32 w0_flags, u32 w1_flags)
{
u32 dat_w0, dat_w1;
dat_w0 = dat_w0_read(dat_idx);
dat_w1 = dat_w1_read(dat_idx);
dat_w0 &= ~w0_flags;
dat_w1 &= ~w1_flags;
dat_w0_write(dat_idx, dat_w0);
dat_w1_write(dat_idx, dat_w1);
}
static int hci_dat_v1_get_index(struct i3c_hci *hci, u8 dev_addr)
{
unsigned int dat_idx;
u32 dat_w0;
for (dat_idx = find_first_bit(hci->DAT_data, hci->DAT_entries);
dat_idx < hci->DAT_entries;
dat_idx = find_next_bit(hci->DAT_data, hci->DAT_entries, dat_idx)) {
dat_w0 = dat_w0_read(dat_idx);
if (FIELD_GET(DAT_0_DYNAMIC_ADDRESS, dat_w0) == dev_addr)
return dat_idx;
}
return -ENODEV;
}
const struct hci_dat_ops mipi_i3c_hci_dat_v1 = {
.init = hci_dat_v1_init,
.cleanup = hci_dat_v1_cleanup,
.alloc_entry = hci_dat_v1_alloc_entry,
.free_entry = hci_dat_v1_free_entry,
.set_dynamic_addr = hci_dat_v1_set_dynamic_addr,
.set_static_addr = hci_dat_v1_set_static_addr,
.set_flags = hci_dat_v1_set_flags,
.clear_flags = hci_dat_v1_clear_flags,
.get_index = hci_dat_v1_get_index,
};

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drivers/i3c/master/mipi-i3c-hci/dct.h Normal file
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* Common DCT related stuff
*/
#ifndef DCT_H
#define DCT_H
void i3c_hci_dct_get_val(struct i3c_hci *hci, unsigned int dct_idx,
u64 *pid, unsigned int *dcr, unsigned int *bcr);
#endif

36
drivers/i3c/master/mipi-i3c-hci/dct_v1.c Normal file
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// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*/
#include <linux/device.h>
#include <linux/bitfield.h>
#include <linux/i3c/master.h>
#include <linux/io.h>
#include "hci.h"
#include "dct.h"
/*
* Device Characteristic Table
*/
void i3c_hci_dct_get_val(struct i3c_hci *hci, unsigned int dct_idx,
u64 *pid, unsigned int *dcr, unsigned int *bcr)
{
void __iomem *reg = hci->DCT_regs + dct_idx * 4 * 4;
u32 dct_entry_data[4];
unsigned int i;
for (i = 0; i < 4; i++) {
dct_entry_data[i] = readl(reg);
reg += 4;
}
*pid = ((u64)dct_entry_data[0]) << (47 - 32 + 1) |
FIELD_GET(W1_MASK(47, 32), dct_entry_data[1]);
*dcr = FIELD_GET(W2_MASK(71, 64), dct_entry_data[2]);
*bcr = FIELD_GET(W2_MASK(79, 72), dct_entry_data[2]);
}

784
drivers/i3c/master/mipi-i3c-hci/dma.c Normal file
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// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* Note: The I3C HCI v2.0 spec is still in flux. The IBI support is based on
* v1.x of the spec and v2.0 will likely be split out.
*/
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/i3c/master.h>
#include <linux/io.h>
#include "hci.h"
#include "cmd.h"
#include "ibi.h"
/*
* Software Parameter Values (somewhat arb itrary for now).
* Some of them could be determined at run time eventually.
*/
#define XFER_RINGS 1 /* max: 8 */
#define XFER_RING_ENTRIES 16 /* max: 255 */
#define IBI_RINGS 1 /* max: 8 */
#define IBI_STATUS_RING_ENTRIES 32 /* max: 255 */
#define IBI_CHUNK_CACHELINES 1 /* max: 256 bytes equivalent */
#define IBI_CHUNK_POOL_SIZE 128 /* max: 1023 */
/*
* Ring Header Preamble
*/
#define rhs_reg_read(r) readl(hci->RHS_regs + (RHS_##r))
#define rhs_reg_write(r, v) writel(v, hci->RHS_regs + (RHS_##r))
#define RHS_CONTROL 0x00
#define PREAMBLE_SIZE GENMASK(31, 24) /* Preamble Section Size */
#define HEADER_SIZE GENMASK(23, 16) /* Ring Header Size */
#define MAX_HEADER_COUNT_CAP GENMASK(7, 4) /* HC Max Header Count */
#define MAX_HEADER_COUNT GENMASK(3, 0) /* Driver Max Header Count */
#define RHS_RHn_OFFSET(n) (0x04 + (n)*4)
/*
* Ring Header (Per-Ring Bundle)
*/
#define rh_reg_read(r) readl(rh->regs + (RH_##r))
#define rh_reg_write(r, v) writel(v, rh->regs + (RH_##r))
#define RH_CR_SETUP 0x00 /* Command/Response Ring */
#define CR_XFER_STRUCT_SIZE GENMASK(31, 24)
#define CR_RESP_STRUCT_SIZE GENMASK(23, 16)
#define CR_RING_SIZE GENMASK(8, 0)
#define RH_IBI_SETUP 0x04
#define IBI_STATUS_STRUCT_SIZE GENMASK(31, 24)
#define IBI_STATUS_RING_SIZE GENMASK(23, 16)
#define IBI_DATA_CHUNK_SIZE GENMASK(12, 10)
#define IBI_DATA_CHUNK_COUNT GENMASK(9, 0)
#define RH_CHUNK_CONTROL 0x08
#define RH_INTR_STATUS 0x10
#define RH_INTR_STATUS_ENABLE 0x14
#define RH_INTR_SIGNAL_ENABLE 0x18
#define RH_INTR_FORCE 0x1c
#define INTR_IBI_READY BIT(12)
#define INTR_TRANSFER_COMPLETION BIT(11)
#define INTR_RING_OP BIT(10)
#define INTR_TRANSFER_ERR BIT(9)
#define INTR_WARN_INS_STOP_MODE BIT(7)
#define INTR_IBI_RING_FULL BIT(6)
#define INTR_TRANSFER_ABORT BIT(5)
#define RH_RING_STATUS 0x20
#define RING_STATUS_LOCKED BIT(3)
#define RING_STATUS_ABORTED BIT(2)
#define RING_STATUS_RUNNING BIT(1)
#define RING_STATUS_ENABLED BIT(0)
#define RH_RING_CONTROL 0x24
#define RING_CTRL_ABORT BIT(2)
#define RING_CTRL_RUN_STOP BIT(1)
#define RING_CTRL_ENABLE BIT(0)
#define RH_RING_OPERATION1 0x28
#define RING_OP1_IBI_DEQ_PTR GENMASK(23, 16)
#define RING_OP1_CR_SW_DEQ_PTR GENMASK(15, 8)
#define RING_OP1_CR_ENQ_PTR GENMASK(7, 0)
#define RH_RING_OPERATION2 0x2c
#define RING_OP2_IBI_ENQ_PTR GENMASK(23, 16)
#define RING_OP2_CR_DEQ_PTR GENMASK(7, 0)
#define RH_CMD_RING_BASE_LO 0x30
#define RH_CMD_RING_BASE_HI 0x34
#define RH_RESP_RING_BASE_LO 0x38
#define RH_RESP_RING_BASE_HI 0x3c
#define RH_IBI_STATUS_RING_BASE_LO 0x40
#define RH_IBI_STATUS_RING_BASE_HI 0x44
#define RH_IBI_DATA_RING_BASE_LO 0x48
#define RH_IBI_DATA_RING_BASE_HI 0x4c
#define RH_CMD_RING_SG 0x50 /* Ring Scatter Gather Support */
#define RH_RESP_RING_SG 0x54
#define RH_IBI_STATUS_RING_SG 0x58
#define RH_IBI_DATA_RING_SG 0x5c
#define RING_SG_BLP BIT(31) /* Buffer Vs. List Pointer */
#define RING_SG_LIST_SIZE GENMASK(15, 0)
/*
* Data Buffer Descriptor (in memory)
*/
#define DATA_BUF_BLP BIT(31) /* Buffer Vs. List Pointer */
#define DATA_BUF_IOC BIT(30) /* Interrupt on Completion */
#define DATA_BUF_BLOCK_SIZE GENMASK(15, 0)
struct hci_rh_data {
void __iomem *regs;
void *xfer, *resp, *ibi_status, *ibi_data;
dma_addr_t xfer_dma, resp_dma, ibi_status_dma, ibi_data_dma;
unsigned int xfer_entries, ibi_status_entries, ibi_chunks_total;
unsigned int xfer_struct_sz, resp_struct_sz, ibi_status_sz, ibi_chunk_sz;
unsigned int done_ptr, ibi_chunk_ptr;
struct hci_xfer **src_xfers;
spinlock_t lock;
struct completion op_done;
};
struct hci_rings_data {
unsigned int total;
struct hci_rh_data headers[];
};
struct hci_dma_dev_ibi_data {
struct i3c_generic_ibi_pool *pool;
unsigned int max_len;
};
static inline u32 lo32(dma_addr_t physaddr)
{
return physaddr;
}
static inline u32 hi32(dma_addr_t physaddr)
{
/* trickery to avoid compiler warnings on 32-bit build targets */
if (sizeof(dma_addr_t) > 4) {
u64 hi = physaddr;
return hi >> 32;
}
return 0;
}
static void hci_dma_cleanup(struct i3c_hci *hci)
{
struct hci_rings_data *rings = hci->io_data;
struct hci_rh_data *rh;
unsigned int i;
if (!rings)
return;
for (i = 0; i < rings->total; i++) {
rh = &rings->headers[i];
rh_reg_write(RING_CONTROL, 0);
rh_reg_write(CR_SETUP, 0);
rh_reg_write(IBI_SETUP, 0);
rh_reg_write(INTR_SIGNAL_ENABLE, 0);
if (rh->xfer)
dma_free_coherent(&hci->master.dev,
rh->xfer_struct_sz * rh->xfer_entries,
rh->xfer, rh->xfer_dma);
if (rh->resp)
dma_free_coherent(&hci->master.dev,
rh->resp_struct_sz * rh->xfer_entries,
rh->resp, rh->resp_dma);
kfree(rh->src_xfers);
if (rh->ibi_status)
dma_free_coherent(&hci->master.dev,
rh->ibi_status_sz * rh->ibi_status_entries,
rh->ibi_status, rh->ibi_status_dma);
if (rh->ibi_data_dma)
dma_unmap_single(&hci->master.dev, rh->ibi_data_dma,
rh->ibi_chunk_sz * rh->ibi_chunks_total,
DMA_FROM_DEVICE);
kfree(rh->ibi_data);
}
rhs_reg_write(CONTROL, 0);
kfree(rings);
hci->io_data = NULL;
}
static int hci_dma_init(struct i3c_hci *hci)
{
struct hci_rings_data *rings;
struct hci_rh_data *rh;
u32 regval;
unsigned int i, nr_rings, xfers_sz, resps_sz;
unsigned int ibi_status_ring_sz, ibi_data_ring_sz;
int ret;
regval = rhs_reg_read(CONTROL);
nr_rings = FIELD_GET(MAX_HEADER_COUNT_CAP, regval);
dev_info(&hci->master.dev, "%d DMA rings available\n", nr_rings);
if (unlikely(nr_rings > 8)) {
dev_err(&hci->master.dev, "number of rings should be <= 8\n");
nr_rings = 8;
}
if (nr_rings > XFER_RINGS)
nr_rings = XFER_RINGS;
rings = kzalloc(sizeof(*rings) + nr_rings * sizeof(*rh), GFP_KERNEL);
if (!rings)
return -ENOMEM;
hci->io_data = rings;
rings->total = nr_rings;
for (i = 0; i < rings->total; i++) {
u32 offset = rhs_reg_read(RHn_OFFSET(i));
dev_info(&hci->master.dev, "Ring %d at offset %#x\n", i, offset);
ret = -EINVAL;
if (!offset)
goto err_out;
rh = &rings->headers[i];
rh->regs = hci->base_regs + offset;
spin_lock_init(&rh->lock);
init_completion(&rh->op_done);
rh->xfer_entries = XFER_RING_ENTRIES;
regval = rh_reg_read(CR_SETUP);
rh->xfer_struct_sz = FIELD_GET(CR_XFER_STRUCT_SIZE, regval);
rh->resp_struct_sz = FIELD_GET(CR_RESP_STRUCT_SIZE, regval);
DBG("xfer_struct_sz = %d, resp_struct_sz = %d",
rh->xfer_struct_sz, rh->resp_struct_sz);
xfers_sz = rh->xfer_struct_sz * rh->xfer_entries;
resps_sz = rh->resp_struct_sz * rh->xfer_entries;
rh->xfer = dma_alloc_coherent(&hci->master.dev, xfers_sz,
&rh->xfer_dma, GFP_KERNEL);
rh->resp = dma_alloc_coherent(&hci->master.dev, resps_sz,
&rh->resp_dma, GFP_KERNEL);
rh->src_xfers =
kmalloc_array(rh->xfer_entries, sizeof(*rh->src_xfers),
GFP_KERNEL);
ret = -ENOMEM;
if (!rh->xfer || !rh->resp || !rh->src_xfers)
goto err_out;
rh_reg_write(CMD_RING_BASE_LO, lo32(rh->xfer_dma));
rh_reg_write(CMD_RING_BASE_HI, hi32(rh->xfer_dma));
rh_reg_write(RESP_RING_BASE_LO, lo32(rh->resp_dma));
rh_reg_write(RESP_RING_BASE_HI, hi32(rh->resp_dma));
regval = FIELD_PREP(CR_RING_SIZE, rh->xfer_entries);
rh_reg_write(CR_SETUP, regval);
rh_reg_write(INTR_STATUS_ENABLE, 0xffffffff);
rh_reg_write(INTR_SIGNAL_ENABLE, INTR_IBI_READY |
INTR_TRANSFER_COMPLETION |
INTR_RING_OP |
INTR_TRANSFER_ERR |
INTR_WARN_INS_STOP_MODE |
INTR_IBI_RING_FULL |
INTR_TRANSFER_ABORT);
/* IBIs */
if (i >= IBI_RINGS)
goto ring_ready;
regval = rh_reg_read(IBI_SETUP);
rh->ibi_status_sz = FIELD_GET(IBI_STATUS_STRUCT_SIZE, regval);
rh->ibi_status_entries = IBI_STATUS_RING_ENTRIES;
rh->ibi_chunks_total = IBI_CHUNK_POOL_SIZE;
rh->ibi_chunk_sz = dma_get_cache_alignment();
rh->ibi_chunk_sz *= IBI_CHUNK_CACHELINES;
BUG_ON(rh->ibi_chunk_sz > 256);
ibi_status_ring_sz = rh->ibi_status_sz * rh->ibi_status_entries;
ibi_data_ring_sz = rh->ibi_chunk_sz * rh->ibi_chunks_total;
rh->ibi_status =
dma_alloc_coherent(&hci->master.dev, ibi_status_ring_sz,
&rh->ibi_status_dma, GFP_KERNEL);
rh->ibi_data = kmalloc(ibi_data_ring_sz, GFP_KERNEL);
ret = -ENOMEM;
if (!rh->ibi_status || !rh->ibi_data)
goto err_out;
rh->ibi_data_dma =
dma_map_single(&hci->master.dev, rh->ibi_data,
ibi_data_ring_sz, DMA_FROM_DEVICE);
if (dma_mapping_error(&hci->master.dev, rh->ibi_data_dma)) {
rh->ibi_data_dma = 0;
ret = -ENOMEM;
goto err_out;
}
regval = FIELD_PREP(IBI_STATUS_RING_SIZE,
rh->ibi_status_entries) |
FIELD_PREP(IBI_DATA_CHUNK_SIZE,
ilog2(rh->ibi_chunk_sz) - 2) |
FIELD_PREP(IBI_DATA_CHUNK_COUNT,
rh->ibi_chunks_total);
rh_reg_write(IBI_SETUP, regval);
regval = rh_reg_read(INTR_SIGNAL_ENABLE);
regval |= INTR_IBI_READY;
rh_reg_write(INTR_SIGNAL_ENABLE, regval);
ring_ready:
rh_reg_write(RING_CONTROL, RING_CTRL_ENABLE);
}
regval = FIELD_PREP(MAX_HEADER_COUNT, rings->total);
rhs_reg_write(CONTROL, regval);
return 0;
err_out:
hci_dma_cleanup(hci);
return ret;
}
static void hci_dma_unmap_xfer(struct i3c_hci *hci,
struct hci_xfer *xfer_list, unsigned int n)
{
struct hci_xfer *xfer;
unsigned int i;
for (i = 0; i < n; i++) {
xfer = xfer_list + i;
dma_unmap_single(&hci->master.dev,
xfer->data_dma, xfer->data_len,
xfer->rnw ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
}
}
static int hci_dma_queue_xfer(struct i3c_hci *hci,
struct hci_xfer *xfer_list, int n)
{
struct hci_rings_data *rings = hci->io_data;
struct hci_rh_data *rh;
unsigned int i, ring, enqueue_ptr;
u32 op1_val, op2_val;
/* For now we only use ring 0 */
ring = 0;
rh = &rings->headers[ring];
op1_val = rh_reg_read(RING_OPERATION1);
enqueue_ptr = FIELD_GET(RING_OP1_CR_ENQ_PTR, op1_val);
for (i = 0; i < n; i++) {
struct hci_xfer *xfer = xfer_list + i;
u32 *ring_data = rh->xfer + rh->xfer_struct_sz * enqueue_ptr;
/* store cmd descriptor */
*ring_data++ = xfer->cmd_desc[0];
*ring_data++ = xfer->cmd_desc[1];
if (hci->cmd == &mipi_i3c_hci_cmd_v2) {
*ring_data++ = xfer->cmd_desc[2];
*ring_data++ = xfer->cmd_desc[3];
}
/* first word of Data Buffer Descriptor Structure */
if (!xfer->data)
xfer->data_len = 0;
*ring_data++ =
FIELD_PREP(DATA_BUF_BLOCK_SIZE, xfer->data_len) |
((i == n - 1) ? DATA_BUF_IOC : 0);
/* 2nd and 3rd words of Data Buffer Descriptor Structure */
if (xfer->data) {
xfer->data_dma =
dma_map_single(&hci->master.dev,
xfer->data,
xfer->data_len,
xfer->rnw ?
DMA_FROM_DEVICE :
DMA_TO_DEVICE);
if (dma_mapping_error(&hci->master.dev,
xfer->data_dma)) {
hci_dma_unmap_xfer(hci, xfer_list, i);
return -ENOMEM;
}
*ring_data++ = lo32(xfer->data_dma);
*ring_data++ = hi32(xfer->data_dma);
} else {
*ring_data++ = 0;
*ring_data++ = 0;
}
/* remember corresponding xfer struct */
rh->src_xfers[enqueue_ptr] = xfer;
/* remember corresponding ring/entry for this xfer structure */
xfer->ring_number = ring;
xfer->ring_entry = enqueue_ptr;
enqueue_ptr = (enqueue_ptr + 1) % rh->xfer_entries;
/*
* We may update the hardware view of the enqueue pointer
* only if we didn't reach its dequeue pointer.
*/
op2_val = rh_reg_read(RING_OPERATION2);
if (enqueue_ptr == FIELD_GET(RING_OP2_CR_DEQ_PTR, op2_val)) {
/* the ring is full */
hci_dma_unmap_xfer(hci, xfer_list, i + 1);
return -EBUSY;
}
}
/* take care to update the hardware enqueue pointer atomically */
spin_lock_irq(&rh->lock);
op1_val = rh_reg_read(RING_OPERATION1);
op1_val &= ~RING_OP1_CR_ENQ_PTR;
op1_val |= FIELD_PREP(RING_OP1_CR_ENQ_PTR, enqueue_ptr);
rh_reg_write(RING_OPERATION1, op1_val);
spin_unlock_irq(&rh->lock);
return 0;
}
static bool hci_dma_dequeue_xfer(struct i3c_hci *hci,
struct hci_xfer *xfer_list, int n)
{
struct hci_rings_data *rings = hci->io_data;
struct hci_rh_data *rh = &rings->headers[xfer_list[0].ring_number];
unsigned int i;
bool did_unqueue = false;
/* stop the ring */
rh_reg_write(RING_CONTROL, RING_CTRL_ABORT);
if (wait_for_completion_timeout(&rh->op_done, HZ) == 0) {
/*
* We're deep in it if ever this condition is ever met.
* Hardware might still be writing to memory, etc.
* Better suspend the world than risking silent corruption.
*/
dev_crit(&hci->master.dev, "unable to abort the ring\n");
BUG();
}
for (i = 0; i < n; i++) {
struct hci_xfer *xfer = xfer_list + i;
int idx = xfer->ring_entry;
/*
* At the time the abort happened, the xfer might have
* completed already. If not then replace corresponding
* descriptor entries with a no-op.
*/
if (idx >= 0) {
u32 *ring_data = rh->xfer + rh->xfer_struct_sz * idx;
/* store no-op cmd descriptor */
*ring_data++ = FIELD_PREP(CMD_0_ATTR, 0x7);
*ring_data++ = 0;
if (hci->cmd == &mipi_i3c_hci_cmd_v2) {
*ring_data++ = 0;
*ring_data++ = 0;
}
/* disassociate this xfer struct */
rh->src_xfers[idx] = NULL;
/* and unmap it */
hci_dma_unmap_xfer(hci, xfer, 1);
did_unqueue = true;
}
}
/* restart the ring */
rh_reg_write(RING_CONTROL, RING_CTRL_ENABLE);
return did_unqueue;
}
static void hci_dma_xfer_done(struct i3c_hci *hci, struct hci_rh_data *rh)
{
u32 op1_val, op2_val, resp, *ring_resp;
unsigned int tid, done_ptr = rh->done_ptr;
struct hci_xfer *xfer;
for (;;) {
op2_val = rh_reg_read(RING_OPERATION2);
if (done_ptr == FIELD_GET(RING_OP2_CR_DEQ_PTR, op2_val))
break;
ring_resp = rh->resp + rh->resp_struct_sz * done_ptr;
resp = *ring_resp;
tid = RESP_TID(resp);
DBG("resp = 0x%08x", resp);
xfer = rh->src_xfers[done_ptr];
if (!xfer) {
DBG("orphaned ring entry");
} else {
hci_dma_unmap_xfer(hci, xfer, 1);
xfer->ring_entry = -1;
xfer->response = resp;
if (tid != xfer->cmd_tid) {
dev_err(&hci->master.dev,
"response tid=%d when expecting %d\n",
tid, xfer->cmd_tid);
/* TODO: do something about it? */
}
if (xfer->completion)
complete(xfer->completion);
}
done_ptr = (done_ptr + 1) % rh->xfer_entries;
rh->done_ptr = done_ptr;
}
/* take care to update the software dequeue pointer atomically */
spin_lock(&rh->lock);
op1_val = rh_reg_read(RING_OPERATION1);
op1_val &= ~RING_OP1_CR_SW_DEQ_PTR;
op1_val |= FIELD_PREP(RING_OP1_CR_SW_DEQ_PTR, done_ptr);
rh_reg_write(RING_OPERATION1, op1_val);
spin_unlock(&rh->lock);
}
static int hci_dma_request_ibi(struct i3c_hci *hci, struct i3c_dev_desc *dev,
const struct i3c_ibi_setup *req)
{
struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev);
struct i3c_generic_ibi_pool *pool;
struct hci_dma_dev_ibi_data *dev_ibi;
dev_ibi = kmalloc(sizeof(*dev_ibi), GFP_KERNEL);
if (!dev_ibi)
return -ENOMEM;
pool = i3c_generic_ibi_alloc_pool(dev, req);
if (IS_ERR(pool)) {
kfree(dev_ibi);
return PTR_ERR(pool);
}
dev_ibi->pool = pool;
dev_ibi->max_len = req->max_payload_len;
dev_data->ibi_data = dev_ibi;
return 0;
}
static void hci_dma_free_ibi(struct i3c_hci *hci, struct i3c_dev_desc *dev)
{
struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev);
struct hci_dma_dev_ibi_data *dev_ibi = dev_data->ibi_data;
dev_data->ibi_data = NULL;
i3c_generic_ibi_free_pool(dev_ibi->pool);
kfree(dev_ibi);
}
static void hci_dma_recycle_ibi_slot(struct i3c_hci *hci,
struct i3c_dev_desc *dev,
struct i3c_ibi_slot *slot)
{
struct i3c_hci_dev_data *dev_data = i3c_dev_get_master_data(dev);
struct hci_dma_dev_ibi_data *dev_ibi = dev_data->ibi_data;
i3c_generic_ibi_recycle_slot(dev_ibi->pool, slot);
}
static void hci_dma_process_ibi(struct i3c_hci *hci, struct hci_rh_data *rh)
{
struct i3c_dev_desc *dev;
struct i3c_hci_dev_data *dev_data;
struct hci_dma_dev_ibi_data *dev_ibi;
struct i3c_ibi_slot *slot;
u32 op1_val, op2_val, ibi_status_error;
unsigned int ptr, enq_ptr, deq_ptr;
unsigned int ibi_size, ibi_chunks, ibi_data_offset, first_part;
int ibi_addr, last_ptr;
void *ring_ibi_data;
dma_addr_t ring_ibi_data_dma;
op1_val = rh_reg_read(RING_OPERATION1);
deq_ptr = FIELD_GET(RING_OP1_IBI_DEQ_PTR, op1_val);
op2_val = rh_reg_read(RING_OPERATION2);
enq_ptr = FIELD_GET(RING_OP2_IBI_ENQ_PTR, op2_val);
ibi_status_error = 0;
ibi_addr = -1;
ibi_chunks = 0;
ibi_size = 0;
last_ptr = -1;
/* let's find all we can about this IBI */
for (ptr = deq_ptr; ptr != enq_ptr;
ptr = (ptr + 1) % rh->ibi_status_entries) {
u32 ibi_status, *ring_ibi_status;
unsigned int chunks;
ring_ibi_status = rh->ibi_status + rh->ibi_status_sz * ptr;
ibi_status = *ring_ibi_status;
DBG("status = %#x", ibi_status);
if (ibi_status_error) {
/* we no longer care */
} else if (ibi_status & IBI_ERROR) {
ibi_status_error = ibi_status;
} else if (ibi_addr == -1) {
ibi_addr = FIELD_GET(IBI_TARGET_ADDR, ibi_status);
} else if (ibi_addr != FIELD_GET(IBI_TARGET_ADDR, ibi_status)) {
/* the address changed unexpectedly */
ibi_status_error = ibi_status;
}
chunks = FIELD_GET(IBI_CHUNKS, ibi_status);
ibi_chunks += chunks;
if (!(ibi_status & IBI_LAST_STATUS)) {
ibi_size += chunks * rh->ibi_chunk_sz;
} else {
ibi_size += FIELD_GET(IBI_DATA_LENGTH, ibi_status);
last_ptr = ptr;
break;
}
}
/* validate what we've got */
if (last_ptr == -1) {
/* this IBI sequence is not yet complete */
DBG("no LAST_STATUS available (e=%d d=%d)", enq_ptr, deq_ptr);
return;
}
deq_ptr = last_ptr + 1;
deq_ptr %= rh->ibi_status_entries;
if (ibi_status_error) {
dev_err(&hci->master.dev, "IBI error from %#x\n", ibi_addr);
goto done;
}
/* determine who this is for */
dev = i3c_hci_addr_to_dev(hci, ibi_addr);
if (!dev) {
dev_err(&hci->master.dev,
"IBI for unknown device %#x\n", ibi_addr);
goto done;
}
dev_data = i3c_dev_get_master_data(dev);
dev_ibi = dev_data->ibi_data;
if (ibi_size > dev_ibi->max_len) {
dev_err(&hci->master.dev, "IBI payload too big (%d > %d)\n",
ibi_size, dev_ibi->max_len);
goto done;
}
/*
* This ring model is not suitable for zero-copy processing of IBIs.
* We have the data chunk ring wrap-around to deal with, meaning
* that the payload might span multiple chunks beginning at the
* end of the ring and wrap to the start of the ring. Furthermore
* there is no guarantee that those chunks will be released in order
* and in a timely manner by the upper driver. So let's just copy
* them to a discrete buffer. In practice they're supposed to be
* small anyway.
*/
slot = i3c_generic_ibi_get_free_slot(dev_ibi->pool);
if (!slot) {
dev_err(&hci->master.dev, "no free slot for IBI\n");
goto done;
}
/* copy first part of the payload */
ibi_data_offset = rh->ibi_chunk_sz * rh->ibi_chunk_ptr;
ring_ibi_data = rh->ibi_data + ibi_data_offset;
ring_ibi_data_dma = rh->ibi_data_dma + ibi_data_offset;
first_part = (rh->ibi_chunks_total - rh->ibi_chunk_ptr)
* rh->ibi_chunk_sz;
if (first_part > ibi_size)
first_part = ibi_size;
dma_sync_single_for_cpu(&hci->master.dev, ring_ibi_data_dma,
first_part, DMA_FROM_DEVICE);
memcpy(slot->data, ring_ibi_data, first_part);
/* copy second part if any */
if (ibi_size > first_part) {
/* we wrap back to the start and copy remaining data */
ring_ibi_data = rh->ibi_data;
ring_ibi_data_dma = rh->ibi_data_dma;
dma_sync_single_for_cpu(&hci->master.dev, ring_ibi_data_dma,
ibi_size - first_part, DMA_FROM_DEVICE);
memcpy(slot->data + first_part, ring_ibi_data,
ibi_size - first_part);
}
/* submit it */
slot->dev = dev;
slot->len = ibi_size;
i3c_master_queue_ibi(dev, slot);
done:
/* take care to update the ibi dequeue pointer atomically */
spin_lock(&rh->lock);
op1_val = rh_reg_read(RING_OPERATION1);
op1_val &= ~RING_OP1_IBI_DEQ_PTR;
op1_val |= FIELD_PREP(RING_OP1_IBI_DEQ_PTR, deq_ptr);
rh_reg_write(RING_OPERATION1, op1_val);
spin_unlock(&rh->lock);
/* update the chunk pointer */
rh->ibi_chunk_ptr += ibi_chunks;
rh->ibi_chunk_ptr %= rh->ibi_chunks_total;
/* and tell the hardware about freed chunks */
rh_reg_write(CHUNK_CONTROL, rh_reg_read(CHUNK_CONTROL) + ibi_chunks);
}
static bool hci_dma_irq_handler(struct i3c_hci *hci, unsigned int mask)
{
struct hci_rings_data *rings = hci->io_data;
unsigned int i;
bool handled = false;
for (i = 0; mask && i < 8; i++) {
struct hci_rh_data *rh;
u32 status;
if (!(mask & BIT(i)))
continue;
mask &= ~BIT(i);
rh = &rings->headers[i];
status = rh_reg_read(INTR_STATUS);
DBG("rh%d status: %#x", i, status);
if (!status)
continue;
rh_reg_write(INTR_STATUS, status);
if (status & INTR_IBI_READY)
hci_dma_process_ibi(hci, rh);
if (status & (INTR_TRANSFER_COMPLETION | INTR_TRANSFER_ERR))
hci_dma_xfer_done(hci, rh);
if (status & INTR_RING_OP)
complete(&rh->op_done);
if (status & INTR_TRANSFER_ABORT)
dev_notice_ratelimited(&hci->master.dev,
"ring %d: Transfer Aborted\n", i);
if (status & INTR_WARN_INS_STOP_MODE)
dev_warn_ratelimited(&hci->master.dev,
"ring %d: Inserted Stop on Mode Change\n", i);
if (status & INTR_IBI_RING_FULL)
dev_err_ratelimited(&hci->master.dev,
"ring %d: IBI Ring Full Condition\n", i);
handled = true;
}
return handled;
}
const struct hci_io_ops mipi_i3c_hci_dma = {
.init = hci_dma_init,
.cleanup = hci_dma_cleanup,
.queue_xfer = hci_dma_queue_xfer,
.dequeue_xfer = hci_dma_dequeue_xfer,
.irq_handler = hci_dma_irq_handler,
.request_ibi = hci_dma_request_ibi,
.free_ibi = hci_dma_free_ibi,
.recycle_ibi_slot = hci_dma_recycle_ibi_slot,
};

308
drivers/i3c/master/mipi-i3c-hci/ext_caps.c Normal file
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// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*/
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/i3c/master.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include "hci.h"
#include "ext_caps.h"
#include "xfer_mode_rate.h"
/* Extended Capability Header */
#define CAP_HEADER_LENGTH GENMASK(23, 8)
#define CAP_HEADER_ID GENMASK(7, 0)
static int hci_extcap_hardware_id(struct i3c_hci *hci, void __iomem *base)
{
hci->vendor_mipi_id = readl(base + 0x04);
hci->vendor_version_id = readl(base + 0x08);
hci->vendor_product_id = readl(base + 0x0c);
dev_info(&hci->master.dev, "vendor MIPI ID: %#x\n", hci->vendor_mipi_id);
dev_info(&hci->master.dev, "vendor version ID: %#x\n", hci->vendor_version_id);
dev_info(&hci->master.dev, "vendor product ID: %#x\n", hci->vendor_product_id);
/* ought to go in a table if this grows too much */
switch (hci->vendor_mipi_id) {
case MIPI_VENDOR_NXP:
hci->quirks |= HCI_QUIRK_RAW_CCC;
DBG("raw CCC quirks set");
break;
}
return 0;
}
static int hci_extcap_master_config(struct i3c_hci *hci, void __iomem *base)
{
u32 master_config = readl(base + 0x04);
unsigned int operation_mode = FIELD_GET(GENMASK(5, 4), master_config);
static const char * const functionality[] = {
"(unknown)", "master only", "target only",
"primary/secondary master" };
dev_info(&hci->master.dev, "operation mode: %s\n", functionality[operation_mode]);
if (operation_mode & 0x1)
return 0;
dev_err(&hci->master.dev, "only master mode is currently supported\n");
return -EOPNOTSUPP;
}
static int hci_extcap_multi_bus(struct i3c_hci *hci, void __iomem *base)
{
u32 bus_instance = readl(base + 0x04);
unsigned int count = FIELD_GET(GENMASK(3, 0), bus_instance);
dev_info(&hci->master.dev, "%d bus instances\n", count);
return 0;
}
static int hci_extcap_xfer_modes(struct i3c_hci *hci, void __iomem *base)
{
u32 header = readl(base);
u32 entries = FIELD_GET(CAP_HEADER_LENGTH, header) - 1;
unsigned int index;
dev_info(&hci->master.dev, "transfer mode table has %d entries\n",
entries);
base += 4; /* skip header */
for (index = 0; index < entries; index++) {
u32 mode_entry = readl(base);
DBG("mode %d: 0x%08x", index, mode_entry);
/* TODO: will be needed when I3C core does more than SDR */
base += 4;
}
return 0;
}
static int hci_extcap_xfer_rates(struct i3c_hci *hci, void __iomem *base)
{
u32 header = readl(base);
u32 entries = FIELD_GET(CAP_HEADER_LENGTH, header) - 1;
u32 rate_entry;
unsigned int index, rate, rate_id, mode_id;
base += 4; /* skip header */
dev_info(&hci->master.dev, "available data rates:\n");
for (index = 0; index < entries; index++) {
rate_entry = readl(base);
DBG("entry %d: 0x%08x", index, rate_entry);
rate = FIELD_GET(XFERRATE_ACTUAL_RATE_KHZ, rate_entry);
rate_id = FIELD_GET(XFERRATE_RATE_ID, rate_entry);
mode_id = FIELD_GET(XFERRATE_MODE_ID, rate_entry);
dev_info(&hci->master.dev, "rate %d for %s = %d kHz\n",
rate_id,
mode_id == XFERRATE_MODE_I3C ? "I3C" :
mode_id == XFERRATE_MODE_I2C ? "I2C" :
"unknown mode",
rate);
base += 4;
}
return 0;
}
static int hci_extcap_auto_command(struct i3c_hci *hci, void __iomem *base)
{
u32 autocmd_ext_caps = readl(base + 0x04);
unsigned int max_count = FIELD_GET(GENMASK(3, 0), autocmd_ext_caps);
u32 autocmd_ext_config = readl(base + 0x08);
unsigned int count = FIELD_GET(GENMASK(3, 0), autocmd_ext_config);
dev_info(&hci->master.dev, "%d/%d active auto-command entries\n",
count, max_count);
/* remember auto-command register location for later use */
hci->AUTOCMD_regs = base;
return 0;
}
static int hci_extcap_debug(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "debug registers present\n");
hci->DEBUG_regs = base;
return 0;
}
static int hci_extcap_scheduled_cmd(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "scheduled commands available\n");
/* hci->schedcmd_regs = base; */
return 0;
}
static int hci_extcap_non_curr_master(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "Non-Current Master support available\n");
/* hci->NCM_regs = base; */
return 0;
}
static int hci_extcap_ccc_resp_conf(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "CCC Response Configuration available\n");
return 0;
}
static int hci_extcap_global_DAT(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "Global DAT available\n");
return 0;
}
static int hci_extcap_multilane(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "Master Multi-Lane support available\n");
return 0;
}
static int hci_extcap_ncm_multilane(struct i3c_hci *hci, void __iomem *base)
{
dev_info(&hci->master.dev, "NCM Multi-Lane support available\n");
return 0;
}
struct hci_ext_caps {
u8 id;
u16 min_length;
int (*parser)(struct i3c_hci *hci, void __iomem *base);
};
#define EXT_CAP(_id, _highest_mandatory_reg_offset, _parser) \
{ .id = (_id), .parser = (_parser), \
.min_length = (_highest_mandatory_reg_offset)/4 + 1 }
static const struct hci_ext_caps ext_capabilities[] = {
EXT_CAP(0x01, 0x0c, hci_extcap_hardware_id),
EXT_CAP(0x02, 0x04, hci_extcap_master_config),
EXT_CAP(0x03, 0x04, hci_extcap_multi_bus),
EXT_CAP(0x04, 0x24, hci_extcap_xfer_modes),
EXT_CAP(0x05, 0x08, hci_extcap_auto_command),
EXT_CAP(0x08, 0x40, hci_extcap_xfer_rates),
EXT_CAP(0x0c, 0x10, hci_extcap_debug),
EXT_CAP(0x0d, 0x0c, hci_extcap_scheduled_cmd),
EXT_CAP(0x0e, 0x80, hci_extcap_non_curr_master), /* TODO confirm size */
EXT_CAP(0x0f, 0x04, hci_extcap_ccc_resp_conf),
EXT_CAP(0x10, 0x08, hci_extcap_global_DAT),
EXT_CAP(0x9d, 0x04, hci_extcap_multilane),
EXT_CAP(0x9e, 0x04, hci_extcap_ncm_multilane),
};
static int hci_extcap_vendor_NXP(struct i3c_hci *hci, void __iomem *base)
{
hci->vendor_data = (__force void *)base;
dev_info(&hci->master.dev, "Build Date Info = %#x\n", readl(base + 1*4));
/* reset the FPGA */
writel(0xdeadbeef, base + 1*4);
return 0;
}
struct hci_ext_cap_vendor_specific {
u32 vendor;
u8 cap;
u16 min_length;
int (*parser)(struct i3c_hci *hci, void __iomem *base);
};
#define EXT_CAP_VENDOR(_vendor, _cap, _highest_mandatory_reg_offset) \
{ .vendor = (MIPI_VENDOR_##_vendor), .cap = (_cap), \
.parser = (hci_extcap_vendor_##_vendor), \
.min_length = (_highest_mandatory_reg_offset)/4 + 1 }
static const struct hci_ext_cap_vendor_specific vendor_ext_caps[] = {
EXT_CAP_VENDOR(NXP, 0xc0, 0x20),
};
static int hci_extcap_vendor_specific(struct i3c_hci *hci, void __iomem *base,
u32 cap_id, u32 cap_length)
{
const struct hci_ext_cap_vendor_specific *vendor_cap_entry;
int i;
vendor_cap_entry = NULL;
for (i = 0; i < ARRAY_SIZE(vendor_ext_caps); i++) {
if (vendor_ext_caps[i].vendor == hci->vendor_mipi_id &&
vendor_ext_caps[i].cap == cap_id) {
vendor_cap_entry = &vendor_ext_caps[i];
break;
}
}
if (!vendor_cap_entry) {
dev_notice(&hci->master.dev,
"unknown ext_cap 0x%02x for vendor 0x%02x\n",
cap_id, hci->vendor_mipi_id);
return 0;
}
if (cap_length < vendor_cap_entry->min_length) {
dev_err(&hci->master.dev,
"ext_cap 0x%02x has size %d (expecting >= %d)\n",
cap_id, cap_length, vendor_cap_entry->min_length);
return -EINVAL;
}
return vendor_cap_entry->parser(hci, base);
}
int i3c_hci_parse_ext_caps(struct i3c_hci *hci)
{
void __iomem *curr_cap = hci->EXTCAPS_regs;
void __iomem *end = curr_cap + 0x1000; /* some arbitrary limit */
u32 cap_header, cap_id, cap_length;
const struct hci_ext_caps *cap_entry;
int i, err = 0;
if (!curr_cap)
return 0;
for (; !err && curr_cap < end; curr_cap += cap_length * 4) {
cap_header = readl(curr_cap);
cap_id = FIELD_GET(CAP_HEADER_ID, cap_header);
cap_length = FIELD_GET(CAP_HEADER_LENGTH, cap_header);
DBG("id=0x%02x length=%d", cap_id, cap_length);
if (!cap_length)
break;
if (curr_cap + cap_length * 4 >= end) {
dev_err(&hci->master.dev,
"ext_cap 0x%02x has size %d (too big)\n",
cap_id, cap_length);
err = -EINVAL;
break;
}
if (cap_id >= 0xc0 && cap_id <= 0xcf) {
err = hci_extcap_vendor_specific(hci, curr_cap,
cap_id, cap_length);
continue;
}
cap_entry = NULL;
for (i = 0; i < ARRAY_SIZE(ext_capabilities); i++) {
if (ext_capabilities[i].id == cap_id) {
cap_entry = &ext_capabilities[i];
break;
}
}
if (!cap_entry) {
dev_notice(&hci->master.dev,
"unknown ext_cap 0x%02x\n", cap_id);
} else if (cap_length < cap_entry->min_length) {
dev_err(&hci->master.dev,
"ext_cap 0x%02x has size %d (expecting >= %d)\n",
cap_id, cap_length, cap_entry->min_length);
err = -EINVAL;
} else {
err = cap_entry->parser(hci, curr_cap);
}
}
return err;
}

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drivers/i3c/master/mipi-i3c-hci/ext_caps.h Normal file
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* Extended Capability Definitions
*/
#ifndef EXTCAPS_H
#define EXTCAPS_H
/* MIPI vendor IDs */
#define MIPI_VENDOR_NXP 0x11b
int i3c_hci_parse_ext_caps(struct i3c_hci *hci);
#endif

144
drivers/i3c/master/mipi-i3c-hci/hci.h Normal file
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* Common HCI stuff
*/
#ifndef HCI_H
#define HCI_H
/* Handy logging macro to save on line length */
#define DBG(x, ...) pr_devel("%s: " x "\n", __func__, ##__VA_ARGS__)
/* 32-bit word aware bit and mask macros */
#define W0_MASK(h, l) GENMASK((h) - 0, (l) - 0)
#define W1_MASK(h, l) GENMASK((h) - 32, (l) - 32)
#define W2_MASK(h, l) GENMASK((h) - 64, (l) - 64)
#define W3_MASK(h, l) GENMASK((h) - 96, (l) - 96)
/* Same for single bit macros (trailing _ to align with W*_MASK width) */
#define W0_BIT_(x) BIT((x) - 0)
#define W1_BIT_(x) BIT((x) - 32)
#define W2_BIT_(x) BIT((x) - 64)
#define W3_BIT_(x) BIT((x) - 96)
struct hci_cmd_ops;
/* Our main structure */
struct i3c_hci {
struct i3c_master_controller master;
void __iomem *base_regs;
void __iomem *DAT_regs;
void __iomem *DCT_regs;
void __iomem *RHS_regs;
void __iomem *PIO_regs;
void __iomem *EXTCAPS_regs;
void __iomem *AUTOCMD_regs;
void __iomem *DEBUG_regs;
const struct hci_io_ops *io;
void *io_data;
const struct hci_cmd_ops *cmd;
atomic_t next_cmd_tid;
u32 caps;
unsigned int quirks;
unsigned int DAT_entries;
unsigned int DAT_entry_size;
void *DAT_data;
unsigned int DCT_entries;
unsigned int DCT_entry_size;
u8 version_major;
u8 version_minor;
u8 revision;
u32 vendor_mipi_id;
u32 vendor_version_id;
u32 vendor_product_id;
void *vendor_data;
};
/*
* Structure to represent a master initiated transfer.
* The rnw, data and data_len fields must be initialized before calling any
* hci->cmd->*() method. The cmd method will initialize cmd_desc[] and
* possibly modify (clear) the data field. Then xfer->cmd_desc[0] can
* be augmented with CMD_0_ROC and/or CMD_0_TOC.
* The completion field needs to be initialized before queueing with
* hci->io->queue_xfer(), and requires CMD_0_ROC to be set.
*/
struct hci_xfer {
u32 cmd_desc[4];
u32 response;
bool rnw;
void *data;
unsigned int data_len;
unsigned int cmd_tid;
struct completion *completion;
union {
struct {
/* PIO specific */
struct hci_xfer *next_xfer;
struct hci_xfer *next_data;
struct hci_xfer *next_resp;
unsigned int data_left;
u32 data_word_before_partial;
};
struct {
/* DMA specific */
dma_addr_t data_dma;
int ring_number;
int ring_entry;
};
};
};
static inline struct hci_xfer *hci_alloc_xfer(unsigned int n)
{
return kzalloc(sizeof(struct hci_xfer) * n, GFP_KERNEL);
}
static inline void hci_free_xfer(struct hci_xfer *xfer, unsigned int n)
{
kfree(xfer);
}
/* This abstracts PIO vs DMA operations */
struct hci_io_ops {
bool (*irq_handler)(struct i3c_hci *hci, unsigned int mask);
int (*queue_xfer)(struct i3c_hci *hci, struct hci_xfer *xfer, int n);
bool (*dequeue_xfer)(struct i3c_hci *hci, struct hci_xfer *xfer, int n);
int (*request_ibi)(struct i3c_hci *hci, struct i3c_dev_desc *dev,
const struct i3c_ibi_setup *req);
void (*free_ibi)(struct i3c_hci *hci, struct i3c_dev_desc *dev);
void (*recycle_ibi_slot)(struct i3c_hci *hci, struct i3c_dev_desc *dev,
struct i3c_ibi_slot *slot);
int (*init)(struct i3c_hci *hci);
void (*cleanup)(struct i3c_hci *hci);
};
extern const struct hci_io_ops mipi_i3c_hci_pio;
extern const struct hci_io_ops mipi_i3c_hci_dma;
/* Our per device master private data */
struct i3c_hci_dev_data {
int dat_idx;
void *ibi_data;
};
/* list of quirks */
#define HCI_QUIRK_RAW_CCC BIT(1) /* CCC framing must be explicit */
/* global functions */
void mipi_i3c_hci_resume(struct i3c_hci *hci);
void mipi_i3c_hci_pio_reset(struct i3c_hci *hci);
void mipi_i3c_hci_dct_index_reset(struct i3c_hci *hci);
#endif

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drivers/i3c/master/mipi-i3c-hci/ibi.h Normal file
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* Common IBI related stuff
*/
#ifndef IBI_H
#define IBI_H
/*
* IBI Status Descriptor bits
*/
#define IBI_STS BIT(31)
#define IBI_ERROR BIT(30)
#define IBI_STATUS_TYPE BIT(29)
#define IBI_HW_CONTEXT GENMASK(28, 26)
#define IBI_TS BIT(25)
#define IBI_LAST_STATUS BIT(24)
#define IBI_CHUNKS GENMASK(23, 16)
#define IBI_ID GENMASK(15, 8)
#define IBI_TARGET_ADDR GENMASK(15, 9)
#define IBI_TARGET_RNW BIT(8)
#define IBI_DATA_LENGTH GENMASK(7, 0)
/* handy helpers */
static inline struct i3c_dev_desc *
i3c_hci_addr_to_dev(struct i3c_hci *hci, unsigned int addr)
{
struct i3c_bus *bus = i3c_master_get_bus(&hci->master);
struct i3c_dev_desc *dev;
i3c_bus_for_each_i3cdev(bus, dev) {
if (dev->info.dyn_addr == addr)
return dev;
}
return NULL;
}
#endif

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drivers/i3c/master/mipi-i3c-hci/pio.c Normal file
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drivers/i3c/master/mipi-i3c-hci/xfer_mode_rate.h Normal file
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (c) 2020, MIPI Alliance, Inc.
*
* Author: Nicolas Pitre <npitre@baylibre.com>
*
* Transfer Mode/Rate Table definitions as found in extended capability
* sections 0x04 and 0x08.
* This applies starting from I3C HCI v2.0.
*/
#ifndef XFER_MODE_RATE_H
#define XFER_MODE_RATE_H
/*
* Master Transfer Mode Table Fixed Indexes.
*
* Indexes 0x0 and 0x8 are mandatory. Availability for the rest must be
* obtained from the mode table in the extended capability area.
* Presence and definitions for indexes beyond these ones may vary.
*/
#define XFERMODE_IDX_I3C_SDR 0x00 /* I3C SDR Mode */
#define XFERMODE_IDX_I3C_HDR_DDR 0x01 /* I3C HDR-DDR Mode */
#define XFERMODE_IDX_I3C_HDR_T 0x02 /* I3C HDR-Ternary Mode */
#define XFERMODE_IDX_I3C_HDR_BT 0x03 /* I3C HDR-BT Mode */
#define XFERMODE_IDX_I2C 0x08 /* Legacy I2C Mode */
/*
* Transfer Mode Table Entry Bits Definitions
*/
#define XFERMODE_VALID_XFER_ADD_FUNC GENMASK(21, 16)
#define XFERMODE_ML_DATA_XFER_CODING GENMASK(15, 11)
#define XFERMODE_ML_ADDL_LANES GENMASK(10, 8)
#define XFERMODE_SUPPORTED BIT(7)
#define XFERMODE_MODE GENMASK(3, 0)
/*
* Master Data Transfer Rate Selector Values.
*
* These are the values to be used in the command descriptor XFER_RATE field
* and found in the RATE_ID field below.
* The I3C_SDR0, I3C_SDR1, I3C_SDR2, I3C_SDR3, I3C_SDR4 and I2C_FM rates
* are required, everything else is optional and discoverable in the
* Data Transfer Rate Table. Indicated are typical rates. The actual
* rates may vary slightly and are also specified in the Data Transfer
* Rate Table.
*/
#define XFERRATE_I3C_SDR0 0x00 /* 12.5 MHz */
#define XFERRATE_I3C_SDR1 0x01 /* 8 MHz */
#define XFERRATE_I3C_SDR2 0x02 /* 6 MHz */
#define XFERRATE_I3C_SDR3 0x03 /* 4 MHz */
#define XFERRATE_I3C_SDR4 0x04 /* 2 MHz */
#define XFERRATE_I3C_SDR_FM_FMP 0x05 /* 400 KHz / 1 MHz */
#define XFERRATE_I3C_SDR_USER6 0x06 /* User Defined */
#define XFERRATE_I3C_SDR_USER7 0x07 /* User Defined */
#define XFERRATE_I2C_FM 0x00 /* 400 KHz */
#define XFERRATE_I2C_FMP 0x01 /* 1 MHz */
#define XFERRATE_I2C_USER2 0x02 /* User Defined */
#define XFERRATE_I2C_USER3 0x03 /* User Defined */
#define XFERRATE_I2C_USER4 0x04 /* User Defined */
#define XFERRATE_I2C_USER5 0x05 /* User Defined */
#define XFERRATE_I2C_USER6 0x06 /* User Defined */
#define XFERRATE_I2C_USER7 0x07 /* User Defined */
/*
* Master Data Transfer Rate Table Mode ID values.
*/
#define XFERRATE_MODE_I3C 0x00
#define XFERRATE_MODE_I2C 0x08
/*
* Master Data Transfer Rate Table Entry Bits Definitions
*/
#define XFERRATE_MODE_ID GENMASK(31, 28)
#define XFERRATE_RATE_ID GENMASK(22, 20)
#define XFERRATE_ACTUAL_RATE_KHZ GENMASK(19, 0)
#endif