732 строки
18 KiB
C
732 строки
18 KiB
C
/*
|
|
* Thunderbolt Cactus Ridge driver - control channel and configuration commands
|
|
*
|
|
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
|
|
*/
|
|
|
|
#include <linux/crc32.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/dmapool.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/kfifo.h>
|
|
|
|
#include "ctl.h"
|
|
|
|
|
|
struct ctl_pkg {
|
|
struct tb_ctl *ctl;
|
|
void *buffer;
|
|
struct ring_frame frame;
|
|
};
|
|
|
|
#define TB_CTL_RX_PKG_COUNT 10
|
|
|
|
/**
|
|
* struct tb_cfg - thunderbolt control channel
|
|
*/
|
|
struct tb_ctl {
|
|
struct tb_nhi *nhi;
|
|
struct tb_ring *tx;
|
|
struct tb_ring *rx;
|
|
|
|
struct dma_pool *frame_pool;
|
|
struct ctl_pkg *rx_packets[TB_CTL_RX_PKG_COUNT];
|
|
DECLARE_KFIFO(response_fifo, struct ctl_pkg*, 16);
|
|
struct completion response_ready;
|
|
|
|
hotplug_cb callback;
|
|
void *callback_data;
|
|
};
|
|
|
|
|
|
#define tb_ctl_WARN(ctl, format, arg...) \
|
|
dev_WARN(&(ctl)->nhi->pdev->dev, format, ## arg)
|
|
|
|
#define tb_ctl_err(ctl, format, arg...) \
|
|
dev_err(&(ctl)->nhi->pdev->dev, format, ## arg)
|
|
|
|
#define tb_ctl_warn(ctl, format, arg...) \
|
|
dev_warn(&(ctl)->nhi->pdev->dev, format, ## arg)
|
|
|
|
#define tb_ctl_info(ctl, format, arg...) \
|
|
dev_info(&(ctl)->nhi->pdev->dev, format, ## arg)
|
|
|
|
|
|
/* configuration packets definitions */
|
|
|
|
enum tb_cfg_pkg_type {
|
|
TB_CFG_PKG_READ = 1,
|
|
TB_CFG_PKG_WRITE = 2,
|
|
TB_CFG_PKG_ERROR = 3,
|
|
TB_CFG_PKG_NOTIFY_ACK = 4,
|
|
TB_CFG_PKG_EVENT = 5,
|
|
TB_CFG_PKG_XDOMAIN_REQ = 6,
|
|
TB_CFG_PKG_XDOMAIN_RESP = 7,
|
|
TB_CFG_PKG_OVERRIDE = 8,
|
|
TB_CFG_PKG_RESET = 9,
|
|
TB_CFG_PKG_PREPARE_TO_SLEEP = 0xd,
|
|
};
|
|
|
|
/* common header */
|
|
struct tb_cfg_header {
|
|
u32 route_hi:22;
|
|
u32 unknown:10; /* highest order bit is set on replies */
|
|
u32 route_lo;
|
|
} __packed;
|
|
|
|
/* additional header for read/write packets */
|
|
struct tb_cfg_address {
|
|
u32 offset:13; /* in dwords */
|
|
u32 length:6; /* in dwords */
|
|
u32 port:6;
|
|
enum tb_cfg_space space:2;
|
|
u32 seq:2; /* sequence number */
|
|
u32 zero:3;
|
|
} __packed;
|
|
|
|
/* TB_CFG_PKG_READ, response for TB_CFG_PKG_WRITE */
|
|
struct cfg_read_pkg {
|
|
struct tb_cfg_header header;
|
|
struct tb_cfg_address addr;
|
|
} __packed;
|
|
|
|
/* TB_CFG_PKG_WRITE, response for TB_CFG_PKG_READ */
|
|
struct cfg_write_pkg {
|
|
struct tb_cfg_header header;
|
|
struct tb_cfg_address addr;
|
|
u32 data[64]; /* maximum size, tb_cfg_address.length has 6 bits */
|
|
} __packed;
|
|
|
|
/* TB_CFG_PKG_ERROR */
|
|
struct cfg_error_pkg {
|
|
struct tb_cfg_header header;
|
|
enum tb_cfg_error error:4;
|
|
u32 zero1:4;
|
|
u32 port:6;
|
|
u32 zero2:2; /* Both should be zero, still they are different fields. */
|
|
u32 zero3:16;
|
|
} __packed;
|
|
|
|
/* TB_CFG_PKG_EVENT */
|
|
struct cfg_event_pkg {
|
|
struct tb_cfg_header header;
|
|
u32 port:6;
|
|
u32 zero:25;
|
|
bool unplug:1;
|
|
} __packed;
|
|
|
|
/* TB_CFG_PKG_RESET */
|
|
struct cfg_reset_pkg {
|
|
struct tb_cfg_header header;
|
|
} __packed;
|
|
|
|
/* TB_CFG_PKG_PREPARE_TO_SLEEP */
|
|
struct cfg_pts_pkg {
|
|
struct tb_cfg_header header;
|
|
u32 data;
|
|
} __packed;
|
|
|
|
|
|
/* utility functions */
|
|
|
|
static u64 get_route(struct tb_cfg_header header)
|
|
{
|
|
return (u64) header.route_hi << 32 | header.route_lo;
|
|
}
|
|
|
|
static struct tb_cfg_header make_header(u64 route)
|
|
{
|
|
struct tb_cfg_header header = {
|
|
.route_hi = route >> 32,
|
|
.route_lo = route,
|
|
};
|
|
/* check for overflow, route_hi is not 32 bits! */
|
|
WARN_ON(get_route(header) != route);
|
|
return header;
|
|
}
|
|
|
|
static int check_header(struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type,
|
|
u64 route)
|
|
{
|
|
struct tb_cfg_header *header = pkg->buffer;
|
|
|
|
/* check frame, TODO: frame flags */
|
|
if (WARN(len != pkg->frame.size,
|
|
"wrong framesize (expected %#x, got %#x)\n",
|
|
len, pkg->frame.size))
|
|
return -EIO;
|
|
if (WARN(type != pkg->frame.eof, "wrong eof (expected %#x, got %#x)\n",
|
|
type, pkg->frame.eof))
|
|
return -EIO;
|
|
if (WARN(pkg->frame.sof, "wrong sof (expected 0x0, got %#x)\n",
|
|
pkg->frame.sof))
|
|
return -EIO;
|
|
|
|
/* check header */
|
|
if (WARN(header->unknown != 1 << 9,
|
|
"header->unknown is %#x\n", header->unknown))
|
|
return -EIO;
|
|
if (WARN(route != get_route(*header),
|
|
"wrong route (expected %llx, got %llx)",
|
|
route, get_route(*header)))
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static int check_config_address(struct tb_cfg_address addr,
|
|
enum tb_cfg_space space, u32 offset,
|
|
u32 length)
|
|
{
|
|
if (WARN(addr.zero, "addr.zero is %#x\n", addr.zero))
|
|
return -EIO;
|
|
if (WARN(space != addr.space, "wrong space (expected %x, got %x\n)",
|
|
space, addr.space))
|
|
return -EIO;
|
|
if (WARN(offset != addr.offset, "wrong offset (expected %x, got %x\n)",
|
|
offset, addr.offset))
|
|
return -EIO;
|
|
if (WARN(length != addr.length, "wrong space (expected %x, got %x\n)",
|
|
length, addr.length))
|
|
return -EIO;
|
|
if (WARN(addr.seq, "addr.seq is %#x\n", addr.seq))
|
|
return -EIO;
|
|
/*
|
|
* We cannot check addr->port as it is set to the upstream port of the
|
|
* sender.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static struct tb_cfg_result decode_error(struct ctl_pkg *response)
|
|
{
|
|
struct cfg_error_pkg *pkg = response->buffer;
|
|
struct tb_cfg_result res = { 0 };
|
|
res.response_route = get_route(pkg->header);
|
|
res.response_port = 0;
|
|
res.err = check_header(response, sizeof(*pkg), TB_CFG_PKG_ERROR,
|
|
get_route(pkg->header));
|
|
if (res.err)
|
|
return res;
|
|
|
|
WARN(pkg->zero1, "pkg->zero1 is %#x\n", pkg->zero1);
|
|
WARN(pkg->zero2, "pkg->zero1 is %#x\n", pkg->zero1);
|
|
WARN(pkg->zero3, "pkg->zero1 is %#x\n", pkg->zero1);
|
|
res.err = 1;
|
|
res.tb_error = pkg->error;
|
|
res.response_port = pkg->port;
|
|
return res;
|
|
|
|
}
|
|
|
|
static struct tb_cfg_result parse_header(struct ctl_pkg *pkg, u32 len,
|
|
enum tb_cfg_pkg_type type, u64 route)
|
|
{
|
|
struct tb_cfg_header *header = pkg->buffer;
|
|
struct tb_cfg_result res = { 0 };
|
|
|
|
if (pkg->frame.eof == TB_CFG_PKG_ERROR)
|
|
return decode_error(pkg);
|
|
|
|
res.response_port = 0; /* will be updated later for cfg_read/write */
|
|
res.response_route = get_route(*header);
|
|
res.err = check_header(pkg, len, type, route);
|
|
return res;
|
|
}
|
|
|
|
static void tb_cfg_print_error(struct tb_ctl *ctl,
|
|
const struct tb_cfg_result *res)
|
|
{
|
|
WARN_ON(res->err != 1);
|
|
switch (res->tb_error) {
|
|
case TB_CFG_ERROR_PORT_NOT_CONNECTED:
|
|
/* Port is not connected. This can happen during surprise
|
|
* removal. Do not warn. */
|
|
return;
|
|
case TB_CFG_ERROR_INVALID_CONFIG_SPACE:
|
|
/*
|
|
* Invalid cfg_space/offset/length combination in
|
|
* cfg_read/cfg_write.
|
|
*/
|
|
tb_ctl_WARN(ctl,
|
|
"CFG_ERROR(%llx:%x): Invalid config space of offset\n",
|
|
res->response_route, res->response_port);
|
|
return;
|
|
case TB_CFG_ERROR_NO_SUCH_PORT:
|
|
/*
|
|
* - The route contains a non-existent port.
|
|
* - The route contains a non-PHY port (e.g. PCIe).
|
|
* - The port in cfg_read/cfg_write does not exist.
|
|
*/
|
|
tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Invalid port\n",
|
|
res->response_route, res->response_port);
|
|
return;
|
|
case TB_CFG_ERROR_LOOP:
|
|
tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Route contains a loop\n",
|
|
res->response_route, res->response_port);
|
|
return;
|
|
default:
|
|
/* 5,6,7,9 and 11 are also valid error codes */
|
|
tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Unknown error\n",
|
|
res->response_route, res->response_port);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void cpu_to_be32_array(__be32 *dst, u32 *src, size_t len)
|
|
{
|
|
int i;
|
|
for (i = 0; i < len; i++)
|
|
dst[i] = cpu_to_be32(src[i]);
|
|
}
|
|
|
|
static void be32_to_cpu_array(u32 *dst, __be32 *src, size_t len)
|
|
{
|
|
int i;
|
|
for (i = 0; i < len; i++)
|
|
dst[i] = be32_to_cpu(src[i]);
|
|
}
|
|
|
|
static __be32 tb_crc(void *data, size_t len)
|
|
{
|
|
return cpu_to_be32(~__crc32c_le(~0, data, len));
|
|
}
|
|
|
|
static void tb_ctl_pkg_free(struct ctl_pkg *pkg)
|
|
{
|
|
if (pkg) {
|
|
dma_pool_free(pkg->ctl->frame_pool,
|
|
pkg->buffer, pkg->frame.buffer_phy);
|
|
kfree(pkg);
|
|
}
|
|
}
|
|
|
|
static struct ctl_pkg *tb_ctl_pkg_alloc(struct tb_ctl *ctl)
|
|
{
|
|
struct ctl_pkg *pkg = kzalloc(sizeof(*pkg), GFP_KERNEL);
|
|
if (!pkg)
|
|
return 0;
|
|
pkg->ctl = ctl;
|
|
pkg->buffer = dma_pool_alloc(ctl->frame_pool, GFP_KERNEL,
|
|
&pkg->frame.buffer_phy);
|
|
if (!pkg->buffer) {
|
|
kfree(pkg);
|
|
return 0;
|
|
}
|
|
return pkg;
|
|
}
|
|
|
|
|
|
/* RX/TX handling */
|
|
|
|
static void tb_ctl_tx_callback(struct tb_ring *ring, struct ring_frame *frame,
|
|
bool canceled)
|
|
{
|
|
struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame);
|
|
tb_ctl_pkg_free(pkg);
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_tx() - transmit a packet on the control channel
|
|
*
|
|
* len must be a multiple of four.
|
|
*
|
|
* Return: Returns 0 on success or an error code on failure.
|
|
*/
|
|
static int tb_ctl_tx(struct tb_ctl *ctl, void *data, size_t len,
|
|
enum tb_cfg_pkg_type type)
|
|
{
|
|
int res;
|
|
struct ctl_pkg *pkg;
|
|
if (len % 4 != 0) { /* required for le->be conversion */
|
|
tb_ctl_WARN(ctl, "TX: invalid size: %zu\n", len);
|
|
return -EINVAL;
|
|
}
|
|
if (len > TB_FRAME_SIZE - 4) { /* checksum is 4 bytes */
|
|
tb_ctl_WARN(ctl, "TX: packet too large: %zu/%d\n",
|
|
len, TB_FRAME_SIZE - 4);
|
|
return -EINVAL;
|
|
}
|
|
pkg = tb_ctl_pkg_alloc(ctl);
|
|
if (!pkg)
|
|
return -ENOMEM;
|
|
pkg->frame.callback = tb_ctl_tx_callback;
|
|
pkg->frame.size = len + 4;
|
|
pkg->frame.sof = type;
|
|
pkg->frame.eof = type;
|
|
cpu_to_be32_array(pkg->buffer, data, len / 4);
|
|
*(u32 *) (pkg->buffer + len) = tb_crc(pkg->buffer, len);
|
|
|
|
res = ring_tx(ctl->tx, &pkg->frame);
|
|
if (res) /* ring is stopped */
|
|
tb_ctl_pkg_free(pkg);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tb_ctl_handle_plug_event() - acknowledge a plug event, invoke ctl->callback
|
|
*/
|
|
static void tb_ctl_handle_plug_event(struct tb_ctl *ctl,
|
|
struct ctl_pkg *response)
|
|
{
|
|
struct cfg_event_pkg *pkg = response->buffer;
|
|
u64 route = get_route(pkg->header);
|
|
|
|
if (check_header(response, sizeof(*pkg), TB_CFG_PKG_EVENT, route)) {
|
|
tb_ctl_warn(ctl, "malformed TB_CFG_PKG_EVENT\n");
|
|
return;
|
|
}
|
|
|
|
if (tb_cfg_error(ctl, route, pkg->port, TB_CFG_ERROR_ACK_PLUG_EVENT))
|
|
tb_ctl_warn(ctl, "could not ack plug event on %llx:%x\n",
|
|
route, pkg->port);
|
|
WARN(pkg->zero, "pkg->zero is %#x\n", pkg->zero);
|
|
ctl->callback(ctl->callback_data, route, pkg->port, pkg->unplug);
|
|
}
|
|
|
|
static void tb_ctl_rx_submit(struct ctl_pkg *pkg)
|
|
{
|
|
ring_rx(pkg->ctl->rx, &pkg->frame); /*
|
|
* We ignore failures during stop.
|
|
* All rx packets are referenced
|
|
* from ctl->rx_packets, so we do
|
|
* not loose them.
|
|
*/
|
|
}
|
|
|
|
static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame,
|
|
bool canceled)
|
|
{
|
|
struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame);
|
|
|
|
if (canceled)
|
|
return; /*
|
|
* ring is stopped, packet is referenced from
|
|
* ctl->rx_packets.
|
|
*/
|
|
|
|
if (frame->size < 4 || frame->size % 4 != 0) {
|
|
tb_ctl_err(pkg->ctl, "RX: invalid size %#x, dropping packet\n",
|
|
frame->size);
|
|
goto rx;
|
|
}
|
|
|
|
frame->size -= 4; /* remove checksum */
|
|
if (*(u32 *) (pkg->buffer + frame->size)
|
|
!= tb_crc(pkg->buffer, frame->size)) {
|
|
tb_ctl_err(pkg->ctl,
|
|
"RX: checksum mismatch, dropping packet\n");
|
|
goto rx;
|
|
}
|
|
be32_to_cpu_array(pkg->buffer, pkg->buffer, frame->size / 4);
|
|
|
|
if (frame->eof == TB_CFG_PKG_EVENT) {
|
|
tb_ctl_handle_plug_event(pkg->ctl, pkg);
|
|
goto rx;
|
|
}
|
|
if (!kfifo_put(&pkg->ctl->response_fifo, pkg)) {
|
|
tb_ctl_err(pkg->ctl, "RX: fifo is full\n");
|
|
goto rx;
|
|
}
|
|
complete(&pkg->ctl->response_ready);
|
|
return;
|
|
rx:
|
|
tb_ctl_rx_submit(pkg);
|
|
}
|
|
|
|
/**
|
|
* tb_ctl_rx() - receive a packet from the control channel
|
|
*/
|
|
static struct tb_cfg_result tb_ctl_rx(struct tb_ctl *ctl, void *buffer,
|
|
size_t length, int timeout_msec,
|
|
u8 route, enum tb_cfg_pkg_type type)
|
|
{
|
|
struct tb_cfg_result res;
|
|
struct ctl_pkg *pkg;
|
|
|
|
if (!wait_for_completion_timeout(&ctl->response_ready,
|
|
msecs_to_jiffies(timeout_msec))) {
|
|
tb_ctl_WARN(ctl, "RX: timeout\n");
|
|
return (struct tb_cfg_result) { .err = -ETIMEDOUT };
|
|
}
|
|
if (!kfifo_get(&ctl->response_fifo, &pkg)) {
|
|
tb_ctl_WARN(ctl, "empty kfifo\n");
|
|
return (struct tb_cfg_result) { .err = -EIO };
|
|
}
|
|
|
|
res = parse_header(pkg, length, type, route);
|
|
if (!res.err)
|
|
memcpy(buffer, pkg->buffer, length);
|
|
tb_ctl_rx_submit(pkg);
|
|
return res;
|
|
}
|
|
|
|
|
|
/* public interface, alloc/start/stop/free */
|
|
|
|
/**
|
|
* tb_ctl_alloc() - allocate a control channel
|
|
*
|
|
* cb will be invoked once for every hot plug event.
|
|
*
|
|
* Return: Returns a pointer on success or NULL on failure.
|
|
*/
|
|
struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, hotplug_cb cb, void *cb_data)
|
|
{
|
|
int i;
|
|
struct tb_ctl *ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
|
|
if (!ctl)
|
|
return NULL;
|
|
ctl->nhi = nhi;
|
|
ctl->callback = cb;
|
|
ctl->callback_data = cb_data;
|
|
|
|
init_completion(&ctl->response_ready);
|
|
INIT_KFIFO(ctl->response_fifo);
|
|
ctl->frame_pool = dma_pool_create("thunderbolt_ctl", &nhi->pdev->dev,
|
|
TB_FRAME_SIZE, 4, 0);
|
|
if (!ctl->frame_pool)
|
|
goto err;
|
|
|
|
ctl->tx = ring_alloc_tx(nhi, 0, 10);
|
|
if (!ctl->tx)
|
|
goto err;
|
|
|
|
ctl->rx = ring_alloc_rx(nhi, 0, 10);
|
|
if (!ctl->rx)
|
|
goto err;
|
|
|
|
for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++) {
|
|
ctl->rx_packets[i] = tb_ctl_pkg_alloc(ctl);
|
|
if (!ctl->rx_packets[i])
|
|
goto err;
|
|
ctl->rx_packets[i]->frame.callback = tb_ctl_rx_callback;
|
|
}
|
|
|
|
tb_ctl_info(ctl, "control channel created\n");
|
|
return ctl;
|
|
err:
|
|
tb_ctl_free(ctl);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* tb_ctl_free() - free a control channel
|
|
*
|
|
* Must be called after tb_ctl_stop.
|
|
*
|
|
* Must NOT be called from ctl->callback.
|
|
*/
|
|
void tb_ctl_free(struct tb_ctl *ctl)
|
|
{
|
|
int i;
|
|
if (ctl->rx)
|
|
ring_free(ctl->rx);
|
|
if (ctl->tx)
|
|
ring_free(ctl->tx);
|
|
|
|
/* free RX packets */
|
|
for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++)
|
|
tb_ctl_pkg_free(ctl->rx_packets[i]);
|
|
|
|
|
|
if (ctl->frame_pool)
|
|
dma_pool_destroy(ctl->frame_pool);
|
|
kfree(ctl);
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_start() - start/resume the control channel
|
|
*/
|
|
void tb_ctl_start(struct tb_ctl *ctl)
|
|
{
|
|
int i;
|
|
tb_ctl_info(ctl, "control channel starting...\n");
|
|
ring_start(ctl->tx); /* is used to ack hotplug packets, start first */
|
|
ring_start(ctl->rx);
|
|
for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++)
|
|
tb_ctl_rx_submit(ctl->rx_packets[i]);
|
|
}
|
|
|
|
/**
|
|
* control() - pause the control channel
|
|
*
|
|
* All invocations of ctl->callback will have finished after this method
|
|
* returns.
|
|
*
|
|
* Must NOT be called from ctl->callback.
|
|
*/
|
|
void tb_ctl_stop(struct tb_ctl *ctl)
|
|
{
|
|
ring_stop(ctl->rx);
|
|
ring_stop(ctl->tx);
|
|
|
|
if (!kfifo_is_empty(&ctl->response_fifo))
|
|
tb_ctl_WARN(ctl, "dangling response in response_fifo\n");
|
|
kfifo_reset(&ctl->response_fifo);
|
|
tb_ctl_info(ctl, "control channel stopped\n");
|
|
}
|
|
|
|
/* public interface, commands */
|
|
|
|
/**
|
|
* tb_cfg_error() - send error packet
|
|
*
|
|
* Return: Returns 0 on success or an error code on failure.
|
|
*/
|
|
int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port,
|
|
enum tb_cfg_error error)
|
|
{
|
|
struct cfg_error_pkg pkg = {
|
|
.header = make_header(route),
|
|
.port = port,
|
|
.error = error,
|
|
};
|
|
tb_ctl_info(ctl, "resetting error on %llx:%x.\n", route, port);
|
|
return tb_ctl_tx(ctl, &pkg, sizeof(pkg), TB_CFG_PKG_ERROR);
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_reset() - send a reset packet and wait for a response
|
|
*
|
|
* If the switch at route is incorrectly configured then we will not receive a
|
|
* reply (even though the switch will reset). The caller should check for
|
|
* -ETIMEDOUT and attempt to reconfigure the switch.
|
|
*/
|
|
struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
|
|
int timeout_msec)
|
|
{
|
|
int err;
|
|
struct cfg_reset_pkg request = { .header = make_header(route) };
|
|
struct tb_cfg_header reply;
|
|
|
|
err = tb_ctl_tx(ctl, &request, sizeof(request), TB_CFG_PKG_RESET);
|
|
if (err)
|
|
return (struct tb_cfg_result) { .err = err };
|
|
|
|
return tb_ctl_rx(ctl, &reply, sizeof(reply), timeout_msec, route,
|
|
TB_CFG_PKG_RESET);
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_read() - read from config space into buffer
|
|
*
|
|
* Offset and length are in dwords.
|
|
*/
|
|
struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,
|
|
u64 route, u32 port, enum tb_cfg_space space,
|
|
u32 offset, u32 length, int timeout_msec)
|
|
{
|
|
struct tb_cfg_result res = { 0 };
|
|
struct cfg_read_pkg request = {
|
|
.header = make_header(route),
|
|
.addr = {
|
|
.port = port,
|
|
.space = space,
|
|
.offset = offset,
|
|
.length = length,
|
|
},
|
|
};
|
|
struct cfg_write_pkg reply;
|
|
|
|
res.err = tb_ctl_tx(ctl, &request, sizeof(request), TB_CFG_PKG_READ);
|
|
if (res.err)
|
|
return res;
|
|
|
|
res = tb_ctl_rx(ctl, &reply, 12 + 4 * length, timeout_msec, route,
|
|
TB_CFG_PKG_READ);
|
|
if (res.err)
|
|
return res;
|
|
|
|
res.response_port = reply.addr.port;
|
|
res.err = check_config_address(reply.addr, space, offset, length);
|
|
if (!res.err)
|
|
memcpy(buffer, &reply.data, 4 * length);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_write() - write from buffer into config space
|
|
*
|
|
* Offset and length are in dwords.
|
|
*/
|
|
struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, void *buffer,
|
|
u64 route, u32 port, enum tb_cfg_space space,
|
|
u32 offset, u32 length, int timeout_msec)
|
|
{
|
|
struct tb_cfg_result res = { 0 };
|
|
struct cfg_write_pkg request = {
|
|
.header = make_header(route),
|
|
.addr = {
|
|
.port = port,
|
|
.space = space,
|
|
.offset = offset,
|
|
.length = length,
|
|
},
|
|
};
|
|
struct cfg_read_pkg reply;
|
|
|
|
memcpy(&request.data, buffer, length * 4);
|
|
|
|
res.err = tb_ctl_tx(ctl, &request, 12 + 4 * length, TB_CFG_PKG_WRITE);
|
|
if (res.err)
|
|
return res;
|
|
|
|
res = tb_ctl_rx(ctl, &reply, sizeof(reply), timeout_msec, route,
|
|
TB_CFG_PKG_WRITE);
|
|
if (res.err)
|
|
return res;
|
|
|
|
res.response_port = reply.addr.port;
|
|
res.err = check_config_address(reply.addr, space, offset, length);
|
|
return res;
|
|
}
|
|
|
|
int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
|
|
enum tb_cfg_space space, u32 offset, u32 length)
|
|
{
|
|
struct tb_cfg_result res = tb_cfg_read_raw(ctl, buffer, route, port,
|
|
space, offset, length, TB_CFG_DEFAULT_TIMEOUT);
|
|
if (res.err == 1) {
|
|
tb_cfg_print_error(ctl, &res);
|
|
return -EIO;
|
|
}
|
|
WARN(res.err, "tb_cfg_read: %d\n", res.err);
|
|
return res.err;
|
|
}
|
|
|
|
int tb_cfg_write(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
|
|
enum tb_cfg_space space, u32 offset, u32 length)
|
|
{
|
|
struct tb_cfg_result res = tb_cfg_write_raw(ctl, buffer, route, port,
|
|
space, offset, length, TB_CFG_DEFAULT_TIMEOUT);
|
|
if (res.err == 1) {
|
|
tb_cfg_print_error(ctl, &res);
|
|
return -EIO;
|
|
}
|
|
WARN(res.err, "tb_cfg_write: %d\n", res.err);
|
|
return res.err;
|
|
}
|
|
|
|
/**
|
|
* tb_cfg_get_upstream_port() - get upstream port number of switch at route
|
|
*
|
|
* Reads the first dword from the switches TB_CFG_SWITCH config area and
|
|
* returns the port number from which the reply originated.
|
|
*
|
|
* Return: Returns the upstream port number on success or an error code on
|
|
* failure.
|
|
*/
|
|
int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route)
|
|
{
|
|
u32 dummy;
|
|
struct tb_cfg_result res = tb_cfg_read_raw(ctl, &dummy, route, 0,
|
|
TB_CFG_SWITCH, 0, 1,
|
|
TB_CFG_DEFAULT_TIMEOUT);
|
|
if (res.err == 1)
|
|
return -EIO;
|
|
if (res.err)
|
|
return res.err;
|
|
return res.response_port;
|
|
}
|