Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox updates from Jassi Brar: - a TI specific quirk to get CPU control working via remote master. - a new mailbox driver for an ST platform. - a generic test driver to aid new driver development. And a couple of fixes to make that really clean. * 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration: mailbox: mailbox-test: avoid reading iomem twice mailbox: Off by one in mbox_test_message_read() mailbox/omap: Add ti,mbox-send-noirq quirk to fix AM33xx CPU Idle mailbox: mailbox-test: Correctly repair Sparse warnings mailbox: Fix a couple of trivial static checker issues mailbox: Add generic mechanism for testing Mailbox Controllers mailbox: Add support for ST's Mailbox IP mailbox: dt: Supply bindings for ST's Mailbox IP PCC: fix dereference of ERR_PTR
This commit is contained in:
Linus Torvalds
Коммит
2d49dcb9e4
|
|
@ -75,6 +75,14 @@ data that represent the following:
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|||
Cell #3 (usr_id) - mailbox user id for identifying the interrupt line
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||||
associated with generating a tx/rx fifo interrupt.
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||||
Optional Properties:
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--------------------
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- ti,mbox-send-noirq: Quirk flag to allow the client user of this sub-mailbox
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||||
to send messages without triggering a Tx ready interrupt,
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and to control the Tx ticker. Should be used only on
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sub-mailboxes used to communicate with WkupM3 remote
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processor on AM33xx/AM43xx SoCs.
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Mailbox Users:
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==============
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A device needing to communicate with a target processor device should specify
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|
|
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@ -0,0 +1,51 @@
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ST Microelectronics Mailbox Driver
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Each ST Mailbox IP currently consists of 4 instances of 32 channels. Messages
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are passed between Application and Remote processors using shared memory.
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Controller
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----------
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Required properties:
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- compatible : Should be "st,stih407-mailbox"
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- reg : Offset and length of the device's register set
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- mbox-name : Name of the mailbox
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- #mbox-cells: : Must be 2
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<&phandle instance channel direction>
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phandle : Label name of controller
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instance : Instance number
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channel : Channel number
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Optional properties
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- interrupts : Contains the IRQ line for a Rx mailbox
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Example:
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mailbox0: mailbox@0 {
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compatible = "st,stih407-mailbox";
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reg = <0x08f00000 0x1000>;
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interrupts = <GIC_SPI 1 IRQ_TYPE_NONE>;
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#mbox-cells = <2>;
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mbox-name = "a9";
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};
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Client
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------
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Required properties:
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- compatible : Many (See the client docs)
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- reg : Shared (between Application and Remote) memory address
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- mboxes : Standard property to specify a Mailbox (See ./mailbox.txt)
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Cells must match 'mbox-cells' (See Controller docs above)
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Optional properties
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- mbox-names : Name given to channels seen in the 'mboxes' property.
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Example:
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mailbox_test {
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compatible = "mailbox_test";
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reg = <0x[shared_memory_address], [shared_memory_size]>;
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mboxes = <&mailbox2 0 1>, <&mailbox0 2 1>;
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mbox-names = "tx", "rx";
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};
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@ -71,4 +71,18 @@ config BCM2835_MBOX
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the services of the Videocore. Say Y here if you want to use the
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BCM2835 Mailbox.
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config STI_MBOX
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tristate "STI Mailbox framework support"
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depends on ARCH_STI && OF
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help
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Mailbox implementation for STMicroelectonics family chips with
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hardware for interprocessor communication.
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config MAILBOX_TEST
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tristate "Mailbox Test Client"
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depends on OF
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help
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Test client to help with testing new Controller driver
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implementations.
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endif
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|
|
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@ -2,6 +2,8 @@
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obj-$(CONFIG_MAILBOX) += mailbox.o
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obj-$(CONFIG_MAILBOX_TEST) += mailbox-test.o
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obj-$(CONFIG_ARM_MHU) += arm_mhu.o
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obj-$(CONFIG_PL320_MBOX) += pl320-ipc.o
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@ -13,3 +15,5 @@ obj-$(CONFIG_PCC) += pcc.o
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obj-$(CONFIG_ALTERA_MBOX) += mailbox-altera.o
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obj-$(CONFIG_BCM2835_MBOX) += bcm2835-mailbox.o
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obj-$(CONFIG_STI_MBOX) += mailbox-sti.o
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|
|
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|
@ -0,0 +1,513 @@
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/*
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* STi Mailbox
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*
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* Copyright (C) 2015 ST Microelectronics
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*
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* Author: Lee Jones <lee.jones@linaro.org> for ST Microelectronics
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*
|
||||
* Based on the original driver written by;
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* Alexandre Torgue, Olivier Lebreton and Loic Pallardy
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*
|
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* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*/
|
||||
|
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/mailbox_controller.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "mailbox.h"
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#define STI_MBOX_INST_MAX 4 /* RAM saving: Max supported instances */
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#define STI_MBOX_CHAN_MAX 20 /* RAM saving: Max supported channels */
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#define STI_IRQ_VAL_OFFSET 0x04 /* Read interrupt status */
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#define STI_IRQ_SET_OFFSET 0x24 /* Generate a Tx channel interrupt */
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#define STI_IRQ_CLR_OFFSET 0x44 /* Clear pending Rx interrupts */
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#define STI_ENA_VAL_OFFSET 0x64 /* Read enable status */
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#define STI_ENA_SET_OFFSET 0x84 /* Enable a channel */
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#define STI_ENA_CLR_OFFSET 0xa4 /* Disable a channel */
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#define MBOX_BASE(mdev, inst) ((mdev)->base + ((inst) * 4))
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/**
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* STi Mailbox device data
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*
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* An IP Mailbox is currently composed of 4 instances
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* Each instance is currently composed of 32 channels
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* This means that we have 128 channels per Mailbox
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* A channel an be used for TX or RX
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*
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* @dev: Device to which it is attached
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* @mbox: Representation of a communication channel controller
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* @base: Base address of the register mapping region
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* @name: Name of the mailbox
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* @enabled: Local copy of enabled channels
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* @lock: Mutex protecting enabled status
|
||||
*/
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struct sti_mbox_device {
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struct device *dev;
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struct mbox_controller *mbox;
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void __iomem *base;
|
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const char *name;
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||||
u32 enabled[STI_MBOX_INST_MAX];
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spinlock_t lock;
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};
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/**
|
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* STi Mailbox platform specific configuration
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*
|
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* @num_inst: Maximum number of instances in one HW Mailbox
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* @num_chan: Maximum number of channel per instance
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*/
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struct sti_mbox_pdata {
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unsigned int num_inst;
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unsigned int num_chan;
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||||
};
|
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|
||||
/**
|
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* STi Mailbox allocated channel information
|
||||
*
|
||||
* @mdev: Pointer to parent Mailbox device
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* @instance: Instance number channel resides in
|
||||
* @channel: Channel number pertaining to this container
|
||||
*/
|
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struct sti_channel {
|
||||
struct sti_mbox_device *mdev;
|
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unsigned int instance;
|
||||
unsigned int channel;
|
||||
};
|
||||
|
||||
static inline bool sti_mbox_channel_is_enabled(struct mbox_chan *chan)
|
||||
{
|
||||
struct sti_channel *chan_info = chan->con_priv;
|
||||
struct sti_mbox_device *mdev = chan_info->mdev;
|
||||
unsigned int instance = chan_info->instance;
|
||||
unsigned int channel = chan_info->channel;
|
||||
|
||||
return mdev->enabled[instance] & BIT(channel);
|
||||
}
|
||||
|
||||
static inline
|
||||
struct mbox_chan *sti_mbox_to_channel(struct mbox_controller *mbox,
|
||||
unsigned int instance,
|
||||
unsigned int channel)
|
||||
{
|
||||
struct sti_channel *chan_info;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < mbox->num_chans; i++) {
|
||||
chan_info = mbox->chans[i].con_priv;
|
||||
if (chan_info &&
|
||||
chan_info->instance == instance &&
|
||||
chan_info->channel == channel)
|
||||
return &mbox->chans[i];
|
||||
}
|
||||
|
||||
dev_err(mbox->dev,
|
||||
"Channel not registered: instance: %d channel: %d\n",
|
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instance, channel);
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void sti_mbox_enable_channel(struct mbox_chan *chan)
|
||||
{
|
||||
struct sti_channel *chan_info = chan->con_priv;
|
||||
struct sti_mbox_device *mdev = chan_info->mdev;
|
||||
unsigned int instance = chan_info->instance;
|
||||
unsigned int channel = chan_info->channel;
|
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unsigned long flags;
|
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void __iomem *base = MBOX_BASE(mdev, instance);
|
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|
||||
spin_lock_irqsave(&mdev->lock, flags);
|
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mdev->enabled[instance] |= BIT(channel);
|
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writel_relaxed(BIT(channel), base + STI_ENA_SET_OFFSET);
|
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spin_unlock_irqrestore(&mdev->lock, flags);
|
||||
}
|
||||
|
||||
static void sti_mbox_disable_channel(struct mbox_chan *chan)
|
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{
|
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struct sti_channel *chan_info = chan->con_priv;
|
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struct sti_mbox_device *mdev = chan_info->mdev;
|
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unsigned int instance = chan_info->instance;
|
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unsigned int channel = chan_info->channel;
|
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unsigned long flags;
|
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void __iomem *base = MBOX_BASE(mdev, instance);
|
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|
||||
spin_lock_irqsave(&mdev->lock, flags);
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mdev->enabled[instance] &= ~BIT(channel);
|
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writel_relaxed(BIT(channel), base + STI_ENA_CLR_OFFSET);
|
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spin_unlock_irqrestore(&mdev->lock, flags);
|
||||
}
|
||||
|
||||
static void sti_mbox_clear_irq(struct mbox_chan *chan)
|
||||
{
|
||||
struct sti_channel *chan_info = chan->con_priv;
|
||||
struct sti_mbox_device *mdev = chan_info->mdev;
|
||||
unsigned int instance = chan_info->instance;
|
||||
unsigned int channel = chan_info->channel;
|
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void __iomem *base = MBOX_BASE(mdev, instance);
|
||||
|
||||
writel_relaxed(BIT(channel), base + STI_IRQ_CLR_OFFSET);
|
||||
}
|
||||
|
||||
static struct mbox_chan *sti_mbox_irq_to_channel(struct sti_mbox_device *mdev,
|
||||
unsigned int instance)
|
||||
{
|
||||
struct mbox_controller *mbox = mdev->mbox;
|
||||
struct mbox_chan *chan = NULL;
|
||||
unsigned int channel;
|
||||
unsigned long bits;
|
||||
void __iomem *base = MBOX_BASE(mdev, instance);
|
||||
|
||||
bits = readl_relaxed(base + STI_IRQ_VAL_OFFSET);
|
||||
if (!bits)
|
||||
/* No IRQs fired in specified instance */
|
||||
return NULL;
|
||||
|
||||
/* An IRQ has fired, find the associated channel */
|
||||
for (channel = 0; bits; channel++) {
|
||||
if (!test_and_clear_bit(channel, &bits))
|
||||
continue;
|
||||
|
||||
chan = sti_mbox_to_channel(mbox, instance, channel);
|
||||
if (chan) {
|
||||
dev_dbg(mbox->dev,
|
||||
"IRQ fired on instance: %d channel: %d\n",
|
||||
instance, channel);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return chan;
|
||||
}
|
||||
|
||||
static irqreturn_t sti_mbox_thread_handler(int irq, void *data)
|
||||
{
|
||||
struct sti_mbox_device *mdev = data;
|
||||
struct sti_mbox_pdata *pdata = dev_get_platdata(mdev->dev);
|
||||
struct mbox_chan *chan;
|
||||
unsigned int instance;
|
||||
|
||||
for (instance = 0; instance < pdata->num_inst; instance++) {
|
||||
keep_looking:
|
||||
chan = sti_mbox_irq_to_channel(mdev, instance);
|
||||
if (!chan)
|
||||
continue;
|
||||
|
||||
mbox_chan_received_data(chan, NULL);
|
||||
sti_mbox_clear_irq(chan);
|
||||
sti_mbox_enable_channel(chan);
|
||||
goto keep_looking;
|
||||
}
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static irqreturn_t sti_mbox_irq_handler(int irq, void *data)
|
||||
{
|
||||
struct sti_mbox_device *mdev = data;
|
||||
struct sti_mbox_pdata *pdata = dev_get_platdata(mdev->dev);
|
||||
struct sti_channel *chan_info;
|
||||
struct mbox_chan *chan;
|
||||
unsigned int instance;
|
||||
int ret = IRQ_NONE;
|
||||
|
||||
for (instance = 0; instance < pdata->num_inst; instance++) {
|
||||
chan = sti_mbox_irq_to_channel(mdev, instance);
|
||||
if (!chan)
|
||||
continue;
|
||||
chan_info = chan->con_priv;
|
||||
|
||||
if (!sti_mbox_channel_is_enabled(chan)) {
|
||||
dev_warn(mdev->dev,
|
||||
"Unexpected IRQ: %s\n"
|
||||
" instance: %d: channel: %d [enabled: %x]\n",
|
||||
mdev->name, chan_info->instance,
|
||||
chan_info->channel, mdev->enabled[instance]);
|
||||
|
||||
/* Only handle IRQ if no other valid IRQs were found */
|
||||
if (ret == IRQ_NONE)
|
||||
ret = IRQ_HANDLED;
|
||||
continue;
|
||||
}
|
||||
|
||||
sti_mbox_disable_channel(chan);
|
||||
ret = IRQ_WAKE_THREAD;
|
||||
}
|
||||
|
||||
if (ret == IRQ_NONE)
|
||||
dev_err(mdev->dev, "Spurious IRQ - was a channel requested?\n");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static bool sti_mbox_tx_is_ready(struct mbox_chan *chan)
|
||||
{
|
||||
struct sti_channel *chan_info = chan->con_priv;
|
||||
struct sti_mbox_device *mdev = chan_info->mdev;
|
||||
unsigned int instance = chan_info->instance;
|
||||
unsigned int channel = chan_info->channel;
|
||||
void __iomem *base = MBOX_BASE(mdev, instance);
|
||||
|
||||
if (!(readl_relaxed(base + STI_ENA_VAL_OFFSET) & BIT(channel))) {
|
||||
dev_dbg(mdev->dev, "Mbox: %s: inst: %d, chan: %d disabled\n",
|
||||
mdev->name, instance, channel);
|
||||
return false;
|
||||
}
|
||||
|
||||
if (readl_relaxed(base + STI_IRQ_VAL_OFFSET) & BIT(channel)) {
|
||||
dev_dbg(mdev->dev, "Mbox: %s: inst: %d, chan: %d not ready\n",
|
||||
mdev->name, instance, channel);
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static int sti_mbox_send_data(struct mbox_chan *chan, void *data)
|
||||
{
|
||||
struct sti_channel *chan_info = chan->con_priv;
|
||||
struct sti_mbox_device *mdev = chan_info->mdev;
|
||||
unsigned int instance = chan_info->instance;
|
||||
unsigned int channel = chan_info->channel;
|
||||
void __iomem *base = MBOX_BASE(mdev, instance);
|
||||
|
||||
/* Send event to co-processor */
|
||||
writel_relaxed(BIT(channel), base + STI_IRQ_SET_OFFSET);
|
||||
|
||||
dev_dbg(mdev->dev,
|
||||
"Sent via Mailbox %s: instance: %d channel: %d\n",
|
||||
mdev->name, instance, channel);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sti_mbox_startup_chan(struct mbox_chan *chan)
|
||||
{
|
||||
sti_mbox_clear_irq(chan);
|
||||
sti_mbox_enable_channel(chan);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void sti_mbox_shutdown_chan(struct mbox_chan *chan)
|
||||
{
|
||||
struct sti_channel *chan_info = chan->con_priv;
|
||||
struct mbox_controller *mbox = chan_info->mdev->mbox;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < mbox->num_chans; i++)
|
||||
if (chan == &mbox->chans[i])
|
||||
break;
|
||||
|
||||
if (mbox->num_chans == i) {
|
||||
dev_warn(mbox->dev, "Request to free non-existent channel\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/* Reset channel */
|
||||
sti_mbox_disable_channel(chan);
|
||||
sti_mbox_clear_irq(chan);
|
||||
chan->con_priv = NULL;
|
||||
}
|
||||
|
||||
static struct mbox_chan *sti_mbox_xlate(struct mbox_controller *mbox,
|
||||
const struct of_phandle_args *spec)
|
||||
{
|
||||
struct sti_mbox_device *mdev = dev_get_drvdata(mbox->dev);
|
||||
struct sti_mbox_pdata *pdata = dev_get_platdata(mdev->dev);
|
||||
struct sti_channel *chan_info;
|
||||
struct mbox_chan *chan = NULL;
|
||||
unsigned int instance = spec->args[0];
|
||||
unsigned int channel = spec->args[1];
|
||||
int i;
|
||||
|
||||
/* Bounds checking */
|
||||
if (instance >= pdata->num_inst || channel >= pdata->num_chan) {
|
||||
dev_err(mbox->dev,
|
||||
"Invalid channel requested instance: %d channel: %d\n",
|
||||
instance, channel);
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
|
||||
for (i = 0; i < mbox->num_chans; i++) {
|
||||
chan_info = mbox->chans[i].con_priv;
|
||||
|
||||
/* Is requested channel free? */
|
||||
if (chan_info &&
|
||||
mbox->dev == chan_info->mdev->dev &&
|
||||
instance == chan_info->instance &&
|
||||
channel == chan_info->channel) {
|
||||
|
||||
dev_err(mbox->dev, "Channel in use\n");
|
||||
return ERR_PTR(-EBUSY);
|
||||
}
|
||||
|
||||
/*
|
||||
* Find the first free slot, then continue checking
|
||||
* to see if requested channel is in use
|
||||
*/
|
||||
if (!chan && !chan_info)
|
||||
chan = &mbox->chans[i];
|
||||
}
|
||||
|
||||
if (!chan) {
|
||||
dev_err(mbox->dev, "No free channels left\n");
|
||||
return ERR_PTR(-EBUSY);
|
||||
}
|
||||
|
||||
chan_info = devm_kzalloc(mbox->dev, sizeof(*chan_info), GFP_KERNEL);
|
||||
if (!chan_info)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
chan_info->mdev = mdev;
|
||||
chan_info->instance = instance;
|
||||
chan_info->channel = channel;
|
||||
|
||||
chan->con_priv = chan_info;
|
||||
|
||||
dev_info(mbox->dev,
|
||||
"Mbox: %s: Created channel: instance: %d channel: %d\n",
|
||||
mdev->name, instance, channel);
|
||||
|
||||
return chan;
|
||||
}
|
||||
|
||||
static struct mbox_chan_ops sti_mbox_ops = {
|
||||
.startup = sti_mbox_startup_chan,
|
||||
.shutdown = sti_mbox_shutdown_chan,
|
||||
.send_data = sti_mbox_send_data,
|
||||
.last_tx_done = sti_mbox_tx_is_ready,
|
||||
};
|
||||
|
||||
static const struct sti_mbox_pdata mbox_stih407_pdata = {
|
||||
.num_inst = 4,
|
||||
.num_chan = 32,
|
||||
};
|
||||
|
||||
static const struct of_device_id sti_mailbox_match[] = {
|
||||
{
|
||||
.compatible = "st,stih407-mailbox",
|
||||
.data = (void *)&mbox_stih407_pdata
|
||||
},
|
||||
{ }
|
||||
};
|
||||
|
||||
static int sti_mbox_probe(struct platform_device *pdev)
|
||||
{
|
||||
const struct of_device_id *match;
|
||||
struct mbox_controller *mbox;
|
||||
struct sti_mbox_device *mdev;
|
||||
struct device_node *np = pdev->dev.of_node;
|
||||
struct mbox_chan *chans;
|
||||
struct resource *res;
|
||||
int irq;
|
||||
int ret;
|
||||
|
||||
match = of_match_device(sti_mailbox_match, &pdev->dev);
|
||||
if (!match) {
|
||||
dev_err(&pdev->dev, "No configuration found\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
pdev->dev.platform_data = (struct sti_mbox_pdata *) match->data;
|
||||
|
||||
mdev = devm_kzalloc(&pdev->dev, sizeof(*mdev), GFP_KERNEL);
|
||||
if (!mdev)
|
||||
return -ENOMEM;
|
||||
|
||||
platform_set_drvdata(pdev, mdev);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
mdev->base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (!mdev->base)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = of_property_read_string(np, "mbox-name", &mdev->name);
|
||||
if (ret)
|
||||
mdev->name = np->full_name;
|
||||
|
||||
mbox = devm_kzalloc(&pdev->dev, sizeof(*mbox), GFP_KERNEL);
|
||||
if (!mbox)
|
||||
return -ENOMEM;
|
||||
|
||||
chans = devm_kzalloc(&pdev->dev,
|
||||
sizeof(*chans) * STI_MBOX_CHAN_MAX, GFP_KERNEL);
|
||||
if (!chans)
|
||||
return -ENOMEM;
|
||||
|
||||
mdev->dev = &pdev->dev;
|
||||
mdev->mbox = mbox;
|
||||
|
||||
spin_lock_init(&mdev->lock);
|
||||
|
||||
/* STi Mailbox does not have a Tx-Done or Tx-Ready IRQ */
|
||||
mbox->txdone_irq = false;
|
||||
mbox->txdone_poll = true;
|
||||
mbox->txpoll_period = 100;
|
||||
mbox->ops = &sti_mbox_ops;
|
||||
mbox->dev = mdev->dev;
|
||||
mbox->of_xlate = sti_mbox_xlate;
|
||||
mbox->chans = chans;
|
||||
mbox->num_chans = STI_MBOX_CHAN_MAX;
|
||||
|
||||
ret = mbox_controller_register(mbox);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* It's okay for Tx Mailboxes to not supply IRQs */
|
||||
irq = platform_get_irq(pdev, 0);
|
||||
if (irq < 0) {
|
||||
dev_info(&pdev->dev,
|
||||
"%s: Registered Tx only Mailbox\n", mdev->name);
|
||||
return 0;
|
||||
}
|
||||
|
||||
ret = devm_request_threaded_irq(&pdev->dev, irq,
|
||||
sti_mbox_irq_handler,
|
||||
sti_mbox_thread_handler,
|
||||
IRQF_ONESHOT, mdev->name, mdev);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "Can't claim IRQ %d\n", irq);
|
||||
mbox_controller_unregister(mbox);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
dev_info(&pdev->dev, "%s: Registered Tx/Rx Mailbox\n", mdev->name);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sti_mbox_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct sti_mbox_device *mdev = platform_get_drvdata(pdev);
|
||||
|
||||
mbox_controller_unregister(mdev->mbox);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver sti_mbox_driver = {
|
||||
.probe = sti_mbox_probe,
|
||||
.remove = sti_mbox_remove,
|
||||
.driver = {
|
||||
.name = "sti-mailbox",
|
||||
.of_match_table = sti_mailbox_match,
|
||||
},
|
||||
};
|
||||
module_platform_driver(sti_mbox_driver);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("STMicroelectronics Mailbox Controller");
|
||||
MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org");
|
||||
MODULE_ALIAS("platform:mailbox-sti");
|
||||
|
|
@ -0,0 +1,361 @@
|
|||
/*
|
||||
* Copyright (C) 2015 ST Microelectronics
|
||||
*
|
||||
* Author: Lee Jones <lee.jones@linaro.org>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*/
|
||||
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/mailbox_client.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/uaccess.h>
|
||||
|
||||
#define MBOX_MAX_SIG_LEN 8
|
||||
#define MBOX_MAX_MSG_LEN 128
|
||||
#define MBOX_BYTES_PER_LINE 16
|
||||
#define MBOX_HEXDUMP_LINE_LEN ((MBOX_BYTES_PER_LINE * 4) + 2)
|
||||
#define MBOX_HEXDUMP_MAX_LEN (MBOX_HEXDUMP_LINE_LEN * \
|
||||
(MBOX_MAX_MSG_LEN / MBOX_BYTES_PER_LINE))
|
||||
|
||||
static struct dentry *root_debugfs_dir;
|
||||
|
||||
struct mbox_test_device {
|
||||
struct device *dev;
|
||||
void __iomem *mmio;
|
||||
struct mbox_chan *tx_channel;
|
||||
struct mbox_chan *rx_channel;
|
||||
char *rx_buffer;
|
||||
char *signal;
|
||||
char *message;
|
||||
spinlock_t lock;
|
||||
};
|
||||
|
||||
static ssize_t mbox_test_signal_write(struct file *filp,
|
||||
const char __user *userbuf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
struct mbox_test_device *tdev = filp->private_data;
|
||||
int ret;
|
||||
|
||||
if (!tdev->tx_channel) {
|
||||
dev_err(tdev->dev, "Channel cannot do Tx\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (count > MBOX_MAX_SIG_LEN) {
|
||||
dev_err(tdev->dev,
|
||||
"Signal length %zd greater than max allowed %d\n",
|
||||
count, MBOX_MAX_SIG_LEN);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL);
|
||||
if (!tdev->signal)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = copy_from_user(tdev->signal, userbuf, count);
|
||||
if (ret) {
|
||||
kfree(tdev->signal);
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
return ret < 0 ? ret : count;
|
||||
}
|
||||
|
||||
static const struct file_operations mbox_test_signal_ops = {
|
||||
.write = mbox_test_signal_write,
|
||||
.open = simple_open,
|
||||
.llseek = generic_file_llseek,
|
||||
};
|
||||
|
||||
static ssize_t mbox_test_message_write(struct file *filp,
|
||||
const char __user *userbuf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
struct mbox_test_device *tdev = filp->private_data;
|
||||
void *data;
|
||||
int ret;
|
||||
|
||||
if (!tdev->tx_channel) {
|
||||
dev_err(tdev->dev, "Channel cannot do Tx\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (count > MBOX_MAX_MSG_LEN) {
|
||||
dev_err(tdev->dev,
|
||||
"Message length %zd greater than max allowed %d\n",
|
||||
count, MBOX_MAX_MSG_LEN);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
tdev->message = kzalloc(MBOX_MAX_MSG_LEN, GFP_KERNEL);
|
||||
if (!tdev->message)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = copy_from_user(tdev->message, userbuf, count);
|
||||
if (ret) {
|
||||
ret = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* A separate signal is only of use if there is
|
||||
* MMIO to subsequently pass the message through
|
||||
*/
|
||||
if (tdev->mmio && tdev->signal) {
|
||||
print_hex_dump(KERN_INFO, "Client: Sending: Signal: ", DUMP_PREFIX_ADDRESS,
|
||||
MBOX_BYTES_PER_LINE, 1, tdev->signal, MBOX_MAX_SIG_LEN, true);
|
||||
|
||||
data = tdev->signal;
|
||||
} else
|
||||
data = tdev->message;
|
||||
|
||||
print_hex_dump(KERN_INFO, "Client: Sending: Message: ", DUMP_PREFIX_ADDRESS,
|
||||
MBOX_BYTES_PER_LINE, 1, tdev->message, MBOX_MAX_MSG_LEN, true);
|
||||
|
||||
ret = mbox_send_message(tdev->tx_channel, data);
|
||||
if (ret < 0)
|
||||
dev_err(tdev->dev, "Failed to send message via mailbox\n");
|
||||
|
||||
out:
|
||||
kfree(tdev->signal);
|
||||
kfree(tdev->message);
|
||||
|
||||
return ret < 0 ? ret : count;
|
||||
}
|
||||
|
||||
static ssize_t mbox_test_message_read(struct file *filp, char __user *userbuf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
struct mbox_test_device *tdev = filp->private_data;
|
||||
unsigned long flags;
|
||||
char *touser, *ptr;
|
||||
int l = 0;
|
||||
int ret;
|
||||
|
||||
touser = kzalloc(MBOX_HEXDUMP_MAX_LEN + 1, GFP_KERNEL);
|
||||
if (!touser)
|
||||
return -ENOMEM;
|
||||
|
||||
if (!tdev->rx_channel) {
|
||||
ret = snprintf(touser, 20, "<NO RX CAPABILITY>\n");
|
||||
ret = simple_read_from_buffer(userbuf, count, ppos,
|
||||
touser, ret);
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (tdev->rx_buffer[0] == '\0') {
|
||||
ret = snprintf(touser, 9, "<EMPTY>\n");
|
||||
ret = simple_read_from_buffer(userbuf, count, ppos,
|
||||
touser, ret);
|
||||
goto out;
|
||||
}
|
||||
|
||||
spin_lock_irqsave(&tdev->lock, flags);
|
||||
|
||||
ptr = tdev->rx_buffer;
|
||||
while (l < MBOX_HEXDUMP_MAX_LEN) {
|
||||
hex_dump_to_buffer(ptr,
|
||||
MBOX_BYTES_PER_LINE,
|
||||
MBOX_BYTES_PER_LINE, 1, touser + l,
|
||||
MBOX_HEXDUMP_LINE_LEN, true);
|
||||
|
||||
ptr += MBOX_BYTES_PER_LINE;
|
||||
l += MBOX_HEXDUMP_LINE_LEN;
|
||||
*(touser + (l - 1)) = '\n';
|
||||
}
|
||||
*(touser + l) = '\0';
|
||||
|
||||
memset(tdev->rx_buffer, 0, MBOX_MAX_MSG_LEN);
|
||||
|
||||
spin_unlock_irqrestore(&tdev->lock, flags);
|
||||
|
||||
ret = simple_read_from_buffer(userbuf, count, ppos, touser, MBOX_HEXDUMP_MAX_LEN);
|
||||
out:
|
||||
kfree(touser);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct file_operations mbox_test_message_ops = {
|
||||
.write = mbox_test_message_write,
|
||||
.read = mbox_test_message_read,
|
||||
.open = simple_open,
|
||||
.llseek = generic_file_llseek,
|
||||
};
|
||||
|
||||
static int mbox_test_add_debugfs(struct platform_device *pdev,
|
||||
struct mbox_test_device *tdev)
|
||||
{
|
||||
if (!debugfs_initialized())
|
||||
return 0;
|
||||
|
||||
root_debugfs_dir = debugfs_create_dir("mailbox", NULL);
|
||||
if (!root_debugfs_dir) {
|
||||
dev_err(&pdev->dev, "Failed to create Mailbox debugfs\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
debugfs_create_file("message", 0600, root_debugfs_dir,
|
||||
tdev, &mbox_test_message_ops);
|
||||
|
||||
debugfs_create_file("signal", 0200, root_debugfs_dir,
|
||||
tdev, &mbox_test_signal_ops);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void mbox_test_receive_message(struct mbox_client *client, void *message)
|
||||
{
|
||||
struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&tdev->lock, flags);
|
||||
if (tdev->mmio) {
|
||||
memcpy_fromio(tdev->rx_buffer, tdev->mmio, MBOX_MAX_MSG_LEN);
|
||||
print_hex_dump(KERN_INFO, "Client: Received [MMIO]: ",
|
||||
DUMP_PREFIX_ADDRESS, MBOX_BYTES_PER_LINE, 1,
|
||||
tdev->rx_buffer, MBOX_MAX_MSG_LEN, true);
|
||||
} else if (message) {
|
||||
print_hex_dump(KERN_INFO, "Client: Received [API]: ",
|
||||
DUMP_PREFIX_ADDRESS, MBOX_BYTES_PER_LINE, 1,
|
||||
message, MBOX_MAX_MSG_LEN, true);
|
||||
memcpy(tdev->rx_buffer, message, MBOX_MAX_MSG_LEN);
|
||||
}
|
||||
spin_unlock_irqrestore(&tdev->lock, flags);
|
||||
}
|
||||
|
||||
static void mbox_test_prepare_message(struct mbox_client *client, void *message)
|
||||
{
|
||||
struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
|
||||
|
||||
if (tdev->mmio) {
|
||||
if (tdev->signal)
|
||||
memcpy_toio(tdev->mmio, tdev->message, MBOX_MAX_MSG_LEN);
|
||||
else
|
||||
memcpy_toio(tdev->mmio, message, MBOX_MAX_MSG_LEN);
|
||||
}
|
||||
}
|
||||
|
||||
static void mbox_test_message_sent(struct mbox_client *client,
|
||||
void *message, int r)
|
||||
{
|
||||
if (r)
|
||||
dev_warn(client->dev,
|
||||
"Client: Message could not be sent: %d\n", r);
|
||||
else
|
||||
dev_info(client->dev,
|
||||
"Client: Message sent\n");
|
||||
}
|
||||
|
||||
static struct mbox_chan *
|
||||
mbox_test_request_channel(struct platform_device *pdev, const char *name)
|
||||
{
|
||||
struct mbox_client *client;
|
||||
struct mbox_chan *channel;
|
||||
|
||||
client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
|
||||
if (!client)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
client->dev = &pdev->dev;
|
||||
client->rx_callback = mbox_test_receive_message;
|
||||
client->tx_prepare = mbox_test_prepare_message;
|
||||
client->tx_done = mbox_test_message_sent;
|
||||
client->tx_block = true;
|
||||
client->knows_txdone = false;
|
||||
client->tx_tout = 500;
|
||||
|
||||
channel = mbox_request_channel_byname(client, name);
|
||||
if (IS_ERR(channel)) {
|
||||
dev_warn(&pdev->dev, "Failed to request %s channel\n", name);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return channel;
|
||||
}
|
||||
|
||||
static int mbox_test_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct mbox_test_device *tdev;
|
||||
struct resource *res;
|
||||
int ret;
|
||||
|
||||
tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
|
||||
if (!tdev)
|
||||
return -ENOMEM;
|
||||
|
||||
/* It's okay for MMIO to be NULL */
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
tdev->mmio = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(tdev->mmio))
|
||||
tdev->mmio = NULL;
|
||||
|
||||
tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
|
||||
tdev->rx_channel = mbox_test_request_channel(pdev, "rx");
|
||||
|
||||
if (!tdev->tx_channel && !tdev->rx_channel)
|
||||
return -EPROBE_DEFER;
|
||||
|
||||
tdev->dev = &pdev->dev;
|
||||
platform_set_drvdata(pdev, tdev);
|
||||
|
||||
spin_lock_init(&tdev->lock);
|
||||
|
||||
if (tdev->rx_channel) {
|
||||
tdev->rx_buffer = devm_kzalloc(&pdev->dev,
|
||||
MBOX_MAX_MSG_LEN, GFP_KERNEL);
|
||||
if (!tdev->rx_buffer)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
ret = mbox_test_add_debugfs(pdev, tdev);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
dev_info(&pdev->dev, "Successfully registered\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mbox_test_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct mbox_test_device *tdev = platform_get_drvdata(pdev);
|
||||
|
||||
debugfs_remove_recursive(root_debugfs_dir);
|
||||
|
||||
if (tdev->tx_channel)
|
||||
mbox_free_channel(tdev->tx_channel);
|
||||
if (tdev->rx_channel)
|
||||
mbox_free_channel(tdev->rx_channel);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id mbox_test_match[] = {
|
||||
{ .compatible = "mailbox_test" },
|
||||
{},
|
||||
};
|
||||
|
||||
static struct platform_driver mbox_test_driver = {
|
||||
.driver = {
|
||||
.name = "mailbox_sti_test",
|
||||
.of_match_table = mbox_test_match,
|
||||
},
|
||||
.probe = mbox_test_probe,
|
||||
.remove = mbox_test_remove,
|
||||
};
|
||||
module_platform_driver(mbox_test_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Generic Mailbox Testing Facility");
|
||||
MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -38,6 +38,8 @@
|
|||
#include <linux/mailbox_controller.h>
|
||||
#include <linux/mailbox_client.h>
|
||||
|
||||
#include "mailbox.h"
|
||||
|
||||
#define MAILBOX_REVISION 0x000
|
||||
#define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
|
||||
#define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
|
||||
|
|
@ -106,6 +108,7 @@ struct omap_mbox_fifo_info {
|
|||
int rx_irq;
|
||||
|
||||
const char *name;
|
||||
bool send_no_irq;
|
||||
};
|
||||
|
||||
struct omap_mbox {
|
||||
|
|
@ -119,6 +122,7 @@ struct omap_mbox {
|
|||
u32 ctx[OMAP4_MBOX_NR_REGS];
|
||||
u32 intr_type;
|
||||
struct mbox_chan *chan;
|
||||
bool send_no_irq;
|
||||
};
|
||||
|
||||
/* global variables for the mailbox devices */
|
||||
|
|
@ -418,6 +422,9 @@ static int omap_mbox_startup(struct omap_mbox *mbox)
|
|||
goto fail_request_irq;
|
||||
}
|
||||
|
||||
if (mbox->send_no_irq)
|
||||
mbox->chan->txdone_method = TXDONE_BY_ACK;
|
||||
|
||||
_omap_mbox_enable_irq(mbox, IRQ_RX);
|
||||
|
||||
return 0;
|
||||
|
|
@ -586,13 +593,27 @@ static void omap_mbox_chan_shutdown(struct mbox_chan *chan)
|
|||
mutex_unlock(&mdev->cfg_lock);
|
||||
}
|
||||
|
||||
static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
|
||||
static int omap_mbox_chan_send_noirq(struct omap_mbox *mbox, void *data)
|
||||
{
|
||||
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
|
||||
int ret = -EBUSY;
|
||||
|
||||
if (!mbox)
|
||||
return -EINVAL;
|
||||
if (!mbox_fifo_full(mbox)) {
|
||||
_omap_mbox_enable_irq(mbox, IRQ_RX);
|
||||
mbox_fifo_write(mbox, (mbox_msg_t)data);
|
||||
ret = 0;
|
||||
_omap_mbox_disable_irq(mbox, IRQ_RX);
|
||||
|
||||
/* we must read and ack the interrupt directly from here */
|
||||
mbox_fifo_read(mbox);
|
||||
ack_mbox_irq(mbox, IRQ_RX);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int omap_mbox_chan_send(struct omap_mbox *mbox, void *data)
|
||||
{
|
||||
int ret = -EBUSY;
|
||||
|
||||
if (!mbox_fifo_full(mbox)) {
|
||||
mbox_fifo_write(mbox, (mbox_msg_t)data);
|
||||
|
|
@ -604,6 +625,22 @@ static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
|
||||
{
|
||||
struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
|
||||
int ret;
|
||||
|
||||
if (!mbox)
|
||||
return -EINVAL;
|
||||
|
||||
if (mbox->send_no_irq)
|
||||
ret = omap_mbox_chan_send_noirq(mbox, data);
|
||||
else
|
||||
ret = omap_mbox_chan_send(mbox, data);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct mbox_chan_ops omap_mbox_chan_ops = {
|
||||
.startup = omap_mbox_chan_startup,
|
||||
.send_data = omap_mbox_chan_send_data,
|
||||
|
|
@ -732,6 +769,9 @@ static int omap_mbox_probe(struct platform_device *pdev)
|
|||
finfo->rx_usr = tmp[2];
|
||||
|
||||
finfo->name = child->name;
|
||||
|
||||
if (of_find_property(child, "ti,mbox-send-noirq", NULL))
|
||||
finfo->send_no_irq = true;
|
||||
} else {
|
||||
finfo->tx_id = info->tx_id;
|
||||
finfo->rx_id = info->rx_id;
|
||||
|
|
@ -791,6 +831,7 @@ static int omap_mbox_probe(struct platform_device *pdev)
|
|||
fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->rx_usr);
|
||||
fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->rx_usr);
|
||||
|
||||
mbox->send_no_irq = finfo->send_no_irq;
|
||||
mbox->intr_type = intr_type;
|
||||
|
||||
mbox->parent = mdev;
|
||||
|
|
|
|||
|
|
@ -122,7 +122,7 @@ struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl,
|
|||
*/
|
||||
chan = get_pcc_channel(subspace_id);
|
||||
|
||||
if (!chan || chan->cl) {
|
||||
if (IS_ERR(chan) || chan->cl) {
|
||||
dev_err(dev, "Channel not found for idx: %d\n", subspace_id);
|
||||
return ERR_PTR(-EBUSY);
|
||||
}
|
||||
|
|
|
|||
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