![Kees Cook](/assets/img/avatar_default.png)
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc(). This patch replaces cases of: devm_kzalloc(handle, a * b, gfp) with: devm_kcalloc(handle, a * b, gfp) as well as handling cases of: devm_kzalloc(handle, a * b * c, gfp) with: devm_kzalloc(handle, array3_size(a, b, c), gfp) as it's slightly less ugly than: devm_kcalloc(handle, array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: devm_kzalloc(handle, 4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. Some manual whitespace fixes were needed in this patch, as Coccinelle really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...". The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ expression HANDLE; type TYPE; expression THING, E; @@ ( devm_kzalloc(HANDLE, - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | devm_kzalloc(HANDLE, - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression HANDLE; expression COUNT; typedef u8; typedef __u8; @@ ( devm_kzalloc(HANDLE, - sizeof(u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * (COUNT) + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(__u8) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(char) * COUNT + COUNT , ...) | devm_kzalloc(HANDLE, - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ expression HANDLE; type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ expression HANDLE; identifier SIZE, COUNT; @@ - devm_kzalloc + devm_kcalloc (HANDLE, - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression HANDLE; expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression HANDLE; expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | devm_kzalloc(HANDLE, - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ expression HANDLE; identifier STRIDE, SIZE, COUNT; @@ ( devm_kzalloc(HANDLE, - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | devm_kzalloc(HANDLE, - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression HANDLE; expression E1, E2, E3; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | devm_kzalloc(HANDLE, - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression HANDLE; expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( devm_kzalloc(HANDLE, sizeof(THING) * C2, ...) | devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...) | devm_kzalloc(HANDLE, C1 * C2 * C3, ...) | devm_kzalloc(HANDLE, C1 * C2, ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * E2 + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - (E1) * (E2) + E1, E2 , ...) | - devm_kzalloc + devm_kcalloc (HANDLE, - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
515 lines
13 KiB
C
515 lines
13 KiB
C
/*
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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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*
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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
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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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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*/
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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
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*
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* @mdev: Pointer to parent Mailbox device
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* @instance: Instance number channel resides in
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* @channel: Channel number pertaining to this container
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*/
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struct sti_channel {
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struct sti_mbox_device *mdev;
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unsigned int instance;
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unsigned int channel;
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};
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static inline bool sti_mbox_channel_is_enabled(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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return mdev->enabled[instance] & BIT(channel);
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}
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static inline
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struct mbox_chan *sti_mbox_to_channel(struct mbox_controller *mbox,
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unsigned int instance,
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unsigned int channel)
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{
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struct sti_channel *chan_info;
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int i;
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for (i = 0; i < mbox->num_chans; i++) {
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chan_info = mbox->chans[i].con_priv;
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if (chan_info &&
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chan_info->instance == instance &&
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chan_info->channel == channel)
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return &mbox->chans[i];
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}
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dev_err(mbox->dev,
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"Channel not registered: instance: %d channel: %d\n",
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instance, channel);
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return NULL;
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}
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static void sti_mbox_enable_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_SET_OFFSET);
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spin_unlock_irqrestore(&mdev->lock, flags);
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}
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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);
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}
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static void sti_mbox_clear_irq(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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void __iomem *base = MBOX_BASE(mdev, instance);
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writel_relaxed(BIT(channel), base + STI_IRQ_CLR_OFFSET);
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}
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static struct mbox_chan *sti_mbox_irq_to_channel(struct sti_mbox_device *mdev,
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unsigned int instance)
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{
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struct mbox_controller *mbox = mdev->mbox;
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struct mbox_chan *chan = NULL;
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unsigned int channel;
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unsigned long bits;
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void __iomem *base = MBOX_BASE(mdev, instance);
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bits = readl_relaxed(base + STI_IRQ_VAL_OFFSET);
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if (!bits)
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/* No IRQs fired in specified instance */
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return NULL;
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/* An IRQ has fired, find the associated channel */
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for (channel = 0; bits; channel++) {
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if (!test_and_clear_bit(channel, &bits))
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continue;
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chan = sti_mbox_to_channel(mbox, instance, channel);
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if (chan) {
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dev_dbg(mbox->dev,
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"IRQ fired on instance: %d channel: %d\n",
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instance, channel);
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break;
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}
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}
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return chan;
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}
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static irqreturn_t sti_mbox_thread_handler(int irq, void *data)
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{
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struct sti_mbox_device *mdev = data;
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struct sti_mbox_pdata *pdata = dev_get_platdata(mdev->dev);
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struct mbox_chan *chan;
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unsigned int instance;
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for (instance = 0; instance < pdata->num_inst; instance++) {
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keep_looking:
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chan = sti_mbox_irq_to_channel(mdev, instance);
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if (!chan)
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continue;
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mbox_chan_received_data(chan, NULL);
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sti_mbox_clear_irq(chan);
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sti_mbox_enable_channel(chan);
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goto keep_looking;
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}
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return IRQ_HANDLED;
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}
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static irqreturn_t sti_mbox_irq_handler(int irq, void *data)
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{
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struct sti_mbox_device *mdev = data;
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struct sti_mbox_pdata *pdata = dev_get_platdata(mdev->dev);
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struct sti_channel *chan_info;
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struct mbox_chan *chan;
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unsigned int instance;
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int ret = IRQ_NONE;
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for (instance = 0; instance < pdata->num_inst; instance++) {
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chan = sti_mbox_irq_to_channel(mdev, instance);
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if (!chan)
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continue;
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chan_info = chan->con_priv;
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if (!sti_mbox_channel_is_enabled(chan)) {
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dev_warn(mdev->dev,
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"Unexpected IRQ: %s\n"
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" instance: %d: channel: %d [enabled: %x]\n",
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mdev->name, chan_info->instance,
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chan_info->channel, mdev->enabled[instance]);
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/* Only handle IRQ if no other valid IRQs were found */
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if (ret == IRQ_NONE)
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ret = IRQ_HANDLED;
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continue;
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}
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sti_mbox_disable_channel(chan);
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ret = IRQ_WAKE_THREAD;
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}
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if (ret == IRQ_NONE)
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dev_err(mdev->dev, "Spurious IRQ - was a channel requested?\n");
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return ret;
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}
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static bool sti_mbox_tx_is_ready(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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void __iomem *base = MBOX_BASE(mdev, instance);
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if (!(readl_relaxed(base + STI_ENA_VAL_OFFSET) & BIT(channel))) {
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dev_dbg(mdev->dev, "Mbox: %s: inst: %d, chan: %d disabled\n",
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mdev->name, instance, channel);
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return false;
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}
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if (readl_relaxed(base + STI_IRQ_VAL_OFFSET) & BIT(channel)) {
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dev_dbg(mdev->dev, "Mbox: %s: inst: %d, chan: %d not ready\n",
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mdev->name, instance, channel);
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return false;
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}
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return true;
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}
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static int sti_mbox_send_data(struct mbox_chan *chan, void *data)
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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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void __iomem *base = MBOX_BASE(mdev, instance);
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/* Send event to co-processor */
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writel_relaxed(BIT(channel), base + STI_IRQ_SET_OFFSET);
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dev_dbg(mdev->dev,
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"Sent via Mailbox %s: instance: %d channel: %d\n",
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mdev->name, instance, channel);
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return 0;
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}
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static int sti_mbox_startup_chan(struct mbox_chan *chan)
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{
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sti_mbox_clear_irq(chan);
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sti_mbox_enable_channel(chan);
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return 0;
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}
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static void sti_mbox_shutdown_chan(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 mbox_controller *mbox = chan_info->mdev->mbox;
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int i;
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for (i = 0; i < mbox->num_chans; i++)
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if (chan == &mbox->chans[i])
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break;
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if (mbox->num_chans == i) {
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dev_warn(mbox->dev, "Request to free non-existent channel\n");
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return;
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}
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/* Reset channel */
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sti_mbox_disable_channel(chan);
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sti_mbox_clear_irq(chan);
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chan->con_priv = NULL;
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}
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static struct mbox_chan *sti_mbox_xlate(struct mbox_controller *mbox,
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const struct of_phandle_args *spec)
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{
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struct sti_mbox_device *mdev = dev_get_drvdata(mbox->dev);
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struct sti_mbox_pdata *pdata = dev_get_platdata(mdev->dev);
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struct sti_channel *chan_info;
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struct mbox_chan *chan = NULL;
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unsigned int instance = spec->args[0];
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unsigned int channel = spec->args[1];
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int i;
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/* Bounds checking */
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if (instance >= pdata->num_inst || channel >= pdata->num_chan) {
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dev_err(mbox->dev,
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"Invalid channel requested instance: %d channel: %d\n",
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instance, channel);
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return ERR_PTR(-EINVAL);
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}
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for (i = 0; i < mbox->num_chans; i++) {
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chan_info = mbox->chans[i].con_priv;
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/* 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 const 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
|
|
},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sti_mailbox_match);
|
|
|
|
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 (IS_ERR(mdev->base))
|
|
return PTR_ERR(mdev->base);
|
|
|
|
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_kcalloc(&pdev->dev,
|
|
STI_MBOX_CHAN_MAX, sizeof(*chans), 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");
|