linux/sound/soc/intel/sst-dsp.c
Markus Elfring 544c55c810 ASoC: Intel: Delete an unnecessary check before the function call "sst_dma_free"
The sst_dma_free() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-01-05 19:02:35 +00:00

421 lines
9.6 KiB
C

/*
* Intel Smart Sound Technology (SST) DSP Core Driver
*
* Copyright (C) 2013, Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include "sst-dsp.h"
#include "sst-dsp-priv.h"
#define CREATE_TRACE_POINTS
#include <trace/events/intel-sst.h>
/* Internal generic low-level SST IO functions - can be overidden */
void sst_shim32_write(void __iomem *addr, u32 offset, u32 value)
{
writel(value, addr + offset);
}
EXPORT_SYMBOL_GPL(sst_shim32_write);
u32 sst_shim32_read(void __iomem *addr, u32 offset)
{
return readl(addr + offset);
}
EXPORT_SYMBOL_GPL(sst_shim32_read);
void sst_shim32_write64(void __iomem *addr, u32 offset, u64 value)
{
memcpy_toio(addr + offset, &value, sizeof(value));
}
EXPORT_SYMBOL_GPL(sst_shim32_write64);
u64 sst_shim32_read64(void __iomem *addr, u32 offset)
{
u64 val;
memcpy_fromio(&val, addr + offset, sizeof(val));
return val;
}
EXPORT_SYMBOL_GPL(sst_shim32_read64);
static inline void _sst_memcpy_toio_32(volatile u32 __iomem *dest,
u32 *src, size_t bytes)
{
int i, words = bytes >> 2;
for (i = 0; i < words; i++)
writel(src[i], dest + i);
}
static inline void _sst_memcpy_fromio_32(u32 *dest,
const volatile __iomem u32 *src, size_t bytes)
{
int i, words = bytes >> 2;
for (i = 0; i < words; i++)
dest[i] = readl(src + i);
}
void sst_memcpy_toio_32(struct sst_dsp *sst,
void __iomem *dest, void *src, size_t bytes)
{
_sst_memcpy_toio_32(dest, src, bytes);
}
EXPORT_SYMBOL_GPL(sst_memcpy_toio_32);
void sst_memcpy_fromio_32(struct sst_dsp *sst, void *dest,
void __iomem *src, size_t bytes)
{
_sst_memcpy_fromio_32(dest, src, bytes);
}
EXPORT_SYMBOL_GPL(sst_memcpy_fromio_32);
/* Public API */
void sst_dsp_shim_write(struct sst_dsp *sst, u32 offset, u32 value)
{
unsigned long flags;
spin_lock_irqsave(&sst->spinlock, flags);
sst->ops->write(sst->addr.shim, offset, value);
spin_unlock_irqrestore(&sst->spinlock, flags);
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_write);
u32 sst_dsp_shim_read(struct sst_dsp *sst, u32 offset)
{
unsigned long flags;
u32 val;
spin_lock_irqsave(&sst->spinlock, flags);
val = sst->ops->read(sst->addr.shim, offset);
spin_unlock_irqrestore(&sst->spinlock, flags);
return val;
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_read);
void sst_dsp_shim_write64(struct sst_dsp *sst, u32 offset, u64 value)
{
unsigned long flags;
spin_lock_irqsave(&sst->spinlock, flags);
sst->ops->write64(sst->addr.shim, offset, value);
spin_unlock_irqrestore(&sst->spinlock, flags);
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_write64);
u64 sst_dsp_shim_read64(struct sst_dsp *sst, u32 offset)
{
unsigned long flags;
u64 val;
spin_lock_irqsave(&sst->spinlock, flags);
val = sst->ops->read64(sst->addr.shim, offset);
spin_unlock_irqrestore(&sst->spinlock, flags);
return val;
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_read64);
void sst_dsp_shim_write_unlocked(struct sst_dsp *sst, u32 offset, u32 value)
{
sst->ops->write(sst->addr.shim, offset, value);
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_write_unlocked);
u32 sst_dsp_shim_read_unlocked(struct sst_dsp *sst, u32 offset)
{
return sst->ops->read(sst->addr.shim, offset);
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_read_unlocked);
void sst_dsp_shim_write64_unlocked(struct sst_dsp *sst, u32 offset, u64 value)
{
sst->ops->write64(sst->addr.shim, offset, value);
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_write64_unlocked);
u64 sst_dsp_shim_read64_unlocked(struct sst_dsp *sst, u32 offset)
{
return sst->ops->read64(sst->addr.shim, offset);
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_read64_unlocked);
int sst_dsp_shim_update_bits_unlocked(struct sst_dsp *sst, u32 offset,
u32 mask, u32 value)
{
bool change;
unsigned int old, new;
u32 ret;
ret = sst_dsp_shim_read_unlocked(sst, offset);
old = ret;
new = (old & (~mask)) | (value & mask);
change = (old != new);
if (change)
sst_dsp_shim_write_unlocked(sst, offset, new);
return change;
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_update_bits_unlocked);
int sst_dsp_shim_update_bits64_unlocked(struct sst_dsp *sst, u32 offset,
u64 mask, u64 value)
{
bool change;
u64 old, new;
old = sst_dsp_shim_read64_unlocked(sst, offset);
new = (old & (~mask)) | (value & mask);
change = (old != new);
if (change)
sst_dsp_shim_write64_unlocked(sst, offset, new);
return change;
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_update_bits64_unlocked);
int sst_dsp_shim_update_bits(struct sst_dsp *sst, u32 offset,
u32 mask, u32 value)
{
unsigned long flags;
bool change;
spin_lock_irqsave(&sst->spinlock, flags);
change = sst_dsp_shim_update_bits_unlocked(sst, offset, mask, value);
spin_unlock_irqrestore(&sst->spinlock, flags);
return change;
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_update_bits);
int sst_dsp_shim_update_bits64(struct sst_dsp *sst, u32 offset,
u64 mask, u64 value)
{
unsigned long flags;
bool change;
spin_lock_irqsave(&sst->spinlock, flags);
change = sst_dsp_shim_update_bits64_unlocked(sst, offset, mask, value);
spin_unlock_irqrestore(&sst->spinlock, flags);
return change;
}
EXPORT_SYMBOL_GPL(sst_dsp_shim_update_bits64);
void sst_dsp_dump(struct sst_dsp *sst)
{
if (sst->ops->dump)
sst->ops->dump(sst);
}
EXPORT_SYMBOL_GPL(sst_dsp_dump);
void sst_dsp_reset(struct sst_dsp *sst)
{
if (sst->ops->reset)
sst->ops->reset(sst);
}
EXPORT_SYMBOL_GPL(sst_dsp_reset);
int sst_dsp_boot(struct sst_dsp *sst)
{
if (sst->ops->boot)
sst->ops->boot(sst);
return 0;
}
EXPORT_SYMBOL_GPL(sst_dsp_boot);
int sst_dsp_wake(struct sst_dsp *sst)
{
if (sst->ops->wake)
return sst->ops->wake(sst);
return 0;
}
EXPORT_SYMBOL_GPL(sst_dsp_wake);
void sst_dsp_sleep(struct sst_dsp *sst)
{
if (sst->ops->sleep)
sst->ops->sleep(sst);
}
EXPORT_SYMBOL_GPL(sst_dsp_sleep);
void sst_dsp_stall(struct sst_dsp *sst)
{
if (sst->ops->stall)
sst->ops->stall(sst);
}
EXPORT_SYMBOL_GPL(sst_dsp_stall);
void sst_dsp_ipc_msg_tx(struct sst_dsp *dsp, u32 msg)
{
sst_dsp_shim_write_unlocked(dsp, SST_IPCX, msg | SST_IPCX_BUSY);
trace_sst_ipc_msg_tx(msg);
}
EXPORT_SYMBOL_GPL(sst_dsp_ipc_msg_tx);
u32 sst_dsp_ipc_msg_rx(struct sst_dsp *dsp)
{
u32 msg;
msg = sst_dsp_shim_read_unlocked(dsp, SST_IPCX);
trace_sst_ipc_msg_rx(msg);
return msg;
}
EXPORT_SYMBOL_GPL(sst_dsp_ipc_msg_rx);
int sst_dsp_mailbox_init(struct sst_dsp *sst, u32 inbox_offset, size_t inbox_size,
u32 outbox_offset, size_t outbox_size)
{
sst->mailbox.in_base = sst->addr.lpe + inbox_offset;
sst->mailbox.out_base = sst->addr.lpe + outbox_offset;
sst->mailbox.in_size = inbox_size;
sst->mailbox.out_size = outbox_size;
return 0;
}
EXPORT_SYMBOL_GPL(sst_dsp_mailbox_init);
void sst_dsp_outbox_write(struct sst_dsp *sst, void *message, size_t bytes)
{
u32 i;
trace_sst_ipc_outbox_write(bytes);
memcpy_toio(sst->mailbox.out_base, message, bytes);
for (i = 0; i < bytes; i += 4)
trace_sst_ipc_outbox_wdata(i, *(u32 *)(message + i));
}
EXPORT_SYMBOL_GPL(sst_dsp_outbox_write);
void sst_dsp_outbox_read(struct sst_dsp *sst, void *message, size_t bytes)
{
u32 i;
trace_sst_ipc_outbox_read(bytes);
memcpy_fromio(message, sst->mailbox.out_base, bytes);
for (i = 0; i < bytes; i += 4)
trace_sst_ipc_outbox_rdata(i, *(u32 *)(message + i));
}
EXPORT_SYMBOL_GPL(sst_dsp_outbox_read);
void sst_dsp_inbox_write(struct sst_dsp *sst, void *message, size_t bytes)
{
u32 i;
trace_sst_ipc_inbox_write(bytes);
memcpy_toio(sst->mailbox.in_base, message, bytes);
for (i = 0; i < bytes; i += 4)
trace_sst_ipc_inbox_wdata(i, *(u32 *)(message + i));
}
EXPORT_SYMBOL_GPL(sst_dsp_inbox_write);
void sst_dsp_inbox_read(struct sst_dsp *sst, void *message, size_t bytes)
{
u32 i;
trace_sst_ipc_inbox_read(bytes);
memcpy_fromio(message, sst->mailbox.in_base, bytes);
for (i = 0; i < bytes; i += 4)
trace_sst_ipc_inbox_rdata(i, *(u32 *)(message + i));
}
EXPORT_SYMBOL_GPL(sst_dsp_inbox_read);
struct sst_dsp *sst_dsp_new(struct device *dev,
struct sst_dsp_device *sst_dev, struct sst_pdata *pdata)
{
struct sst_dsp *sst;
int err;
dev_dbg(dev, "initialising audio DSP id 0x%x\n", pdata->id);
sst = devm_kzalloc(dev, sizeof(*sst), GFP_KERNEL);
if (sst == NULL)
return NULL;
spin_lock_init(&sst->spinlock);
mutex_init(&sst->mutex);
sst->dev = dev;
sst->dma_dev = pdata->dma_dev;
sst->thread_context = sst_dev->thread_context;
sst->sst_dev = sst_dev;
sst->id = pdata->id;
sst->irq = pdata->irq;
sst->ops = sst_dev->ops;
sst->pdata = pdata;
INIT_LIST_HEAD(&sst->used_block_list);
INIT_LIST_HEAD(&sst->free_block_list);
INIT_LIST_HEAD(&sst->module_list);
INIT_LIST_HEAD(&sst->fw_list);
INIT_LIST_HEAD(&sst->scratch_block_list);
/* Initialise SST Audio DSP */
if (sst->ops->init) {
err = sst->ops->init(sst, pdata);
if (err < 0)
return NULL;
}
/* Register the ISR */
err = request_threaded_irq(sst->irq, sst->ops->irq_handler,
sst_dev->thread, IRQF_SHARED, "AudioDSP", sst);
if (err)
goto irq_err;
err = sst_dma_new(sst);
if (err)
dev_warn(dev, "sst_dma_new failed %d\n", err);
return sst;
irq_err:
if (sst->ops->free)
sst->ops->free(sst);
return NULL;
}
EXPORT_SYMBOL_GPL(sst_dsp_new);
void sst_dsp_free(struct sst_dsp *sst)
{
free_irq(sst->irq, sst);
if (sst->ops->free)
sst->ops->free(sst);
sst_dma_free(sst->dma);
}
EXPORT_SYMBOL_GPL(sst_dsp_free);
/* Module information */
MODULE_AUTHOR("Liam Girdwood");
MODULE_DESCRIPTION("Intel SST Core");
MODULE_LICENSE("GPL v2");