linux/arch/arm/plat-stmp3xxx/dma.c

465 lines
11 KiB
C
Raw Normal View History

/*
* DMA helper routines for Freescale STMP37XX/STMP378X
*
* Author: dmitry pervushin <dpervushin@embeddedalley.com>
*
* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/dmapool.h>
#include <linux/sysdev.h>
#include <linux/cpufreq.h>
#include <asm/page.h>
#include <mach/platform.h>
#include <mach/dma.h>
#include <mach/regs-apbx.h>
#include <mach/regs-apbh.h>
static const size_t pool_item_size = sizeof(struct stmp3xxx_dma_command);
static const size_t pool_alignment = 8;
static struct stmp3xxx_dma_user {
void *pool;
int inuse;
const char *name;
} channels[MAX_DMA_CHANNELS];
#define IS_VALID_CHANNEL(ch) ((ch) >= 0 && (ch) < MAX_DMA_CHANNELS)
#define IS_USED(ch) (channels[ch].inuse)
int stmp3xxx_dma_request(int ch, struct device *dev, const char *name)
{
struct stmp3xxx_dma_user *user;
int err = 0;
user = channels + ch;
if (!IS_VALID_CHANNEL(ch)) {
err = -ENODEV;
goto out;
}
if (IS_USED(ch)) {
err = -EBUSY;
goto out;
}
/* Create a pool to allocate dma commands from */
user->pool = dma_pool_create(name, dev, pool_item_size,
pool_alignment, PAGE_SIZE);
if (user->pool == NULL) {
err = -ENOMEM;
goto out;
}
user->name = name;
user->inuse++;
out:
return err;
}
EXPORT_SYMBOL(stmp3xxx_dma_request);
int stmp3xxx_dma_release(int ch)
{
struct stmp3xxx_dma_user *user = channels + ch;
int err = 0;
if (!IS_VALID_CHANNEL(ch)) {
err = -ENODEV;
goto out;
}
if (!IS_USED(ch)) {
err = -EBUSY;
goto out;
}
BUG_ON(user->pool == NULL);
dma_pool_destroy(user->pool);
user->inuse--;
out:
return err;
}
EXPORT_SYMBOL(stmp3xxx_dma_release);
int stmp3xxx_dma_read_semaphore(int channel)
{
int sem = -1;
switch (STMP3XXX_DMA_BUS(channel)) {
case STMP3XXX_BUS_APBH:
sem = __raw_readl(REGS_APBH_BASE + HW_APBH_CHn_SEMA +
STMP3XXX_DMA_CHANNEL(channel) * 0x70);
sem &= BM_APBH_CHn_SEMA_PHORE;
sem >>= BP_APBH_CHn_SEMA_PHORE;
break;
case STMP3XXX_BUS_APBX:
sem = __raw_readl(REGS_APBX_BASE + HW_APBX_CHn_SEMA +
STMP3XXX_DMA_CHANNEL(channel) * 0x70);
sem &= BM_APBX_CHn_SEMA_PHORE;
sem >>= BP_APBX_CHn_SEMA_PHORE;
break;
default:
BUG();
}
return sem;
}
EXPORT_SYMBOL(stmp3xxx_dma_read_semaphore);
int stmp3xxx_dma_allocate_command(int channel,
struct stmp3xxx_dma_descriptor *descriptor)
{
struct stmp3xxx_dma_user *user = channels + channel;
int err = 0;
if (!IS_VALID_CHANNEL(channel)) {
err = -ENODEV;
goto out;
}
if (!IS_USED(channel)) {
err = -EBUSY;
goto out;
}
if (descriptor == NULL) {
err = -EINVAL;
goto out;
}
/* Allocate memory for a command from the buffer */
descriptor->command =
dma_pool_alloc(user->pool, GFP_KERNEL, &descriptor->handle);
/* Check it worked */
if (!descriptor->command) {
err = -ENOMEM;
goto out;
}
memset(descriptor->command, 0, pool_item_size);
out:
WARN_ON(err);
return err;
}
EXPORT_SYMBOL(stmp3xxx_dma_allocate_command);
int stmp3xxx_dma_free_command(int channel,
struct stmp3xxx_dma_descriptor *descriptor)
{
int err = 0;
if (!IS_VALID_CHANNEL(channel)) {
err = -ENODEV;
goto out;
}
if (!IS_USED(channel)) {
err = -EBUSY;
goto out;
}
/* Return the command memory to the pool */
dma_pool_free(channels[channel].pool, descriptor->command,
descriptor->handle);
/* Initialise descriptor so we're not tempted to use it */
descriptor->command = NULL;
descriptor->handle = 0;
descriptor->virtual_buf_ptr = NULL;
descriptor->next_descr = NULL;
WARN_ON(err);
out:
return err;
}
EXPORT_SYMBOL(stmp3xxx_dma_free_command);
void stmp3xxx_dma_go(int channel,
struct stmp3xxx_dma_descriptor *head, u32 semaphore)
{
int ch = STMP3XXX_DMA_CHANNEL(channel);
void __iomem *c, *s;
switch (STMP3XXX_DMA_BUS(channel)) {
case STMP3XXX_BUS_APBH:
c = REGS_APBH_BASE + HW_APBH_CHn_NXTCMDAR + 0x70 * ch;
s = REGS_APBH_BASE + HW_APBH_CHn_SEMA + 0x70 * ch;
break;
case STMP3XXX_BUS_APBX:
c = REGS_APBX_BASE + HW_APBX_CHn_NXTCMDAR + 0x70 * ch;
s = REGS_APBX_BASE + HW_APBX_CHn_SEMA + 0x70 * ch;
break;
default:
return;
}
/* Set next command */
__raw_writel(head->handle, c);
/* Set counting semaphore (kicks off transfer). Assumes
peripheral has been set up correctly */
__raw_writel(semaphore, s);
}
EXPORT_SYMBOL(stmp3xxx_dma_go);
int stmp3xxx_dma_running(int channel)
{
switch (STMP3XXX_DMA_BUS(channel)) {
case STMP3XXX_BUS_APBH:
return (__raw_readl(REGS_APBH_BASE + HW_APBH_CHn_SEMA +
0x70 * STMP3XXX_DMA_CHANNEL(channel))) &
BM_APBH_CHn_SEMA_PHORE;
case STMP3XXX_BUS_APBX:
return (__raw_readl(REGS_APBX_BASE + HW_APBX_CHn_SEMA +
0x70 * STMP3XXX_DMA_CHANNEL(channel))) &
BM_APBX_CHn_SEMA_PHORE;
default:
BUG();
return 0;
}
}
EXPORT_SYMBOL(stmp3xxx_dma_running);
/*
* Circular dma chain management
*/
void stmp3xxx_dma_free_chain(struct stmp37xx_circ_dma_chain *chain)
{
int i;
for (i = 0; i < chain->total_count; i++)
stmp3xxx_dma_free_command(
STMP3XXX_DMA(chain->channel, chain->bus),
&chain->chain[i]);
}
EXPORT_SYMBOL(stmp3xxx_dma_free_chain);
int stmp3xxx_dma_make_chain(int ch, struct stmp37xx_circ_dma_chain *chain,
struct stmp3xxx_dma_descriptor descriptors[],
unsigned items)
{
int i;
int err = 0;
if (items == 0)
return err;
for (i = 0; i < items; i++) {
err = stmp3xxx_dma_allocate_command(ch, &descriptors[i]);
if (err) {
WARN_ON(err);
/*
* Couldn't allocate the whole chain.
* deallocate what has been allocated
*/
if (i) {
do {
stmp3xxx_dma_free_command(ch,
&descriptors
[i]);
} while (i-- > 0);
}
return err;
}
/* link them! */
if (i > 0) {
descriptors[i - 1].next_descr = &descriptors[i];
descriptors[i - 1].command->next =
descriptors[i].handle;
}
}
/* make list circular */
descriptors[items - 1].next_descr = &descriptors[0];
descriptors[items - 1].command->next = descriptors[0].handle;
chain->total_count = items;
chain->chain = descriptors;
chain->free_index = 0;
chain->active_index = 0;
chain->cooked_index = 0;
chain->free_count = items;
chain->active_count = 0;
chain->cooked_count = 0;
chain->bus = STMP3XXX_DMA_BUS(ch);
chain->channel = STMP3XXX_DMA_CHANNEL(ch);
return err;
}
EXPORT_SYMBOL(stmp3xxx_dma_make_chain);
void stmp37xx_circ_clear_chain(struct stmp37xx_circ_dma_chain *chain)
{
BUG_ON(stmp3xxx_dma_running(STMP3XXX_DMA(chain->channel, chain->bus)));
chain->free_index = 0;
chain->active_index = 0;
chain->cooked_index = 0;
chain->free_count = chain->total_count;
chain->active_count = 0;
chain->cooked_count = 0;
}
EXPORT_SYMBOL(stmp37xx_circ_clear_chain);
void stmp37xx_circ_advance_free(struct stmp37xx_circ_dma_chain *chain,
unsigned count)
{
BUG_ON(chain->cooked_count < count);
chain->cooked_count -= count;
chain->cooked_index += count;
chain->cooked_index %= chain->total_count;
chain->free_count += count;
}
EXPORT_SYMBOL(stmp37xx_circ_advance_free);
void stmp37xx_circ_advance_active(struct stmp37xx_circ_dma_chain *chain,
unsigned count)
{
void __iomem *c;
u32 mask_clr, mask;
BUG_ON(chain->free_count < count);
chain->free_count -= count;
chain->free_index += count;
chain->free_index %= chain->total_count;
chain->active_count += count;
switch (chain->bus) {
case STMP3XXX_BUS_APBH:
c = REGS_APBH_BASE + HW_APBH_CHn_SEMA + 0x70 * chain->channel;
mask_clr = BM_APBH_CHn_SEMA_INCREMENT_SEMA;
mask = BF(count, APBH_CHn_SEMA_INCREMENT_SEMA);
break;
case STMP3XXX_BUS_APBX:
c = REGS_APBX_BASE + HW_APBX_CHn_SEMA + 0x70 * chain->channel;
mask_clr = BM_APBX_CHn_SEMA_INCREMENT_SEMA;
mask = BF(count, APBX_CHn_SEMA_INCREMENT_SEMA);
break;
default:
BUG();
return;
}
/* Set counting semaphore (kicks off transfer). Assumes
peripheral has been set up correctly */
stmp3xxx_clearl(mask_clr, c);
stmp3xxx_setl(mask, c);
}
EXPORT_SYMBOL(stmp37xx_circ_advance_active);
unsigned stmp37xx_circ_advance_cooked(struct stmp37xx_circ_dma_chain *chain)
{
unsigned cooked;
cooked = chain->active_count -
stmp3xxx_dma_read_semaphore(STMP3XXX_DMA(chain->channel, chain->bus));
chain->active_count -= cooked;
chain->active_index += cooked;
chain->active_index %= chain->total_count;
chain->cooked_count += cooked;
return cooked;
}
EXPORT_SYMBOL(stmp37xx_circ_advance_cooked);
void stmp3xxx_dma_set_alt_target(int channel, int function)
{
#if defined(CONFIG_ARCH_STMP37XX)
unsigned bits = 4;
#elif defined(CONFIG_ARCH_STMP378X)
unsigned bits = 2;
#else
#error wrong arch
#endif
int shift = STMP3XXX_DMA_CHANNEL(channel) * bits;
unsigned mask = (1<<bits) - 1;
void __iomem *c;
BUG_ON(function < 0 || function >= (1<<bits));
pr_debug("%s: channel = %d, using mask %x, "
"shift = %d\n", __func__, channel, mask, shift);
switch (STMP3XXX_DMA_BUS(channel)) {
case STMP3XXX_BUS_APBH:
c = REGS_APBH_BASE + HW_APBH_DEVSEL;
break;
case STMP3XXX_BUS_APBX:
c = REGS_APBX_BASE + HW_APBX_DEVSEL;
break;
default:
BUG();
}
stmp3xxx_clearl(mask << shift, c);
stmp3xxx_setl(mask << shift, c);
}
EXPORT_SYMBOL(stmp3xxx_dma_set_alt_target);
void stmp3xxx_dma_suspend(void)
{
stmp3xxx_setl(BM_APBH_CTRL0_CLKGATE, REGS_APBH_BASE + HW_APBH_CTRL0);
stmp3xxx_setl(BM_APBX_CTRL0_CLKGATE, REGS_APBX_BASE + HW_APBX_CTRL0);
}
void stmp3xxx_dma_resume(void)
{
stmp3xxx_clearl(BM_APBH_CTRL0_CLKGATE | BM_APBH_CTRL0_SFTRST,
REGS_APBH_BASE + HW_APBH_CTRL0);
stmp3xxx_clearl(BM_APBX_CTRL0_CLKGATE | BM_APBX_CTRL0_SFTRST,
REGS_APBX_BASE + HW_APBX_CTRL0);
}
#ifdef CONFIG_CPU_FREQ
struct dma_notifier_block {
struct notifier_block nb;
void *data;
};
static int dma_cpufreq_notifier(struct notifier_block *self,
unsigned long phase, void *p)
{
switch (phase) {
case CPUFREQ_POSTCHANGE:
stmp3xxx_dma_resume();
break;
case CPUFREQ_PRECHANGE:
stmp3xxx_dma_suspend();
break;
default:
break;
}
return NOTIFY_DONE;
}
static struct dma_notifier_block dma_cpufreq_nb = {
.nb = {
.notifier_call = dma_cpufreq_notifier,
},
};
#endif /* CONFIG_CPU_FREQ */
void __init stmp3xxx_dma_init(void)
{
stmp3xxx_clearl(BM_APBH_CTRL0_CLKGATE | BM_APBH_CTRL0_SFTRST,
REGS_APBH_BASE + HW_APBH_CTRL0);
stmp3xxx_clearl(BM_APBX_CTRL0_CLKGATE | BM_APBX_CTRL0_SFTRST,
REGS_APBX_BASE + HW_APBX_CTRL0);
#ifdef CONFIG_CPU_FREQ
cpufreq_register_notifier(&dma_cpufreq_nb.nb,
CPUFREQ_TRANSITION_NOTIFIER);
#endif /* CONFIG_CPU_FREQ */
}