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linux-sg2042/arch/arm/mach-pnx4008/dma.c

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/*
* linux/arch/arm/mach-pnx4008/dma.c
*
* PNX4008 DMA registration and IRQ dispatching
*
* Author: Vitaly Wool
* Copyright: MontaVista Software Inc. (c) 2005
*
* Based on the code from Nicolas Pitre
*
* 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.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <asm/system.h>
#include <asm/hardware.h>
#include <asm/dma.h>
#include <asm/dma-mapping.h>
#include <asm/io.h>
#include <asm/mach/dma.h>
#include <asm/arch/clock.h>
static struct dma_channel {
char *name;
void (*irq_handler) (int, int, void *, struct pt_regs *);
void *data;
struct pnx4008_dma_ll *ll;
u32 ll_dma;
void *target_addr;
int target_id;
} dma_channels[MAX_DMA_CHANNELS];
static struct ll_pool {
void *vaddr;
void *cur;
dma_addr_t dma_addr;
int count;
} ll_pool;
static spinlock_t ll_lock = SPIN_LOCK_UNLOCKED;
struct pnx4008_dma_ll *pnx4008_alloc_ll_entry(dma_addr_t * ll_dma)
{
struct pnx4008_dma_ll *ll = NULL;
unsigned long flags;
spin_lock_irqsave(&ll_lock, flags);
if (ll_pool.count > 4) { /* can give one more */
ll = *(struct pnx4008_dma_ll **) ll_pool.cur;
*ll_dma = ll_pool.dma_addr + ((void *)ll - ll_pool.vaddr);
*(void **)ll_pool.cur = **(void ***)ll_pool.cur;
memset(ll, 0, sizeof(*ll));
ll_pool.count--;
}
spin_unlock_irqrestore(&ll_lock, flags);
return ll;
}
EXPORT_SYMBOL_GPL(pnx4008_alloc_ll_entry);
void pnx4008_free_ll_entry(struct pnx4008_dma_ll * ll, dma_addr_t ll_dma)
{
unsigned long flags;
if (ll) {
if ((unsigned long)((long)ll - (long)ll_pool.vaddr) > 0x4000) {
printk(KERN_ERR "Trying to free entry not allocated by DMA\n");
BUG();
}
if (ll->flags & DMA_BUFFER_ALLOCATED)
ll->free(ll->alloc_data);
spin_lock_irqsave(&ll_lock, flags);
*(long *)ll = *(long *)ll_pool.cur;
*(long *)ll_pool.cur = (long)ll;
ll_pool.count++;
spin_unlock_irqrestore(&ll_lock, flags);
}
}
EXPORT_SYMBOL_GPL(pnx4008_free_ll_entry);
void pnx4008_free_ll(u32 ll_dma, struct pnx4008_dma_ll * ll)
{
struct pnx4008_dma_ll *ptr;
u32 dma;
while (ll) {
dma = ll->next_dma;
ptr = ll->next;
pnx4008_free_ll_entry(ll, ll_dma);
ll_dma = dma;
ll = ptr;
}
}
EXPORT_SYMBOL_GPL(pnx4008_free_ll);
static int dma_channels_requested = 0;
static inline void dma_increment_usage(void)
{
if (!dma_channels_requested++) {
struct clk *clk = clk_get(0, "dma_ck");
if (!IS_ERR(clk)) {
clk_set_rate(clk, 1);
clk_put(clk);
}
pnx4008_config_dma(-1, -1, 1);
}
}
static inline void dma_decrement_usage(void)
{
if (!--dma_channels_requested) {
struct clk *clk = clk_get(0, "dma_ck");
if (!IS_ERR(clk)) {
clk_set_rate(clk, 0);
clk_put(clk);
}
pnx4008_config_dma(-1, -1, 0);
}
}
static spinlock_t dma_lock = SPIN_LOCK_UNLOCKED;
static inline void pnx4008_dma_lock(void)
{
spin_lock_irq(&dma_lock);
}
static inline void pnx4008_dma_unlock(void)
{
spin_unlock_irq(&dma_lock);
}
#define VALID_CHANNEL(c) (((c) >= 0) && ((c) < MAX_DMA_CHANNELS))
int pnx4008_request_channel(char *name, int ch,
void (*irq_handler) (int, int, void *,
struct pt_regs *), void *data)
{
int i, found = 0;
/* basic sanity checks */
if (!name || (ch != -1 && !VALID_CHANNEL(ch)))
return -EINVAL;
pnx4008_dma_lock();
/* try grabbing a DMA channel with the requested priority */
for (i = MAX_DMA_CHANNELS - 1; i >= 0; i--) {
if (!dma_channels[i].name && (ch == -1 || ch == i)) {
found = 1;
break;
}
}
if (found) {
dma_increment_usage();
dma_channels[i].name = name;
dma_channels[i].irq_handler = irq_handler;
dma_channels[i].data = data;
dma_channels[i].ll = NULL;
dma_channels[i].ll_dma = 0;
} else {
printk(KERN_WARNING "No more available DMA channels for %s\n",
name);
i = -ENODEV;
}
pnx4008_dma_unlock();
return i;
}
EXPORT_SYMBOL_GPL(pnx4008_request_channel);
void pnx4008_free_channel(int ch)
{
if (!dma_channels[ch].name) {
printk(KERN_CRIT
"%s: trying to free channel %d which is already freed\n",
__FUNCTION__, ch);
return;
}
pnx4008_dma_lock();
pnx4008_free_ll(dma_channels[ch].ll_dma, dma_channels[ch].ll);
dma_channels[ch].ll = NULL;
dma_decrement_usage();
dma_channels[ch].name = NULL;
pnx4008_dma_unlock();
}
EXPORT_SYMBOL_GPL(pnx4008_free_channel);
int pnx4008_config_dma(int ahb_m1_be, int ahb_m2_be, int enable)
{
unsigned long dma_cfg = __raw_readl(DMAC_CONFIG);
switch (ahb_m1_be) {
case 0:
dma_cfg &= ~(1 << 1);
break;
case 1:
dma_cfg |= (1 << 1);
break;
default:
break;
}
switch (ahb_m2_be) {
case 0:
dma_cfg &= ~(1 << 2);
break;
case 1:
dma_cfg |= (1 << 2);
break;
default:
break;
}
switch (enable) {
case 0:
dma_cfg &= ~(1 << 0);
break;
case 1:
dma_cfg |= (1 << 0);
break;
default:
break;
}
pnx4008_dma_lock();
__raw_writel(dma_cfg, DMAC_CONFIG);
pnx4008_dma_unlock();
return 0;
}
EXPORT_SYMBOL_GPL(pnx4008_config_dma);
int pnx4008_dma_pack_control(const struct pnx4008_dma_ch_ctrl * ch_ctrl,
unsigned long *ctrl)
{
int i = 0, dbsize, sbsize, err = 0;
if (!ctrl || !ch_ctrl) {
err = -EINVAL;
goto out;
}
*ctrl = 0;
switch (ch_ctrl->tc_mask) {
case 0:
break;
case 1:
*ctrl |= (1 << 31);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_ctrl->cacheable) {
case 0:
break;
case 1:
*ctrl |= (1 << 30);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_ctrl->bufferable) {
case 0:
break;
case 1:
*ctrl |= (1 << 29);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_ctrl->priv_mode) {
case 0:
break;
case 1:
*ctrl |= (1 << 28);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_ctrl->di) {
case 0:
break;
case 1:
*ctrl |= (1 << 27);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_ctrl->si) {
case 0:
break;
case 1:
*ctrl |= (1 << 26);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_ctrl->dest_ahb1) {
case 0:
break;
case 1:
*ctrl |= (1 << 25);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_ctrl->src_ahb1) {
case 0:
break;
case 1:
*ctrl |= (1 << 24);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_ctrl->dwidth) {
case WIDTH_BYTE:
*ctrl &= ~(7 << 21);
break;
case WIDTH_HWORD:
*ctrl &= ~(7 << 21);
*ctrl |= (1 << 21);
break;
case WIDTH_WORD:
*ctrl &= ~(7 << 21);
*ctrl |= (2 << 21);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_ctrl->swidth) {
case WIDTH_BYTE:
*ctrl &= ~(7 << 18);
break;
case WIDTH_HWORD:
*ctrl &= ~(7 << 18);
*ctrl |= (1 << 18);
break;
case WIDTH_WORD:
*ctrl &= ~(7 << 18);
*ctrl |= (2 << 18);
break;
default:
err = -EINVAL;
goto out;
}
dbsize = ch_ctrl->dbsize;
while (!(dbsize & 1)) {
i++;
dbsize >>= 1;
}
if (ch_ctrl->dbsize != 1 || i > 8 || i == 1) {
err = -EINVAL;
goto out;
} else if (i > 1)
i--;
*ctrl &= ~(7 << 15);
*ctrl |= (i << 15);
sbsize = ch_ctrl->sbsize;
while (!(sbsize & 1)) {
i++;
sbsize >>= 1;
}
if (ch_ctrl->sbsize != 1 || i > 8 || i == 1) {
err = -EINVAL;
goto out;
} else if (i > 1)
i--;
*ctrl &= ~(7 << 12);
*ctrl |= (i << 12);
if (ch_ctrl->tr_size > 0x7ff) {
err = -E2BIG;
goto out;
}
*ctrl &= ~0x7ff;
*ctrl |= ch_ctrl->tr_size & 0x7ff;
out:
return err;
}
EXPORT_SYMBOL_GPL(pnx4008_dma_pack_control);
int pnx4008_dma_parse_control(unsigned long ctrl,
struct pnx4008_dma_ch_ctrl * ch_ctrl)
{
int err = 0;
if (!ch_ctrl) {
err = -EINVAL;
goto out;
}
ch_ctrl->tr_size = ctrl & 0x7ff;
ctrl >>= 12;
ch_ctrl->sbsize = 1 << (ctrl & 7);
if (ch_ctrl->sbsize > 1)
ch_ctrl->sbsize <<= 1;
ctrl >>= 3;
ch_ctrl->dbsize = 1 << (ctrl & 7);
if (ch_ctrl->dbsize > 1)
ch_ctrl->dbsize <<= 1;
ctrl >>= 3;
switch (ctrl & 7) {
case 0:
ch_ctrl->swidth = WIDTH_BYTE;
break;
case 1:
ch_ctrl->swidth = WIDTH_HWORD;
break;
case 2:
ch_ctrl->swidth = WIDTH_WORD;
break;
default:
err = -EINVAL;
goto out;
}
ctrl >>= 3;
switch (ctrl & 7) {
case 0:
ch_ctrl->dwidth = WIDTH_BYTE;
break;
case 1:
ch_ctrl->dwidth = WIDTH_HWORD;
break;
case 2:
ch_ctrl->dwidth = WIDTH_WORD;
break;
default:
err = -EINVAL;
goto out;
}
ctrl >>= 3;
ch_ctrl->src_ahb1 = ctrl & 1;
ctrl >>= 1;
ch_ctrl->dest_ahb1 = ctrl & 1;
ctrl >>= 1;
ch_ctrl->si = ctrl & 1;
ctrl >>= 1;
ch_ctrl->di = ctrl & 1;
ctrl >>= 1;
ch_ctrl->priv_mode = ctrl & 1;
ctrl >>= 1;
ch_ctrl->bufferable = ctrl & 1;
ctrl >>= 1;
ch_ctrl->cacheable = ctrl & 1;
ctrl >>= 1;
ch_ctrl->tc_mask = ctrl & 1;
out:
return err;
}
EXPORT_SYMBOL_GPL(pnx4008_dma_parse_control);
int pnx4008_dma_pack_config(const struct pnx4008_dma_ch_config * ch_cfg,
unsigned long *cfg)
{
int err = 0;
if (!cfg || !ch_cfg) {
err = -EINVAL;
goto out;
}
*cfg = 0;
switch (ch_cfg->halt) {
case 0:
break;
case 1:
*cfg |= (1 << 18);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_cfg->active) {
case 0:
break;
case 1:
*cfg |= (1 << 17);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_cfg->lock) {
case 0:
break;
case 1:
*cfg |= (1 << 16);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_cfg->itc) {
case 0:
break;
case 1:
*cfg |= (1 << 15);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_cfg->ie) {
case 0:
break;
case 1:
*cfg |= (1 << 14);
break;
default:
err = -EINVAL;
goto out;
}
switch (ch_cfg->flow_cntrl) {
case FC_MEM2MEM_DMA:
*cfg &= ~(7 << 11);
break;
case FC_MEM2PER_DMA:
*cfg &= ~(7 << 11);
*cfg |= (1 << 11);
break;
case FC_PER2MEM_DMA:
*cfg &= ~(7 << 11);
*cfg |= (2 << 11);
break;
case FC_PER2PER_DMA:
*cfg &= ~(7 << 11);
*cfg |= (3 << 11);
break;
case FC_PER2PER_DPER:
*cfg &= ~(7 << 11);
*cfg |= (4 << 11);
break;
case FC_MEM2PER_PER:
*cfg &= ~(7 << 11);
*cfg |= (5 << 11);
break;
case FC_PER2MEM_PER:
*cfg &= ~(7 << 11);
*cfg |= (6 << 11);
break;
case FC_PER2PER_SPER:
*cfg |= (7 << 11);
break;
default:
err = -EINVAL;
goto out;
}
*cfg &= ~(0x1f << 6);
*cfg |= ((ch_cfg->dest_per & 0x1f) << 6);
*cfg &= ~(0x1f << 1);
*cfg |= ((ch_cfg->src_per & 0x1f) << 1);
out:
return err;
}
EXPORT_SYMBOL_GPL(pnx4008_dma_pack_config);
int pnx4008_dma_parse_config(unsigned long cfg,
struct pnx4008_dma_ch_config * ch_cfg)
{
int err = 0;
if (!ch_cfg) {
err = -EINVAL;
goto out;
}
cfg >>= 1;
ch_cfg->src_per = cfg & 0x1f;
cfg >>= 5;
ch_cfg->dest_per = cfg & 0x1f;
cfg >>= 5;
switch (cfg & 7) {
case 0:
ch_cfg->flow_cntrl = FC_MEM2MEM_DMA;
break;
case 1:
ch_cfg->flow_cntrl = FC_MEM2PER_DMA;
break;
case 2:
ch_cfg->flow_cntrl = FC_PER2MEM_DMA;
break;
case 3:
ch_cfg->flow_cntrl = FC_PER2PER_DMA;
break;
case 4:
ch_cfg->flow_cntrl = FC_PER2PER_DPER;
break;
case 5:
ch_cfg->flow_cntrl = FC_MEM2PER_PER;
break;
case 6:
ch_cfg->flow_cntrl = FC_PER2MEM_PER;
break;
case 7:
ch_cfg->flow_cntrl = FC_PER2PER_SPER;
}
cfg >>= 3;
ch_cfg->ie = cfg & 1;
cfg >>= 1;
ch_cfg->itc = cfg & 1;
cfg >>= 1;
ch_cfg->lock = cfg & 1;
cfg >>= 1;
ch_cfg->active = cfg & 1;
cfg >>= 1;
ch_cfg->halt = cfg & 1;
out:
return err;
}
EXPORT_SYMBOL_GPL(pnx4008_dma_parse_config);
void pnx4008_dma_split_head_entry(struct pnx4008_dma_config * config,
struct pnx4008_dma_ch_ctrl * ctrl)
{
int new_len = ctrl->tr_size, num_entries = 0;
int old_len = new_len;
int src_width, dest_width, count = 1;
switch (ctrl->swidth) {
case WIDTH_BYTE:
src_width = 1;
break;
case WIDTH_HWORD:
src_width = 2;
break;
case WIDTH_WORD:
src_width = 4;
break;
default:
return;
}
switch (ctrl->dwidth) {
case WIDTH_BYTE:
dest_width = 1;
break;
case WIDTH_HWORD:
dest_width = 2;
break;
case WIDTH_WORD:
dest_width = 4;
break;
default:
return;
}
while (new_len > 0x7FF) {
num_entries++;
new_len = (ctrl->tr_size + num_entries) / (num_entries + 1);
}
if (num_entries != 0) {
struct pnx4008_dma_ll *ll = NULL;
config->ch_ctrl &= ~0x7ff;
config->ch_ctrl |= new_len;
if (!config->is_ll) {
config->is_ll = 1;
while (num_entries) {
if (!ll) {
config->ll =
pnx4008_alloc_ll_entry(&config->
ll_dma);
ll = config->ll;
} else {
ll->next =
pnx4008_alloc_ll_entry(&ll->
next_dma);
ll = ll->next;
}
if (ctrl->si)
ll->src_addr =
config->src_addr +
src_width * new_len * count;
else
ll->src_addr = config->src_addr;
if (ctrl->di)
ll->dest_addr =
config->dest_addr +
dest_width * new_len * count;
else
ll->dest_addr = config->dest_addr;
ll->ch_ctrl = config->ch_ctrl & 0x7fffffff;
ll->next_dma = 0;
ll->next = NULL;
num_entries--;
count++;
}
} else {
struct pnx4008_dma_ll *ll_old = config->ll;
unsigned long ll_dma_old = config->ll_dma;
while (num_entries) {
if (!ll) {
config->ll =
pnx4008_alloc_ll_entry(&config->
ll_dma);
ll = config->ll;
} else {
ll->next =
pnx4008_alloc_ll_entry(&ll->
next_dma);
ll = ll->next;
}
if (ctrl->si)
ll->src_addr =
config->src_addr +
src_width * new_len * count;
else
ll->src_addr = config->src_addr;
if (ctrl->di)
ll->dest_addr =
config->dest_addr +
dest_width * new_len * count;
else
ll->dest_addr = config->dest_addr;
ll->ch_ctrl = config->ch_ctrl & 0x7fffffff;
ll->next_dma = 0;
ll->next = NULL;
num_entries--;
count++;
}
ll->next_dma = ll_dma_old;
ll->next = ll_old;
}
/* adjust last length/tc */
ll->ch_ctrl = config->ch_ctrl & (~0x7ff);
ll->ch_ctrl |= old_len - new_len * (count - 1);
config->ch_ctrl &= 0x7fffffff;
}
}
EXPORT_SYMBOL_GPL(pnx4008_dma_split_head_entry);
void pnx4008_dma_split_ll_entry(struct pnx4008_dma_ll * cur_ll,
struct pnx4008_dma_ch_ctrl * ctrl)
{
int new_len = ctrl->tr_size, num_entries = 0;
int old_len = new_len;
int src_width, dest_width, count = 1;
switch (ctrl->swidth) {
case WIDTH_BYTE:
src_width = 1;
break;
case WIDTH_HWORD:
src_width = 2;
break;
case WIDTH_WORD:
src_width = 4;
break;
default:
return;
}
switch (ctrl->dwidth) {
case WIDTH_BYTE:
dest_width = 1;
break;
case WIDTH_HWORD:
dest_width = 2;
break;
case WIDTH_WORD:
dest_width = 4;
break;
default:
return;
}
while (new_len > 0x7FF) {
num_entries++;
new_len = (ctrl->tr_size + num_entries) / (num_entries + 1);
}
if (num_entries != 0) {
struct pnx4008_dma_ll *ll = NULL;
cur_ll->ch_ctrl &= ~0x7ff;
cur_ll->ch_ctrl |= new_len;
if (!cur_ll->next) {
while (num_entries) {
if (!ll) {
cur_ll->next =
pnx4008_alloc_ll_entry(&cur_ll->
next_dma);
ll = cur_ll->next;
} else {
ll->next =
pnx4008_alloc_ll_entry(&ll->
next_dma);
ll = ll->next;
}
if (ctrl->si)
ll->src_addr =
cur_ll->src_addr +
src_width * new_len * count;
else
ll->src_addr = cur_ll->src_addr;
if (ctrl->di)
ll->dest_addr =
cur_ll->dest_addr +
dest_width * new_len * count;
else
ll->dest_addr = cur_ll->dest_addr;
ll->ch_ctrl = cur_ll->ch_ctrl & 0x7fffffff;
ll->next_dma = 0;
ll->next = NULL;
num_entries--;
count++;
}
} else {
struct pnx4008_dma_ll *ll_old = cur_ll->next;
unsigned long ll_dma_old = cur_ll->next_dma;
while (num_entries) {
if (!ll) {
cur_ll->next =
pnx4008_alloc_ll_entry(&cur_ll->
next_dma);
ll = cur_ll->next;
} else {
ll->next =
pnx4008_alloc_ll_entry(&ll->
next_dma);
ll = ll->next;
}
if (ctrl->si)
ll->src_addr =
cur_ll->src_addr +
src_width * new_len * count;
else
ll->src_addr = cur_ll->src_addr;
if (ctrl->di)
ll->dest_addr =
cur_ll->dest_addr +
dest_width * new_len * count;
else
ll->dest_addr = cur_ll->dest_addr;
ll->ch_ctrl = cur_ll->ch_ctrl & 0x7fffffff;
ll->next_dma = 0;
ll->next = NULL;
num_entries--;
count++;
}
ll->next_dma = ll_dma_old;
ll->next = ll_old;
}
/* adjust last length/tc */
ll->ch_ctrl = cur_ll->ch_ctrl & (~0x7ff);
ll->ch_ctrl |= old_len - new_len * (count - 1);
cur_ll->ch_ctrl &= 0x7fffffff;
}
}
EXPORT_SYMBOL_GPL(pnx4008_dma_split_ll_entry);
int pnx4008_config_channel(int ch, struct pnx4008_dma_config * config)
{
if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
return -EINVAL;
pnx4008_dma_lock();
__raw_writel(config->src_addr, DMAC_Cx_SRC_ADDR(ch));
__raw_writel(config->dest_addr, DMAC_Cx_DEST_ADDR(ch));
if (config->is_ll)
__raw_writel(config->ll_dma, DMAC_Cx_LLI(ch));
else
__raw_writel(0, DMAC_Cx_LLI(ch));
__raw_writel(config->ch_ctrl, DMAC_Cx_CONTROL(ch));
__raw_writel(config->ch_cfg, DMAC_Cx_CONFIG(ch));
pnx4008_dma_unlock();
return 0;
}
EXPORT_SYMBOL_GPL(pnx4008_config_channel);
int pnx4008_channel_get_config(int ch, struct pnx4008_dma_config * config)
{
if (!VALID_CHANNEL(ch) || !dma_channels[ch].name || !config)
return -EINVAL;
pnx4008_dma_lock();
config->ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
config->ch_ctrl = __raw_readl(DMAC_Cx_CONTROL(ch));
config->ll_dma = __raw_readl(DMAC_Cx_LLI(ch));
config->is_ll = config->ll_dma ? 1 : 0;
config->src_addr = __raw_readl(DMAC_Cx_SRC_ADDR(ch));
config->dest_addr = __raw_readl(DMAC_Cx_DEST_ADDR(ch));
pnx4008_dma_unlock();
return 0;
}
EXPORT_SYMBOL_GPL(pnx4008_channel_get_config);
int pnx4008_dma_ch_enable(int ch)
{
unsigned long ch_cfg;
if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
return -EINVAL;
pnx4008_dma_lock();
ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
ch_cfg |= 1;
__raw_writel(ch_cfg, DMAC_Cx_CONFIG(ch));
pnx4008_dma_unlock();
return 0;
}
EXPORT_SYMBOL_GPL(pnx4008_dma_ch_enable);
int pnx4008_dma_ch_disable(int ch)
{
unsigned long ch_cfg;
if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
return -EINVAL;
pnx4008_dma_lock();
ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
ch_cfg &= ~1;
__raw_writel(ch_cfg, DMAC_Cx_CONFIG(ch));
pnx4008_dma_unlock();
return 0;
}
EXPORT_SYMBOL_GPL(pnx4008_dma_ch_disable);
int pnx4008_dma_ch_enabled(int ch)
{
unsigned long ch_cfg;
if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
return -EINVAL;
pnx4008_dma_lock();
ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
pnx4008_dma_unlock();
return ch_cfg & 1;
}
EXPORT_SYMBOL_GPL(pnx4008_dma_ch_enabled);
static irqreturn_t dma_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
{
int i;
unsigned long dint = __raw_readl(DMAC_INT_STAT);
unsigned long tcint = __raw_readl(DMAC_INT_TC_STAT);
unsigned long eint = __raw_readl(DMAC_INT_ERR_STAT);
unsigned long i_bit;
for (i = MAX_DMA_CHANNELS - 1; i >= 0; i--) {
i_bit = 1 << i;
if (dint & i_bit) {
struct dma_channel *channel = &dma_channels[i];
if (channel->name && channel->irq_handler) {
int cause = 0;
if (eint & i_bit)
cause |= DMA_ERR_INT;
if (tcint & i_bit)
cause |= DMA_TC_INT;
channel->irq_handler(i, cause, channel->data,
regs);
} else {
/*
* IRQ for an unregistered DMA channel
*/
printk(KERN_WARNING
"spurious IRQ for DMA channel %d\n", i);
}
if (tcint & i_bit)
__raw_writel(i_bit, DMAC_INT_TC_CLEAR);
if (eint & i_bit)
__raw_writel(i_bit, DMAC_INT_ERR_CLEAR);
}
}
return IRQ_HANDLED;
}
static int __init pnx4008_dma_init(void)
{
int ret, i;
ret = request_irq(DMA_INT, dma_irq_handler, 0, "DMA", NULL);
if (ret) {
printk(KERN_CRIT "Wow! Can't register IRQ for DMA\n");
goto out;
}
ll_pool.count = 0x4000 / sizeof(struct pnx4008_dma_ll);
ll_pool.cur = ll_pool.vaddr =
dma_alloc_coherent(NULL, ll_pool.count * sizeof(struct pnx4008_dma_ll),
&ll_pool.dma_addr, GFP_KERNEL);
if (!ll_pool.vaddr) {
ret = -ENOMEM;
free_irq(DMA_INT, NULL);
goto out;
}
for (i = 0; i < ll_pool.count - 1; i++) {
void **addr = ll_pool.vaddr + i * sizeof(struct pnx4008_dma_ll);
*addr = (void *)addr + sizeof(struct pnx4008_dma_ll);
}
*(long *)(ll_pool.vaddr +
(ll_pool.count - 1) * sizeof(struct pnx4008_dma_ll)) =
(long)ll_pool.vaddr;
__raw_writel(1, DMAC_CONFIG);
out:
return ret;
}
arch_initcall(pnx4008_dma_init);
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