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/* linux/arch/arm/mach-msm/dma.c
*
* Copyright (C) 2007 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <mach/dma.h>
#define MSM_DMOV_CHANNEL_COUNT 16
enum {
MSM_DMOV_PRINT_ERRORS = 1,
MSM_DMOV_PRINT_IO = 2,
MSM_DMOV_PRINT_FLOW = 4
};
static DEFINE_SPINLOCK(msm_dmov_lock);
static struct clk *msm_dmov_clk;
static unsigned int channel_active;
static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS;
#define MSM_DMOV_DPRINTF(mask, format, args...) \
do { \
if ((mask) & msm_dmov_print_mask) \
printk(KERN_ERR format, args); \
} while (0)
#define PRINT_ERROR(format, args...) \
MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args);
#define PRINT_IO(format, args...) \
MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args);
#define PRINT_FLOW(format, args...) \
MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args);
void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
{
writel((graceful << 31), DMOV_FLUSH0(id));
}
void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
{
unsigned long irq_flags;
unsigned int status;
spin_lock_irqsave(&msm_dmov_lock, irq_flags);
if (!channel_active)
clk_enable(msm_dmov_clk);
dsb();
status = readl(DMOV_STATUS(id));
if (list_empty(&ready_commands[id]) &&
(status & DMOV_STATUS_CMD_PTR_RDY)) {
#if 0
if (list_empty(&active_commands[id])) {
PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
}
#endif
if (cmd->execute_func)
cmd->execute_func(cmd);
PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
list_add_tail(&cmd->list, &active_commands[id]);
if (!channel_active)
enable_irq(INT_ADM_AARM);
channel_active |= 1U << id;
writel(cmd->cmdptr, DMOV_CMD_PTR(id));
} else {
if (!channel_active)
clk_disable(msm_dmov_clk);
if (list_empty(&active_commands[id]))
PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
list_add_tail(&cmd->list, &ready_commands[id]);
}
spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
}
struct msm_dmov_exec_cmdptr_cmd {
struct msm_dmov_cmd dmov_cmd;
struct completion complete;
unsigned id;
unsigned int result;
struct msm_dmov_errdata err;
};
static void
dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
unsigned int result,
struct msm_dmov_errdata *err)
{
struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
cmd->result = result;
if (result != 0x80000002 && err)
memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
complete(&cmd->complete);
}
int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
{
struct msm_dmov_exec_cmdptr_cmd cmd;
PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
cmd.dmov_cmd.cmdptr = cmdptr;
cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
cmd.dmov_cmd.execute_func = NULL;
cmd.id = id;
init_completion(&cmd.complete);
msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
wait_for_completion(&cmd.complete);
if (cmd.result != 0x80000002) {
PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
PRINT_ERROR("dmov_exec_cmdptr(%d): flush: %x %x %x %x\n",
id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
return -EIO;
}
PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
return 0;
}
static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
{
unsigned int int_status, mask, id;
unsigned long irq_flags;
unsigned int ch_status;
unsigned int ch_result;
struct msm_dmov_cmd *cmd;
spin_lock_irqsave(&msm_dmov_lock, irq_flags);
int_status = readl(DMOV_ISR); /* read and clear interrupt */
PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
while (int_status) {
mask = int_status & -int_status;
id = fls(mask) - 1;
PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
int_status &= ~mask;
ch_status = readl(DMOV_STATUS(id));
if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
continue;
}
do {
ch_result = readl(DMOV_RSLT(id));
if (list_empty(&active_commands[id])) {
PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
"with no active command, status %x, result %x\n",
id, ch_status, ch_result);
cmd = NULL;
} else
cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
if (ch_result & DMOV_RSLT_DONE) {
PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
id, ch_status);
PRINT_IO("msm_datamover_irq_handler id %d, got result "
"for %p, result %x\n", id, cmd, ch_result);
if (cmd) {
list_del(&cmd->list);
dsb();
cmd->complete_func(cmd, ch_result, NULL);
}
}
if (ch_result & DMOV_RSLT_FLUSH) {
struct msm_dmov_errdata errdata;
errdata.flush[0] = readl(DMOV_FLUSH0(id));
errdata.flush[1] = readl(DMOV_FLUSH1(id));
errdata.flush[2] = readl(DMOV_FLUSH2(id));
errdata.flush[3] = readl(DMOV_FLUSH3(id));
errdata.flush[4] = readl(DMOV_FLUSH4(id));
errdata.flush[5] = readl(DMOV_FLUSH5(id));
PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
if (cmd) {
list_del(&cmd->list);
dsb();
cmd->complete_func(cmd, ch_result, &errdata);
}
}
if (ch_result & DMOV_RSLT_ERROR) {
struct msm_dmov_errdata errdata;
errdata.flush[0] = readl(DMOV_FLUSH0(id));
errdata.flush[1] = readl(DMOV_FLUSH1(id));
errdata.flush[2] = readl(DMOV_FLUSH2(id));
errdata.flush[3] = readl(DMOV_FLUSH3(id));
errdata.flush[4] = readl(DMOV_FLUSH4(id));
errdata.flush[5] = readl(DMOV_FLUSH5(id));
PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
if (cmd) {
list_del(&cmd->list);
dsb();
cmd->complete_func(cmd, ch_result, &errdata);
}
/* this does not seem to work, once we get an error */
/* the datamover will no longer accept commands */
writel(0, DMOV_FLUSH0(id));
}
ch_status = readl(DMOV_STATUS(id));
PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
list_del(&cmd->list);
list_add_tail(&cmd->list, &active_commands[id]);
if (cmd->execute_func)
cmd->execute_func(cmd);
PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
writel(cmd->cmdptr, DMOV_CMD_PTR(id));
}
} while (ch_status & DMOV_STATUS_RSLT_VALID);
if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
channel_active &= ~(1U << id);
PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
}
if (!channel_active) {
disable_irq_nosync(INT_ADM_AARM);
clk_disable(msm_dmov_clk);
}
spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
return IRQ_HANDLED;
}
static int __init msm_init_datamover(void)
{
int i;
int ret;
struct clk *clk;
for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
INIT_LIST_HEAD(&ready_commands[i]);
INIT_LIST_HEAD(&active_commands[i]);
writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
}
clk = clk_get(NULL, "adm_clk");
if (IS_ERR(clk))
return PTR_ERR(clk);
msm_dmov_clk = clk;
ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
if (ret)
return ret;
disable_irq(INT_ADM_AARM);
return 0;
}
arch_initcall(msm_init_datamover);
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