[ARM] msm: dma: various basic dma improvements and bugfixes

San:
- Propagate DM errors to the originator of the request.
- Implement msm_dmov_stop_cmd()
- Add return value to init code
- Modify msm_dmov_stop_cmd() to support ungraceful flushing

Arve:
- Disable datamover interrupt when not in use.
  We turn off the interrrupt to allow power collapse from idle.

Signed-off-by: San Mehat <san@android.com>
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Brian Swetland <swetland@google.com>

diff --git a/arch/arm/mach-msm/dma.c b/arch/arm/mach-msm/dma.c
index 0c8f252..f5420f9 100644 (file)
--- a/arch/arm/mach-msm/dma.c
+++ b/arch/arm/mach-msm/dma.c
@@ -26,7 +26,7 @@ enum {
 };
 
 static DEFINE_SPINLOCK(msm_dmov_lock);
-static struct msm_dmov_cmd active_command;
+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;
@@ -43,6 +43,11 @@ unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS;
 #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;
@@ -60,6 +65,9 @@ void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
 #endif
                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 (list_empty(&active_commands[id]))
@@ -76,21 +84,19 @@ struct msm_dmov_exec_cmdptr_cmd {
        struct completion complete;
        unsigned id;
        unsigned int result;
-       unsigned int flush[6];
+       struct msm_dmov_errdata err;
 };
 
-static void dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd, unsigned int result)
+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) {
-               cmd->flush[0] = readl(DMOV_FLUSH0(cmd->id));
-               cmd->flush[1] = readl(DMOV_FLUSH1(cmd->id));
-               cmd->flush[2] = readl(DMOV_FLUSH2(cmd->id));
-               cmd->flush[3] = readl(DMOV_FLUSH3(cmd->id));
-               cmd->flush[4] = readl(DMOV_FLUSH4(cmd->id));
-               cmd->flush[5] = readl(DMOV_FLUSH5(cmd->id));
-       }
+       if (result != 0x80000002 && err)
+               memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
+
        complete(&cmd->complete);
 }
 
@@ -111,7 +117,7 @@ int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
        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.flush[0], cmd.flush[1], cmd.flush[2], cmd.flush[3]);
+                       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);
@@ -159,25 +165,40 @@ static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
                                        "for %p, result %x\n", id, cmd, ch_result);
                                if (cmd) {
                                        list_del(&cmd->list);
-                                       cmd->complete_func(cmd, ch_result);
+                                       cmd->complete_func(cmd, ch_result, NULL);
                                }
                        }
                        if (ch_result & DMOV_RSLT_FLUSH) {
-                               unsigned int flush0 = readl(DMOV_FLUSH0(id));
+                               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, flush0);
+                               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);
-                                       cmd->complete_func(cmd, ch_result);
+                                       cmd->complete_func(cmd, ch_result, &errdata);
                                }
                        }
                        if (ch_result & DMOV_RSLT_ERROR) {
-                               unsigned int flush0 = readl(DMOV_FLUSH0(id));
+                               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, flush0);
+                               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);
-                                       cmd->complete_func(cmd, ch_result);
+                                       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 */
@@ -193,8 +214,14 @@ static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_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(INT_ADM_AARM);
+
        spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
        return IRQ_HANDLED;
 }
@@ -202,12 +229,17 @@ static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
 static int __init msm_init_datamover(void)
 {
        int i;
+       int ret;
        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));
        }
-       return request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
+       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);

diff --git a/arch/arm/mach-msm/include/mach/dma.h b/arch/arm/mach-msm/include/mach/dma.h
index ad1c87f..5ab5bdf 100644 (file)
--- a/arch/arm/mach-msm/include/mach/dma.h
+++ b/arch/arm/mach-msm/include/mach/dma.h
@@ -1,4 +1,4 @@
-/* arch/arm/mach-msm/include/mach/dma.h
+/* linux/include/asm-arm/arch-msm/dma.h
  *
  * Copyright (C) 2007 Google, Inc.
  *
@@ -18,17 +18,21 @@
 #include <linux/list.h>
 #include <mach/msm_iomap.h>
 
+struct msm_dmov_errdata {
+       uint32_t flush[6];
+};
+
 struct msm_dmov_cmd {
        struct list_head list;
        unsigned int cmdptr;
-       void (*complete_func)(struct msm_dmov_cmd *cmd, unsigned int result);
-/*     void (*user_result_func)(struct msm_dmov_cmd *cmd); */
+       void (*complete_func)(struct msm_dmov_cmd *cmd,
+                             unsigned int result,
+                             struct msm_dmov_errdata *err);
 };
 
 void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd);
-void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd);
+void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful);
 int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr);
-/* int msm_dmov_exec_cmd_etc(unsigned id, unsigned int cmdptr, int timeout, int interruptible); */
 
 
 
@@ -122,6 +126,16 @@ typedef struct {
        unsigned _reserved;
 } dmov_sg;
 
+/* Box mode */
+typedef struct {
+       uint32_t cmd;
+       uint32_t src_row_addr;
+       uint32_t dst_row_addr;
+       uint32_t src_dst_len;
+       uint32_t num_rows;
+       uint32_t row_offset;
+} dmov_box;
+
 /* bits for the cmd field of the above structures */
 
 #define CMD_LC      (1 << 31)  /* last command */