[ARM] msm: dma support for MSM7X00A

Signed-off-by: Brian Swetland <swetland@google.com>

2 files changed, 215 insertions, 1 deletions

diff --git a/arch/arm/mach-msm/Makefile b/arch/arm/mach-msm/Makefile
index fcca853d6485..d12f23655850 100644
--- a/arch/arm/mach-msm/Makefile
+++ b/arch/arm/mach-msm/Makefile
@@ -1,4 +1,4 @@
-obj-y += io.o idle.o irq.o timer.o
+obj-y += io.o idle.o irq.o timer.o dma.o
 
 # Common code for board init
 obj-y += common.o
diff --git a/arch/arm/mach-msm/dma.c b/arch/arm/mach-msm/dma.c
new file mode 100644
index 000000000000..8b0f339b3274
--- /dev/null
+++ b/arch/arm/mach-msm/dma.c
@@ -0,0 +1,214 @@
+/* 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 <asm/io.h>
+#include <linux/interrupt.h>
+#include <asm/arch/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 msm_dmov_cmd active_command;
+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_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
+{
+        unsigned long irq_flags;
+        unsigned int status;
+
+        spin_lock_irqsave(&msm_dmov_lock, irq_flags);
+        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
+                PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
+                list_add_tail(&cmd->list, &active_commands[id]);
+                writel(cmd->cmdptr, DMOV_CMD_PTR(id));
+        } else {
+                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;
+        unsigned int flush[6];
+};
+
+static void dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd, unsigned int result)
+{
+        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));
+        }
+        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.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.flush[0], cmd.flush[1], cmd.flush[2], cmd.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);
+                                        cmd->complete_func(cmd, ch_result);
+                                }
+                        }
+                        if (ch_result & DMOV_RSLT_FLUSH) {
+                                unsigned int flush0 = readl(DMOV_FLUSH0(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);
+                                if (cmd) {
+                                        list_del(&cmd->list);
+                                        cmd->complete_func(cmd, ch_result);
+                                }
+                        }
+                        if (ch_result & DMOV_RSLT_ERROR) {
+                                unsigned int flush0 = readl(DMOV_FLUSH0(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);
+                                if (cmd) {
+                                        list_del(&cmd->list);
+                                        cmd->complete_func(cmd, ch_result);
+                                }
+                                /* 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]);
+                                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);
+                PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
+        }
+        spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
+        return IRQ_HANDLED;
+}
+
+static int __init msm_init_datamover(void)
+{
+        int i;
+        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);
+}
+
+arch_initcall(msm_init_datamover);
+