--- /dev/null
+/* 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);
+
+/* linux/include/asm-arm/arch-msm/dma.h
+ *
+ * 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.
+ *
+ */
+#ifndef __ASM_ARCH_MSM_DMA_H
+
+#include <linux/list.h>
+#include <asm/arch/msm_iomap.h>
+
+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 msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd);
+void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd);
+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); */
+
+
+
+#define DMOV_SD0(off, ch) (MSM_DMOV_BASE + 0x0000 + (off) + ((ch) << 2))
+#define DMOV_SD1(off, ch) (MSM_DMOV_BASE + 0x0400 + (off) + ((ch) << 2))
+#define DMOV_SD2(off, ch) (MSM_DMOV_BASE + 0x0800 + (off) + ((ch) << 2))
+#define DMOV_SD3(off, ch) (MSM_DMOV_BASE + 0x0C00 + (off) + ((ch) << 2))
+
+/* only security domain 3 is available to the ARM11
+ * SD0 -> mARM trusted, SD1 -> mARM nontrusted, SD2 -> aDSP, SD3 -> aARM
+ */
+
+#define DMOV_CMD_PTR(ch) DMOV_SD3(0x000, ch)
+#define DMOV_CMD_LIST (0 << 29) /* does not work */
+#define DMOV_CMD_PTR_LIST (1 << 29) /* works */
+#define DMOV_CMD_INPUT_CFG (2 << 29) /* untested */
+#define DMOV_CMD_OUTPUT_CFG (3 << 29) /* untested */
+#define DMOV_CMD_ADDR(addr) ((addr) >> 3)
+
+#define DMOV_RSLT(ch) DMOV_SD3(0x040, ch)
+#define DMOV_RSLT_VALID (1 << 31) /* 0 == host has empties result fifo */
+#define DMOV_RSLT_ERROR (1 << 3)
+#define DMOV_RSLT_FLUSH (1 << 2)
+#define DMOV_RSLT_DONE (1 << 1) /* top pointer done */
+#define DMOV_RSLT_USER (1 << 0) /* command with FR force result */
+
+#define DMOV_FLUSH0(ch) DMOV_SD3(0x080, ch)
+#define DMOV_FLUSH1(ch) DMOV_SD3(0x0C0, ch)
+#define DMOV_FLUSH2(ch) DMOV_SD3(0x100, ch)
+#define DMOV_FLUSH3(ch) DMOV_SD3(0x140, ch)
+#define DMOV_FLUSH4(ch) DMOV_SD3(0x180, ch)
+#define DMOV_FLUSH5(ch) DMOV_SD3(0x1C0, ch)
+
+#define DMOV_STATUS(ch) DMOV_SD3(0x200, ch)
+#define DMOV_STATUS_RSLT_COUNT(n) (((n) >> 29))
+#define DMOV_STATUS_CMD_COUNT(n) (((n) >> 27) & 3)
+#define DMOV_STATUS_RSLT_VALID (1 << 1)
+#define DMOV_STATUS_CMD_PTR_RDY (1 << 0)
+
+#define DMOV_ISR DMOV_SD3(0x380, 0)
+
+#define DMOV_CONFIG(ch) DMOV_SD3(0x300, ch)
+#define DMOV_CONFIG_FORCE_TOP_PTR_RSLT (1 << 2)
+#define DMOV_CONFIG_FORCE_FLUSH_RSLT (1 << 1)
+#define DMOV_CONFIG_IRQ_EN (1 << 0)
+
+/* channel assignments */
+
+#define DMOV_NAND_CHAN 7
+#define DMOV_NAND_CRCI_CMD 5
+#define DMOV_NAND_CRCI_DATA 4
+
+#define DMOV_SDC1_CHAN 8
+#define DMOV_SDC1_CRCI 6
+
+#define DMOV_SDC2_CHAN 8
+#define DMOV_SDC2_CRCI 7
+
+#define DMOV_TSIF_CHAN 10
+#define DMOV_TSIF_CRCI 10
+
+#define DMOV_USB_CHAN 11
+
+/* no client rate control ifc (eg, ram) */
+#define DMOV_NONE_CRCI 0
+
+
+/* If the CMD_PTR register has CMD_PTR_LIST selected, the data mover
+ * is going to walk a list of 32bit pointers as described below. Each
+ * pointer points to a *array* of dmov_s, etc structs. The last pointer
+ * in the list is marked with CMD_PTR_LP. The last struct in each array
+ * is marked with CMD_LC (see below).
+ */
+#define CMD_PTR_ADDR(addr) ((addr) >> 3)
+#define CMD_PTR_LP (1 << 31) /* last pointer */
+#define CMD_PTR_PT (3 << 29) /* ? */
+
+/* Single Item Mode */
+typedef struct {
+ unsigned cmd;
+ unsigned src;
+ unsigned dst;
+ unsigned len;
+} dmov_s;
+
+/* Scatter/Gather Mode */
+typedef struct {
+ unsigned cmd;
+ unsigned src_dscr;
+ unsigned dst_dscr;
+ unsigned _reserved;
+} dmov_sg;
+
+/* bits for the cmd field of the above structures */
+
+#define CMD_LC (1 << 31) /* last command */
+#define CMD_FR (1 << 22) /* force result -- does not work? */
+#define CMD_OCU (1 << 21) /* other channel unblock */
+#define CMD_OCB (1 << 20) /* other channel block */
+#define CMD_TCB (1 << 19) /* ? */
+#define CMD_DAH (1 << 18) /* destination address hold -- does not work?*/
+#define CMD_SAH (1 << 17) /* source address hold -- does not work? */
+
+#define CMD_MODE_SINGLE (0 << 0) /* dmov_s structure used */
+#define CMD_MODE_SG (1 << 0) /* untested */
+#define CMD_MODE_IND_SG (2 << 0) /* untested */
+#define CMD_MODE_BOX (3 << 0) /* untested */
+
+#define CMD_DST_SWAP_BYTES (1 << 14) /* exchange each byte n with byte n+1 */
+#define CMD_DST_SWAP_SHORTS (1 << 15) /* exchange each short n with short n+1 */
+#define CMD_DST_SWAP_WORDS (1 << 16) /* exchange each word n with word n+1 */
+
+#define CMD_SRC_SWAP_BYTES (1 << 11) /* exchange each byte n with byte n+1 */
+#define CMD_SRC_SWAP_SHORTS (1 << 12) /* exchange each short n with short n+1 */
+#define CMD_SRC_SWAP_WORDS (1 << 13) /* exchange each word n with word n+1 */
+
+#define CMD_DST_CRCI(n) (((n) & 15) << 7)
+#define CMD_SRC_CRCI(n) (((n) & 15) << 3)
+
+#endif
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