+++ /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 <linux/clk.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/interrupt.h>
-#include <linux/completion.h>
-#include <linux/module.h>
-#include <mach/dma.h>
-#include <mach/msm_iomap.h>
-
-#define MSM_DMOV_CHANNEL_COUNT 16
-
-#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))
-
-#if defined(CONFIG_ARCH_MSM7X30)
-#define DMOV_SD_AARM DMOV_SD2
-#else
-#define DMOV_SD_AARM DMOV_SD3
-#endif
-
-#define DMOV_CMD_PTR(ch) DMOV_SD_AARM(0x000, ch)
-#define DMOV_RSLT(ch) DMOV_SD_AARM(0x040, ch)
-#define DMOV_FLUSH0(ch) DMOV_SD_AARM(0x080, ch)
-#define DMOV_FLUSH1(ch) DMOV_SD_AARM(0x0C0, ch)
-#define DMOV_FLUSH2(ch) DMOV_SD_AARM(0x100, ch)
-#define DMOV_FLUSH3(ch) DMOV_SD_AARM(0x140, ch)
-#define DMOV_FLUSH4(ch) DMOV_SD_AARM(0x180, ch)
-#define DMOV_FLUSH5(ch) DMOV_SD_AARM(0x1C0, ch)
-
-#define DMOV_STATUS(ch) DMOV_SD_AARM(0x200, ch)
-#define DMOV_ISR DMOV_SD_AARM(0x380, 0)
-
-#define DMOV_CONFIG(ch) DMOV_SD_AARM(0x300, ch)
-
-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));
-}
-EXPORT_SYMBOL_GPL(msm_dmov_stop_cmd);
-
-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);
-}
-EXPORT_SYMBOL_GPL(msm_dmov_enqueue_cmd);
-
-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_move_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);
- clk_prepare(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;
-}
-module_init(msm_init_datamover);
projects / firefly-linux-kernel-4.4.55.git / blobdiff