arch/arm/mach-msm/dma.c - maze/linux - Git at Google

 /* 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);
	/* 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);