[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / mach-msm / dma.c

/* 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/io.h>
#include <linux/interrupt.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 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);
	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]);
		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]))
			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.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);
					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);
					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);
					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]);
				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(INT_ADM_AARM);

	spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
	return IRQ_HANDLED;
}

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));
	}
	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);
Commit	Line	Data
bfe645ad AH	1	/* linux/arch/arm/mach-msm/dma.c
	2	*
	3	* Copyright (C) 2007 Google, Inc.
	4	*
	5	* This software is licensed under the terms of the GNU General Public
	6	* License version 2, as published by the Free Software Foundation, and
	7	* may be copied, distributed, and modified under those terms.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	*/
	15
fced80c7	16	#include <linux/io.h>
bfe645ad	17	#include <linux/interrupt.h>
a09e64fb	18	#include <mach/dma.h>
bfe645ad AH	19
	20	#define MSM_DMOV_CHANNEL_COUNT 16
	21
	22	enum {
	23	MSM_DMOV_PRINT_ERRORS = 1,
	24	MSM_DMOV_PRINT_IO = 2,
	25	MSM_DMOV_PRINT_FLOW = 4
	26	};
	27
	28	static DEFINE_SPINLOCK(msm_dmov_lock);
8a0f6f17	29	static unsigned int channel_active;
bfe645ad AH	30	static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
	31	static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
	32	unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS;
	33
	34	#define MSM_DMOV_DPRINTF(mask, format, args...) \
	35	do { \
	36	if ((mask) & msm_dmov_print_mask) \
	37	printk(KERN_ERR format, args); \
	38	} while (0)
	39	#define PRINT_ERROR(format, args...) \
	40	MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args);
	41	#define PRINT_IO(format, args...) \
	42	MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args);
	43	#define PRINT_FLOW(format, args...) \
	44	MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args);
	45
8a0f6f17 BS	46	void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
	47	{
	48	writel((graceful << 31), DMOV_FLUSH0(id));
	49	}
	50
bfe645ad AH	51	void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
	52	{
	53	unsigned long irq_flags;
	54	unsigned int status;
	55
	56	spin_lock_irqsave(&msm_dmov_lock, irq_flags);
	57	status = readl(DMOV_STATUS(id));
	58	if (list_empty(&ready_commands[id]) &&
	59	(status & DMOV_STATUS_CMD_PTR_RDY)) {
	60	#if 0
	61	if (list_empty(&active_commands[id])) {
	62	PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
	63	writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
	64	}
	65	#endif
	66	PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
	67	list_add_tail(&cmd->list, &active_commands[id]);
8a0f6f17 BS	68	if (!channel_active)
	69	enable_irq(INT_ADM_AARM);
	70	channel_active \|= 1U << id;
bfe645ad AH	71	writel(cmd->cmdptr, DMOV_CMD_PTR(id));
	72	} else {
	73	if (list_empty(&active_commands[id]))
	74	PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
	75
	76	PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
	77	list_add_tail(&cmd->list, &ready_commands[id]);
	78	}
	79	spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
	80	}
	81
	82	struct msm_dmov_exec_cmdptr_cmd {
	83	struct msm_dmov_cmd dmov_cmd;
	84	struct completion complete;
	85	unsigned id;
	86	unsigned int result;
8a0f6f17	87	struct msm_dmov_errdata err;
bfe645ad AH	88	};
bfe645ad AH	89
8a0f6f17 BS	90	static void
	91	dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
	92	unsigned int result,
	93	struct msm_dmov_errdata *err)
bfe645ad AH	94	{
	95	struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
	96	cmd->result = result;
8a0f6f17 BS	97	if (result != 0x80000002 && err)
	98	memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
	99
bfe645ad AH	100	complete(&cmd->complete);
	101	}
	102
	103	int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
	104	{
	105	struct msm_dmov_exec_cmdptr_cmd cmd;
	106
	107	PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
	108
	109	cmd.dmov_cmd.cmdptr = cmdptr;
	110	cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
	111	cmd.id = id;
	112	init_completion(&cmd.complete);
	113
	114	msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
	115	wait_for_completion(&cmd.complete);
	116
	117	if (cmd.result != 0x80000002) {
	118	PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
	119	PRINT_ERROR("dmov_exec_cmdptr(%d): flush: %x %x %x %x\n",
8a0f6f17	120	id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
bfe645ad AH	121	return -EIO;
	122	}
	123	PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
	124	return 0;
	125	}
	126
	127
	128	static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
	129	{
	130	unsigned int int_status, mask, id;
	131	unsigned long irq_flags;
	132	unsigned int ch_status;
	133	unsigned int ch_result;
	134	struct msm_dmov_cmd *cmd;
	135
	136	spin_lock_irqsave(&msm_dmov_lock, irq_flags);
	137
	138	int_status = readl(DMOV_ISR); /* read and clear interrupt */
	139	PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
	140
	141	while (int_status) {
	142	mask = int_status & -int_status;
	143	id = fls(mask) - 1;
	144	PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
	145	int_status &= ~mask;
	146	ch_status = readl(DMOV_STATUS(id));
	147	if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
	148	PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
	149	continue;
	150	}
	151	do {
	152	ch_result = readl(DMOV_RSLT(id));
	153	if (list_empty(&active_commands[id])) {
	154	PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
	155	"with no active command, status %x, result %x\n",
	156	id, ch_status, ch_result);
	157	cmd = NULL;
	158	} else
	159	cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
	160	PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
	161	if (ch_result & DMOV_RSLT_DONE) {
	162	PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
	163	id, ch_status);
	164	PRINT_IO("msm_datamover_irq_handler id %d, got result "
	165	"for %p, result %x\n", id, cmd, ch_result);
	166	if (cmd) {
	167	list_del(&cmd->list);
8a0f6f17	168	cmd->complete_func(cmd, ch_result, NULL);
bfe645ad AH	169	}
	170	}
	171	if (ch_result & DMOV_RSLT_FLUSH) {
8a0f6f17 BS	172	struct msm_dmov_errdata errdata;
	173
	174	errdata.flush[0] = readl(DMOV_FLUSH0(id));
	175	errdata.flush[1] = readl(DMOV_FLUSH1(id));
	176	errdata.flush[2] = readl(DMOV_FLUSH2(id));
	177	errdata.flush[3] = readl(DMOV_FLUSH3(id));
	178	errdata.flush[4] = readl(DMOV_FLUSH4(id));
	179	errdata.flush[5] = readl(DMOV_FLUSH5(id));
bfe645ad	180	PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
8a0f6f17	181	PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
bfe645ad AH	182	if (cmd) {
bfe645ad AH	183	list_del(&cmd->list);
8a0f6f17	184	cmd->complete_func(cmd, ch_result, &errdata);
bfe645ad AH	185	}
	186	}
	187	if (ch_result & DMOV_RSLT_ERROR) {
8a0f6f17 BS	188	struct msm_dmov_errdata errdata;
	189
	190	errdata.flush[0] = readl(DMOV_FLUSH0(id));
	191	errdata.flush[1] = readl(DMOV_FLUSH1(id));
	192	errdata.flush[2] = readl(DMOV_FLUSH2(id));
	193	errdata.flush[3] = readl(DMOV_FLUSH3(id));
	194	errdata.flush[4] = readl(DMOV_FLUSH4(id));
	195	errdata.flush[5] = readl(DMOV_FLUSH5(id));
	196
bfe645ad	197	PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
8a0f6f17	198	PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
bfe645ad AH	199	if (cmd) {
bfe645ad AH	200	list_del(&cmd->list);
8a0f6f17	201	cmd->complete_func(cmd, ch_result, &errdata);
bfe645ad AH	202	}
	203	/* this does not seem to work, once we get an error */
	204	/* the datamover will no longer accept commands */
	205	writel(0, DMOV_FLUSH0(id));
	206	}
	207	ch_status = readl(DMOV_STATUS(id));
	208	PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
	209	if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
	210	cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
	211	list_del(&cmd->list);
	212	list_add_tail(&cmd->list, &active_commands[id]);
	213	PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
	214	writel(cmd->cmdptr, DMOV_CMD_PTR(id));
	215	}
	216	} while (ch_status & DMOV_STATUS_RSLT_VALID);
8a0f6f17 BS	217	if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
8a0f6f17 BS	218	channel_active &= ~(1U << id);
bfe645ad AH	219	PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
bfe645ad AH	220	}
8a0f6f17 BS	221
	222	if (!channel_active)
	223	disable_irq(INT_ADM_AARM);
	224
bfe645ad AH	225	spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
	226	return IRQ_HANDLED;
	227	}
	228
	229	static int __init msm_init_datamover(void)
	230	{
	231	int i;
8a0f6f17	232	int ret;
bfe645ad AH	233	for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
	234	INIT_LIST_HEAD(&ready_commands[i]);
	235	INIT_LIST_HEAD(&active_commands[i]);
	236	writel(DMOV_CONFIG_IRQ_EN \| DMOV_CONFIG_FORCE_TOP_PTR_RSLT \| DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
	237	}
8a0f6f17 BS	238	ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
	239	if (ret)
	240	return ret;
	241	disable_irq(INT_ADM_AARM);
	242	return 0;
bfe645ad AH	243	}
	244
	245	arch_initcall(msm_init_datamover);
	246