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 
16 #include <linux/clk.h>
17 #include <linux/err.h>
18 #include <linux/io.h>
19 #include <linux/interrupt.h>
20 #include <linux/completion.h>
21 #include <mach/dma.h>
22 
23 #define MSM_DMOV_CHANNEL_COUNT 16
24 
25 enum {
26 	MSM_DMOV_PRINT_ERRORS = 1,
27 	MSM_DMOV_PRINT_IO = 2,
28 	MSM_DMOV_PRINT_FLOW = 4
29 };
30 
31 static DEFINE_SPINLOCK(msm_dmov_lock);
32 static struct clk *msm_dmov_clk;
33 static unsigned int channel_active;
34 static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
35 static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
36 unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS;
37 
38 #define MSM_DMOV_DPRINTF(mask, format, args...) \
39 	do { \
40 		if ((mask) & msm_dmov_print_mask) \
41 			printk(KERN_ERR format, args); \
42 	} while (0)
43 #define PRINT_ERROR(format, args...) \
44 	MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args);
45 #define PRINT_IO(format, args...) \
46 	MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args);
47 #define PRINT_FLOW(format, args...) \
48 	MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args);
49 
msm_dmov_stop_cmd(unsigned id,struct msm_dmov_cmd * cmd,int graceful)50 void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
51 {
52 	writel((graceful << 31), DMOV_FLUSH0(id));
53 }
54 
msm_dmov_enqueue_cmd(unsigned id,struct msm_dmov_cmd * cmd)55 void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
56 {
57 	unsigned long irq_flags;
58 	unsigned int status;
59 
60 	spin_lock_irqsave(&msm_dmov_lock, irq_flags);
61 	if (!channel_active)
62 		clk_enable(msm_dmov_clk);
63 	dsb();
64 	status = readl(DMOV_STATUS(id));
65 	if (list_empty(&ready_commands[id]) &&
66 		(status & DMOV_STATUS_CMD_PTR_RDY)) {
67 #if 0
68 		if (list_empty(&active_commands[id])) {
69 			PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
70 			writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
71 		}
72 #endif
73 		if (cmd->execute_func)
74 			cmd->execute_func(cmd);
75 		PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
76 		list_add_tail(&cmd->list, &active_commands[id]);
77 		if (!channel_active)
78 			enable_irq(INT_ADM_AARM);
79 		channel_active |= 1U << id;
80 		writel(cmd->cmdptr, DMOV_CMD_PTR(id));
81 	} else {
82 		if (!channel_active)
83 			clk_disable(msm_dmov_clk);
84 		if (list_empty(&active_commands[id]))
85 			PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
86 
87 		PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
88 		list_add_tail(&cmd->list, &ready_commands[id]);
89 	}
90 	spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
91 }
92 
93 struct msm_dmov_exec_cmdptr_cmd {
94 	struct msm_dmov_cmd dmov_cmd;
95 	struct completion complete;
96 	unsigned id;
97 	unsigned int result;
98 	struct msm_dmov_errdata err;
99 };
100 
101 static void
dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd * _cmd,unsigned int result,struct msm_dmov_errdata * err)102 dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
103 			       unsigned int result,
104 			       struct msm_dmov_errdata *err)
105 {
106 	struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
107 	cmd->result = result;
108 	if (result != 0x80000002 && err)
109 		memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
110 
111 	complete(&cmd->complete);
112 }
113 
msm_dmov_exec_cmd(unsigned id,unsigned int cmdptr)114 int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
115 {
116 	struct msm_dmov_exec_cmdptr_cmd cmd;
117 
118 	PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
119 
120 	cmd.dmov_cmd.cmdptr = cmdptr;
121 	cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
122 	cmd.dmov_cmd.execute_func = NULL;
123 	cmd.id = id;
124 	init_completion(&cmd.complete);
125 
126 	msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
127 	wait_for_completion(&cmd.complete);
128 
129 	if (cmd.result != 0x80000002) {
130 		PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
131 		PRINT_ERROR("dmov_exec_cmdptr(%d):  flush: %x %x %x %x\n",
132 			id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
133 		return -EIO;
134 	}
135 	PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
136 	return 0;
137 }
138 
139 
msm_datamover_irq_handler(int irq,void * dev_id)140 static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
141 {
142 	unsigned int int_status, mask, id;
143 	unsigned long irq_flags;
144 	unsigned int ch_status;
145 	unsigned int ch_result;
146 	struct msm_dmov_cmd *cmd;
147 
148 	spin_lock_irqsave(&msm_dmov_lock, irq_flags);
149 
150 	int_status = readl(DMOV_ISR); /* read and clear interrupt */
151 	PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
152 
153 	while (int_status) {
154 		mask = int_status & -int_status;
155 		id = fls(mask) - 1;
156 		PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
157 		int_status &= ~mask;
158 		ch_status = readl(DMOV_STATUS(id));
159 		if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
160 			PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
161 			continue;
162 		}
163 		do {
164 			ch_result = readl(DMOV_RSLT(id));
165 			if (list_empty(&active_commands[id])) {
166 				PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
167 					"with no active command, status %x, result %x\n",
168 					id, ch_status, ch_result);
169 				cmd = NULL;
170 			} else
171 				cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
172 			PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
173 			if (ch_result & DMOV_RSLT_DONE) {
174 				PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
175 					id, ch_status);
176 				PRINT_IO("msm_datamover_irq_handler id %d, got result "
177 					"for %p, result %x\n", id, cmd, ch_result);
178 				if (cmd) {
179 					list_del(&cmd->list);
180 					dsb();
181 					cmd->complete_func(cmd, ch_result, NULL);
182 				}
183 			}
184 			if (ch_result & DMOV_RSLT_FLUSH) {
185 				struct msm_dmov_errdata errdata;
186 
187 				errdata.flush[0] = readl(DMOV_FLUSH0(id));
188 				errdata.flush[1] = readl(DMOV_FLUSH1(id));
189 				errdata.flush[2] = readl(DMOV_FLUSH2(id));
190 				errdata.flush[3] = readl(DMOV_FLUSH3(id));
191 				errdata.flush[4] = readl(DMOV_FLUSH4(id));
192 				errdata.flush[5] = readl(DMOV_FLUSH5(id));
193 				PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
194 				PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
195 				if (cmd) {
196 					list_del(&cmd->list);
197 					dsb();
198 					cmd->complete_func(cmd, ch_result, &errdata);
199 				}
200 			}
201 			if (ch_result & DMOV_RSLT_ERROR) {
202 				struct msm_dmov_errdata errdata;
203 
204 				errdata.flush[0] = readl(DMOV_FLUSH0(id));
205 				errdata.flush[1] = readl(DMOV_FLUSH1(id));
206 				errdata.flush[2] = readl(DMOV_FLUSH2(id));
207 				errdata.flush[3] = readl(DMOV_FLUSH3(id));
208 				errdata.flush[4] = readl(DMOV_FLUSH4(id));
209 				errdata.flush[5] = readl(DMOV_FLUSH5(id));
210 
211 				PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
212 				PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
213 				if (cmd) {
214 					list_del(&cmd->list);
215 					dsb();
216 					cmd->complete_func(cmd, ch_result, &errdata);
217 				}
218 				/* this does not seem to work, once we get an error */
219 				/* the datamover will no longer accept commands */
220 				writel(0, DMOV_FLUSH0(id));
221 			}
222 			ch_status = readl(DMOV_STATUS(id));
223 			PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
224 			if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
225 				cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
226 				list_del(&cmd->list);
227 				list_add_tail(&cmd->list, &active_commands[id]);
228 				if (cmd->execute_func)
229 					cmd->execute_func(cmd);
230 				PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
231 				writel(cmd->cmdptr, DMOV_CMD_PTR(id));
232 			}
233 		} while (ch_status & DMOV_STATUS_RSLT_VALID);
234 		if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
235 			channel_active &= ~(1U << id);
236 		PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
237 	}
238 
239 	if (!channel_active) {
240 		disable_irq_nosync(INT_ADM_AARM);
241 		clk_disable(msm_dmov_clk);
242 	}
243 
244 	spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
245 	return IRQ_HANDLED;
246 }
247 
msm_init_datamover(void)248 static int __init msm_init_datamover(void)
249 {
250 	int i;
251 	int ret;
252 	struct clk *clk;
253 
254 	for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
255 		INIT_LIST_HEAD(&ready_commands[i]);
256 		INIT_LIST_HEAD(&active_commands[i]);
257 		writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
258 	}
259 	clk = clk_get(NULL, "adm_clk");
260 	if (IS_ERR(clk))
261 		return PTR_ERR(clk);
262 	msm_dmov_clk = clk;
263 	ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
264 	if (ret)
265 		return ret;
266 	disable_irq(INT_ADM_AARM);
267 	return 0;
268 }
269 
270 arch_initcall(msm_init_datamover);
271 
272