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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 <asm/io.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <asm/arch/dma.h> | |
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); | |
29 | static struct msm_dmov_cmd active_command; | |
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 | ||
46 | void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd) | |
47 | { | |
48 | unsigned long irq_flags; | |
49 | unsigned int status; | |
50 | ||
51 | spin_lock_irqsave(&msm_dmov_lock, irq_flags); | |
52 | status = readl(DMOV_STATUS(id)); | |
53 | if (list_empty(&ready_commands[id]) && | |
54 | (status & DMOV_STATUS_CMD_PTR_RDY)) { | |
55 | #if 0 | |
56 | if (list_empty(&active_commands[id])) { | |
57 | PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id); | |
58 | writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id)); | |
59 | } | |
60 | #endif | |
61 | PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status); | |
62 | list_add_tail(&cmd->list, &active_commands[id]); | |
63 | writel(cmd->cmdptr, DMOV_CMD_PTR(id)); | |
64 | } else { | |
65 | if (list_empty(&active_commands[id])) | |
66 | PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status); | |
67 | ||
68 | PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status); | |
69 | list_add_tail(&cmd->list, &ready_commands[id]); | |
70 | } | |
71 | spin_unlock_irqrestore(&msm_dmov_lock, irq_flags); | |
72 | } | |
73 | ||
74 | struct msm_dmov_exec_cmdptr_cmd { | |
75 | struct msm_dmov_cmd dmov_cmd; | |
76 | struct completion complete; | |
77 | unsigned id; | |
78 | unsigned int result; | |
79 | unsigned int flush[6]; | |
80 | }; | |
81 | ||
82 | static void dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd, unsigned int result) | |
83 | { | |
84 | struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd); | |
85 | cmd->result = result; | |
86 | if (result != 0x80000002) { | |
87 | cmd->flush[0] = readl(DMOV_FLUSH0(cmd->id)); | |
88 | cmd->flush[1] = readl(DMOV_FLUSH1(cmd->id)); | |
89 | cmd->flush[2] = readl(DMOV_FLUSH2(cmd->id)); | |
90 | cmd->flush[3] = readl(DMOV_FLUSH3(cmd->id)); | |
91 | cmd->flush[4] = readl(DMOV_FLUSH4(cmd->id)); | |
92 | cmd->flush[5] = readl(DMOV_FLUSH5(cmd->id)); | |
93 | } | |
94 | complete(&cmd->complete); | |
95 | } | |
96 | ||
97 | int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr) | |
98 | { | |
99 | struct msm_dmov_exec_cmdptr_cmd cmd; | |
100 | ||
101 | PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr); | |
102 | ||
103 | cmd.dmov_cmd.cmdptr = cmdptr; | |
104 | cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func; | |
105 | cmd.id = id; | |
106 | init_completion(&cmd.complete); | |
107 | ||
108 | msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd); | |
109 | wait_for_completion(&cmd.complete); | |
110 | ||
111 | if (cmd.result != 0x80000002) { | |
112 | PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result); | |
113 | PRINT_ERROR("dmov_exec_cmdptr(%d): flush: %x %x %x %x\n", | |
114 | id, cmd.flush[0], cmd.flush[1], cmd.flush[2], cmd.flush[3]); | |
115 | return -EIO; | |
116 | } | |
117 | PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | ||
122 | static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id) | |
123 | { | |
124 | unsigned int int_status, mask, id; | |
125 | unsigned long irq_flags; | |
126 | unsigned int ch_status; | |
127 | unsigned int ch_result; | |
128 | struct msm_dmov_cmd *cmd; | |
129 | ||
130 | spin_lock_irqsave(&msm_dmov_lock, irq_flags); | |
131 | ||
132 | int_status = readl(DMOV_ISR); /* read and clear interrupt */ | |
133 | PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status); | |
134 | ||
135 | while (int_status) { | |
136 | mask = int_status & -int_status; | |
137 | id = fls(mask) - 1; | |
138 | PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id); | |
139 | int_status &= ~mask; | |
140 | ch_status = readl(DMOV_STATUS(id)); | |
141 | if (!(ch_status & DMOV_STATUS_RSLT_VALID)) { | |
142 | PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status); | |
143 | continue; | |
144 | } | |
145 | do { | |
146 | ch_result = readl(DMOV_RSLT(id)); | |
147 | if (list_empty(&active_commands[id])) { | |
148 | PRINT_ERROR("msm_datamover_irq_handler id %d, got result " | |
149 | "with no active command, status %x, result %x\n", | |
150 | id, ch_status, ch_result); | |
151 | cmd = NULL; | |
152 | } else | |
153 | cmd = list_entry(active_commands[id].next, typeof(*cmd), list); | |
154 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result); | |
155 | if (ch_result & DMOV_RSLT_DONE) { | |
156 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", | |
157 | id, ch_status); | |
158 | PRINT_IO("msm_datamover_irq_handler id %d, got result " | |
159 | "for %p, result %x\n", id, cmd, ch_result); | |
160 | if (cmd) { | |
161 | list_del(&cmd->list); | |
162 | cmd->complete_func(cmd, ch_result); | |
163 | } | |
164 | } | |
165 | if (ch_result & DMOV_RSLT_FLUSH) { | |
166 | unsigned int flush0 = readl(DMOV_FLUSH0(id)); | |
167 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); | |
168 | PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, flush0); | |
169 | if (cmd) { | |
170 | list_del(&cmd->list); | |
171 | cmd->complete_func(cmd, ch_result); | |
172 | } | |
173 | } | |
174 | if (ch_result & DMOV_RSLT_ERROR) { | |
175 | unsigned int flush0 = readl(DMOV_FLUSH0(id)); | |
176 | PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); | |
177 | PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, flush0); | |
178 | if (cmd) { | |
179 | list_del(&cmd->list); | |
180 | cmd->complete_func(cmd, ch_result); | |
181 | } | |
182 | /* this does not seem to work, once we get an error */ | |
183 | /* the datamover will no longer accept commands */ | |
184 | writel(0, DMOV_FLUSH0(id)); | |
185 | } | |
186 | ch_status = readl(DMOV_STATUS(id)); | |
187 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); | |
188 | if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) { | |
189 | cmd = list_entry(ready_commands[id].next, typeof(*cmd), list); | |
190 | list_del(&cmd->list); | |
191 | list_add_tail(&cmd->list, &active_commands[id]); | |
192 | PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id); | |
193 | writel(cmd->cmdptr, DMOV_CMD_PTR(id)); | |
194 | } | |
195 | } while (ch_status & DMOV_STATUS_RSLT_VALID); | |
196 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); | |
197 | } | |
198 | spin_unlock_irqrestore(&msm_dmov_lock, irq_flags); | |
199 | return IRQ_HANDLED; | |
200 | } | |
201 | ||
202 | static int __init msm_init_datamover(void) | |
203 | { | |
204 | int i; | |
205 | for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) { | |
206 | INIT_LIST_HEAD(&ready_commands[i]); | |
207 | INIT_LIST_HEAD(&active_commands[i]); | |
208 | writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i)); | |
209 | } | |
210 | return request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL); | |
211 | } | |
212 | ||
213 | arch_initcall(msm_init_datamover); | |
214 |