Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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 | |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 16 | #include <linux/io.h> |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 17 | #include <linux/interrupt.h> |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 18 | #include <mach/dma.h> |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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); |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 29 | static unsigned int channel_active; |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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 | |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 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 | |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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]); |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 68 | if (!channel_active) |
| 69 | enable_irq(INT_ADM_AARM); |
| 70 | channel_active |= 1U << id; |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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; |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 87 | struct msm_dmov_errdata err; |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 88 | }; |
| 89 | |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 90 | static void |
| 91 | dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd, |
| 92 | unsigned int result, |
| 93 | struct msm_dmov_errdata *err) |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 94 | { |
| 95 | struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd); |
| 96 | cmd->result = result; |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 97 | if (result != 0x80000002 && err) |
| 98 | memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata)); |
| 99 | |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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", |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 120 | id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]); |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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); |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 168 | cmd->complete_func(cmd, ch_result, NULL); |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 169 | } |
| 170 | } |
| 171 | if (ch_result & DMOV_RSLT_FLUSH) { |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 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)); |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 180 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 181 | PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]); |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 182 | if (cmd) { |
| 183 | list_del(&cmd->list); |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 184 | cmd->complete_func(cmd, ch_result, &errdata); |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 185 | } |
| 186 | } |
| 187 | if (ch_result & DMOV_RSLT_ERROR) { |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 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 | |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 197 | PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 198 | PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]); |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 199 | if (cmd) { |
| 200 | list_del(&cmd->list); |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 201 | cmd->complete_func(cmd, ch_result, &errdata); |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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); |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 217 | if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id])) |
| 218 | channel_active &= ~(1U << id); |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 219 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
| 220 | } |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 221 | |
| 222 | if (!channel_active) |
| 223 | disable_irq(INT_ADM_AARM); |
| 224 | |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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; |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 232 | int ret; |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 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 | } |
Brian Swetland | 8a0f6f1 | 2008-09-10 14:58:25 -0700 | [diff] [blame] | 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; |
Arve Hjønnevåg | bfe645a | 2007-11-26 04:12:29 -0800 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | arch_initcall(msm_init_datamover); |
| 246 | |