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 25enum { 26 MSM_DMOV_PRINT_ERRORS = 1, 27 MSM_DMOV_PRINT_IO = 2, 28 MSM_DMOV_PRINT_FLOW = 4 29}; 30 31static DEFINE_SPINLOCK(msm_dmov_lock); 32static struct clk *msm_dmov_clk; 33static unsigned int channel_active; 34static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT]; 35static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT]; 36unsigned 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 50void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful) 51{ 52 writel((graceful << 31), DMOV_FLUSH0(id)); 53} 54 55void 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 93struct 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 101static void 102dmov_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 114int 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 140static 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 248static 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 270arch_initcall(msm_init_datamover); 271 272