Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Atmel MultiMedia Card Interface driver |
| 3 | * |
| 4 | * Copyright (C) 2004-2008 Atmel Corporation |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | #include <linux/blkdev.h> |
| 11 | #include <linux/clk.h> |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 12 | #include <linux/debugfs.h> |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 13 | #include <linux/device.h> |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 14 | #include <linux/dmaengine.h> |
| 15 | #include <linux/dma-mapping.h> |
Ben Nizette | fbfca4b | 2008-07-18 16:48:09 +1000 | [diff] [blame] | 16 | #include <linux/err.h> |
David Brownell | 3c26e17 | 2008-07-27 02:34:45 -0700 | [diff] [blame] | 17 | #include <linux/gpio.h> |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 18 | #include <linux/init.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/ioport.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/scatterlist.h> |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 24 | #include <linux/seq_file.h> |
| 25 | #include <linux/stat.h> |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 26 | |
| 27 | #include <linux/mmc/host.h> |
| 28 | |
| 29 | #include <asm/atmel-mci.h> |
| 30 | #include <asm/io.h> |
| 31 | #include <asm/unaligned.h> |
| 32 | |
Haavard Skinnemoen | 3663b73 | 2008-08-05 13:57:38 +0200 | [diff] [blame] | 33 | #include <mach/board.h> |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 34 | |
| 35 | #include "atmel-mci-regs.h" |
| 36 | |
| 37 | #define ATMCI_DATA_ERROR_FLAGS (MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE) |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 38 | #define ATMCI_DMA_THRESHOLD 16 |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 39 | |
| 40 | enum { |
| 41 | EVENT_CMD_COMPLETE = 0, |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 42 | EVENT_XFER_COMPLETE, |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 43 | EVENT_DATA_COMPLETE, |
| 44 | EVENT_DATA_ERROR, |
| 45 | }; |
| 46 | |
| 47 | enum atmel_mci_state { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 48 | STATE_IDLE = 0, |
| 49 | STATE_SENDING_CMD, |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 50 | STATE_SENDING_DATA, |
| 51 | STATE_DATA_BUSY, |
| 52 | STATE_SENDING_STOP, |
| 53 | STATE_DATA_ERROR, |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 54 | }; |
| 55 | |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 56 | struct atmel_mci_dma { |
| 57 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
| 58 | struct dma_client client; |
| 59 | struct dma_chan *chan; |
| 60 | struct dma_async_tx_descriptor *data_desc; |
| 61 | #endif |
| 62 | }; |
| 63 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 64 | /** |
| 65 | * struct atmel_mci - MMC controller state shared between all slots |
| 66 | * @lock: Spinlock protecting the queue and associated data. |
| 67 | * @regs: Pointer to MMIO registers. |
| 68 | * @sg: Scatterlist entry currently being processed by PIO code, if any. |
| 69 | * @pio_offset: Offset into the current scatterlist entry. |
| 70 | * @cur_slot: The slot which is currently using the controller. |
| 71 | * @mrq: The request currently being processed on @cur_slot, |
| 72 | * or NULL if the controller is idle. |
| 73 | * @cmd: The command currently being sent to the card, or NULL. |
| 74 | * @data: The data currently being transferred, or NULL if no data |
| 75 | * transfer is in progress. |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 76 | * @dma: DMA client state. |
| 77 | * @data_chan: DMA channel being used for the current data transfer. |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 78 | * @cmd_status: Snapshot of SR taken upon completion of the current |
| 79 | * command. Only valid when EVENT_CMD_COMPLETE is pending. |
| 80 | * @data_status: Snapshot of SR taken upon completion of the current |
| 81 | * data transfer. Only valid when EVENT_DATA_COMPLETE or |
| 82 | * EVENT_DATA_ERROR is pending. |
| 83 | * @stop_cmdr: Value to be loaded into CMDR when the stop command is |
| 84 | * to be sent. |
| 85 | * @tasklet: Tasklet running the request state machine. |
| 86 | * @pending_events: Bitmask of events flagged by the interrupt handler |
| 87 | * to be processed by the tasklet. |
| 88 | * @completed_events: Bitmask of events which the state machine has |
| 89 | * processed. |
| 90 | * @state: Tasklet state. |
| 91 | * @queue: List of slots waiting for access to the controller. |
| 92 | * @need_clock_update: Update the clock rate before the next request. |
| 93 | * @need_reset: Reset controller before next request. |
| 94 | * @mode_reg: Value of the MR register. |
| 95 | * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus |
| 96 | * rate and timeout calculations. |
| 97 | * @mapbase: Physical address of the MMIO registers. |
| 98 | * @mck: The peripheral bus clock hooked up to the MMC controller. |
| 99 | * @pdev: Platform device associated with the MMC controller. |
| 100 | * @slot: Slots sharing this MMC controller. |
| 101 | * |
| 102 | * Locking |
| 103 | * ======= |
| 104 | * |
| 105 | * @lock is a softirq-safe spinlock protecting @queue as well as |
| 106 | * @cur_slot, @mrq and @state. These must always be updated |
| 107 | * at the same time while holding @lock. |
| 108 | * |
| 109 | * @lock also protects mode_reg and need_clock_update since these are |
| 110 | * used to synchronize mode register updates with the queue |
| 111 | * processing. |
| 112 | * |
| 113 | * The @mrq field of struct atmel_mci_slot is also protected by @lock, |
| 114 | * and must always be written at the same time as the slot is added to |
| 115 | * @queue. |
| 116 | * |
| 117 | * @pending_events and @completed_events are accessed using atomic bit |
| 118 | * operations, so they don't need any locking. |
| 119 | * |
| 120 | * None of the fields touched by the interrupt handler need any |
| 121 | * locking. However, ordering is important: Before EVENT_DATA_ERROR or |
| 122 | * EVENT_DATA_COMPLETE is set in @pending_events, all data-related |
| 123 | * interrupts must be disabled and @data_status updated with a |
| 124 | * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the |
| 125 | * CMDRDY interupt must be disabled and @cmd_status updated with a |
| 126 | * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the |
| 127 | * bytes_xfered field of @data must be written. This is ensured by |
| 128 | * using barriers. |
| 129 | */ |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 130 | struct atmel_mci { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 131 | spinlock_t lock; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 132 | void __iomem *regs; |
| 133 | |
| 134 | struct scatterlist *sg; |
| 135 | unsigned int pio_offset; |
| 136 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 137 | struct atmel_mci_slot *cur_slot; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 138 | struct mmc_request *mrq; |
| 139 | struct mmc_command *cmd; |
| 140 | struct mmc_data *data; |
| 141 | |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 142 | struct atmel_mci_dma dma; |
| 143 | struct dma_chan *data_chan; |
| 144 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 145 | u32 cmd_status; |
| 146 | u32 data_status; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 147 | u32 stop_cmdr; |
| 148 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 149 | struct tasklet_struct tasklet; |
| 150 | unsigned long pending_events; |
| 151 | unsigned long completed_events; |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 152 | enum atmel_mci_state state; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 153 | struct list_head queue; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 154 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 155 | bool need_clock_update; |
| 156 | bool need_reset; |
| 157 | u32 mode_reg; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 158 | unsigned long bus_hz; |
| 159 | unsigned long mapbase; |
| 160 | struct clk *mck; |
| 161 | struct platform_device *pdev; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 162 | |
| 163 | struct atmel_mci_slot *slot[ATMEL_MCI_MAX_NR_SLOTS]; |
| 164 | }; |
| 165 | |
| 166 | /** |
| 167 | * struct atmel_mci_slot - MMC slot state |
| 168 | * @mmc: The mmc_host representing this slot. |
| 169 | * @host: The MMC controller this slot is using. |
| 170 | * @sdc_reg: Value of SDCR to be written before using this slot. |
| 171 | * @mrq: mmc_request currently being processed or waiting to be |
| 172 | * processed, or NULL when the slot is idle. |
| 173 | * @queue_node: List node for placing this node in the @queue list of |
| 174 | * &struct atmel_mci. |
| 175 | * @clock: Clock rate configured by set_ios(). Protected by host->lock. |
| 176 | * @flags: Random state bits associated with the slot. |
| 177 | * @detect_pin: GPIO pin used for card detection, or negative if not |
| 178 | * available. |
| 179 | * @wp_pin: GPIO pin used for card write protect sending, or negative |
| 180 | * if not available. |
| 181 | * @detect_timer: Timer used for debouncing @detect_pin interrupts. |
| 182 | */ |
| 183 | struct atmel_mci_slot { |
| 184 | struct mmc_host *mmc; |
| 185 | struct atmel_mci *host; |
| 186 | |
| 187 | u32 sdc_reg; |
| 188 | |
| 189 | struct mmc_request *mrq; |
| 190 | struct list_head queue_node; |
| 191 | |
| 192 | unsigned int clock; |
| 193 | unsigned long flags; |
| 194 | #define ATMCI_CARD_PRESENT 0 |
| 195 | #define ATMCI_CARD_NEED_INIT 1 |
| 196 | #define ATMCI_SHUTDOWN 2 |
| 197 | |
| 198 | int detect_pin; |
| 199 | int wp_pin; |
| 200 | |
| 201 | struct timer_list detect_timer; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 202 | }; |
| 203 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 204 | #define atmci_test_and_clear_pending(host, event) \ |
| 205 | test_and_clear_bit(event, &host->pending_events) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 206 | #define atmci_set_completed(host, event) \ |
| 207 | set_bit(event, &host->completed_events) |
| 208 | #define atmci_set_pending(host, event) \ |
| 209 | set_bit(event, &host->pending_events) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 210 | |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 211 | /* |
| 212 | * The debugfs stuff below is mostly optimized away when |
| 213 | * CONFIG_DEBUG_FS is not set. |
| 214 | */ |
| 215 | static int atmci_req_show(struct seq_file *s, void *v) |
| 216 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 217 | struct atmel_mci_slot *slot = s->private; |
| 218 | struct mmc_request *mrq; |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 219 | struct mmc_command *cmd; |
| 220 | struct mmc_command *stop; |
| 221 | struct mmc_data *data; |
| 222 | |
| 223 | /* Make sure we get a consistent snapshot */ |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 224 | spin_lock_bh(&slot->host->lock); |
| 225 | mrq = slot->mrq; |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 226 | |
| 227 | if (mrq) { |
| 228 | cmd = mrq->cmd; |
| 229 | data = mrq->data; |
| 230 | stop = mrq->stop; |
| 231 | |
| 232 | if (cmd) |
| 233 | seq_printf(s, |
| 234 | "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", |
| 235 | cmd->opcode, cmd->arg, cmd->flags, |
| 236 | cmd->resp[0], cmd->resp[1], cmd->resp[2], |
| 237 | cmd->resp[2], cmd->error); |
| 238 | if (data) |
| 239 | seq_printf(s, "DATA %u / %u * %u flg %x err %d\n", |
| 240 | data->bytes_xfered, data->blocks, |
| 241 | data->blksz, data->flags, data->error); |
| 242 | if (stop) |
| 243 | seq_printf(s, |
| 244 | "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", |
| 245 | stop->opcode, stop->arg, stop->flags, |
| 246 | stop->resp[0], stop->resp[1], stop->resp[2], |
| 247 | stop->resp[2], stop->error); |
| 248 | } |
| 249 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 250 | spin_unlock_bh(&slot->host->lock); |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 251 | |
| 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | static int atmci_req_open(struct inode *inode, struct file *file) |
| 256 | { |
| 257 | return single_open(file, atmci_req_show, inode->i_private); |
| 258 | } |
| 259 | |
| 260 | static const struct file_operations atmci_req_fops = { |
| 261 | .owner = THIS_MODULE, |
| 262 | .open = atmci_req_open, |
| 263 | .read = seq_read, |
| 264 | .llseek = seq_lseek, |
| 265 | .release = single_release, |
| 266 | }; |
| 267 | |
| 268 | static void atmci_show_status_reg(struct seq_file *s, |
| 269 | const char *regname, u32 value) |
| 270 | { |
| 271 | static const char *sr_bit[] = { |
| 272 | [0] = "CMDRDY", |
| 273 | [1] = "RXRDY", |
| 274 | [2] = "TXRDY", |
| 275 | [3] = "BLKE", |
| 276 | [4] = "DTIP", |
| 277 | [5] = "NOTBUSY", |
| 278 | [8] = "SDIOIRQA", |
| 279 | [9] = "SDIOIRQB", |
| 280 | [16] = "RINDE", |
| 281 | [17] = "RDIRE", |
| 282 | [18] = "RCRCE", |
| 283 | [19] = "RENDE", |
| 284 | [20] = "RTOE", |
| 285 | [21] = "DCRCE", |
| 286 | [22] = "DTOE", |
| 287 | [30] = "OVRE", |
| 288 | [31] = "UNRE", |
| 289 | }; |
| 290 | unsigned int i; |
| 291 | |
| 292 | seq_printf(s, "%s:\t0x%08x", regname, value); |
| 293 | for (i = 0; i < ARRAY_SIZE(sr_bit); i++) { |
| 294 | if (value & (1 << i)) { |
| 295 | if (sr_bit[i]) |
| 296 | seq_printf(s, " %s", sr_bit[i]); |
| 297 | else |
| 298 | seq_puts(s, " UNKNOWN"); |
| 299 | } |
| 300 | } |
| 301 | seq_putc(s, '\n'); |
| 302 | } |
| 303 | |
| 304 | static int atmci_regs_show(struct seq_file *s, void *v) |
| 305 | { |
| 306 | struct atmel_mci *host = s->private; |
| 307 | u32 *buf; |
| 308 | |
| 309 | buf = kmalloc(MCI_REGS_SIZE, GFP_KERNEL); |
| 310 | if (!buf) |
| 311 | return -ENOMEM; |
| 312 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 313 | /* |
| 314 | * Grab a more or less consistent snapshot. Note that we're |
| 315 | * not disabling interrupts, so IMR and SR may not be |
| 316 | * consistent. |
| 317 | */ |
| 318 | spin_lock_bh(&host->lock); |
Haavard Skinnemoen | 87e60f2 | 2008-09-19 21:09:27 +0200 | [diff] [blame] | 319 | clk_enable(host->mck); |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 320 | memcpy_fromio(buf, host->regs, MCI_REGS_SIZE); |
Haavard Skinnemoen | 87e60f2 | 2008-09-19 21:09:27 +0200 | [diff] [blame] | 321 | clk_disable(host->mck); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 322 | spin_unlock_bh(&host->lock); |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 323 | |
| 324 | seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n", |
| 325 | buf[MCI_MR / 4], |
| 326 | buf[MCI_MR / 4] & MCI_MR_RDPROOF ? " RDPROOF" : "", |
| 327 | buf[MCI_MR / 4] & MCI_MR_WRPROOF ? " WRPROOF" : "", |
| 328 | buf[MCI_MR / 4] & 0xff); |
| 329 | seq_printf(s, "DTOR:\t0x%08x\n", buf[MCI_DTOR / 4]); |
| 330 | seq_printf(s, "SDCR:\t0x%08x\n", buf[MCI_SDCR / 4]); |
| 331 | seq_printf(s, "ARGR:\t0x%08x\n", buf[MCI_ARGR / 4]); |
| 332 | seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n", |
| 333 | buf[MCI_BLKR / 4], |
| 334 | buf[MCI_BLKR / 4] & 0xffff, |
| 335 | (buf[MCI_BLKR / 4] >> 16) & 0xffff); |
| 336 | |
| 337 | /* Don't read RSPR and RDR; it will consume the data there */ |
| 338 | |
| 339 | atmci_show_status_reg(s, "SR", buf[MCI_SR / 4]); |
| 340 | atmci_show_status_reg(s, "IMR", buf[MCI_IMR / 4]); |
| 341 | |
Haavard Skinnemoen | b17339a | 2008-09-19 21:09:28 +0200 | [diff] [blame] | 342 | kfree(buf); |
| 343 | |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | static int atmci_regs_open(struct inode *inode, struct file *file) |
| 348 | { |
| 349 | return single_open(file, atmci_regs_show, inode->i_private); |
| 350 | } |
| 351 | |
| 352 | static const struct file_operations atmci_regs_fops = { |
| 353 | .owner = THIS_MODULE, |
| 354 | .open = atmci_regs_open, |
| 355 | .read = seq_read, |
| 356 | .llseek = seq_lseek, |
| 357 | .release = single_release, |
| 358 | }; |
| 359 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 360 | static void atmci_init_debugfs(struct atmel_mci_slot *slot) |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 361 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 362 | struct mmc_host *mmc = slot->mmc; |
| 363 | struct atmel_mci *host = slot->host; |
| 364 | struct dentry *root; |
| 365 | struct dentry *node; |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 366 | |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 367 | root = mmc->debugfs_root; |
| 368 | if (!root) |
| 369 | return; |
| 370 | |
| 371 | node = debugfs_create_file("regs", S_IRUSR, root, host, |
| 372 | &atmci_regs_fops); |
| 373 | if (IS_ERR(node)) |
| 374 | return; |
| 375 | if (!node) |
| 376 | goto err; |
| 377 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 378 | node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops); |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 379 | if (!node) |
| 380 | goto err; |
| 381 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 382 | node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state); |
| 383 | if (!node) |
| 384 | goto err; |
| 385 | |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 386 | node = debugfs_create_x32("pending_events", S_IRUSR, root, |
| 387 | (u32 *)&host->pending_events); |
| 388 | if (!node) |
| 389 | goto err; |
| 390 | |
| 391 | node = debugfs_create_x32("completed_events", S_IRUSR, root, |
| 392 | (u32 *)&host->completed_events); |
| 393 | if (!node) |
| 394 | goto err; |
| 395 | |
| 396 | return; |
| 397 | |
| 398 | err: |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 399 | dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n"); |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 400 | } |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 401 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 402 | static inline unsigned int ns_to_clocks(struct atmel_mci *host, |
| 403 | unsigned int ns) |
| 404 | { |
| 405 | return (ns * (host->bus_hz / 1000000) + 999) / 1000; |
| 406 | } |
| 407 | |
| 408 | static void atmci_set_timeout(struct atmel_mci *host, |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 409 | struct atmel_mci_slot *slot, struct mmc_data *data) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 410 | { |
| 411 | static unsigned dtomul_to_shift[] = { |
| 412 | 0, 4, 7, 8, 10, 12, 16, 20 |
| 413 | }; |
| 414 | unsigned timeout; |
| 415 | unsigned dtocyc; |
| 416 | unsigned dtomul; |
| 417 | |
| 418 | timeout = ns_to_clocks(host, data->timeout_ns) + data->timeout_clks; |
| 419 | |
| 420 | for (dtomul = 0; dtomul < 8; dtomul++) { |
| 421 | unsigned shift = dtomul_to_shift[dtomul]; |
| 422 | dtocyc = (timeout + (1 << shift) - 1) >> shift; |
| 423 | if (dtocyc < 15) |
| 424 | break; |
| 425 | } |
| 426 | |
| 427 | if (dtomul >= 8) { |
| 428 | dtomul = 7; |
| 429 | dtocyc = 15; |
| 430 | } |
| 431 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 432 | dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n", |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 433 | dtocyc << dtomul_to_shift[dtomul]); |
| 434 | mci_writel(host, DTOR, (MCI_DTOMUL(dtomul) | MCI_DTOCYC(dtocyc))); |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * Return mask with command flags to be enabled for this command. |
| 439 | */ |
| 440 | static u32 atmci_prepare_command(struct mmc_host *mmc, |
| 441 | struct mmc_command *cmd) |
| 442 | { |
| 443 | struct mmc_data *data; |
| 444 | u32 cmdr; |
| 445 | |
| 446 | cmd->error = -EINPROGRESS; |
| 447 | |
| 448 | cmdr = MCI_CMDR_CMDNB(cmd->opcode); |
| 449 | |
| 450 | if (cmd->flags & MMC_RSP_PRESENT) { |
| 451 | if (cmd->flags & MMC_RSP_136) |
| 452 | cmdr |= MCI_CMDR_RSPTYP_136BIT; |
| 453 | else |
| 454 | cmdr |= MCI_CMDR_RSPTYP_48BIT; |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * This should really be MAXLAT_5 for CMD2 and ACMD41, but |
| 459 | * it's too difficult to determine whether this is an ACMD or |
| 460 | * not. Better make it 64. |
| 461 | */ |
| 462 | cmdr |= MCI_CMDR_MAXLAT_64CYC; |
| 463 | |
| 464 | if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN) |
| 465 | cmdr |= MCI_CMDR_OPDCMD; |
| 466 | |
| 467 | data = cmd->data; |
| 468 | if (data) { |
| 469 | cmdr |= MCI_CMDR_START_XFER; |
| 470 | if (data->flags & MMC_DATA_STREAM) |
| 471 | cmdr |= MCI_CMDR_STREAM; |
| 472 | else if (data->blocks > 1) |
| 473 | cmdr |= MCI_CMDR_MULTI_BLOCK; |
| 474 | else |
| 475 | cmdr |= MCI_CMDR_BLOCK; |
| 476 | |
| 477 | if (data->flags & MMC_DATA_READ) |
| 478 | cmdr |= MCI_CMDR_TRDIR_READ; |
| 479 | } |
| 480 | |
| 481 | return cmdr; |
| 482 | } |
| 483 | |
| 484 | static void atmci_start_command(struct atmel_mci *host, |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 485 | struct mmc_command *cmd, u32 cmd_flags) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 486 | { |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 487 | WARN_ON(host->cmd); |
| 488 | host->cmd = cmd; |
| 489 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 490 | dev_vdbg(&host->pdev->dev, |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 491 | "start command: ARGR=0x%08x CMDR=0x%08x\n", |
| 492 | cmd->arg, cmd_flags); |
| 493 | |
| 494 | mci_writel(host, ARGR, cmd->arg); |
| 495 | mci_writel(host, CMDR, cmd_flags); |
| 496 | } |
| 497 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 498 | static void send_stop_cmd(struct atmel_mci *host, struct mmc_data *data) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 499 | { |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 500 | atmci_start_command(host, data->stop, host->stop_cmdr); |
| 501 | mci_writel(host, IER, MCI_CMDRDY); |
| 502 | } |
| 503 | |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 504 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
| 505 | static void atmci_dma_cleanup(struct atmel_mci *host) |
| 506 | { |
| 507 | struct mmc_data *data = host->data; |
| 508 | |
| 509 | dma_unmap_sg(&host->pdev->dev, data->sg, data->sg_len, |
| 510 | ((data->flags & MMC_DATA_WRITE) |
| 511 | ? DMA_TO_DEVICE : DMA_FROM_DEVICE)); |
| 512 | } |
| 513 | |
| 514 | static void atmci_stop_dma(struct atmel_mci *host) |
| 515 | { |
| 516 | struct dma_chan *chan = host->data_chan; |
| 517 | |
| 518 | if (chan) { |
| 519 | chan->device->device_terminate_all(chan); |
| 520 | atmci_dma_cleanup(host); |
| 521 | } else { |
| 522 | /* Data transfer was stopped by the interrupt handler */ |
| 523 | atmci_set_pending(host, EVENT_XFER_COMPLETE); |
| 524 | mci_writel(host, IER, MCI_NOTBUSY); |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /* This function is called by the DMA driver from tasklet context. */ |
| 529 | static void atmci_dma_complete(void *arg) |
| 530 | { |
| 531 | struct atmel_mci *host = arg; |
| 532 | struct mmc_data *data = host->data; |
| 533 | |
| 534 | dev_vdbg(&host->pdev->dev, "DMA complete\n"); |
| 535 | |
| 536 | atmci_dma_cleanup(host); |
| 537 | |
| 538 | /* |
| 539 | * If the card was removed, data will be NULL. No point trying |
| 540 | * to send the stop command or waiting for NBUSY in this case. |
| 541 | */ |
| 542 | if (data) { |
| 543 | atmci_set_pending(host, EVENT_XFER_COMPLETE); |
| 544 | tasklet_schedule(&host->tasklet); |
| 545 | |
| 546 | /* |
| 547 | * Regardless of what the documentation says, we have |
| 548 | * to wait for NOTBUSY even after block read |
| 549 | * operations. |
| 550 | * |
| 551 | * When the DMA transfer is complete, the controller |
| 552 | * may still be reading the CRC from the card, i.e. |
| 553 | * the data transfer is still in progress and we |
| 554 | * haven't seen all the potential error bits yet. |
| 555 | * |
| 556 | * The interrupt handler will schedule a different |
| 557 | * tasklet to finish things up when the data transfer |
| 558 | * is completely done. |
| 559 | * |
| 560 | * We may not complete the mmc request here anyway |
| 561 | * because the mmc layer may call back and cause us to |
| 562 | * violate the "don't submit new operations from the |
| 563 | * completion callback" rule of the dma engine |
| 564 | * framework. |
| 565 | */ |
| 566 | mci_writel(host, IER, MCI_NOTBUSY); |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | static int |
| 571 | atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data) |
| 572 | { |
| 573 | struct dma_chan *chan; |
| 574 | struct dma_async_tx_descriptor *desc; |
| 575 | struct scatterlist *sg; |
| 576 | unsigned int i; |
| 577 | enum dma_data_direction direction; |
| 578 | |
| 579 | /* |
| 580 | * We don't do DMA on "complex" transfers, i.e. with |
| 581 | * non-word-aligned buffers or lengths. Also, we don't bother |
| 582 | * with all the DMA setup overhead for short transfers. |
| 583 | */ |
| 584 | if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD) |
| 585 | return -EINVAL; |
| 586 | if (data->blksz & 3) |
| 587 | return -EINVAL; |
| 588 | |
| 589 | for_each_sg(data->sg, sg, data->sg_len, i) { |
| 590 | if (sg->offset & 3 || sg->length & 3) |
| 591 | return -EINVAL; |
| 592 | } |
| 593 | |
| 594 | /* If we don't have a channel, we can't do DMA */ |
| 595 | chan = host->dma.chan; |
Dan Williams | 6f49a57 | 2009-01-06 11:38:14 -0700 | [diff] [blame] | 596 | if (chan) |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 597 | host->data_chan = chan; |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 598 | |
| 599 | if (!chan) |
| 600 | return -ENODEV; |
| 601 | |
| 602 | if (data->flags & MMC_DATA_READ) |
| 603 | direction = DMA_FROM_DEVICE; |
| 604 | else |
| 605 | direction = DMA_TO_DEVICE; |
| 606 | |
| 607 | desc = chan->device->device_prep_slave_sg(chan, |
| 608 | data->sg, data->sg_len, direction, |
| 609 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| 610 | if (!desc) |
| 611 | return -ENOMEM; |
| 612 | |
| 613 | host->dma.data_desc = desc; |
| 614 | desc->callback = atmci_dma_complete; |
| 615 | desc->callback_param = host; |
| 616 | desc->tx_submit(desc); |
| 617 | |
| 618 | /* Go! */ |
| 619 | chan->device->device_issue_pending(chan); |
| 620 | |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | #else /* CONFIG_MMC_ATMELMCI_DMA */ |
| 625 | |
| 626 | static int atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data) |
| 627 | { |
| 628 | return -ENOSYS; |
| 629 | } |
| 630 | |
| 631 | static void atmci_stop_dma(struct atmel_mci *host) |
| 632 | { |
| 633 | /* Data transfer was stopped by the interrupt handler */ |
| 634 | atmci_set_pending(host, EVENT_XFER_COMPLETE); |
| 635 | mci_writel(host, IER, MCI_NOTBUSY); |
| 636 | } |
| 637 | |
| 638 | #endif /* CONFIG_MMC_ATMELMCI_DMA */ |
| 639 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 640 | /* |
| 641 | * Returns a mask of interrupt flags to be enabled after the whole |
| 642 | * request has been prepared. |
| 643 | */ |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 644 | static u32 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 645 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 646 | u32 iflags; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 647 | |
| 648 | data->error = -EINPROGRESS; |
| 649 | |
| 650 | WARN_ON(host->data); |
| 651 | host->sg = NULL; |
| 652 | host->data = data; |
| 653 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 654 | iflags = ATMCI_DATA_ERROR_FLAGS; |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 655 | if (atmci_submit_data_dma(host, data)) { |
| 656 | host->data_chan = NULL; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 657 | |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 658 | /* |
| 659 | * Errata: MMC data write operation with less than 12 |
| 660 | * bytes is impossible. |
| 661 | * |
| 662 | * Errata: MCI Transmit Data Register (TDR) FIFO |
| 663 | * corruption when length is not multiple of 4. |
| 664 | */ |
| 665 | if (data->blocks * data->blksz < 12 |
| 666 | || (data->blocks * data->blksz) & 3) |
| 667 | host->need_reset = true; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 668 | |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 669 | host->sg = data->sg; |
| 670 | host->pio_offset = 0; |
| 671 | if (data->flags & MMC_DATA_READ) |
| 672 | iflags |= MCI_RXRDY; |
| 673 | else |
| 674 | iflags |= MCI_TXRDY; |
| 675 | } |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 676 | |
| 677 | return iflags; |
| 678 | } |
| 679 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 680 | static void atmci_start_request(struct atmel_mci *host, |
| 681 | struct atmel_mci_slot *slot) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 682 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 683 | struct mmc_request *mrq; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 684 | struct mmc_command *cmd; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 685 | struct mmc_data *data; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 686 | u32 iflags; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 687 | u32 cmdflags; |
| 688 | |
| 689 | mrq = slot->mrq; |
| 690 | host->cur_slot = slot; |
| 691 | host->mrq = mrq; |
| 692 | |
| 693 | host->pending_events = 0; |
| 694 | host->completed_events = 0; |
Haavard Skinnemoen | ca55f46 | 2008-10-05 15:16:59 +0200 | [diff] [blame] | 695 | host->data_status = 0; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 696 | |
| 697 | if (host->need_reset) { |
| 698 | mci_writel(host, CR, MCI_CR_SWRST); |
| 699 | mci_writel(host, CR, MCI_CR_MCIEN); |
| 700 | mci_writel(host, MR, host->mode_reg); |
| 701 | host->need_reset = false; |
| 702 | } |
| 703 | mci_writel(host, SDCR, slot->sdc_reg); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 704 | |
| 705 | iflags = mci_readl(host, IMR); |
| 706 | if (iflags) |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 707 | dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n", |
| 708 | iflags); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 709 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 710 | if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) { |
| 711 | /* Send init sequence (74 clock cycles) */ |
| 712 | mci_writel(host, CMDR, MCI_CMDR_SPCMD_INIT); |
| 713 | while (!(mci_readl(host, SR) & MCI_CMDRDY)) |
| 714 | cpu_relax(); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 715 | } |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 716 | data = mrq->data; |
| 717 | if (data) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 718 | atmci_set_timeout(host, slot, data); |
Haavard Skinnemoen | a252e3e | 2008-10-03 14:46:17 +0200 | [diff] [blame] | 719 | |
| 720 | /* Must set block count/size before sending command */ |
| 721 | mci_writel(host, BLKR, MCI_BCNT(data->blocks) |
| 722 | | MCI_BLKLEN(data->blksz)); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 723 | dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n", |
| 724 | MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz)); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | iflags = MCI_CMDRDY; |
| 728 | cmd = mrq->cmd; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 729 | cmdflags = atmci_prepare_command(slot->mmc, cmd); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 730 | atmci_start_command(host, cmd, cmdflags); |
| 731 | |
| 732 | if (data) |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 733 | iflags |= atmci_submit_data(host, data); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 734 | |
| 735 | if (mrq->stop) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 736 | host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 737 | host->stop_cmdr |= MCI_CMDR_STOP_XFER; |
| 738 | if (!(data->flags & MMC_DATA_WRITE)) |
| 739 | host->stop_cmdr |= MCI_CMDR_TRDIR_READ; |
| 740 | if (data->flags & MMC_DATA_STREAM) |
| 741 | host->stop_cmdr |= MCI_CMDR_STREAM; |
| 742 | else |
| 743 | host->stop_cmdr |= MCI_CMDR_MULTI_BLOCK; |
| 744 | } |
| 745 | |
| 746 | /* |
| 747 | * We could have enabled interrupts earlier, but I suspect |
| 748 | * that would open up a nice can of interesting race |
| 749 | * conditions (e.g. command and data complete, but stop not |
| 750 | * prepared yet.) |
| 751 | */ |
| 752 | mci_writel(host, IER, iflags); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 753 | } |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 754 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 755 | static void atmci_queue_request(struct atmel_mci *host, |
| 756 | struct atmel_mci_slot *slot, struct mmc_request *mrq) |
| 757 | { |
| 758 | dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n", |
| 759 | host->state); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 760 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 761 | spin_lock_bh(&host->lock); |
| 762 | slot->mrq = mrq; |
| 763 | if (host->state == STATE_IDLE) { |
| 764 | host->state = STATE_SENDING_CMD; |
| 765 | atmci_start_request(host, slot); |
| 766 | } else { |
| 767 | list_add_tail(&slot->queue_node, &host->queue); |
| 768 | } |
| 769 | spin_unlock_bh(&host->lock); |
| 770 | } |
| 771 | |
| 772 | static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq) |
| 773 | { |
| 774 | struct atmel_mci_slot *slot = mmc_priv(mmc); |
| 775 | struct atmel_mci *host = slot->host; |
| 776 | struct mmc_data *data; |
| 777 | |
| 778 | WARN_ON(slot->mrq); |
| 779 | |
| 780 | /* |
| 781 | * We may "know" the card is gone even though there's still an |
| 782 | * electrical connection. If so, we really need to communicate |
| 783 | * this to the MMC core since there won't be any more |
| 784 | * interrupts as the card is completely removed. Otherwise, |
| 785 | * the MMC core might believe the card is still there even |
| 786 | * though the card was just removed very slowly. |
| 787 | */ |
| 788 | if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) { |
| 789 | mrq->cmd->error = -ENOMEDIUM; |
| 790 | mmc_request_done(mmc, mrq); |
| 791 | return; |
| 792 | } |
| 793 | |
| 794 | /* We don't support multiple blocks of weird lengths. */ |
| 795 | data = mrq->data; |
| 796 | if (data && data->blocks > 1 && data->blksz & 3) { |
| 797 | mrq->cmd->error = -EINVAL; |
| 798 | mmc_request_done(mmc, mrq); |
| 799 | } |
| 800 | |
| 801 | atmci_queue_request(host, slot, mrq); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 802 | } |
| 803 | |
| 804 | static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) |
| 805 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 806 | struct atmel_mci_slot *slot = mmc_priv(mmc); |
| 807 | struct atmel_mci *host = slot->host; |
| 808 | unsigned int i; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 809 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 810 | slot->sdc_reg &= ~MCI_SDCBUS_MASK; |
Haavard Skinnemoen | 945533b | 2008-10-03 17:48:16 +0200 | [diff] [blame] | 811 | switch (ios->bus_width) { |
| 812 | case MMC_BUS_WIDTH_1: |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 813 | slot->sdc_reg |= MCI_SDCBUS_1BIT; |
Haavard Skinnemoen | 945533b | 2008-10-03 17:48:16 +0200 | [diff] [blame] | 814 | break; |
| 815 | case MMC_BUS_WIDTH_4: |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 816 | slot->sdc_reg = MCI_SDCBUS_4BIT; |
Haavard Skinnemoen | 945533b | 2008-10-03 17:48:16 +0200 | [diff] [blame] | 817 | break; |
| 818 | } |
| 819 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 820 | if (ios->clock) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 821 | unsigned int clock_min = ~0U; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 822 | u32 clkdiv; |
| 823 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 824 | spin_lock_bh(&host->lock); |
| 825 | if (!host->mode_reg) { |
Haavard Skinnemoen | 945533b | 2008-10-03 17:48:16 +0200 | [diff] [blame] | 826 | clk_enable(host->mck); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 827 | mci_writel(host, CR, MCI_CR_SWRST); |
| 828 | mci_writel(host, CR, MCI_CR_MCIEN); |
| 829 | } |
Haavard Skinnemoen | 945533b | 2008-10-03 17:48:16 +0200 | [diff] [blame] | 830 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 831 | /* |
| 832 | * Use mirror of ios->clock to prevent race with mmc |
| 833 | * core ios update when finding the minimum. |
| 834 | */ |
| 835 | slot->clock = ios->clock; |
| 836 | for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { |
| 837 | if (host->slot[i] && host->slot[i]->clock |
| 838 | && host->slot[i]->clock < clock_min) |
| 839 | clock_min = host->slot[i]->clock; |
| 840 | } |
| 841 | |
| 842 | /* Calculate clock divider */ |
| 843 | clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 844 | if (clkdiv > 255) { |
| 845 | dev_warn(&mmc->class_dev, |
| 846 | "clock %u too slow; using %lu\n", |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 847 | clock_min, host->bus_hz / (2 * 256)); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 848 | clkdiv = 255; |
| 849 | } |
| 850 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 851 | /* |
| 852 | * WRPROOF and RDPROOF prevent overruns/underruns by |
| 853 | * stopping the clock when the FIFO is full/empty. |
| 854 | * This state is not expected to last for long. |
| 855 | */ |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 856 | host->mode_reg = MCI_MR_CLKDIV(clkdiv) | MCI_MR_WRPROOF |
| 857 | | MCI_MR_RDPROOF; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 858 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 859 | if (list_empty(&host->queue)) |
| 860 | mci_writel(host, MR, host->mode_reg); |
| 861 | else |
| 862 | host->need_clock_update = true; |
| 863 | |
| 864 | spin_unlock_bh(&host->lock); |
Haavard Skinnemoen | 945533b | 2008-10-03 17:48:16 +0200 | [diff] [blame] | 865 | } else { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 866 | bool any_slot_active = false; |
| 867 | |
| 868 | spin_lock_bh(&host->lock); |
| 869 | slot->clock = 0; |
| 870 | for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { |
| 871 | if (host->slot[i] && host->slot[i]->clock) { |
| 872 | any_slot_active = true; |
| 873 | break; |
| 874 | } |
Haavard Skinnemoen | 945533b | 2008-10-03 17:48:16 +0200 | [diff] [blame] | 875 | } |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 876 | if (!any_slot_active) { |
| 877 | mci_writel(host, CR, MCI_CR_MCIDIS); |
| 878 | if (host->mode_reg) { |
| 879 | mci_readl(host, MR); |
| 880 | clk_disable(host->mck); |
| 881 | } |
| 882 | host->mode_reg = 0; |
| 883 | } |
| 884 | spin_unlock_bh(&host->lock); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 885 | } |
| 886 | |
| 887 | switch (ios->power_mode) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 888 | case MMC_POWER_UP: |
| 889 | set_bit(ATMCI_CARD_NEED_INIT, &slot->flags); |
| 890 | break; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 891 | default: |
| 892 | /* |
| 893 | * TODO: None of the currently available AVR32-based |
| 894 | * boards allow MMC power to be turned off. Implement |
| 895 | * power control when this can be tested properly. |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 896 | * |
| 897 | * We also need to hook this into the clock management |
| 898 | * somehow so that newly inserted cards aren't |
| 899 | * subjected to a fast clock before we have a chance |
| 900 | * to figure out what the maximum rate is. Currently, |
| 901 | * there's no way to avoid this, and there never will |
| 902 | * be for boards that don't support power control. |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 903 | */ |
| 904 | break; |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | static int atmci_get_ro(struct mmc_host *mmc) |
| 909 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 910 | int read_only = -ENOSYS; |
| 911 | struct atmel_mci_slot *slot = mmc_priv(mmc); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 912 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 913 | if (gpio_is_valid(slot->wp_pin)) { |
| 914 | read_only = gpio_get_value(slot->wp_pin); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 915 | dev_dbg(&mmc->class_dev, "card is %s\n", |
| 916 | read_only ? "read-only" : "read-write"); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 917 | } |
| 918 | |
| 919 | return read_only; |
| 920 | } |
| 921 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 922 | static int atmci_get_cd(struct mmc_host *mmc) |
| 923 | { |
| 924 | int present = -ENOSYS; |
| 925 | struct atmel_mci_slot *slot = mmc_priv(mmc); |
| 926 | |
| 927 | if (gpio_is_valid(slot->detect_pin)) { |
| 928 | present = !gpio_get_value(slot->detect_pin); |
| 929 | dev_dbg(&mmc->class_dev, "card is %spresent\n", |
| 930 | present ? "" : "not "); |
| 931 | } |
| 932 | |
| 933 | return present; |
| 934 | } |
| 935 | |
| 936 | static const struct mmc_host_ops atmci_ops = { |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 937 | .request = atmci_request, |
| 938 | .set_ios = atmci_set_ios, |
| 939 | .get_ro = atmci_get_ro, |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 940 | .get_cd = atmci_get_cd, |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 941 | }; |
| 942 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 943 | /* Called with host->lock held */ |
| 944 | static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq) |
| 945 | __releases(&host->lock) |
| 946 | __acquires(&host->lock) |
| 947 | { |
| 948 | struct atmel_mci_slot *slot = NULL; |
| 949 | struct mmc_host *prev_mmc = host->cur_slot->mmc; |
| 950 | |
| 951 | WARN_ON(host->cmd || host->data); |
| 952 | |
| 953 | /* |
| 954 | * Update the MMC clock rate if necessary. This may be |
| 955 | * necessary if set_ios() is called when a different slot is |
| 956 | * busy transfering data. |
| 957 | */ |
| 958 | if (host->need_clock_update) |
| 959 | mci_writel(host, MR, host->mode_reg); |
| 960 | |
| 961 | host->cur_slot->mrq = NULL; |
| 962 | host->mrq = NULL; |
| 963 | if (!list_empty(&host->queue)) { |
| 964 | slot = list_entry(host->queue.next, |
| 965 | struct atmel_mci_slot, queue_node); |
| 966 | list_del(&slot->queue_node); |
| 967 | dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n", |
| 968 | mmc_hostname(slot->mmc)); |
| 969 | host->state = STATE_SENDING_CMD; |
| 970 | atmci_start_request(host, slot); |
| 971 | } else { |
| 972 | dev_vdbg(&host->pdev->dev, "list empty\n"); |
| 973 | host->state = STATE_IDLE; |
| 974 | } |
| 975 | |
| 976 | spin_unlock(&host->lock); |
| 977 | mmc_request_done(prev_mmc, mrq); |
| 978 | spin_lock(&host->lock); |
| 979 | } |
| 980 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 981 | static void atmci_command_complete(struct atmel_mci *host, |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 982 | struct mmc_command *cmd) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 983 | { |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 984 | u32 status = host->cmd_status; |
| 985 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 986 | /* Read the response from the card (up to 16 bytes) */ |
| 987 | cmd->resp[0] = mci_readl(host, RSPR); |
| 988 | cmd->resp[1] = mci_readl(host, RSPR); |
| 989 | cmd->resp[2] = mci_readl(host, RSPR); |
| 990 | cmd->resp[3] = mci_readl(host, RSPR); |
| 991 | |
| 992 | if (status & MCI_RTOE) |
| 993 | cmd->error = -ETIMEDOUT; |
| 994 | else if ((cmd->flags & MMC_RSP_CRC) && (status & MCI_RCRCE)) |
| 995 | cmd->error = -EILSEQ; |
| 996 | else if (status & (MCI_RINDE | MCI_RDIRE | MCI_RENDE)) |
| 997 | cmd->error = -EIO; |
| 998 | else |
| 999 | cmd->error = 0; |
| 1000 | |
| 1001 | if (cmd->error) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1002 | dev_dbg(&host->pdev->dev, |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1003 | "command error: status=0x%08x\n", status); |
| 1004 | |
| 1005 | if (cmd->data) { |
| 1006 | host->data = NULL; |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1007 | atmci_stop_dma(host); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1008 | mci_writel(host, IDR, MCI_NOTBUSY |
| 1009 | | MCI_TXRDY | MCI_RXRDY |
| 1010 | | ATMCI_DATA_ERROR_FLAGS); |
| 1011 | } |
| 1012 | } |
| 1013 | } |
| 1014 | |
| 1015 | static void atmci_detect_change(unsigned long data) |
| 1016 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1017 | struct atmel_mci_slot *slot = (struct atmel_mci_slot *)data; |
| 1018 | bool present; |
| 1019 | bool present_old; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1020 | |
| 1021 | /* |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1022 | * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before |
| 1023 | * freeing the interrupt. We must not re-enable the interrupt |
| 1024 | * if it has been freed, and if we're shutting down, it |
| 1025 | * doesn't really matter whether the card is present or not. |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1026 | */ |
| 1027 | smp_rmb(); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1028 | if (test_bit(ATMCI_SHUTDOWN, &slot->flags)) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1029 | return; |
| 1030 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1031 | enable_irq(gpio_to_irq(slot->detect_pin)); |
| 1032 | present = !gpio_get_value(slot->detect_pin); |
| 1033 | present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1034 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1035 | dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n", |
| 1036 | present, present_old); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1037 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1038 | if (present != present_old) { |
| 1039 | struct atmel_mci *host = slot->host; |
| 1040 | struct mmc_request *mrq; |
| 1041 | |
| 1042 | dev_dbg(&slot->mmc->class_dev, "card %s\n", |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1043 | present ? "inserted" : "removed"); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1044 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1045 | spin_lock(&host->lock); |
| 1046 | |
| 1047 | if (!present) |
| 1048 | clear_bit(ATMCI_CARD_PRESENT, &slot->flags); |
| 1049 | else |
| 1050 | set_bit(ATMCI_CARD_PRESENT, &slot->flags); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1051 | |
| 1052 | /* Clean up queue if present */ |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1053 | mrq = slot->mrq; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1054 | if (mrq) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1055 | if (mrq == host->mrq) { |
| 1056 | /* |
| 1057 | * Reset controller to terminate any ongoing |
| 1058 | * commands or data transfers. |
| 1059 | */ |
| 1060 | mci_writel(host, CR, MCI_CR_SWRST); |
| 1061 | mci_writel(host, CR, MCI_CR_MCIEN); |
| 1062 | mci_writel(host, MR, host->mode_reg); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1063 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1064 | host->data = NULL; |
| 1065 | host->cmd = NULL; |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1066 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1067 | switch (host->state) { |
| 1068 | case STATE_IDLE: |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1069 | break; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1070 | case STATE_SENDING_CMD: |
| 1071 | mrq->cmd->error = -ENOMEDIUM; |
| 1072 | if (!mrq->data) |
| 1073 | break; |
| 1074 | /* fall through */ |
| 1075 | case STATE_SENDING_DATA: |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1076 | mrq->data->error = -ENOMEDIUM; |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1077 | atmci_stop_dma(host); |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1078 | break; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1079 | case STATE_DATA_BUSY: |
| 1080 | case STATE_DATA_ERROR: |
| 1081 | if (mrq->data->error == -EINPROGRESS) |
| 1082 | mrq->data->error = -ENOMEDIUM; |
| 1083 | if (!mrq->stop) |
| 1084 | break; |
| 1085 | /* fall through */ |
| 1086 | case STATE_SENDING_STOP: |
| 1087 | mrq->stop->error = -ENOMEDIUM; |
| 1088 | break; |
| 1089 | } |
| 1090 | |
| 1091 | atmci_request_end(host, mrq); |
| 1092 | } else { |
| 1093 | list_del(&slot->queue_node); |
| 1094 | mrq->cmd->error = -ENOMEDIUM; |
| 1095 | if (mrq->data) |
| 1096 | mrq->data->error = -ENOMEDIUM; |
| 1097 | if (mrq->stop) |
| 1098 | mrq->stop->error = -ENOMEDIUM; |
| 1099 | |
| 1100 | spin_unlock(&host->lock); |
| 1101 | mmc_request_done(slot->mmc, mrq); |
| 1102 | spin_lock(&host->lock); |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1103 | } |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1104 | } |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1105 | spin_unlock(&host->lock); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1106 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1107 | mmc_detect_change(slot->mmc, 0); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | static void atmci_tasklet_func(unsigned long priv) |
| 1112 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1113 | struct atmel_mci *host = (struct atmel_mci *)priv; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1114 | struct mmc_request *mrq = host->mrq; |
| 1115 | struct mmc_data *data = host->data; |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1116 | struct mmc_command *cmd = host->cmd; |
| 1117 | enum atmel_mci_state state = host->state; |
| 1118 | enum atmel_mci_state prev_state; |
| 1119 | u32 status; |
| 1120 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1121 | spin_lock(&host->lock); |
| 1122 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1123 | state = host->state; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1124 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1125 | dev_vdbg(&host->pdev->dev, |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1126 | "tasklet: state %u pending/completed/mask %lx/%lx/%x\n", |
| 1127 | state, host->pending_events, host->completed_events, |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1128 | mci_readl(host, IMR)); |
| 1129 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1130 | do { |
| 1131 | prev_state = state; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1132 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1133 | switch (state) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1134 | case STATE_IDLE: |
| 1135 | break; |
| 1136 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1137 | case STATE_SENDING_CMD: |
| 1138 | if (!atmci_test_and_clear_pending(host, |
| 1139 | EVENT_CMD_COMPLETE)) |
| 1140 | break; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1141 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1142 | host->cmd = NULL; |
| 1143 | atmci_set_completed(host, EVENT_CMD_COMPLETE); |
| 1144 | atmci_command_complete(host, mrq->cmd); |
| 1145 | if (!mrq->data || cmd->error) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1146 | atmci_request_end(host, host->mrq); |
| 1147 | goto unlock; |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1148 | } |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1149 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1150 | prev_state = state = STATE_SENDING_DATA; |
| 1151 | /* fall through */ |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1152 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1153 | case STATE_SENDING_DATA: |
| 1154 | if (atmci_test_and_clear_pending(host, |
| 1155 | EVENT_DATA_ERROR)) { |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1156 | atmci_stop_dma(host); |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1157 | if (data->stop) |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1158 | send_stop_cmd(host, data); |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1159 | state = STATE_DATA_ERROR; |
| 1160 | break; |
| 1161 | } |
| 1162 | |
| 1163 | if (!atmci_test_and_clear_pending(host, |
| 1164 | EVENT_XFER_COMPLETE)) |
| 1165 | break; |
| 1166 | |
| 1167 | atmci_set_completed(host, EVENT_XFER_COMPLETE); |
| 1168 | prev_state = state = STATE_DATA_BUSY; |
| 1169 | /* fall through */ |
| 1170 | |
| 1171 | case STATE_DATA_BUSY: |
| 1172 | if (!atmci_test_and_clear_pending(host, |
| 1173 | EVENT_DATA_COMPLETE)) |
| 1174 | break; |
| 1175 | |
| 1176 | host->data = NULL; |
| 1177 | atmci_set_completed(host, EVENT_DATA_COMPLETE); |
| 1178 | status = host->data_status; |
| 1179 | if (unlikely(status & ATMCI_DATA_ERROR_FLAGS)) { |
| 1180 | if (status & MCI_DTOE) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1181 | dev_dbg(&host->pdev->dev, |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1182 | "data timeout error\n"); |
| 1183 | data->error = -ETIMEDOUT; |
| 1184 | } else if (status & MCI_DCRCE) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1185 | dev_dbg(&host->pdev->dev, |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1186 | "data CRC error\n"); |
| 1187 | data->error = -EILSEQ; |
| 1188 | } else { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1189 | dev_dbg(&host->pdev->dev, |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1190 | "data FIFO error (status=%08x)\n", |
| 1191 | status); |
| 1192 | data->error = -EIO; |
| 1193 | } |
| 1194 | } else { |
| 1195 | data->bytes_xfered = data->blocks * data->blksz; |
| 1196 | data->error = 0; |
| 1197 | } |
| 1198 | |
| 1199 | if (!data->stop) { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1200 | atmci_request_end(host, host->mrq); |
| 1201 | goto unlock; |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1202 | } |
| 1203 | |
| 1204 | prev_state = state = STATE_SENDING_STOP; |
| 1205 | if (!data->error) |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1206 | send_stop_cmd(host, data); |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1207 | /* fall through */ |
| 1208 | |
| 1209 | case STATE_SENDING_STOP: |
| 1210 | if (!atmci_test_and_clear_pending(host, |
| 1211 | EVENT_CMD_COMPLETE)) |
| 1212 | break; |
| 1213 | |
| 1214 | host->cmd = NULL; |
| 1215 | atmci_command_complete(host, mrq->stop); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1216 | atmci_request_end(host, host->mrq); |
| 1217 | goto unlock; |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1218 | |
| 1219 | case STATE_DATA_ERROR: |
| 1220 | if (!atmci_test_and_clear_pending(host, |
| 1221 | EVENT_XFER_COMPLETE)) |
| 1222 | break; |
| 1223 | |
| 1224 | state = STATE_DATA_BUSY; |
| 1225 | break; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1226 | } |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1227 | } while (state != prev_state); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1228 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1229 | host->state = state; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1230 | |
| 1231 | unlock: |
| 1232 | spin_unlock(&host->lock); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1233 | } |
| 1234 | |
| 1235 | static void atmci_read_data_pio(struct atmel_mci *host) |
| 1236 | { |
| 1237 | struct scatterlist *sg = host->sg; |
| 1238 | void *buf = sg_virt(sg); |
| 1239 | unsigned int offset = host->pio_offset; |
| 1240 | struct mmc_data *data = host->data; |
| 1241 | u32 value; |
| 1242 | u32 status; |
| 1243 | unsigned int nbytes = 0; |
| 1244 | |
| 1245 | do { |
| 1246 | value = mci_readl(host, RDR); |
| 1247 | if (likely(offset + 4 <= sg->length)) { |
| 1248 | put_unaligned(value, (u32 *)(buf + offset)); |
| 1249 | |
| 1250 | offset += 4; |
| 1251 | nbytes += 4; |
| 1252 | |
| 1253 | if (offset == sg->length) { |
Haavard Skinnemoen | 5e7184a | 2008-10-05 15:27:50 +0200 | [diff] [blame] | 1254 | flush_dcache_page(sg_page(sg)); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1255 | host->sg = sg = sg_next(sg); |
| 1256 | if (!sg) |
| 1257 | goto done; |
| 1258 | |
| 1259 | offset = 0; |
| 1260 | buf = sg_virt(sg); |
| 1261 | } |
| 1262 | } else { |
| 1263 | unsigned int remaining = sg->length - offset; |
| 1264 | memcpy(buf + offset, &value, remaining); |
| 1265 | nbytes += remaining; |
| 1266 | |
| 1267 | flush_dcache_page(sg_page(sg)); |
| 1268 | host->sg = sg = sg_next(sg); |
| 1269 | if (!sg) |
| 1270 | goto done; |
| 1271 | |
| 1272 | offset = 4 - remaining; |
| 1273 | buf = sg_virt(sg); |
| 1274 | memcpy(buf, (u8 *)&value + remaining, offset); |
| 1275 | nbytes += offset; |
| 1276 | } |
| 1277 | |
| 1278 | status = mci_readl(host, SR); |
| 1279 | if (status & ATMCI_DATA_ERROR_FLAGS) { |
| 1280 | mci_writel(host, IDR, (MCI_NOTBUSY | MCI_RXRDY |
| 1281 | | ATMCI_DATA_ERROR_FLAGS)); |
| 1282 | host->data_status = status; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1283 | data->bytes_xfered += nbytes; |
| 1284 | smp_wmb(); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1285 | atmci_set_pending(host, EVENT_DATA_ERROR); |
| 1286 | tasklet_schedule(&host->tasklet); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1287 | return; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1288 | } |
| 1289 | } while (status & MCI_RXRDY); |
| 1290 | |
| 1291 | host->pio_offset = offset; |
| 1292 | data->bytes_xfered += nbytes; |
| 1293 | |
| 1294 | return; |
| 1295 | |
| 1296 | done: |
| 1297 | mci_writel(host, IDR, MCI_RXRDY); |
| 1298 | mci_writel(host, IER, MCI_NOTBUSY); |
| 1299 | data->bytes_xfered += nbytes; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1300 | smp_wmb(); |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1301 | atmci_set_pending(host, EVENT_XFER_COMPLETE); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1302 | } |
| 1303 | |
| 1304 | static void atmci_write_data_pio(struct atmel_mci *host) |
| 1305 | { |
| 1306 | struct scatterlist *sg = host->sg; |
| 1307 | void *buf = sg_virt(sg); |
| 1308 | unsigned int offset = host->pio_offset; |
| 1309 | struct mmc_data *data = host->data; |
| 1310 | u32 value; |
| 1311 | u32 status; |
| 1312 | unsigned int nbytes = 0; |
| 1313 | |
| 1314 | do { |
| 1315 | if (likely(offset + 4 <= sg->length)) { |
| 1316 | value = get_unaligned((u32 *)(buf + offset)); |
| 1317 | mci_writel(host, TDR, value); |
| 1318 | |
| 1319 | offset += 4; |
| 1320 | nbytes += 4; |
| 1321 | if (offset == sg->length) { |
| 1322 | host->sg = sg = sg_next(sg); |
| 1323 | if (!sg) |
| 1324 | goto done; |
| 1325 | |
| 1326 | offset = 0; |
| 1327 | buf = sg_virt(sg); |
| 1328 | } |
| 1329 | } else { |
| 1330 | unsigned int remaining = sg->length - offset; |
| 1331 | |
| 1332 | value = 0; |
| 1333 | memcpy(&value, buf + offset, remaining); |
| 1334 | nbytes += remaining; |
| 1335 | |
| 1336 | host->sg = sg = sg_next(sg); |
| 1337 | if (!sg) { |
| 1338 | mci_writel(host, TDR, value); |
| 1339 | goto done; |
| 1340 | } |
| 1341 | |
| 1342 | offset = 4 - remaining; |
| 1343 | buf = sg_virt(sg); |
| 1344 | memcpy((u8 *)&value + remaining, buf, offset); |
| 1345 | mci_writel(host, TDR, value); |
| 1346 | nbytes += offset; |
| 1347 | } |
| 1348 | |
| 1349 | status = mci_readl(host, SR); |
| 1350 | if (status & ATMCI_DATA_ERROR_FLAGS) { |
| 1351 | mci_writel(host, IDR, (MCI_NOTBUSY | MCI_TXRDY |
| 1352 | | ATMCI_DATA_ERROR_FLAGS)); |
| 1353 | host->data_status = status; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1354 | data->bytes_xfered += nbytes; |
| 1355 | smp_wmb(); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1356 | atmci_set_pending(host, EVENT_DATA_ERROR); |
| 1357 | tasklet_schedule(&host->tasklet); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1358 | return; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1359 | } |
| 1360 | } while (status & MCI_TXRDY); |
| 1361 | |
| 1362 | host->pio_offset = offset; |
| 1363 | data->bytes_xfered += nbytes; |
| 1364 | |
| 1365 | return; |
| 1366 | |
| 1367 | done: |
| 1368 | mci_writel(host, IDR, MCI_TXRDY); |
| 1369 | mci_writel(host, IER, MCI_NOTBUSY); |
| 1370 | data->bytes_xfered += nbytes; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1371 | smp_wmb(); |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1372 | atmci_set_pending(host, EVENT_XFER_COMPLETE); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1373 | } |
| 1374 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1375 | static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1376 | { |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1377 | mci_writel(host, IDR, MCI_CMDRDY); |
| 1378 | |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1379 | host->cmd_status = status; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1380 | smp_wmb(); |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1381 | atmci_set_pending(host, EVENT_CMD_COMPLETE); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1382 | tasklet_schedule(&host->tasklet); |
| 1383 | } |
| 1384 | |
| 1385 | static irqreturn_t atmci_interrupt(int irq, void *dev_id) |
| 1386 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1387 | struct atmel_mci *host = dev_id; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1388 | u32 status, mask, pending; |
| 1389 | unsigned int pass_count = 0; |
| 1390 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1391 | do { |
| 1392 | status = mci_readl(host, SR); |
| 1393 | mask = mci_readl(host, IMR); |
| 1394 | pending = status & mask; |
| 1395 | if (!pending) |
| 1396 | break; |
| 1397 | |
| 1398 | if (pending & ATMCI_DATA_ERROR_FLAGS) { |
| 1399 | mci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS |
| 1400 | | MCI_RXRDY | MCI_TXRDY); |
| 1401 | pending &= mci_readl(host, IMR); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1402 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1403 | host->data_status = status; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1404 | smp_wmb(); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1405 | atmci_set_pending(host, EVENT_DATA_ERROR); |
| 1406 | tasklet_schedule(&host->tasklet); |
| 1407 | } |
| 1408 | if (pending & MCI_NOTBUSY) { |
Haavard Skinnemoen | c06ad25 | 2008-07-31 14:49:16 +0200 | [diff] [blame] | 1409 | mci_writel(host, IDR, |
| 1410 | ATMCI_DATA_ERROR_FLAGS | MCI_NOTBUSY); |
Haavard Skinnemoen | ca55f46 | 2008-10-05 15:16:59 +0200 | [diff] [blame] | 1411 | if (!host->data_status) |
| 1412 | host->data_status = status; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1413 | smp_wmb(); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1414 | atmci_set_pending(host, EVENT_DATA_COMPLETE); |
| 1415 | tasklet_schedule(&host->tasklet); |
| 1416 | } |
| 1417 | if (pending & MCI_RXRDY) |
| 1418 | atmci_read_data_pio(host); |
| 1419 | if (pending & MCI_TXRDY) |
| 1420 | atmci_write_data_pio(host); |
| 1421 | |
| 1422 | if (pending & MCI_CMDRDY) |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1423 | atmci_cmd_interrupt(host, status); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1424 | } while (pass_count++ < 5); |
| 1425 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1426 | return pass_count ? IRQ_HANDLED : IRQ_NONE; |
| 1427 | } |
| 1428 | |
| 1429 | static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id) |
| 1430 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1431 | struct atmel_mci_slot *slot = dev_id; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1432 | |
| 1433 | /* |
| 1434 | * Disable interrupts until the pin has stabilized and check |
| 1435 | * the state then. Use mod_timer() since we may be in the |
| 1436 | * middle of the timer routine when this interrupt triggers. |
| 1437 | */ |
| 1438 | disable_irq_nosync(irq); |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1439 | mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20)); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1440 | |
| 1441 | return IRQ_HANDLED; |
| 1442 | } |
| 1443 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1444 | static int __init atmci_init_slot(struct atmel_mci *host, |
| 1445 | struct mci_slot_pdata *slot_data, unsigned int id, |
| 1446 | u32 sdc_reg) |
| 1447 | { |
| 1448 | struct mmc_host *mmc; |
| 1449 | struct atmel_mci_slot *slot; |
| 1450 | |
| 1451 | mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev); |
| 1452 | if (!mmc) |
| 1453 | return -ENOMEM; |
| 1454 | |
| 1455 | slot = mmc_priv(mmc); |
| 1456 | slot->mmc = mmc; |
| 1457 | slot->host = host; |
| 1458 | slot->detect_pin = slot_data->detect_pin; |
| 1459 | slot->wp_pin = slot_data->wp_pin; |
| 1460 | slot->sdc_reg = sdc_reg; |
| 1461 | |
| 1462 | mmc->ops = &atmci_ops; |
| 1463 | mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512); |
| 1464 | mmc->f_max = host->bus_hz / 2; |
| 1465 | mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; |
| 1466 | if (slot_data->bus_width >= 4) |
| 1467 | mmc->caps |= MMC_CAP_4_BIT_DATA; |
| 1468 | |
| 1469 | mmc->max_hw_segs = 64; |
| 1470 | mmc->max_phys_segs = 64; |
| 1471 | mmc->max_req_size = 32768 * 512; |
| 1472 | mmc->max_blk_size = 32768; |
| 1473 | mmc->max_blk_count = 512; |
| 1474 | |
| 1475 | /* Assume card is present initially */ |
| 1476 | set_bit(ATMCI_CARD_PRESENT, &slot->flags); |
| 1477 | if (gpio_is_valid(slot->detect_pin)) { |
| 1478 | if (gpio_request(slot->detect_pin, "mmc_detect")) { |
| 1479 | dev_dbg(&mmc->class_dev, "no detect pin available\n"); |
| 1480 | slot->detect_pin = -EBUSY; |
| 1481 | } else if (gpio_get_value(slot->detect_pin)) { |
| 1482 | clear_bit(ATMCI_CARD_PRESENT, &slot->flags); |
| 1483 | } |
| 1484 | } |
| 1485 | |
| 1486 | if (!gpio_is_valid(slot->detect_pin)) |
| 1487 | mmc->caps |= MMC_CAP_NEEDS_POLL; |
| 1488 | |
| 1489 | if (gpio_is_valid(slot->wp_pin)) { |
| 1490 | if (gpio_request(slot->wp_pin, "mmc_wp")) { |
| 1491 | dev_dbg(&mmc->class_dev, "no WP pin available\n"); |
| 1492 | slot->wp_pin = -EBUSY; |
| 1493 | } |
| 1494 | } |
| 1495 | |
| 1496 | host->slot[id] = slot; |
| 1497 | mmc_add_host(mmc); |
| 1498 | |
| 1499 | if (gpio_is_valid(slot->detect_pin)) { |
| 1500 | int ret; |
| 1501 | |
| 1502 | setup_timer(&slot->detect_timer, atmci_detect_change, |
| 1503 | (unsigned long)slot); |
| 1504 | |
| 1505 | ret = request_irq(gpio_to_irq(slot->detect_pin), |
| 1506 | atmci_detect_interrupt, |
| 1507 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| 1508 | "mmc-detect", slot); |
| 1509 | if (ret) { |
| 1510 | dev_dbg(&mmc->class_dev, |
| 1511 | "could not request IRQ %d for detect pin\n", |
| 1512 | gpio_to_irq(slot->detect_pin)); |
| 1513 | gpio_free(slot->detect_pin); |
| 1514 | slot->detect_pin = -EBUSY; |
| 1515 | } |
| 1516 | } |
| 1517 | |
| 1518 | atmci_init_debugfs(slot); |
| 1519 | |
| 1520 | return 0; |
| 1521 | } |
| 1522 | |
| 1523 | static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot, |
| 1524 | unsigned int id) |
| 1525 | { |
| 1526 | /* Debugfs stuff is cleaned up by mmc core */ |
| 1527 | |
| 1528 | set_bit(ATMCI_SHUTDOWN, &slot->flags); |
| 1529 | smp_wmb(); |
| 1530 | |
| 1531 | mmc_remove_host(slot->mmc); |
| 1532 | |
| 1533 | if (gpio_is_valid(slot->detect_pin)) { |
| 1534 | int pin = slot->detect_pin; |
| 1535 | |
| 1536 | free_irq(gpio_to_irq(pin), slot); |
| 1537 | del_timer_sync(&slot->detect_timer); |
| 1538 | gpio_free(pin); |
| 1539 | } |
| 1540 | if (gpio_is_valid(slot->wp_pin)) |
| 1541 | gpio_free(slot->wp_pin); |
| 1542 | |
| 1543 | slot->host->slot[id] = NULL; |
| 1544 | mmc_free_host(slot->mmc); |
| 1545 | } |
| 1546 | |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame^] | 1547 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
| 1548 | static enum dma_state_client filter(struct dma_chan *chan, void *slave) |
| 1549 | { |
| 1550 | struct dw_dma_slave *dws = slave; |
| 1551 | |
| 1552 | if (dws->dma_dev == chan->device->dev) |
| 1553 | return DMA_ACK; |
| 1554 | else |
| 1555 | return DMA_DUP; |
| 1556 | } |
| 1557 | #endif |
| 1558 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1559 | static int __init atmci_probe(struct platform_device *pdev) |
| 1560 | { |
| 1561 | struct mci_platform_data *pdata; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1562 | struct atmel_mci *host; |
| 1563 | struct resource *regs; |
| 1564 | unsigned int nr_slots; |
| 1565 | int irq; |
| 1566 | int ret; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1567 | |
| 1568 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1569 | if (!regs) |
| 1570 | return -ENXIO; |
| 1571 | pdata = pdev->dev.platform_data; |
| 1572 | if (!pdata) |
| 1573 | return -ENXIO; |
| 1574 | irq = platform_get_irq(pdev, 0); |
| 1575 | if (irq < 0) |
| 1576 | return irq; |
| 1577 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1578 | host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL); |
| 1579 | if (!host) |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1580 | return -ENOMEM; |
| 1581 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1582 | host->pdev = pdev; |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1583 | spin_lock_init(&host->lock); |
| 1584 | INIT_LIST_HEAD(&host->queue); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1585 | |
| 1586 | host->mck = clk_get(&pdev->dev, "mci_clk"); |
| 1587 | if (IS_ERR(host->mck)) { |
| 1588 | ret = PTR_ERR(host->mck); |
| 1589 | goto err_clk_get; |
| 1590 | } |
| 1591 | |
| 1592 | ret = -ENOMEM; |
| 1593 | host->regs = ioremap(regs->start, regs->end - regs->start + 1); |
| 1594 | if (!host->regs) |
| 1595 | goto err_ioremap; |
| 1596 | |
| 1597 | clk_enable(host->mck); |
| 1598 | mci_writel(host, CR, MCI_CR_SWRST); |
| 1599 | host->bus_hz = clk_get_rate(host->mck); |
| 1600 | clk_disable(host->mck); |
| 1601 | |
| 1602 | host->mapbase = regs->start; |
| 1603 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1604 | tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1605 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1606 | ret = request_irq(irq, atmci_interrupt, 0, pdev->dev.bus_id, host); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1607 | if (ret) |
| 1608 | goto err_request_irq; |
| 1609 | |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1610 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame^] | 1611 | if (pdata->dma_slave.dma_dev) { |
| 1612 | struct dw_dma_slave *dws = &pdata->dma_slave; |
| 1613 | dma_cap_mask_t mask; |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1614 | |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame^] | 1615 | dws->tx_reg = regs->start + MCI_TDR; |
| 1616 | dws->rx_reg = regs->start + MCI_RDR; |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1617 | |
| 1618 | /* Try to grab a DMA channel */ |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame^] | 1619 | dma_cap_zero(mask); |
| 1620 | dma_cap_set(DMA_SLAVE, mask); |
| 1621 | host->dma.chan = dma_request_channel(mask, filter, dws); |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1622 | } |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame^] | 1623 | if (!host->dma.chan) |
| 1624 | dev_notice(&pdev->dev, "DMA not available, using PIO\n"); |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1625 | #endif /* CONFIG_MMC_ATMELMCI_DMA */ |
| 1626 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1627 | platform_set_drvdata(pdev, host); |
| 1628 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1629 | /* We need at least one slot to succeed */ |
| 1630 | nr_slots = 0; |
| 1631 | ret = -ENODEV; |
| 1632 | if (pdata->slot[0].bus_width) { |
| 1633 | ret = atmci_init_slot(host, &pdata->slot[0], |
| 1634 | MCI_SDCSEL_SLOT_A, 0); |
| 1635 | if (!ret) |
| 1636 | nr_slots++; |
| 1637 | } |
| 1638 | if (pdata->slot[1].bus_width) { |
| 1639 | ret = atmci_init_slot(host, &pdata->slot[1], |
| 1640 | MCI_SDCSEL_SLOT_B, 1); |
| 1641 | if (!ret) |
| 1642 | nr_slots++; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1643 | } |
| 1644 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1645 | if (!nr_slots) |
| 1646 | goto err_init_slot; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1647 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1648 | dev_info(&pdev->dev, |
| 1649 | "Atmel MCI controller at 0x%08lx irq %d, %u slots\n", |
| 1650 | host->mapbase, irq, nr_slots); |
Haavard Skinnemoen | deec9ae | 2008-07-24 14:18:59 +0200 | [diff] [blame] | 1651 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1652 | return 0; |
| 1653 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1654 | err_init_slot: |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1655 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame^] | 1656 | if (host->dma.chan) |
| 1657 | dma_release_channel(host->dma.chan); |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1658 | #endif |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1659 | free_irq(irq, host); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1660 | err_request_irq: |
| 1661 | iounmap(host->regs); |
| 1662 | err_ioremap: |
| 1663 | clk_put(host->mck); |
| 1664 | err_clk_get: |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1665 | kfree(host); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1666 | return ret; |
| 1667 | } |
| 1668 | |
| 1669 | static int __exit atmci_remove(struct platform_device *pdev) |
| 1670 | { |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1671 | struct atmel_mci *host = platform_get_drvdata(pdev); |
| 1672 | unsigned int i; |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1673 | |
| 1674 | platform_set_drvdata(pdev, NULL); |
| 1675 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1676 | for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { |
| 1677 | if (host->slot[i]) |
| 1678 | atmci_cleanup_slot(host->slot[i], i); |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1679 | } |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1680 | |
| 1681 | clk_enable(host->mck); |
| 1682 | mci_writel(host, IDR, ~0UL); |
| 1683 | mci_writel(host, CR, MCI_CR_MCIDIS); |
| 1684 | mci_readl(host, SR); |
| 1685 | clk_disable(host->mck); |
| 1686 | |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1687 | #ifdef CONFIG_MMC_ATMELMCI_DMA |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame^] | 1688 | if (host->dma.chan) |
| 1689 | dma_release_channel(host->dma.chan); |
Haavard Skinnemoen | 65e8b08 | 2008-07-30 20:29:03 +0200 | [diff] [blame] | 1690 | #endif |
| 1691 | |
Haavard Skinnemoen | 965ebf3 | 2008-09-17 20:53:55 +0200 | [diff] [blame] | 1692 | free_irq(platform_get_irq(pdev, 0), host); |
| 1693 | iounmap(host->regs); |
| 1694 | |
| 1695 | clk_put(host->mck); |
| 1696 | kfree(host); |
| 1697 | |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1698 | return 0; |
| 1699 | } |
| 1700 | |
| 1701 | static struct platform_driver atmci_driver = { |
| 1702 | .remove = __exit_p(atmci_remove), |
| 1703 | .driver = { |
| 1704 | .name = "atmel_mci", |
| 1705 | }, |
| 1706 | }; |
| 1707 | |
| 1708 | static int __init atmci_init(void) |
| 1709 | { |
| 1710 | return platform_driver_probe(&atmci_driver, atmci_probe); |
| 1711 | } |
| 1712 | |
| 1713 | static void __exit atmci_exit(void) |
| 1714 | { |
| 1715 | platform_driver_unregister(&atmci_driver); |
| 1716 | } |
| 1717 | |
Dan Williams | 74465b4 | 2009-01-06 11:38:16 -0700 | [diff] [blame^] | 1718 | late_initcall(atmci_init); /* try to load after dma driver when built-in */ |
Haavard Skinnemoen | 7d2be07 | 2008-06-30 18:35:03 +0200 | [diff] [blame] | 1719 | module_exit(atmci_exit); |
| 1720 | |
| 1721 | MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver"); |
| 1722 | MODULE_AUTHOR("Haavard Skinnemoen <haavard.skinnemoen@atmel.com>"); |
| 1723 | MODULE_LICENSE("GPL v2"); |