2 * linux/drivers/mmc/core/mmc_ops.h
4 * Copyright 2006-2007 Pierre Ossman
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
12 #include <linux/types.h>
13 #include <linux/scatterlist.h>
15 #include <linux/mmc/host.h>
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/mmc.h>
22 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
25 struct mmc_command cmd;
29 memset(&cmd, 0, sizeof(struct mmc_command));
31 cmd.opcode = MMC_SELECT_CARD;
34 cmd.arg = card->rca << 16;
35 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
38 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
41 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
48 int mmc_select_card(struct mmc_card *card)
52 return _mmc_select_card(card->host, card);
55 int mmc_deselect_cards(struct mmc_host *host)
57 return _mmc_select_card(host, NULL);
60 int mmc_card_sleepawake(struct mmc_host *host, int sleep)
62 struct mmc_command cmd;
63 struct mmc_card *card = host->card;
67 mmc_deselect_cards(host);
69 memset(&cmd, 0, sizeof(struct mmc_command));
71 cmd.opcode = MMC_SLEEP_AWAKE;
72 cmd.arg = card->rca << 16;
76 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
77 err = mmc_wait_for_cmd(host, &cmd, 0);
82 * If the host does not wait while the card signals busy, then we will
83 * will have to wait the sleep/awake timeout. Note, we cannot use the
84 * SEND_STATUS command to poll the status because that command (and most
85 * others) is invalid while the card sleeps.
87 if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
88 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
91 err = mmc_select_card(card);
96 int mmc_go_idle(struct mmc_host *host)
99 struct mmc_command cmd;
102 * Non-SPI hosts need to prevent chipselect going active during
103 * GO_IDLE; that would put chips into SPI mode. Remind them of
104 * that in case of hardware that won't pull up DAT3/nCS otherwise.
106 * SPI hosts ignore ios.chip_select; it's managed according to
107 * rules that must accomodate non-MMC slaves which this layer
108 * won't even know about.
110 if (!mmc_host_is_spi(host)) {
111 mmc_set_chip_select(host, MMC_CS_HIGH);
115 memset(&cmd, 0, sizeof(struct mmc_command));
117 cmd.opcode = MMC_GO_IDLE_STATE;
119 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
121 err = mmc_wait_for_cmd(host, &cmd, 0);
125 if (!mmc_host_is_spi(host)) {
126 mmc_set_chip_select(host, MMC_CS_DONTCARE);
130 host->use_spi_crc = 0;
135 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
137 struct mmc_command cmd;
142 memset(&cmd, 0, sizeof(struct mmc_command));
144 cmd.opcode = MMC_SEND_OP_COND;
145 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
146 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
148 for (i = 100; i; i--) {
149 err = mmc_wait_for_cmd(host, &cmd, 0);
153 /* if we're just probing, do a single pass */
157 /* otherwise wait until reset completes */
158 if (mmc_host_is_spi(host)) {
159 if (!(cmd.resp[0] & R1_SPI_IDLE))
162 if (cmd.resp[0] & MMC_CARD_BUSY)
171 if (rocr && !mmc_host_is_spi(host))
177 int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
180 struct mmc_command cmd;
185 memset(&cmd, 0, sizeof(struct mmc_command));
187 cmd.opcode = MMC_ALL_SEND_CID;
189 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
191 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
195 memcpy(cid, cmd.resp, sizeof(u32) * 4);
200 int mmc_set_relative_addr(struct mmc_card *card)
203 struct mmc_command cmd;
208 memset(&cmd, 0, sizeof(struct mmc_command));
210 cmd.opcode = MMC_SET_RELATIVE_ADDR;
211 cmd.arg = card->rca << 16;
212 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
214 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
222 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
225 struct mmc_command cmd;
230 memset(&cmd, 0, sizeof(struct mmc_command));
234 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
236 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
240 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
246 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
247 u32 opcode, void *buf, unsigned len)
249 struct mmc_request mrq;
250 struct mmc_command cmd;
251 struct mmc_data data;
252 struct scatterlist sg;
255 /* dma onto stack is unsafe/nonportable, but callers to this
256 * routine normally provide temporary on-stack buffers ...
258 data_buf = kmalloc(len, GFP_KERNEL);
259 if (data_buf == NULL)
262 memset(&mrq, 0, sizeof(struct mmc_request));
263 memset(&cmd, 0, sizeof(struct mmc_command));
264 memset(&data, 0, sizeof(struct mmc_data));
272 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
273 * rely on callers to never use this with "native" calls for reading
274 * CSD or CID. Native versions of those commands use the R2 type,
275 * not R1 plus a data block.
277 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
281 data.flags = MMC_DATA_READ;
285 sg_init_one(&sg, data_buf, len);
287 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
289 * The spec states that CSR and CID accesses have a timeout
290 * of 64 clock cycles.
293 data.timeout_clks = 64;
295 mmc_set_data_timeout(&data, card);
297 mmc_wait_for_req(host, &mrq);
299 memcpy(buf, data_buf, len);
310 int mmc_send_csd(struct mmc_card *card, u32 *csd)
314 if (!mmc_host_is_spi(card->host))
315 return mmc_send_cxd_native(card->host, card->rca << 16,
318 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
322 for (i = 0;i < 4;i++)
323 csd[i] = be32_to_cpu(csd[i]);
328 int mmc_send_cid(struct mmc_host *host, u32 *cid)
332 if (!mmc_host_is_spi(host)) {
335 return mmc_send_cxd_native(host, host->card->rca << 16,
339 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
343 for (i = 0;i < 4;i++)
344 cid[i] = be32_to_cpu(cid[i]);
349 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
351 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
355 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
357 struct mmc_command cmd;
360 memset(&cmd, 0, sizeof(struct mmc_command));
362 cmd.opcode = MMC_SPI_READ_OCR;
363 cmd.arg = highcap ? (1 << 30) : 0;
364 cmd.flags = MMC_RSP_SPI_R3;
366 err = mmc_wait_for_cmd(host, &cmd, 0);
372 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
374 struct mmc_command cmd;
377 memset(&cmd, 0, sizeof(struct mmc_command));
379 cmd.opcode = MMC_SPI_CRC_ON_OFF;
380 cmd.flags = MMC_RSP_SPI_R1;
383 err = mmc_wait_for_cmd(host, &cmd, 0);
385 host->use_spi_crc = use_crc;
389 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
392 struct mmc_command cmd;
398 memset(&cmd, 0, sizeof(struct mmc_command));
400 cmd.opcode = MMC_SWITCH;
401 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
405 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
407 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
411 /* Must check status to be sure of no errors */
413 err = mmc_send_status(card, &status);
416 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
418 if (mmc_host_is_spi(card->host))
420 } while (R1_CURRENT_STATE(status) == 7);
422 if (mmc_host_is_spi(card->host)) {
423 if (status & R1_SPI_ILLEGAL_COMMAND)
426 if (status & 0xFDFFA000)
427 printk(KERN_WARNING "%s: unexpected status %#x after "
428 "switch", mmc_hostname(card->host), status);
429 if (status & R1_SWITCH_ERROR)
436 int mmc_send_status(struct mmc_card *card, u32 *status)
439 struct mmc_command cmd;
444 memset(&cmd, 0, sizeof(struct mmc_command));
446 cmd.opcode = MMC_SEND_STATUS;
447 if (!mmc_host_is_spi(card->host))
448 cmd.arg = card->rca << 16;
449 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
451 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
455 /* NOTE: callers are required to understand the difference
456 * between "native" and SPI format status words!
459 *status = cmd.resp[0];