3 * Rob Emanuele <rob@emanuele.us>
4 * Reinhard Meyer, EMK Elektronik <reinhard.meyer@emk-elektronik.de>
7 * Copyright (C) 2004-2006 Atmel Corporation
9 * SPDX-License-Identifier: GPL-2.0+
19 #include <linux/errno.h>
20 #include <asm/byteorder.h>
21 #include <asm/arch/clk.h>
22 #include <asm/arch/hardware.h>
23 #include "atmel_mci.h"
25 DECLARE_GLOBAL_DATA_PTR;
27 #ifndef CONFIG_SYS_MMC_CLK_OD
28 # define CONFIG_SYS_MMC_CLK_OD 150000
31 #define MMC_DEFAULT_BLKLEN 512
33 #if defined(CONFIG_ATMEL_MCI_PORTB)
39 struct atmel_mci_priv {
40 struct mmc_config cfg;
41 struct atmel_mci *mci;
42 unsigned int initialized:1;
43 unsigned int curr_clk;
50 /* Read Atmel MCI IP version */
51 static unsigned int atmel_mci_get_version(struct atmel_mci *mci)
53 return readl(&mci->version) & 0x00000fff;
57 * Print command and status:
59 * - always when DEBUG is defined
62 static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg)
64 debug("gen_atmel_mci: CMDR %08x (%2u) ARGR %08x (SR: %08x) %s\n",
65 cmdr, cmdr & 0x3F, arg, status, msg);
68 /* Setup for MCI Clock and Block Size */
70 static void mci_set_mode(struct atmel_mci_priv *priv, u32 hz, u32 blklen)
72 struct mmc *mmc = &priv->mmc;
73 u32 bus_hz = priv->bus_clk_rate;
75 static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
77 struct atmel_mci_priv *priv = mmc->priv;
78 u32 bus_hz = get_mci_clk_rate();
81 atmel_mci_t *mci = priv->mci;
83 unsigned int version = atmel_mci_get_version(mci);
87 debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n",
90 if (version >= 0x500) {
91 clkdiv = DIV_ROUND_UP(bus_hz, hz) - 2;
98 debug("mci: setting clock %u Hz, block size %u\n",
99 bus_hz / (clkdiv * 2 + clkodd + 2), blklen);
101 /* find clkdiv yielding a rate <= than requested */
102 for (clkdiv = 0; clkdiv < 255; clkdiv++) {
103 if ((bus_hz / (clkdiv + 1) / 2) <= hz)
106 debug("mci: setting clock %u Hz, block size %u\n",
107 (bus_hz / (clkdiv + 1)) / 2, blklen);
111 if (version >= 0x500)
112 priv->curr_clk = bus_hz / (clkdiv * 2 + clkodd + 2);
114 priv->curr_clk = (bus_hz / (clkdiv + 1)) / 2;
117 mr = MMCI_BF(CLKDIV, clkdiv);
119 /* MCI IP version >= 0x200 has R/WPROOF */
120 if (version >= 0x200)
121 mr |= MMCI_BIT(RDPROOF) | MMCI_BIT(WRPROOF);
124 * MCI IP version >= 0x500 use bit 16 as clkodd.
125 * MCI IP version < 0x500 use upper 16 bits for blklen.
127 if (version >= 0x500)
128 mr |= MMCI_BF(CLKODD, clkodd);
130 mr |= MMCI_BF(BLKLEN, blklen);
132 writel(mr, &mci->mr);
134 /* MCI IP version >= 0x200 has blkr */
135 if (version >= 0x200)
136 writel(MMCI_BF(BLKLEN, blklen), &mci->blkr);
138 if (mmc->card_caps & mmc->cfg->host_caps & MMC_MODE_HS)
139 writel(MMCI_BIT(HSMODE), &mci->cfg);
141 priv->initialized = 1;
144 /* Return the CMDR with flags for a given command and data packet */
145 static u32 mci_encode_cmd(
146 struct mmc_cmd *cmd, struct mmc_data *data, u32* error_flags)
150 /* Default Flags for Errors */
151 *error_flags |= (MMCI_BIT(DTOE) | MMCI_BIT(RDIRE) | MMCI_BIT(RENDE) |
152 MMCI_BIT(RINDE) | MMCI_BIT(RTOE));
154 /* Default Flags for the Command */
155 cmdr |= MMCI_BIT(MAXLAT);
158 cmdr |= MMCI_BF(TRCMD, 1);
159 if (data->blocks > 1)
160 cmdr |= MMCI_BF(TRTYP, 1);
161 if (data->flags & MMC_DATA_READ)
162 cmdr |= MMCI_BIT(TRDIR);
165 if (cmd->resp_type & MMC_RSP_CRC)
166 *error_flags |= MMCI_BIT(RCRCE);
167 if (cmd->resp_type & MMC_RSP_136)
168 cmdr |= MMCI_BF(RSPTYP, 2);
169 else if (cmd->resp_type & MMC_RSP_BUSY)
170 cmdr |= MMCI_BF(RSPTYP, 3);
171 else if (cmd->resp_type & MMC_RSP_PRESENT)
172 cmdr |= MMCI_BF(RSPTYP, 1);
174 return cmdr | MMCI_BF(CMDNB, cmd->cmdidx);
177 /* Entered into function pointer in mci_send_cmd */
178 static u32 mci_data_read(atmel_mci_t *mci, u32* data, u32 error_flags)
183 status = readl(&mci->sr);
184 if (status & (error_flags | MMCI_BIT(OVRE)))
186 } while (!(status & MMCI_BIT(RXRDY)));
188 if (status & MMCI_BIT(RXRDY)) {
189 *data = readl(&mci->rdr);
196 /* Entered into function pointer in mci_send_cmd */
197 static u32 mci_data_write(atmel_mci_t *mci, u32* data, u32 error_flags)
202 status = readl(&mci->sr);
203 if (status & (error_flags | MMCI_BIT(UNRE)))
205 } while (!(status & MMCI_BIT(TXRDY)));
207 if (status & MMCI_BIT(TXRDY)) {
208 writel(*data, &mci->tdr);
216 * Entered into mmc structure during driver init
218 * Sends a command out on the bus and deals with the block data.
219 * Takes the mmc pointer, a command pointer, and an optional data pointer.
222 static int atmel_mci_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
223 struct mmc_data *data)
225 struct atmel_mci_priv *priv = dev_get_priv(dev);
226 struct mmc *mmc = mmc_get_mmc_dev(dev);
229 mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
231 struct atmel_mci_priv *priv = mmc->priv;
233 atmel_mci_t *mci = priv->mci;
238 if (!priv->initialized) {
239 puts ("MCI not initialized!\n");
243 /* Figure out the transfer arguments */
244 cmdr = mci_encode_cmd(cmd, data, &error_flags);
246 /* For multi blocks read/write, set the block register */
247 if ((cmd->cmdidx == MMC_CMD_READ_MULTIPLE_BLOCK)
248 || (cmd->cmdidx == MMC_CMD_WRITE_MULTIPLE_BLOCK))
249 writel(data->blocks | MMCI_BF(BLKLEN, mmc->read_bl_len),
252 /* Send the command */
253 writel(cmd->cmdarg, &mci->argr);
254 writel(cmdr, &mci->cmdr);
257 dump_cmd(cmdr, cmd->cmdarg, 0, "DEBUG");
260 /* Wait for the command to complete */
261 while (!((status = readl(&mci->sr)) & MMCI_BIT(CMDRDY)));
263 if ((status & error_flags) & MMCI_BIT(RTOE)) {
264 dump_cmd(cmdr, cmd->cmdarg, status, "Command Time Out");
266 } else if (status & error_flags) {
267 dump_cmd(cmdr, cmd->cmdarg, status, "Command Failed");
271 /* Copy the response to the response buffer */
272 if (cmd->resp_type & MMC_RSP_136) {
273 cmd->response[0] = readl(&mci->rspr);
274 cmd->response[1] = readl(&mci->rspr1);
275 cmd->response[2] = readl(&mci->rspr2);
276 cmd->response[3] = readl(&mci->rspr3);
278 cmd->response[0] = readl(&mci->rspr);
280 /* transfer all of the blocks */
282 u32 word_count, block_count;
284 u32 sys_blocksize, dummy, i;
286 (atmel_mci_t *mci, u32* data, u32 error_flags);
288 if (data->flags & MMC_DATA_READ) {
289 mci_data_op = mci_data_read;
290 sys_blocksize = mmc->read_bl_len;
291 ioptr = (u32*)data->dest;
293 mci_data_op = mci_data_write;
294 sys_blocksize = mmc->write_bl_len;
295 ioptr = (u32*)data->src;
299 for (block_count = 0;
300 block_count < data->blocks && !status;
304 status = mci_data_op(mci, ioptr, error_flags);
307 } while (!status && word_count < (data->blocksize/4));
309 if (data->flags & MMC_DATA_READ)
311 u32 cnt = word_count * 4;
312 printf("Read Data:\n");
313 print_buffer(0, data->dest + cnt * block_count,
318 if (!status && word_count < (sys_blocksize / 4))
319 printf("filling rest of block...\n");
321 /* fill the rest of a full block */
322 while (!status && word_count < (sys_blocksize / 4)) {
323 status = mci_data_op(mci, &dummy,
328 dump_cmd(cmdr, cmd->cmdarg, status,
329 "Data Transfer Failed");
334 /* Wait for Transfer End */
337 status = readl(&mci->sr);
339 if (status & error_flags) {
340 dump_cmd(cmdr, cmd->cmdarg, status,
345 } while ((status & MMCI_BIT(DTIP)) && i < 10000);
346 if (status & MMCI_BIT(DTIP)) {
347 dump_cmd(cmdr, cmd->cmdarg, status,
348 "XFER DTIP never unset, ignoring");
353 * After the switch command, wait for 8 clocks before the next
356 if (cmd->cmdidx == MMC_CMD_SWITCH)
357 udelay(8*1000000 / priv->curr_clk); /* 8 clk in us */
363 static int atmel_mci_set_ios(struct udevice *dev)
365 struct atmel_mci_priv *priv = dev_get_priv(dev);
366 struct mmc *mmc = mmc_get_mmc_dev(dev);
368 /* Entered into mmc structure during driver init */
369 static int mci_set_ios(struct mmc *mmc)
371 struct atmel_mci_priv *priv = mmc->priv;
373 atmel_mci_t *mci = priv->mci;
374 int bus_width = mmc->bus_width;
375 unsigned int version = atmel_mci_get_version(mci);
378 /* Set the clock speed */
380 mci_set_mode(priv, mmc->clock, MMC_DEFAULT_BLKLEN);
382 mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN);
386 * set the bus width and select slot for this interface
387 * there is no capability for multiple slots on the same interface yet
389 if ((version & 0xf00) >= 0x300) {
402 writel(busw << 6 | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
404 busw = (bus_width == 4) ? 1 : 0;
406 writel(busw << 7 | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
413 static int atmel_mci_hw_init(struct atmel_mci_priv *priv)
416 /* Entered into mmc structure during driver init */
417 static int mci_init(struct mmc *mmc)
419 struct atmel_mci_priv *priv = mmc->priv;
421 atmel_mci_t *mci = priv->mci;
423 /* Initialize controller */
424 writel(MMCI_BIT(SWRST), &mci->cr); /* soft reset */
425 writel(MMCI_BIT(PWSDIS), &mci->cr); /* disable power save */
426 writel(MMCI_BIT(MCIEN), &mci->cr); /* enable mci */
427 writel(MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr); /* select port */
429 /* This delay can be optimized, but stick with max value */
430 writel(0x7f, &mci->dtor);
431 /* Disable Interrupts */
432 writel(~0UL, &mci->idr);
434 /* Set default clocks and blocklen */
436 mci_set_mode(priv, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
438 mci_set_mode(mmc, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
444 #ifndef CONFIG_DM_MMC
445 static const struct mmc_ops atmel_mci_ops = {
446 .send_cmd = mci_send_cmd,
447 .set_ios = mci_set_ios,
452 * This is the only exported function
454 * Call it with the MCI register base address
456 int atmel_mci_init(void *regs)
459 struct mmc_config *cfg;
460 struct atmel_mci_priv *priv;
461 unsigned int version;
463 priv = calloc(1, sizeof(*priv));
470 cfg->ops = &atmel_mci_ops;
472 priv->mci = (struct atmel_mci *)regs;
473 priv->initialized = 0;
475 /* need to be able to pass these in on a board by board basis */
476 cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
477 version = atmel_mci_get_version(priv->mci);
478 if ((version & 0xf00) >= 0x300) {
479 cfg->host_caps = MMC_MODE_8BIT;
480 cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz;
483 cfg->host_caps |= MMC_MODE_4BIT;
486 * min and max frequencies determined by
487 * max and min of clock divider
489 cfg->f_min = get_mci_clk_rate() / (2*256);
490 cfg->f_max = get_mci_clk_rate() / (2*1);
492 cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
494 mmc = mmc_create(cfg, priv);
500 /* NOTE: possibly leaking the priv structure */
507 static const struct dm_mmc_ops atmel_mci_mmc_ops = {
508 .send_cmd = atmel_mci_send_cmd,
509 .set_ios = atmel_mci_set_ios,
512 static void atmel_mci_setup_cfg(struct atmel_mci_priv *priv)
514 struct mmc_config *cfg;
518 cfg->name = "Atmel mci";
519 cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
522 * If the version is above 3.0, the capabilities of the 8-bit
523 * bus width and high speed are supported.
525 version = atmel_mci_get_version(priv->mci);
526 if ((version & 0xf00) >= 0x300) {
527 cfg->host_caps = MMC_MODE_8BIT |
528 MMC_MODE_HS | MMC_MODE_HS_52MHz;
531 cfg->host_caps |= MMC_MODE_4BIT;
532 cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
533 cfg->f_min = priv->bus_clk_rate / (2 * 256);
534 cfg->f_max = priv->bus_clk_rate / 2;
537 static int atmel_mci_enable_clk(struct udevice *dev)
539 struct atmel_mci_priv *priv = dev_get_priv(dev);
544 ret = clk_get_by_index(dev, 0, &clk);
550 ret = clk_enable(&clk);
554 clk_rate = clk_get_rate(&clk);
560 priv->bus_clk_rate = clk_rate;
568 static int atmel_mci_probe(struct udevice *dev)
570 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
571 struct atmel_mci_priv *priv = dev_get_priv(dev);
575 ret = atmel_mci_enable_clk(dev);
579 priv->mci = (struct atmel_mci *)devfdt_get_addr_ptr(dev);
581 atmel_mci_setup_cfg(priv);
584 mmc->cfg = &priv->cfg;
588 atmel_mci_hw_init(priv);
593 static int atmel_mci_bind(struct udevice *dev)
595 struct atmel_mci_priv *priv = dev_get_priv(dev);
597 return mmc_bind(dev, &priv->mmc, &priv->cfg);
600 static const struct udevice_id atmel_mci_ids[] = {
601 { .compatible = "atmel,hsmci" },
605 U_BOOT_DRIVER(atmel_mci) = {
608 .of_match = atmel_mci_ids,
609 .bind = atmel_mci_bind,
610 .probe = atmel_mci_probe,
611 .priv_auto_alloc_size = sizeof(struct atmel_mci_priv),
612 .ops = &atmel_mci_mmc_ops,