2 * linux/drivers/mmc/host/pxa.c - PXA MMCI driver
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
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.
10 * This hardware is really sick:
11 * - No way to clear interrupts.
12 * - Have to turn off the clock whenever we touch the device.
13 * - Doesn't tell you how many data blocks were transferred.
16 * 1 and 3 byte data transfers not supported
17 * max block length up to 1023
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/ioport.h>
22 #include <linux/platform_device.h>
23 #include <linux/delay.h>
24 #include <linux/interrupt.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/clk.h>
27 #include <linux/err.h>
28 #include <linux/mmc/host.h>
32 #include <asm/sizes.h>
34 #include <mach/pxa-regs.h>
39 #define DRIVER_NAME "pxa2xx-mci"
42 #define CLKRT_OFF (~0)
50 unsigned long clkrate;
56 unsigned int power_mode;
57 struct pxamci_platform_data *pdata;
59 struct mmc_request *mrq;
60 struct mmc_command *cmd;
61 struct mmc_data *data;
64 struct pxa_dma_desc *sg_cpu;
68 unsigned int dma_drcmrrx;
69 unsigned int dma_drcmrtx;
72 static void pxamci_stop_clock(struct pxamci_host *host)
74 if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
75 unsigned long timeout = 10000;
78 writel(STOP_CLOCK, host->base + MMC_STRPCL);
81 v = readl(host->base + MMC_STAT);
82 if (!(v & STAT_CLK_EN))
88 dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
92 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
96 spin_lock_irqsave(&host->lock, flags);
98 writel(host->imask, host->base + MMC_I_MASK);
99 spin_unlock_irqrestore(&host->lock, flags);
102 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
106 spin_lock_irqsave(&host->lock, flags);
108 writel(host->imask, host->base + MMC_I_MASK);
109 spin_unlock_irqrestore(&host->lock, flags);
112 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
114 unsigned int nob = data->blocks;
115 unsigned long long clks;
116 unsigned int timeout;
123 if (data->flags & MMC_DATA_STREAM)
126 writel(nob, host->base + MMC_NOB);
127 writel(data->blksz, host->base + MMC_BLKLEN);
129 clks = (unsigned long long)data->timeout_ns * host->clkrate;
130 do_div(clks, 1000000000UL);
131 timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
132 writel((timeout + 255) / 256, host->base + MMC_RDTO);
134 if (data->flags & MMC_DATA_READ) {
135 host->dma_dir = DMA_FROM_DEVICE;
136 dcmd = DCMD_INCTRGADDR | DCMD_FLOWTRG;
137 DRCMR(host->dma_drcmrtx) = 0;
138 DRCMR(host->dma_drcmrrx) = host->dma | DRCMR_MAPVLD;
140 host->dma_dir = DMA_TO_DEVICE;
141 dcmd = DCMD_INCSRCADDR | DCMD_FLOWSRC;
142 DRCMR(host->dma_drcmrrx) = 0;
143 DRCMR(host->dma_drcmrtx) = host->dma | DRCMR_MAPVLD;
146 dcmd |= DCMD_BURST32 | DCMD_WIDTH1;
148 host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
151 for (i = 0; i < host->dma_len; i++) {
152 unsigned int length = sg_dma_len(&data->sg[i]);
153 host->sg_cpu[i].dcmd = dcmd | length;
154 if (length & 31 && !(data->flags & MMC_DATA_READ))
155 host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
156 /* Not aligned to 8-byte boundary? */
157 if (sg_dma_address(&data->sg[i]) & 0x7)
159 if (data->flags & MMC_DATA_READ) {
160 host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
161 host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
163 host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
164 host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
166 host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
167 sizeof(struct pxa_dma_desc);
169 host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
173 * The PXA27x DMA controller encounters overhead when working with
174 * unaligned (to 8-byte boundaries) data, so switch on byte alignment
175 * mode only if we have unaligned data.
178 DALGN |= (1 << host->dma);
180 DALGN &= ~(1 << host->dma);
181 DDADR(host->dma) = host->sg_dma;
182 DCSR(host->dma) = DCSR_RUN;
185 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
187 WARN_ON(host->cmd != NULL);
190 if (cmd->flags & MMC_RSP_BUSY)
193 #define RSP_TYPE(x) ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
194 switch (RSP_TYPE(mmc_resp_type(cmd))) {
195 case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
196 cmdat |= CMDAT_RESP_SHORT;
198 case RSP_TYPE(MMC_RSP_R3):
199 cmdat |= CMDAT_RESP_R3;
201 case RSP_TYPE(MMC_RSP_R2):
202 cmdat |= CMDAT_RESP_R2;
208 writel(cmd->opcode, host->base + MMC_CMD);
209 writel(cmd->arg >> 16, host->base + MMC_ARGH);
210 writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
211 writel(cmdat, host->base + MMC_CMDAT);
212 writel(host->clkrt, host->base + MMC_CLKRT);
214 writel(START_CLOCK, host->base + MMC_STRPCL);
216 pxamci_enable_irq(host, END_CMD_RES);
219 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
224 mmc_request_done(host->mmc, mrq);
227 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
229 struct mmc_command *cmd = host->cmd;
239 * Did I mention this is Sick. We always need to
240 * discard the upper 8 bits of the first 16-bit word.
242 v = readl(host->base + MMC_RES) & 0xffff;
243 for (i = 0; i < 4; i++) {
244 u32 w1 = readl(host->base + MMC_RES) & 0xffff;
245 u32 w2 = readl(host->base + MMC_RES) & 0xffff;
246 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
250 if (stat & STAT_TIME_OUT_RESPONSE) {
251 cmd->error = -ETIMEDOUT;
252 } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
255 * workaround for erratum #42:
256 * Intel PXA27x Family Processor Specification Update Rev 001
257 * A bogus CRC error can appear if the msb of a 136 bit
260 if (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000) {
261 pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
264 cmd->error = -EILSEQ;
267 pxamci_disable_irq(host, END_CMD_RES);
268 if (host->data && !cmd->error) {
269 pxamci_enable_irq(host, DATA_TRAN_DONE);
271 pxamci_finish_request(host, host->mrq);
277 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
279 struct mmc_data *data = host->data;
285 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
288 if (stat & STAT_READ_TIME_OUT)
289 data->error = -ETIMEDOUT;
290 else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
291 data->error = -EILSEQ;
294 * There appears to be a hardware design bug here. There seems to
295 * be no way to find out how much data was transferred to the card.
296 * This means that if there was an error on any block, we mark all
297 * data blocks as being in error.
300 data->bytes_xfered = data->blocks * data->blksz;
302 data->bytes_xfered = 0;
304 pxamci_disable_irq(host, DATA_TRAN_DONE);
307 if (host->mrq->stop) {
308 pxamci_stop_clock(host);
309 pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
311 pxamci_finish_request(host, host->mrq);
317 static irqreturn_t pxamci_irq(int irq, void *devid)
319 struct pxamci_host *host = devid;
323 ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
326 unsigned stat = readl(host->base + MMC_STAT);
328 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
330 if (ireg & END_CMD_RES)
331 handled |= pxamci_cmd_done(host, stat);
332 if (ireg & DATA_TRAN_DONE)
333 handled |= pxamci_data_done(host, stat);
334 if (ireg & SDIO_INT) {
335 mmc_signal_sdio_irq(host->mmc);
340 return IRQ_RETVAL(handled);
343 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
345 struct pxamci_host *host = mmc_priv(mmc);
348 WARN_ON(host->mrq != NULL);
352 pxamci_stop_clock(host);
355 host->cmdat &= ~CMDAT_INIT;
358 pxamci_setup_data(host, mrq->data);
360 cmdat &= ~CMDAT_BUSY;
361 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
362 if (mrq->data->flags & MMC_DATA_WRITE)
363 cmdat |= CMDAT_WRITE;
365 if (mrq->data->flags & MMC_DATA_STREAM)
366 cmdat |= CMDAT_STREAM;
369 pxamci_start_cmd(host, mrq->cmd, cmdat);
372 static int pxamci_get_ro(struct mmc_host *mmc)
374 struct pxamci_host *host = mmc_priv(mmc);
376 if (host->pdata && host->pdata->get_ro)
377 return !!host->pdata->get_ro(mmc_dev(mmc));
379 * Board doesn't support read only detection; let the mmc core
385 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
387 struct pxamci_host *host = mmc_priv(mmc);
390 unsigned long rate = host->clkrate;
391 unsigned int clk = rate / ios->clock;
393 if (host->clkrt == CLKRT_OFF)
394 clk_enable(host->clk);
396 if (ios->clock == 26000000) {
397 /* to support 26MHz on pxa300/pxa310 */
400 /* to handle (19.5MHz, 26MHz) */
405 * clk might result in a lower divisor than we
406 * desire. check for that condition and adjust
409 if (rate / clk > ios->clock)
411 host->clkrt = fls(clk) - 1;
415 * we write clkrt on the next command
418 pxamci_stop_clock(host);
419 if (host->clkrt != CLKRT_OFF) {
420 host->clkrt = CLKRT_OFF;
421 clk_disable(host->clk);
425 if (host->power_mode != ios->power_mode) {
426 host->power_mode = ios->power_mode;
428 if (host->pdata && host->pdata->setpower)
429 host->pdata->setpower(mmc_dev(mmc), ios->vdd);
431 if (ios->power_mode == MMC_POWER_ON)
432 host->cmdat |= CMDAT_INIT;
435 if (ios->bus_width == MMC_BUS_WIDTH_4)
436 host->cmdat |= CMDAT_SD_4DAT;
438 host->cmdat &= ~CMDAT_SD_4DAT;
440 pr_debug("PXAMCI: clkrt = %x cmdat = %x\n",
441 host->clkrt, host->cmdat);
444 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
446 struct pxamci_host *pxa_host = mmc_priv(host);
449 pxamci_enable_irq(pxa_host, SDIO_INT);
451 pxamci_disable_irq(pxa_host, SDIO_INT);
454 static const struct mmc_host_ops pxamci_ops = {
455 .request = pxamci_request,
456 .get_ro = pxamci_get_ro,
457 .set_ios = pxamci_set_ios,
458 .enable_sdio_irq = pxamci_enable_sdio_irq,
461 static void pxamci_dma_irq(int dma, void *devid)
463 struct pxamci_host *host = devid;
464 int dcsr = DCSR(dma);
465 DCSR(dma) = dcsr & ~DCSR_STOPIRQEN;
467 if (dcsr & DCSR_ENDINTR) {
468 writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
470 printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
471 mmc_hostname(host->mmc), dma, dcsr);
472 host->data->error = -EIO;
473 pxamci_data_done(host, 0);
477 static irqreturn_t pxamci_detect_irq(int irq, void *devid)
479 struct pxamci_host *host = mmc_priv(devid);
481 mmc_detect_change(devid, host->pdata->detect_delay);
485 static int pxamci_probe(struct platform_device *pdev)
487 struct mmc_host *mmc;
488 struct pxamci_host *host = NULL;
489 struct resource *r, *dmarx, *dmatx;
492 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
493 irq = platform_get_irq(pdev, 0);
497 r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
501 mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
507 mmc->ops = &pxamci_ops;
510 * We can do SG-DMA, but we don't because we never know how much
511 * data we successfully wrote to the card.
513 mmc->max_phys_segs = NR_SG;
516 * Our hardware DMA can handle a maximum of one page per SG entry.
518 mmc->max_seg_size = PAGE_SIZE;
521 * Block length register is only 10 bits before PXA27x.
523 mmc->max_blk_size = (cpu_is_pxa21x() || cpu_is_pxa25x()) ? 1023 : 2048;
526 * Block count register is 16 bits.
528 mmc->max_blk_count = 65535;
530 host = mmc_priv(mmc);
533 host->pdata = pdev->dev.platform_data;
534 host->clkrt = CLKRT_OFF;
536 host->clk = clk_get(&pdev->dev, "MMCCLK");
537 if (IS_ERR(host->clk)) {
538 ret = PTR_ERR(host->clk);
543 host->clkrate = clk_get_rate(host->clk);
546 * Calculate minimum clock rate, rounding up.
548 mmc->f_min = (host->clkrate + 63) / 64;
549 mmc->f_max = (cpu_is_pxa300() || cpu_is_pxa310()) ? 26000000
552 mmc->ocr_avail = host->pdata ?
553 host->pdata->ocr_mask :
554 MMC_VDD_32_33|MMC_VDD_33_34;
557 if (!cpu_is_pxa21x() && !cpu_is_pxa25x()) {
558 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
559 host->cmdat |= CMDAT_SDIO_INT_EN;
560 if (cpu_is_pxa300() || cpu_is_pxa310())
561 mmc->caps |= MMC_CAP_MMC_HIGHSPEED |
562 MMC_CAP_SD_HIGHSPEED;
565 host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
571 spin_lock_init(&host->lock);
574 host->imask = MMC_I_MASK_ALL;
576 host->base = ioremap(r->start, SZ_4K);
583 * Ensure that the host controller is shut down, and setup
586 pxamci_stop_clock(host);
587 writel(0, host->base + MMC_SPI);
588 writel(64, host->base + MMC_RESTO);
589 writel(host->imask, host->base + MMC_I_MASK);
591 host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
592 pxamci_dma_irq, host);
598 ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
602 platform_set_drvdata(pdev, mmc);
604 dmarx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
609 host->dma_drcmrrx = dmarx->start;
611 dmatx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
616 host->dma_drcmrtx = dmatx->start;
618 if (host->pdata && host->pdata->init)
619 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
628 pxa_free_dma(host->dma);
632 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
642 static int pxamci_remove(struct platform_device *pdev)
644 struct mmc_host *mmc = platform_get_drvdata(pdev);
646 platform_set_drvdata(pdev, NULL);
649 struct pxamci_host *host = mmc_priv(mmc);
651 if (host->pdata && host->pdata->exit)
652 host->pdata->exit(&pdev->dev, mmc);
654 mmc_remove_host(mmc);
656 pxamci_stop_clock(host);
657 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
658 END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
659 host->base + MMC_I_MASK);
661 DRCMR(host->dma_drcmrrx) = 0;
662 DRCMR(host->dma_drcmrtx) = 0;
664 free_irq(host->irq, host);
665 pxa_free_dma(host->dma);
667 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
671 release_resource(host->res);
679 static int pxamci_suspend(struct platform_device *dev, pm_message_t state)
681 struct mmc_host *mmc = platform_get_drvdata(dev);
685 ret = mmc_suspend_host(mmc, state);
690 static int pxamci_resume(struct platform_device *dev)
692 struct mmc_host *mmc = platform_get_drvdata(dev);
696 ret = mmc_resume_host(mmc);
701 #define pxamci_suspend NULL
702 #define pxamci_resume NULL
705 static struct platform_driver pxamci_driver = {
706 .probe = pxamci_probe,
707 .remove = pxamci_remove,
708 .suspend = pxamci_suspend,
709 .resume = pxamci_resume,
712 .owner = THIS_MODULE,
716 static int __init pxamci_init(void)
718 return platform_driver_register(&pxamci_driver);
721 static void __exit pxamci_exit(void)
723 platform_driver_unregister(&pxamci_driver);
726 module_init(pxamci_init);
727 module_exit(pxamci_exit);
729 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
730 MODULE_LICENSE("GPL");
731 MODULE_ALIAS("platform:pxa2xx-mci");