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/scatterlist.h>
33 #include <asm/sizes.h>
35 #include <asm/arch/pxa-regs.h>
36 #include <asm/arch/mmc.h>
40 #define DRIVER_NAME "pxa2xx-mci"
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;
70 static void pxamci_stop_clock(struct pxamci_host *host)
72 if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
73 unsigned long timeout = 10000;
76 writel(STOP_CLOCK, host->base + MMC_STRPCL);
79 v = readl(host->base + MMC_STAT);
80 if (!(v & STAT_CLK_EN))
86 dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
90 static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
94 spin_lock_irqsave(&host->lock, flags);
96 writel(host->imask, host->base + MMC_I_MASK);
97 spin_unlock_irqrestore(&host->lock, flags);
100 static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
104 spin_lock_irqsave(&host->lock, flags);
106 writel(host->imask, host->base + MMC_I_MASK);
107 spin_unlock_irqrestore(&host->lock, flags);
110 static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
112 unsigned int nob = data->blocks;
113 unsigned long long clks;
114 unsigned int timeout;
120 if (data->flags & MMC_DATA_STREAM)
123 writel(nob, host->base + MMC_NOB);
124 writel(data->blksz, host->base + MMC_BLKLEN);
126 clks = (unsigned long long)data->timeout_ns * host->clkrate;
127 do_div(clks, 1000000000UL);
128 timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
129 writel((timeout + 255) / 256, host->base + MMC_RDTO);
131 if (data->flags & MMC_DATA_READ) {
132 host->dma_dir = DMA_FROM_DEVICE;
133 dcmd = DCMD_INCTRGADDR | DCMD_FLOWTRG;
135 DRCMRRXMMC = host->dma | DRCMR_MAPVLD;
137 host->dma_dir = DMA_TO_DEVICE;
138 dcmd = DCMD_INCSRCADDR | DCMD_FLOWSRC;
140 DRCMRTXMMC = host->dma | DRCMR_MAPVLD;
143 dcmd |= DCMD_BURST32 | DCMD_WIDTH1;
145 host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
148 for (i = 0; i < host->dma_len; i++) {
149 unsigned int length = sg_dma_len(&data->sg[i]);
150 host->sg_cpu[i].dcmd = dcmd | length;
151 if (length & 31 && !(data->flags & MMC_DATA_READ))
152 host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
153 if (data->flags & MMC_DATA_READ) {
154 host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
155 host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
157 host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
158 host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
160 host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
161 sizeof(struct pxa_dma_desc);
163 host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
166 DDADR(host->dma) = host->sg_dma;
167 DCSR(host->dma) = DCSR_RUN;
170 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
172 WARN_ON(host->cmd != NULL);
175 if (cmd->flags & MMC_RSP_BUSY)
178 #define RSP_TYPE(x) ((x) & ~(MMC_RSP_BUSY|MMC_RSP_OPCODE))
179 switch (RSP_TYPE(mmc_resp_type(cmd))) {
180 case RSP_TYPE(MMC_RSP_R1): /* r1, r1b, r6, r7 */
181 cmdat |= CMDAT_RESP_SHORT;
183 case RSP_TYPE(MMC_RSP_R3):
184 cmdat |= CMDAT_RESP_R3;
186 case RSP_TYPE(MMC_RSP_R2):
187 cmdat |= CMDAT_RESP_R2;
193 writel(cmd->opcode, host->base + MMC_CMD);
194 writel(cmd->arg >> 16, host->base + MMC_ARGH);
195 writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
196 writel(cmdat, host->base + MMC_CMDAT);
197 writel(host->clkrt, host->base + MMC_CLKRT);
199 writel(START_CLOCK, host->base + MMC_STRPCL);
201 pxamci_enable_irq(host, END_CMD_RES);
204 static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
209 mmc_request_done(host->mmc, mrq);
212 static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
214 struct mmc_command *cmd = host->cmd;
224 * Did I mention this is Sick. We always need to
225 * discard the upper 8 bits of the first 16-bit word.
227 v = readl(host->base + MMC_RES) & 0xffff;
228 for (i = 0; i < 4; i++) {
229 u32 w1 = readl(host->base + MMC_RES) & 0xffff;
230 u32 w2 = readl(host->base + MMC_RES) & 0xffff;
231 cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
235 if (stat & STAT_TIME_OUT_RESPONSE) {
236 cmd->error = -ETIMEDOUT;
237 } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
240 * workaround for erratum #42:
241 * Intel PXA27x Family Processor Specification Update Rev 001
242 * A bogus CRC error can appear if the msb of a 136 bit
245 if (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000) {
246 pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
249 cmd->error = -EILSEQ;
252 pxamci_disable_irq(host, END_CMD_RES);
253 if (host->data && !cmd->error) {
254 pxamci_enable_irq(host, DATA_TRAN_DONE);
256 pxamci_finish_request(host, host->mrq);
262 static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
264 struct mmc_data *data = host->data;
270 dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
273 if (stat & STAT_READ_TIME_OUT)
274 data->error = -ETIMEDOUT;
275 else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
276 data->error = -EILSEQ;
279 * There appears to be a hardware design bug here. There seems to
280 * be no way to find out how much data was transferred to the card.
281 * This means that if there was an error on any block, we mark all
282 * data blocks as being in error.
285 data->bytes_xfered = data->blocks * data->blksz;
287 data->bytes_xfered = 0;
289 pxamci_disable_irq(host, DATA_TRAN_DONE);
292 if (host->mrq->stop) {
293 pxamci_stop_clock(host);
294 pxamci_start_cmd(host, host->mrq->stop, host->cmdat);
296 pxamci_finish_request(host, host->mrq);
302 static irqreturn_t pxamci_irq(int irq, void *devid)
304 struct pxamci_host *host = devid;
308 ireg = readl(host->base + MMC_I_REG) & ~readl(host->base + MMC_I_MASK);
311 unsigned stat = readl(host->base + MMC_STAT);
313 pr_debug("PXAMCI: irq %08x stat %08x\n", ireg, stat);
315 if (ireg & END_CMD_RES)
316 handled |= pxamci_cmd_done(host, stat);
317 if (ireg & DATA_TRAN_DONE)
318 handled |= pxamci_data_done(host, stat);
319 if (ireg & SDIO_INT) {
320 mmc_signal_sdio_irq(host->mmc);
325 return IRQ_RETVAL(handled);
328 static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
330 struct pxamci_host *host = mmc_priv(mmc);
333 WARN_ON(host->mrq != NULL);
337 pxamci_stop_clock(host);
340 host->cmdat &= ~CMDAT_INIT;
343 pxamci_setup_data(host, mrq->data);
345 cmdat &= ~CMDAT_BUSY;
346 cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
347 if (mrq->data->flags & MMC_DATA_WRITE)
348 cmdat |= CMDAT_WRITE;
350 if (mrq->data->flags & MMC_DATA_STREAM)
351 cmdat |= CMDAT_STREAM;
354 pxamci_start_cmd(host, mrq->cmd, cmdat);
357 static int pxamci_get_ro(struct mmc_host *mmc)
359 struct pxamci_host *host = mmc_priv(mmc);
361 if (host->pdata && host->pdata->get_ro)
362 return host->pdata->get_ro(mmc_dev(mmc));
363 /* Host doesn't support read only detection so assume writeable */
367 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
369 struct pxamci_host *host = mmc_priv(mmc);
372 unsigned long rate = host->clkrate;
373 unsigned int clk = rate / ios->clock;
376 * clk might result in a lower divisor than we
377 * desire. check for that condition and adjust
380 if (rate / clk > ios->clock)
382 host->clkrt = fls(clk) - 1;
383 clk_enable(host->clk);
386 * we write clkrt on the next command
389 pxamci_stop_clock(host);
390 clk_disable(host->clk);
393 if (host->power_mode != ios->power_mode) {
394 host->power_mode = ios->power_mode;
396 if (host->pdata && host->pdata->setpower)
397 host->pdata->setpower(mmc_dev(mmc), ios->vdd);
399 if (ios->power_mode == MMC_POWER_ON)
400 host->cmdat |= CMDAT_INIT;
403 if (ios->bus_width == MMC_BUS_WIDTH_4)
404 host->cmdat |= CMDAT_SD_4DAT;
406 host->cmdat &= ~CMDAT_SD_4DAT;
408 pr_debug("PXAMCI: clkrt = %x cmdat = %x\n",
409 host->clkrt, host->cmdat);
412 static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
414 struct pxamci_host *pxa_host = mmc_priv(host);
417 pxamci_enable_irq(pxa_host, SDIO_INT);
419 pxamci_disable_irq(pxa_host, SDIO_INT);
422 static const struct mmc_host_ops pxamci_ops = {
423 .request = pxamci_request,
424 .get_ro = pxamci_get_ro,
425 .set_ios = pxamci_set_ios,
426 .enable_sdio_irq = pxamci_enable_sdio_irq,
429 static void pxamci_dma_irq(int dma, void *devid)
431 struct pxamci_host *host = devid;
432 int dcsr = DCSR(dma);
433 DCSR(dma) = dcsr & ~DCSR_STOPIRQEN;
435 if (dcsr & DCSR_ENDINTR) {
436 writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
438 printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
439 mmc_hostname(host->mmc), dma, dcsr);
440 host->data->error = -EIO;
441 pxamci_data_done(host, 0);
445 static irqreturn_t pxamci_detect_irq(int irq, void *devid)
447 struct pxamci_host *host = mmc_priv(devid);
449 mmc_detect_change(devid, host->pdata->detect_delay);
453 static int pxamci_probe(struct platform_device *pdev)
455 struct mmc_host *mmc;
456 struct pxamci_host *host = NULL;
460 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
461 irq = platform_get_irq(pdev, 0);
465 r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
469 mmc = mmc_alloc_host(sizeof(struct pxamci_host), &pdev->dev);
475 mmc->ops = &pxamci_ops;
478 * We can do SG-DMA, but we don't because we never know how much
479 * data we successfully wrote to the card.
481 mmc->max_phys_segs = NR_SG;
484 * Our hardware DMA can handle a maximum of one page per SG entry.
486 mmc->max_seg_size = PAGE_SIZE;
489 * Block length register is only 10 bits before PXA27x.
491 mmc->max_blk_size = (cpu_is_pxa21x() || cpu_is_pxa25x()) ? 1023 : 2048;
494 * Block count register is 16 bits.
496 mmc->max_blk_count = 65535;
498 host = mmc_priv(mmc);
501 host->pdata = pdev->dev.platform_data;
503 host->clk = clk_get(&pdev->dev, "MMCCLK");
504 if (IS_ERR(host->clk)) {
505 ret = PTR_ERR(host->clk);
510 host->clkrate = clk_get_rate(host->clk);
513 * Calculate minimum clock rate, rounding up.
515 mmc->f_min = (host->clkrate + 63) / 64;
516 mmc->f_max = host->clkrate;
518 mmc->ocr_avail = host->pdata ?
519 host->pdata->ocr_mask :
520 MMC_VDD_32_33|MMC_VDD_33_34;
523 if (!cpu_is_pxa21x() && !cpu_is_pxa25x()) {
524 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
525 host->cmdat |= CMDAT_SDIO_INT_EN;
528 host->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
534 spin_lock_init(&host->lock);
537 host->imask = MMC_I_MASK_ALL;
539 host->base = ioremap(r->start, SZ_4K);
546 * Ensure that the host controller is shut down, and setup
549 pxamci_stop_clock(host);
550 writel(0, host->base + MMC_SPI);
551 writel(64, host->base + MMC_RESTO);
552 writel(host->imask, host->base + MMC_I_MASK);
554 host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
555 pxamci_dma_irq, host);
561 ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
565 platform_set_drvdata(pdev, mmc);
567 if (host->pdata && host->pdata->init)
568 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
577 pxa_free_dma(host->dma);
581 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
591 static int pxamci_remove(struct platform_device *pdev)
593 struct mmc_host *mmc = platform_get_drvdata(pdev);
595 platform_set_drvdata(pdev, NULL);
598 struct pxamci_host *host = mmc_priv(mmc);
600 if (host->pdata && host->pdata->exit)
601 host->pdata->exit(&pdev->dev, mmc);
603 mmc_remove_host(mmc);
605 pxamci_stop_clock(host);
606 writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
607 END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
608 host->base + MMC_I_MASK);
613 free_irq(host->irq, host);
614 pxa_free_dma(host->dma);
616 dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
620 release_resource(host->res);
628 static int pxamci_suspend(struct platform_device *dev, pm_message_t state)
630 struct mmc_host *mmc = platform_get_drvdata(dev);
634 ret = mmc_suspend_host(mmc, state);
639 static int pxamci_resume(struct platform_device *dev)
641 struct mmc_host *mmc = platform_get_drvdata(dev);
645 ret = mmc_resume_host(mmc);
650 #define pxamci_suspend NULL
651 #define pxamci_resume NULL
654 static struct platform_driver pxamci_driver = {
655 .probe = pxamci_probe,
656 .remove = pxamci_remove,
657 .suspend = pxamci_suspend,
658 .resume = pxamci_resume,
664 static int __init pxamci_init(void)
666 return platform_driver_register(&pxamci_driver);
669 static void __exit pxamci_exit(void)
671 platform_driver_unregister(&pxamci_driver);
674 module_init(pxamci_init);
675 module_exit(pxamci_exit);
677 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
678 MODULE_LICENSE("GPL");