2 * linux/drivers/mmc/mmci.c - ARM PrimeCell MMCI PL180/1 driver
4 * Copyright (C) 2003 Deep Blue Solutions, Ltd, 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 #include <linux/module.h>
11 #include <linux/moduleparam.h>
12 #include <linux/init.h>
13 #include <linux/ioport.h>
14 #include <linux/device.h>
15 #include <linux/interrupt.h>
16 #include <linux/delay.h>
17 #include <linux/err.h>
18 #include <linux/highmem.h>
19 #include <linux/mmc/host.h>
20 #include <linux/mmc/protocol.h>
21 #include <linux/amba/bus.h>
22 #include <linux/clk.h>
24 #include <asm/cacheflush.h>
25 #include <asm/div64.h>
27 #include <asm/scatterlist.h>
28 #include <asm/sizes.h>
29 #include <asm/mach/mmc.h>
33 #define DRIVER_NAME "mmci-pl18x"
35 #define DBG(host,fmt,args...) \
36 pr_debug("%s: %s: " fmt, mmc_hostname(host->mmc), __func__ , args)
38 static unsigned int fmax = 515633;
41 mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
43 writel(0, host->base + MMCICOMMAND);
51 mrq->data->bytes_xfered = host->data_xfered;
54 * Need to drop the host lock here; mmc_request_done may call
55 * back into the driver...
57 spin_unlock(&host->lock);
58 mmc_request_done(host->mmc, mrq);
59 spin_lock(&host->lock);
62 static void mmci_stop_data(struct mmci_host *host)
64 writel(0, host->base + MMCIDATACTRL);
65 writel(0, host->base + MMCIMASK1);
69 static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
71 unsigned int datactrl, timeout, irqmask;
72 unsigned long long clks;
76 DBG(host, "blksz %04x blks %04x flags %08x\n",
77 data->blksz, data->blocks, data->flags);
80 host->size = data->blksz;
81 host->data_xfered = 0;
83 mmci_init_sg(host, data);
85 clks = (unsigned long long)data->timeout_ns * host->cclk;
86 do_div(clks, 1000000000UL);
88 timeout = data->timeout_clks + (unsigned int)clks;
91 writel(timeout, base + MMCIDATATIMER);
92 writel(host->size, base + MMCIDATALENGTH);
94 blksz_bits = ffs(data->blksz) - 1;
95 BUG_ON(1 << blksz_bits != data->blksz);
97 datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
98 if (data->flags & MMC_DATA_READ) {
99 datactrl |= MCI_DPSM_DIRECTION;
100 irqmask = MCI_RXFIFOHALFFULLMASK;
103 * If we have less than a FIFOSIZE of bytes to transfer,
104 * trigger a PIO interrupt as soon as any data is available.
106 if (host->size < MCI_FIFOSIZE)
107 irqmask |= MCI_RXDATAAVLBLMASK;
110 * We don't actually need to include "FIFO empty" here
111 * since its implicit in "FIFO half empty".
113 irqmask = MCI_TXFIFOHALFEMPTYMASK;
116 writel(datactrl, base + MMCIDATACTRL);
117 writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
118 writel(irqmask, base + MMCIMASK1);
122 mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
124 void __iomem *base = host->base;
126 DBG(host, "op %02x arg %08x flags %08x\n",
127 cmd->opcode, cmd->arg, cmd->flags);
129 if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
130 writel(0, base + MMCICOMMAND);
134 c |= cmd->opcode | MCI_CPSM_ENABLE;
135 if (cmd->flags & MMC_RSP_PRESENT) {
136 if (cmd->flags & MMC_RSP_136)
137 c |= MCI_CPSM_LONGRSP;
138 c |= MCI_CPSM_RESPONSE;
141 c |= MCI_CPSM_INTERRUPT;
145 writel(cmd->arg, base + MMCIARGUMENT);
146 writel(c, base + MMCICOMMAND);
150 mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
153 if (status & MCI_DATABLOCKEND) {
154 host->data_xfered += data->blksz;
156 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
157 if (status & MCI_DATACRCFAIL)
158 data->error = MMC_ERR_BADCRC;
159 else if (status & MCI_DATATIMEOUT)
160 data->error = MMC_ERR_TIMEOUT;
161 else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
162 data->error = MMC_ERR_FIFO;
163 status |= MCI_DATAEND;
166 * We hit an error condition. Ensure that any data
167 * partially written to a page is properly coherent.
169 if (host->sg_len && data->flags & MMC_DATA_READ)
170 flush_dcache_page(host->sg_ptr->page);
172 if (status & MCI_DATAEND) {
173 mmci_stop_data(host);
176 mmci_request_end(host, data->mrq);
178 mmci_start_command(host, data->stop, 0);
184 mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
187 void __iomem *base = host->base;
191 cmd->resp[0] = readl(base + MMCIRESPONSE0);
192 cmd->resp[1] = readl(base + MMCIRESPONSE1);
193 cmd->resp[2] = readl(base + MMCIRESPONSE2);
194 cmd->resp[3] = readl(base + MMCIRESPONSE3);
196 if (status & MCI_CMDTIMEOUT) {
197 cmd->error = MMC_ERR_TIMEOUT;
198 } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
199 cmd->error = MMC_ERR_BADCRC;
202 if (!cmd->data || cmd->error != MMC_ERR_NONE) {
204 mmci_stop_data(host);
205 mmci_request_end(host, cmd->mrq);
206 } else if (!(cmd->data->flags & MMC_DATA_READ)) {
207 mmci_start_data(host, cmd->data);
211 static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
213 void __iomem *base = host->base;
218 int count = host->size - (readl(base + MMCIFIFOCNT) << 2);
226 readsl(base + MMCIFIFO, ptr, count >> 2);
234 status = readl(base + MMCISTATUS);
235 } while (status & MCI_RXDATAAVLBL);
240 static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
242 void __iomem *base = host->base;
246 unsigned int count, maxcnt;
248 maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
249 count = min(remain, maxcnt);
251 writesl(base + MMCIFIFO, ptr, count >> 2);
259 status = readl(base + MMCISTATUS);
260 } while (status & MCI_TXFIFOHALFEMPTY);
266 * PIO data transfer IRQ handler.
268 static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
270 struct mmci_host *host = dev_id;
271 void __iomem *base = host->base;
274 status = readl(base + MMCISTATUS);
276 DBG(host, "irq1 %08x\n", status);
280 unsigned int remain, len;
284 * For write, we only need to test the half-empty flag
285 * here - if the FIFO is completely empty, then by
286 * definition it is more than half empty.
288 * For read, check for data available.
290 if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
294 * Map the current scatter buffer.
296 buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
297 remain = host->sg_ptr->length - host->sg_off;
300 if (status & MCI_RXACTIVE)
301 len = mmci_pio_read(host, buffer, remain);
302 if (status & MCI_TXACTIVE)
303 len = mmci_pio_write(host, buffer, remain, status);
308 mmci_kunmap_atomic(host, buffer, &flags);
318 * If we were reading, and we have completed this
319 * page, ensure that the data cache is coherent.
321 if (status & MCI_RXACTIVE)
322 flush_dcache_page(host->sg_ptr->page);
324 if (!mmci_next_sg(host))
327 status = readl(base + MMCISTATUS);
331 * If we're nearing the end of the read, switch to
332 * "any data available" mode.
334 if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
335 writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
338 * If we run out of data, disable the data IRQs; this
339 * prevents a race where the FIFO becomes empty before
340 * the chip itself has disabled the data path, and
341 * stops us racing with our data end IRQ.
343 if (host->size == 0) {
344 writel(0, base + MMCIMASK1);
345 writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
352 * Handle completion of command and data transfers.
354 static irqreturn_t mmci_irq(int irq, void *dev_id)
356 struct mmci_host *host = dev_id;
360 spin_lock(&host->lock);
363 struct mmc_command *cmd;
364 struct mmc_data *data;
366 status = readl(host->base + MMCISTATUS);
367 status &= readl(host->base + MMCIMASK0);
368 writel(status, host->base + MMCICLEAR);
370 DBG(host, "irq0 %08x\n", status);
373 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|
374 MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data)
375 mmci_data_irq(host, data, status);
378 if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
379 mmci_cmd_irq(host, cmd, status);
384 spin_unlock(&host->lock);
386 return IRQ_RETVAL(ret);
389 static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
391 struct mmci_host *host = mmc_priv(mmc);
393 WARN_ON(host->mrq != NULL);
395 spin_lock_irq(&host->lock);
399 if (mrq->data && mrq->data->flags & MMC_DATA_READ)
400 mmci_start_data(host, mrq->data);
402 mmci_start_command(host, mrq->cmd, 0);
404 spin_unlock_irq(&host->lock);
407 static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
409 struct mmci_host *host = mmc_priv(mmc);
410 u32 clk = 0, pwr = 0;
413 if (ios->clock >= host->mclk) {
414 clk = MCI_CLK_BYPASS;
415 host->cclk = host->mclk;
417 clk = host->mclk / (2 * ios->clock) - 1;
420 host->cclk = host->mclk / (2 * (clk + 1));
422 clk |= MCI_CLK_ENABLE;
425 if (host->plat->translate_vdd)
426 pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
428 switch (ios->power_mode) {
439 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
442 writel(clk, host->base + MMCICLOCK);
444 if (host->pwr != pwr) {
446 writel(pwr, host->base + MMCIPOWER);
450 static const struct mmc_host_ops mmci_ops = {
451 .request = mmci_request,
452 .set_ios = mmci_set_ios,
455 static void mmci_check_status(unsigned long data)
457 struct mmci_host *host = (struct mmci_host *)data;
460 status = host->plat->status(mmc_dev(host->mmc));
461 if (status ^ host->oldstat)
462 mmc_detect_change(host->mmc, 0);
464 host->oldstat = status;
465 mod_timer(&host->timer, jiffies + HZ);
468 static int mmci_probe(struct amba_device *dev, void *id)
470 struct mmc_platform_data *plat = dev->dev.platform_data;
471 struct mmci_host *host;
472 struct mmc_host *mmc;
475 /* must have platform data */
481 ret = amba_request_regions(dev, DRIVER_NAME);
485 mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
491 host = mmc_priv(mmc);
492 host->clk = clk_get(&dev->dev, "MCLK");
493 if (IS_ERR(host->clk)) {
494 ret = PTR_ERR(host->clk);
499 ret = clk_enable(host->clk);
504 host->mclk = clk_get_rate(host->clk);
506 host->base = ioremap(dev->res.start, SZ_4K);
512 mmc->ops = &mmci_ops;
513 mmc->f_min = (host->mclk + 511) / 512;
514 mmc->f_max = min(host->mclk, fmax);
515 mmc->ocr_avail = plat->ocr_mask;
516 mmc->caps = MMC_CAP_MULTIWRITE;
521 mmc->max_hw_segs = 16;
522 mmc->max_phys_segs = NR_SG;
525 * Since we only have a 16-bit data length register, we must
526 * ensure that we don't exceed 2^16-1 bytes in a single request.
527 * Choose 64 (512-byte) sectors as the limit.
529 mmc->max_sectors = 64;
532 * Set the maximum segment size. Since we aren't doing DMA
533 * (yet) we are only limited by the data length register.
535 mmc->max_seg_size = mmc->max_sectors << 9;
537 spin_lock_init(&host->lock);
539 writel(0, host->base + MMCIMASK0);
540 writel(0, host->base + MMCIMASK1);
541 writel(0xfff, host->base + MMCICLEAR);
543 ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
547 ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
551 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
553 amba_set_drvdata(dev, mmc);
557 printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
558 mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
559 (unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);
561 init_timer(&host->timer);
562 host->timer.data = (unsigned long)host;
563 host->timer.function = mmci_check_status;
564 host->timer.expires = jiffies + HZ;
565 add_timer(&host->timer);
570 free_irq(dev->irq[0], host);
574 clk_disable(host->clk);
580 amba_release_regions(dev);
585 static int mmci_remove(struct amba_device *dev)
587 struct mmc_host *mmc = amba_get_drvdata(dev);
589 amba_set_drvdata(dev, NULL);
592 struct mmci_host *host = mmc_priv(mmc);
594 del_timer_sync(&host->timer);
596 mmc_remove_host(mmc);
598 writel(0, host->base + MMCIMASK0);
599 writel(0, host->base + MMCIMASK1);
601 writel(0, host->base + MMCICOMMAND);
602 writel(0, host->base + MMCIDATACTRL);
604 free_irq(dev->irq[0], host);
605 free_irq(dev->irq[1], host);
608 clk_disable(host->clk);
613 amba_release_regions(dev);
620 static int mmci_suspend(struct amba_device *dev, pm_message_t state)
622 struct mmc_host *mmc = amba_get_drvdata(dev);
626 struct mmci_host *host = mmc_priv(mmc);
628 ret = mmc_suspend_host(mmc, state);
630 writel(0, host->base + MMCIMASK0);
636 static int mmci_resume(struct amba_device *dev)
638 struct mmc_host *mmc = amba_get_drvdata(dev);
642 struct mmci_host *host = mmc_priv(mmc);
644 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
646 ret = mmc_resume_host(mmc);
652 #define mmci_suspend NULL
653 #define mmci_resume NULL
656 static struct amba_id mmci_ids[] = {
668 static struct amba_driver mmci_driver = {
673 .remove = mmci_remove,
674 .suspend = mmci_suspend,
675 .resume = mmci_resume,
676 .id_table = mmci_ids,
679 static int __init mmci_init(void)
681 return amba_driver_register(&mmci_driver);
684 static void __exit mmci_exit(void)
686 amba_driver_unregister(&mmci_driver);
689 module_init(mmci_init);
690 module_exit(mmci_exit);
691 module_param(fmax, uint, 0444);
693 MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
694 MODULE_LICENSE("GPL");