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/config.h>
11 #include <linux/module.h>
12 #include <linux/moduleparam.h>
13 #include <linux/init.h>
14 #include <linux/ioport.h>
15 #include <linux/device.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/err.h>
19 #include <linux/highmem.h>
20 #include <linux/mmc/host.h>
21 #include <linux/mmc/protocol.h>
22 #include <linux/amba/bus.h>
23 #include <linux/clk.h>
25 #include <asm/cacheflush.h>
26 #include <asm/div64.h>
28 #include <asm/scatterlist.h>
29 #include <asm/sizes.h>
30 #include <asm/mach/mmc.h>
34 #define DRIVER_NAME "mmci-pl18x"
36 #ifdef CONFIG_MMC_DEBUG
37 #define DBG(host,fmt,args...) \
38 pr_debug("%s: %s: " fmt, mmc_hostname(host->mmc), __func__ , args)
40 #define DBG(host,fmt,args...) do { } while (0)
43 static unsigned int fmax = 515633;
46 mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
48 writel(0, host->base + MMCICOMMAND);
54 mrq->data->bytes_xfered = host->data_xfered;
57 * Need to drop the host lock here; mmc_request_done may call
58 * back into the driver...
60 spin_unlock(&host->lock);
61 mmc_request_done(host->mmc, mrq);
62 spin_lock(&host->lock);
65 static void mmci_stop_data(struct mmci_host *host)
67 writel(0, host->base + MMCIDATACTRL);
68 writel(0, host->base + MMCIMASK1);
72 static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
74 unsigned int datactrl, timeout, irqmask;
75 unsigned long long clks;
78 DBG(host, "blksz %04x blks %04x flags %08x\n",
79 1 << data->blksz_bits, data->blocks, data->flags);
82 host->size = data->blocks << data->blksz_bits;
83 host->data_xfered = 0;
85 mmci_init_sg(host, data);
87 clks = (unsigned long long)data->timeout_ns * host->cclk;
88 do_div(clks, 1000000000UL);
90 timeout = data->timeout_clks + (unsigned int)clks;
93 writel(timeout, base + MMCIDATATIMER);
94 writel(host->size, base + MMCIDATALENGTH);
96 datactrl = MCI_DPSM_ENABLE | data->blksz_bits << 4;
97 if (data->flags & MMC_DATA_READ) {
98 datactrl |= MCI_DPSM_DIRECTION;
99 irqmask = MCI_RXFIFOHALFFULLMASK;
102 * If we have less than a FIFOSIZE of bytes to transfer,
103 * trigger a PIO interrupt as soon as any data is available.
105 if (host->size < MCI_FIFOSIZE)
106 irqmask |= MCI_RXDATAAVLBLMASK;
109 * We don't actually need to include "FIFO empty" here
110 * since its implicit in "FIFO half empty".
112 irqmask = MCI_TXFIFOHALFEMPTYMASK;
115 writel(datactrl, base + MMCIDATACTRL);
116 writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
117 writel(irqmask, base + MMCIMASK1);
121 mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
123 void __iomem *base = host->base;
125 DBG(host, "op %02x arg %08x flags %08x\n",
126 cmd->opcode, cmd->arg, cmd->flags);
128 if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
129 writel(0, base + MMCICOMMAND);
133 c |= cmd->opcode | MCI_CPSM_ENABLE;
134 if (cmd->flags & MMC_RSP_PRESENT) {
135 if (cmd->flags & MMC_RSP_136)
136 c |= MCI_CPSM_LONGRSP;
137 c |= MCI_CPSM_RESPONSE;
140 c |= MCI_CPSM_INTERRUPT;
144 writel(cmd->arg, base + MMCIARGUMENT);
145 writel(c, base + MMCICOMMAND);
149 mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
152 if (status & MCI_DATABLOCKEND) {
153 host->data_xfered += 1 << data->blksz_bits;
155 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
156 if (status & MCI_DATACRCFAIL)
157 data->error = MMC_ERR_BADCRC;
158 else if (status & MCI_DATATIMEOUT)
159 data->error = MMC_ERR_TIMEOUT;
160 else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
161 data->error = MMC_ERR_FIFO;
162 status |= MCI_DATAEND;
165 * We hit an error condition. Ensure that any data
166 * partially written to a page is properly coherent.
168 if (host->sg_len && data->flags & MMC_DATA_READ)
169 flush_dcache_page(host->sg_ptr->page);
171 if (status & MCI_DATAEND) {
172 mmci_stop_data(host);
175 mmci_request_end(host, data->mrq);
177 mmci_start_command(host, data->stop, 0);
183 mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
186 void __iomem *base = host->base;
190 cmd->resp[0] = readl(base + MMCIRESPONSE0);
191 cmd->resp[1] = readl(base + MMCIRESPONSE1);
192 cmd->resp[2] = readl(base + MMCIRESPONSE2);
193 cmd->resp[3] = readl(base + MMCIRESPONSE3);
195 if (status & MCI_CMDTIMEOUT) {
196 cmd->error = MMC_ERR_TIMEOUT;
197 } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
198 cmd->error = MMC_ERR_BADCRC;
201 if (!cmd->data || cmd->error != MMC_ERR_NONE) {
202 mmci_request_end(host, cmd->mrq);
203 } else if (!(cmd->data->flags & MMC_DATA_READ)) {
204 mmci_start_data(host, cmd->data);
208 static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
210 void __iomem *base = host->base;
215 int count = host->size - (readl(base + MMCIFIFOCNT) << 2);
223 readsl(base + MMCIFIFO, ptr, count >> 2);
231 status = readl(base + MMCISTATUS);
232 } while (status & MCI_RXDATAAVLBL);
237 static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
239 void __iomem *base = host->base;
243 unsigned int count, maxcnt;
245 maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
246 count = min(remain, maxcnt);
248 writesl(base + MMCIFIFO, ptr, count >> 2);
256 status = readl(base + MMCISTATUS);
257 } while (status & MCI_TXFIFOHALFEMPTY);
263 * PIO data transfer IRQ handler.
265 static irqreturn_t mmci_pio_irq(int irq, void *dev_id, struct pt_regs *regs)
267 struct mmci_host *host = dev_id;
268 void __iomem *base = host->base;
271 status = readl(base + MMCISTATUS);
273 DBG(host, "irq1 %08x\n", status);
277 unsigned int remain, len;
281 * For write, we only need to test the half-empty flag
282 * here - if the FIFO is completely empty, then by
283 * definition it is more than half empty.
285 * For read, check for data available.
287 if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
291 * Map the current scatter buffer.
293 buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
294 remain = host->sg_ptr->length - host->sg_off;
297 if (status & MCI_RXACTIVE)
298 len = mmci_pio_read(host, buffer, remain);
299 if (status & MCI_TXACTIVE)
300 len = mmci_pio_write(host, buffer, remain, status);
305 mmci_kunmap_atomic(host, buffer, &flags);
315 * If we were reading, and we have completed this
316 * page, ensure that the data cache is coherent.
318 if (status & MCI_RXACTIVE)
319 flush_dcache_page(host->sg_ptr->page);
321 if (!mmci_next_sg(host))
324 status = readl(base + MMCISTATUS);
328 * If we're nearing the end of the read, switch to
329 * "any data available" mode.
331 if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
332 writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
335 * If we run out of data, disable the data IRQs; this
336 * prevents a race where the FIFO becomes empty before
337 * the chip itself has disabled the data path, and
338 * stops us racing with our data end IRQ.
340 if (host->size == 0) {
341 writel(0, base + MMCIMASK1);
342 writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
349 * Handle completion of command and data transfers.
351 static irqreturn_t mmci_irq(int irq, void *dev_id, struct pt_regs *regs)
353 struct mmci_host *host = dev_id;
357 spin_lock(&host->lock);
360 struct mmc_command *cmd;
361 struct mmc_data *data;
363 status = readl(host->base + MMCISTATUS);
364 status &= readl(host->base + MMCIMASK0);
365 writel(status, host->base + MMCICLEAR);
367 DBG(host, "irq0 %08x\n", status);
370 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|
371 MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data)
372 mmci_data_irq(host, data, status);
375 if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
376 mmci_cmd_irq(host, cmd, status);
381 spin_unlock(&host->lock);
383 return IRQ_RETVAL(ret);
386 static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
388 struct mmci_host *host = mmc_priv(mmc);
390 WARN_ON(host->mrq != NULL);
392 spin_lock_irq(&host->lock);
396 if (mrq->data && mrq->data->flags & MMC_DATA_READ)
397 mmci_start_data(host, mrq->data);
399 mmci_start_command(host, mrq->cmd, 0);
401 spin_unlock_irq(&host->lock);
404 static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
406 struct mmci_host *host = mmc_priv(mmc);
407 u32 clk = 0, pwr = 0;
409 DBG(host, "clock %uHz busmode %u powermode %u Vdd %u\n",
410 ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
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 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;
520 mmc->max_hw_segs = 16;
521 mmc->max_phys_segs = NR_SG;
524 * Since we only have a 16-bit data length register, we must
525 * ensure that we don't exceed 2^16-1 bytes in a single request.
526 * Choose 64 (512-byte) sectors as the limit.
528 mmc->max_sectors = 64;
531 * Set the maximum segment size. Since we aren't doing DMA
532 * (yet) we are only limited by the data length register.
534 mmc->max_seg_size = mmc->max_sectors << 9;
536 spin_lock_init(&host->lock);
538 writel(0, host->base + MMCIMASK0);
539 writel(0, host->base + MMCIMASK1);
540 writel(0xfff, host->base + MMCICLEAR);
542 ret = request_irq(dev->irq[0], mmci_irq, SA_SHIRQ, DRIVER_NAME " (cmd)", host);
546 ret = request_irq(dev->irq[1], mmci_pio_irq, SA_SHIRQ, DRIVER_NAME " (pio)", host);
550 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
552 amba_set_drvdata(dev, mmc);
556 printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%08lx irq %d,%d\n",
557 mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
558 dev->res.start, dev->irq[0], dev->irq[1]);
560 init_timer(&host->timer);
561 host->timer.data = (unsigned long)host;
562 host->timer.function = mmci_check_status;
563 host->timer.expires = jiffies + HZ;
564 add_timer(&host->timer);
569 free_irq(dev->irq[0], host);
573 clk_disable(host->clk);
579 amba_release_regions(dev);
584 static int mmci_remove(struct amba_device *dev)
586 struct mmc_host *mmc = amba_get_drvdata(dev);
588 amba_set_drvdata(dev, NULL);
591 struct mmci_host *host = mmc_priv(mmc);
593 del_timer_sync(&host->timer);
595 mmc_remove_host(mmc);
597 writel(0, host->base + MMCIMASK0);
598 writel(0, host->base + MMCIMASK1);
600 writel(0, host->base + MMCICOMMAND);
601 writel(0, host->base + MMCIDATACTRL);
603 free_irq(dev->irq[0], host);
604 free_irq(dev->irq[1], host);
607 clk_disable(host->clk);
612 amba_release_regions(dev);
619 static int mmci_suspend(struct amba_device *dev, pm_message_t state)
621 struct mmc_host *mmc = amba_get_drvdata(dev);
625 struct mmci_host *host = mmc_priv(mmc);
627 ret = mmc_suspend_host(mmc, state);
629 writel(0, host->base + MMCIMASK0);
635 static int mmci_resume(struct amba_device *dev)
637 struct mmc_host *mmc = amba_get_drvdata(dev);
641 struct mmci_host *host = mmc_priv(mmc);
643 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
645 ret = mmc_resume_host(mmc);
651 #define mmci_suspend NULL
652 #define mmci_resume NULL
655 static struct amba_id mmci_ids[] = {
667 static struct amba_driver mmci_driver = {
672 .remove = mmci_remove,
673 .suspend = mmci_suspend,
674 .resume = mmci_resume,
675 .id_table = mmci_ids,
678 static int __init mmci_init(void)
680 return amba_driver_register(&mmci_driver);
683 static void __exit mmci_exit(void)
685 amba_driver_unregister(&mmci_driver);
688 module_init(mmci_init);
689 module_exit(mmci_exit);
690 module_param(fmax, uint, 0444);
692 MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
693 MODULE_LICENSE("GPL");