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);
49 mrq->data->bytes_xfered = host->data_xfered;
52 * Need to drop the host lock here; mmc_request_done may call
53 * back into the driver...
55 spin_unlock(&host->lock);
56 mmc_request_done(host->mmc, mrq);
57 spin_lock(&host->lock);
60 static void mmci_stop_data(struct mmci_host *host)
62 writel(0, host->base + MMCIDATACTRL);
63 writel(0, host->base + MMCIMASK1);
67 static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
69 unsigned int datactrl, timeout, irqmask;
70 unsigned long long clks;
73 DBG(host, "blksz %04x blks %04x flags %08x\n",
74 1 << data->blksz_bits, data->blocks, data->flags);
77 host->size = data->blocks << data->blksz_bits;
78 host->data_xfered = 0;
80 mmci_init_sg(host, data);
82 clks = (unsigned long long)data->timeout_ns * host->cclk;
83 do_div(clks, 1000000000UL);
85 timeout = data->timeout_clks + (unsigned int)clks;
88 writel(timeout, base + MMCIDATATIMER);
89 writel(host->size, base + MMCIDATALENGTH);
91 datactrl = MCI_DPSM_ENABLE | data->blksz_bits << 4;
92 if (data->flags & MMC_DATA_READ) {
93 datactrl |= MCI_DPSM_DIRECTION;
94 irqmask = MCI_RXFIFOHALFFULLMASK;
97 * If we have less than a FIFOSIZE of bytes to transfer,
98 * trigger a PIO interrupt as soon as any data is available.
100 if (host->size < MCI_FIFOSIZE)
101 irqmask |= MCI_RXDATAAVLBLMASK;
104 * We don't actually need to include "FIFO empty" here
105 * since its implicit in "FIFO half empty".
107 irqmask = MCI_TXFIFOHALFEMPTYMASK;
110 writel(datactrl, base + MMCIDATACTRL);
111 writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
112 writel(irqmask, base + MMCIMASK1);
116 mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
118 void __iomem *base = host->base;
120 DBG(host, "op %02x arg %08x flags %08x\n",
121 cmd->opcode, cmd->arg, cmd->flags);
123 if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
124 writel(0, base + MMCICOMMAND);
128 c |= cmd->opcode | MCI_CPSM_ENABLE;
129 if (cmd->flags & MMC_RSP_PRESENT) {
130 if (cmd->flags & MMC_RSP_136)
131 c |= MCI_CPSM_LONGRSP;
132 c |= MCI_CPSM_RESPONSE;
135 c |= MCI_CPSM_INTERRUPT;
139 writel(cmd->arg, base + MMCIARGUMENT);
140 writel(c, base + MMCICOMMAND);
144 mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
147 if (status & MCI_DATABLOCKEND) {
148 host->data_xfered += 1 << data->blksz_bits;
150 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
151 if (status & MCI_DATACRCFAIL)
152 data->error = MMC_ERR_BADCRC;
153 else if (status & MCI_DATATIMEOUT)
154 data->error = MMC_ERR_TIMEOUT;
155 else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
156 data->error = MMC_ERR_FIFO;
157 status |= MCI_DATAEND;
160 * We hit an error condition. Ensure that any data
161 * partially written to a page is properly coherent.
163 if (host->sg_len && data->flags & MMC_DATA_READ)
164 flush_dcache_page(host->sg_ptr->page);
166 if (status & MCI_DATAEND) {
167 mmci_stop_data(host);
170 mmci_request_end(host, data->mrq);
172 mmci_start_command(host, data->stop, 0);
178 mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
181 void __iomem *base = host->base;
185 cmd->resp[0] = readl(base + MMCIRESPONSE0);
186 cmd->resp[1] = readl(base + MMCIRESPONSE1);
187 cmd->resp[2] = readl(base + MMCIRESPONSE2);
188 cmd->resp[3] = readl(base + MMCIRESPONSE3);
190 if (status & MCI_CMDTIMEOUT) {
191 cmd->error = MMC_ERR_TIMEOUT;
192 } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
193 cmd->error = MMC_ERR_BADCRC;
196 if (!cmd->data || cmd->error != MMC_ERR_NONE) {
197 mmci_request_end(host, cmd->mrq);
198 } else if (!(cmd->data->flags & MMC_DATA_READ)) {
199 mmci_start_data(host, cmd->data);
203 static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
205 void __iomem *base = host->base;
210 int count = host->size - (readl(base + MMCIFIFOCNT) << 2);
218 readsl(base + MMCIFIFO, ptr, count >> 2);
226 status = readl(base + MMCISTATUS);
227 } while (status & MCI_RXDATAAVLBL);
232 static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
234 void __iomem *base = host->base;
238 unsigned int count, maxcnt;
240 maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
241 count = min(remain, maxcnt);
243 writesl(base + MMCIFIFO, ptr, count >> 2);
251 status = readl(base + MMCISTATUS);
252 } while (status & MCI_TXFIFOHALFEMPTY);
258 * PIO data transfer IRQ handler.
260 static irqreturn_t mmci_pio_irq(int irq, void *dev_id, struct pt_regs *regs)
262 struct mmci_host *host = dev_id;
263 void __iomem *base = host->base;
266 status = readl(base + MMCISTATUS);
268 DBG(host, "irq1 %08x\n", status);
272 unsigned int remain, len;
276 * For write, we only need to test the half-empty flag
277 * here - if the FIFO is completely empty, then by
278 * definition it is more than half empty.
280 * For read, check for data available.
282 if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
286 * Map the current scatter buffer.
288 buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
289 remain = host->sg_ptr->length - host->sg_off;
292 if (status & MCI_RXACTIVE)
293 len = mmci_pio_read(host, buffer, remain);
294 if (status & MCI_TXACTIVE)
295 len = mmci_pio_write(host, buffer, remain, status);
300 mmci_kunmap_atomic(host, buffer, &flags);
310 * If we were reading, and we have completed this
311 * page, ensure that the data cache is coherent.
313 if (status & MCI_RXACTIVE)
314 flush_dcache_page(host->sg_ptr->page);
316 if (!mmci_next_sg(host))
319 status = readl(base + MMCISTATUS);
323 * If we're nearing the end of the read, switch to
324 * "any data available" mode.
326 if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
327 writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
330 * If we run out of data, disable the data IRQs; this
331 * prevents a race where the FIFO becomes empty before
332 * the chip itself has disabled the data path, and
333 * stops us racing with our data end IRQ.
335 if (host->size == 0) {
336 writel(0, base + MMCIMASK1);
337 writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
344 * Handle completion of command and data transfers.
346 static irqreturn_t mmci_irq(int irq, void *dev_id, struct pt_regs *regs)
348 struct mmci_host *host = dev_id;
352 spin_lock(&host->lock);
355 struct mmc_command *cmd;
356 struct mmc_data *data;
358 status = readl(host->base + MMCISTATUS);
359 status &= readl(host->base + MMCIMASK0);
360 writel(status, host->base + MMCICLEAR);
362 DBG(host, "irq0 %08x\n", status);
365 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|
366 MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data)
367 mmci_data_irq(host, data, status);
370 if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
371 mmci_cmd_irq(host, cmd, status);
376 spin_unlock(&host->lock);
378 return IRQ_RETVAL(ret);
381 static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
383 struct mmci_host *host = mmc_priv(mmc);
385 WARN_ON(host->mrq != NULL);
387 spin_lock_irq(&host->lock);
391 if (mrq->data && mrq->data->flags & MMC_DATA_READ)
392 mmci_start_data(host, mrq->data);
394 mmci_start_command(host, mrq->cmd, 0);
396 spin_unlock_irq(&host->lock);
399 static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
401 struct mmci_host *host = mmc_priv(mmc);
402 u32 clk = 0, pwr = 0;
405 if (ios->clock >= host->mclk) {
406 clk = MCI_CLK_BYPASS;
407 host->cclk = host->mclk;
409 clk = host->mclk / (2 * ios->clock) - 1;
412 host->cclk = host->mclk / (2 * (clk + 1));
414 clk |= MCI_CLK_ENABLE;
417 if (host->plat->translate_vdd)
418 pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
420 switch (ios->power_mode) {
431 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
434 writel(clk, host->base + MMCICLOCK);
436 if (host->pwr != pwr) {
438 writel(pwr, host->base + MMCIPOWER);
442 static struct mmc_host_ops mmci_ops = {
443 .request = mmci_request,
444 .set_ios = mmci_set_ios,
447 static void mmci_check_status(unsigned long data)
449 struct mmci_host *host = (struct mmci_host *)data;
452 status = host->plat->status(mmc_dev(host->mmc));
453 if (status ^ host->oldstat)
454 mmc_detect_change(host->mmc, 0);
456 host->oldstat = status;
457 mod_timer(&host->timer, jiffies + HZ);
460 static int mmci_probe(struct amba_device *dev, void *id)
462 struct mmc_platform_data *plat = dev->dev.platform_data;
463 struct mmci_host *host;
464 struct mmc_host *mmc;
467 /* must have platform data */
473 ret = amba_request_regions(dev, DRIVER_NAME);
477 mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
483 host = mmc_priv(mmc);
484 host->clk = clk_get(&dev->dev, "MCLK");
485 if (IS_ERR(host->clk)) {
486 ret = PTR_ERR(host->clk);
491 ret = clk_enable(host->clk);
496 host->mclk = clk_get_rate(host->clk);
498 host->base = ioremap(dev->res.start, SZ_4K);
504 mmc->ops = &mmci_ops;
505 mmc->f_min = (host->mclk + 511) / 512;
506 mmc->f_max = min(host->mclk, fmax);
507 mmc->ocr_avail = plat->ocr_mask;
512 mmc->max_hw_segs = 16;
513 mmc->max_phys_segs = NR_SG;
516 * Since we only have a 16-bit data length register, we must
517 * ensure that we don't exceed 2^16-1 bytes in a single request.
518 * Choose 64 (512-byte) sectors as the limit.
520 mmc->max_sectors = 64;
523 * Set the maximum segment size. Since we aren't doing DMA
524 * (yet) we are only limited by the data length register.
526 mmc->max_seg_size = mmc->max_sectors << 9;
528 spin_lock_init(&host->lock);
530 writel(0, host->base + MMCIMASK0);
531 writel(0, host->base + MMCIMASK1);
532 writel(0xfff, host->base + MMCICLEAR);
534 ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
538 ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
542 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
544 amba_set_drvdata(dev, mmc);
548 printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
549 mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
550 (unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);
552 init_timer(&host->timer);
553 host->timer.data = (unsigned long)host;
554 host->timer.function = mmci_check_status;
555 host->timer.expires = jiffies + HZ;
556 add_timer(&host->timer);
561 free_irq(dev->irq[0], host);
565 clk_disable(host->clk);
571 amba_release_regions(dev);
576 static int mmci_remove(struct amba_device *dev)
578 struct mmc_host *mmc = amba_get_drvdata(dev);
580 amba_set_drvdata(dev, NULL);
583 struct mmci_host *host = mmc_priv(mmc);
585 del_timer_sync(&host->timer);
587 mmc_remove_host(mmc);
589 writel(0, host->base + MMCIMASK0);
590 writel(0, host->base + MMCIMASK1);
592 writel(0, host->base + MMCICOMMAND);
593 writel(0, host->base + MMCIDATACTRL);
595 free_irq(dev->irq[0], host);
596 free_irq(dev->irq[1], host);
599 clk_disable(host->clk);
604 amba_release_regions(dev);
611 static int mmci_suspend(struct amba_device *dev, pm_message_t state)
613 struct mmc_host *mmc = amba_get_drvdata(dev);
617 struct mmci_host *host = mmc_priv(mmc);
619 ret = mmc_suspend_host(mmc, state);
621 writel(0, host->base + MMCIMASK0);
627 static int mmci_resume(struct amba_device *dev)
629 struct mmc_host *mmc = amba_get_drvdata(dev);
633 struct mmci_host *host = mmc_priv(mmc);
635 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
637 ret = mmc_resume_host(mmc);
643 #define mmci_suspend NULL
644 #define mmci_resume NULL
647 static struct amba_id mmci_ids[] = {
659 static struct amba_driver mmci_driver = {
664 .remove = mmci_remove,
665 .suspend = mmci_suspend,
666 .resume = mmci_resume,
667 .id_table = mmci_ids,
670 static int __init mmci_init(void)
672 return amba_driver_register(&mmci_driver);
675 static void __exit mmci_exit(void)
677 amba_driver_unregister(&mmci_driver);
680 module_init(mmci_init);
681 module_exit(mmci_exit);
682 module_param(fmax, uint, 0444);
684 MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
685 MODULE_LICENSE("GPL");