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>
23 #include <asm/div64.h>
26 #include <asm/scatterlist.h>
27 #include <asm/sizes.h>
28 #include <asm/hardware/amba.h>
29 #include <asm/hardware/clock.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 * We don't actually need to include "FIFO empty" here
103 * since its implicit in "FIFO half empty".
105 irqmask = MCI_TXFIFOHALFEMPTYMASK;
108 writel(datactrl, base + MMCIDATACTRL);
109 writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
110 writel(irqmask, base + MMCIMASK1);
114 mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
116 void __iomem *base = host->base;
118 DBG(host, "op %02x arg %08x flags %08x\n",
119 cmd->opcode, cmd->arg, cmd->flags);
121 if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
122 writel(0, base + MMCICOMMAND);
126 c |= cmd->opcode | MCI_CPSM_ENABLE;
127 switch (cmd->flags & MMC_RSP_MASK) {
132 c |= MCI_CPSM_LONGRSP;
134 c |= MCI_CPSM_RESPONSE;
138 c |= MCI_CPSM_INTERRUPT;
142 writel(cmd->arg, base + MMCIARGUMENT);
143 writel(c, base + MMCICOMMAND);
147 mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
150 if (status & MCI_DATABLOCKEND) {
151 host->data_xfered += 1 << data->blksz_bits;
153 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
154 if (status & MCI_DATACRCFAIL)
155 data->error = MMC_ERR_BADCRC;
156 else if (status & MCI_DATATIMEOUT)
157 data->error = MMC_ERR_TIMEOUT;
158 else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
159 data->error = MMC_ERR_FIFO;
160 status |= MCI_DATAEND;
162 if (status & MCI_DATAEND) {
163 mmci_stop_data(host);
166 mmci_request_end(host, data->mrq);
168 mmci_start_command(host, data->stop, 0);
174 mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
177 void __iomem *base = host->base;
181 cmd->resp[0] = readl(base + MMCIRESPONSE0);
182 cmd->resp[1] = readl(base + MMCIRESPONSE1);
183 cmd->resp[2] = readl(base + MMCIRESPONSE2);
184 cmd->resp[3] = readl(base + MMCIRESPONSE3);
186 if (status & MCI_CMDTIMEOUT) {
187 cmd->error = MMC_ERR_TIMEOUT;
188 } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
189 cmd->error = MMC_ERR_BADCRC;
192 if (!cmd->data || cmd->error != MMC_ERR_NONE) {
193 mmci_request_end(host, cmd->mrq);
194 } else if (!(cmd->data->flags & MMC_DATA_READ)) {
195 mmci_start_data(host, cmd->data);
199 static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
201 void __iomem *base = host->base;
206 int count = host->size - (readl(base + MMCIFIFOCNT) << 2);
214 readsl(base + MMCIFIFO, ptr, count >> 2);
222 status = readl(base + MMCISTATUS);
223 } while (status & MCI_RXDATAAVLBL);
228 static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
230 void __iomem *base = host->base;
234 unsigned int count, maxcnt;
236 maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
237 count = min(remain, maxcnt);
239 writesl(base + MMCIFIFO, ptr, count >> 2);
247 status = readl(base + MMCISTATUS);
248 } while (status & MCI_TXFIFOHALFEMPTY);
254 * PIO data transfer IRQ handler.
256 static irqreturn_t mmci_pio_irq(int irq, void *dev_id, struct pt_regs *regs)
258 struct mmci_host *host = dev_id;
259 void __iomem *base = host->base;
262 status = readl(base + MMCISTATUS);
264 DBG(host, "irq1 %08x\n", status);
268 unsigned int remain, len;
272 * For write, we only need to test the half-empty flag
273 * here - if the FIFO is completely empty, then by
274 * definition it is more than half empty.
276 * For read, check for data available.
278 if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
282 * Map the current scatter buffer.
284 buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
285 remain = host->sg_ptr->length - host->sg_off;
288 if (status & MCI_RXACTIVE)
289 len = mmci_pio_read(host, buffer, remain);
290 if (status & MCI_TXACTIVE)
291 len = mmci_pio_write(host, buffer, remain, status);
296 mmci_kunmap_atomic(host, &flags);
305 if (!mmci_next_sg(host))
308 status = readl(base + MMCISTATUS);
312 * If we're nearing the end of the read, switch to
313 * "any data available" mode.
315 if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
316 writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
319 * If we run out of data, disable the data IRQs; this
320 * prevents a race where the FIFO becomes empty before
321 * the chip itself has disabled the data path, and
322 * stops us racing with our data end IRQ.
324 if (host->size == 0) {
325 writel(0, base + MMCIMASK1);
326 writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
333 * Handle completion of command and data transfers.
335 static irqreturn_t mmci_irq(int irq, void *dev_id, struct pt_regs *regs)
337 struct mmci_host *host = dev_id;
341 spin_lock(&host->lock);
344 struct mmc_command *cmd;
345 struct mmc_data *data;
347 status = readl(host->base + MMCISTATUS);
348 status &= readl(host->base + MMCIMASK0);
349 writel(status, host->base + MMCICLEAR);
351 DBG(host, "irq0 %08x\n", status);
354 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|
355 MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data)
356 mmci_data_irq(host, data, status);
359 if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
360 mmci_cmd_irq(host, cmd, status);
365 spin_unlock(&host->lock);
367 return IRQ_RETVAL(ret);
370 static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
372 struct mmci_host *host = mmc_priv(mmc);
374 WARN_ON(host->mrq != NULL);
376 spin_lock_irq(&host->lock);
380 if (mrq->data && mrq->data->flags & MMC_DATA_READ)
381 mmci_start_data(host, mrq->data);
383 mmci_start_command(host, mrq->cmd, 0);
385 spin_unlock_irq(&host->lock);
388 static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
390 struct mmci_host *host = mmc_priv(mmc);
391 u32 clk = 0, pwr = 0;
393 DBG(host, "clock %uHz busmode %u powermode %u Vdd %u\n",
394 ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
397 if (ios->clock >= host->mclk) {
398 clk = MCI_CLK_BYPASS;
399 host->cclk = host->mclk;
401 clk = host->mclk / (2 * ios->clock) - 1;
404 host->cclk = host->mclk / (2 * (clk + 1));
406 clk |= MCI_CLK_ENABLE;
409 if (host->plat->translate_vdd)
410 pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
412 switch (ios->power_mode) {
423 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
426 writel(clk, host->base + MMCICLOCK);
428 if (host->pwr != pwr) {
430 writel(pwr, host->base + MMCIPOWER);
434 static struct mmc_host_ops mmci_ops = {
435 .request = mmci_request,
436 .set_ios = mmci_set_ios,
439 static void mmci_check_status(unsigned long data)
441 struct mmci_host *host = (struct mmci_host *)data;
444 status = host->plat->status(mmc_dev(host->mmc));
445 if (status ^ host->oldstat)
446 mmc_detect_change(host->mmc, 0);
448 host->oldstat = status;
449 mod_timer(&host->timer, jiffies + HZ);
452 static int mmci_probe(struct amba_device *dev, void *id)
454 struct mmc_platform_data *plat = dev->dev.platform_data;
455 struct mmci_host *host;
456 struct mmc_host *mmc;
459 /* must have platform data */
465 ret = amba_request_regions(dev, DRIVER_NAME);
469 mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
475 host = mmc_priv(mmc);
476 host->clk = clk_get(&dev->dev, "MCLK");
477 if (IS_ERR(host->clk)) {
478 ret = PTR_ERR(host->clk);
483 ret = clk_use(host->clk);
487 ret = clk_enable(host->clk);
492 host->mclk = clk_get_rate(host->clk);
494 host->base = ioremap(dev->res.start, SZ_4K);
500 mmc->ops = &mmci_ops;
501 mmc->f_min = (host->mclk + 511) / 512;
502 mmc->f_max = min(host->mclk, fmax);
503 mmc->ocr_avail = plat->ocr_mask;
508 mmc->max_hw_segs = 16;
509 mmc->max_phys_segs = NR_SG;
512 * Since we only have a 16-bit data length register, we must
513 * ensure that we don't exceed 2^16-1 bytes in a single request.
514 * Choose 64 (512-byte) sectors as the limit.
516 mmc->max_sectors = 64;
519 * Set the maximum segment size. Since we aren't doing DMA
520 * (yet) we are only limited by the data length register.
522 mmc->max_seg_size = mmc->max_sectors << 9;
524 spin_lock_init(&host->lock);
526 writel(0, host->base + MMCIMASK0);
527 writel(0, host->base + MMCIMASK1);
528 writel(0xfff, host->base + MMCICLEAR);
530 ret = request_irq(dev->irq[0], mmci_irq, SA_SHIRQ, DRIVER_NAME " (cmd)", host);
534 ret = request_irq(dev->irq[1], mmci_pio_irq, SA_SHIRQ, DRIVER_NAME " (pio)", host);
538 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
540 amba_set_drvdata(dev, mmc);
544 printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%08lx irq %d,%d\n",
545 mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
546 dev->res.start, dev->irq[0], dev->irq[1]);
548 init_timer(&host->timer);
549 host->timer.data = (unsigned long)host;
550 host->timer.function = mmci_check_status;
551 host->timer.expires = jiffies + HZ;
552 add_timer(&host->timer);
557 free_irq(dev->irq[0], host);
561 clk_disable(host->clk);
563 clk_unuse(host->clk);
569 amba_release_regions(dev);
574 static int mmci_remove(struct amba_device *dev)
576 struct mmc_host *mmc = amba_get_drvdata(dev);
578 amba_set_drvdata(dev, NULL);
581 struct mmci_host *host = mmc_priv(mmc);
583 del_timer_sync(&host->timer);
585 mmc_remove_host(mmc);
587 writel(0, host->base + MMCIMASK0);
588 writel(0, host->base + MMCIMASK1);
590 writel(0, host->base + MMCICOMMAND);
591 writel(0, host->base + MMCIDATACTRL);
593 free_irq(dev->irq[0], host);
594 free_irq(dev->irq[1], host);
597 clk_disable(host->clk);
598 clk_unuse(host->clk);
603 amba_release_regions(dev);
610 static int mmci_suspend(struct amba_device *dev, pm_message_t state)
612 struct mmc_host *mmc = amba_get_drvdata(dev);
616 struct mmci_host *host = mmc_priv(mmc);
618 ret = mmc_suspend_host(mmc, state);
620 writel(0, host->base + MMCIMASK0);
626 static int mmci_resume(struct amba_device *dev)
628 struct mmc_host *mmc = amba_get_drvdata(dev);
632 struct mmci_host *host = mmc_priv(mmc);
634 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
636 ret = mmc_resume_host(mmc);
642 #define mmci_suspend NULL
643 #define mmci_resume NULL
646 static struct amba_id mmci_ids[] = {
658 static struct amba_driver mmci_driver = {
663 .remove = mmci_remove,
664 .suspend = mmci_suspend,
665 .resume = mmci_resume,
666 .id_table = mmci_ids,
669 static int __init mmci_init(void)
671 return amba_driver_register(&mmci_driver);
674 static void __exit mmci_exit(void)
676 amba_driver_unregister(&mmci_driver);
679 module_init(mmci_init);
680 module_exit(mmci_exit);
681 module_param(fmax, uint, 0444);
683 MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
684 MODULE_LICENSE("GPL");