2 * linux/drivers/mmc/host/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/log2.h>
20 #include <linux/mmc/host.h>
21 #include <linux/amba/bus.h>
22 #include <linux/clk.h>
23 #include <linux/scatterlist.h>
25 #include <asm/cacheflush.h>
26 #include <asm/div64.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 = -EILSEQ;
159 else if (status & MCI_DATATIMEOUT)
160 data->error = -ETIMEDOUT;
161 else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
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(sg_page(host->sg_ptr));
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 = -ETIMEDOUT;
198 } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
199 cmd->error = -EILSEQ;
202 if (!cmd->data || cmd->error) {
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;
216 int host_remain = host->size;
219 int count = host_remain - (readl(base + MMCIFIFOCNT) << 2);
227 readsl(base + MMCIFIFO, ptr, count >> 2);
231 host_remain -= count;
236 status = readl(base + MMCISTATUS);
237 } while (status & MCI_RXDATAAVLBL);
242 static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
244 void __iomem *base = host->base;
248 unsigned int count, maxcnt;
250 maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
251 count = min(remain, maxcnt);
253 writesl(base + MMCIFIFO, ptr, count >> 2);
261 status = readl(base + MMCISTATUS);
262 } while (status & MCI_TXFIFOHALFEMPTY);
268 * PIO data transfer IRQ handler.
270 static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
272 struct mmci_host *host = dev_id;
273 void __iomem *base = host->base;
276 status = readl(base + MMCISTATUS);
278 DBG(host, "irq1 %08x\n", status);
282 unsigned int remain, len;
286 * For write, we only need to test the half-empty flag
287 * here - if the FIFO is completely empty, then by
288 * definition it is more than half empty.
290 * For read, check for data available.
292 if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
296 * Map the current scatter buffer.
298 buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
299 remain = host->sg_ptr->length - host->sg_off;
302 if (status & MCI_RXACTIVE)
303 len = mmci_pio_read(host, buffer, remain);
304 if (status & MCI_TXACTIVE)
305 len = mmci_pio_write(host, buffer, remain, status);
310 mmci_kunmap_atomic(host, buffer, &flags);
320 * If we were reading, and we have completed this
321 * page, ensure that the data cache is coherent.
323 if (status & MCI_RXACTIVE)
324 flush_dcache_page(sg_page(host->sg_ptr));
326 if (!mmci_next_sg(host))
329 status = readl(base + MMCISTATUS);
333 * If we're nearing the end of the read, switch to
334 * "any data available" mode.
336 if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
337 writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
340 * If we run out of data, disable the data IRQs; this
341 * prevents a race where the FIFO becomes empty before
342 * the chip itself has disabled the data path, and
343 * stops us racing with our data end IRQ.
345 if (host->size == 0) {
346 writel(0, base + MMCIMASK1);
347 writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
354 * Handle completion of command and data transfers.
356 static irqreturn_t mmci_irq(int irq, void *dev_id)
358 struct mmci_host *host = dev_id;
362 spin_lock(&host->lock);
365 struct mmc_command *cmd;
366 struct mmc_data *data;
368 status = readl(host->base + MMCISTATUS);
369 status &= readl(host->base + MMCIMASK0);
370 writel(status, host->base + MMCICLEAR);
372 DBG(host, "irq0 %08x\n", status);
375 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|
376 MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data)
377 mmci_data_irq(host, data, status);
380 if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
381 mmci_cmd_irq(host, cmd, status);
386 spin_unlock(&host->lock);
388 return IRQ_RETVAL(ret);
391 static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
393 struct mmci_host *host = mmc_priv(mmc);
396 WARN_ON(host->mrq != NULL);
398 if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
399 printk(KERN_ERR "%s: Unsupported block size (%d bytes)\n",
400 mmc_hostname(mmc), mrq->data->blksz);
401 mrq->cmd->error = -EINVAL;
402 mmc_request_done(mmc, mrq);
406 spin_lock_irqsave(&host->lock, flags);
410 if (mrq->data && mrq->data->flags & MMC_DATA_READ)
411 mmci_start_data(host, mrq->data);
413 mmci_start_command(host, mrq->cmd, 0);
415 spin_unlock_irqrestore(&host->lock, flags);
418 static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
420 struct mmci_host *host = mmc_priv(mmc);
421 u32 clk = 0, pwr = 0;
424 if (ios->clock >= host->mclk) {
425 clk = MCI_CLK_BYPASS;
426 host->cclk = host->mclk;
428 clk = host->mclk / (2 * ios->clock) - 1;
431 host->cclk = host->mclk / (2 * (clk + 1));
433 clk |= MCI_CLK_ENABLE;
436 if (host->plat->translate_vdd)
437 pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
439 switch (ios->power_mode) {
450 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
453 writel(clk, host->base + MMCICLOCK);
455 if (host->pwr != pwr) {
457 writel(pwr, host->base + MMCIPOWER);
461 static const struct mmc_host_ops mmci_ops = {
462 .request = mmci_request,
463 .set_ios = mmci_set_ios,
466 static void mmci_check_status(unsigned long data)
468 struct mmci_host *host = (struct mmci_host *)data;
471 status = host->plat->status(mmc_dev(host->mmc));
472 if (status ^ host->oldstat)
473 mmc_detect_change(host->mmc, 0);
475 host->oldstat = status;
476 mod_timer(&host->timer, jiffies + HZ);
479 static int mmci_probe(struct amba_device *dev, void *id)
481 struct mmc_platform_data *plat = dev->dev.platform_data;
482 struct mmci_host *host;
483 struct mmc_host *mmc;
486 /* must have platform data */
492 ret = amba_request_regions(dev, DRIVER_NAME);
496 mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
502 host = mmc_priv(mmc);
503 host->clk = clk_get(&dev->dev, "MCLK");
504 if (IS_ERR(host->clk)) {
505 ret = PTR_ERR(host->clk);
510 ret = clk_enable(host->clk);
515 host->mclk = clk_get_rate(host->clk);
517 * According to the spec, mclk is max 100 MHz,
518 * so we try to adjust the clock down to this,
521 if (host->mclk > 100000000) {
522 ret = clk_set_rate(host->clk, 100000000);
525 host->mclk = clk_get_rate(host->clk);
526 DBG(host, "eventual mclk rate: %u Hz\n", host->mclk);
529 host->base = ioremap(dev->res.start, SZ_4K);
535 mmc->ops = &mmci_ops;
536 mmc->f_min = (host->mclk + 511) / 512;
537 mmc->f_max = min(host->mclk, fmax);
538 mmc->ocr_avail = plat->ocr_mask;
543 mmc->max_hw_segs = 16;
544 mmc->max_phys_segs = NR_SG;
547 * Since we only have a 16-bit data length register, we must
548 * ensure that we don't exceed 2^16-1 bytes in a single request.
550 mmc->max_req_size = 65535;
553 * Set the maximum segment size. Since we aren't doing DMA
554 * (yet) we are only limited by the data length register.
556 mmc->max_seg_size = mmc->max_req_size;
559 * Block size can be up to 2048 bytes, but must be a power of two.
561 mmc->max_blk_size = 2048;
564 * No limit on the number of blocks transferred.
566 mmc->max_blk_count = mmc->max_req_size;
568 spin_lock_init(&host->lock);
570 writel(0, host->base + MMCIMASK0);
571 writel(0, host->base + MMCIMASK1);
572 writel(0xfff, host->base + MMCICLEAR);
574 ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
578 ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
582 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
584 amba_set_drvdata(dev, mmc);
588 printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
589 mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
590 (unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);
592 init_timer(&host->timer);
593 host->timer.data = (unsigned long)host;
594 host->timer.function = mmci_check_status;
595 host->timer.expires = jiffies + HZ;
596 add_timer(&host->timer);
601 free_irq(dev->irq[0], host);
605 clk_disable(host->clk);
611 amba_release_regions(dev);
616 static int mmci_remove(struct amba_device *dev)
618 struct mmc_host *mmc = amba_get_drvdata(dev);
620 amba_set_drvdata(dev, NULL);
623 struct mmci_host *host = mmc_priv(mmc);
625 del_timer_sync(&host->timer);
627 mmc_remove_host(mmc);
629 writel(0, host->base + MMCIMASK0);
630 writel(0, host->base + MMCIMASK1);
632 writel(0, host->base + MMCICOMMAND);
633 writel(0, host->base + MMCIDATACTRL);
635 free_irq(dev->irq[0], host);
636 free_irq(dev->irq[1], host);
639 clk_disable(host->clk);
644 amba_release_regions(dev);
651 static int mmci_suspend(struct amba_device *dev, pm_message_t state)
653 struct mmc_host *mmc = amba_get_drvdata(dev);
657 struct mmci_host *host = mmc_priv(mmc);
659 ret = mmc_suspend_host(mmc, state);
661 writel(0, host->base + MMCIMASK0);
667 static int mmci_resume(struct amba_device *dev)
669 struct mmc_host *mmc = amba_get_drvdata(dev);
673 struct mmci_host *host = mmc_priv(mmc);
675 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
677 ret = mmc_resume_host(mmc);
683 #define mmci_suspend NULL
684 #define mmci_resume NULL
687 static struct amba_id mmci_ids[] = {
699 static struct amba_driver mmci_driver = {
704 .remove = mmci_remove,
705 .suspend = mmci_suspend,
706 .resume = mmci_resume,
707 .id_table = mmci_ids,
710 static int __init mmci_init(void)
712 return amba_driver_register(&mmci_driver);
715 static void __exit mmci_exit(void)
717 amba_driver_unregister(&mmci_driver);
720 module_init(mmci_init);
721 module_exit(mmci_exit);
722 module_param(fmax, uint, 0444);
724 MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
725 MODULE_LICENSE("GPL");