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path: root/drivers/mmc/mmci.c
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-rw-r--r--drivers/mmc/mmci.c680
1 files changed, 680 insertions, 0 deletions
diff --git a/drivers/mmc/mmci.c b/drivers/mmc/mmci.c
new file mode 100644
index 00000000000..3ee961c206b
--- /dev/null
+++ b/drivers/mmc/mmci.c
@@ -0,0 +1,680 @@
+/*
+ * linux/drivers/mmc/mmci.c - ARM PrimeCell MMCI PL180/1 driver
+ *
+ * Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/highmem.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/protocol.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/scatterlist.h>
+#include <asm/hardware/amba.h>
+#include <asm/hardware/clock.h>
+#include <asm/mach/mmc.h>
+
+#include "mmci.h"
+
+#define DRIVER_NAME "mmci-pl18x"
+
+#ifdef CONFIG_MMC_DEBUG
+#define DBG(host,fmt,args...) \
+ pr_debug("%s: %s: " fmt, host->mmc->host_name, __func__ , args)
+#else
+#define DBG(host,fmt,args...) do { } while (0)
+#endif
+
+static unsigned int fmax = 515633;
+
+static void
+mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
+{
+ writel(0, host->base + MMCICOMMAND);
+
+ host->mrq = NULL;
+ host->cmd = NULL;
+
+ if (mrq->data)
+ mrq->data->bytes_xfered = host->data_xfered;
+
+ /*
+ * Need to drop the host lock here; mmc_request_done may call
+ * back into the driver...
+ */
+ spin_unlock(&host->lock);
+ mmc_request_done(host->mmc, mrq);
+ spin_lock(&host->lock);
+}
+
+static void mmci_stop_data(struct mmci_host *host)
+{
+ writel(0, host->base + MMCIDATACTRL);
+ writel(0, host->base + MMCIMASK1);
+ host->data = NULL;
+}
+
+static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
+{
+ unsigned int datactrl, timeout, irqmask;
+ void __iomem *base;
+
+ DBG(host, "blksz %04x blks %04x flags %08x\n",
+ 1 << data->blksz_bits, data->blocks, data->flags);
+
+ host->data = data;
+ host->size = data->blocks << data->blksz_bits;
+ host->data_xfered = 0;
+
+ mmci_init_sg(host, data);
+
+ timeout = data->timeout_clks +
+ ((unsigned long long)data->timeout_ns * host->cclk) /
+ 1000000000ULL;
+
+ base = host->base;
+ writel(timeout, base + MMCIDATATIMER);
+ writel(host->size, base + MMCIDATALENGTH);
+
+ datactrl = MCI_DPSM_ENABLE | data->blksz_bits << 4;
+ if (data->flags & MMC_DATA_READ) {
+ datactrl |= MCI_DPSM_DIRECTION;
+ irqmask = MCI_RXFIFOHALFFULLMASK;
+ } else {
+ /*
+ * We don't actually need to include "FIFO empty" here
+ * since its implicit in "FIFO half empty".
+ */
+ irqmask = MCI_TXFIFOHALFEMPTYMASK;
+ }
+
+ writel(datactrl, base + MMCIDATACTRL);
+ writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
+ writel(irqmask, base + MMCIMASK1);
+}
+
+static void
+mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
+{
+ void __iomem *base = host->base;
+
+ DBG(host, "op %02x arg %08x flags %08x\n",
+ cmd->opcode, cmd->arg, cmd->flags);
+
+ if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
+ writel(0, base + MMCICOMMAND);
+ udelay(1);
+ }
+
+ c |= cmd->opcode | MCI_CPSM_ENABLE;
+ switch (cmd->flags & MMC_RSP_MASK) {
+ case MMC_RSP_NONE:
+ default:
+ break;
+ case MMC_RSP_LONG:
+ c |= MCI_CPSM_LONGRSP;
+ case MMC_RSP_SHORT:
+ c |= MCI_CPSM_RESPONSE;
+ break;
+ }
+ if (/*interrupt*/0)
+ c |= MCI_CPSM_INTERRUPT;
+
+ host->cmd = cmd;
+
+ writel(cmd->arg, base + MMCIARGUMENT);
+ writel(c, base + MMCICOMMAND);
+}
+
+static void
+mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
+ unsigned int status)
+{
+ if (status & MCI_DATABLOCKEND) {
+ host->data_xfered += 1 << data->blksz_bits;
+ }
+ if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
+ if (status & MCI_DATACRCFAIL)
+ data->error = MMC_ERR_BADCRC;
+ else if (status & MCI_DATATIMEOUT)
+ data->error = MMC_ERR_TIMEOUT;
+ else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
+ data->error = MMC_ERR_FIFO;
+ status |= MCI_DATAEND;
+ }
+ if (status & MCI_DATAEND) {
+ mmci_stop_data(host);
+
+ if (!data->stop) {
+ mmci_request_end(host, data->mrq);
+ } else {
+ mmci_start_command(host, data->stop, 0);
+ }
+ }
+}
+
+static void
+mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
+ unsigned int status)
+{
+ void __iomem *base = host->base;
+
+ host->cmd = NULL;
+
+ cmd->resp[0] = readl(base + MMCIRESPONSE0);
+ cmd->resp[1] = readl(base + MMCIRESPONSE1);
+ cmd->resp[2] = readl(base + MMCIRESPONSE2);
+ cmd->resp[3] = readl(base + MMCIRESPONSE3);
+
+ if (status & MCI_CMDTIMEOUT) {
+ cmd->error = MMC_ERR_TIMEOUT;
+ } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
+ cmd->error = MMC_ERR_BADCRC;
+ }
+
+ if (!cmd->data || cmd->error != MMC_ERR_NONE) {
+ mmci_request_end(host, cmd->mrq);
+ } else if (!(cmd->data->flags & MMC_DATA_READ)) {
+ mmci_start_data(host, cmd->data);
+ }
+}
+
+static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
+{
+ void __iomem *base = host->base;
+ char *ptr = buffer;
+ u32 status;
+
+ do {
+ int count = host->size - (readl(base + MMCIFIFOCNT) << 2);
+
+ if (count > remain)
+ count = remain;
+
+ if (count <= 0)
+ break;
+
+ readsl(base + MMCIFIFO, ptr, count >> 2);
+
+ ptr += count;
+ remain -= count;
+
+ if (remain == 0)
+ break;
+
+ status = readl(base + MMCISTATUS);
+ } while (status & MCI_RXDATAAVLBL);
+
+ return ptr - buffer;
+}
+
+static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
+{
+ void __iomem *base = host->base;
+ char *ptr = buffer;
+
+ do {
+ unsigned int count, maxcnt;
+
+ maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
+ count = min(remain, maxcnt);
+
+ writesl(base + MMCIFIFO, ptr, count >> 2);
+
+ ptr += count;
+ remain -= count;
+
+ if (remain == 0)
+ break;
+
+ status = readl(base + MMCISTATUS);
+ } while (status & MCI_TXFIFOHALFEMPTY);
+
+ return ptr - buffer;
+}
+
+/*
+ * PIO data transfer IRQ handler.
+ */
+static irqreturn_t mmci_pio_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct mmci_host *host = dev_id;
+ void __iomem *base = host->base;
+ u32 status;
+
+ status = readl(base + MMCISTATUS);
+
+ DBG(host, "irq1 %08x\n", status);
+
+ do {
+ unsigned long flags;
+ unsigned int remain, len;
+ char *buffer;
+
+ /*
+ * For write, we only need to test the half-empty flag
+ * here - if the FIFO is completely empty, then by
+ * definition it is more than half empty.
+ *
+ * For read, check for data available.
+ */
+ if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
+ break;
+
+ /*
+ * Map the current scatter buffer.
+ */
+ buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
+ remain = host->sg_ptr->length - host->sg_off;
+
+ len = 0;
+ if (status & MCI_RXACTIVE)
+ len = mmci_pio_read(host, buffer, remain);
+ if (status & MCI_TXACTIVE)
+ len = mmci_pio_write(host, buffer, remain, status);
+
+ /*
+ * Unmap the buffer.
+ */
+ mmci_kunmap_atomic(host, &flags);
+
+ host->sg_off += len;
+ host->size -= len;
+ remain -= len;
+
+ if (remain)
+ break;
+
+ if (!mmci_next_sg(host))
+ break;
+
+ status = readl(base + MMCISTATUS);
+ } while (1);
+
+ /*
+ * If we're nearing the end of the read, switch to
+ * "any data available" mode.
+ */
+ if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
+ writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);
+
+ /*
+ * If we run out of data, disable the data IRQs; this
+ * prevents a race where the FIFO becomes empty before
+ * the chip itself has disabled the data path, and
+ * stops us racing with our data end IRQ.
+ */
+ if (host->size == 0) {
+ writel(0, base + MMCIMASK1);
+ writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Handle completion of command and data transfers.
+ */
+static irqreturn_t mmci_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct mmci_host *host = dev_id;
+ u32 status;
+ int ret = 0;
+
+ spin_lock(&host->lock);
+
+ do {
+ struct mmc_command *cmd;
+ struct mmc_data *data;
+
+ status = readl(host->base + MMCISTATUS);
+ status &= readl(host->base + MMCIMASK0);
+ writel(status, host->base + MMCICLEAR);
+
+ DBG(host, "irq0 %08x\n", status);
+
+ data = host->data;
+ if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|
+ MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data)
+ mmci_data_irq(host, data, status);
+
+ cmd = host->cmd;
+ if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
+ mmci_cmd_irq(host, cmd, status);
+
+ ret = 1;
+ } while (status);
+
+ spin_unlock(&host->lock);
+
+ return IRQ_RETVAL(ret);
+}
+
+static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+
+ WARN_ON(host->mrq != NULL);
+
+ spin_lock_irq(&host->lock);
+
+ host->mrq = mrq;
+
+ if (mrq->data && mrq->data->flags & MMC_DATA_READ)
+ mmci_start_data(host, mrq->data);
+
+ mmci_start_command(host, mrq->cmd, 0);
+
+ spin_unlock_irq(&host->lock);
+}
+
+static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct mmci_host *host = mmc_priv(mmc);
+ u32 clk = 0, pwr = 0;
+
+ DBG(host, "clock %uHz busmode %u powermode %u Vdd %u\n",
+ ios->clock, ios->bus_mode, ios->power_mode, ios->vdd);
+
+ if (ios->clock) {
+ if (ios->clock >= host->mclk) {
+ clk = MCI_CLK_BYPASS;
+ host->cclk = host->mclk;
+ } else {
+ clk = host->mclk / (2 * ios->clock) - 1;
+ if (clk > 256)
+ clk = 255;
+ host->cclk = host->mclk / (2 * (clk + 1));
+ }
+ clk |= MCI_CLK_ENABLE;
+ }
+
+ if (host->plat->translate_vdd)
+ pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
+
+ switch (ios->power_mode) {
+ case MMC_POWER_OFF:
+ break;
+ case MMC_POWER_UP:
+ pwr |= MCI_PWR_UP;
+ break;
+ case MMC_POWER_ON:
+ pwr |= MCI_PWR_ON;
+ break;
+ }
+
+ if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+ pwr |= MCI_ROD;
+
+ writel(clk, host->base + MMCICLOCK);
+
+ if (host->pwr != pwr) {
+ host->pwr = pwr;
+ writel(pwr, host->base + MMCIPOWER);
+ }
+}
+
+static struct mmc_host_ops mmci_ops = {
+ .request = mmci_request,
+ .set_ios = mmci_set_ios,
+};
+
+static void mmci_check_status(unsigned long data)
+{
+ struct mmci_host *host = (struct mmci_host *)data;
+ unsigned int status;
+
+ status = host->plat->status(mmc_dev(host->mmc));
+ if (status ^ host->oldstat)
+ mmc_detect_change(host->mmc);
+
+ host->oldstat = status;
+ mod_timer(&host->timer, jiffies + HZ);
+}
+
+static int mmci_probe(struct amba_device *dev, void *id)
+{
+ struct mmc_platform_data *plat = dev->dev.platform_data;
+ struct mmci_host *host;
+ struct mmc_host *mmc;
+ int ret;
+
+ /* must have platform data */
+ if (!plat) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = amba_request_regions(dev, DRIVER_NAME);
+ if (ret)
+ goto out;
+
+ mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
+ if (!mmc) {
+ ret = -ENOMEM;
+ goto rel_regions;
+ }
+
+ host = mmc_priv(mmc);
+ host->clk = clk_get(&dev->dev, "MCLK");
+ if (IS_ERR(host->clk)) {
+ ret = PTR_ERR(host->clk);
+ host->clk = NULL;
+ goto host_free;
+ }
+
+ ret = clk_use(host->clk);
+ if (ret)
+ goto clk_free;
+
+ ret = clk_enable(host->clk);
+ if (ret)
+ goto clk_unuse;
+
+ host->plat = plat;
+ host->mclk = clk_get_rate(host->clk);
+ host->mmc = mmc;
+ host->base = ioremap(dev->res.start, SZ_4K);
+ if (!host->base) {
+ ret = -ENOMEM;
+ goto clk_disable;
+ }
+
+ mmc->ops = &mmci_ops;
+ mmc->f_min = (host->mclk + 511) / 512;
+ mmc->f_max = min(host->mclk, fmax);
+ mmc->ocr_avail = plat->ocr_mask;
+
+ /*
+ * We can do SGIO
+ */
+ mmc->max_hw_segs = 16;
+ mmc->max_phys_segs = NR_SG;
+
+ /*
+ * Since we only have a 16-bit data length register, we must
+ * ensure that we don't exceed 2^16-1 bytes in a single request.
+ * Choose 64 (512-byte) sectors as the limit.
+ */
+ mmc->max_sectors = 64;
+
+ /*
+ * Set the maximum segment size. Since we aren't doing DMA
+ * (yet) we are only limited by the data length register.
+ */
+ mmc->max_seg_size = mmc->max_sectors << 9;
+
+ spin_lock_init(&host->lock);
+
+ writel(0, host->base + MMCIMASK0);
+ writel(0, host->base + MMCIMASK1);
+ writel(0xfff, host->base + MMCICLEAR);
+
+ ret = request_irq(dev->irq[0], mmci_irq, SA_SHIRQ, DRIVER_NAME " (cmd)", host);
+ if (ret)
+ goto unmap;
+
+ ret = request_irq(dev->irq[1], mmci_pio_irq, SA_SHIRQ, DRIVER_NAME " (pio)", host);
+ if (ret)
+ goto irq0_free;
+
+ writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+
+ amba_set_drvdata(dev, mmc);
+
+ mmc_add_host(mmc);
+
+ printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%08lx irq %d,%d\n",
+ mmc->host_name, amba_rev(dev), amba_config(dev),
+ dev->res.start, dev->irq[0], dev->irq[1]);
+
+ init_timer(&host->timer);
+ host->timer.data = (unsigned long)host;
+ host->timer.function = mmci_check_status;
+ host->timer.expires = jiffies + HZ;
+ add_timer(&host->timer);
+
+ return 0;
+
+ irq0_free:
+ free_irq(dev->irq[0], host);
+ unmap:
+ iounmap(host->base);
+ clk_disable:
+ clk_disable(host->clk);
+ clk_unuse:
+ clk_unuse(host->clk);
+ clk_free:
+ clk_put(host->clk);
+ host_free:
+ mmc_free_host(mmc);
+ rel_regions:
+ amba_release_regions(dev);
+ out:
+ return ret;
+}
+
+static int mmci_remove(struct amba_device *dev)
+{
+ struct mmc_host *mmc = amba_get_drvdata(dev);
+
+ amba_set_drvdata(dev, NULL);
+
+ if (mmc) {
+ struct mmci_host *host = mmc_priv(mmc);
+
+ del_timer_sync(&host->timer);
+
+ mmc_remove_host(mmc);
+
+ writel(0, host->base + MMCIMASK0);
+ writel(0, host->base + MMCIMASK1);
+
+ writel(0, host->base + MMCICOMMAND);
+ writel(0, host->base + MMCIDATACTRL);
+
+ free_irq(dev->irq[0], host);
+ free_irq(dev->irq[1], host);
+
+ iounmap(host->base);
+ clk_disable(host->clk);
+ clk_unuse(host->clk);
+ clk_put(host->clk);
+
+ mmc_free_host(mmc);
+
+ amba_release_regions(dev);
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int mmci_suspend(struct amba_device *dev, u32 state)
+{
+ struct mmc_host *mmc = amba_get_drvdata(dev);
+ int ret = 0;
+
+ if (mmc) {
+ struct mmci_host *host = mmc_priv(mmc);
+
+ ret = mmc_suspend_host(mmc, state);
+ if (ret == 0)
+ writel(0, host->base + MMCIMASK0);
+ }
+
+ return ret;
+}
+
+static int mmci_resume(struct amba_device *dev)
+{
+ struct mmc_host *mmc = amba_get_drvdata(dev);
+ int ret = 0;
+
+ if (mmc) {
+ struct mmci_host *host = mmc_priv(mmc);
+
+ writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+
+ ret = mmc_resume_host(mmc);
+ }
+
+ return ret;
+}
+#else
+#define mmci_suspend NULL
+#define mmci_resume NULL
+#endif
+
+static struct amba_id mmci_ids[] = {
+ {
+ .id = 0x00041180,
+ .mask = 0x000fffff,
+ },
+ {
+ .id = 0x00041181,
+ .mask = 0x000fffff,
+ },
+ { 0, 0 },
+};
+
+static struct amba_driver mmci_driver = {
+ .drv = {
+ .name = DRIVER_NAME,
+ },
+ .probe = mmci_probe,
+ .remove = mmci_remove,
+ .suspend = mmci_suspend,
+ .resume = mmci_resume,
+ .id_table = mmci_ids,
+};
+
+static int __init mmci_init(void)
+{
+ return amba_driver_register(&mmci_driver);
+}
+
+static void __exit mmci_exit(void)
+{
+ amba_driver_unregister(&mmci_driver);
+}
+
+module_init(mmci_init);
+module_exit(mmci_exit);
+module_param(fmax, uint, 0444);
+
+MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-24 13:31:25 +0000