1 files changed, 610 insertions, 0 deletions

diff --git a/drivers/mmc/pxamci.c b/drivers/mmc/pxamci.c
new file mode 100644
index 000000000000..f76deedf5355
--- /dev/null
+++ b/drivers/mmc/pxamci.c
@@ -0,0 +1,610 @@
+/*
+ *  linux/drivers/mmc/pxa.c - PXA MMCI driver
+ *
+ *  Copyright (C) 2003 Russell King, 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.
+ *
+ *  This hardware is really sick:
+ *   - No way to clear interrupts.
+ *   - Have to turn off the clock whenever we touch the device.
+ *   - Doesn't tell you how many data blocks were transferred.
+ *  Yuck!
+ *
+ *      1 and 3 byte data transfers not supported
+ *      max block length up to 1023
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/protocol.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/scatterlist.h>
+#include <asm/sizes.h>
+
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/mmc.h>
+
+#include "pxamci.h"
+
+#ifdef CONFIG_MMC_DEBUG
+#define DBG(x...)       printk(KERN_DEBUG x)
+#else
+#define DBG(x...)       do { } while (0)
+#endif
+
+#define DRIVER_NAME     "pxa2xx-mci"
+
+#define NR_SG   1
+
+struct pxamci_host {
+        struct mmc_host         *mmc;
+        spinlock_t              lock;
+        struct resource         *res;
+        void __iomem            *base;
+        int                     irq;
+        int                     dma;
+        unsigned int            clkrt;
+        unsigned int            cmdat;
+        unsigned int            imask;
+        unsigned int            power_mode;
+        struct pxamci_platform_data *pdata;
+
+        struct mmc_request      *mrq;
+        struct mmc_command      *cmd;
+        struct mmc_data         *data;
+
+        dma_addr_t              sg_dma;
+        struct pxa_dma_desc     *sg_cpu;
+        unsigned int            dma_len;
+
+        unsigned int            dma_dir;
+};
+
+static inline unsigned int ns_to_clocks(unsigned int ns)
+{
+        return (ns * (CLOCKRATE / 1000000) + 999) / 1000;
+}
+
+static void pxamci_stop_clock(struct pxamci_host *host)
+{
+        if (readl(host->base + MMC_STAT) & STAT_CLK_EN) {
+                unsigned long timeout = 10000;
+                unsigned int v;
+
+                writel(STOP_CLOCK, host->base + MMC_STRPCL);
+
+                do {
+                        v = readl(host->base + MMC_STAT);
+                        if (!(v & STAT_CLK_EN))
+                                break;
+                        udelay(1);
+                } while (timeout--);
+
+                if (v & STAT_CLK_EN)
+                        dev_err(mmc_dev(host->mmc), "unable to stop clock\n");
+        }
+}
+
+static void pxamci_enable_irq(struct pxamci_host *host, unsigned int mask)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&host->lock, flags);
+        host->imask &= ~mask;
+        writel(host->imask, host->base + MMC_I_MASK);
+        spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void pxamci_disable_irq(struct pxamci_host *host, unsigned int mask)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&host->lock, flags);
+        host->imask |= mask;
+        writel(host->imask, host->base + MMC_I_MASK);
+        spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
+{
+        unsigned int nob = data->blocks;
+        unsigned int timeout;
+        u32 dcmd;
+        int i;
+
+        host->data = data;
+
+        if (data->flags & MMC_DATA_STREAM)
+                nob = 0xffff;
+
+        writel(nob, host->base + MMC_NOB);
+        writel(1 << data->blksz_bits, host->base + MMC_BLKLEN);
+
+        timeout = ns_to_clocks(data->timeout_ns) + data->timeout_clks;
+        writel((timeout + 255) / 256, host->base + MMC_RDTO);
+
+        if (data->flags & MMC_DATA_READ) {
+                host->dma_dir = DMA_FROM_DEVICE;
+                dcmd = DCMD_INCTRGADDR | DCMD_FLOWTRG;
+                DRCMRTXMMC = 0;
+                DRCMRRXMMC = host->dma | DRCMR_MAPVLD;
+        } else {
+                host->dma_dir = DMA_TO_DEVICE;
+                dcmd = DCMD_INCSRCADDR | DCMD_FLOWSRC;
+                DRCMRRXMMC = 0;
+                DRCMRTXMMC = host->dma | DRCMR_MAPVLD;
+        }
+
+        dcmd |= DCMD_BURST32 | DCMD_WIDTH1;
+
+        host->dma_len = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
+                                   host->dma_dir);
+
+        for (i = 0; i < host->dma_len; i++) {
+                if (data->flags & MMC_DATA_READ) {
+                        host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
+                        host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
+                } else {
+                        host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
+                        host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
+                }
+                host->sg_cpu[i].dcmd = dcmd | sg_dma_len(&data->sg[i]);
+                host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
+                                        sizeof(struct pxa_dma_desc);
+        }
+        host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
+        wmb();
+
+        DDADR(host->dma) = host->sg_dma;
+        DCSR(host->dma) = DCSR_RUN;
+}
+
+static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
+{
+        WARN_ON(host->cmd != NULL);
+        host->cmd = cmd;
+
+        if (cmd->flags & MMC_RSP_BUSY)
+                cmdat |= CMDAT_BUSY;
+
+        switch (cmd->flags & (MMC_RSP_MASK | MMC_RSP_CRC)) {
+        case MMC_RSP_SHORT | MMC_RSP_CRC:
+                cmdat |= CMDAT_RESP_SHORT;
+                break;
+        case MMC_RSP_SHORT:
+                cmdat |= CMDAT_RESP_R3;
+                break;
+        case MMC_RSP_LONG | MMC_RSP_CRC:
+                cmdat |= CMDAT_RESP_R2;
+                break;
+        default:
+                break;
+        }
+
+        writel(cmd->opcode, host->base + MMC_CMD);
+        writel(cmd->arg >> 16, host->base + MMC_ARGH);
+        writel(cmd->arg & 0xffff, host->base + MMC_ARGL);
+        writel(cmdat, host->base + MMC_CMDAT);
+        writel(host->clkrt, host->base + MMC_CLKRT);
+
+        writel(START_CLOCK, host->base + MMC_STRPCL);
+
+        pxamci_enable_irq(host, END_CMD_RES);
+}
+
+static void pxamci_finish_request(struct pxamci_host *host, struct mmc_request *mrq)
+{
+        DBG("PXAMCI: request done\n");
+        host->mrq = NULL;
+        host->cmd = NULL;
+        host->data = NULL;
+        mmc_request_done(host->mmc, mrq);
+}
+
+static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
+{
+        struct mmc_command *cmd = host->cmd;
+        int i;
+        u32 v;
+
+        if (!cmd)
+                return 0;
+
+        host->cmd = NULL;
+
+        /*
+         * Did I mention this is Sick.  We always need to
+         * discard the upper 8 bits of the first 16-bit word.
+         */
+        v = readl(host->base + MMC_RES) & 0xffff;
+        for (i = 0; i < 4; i++) {
+                u32 w1 = readl(host->base + MMC_RES) & 0xffff;
+                u32 w2 = readl(host->base + MMC_RES) & 0xffff;
+                cmd->resp[i] = v << 24 | w1 << 8 | w2 >> 8;
+                v = w2;
+        }
+
+        if (stat & STAT_TIME_OUT_RESPONSE) {
+                cmd->error = MMC_ERR_TIMEOUT;
+        } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
+#ifdef CONFIG_PXA27x
+                /*
+                 * workaround for erratum #42:
+                 * Intel PXA27x Family Processor Specification Update Rev 001
+                 */
+                if (cmd->opcode == MMC_ALL_SEND_CID ||
+                    cmd->opcode == MMC_SEND_CSD ||
+                    cmd->opcode == MMC_SEND_CID) {
+                        /* a bogus CRC error can appear if the msb of
+                           the 15 byte response is a one */
+                        if ((cmd->resp[0] & 0x80000000) == 0)
+                                cmd->error = MMC_ERR_BADCRC;
+                } else {
+                        DBG("ignoring CRC from command %d - *risky*\n",cmd->opcode);
+                }
+#else
+                cmd->error = MMC_ERR_BADCRC;
+#endif
+        }
+
+        pxamci_disable_irq(host, END_CMD_RES);
+        if (host->data && cmd->error == MMC_ERR_NONE) {
+                pxamci_enable_irq(host, DATA_TRAN_DONE);
+        } else {
+                pxamci_finish_request(host, host->mrq);
+        }
+
+        return 1;
+}
+
+static int pxamci_data_done(struct pxamci_host *host, unsigned int stat)
+{
+        struct mmc_data *data = host->data;
+
+        if (!data)
+                return 0;
+
+        DCSR(host->dma) = 0;
+        dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->dma_len,
+                     host->dma_dir);
+
+        if (stat & STAT_READ_TIME_OUT)
+                data->error = MMC_ERR_TIMEOUT;
+        else if (stat & (STAT_CRC_READ_ERROR|STAT_CRC_WRITE_ERROR))
+                data->error = MMC_ERR_BADCRC;
+
+        /*
+         * There appears to be a hardware design bug here.  There seems to
+         * be no way to find out how much data was transferred to the card.
+         * This means that if there was an error on any block, we mark all
+         * data blocks as being in error.
+         */
+        if (data->error == MMC_ERR_NONE)
+                data->bytes_xfered = data->blocks << data->blksz_bits;
+        else
+                data->bytes_xfered = 0;
+
+        pxamci_disable_irq(host, DATA_TRAN_DONE);
+
+        host->data = NULL;
+        if (host->mrq->stop && data->error == MMC_ERR_NONE) {
+                pxamci_stop_clock(host);
+                pxamci_start_cmd(host, host->mrq->stop, 0);
+        } else {
+                pxamci_finish_request(host, host->mrq);
+        }
+
+        return 1;
+}
+
+static irqreturn_t pxamci_irq(int irq, void *devid, struct pt_regs *regs)
+{
+        struct pxamci_host *host = devid;
+        unsigned int ireg;
+        int handled = 0;
+
+        ireg = readl(host->base + MMC_I_REG);
+
+        DBG("PXAMCI: irq %08x\n", ireg);
+
+        if (ireg) {
+                unsigned stat = readl(host->base + MMC_STAT);
+
+                DBG("PXAMCI: stat %08x\n", stat);
+
+                if (ireg & END_CMD_RES)
+                        handled |= pxamci_cmd_done(host, stat);
+                if (ireg & DATA_TRAN_DONE)
+                        handled |= pxamci_data_done(host, stat);
+        }
+
+        return IRQ_RETVAL(handled);
+}
+
+static void pxamci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+        struct pxamci_host *host = mmc_priv(mmc);
+        unsigned int cmdat;
+
+        WARN_ON(host->mrq != NULL);
+
+        host->mrq = mrq;
+
+        pxamci_stop_clock(host);
+
+        cmdat = host->cmdat;
+        host->cmdat &= ~CMDAT_INIT;
+
+        if (mrq->data) {
+                pxamci_setup_data(host, mrq->data);
+
+                cmdat &= ~CMDAT_BUSY;
+                cmdat |= CMDAT_DATAEN | CMDAT_DMAEN;
+                if (mrq->data->flags & MMC_DATA_WRITE)
+                        cmdat |= CMDAT_WRITE;
+
+                if (mrq->data->flags & MMC_DATA_STREAM)
+                        cmdat |= CMDAT_STREAM;
+        }
+
+        pxamci_start_cmd(host, mrq->cmd, cmdat);
+}
+
+static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+        struct pxamci_host *host = mmc_priv(mmc);
+
+        DBG("pxamci_set_ios: clock %u power %u vdd %u.%02u\n",
+            ios->clock, ios->power_mode, ios->vdd / 100,
+            ios->vdd % 100);
+
+        if (ios->clock) {
+                unsigned int clk = CLOCKRATE / ios->clock;
+                if (CLOCKRATE / clk > ios->clock)
+                        clk <<= 1;
+                host->clkrt = fls(clk) - 1;
+                pxa_set_cken(CKEN12_MMC, 1);
+
+                /*
+                 * we write clkrt on the next command
+                 */
+        } else {
+                pxamci_stop_clock(host);
+                pxa_set_cken(CKEN12_MMC, 0);
+        }
+
+        if (host->power_mode != ios->power_mode) {
+                host->power_mode = ios->power_mode;
+
+                if (host->pdata && host->pdata->setpower)
+                        host->pdata->setpower(mmc->dev, ios->vdd);
+
+                if (ios->power_mode == MMC_POWER_ON)
+                        host->cmdat |= CMDAT_INIT;
+        }
+
+        DBG("pxamci_set_ios: clkrt = %x cmdat = %x\n",
+            host->clkrt, host->cmdat);
+}
+
+static struct mmc_host_ops pxamci_ops = {
+        .request        = pxamci_request,
+        .set_ios        = pxamci_set_ios,
+};
+
+static void pxamci_dma_irq(int dma, void *devid, struct pt_regs *regs)
+{
+        printk(KERN_ERR "DMA%d: IRQ???\n", dma);
+        DCSR(dma) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;
+}
+
+static irqreturn_t pxamci_detect_irq(int irq, void *devid, struct pt_regs *regs)
+{
+        mmc_detect_change(devid);
+        return IRQ_HANDLED;
+}
+
+static int pxamci_probe(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct mmc_host *mmc;
+        struct pxamci_host *host = NULL;
+        struct resource *r;
+        int ret, irq;
+
+        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        irq = platform_get_irq(pdev, 0);
+        if (!r || irq == NO_IRQ)
+                return -ENXIO;
+
+        r = request_mem_region(r->start, SZ_4K, DRIVER_NAME);
+        if (!r)
+                return -EBUSY;
+
+        mmc = mmc_alloc_host(sizeof(struct pxamci_host), dev);
+        if (!mmc) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        mmc->ops = &pxamci_ops;
+        mmc->f_min = CLOCKRATE_MIN;
+        mmc->f_max = CLOCKRATE_MAX;
+
+        /*
+         * We can do SG-DMA, but we don't because we never know how much
+         * data we successfully wrote to the card.
+         */
+        mmc->max_phys_segs = NR_SG;
+
+        /*
+         * Our hardware DMA can handle a maximum of one page per SG entry.
+         */
+        mmc->max_seg_size = PAGE_SIZE;
+
+        host = mmc_priv(mmc);
+        host->mmc = mmc;
+        host->dma = -1;
+        host->pdata = pdev->dev.platform_data;
+        mmc->ocr_avail = host->pdata ?
+                         host->pdata->ocr_mask :
+                         MMC_VDD_32_33|MMC_VDD_33_34;
+
+        host->sg_cpu = dma_alloc_coherent(dev, PAGE_SIZE, &host->sg_dma, GFP_KERNEL);
+        if (!host->sg_cpu) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        spin_lock_init(&host->lock);
+        host->res = r;
+        host->irq = irq;
+        host->imask = MMC_I_MASK_ALL;
+
+        host->base = ioremap(r->start, SZ_4K);
+        if (!host->base) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        /*
+         * Ensure that the host controller is shut down, and setup
+         * with our defaults.
+         */
+        pxamci_stop_clock(host);
+        writel(0, host->base + MMC_SPI);
+        writel(64, host->base + MMC_RESTO);
+        writel(host->imask, host->base + MMC_I_MASK);
+
+        host->dma = pxa_request_dma(DRIVER_NAME, DMA_PRIO_LOW,
+                                    pxamci_dma_irq, host);
+        if (host->dma < 0) {
+                ret = -EBUSY;
+                goto out;
+        }
+
+        ret = request_irq(host->irq, pxamci_irq, 0, DRIVER_NAME, host);
+        if (ret)
+                goto out;
+
+        dev_set_drvdata(dev, mmc);
+
+        if (host->pdata && host->pdata->init)
+                host->pdata->init(dev, pxamci_detect_irq, mmc);
+
+        mmc_add_host(mmc);
+
+        return 0;
+
+ out:
+        if (host) {
+                if (host->dma >= 0)
+                        pxa_free_dma(host->dma);
+                if (host->base)
+                        iounmap(host->base);
+                if (host->sg_cpu)
+                        dma_free_coherent(dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
+        }
+        if (mmc)
+                mmc_free_host(mmc);
+        release_resource(r);
+        return ret;
+}
+
+static int pxamci_remove(struct device *dev)
+{
+        struct mmc_host *mmc = dev_get_drvdata(dev);
+
+        dev_set_drvdata(dev, NULL);
+
+        if (mmc) {
+                struct pxamci_host *host = mmc_priv(mmc);
+
+                if (host->pdata && host->pdata->exit)
+                        host->pdata->exit(dev, mmc);
+
+                mmc_remove_host(mmc);
+
+                pxamci_stop_clock(host);
+                writel(TXFIFO_WR_REQ|RXFIFO_RD_REQ|CLK_IS_OFF|STOP_CMD|
+                       END_CMD_RES|PRG_DONE|DATA_TRAN_DONE,
+                       host->base + MMC_I_MASK);
+
+                DRCMRRXMMC = 0;
+                DRCMRTXMMC = 0;
+
+                free_irq(host->irq, host);
+                pxa_free_dma(host->dma);
+                iounmap(host->base);
+                dma_free_coherent(dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
+
+                release_resource(host->res);
+
+                mmc_free_host(mmc);
+        }
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int pxamci_suspend(struct device *dev, u32 state, u32 level)
+{
+        struct mmc_host *mmc = dev_get_drvdata(dev);
+        int ret = 0;
+
+        if (mmc && level == SUSPEND_DISABLE)
+                ret = mmc_suspend_host(mmc, state);
+
+        return ret;
+}
+
+static int pxamci_resume(struct device *dev, u32 level)
+{
+        struct mmc_host *mmc = dev_get_drvdata(dev);
+        int ret = 0;
+
+        if (mmc && level == RESUME_ENABLE)
+                ret = mmc_resume_host(mmc);
+
+        return ret;
+}
+#else
+#define pxamci_suspend  NULL
+#define pxamci_resume   NULL
+#endif
+
+static struct device_driver pxamci_driver = {
+        .name           = DRIVER_NAME,
+        .bus            = &platform_bus_type,
+        .probe          = pxamci_probe,
+        .remove         = pxamci_remove,
+        .suspend        = pxamci_suspend,
+        .resume         = pxamci_resume,
+};
+
+static int __init pxamci_init(void)
+{
+        return driver_register(&pxamci_driver);
+}
+
+static void __exit pxamci_exit(void)
+{
+        driver_unregister(&pxamci_driver);
+}
+
+module_init(pxamci_init);
+module_exit(pxamci_exit);
+
+MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
+MODULE_LICENSE("GPL");