diff options
Diffstat (limited to 'drivers/mmc/mmci.c')
| -rw-r--r-- | drivers/mmc/mmci.c | 703 |
1 files changed, 0 insertions, 703 deletions
diff --git a/drivers/mmc/mmci.c b/drivers/mmc/mmci.c deleted file mode 100644 index 5941dd951e82..000000000000 --- a/drivers/mmc/mmci.c +++ /dev/null @@ -1,703 +0,0 @@ -/* - * 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/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 <linux/amba/bus.h> -#include <linux/clk.h> - -#include <asm/cacheflush.h> -#include <asm/div64.h> -#include <asm/io.h> -#include <asm/scatterlist.h> -#include <asm/sizes.h> -#include <asm/mach/mmc.h> - -#include "mmci.h" - -#define DRIVER_NAME "mmci-pl18x" - -#define DBG(host,fmt,args...) \ - pr_debug("%s: %s: " fmt, mmc_hostname(host->mmc), __func__ , args) - -static unsigned int fmax = 515633; - -static void -mmci_request_end(struct mmci_host *host, struct mmc_request *mrq) -{ - writel(0, host->base + MMCICOMMAND); - - BUG_ON(host->data); - - 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; - unsigned long long clks; - void __iomem *base; - int blksz_bits; - - DBG(host, "blksz %04x blks %04x flags %08x\n", - data->blksz, data->blocks, data->flags); - - host->data = data; - host->size = data->blksz; - host->data_xfered = 0; - - mmci_init_sg(host, data); - - clks = (unsigned long long)data->timeout_ns * host->cclk; - do_div(clks, 1000000000UL); - - timeout = data->timeout_clks + (unsigned int)clks; - - base = host->base; - writel(timeout, base + MMCIDATATIMER); - writel(host->size, base + MMCIDATALENGTH); - - blksz_bits = ffs(data->blksz) - 1; - BUG_ON(1 << blksz_bits != data->blksz); - - datactrl = MCI_DPSM_ENABLE | blksz_bits << 4; - if (data->flags & MMC_DATA_READ) { - datactrl |= MCI_DPSM_DIRECTION; - irqmask = MCI_RXFIFOHALFFULLMASK; - - /* - * If we have less than a FIFOSIZE of bytes to transfer, - * trigger a PIO interrupt as soon as any data is available. - */ - if (host->size < MCI_FIFOSIZE) - irqmask |= MCI_RXDATAAVLBLMASK; - } 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; - if (cmd->flags & MMC_RSP_PRESENT) { - if (cmd->flags & MMC_RSP_136) - c |= MCI_CPSM_LONGRSP; - c |= MCI_CPSM_RESPONSE; - } - 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 += data->blksz; - } - 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; - - /* - * We hit an error condition. Ensure that any data - * partially written to a page is properly coherent. - */ - if (host->sg_len && data->flags & MMC_DATA_READ) - flush_dcache_page(host->sg_ptr->page); - } - 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) { - if (host->data) - mmci_stop_data(host); - 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 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, buffer, &flags); - - host->sg_off += len; - host->size -= len; - remain -= len; - - if (remain) - break; - - /* - * If we were reading, and we have completed this - * page, ensure that the data cache is coherent. - */ - if (status & MCI_RXACTIVE) - flush_dcache_page(host->sg_ptr->page); - - 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 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; - - 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 const 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, 0); - - 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_enable(host->clk); - if (ret) - goto clk_free; - - 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; - mmc->caps = MMC_CAP_MULTIWRITE; - - /* - * 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. - */ - mmc->max_req_size = 65535; - - /* - * 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_req_size; - - /* - * Block size can be up to 2048 bytes, but must be a power of two. - */ - mmc->max_blk_size = 2048; - - /* - * No limit on the number of blocks transferred. - */ - mmc->max_blk_count = mmc->max_req_size; - - 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, IRQF_SHARED, DRIVER_NAME " (cmd)", host); - if (ret) - goto unmap; - - ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, 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%016llx irq %d,%d\n", - mmc_hostname(mmc), amba_rev(dev), amba_config(dev), - (unsigned long long)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_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_put(host->clk); - - mmc_free_host(mmc); - - amba_release_regions(dev); - } - - return 0; -} - -#ifdef CONFIG_PM -static int mmci_suspend(struct amba_device *dev, pm_message_t 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"); |