/* * 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/div64.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; unsigned long long clks; 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); 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); 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, 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");