/* * Atmel MultiMedia Card Interface driver * * Copyright (C) 2004-2008 Atmel Corporation * * 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/blkdev.h> #include <linux/clk.h> #include <linux/debugfs.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gpio.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/ioport.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/scatterlist.h> #include <linux/seq_file.h> #include <linux/stat.h> #include <linux/mmc/host.h> #include <asm/atmel-mci.h> #include <asm/io.h> #include <asm/unaligned.h> #include <asm/arch/board.h> #include "atmel-mci-regs.h" #define ATMCI_DATA_ERROR_FLAGS (MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE) enum { EVENT_CMD_COMPLETE = 0, EVENT_DATA_ERROR, EVENT_DATA_COMPLETE, EVENT_STOP_SENT, EVENT_STOP_COMPLETE, EVENT_XFER_COMPLETE, }; struct atmel_mci { struct mmc_host *mmc; void __iomem *regs; struct scatterlist *sg; unsigned int pio_offset; struct mmc_request *mrq; struct mmc_command *cmd; struct mmc_data *data; u32 cmd_status; u32 data_status; u32 stop_status; u32 stop_cmdr; u32 mode_reg; u32 sdc_reg; struct tasklet_struct tasklet; unsigned long pending_events; unsigned long completed_events; int present; int detect_pin; int wp_pin; /* For detect pin debouncing */ struct timer_list detect_timer; unsigned long bus_hz; unsigned long mapbase; struct clk *mck; struct platform_device *pdev; }; #define atmci_is_completed(host, event) \ test_bit(event, &host->completed_events) #define atmci_test_and_clear_pending(host, event) \ test_and_clear_bit(event, &host->pending_events) #define atmci_test_and_set_completed(host, event) \ test_and_set_bit(event, &host->completed_events) #define atmci_set_completed(host, event) \ set_bit(event, &host->completed_events) #define atmci_set_pending(host, event) \ set_bit(event, &host->pending_events) #define atmci_clear_pending(host, event) \ clear_bit(event, &host->pending_events) /* * The debugfs stuff below is mostly optimized away when * CONFIG_DEBUG_FS is not set. */ static int atmci_req_show(struct seq_file *s, void *v) { struct atmel_mci *host = s->private; struct mmc_request *mrq = host->mrq; struct mmc_command *cmd; struct mmc_command *stop; struct mmc_data *data; /* Make sure we get a consistent snapshot */ spin_lock_irq(&host->mmc->lock); if (mrq) { cmd = mrq->cmd; data = mrq->data; stop = mrq->stop; if (cmd) seq_printf(s, "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", cmd->opcode, cmd->arg, cmd->flags, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[2], cmd->error); if (data) seq_printf(s, "DATA %u / %u * %u flg %x err %d\n", data->bytes_xfered, data->blocks, data->blksz, data->flags, data->error); if (stop) seq_printf(s, "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", stop->opcode, stop->arg, stop->flags, stop->resp[0], stop->resp[1], stop->resp[2], stop->resp[2], stop->error); } spin_unlock_irq(&host->mmc->lock); return 0; } static int atmci_req_open(struct inode *inode, struct file *file) { return single_open(file, atmci_req_show, inode->i_private); } static const struct file_operations atmci_req_fops = { .owner = THIS_MODULE, .open = atmci_req_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static void atmci_show_status_reg(struct seq_file *s, const char *regname, u32 value) { static const char *sr_bit[] = { [0] = "CMDRDY", [1] = "RXRDY", [2] = "TXRDY", [3] = "BLKE", [4] = "DTIP", [5] = "NOTBUSY", [8] = "SDIOIRQA", [9] = "SDIOIRQB", [16] = "RINDE", [17] = "RDIRE", [18] = "RCRCE", [19] = "RENDE", [20] = "RTOE", [21] = "DCRCE", [22] = "DTOE", [30] = "OVRE", [31] = "UNRE", }; unsigned int i; seq_printf(s, "%s:\t0x%08x", regname, value); for (i = 0; i < ARRAY_SIZE(sr_bit); i++) { if (value & (1 << i)) { if (sr_bit[i]) seq_printf(s, " %s", sr_bit[i]); else seq_puts(s, " UNKNOWN"); } } seq_putc(s, '\n'); } static int atmci_regs_show(struct seq_file *s, void *v) { struct atmel_mci *host = s->private; u32 *buf; buf = kmalloc(MCI_REGS_SIZE, GFP_KERNEL); if (!buf) return -ENOMEM; /* Grab a more or less consistent snapshot */ spin_lock_irq(&host->mmc->lock); memcpy_fromio(buf, host->regs, MCI_REGS_SIZE); spin_unlock_irq(&host->mmc->lock); seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n", buf[MCI_MR / 4], buf[MCI_MR / 4] & MCI_MR_RDPROOF ? " RDPROOF" : "", buf[MCI_MR / 4] & MCI_MR_WRPROOF ? " WRPROOF" : "", buf[MCI_MR / 4] & 0xff); seq_printf(s, "DTOR:\t0x%08x\n", buf[MCI_DTOR / 4]); seq_printf(s, "SDCR:\t0x%08x\n", buf[MCI_SDCR / 4]); seq_printf(s, "ARGR:\t0x%08x\n", buf[MCI_ARGR / 4]); seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n", buf[MCI_BLKR / 4], buf[MCI_BLKR / 4] & 0xffff, (buf[MCI_BLKR / 4] >> 16) & 0xffff); /* Don't read RSPR and RDR; it will consume the data there */ atmci_show_status_reg(s, "SR", buf[MCI_SR / 4]); atmci_show_status_reg(s, "IMR", buf[MCI_IMR / 4]); return 0; } static int atmci_regs_open(struct inode *inode, struct file *file) { return single_open(file, atmci_regs_show, inode->i_private); } static const struct file_operations atmci_regs_fops = { .owner = THIS_MODULE, .open = atmci_regs_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static void atmci_init_debugfs(struct atmel_mci *host) { struct mmc_host *mmc; struct dentry *root; struct dentry *node; struct resource *res; mmc = host->mmc; root = mmc->debugfs_root; if (!root) return; node = debugfs_create_file("regs", S_IRUSR, root, host, &atmci_regs_fops); if (IS_ERR(node)) return; if (!node) goto err; res = platform_get_resource(host->pdev, IORESOURCE_MEM, 0); node->d_inode->i_size = res->end - res->start + 1; node = debugfs_create_file("req", S_IRUSR, root, host, &atmci_req_fops); if (!node) goto err; node = debugfs_create_x32("pending_events", S_IRUSR, root, (u32 *)&host->pending_events); if (!node) goto err; node = debugfs_create_x32("completed_events", S_IRUSR, root, (u32 *)&host->completed_events); if (!node) goto err; return; err: dev_err(&host->pdev->dev, "failed to initialize debugfs for controller\n"); } static void atmci_enable(struct atmel_mci *host) { clk_enable(host->mck); mci_writel(host, CR, MCI_CR_MCIEN); mci_writel(host, MR, host->mode_reg); mci_writel(host, SDCR, host->sdc_reg); } static void atmci_disable(struct atmel_mci *host) { mci_writel(host, CR, MCI_CR_SWRST); /* Stall until write is complete, then disable the bus clock */ mci_readl(host, SR); clk_disable(host->mck); } static inline unsigned int ns_to_clocks(struct atmel_mci *host, unsigned int ns) { return (ns * (host->bus_hz / 1000000) + 999) / 1000; } static void atmci_set_timeout(struct atmel_mci *host, struct mmc_data *data) { static unsigned dtomul_to_shift[] = { 0, 4, 7, 8, 10, 12, 16, 20 }; unsigned timeout; unsigned dtocyc; unsigned dtomul; timeout = ns_to_clocks(host, data->timeout_ns) + data->timeout_clks; for (dtomul = 0; dtomul < 8; dtomul++) { unsigned shift = dtomul_to_shift[dtomul]; dtocyc = (timeout + (1 << shift) - 1) >> shift; if (dtocyc < 15) break; } if (dtomul >= 8) { dtomul = 7; dtocyc = 15; } dev_vdbg(&host->mmc->class_dev, "setting timeout to %u cycles\n", dtocyc << dtomul_to_shift[dtomul]); mci_writel(host, DTOR, (MCI_DTOMUL(dtomul) | MCI_DTOCYC(dtocyc))); } /* * Return mask with command flags to be enabled for this command. */ static u32 atmci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd) { struct mmc_data *data; u32 cmdr; cmd->error = -EINPROGRESS; cmdr = MCI_CMDR_CMDNB(cmd->opcode); if (cmd->flags & MMC_RSP_PRESENT) { if (cmd->flags & MMC_RSP_136) cmdr |= MCI_CMDR_RSPTYP_136BIT; else cmdr |= MCI_CMDR_RSPTYP_48BIT; } /* * This should really be MAXLAT_5 for CMD2 and ACMD41, but * it's too difficult to determine whether this is an ACMD or * not. Better make it 64. */ cmdr |= MCI_CMDR_MAXLAT_64CYC; if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN) cmdr |= MCI_CMDR_OPDCMD; data = cmd->data; if (data) { cmdr |= MCI_CMDR_START_XFER; if (data->flags & MMC_DATA_STREAM) cmdr |= MCI_CMDR_STREAM; else if (data->blocks > 1) cmdr |= MCI_CMDR_MULTI_BLOCK; else cmdr |= MCI_CMDR_BLOCK; if (data->flags & MMC_DATA_READ) cmdr |= MCI_CMDR_TRDIR_READ; } return cmdr; } static void atmci_start_command(struct atmel_mci *host, struct mmc_command *cmd, u32 cmd_flags) { /* Must read host->cmd after testing event flags */ smp_rmb(); WARN_ON(host->cmd); host->cmd = cmd; dev_vdbg(&host->mmc->class_dev, "start command: ARGR=0x%08x CMDR=0x%08x\n", cmd->arg, cmd_flags); mci_writel(host, ARGR, cmd->arg); mci_writel(host, CMDR, cmd_flags); } static void send_stop_cmd(struct mmc_host *mmc, struct mmc_data *data) { struct atmel_mci *host = mmc_priv(mmc); atmci_start_command(host, data->stop, host->stop_cmdr); mci_writel(host, IER, MCI_CMDRDY); } static void atmci_request_end(struct mmc_host *mmc, struct mmc_request *mrq) { struct atmel_mci *host = mmc_priv(mmc); WARN_ON(host->cmd || host->data); host->mrq = NULL; atmci_disable(host); mmc_request_done(mmc, mrq); } /* * Returns a mask of interrupt flags to be enabled after the whole * request has been prepared. */ static u32 atmci_submit_data(struct mmc_host *mmc, struct mmc_data *data) { struct atmel_mci *host = mmc_priv(mmc); u32 iflags; data->error = -EINPROGRESS; WARN_ON(host->data); host->sg = NULL; host->data = data; mci_writel(host, BLKR, MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz)); dev_vdbg(&mmc->class_dev, "BLKR=0x%08x\n", MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz)); iflags = ATMCI_DATA_ERROR_FLAGS; host->sg = data->sg; host->pio_offset = 0; if (data->flags & MMC_DATA_READ) iflags |= MCI_RXRDY; else iflags |= MCI_TXRDY; return iflags; } static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct atmel_mci *host = mmc_priv(mmc); struct mmc_data *data; struct mmc_command *cmd; u32 iflags; u32 cmdflags = 0; iflags = mci_readl(host, IMR); if (iflags) dev_warn(&mmc->class_dev, "WARNING: IMR=0x%08x\n", mci_readl(host, IMR)); WARN_ON(host->mrq != NULL); /* * We may "know" the card is gone even though there's still an * electrical connection. If so, we really need to communicate * this to the MMC core since there won't be any more * interrupts as the card is completely removed. Otherwise, * the MMC core might believe the card is still there even * though the card was just removed very slowly. */ if (!host->present) { mrq->cmd->error = -ENOMEDIUM; mmc_request_done(mmc, mrq); return; } host->mrq = mrq; host->pending_events = 0; host->completed_events = 0; atmci_enable(host); /* We don't support multiple blocks of weird lengths. */ data = mrq->data; if (data) { if (data->blocks > 1 && data->blksz & 3) goto fail; atmci_set_timeout(host, data); } iflags = MCI_CMDRDY; cmd = mrq->cmd; cmdflags = atmci_prepare_command(mmc, cmd); atmci_start_command(host, cmd, cmdflags); if (data) iflags |= atmci_submit_data(mmc, data); if (mrq->stop) { host->stop_cmdr = atmci_prepare_command(mmc, mrq->stop); host->stop_cmdr |= MCI_CMDR_STOP_XFER; if (!(data->flags & MMC_DATA_WRITE)) host->stop_cmdr |= MCI_CMDR_TRDIR_READ; if (data->flags & MMC_DATA_STREAM) host->stop_cmdr |= MCI_CMDR_STREAM; else host->stop_cmdr |= MCI_CMDR_MULTI_BLOCK; } /* * We could have enabled interrupts earlier, but I suspect * that would open up a nice can of interesting race * conditions (e.g. command and data complete, but stop not * prepared yet.) */ mci_writel(host, IER, iflags); return; fail: atmci_disable(host); host->mrq = NULL; mrq->cmd->error = -EINVAL; mmc_request_done(mmc, mrq); } static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct atmel_mci *host = mmc_priv(mmc); if (ios->clock) { u32 clkdiv; /* Set clock rate */ clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * ios->clock) - 1; if (clkdiv > 255) { dev_warn(&mmc->class_dev, "clock %u too slow; using %lu\n", ios->clock, host->bus_hz / (2 * 256)); clkdiv = 255; } host->mode_reg = MCI_MR_CLKDIV(clkdiv) | MCI_MR_WRPROOF | MCI_MR_RDPROOF; } switch (ios->bus_width) { case MMC_BUS_WIDTH_1: host->sdc_reg = 0; break; case MMC_BUS_WIDTH_4: host->sdc_reg = MCI_SDCBUS_4BIT; break; } switch (ios->power_mode) { case MMC_POWER_ON: /* Send init sequence (74 clock cycles) */ atmci_enable(host); mci_writel(host, CMDR, MCI_CMDR_SPCMD_INIT); while (!(mci_readl(host, SR) & MCI_CMDRDY)) cpu_relax(); atmci_disable(host); break; default: /* * TODO: None of the currently available AVR32-based * boards allow MMC power to be turned off. Implement * power control when this can be tested properly. */ break; } } static int atmci_get_ro(struct mmc_host *mmc) { int read_only = 0; struct atmel_mci *host = mmc_priv(mmc); if (gpio_is_valid(host->wp_pin)) { read_only = gpio_get_value(host->wp_pin); dev_dbg(&mmc->class_dev, "card is %s\n", read_only ? "read-only" : "read-write"); } else { dev_dbg(&mmc->class_dev, "no pin for checking read-only switch." " Assuming write-enable.\n"); } return read_only; } static struct mmc_host_ops atmci_ops = { .request = atmci_request, .set_ios = atmci_set_ios, .get_ro = atmci_get_ro, }; static void atmci_command_complete(struct atmel_mci *host, struct mmc_command *cmd, u32 status) { /* Read the response from the card (up to 16 bytes) */ cmd->resp[0] = mci_readl(host, RSPR); cmd->resp[1] = mci_readl(host, RSPR); cmd->resp[2] = mci_readl(host, RSPR); cmd->resp[3] = mci_readl(host, RSPR); if (status & MCI_RTOE) cmd->error = -ETIMEDOUT; else if ((cmd->flags & MMC_RSP_CRC) && (status & MCI_RCRCE)) cmd->error = -EILSEQ; else if (status & (MCI_RINDE | MCI_RDIRE | MCI_RENDE)) cmd->error = -EIO; else cmd->error = 0; if (cmd->error) { dev_dbg(&host->mmc->class_dev, "command error: status=0x%08x\n", status); if (cmd->data) { host->data = NULL; mci_writel(host, IDR, MCI_NOTBUSY | MCI_TXRDY | MCI_RXRDY | ATMCI_DATA_ERROR_FLAGS); } } } static void atmci_detect_change(unsigned long data) { struct atmel_mci *host = (struct atmel_mci *)data; struct mmc_request *mrq = host->mrq; int present; /* * atmci_remove() sets detect_pin to -1 before freeing the * interrupt. We must not re-enable the interrupt if it has * been freed. */ smp_rmb(); if (!gpio_is_valid(host->detect_pin)) return; enable_irq(gpio_to_irq(host->detect_pin)); present = !gpio_get_value(host->detect_pin); dev_vdbg(&host->pdev->dev, "detect change: %d (was %d)\n", present, host->present); if (present != host->present) { dev_dbg(&host->mmc->class_dev, "card %s\n", present ? "inserted" : "removed"); host->present = present; /* Reset controller if card is gone */ if (!present) { mci_writel(host, CR, MCI_CR_SWRST); mci_writel(host, IDR, ~0UL); mci_writel(host, CR, MCI_CR_MCIEN); } /* Clean up queue if present */ if (mrq) { /* * Reset controller to terminate any ongoing * commands or data transfers. */ mci_writel(host, CR, MCI_CR_SWRST); if (!atmci_is_completed(host, EVENT_CMD_COMPLETE)) mrq->cmd->error = -ENOMEDIUM; if (mrq->data && !atmci_is_completed(host, EVENT_DATA_COMPLETE)) { host->data = NULL; mrq->data->error = -ENOMEDIUM; } if (mrq->stop && !atmci_is_completed(host, EVENT_STOP_COMPLETE)) mrq->stop->error = -ENOMEDIUM; host->cmd = NULL; atmci_request_end(host->mmc, mrq); } mmc_detect_change(host->mmc, 0); } } static void atmci_tasklet_func(unsigned long priv) { struct mmc_host *mmc = (struct mmc_host *)priv; struct atmel_mci *host = mmc_priv(mmc); struct mmc_request *mrq = host->mrq; struct mmc_data *data = host->data; dev_vdbg(&mmc->class_dev, "tasklet: pending/completed/mask %lx/%lx/%x\n", host->pending_events, host->completed_events, mci_readl(host, IMR)); if (atmci_test_and_clear_pending(host, EVENT_CMD_COMPLETE)) { /* * host->cmd must be set to NULL before the interrupt * handler sees EVENT_CMD_COMPLETE */ host->cmd = NULL; smp_wmb(); atmci_set_completed(host, EVENT_CMD_COMPLETE); atmci_command_complete(host, mrq->cmd, host->cmd_status); if (!mrq->cmd->error && mrq->stop && atmci_is_completed(host, EVENT_XFER_COMPLETE) && !atmci_test_and_set_completed(host, EVENT_STOP_SENT)) send_stop_cmd(host->mmc, mrq->data); } if (atmci_test_and_clear_pending(host, EVENT_STOP_COMPLETE)) { /* * host->cmd must be set to NULL before the interrupt * handler sees EVENT_STOP_COMPLETE */ host->cmd = NULL; smp_wmb(); atmci_set_completed(host, EVENT_STOP_COMPLETE); atmci_command_complete(host, mrq->stop, host->stop_status); } if (atmci_test_and_clear_pending(host, EVENT_DATA_ERROR)) { u32 status = host->data_status; dev_vdbg(&mmc->class_dev, "data error: status=%08x\n", status); atmci_set_completed(host, EVENT_DATA_ERROR); atmci_set_completed(host, EVENT_DATA_COMPLETE); if (status & MCI_DTOE) { dev_dbg(&mmc->class_dev, "data timeout error\n"); data->error = -ETIMEDOUT; } else if (status & MCI_DCRCE) { dev_dbg(&mmc->class_dev, "data CRC error\n"); data->error = -EILSEQ; } else { dev_dbg(&mmc->class_dev, "data FIFO error (status=%08x)\n", status); data->error = -EIO; } if (host->present && data->stop && atmci_is_completed(host, EVENT_CMD_COMPLETE) && !atmci_test_and_set_completed( host, EVENT_STOP_SENT)) send_stop_cmd(host->mmc, data); host->data = NULL; } if (atmci_test_and_clear_pending(host, EVENT_DATA_COMPLETE)) { atmci_set_completed(host, EVENT_DATA_COMPLETE); if (!atmci_is_completed(host, EVENT_DATA_ERROR)) { data->bytes_xfered = data->blocks * data->blksz; data->error = 0; } host->data = NULL; } if (host->mrq && !host->cmd && !host->data) atmci_request_end(mmc, host->mrq); } static void atmci_read_data_pio(struct atmel_mci *host) { struct scatterlist *sg = host->sg; void *buf = sg_virt(sg); unsigned int offset = host->pio_offset; struct mmc_data *data = host->data; u32 value; u32 status; unsigned int nbytes = 0; do { value = mci_readl(host, RDR); if (likely(offset + 4 <= sg->length)) { put_unaligned(value, (u32 *)(buf + offset)); offset += 4; nbytes += 4; if (offset == sg->length) { host->sg = sg = sg_next(sg); if (!sg) goto done; offset = 0; buf = sg_virt(sg); } } else { unsigned int remaining = sg->length - offset; memcpy(buf + offset, &value, remaining); nbytes += remaining; flush_dcache_page(sg_page(sg)); host->sg = sg = sg_next(sg); if (!sg) goto done; offset = 4 - remaining; buf = sg_virt(sg); memcpy(buf, (u8 *)&value + remaining, offset); nbytes += offset; } status = mci_readl(host, SR); if (status & ATMCI_DATA_ERROR_FLAGS) { mci_writel(host, IDR, (MCI_NOTBUSY | MCI_RXRDY | ATMCI_DATA_ERROR_FLAGS)); host->data_status = status; atmci_set_pending(host, EVENT_DATA_ERROR); tasklet_schedule(&host->tasklet); break; } } while (status & MCI_RXRDY); host->pio_offset = offset; data->bytes_xfered += nbytes; return; done: mci_writel(host, IDR, MCI_RXRDY); mci_writel(host, IER, MCI_NOTBUSY); data->bytes_xfered += nbytes; atmci_set_completed(host, EVENT_XFER_COMPLETE); if (data->stop && atmci_is_completed(host, EVENT_CMD_COMPLETE) && !atmci_test_and_set_completed(host, EVENT_STOP_SENT)) send_stop_cmd(host->mmc, data); } static void atmci_write_data_pio(struct atmel_mci *host) { struct scatterlist *sg = host->sg; void *buf = sg_virt(sg); unsigned int offset = host->pio_offset; struct mmc_data *data = host->data; u32 value; u32 status; unsigned int nbytes = 0; do { if (likely(offset + 4 <= sg->length)) { value = get_unaligned((u32 *)(buf + offset)); mci_writel(host, TDR, value); offset += 4; nbytes += 4; if (offset == sg->length) { host->sg = sg = sg_next(sg); if (!sg) goto done; offset = 0; buf = sg_virt(sg); } } else { unsigned int remaining = sg->length - offset; value = 0; memcpy(&value, buf + offset, remaining); nbytes += remaining; host->sg = sg = sg_next(sg); if (!sg) { mci_writel(host, TDR, value); goto done; } offset = 4 - remaining; buf = sg_virt(sg); memcpy((u8 *)&value + remaining, buf, offset); mci_writel(host, TDR, value); nbytes += offset; } status = mci_readl(host, SR); if (status & ATMCI_DATA_ERROR_FLAGS) { mci_writel(host, IDR, (MCI_NOTBUSY | MCI_TXRDY | ATMCI_DATA_ERROR_FLAGS)); host->data_status = status; atmci_set_pending(host, EVENT_DATA_ERROR); tasklet_schedule(&host->tasklet); break; } } while (status & MCI_TXRDY); host->pio_offset = offset; data->bytes_xfered += nbytes; return; done: mci_writel(host, IDR, MCI_TXRDY); mci_writel(host, IER, MCI_NOTBUSY); data->bytes_xfered += nbytes; atmci_set_completed(host, EVENT_XFER_COMPLETE); if (data->stop && atmci_is_completed(host, EVENT_CMD_COMPLETE) && !atmci_test_and_set_completed(host, EVENT_STOP_SENT)) send_stop_cmd(host->mmc, data); } static void atmci_cmd_interrupt(struct mmc_host *mmc, u32 status) { struct atmel_mci *host = mmc_priv(mmc); mci_writel(host, IDR, MCI_CMDRDY); if (atmci_is_completed(host, EVENT_STOP_SENT)) { host->stop_status = status; atmci_set_pending(host, EVENT_STOP_COMPLETE); } else { host->cmd_status = status; atmci_set_pending(host, EVENT_CMD_COMPLETE); } tasklet_schedule(&host->tasklet); } static irqreturn_t atmci_interrupt(int irq, void *dev_id) { struct mmc_host *mmc = dev_id; struct atmel_mci *host = mmc_priv(mmc); u32 status, mask, pending; unsigned int pass_count = 0; spin_lock(&mmc->lock); do { status = mci_readl(host, SR); mask = mci_readl(host, IMR); pending = status & mask; if (!pending) break; if (pending & ATMCI_DATA_ERROR_FLAGS) { mci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS | MCI_RXRDY | MCI_TXRDY); pending &= mci_readl(host, IMR); host->data_status = status; atmci_set_pending(host, EVENT_DATA_ERROR); tasklet_schedule(&host->tasklet); } if (pending & MCI_NOTBUSY) { mci_writel(host, IDR, (MCI_NOTBUSY | ATMCI_DATA_ERROR_FLAGS)); atmci_set_pending(host, EVENT_DATA_COMPLETE); tasklet_schedule(&host->tasklet); } if (pending & MCI_RXRDY) atmci_read_data_pio(host); if (pending & MCI_TXRDY) atmci_write_data_pio(host); if (pending & MCI_CMDRDY) atmci_cmd_interrupt(mmc, status); } while (pass_count++ < 5); spin_unlock(&mmc->lock); return pass_count ? IRQ_HANDLED : IRQ_NONE; } static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id) { struct mmc_host *mmc = dev_id; struct atmel_mci *host = mmc_priv(mmc); /* * Disable interrupts until the pin has stabilized and check * the state then. Use mod_timer() since we may be in the * middle of the timer routine when this interrupt triggers. */ disable_irq_nosync(irq); mod_timer(&host->detect_timer, jiffies + msecs_to_jiffies(20)); return IRQ_HANDLED; } static int __init atmci_probe(struct platform_device *pdev) { struct mci_platform_data *pdata; struct atmel_mci *host; struct mmc_host *mmc; struct resource *regs; int irq; int ret; regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!regs) return -ENXIO; pdata = pdev->dev.platform_data; if (!pdata) return -ENXIO; irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; mmc = mmc_alloc_host(sizeof(struct atmel_mci), &pdev->dev); if (!mmc) return -ENOMEM; host = mmc_priv(mmc); host->pdev = pdev; host->mmc = mmc; host->detect_pin = pdata->detect_pin; host->wp_pin = pdata->wp_pin; host->mck = clk_get(&pdev->dev, "mci_clk"); if (IS_ERR(host->mck)) { ret = PTR_ERR(host->mck); goto err_clk_get; } ret = -ENOMEM; host->regs = ioremap(regs->start, regs->end - regs->start + 1); if (!host->regs) goto err_ioremap; clk_enable(host->mck); mci_writel(host, CR, MCI_CR_SWRST); host->bus_hz = clk_get_rate(host->mck); clk_disable(host->mck); host->mapbase = regs->start; mmc->ops = &atmci_ops; mmc->f_min = (host->bus_hz + 511) / 512; mmc->f_max = host->bus_hz / 2; mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; mmc->caps |= MMC_CAP_4_BIT_DATA; mmc->max_hw_segs = 64; mmc->max_phys_segs = 64; mmc->max_req_size = 32768 * 512; mmc->max_blk_size = 32768; mmc->max_blk_count = 512; tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)mmc); ret = request_irq(irq, atmci_interrupt, 0, pdev->dev.bus_id, mmc); if (ret) goto err_request_irq; /* Assume card is present if we don't have a detect pin */ host->present = 1; if (gpio_is_valid(host->detect_pin)) { if (gpio_request(host->detect_pin, "mmc_detect")) { dev_dbg(&mmc->class_dev, "no detect pin available\n"); host->detect_pin = -1; } else { host->present = !gpio_get_value(host->detect_pin); } } if (gpio_is_valid(host->wp_pin)) { if (gpio_request(host->wp_pin, "mmc_wp")) { dev_dbg(&mmc->class_dev, "no WP pin available\n"); host->wp_pin = -1; } } platform_set_drvdata(pdev, host); mmc_add_host(mmc); if (gpio_is_valid(host->detect_pin)) { setup_timer(&host->detect_timer, atmci_detect_change, (unsigned long)host); ret = request_irq(gpio_to_irq(host->detect_pin), atmci_detect_interrupt, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, "mmc-detect", mmc); if (ret) { dev_dbg(&mmc->class_dev, "could not request IRQ %d for detect pin\n", gpio_to_irq(host->detect_pin)); gpio_free(host->detect_pin); host->detect_pin = -1; } } dev_info(&mmc->class_dev, "Atmel MCI controller at 0x%08lx irq %d\n", host->mapbase, irq); atmci_init_debugfs(host); return 0; err_request_irq: iounmap(host->regs); err_ioremap: clk_put(host->mck); err_clk_get: mmc_free_host(mmc); return ret; } static int __exit atmci_remove(struct platform_device *pdev) { struct atmel_mci *host = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); if (host) { /* Debugfs stuff is cleaned up by mmc core */ if (gpio_is_valid(host->detect_pin)) { int pin = host->detect_pin; /* Make sure the timer doesn't enable the interrupt */ host->detect_pin = -1; smp_wmb(); free_irq(gpio_to_irq(pin), host->mmc); del_timer_sync(&host->detect_timer); gpio_free(pin); } mmc_remove_host(host->mmc); clk_enable(host->mck); mci_writel(host, IDR, ~0UL); mci_writel(host, CR, MCI_CR_MCIDIS); mci_readl(host, SR); clk_disable(host->mck); if (gpio_is_valid(host->wp_pin)) gpio_free(host->wp_pin); free_irq(platform_get_irq(pdev, 0), host->mmc); iounmap(host->regs); clk_put(host->mck); mmc_free_host(host->mmc); } return 0; } static struct platform_driver atmci_driver = { .remove = __exit_p(atmci_remove), .driver = { .name = "atmel_mci", }, }; static int __init atmci_init(void) { return platform_driver_probe(&atmci_driver, atmci_probe); } static void __exit atmci_exit(void) { platform_driver_unregister(&atmci_driver); } module_init(atmci_init); module_exit(atmci_exit); MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver"); MODULE_AUTHOR("Haavard Skinnemoen <haavard.skinnemoen@atmel.com>"); MODULE_LICENSE("GPL v2");