diff options
Diffstat (limited to 'drivers/mmc/host/tmio_mmc.c')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc.c | 643 |
1 files changed, 66 insertions, 577 deletions
diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c index 7cccc852374..cfad844730d 100644 --- a/drivers/mmc/host/tmio_mmc.c +++ b/drivers/mmc/host/tmio_mmc.c @@ -1,8 +1,8 @@ /* - * linux/drivers/mmc/tmio_mmc.c + * linux/drivers/mmc/host/tmio_mmc.c * - * Copyright (C) 2004 Ian Molton - * Copyright (C) 2007 Ian Molton + * Copyright (C) 2007 Ian Molton + * Copyright (C) 2004 Ian Molton * * 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 @@ -11,623 +11,121 @@ * Driver for the MMC / SD / SDIO cell found in: * * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3 - * - * This driver draws mainly on scattered spec sheets, Reverse engineering - * of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit - * support). (Further 4 bit support from a later datasheet). - * - * TODO: - * Investigate using a workqueue for PIO transfers - * Eliminate FIXMEs - * SDIO support - * Better Power management - * Handle MMC errors better - * double buffer support - * */ -#include <linux/module.h> -#include <linux/irq.h> + #include <linux/device.h> -#include <linux/delay.h> -#include <linux/mmc/host.h> #include <linux/mfd/core.h> #include <linux/mfd/tmio.h> +#include <linux/mmc/host.h> +#include <linux/module.h> +#include <linux/pagemap.h> +#include <linux/scatterlist.h> #include "tmio_mmc.h" -static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock) -{ - u32 clk = 0, clock; - - if (new_clock) { - for (clock = host->mmc->f_min, clk = 0x80000080; - new_clock >= (clock<<1); clk >>= 1) - clock <<= 1; - clk |= 0x100; - } - - sd_config_write8(host, CNF_SD_CLK_MODE, clk >> 22); - sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff); -} - -static void tmio_mmc_clk_stop(struct tmio_mmc_host *host) -{ - sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000); - msleep(10); - sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~0x0100 & - sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); - msleep(10); -} - -static void tmio_mmc_clk_start(struct tmio_mmc_host *host) -{ - sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 | - sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); - msleep(10); - sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100); - msleep(10); -} - -static void reset(struct tmio_mmc_host *host) -{ - /* FIXME - should we set stop clock reg here */ - sd_ctrl_write16(host, CTL_RESET_SD, 0x0000); - sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000); - msleep(10); - sd_ctrl_write16(host, CTL_RESET_SD, 0x0001); - sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001); - msleep(10); -} - -static void -tmio_mmc_finish_request(struct tmio_mmc_host *host) -{ - struct mmc_request *mrq = host->mrq; - - host->mrq = NULL; - host->cmd = NULL; - host->data = NULL; - - mmc_request_done(host->mmc, mrq); -} - -/* These are the bitmasks the tmio chip requires to implement the MMC response - * types. Note that R1 and R6 are the same in this scheme. */ -#define APP_CMD 0x0040 -#define RESP_NONE 0x0300 -#define RESP_R1 0x0400 -#define RESP_R1B 0x0500 -#define RESP_R2 0x0600 -#define RESP_R3 0x0700 -#define DATA_PRESENT 0x0800 -#define TRANSFER_READ 0x1000 -#define TRANSFER_MULTI 0x2000 -#define SECURITY_CMD 0x4000 - -static int -tmio_mmc_start_command(struct tmio_mmc_host *host, struct mmc_command *cmd) -{ - struct mmc_data *data = host->data; - int c = cmd->opcode; - - /* Command 12 is handled by hardware */ - if (cmd->opcode == 12 && !cmd->arg) { - sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x001); - return 0; - } - - switch (mmc_resp_type(cmd)) { - case MMC_RSP_NONE: c |= RESP_NONE; break; - case MMC_RSP_R1: c |= RESP_R1; break; - case MMC_RSP_R1B: c |= RESP_R1B; break; - case MMC_RSP_R2: c |= RESP_R2; break; - case MMC_RSP_R3: c |= RESP_R3; break; - default: - pr_debug("Unknown response type %d\n", mmc_resp_type(cmd)); - return -EINVAL; - } - - host->cmd = cmd; - -/* FIXME - this seems to be ok comented out but the spec suggest this bit should - * be set when issuing app commands. - * if(cmd->flags & MMC_FLAG_ACMD) - * c |= APP_CMD; - */ - if (data) { - c |= DATA_PRESENT; - if (data->blocks > 1) { - sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x100); - c |= TRANSFER_MULTI; - } - if (data->flags & MMC_DATA_READ) - c |= TRANSFER_READ; - } - - enable_mmc_irqs(host, TMIO_MASK_CMD); - - /* Fire off the command */ - sd_ctrl_write32(host, CTL_ARG_REG, cmd->arg); - sd_ctrl_write16(host, CTL_SD_CMD, c); - - return 0; -} - -/* This chip always returns (at least?) as much data as you ask for. - * I'm unsure what happens if you ask for less than a block. This should be - * looked into to ensure that a funny length read doesnt hose the controller. - * - */ -static inline void tmio_mmc_pio_irq(struct tmio_mmc_host *host) -{ - struct mmc_data *data = host->data; - unsigned short *buf; - unsigned int count; - unsigned long flags; - - if (!data) { - pr_debug("Spurious PIO IRQ\n"); - return; - } - - buf = (unsigned short *)(tmio_mmc_kmap_atomic(host, &flags) + - host->sg_off); - - count = host->sg_ptr->length - host->sg_off; - if (count > data->blksz) - count = data->blksz; - - pr_debug("count: %08x offset: %08x flags %08x\n", - count, host->sg_off, data->flags); - - /* Transfer the data */ - if (data->flags & MMC_DATA_READ) - sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1); - else - sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1); - - host->sg_off += count; - - tmio_mmc_kunmap_atomic(host, &flags); - - if (host->sg_off == host->sg_ptr->length) - tmio_mmc_next_sg(host); - - return; -} - -static inline void tmio_mmc_data_irq(struct tmio_mmc_host *host) +#ifdef CONFIG_PM_SLEEP +static int tmio_mmc_suspend(struct device *dev) { - struct mmc_data *data = host->data; - struct mmc_command *stop; - - host->data = NULL; - - if (!data) { - pr_debug("Spurious data end IRQ\n"); - return; - } - stop = data->stop; - - /* FIXME - return correct transfer count on errors */ - if (!data->error) - data->bytes_xfered = data->blocks * data->blksz; - else - data->bytes_xfered = 0; - - pr_debug("Completed data request\n"); - - /*FIXME - other drivers allow an optional stop command of any given type - * which we dont do, as the chip can auto generate them. - * Perhaps we can be smarter about when to use auto CMD12 and - * only issue the auto request when we know this is the desired - * stop command, allowing fallback to the stop command the - * upper layers expect. For now, we do what works. - */ - - if (data->flags & MMC_DATA_READ) - disable_mmc_irqs(host, TMIO_MASK_READOP); - else - disable_mmc_irqs(host, TMIO_MASK_WRITEOP); - - if (stop) { - if (stop->opcode == 12 && !stop->arg) - sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0x000); - else - BUG(); - } - - tmio_mmc_finish_request(host); -} - -static inline void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, - unsigned int stat) -{ - struct mmc_command *cmd = host->cmd; - int i, addr; - - if (!host->cmd) { - pr_debug("Spurious CMD irq\n"); - return; - } - - host->cmd = NULL; - - /* This controller is sicker than the PXA one. Not only do we need to - * drop the top 8 bits of the first response word, we also need to - * modify the order of the response for short response command types. - */ - - for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4) - cmd->resp[i] = sd_ctrl_read32(host, addr); - - if (cmd->flags & MMC_RSP_136) { - cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24); - cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24); - cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24); - cmd->resp[3] <<= 8; - } else if (cmd->flags & MMC_RSP_R3) { - cmd->resp[0] = cmd->resp[3]; - } - - if (stat & TMIO_STAT_CMDTIMEOUT) - cmd->error = -ETIMEDOUT; - else if (stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC) - cmd->error = -EILSEQ; - - /* If there is data to handle we enable data IRQs here, and - * we will ultimatley finish the request in the data_end handler. - * If theres no data or we encountered an error, finish now. - */ - if (host->data && !cmd->error) { - if (host->data->flags & MMC_DATA_READ) - enable_mmc_irqs(host, TMIO_MASK_READOP); - else - enable_mmc_irqs(host, TMIO_MASK_WRITEOP); - } else { - tmio_mmc_finish_request(host); - } - - return; -} - - -static irqreturn_t tmio_mmc_irq(int irq, void *devid) -{ - struct tmio_mmc_host *host = devid; - unsigned int ireg, irq_mask, status; - - pr_debug("MMC IRQ begin\n"); - - status = sd_ctrl_read32(host, CTL_STATUS); - irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK); - ireg = status & TMIO_MASK_IRQ & ~irq_mask; - - pr_debug_status(status); - pr_debug_status(ireg); - - if (!ireg) { - disable_mmc_irqs(host, status & ~irq_mask); - - pr_debug("tmio_mmc: Spurious irq, disabling! " - "0x%08x 0x%08x 0x%08x\n", status, irq_mask, ireg); - pr_debug_status(status); - - goto out; - } - - while (ireg) { - /* Card insert / remove attempts */ - if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) { - ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT | - TMIO_STAT_CARD_REMOVE); - mmc_detect_change(host->mmc, 0); - } - - /* CRC and other errors */ -/* if (ireg & TMIO_STAT_ERR_IRQ) - * handled |= tmio_error_irq(host, irq, stat); - */ - - /* Command completion */ - if (ireg & TMIO_MASK_CMD) { - ack_mmc_irqs(host, TMIO_MASK_CMD); - tmio_mmc_cmd_irq(host, status); - } - - /* Data transfer */ - if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) { - ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ); - tmio_mmc_pio_irq(host); - } - - /* Data transfer completion */ - if (ireg & TMIO_STAT_DATAEND) { - ack_mmc_irqs(host, TMIO_STAT_DATAEND); - tmio_mmc_data_irq(host); - } - - /* Check status - keep going until we've handled it all */ - status = sd_ctrl_read32(host, CTL_STATUS); - irq_mask = sd_ctrl_read32(host, CTL_IRQ_MASK); - ireg = status & TMIO_MASK_IRQ & ~irq_mask; - - pr_debug("Status at end of loop: %08x\n", status); - pr_debug_status(status); - } - pr_debug("MMC IRQ end\n"); - -out: - return IRQ_HANDLED; -} - -static int tmio_mmc_start_data(struct tmio_mmc_host *host, - struct mmc_data *data) -{ - pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n", - data->blksz, data->blocks); - - /* Hardware cannot perform 1 and 2 byte requests in 4 bit mode */ - if (data->blksz < 4 && host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) { - printk(KERN_ERR "%s: %d byte block unsupported in 4 bit mode\n", - mmc_hostname(host->mmc), data->blksz); - return -EINVAL; - } - - tmio_mmc_init_sg(host, data); - host->data = data; - - /* Set transfer length / blocksize */ - sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz); - sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks); - - return 0; -} - -/* Process requests from the MMC layer */ -static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) -{ - struct tmio_mmc_host *host = mmc_priv(mmc); + struct platform_device *pdev = to_platform_device(dev); + const struct mfd_cell *cell = mfd_get_cell(pdev); int ret; - if (host->mrq) - pr_debug("request not null\n"); - - host->mrq = mrq; - - if (mrq->data) { - ret = tmio_mmc_start_data(host, mrq->data); - if (ret) - goto fail; - } - - ret = tmio_mmc_start_command(host, mrq->cmd); - - if (!ret) - return; - -fail: - mrq->cmd->error = ret; - mmc_request_done(mmc, mrq); -} - -/* Set MMC clock / power. - * Note: This controller uses a simple divider scheme therefore it cannot - * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as - * MMC wont run that fast, it has to be clocked at 12MHz which is the next - * slowest setting. - */ -static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) -{ - struct tmio_mmc_host *host = mmc_priv(mmc); - - if (ios->clock) - tmio_mmc_set_clock(host, ios->clock); - - /* Power sequence - OFF -> ON -> UP */ - switch (ios->power_mode) { - case MMC_POWER_OFF: /* power down SD bus */ - sd_config_write8(host, CNF_PWR_CTL_2, 0x00); - tmio_mmc_clk_stop(host); - break; - case MMC_POWER_ON: /* power up SD bus */ - - sd_config_write8(host, CNF_PWR_CTL_2, 0x02); - break; - case MMC_POWER_UP: /* start bus clock */ - tmio_mmc_clk_start(host); - break; - } - - switch (ios->bus_width) { - case MMC_BUS_WIDTH_1: - sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x80e0); - break; - case MMC_BUS_WIDTH_4: - sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, 0x00e0); - break; - } - - /* Let things settle. delay taken from winCE driver */ - udelay(140); -} - -static int tmio_mmc_get_ro(struct mmc_host *mmc) -{ - struct tmio_mmc_host *host = mmc_priv(mmc); - - return (sd_ctrl_read16(host, CTL_STATUS) & TMIO_STAT_WRPROTECT) ? 0 : 1; -} - -static struct mmc_host_ops tmio_mmc_ops = { - .request = tmio_mmc_request, - .set_ios = tmio_mmc_set_ios, - .get_ro = tmio_mmc_get_ro, -}; - -#ifdef CONFIG_PM -static int tmio_mmc_suspend(struct platform_device *dev, pm_message_t state) -{ - struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data; - struct mmc_host *mmc = platform_get_drvdata(dev); - int ret; - - ret = mmc_suspend_host(mmc, state); + ret = tmio_mmc_host_suspend(dev); /* Tell MFD core it can disable us now.*/ if (!ret && cell->disable) - cell->disable(dev); + cell->disable(pdev); return ret; } -static int tmio_mmc_resume(struct platform_device *dev) +static int tmio_mmc_resume(struct device *dev) { - struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data; - struct mmc_host *mmc = platform_get_drvdata(dev); - struct tmio_mmc_host *host = mmc_priv(mmc); + struct platform_device *pdev = to_platform_device(dev); + const struct mfd_cell *cell = mfd_get_cell(pdev); int ret = 0; /* Tell the MFD core we are ready to be enabled */ - if (cell->enable) { - ret = cell->enable(dev); - if (ret) - goto out; - } - - /* Enable the MMC/SD Control registers */ - sd_config_write16(host, CNF_CMD, SDCREN); - sd_config_write32(host, CNF_CTL_BASE, - (dev->resource[0].start >> host->bus_shift) & 0xfffe); + if (cell->resume) + ret = cell->resume(pdev); - mmc_resume_host(mmc); + if (!ret) + ret = tmio_mmc_host_resume(dev); -out: return ret; } -#else -#define tmio_mmc_suspend NULL -#define tmio_mmc_resume NULL #endif -static int __devinit tmio_mmc_probe(struct platform_device *dev) +static int tmio_mmc_probe(struct platform_device *pdev) { - struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data; + const struct mfd_cell *cell = mfd_get_cell(pdev); struct tmio_mmc_data *pdata; - struct resource *res_ctl, *res_cnf; struct tmio_mmc_host *host; - struct mmc_host *mmc; - int ret = -EINVAL; - - if (dev->num_resources != 3) - goto out; + struct resource *res; + int ret = -EINVAL, irq; - res_ctl = platform_get_resource(dev, IORESOURCE_MEM, 0); - res_cnf = platform_get_resource(dev, IORESOURCE_MEM, 1); - if (!res_ctl || !res_cnf) + if (pdev->num_resources != 2) goto out; - pdata = cell->driver_data; + pdata = pdev->dev.platform_data; if (!pdata || !pdata->hclk) goto out; - ret = -ENOMEM; - - mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &dev->dev); - if (!mmc) + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; goto out; - - host = mmc_priv(mmc); - host->mmc = mmc; - platform_set_drvdata(dev, mmc); - - /* SD control register space size is 0x200, 0x400 for bus_shift=1 */ - host->bus_shift = resource_size(res_ctl) >> 10; - - host->ctl = ioremap(res_ctl->start, resource_size(res_ctl)); - if (!host->ctl) - goto host_free; - - host->cnf = ioremap(res_cnf->start, resource_size(res_cnf)); - if (!host->cnf) - goto unmap_ctl; - - mmc->ops = &tmio_mmc_ops; - mmc->caps = MMC_CAP_4_BIT_DATA; - mmc->f_max = pdata->hclk; - mmc->f_min = mmc->f_max / 512; - mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; + } /* Tell the MFD core we are ready to be enabled */ if (cell->enable) { - ret = cell->enable(dev); + ret = cell->enable(pdev); if (ret) - goto unmap_cnf; + goto out; } - /* Enable the MMC/SD Control registers */ - sd_config_write16(host, CNF_CMD, SDCREN); - sd_config_write32(host, CNF_CTL_BASE, - (dev->resource[0].start >> host->bus_shift) & 0xfffe); - - /* Disable SD power during suspend */ - sd_config_write8(host, CNF_PWR_CTL_3, 0x01); - - /* The below is required but why? FIXME */ - sd_config_write8(host, CNF_STOP_CLK_CTL, 0x1f); - - /* Power down SD bus*/ - sd_config_write8(host, CNF_PWR_CTL_2, 0x00); - - tmio_mmc_clk_stop(host); - reset(host); - - ret = platform_get_irq(dev, 0); - if (ret >= 0) - host->irq = ret; - else - goto unmap_cnf; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; - disable_mmc_irqs(host, TMIO_MASK_ALL); + /* SD control register space size is 0x200, 0x400 for bus_shift=1 */ + pdata->bus_shift = resource_size(res) >> 10; + pdata->flags |= TMIO_MMC_HAVE_HIGH_REG; - ret = request_irq(host->irq, tmio_mmc_irq, IRQF_DISABLED | - IRQF_TRIGGER_FALLING, dev_name(&dev->dev), host); + ret = tmio_mmc_host_probe(&host, pdev, pdata); if (ret) - goto unmap_cnf; - - mmc_add_host(mmc); + goto cell_disable; - printk(KERN_INFO "%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc), - (unsigned long)host->ctl, host->irq); + ret = request_irq(irq, tmio_mmc_irq, IRQF_TRIGGER_FALLING, + dev_name(&pdev->dev), host); + if (ret) + goto host_remove; - /* Unmask the IRQs we want to know about */ - enable_mmc_irqs(host, TMIO_MASK_IRQ); + pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc), + (unsigned long)host->ctl, irq); return 0; -unmap_cnf: - iounmap(host->cnf); -unmap_ctl: - iounmap(host->ctl); -host_free: - mmc_free_host(mmc); +host_remove: + tmio_mmc_host_remove(host); +cell_disable: + if (cell->disable) + cell->disable(pdev); out: return ret; } -static int __devexit tmio_mmc_remove(struct platform_device *dev) +static int tmio_mmc_remove(struct platform_device *pdev) { - struct mmc_host *mmc = platform_get_drvdata(dev); - - platform_set_drvdata(dev, NULL); + const struct mfd_cell *cell = mfd_get_cell(pdev); + struct mmc_host *mmc = platform_get_drvdata(pdev); if (mmc) { struct tmio_mmc_host *host = mmc_priv(mmc); - mmc_remove_host(mmc); - free_irq(host->irq, host); - iounmap(host->ctl); - iounmap(host->cnf); - mmc_free_host(mmc); + free_irq(platform_get_irq(pdev, 0), host); + tmio_mmc_host_remove(host); + if (cell->disable) + cell->disable(pdev); } return 0; @@ -635,30 +133,21 @@ static int __devexit tmio_mmc_remove(struct platform_device *dev) /* ------------------- device registration ----------------------- */ +static const struct dev_pm_ops tmio_mmc_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume) +}; + static struct platform_driver tmio_mmc_driver = { .driver = { .name = "tmio-mmc", .owner = THIS_MODULE, + .pm = &tmio_mmc_dev_pm_ops, }, .probe = tmio_mmc_probe, - .remove = __devexit_p(tmio_mmc_remove), - .suspend = tmio_mmc_suspend, - .resume = tmio_mmc_resume, + .remove = tmio_mmc_remove, }; - -static int __init tmio_mmc_init(void) -{ - return platform_driver_register(&tmio_mmc_driver); -} - -static void __exit tmio_mmc_exit(void) -{ - platform_driver_unregister(&tmio_mmc_driver); -} - -module_init(tmio_mmc_init); -module_exit(tmio_mmc_exit); +module_platform_driver(tmio_mmc_driver); MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver"); MODULE_AUTHOR("Ian Molton <spyro@f2s.com>"); |