diff options
Diffstat (limited to 'drivers/mmc/host/tmio_mmc.c')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc.c | 1285 |
1 files changed, 18 insertions, 1267 deletions
diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c index ab1adeabdd2..79c568461d5 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 @@ -11,1182 +11,17 @@ * 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/delay.h> #include <linux/device.h> -#include <linux/dmaengine.h> -#include <linux/highmem.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/irq.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 <linux/workqueue.h> -#include <linux/spinlock.h> - -#define CTL_SD_CMD 0x00 -#define CTL_ARG_REG 0x04 -#define CTL_STOP_INTERNAL_ACTION 0x08 -#define CTL_XFER_BLK_COUNT 0xa -#define CTL_RESPONSE 0x0c -#define CTL_STATUS 0x1c -#define CTL_IRQ_MASK 0x20 -#define CTL_SD_CARD_CLK_CTL 0x24 -#define CTL_SD_XFER_LEN 0x26 -#define CTL_SD_MEM_CARD_OPT 0x28 -#define CTL_SD_ERROR_DETAIL_STATUS 0x2c -#define CTL_SD_DATA_PORT 0x30 -#define CTL_TRANSACTION_CTL 0x34 -#define CTL_SDIO_STATUS 0x36 -#define CTL_SDIO_IRQ_MASK 0x38 -#define CTL_RESET_SD 0xe0 -#define CTL_SDIO_REGS 0x100 -#define CTL_CLK_AND_WAIT_CTL 0x138 -#define CTL_RESET_SDIO 0x1e0 - -/* Definitions for values the CTRL_STATUS register can take. */ -#define TMIO_STAT_CMDRESPEND 0x00000001 -#define TMIO_STAT_DATAEND 0x00000004 -#define TMIO_STAT_CARD_REMOVE 0x00000008 -#define TMIO_STAT_CARD_INSERT 0x00000010 -#define TMIO_STAT_SIGSTATE 0x00000020 -#define TMIO_STAT_WRPROTECT 0x00000080 -#define TMIO_STAT_CARD_REMOVE_A 0x00000100 -#define TMIO_STAT_CARD_INSERT_A 0x00000200 -#define TMIO_STAT_SIGSTATE_A 0x00000400 -#define TMIO_STAT_CMD_IDX_ERR 0x00010000 -#define TMIO_STAT_CRCFAIL 0x00020000 -#define TMIO_STAT_STOPBIT_ERR 0x00040000 -#define TMIO_STAT_DATATIMEOUT 0x00080000 -#define TMIO_STAT_RXOVERFLOW 0x00100000 -#define TMIO_STAT_TXUNDERRUN 0x00200000 -#define TMIO_STAT_CMDTIMEOUT 0x00400000 -#define TMIO_STAT_RXRDY 0x01000000 -#define TMIO_STAT_TXRQ 0x02000000 -#define TMIO_STAT_ILL_FUNC 0x20000000 -#define TMIO_STAT_CMD_BUSY 0x40000000 -#define TMIO_STAT_ILL_ACCESS 0x80000000 - -/* Definitions for values the CTRL_SDIO_STATUS register can take. */ -#define TMIO_SDIO_STAT_IOIRQ 0x0001 -#define TMIO_SDIO_STAT_EXPUB52 0x4000 -#define TMIO_SDIO_STAT_EXWT 0x8000 -#define TMIO_SDIO_MASK_ALL 0xc007 - -/* Define some IRQ masks */ -/* This is the mask used at reset by the chip */ -#define TMIO_MASK_ALL 0x837f031d -#define TMIO_MASK_READOP (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND) -#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND) -#define TMIO_MASK_CMD (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \ - TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT) -#define TMIO_MASK_IRQ (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD) - -#define enable_mmc_irqs(host, i) \ - do { \ - u32 mask;\ - mask = sd_ctrl_read32((host), CTL_IRQ_MASK); \ - mask &= ~((i) & TMIO_MASK_IRQ); \ - sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \ - } while (0) - -#define disable_mmc_irqs(host, i) \ - do { \ - u32 mask;\ - mask = sd_ctrl_read32((host), CTL_IRQ_MASK); \ - mask |= ((i) & TMIO_MASK_IRQ); \ - sd_ctrl_write32((host), CTL_IRQ_MASK, mask); \ - } while (0) - -#define ack_mmc_irqs(host, i) \ - do { \ - sd_ctrl_write32((host), CTL_STATUS, ~(i)); \ - } while (0) - -/* This is arbitrary, just noone needed any higher alignment yet */ -#define MAX_ALIGN 4 - -struct tmio_mmc_host { - void __iomem *ctl; - unsigned long bus_shift; - struct mmc_command *cmd; - struct mmc_request *mrq; - struct mmc_data *data; - struct mmc_host *mmc; - int irq; - unsigned int sdio_irq_enabled; - - /* Callbacks for clock / power control */ - void (*set_pwr)(struct platform_device *host, int state); - void (*set_clk_div)(struct platform_device *host, int state); - - /* pio related stuff */ - struct scatterlist *sg_ptr; - struct scatterlist *sg_orig; - unsigned int sg_len; - unsigned int sg_off; - - struct platform_device *pdev; - - /* DMA support */ - struct dma_chan *chan_rx; - struct dma_chan *chan_tx; - struct tasklet_struct dma_complete; - struct tasklet_struct dma_issue; -#ifdef CONFIG_TMIO_MMC_DMA - u8 bounce_buf[PAGE_CACHE_SIZE] __attribute__((aligned(MAX_ALIGN))); - struct scatterlist bounce_sg; -#endif - - /* Track lost interrupts */ - struct delayed_work delayed_reset_work; - spinlock_t lock; - unsigned long last_req_ts; -}; - -static void tmio_check_bounce_buffer(struct tmio_mmc_host *host); - -static u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr) -{ - return readw(host->ctl + (addr << host->bus_shift)); -} - -static void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr, - u16 *buf, int count) -{ - readsw(host->ctl + (addr << host->bus_shift), buf, count); -} - -static u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr) -{ - return readw(host->ctl + (addr << host->bus_shift)) | - readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16; -} - -static void sd_ctrl_write16(struct tmio_mmc_host *host, int addr, u16 val) -{ - writew(val, host->ctl + (addr << host->bus_shift)); -} - -static void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr, - u16 *buf, int count) -{ - writesw(host->ctl + (addr << host->bus_shift), buf, count); -} - -static void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val) -{ - writew(val, host->ctl + (addr << host->bus_shift)); - writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift)); -} - -static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data) -{ - host->sg_len = data->sg_len; - host->sg_ptr = data->sg; - host->sg_orig = data->sg; - host->sg_off = 0; -} - -static int tmio_mmc_next_sg(struct tmio_mmc_host *host) -{ - host->sg_ptr = sg_next(host->sg_ptr); - host->sg_off = 0; - return --host->sg_len; -} - -static char *tmio_mmc_kmap_atomic(struct scatterlist *sg, unsigned long *flags) -{ - local_irq_save(*flags); - return kmap_atomic(sg_page(sg), KM_BIO_SRC_IRQ) + sg->offset; -} - -static void tmio_mmc_kunmap_atomic(struct scatterlist *sg, unsigned long *flags, void *virt) -{ - kunmap_atomic(virt - sg->offset, KM_BIO_SRC_IRQ); - local_irq_restore(*flags); -} - -#ifdef CONFIG_MMC_DEBUG - -#define STATUS_TO_TEXT(a, status, i) \ - do { \ - if (status & TMIO_STAT_##a) { \ - if (i++) \ - printk(" | "); \ - printk(#a); \ - } \ - } while (0) - -void pr_debug_status(u32 status) -{ - int i = 0; - printk(KERN_DEBUG "status: %08x = ", status); - STATUS_TO_TEXT(CARD_REMOVE, status, i); - STATUS_TO_TEXT(CARD_INSERT, status, i); - STATUS_TO_TEXT(SIGSTATE, status, i); - STATUS_TO_TEXT(WRPROTECT, status, i); - STATUS_TO_TEXT(CARD_REMOVE_A, status, i); - STATUS_TO_TEXT(CARD_INSERT_A, status, i); - STATUS_TO_TEXT(SIGSTATE_A, status, i); - STATUS_TO_TEXT(CMD_IDX_ERR, status, i); - STATUS_TO_TEXT(STOPBIT_ERR, status, i); - STATUS_TO_TEXT(ILL_FUNC, status, i); - STATUS_TO_TEXT(CMD_BUSY, status, i); - STATUS_TO_TEXT(CMDRESPEND, status, i); - STATUS_TO_TEXT(DATAEND, status, i); - STATUS_TO_TEXT(CRCFAIL, status, i); - STATUS_TO_TEXT(DATATIMEOUT, status, i); - STATUS_TO_TEXT(CMDTIMEOUT, status, i); - STATUS_TO_TEXT(RXOVERFLOW, status, i); - STATUS_TO_TEXT(TXUNDERRUN, status, i); - STATUS_TO_TEXT(RXRDY, status, i); - STATUS_TO_TEXT(TXRQ, status, i); - STATUS_TO_TEXT(ILL_ACCESS, status, i); - printk("\n"); -} - -#else -#define pr_debug_status(s) do { } while (0) -#endif - -static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) -{ - struct tmio_mmc_host *host = mmc_priv(mmc); - - if (enable) { - host->sdio_irq_enabled = 1; - sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001); - sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, - (TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ)); - } else { - sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, TMIO_SDIO_MASK_ALL); - sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000); - host->sdio_irq_enabled = 0; - } -} - -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; - } - - if (host->set_clk_div) - host->set_clk_div(host->pdev, (clk>>22) & 1); - - sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & 0x1ff); -} - -static void tmio_mmc_clk_stop(struct tmio_mmc_host *host) -{ - struct tmio_mmc_data *pdata = mfd_get_data(host->pdev); - - /* - * Testing on sh-mobile showed that SDIO IRQs are unmasked when - * CTL_CLK_AND_WAIT_CTL gets written, so we have to disable the - * device IRQ here and restore the SDIO IRQ mask before - * re-enabling the device IRQ. - */ - if (pdata->flags & TMIO_MMC_SDIO_IRQ) - disable_irq(host->irq); - sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000); - msleep(10); - if (pdata->flags & TMIO_MMC_SDIO_IRQ) { - tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled); - enable_irq(host->irq); - } - 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) -{ - struct tmio_mmc_data *pdata = mfd_get_data(host->pdev); - - sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, 0x0100 | - sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); - msleep(10); - /* see comment in tmio_mmc_clk_stop above */ - if (pdata->flags & TMIO_MMC_SDIO_IRQ) - disable_irq(host->irq); - sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100); - msleep(10); - if (pdata->flags & TMIO_MMC_SDIO_IRQ) { - tmio_mmc_enable_sdio_irq(host->mmc, host->sdio_irq_enabled); - enable_irq(host->irq); - } -} - -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_reset_work(struct work_struct *work) -{ - struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host, - delayed_reset_work.work); - struct mmc_request *mrq; - unsigned long flags; - - spin_lock_irqsave(&host->lock, flags); - mrq = host->mrq; - - /* request already finished */ - if (!mrq - || time_is_after_jiffies(host->last_req_ts + - msecs_to_jiffies(2000))) { - spin_unlock_irqrestore(&host->lock, flags); - return; - } - - dev_warn(&host->pdev->dev, - "timeout waiting for hardware interrupt (CMD%u)\n", - mrq->cmd->opcode); - - if (host->data) - host->data->error = -ETIMEDOUT; - else if (host->cmd) - host->cmd->error = -ETIMEDOUT; - else - mrq->cmd->error = -ETIMEDOUT; - - host->cmd = NULL; - host->data = NULL; - host->mrq = NULL; - - spin_unlock_irqrestore(&host->lock, flags); - - reset(host); - - mmc_request_done(host->mmc, mrq); -} - -static void -tmio_mmc_finish_request(struct tmio_mmc_host *host) -{ - struct mmc_request *mrq = host->mrq; - - if (!mrq) - return; - - host->mrq = NULL; - host->cmd = NULL; - host->data = NULL; - - cancel_delayed_work(&host->delayed_reset_work); - - 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 commented 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 void tmio_mmc_pio_irq(struct tmio_mmc_host *host) -{ - struct mmc_data *data = host->data; - void *sg_virt; - unsigned short *buf; - unsigned int count; - unsigned long flags; - - if (!data) { - pr_debug("Spurious PIO IRQ\n"); - return; - } - - sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags); - buf = (unsigned short *)(sg_virt + 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->sg_ptr, &flags, sg_virt); - - if (host->sg_off == host->sg_ptr->length) - tmio_mmc_next_sg(host); - - return; -} - -/* needs to be called with host->lock held */ -static void tmio_mmc_do_data_irq(struct tmio_mmc_host *host) -{ - struct mmc_data *data = host->data; - struct mmc_command *stop; - - host->data = NULL; - - if (!data) { - dev_warn(&host->pdev->dev, "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) { - if (!host->chan_rx) - disable_mmc_irqs(host, TMIO_MASK_READOP); - else - tmio_check_bounce_buffer(host); - dev_dbg(&host->pdev->dev, "Complete Rx request %p\n", - host->mrq); - } else { - if (!host->chan_tx) - disable_mmc_irqs(host, TMIO_MASK_WRITEOP); - dev_dbg(&host->pdev->dev, "Complete Tx request %p\n", - host->mrq); - } - - 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 void tmio_mmc_data_irq(struct tmio_mmc_host *host) -{ - struct mmc_data *data; - spin_lock(&host->lock); - data = host->data; - - if (!data) - goto out; - - if (host->chan_tx && (data->flags & MMC_DATA_WRITE)) { - /* - * Has all data been written out yet? Testing on SuperH showed, - * that in most cases the first interrupt comes already with the - * BUSY status bit clear, but on some operations, like mount or - * in the beginning of a write / sync / umount, there is one - * DATAEND interrupt with the BUSY bit set, in this cases - * waiting for one more interrupt fixes the problem. - */ - if (!(sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_CMD_BUSY)) { - disable_mmc_irqs(host, TMIO_STAT_DATAEND); - tasklet_schedule(&host->dma_complete); - } - } else if (host->chan_rx && (data->flags & MMC_DATA_READ)) { - disable_mmc_irqs(host, TMIO_STAT_DATAEND); - tasklet_schedule(&host->dma_complete); - } else { - tmio_mmc_do_data_irq(host); - } -out: - spin_unlock(&host->lock); -} - -static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, - unsigned int stat) -{ - struct mmc_command *cmd = host->cmd; - int i, addr; - - spin_lock(&host->lock); - - if (!host->cmd) { - pr_debug("Spurious CMD irq\n"); - goto out; - } - - 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) { - if (!host->chan_rx) - enable_mmc_irqs(host, TMIO_MASK_READOP); - } else { - if (!host->chan_tx) - enable_mmc_irqs(host, TMIO_MASK_WRITEOP); - else - tasklet_schedule(&host->dma_issue); - } - } else { - tmio_mmc_finish_request(host); - } - -out: - spin_unlock(&host->lock); - - return; -} - -static irqreturn_t tmio_mmc_irq(int irq, void *devid) -{ - struct tmio_mmc_host *host = devid; - struct tmio_mmc_data *pdata = mfd_get_data(host->pdev); - unsigned int ireg, irq_mask, status; - unsigned int sdio_ireg, sdio_irq_mask, sdio_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; - - sdio_ireg = 0; - if (!ireg && pdata->flags & TMIO_MMC_SDIO_IRQ) { - sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS); - sdio_irq_mask = sd_ctrl_read16(host, CTL_SDIO_IRQ_MASK); - sdio_ireg = sdio_status & TMIO_SDIO_MASK_ALL & ~sdio_irq_mask; - - sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status & ~TMIO_SDIO_MASK_ALL); - - if (sdio_ireg && !host->sdio_irq_enabled) { - pr_warning("tmio_mmc: Spurious SDIO IRQ, disabling! 0x%04x 0x%04x 0x%04x\n", - sdio_status, sdio_irq_mask, sdio_ireg); - tmio_mmc_enable_sdio_irq(host->mmc, 0); - goto out; - } - if (host->mmc->caps & MMC_CAP_SDIO_IRQ && - sdio_ireg & TMIO_SDIO_STAT_IOIRQ) - mmc_signal_sdio_irq(host->mmc); - - if (sdio_ireg) - goto out; - } - - pr_debug_status(status); - pr_debug_status(ireg); - - if (!ireg) { - disable_mmc_irqs(host, status & ~irq_mask); - - pr_warning("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, msecs_to_jiffies(100)); - } - - /* CRC and other errors */ -/* if (ireg & TMIO_STAT_ERR_IRQ) - * handled |= tmio_error_irq(host, irq, stat); - */ - - /* Command completion */ - if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) { - ack_mmc_irqs(host, - TMIO_STAT_CMDRESPEND | - TMIO_STAT_CMDTIMEOUT); - 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; -} - -#ifdef CONFIG_TMIO_MMC_DMA -static void tmio_check_bounce_buffer(struct tmio_mmc_host *host) -{ - if (host->sg_ptr == &host->bounce_sg) { - unsigned long flags; - void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags); - memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length); - tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr); - } -} - -static void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable) -{ -#if defined(CONFIG_SUPERH) || defined(CONFIG_ARCH_SHMOBILE) - /* Switch DMA mode on or off - SuperH specific? */ - sd_ctrl_write16(host, 0xd8, enable ? 2 : 0); -#endif -} - -static void tmio_dma_complete(void *arg) -{ - struct tmio_mmc_host *host = arg; - - dev_dbg(&host->pdev->dev, "Command completed\n"); - - if (!host->data) - dev_warn(&host->pdev->dev, "NULL data in DMA completion!\n"); - else - enable_mmc_irqs(host, TMIO_STAT_DATAEND); -} - -static void tmio_mmc_start_dma_rx(struct tmio_mmc_host *host) -{ - struct scatterlist *sg = host->sg_ptr, *sg_tmp; - struct dma_async_tx_descriptor *desc = NULL; - struct dma_chan *chan = host->chan_rx; - struct tmio_mmc_data *pdata = mfd_get_data(host->pdev); - dma_cookie_t cookie; - int ret, i; - bool aligned = true, multiple = true; - unsigned int align = (1 << pdata->dma->alignment_shift) - 1; - - for_each_sg(sg, sg_tmp, host->sg_len, i) { - if (sg_tmp->offset & align) - aligned = false; - if (sg_tmp->length & align) { - multiple = false; - break; - } - } - - if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_CACHE_SIZE || - align >= MAX_ALIGN)) || !multiple) { - ret = -EINVAL; - goto pio; - } - - /* The only sg element can be unaligned, use our bounce buffer then */ - if (!aligned) { - sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length); - host->sg_ptr = &host->bounce_sg; - sg = host->sg_ptr; - } - - ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE); - if (ret > 0) - desc = chan->device->device_prep_slave_sg(chan, sg, ret, - DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - - if (desc) { - desc->callback = tmio_dma_complete; - desc->callback_param = host; - cookie = dmaengine_submit(desc); - dma_async_issue_pending(chan); - } - dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n", - __func__, host->sg_len, ret, cookie, host->mrq); - -pio: - if (!desc) { - /* DMA failed, fall back to PIO */ - if (ret >= 0) - ret = -EIO; - host->chan_rx = NULL; - dma_release_channel(chan); - /* Free the Tx channel too */ - chan = host->chan_tx; - if (chan) { - host->chan_tx = NULL; - dma_release_channel(chan); - } - dev_warn(&host->pdev->dev, - "DMA failed: %d, falling back to PIO\n", ret); - tmio_mmc_enable_dma(host, false); - } - - dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__, - desc, cookie, host->sg_len); -} - -static void tmio_mmc_start_dma_tx(struct tmio_mmc_host *host) -{ - struct scatterlist *sg = host->sg_ptr, *sg_tmp; - struct dma_async_tx_descriptor *desc = NULL; - struct dma_chan *chan = host->chan_tx; - struct tmio_mmc_data *pdata = mfd_get_data(host->pdev); - dma_cookie_t cookie; - int ret, i; - bool aligned = true, multiple = true; - unsigned int align = (1 << pdata->dma->alignment_shift) - 1; - - for_each_sg(sg, sg_tmp, host->sg_len, i) { - if (sg_tmp->offset & align) - aligned = false; - if (sg_tmp->length & align) { - multiple = false; - break; - } - } - - if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_CACHE_SIZE || - align >= MAX_ALIGN)) || !multiple) { - ret = -EINVAL; - goto pio; - } - - /* The only sg element can be unaligned, use our bounce buffer then */ - if (!aligned) { - unsigned long flags; - void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags); - sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length); - memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length); - tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr); - host->sg_ptr = &host->bounce_sg; - sg = host->sg_ptr; - } - - ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE); - if (ret > 0) - desc = chan->device->device_prep_slave_sg(chan, sg, ret, - DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - - if (desc) { - desc->callback = tmio_dma_complete; - desc->callback_param = host; - cookie = dmaengine_submit(desc); - } - dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n", - __func__, host->sg_len, ret, cookie, host->mrq); - -pio: - if (!desc) { - /* DMA failed, fall back to PIO */ - if (ret >= 0) - ret = -EIO; - host->chan_tx = NULL; - dma_release_channel(chan); - /* Free the Rx channel too */ - chan = host->chan_rx; - if (chan) { - host->chan_rx = NULL; - dma_release_channel(chan); - } - dev_warn(&host->pdev->dev, - "DMA failed: %d, falling back to PIO\n", ret); - tmio_mmc_enable_dma(host, false); - } - - dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d\n", __func__, - desc, cookie); -} - -static void tmio_mmc_start_dma(struct tmio_mmc_host *host, - struct mmc_data *data) -{ - if (data->flags & MMC_DATA_READ) { - if (host->chan_rx) - tmio_mmc_start_dma_rx(host); - } else { - if (host->chan_tx) - tmio_mmc_start_dma_tx(host); - } -} - -static void tmio_issue_tasklet_fn(unsigned long priv) -{ - struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv; - struct dma_chan *chan = host->chan_tx; - - dma_async_issue_pending(chan); -} - -static void tmio_tasklet_fn(unsigned long arg) -{ - struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg; - unsigned long flags; - - spin_lock_irqsave(&host->lock, flags); - - if (!host->data) - goto out; - - if (host->data->flags & MMC_DATA_READ) - dma_unmap_sg(host->chan_rx->device->dev, - host->sg_ptr, host->sg_len, - DMA_FROM_DEVICE); - else - dma_unmap_sg(host->chan_tx->device->dev, - host->sg_ptr, host->sg_len, - DMA_TO_DEVICE); - - tmio_mmc_do_data_irq(host); -out: - spin_unlock_irqrestore(&host->lock, flags); -} - -/* It might be necessary to make filter MFD specific */ -static bool tmio_mmc_filter(struct dma_chan *chan, void *arg) -{ - dev_dbg(chan->device->dev, "%s: slave data %p\n", __func__, arg); - chan->private = arg; - return true; -} - -static void tmio_mmc_request_dma(struct tmio_mmc_host *host, - struct tmio_mmc_data *pdata) -{ - /* We can only either use DMA for both Tx and Rx or not use it at all */ - if (pdata->dma) { - dma_cap_mask_t mask; - - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - - host->chan_tx = dma_request_channel(mask, tmio_mmc_filter, - pdata->dma->chan_priv_tx); - dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__, - host->chan_tx); - - if (!host->chan_tx) - return; - - host->chan_rx = dma_request_channel(mask, tmio_mmc_filter, - pdata->dma->chan_priv_rx); - dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__, - host->chan_rx); - - if (!host->chan_rx) { - dma_release_channel(host->chan_tx); - host->chan_tx = NULL; - return; - } - - tasklet_init(&host->dma_complete, tmio_tasklet_fn, (unsigned long)host); - tasklet_init(&host->dma_issue, tmio_issue_tasklet_fn, (unsigned long)host); - - tmio_mmc_enable_dma(host, true); - } -} - -static void tmio_mmc_release_dma(struct tmio_mmc_host *host) -{ - if (host->chan_tx) { - struct dma_chan *chan = host->chan_tx; - host->chan_tx = NULL; - dma_release_channel(chan); - } - if (host->chan_rx) { - struct dma_chan *chan = host->chan_rx; - host->chan_rx = NULL; - dma_release_channel(chan); - } -} -#else -static void tmio_check_bounce_buffer(struct tmio_mmc_host *host) -{ -} - -static void tmio_mmc_start_dma(struct tmio_mmc_host *host, - struct mmc_data *data) -{ -} - -static void tmio_mmc_request_dma(struct tmio_mmc_host *host, - struct tmio_mmc_data *pdata) -{ - host->chan_tx = NULL; - host->chan_rx = NULL; -} - -static void tmio_mmc_release_dma(struct tmio_mmc_host *host) -{ -} -#endif - -static int tmio_mmc_start_data(struct tmio_mmc_host *host, - struct mmc_data *data) -{ - struct tmio_mmc_data *pdata = mfd_get_data(host->pdev); - - pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n", - data->blksz, data->blocks); - - /* Some hardware cannot perform 2 byte requests in 4 bit mode */ - if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) { - int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES; - - if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) { - pr_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); - - tmio_mmc_start_dma(host, data); - - 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); - int ret; - - if (host->mrq) - pr_debug("request not null\n"); - - host->last_req_ts = jiffies; - wmb(); - 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) { - schedule_delayed_work(&host->delayed_reset_work, - msecs_to_jiffies(2000)); - return; - } - -fail: - host->mrq = NULL; - 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 */ - if (host->set_pwr) - host->set_pwr(host->pdev, 0); - tmio_mmc_clk_stop(host); - break; - case MMC_POWER_ON: /* power up SD bus */ - if (host->set_pwr) - host->set_pwr(host->pdev, 1); - 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); - struct tmio_mmc_data *pdata = mfd_get_data(host->pdev); - - return ((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) || - (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT)) ? 0 : 1; -} - -static int tmio_mmc_get_cd(struct mmc_host *mmc) -{ - struct tmio_mmc_host *host = mmc_priv(mmc); - struct tmio_mmc_data *pdata = mfd_get_data(host->pdev); - - if (!pdata->get_cd) - return -ENOSYS; - else - return pdata->get_cd(host->pdev); -} - -static const struct mmc_host_ops tmio_mmc_ops = { - .request = tmio_mmc_request, - .set_ios = tmio_mmc_set_ios, - .get_ro = tmio_mmc_get_ro, - .get_cd = tmio_mmc_get_cd, - .enable_sdio_irq = tmio_mmc_enable_sdio_irq, -}; +#include "tmio_mmc.h" #ifdef CONFIG_PM static int tmio_mmc_suspend(struct platform_device *dev, pm_message_t state) @@ -1227,138 +62,54 @@ out: #define tmio_mmc_resume NULL #endif -static int __devinit tmio_mmc_probe(struct platform_device *dev) +static int __devinit tmio_mmc_probe(struct platform_device *pdev) { - const struct mfd_cell *cell = mfd_get_cell(dev); + const struct mfd_cell *cell = mfd_get_cell(pdev); struct tmio_mmc_data *pdata; - struct resource *res_ctl; struct tmio_mmc_host *host; - struct mmc_host *mmc; int ret = -EINVAL; - u32 irq_mask = TMIO_MASK_CMD; - if (dev->num_resources != 2) + if (pdev->num_resources != 2) goto out; - res_ctl = platform_get_resource(dev, IORESOURCE_MEM, 0); - if (!res_ctl) - goto out; - - pdata = mfd_get_data(dev); + pdata = mfd_get_data(pdev); if (!pdata || !pdata->hclk) goto out; - ret = -ENOMEM; - - mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &dev->dev); - if (!mmc) - goto out; - - host = mmc_priv(mmc); - host->mmc = mmc; - host->pdev = dev; - platform_set_drvdata(dev, mmc); - - host->set_pwr = pdata->set_pwr; - host->set_clk_div = pdata->set_clk_div; - - /* 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; - - mmc->ops = &tmio_mmc_ops; - mmc->caps = MMC_CAP_4_BIT_DATA | pdata->capabilities; - mmc->f_max = pdata->hclk; - mmc->f_min = mmc->f_max / 512; - mmc->max_segs = 32; - mmc->max_blk_size = 512; - mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) * - mmc->max_segs; - mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; - mmc->max_seg_size = mmc->max_req_size; - if (pdata->ocr_mask) - mmc->ocr_avail = pdata->ocr_mask; - else - 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_ctl; + goto out; } - tmio_mmc_clk_stop(host); - reset(host); - - ret = platform_get_irq(dev, 0); - if (ret >= 0) - host->irq = ret; - else - goto cell_disable; - - disable_mmc_irqs(host, TMIO_MASK_ALL); - if (pdata->flags & TMIO_MMC_SDIO_IRQ) - tmio_mmc_enable_sdio_irq(mmc, 0); - - 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 cell_disable; - spin_lock_init(&host->lock); - - /* Init delayed work for request timeouts */ - INIT_DELAYED_WORK(&host->delayed_reset_work, tmio_mmc_reset_work); - - /* See if we also get DMA */ - tmio_mmc_request_dma(host, pdata); - - mmc_add_host(mmc); - pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc), (unsigned long)host->ctl, host->irq); - /* Unmask the IRQs we want to know about */ - if (!host->chan_rx) - irq_mask |= TMIO_MASK_READOP; - if (!host->chan_tx) - irq_mask |= TMIO_MASK_WRITEOP; - enable_mmc_irqs(host, irq_mask); - return 0; cell_disable: if (cell->disable) - cell->disable(dev); -unmap_ctl: - iounmap(host->ctl); -host_free: - mmc_free_host(mmc); + cell->disable(pdev); out: return ret; } -static int __devexit tmio_mmc_remove(struct platform_device *dev) +static int __devexit tmio_mmc_remove(struct platform_device *pdev) { - const struct mfd_cell *cell = mfd_get_cell(dev); - struct mmc_host *mmc = platform_get_drvdata(dev); + const struct mfd_cell *cell = mfd_get_cell(pdev); + struct mmc_host *mmc = platform_get_drvdata(pdev); - platform_set_drvdata(dev, NULL); + platform_set_drvdata(pdev, NULL); if (mmc) { - struct tmio_mmc_host *host = mmc_priv(mmc); - mmc_remove_host(mmc); - cancel_delayed_work_sync(&host->delayed_reset_work); - tmio_mmc_release_dma(host); - free_irq(host->irq, host); + tmio_mmc_host_remove(mmc_priv(mmc)); if (cell->disable) - cell->disable(dev); - iounmap(host->ctl); - mmc_free_host(mmc); + cell->disable(pdev); } return 0; |