| /* |
| * 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/dmaengine.h> |
| #include <linux/dma-mapping.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/of.h> |
| #include <linux/of_device.h> |
| #include <linux/of_gpio.h> |
| #include <linux/platform_device.h> |
| #include <linux/scatterlist.h> |
| #include <linux/seq_file.h> |
| #include <linux/slab.h> |
| #include <linux/stat.h> |
| #include <linux/types.h> |
| |
| #include <linux/mmc/host.h> |
| #include <linux/mmc/sdio.h> |
| |
| #include <mach/atmel-mci.h> |
| #include <linux/atmel-mci.h> |
| #include <linux/atmel_pdc.h> |
| |
| #include <asm/io.h> |
| #include <asm/unaligned.h> |
| |
| #include <mach/cpu.h> |
| #include <mach/board.h> |
| |
| #include "atmel-mci-regs.h" |
| |
| #define ATMCI_DATA_ERROR_FLAGS (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE) |
| #define ATMCI_DMA_THRESHOLD 16 |
| |
| enum { |
| EVENT_CMD_RDY = 0, |
| EVENT_XFER_COMPLETE, |
| EVENT_NOTBUSY, |
| EVENT_DATA_ERROR, |
| }; |
| |
| enum atmel_mci_state { |
| STATE_IDLE = 0, |
| STATE_SENDING_CMD, |
| STATE_DATA_XFER, |
| STATE_WAITING_NOTBUSY, |
| STATE_SENDING_STOP, |
| STATE_END_REQUEST, |
| }; |
| |
| enum atmci_xfer_dir { |
| XFER_RECEIVE = 0, |
| XFER_TRANSMIT, |
| }; |
| |
| enum atmci_pdc_buf { |
| PDC_FIRST_BUF = 0, |
| PDC_SECOND_BUF, |
| }; |
| |
| struct atmel_mci_caps { |
| bool has_dma_conf_reg; |
| bool has_pdc; |
| bool has_cfg_reg; |
| bool has_cstor_reg; |
| bool has_highspeed; |
| bool has_rwproof; |
| bool has_odd_clk_div; |
| bool has_bad_data_ordering; |
| bool need_reset_after_xfer; |
| bool need_blksz_mul_4; |
| bool need_notbusy_for_read_ops; |
| }; |
| |
| struct atmel_mci_dma { |
| struct dma_chan *chan; |
| struct dma_async_tx_descriptor *data_desc; |
| }; |
| |
| /** |
| * struct atmel_mci - MMC controller state shared between all slots |
| * @lock: Spinlock protecting the queue and associated data. |
| * @regs: Pointer to MMIO registers. |
| * @sg: Scatterlist entry currently being processed by PIO or PDC code. |
| * @pio_offset: Offset into the current scatterlist entry. |
| * @buffer: Buffer used if we don't have the r/w proof capability. We |
| * don't have the time to switch pdc buffers so we have to use only |
| * one buffer for the full transaction. |
| * @buf_size: size of the buffer. |
| * @phys_buf_addr: buffer address needed for pdc. |
| * @cur_slot: The slot which is currently using the controller. |
| * @mrq: The request currently being processed on @cur_slot, |
| * or NULL if the controller is idle. |
| * @cmd: The command currently being sent to the card, or NULL. |
| * @data: The data currently being transferred, or NULL if no data |
| * transfer is in progress. |
| * @data_size: just data->blocks * data->blksz. |
| * @dma: DMA client state. |
| * @data_chan: DMA channel being used for the current data transfer. |
| * @cmd_status: Snapshot of SR taken upon completion of the current |
| * command. Only valid when EVENT_CMD_COMPLETE is pending. |
| * @data_status: Snapshot of SR taken upon completion of the current |
| * data transfer. Only valid when EVENT_DATA_COMPLETE or |
| * EVENT_DATA_ERROR is pending. |
| * @stop_cmdr: Value to be loaded into CMDR when the stop command is |
| * to be sent. |
| * @tasklet: Tasklet running the request state machine. |
| * @pending_events: Bitmask of events flagged by the interrupt handler |
| * to be processed by the tasklet. |
| * @completed_events: Bitmask of events which the state machine has |
| * processed. |
| * @state: Tasklet state. |
| * @queue: List of slots waiting for access to the controller. |
| * @need_clock_update: Update the clock rate before the next request. |
| * @need_reset: Reset controller before next request. |
| * @timer: Timer to balance the data timeout error flag which cannot rise. |
| * @mode_reg: Value of the MR register. |
| * @cfg_reg: Value of the CFG register. |
| * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus |
| * rate and timeout calculations. |
| * @mapbase: Physical address of the MMIO registers. |
| * @mck: The peripheral bus clock hooked up to the MMC controller. |
| * @pdev: Platform device associated with the MMC controller. |
| * @slot: Slots sharing this MMC controller. |
| * @caps: MCI capabilities depending on MCI version. |
| * @prepare_data: function to setup MCI before data transfer which |
| * depends on MCI capabilities. |
| * @submit_data: function to start data transfer which depends on MCI |
| * capabilities. |
| * @stop_transfer: function to stop data transfer which depends on MCI |
| * capabilities. |
| * |
| * Locking |
| * ======= |
| * |
| * @lock is a softirq-safe spinlock protecting @queue as well as |
| * @cur_slot, @mrq and @state. These must always be updated |
| * at the same time while holding @lock. |
| * |
| * @lock also protects mode_reg and need_clock_update since these are |
| * used to synchronize mode register updates with the queue |
| * processing. |
| * |
| * The @mrq field of struct atmel_mci_slot is also protected by @lock, |
| * and must always be written at the same time as the slot is added to |
| * @queue. |
| * |
| * @pending_events and @completed_events are accessed using atomic bit |
| * operations, so they don't need any locking. |
| * |
| * None of the fields touched by the interrupt handler need any |
| * locking. However, ordering is important: Before EVENT_DATA_ERROR or |
| * EVENT_DATA_COMPLETE is set in @pending_events, all data-related |
| * interrupts must be disabled and @data_status updated with a |
| * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the |
| * CMDRDY interrupt must be disabled and @cmd_status updated with a |
| * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the |
| * bytes_xfered field of @data must be written. This is ensured by |
| * using barriers. |
| */ |
| struct atmel_mci { |
| spinlock_t lock; |
| void __iomem *regs; |
| |
| struct scatterlist *sg; |
| unsigned int pio_offset; |
| unsigned int *buffer; |
| unsigned int buf_size; |
| dma_addr_t buf_phys_addr; |
| |
| struct atmel_mci_slot *cur_slot; |
| struct mmc_request *mrq; |
| struct mmc_command *cmd; |
| struct mmc_data *data; |
| unsigned int data_size; |
| |
| struct atmel_mci_dma dma; |
| struct dma_chan *data_chan; |
| struct dma_slave_config dma_conf; |
| |
| u32 cmd_status; |
| u32 data_status; |
| u32 stop_cmdr; |
| |
| struct tasklet_struct tasklet; |
| unsigned long pending_events; |
| unsigned long completed_events; |
| enum atmel_mci_state state; |
| struct list_head queue; |
| |
| bool need_clock_update; |
| bool need_reset; |
| struct timer_list timer; |
| u32 mode_reg; |
| u32 cfg_reg; |
| unsigned long bus_hz; |
| unsigned long mapbase; |
| struct clk *mck; |
| struct platform_device *pdev; |
| |
| struct atmel_mci_slot *slot[ATMCI_MAX_NR_SLOTS]; |
| |
| struct atmel_mci_caps caps; |
| |
| u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data); |
| void (*submit_data)(struct atmel_mci *host, struct mmc_data *data); |
| void (*stop_transfer)(struct atmel_mci *host); |
| }; |
| |
| /** |
| * struct atmel_mci_slot - MMC slot state |
| * @mmc: The mmc_host representing this slot. |
| * @host: The MMC controller this slot is using. |
| * @sdc_reg: Value of SDCR to be written before using this slot. |
| * @sdio_irq: SDIO irq mask for this slot. |
| * @mrq: mmc_request currently being processed or waiting to be |
| * processed, or NULL when the slot is idle. |
| * @queue_node: List node for placing this node in the @queue list of |
| * &struct atmel_mci. |
| * @clock: Clock rate configured by set_ios(). Protected by host->lock. |
| * @flags: Random state bits associated with the slot. |
| * @detect_pin: GPIO pin used for card detection, or negative if not |
| * available. |
| * @wp_pin: GPIO pin used for card write protect sending, or negative |
| * if not available. |
| * @detect_is_active_high: The state of the detect pin when it is active. |
| * @detect_timer: Timer used for debouncing @detect_pin interrupts. |
| */ |
| struct atmel_mci_slot { |
| struct mmc_host *mmc; |
| struct atmel_mci *host; |
| |
| u32 sdc_reg; |
| u32 sdio_irq; |
| |
| struct mmc_request *mrq; |
| struct list_head queue_node; |
| |
| unsigned int clock; |
| unsigned long flags; |
| #define ATMCI_CARD_PRESENT 0 |
| #define ATMCI_CARD_NEED_INIT 1 |
| #define ATMCI_SHUTDOWN 2 |
| #define ATMCI_SUSPENDED 3 |
| |
| int detect_pin; |
| int wp_pin; |
| bool detect_is_active_high; |
| |
| struct timer_list detect_timer; |
| }; |
| |
| #define atmci_test_and_clear_pending(host, event) \ |
| test_and_clear_bit(event, &host->pending_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) |
| |
| /* |
| * 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_slot *slot = s->private; |
| struct mmc_request *mrq; |
| struct mmc_command *cmd; |
| struct mmc_command *stop; |
| struct mmc_data *data; |
| |
| /* Make sure we get a consistent snapshot */ |
| spin_lock_bh(&slot->host->lock); |
| mrq = slot->mrq; |
| |
| 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[3], 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[3], stop->error); |
| } |
| |
| spin_unlock_bh(&slot->host->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", |
| [6] = "ENDRX", |
| [7] = "ENDTX", |
| [8] = "SDIOIRQA", |
| [9] = "SDIOIRQB", |
| [12] = "SDIOWAIT", |
| [14] = "RXBUFF", |
| [15] = "TXBUFE", |
| [16] = "RINDE", |
| [17] = "RDIRE", |
| [18] = "RCRCE", |
| [19] = "RENDE", |
| [20] = "RTOE", |
| [21] = "DCRCE", |
| [22] = "DTOE", |
| [23] = "CSTOE", |
| [24] = "BLKOVRE", |
| [25] = "DMADONE", |
| [26] = "FIFOEMPTY", |
| [27] = "XFRDONE", |
| [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(ATMCI_REGS_SIZE, GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| |
| /* |
| * Grab a more or less consistent snapshot. Note that we're |
| * not disabling interrupts, so IMR and SR may not be |
| * consistent. |
| */ |
| spin_lock_bh(&host->lock); |
| clk_enable(host->mck); |
| memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE); |
| clk_disable(host->mck); |
| spin_unlock_bh(&host->lock); |
| |
| seq_printf(s, "MR:\t0x%08x%s%s ", |
| buf[ATMCI_MR / 4], |
| buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "", |
| buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : ""); |
| if (host->caps.has_odd_clk_div) |
| seq_printf(s, "{CLKDIV,CLKODD}=%u\n", |
| ((buf[ATMCI_MR / 4] & 0xff) << 1) |
| | ((buf[ATMCI_MR / 4] >> 16) & 1)); |
| else |
| seq_printf(s, "CLKDIV=%u\n", |
| (buf[ATMCI_MR / 4] & 0xff)); |
| seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]); |
| seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]); |
| seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]); |
| seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n", |
| buf[ATMCI_BLKR / 4], |
| buf[ATMCI_BLKR / 4] & 0xffff, |
| (buf[ATMCI_BLKR / 4] >> 16) & 0xffff); |
| if (host->caps.has_cstor_reg) |
| seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]); |
| |
| /* Don't read RSPR and RDR; it will consume the data there */ |
| |
| atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]); |
| atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]); |
| |
| if (host->caps.has_dma_conf_reg) { |
| u32 val; |
| |
| val = buf[ATMCI_DMA / 4]; |
| seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n", |
| val, val & 3, |
| ((val >> 4) & 3) ? |
| 1 << (((val >> 4) & 3) + 1) : 1, |
| val & ATMCI_DMAEN ? " DMAEN" : ""); |
| } |
| if (host->caps.has_cfg_reg) { |
| u32 val; |
| |
| val = buf[ATMCI_CFG / 4]; |
| seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n", |
| val, |
| val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "", |
| val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "", |
| val & ATMCI_CFG_HSMODE ? " HSMODE" : "", |
| val & ATMCI_CFG_LSYNC ? " LSYNC" : ""); |
| } |
| |
| kfree(buf); |
| |
| 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_slot *slot) |
| { |
| struct mmc_host *mmc = slot->mmc; |
| struct atmel_mci *host = slot->host; |
| struct dentry *root; |
| struct dentry *node; |
| |
| 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; |
| |
| node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops); |
| if (!node) |
| goto err; |
| |
| node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state); |
| 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(&mmc->class_dev, "failed to initialize debugfs for slot\n"); |
| } |
| |
| #if defined(CONFIG_OF) |
| static const struct of_device_id atmci_dt_ids[] = { |
| { .compatible = "atmel,hsmci" }, |
| { /* sentinel */ } |
| }; |
| |
| MODULE_DEVICE_TABLE(of, atmci_dt_ids); |
| |
| static struct mci_platform_data __devinit* |
| atmci_of_init(struct platform_device *pdev) |
| { |
| struct device_node *np = pdev->dev.of_node; |
| struct device_node *cnp; |
| struct mci_platform_data *pdata; |
| u32 slot_id; |
| |
| if (!np) { |
| dev_err(&pdev->dev, "device node not found\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
| if (!pdata) { |
| dev_err(&pdev->dev, "could not allocate memory for pdata\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| for_each_child_of_node(np, cnp) { |
| if (of_property_read_u32(cnp, "reg", &slot_id)) { |
| dev_warn(&pdev->dev, "reg property is missing for %s\n", |
| cnp->full_name); |
| continue; |
| } |
| |
| if (slot_id >= ATMCI_MAX_NR_SLOTS) { |
| dev_warn(&pdev->dev, "can't have more than %d slots\n", |
| ATMCI_MAX_NR_SLOTS); |
| break; |
| } |
| |
| if (of_property_read_u32(cnp, "bus-width", |
| &pdata->slot[slot_id].bus_width)) |
| pdata->slot[slot_id].bus_width = 1; |
| |
| pdata->slot[slot_id].detect_pin = |
| of_get_named_gpio(cnp, "cd-gpios", 0); |
| |
| pdata->slot[slot_id].detect_is_active_high = |
| of_property_read_bool(cnp, "cd-inverted"); |
| |
| pdata->slot[slot_id].wp_pin = |
| of_get_named_gpio(cnp, "wp-gpios", 0); |
| } |
| |
| return pdata; |
| } |
| #else /* CONFIG_OF */ |
| static inline struct mci_platform_data* |
| atmci_of_init(struct platform_device *dev) |
| { |
| return ERR_PTR(-EINVAL); |
| } |
| #endif |
| |
| static inline unsigned int atmci_get_version(struct atmel_mci *host) |
| { |
| return atmci_readl(host, ATMCI_VERSION) & 0x00000fff; |
| } |
| |
| static void atmci_timeout_timer(unsigned long data) |
| { |
| struct atmel_mci *host; |
| |
| host = (struct atmel_mci *)data; |
| |
| dev_dbg(&host->pdev->dev, "software timeout\n"); |
| |
| if (host->mrq->cmd->data) { |
| host->mrq->cmd->data->error = -ETIMEDOUT; |
| host->data = NULL; |
| } else { |
| host->mrq->cmd->error = -ETIMEDOUT; |
| host->cmd = NULL; |
| } |
| host->need_reset = 1; |
| host->state = STATE_END_REQUEST; |
| smp_wmb(); |
| tasklet_schedule(&host->tasklet); |
| } |
| |
| static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host, |
| unsigned int ns) |
| { |
| /* |
| * It is easier here to use us instead of ns for the timeout, |
| * it prevents from overflows during calculation. |
| */ |
| unsigned int us = DIV_ROUND_UP(ns, 1000); |
| |
| /* Maximum clock frequency is host->bus_hz/2 */ |
| return us * (DIV_ROUND_UP(host->bus_hz, 2000000)); |
| } |
| |
| static void atmci_set_timeout(struct atmel_mci *host, |
| struct atmel_mci_slot *slot, struct mmc_data *data) |
| { |
| static unsigned dtomul_to_shift[] = { |
| 0, 4, 7, 8, 10, 12, 16, 20 |
| }; |
| unsigned timeout; |
| unsigned dtocyc; |
| unsigned dtomul; |
| |
| timeout = atmci_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(&slot->mmc->class_dev, "setting timeout to %u cycles\n", |
| dtocyc << dtomul_to_shift[dtomul]); |
| atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_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 = ATMCI_CMDR_CMDNB(cmd->opcode); |
| |
| if (cmd->flags & MMC_RSP_PRESENT) { |
| if (cmd->flags & MMC_RSP_136) |
| cmdr |= ATMCI_CMDR_RSPTYP_136BIT; |
| else |
| cmdr |= ATMCI_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 |= ATMCI_CMDR_MAXLAT_64CYC; |
| |
| if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN) |
| cmdr |= ATMCI_CMDR_OPDCMD; |
| |
| data = cmd->data; |
| if (data) { |
| cmdr |= ATMCI_CMDR_START_XFER; |
| |
| if (cmd->opcode == SD_IO_RW_EXTENDED) { |
| cmdr |= ATMCI_CMDR_SDIO_BLOCK; |
| } else { |
| if (data->flags & MMC_DATA_STREAM) |
| cmdr |= ATMCI_CMDR_STREAM; |
| else if (data->blocks > 1) |
| cmdr |= ATMCI_CMDR_MULTI_BLOCK; |
| else |
| cmdr |= ATMCI_CMDR_BLOCK; |
| } |
| |
| if (data->flags & MMC_DATA_READ) |
| cmdr |= ATMCI_CMDR_TRDIR_READ; |
| } |
| |
| return cmdr; |
| } |
| |
| static void atmci_send_command(struct atmel_mci *host, |
| struct mmc_command *cmd, u32 cmd_flags) |
| { |
| WARN_ON(host->cmd); |
| host->cmd = cmd; |
| |
| dev_vdbg(&host->pdev->dev, |
| "start command: ARGR=0x%08x CMDR=0x%08x\n", |
| cmd->arg, cmd_flags); |
| |
| atmci_writel(host, ATMCI_ARGR, cmd->arg); |
| atmci_writel(host, ATMCI_CMDR, cmd_flags); |
| } |
| |
| static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data) |
| { |
| dev_dbg(&host->pdev->dev, "send stop command\n"); |
| atmci_send_command(host, data->stop, host->stop_cmdr); |
| atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY); |
| } |
| |
| /* |
| * Configure given PDC buffer taking care of alignement issues. |
| * Update host->data_size and host->sg. |
| */ |
| static void atmci_pdc_set_single_buf(struct atmel_mci *host, |
| enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb) |
| { |
| u32 pointer_reg, counter_reg; |
| unsigned int buf_size; |
| |
| if (dir == XFER_RECEIVE) { |
| pointer_reg = ATMEL_PDC_RPR; |
| counter_reg = ATMEL_PDC_RCR; |
| } else { |
| pointer_reg = ATMEL_PDC_TPR; |
| counter_reg = ATMEL_PDC_TCR; |
| } |
| |
| if (buf_nb == PDC_SECOND_BUF) { |
| pointer_reg += ATMEL_PDC_SCND_BUF_OFF; |
| counter_reg += ATMEL_PDC_SCND_BUF_OFF; |
| } |
| |
| if (!host->caps.has_rwproof) { |
| buf_size = host->buf_size; |
| atmci_writel(host, pointer_reg, host->buf_phys_addr); |
| } else { |
| buf_size = sg_dma_len(host->sg); |
| atmci_writel(host, pointer_reg, sg_dma_address(host->sg)); |
| } |
| |
| if (host->data_size <= buf_size) { |
| if (host->data_size & 0x3) { |
| /* If size is different from modulo 4, transfer bytes */ |
| atmci_writel(host, counter_reg, host->data_size); |
| atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE); |
| } else { |
| /* Else transfer 32-bits words */ |
| atmci_writel(host, counter_reg, host->data_size / 4); |
| } |
| host->data_size = 0; |
| } else { |
| /* We assume the size of a page is 32-bits aligned */ |
| atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4); |
| host->data_size -= sg_dma_len(host->sg); |
| if (host->data_size) |
| host->sg = sg_next(host->sg); |
| } |
| } |
| |
| /* |
| * Configure PDC buffer according to the data size ie configuring one or two |
| * buffers. Don't use this function if you want to configure only the second |
| * buffer. In this case, use atmci_pdc_set_single_buf. |
| */ |
| static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir) |
| { |
| atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF); |
| if (host->data_size) |
| atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF); |
| } |
| |
| /* |
| * Unmap sg lists, called when transfer is finished. |
| */ |
| static void atmci_pdc_cleanup(struct atmel_mci *host) |
| { |
| struct mmc_data *data = host->data; |
| |
| if (data) |
| dma_unmap_sg(&host->pdev->dev, |
| data->sg, data->sg_len, |
| ((data->flags & MMC_DATA_WRITE) |
| ? DMA_TO_DEVICE : DMA_FROM_DEVICE)); |
| } |
| |
| /* |
| * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after |
| * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY |
| * interrupt needed for both transfer directions. |
| */ |
| static void atmci_pdc_complete(struct atmel_mci *host) |
| { |
| int transfer_size = host->data->blocks * host->data->blksz; |
| int i; |
| |
| atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS); |
| |
| if ((!host->caps.has_rwproof) |
| && (host->data->flags & MMC_DATA_READ)) { |
| if (host->caps.has_bad_data_ordering) |
| for (i = 0; i < transfer_size; i++) |
| host->buffer[i] = swab32(host->buffer[i]); |
| sg_copy_from_buffer(host->data->sg, host->data->sg_len, |
| host->buffer, transfer_size); |
| } |
| |
| atmci_pdc_cleanup(host); |
| |
| /* |
| * If the card was removed, data will be NULL. No point trying |
| * to send the stop command or waiting for NBUSY in this case. |
| */ |
| if (host->data) { |
| dev_dbg(&host->pdev->dev, |
| "(%s) set pending xfer complete\n", __func__); |
| atmci_set_pending(host, EVENT_XFER_COMPLETE); |
| tasklet_schedule(&host->tasklet); |
| } |
| } |
| |
| static void atmci_dma_cleanup(struct atmel_mci *host) |
| { |
| struct mmc_data *data = host->data; |
| |
| if (data) |
| dma_unmap_sg(host->dma.chan->device->dev, |
| data->sg, data->sg_len, |
| ((data->flags & MMC_DATA_WRITE) |
| ? DMA_TO_DEVICE : DMA_FROM_DEVICE)); |
| } |
| |
| /* |
| * This function is called by the DMA driver from tasklet context. |
| */ |
| static void atmci_dma_complete(void *arg) |
| { |
| struct atmel_mci *host = arg; |
| struct mmc_data *data = host->data; |
| |
| dev_vdbg(&host->pdev->dev, "DMA complete\n"); |
| |
| if (host->caps.has_dma_conf_reg) |
| /* Disable DMA hardware handshaking on MCI */ |
| atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN); |
| |
| atmci_dma_cleanup(host); |
| |
| /* |
| * If the card was removed, data will be NULL. No point trying |
| * to send the stop command or waiting for NBUSY in this case. |
| */ |
| if (data) { |
| dev_dbg(&host->pdev->dev, |
| "(%s) set pending xfer complete\n", __func__); |
| atmci_set_pending(host, EVENT_XFER_COMPLETE); |
| tasklet_schedule(&host->tasklet); |
| |
| /* |
| * Regardless of what the documentation says, we have |
| * to wait for NOTBUSY even after block read |
| * operations. |
| * |
| * When the DMA transfer is complete, the controller |
| * may still be reading the CRC from the card, i.e. |
| * the data transfer is still in progress and we |
| * haven't seen all the potential error bits yet. |
| * |
| * The interrupt handler will schedule a different |
| * tasklet to finish things up when the data transfer |
| * is completely done. |
| * |
| * We may not complete the mmc request here anyway |
| * because the mmc layer may call back and cause us to |
| * violate the "don't submit new operations from the |
| * completion callback" rule of the dma engine |
| * framework. |
| */ |
| atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY); |
| } |
| } |
| |
| /* |
| * Returns a mask of interrupt flags to be enabled after the whole |
| * request has been prepared. |
| */ |
| static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data) |
| { |
| u32 iflags; |
| |
| data->error = -EINPROGRESS; |
| |
| host->sg = data->sg; |
| host->data = data; |
| host->data_chan = NULL; |
| |
| iflags = ATMCI_DATA_ERROR_FLAGS; |
| |
| /* |
| * Errata: MMC data write operation with less than 12 |
| * bytes is impossible. |
| * |
| * Errata: MCI Transmit Data Register (TDR) FIFO |
| * corruption when length is not multiple of 4. |
| */ |
| if (data->blocks * data->blksz < 12 |
| || (data->blocks * data->blksz) & 3) |
| host->need_reset = true; |
| |
| host->pio_offset = 0; |
| if (data->flags & MMC_DATA_READ) |
| iflags |= ATMCI_RXRDY; |
| else |
| iflags |= ATMCI_TXRDY; |
| |
| return iflags; |
| } |
| |
| /* |
| * Set interrupt flags and set block length into the MCI mode register even |
| * if this value is also accessible in the MCI block register. It seems to be |
| * necessary before the High Speed MCI version. It also map sg and configure |
| * PDC registers. |
| */ |
| static u32 |
| atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data) |
| { |
| u32 iflags, tmp; |
| unsigned int sg_len; |
| enum dma_data_direction dir; |
| int i; |
| |
| data->error = -EINPROGRESS; |
| |
| host->data = data; |
| host->sg = data->sg; |
| iflags = ATMCI_DATA_ERROR_FLAGS; |
| |
| /* Enable pdc mode */ |
| atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE); |
| |
| if (data->flags & MMC_DATA_READ) { |
| dir = DMA_FROM_DEVICE; |
| iflags |= ATMCI_ENDRX | ATMCI_RXBUFF; |
| } else { |
| dir = DMA_TO_DEVICE; |
| iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE; |
| } |
| |
| /* Set BLKLEN */ |
| tmp = atmci_readl(host, ATMCI_MR); |
| tmp &= 0x0000ffff; |
| tmp |= ATMCI_BLKLEN(data->blksz); |
| atmci_writel(host, ATMCI_MR, tmp); |
| |
| /* Configure PDC */ |
| host->data_size = data->blocks * data->blksz; |
| sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir); |
| |
| if ((!host->caps.has_rwproof) |
| && (host->data->flags & MMC_DATA_WRITE)) { |
| sg_copy_to_buffer(host->data->sg, host->data->sg_len, |
| host->buffer, host->data_size); |
| if (host->caps.has_bad_data_ordering) |
| for (i = 0; i < host->data_size; i++) |
| host->buffer[i] = swab32(host->buffer[i]); |
| } |
| |
| if (host->data_size) |
| atmci_pdc_set_both_buf(host, |
| ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT)); |
| |
| return iflags; |
| } |
| |
| static u32 |
| atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data) |
| { |
| struct dma_chan *chan; |
| struct dma_async_tx_descriptor *desc; |
| struct scatterlist *sg; |
| unsigned int i; |
| enum dma_data_direction direction; |
| enum dma_transfer_direction slave_dirn; |
| unsigned int sglen; |
| u32 maxburst; |
| u32 iflags; |
| |
| data->error = -EINPROGRESS; |
| |
| WARN_ON(host->data); |
| host->sg = NULL; |
| host->data = data; |
| |
| iflags = ATMCI_DATA_ERROR_FLAGS; |
| |
| /* |
| * We don't do DMA on "complex" transfers, i.e. with |
| * non-word-aligned buffers or lengths. Also, we don't bother |
| * with all the DMA setup overhead for short transfers. |
| */ |
| if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD) |
| return atmci_prepare_data(host, data); |
| if (data->blksz & 3) |
| return atmci_prepare_data(host, data); |
| |
| for_each_sg(data->sg, sg, data->sg_len, i) { |
| if (sg->offset & 3 || sg->length & 3) |
| return atmci_prepare_data(host, data); |
| } |
| |
| /* If we don't have a channel, we can't do DMA */ |
| chan = host->dma.chan; |
| if (chan) |
| host->data_chan = chan; |
| |
| if (!chan) |
| return -ENODEV; |
| |
| if (data->flags & MMC_DATA_READ) { |
| direction = DMA_FROM_DEVICE; |
| host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM; |
| maxburst = atmci_convert_chksize(host->dma_conf.src_maxburst); |
| } else { |
| direction = DMA_TO_DEVICE; |
| host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV; |
| maxburst = atmci_convert_chksize(host->dma_conf.dst_maxburst); |
| } |
| |
| if (host->caps.has_dma_conf_reg) |
| atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) | |
| ATMCI_DMAEN); |
| |
| sglen = dma_map_sg(chan->device->dev, data->sg, |
| data->sg_len, direction); |
| |
| dmaengine_slave_config(chan, &host->dma_conf); |
| desc = dmaengine_prep_slave_sg(chan, |
| data->sg, sglen, slave_dirn, |
| DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
| if (!desc) |
| goto unmap_exit; |
| |
| host->dma.data_desc = desc; |
| desc->callback = atmci_dma_complete; |
| desc->callback_param = host; |
| |
| return iflags; |
| unmap_exit: |
| dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction); |
| return -ENOMEM; |
| } |
| |
| static void |
| atmci_submit_data(struct atmel_mci *host, struct mmc_data *data) |
| { |
| return; |
| } |
| |
| /* |
| * Start PDC according to transfer direction. |
| */ |
| static void |
| atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data) |
| { |
| if (data->flags & MMC_DATA_READ) |
| atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN); |
| else |
| atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN); |
| } |
| |
| static void |
| atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data) |
| { |
| struct dma_chan *chan = host->data_chan; |
| struct dma_async_tx_descriptor *desc = host->dma.data_desc; |
| |
| if (chan) { |
| dmaengine_submit(desc); |
| dma_async_issue_pending(chan); |
| } |
| } |
| |
| static void atmci_stop_transfer(struct atmel_mci *host) |
| { |
| dev_dbg(&host->pdev->dev, |
| "(%s) set pending xfer complete\n", __func__); |
| atmci_set_pending(host, EVENT_XFER_COMPLETE); |
| atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY); |
| } |
| |
| /* |
| * Stop data transfer because error(s) occured. |
| */ |
| static void atmci_stop_transfer_pdc(struct atmel_mci *host) |
| { |
| atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS); |
| } |
| |
| static void atmci_stop_transfer_dma(struct atmel_mci *host) |
| { |
| struct dma_chan *chan = host->data_chan; |
| |
| if (chan) { |
| dmaengine_terminate_all(chan); |
| atmci_dma_cleanup(host); |
| } else { |
| /* Data transfer was stopped by the interrupt handler */ |
| dev_dbg(&host->pdev->dev, |
| "(%s) set pending xfer complete\n", __func__); |
| atmci_set_pending(host, EVENT_XFER_COMPLETE); |
| atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY); |
| } |
| } |
| |
| /* |
| * Start a request: prepare data if needed, prepare the command and activate |
| * interrupts. |
| */ |
| static void atmci_start_request(struct atmel_mci *host, |
| struct atmel_mci_slot *slot) |
| { |
| struct mmc_request *mrq; |
| struct mmc_command *cmd; |
| struct mmc_data *data; |
| u32 iflags; |
| u32 cmdflags; |
| |
| mrq = slot->mrq; |
| host->cur_slot = slot; |
| host->mrq = mrq; |
| |
| host->pending_events = 0; |
| host->completed_events = 0; |
| host->cmd_status = 0; |
| host->data_status = 0; |
| |
| dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode); |
| |
| if (host->need_reset || host->caps.need_reset_after_xfer) { |
| iflags = atmci_readl(host, ATMCI_IMR); |
| iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB); |
| atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST); |
| atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN); |
| atmci_writel(host, ATMCI_MR, host->mode_reg); |
| if (host->caps.has_cfg_reg) |
| atmci_writel(host, ATMCI_CFG, host->cfg_reg); |
| atmci_writel(host, ATMCI_IER, iflags); |
| host->need_reset = false; |
| } |
| atmci_writel(host, ATMCI_SDCR, slot->sdc_reg); |
| |
| iflags = atmci_readl(host, ATMCI_IMR); |
| if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB)) |
| dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n", |
| iflags); |
| |
| if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) { |
| /* Send init sequence (74 clock cycles) */ |
| atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT); |
| while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY)) |
| cpu_relax(); |
| } |
| iflags = 0; |
| data = mrq->data; |
| if (data) { |
| atmci_set_timeout(host, slot, data); |
| |
| /* Must set block count/size before sending command */ |
| atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks) |
| | ATMCI_BLKLEN(data->blksz)); |
| dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n", |
| ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz)); |
| |
| iflags |= host->prepare_data(host, data); |
| } |
| |
| iflags |= ATMCI_CMDRDY; |
| cmd = mrq->cmd; |
| cmdflags = atmci_prepare_command(slot->mmc, cmd); |
| atmci_send_command(host, cmd, cmdflags); |
| |
| if (data) |
| host->submit_data(host, data); |
| |
| if (mrq->stop) { |
| host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop); |
| host->stop_cmdr |= ATMCI_CMDR_STOP_XFER; |
| if (!(data->flags & MMC_DATA_WRITE)) |
| host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ; |
| if (data->flags & MMC_DATA_STREAM) |
| host->stop_cmdr |= ATMCI_CMDR_STREAM; |
| else |
| host->stop_cmdr |= ATMCI_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.) |
| */ |
| atmci_writel(host, ATMCI_IER, iflags); |
| |
| mod_timer(&host->timer, jiffies + msecs_to_jiffies(2000)); |
| } |
| |
| static void atmci_queue_request(struct atmel_mci *host, |
| struct atmel_mci_slot *slot, struct mmc_request *mrq) |
| { |
| dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n", |
| host->state); |
| |
| spin_lock_bh(&host->lock); |
| slot->mrq = mrq; |
| if (host->state == STATE_IDLE) { |
| host->state = STATE_SENDING_CMD; |
| atmci_start_request(host, slot); |
| } else { |
| dev_dbg(&host->pdev->dev, "queue request\n"); |
| list_add_tail(&slot->queue_node, &host->queue); |
| } |
| spin_unlock_bh(&host->lock); |
| } |
| |
| static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq) |
| { |
| struct atmel_mci_slot *slot = mmc_priv(mmc); |
| struct atmel_mci *host = slot->host; |
| struct mmc_data *data; |
| |
| WARN_ON(slot->mrq); |
| dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode); |
| |
| /* |
| * 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 (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) { |
| mrq->cmd->error = -ENOMEDIUM; |
| mmc_request_done(mmc, mrq); |
| return; |
| } |
| |
| /* We don't support multiple blocks of weird lengths. */ |
| data = mrq->data; |
| if (data && data->blocks > 1 && data->blksz & 3) { |
| mrq->cmd->error = -EINVAL; |
| mmc_request_done(mmc, mrq); |
| } |
| |
| atmci_queue_request(host, slot, mrq); |
| } |
| |
| static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) |
| { |
| struct atmel_mci_slot *slot = mmc_priv(mmc); |
| struct atmel_mci *host = slot->host; |
| unsigned int i; |
| |
| slot->sdc_reg &= ~ATMCI_SDCBUS_MASK; |
| switch (ios->bus_width) { |
| case MMC_BUS_WIDTH_1: |
| slot->sdc_reg |= ATMCI_SDCBUS_1BIT; |
| break; |
| case MMC_BUS_WIDTH_4: |
| slot->sdc_reg |= ATMCI_SDCBUS_4BIT; |
| break; |
| } |
| |
| if (ios->clock) { |
| unsigned int clock_min = ~0U; |
| u32 clkdiv; |
| |
| spin_lock_bh(&host->lock); |
| if (!host->mode_reg) { |
| clk_enable(host->mck); |
| atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST); |
| atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN); |
| if (host->caps.has_cfg_reg) |
| atmci_writel(host, ATMCI_CFG, host->cfg_reg); |
| } |
| |
| /* |
| * Use mirror of ios->clock to prevent race with mmc |
| * core ios update when finding the minimum. |
| */ |
| slot->clock = ios->clock; |
| for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) { |
| if (host->slot[i] && host->slot[i]->clock |
| && host->slot[i]->clock < clock_min) |
| clock_min = host->slot[i]->clock; |
| } |
| |
| /* Calculate clock divider */ |
| if (host->caps.has_odd_clk_div) { |
| clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2; |
| if (clkdiv > 511) { |
| dev_warn(&mmc->class_dev, |
| "clock %u too slow; using %lu\n", |
| clock_min, host->bus_hz / (511 + 2)); |
| clkdiv = 511; |
| } |
| host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1) |
| | ATMCI_MR_CLKODD(clkdiv & 1); |
| } else { |
| clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1; |
| if (clkdiv > 255) { |
| dev_warn(&mmc->class_dev, |
| "clock %u too slow; using %lu\n", |
| clock_min, host->bus_hz / (2 * 256)); |
| clkdiv = 255; |
| } |
| host->mode_reg = ATMCI_MR_CLKDIV(clkdiv); |
| } |
| |
| /* |
| * WRPROOF and RDPROOF prevent overruns/underruns by |
| * stopping the clock when the FIFO is full/empty. |
| * This state is not expected to last for long. |
| */ |
| if (host->caps.has_rwproof) |
| host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF); |
| |
| if (host->caps.has_cfg_reg) { |
| /* setup High Speed mode in relation with card capacity */ |
| if (ios->timing == MMC_TIMING_SD_HS) |
| host->cfg_reg |= ATMCI_CFG_HSMODE; |
| else |
| host->cfg_reg &= ~ATMCI_CFG_HSMODE; |
| } |
| |
| if (list_empty(&host->queue)) { |
| atmci_writel(host, ATMCI_MR, host->mode_reg); |
| if (host->caps.has_cfg_reg) |
| atmci_writel(host, ATMCI_CFG, host->cfg_reg); |
| } else { |
| host->need_clock_update = true; |
| } |
| |
| spin_unlock_bh(&host->lock); |
| } else { |
| bool any_slot_active = false; |
| |
| spin_lock_bh(&host->lock); |
| slot->clock = 0; |
| for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) { |
| if (host->slot[i] && host->slot[i]->clock) { |
| any_slot_active = true; |
| break; |
| } |
| } |
| if (!any_slot_active) { |
| atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS); |
| if (host->mode_reg) { |
| atmci_readl(host, ATMCI_MR); |
| clk_disable(host->mck); |
| } |
| host->mode_reg = 0; |
| } |
| spin_unlock_bh(&host->lock); |
| } |
| |
| switch (ios->power_mode) { |
| case MMC_POWER_UP: |
| set_bit(ATMCI_CARD_NEED_INIT, &slot->flags); |
| 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. |
| * |
| * We also need to hook this into the clock management |
| * somehow so that newly inserted cards aren't |
| * subjected to a fast clock before we have a chance |
| * to figure out what the maximum rate is. Currently, |
| * there's no way to avoid this, and there never will |
| * be for boards that don't support power control. |
| */ |
| break; |
| } |
| } |
| |
| static int atmci_get_ro(struct mmc_host *mmc) |
| { |
| int read_only = -ENOSYS; |
| struct atmel_mci_slot *slot = mmc_priv(mmc); |
| |
| if (gpio_is_valid(slot->wp_pin)) { |
| read_only = gpio_get_value(slot->wp_pin); |
| dev_dbg(&mmc->class_dev, "card is %s\n", |
| read_only ? "read-only" : "read-write"); |
| } |
| |
| return read_only; |
| } |
| |
| static int atmci_get_cd(struct mmc_host *mmc) |
| { |
| int present = -ENOSYS; |
| struct atmel_mci_slot *slot = mmc_priv(mmc); |
| |
| if (gpio_is_valid(slot->detect_pin)) { |
| present = !(gpio_get_value(slot->detect_pin) ^ |
| slot->detect_is_active_high); |
| dev_dbg(&mmc->class_dev, "card is %spresent\n", |
| present ? "" : "not "); |
| } |
| |
| return present; |
| } |
| |
| static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable) |
| { |
| struct atmel_mci_slot *slot = mmc_priv(mmc); |
| struct atmel_mci *host = slot->host; |
| |
| if (enable) |
| atmci_writel(host, ATMCI_IER, slot->sdio_irq); |
| else |
| atmci_writel(host, ATMCI_IDR, slot->sdio_irq); |
| } |
| |
| static const struct mmc_host_ops atmci_ops = { |
| .request = atmci_request, |
| .set_ios = atmci_set_ios, |
| .get_ro = atmci_get_ro, |
| .get_cd = atmci_get_cd, |
| .enable_sdio_irq = atmci_enable_sdio_irq, |
| }; |
| |
| /* Called with host->lock held */ |
| static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq) |
| __releases(&host->lock) |
| __acquires(&host->lock) |
| { |
| struct atmel_mci_slot *slot = NULL; |
| struct mmc_host *prev_mmc = host->cur_slot->mmc; |
| |
| WARN_ON(host->cmd || host->data); |
| |
| /* |
| * Update the MMC clock rate if necessary. This may be |
| * necessary if set_ios() is called when a different slot is |
| * busy transferring data. |
| */ |
| if (host->need_clock_update) { |
| atmci_writel(host, ATMCI_MR, host->mode_reg); |
| if (host->caps.has_cfg_reg) |
| atmci_writel(host, ATMCI_CFG, host->cfg_reg); |
| } |
| |
| host->cur_slot->mrq = NULL; |
| host->mrq = NULL; |
| if (!list_empty(&host->queue)) { |
| slot = list_entry(host->queue.next, |
| struct atmel_mci_slot, queue_node); |
| list_del(&slot->queue_node); |
| dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n", |
| mmc_hostname(slot->mmc)); |
| host->state = STATE_SENDING_CMD; |
| atmci_start_request(host, slot); |
| } else { |
| dev_vdbg(&host->pdev->dev, "list empty\n"); |
| host->state = STATE_IDLE; |
| } |
| |
| del_timer(&host->timer); |
| |
| spin_unlock(&host->lock); |
| mmc_request_done(prev_mmc, mrq); |
| spin_lock(&host->lock); |
| } |
| |
| static void atmci_command_complete(struct atmel_mci *host, |
| struct mmc_command *cmd) |
| { |
| u32 status = host->cmd_status; |
| |
| /* Read the response from the card (up to 16 bytes) */ |
| cmd->resp[0] = atmci_readl(host, ATMCI_RSPR); |
| cmd->resp[1] = atmci_readl(host, ATMCI_RSPR); |
| cmd->resp[2] = atmci_readl(host, ATMCI_RSPR); |
| cmd->resp[3] = atmci_readl(host, ATMCI_RSPR); |
| |
| if (status & ATMCI_RTOE) |
| cmd->error = -ETIMEDOUT; |
| else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE)) |
| cmd->error = -EILSEQ; |
| else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE)) |
| cmd->error = -EIO; |
| else if (host->mrq->data && (host->mrq->data->blksz & 3)) { |
| if (host->caps.need_blksz_mul_4) { |
| cmd->error = -EINVAL; |
| host->need_reset = 1; |
| } |
| } else |
| cmd->error = 0; |
| } |
| |
| static void atmci_detect_change(unsigned long data) |
| { |
| struct atmel_mci_slot *slot = (struct atmel_mci_slot *)data; |
| bool present; |
| bool present_old; |
| |
| /* |
| * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before |
| * freeing the interrupt. We must not re-enable the interrupt |
| * if it has been freed, and if we're shutting down, it |
| * doesn't really matter whether the card is present or not. |
| */ |
| smp_rmb(); |
| if (test_bit(ATMCI_SHUTDOWN, &slot->flags)) |
| return; |
| |
| enable_irq(gpio_to_irq(slot->detect_pin)); |
| present = !(gpio_get_value(slot->detect_pin) ^ |
| slot->detect_is_active_high); |
| present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags); |
| |
| dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n", |
| present, present_old); |
| |
| if (present != present_old) { |
| struct atmel_mci *host = slot->host; |
| struct mmc_request *mrq; |
| |
| dev_dbg(&slot->mmc->class_dev, "card %s\n", |
| present ? "inserted" : "removed"); |
| |
| spin_lock(&host->lock); |
| |
| if (!present) |
| clear_bit(ATMCI_CARD_PRESENT, &slot->flags); |
| else |
| set_bit(ATMCI_CARD_PRESENT, &slot->flags); |
| |
| /* Clean up queue if present */ |
| mrq = slot->mrq; |
| if (mrq) { |
| if (mrq == host->mrq) { |
| /* |
| * Reset controller to terminate any ongoing |
| * commands or data transfers. |
| */ |
| atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST); |
| atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN); |
| atmci_writel(host, ATMCI_MR, host->mode_reg); |
| if (host->caps.has_cfg_reg) |
| atmci_writel(host, ATMCI_CFG, host->cfg_reg); |
| |
| host->data = NULL; |
| host->cmd = NULL; |
| |
| switch (host->state) { |
| case STATE_IDLE: |
| break; |
| case STATE_SENDING_CMD: |
| mrq->cmd->error = -ENOMEDIUM; |
| if (mrq->data) |
| host->stop_transfer(host); |
| break; |
| case STATE_DATA_XFER: |
| mrq->data->error = -ENOMEDIUM; |
| host->stop_transfer(host); |
| break; |
| case STATE_WAITING_NOTBUSY: |
| mrq->data->error = -ENOMEDIUM; |
| break; |
| case STATE_SENDING_STOP: |
| mrq->stop->error = -ENOMEDIUM; |
| break; |
| case STATE_END_REQUEST: |
| break; |
| } |
| |
| atmci_request_end(host, mrq); |
| } else { |
| list_del(&slot->queue_node); |
| mrq->cmd->error = -ENOMEDIUM; |
| if (mrq->data) |
| mrq->data->error = -ENOMEDIUM; |
| if (mrq->stop) |
| mrq->stop->error = -ENOMEDIUM; |
| |
| spin_unlock(&host->lock); |
| mmc_request_done(slot->mmc, mrq); |
| spin_lock(&host->lock); |
| } |
| } |
| spin_unlock(&host->lock); |
| |
| mmc_detect_change(slot->mmc, 0); |
| } |
| } |
| |
| static void atmci_tasklet_func(unsigned long priv) |
| { |
| struct atmel_mci *host = (struct atmel_mci *)priv; |
| struct mmc_request *mrq = host->mrq; |
| struct mmc_data *data = host->data; |
| enum atmel_mci_state state = host->state; |
| enum atmel_mci_state prev_state; |
| u32 status; |
| |
| spin_lock(&host->lock); |
| |
| state = host->state; |
| |
| dev_vdbg(&host->pdev->dev, |
| "tasklet: state %u pending/completed/mask %lx/%lx/%x\n", |
| state, host->pending_events, host->completed_events, |
| atmci_readl(host, ATMCI_IMR)); |
| |
| do { |
| prev_state = state; |
| dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state); |
| |
| switch (state) { |
| case STATE_IDLE: |
| break; |
| |
| case STATE_SENDING_CMD: |
| /* |
| * Command has been sent, we are waiting for command |
| * ready. Then we have three next states possible: |
| * END_REQUEST by default, WAITING_NOTBUSY if it's a |
| * command needing it or DATA_XFER if there is data. |
| */ |
| dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n"); |
| if (!atmci_test_and_clear_pending(host, |
| EVENT_CMD_RDY)) |
| break; |
| |
| dev_dbg(&host->pdev->dev, "set completed cmd ready\n"); |
| host->cmd = NULL; |
| atmci_set_completed(host, EVENT_CMD_RDY); |
| atmci_command_complete(host, mrq->cmd); |
| if (mrq->data) { |
| dev_dbg(&host->pdev->dev, |
| "command with data transfer"); |
| /* |
| * If there is a command error don't start |
| * data transfer. |
| */ |
| if (mrq->cmd->error) { |
| host->stop_transfer(host); |
| host->data = NULL; |
| atmci_writel(host, ATMCI_IDR, |
| ATMCI_TXRDY | ATMCI_RXRDY |
| | ATMCI_DATA_ERROR_FLAGS); |
| state = STATE_END_REQUEST; |
| } else |
| state = STATE_DATA_XFER; |
| } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) { |
| dev_dbg(&host->pdev->dev, |
| "command response need waiting notbusy"); |
| atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY); |
| state = STATE_WAITING_NOTBUSY; |
| } else |
| state = STATE_END_REQUEST; |
| |
| break; |
| |
| case STATE_DATA_XFER: |
| if (atmci_test_and_clear_pending(host, |
| EVENT_DATA_ERROR)) { |
| dev_dbg(&host->pdev->dev, "set completed data error\n"); |
| atmci_set_completed(host, EVENT_DATA_ERROR); |
| state = STATE_END_REQUEST; |
| break; |
| } |
| |
| /* |
| * A data transfer is in progress. The event expected |
| * to move to the next state depends of data transfer |
| * type (PDC or DMA). Once transfer done we can move |
| * to the next step which is WAITING_NOTBUSY in write |
| * case and directly SENDING_STOP in read case. |
| */ |
| dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n"); |
| if (!atmci_test_and_clear_pending(host, |
| EVENT_XFER_COMPLETE)) |
| break; |
| |
| dev_dbg(&host->pdev->dev, |
| "(%s) set completed xfer complete\n", |
| __func__); |
| atmci_set_completed(host, EVENT_XFER_COMPLETE); |
| |
| if (host->caps.need_notbusy_for_read_ops || |
| (host->data->flags & MMC_DATA_WRITE)) { |
| atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY); |
| state = STATE_WAITING_NOTBUSY; |
| } else if (host->mrq->stop) { |
| atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY); |
| atmci_send_stop_cmd(host, data); |
| state = STATE_SENDING_STOP; |
| } else { |
| host->data = NULL; |
| data->bytes_xfered = data->blocks * data->blksz; |
| data->error = 0; |
| state = STATE_END_REQUEST; |
| } |
| break; |
| |
| case STATE_WAITING_NOTBUSY: |
| /* |
| * We can be in the state for two reasons: a command |
| * requiring waiting not busy signal (stop command |
| * included) or a write operation. In the latest case, |
| * we need to send a stop command. |
| */ |
| dev_dbg(&host->pdev->dev, "FSM: not busy?\n"); |
| if (!atmci_test_and_clear_pending(host, |
| EVENT_NOTBUSY)) |
| break; |
| |
| dev_dbg(&host->pdev->dev, "set completed not busy\n"); |
| atmci_set_completed(host, EVENT_NOTBUSY); |
| |
| if (host->data) { |
| /* |
| * For some commands such as CMD53, even if |
| * there is data transfer, there is no stop |
| * command to send. |
| */ |
| if (host->mrq->stop) { |
| atmci_writel(host, ATMCI_IER, |
| ATMCI_CMDRDY); |
| atmci_send_stop_cmd(host, data); |
| state = STATE_SENDING_STOP; |
| } else { |
| host->data = NULL; |
| data->bytes_xfered = data->blocks |
| * data->blksz; |
| data->error = 0; |
| state = STATE_END_REQUEST; |
| } |
| } else |
| state = STATE_END_REQUEST; |
| break; |
| |
| case STATE_SENDING_STOP: |
| /* |
| * In this state, it is important to set host->data to |
| * NULL (which is tested in the waiting notbusy state) |
| * in order to go to the end request state instead of |
| * sending stop again. |
| */ |
| dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n"); |
| if (!atmci_test_and_clear_pending(host, |
| EVENT_CMD_RDY)) |
| break; |
| |
| dev_dbg(&host->pdev->dev, "FSM: cmd ready\n"); |
| host->cmd = NULL; |
| data->bytes_xfered = data->blocks * data->blksz; |
| data->error = 0; |
| atmci_command_complete(host, mrq->stop); |
| if (mrq->stop->error) { |
| host->stop_transfer(host); |
| atmci_writel(host, ATMCI_IDR, |
| ATMCI_TXRDY | ATMCI_RXRDY |
| | ATMCI_DATA_ERROR_FLAGS); |
| state = STATE_END_REQUEST; |
| } else { |
| atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY); |
| state = STATE_WAITING_NOTBUSY; |
| } |
| host->data = NULL; |
| break; |
| |
| case STATE_END_REQUEST: |
| atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY |
| | ATMCI_DATA_ERROR_FLAGS); |
| status = host->data_status; |
| if (unlikely(status)) { |
| host->stop_transfer(host); |
| host->data = NULL; |
| if (status & ATMCI_DTOE) { |
| data->error = -ETIMEDOUT; |
| } else if (status & ATMCI_DCRCE) { |
| data->error = -EILSEQ; |
| } else { |
| data->error = -EIO; |
| } |
| } |
| |
| atmci_request_end(host, host->mrq); |
| state = STATE_IDLE; |
| break; |
| } |
| } while (state != prev_state); |
| |
| host->state = state; |
| |
| spin_unlock(&host->lock); |
| } |
| |
| 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 = atmci_readl(host, ATMCI_RDR); |
| if (likely(offset + 4 <= sg->length)) { |
| put_unaligned(value, (u32 *)(buf + offset)); |
| |
| offset += 4; |
| nbytes += 4; |
| |
| if (offset == sg->length) { |
| flush_dcache_page(sg_page(sg)); |
| 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 = atmci_readl(host, ATMCI_SR); |
| if (status & ATMCI_DATA_ERROR_FLAGS) { |
| atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY |
| | ATMCI_DATA_ERROR_FLAGS)); |
| host->data_status = status; |
| data->bytes_xfered += nbytes; |
| return; |
| } |
| } while (status & ATMCI_RXRDY); |
| |
| host->pio_offset = offset; |
| data->bytes_xfered += nbytes; |
| |
| return; |
| |
| done: |
| atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY); |
| atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY); |
| data->bytes_xfered += nbytes; |
| smp_wmb(); |
| atmci_set_pending(host, EVENT_XFER_COMPLETE); |
| } |
| |
| 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)); |
| atmci_writel(host, ATMCI_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) { |
| atmci_writel(host, ATMCI_TDR, value); |
| goto done; |
| } |
| |
| offset = 4 - remaining; |
| buf = sg_virt(sg); |
| memcpy((u8 *)&value + remaining, buf, offset); |
| atmci_writel(host, ATMCI_TDR, value); |
| nbytes += offset; |
| } |
| |
| status = atmci_readl(host, ATMCI_SR); |
| if (status & ATMCI_DATA_ERROR_FLAGS) { |
| atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY |
| | ATMCI_DATA_ERROR_FLAGS)); |
| host->data_status = status; |
| data->bytes_xfered += nbytes; |
| return; |
| } |
| } while (status & ATMCI_TXRDY); |
| |
| host->pio_offset = offset; |
| data->bytes_xfered += nbytes; |
| |
| return; |
| |
| done: |
| atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY); |
| atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY); |
| data->bytes_xfered += nbytes; |
| smp_wmb(); |
| atmci_set_pending(host, EVENT_XFER_COMPLETE); |
| } |
| |
| static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status) |
| { |
| int i; |
| |
| for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) { |
| struct atmel_mci_slot *slot = host->slot[i]; |
| if (slot && (status & slot->sdio_irq)) { |
| mmc_signal_sdio_irq(slot->mmc); |
| } |
| } |
| } |
| |
| |
| static irqreturn_t atmci_interrupt(int irq, void *dev_id) |
| { |
| struct atmel_mci *host = dev_id; |
| u32 status, mask, pending; |
| unsigned int pass_count = 0; |
| |
| do { |
| status = atmci_readl(host, ATMCI_SR); |
| mask = atmci_readl(host, ATMCI_IMR); |
| pending = status & mask; |
| if (!pending) |
| break; |
| |
| if (pending & ATMCI_DATA_ERROR_FLAGS) { |
| dev_dbg(&host->pdev->dev, "IRQ: data error\n"); |
| atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS |
| | ATMCI_RXRDY | ATMCI_TXRDY |
| | ATMCI_ENDRX | ATMCI_ENDTX |
| | ATMCI_RXBUFF | ATMCI_TXBUFE); |
| |
| host->data_status = status; |
| dev_dbg(&host->pdev->dev, "set pending data error\n"); |
| smp_wmb(); |
| atmci_set_pending(host, EVENT_DATA_ERROR); |
| tasklet_schedule(&host->tasklet); |
| } |
| |
| if (pending & ATMCI_TXBUFE) { |
| dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n"); |
| atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE); |
| atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX); |
| /* |
| * We can receive this interruption before having configured |
| * the second pdc buffer, so we need to reconfigure first and |
| * second buffers again |
| */ |
| if (host->data_size) { |
| atmci_pdc_set_both_buf(host, XFER_TRANSMIT); |
| atmci_writel(host, ATMCI_IER, ATMCI_ENDTX); |
| atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE); |
| } else { |
| atmci_pdc_complete(host); |
| } |
| } else if (pending & ATMCI_ENDTX) { |
| dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n"); |
| atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX); |
| |
| if (host->data_size) { |
| atmci_pdc_set_single_buf(host, |
| XFER_TRANSMIT, PDC_SECOND_BUF); |
| atmci_writel(host, ATMCI_IER, ATMCI_ENDTX); |
| } |
| } |
| |
| if (pending & ATMCI_RXBUFF) { |
| dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n"); |
| atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF); |
| atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX); |
| /* |
| * We can receive this interruption before having configured |
| * the second pdc buffer, so we need to reconfigure first and |
| * second buffers again |
| */ |
| if (host->data_size) { |
| atmci_pdc_set_both_buf(host, XFER_RECEIVE); |
| atmci_writel(host, ATMCI_IER, ATMCI_ENDRX); |
| atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF); |
| } else { |
| atmci_pdc_complete(host); |
| } |
| } else if (pending & ATMCI_ENDRX) { |
| dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n"); |
| atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX); |
| |
| if (host->data_size) { |
| atmci_pdc_set_single_buf(host, |
| XFER_RECEIVE, PDC_SECOND_BUF); |
| atmci_writel(host, ATMCI_IER, ATMCI_ENDRX); |
| } |
| } |
| |
| /* |
| * First mci IPs, so mainly the ones having pdc, have some |
| * issues with the notbusy signal. You can't get it after |
| * data transmission if you have not sent a stop command. |
| * The appropriate workaround is to use the BLKE signal. |
| */ |
| if (pending & ATMCI_BLKE) { |
| dev_dbg(&host->pdev->dev, "IRQ: blke\n"); |
| atmci_writel(host, ATMCI_IDR, ATMCI_BLKE); |
| smp_wmb(); |
| dev_dbg(&host->pdev->dev, "set pending notbusy\n"); |
| atmci_set_pending(host, EVENT_NOTBUSY); |
| tasklet_schedule(&host->tasklet); |
| } |
| |
| if (pending & ATMCI_NOTBUSY) { |
| dev_dbg(&host->pdev->dev, "IRQ: not_busy\n"); |
| atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY); |
| smp_wmb(); |
| dev_dbg(&host->pdev->dev, "set pending notbusy\n"); |
| atmci_set_pending(host, EVENT_NOTBUSY); |
| tasklet_schedule(&host->tasklet); |
| } |
| |
| if (pending & ATMCI_RXRDY) |
| atmci_read_data_pio(host); |
| if (pending & ATMCI_TXRDY) |
| atmci_write_data_pio(host); |
| |
| if (pending & ATMCI_CMDRDY) { |
| dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n"); |
| atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY); |
| host->cmd_status = status; |
| smp_wmb(); |
| dev_dbg(&host->pdev->dev, "set pending cmd rdy\n"); |
| atmci_set_pending(host, EVENT_CMD_RDY); |
| tasklet_schedule(&host->tasklet); |
| } |
| |
| if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB)) |
| atmci_sdio_interrupt(host, status); |
| |
| } while (pass_count++ < 5); |
| |
| return pass_count ? IRQ_HANDLED : IRQ_NONE; |
| } |
| |
| static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id) |
| { |
| struct atmel_mci_slot *slot = dev_id; |
| |
| /* |
| * 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(&slot->detect_timer, jiffies + msecs_to_jiffies(20)); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int __init atmci_init_slot(struct atmel_mci *host, |
| struct mci_slot_pdata *slot_data, unsigned int id, |
| u32 sdc_reg, u32 sdio_irq) |
| { |
| struct mmc_host *mmc; |
| struct atmel_mci_slot *slot; |
| |
| mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev); |
| if (!mmc) |
| return -ENOMEM; |
| |
| slot = mmc_priv(mmc); |
| slot->mmc = mmc; |
| slot->host = host; |
| slot->detect_pin = slot_data->detect_pin; |
| slot->wp_pin = slot_data->wp_pin; |
| slot->detect_is_active_high = slot_data->detect_is_active_high; |
| slot->sdc_reg = sdc_reg; |
| slot->sdio_irq = sdio_irq; |
| |
| dev_dbg(&mmc->class_dev, |
| "slot[%u]: bus_width=%u, detect_pin=%d, " |
| "detect_is_active_high=%s, wp_pin=%d\n", |
| id, slot_data->bus_width, slot_data->detect_pin, |
| slot_data->detect_is_active_high ? "true" : "false", |
| slot_data->wp_pin); |
| |
| mmc->ops = &atmci_ops; |
| mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512); |
| mmc->f_max = host->bus_hz / 2; |
| mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; |
| if (sdio_irq) |
| mmc->caps |= MMC_CAP_SDIO_IRQ; |
| if (host->caps.has_highspeed) |
| mmc->caps |= MMC_CAP_SD_HIGHSPEED; |
| /* |
| * Without the read/write proof capability, it is strongly suggested to |
| * use only one bit for data to prevent fifo underruns and overruns |
| * which will corrupt data. |
| */ |
| if ((slot_data->bus_width >= 4) && host->caps.has_rwproof) |
| mmc->caps |= MMC_CAP_4_BIT_DATA; |
| |
| if (atmci_get_version(host) < 0x200) { |
| mmc->max_segs = 256; |
| mmc->max_blk_size = 4095; |
| mmc->max_blk_count = 256; |
| mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; |
| mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs; |
| } else { |
| mmc->max_segs = 64; |
| mmc->max_req_size = 32768 * 512; |
| mmc->max_blk_size = 32768; |
| mmc->max_blk_count = 512; |
| } |
| |
| /* Assume card is present initially */ |
| set_bit(ATMCI_CARD_PRESENT, &slot->flags); |
| if (gpio_is_valid(slot->detect_pin)) { |
| if (gpio_request(slot->detect_pin, "mmc_detect")) { |
| dev_dbg(&mmc->class_dev, "no detect pin available\n"); |
| slot->detect_pin = -EBUSY; |
| } else if (gpio_get_value(slot->detect_pin) ^ |
| slot->detect_is_active_high) { |
| clear_bit(ATMCI_CARD_PRESENT, &slot->flags); |
| } |
| } |
| |
| if (!gpio_is_valid(slot->detect_pin)) |
| mmc->caps |= MMC_CAP_NEEDS_POLL; |
| |
| if (gpio_is_valid(slot->wp_pin)) { |
| if (gpio_request(slot->wp_pin, "mmc_wp")) { |
| dev_dbg(&mmc->class_dev, "no WP pin available\n"); |
| slot->wp_pin = -EBUSY; |
| } |
| } |
| |
| host->slot[id] = slot; |
| mmc_add_host(mmc); |
| |
| if (gpio_is_valid(slot->detect_pin)) { |
| int ret; |
| |
| setup_timer(&slot->detect_timer, atmci_detect_change, |
| (unsigned long)slot); |
| |
| ret = request_irq(gpio_to_irq(slot->detect_pin), |
| atmci_detect_interrupt, |
| IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, |
| "mmc-detect", slot); |
| if (ret) { |
| dev_dbg(&mmc->class_dev, |
| "could not request IRQ %d for detect pin\n", |
| gpio_to_irq(slot->detect_pin)); |
| gpio_free(slot->detect_pin); |
| slot->detect_pin = -EBUSY; |
| } |
| } |
| |
| atmci_init_debugfs(slot); |
| |
| return 0; |
| } |
| |
| static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot, |
| unsigned int id) |
| { |
| /* Debugfs stuff is cleaned up by mmc core */ |
| |
| set_bit(ATMCI_SHUTDOWN, &slot->flags); |
| smp_wmb(); |
| |
| mmc_remove_host(slot->mmc); |
| |
| if (gpio_is_valid(slot->detect_pin)) { |
| int pin = slot->detect_pin; |
| |
| free_irq(gpio_to_irq(pin), slot); |
| del_timer_sync(&slot->detect_timer); |
| gpio_free(pin); |
| } |
| if (gpio_is_valid(slot->wp_pin)) |
| gpio_free(slot->wp_pin); |
| |
| slot->host->slot[id] = NULL; |
| mmc_free_host(slot->mmc); |
| } |
| |
| static bool atmci_filter(struct dma_chan *chan, void *slave) |
| { |
| struct mci_dma_data *sl = slave; |
| |
| if (sl && find_slave_dev(sl) == chan->device->dev) { |
| chan->private = slave_data_ptr(sl); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| static bool atmci_configure_dma(struct atmel_mci *host) |
| { |
| struct mci_platform_data *pdata; |
| |
| if (host == NULL) |
| return false; |
| |
| pdata = host->pdev->dev.platform_data; |
| |
| if (!pdata) |
| return false; |
| |
| if (pdata->dma_slave && find_slave_dev(pdata->dma_slave)) { |
| dma_cap_mask_t mask; |
| |
| /* Try to grab a DMA channel */ |
| dma_cap_zero(mask); |
| dma_cap_set(DMA_SLAVE, mask); |
| host->dma.chan = |
| dma_request_channel(mask, atmci_filter, pdata->dma_slave); |
| } |
| if (!host->dma.chan) { |
| dev_warn(&host->pdev->dev, "no DMA channel available\n"); |
| return false; |
| } else { |
| dev_info(&host->pdev->dev, |
| "using %s for DMA transfers\n", |
| dma_chan_name(host->dma.chan)); |
| |
| host->dma_conf.src_addr = host->mapbase + ATMCI_RDR; |
| host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
| host->dma_conf.src_maxburst = 1; |
| host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR; |
| host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
| host->dma_conf.dst_maxburst = 1; |
| host->dma_conf.device_fc = false; |
| return true; |
| } |
| } |
| |
| /* |
| * HSMCI (High Speed MCI) module is not fully compatible with MCI module. |
| * HSMCI provides DMA support and a new config register but no more supports |
| * PDC. |
| */ |
| static void __init atmci_get_cap(struct atmel_mci *host) |
| { |
| unsigned int version; |
| |
| version = atmci_get_version(host); |
| dev_info(&host->pdev->dev, |
| "version: 0x%x\n", version); |
| |
| host->caps.has_dma_conf_reg = 0; |
| host->caps.has_pdc = ATMCI_PDC_CONNECTED; |
| host->caps.has_cfg_reg = 0; |
| host->caps.has_cstor_reg = 0; |
| host->caps.has_highspeed = 0; |
| host->caps.has_rwproof = 0; |
| host->caps.has_odd_clk_div = 0; |
| host->caps.has_bad_data_ordering = 1; |
| host->caps.need_reset_after_xfer = 1; |
| host->caps.need_blksz_mul_4 = 1; |
| host->caps.need_notbusy_for_read_ops = 0; |
| |
| /* keep only major version number */ |
| switch (version & 0xf00) { |
| case 0x500: |
| host->caps.has_odd_clk_div = 1; |
| case 0x400: |
| case 0x300: |
| host->caps.has_dma_conf_reg = 1; |
| host->caps.has_pdc = 0; |
| host->caps.has_cfg_reg = 1; |
| host->caps.has_cstor_reg = 1; |
| host->caps.has_highspeed = 1; |
| case 0x200: |
| host->caps.has_rwproof = 1; |
| host->caps.need_blksz_mul_4 = 0; |
| host->caps.need_notbusy_for_read_ops = 1; |
| case 0x100: |
| host->caps.has_bad_data_ordering = 0; |
| host->caps.need_reset_after_xfer = 0; |
| case 0x0: |
| break; |
| default: |
| host->caps.has_pdc = 0; |
| dev_warn(&host->pdev->dev, |
| "Unmanaged mci version, set minimum capabilities\n"); |
| break; |
| } |
| } |
| |
| static int __init atmci_probe(struct platform_device *pdev) |
| { |
| struct mci_platform_data *pdata; |
| struct atmel_mci *host; |
| struct resource *regs; |
| unsigned int nr_slots; |
| int irq; |
| int ret; |
| |
| regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!regs) |
| return -ENXIO; |
| pdata = pdev->dev.platform_data; |
| if (!pdata) { |
| pdata = atmci_of_init(pdev); |
| if (IS_ERR(pdata)) { |
| dev_err(&pdev->dev, "platform data not available\n"); |
| return PTR_ERR(pdata); |
| } |
| } |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) |
| return irq; |
| |
| host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL); |
| if (!host) |
| return -ENOMEM; |
| |
| host->pdev = pdev; |
| spin_lock_init(&host->lock); |
| INIT_LIST_HEAD(&host->queue); |
| |
| 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, resource_size(regs)); |
| if (!host->regs) |
| goto err_ioremap; |
| |
| clk_enable(host->mck); |
| atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST); |
| host->bus_hz = clk_get_rate(host->mck); |
| clk_disable(host->mck); |
| |
| host->mapbase = regs->start; |
| |
| tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host); |
| |
| ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host); |
| if (ret) |
| goto err_request_irq; |
| |
| /* Get MCI capabilities and set operations according to it */ |
| atmci_get_cap(host); |
| if (atmci_configure_dma(host)) { |
| host->prepare_data = &atmci_prepare_data_dma; |
| host->submit_data = &atmci_submit_data_dma; |
| host->stop_transfer = &atmci_stop_transfer_dma; |
| } else if (host->caps.has_pdc) { |
| dev_info(&pdev->dev, "using PDC\n"); |
| host->prepare_data = &atmci_prepare_data_pdc; |
| host->submit_data = &atmci_submit_data_pdc; |
| host->stop_transfer = &atmci_stop_transfer_pdc; |
| } else { |
| dev_info(&pdev->dev, "using PIO\n"); |
| host->prepare_data = &atmci_prepare_data; |
| host->submit_data = &atmci_submit_data; |
| host->stop_transfer = &atmci_stop_transfer; |
| } |
| |
| platform_set_drvdata(pdev, host); |
| |
| setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host); |
| |
| /* We need at least one slot to succeed */ |
| nr_slots = 0; |
| ret = -ENODEV; |
| if (pdata->slot[0].bus_width) { |
| ret = atmci_init_slot(host, &pdata->slot[0], |
| 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA); |
| if (!ret) { |
| nr_slots++; |
| host->buf_size = host->slot[0]->mmc->max_req_size; |
| } |
| } |
| if (pdata->slot[1].bus_width) { |
| ret = atmci_init_slot(host, &pdata->slot[1], |
| 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB); |
| if (!ret) { |
| nr_slots++; |
| if (host->slot[1]->mmc->max_req_size > host->buf_size) |
| host->buf_size = |
| host->slot[1]->mmc->max_req_size; |
| } |
| } |
| |
| if (!nr_slots) { |
| dev_err(&pdev->dev, "init failed: no slot defined\n"); |
| goto err_init_slot; |
| } |
| |
| if (!host->caps.has_rwproof) { |
| host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size, |
| &host->buf_phys_addr, |
| GFP_KERNEL); |
| if (!host->buffer) { |
| ret = -ENOMEM; |
| dev_err(&pdev->dev, "buffer allocation failed\n"); |
| goto err_init_slot; |
| } |
| } |
| |
| dev_info(&pdev->dev, |
| "Atmel MCI controller at 0x%08lx irq %d, %u slots\n", |
| host->mapbase, irq, nr_slots); |
| |
| return 0; |
| |
| err_init_slot: |
| if (host->dma.chan) |
| dma_release_channel(host->dma.chan); |
| free_irq(irq, host); |
| err_request_irq: |
| iounmap(host->regs); |
| err_ioremap: |
| clk_put(host->mck); |
| err_clk_get: |
| kfree(host); |
| return ret; |
| } |
| |
| static int __exit atmci_remove(struct platform_device *pdev) |
| { |
| struct atmel_mci *host = platform_get_drvdata(pdev); |
| unsigned int i; |
| |
| platform_set_drvdata(pdev, NULL); |
| |
| if (host->buffer) |
| dma_free_coherent(&pdev->dev, host->buf_size, |
| host->buffer, host->buf_phys_addr); |
| |
| for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) { |
| if (host->slot[i]) |
| atmci_cleanup_slot(host->slot[i], i); |
| } |
| |
| clk_enable(host->mck); |
| atmci_writel(host, ATMCI_IDR, ~0UL); |
| atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS); |
| atmci_readl(host, ATMCI_SR); |
| clk_disable(host->mck); |
| |
| #ifdef CONFIG_MMC_ATMELMCI_DMA |
| if (host->dma.chan) |
| dma_release_channel(host->dma.chan); |
| #endif |
| |
| free_irq(platform_get_irq(pdev, 0), host); |
| iounmap(host->regs); |
| |
| clk_put(host->mck); |
| kfree(host); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int atmci_suspend(struct device *dev) |
| { |
| struct atmel_mci *host = dev_get_drvdata(dev); |
| int i; |
| |
| for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) { |
| struct atmel_mci_slot *slot = host->slot[i]; |
| int ret; |
| |
| if (!slot) |
| continue; |
| ret = mmc_suspend_host(slot->mmc); |
| if (ret < 0) { |
| while (--i >= 0) { |
| slot = host->slot[i]; |
| if (slot |
| && test_bit(ATMCI_SUSPENDED, &slot->flags)) { |
| mmc_resume_host(host->slot[i]->mmc); |
| clear_bit(ATMCI_SUSPENDED, &slot->flags); |
| } |
| } |
| return ret; |
| } else { |
| set_bit(ATMCI_SUSPENDED, &slot->flags); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int atmci_resume(struct device *dev) |
| { |
| struct atmel_mci *host = dev_get_drvdata(dev); |
| int i; |
| int ret = 0; |
| |
| for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) { |
| struct atmel_mci_slot *slot = host->slot[i]; |
| int err; |
| |
| slot = host->slot[i]; |
| if (!slot) |
| continue; |
| if (!test_bit(ATMCI_SUSPENDED, &slot->flags)) |
| continue; |
| err = mmc_resume_host(slot->mmc); |
| if (err < 0) |
| ret = err; |
| else |
| clear_bit(ATMCI_SUSPENDED, &slot->flags); |
| } |
| |
| return ret; |
| } |
| static SIMPLE_DEV_PM_OPS(atmci_pm, atmci_suspend, atmci_resume); |
| #define ATMCI_PM_OPS (&atmci_pm) |
| #else |
| #define ATMCI_PM_OPS NULL |
| #endif |
| |
| static struct platform_driver atmci_driver = { |
| .remove = __exit_p(atmci_remove), |
| .driver = { |
| .name = "atmel_mci", |
| .pm = ATMCI_PM_OPS, |
| .of_match_table = of_match_ptr(atmci_dt_ids), |
| }, |
| }; |
| |
| 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); |
| } |
| |
| late_initcall(atmci_init); /* try to load after dma driver when built-in */ |
| module_exit(atmci_exit); |
| |
| MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver"); |
| MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); |
| MODULE_LICENSE("GPL v2"); |