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android-kvm / linux / 3df9427f351a9cb8aee0eea13d185f0d78340a70 / . / drivers / mmc / host / atmel-mci.c
blob: 6490df54a6f55b17abf361f250082df5212d8d77 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Atmel MultiMedia Card Interface driver
*
* Copyright (C) 2004-2008 Atmel Corporation
*/
#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/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/irq.h>
#include <linux/gpio/consumer.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 <linux/atmel_pdc.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/pinctrl/consumer.h>
#include <linux/workqueue.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/unaligned.h>
#define ATMCI_MAX_NR_SLOTS 2
/*
* Superset of MCI IP registers integrated in Atmel AT91 Processor
* Registers and bitfields marked with [2] are only available in MCI2
*/
/* MCI Register Definitions */
#define ATMCI_CR 0x0000 /* Control */
#define ATMCI_CR_MCIEN BIT(0) /* MCI Enable */
#define ATMCI_CR_MCIDIS BIT(1) /* MCI Disable */
#define ATMCI_CR_PWSEN BIT(2) /* Power Save Enable */
#define ATMCI_CR_PWSDIS BIT(3) /* Power Save Disable */
#define ATMCI_CR_SWRST BIT(7) /* Software Reset */
#define ATMCI_MR 0x0004 /* Mode */
#define ATMCI_MR_CLKDIV(x) ((x) << 0) /* Clock Divider */
#define ATMCI_MR_PWSDIV(x) ((x) << 8) /* Power Saving Divider */
#define ATMCI_MR_RDPROOF BIT(11) /* Read Proof */
#define ATMCI_MR_WRPROOF BIT(12) /* Write Proof */
#define ATMCI_MR_PDCFBYTE BIT(13) /* Force Byte Transfer */
#define ATMCI_MR_PDCPADV BIT(14) /* Padding Value */
#define ATMCI_MR_PDCMODE BIT(15) /* PDC-oriented Mode */
#define ATMCI_MR_CLKODD(x) ((x) << 16) /* LSB of Clock Divider */
#define ATMCI_DTOR 0x0008 /* Data Timeout */
#define ATMCI_DTOCYC(x) ((x) << 0) /* Data Timeout Cycles */
#define ATMCI_DTOMUL(x) ((x) << 4) /* Data Timeout Multiplier */
#define ATMCI_SDCR 0x000c /* SD Card / SDIO */
#define ATMCI_SDCSEL_SLOT_A (0 << 0) /* Select SD slot A */
#define ATMCI_SDCSEL_SLOT_B (1 << 0) /* Select SD slot A */
#define ATMCI_SDCSEL_MASK (3 << 0)
#define ATMCI_SDCBUS_1BIT (0 << 6) /* 1-bit data bus */
#define ATMCI_SDCBUS_4BIT (2 << 6) /* 4-bit data bus */
#define ATMCI_SDCBUS_8BIT (3 << 6) /* 8-bit data bus[2] */
#define ATMCI_SDCBUS_MASK (3 << 6)
#define ATMCI_ARGR 0x0010 /* Command Argument */
#define ATMCI_CMDR 0x0014 /* Command */
#define ATMCI_CMDR_CMDNB(x) ((x) << 0) /* Command Opcode */
#define ATMCI_CMDR_RSPTYP_NONE (0 << 6) /* No response */
#define ATMCI_CMDR_RSPTYP_48BIT (1 << 6) /* 48-bit response */
#define ATMCI_CMDR_RSPTYP_136BIT (2 << 6) /* 136-bit response */
#define ATMCI_CMDR_SPCMD_INIT (1 << 8) /* Initialization command */
#define ATMCI_CMDR_SPCMD_SYNC (2 << 8) /* Synchronized command */
#define ATMCI_CMDR_SPCMD_INT (4 << 8) /* Interrupt command */
#define ATMCI_CMDR_SPCMD_INTRESP (5 << 8) /* Interrupt response */
#define ATMCI_CMDR_OPDCMD (1 << 11) /* Open Drain */
#define ATMCI_CMDR_MAXLAT_5CYC (0 << 12) /* Max latency 5 cycles */
#define ATMCI_CMDR_MAXLAT_64CYC (1 << 12) /* Max latency 64 cycles */
#define ATMCI_CMDR_START_XFER (1 << 16) /* Start data transfer */
#define ATMCI_CMDR_STOP_XFER (2 << 16) /* Stop data transfer */
#define ATMCI_CMDR_TRDIR_WRITE (0 << 18) /* Write data */
#define ATMCI_CMDR_TRDIR_READ (1 << 18) /* Read data */
#define ATMCI_CMDR_BLOCK (0 << 19) /* Single-block transfer */
#define ATMCI_CMDR_MULTI_BLOCK (1 << 19) /* Multi-block transfer */
#define ATMCI_CMDR_STREAM (2 << 19) /* MMC Stream transfer */
#define ATMCI_CMDR_SDIO_BYTE (4 << 19) /* SDIO Byte transfer */
#define ATMCI_CMDR_SDIO_BLOCK (5 << 19) /* SDIO Block transfer */
#define ATMCI_CMDR_SDIO_SUSPEND (1 << 24) /* SDIO Suspend Command */
#define ATMCI_CMDR_SDIO_RESUME (2 << 24) /* SDIO Resume Command */
#define ATMCI_BLKR 0x0018 /* Block */
#define ATMCI_BCNT(x) ((x) << 0) /* Data Block Count */
#define ATMCI_BLKLEN(x) ((x) << 16) /* Data Block Length */
#define ATMCI_CSTOR 0x001c /* Completion Signal Timeout[2] */
#define ATMCI_CSTOCYC(x) ((x) << 0) /* CST cycles */
#define ATMCI_CSTOMUL(x) ((x) << 4) /* CST multiplier */
#define ATMCI_RSPR 0x0020 /* Response 0 */
#define ATMCI_RSPR1 0x0024 /* Response 1 */
#define ATMCI_RSPR2 0x0028 /* Response 2 */
#define ATMCI_RSPR3 0x002c /* Response 3 */
#define ATMCI_RDR 0x0030 /* Receive Data */
#define ATMCI_TDR 0x0034 /* Transmit Data */
#define ATMCI_SR 0x0040 /* Status */
#define ATMCI_IER 0x0044 /* Interrupt Enable */
#define ATMCI_IDR 0x0048 /* Interrupt Disable */
#define ATMCI_IMR 0x004c /* Interrupt Mask */
#define ATMCI_CMDRDY BIT(0) /* Command Ready */
#define ATMCI_RXRDY BIT(1) /* Receiver Ready */
#define ATMCI_TXRDY BIT(2) /* Transmitter Ready */
#define ATMCI_BLKE BIT(3) /* Data Block Ended */
#define ATMCI_DTIP BIT(4) /* Data Transfer In Progress */
#define ATMCI_NOTBUSY BIT(5) /* Data Not Busy */
#define ATMCI_ENDRX BIT(6) /* End of RX Buffer */
#define ATMCI_ENDTX BIT(7) /* End of TX Buffer */
#define ATMCI_SDIOIRQA BIT(8) /* SDIO IRQ in slot A */
#define ATMCI_SDIOIRQB BIT(9) /* SDIO IRQ in slot B */
#define ATMCI_SDIOWAIT BIT(12) /* SDIO Read Wait Operation Status */
#define ATMCI_CSRCV BIT(13) /* CE-ATA Completion Signal Received */
#define ATMCI_RXBUFF BIT(14) /* RX Buffer Full */
#define ATMCI_TXBUFE BIT(15) /* TX Buffer Empty */
#define ATMCI_RINDE BIT(16) /* Response Index Error */
#define ATMCI_RDIRE BIT(17) /* Response Direction Error */
#define ATMCI_RCRCE BIT(18) /* Response CRC Error */
#define ATMCI_RENDE BIT(19) /* Response End Bit Error */
#define ATMCI_RTOE BIT(20) /* Response Time-Out Error */
#define ATMCI_DCRCE BIT(21) /* Data CRC Error */
#define ATMCI_DTOE BIT(22) /* Data Time-Out Error */
#define ATMCI_CSTOE BIT(23) /* Completion Signal Time-out Error */
#define ATMCI_BLKOVRE BIT(24) /* DMA Block Overrun Error */
#define ATMCI_DMADONE BIT(25) /* DMA Transfer Done */
#define ATMCI_FIFOEMPTY BIT(26) /* FIFO Empty Flag */
#define ATMCI_XFRDONE BIT(27) /* Transfer Done Flag */
#define ATMCI_ACKRCV BIT(28) /* Boot Operation Acknowledge Received */
#define ATMCI_ACKRCVE BIT(29) /* Boot Operation Acknowledge Error */
#define ATMCI_OVRE BIT(30) /* RX Overrun Error */
#define ATMCI_UNRE BIT(31) /* TX Underrun Error */
#define ATMCI_DMA 0x0050 /* DMA Configuration[2] */
#define ATMCI_DMA_OFFSET(x) ((x) << 0) /* DMA Write Buffer Offset */
#define ATMCI_DMA_CHKSIZE(x) ((x) << 4) /* DMA Channel Read and Write Chunk Size */
#define ATMCI_DMAEN BIT(8) /* DMA Hardware Handshaking Enable */
#define ATMCI_CFG 0x0054 /* Configuration[2] */
#define ATMCI_CFG_FIFOMODE_1DATA BIT(0) /* MCI Internal FIFO control mode */
#define ATMCI_CFG_FERRCTRL_COR BIT(4) /* Flow Error flag reset control mode */
#define ATMCI_CFG_HSMODE BIT(8) /* High Speed Mode */
#define ATMCI_CFG_LSYNC BIT(12) /* Synchronize on the last block */
#define ATMCI_WPMR 0x00e4 /* Write Protection Mode[2] */
#define ATMCI_WP_EN BIT(0) /* WP Enable */
#define ATMCI_WP_KEY (0x4d4349 << 8) /* WP Key */
#define ATMCI_WPSR 0x00e8 /* Write Protection Status[2] */
#define ATMCI_GET_WP_VS(x) ((x) & 0x0f)
#define ATMCI_GET_WP_VSRC(x) (((x) >> 8) & 0xffff)
#define ATMCI_VERSION 0x00FC /* Version */
#define ATMCI_FIFO_APERTURE 0x0200 /* FIFO Aperture[2] */
/* This is not including the FIFO Aperture on MCI2 */
#define ATMCI_REGS_SIZE 0x100
/* Register access macros */
#define atmci_readl(port, reg) \
__raw_readl((port)->regs + reg)
#define atmci_writel(port, reg, value) \
__raw_writel((value), (port)->regs + reg)
#define ATMCI_CMD_TIMEOUT_MS 2000
#define AUTOSUSPEND_DELAY 50
#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 mci_slot_pdata - board-specific per-slot configuration
* @bus_width: Number of data lines wired up the slot
* @detect_pin: GPIO pin wired to the card detect switch
* @wp_pin: GPIO pin wired to the write protect sensor
* @non_removable: The slot is not removable, only detect once
*
* If a given slot is not present on the board, @bus_width should be
* set to 0. The other fields are ignored in this case.
*
* Any pins that aren't available should be set to a negative value.
*
* Note that support for multiple slots is experimental -- some cards
* might get upset if we don't get the clock management exactly right.
* But in most cases, it should work just fine.
*/
struct mci_slot_pdata {
unsigned int bus_width;
struct gpio_desc *detect_pin;
struct gpio_desc *wp_pin;
bool non_removable;
};
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.
* @sg_len: Size of the scatterlist
* @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.
* @buf_phys_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.
* @dma_conf: Configuration for the DMA slave
* @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.
* @bh_work: Work running the request state machine.
* @pending_events: Bitmask of events flagged by the interrupt handler
* to be processed by the work.
* @completed_events: Bitmask of events which the state machine has
* processed.
* @state: Work 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.
* @dev: Device associated with the MMC controller.
* @pdata: Per-slot configuration data.
* @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 sg_len;
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 work_struct bh_work;
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 device *dev;
struct mci_slot_pdata pdata[ATMCI_MAX_NR_SLOTS];
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_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
struct gpio_desc *detect_pin;
struct gpio_desc *wp_pin;
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;
}
DEFINE_SHOW_ATTRIBUTE(atmci_req);
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;
struct device *dev = host->dev;
u32 *buf;
int ret = 0;
buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;
pm_runtime_get_sync(dev);
/*
* 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);
memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
spin_unlock_bh(&host->lock);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
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 ret;
}
DEFINE_SHOW_ATTRIBUTE(atmci_regs);
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;
root = mmc->debugfs_root;
if (!root)
return;
debugfs_create_file("regs", S_IRUSR, root, host, &atmci_regs_fops);
debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
debugfs_create_u32("state", S_IRUSR, root, &host->state);
debugfs_create_xul("pending_events", S_IRUSR, root,
&host->pending_events);
debugfs_create_xul("completed_events", S_IRUSR, root,
&host->completed_events);
}
static const struct of_device_id atmci_dt_ids[] = {
{ .compatible = "atmel,hsmci" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, atmci_dt_ids);
static int atmci_of_init(struct atmel_mci *host)
{
struct device *dev = host->dev;
struct device_node *np = dev->of_node;
struct device_node *cnp;
u32 slot_id;
int err;
if (!np)
return dev_err_probe(dev, -EINVAL, "device node not found\n");
for_each_child_of_node(np, cnp) {
if (of_property_read_u32(cnp, "reg", &slot_id)) {
dev_warn(dev, "reg property is missing for %pOF\n", cnp);
continue;
}
if (slot_id >= ATMCI_MAX_NR_SLOTS) {
dev_warn(dev, "can't have more than %d slots\n",
ATMCI_MAX_NR_SLOTS);
of_node_put(cnp);
break;
}
if (of_property_read_u32(cnp, "bus-width",
&host->pdata[slot_id].bus_width))
host->pdata[slot_id].bus_width = 1;
host->pdata[slot_id].detect_pin =
devm_fwnode_gpiod_get(dev, of_fwnode_handle(cnp),
"cd", GPIOD_IN, "cd-gpios");
err = PTR_ERR_OR_ZERO(host->pdata[slot_id].detect_pin);
if (err) {
if (err != -ENOENT) {
of_node_put(cnp);
return err;
}
host->pdata[slot_id].detect_pin = NULL;
}
host->pdata[slot_id].non_removable =
of_property_read_bool(cnp, "non-removable");
host->pdata[slot_id].wp_pin =
devm_fwnode_gpiod_get(dev, of_fwnode_handle(cnp),
"wp", GPIOD_IN, "wp-gpios");
err = PTR_ERR_OR_ZERO(host->pdata[slot_id].wp_pin);
if (err) {
if (err != -ENOENT) {
of_node_put(cnp);
return err;
}
host->pdata[slot_id].wp_pin = NULL;
}
}
return 0;
}
static inline unsigned int atmci_get_version(struct atmel_mci *host)
{
return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
}
/*
* Fix sconfig's burst size according to atmel MCI. We need to convert them as:
* 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
* With version 0x600, we need to convert them as: 1 -> 0, 2 -> 1, 4 -> 2,
* 8 -> 3, 16 -> 4.
*
* This can be done by finding most significant bit set.
*/
static inline unsigned int atmci_convert_chksize(struct atmel_mci *host,
unsigned int maxburst)
{
unsigned int version = atmci_get_version(host);
unsigned int offset = 2;
if (version >= 0x600)
offset = 1;
if (maxburst > 1)
return fls(maxburst) - offset;
else
return 0;
}
static void atmci_timeout_timer(struct timer_list *t)
{
struct atmel_mci *host = from_timer(host, t, timer);
struct device *dev = host->dev;
dev_dbg(dev, "software timeout\n");
if (host->mrq->cmd->data) {
host->mrq->cmd->data->error = -ETIMEDOUT;
host->data = NULL;
/*
* With some SDIO modules, sometimes DMA transfer hangs. If
* stop_transfer() is not called then the DMA request is not
* removed, following ones are queued and never computed.
*/
if (host->state == STATE_DATA_XFER)
host->stop_transfer(host);
} else {
host->mrq->cmd->error = -ETIMEDOUT;
host->cmd = NULL;
}
host->need_reset = 1;
host->state = STATE_END_REQUEST;
smp_wmb();
queue_work(system_bh_wq, &host->bh_work);
}
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->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)
{
struct device *dev = host->dev;
unsigned int timeout_ms = cmd->busy_timeout ? cmd->busy_timeout :
ATMCI_CMD_TIMEOUT_MS;
WARN_ON(host->cmd);
host->cmd = cmd;
dev_vdbg(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);
mod_timer(&host->timer, jiffies + msecs_to_jiffies(timeout_ms));
}
static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
{
struct device *dev = host->dev;
dev_dbg(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;
struct device *dev = host->dev;
if (data)
dma_unmap_sg(dev, data->sg, data->sg_len, mmc_get_dma_dir(data));
}
/*
* 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)
{
struct device *dev = host->dev;
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);
dev_dbg(dev, "(%s) set pending xfer complete\n", __func__);
atmci_set_pending(host, EVENT_XFER_COMPLETE);
queue_work(system_bh_wq, &host->bh_work);
}
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,
mmc_get_dma_dir(data));
}
/*
* This function is called by the DMA driver from bh context.
*/
static void atmci_dma_complete(void *arg)
{
struct atmel_mci *host = arg;
struct mmc_data *data = host->data;
struct device *dev = host->dev;
dev_vdbg(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(dev, "(%s) set pending xfer complete\n", __func__);
atmci_set_pending(host, EVENT_XFER_COMPLETE);
queue_work(system_bh_wq, &host->bh_work);
/*
* 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
* bh work 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->sg_len = data->sg_len;
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)
{
struct device *dev = host->dev;
u32 iflags, tmp;
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)
iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
else
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;
dma_map_sg(dev, data->sg, data->sg_len, mmc_get_dma_dir(data));
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, data->flags & MMC_DATA_READ ?
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_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 */
if (!host->dma.chan)
return -ENODEV;
chan = host->dma.chan;
host->data_chan = chan;
if (data->flags & MMC_DATA_READ) {
host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
maxburst = atmci_convert_chksize(host,
host->dma_conf.src_maxburst);
} else {
host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
maxburst = atmci_convert_chksize(host,
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, mmc_get_dma_dir(data));
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,
mmc_get_dma_dir(data));
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)
{
struct device *dev = host->dev;
dev_dbg(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) occurred.
*/
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;
struct device *dev = host->dev;
if (chan) {
dmaengine_terminate_all(chan);
atmci_dma_cleanup(host);
} else {
/* Data transfer was stopped by the interrupt handler */
dev_dbg(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 device *dev = host->dev;
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(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);
/*
* DMA transfer should be started before sending the command to avoid
* unexpected errors especially for read operations in SDIO mode.
* Unfortunately, in PDC mode, command has to be sent before starting
* the transfer.
*/
if (host->submit_data != &atmci_submit_data_dma)
atmci_send_command(host, cmd, cmdflags);
if (data)
host->submit_data(host, data);
if (host->submit_data == &atmci_submit_data_dma)
atmci_send_command(host, cmd, cmdflags);
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;
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);
}
static void atmci_queue_request(struct atmel_mci *host,
struct atmel_mci_slot *slot, struct mmc_request *mrq)
{
struct device *dev = host->dev;
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(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 device *dev = host->dev;
struct mmc_data *data;
WARN_ON(slot->mrq);
dev_dbg(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;
case MMC_BUS_WIDTH_8:
slot->sdc_reg |= ATMCI_SDCBUS_8BIT;
break;
}
if (ios->clock) {
unsigned int clock_min = ~0U;
int clkdiv;
spin_lock_bh(&host->lock);
if (!host->mode_reg) {
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 < 0) {
dev_warn(&mmc->class_dev,
"clock %u too fast; using %lu\n",
clock_min, host->bus_hz / 2);
clkdiv = 0;
} else 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);
}
host->mode_reg = 0;
}
spin_unlock_bh(&host->lock);
}
switch (ios->power_mode) {
case MMC_POWER_OFF:
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
break;
case MMC_POWER_UP:
set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
break;
default:
break;
}
}
static int atmci_get_ro(struct mmc_host *mmc)
{
int read_only = -ENOSYS;
struct atmel_mci_slot *slot = mmc_priv(mmc);
if (slot->wp_pin) {
read_only = gpiod_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 (slot->detect_pin) {
present = gpiod_get_value_cansleep(slot->detect_pin);
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;
struct device *dev = host->dev;
WARN_ON(host->cmd || host->data);
del_timer(&host->timer);
/*
* 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(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(dev, "list empty\n");
host->state = STATE_IDLE;
}
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(struct timer_list *t)
{
struct atmel_mci_slot *slot = from_timer(slot, t, detect_timer);
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(gpiod_to_irq(slot->detect_pin));
present = gpiod_get_value_cansleep(slot->detect_pin);
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_work_func(struct work_struct *t)
{
struct atmel_mci *host = from_work(host, t, bh_work);
struct mmc_request *mrq = host->mrq;
struct mmc_data *data = host->data;
struct device *dev = host->dev;
enum atmel_mci_state state = host->state;
enum atmel_mci_state prev_state;
u32 status;
spin_lock(&host->lock);
state = host->state;
dev_vdbg(dev, "bh_work: 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(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(dev, "FSM: cmd ready?\n");
if (!atmci_test_and_clear_pending(host,
EVENT_CMD_RDY))
break;
dev_dbg(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(dev, "command with data transfer\n");
/*
* 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(dev, "command response need waiting notbusy\n");
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(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(dev, "FSM: xfer complete?\n");
if (!atmci_test_and_clear_pending(host,
EVENT_XFER_COMPLETE))
break;
dev_dbg(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_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(dev, "FSM: not busy?\n");
if (!atmci_test_and_clear_pending(host,
EVENT_NOTBUSY))
break;
dev_dbg(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_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(dev, "FSM: cmd ready?\n");
if (!atmci_test_and_clear_pending(host,
EVENT_CMD_RDY))
break;
dev_dbg(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 (data) {
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);
goto unlock; /* atmci_request_end() sets host->state */
break;
}
} while (state != prev_state);
host->state = state;
unlock:
spin_unlock(&host->lock);
}
static void atmci_read_data_pio(struct atmel_mci *host)
{
struct scatterlist *sg = host->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)) {
sg_pcopy_from_buffer(sg, 1, &value, sizeof(u32), offset);
offset += 4;
nbytes += 4;
if (offset == sg->length) {
flush_dcache_page(sg_page(sg));
host->sg = sg = sg_next(sg);
host->sg_len--;
if (!sg || !host->sg_len)
goto done;
offset = 0;
}
} else {
unsigned int remaining = sg->length - offset;
sg_pcopy_from_buffer(sg, 1, &value, remaining, offset);
nbytes += remaining;
flush_dcache_page(sg_page(sg));
host->sg = sg = sg_next(sg);
host->sg_len--;
if (!sg || !host->sg_len)
goto done;
offset = 4 - remaining;
sg_pcopy_from_buffer(sg, 1, (u8 *)&value + remaining,
offset, 0);
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;
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)) {
sg_pcopy_to_buffer(sg, 1, &value, sizeof(u32), offset);
atmci_writel(host, ATMCI_TDR, value);
offset += 4;
nbytes += 4;
if (offset == sg->length) {
host->sg = sg = sg_next(sg);
host->sg_len--;
if (!sg || !host->sg_len)
goto done;
offset = 0;
}
} else {
unsigned int remaining = sg->length - offset;
value = 0;
sg_pcopy_to_buffer(sg, 1, &value, remaining, offset);
nbytes += remaining;
host->sg = sg = sg_next(sg);
host->sg_len--;
if (!sg || !host->sg_len) {
atmci_writel(host, ATMCI_TDR, value);
goto done;
}
offset = 4 - remaining;
sg_pcopy_to_buffer(sg, 1, (u8 *)&value + remaining,
offset, 0);
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;
struct device *dev = host->dev;
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(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(dev, "set pending data error\n");
smp_wmb();
atmci_set_pending(host, EVENT_DATA_ERROR);
queue_work(system_bh_wq, &host->bh_work);
}
if (pending & ATMCI_TXBUFE) {
dev_dbg(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(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(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(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(dev, "IRQ: blke\n");
atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
smp_wmb();
dev_dbg(dev, "set pending notbusy\n");
atmci_set_pending(host, EVENT_NOTBUSY);
queue_work(system_bh_wq, &host->bh_work);
}
if (pending & ATMCI_NOTBUSY) {
dev_dbg(dev, "IRQ: not_busy\n");
atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
smp_wmb();
dev_dbg(dev, "set pending notbusy\n");
atmci_set_pending(host, EVENT_NOTBUSY);
queue_work(system_bh_wq, &host->bh_work);
}
if (pending & ATMCI_RXRDY)
atmci_read_data_pio(host);
if (pending & ATMCI_TXRDY)
atmci_write_data_pio(host);
if (pending & ATMCI_CMDRDY) {
dev_dbg(dev, "IRQ: cmd ready\n");
atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
host->cmd_status = status;
smp_wmb();
dev_dbg(dev, "set pending cmd rdy\n");
atmci_set_pending(host, EVENT_CMD_RDY);
queue_work(system_bh_wq, &host->bh_work);
}
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 atmci_init_slot(struct atmel_mci *host,
struct mci_slot_pdata *slot_data, unsigned int id,
u32 sdc_reg, u32 sdio_irq)
{
struct device *dev = host->dev;
struct mmc_host *mmc;
struct atmel_mci_slot *slot;
int ret;
mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), 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->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, desc_to_gpio(slot_data->detect_pin),
!gpiod_is_active_low(slot_data->detect_pin) ? "true" : "false",
desc_to_gpio(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 (slot_data->bus_width >= 8)
mmc->caps |= MMC_CAP_8_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 (slot->detect_pin) {
if (!gpiod_get_value_cansleep(slot->detect_pin))
clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
} else {
dev_dbg(&mmc->class_dev, "no detect pin available\n");
}
if (!slot->detect_pin) {
if (slot_data->non_removable)
mmc->caps |= MMC_CAP_NONREMOVABLE;
else
mmc->caps |= MMC_CAP_NEEDS_POLL;
}
if (!slot->wp_pin)
dev_dbg(&mmc->class_dev, "no WP pin available\n");
host->slot[id] = slot;
mmc_regulator_get_supply(mmc);
ret = mmc_add_host(mmc);
if (ret) {
mmc_free_host(mmc);
return ret;
}
if (slot->detect_pin) {
timer_setup(&slot->detect_timer, atmci_detect_change, 0);
ret = request_irq(gpiod_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",
gpiod_to_irq(slot->detect_pin));
slot->detect_pin = NULL;
}
}
atmci_init_debugfs(slot);
return 0;
}
static void 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 (slot->detect_pin) {
free_irq(gpiod_to_irq(slot->detect_pin), slot);
del_timer_sync(&slot->detect_timer);
}
slot->host->slot[id] = NULL;
mmc_free_host(slot->mmc);
}
static int atmci_configure_dma(struct atmel_mci *host)
{
struct device *dev = host->dev;
host->dma.chan = dma_request_chan(dev, "rxtx");
if (IS_ERR(host->dma.chan))
return PTR_ERR(host->dma.chan);
dev_info(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 0;
}
/*
* 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 atmci_get_cap(struct atmel_mci *host)
{
struct device *dev = host->dev;
unsigned int version;
version = atmci_get_version(host);
dev_info(dev, "version: 0x%x\n", version);
host->caps.has_dma_conf_reg = false;
host->caps.has_pdc = true;
host->caps.has_cfg_reg = false;
host->caps.has_cstor_reg = false;
host->caps.has_highspeed = false;
host->caps.has_rwproof = false;
host->caps.has_odd_clk_div = false;
host->caps.has_bad_data_ordering = true;
host->caps.need_reset_after_xfer = true;
host->caps.need_blksz_mul_4 = true;
host->caps.need_notbusy_for_read_ops = false;
/* keep only major version number */
switch (version & 0xf00) {
case 0x600:
case 0x500:
host->caps.has_odd_clk_div = true;
fallthrough;
case 0x400:
case 0x300:
host->caps.has_dma_conf_reg = true;
host->caps.has_pdc = false;
host->caps.has_cfg_reg = true;
host->caps.has_cstor_reg = true;
host->caps.has_highspeed = true;
fallthrough;
case 0x200:
host->caps.has_rwproof = true;
host->caps.need_blksz_mul_4 = false;
host->caps.need_notbusy_for_read_ops = true;
fallthrough;
case 0x100:
host->caps.has_bad_data_ordering = false;
host->caps.need_reset_after_xfer = false;
fallthrough;
case 0x0:
break;
default:
host->caps.has_pdc = false;
dev_warn(dev, "Unmanaged mci version, set minimum capabilities\n");
break;
}
}
static int atmci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct atmel_mci *host;
struct resource *regs;
unsigned int nr_slots;
int irq;
int ret, i;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs)
return -ENXIO;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
host->dev = dev;
spin_lock_init(&host->lock);
INIT_LIST_HEAD(&host->queue);
ret = atmci_of_init(host);
if (ret)
return dev_err_probe(dev, ret, "Slot information not available\n");
host->mck = devm_clk_get(dev, "mci_clk");
if (IS_ERR(host->mck))
return PTR_ERR(host->mck);
host->regs = devm_ioremap(dev, regs->start, resource_size(regs));
if (!host->regs)
return -ENOMEM;
ret = clk_prepare_enable(host->mck);
if (ret)
return ret;
atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
host->bus_hz = clk_get_rate(host->mck);
host->mapbase = regs->start;
INIT_WORK(&host->bh_work, atmci_work_func);
ret = request_irq(irq, atmci_interrupt, 0, dev_name(dev), host);
if (ret) {
clk_disable_unprepare(host->mck);
return ret;
}
/* Get MCI capabilities and set operations according to it */
atmci_get_cap(host);
ret = atmci_configure_dma(host);
if (ret == -EPROBE_DEFER)
goto err_dma_probe_defer;
if (ret == 0) {
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(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(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);
timer_setup(&host->timer, atmci_timeout_timer, 0);
pm_runtime_get_noresume(dev);
pm_runtime_set_active(dev);
pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(dev);
pm_runtime_enable(dev);
/* We need at least one slot to succeed */
nr_slots = 0;
ret = -ENODEV;
if (host->pdata[0].bus_width) {
ret = atmci_init_slot(host, &host->pdata[0],
0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
if (!ret) {
nr_slots++;
host->buf_size = host->slot[0]->mmc->max_req_size;
}
}
if (host->pdata[1].bus_width) {
ret = atmci_init_slot(host, &host->pdata[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_probe(dev, ret, "init failed: no slot defined\n");
goto err_init_slot;
}
if (!host->caps.has_rwproof) {
host->buffer = dma_alloc_coherent(dev, host->buf_size,
&host->buf_phys_addr,
GFP_KERNEL);
if (!host->buffer) {
ret = dev_err_probe(dev, -ENOMEM, "buffer allocation failed\n");
goto err_dma_alloc;
}
}
dev_info(dev, "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
host->mapbase, irq, nr_slots);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return 0;
err_dma_alloc:
for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
if (host->slot[i])
atmci_cleanup_slot(host->slot[i], i);
}
err_init_slot:
clk_disable_unprepare(host->mck);
pm_runtime_disable(dev);
pm_runtime_put_noidle(dev);
del_timer_sync(&host->timer);
if (!IS_ERR(host->dma.chan))
dma_release_channel(host->dma.chan);
err_dma_probe_defer:
free_irq(irq, host);
return ret;
}
static void atmci_remove(struct platform_device *pdev)
{
struct atmel_mci *host = platform_get_drvdata(pdev);
struct device *dev = &pdev->dev;
unsigned int i;
pm_runtime_get_sync(dev);
if (host->buffer)
dma_free_coherent(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);
}
atmci_writel(host, ATMCI_IDR, ~0UL);
atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
atmci_readl(host, ATMCI_SR);
del_timer_sync(&host->timer);
if (!IS_ERR(host->dma.chan))
dma_release_channel(host->dma.chan);
free_irq(platform_get_irq(pdev, 0), host);
clk_disable_unprepare(host->mck);
pm_runtime_disable(dev);
pm_runtime_put_noidle(dev);
}
#ifdef CONFIG_PM
static int atmci_runtime_suspend(struct device *dev)
{
struct atmel_mci *host = dev_get_drvdata(dev);
clk_disable_unprepare(host->mck);
pinctrl_pm_select_sleep_state(dev);
return 0;
}
static int atmci_runtime_resume(struct device *dev)
{
struct atmel_mci *host = dev_get_drvdata(dev);
pinctrl_select_default_state(dev);
return clk_prepare_enable(host->mck);
}
#endif
static const struct dev_pm_ops atmci_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(atmci_runtime_suspend, atmci_runtime_resume, NULL)
};
static struct platform_driver atmci_driver = {
.probe = atmci_probe,
.remove_new = atmci_remove,
.driver = {
.name = "atmel_mci",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = atmci_dt_ids,
.pm = &atmci_dev_pm_ops,
},
};
module_platform_driver(atmci_driver);
MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
MODULE_LICENSE("GPL v2");