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Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/tifm_sd.c259
1 files changed, 137 insertions, 122 deletions
diff --git a/drivers/mmc/tifm_sd.c b/drivers/mmc/tifm_sd.c
index 52499548abe8..103060f490a6 100644
--- a/drivers/mmc/tifm_sd.c
+++ b/drivers/mmc/tifm_sd.c
@@ -70,19 +70,14 @@ module_param(fixed_timeout, bool, 0644);
#define TIFM_MMCSD_CMD_AC 0x2000
#define TIFM_MMCSD_CMD_ADTC 0x3000
-typedef enum {
- IDLE = 0,
- CMD, /* main command ended */
- BRS, /* block transfer finished */
- SCMD, /* stop command ended */
- CARD, /* card left busy state */
- FIFO, /* FIFO operation completed (uncertain) */
- READY
-} card_state_t;
-
enum {
- FIFO_RDY = 0x0001, /* hardware dependent value */
- CARD_BUSY = 0x0010
+ CMD_READY = 0x0001,
+ FIFO_READY = 0x0002,
+ BRS_READY = 0x0004,
+ SCMD_ACTIVE = 0x0008,
+ SCMD_READY = 0x0010,
+ CARD_BUSY = 0x0020,
+ DATA_CARRY = 0x0040
};
struct tifm_sd {
@@ -92,7 +87,7 @@ struct tifm_sd {
open_drain:1,
no_dma:1;
unsigned short cmd_flags;
- card_state_t state;
+
unsigned int clk_freq;
unsigned int clk_div;
unsigned long timeout_jiffies;
@@ -234,87 +229,76 @@ static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
| readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
}
-static void tifm_sd_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
- unsigned int host_status)
+static void tifm_sd_check_status(struct tifm_sd *host)
{
+ struct tifm_dev *sock = host->dev;
struct mmc_command *cmd = host->req->cmd;
-change_state:
- switch (host->state) {
- case IDLE:
+ if (cmd->error != MMC_ERR_NONE)
+ goto finish_request;
+
+ if (!(host->cmd_flags & CMD_READY))
return;
- case CMD:
- if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
- tifm_sd_fetch_resp(cmd, sock);
- if (cmd->data) {
- host->state = BRS;
- } else {
- host->state = READY;
- }
- goto change_state;
- }
- break;
- case BRS:
- if (tifm_sd_transfer_data(sock, host, host_status)) {
- if (cmd->data->flags & MMC_DATA_WRITE) {
- host->state = CARD;
- } else {
- if (host->no_dma) {
- if (host->req->stop) {
- tifm_sd_exec(host, host->req->stop);
- host->state = SCMD;
- } else {
- host->state = READY;
- }
- } else {
- host->state = FIFO;
- }
- }
- goto change_state;
- }
- break;
- case SCMD:
- if (host_status & TIFM_MMCSD_EOC) {
- tifm_sd_fetch_resp(host->req->stop, sock);
- host->state = READY;
- goto change_state;
+
+ if (cmd->data) {
+ if (cmd->data->error != MMC_ERR_NONE) {
+ if ((host->cmd_flags & SCMD_ACTIVE)
+ && !(host->cmd_flags & SCMD_READY))
+ return;
+
+ goto finish_request;
}
- break;
- case CARD:
- dev_dbg(&sock->dev, "waiting for CARD, have %zd blocks\n",
- host->written_blocks);
- if (!(host->cmd_flags & CARD_BUSY)
- && (host->written_blocks == cmd->data->blocks)) {
- if (host->no_dma) {
- if (host->req->stop) {
+
+ if (!(host->cmd_flags & BRS_READY))
+ return;
+
+ if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
+ return;
+
+ if (cmd->data->flags & MMC_DATA_WRITE) {
+ if (host->req->stop) {
+ if (!(host->cmd_flags & SCMD_ACTIVE)) {
+ host->cmd_flags |= SCMD_ACTIVE;
+ writel(TIFM_MMCSD_EOFB
+ | readl(sock->addr
+ + SOCK_MMCSD_INT_ENABLE),
+ sock->addr
+ + SOCK_MMCSD_INT_ENABLE);
tifm_sd_exec(host, host->req->stop);
- host->state = SCMD;
+ return;
} else {
- host->state = READY;
+ if (!(host->cmd_flags & SCMD_READY)
+ || (host->cmd_flags & CARD_BUSY))
+ return;
+ writel((~TIFM_MMCSD_EOFB)
+ & readl(sock->addr
+ + SOCK_MMCSD_INT_ENABLE),
+ sock->addr
+ + SOCK_MMCSD_INT_ENABLE);
}
} else {
- host->state = FIFO;
+ if (host->cmd_flags & CARD_BUSY)
+ return;
+ writel((~TIFM_MMCSD_EOFB)
+ & readl(sock->addr
+ + SOCK_MMCSD_INT_ENABLE),
+ sock->addr + SOCK_MMCSD_INT_ENABLE);
}
- goto change_state;
- }
- break;
- case FIFO:
- if (host->cmd_flags & FIFO_RDY) {
- host->cmd_flags &= ~FIFO_RDY;
+ } else {
if (host->req->stop) {
- tifm_sd_exec(host, host->req->stop);
- host->state = SCMD;
- } else {
- host->state = READY;
+ if (!(host->cmd_flags & SCMD_ACTIVE)) {
+ host->cmd_flags |= SCMD_ACTIVE;
+ tifm_sd_exec(host, host->req->stop);
+ return;
+ } else {
+ if (!(host->cmd_flags & SCMD_READY))
+ return;
+ }
}
- goto change_state;
}
- break;
- case READY:
- tasklet_schedule(&host->finish_tasklet);
- return;
}
-
+finish_request:
+ tasklet_schedule(&host->finish_tasklet);
}
/* Called from interrupt handler */
@@ -322,21 +306,25 @@ static void tifm_sd_data_event(struct tifm_dev *sock)
{
struct tifm_sd *host;
unsigned int fifo_status = 0;
+ struct mmc_data *r_data = NULL;
spin_lock(&sock->lock);
host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
-
fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
- writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
+ dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
+ fifo_status, host->cmd_flags);
- host->cmd_flags |= fifo_status & FIFO_RDY;
+ if (host->req) {
+ r_data = host->req->cmd->data;
- if (host->req)
- tifm_sd_process_cmd(sock, host, 0);
+ if (r_data && (fifo_status & TIFM_FIFO_READY)) {
+ host->cmd_flags |= FIFO_READY;
+ tifm_sd_check_status(host);
+ }
+ }
- dev_dbg(&sock->dev, "fifo_status %x\n", fifo_status);
+ writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
spin_unlock(&sock->lock);
-
}
/* Called from interrupt handler */
@@ -344,60 +332,88 @@ static void tifm_sd_card_event(struct tifm_dev *sock)
{
struct tifm_sd *host;
unsigned int host_status = 0;
- int error_code = 0;
+ int cmd_error = MMC_ERR_NONE;
+ struct mmc_command *cmd = NULL;
+ unsigned long flags;
spin_lock(&sock->lock);
host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
+ host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
+ dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
+ host_status, host->cmd_flags);
-
- host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
- writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
-
- if (!host->req)
- goto done;
+ if (host->req) {
+ cmd = host->req->cmd;
if (host_status & TIFM_MMCSD_ERRMASK) {
- if (host_status & (TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
- error_code = MMC_ERR_TIMEOUT;
- else if (host_status
- & (TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
- error_code = MMC_ERR_BADCRC;
+ writel(host_status & TIFM_MMCSD_ERRMASK,
+ sock->addr + SOCK_MMCSD_STATUS);
+ if (host_status & TIFM_MMCSD_CTO)
+ cmd_error = MMC_ERR_TIMEOUT;
+ else if (host_status & TIFM_MMCSD_CCRC)
+ cmd_error = MMC_ERR_BADCRC;
+
+ if (cmd->data) {
+ if (host_status & TIFM_MMCSD_DTO)
+ cmd->data->error = MMC_ERR_TIMEOUT;
+ else if (host_status & TIFM_MMCSD_DCRC)
+ cmd->data->error = MMC_ERR_BADCRC;
+ }
writel(TIFM_FIFO_INT_SETALL,
sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
if (host->req->stop) {
- if (host->state == SCMD) {
- host->req->stop->error = error_code;
- } else if (host->state == BRS
- || host->state == CARD
- || host->state == FIFO) {
- host->req->cmd->error = error_code;
+ if (host->cmd_flags & SCMD_ACTIVE) {
+ host->req->stop->error = cmd_error;
+ host->cmd_flags |= SCMD_READY;
+ } else {
+ cmd->error = cmd_error;
+ host->cmd_flags |= SCMD_ACTIVE;
tifm_sd_exec(host, host->req->stop);
- host->state = SCMD;
goto done;
- } else {
- host->req->cmd->error = error_code;
}
- } else {
- host->req->cmd->error = error_code;
+ } else
+ cmd->error = cmd_error;
+ } else {
+ if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
+ if (!(host->cmd_flags & CMD_READY)) {
+ host->cmd_flags |= CMD_READY;
+ tifm_sd_fetch_resp(cmd, sock);
+ } else if (host->cmd_flags & SCMD_ACTIVE) {
+ host->cmd_flags |= SCMD_READY;
+ tifm_sd_fetch_resp(host->req->stop,
+ sock);
+ }
}
- host->state = READY;
+ if (host_status & TIFM_MMCSD_BRS)
+ host->cmd_flags |= BRS_READY;
}
- if (host_status & TIFM_MMCSD_CB)
- host->cmd_flags |= CARD_BUSY;
- if ((host_status & TIFM_MMCSD_EOFB)
- && (host->cmd_flags & CARD_BUSY)) {
- host->written_blocks++;
- host->cmd_flags &= ~CARD_BUSY;
+ if (host->no_dma && cmd->data) {
+ if (host_status & TIFM_MMCSD_AE)
+ writel(host_status & TIFM_MMCSD_AE,
+ sock->addr + SOCK_MMCSD_STATUS);
+
+ if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
+ | TIFM_MMCSD_BRS)) {
+ local_irq_save(flags);
+ tifm_sd_transfer_data(sock, host, host_status);
+ local_irq_restore(flags);
+ host_status &= ~TIFM_MMCSD_AE;
+ }
}
- if (host->req)
- tifm_sd_process_cmd(sock, host, host_status);
+ if (host_status & TIFM_MMCSD_EOFB)
+ host->cmd_flags &= ~CARD_BUSY;
+ else if (host_status & TIFM_MMCSD_CB)
+ host->cmd_flags |= CARD_BUSY;
+
+ tifm_sd_check_status(host);
+ }
done:
- dev_dbg(&sock->dev, "host_status %x\n", host_status);
+ writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
spin_unlock(&sock->lock);
}
@@ -522,7 +538,7 @@ static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
host->req = mrq;
mod_timer(&host->timer, jiffies + host->timeout_jiffies);
- host->state = CMD;
+ host->cmd_flags = 0;
writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
sock->addr + SOCK_CONTROL);
tifm_sd_exec(host, mrq->cmd);
@@ -553,7 +569,6 @@ static void tifm_sd_end_cmd(unsigned long data)
del_timer(&host->timer);
mrq = host->req;
host->req = NULL;
- host->state = IDLE;
if (!mrq) {
printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-27 00:14:57 +0300