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tifm_sd: replace command completion state machine with full checking
State machine used to to track mmc command state was found to be fragile and unreliable, making many cards unusable. The safer solution is to perform all needed checks at every card event. Signed-off-by: Alex Dubov <oakad@yahoo.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Alex Dubov
Pierre Ossman
parent
dfef26d9aa
commit
72dc9d9619
@ -70,19 +70,14 @@ module_param(fixed_timeout, bool, 0644);
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#define TIFM_MMCSD_CMD_AC 0x2000
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#define TIFM_MMCSD_CMD_ADTC 0x3000
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typedef enum {
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IDLE = 0,
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CMD, /* main command ended */
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BRS, /* block transfer finished */
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SCMD, /* stop command ended */
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CARD, /* card left busy state */
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FIFO, /* FIFO operation completed (uncertain) */
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READY
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} card_state_t;
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enum {
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FIFO_RDY = 0x0001, /* hardware dependent value */
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CARD_BUSY = 0x0010
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CMD_READY = 0x0001,
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FIFO_READY = 0x0002,
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BRS_READY = 0x0004,
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SCMD_ACTIVE = 0x0008,
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SCMD_READY = 0x0010,
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CARD_BUSY = 0x0020,
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DATA_CARRY = 0x0040
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};
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struct tifm_sd {
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@ -92,7 +87,7 @@ struct tifm_sd {
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open_drain:1,
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no_dma:1;
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unsigned short cmd_flags;
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card_state_t state;
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unsigned int clk_freq;
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unsigned int clk_div;
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unsigned long timeout_jiffies;
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@ -234,87 +229,76 @@ static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock)
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| readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00);
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}
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static void tifm_sd_process_cmd(struct tifm_dev *sock, struct tifm_sd *host,
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unsigned int host_status)
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static void tifm_sd_check_status(struct tifm_sd *host)
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{
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struct tifm_dev *sock = host->dev;
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struct mmc_command *cmd = host->req->cmd;
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change_state:
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switch (host->state) {
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case IDLE:
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if (cmd->error != MMC_ERR_NONE)
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goto finish_request;
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if (!(host->cmd_flags & CMD_READY))
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return;
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case CMD:
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if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
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tifm_sd_fetch_resp(cmd, sock);
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if (cmd->data) {
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host->state = BRS;
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} else {
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host->state = READY;
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}
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goto change_state;
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}
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break;
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case BRS:
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if (tifm_sd_transfer_data(sock, host, host_status)) {
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if (cmd->data->flags & MMC_DATA_WRITE) {
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host->state = CARD;
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} else {
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if (host->no_dma) {
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if (host->req->stop) {
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tifm_sd_exec(host, host->req->stop);
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host->state = SCMD;
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} else {
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host->state = READY;
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}
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} else {
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host->state = FIFO;
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}
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}
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goto change_state;
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}
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break;
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case SCMD:
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if (host_status & TIFM_MMCSD_EOC) {
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tifm_sd_fetch_resp(host->req->stop, sock);
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host->state = READY;
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goto change_state;
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}
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break;
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case CARD:
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dev_dbg(&sock->dev, "waiting for CARD, have %zd blocks\n",
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host->written_blocks);
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if (!(host->cmd_flags & CARD_BUSY)
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&& (host->written_blocks == cmd->data->blocks)) {
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if (host->no_dma) {
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if (host->req->stop) {
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tifm_sd_exec(host, host->req->stop);
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host->state = SCMD;
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} else {
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host->state = READY;
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}
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} else {
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host->state = FIFO;
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}
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goto change_state;
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}
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break;
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case FIFO:
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if (host->cmd_flags & FIFO_RDY) {
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host->cmd_flags &= ~FIFO_RDY;
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if (host->req->stop) {
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tifm_sd_exec(host, host->req->stop);
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host->state = SCMD;
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} else {
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host->state = READY;
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}
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goto change_state;
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}
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break;
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case READY:
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tasklet_schedule(&host->finish_tasklet);
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if (cmd->data->error != MMC_ERR_NONE) {
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if ((host->cmd_flags & SCMD_ACTIVE)
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&& !(host->cmd_flags & SCMD_READY))
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return;
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goto finish_request;
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}
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if (!(host->cmd_flags & BRS_READY))
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return;
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if (!(host->no_dma || (host->cmd_flags & FIFO_READY)))
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return;
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if (cmd->data->flags & MMC_DATA_WRITE) {
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if (host->req->stop) {
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if (!(host->cmd_flags & SCMD_ACTIVE)) {
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host->cmd_flags |= SCMD_ACTIVE;
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writel(TIFM_MMCSD_EOFB
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| readl(sock->addr
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+ SOCK_MMCSD_INT_ENABLE),
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sock->addr
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+ SOCK_MMCSD_INT_ENABLE);
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tifm_sd_exec(host, host->req->stop);
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return;
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} else {
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if (!(host->cmd_flags & SCMD_READY)
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|| (host->cmd_flags & CARD_BUSY))
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return;
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writel((~TIFM_MMCSD_EOFB)
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& readl(sock->addr
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+ SOCK_MMCSD_INT_ENABLE),
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sock->addr
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+ SOCK_MMCSD_INT_ENABLE);
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}
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} else {
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if (host->cmd_flags & CARD_BUSY)
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return;
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writel((~TIFM_MMCSD_EOFB)
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& readl(sock->addr
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+ SOCK_MMCSD_INT_ENABLE),
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sock->addr + SOCK_MMCSD_INT_ENABLE);
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}
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} else {
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if (host->req->stop) {
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if (!(host->cmd_flags & SCMD_ACTIVE)) {
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host->cmd_flags |= SCMD_ACTIVE;
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tifm_sd_exec(host, host->req->stop);
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return;
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} else {
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if (!(host->cmd_flags & SCMD_READY))
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return;
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}
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}
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}
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}
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finish_request:
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tasklet_schedule(&host->finish_tasklet);
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}
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/* Called from interrupt handler */
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@ -322,21 +306,25 @@ static void tifm_sd_data_event(struct tifm_dev *sock)
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{
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struct tifm_sd *host;
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unsigned int fifo_status = 0;
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struct mmc_data *r_data = NULL;
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spin_lock(&sock->lock);
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host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
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fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS);
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dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n",
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fifo_status, host->cmd_flags);
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if (host->req) {
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r_data = host->req->cmd->data;
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if (r_data && (fifo_status & TIFM_FIFO_READY)) {
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host->cmd_flags |= FIFO_READY;
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tifm_sd_check_status(host);
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}
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}
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writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS);
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host->cmd_flags |= fifo_status & FIFO_RDY;
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if (host->req)
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tifm_sd_process_cmd(sock, host, 0);
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dev_dbg(&sock->dev, "fifo_status %x\n", fifo_status);
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spin_unlock(&sock->lock);
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}
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/* Called from interrupt handler */
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@ -344,60 +332,88 @@ static void tifm_sd_card_event(struct tifm_dev *sock)
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{
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struct tifm_sd *host;
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unsigned int host_status = 0;
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int error_code = 0;
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int cmd_error = MMC_ERR_NONE;
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struct mmc_command *cmd = NULL;
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unsigned long flags;
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spin_lock(&sock->lock);
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host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock));
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host_status = readl(sock->addr + SOCK_MMCSD_STATUS);
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writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
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dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n",
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host_status, host->cmd_flags);
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if (!host->req)
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goto done;
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if (host->req) {
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cmd = host->req->cmd;
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if (host_status & TIFM_MMCSD_ERRMASK) {
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if (host_status & (TIFM_MMCSD_CTO | TIFM_MMCSD_DTO))
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error_code = MMC_ERR_TIMEOUT;
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else if (host_status
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& (TIFM_MMCSD_CCRC | TIFM_MMCSD_DCRC))
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error_code = MMC_ERR_BADCRC;
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writel(host_status & TIFM_MMCSD_ERRMASK,
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sock->addr + SOCK_MMCSD_STATUS);
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if (host_status & TIFM_MMCSD_CTO)
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cmd_error = MMC_ERR_TIMEOUT;
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else if (host_status & TIFM_MMCSD_CCRC)
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cmd_error = MMC_ERR_BADCRC;
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if (cmd->data) {
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if (host_status & TIFM_MMCSD_DTO)
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cmd->data->error = MMC_ERR_TIMEOUT;
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else if (host_status & TIFM_MMCSD_DCRC)
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cmd->data->error = MMC_ERR_BADCRC;
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}
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writel(TIFM_FIFO_INT_SETALL,
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sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
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writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL);
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if (host->req->stop) {
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if (host->state == SCMD) {
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host->req->stop->error = error_code;
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} else if (host->state == BRS
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|| host->state == CARD
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|| host->state == FIFO) {
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host->req->cmd->error = error_code;
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if (host->cmd_flags & SCMD_ACTIVE) {
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host->req->stop->error = cmd_error;
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host->cmd_flags |= SCMD_READY;
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} else {
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cmd->error = cmd_error;
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host->cmd_flags |= SCMD_ACTIVE;
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tifm_sd_exec(host, host->req->stop);
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host->state = SCMD;
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goto done;
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} else {
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host->req->cmd->error = error_code;
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}
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} else
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cmd->error = cmd_error;
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} else {
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host->req->cmd->error = error_code;
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if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) {
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if (!(host->cmd_flags & CMD_READY)) {
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host->cmd_flags |= CMD_READY;
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tifm_sd_fetch_resp(cmd, sock);
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} else if (host->cmd_flags & SCMD_ACTIVE) {
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host->cmd_flags |= SCMD_READY;
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tifm_sd_fetch_resp(host->req->stop,
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sock);
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}
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host->state = READY;
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}
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if (host_status & TIFM_MMCSD_BRS)
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host->cmd_flags |= BRS_READY;
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}
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if (host_status & TIFM_MMCSD_CB)
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host->cmd_flags |= CARD_BUSY;
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if ((host_status & TIFM_MMCSD_EOFB)
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&& (host->cmd_flags & CARD_BUSY)) {
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host->written_blocks++;
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if (host->no_dma && cmd->data) {
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if (host_status & TIFM_MMCSD_AE)
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writel(host_status & TIFM_MMCSD_AE,
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sock->addr + SOCK_MMCSD_STATUS);
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if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF
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| TIFM_MMCSD_BRS)) {
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local_irq_save(flags);
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tifm_sd_transfer_data(sock, host, host_status);
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local_irq_restore(flags);
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host_status &= ~TIFM_MMCSD_AE;
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}
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}
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if (host_status & TIFM_MMCSD_EOFB)
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host->cmd_flags &= ~CARD_BUSY;
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}
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else if (host_status & TIFM_MMCSD_CB)
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host->cmd_flags |= CARD_BUSY;
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if (host->req)
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tifm_sd_process_cmd(sock, host, host_status);
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tifm_sd_check_status(host);
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}
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done:
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dev_dbg(&sock->dev, "host_status %x\n", host_status);
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writel(host_status, sock->addr + SOCK_MMCSD_STATUS);
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spin_unlock(&sock->lock);
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}
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@ -522,7 +538,7 @@ static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq)
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host->req = mrq;
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mod_timer(&host->timer, jiffies + host->timeout_jiffies);
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host->state = CMD;
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host->cmd_flags = 0;
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writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL),
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sock->addr + SOCK_CONTROL);
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tifm_sd_exec(host, mrq->cmd);
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@ -553,7 +569,6 @@ static void tifm_sd_end_cmd(unsigned long data)
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del_timer(&host->timer);
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mrq = host->req;
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host->req = NULL;
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host->state = IDLE;
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if (!mrq) {
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printk(KERN_ERR DRIVER_NAME ": no request to complete?\n");
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@ -67,6 +67,7 @@ enum {
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#define TIFM_SOCK_STATE_POWERED 0x00000080
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#define TIFM_FIFO_ENABLE 0x00000001 /* Meaning of this constant is unverified */
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#define TIFM_FIFO_READY 0x00000001 /* Meaning of this constant is unverified */
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#define TIFM_FIFO_INT_SETALL 0x0000ffff
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#define TIFM_FIFO_INTMASK 0x00000005 /* Meaning of this constant is unverified */
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