[ARM] 3565/1: AT91RM9200 MMC update
Patch from Andrew Victor This patch includes code cleanups and minor fixes to the AT91RM9200 MMC driver. 1. Replace calls to DBG() with pr_debug(). 2. 'host' can never be null, so don't bother checking for that case. 3. Remove SA_SAMPLE_RANDOM from request_irq(). [Patch from Matt Mackall] 4. clk_get() doesn't return NULL on error - need to test returned value with IS_ERR(). 5. Free resources if clk_get() or request_irq() fails. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrew Victor
Russell King
Родитель
a3fd4a1b9c
Коммит
b44fb7a09e
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@ -81,13 +81,6 @@
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#undef SUPPORT_4WIRE
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#ifdef CONFIG_MMC_DEBUG
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#define DBG(fmt...) \
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printk(fmt)
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#else
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#define DBG(fmt...) do { } while (0)
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#endif
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static struct clk *mci_clk;
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#define FL_SENT_COMMAND (1 << 0)
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@ -202,50 +195,50 @@ static void at91mci_pre_dma_read(struct at91mci_host *host)
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struct mmc_command *cmd;
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struct mmc_data *data;
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DBG("pre dma read\n");
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pr_debug("pre dma read\n");
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cmd = host->cmd;
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if (!cmd) {
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DBG("no command\n");
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pr_debug("no command\n");
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return;
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}
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data = cmd->data;
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if (!data) {
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DBG("no data\n");
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pr_debug("no data\n");
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return;
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}
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for (i = 0; i < 2; i++) {
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/* nothing left to transfer */
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if (host->transfer_index >= data->sg_len) {
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DBG("Nothing left to transfer (index = %d)\n", host->transfer_index);
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pr_debug("Nothing left to transfer (index = %d)\n", host->transfer_index);
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break;
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}
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/* Check to see if this needs filling */
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if (i == 0) {
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if (at91_mci_read(AT91_PDC_RCR) != 0) {
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DBG("Transfer active in current\n");
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pr_debug("Transfer active in current\n");
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continue;
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}
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}
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else {
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if (at91_mci_read(AT91_PDC_RNCR) != 0) {
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DBG("Transfer active in next\n");
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pr_debug("Transfer active in next\n");
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continue;
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}
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}
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/* Setup the next transfer */
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DBG("Using transfer index %d\n", host->transfer_index);
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pr_debug("Using transfer index %d\n", host->transfer_index);
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sg = &data->sg[host->transfer_index++];
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DBG("sg = %p\n", sg);
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pr_debug("sg = %p\n", sg);
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sg->dma_address = dma_map_page(NULL, sg->page, sg->offset, sg->length, DMA_FROM_DEVICE);
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DBG("dma address = %08X, length = %d\n", sg->dma_address, sg->length);
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pr_debug("dma address = %08X, length = %d\n", sg->dma_address, sg->length);
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if (i == 0) {
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at91_mci_write(AT91_PDC_RPR, sg->dma_address);
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@ -257,7 +250,7 @@ static void at91mci_pre_dma_read(struct at91mci_host *host)
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}
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}
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DBG("pre dma read done\n");
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pr_debug("pre dma read done\n");
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}
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/*
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@ -268,17 +261,17 @@ static void at91mci_post_dma_read(struct at91mci_host *host)
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struct mmc_command *cmd;
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struct mmc_data *data;
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DBG("post dma read\n");
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pr_debug("post dma read\n");
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cmd = host->cmd;
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if (!cmd) {
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DBG("no command\n");
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pr_debug("no command\n");
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return;
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}
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data = cmd->data;
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if (!data) {
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DBG("no data\n");
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pr_debug("no data\n");
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return;
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}
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@ -289,17 +282,17 @@ static void at91mci_post_dma_read(struct at91mci_host *host)
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struct scatterlist *sg;
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DBG("finishing index %d\n", host->in_use_index);
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pr_debug("finishing index %d\n", host->in_use_index);
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sg = &data->sg[host->in_use_index++];
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DBG("Unmapping page %08X\n", sg->dma_address);
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pr_debug("Unmapping page %08X\n", sg->dma_address);
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dma_unmap_page(NULL, sg->dma_address, sg->length, DMA_FROM_DEVICE);
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/* Swap the contents of the buffer */
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buffer = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset;
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DBG("buffer = %p, length = %d\n", buffer, sg->length);
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pr_debug("buffer = %p, length = %d\n", buffer, sg->length);
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data->bytes_xfered += sg->length;
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@ -320,7 +313,7 @@ static void at91mci_post_dma_read(struct at91mci_host *host)
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at91_mci_write(AT91_PDC_PTCR, AT91_PDC_RXTDIS | AT91_PDC_TXTDIS);
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}
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DBG("post dma read done\n");
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pr_debug("post dma read done\n");
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}
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/*
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@ -331,7 +324,7 @@ static void at91_mci_handle_transmitted(struct at91mci_host *host)
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struct mmc_command *cmd;
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struct mmc_data *data;
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DBG("Handling the transmit\n");
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pr_debug("Handling the transmit\n");
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/* Disable the transfer */
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at91_mci_write(AT91_PDC_PTCR, AT91_PDC_RXTDIS | AT91_PDC_TXTDIS);
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@ -387,12 +380,12 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
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/* Not sure if this is needed */
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#if 0
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if ((at91_mci_read(AT91_MCI_SR) & AT91_MCI_RTOE) && (cmd->opcode == 1)) {
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DBG("Clearing timeout\n");
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pr_debug("Clearing timeout\n");
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at91_mci_write(AT91_MCI_ARGR, 0);
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at91_mci_write(AT91_MCI_CMDR, AT91_MCI_OPDCMD);
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while (!(at91_mci_read(AT91_MCI_SR) & AT91_MCI_CMDRDY)) {
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/* spin */
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DBG("Clearing: SR = %08X\n", at91_mci_read(AT91_MCI_SR));
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pr_debug("Clearing: SR = %08X\n", at91_mci_read(AT91_MCI_SR));
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}
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}
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#endif
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@ -439,7 +432,7 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
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/*
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* Set the arguments and send the command
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*/
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DBG("Sending command %d as %08X, arg = %08X, blocks = %d, length = %d (MR = %08lX)\n",
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pr_debug("Sending command %d as %08X, arg = %08X, blocks = %d, length = %d (MR = %08lX)\n",
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cmd->opcode, cmdr, cmd->arg, blocks, block_length, at91_mci_read(AT91_MCI_MR));
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if (!data) {
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@ -491,7 +484,7 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
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at91mci_sg_to_dma(host, data);
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DBG("Transmitting %d bytes\n", host->total_length);
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pr_debug("Transmitting %d bytes\n", host->total_length);
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at91_mci_write(AT91_PDC_TPR, host->physical_address);
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at91_mci_write(AT91_PDC_TCR, host->total_length / 4);
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@ -525,7 +518,7 @@ static void at91mci_process_command(struct at91mci_host *host, struct mmc_comman
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ier = at91_mci_send_command(host, cmd);
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DBG("setting ier to %08X\n", ier);
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pr_debug("setting ier to %08X\n", ier);
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/* Stop on errors or the required value */
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at91_mci_write(AT91_MCI_IER, 0xffff0000 | ier);
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@ -570,7 +563,7 @@ static void at91mci_completed_command(struct at91mci_host *host)
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status = at91_mci_read(AT91_MCI_SR);
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DBG("Status = %08X [%08X %08X %08X %08X]\n",
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pr_debug("Status = %08X [%08X %08X %08X %08X]\n",
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status, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
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if (status & (AT91_MCI_RINDE | AT91_MCI_RDIRE | AT91_MCI_RCRCE |
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@ -590,7 +583,7 @@ static void at91mci_completed_command(struct at91mci_host *host)
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else
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cmd->error = MMC_ERR_FAILED;
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DBG("Error detected and set to %d (cmd = %d, retries = %d)\n",
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pr_debug("Error detected and set to %d (cmd = %d, retries = %d)\n",
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cmd->error, cmd->opcode, cmd->retries);
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}
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}
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@ -621,10 +614,7 @@ static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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struct at91mci_host *host = mmc_priv(mmc);
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unsigned long at91_master_clock = clk_get_rate(mci_clk);
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if (host)
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host->bus_mode = ios->bus_mode;
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else
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printk("MMC: No host for bus_mode\n");
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host->bus_mode = ios->bus_mode;
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if (ios->clock == 0) {
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/* Disable the MCI controller */
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@ -640,15 +630,15 @@ static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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else
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clkdiv = (at91_master_clock / ios->clock) / 2;
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DBG("clkdiv = %d. mcck = %ld\n", clkdiv,
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pr_debug("clkdiv = %d. mcck = %ld\n", clkdiv,
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at91_master_clock / (2 * (clkdiv + 1)));
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}
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if (ios->bus_width == MMC_BUS_WIDTH_4 && host->board->wire4) {
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DBG("MMC: Setting controller bus width to 4\n");
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pr_debug("MMC: Setting controller bus width to 4\n");
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at91_mci_write(AT91_MCI_SDCR, at91_mci_read(AT91_MCI_SDCR) | AT91_MCI_SDCBUS);
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}
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else {
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DBG("MMC: Setting controller bus width to 1\n");
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pr_debug("MMC: Setting controller bus width to 1\n");
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at91_mci_write(AT91_MCI_SDCR, at91_mci_read(AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
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}
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@ -656,7 +646,7 @@ static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
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at91_mci_write(AT91_MCI_MR, (at91_mci_read(AT91_MCI_MR) & ~AT91_MCI_CLKDIV) | clkdiv);
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/* maybe switch power to the card */
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if (host && host->board->vcc_pin) {
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if (host->board->vcc_pin) {
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switch (ios->power_mode) {
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case MMC_POWER_OFF:
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at91_set_gpio_output(host->board->vcc_pin, 0);
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@ -679,11 +669,8 @@ static irqreturn_t at91_mci_irq(int irq, void *devid, struct pt_regs *regs)
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unsigned int int_status;
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if (host == NULL)
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return IRQ_HANDLED;
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int_status = at91_mci_read(AT91_MCI_SR);
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DBG("MCI irq: status = %08X, %08lX, %08lX\n", int_status, at91_mci_read(AT91_MCI_IMR),
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pr_debug("MCI irq: status = %08X, %08lX, %08lX\n", int_status, at91_mci_read(AT91_MCI_IMR),
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int_status & at91_mci_read(AT91_MCI_IMR));
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if ((int_status & at91_mci_read(AT91_MCI_IMR)) & 0xffff0000)
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@ -692,75 +679,75 @@ static irqreturn_t at91_mci_irq(int irq, void *devid, struct pt_regs *regs)
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int_status &= at91_mci_read(AT91_MCI_IMR);
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if (int_status & AT91_MCI_UNRE)
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DBG("MMC: Underrun error\n");
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pr_debug("MMC: Underrun error\n");
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if (int_status & AT91_MCI_OVRE)
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DBG("MMC: Overrun error\n");
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pr_debug("MMC: Overrun error\n");
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if (int_status & AT91_MCI_DTOE)
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DBG("MMC: Data timeout\n");
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pr_debug("MMC: Data timeout\n");
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if (int_status & AT91_MCI_DCRCE)
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DBG("MMC: CRC error in data\n");
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pr_debug("MMC: CRC error in data\n");
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if (int_status & AT91_MCI_RTOE)
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DBG("MMC: Response timeout\n");
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pr_debug("MMC: Response timeout\n");
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if (int_status & AT91_MCI_RENDE)
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DBG("MMC: Response end bit error\n");
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pr_debug("MMC: Response end bit error\n");
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if (int_status & AT91_MCI_RCRCE)
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DBG("MMC: Response CRC error\n");
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pr_debug("MMC: Response CRC error\n");
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if (int_status & AT91_MCI_RDIRE)
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DBG("MMC: Response direction error\n");
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pr_debug("MMC: Response direction error\n");
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if (int_status & AT91_MCI_RINDE)
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DBG("MMC: Response index error\n");
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pr_debug("MMC: Response index error\n");
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/* Only continue processing if no errors */
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if (!completed) {
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if (int_status & AT91_MCI_TXBUFE) {
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DBG("TX buffer empty\n");
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pr_debug("TX buffer empty\n");
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at91_mci_handle_transmitted(host);
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}
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if (int_status & AT91_MCI_RXBUFF) {
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DBG("RX buffer full\n");
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pr_debug("RX buffer full\n");
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at91_mci_write(AT91_MCI_IER, AT91_MCI_CMDRDY);
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}
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if (int_status & AT91_MCI_ENDTX) {
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DBG("Transmit has ended\n");
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pr_debug("Transmit has ended\n");
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}
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if (int_status & AT91_MCI_ENDRX) {
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DBG("Receive has ended\n");
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pr_debug("Receive has ended\n");
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at91mci_post_dma_read(host);
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}
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if (int_status & AT91_MCI_NOTBUSY) {
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DBG("Card is ready\n");
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pr_debug("Card is ready\n");
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at91_mci_write(AT91_MCI_IER, AT91_MCI_CMDRDY);
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}
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if (int_status & AT91_MCI_DTIP) {
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DBG("Data transfer in progress\n");
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pr_debug("Data transfer in progress\n");
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}
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if (int_status & AT91_MCI_BLKE) {
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DBG("Block transfer has ended\n");
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pr_debug("Block transfer has ended\n");
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}
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if (int_status & AT91_MCI_TXRDY) {
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DBG("Ready to transmit\n");
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pr_debug("Ready to transmit\n");
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}
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if (int_status & AT91_MCI_RXRDY) {
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DBG("Ready to receive\n");
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pr_debug("Ready to receive\n");
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}
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if (int_status & AT91_MCI_CMDRDY) {
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DBG("Command ready\n");
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pr_debug("Command ready\n");
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completed = 1;
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}
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}
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at91_mci_write(AT91_MCI_IDR, int_status);
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if (completed) {
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DBG("Completed command\n");
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pr_debug("Completed command\n");
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at91_mci_write(AT91_MCI_IDR, 0xffffffff);
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at91mci_completed_command(host);
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}
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@ -779,10 +766,10 @@ static irqreturn_t at91_mmc_det_irq(int irq, void *_host, struct pt_regs *regs)
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*/
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if (present != host->present) {
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host->present = present;
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DBG("%s: card %s\n", mmc_hostname(host->mmc),
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pr_debug("%s: card %s\n", mmc_hostname(host->mmc),
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present ? "insert" : "remove");
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if (!present) {
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DBG("****** Resetting SD-card bus width ******\n");
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pr_debug("****** Resetting SD-card bus width ******\n");
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at91_mci_write(AT91_MCI_SDCR, 0);
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}
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mmc_detect_change(host->mmc, msecs_to_jiffies(100));
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@ -822,13 +809,13 @@ static int at91_mci_probe(struct platform_device *pdev)
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struct at91mci_host *host;
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int ret;
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DBG("Probe MCI devices\n");
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pr_debug("Probe MCI devices\n");
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at91_mci_disable();
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at91_mci_enable();
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mmc = mmc_alloc_host(sizeof(struct at91mci_host), &pdev->dev);
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if (!mmc) {
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DBG("Failed to allocate mmc host\n");
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pr_debug("Failed to allocate mmc host\n");
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return -ENOMEM;
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}
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@ -854,8 +841,9 @@ static int at91_mci_probe(struct platform_device *pdev)
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* Get Clock
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*/
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mci_clk = clk_get(&pdev->dev, "mci_clk");
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if (!mci_clk) {
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if (IS_ERR(mci_clk)) {
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printk(KERN_ERR "AT91 MMC: no clock defined.\n");
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mmc_free_host(mmc);
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return -ENODEV;
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}
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clk_enable(mci_clk); /* Enable the peripheral clock */
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@ -865,7 +853,10 @@ static int at91_mci_probe(struct platform_device *pdev)
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*/
|
||||
ret = request_irq(AT91_ID_MCI, at91_mci_irq, SA_SHIRQ, DRIVER_NAME, host);
|
||||
if (ret) {
|
||||
DBG("Failed to request MCI interrupt\n");
|
||||
printk(KERN_ERR "Failed to request MCI interrupt\n");
|
||||
clk_disable(mci_clk);
|
||||
clk_put(mci_clk);
|
||||
mmc_free_host(mmc);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
|
@ -886,12 +877,12 @@ static int at91_mci_probe(struct platform_device *pdev)
|
|||
*/
|
||||
if (host->board->det_pin) {
|
||||
ret = request_irq(host->board->det_pin, at91_mmc_det_irq,
|
||||
SA_SAMPLE_RANDOM, DRIVER_NAME, host);
|
||||
0, DRIVER_NAME, host);
|
||||
if (ret)
|
||||
DBG("couldn't allocate MMC detect irq\n");
|
||||
printk(KERN_ERR "couldn't allocate MMC detect irq\n");
|
||||
}
|
||||
|
||||
DBG(KERN_INFO "Added MCI driver\n");
|
||||
pr_debug(KERN_INFO "Added MCI driver\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -924,7 +915,7 @@ static int at91_mci_remove(struct platform_device *pdev)
|
|||
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
DBG("Removed\n");
|
||||
pr_debug("MCI Removed\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
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