[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>

1 files changed, 65 insertions, 74 deletions

diff --git a/drivers/mmc/at91_mci.c b/drivers/mmc/at91_mci.c
index 42284e1d4628..3228516b7d19 100644
--- a/drivers/mmc/at91_mci.c
+++ b/drivers/mmc/at91_mci.c
@@ -81,13 +81,6 @@
 
 #undef  SUPPORT_4WIRE
 
-#ifdef CONFIG_MMC_DEBUG
-#define DBG(fmt...)     \
-        printk(fmt)
-#else
-#define DBG(fmt...)     do { } while (0)
-#endif
-
 static struct clk *mci_clk;
 
 #define FL_SENT_COMMAND (1 << 0)
@@ -202,50 +195,50 @@ static void at91mci_pre_dma_read(struct at91mci_host *host)
         struct mmc_command *cmd;
         struct mmc_data *data;
 
-        DBG("pre dma read\n");
+        pr_debug("pre dma read\n");
 
         cmd = host->cmd;
         if (!cmd) {
-                DBG("no command\n");
+                pr_debug("no command\n");
                 return;
         }
 
         data = cmd->data;
         if (!data) {
-                DBG("no data\n");
+                pr_debug("no data\n");
                 return;
         }
 
         for (i = 0; i < 2; i++) {
                 /* nothing left to transfer */
                 if (host->transfer_index >= data->sg_len) {
-                        DBG("Nothing left to transfer (index = %d)\n", host->transfer_index);
+                        pr_debug("Nothing left to transfer (index = %d)\n", host->transfer_index);
                         break;
                 }
 
                 /* Check to see if this needs filling */
                 if (i == 0) {
                         if (at91_mci_read(AT91_PDC_RCR) != 0) {
-                                DBG("Transfer active in current\n");
+                                pr_debug("Transfer active in current\n");
                                 continue;
                         }
                 }
                 else {
                         if (at91_mci_read(AT91_PDC_RNCR) != 0) {
-                                DBG("Transfer active in next\n");
+                                pr_debug("Transfer active in next\n");
                                 continue;
                         }
                 }
 
                 /* Setup the next transfer */
-                DBG("Using transfer index %d\n", host->transfer_index);
+                pr_debug("Using transfer index %d\n", host->transfer_index);
 
                 sg = &data->sg[host->transfer_index++];
-                DBG("sg = %p\n", sg);
+                pr_debug("sg = %p\n", sg);
 
                 sg->dma_address = dma_map_page(NULL, sg->page, sg->offset, sg->length, DMA_FROM_DEVICE);
 
-                DBG("dma address = %08X, length = %d\n", sg->dma_address, sg->length);
+                pr_debug("dma address = %08X, length = %d\n", sg->dma_address, sg->length);
 
                 if (i == 0) {
                         at91_mci_write(AT91_PDC_RPR, sg->dma_address);
@@ -257,7 +250,7 @@ static void at91mci_pre_dma_read(struct at91mci_host *host)
                 }
         }
 
-        DBG("pre dma read done\n");
+        pr_debug("pre dma read done\n");
 }
 
 /*
@@ -268,17 +261,17 @@ static void at91mci_post_dma_read(struct at91mci_host *host)
         struct mmc_command *cmd;
         struct mmc_data *data;
 
-        DBG("post dma read\n");
+        pr_debug("post dma read\n");
 
         cmd = host->cmd;
         if (!cmd) {
-                DBG("no command\n");
+                pr_debug("no command\n");
                 return;
         }
 
         data = cmd->data;
         if (!data) {
-                DBG("no data\n");
+                pr_debug("no data\n");
                 return;
         }
 
@@ -289,17 +282,17 @@ static void at91mci_post_dma_read(struct at91mci_host *host)
 
                 struct scatterlist *sg;
 
-                DBG("finishing index %d\n", host->in_use_index);
+                pr_debug("finishing index %d\n", host->in_use_index);
 
                 sg = &data->sg[host->in_use_index++];
 
-                DBG("Unmapping page %08X\n", sg->dma_address);
+                pr_debug("Unmapping page %08X\n", sg->dma_address);
 
                 dma_unmap_page(NULL, sg->dma_address, sg->length, DMA_FROM_DEVICE);
 
                 /* Swap the contents of the buffer */
                 buffer = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset;
-                DBG("buffer = %p, length = %d\n", buffer, sg->length);
+                pr_debug("buffer = %p, length = %d\n", buffer, sg->length);
 
                 data->bytes_xfered += sg->length;
 
@@ -320,7 +313,7 @@ static void at91mci_post_dma_read(struct at91mci_host *host)
                 at91_mci_write(AT91_PDC_PTCR, AT91_PDC_RXTDIS | AT91_PDC_TXTDIS);
         }
 
-        DBG("post dma read done\n");
+        pr_debug("post dma read done\n");
 }
 
 /*
@@ -331,7 +324,7 @@ static void at91_mci_handle_transmitted(struct at91mci_host *host)
         struct mmc_command *cmd;
         struct mmc_data *data;
 
-        DBG("Handling the transmit\n");
+        pr_debug("Handling the transmit\n");
 
         /* Disable the transfer */
         at91_mci_write(AT91_PDC_PTCR, AT91_PDC_RXTDIS | AT91_PDC_TXTDIS);
@@ -387,12 +380,12 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
         /* Not sure if this is needed */
 #if 0
         if ((at91_mci_read(AT91_MCI_SR) & AT91_MCI_RTOE) && (cmd->opcode == 1)) {
-                DBG("Clearing timeout\n");
+                pr_debug("Clearing timeout\n");
                 at91_mci_write(AT91_MCI_ARGR, 0);
                 at91_mci_write(AT91_MCI_CMDR, AT91_MCI_OPDCMD);
                 while (!(at91_mci_read(AT91_MCI_SR) & AT91_MCI_CMDRDY)) {
                         /* spin */
-                        DBG("Clearing: SR = %08X\n", at91_mci_read(AT91_MCI_SR));
+                        pr_debug("Clearing: SR = %08X\n", at91_mci_read(AT91_MCI_SR));
                 }
         }
 #endif
@@ -439,7 +432,7 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
         /*
          * Set the arguments and send the command
          */
-        DBG("Sending command %d as %08X, arg = %08X, blocks = %d, length = %d (MR = %08lX)\n",
+        pr_debug("Sending command %d as %08X, arg = %08X, blocks = %d, length = %d (MR = %08lX)\n",
                 cmd->opcode, cmdr, cmd->arg, blocks, block_length, at91_mci_read(AT91_MCI_MR));
 
         if (!data) {
@@ -491,7 +484,7 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
 
                         at91mci_sg_to_dma(host, data);
 
-                        DBG("Transmitting %d bytes\n", host->total_length);
+                        pr_debug("Transmitting %d bytes\n", host->total_length);
 
                         at91_mci_write(AT91_PDC_TPR, host->physical_address);
                         at91_mci_write(AT91_PDC_TCR, host->total_length / 4);
@@ -525,7 +518,7 @@ static void at91mci_process_command(struct at91mci_host *host, struct mmc_comman
 
         ier = at91_mci_send_command(host, cmd);
 
-        DBG("setting ier to %08X\n", ier);
+        pr_debug("setting ier to %08X\n", ier);
 
         /* Stop on errors or the required value */
         at91_mci_write(AT91_MCI_IER, 0xffff0000 | ier);
@@ -570,7 +563,7 @@ static void at91mci_completed_command(struct at91mci_host *host)
 
         status = at91_mci_read(AT91_MCI_SR);
 
-        DBG("Status = %08X [%08X %08X %08X %08X]\n",
+        pr_debug("Status = %08X [%08X %08X %08X %08X]\n",
                  status, cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
 
         if (status & (AT91_MCI_RINDE | AT91_MCI_RDIRE | AT91_MCI_RCRCE |
@@ -590,7 +583,7 @@ static void at91mci_completed_command(struct at91mci_host *host)
                         else
                                 cmd->error = MMC_ERR_FAILED;
 
-                        DBG("Error detected and set to %d (cmd = %d, retries = %d)\n",
+                        pr_debug("Error detected and set to %d (cmd = %d, retries = %d)\n",
                                  cmd->error, cmd->opcode, cmd->retries);
                 }
         }
@@ -621,10 +614,7 @@ static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         struct at91mci_host *host = mmc_priv(mmc);
         unsigned long at91_master_clock = clk_get_rate(mci_clk);
 
-        if (host)
-                host->bus_mode = ios->bus_mode;
-        else
-                printk("MMC: No host for bus_mode\n");
+        host->bus_mode = ios->bus_mode;
 
         if (ios->clock == 0) {
                 /* Disable the MCI controller */
@@ -640,15 +630,15 @@ static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                 else
                         clkdiv = (at91_master_clock / ios->clock) / 2;
 
-                DBG("clkdiv = %d. mcck = %ld\n", clkdiv,
+                pr_debug("clkdiv = %d. mcck = %ld\n", clkdiv,
                         at91_master_clock / (2 * (clkdiv + 1)));
         }
         if (ios->bus_width == MMC_BUS_WIDTH_4 && host->board->wire4) {
-                DBG("MMC: Setting controller bus width to 4\n");
+                pr_debug("MMC: Setting controller bus width to 4\n");
                 at91_mci_write(AT91_MCI_SDCR, at91_mci_read(AT91_MCI_SDCR) | AT91_MCI_SDCBUS);
         }
         else {
-                DBG("MMC: Setting controller bus width to 1\n");
+                pr_debug("MMC: Setting controller bus width to 1\n");
                 at91_mci_write(AT91_MCI_SDCR, at91_mci_read(AT91_MCI_SDCR) & ~AT91_MCI_SDCBUS);
         }
 
@@ -656,7 +646,7 @@ static void at91_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         at91_mci_write(AT91_MCI_MR, (at91_mci_read(AT91_MCI_MR) & ~AT91_MCI_CLKDIV) | clkdiv);
 
         /* maybe switch power to the card */
-        if (host && host->board->vcc_pin) {
+        if (host->board->vcc_pin) {
                 switch (ios->power_mode) {
                         case MMC_POWER_OFF:
                                 at91_set_gpio_output(host->board->vcc_pin, 0);
@@ -679,11 +669,8 @@ static irqreturn_t at91_mci_irq(int irq, void *devid, struct pt_regs *regs)
 
         unsigned int int_status;
 
-        if (host == NULL)
-                return IRQ_HANDLED;
-
         int_status = at91_mci_read(AT91_MCI_SR);
-        DBG("MCI irq: status = %08X, %08lX, %08lX\n", int_status, at91_mci_read(AT91_MCI_IMR),
+        pr_debug("MCI irq: status = %08X, %08lX, %08lX\n", int_status, at91_mci_read(AT91_MCI_IMR),
                 int_status & at91_mci_read(AT91_MCI_IMR));
 
         if ((int_status & at91_mci_read(AT91_MCI_IMR)) & 0xffff0000)
@@ -692,75 +679,75 @@ static irqreturn_t at91_mci_irq(int irq, void *devid, struct pt_regs *regs)
         int_status &= at91_mci_read(AT91_MCI_IMR);
 
         if (int_status & AT91_MCI_UNRE)
-                DBG("MMC: Underrun error\n");
+                pr_debug("MMC: Underrun error\n");
         if (int_status & AT91_MCI_OVRE)
-                DBG("MMC: Overrun error\n");
+                pr_debug("MMC: Overrun error\n");
         if (int_status & AT91_MCI_DTOE)
-                DBG("MMC: Data timeout\n");
+                pr_debug("MMC: Data timeout\n");
         if (int_status & AT91_MCI_DCRCE)
-                DBG("MMC: CRC error in data\n");
+                pr_debug("MMC: CRC error in data\n");
         if (int_status & AT91_MCI_RTOE)
-                DBG("MMC: Response timeout\n");
+                pr_debug("MMC: Response timeout\n");
         if (int_status & AT91_MCI_RENDE)
-                DBG("MMC: Response end bit error\n");
+                pr_debug("MMC: Response end bit error\n");
         if (int_status & AT91_MCI_RCRCE)
-                DBG("MMC: Response CRC error\n");
+                pr_debug("MMC: Response CRC error\n");
         if (int_status & AT91_MCI_RDIRE)
-                DBG("MMC: Response direction error\n");
+                pr_debug("MMC: Response direction error\n");
         if (int_status & AT91_MCI_RINDE)
-                DBG("MMC: Response index error\n");
+                pr_debug("MMC: Response index error\n");
 
         /* Only continue processing if no errors */
         if (!completed) {
                 if (int_status & AT91_MCI_TXBUFE) {
-                        DBG("TX buffer empty\n");
+                        pr_debug("TX buffer empty\n");
                         at91_mci_handle_transmitted(host);
                 }
 
                 if (int_status & AT91_MCI_RXBUFF) {
-                        DBG("RX buffer full\n");
+                        pr_debug("RX buffer full\n");
                         at91_mci_write(AT91_MCI_IER, AT91_MCI_CMDRDY);
                 }
 
                 if (int_status & AT91_MCI_ENDTX) {
-                        DBG("Transmit has ended\n");
+                        pr_debug("Transmit has ended\n");
                 }
 
                 if (int_status & AT91_MCI_ENDRX) {
-                        DBG("Receive has ended\n");
+                        pr_debug("Receive has ended\n");
                         at91mci_post_dma_read(host);
                 }
 
                 if (int_status & AT91_MCI_NOTBUSY) {
-                        DBG("Card is ready\n");
+                        pr_debug("Card is ready\n");
                         at91_mci_write(AT91_MCI_IER, AT91_MCI_CMDRDY);
                 }
 
                 if (int_status & AT91_MCI_DTIP) {
-                        DBG("Data transfer in progress\n");
+                        pr_debug("Data transfer in progress\n");
                 }
 
                 if (int_status & AT91_MCI_BLKE) {
-                        DBG("Block transfer has ended\n");
+                        pr_debug("Block transfer has ended\n");
                 }
 
                 if (int_status & AT91_MCI_TXRDY) {
-                        DBG("Ready to transmit\n");
+                        pr_debug("Ready to transmit\n");
                 }
 
                 if (int_status & AT91_MCI_RXRDY) {
-                        DBG("Ready to receive\n");
+                        pr_debug("Ready to receive\n");
                 }
 
                 if (int_status & AT91_MCI_CMDRDY) {
-                        DBG("Command ready\n");
+                        pr_debug("Command ready\n");
                         completed = 1;
                 }
         }
         at91_mci_write(AT91_MCI_IDR, int_status);
 
         if (completed) {
-                DBG("Completed command\n");
+                pr_debug("Completed command\n");
                 at91_mci_write(AT91_MCI_IDR, 0xffffffff);
                 at91mci_completed_command(host);
         }
@@ -779,10 +766,10 @@ static irqreturn_t at91_mmc_det_irq(int irq, void *_host, struct pt_regs *regs)
          */
         if (present != host->present) {
                 host->present = present;
-                DBG("%s: card %s\n", mmc_hostname(host->mmc),
+                pr_debug("%s: card %s\n", mmc_hostname(host->mmc),
                         present ? "insert" : "remove");
                 if (!present) {
-                        DBG("****** Resetting SD-card bus width ******\n");
+                        pr_debug("****** Resetting SD-card bus width ******\n");
                         at91_mci_write(AT91_MCI_SDCR, 0);
                 }
                 mmc_detect_change(host->mmc, msecs_to_jiffies(100));
@@ -822,13 +809,13 @@ static int at91_mci_probe(struct platform_device *pdev)
         struct at91mci_host *host;
         int ret;
 
-        DBG("Probe MCI devices\n");
+        pr_debug("Probe MCI devices\n");
         at91_mci_disable();
         at91_mci_enable();
 
         mmc = mmc_alloc_host(sizeof(struct at91mci_host), &pdev->dev);
         if (!mmc) {
-                DBG("Failed to allocate mmc host\n");
+                pr_debug("Failed to allocate mmc host\n");
                 return -ENOMEM;
         }
 
@@ -854,8 +841,9 @@ static int at91_mci_probe(struct platform_device *pdev)
          * Get Clock
          */
         mci_clk = clk_get(&pdev->dev, "mci_clk");
-        if (!mci_clk) {
+        if (IS_ERR(mci_clk)) {
                 printk(KERN_ERR "AT91 MMC: no clock defined.\n");
+                mmc_free_host(mmc);
                 return -ENODEV;
         }
         clk_enable(mci_clk);                    /* Enable the peripheral clock */
@@ -865,7 +853,10 @@ static int at91_mci_probe(struct platform_device *pdev)
          */
         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;
 }