[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>
diff --git a/drivers/mmc/at91_mci.c b/drivers/mmc/at91_mci.c
index 42284e1..3228516 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 @@
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 @@
}
}
- DBG("pre dma read done\n");
+ pr_debug("pre dma read done\n");
}
/*
@@ -268,17 +261,17 @@
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 @@
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 @@
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 @@
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 @@
/* 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 @@
/*
* 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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
*/
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 @@
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 @@
* 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 @@
*/
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 @@
*/
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 @@
platform_set_drvdata(pdev, NULL);
- DBG("Removed\n");
+ pr_debug("MCI Removed\n");
return 0;
}