s3cmci: add better support for no card detect or write protect available

Add better support for omitting either the card detect or the write
protect GPIOs if the board does not support it.  Add the fields
no_wprotect and no_detect to the platform data which when set indicate the
absence of the respective GPIOs.

Note, this also fixes a minor bug where it tries to free IRQ0 if there is
no detect gpio available.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/arm/plat-s3c24xx/include/plat/mci.h

@@ -2,6 +2,8 @@
 #define _ARCH_MCI_H
 
 struct s3c24xx_mci_pdata {
+	unsigned int	no_wprotect : 1;
+	unsigned int	no_detect : 1;
 	unsigned int	wprotect_invert : 1;
 	unsigned int	detect_invert : 1;   /* set => detect active high. */
 	unsigned int	use_dma : 1;

drivers/mmc/host/s3cmci.c

@@ -1299,7 +1299,7 @@ static int s3cmci_get_ro(struct mmc_host *mmc)
 	struct s3c24xx_mci_pdata *pdata = host->pdata;
 	int ret;
 
-	if (pdata->gpio_wprotect == 0)
+	if (pdata->no_wprotect)
 		return 0;
 
 	ret = s3c2410_gpio_getpin(pdata->gpio_wprotect);
@@ -1647,30 +1647,34 @@ static int __devinit s3cmci_probe(struct platform_device *pdev)
 	disable_irq(host->irq);
 	host->irq_state = false;
 
-	if (host->pdata->gpio_detect) {
+	if (!host->pdata->no_detect) {
 		ret = gpio_request(host->pdata->gpio_detect, "s3cmci detect");
 		if (ret) {
 			dev_err(&pdev->dev, "failed to get detect gpio\n");
 			goto probe_free_irq;
 		}
-	}
-
-	host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
 
-	if (host->irq_cd >= 0) {
-		if (request_irq(host->irq_cd, s3cmci_irq_cd,
-				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
-				DRIVER_NAME, host)) {
-			dev_err(&pdev->dev, "can't get card detect irq.\n");
-			ret = -ENOENT;
-			goto probe_free_gpio_cd;
+		host->irq_cd = s3c2410_gpio_getirq(host->pdata->gpio_detect);
+
+		if (host->irq_cd >= 0) {
+			if (request_irq(host->irq_cd, s3cmci_irq_cd,
+					IRQF_TRIGGER_RISING |
+					IRQF_TRIGGER_FALLING,
+					DRIVER_NAME, host)) {
+				dev_err(&pdev->dev,
+					"can't get card detect irq.\n");
+				ret = -ENOENT;
+				goto probe_free_gpio_cd;
+			}
+		} else {
+			dev_warn(&pdev->dev,
+				 "host detect has no irq available\n");
+			gpio_direction_input(host->pdata->gpio_detect);
 		}
-	} else {
-		dev_warn(&pdev->dev, "host detect has no irq available\n");
-		gpio_direction_input(host->pdata->gpio_detect);
-	}
+	} else
+		host->irq_cd = -1;
 
-	if (host->pdata->gpio_wprotect) {
+	if (!host->pdata->no_wprotect) {
 		ret = gpio_request(host->pdata->gpio_wprotect, "s3cmci wp");
 		if (ret) {
 			dev_err(&pdev->dev, "failed to get writeprotect\n");
@@ -1774,11 +1778,11 @@ static int __devinit s3cmci_probe(struct platform_device *pdev)
 		s3c2410_dma_free(host->dma, &s3cmci_dma_client);
 
  probe_free_gpio_wp:
-	if (host->pdata->gpio_wprotect)
+	if (!host->pdata->no_wprotect)
 		gpio_free(host->pdata->gpio_wprotect);
 
  probe_free_gpio_cd:
-	if (host->pdata->gpio_detect)
+	if (!host->pdata->no_detect)
 		gpio_free(host->pdata->gpio_detect);
 
  probe_free_irq_cd:
@@ -1837,10 +1841,10 @@ static int __devexit s3cmci_remove(struct platform_device *pdev)
 
 	free_irq(host->irq, host);
 
-	if (pd->gpio_wprotect)
+	if (!pd->no_wprotect)
 		gpio_free(pd->gpio_wprotect);
 
-	if (pd->gpio_detect)
+	if (!pd->no_detect)
 		gpio_free(pd->gpio_detect);
 
 	for (i = S3C2410_GPE(5); i <= S3C2410_GPE(10); i++)