arm/imx/iomux-v1: check for invalid modes in mxc_gpio_mode

mxc_gpio_mode checks for invalid pins and so it returns zero for
success, -EINVAL for invalid pins.

While at it, remove definitions of GPIO_PORT_MAX removed as they are
unused now.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

1 files changed, 49 insertions, 28 deletions

diff --git a/arch/arm/plat-mxc/iomux-v1.c b/arch/arm/plat-mxc/iomux-v1.c
index 5798b35b6cb9..960a02cbcbaf 100644
--- a/arch/arm/plat-mxc/iomux-v1.c
+++ b/arch/arm/plat-mxc/iomux-v1.c
@@ -33,6 +33,7 @@
 #include <mach/iomux-v1.h>
 
 static void __iomem *imx_iomuxv1_baseaddr;
+static unsigned imx_iomuxv1_numports;
 
 static inline unsigned long imx_iomuxv1_readl(unsigned offset)
 {
@@ -120,7 +121,7 @@ static inline void imx_iomuxv1_set_iconfb(
         imx_iomuxv1_rmwl(offset, mask, value);
 }
 
-void mxc_gpio_mode(int gpio_mode)
+int mxc_gpio_mode(int gpio_mode)
 {
         unsigned int pin = gpio_mode & GPIO_PIN_MASK;
         unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
@@ -128,6 +129,9 @@ void mxc_gpio_mode(int gpio_mode)
         unsigned int aout = (gpio_mode >> GPIO_AOUT_SHIFT) & 3;
         unsigned int bout = (gpio_mode >> GPIO_BOUT_SHIFT) & 3;
 
+        if (port >= imx_iomuxv1_numports)
+                return -EINVAL;
+
         /* Pullup enable */
         imx_iomuxv1_set_puen(port, pin, gpio_mode & GPIO_PUEN);
 
@@ -145,50 +149,64 @@ void mxc_gpio_mode(int gpio_mode)
         imx_iomuxv1_set_iconfa(port, pin, aout);
 
         imx_iomuxv1_set_iconfb(port, pin, bout);
+
+        return 0;
 }
 EXPORT_SYMBOL(mxc_gpio_mode);
 
+static int imx_iomuxv1_setup_multiple(const int *list, unsigned count)
+{
+        size_t i;
+        int ret;
+
+        for (i = 0; i < count; ++i) {
+                ret = mxc_gpio_mode(list[i]);
+
+                if (ret)
+                        return ret;
+        }
+
+        return ret;
+}
+
 int mxc_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
                 const char *label)
 {
-        const int *p = pin_list;
-        int i;
-        unsigned gpio;
-        unsigned mode;
-        int ret = -EINVAL;
+        size_t i;
+        int ret;
 
-        for (i = 0; i < count; i++) {
-                gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
-                mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
-
-                if (gpio >= (GPIO_PORT_MAX + 1) * 32)
-                        goto setup_error;
+        for (i = 0; i < count; ++i) {
+                unsigned gpio = pin_list[i] & (GPIO_PIN_MASK | GPIO_PORT_MASK);
 
                 ret = gpio_request(gpio, label);
                 if (ret)
-                        goto setup_error;
+                        goto err_gpio_request;
+        }
 
-                mxc_gpio_mode(gpio | mode);
+        ret = imx_iomuxv1_setup_multiple(pin_list, count);
+        if (ret)
+                goto err_setup;
 
-                p++;
-        }
         return 0;
 
-setup_error:
+err_setup:
+        BUG_ON(i != count);
+
+err_gpio_request:
         mxc_gpio_release_multiple_pins(pin_list, i);
+
         return ret;
 }
 EXPORT_SYMBOL(mxc_gpio_setup_multiple_pins);
 
 void mxc_gpio_release_multiple_pins(const int *pin_list, int count)
 {
-        const int *p = pin_list;
-        int i;
+        size_t i;
+
+        for (i = 0; i < count; ++i) {
+                unsigned gpio = pin_list[i] & (GPIO_PIN_MASK | GPIO_PORT_MASK);
 
-        for (i = 0; i < count; i++) {
-                unsigned gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
                 gpio_free(gpio);
-                p++;
         }
 }
 EXPORT_SYMBOL(mxc_gpio_release_multiple_pins);
@@ -196,19 +214,22 @@ EXPORT_SYMBOL(mxc_gpio_release_multiple_pins);
 static int imx_iomuxv1_init(void)
 {
 #ifdef CONFIG_ARCH_MX1
-        if (cpu_is_mx1())
+        if (cpu_is_mx1()) {
                 imx_iomuxv1_baseaddr = MX1_IO_ADDRESS(MX1_GPIO_BASE_ADDR);
-        else
+                imx_iomuxv1_numports = MX1_NUM_GPIO_PORT;
+        } else
 #endif
 #ifdef CONFIG_MACH_MX21
-        if (cpu_is_mx21())
+        if (cpu_is_mx21()) {
                 imx_iomuxv1_baseaddr = MX21_IO_ADDRESS(MX21_GPIO_BASE_ADDR);
-        else
+                imx_iomuxv1_numports = MX21_NUM_GPIO_PORT;
+        } else
 #endif
 #ifdef CONFIG_MACH_MX27
-        if (cpu_is_mx27())
+        if (cpu_is_mx27()) {
                 imx_iomuxv1_baseaddr = MX27_IO_ADDRESS(MX27_GPIO_BASE_ADDR);
-        else
+                imx_iomuxv1_numports = MX27_NUM_GPIO_PORT;
+        } else
 #endif
                 return -ENODEV;