[ARM] 3429/1: ARM: OMAP: 4/8 Update GPIO

Patch from Tony Lindgren

Update OMAP GPIO code from linux-omap tree:

- Fix omap16xx edge control by Juha Yrjola
- Support for additional omap16xx trigger modes by Dirk Behme
- Fix edge detection by Tony Lindgren et al.
- Better support for omap15xx and omap310 by Andrej Zaborowski
- Fix omap15xx interrupt bug by Petukhov Nikolay

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 61 insertions, 25 deletions

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index b4d5b9e4bfce..d3c8ea7eecfd 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -174,7 +174,7 @@ static int gpio_bank_count;
 static inline struct gpio_bank *get_gpio_bank(int gpio)
 {
 #ifdef CONFIG_ARCH_OMAP15XX
-        if (cpu_is_omap1510()) {
+        if (cpu_is_omap15xx()) {
                 if (OMAP_GPIO_IS_MPUIO(gpio))
                         return &gpio_bank[0];
                 return &gpio_bank[1];
@@ -223,7 +223,7 @@ static inline int gpio_valid(int gpio)
                 return 0;
         }
 #ifdef CONFIG_ARCH_OMAP15XX
-        if (cpu_is_omap1510() && gpio < 16)
+        if (cpu_is_omap15xx() && gpio < 16)
                 return 0;
 #endif
 #if defined(CONFIG_ARCH_OMAP16XX)
@@ -402,13 +402,13 @@ static inline void set_24xx_gpio_triggering(void __iomem *base, int gpio, int tr
         u32 gpio_bit = 1 << gpio;
 
         MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT0, gpio_bit,
-                trigger & IRQT_LOW);
+                trigger & __IRQT_LOWLVL);
         MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT1, gpio_bit,
-                trigger & IRQT_HIGH);
+                trigger & __IRQT_HIGHLVL);
         MOD_REG_BIT(OMAP24XX_GPIO_RISINGDETECT, gpio_bit,
-                trigger & IRQT_RISING);
+                trigger & __IRQT_RISEDGE);
         MOD_REG_BIT(OMAP24XX_GPIO_FALLINGDETECT, gpio_bit,
-                trigger & IRQT_FALLING);
+                trigger & __IRQT_FALEDGE);
         /* FIXME: Possibly do 'set_irq_handler(j, do_level_IRQ)' if only level
          * triggering requested. */
 }
@@ -422,9 +422,9 @@ static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger)
         case METHOD_MPUIO:
                 reg += OMAP_MPUIO_GPIO_INT_EDGE;
                 l = __raw_readl(reg);
-                if (trigger == IRQT_RISING)
+                if (trigger & __IRQT_RISEDGE)
                         l |= 1 << gpio;
-                else if (trigger == IRQT_FALLING)
+                else if (trigger & __IRQT_FALEDGE)
                         l &= ~(1 << gpio);
                 else
                         goto bad;
@@ -432,9 +432,9 @@ static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger)
         case METHOD_GPIO_1510:
                 reg += OMAP1510_GPIO_INT_CONTROL;
                 l = __raw_readl(reg);
-                if (trigger == IRQT_RISING)
+                if (trigger & __IRQT_RISEDGE)
                         l |= 1 << gpio;
-                else if (trigger == IRQT_FALLING)
+                else if (trigger & __IRQT_FALEDGE)
                         l &= ~(1 << gpio);
                 else
                         goto bad;
@@ -446,20 +446,21 @@ static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger)
                         reg += OMAP1610_GPIO_EDGE_CTRL1;
                 gpio &= 0x07;
                 /* We allow only edge triggering, i.e. two lowest bits */
-                if (trigger & ~IRQT_BOTHEDGE)
+                if (trigger & (__IRQT_LOWLVL | __IRQT_HIGHLVL))
                         BUG();
-                /* NOTE: knows __IRQT_{FAL,RIS}EDGE match OMAP hardware */
-                trigger &= 0x03;
                 l = __raw_readl(reg);
                 l &= ~(3 << (gpio << 1));
-                l |= trigger << (gpio << 1);
+                if (trigger & __IRQT_RISEDGE)
+                        l |= 2 << (gpio << 1);
+                if (trigger & __IRQT_FALEDGE)
+                        l |= 1 << (gpio << 1);
                 break;
         case METHOD_GPIO_730:
                 reg += OMAP730_GPIO_INT_CONTROL;
                 l = __raw_readl(reg);
-                if (trigger == IRQT_RISING)
+                if (trigger & __IRQT_RISEDGE)
                         l |= 1 << gpio;
-                else if (trigger == IRQT_FALLING)
+                else if (trigger & __IRQT_FALEDGE)
                         l &= ~(1 << gpio);
                 else
                         goto bad;
@@ -491,7 +492,9 @@ static int gpio_irq_type(unsigned irq, unsigned type)
         if (check_gpio(gpio) < 0)
                 return -EINVAL;
 
-        if (type & (__IRQT_LOWLVL|__IRQT_HIGHLVL|IRQT_PROBE))
+        if (type & IRQT_PROBE)
+                return -EINVAL;
+        if (!cpu_is_omap24xx() && (type & (__IRQT_LOWLVL|__IRQT_HIGHLVL)))
                 return -EINVAL;
 
         bank = get_gpio_bank(gpio);
@@ -755,13 +758,32 @@ static void gpio_irq_handler(unsigned int irq, struct irqdesc *desc,
         if (bank->method == METHOD_GPIO_24XX)
                 isr_reg = bank->base + OMAP24XX_GPIO_IRQSTATUS1;
 #endif
-
         while(1) {
-                isr = __raw_readl(isr_reg);
-                _enable_gpio_irqbank(bank, isr, 0);
-                _clear_gpio_irqbank(bank, isr);
-                _enable_gpio_irqbank(bank, isr, 1);
-                desc->chip->unmask(irq);
+                u32 isr_saved, level_mask = 0;
+
+                isr_saved = isr = __raw_readl(isr_reg);
+
+                if (cpu_is_omap15xx() && (bank->method == METHOD_MPUIO))
+                        isr &= 0x0000ffff;
+
+                if (cpu_is_omap24xx())
+                        level_mask =
+                                __raw_readl(bank->base +
+                                        OMAP24XX_GPIO_LEVELDETECT0) |
+                                __raw_readl(bank->base +
+                                        OMAP24XX_GPIO_LEVELDETECT1);
+
+                /* clear edge sensitive interrupts before handler(s) are
+                called so that we don't miss any interrupt occurred while
+                executing them */
+                _enable_gpio_irqbank(bank, isr_saved & ~level_mask, 0);
+                _clear_gpio_irqbank(bank, isr_saved & ~level_mask);
+                _enable_gpio_irqbank(bank, isr_saved & ~level_mask, 1);
+
+                /* if there is only edge sensitive GPIO pin interrupts
+                configured, we could unmask GPIO bank interrupt immediately */
+                if (!level_mask)
+                        desc->chip->unmask(irq);
 
                 if (!isr)
                         break;
@@ -774,6 +796,20 @@ static void gpio_irq_handler(unsigned int irq, struct irqdesc *desc,
                         d = irq_desc + gpio_irq;
                         desc_handle_irq(gpio_irq, d, regs);
                 }
+
+                if (cpu_is_omap24xx()) {
+                        /* clear level sensitive interrupts after handler(s) */
+                        _enable_gpio_irqbank(bank, isr_saved & level_mask, 0);
+                        _clear_gpio_irqbank(bank, isr_saved & level_mask);
+                        _enable_gpio_irqbank(bank, isr_saved & level_mask, 1);
+                }
+
+                /* if bank has any level sensitive GPIO pin interrupt
+                configured, we must unmask the bank interrupt only after
+                handler(s) are executed in order to avoid spurious bank
+                interrupt */
+                if (level_mask)
+                        desc->chip->unmask(irq);
         }
 }
 
@@ -848,7 +884,7 @@ static int __init _omap_gpio_init(void)
 
         initialized = 1;
 
-        if (cpu_is_omap1510()) {
+        if (cpu_is_omap15xx()) {
                 gpio_ick = clk_get(NULL, "arm_gpio_ck");
                 if (IS_ERR(gpio_ick))
                         printk("Could not get arm_gpio_ck\n");
@@ -869,7 +905,7 @@ static int __init _omap_gpio_init(void)
         }
 
 #ifdef CONFIG_ARCH_OMAP15XX
-        if (cpu_is_omap1510()) {
+        if (cpu_is_omap15xx()) {
                 printk(KERN_INFO "OMAP1510 GPIO hardware\n");
                 gpio_bank_count = 2;
                 gpio_bank = gpio_bank_1510;