[ARM] pxa: add support for additional GPIOs on PXA26x

Original patch from Marek Vasut, the problems with PXA26x are:

1. there are additional 4 GPIOs 86,87,88,89 have their direction bits
   inverted in GPDR2, as well as their alternate function bits being
   '1' for their GPIO functionality in GAFRx

2. there is no easy way to decide if the processor is a pxa26x or a
   pxa250/pxa255 at run-time, so the assumption here is the pxa26x
   will be treated as one of the pxa25x variants, and board code
   should have a better knowledge of the processor it is featured

Introduce pxa26x_init_irq() for the second purpose, and treat the
additional GPIOs > 85 on PXA25x specially.

Kconfig option CONFIG_CPU_PXA26x is introduced to optimize the code
a bit when PXA26x support isn't needed. Board config options have
to select this to enable the support for PXA26x.

__gpio_is_inverted() will be optimized way when CONFIG_CPU_PXA26x
isn't selected.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>

arch/arm/mach-pxa/Kconfig

@@ -394,6 +394,12 @@ config PXA27x
 	help
 	  Select code specific to PXA27x variants
 
+config CPU_PXA26x
+	bool
+	select PXA25x
+	help
+	  Select code specific to PXA26x (codename Dalhart)
+
 config PXA3xx
 	bool
 	help

arch/arm/mach-pxa/gpio.c

@@ -33,6 +33,18 @@ struct pxa_gpio_chip {
 
 int pxa_last_gpio;
 
+#ifdef CONFIG_CPU_PXA26x
+/* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
+ * as well as their Alternate Function value being '1' for GPIO in GAFRx.
+ */
+static int __gpio_is_inverted(unsigned gpio)
+{
+	return cpu_is_pxa25x() && gpio > 85;
+}
+#else
+#define __gpio_is_inverted(gpio)	(0)
+#endif
+
 /*
  * Configure pins for GPIO or other functions
  */
@@ -75,7 +87,10 @@ static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 	gpdr = pxa->regbase + GPDR_OFFSET;
 	local_irq_save(flags);
 	value = __raw_readl(gpdr);
-	value &= ~mask;
+	if (__gpio_is_inverted(chip->base + offset))
+		value |= mask;
+	else
+		value &= ~mask;
 	__raw_writel(value, gpdr);
 	local_irq_restore(flags);
 
@@ -97,7 +112,10 @@ static int pxa_gpio_direction_output(struct gpio_chip *chip,
 	gpdr = pxa->regbase + GPDR_OFFSET;
 	local_irq_save(flags);
 	tmp = __raw_readl(gpdr);
-	tmp |= mask;
+	if (__gpio_is_inverted(chip->base + offset))
+		tmp &= ~mask;
+	else
+		tmp |= mask;
 	__raw_writel(tmp, gpdr);
 	local_irq_restore(flags);
 
@@ -173,10 +191,17 @@ static unsigned long GPIO_IRQ_mask[4];
  */
 static int __gpio_is_occupied(unsigned gpio)
 {
-	if (cpu_is_pxa25x() || cpu_is_pxa27x())
-		return GAFR(gpio) & (0x3 << (((gpio) & 0xf) * 2));
-	else
-		return 0;
+	if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
+		int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
+		int dir = GPDR(gpio) & GPIO_bit(gpio);
+
+		if (__gpio_is_inverted(gpio))
+			return af != 1 || dir == 0;
+		else
+			return af != 0 || dir != 0;
+	}
+
+	return 0;
 }
 
 static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
@@ -190,9 +215,8 @@ static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
 		/* Don't mess with enabled GPIOs using preconfigured edges or
 		 * GPIOs set to alternate function or to output during probe
 		 */
-		if ((GPIO_IRQ_rising_edge[idx] |
-		     GPIO_IRQ_falling_edge[idx] |
-		     GPDR(gpio)) & GPIO_bit(gpio))
+		if ((GPIO_IRQ_rising_edge[idx] & GPIO_bit(gpio)) ||
+		    (GPIO_IRQ_falling_edge[idx] & GPIO_bit(gpio)))
 			return 0;
 
 		if (__gpio_is_occupied(gpio))
@@ -201,7 +225,10 @@ static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
 		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 	}
 
-	GPDR(gpio) &= ~GPIO_bit(gpio);
+	if (__gpio_is_inverted(gpio))
+		GPDR(gpio) |= GPIO_bit(gpio);
+	else
+		GPDR(gpio) &= ~GPIO_bit(gpio);
 
 	if (type & IRQ_TYPE_EDGE_RISING)
 		__set_bit(gpio, GPIO_IRQ_rising_edge);

arch/arm/mach-pxa/include/mach/mfp-pxa25x.h

@@ -158,4 +158,35 @@
 #define GPIO76_LCD_PCLK		MFP_CFG_OUT(GPIO76, AF2, DRIVE_LOW)
 #define GPIO77_LCD_BIAS		MFP_CFG_OUT(GPIO77, AF2, DRIVE_LOW)
 
+#ifdef CONFIG_CPU_PXA26x
+/* GPIO */
+#define GPIO85_GPIO		MFP_CFG_IN(GPIO85, AF0)
+#define GPIO86_GPIO		MFP_CFG_IN(GPIO86, AF1)
+#define GPIO87_GPIO		MFP_CFG_IN(GPIO87, AF1)
+#define GPIO88_GPIO		MFP_CFG_IN(GPIO88, AF1)
+#define GPIO89_GPIO		MFP_CFG_IN(GPIO89, AF1)
+
+/* SDRAM */
+#define GPIO86_nSDCS2		MFP_CFG_OUT(GPIO86, AF0, DRIVE_HIGH)
+#define GPIO87_nSDCS3		MFP_CFG_OUT(GPIO87, AF0, DRIVE_HIGH)
+#define GPIO88_RDnWR		MFP_CFG_OUT(GPIO88, AF0, DRIVE_HIGH)
+#define GPIO89_nACRESET		MFP_CFG_OUT(GPIO89, AF0, DRIVE_HIGH)
+
+/* USB */
+#define GPIO9_USB_RCV		MFP_CFG_IN(GPIO9, AF1)
+#define GPIO32_USB_VP		MFP_CFG_IN(GPIO32, AF2)
+#define GPIO34_USB_VM		MFP_CFG_IN(GPIO34, AF2)
+#define GPIO39_USB_VPO		MFP_CFG_OUT(GPIO39, AF3, DRIVE_LOW)
+#define GPIO56_USB_VMO		MFP_CFG_OUT(GPIO56, AF1, DRIVE_LOW)
+#define GPIO57_USB_nOE		MFP_CFG_OUT(GPIO57, AF1, DRIVE_HIGH)
+
+/* ASSP */
+#define GPIO28_ASSP_BITCLK_IN	MFP_CFG_IN(GPIO28, AF3)
+#define GPIO28_ASSP_BITCLK_OUT	MFP_CFG_OUT(GPIO28, AF3, DRIVE_LOW)
+#define GPIO29_ASSP_RXD		MFP_CFG_IN(GPIO29, AF3)
+#define GPIO30_ASSP_TXD		MFP_CFG_OUT(GPIO30, AF3, DRIVE_LOW)
+#define GPIO31_ASSP_SFRM_IN	MFP_CFG_IN(GPIO31, AF1)
+#define GPIO31_ASSP_SFRM_OUT	MFP_CFG_OUT(GPIO31, AF3, DRIVE_LOW)
+#endif
+
 #endif /* __ASM_ARCH_MFP_PXA25X_H */

arch/arm/mach-pxa/mfp-pxa2xx.c

@@ -38,6 +38,7 @@ struct gpio_desc {
 	unsigned	valid		: 1;
 	unsigned	can_wakeup	: 1;
 	unsigned	keypad_gpio	: 1;
+	unsigned	dir_inverted	: 1;
 	unsigned int	mask; /* bit mask in PWER or PKWR */
 	unsigned int	mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
 	unsigned long	config;
@@ -54,7 +55,7 @@ static int __mfp_config_gpio(unsigned gpio, unsigned long c)
 	int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
 	int shft = (gpio & 0xf) << 1;
 	int fn = MFP_AF(c);
-	int dir = c & MFP_DIR_OUT;
+	int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
 
 	if (fn > 3)
 		return -EINVAL;
@@ -68,7 +69,7 @@ static int __mfp_config_gpio(unsigned gpio, unsigned long c)
 	else
 		GAFR_U(bank) = gafr;
 
-	if (dir == MFP_DIR_OUT)
+	if (is_out ^ gpio_desc[gpio].dir_inverted)
 		GPDR(gpio) |= mask;
 	else
 		GPDR(gpio) &= ~mask;
@@ -77,11 +78,11 @@ static int __mfp_config_gpio(unsigned gpio, unsigned long c)
 	switch (c & MFP_LPM_STATE_MASK) {
 	case MFP_LPM_DRIVE_HIGH:
 		PGSR(bank) |= mask;
-		dir = MFP_DIR_OUT;
+		is_out = 1;
 		break;
 	case MFP_LPM_DRIVE_LOW:
 		PGSR(bank) &= ~mask;
-		dir = MFP_DIR_OUT;
+		is_out = 1;
 		break;
 	case MFP_LPM_DEFAULT:
 		break;
@@ -92,7 +93,7 @@ static int __mfp_config_gpio(unsigned gpio, unsigned long c)
 		break;
 	}
 
-	if (dir == MFP_DIR_OUT)
+	if (is_out ^ gpio_desc[gpio].dir_inverted)
 		gpdr_lpm[bank] |= mask;
 	else
 		gpdr_lpm[bank] &= ~mask;
@@ -106,7 +107,7 @@ static int __mfp_config_gpio(unsigned gpio, unsigned long c)
 		return -EINVAL;
 	}
 
-	if ((c & MFP_LPM_CAN_WAKEUP) && (dir == MFP_DIR_OUT)) {
+	if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
 		pr_warning("%s: output GPIO%d unable to wakeup\n",
 				__func__, gpio);
 		return -EINVAL;
@@ -221,6 +222,12 @@ static void __init pxa25x_mfp_init(void)
 		gpio_desc[i].can_wakeup = 1;
 		gpio_desc[i].mask = GPIO_bit(i);
 	}
+
+	/* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
+	 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
+	 */
+	for (i = 86; i <= pxa_last_gpio; i++)
+		gpio_desc[i].dir_inverted = 1;
 }
 #else
 static inline void pxa25x_mfp_init(void) {}

arch/arm/mach-pxa/pxa25x.c

@@ -298,6 +298,14 @@ void __init pxa25x_init_irq(void)
 	pxa_init_gpio(85, pxa25x_set_wake);
 }
 
+#ifdef CONFIG_CPU_PXA26x
+void __init pxa26x_init_irq(void)
+{
+	pxa_init_irq(32, pxa25x_set_wake);
+	pxa_init_gpio(90, pxa25x_set_wake);
+}
+#endif
+
 static struct platform_device *pxa25x_devices[] __initdata = {
 	&pxa25x_device_udc,
 	&pxa_device_ffuart,