Initial import

1 files changed, 1203 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
new file mode 100644
index 000000000..a017359c1
--- /dev/null
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -0,0 +1,1203 @@
+/*
+ * GPIO Abstraction Layer
+ *
+ * Copyright 2006-2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+
+#if ANOMALY_05000311 || ANOMALY_05000323
+enum {
+	AWA_data = SYSCR,
+	AWA_data_clear = SYSCR,
+	AWA_data_set = SYSCR,
+	AWA_toggle = SYSCR,
+	AWA_maska = BFIN_UART_SCR,
+	AWA_maska_clear = BFIN_UART_SCR,
+	AWA_maska_set = BFIN_UART_SCR,
+	AWA_maska_toggle = BFIN_UART_SCR,
+	AWA_maskb = BFIN_UART_GCTL,
+	AWA_maskb_clear = BFIN_UART_GCTL,
+	AWA_maskb_set = BFIN_UART_GCTL,
+	AWA_maskb_toggle = BFIN_UART_GCTL,
+	AWA_dir = SPORT1_STAT,
+	AWA_polar = SPORT1_STAT,
+	AWA_edge = SPORT1_STAT,
+	AWA_both = SPORT1_STAT,
+#if ANOMALY_05000311
+	AWA_inen = TIMER_ENABLE,
+#elif ANOMALY_05000323
+	AWA_inen = DMA1_1_CONFIG,
+#endif
+};
+	/* Anomaly Workaround */
+#define AWA_DUMMY_READ(name) bfin_read16(AWA_ ## name)
+#else
+#define AWA_DUMMY_READ(...)  do { } while (0)
+#endif
+
+static struct gpio_port_t * const gpio_array[] = {
+#if defined(BF533_FAMILY) || defined(BF538_FAMILY)
+	(struct gpio_port_t *) FIO_FLAG_D,
+#elif defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
+	(struct gpio_port_t *) PORTFIO,
+	(struct gpio_port_t *) PORTGIO,
+	(struct gpio_port_t *) PORTHIO,
+#elif defined(BF561_FAMILY)
+	(struct gpio_port_t *) FIO0_FLAG_D,
+	(struct gpio_port_t *) FIO1_FLAG_D,
+	(struct gpio_port_t *) FIO2_FLAG_D,
+#else
+# error no gpio arrays defined
+#endif
+};
+
+#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
+static unsigned short * const port_fer[] = {
+	(unsigned short *) PORTF_FER,
+	(unsigned short *) PORTG_FER,
+	(unsigned short *) PORTH_FER,
+};
+
+# if !defined(BF537_FAMILY)
+static unsigned short * const port_mux[] = {
+	(unsigned short *) PORTF_MUX,
+	(unsigned short *) PORTG_MUX,
+	(unsigned short *) PORTH_MUX,
+};
+
+static const
+u8 pmux_offset[][16] = {
+#  if defined(CONFIG_BF52x)
+	{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 4, 6, 8, 8, 10, 10 }, /* PORTF */
+	{ 0, 0, 0, 0, 0, 2, 2, 4, 4, 6, 8, 10, 10, 10, 12, 12 }, /* PORTG */
+	{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 4, 4, 4, 4, 4 }, /* PORTH */
+#  elif defined(CONFIG_BF51x)
+	{ 0, 2, 2, 2, 2, 2, 2, 4, 6, 6, 6, 8, 8, 8, 8, 10 }, /* PORTF */
+	{ 0, 0, 0, 2, 4, 6, 6, 6, 8, 10, 10, 12, 14, 14, 14, 14 }, /* PORTG */
+	{ 0, 0, 0, 0, 2, 2, 4, 6, 10, 10, 10, 10, 10, 10, 10, 10 }, /* PORTH */
+#  endif
+};
+# endif
+
+#elif defined(BF538_FAMILY)
+static unsigned short * const port_fer[] = {
+	(unsigned short *) PORTCIO_FER,
+	(unsigned short *) PORTDIO_FER,
+	(unsigned short *) PORTEIO_FER,
+};
+#endif
+
+#define RESOURCE_LABEL_SIZE	16
+
+static struct str_ident {
+	char name[RESOURCE_LABEL_SIZE];
+} str_ident[MAX_RESOURCES];
+
+#if defined(CONFIG_PM)
+static struct gpio_port_s gpio_bank_saved[GPIO_BANK_NUM];
+# ifdef BF538_FAMILY
+static unsigned short port_fer_saved[3];
+# endif
+#endif
+
+static void gpio_error(unsigned gpio)
+{
+	printk(KERN_ERR "bfin-gpio: GPIO %d wasn't requested!\n", gpio);
+}
+
+static void set_label(unsigned short ident, const char *label)
+{
+	if (label) {
+		strncpy(str_ident[ident].name, label,
+			 RESOURCE_LABEL_SIZE);
+		str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
+	}
+}
+
+static char *get_label(unsigned short ident)
+{
+	return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
+}
+
+static int cmp_label(unsigned short ident, const char *label)
+{
+	if (label == NULL) {
+		dump_stack();
+		printk(KERN_ERR "Please provide none-null label\n");
+	}
+
+	if (label)
+		return strcmp(str_ident[ident].name, label);
+	else
+		return -EINVAL;
+}
+
+#define map_entry(m, i)      reserved_##m##_map[gpio_bank(i)]
+#define is_reserved(m, i, e) (map_entry(m, i) & gpio_bit(i))
+#define reserve(m, i)        (map_entry(m, i) |= gpio_bit(i))
+#define unreserve(m, i)      (map_entry(m, i) &= ~gpio_bit(i))
+#define DECLARE_RESERVED_MAP(m, c) static unsigned short reserved_##m##_map[c]
+
+DECLARE_RESERVED_MAP(gpio, GPIO_BANK_NUM);
+DECLARE_RESERVED_MAP(peri, DIV_ROUND_UP(MAX_RESOURCES, GPIO_BANKSIZE));
+DECLARE_RESERVED_MAP(gpio_irq, GPIO_BANK_NUM);
+
+inline int check_gpio(unsigned gpio)
+{
+	if (gpio >= MAX_BLACKFIN_GPIOS)
+		return -EINVAL;
+	return 0;
+}
+
+static void port_setup(unsigned gpio, unsigned short usage)
+{
+#if defined(BF538_FAMILY)
+	/*
+	 * BF538/9 Port C,D and E are special.
+	 * Inverted PORT_FER polarity on CDE and no PORF_FER on F
+	 * Regular PORT F GPIOs are handled here, CDE are exclusively
+	 * managed by GPIOLIB
+	 */
+
+	if (gpio < MAX_BLACKFIN_GPIOS || gpio >= MAX_RESOURCES)
+		return;
+
+	gpio -= MAX_BLACKFIN_GPIOS;
+
+	if (usage == GPIO_USAGE)
+		*port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
+	else
+		*port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+	SSYNC();
+	return;
+#endif
+
+	if (check_gpio(gpio))
+		return;
+
+#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
+	if (usage == GPIO_USAGE)
+		*port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+	else
+		*port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
+	SSYNC();
+#endif
+}
+
+#ifdef BF537_FAMILY
+static const s8 port_mux[] = {
+	[GPIO_PF0] = 3,
+	[GPIO_PF1] = 3,
+	[GPIO_PF2] = 4,
+	[GPIO_PF3] = 4,
+	[GPIO_PF4] = 5,
+	[GPIO_PF5] = 6,
+	[GPIO_PF6] = 7,
+	[GPIO_PF7] = 8,
+	[GPIO_PF8 ... GPIO_PF15] = -1,
+	[GPIO_PG0 ... GPIO_PG7] = -1,
+	[GPIO_PG8] = 9,
+	[GPIO_PG9] = 9,
+	[GPIO_PG10] = 10,
+	[GPIO_PG11] = 10,
+	[GPIO_PG12] = 10,
+	[GPIO_PG13] = 11,
+	[GPIO_PG14] = 11,
+	[GPIO_PG15] = 11,
+	[GPIO_PH0 ... GPIO_PH15] = -1,
+	[PORT_PJ0 ... PORT_PJ3] = -1,
+	[PORT_PJ4] = 1,
+	[PORT_PJ5] = 1,
+	[PORT_PJ6 ... PORT_PJ9] = -1,
+	[PORT_PJ10] = 0,
+	[PORT_PJ11] = 0,
+};
+
+static int portmux_group_check(unsigned short per)
+{
+	u16 ident = P_IDENT(per);
+	u16 function = P_FUNCT2MUX(per);
+	s8 offset = port_mux[ident];
+	u16 m, pmux, pfunc, mask;
+
+	if (offset < 0)
+		return 0;
+
+	pmux = bfin_read_PORT_MUX();
+	for (m = 0; m < ARRAY_SIZE(port_mux); ++m) {
+		if (m == ident)
+			continue;
+		if (port_mux[m] != offset)
+			continue;
+		if (!is_reserved(peri, m, 1))
+			continue;
+
+		if (offset == 1)
+			mask = 3;
+		else
+			mask = 1;
+
+		pfunc = (pmux >> offset) & mask;
+		if (pfunc != (function & mask)) {
+			pr_err("pin group conflict! request pin %d func %d conflict with pin %d func %d\n",
+				ident, function, m, pfunc);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static void portmux_setup(unsigned short per)
+{
+	u16 ident = P_IDENT(per);
+	u16 function = P_FUNCT2MUX(per);
+	s8 offset = port_mux[ident];
+	u16 pmux, mask;
+
+	if (offset == -1)
+		return;
+
+	pmux = bfin_read_PORT_MUX();
+	if (offset == 1)
+		mask = 3;
+	else
+		mask = 1;
+
+	pmux &= ~(mask << offset);
+	pmux |= ((function & mask) << offset);
+
+	bfin_write_PORT_MUX(pmux);
+}
+#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
+static int portmux_group_check(unsigned short per)
+{
+	u16 ident = P_IDENT(per);
+	u16 function = P_FUNCT2MUX(per);
+	u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
+	u16 pin, gpiopin, pfunc;
+
+	for (pin = 0; pin < GPIO_BANKSIZE; ++pin) {
+		if (offset != pmux_offset[gpio_bank(ident)][pin])
+			continue;
+
+		gpiopin = gpio_bank(ident) * GPIO_BANKSIZE + pin;
+		if (gpiopin == ident)
+			continue;
+		if (!is_reserved(peri, gpiopin, 1))
+			continue;
+
+		pfunc = *port_mux[gpio_bank(ident)];
+		pfunc = (pfunc >> offset) & 3;
+		if (pfunc != function) {
+			pr_err("pin group conflict! request pin %d func %d conflict with pin %d func %d\n",
+				ident, function, gpiopin, pfunc);
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+inline void portmux_setup(unsigned short per)
+{
+	u16 ident = P_IDENT(per);
+	u16 function = P_FUNCT2MUX(per);
+	u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
+	u16 pmux;
+
+	pmux = *port_mux[gpio_bank(ident)];
+	if  (((pmux >> offset) & 3) == function)
+		return;
+	pmux &= ~(3 << offset);
+	pmux |= (function & 3) << offset;
+	*port_mux[gpio_bank(ident)] = pmux;
+	SSYNC();
+}
+#else
+# define portmux_setup(...)  do { } while (0)
+static int portmux_group_check(unsigned short per)
+{
+	return 0;
+}
+#endif
+
+/***********************************************************
+*
+* FUNCTIONS: Blackfin General Purpose Ports Access Functions
+*
+* INPUTS/OUTPUTS:
+* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
+*
+*
+* DESCRIPTION: These functions abstract direct register access
+*              to Blackfin processor General Purpose
+*              Ports Regsiters
+*
+* CAUTION: These functions do not belong to the GPIO Driver API
+*************************************************************
+* MODIFICATION HISTORY :
+**************************************************************/
+
+/* Set a specific bit */
+
+#define SET_GPIO(name) \
+void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
+{ \
+	unsigned long flags; \
+	flags = hard_local_irq_save(); \
+	if (arg) \
+		gpio_array[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
+	else \
+		gpio_array[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
+	AWA_DUMMY_READ(name); \
+	hard_local_irq_restore(flags); \
+} \
+EXPORT_SYMBOL(set_gpio_ ## name);
+
+SET_GPIO(dir)   /* set_gpio_dir() */
+SET_GPIO(inen)  /* set_gpio_inen() */
+SET_GPIO(polar) /* set_gpio_polar() */
+SET_GPIO(edge)  /* set_gpio_edge() */
+SET_GPIO(both)  /* set_gpio_both() */
+
+
+#define SET_GPIO_SC(name) \
+void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
+{ \
+	unsigned long flags; \
+	if (ANOMALY_05000311 || ANOMALY_05000323) \
+		flags = hard_local_irq_save(); \
+	if (arg) \
+		gpio_array[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
+	else \
+		gpio_array[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
+	if (ANOMALY_05000311 || ANOMALY_05000323) { \
+		AWA_DUMMY_READ(name); \
+		hard_local_irq_restore(flags); \
+	} \
+} \
+EXPORT_SYMBOL(set_gpio_ ## name);
+
+SET_GPIO_SC(maska)
+SET_GPIO_SC(maskb)
+SET_GPIO_SC(data)
+
+void set_gpio_toggle(unsigned gpio)
+{
+	unsigned long flags;
+	if (ANOMALY_05000311 || ANOMALY_05000323)
+		flags = hard_local_irq_save();
+	gpio_array[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
+	if (ANOMALY_05000311 || ANOMALY_05000323) {
+		AWA_DUMMY_READ(toggle);
+		hard_local_irq_restore(flags);
+	}
+}
+EXPORT_SYMBOL(set_gpio_toggle);
+
+
+/*Set current PORT date (16-bit word)*/
+
+#define SET_GPIO_P(name) \
+void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
+{ \
+	unsigned long flags; \
+	if (ANOMALY_05000311 || ANOMALY_05000323) \
+		flags = hard_local_irq_save(); \
+	gpio_array[gpio_bank(gpio)]->name = arg; \
+	if (ANOMALY_05000311 || ANOMALY_05000323) { \
+		AWA_DUMMY_READ(name); \
+		hard_local_irq_restore(flags); \
+	} \
+} \
+EXPORT_SYMBOL(set_gpiop_ ## name);
+
+SET_GPIO_P(data)
+SET_GPIO_P(dir)
+SET_GPIO_P(inen)
+SET_GPIO_P(polar)
+SET_GPIO_P(edge)
+SET_GPIO_P(both)
+SET_GPIO_P(maska)
+SET_GPIO_P(maskb)
+
+/* Get a specific bit */
+#define GET_GPIO(name) \
+unsigned short get_gpio_ ## name(unsigned gpio) \
+{ \
+	unsigned long flags; \
+	unsigned short ret; \
+	if (ANOMALY_05000311 || ANOMALY_05000323) \
+		flags = hard_local_irq_save(); \
+	ret = 0x01 & (gpio_array[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
+	if (ANOMALY_05000311 || ANOMALY_05000323) { \
+		AWA_DUMMY_READ(name); \
+		hard_local_irq_restore(flags); \
+	} \
+	return ret; \
+} \
+EXPORT_SYMBOL(get_gpio_ ## name);
+
+GET_GPIO(data)
+GET_GPIO(dir)
+GET_GPIO(inen)
+GET_GPIO(polar)
+GET_GPIO(edge)
+GET_GPIO(both)
+GET_GPIO(maska)
+GET_GPIO(maskb)
+
+/*Get current PORT date (16-bit word)*/
+
+#define GET_GPIO_P(name) \
+unsigned short get_gpiop_ ## name(unsigned gpio) \
+{ \
+	unsigned long flags; \
+	unsigned short ret; \
+	if (ANOMALY_05000311 || ANOMALY_05000323) \
+		flags = hard_local_irq_save(); \
+	ret = (gpio_array[gpio_bank(gpio)]->name); \
+	if (ANOMALY_05000311 || ANOMALY_05000323) { \
+		AWA_DUMMY_READ(name); \
+		hard_local_irq_restore(flags); \
+	} \
+	return ret; \
+} \
+EXPORT_SYMBOL(get_gpiop_ ## name);
+
+GET_GPIO_P(data)
+GET_GPIO_P(dir)
+GET_GPIO_P(inen)
+GET_GPIO_P(polar)
+GET_GPIO_P(edge)
+GET_GPIO_P(both)
+GET_GPIO_P(maska)
+GET_GPIO_P(maskb)
+
+
+#ifdef CONFIG_PM
+DECLARE_RESERVED_MAP(wakeup, GPIO_BANK_NUM);
+
+static const unsigned int sic_iwr_irqs[] = {
+#if defined(BF533_FAMILY)
+	IRQ_PROG_INTB
+#elif defined(BF537_FAMILY)
+	IRQ_PF_INTB_WATCH, IRQ_PORTG_INTB, IRQ_PH_INTB_MAC_TX
+#elif defined(BF538_FAMILY)
+	IRQ_PORTF_INTB
+#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
+	IRQ_PORTF_INTB, IRQ_PORTG_INTB, IRQ_PORTH_INTB
+#elif defined(BF561_FAMILY)
+	IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB
+#else
+# error no SIC_IWR defined
+#endif
+};
+
+/***********************************************************
+*
+* FUNCTIONS: Blackfin PM Setup API
+*
+* INPUTS/OUTPUTS:
+* gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
+* type -
+*	PM_WAKE_RISING
+*	PM_WAKE_FALLING
+*	PM_WAKE_HIGH
+*	PM_WAKE_LOW
+*	PM_WAKE_BOTH_EDGES
+*
+* DESCRIPTION: Blackfin PM Driver API
+*
+* CAUTION:
+*************************************************************
+* MODIFICATION HISTORY :
+**************************************************************/
+int bfin_gpio_pm_wakeup_ctrl(unsigned gpio, unsigned ctrl)
+{
+	unsigned long flags;
+
+	if (check_gpio(gpio) < 0)
+		return -EINVAL;
+
+	flags = hard_local_irq_save();
+	if (ctrl)
+		reserve(wakeup, gpio);
+	else
+		unreserve(wakeup, gpio);
+
+	set_gpio_maskb(gpio, ctrl);
+	hard_local_irq_restore(flags);
+
+	return 0;
+}
+
+int bfin_gpio_pm_standby_ctrl(unsigned ctrl)
+{
+	u16 bank, mask, i;
+
+	for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
+		mask = map_entry(wakeup, i);
+		bank = gpio_bank(i);
+
+		if (mask)
+			bfin_internal_set_wake(sic_iwr_irqs[bank], ctrl);
+	}
+	return 0;
+}
+
+void bfin_gpio_pm_hibernate_suspend(void)
+{
+	int i, bank;
+
+#ifdef BF538_FAMILY
+	for (i = 0; i < ARRAY_SIZE(port_fer_saved); ++i)
+		port_fer_saved[i] = *port_fer[i];
+#endif
+
+	for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
+		bank = gpio_bank(i);
+
+#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
+		gpio_bank_saved[bank].fer = *port_fer[bank];
+#if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
+		gpio_bank_saved[bank].mux = *port_mux[bank];
+#else
+		if (bank == 0)
+			gpio_bank_saved[bank].mux = bfin_read_PORT_MUX();
+#endif
+#endif
+		gpio_bank_saved[bank].data  = gpio_array[bank]->data;
+		gpio_bank_saved[bank].inen  = gpio_array[bank]->inen;
+		gpio_bank_saved[bank].polar = gpio_array[bank]->polar;
+		gpio_bank_saved[bank].dir   = gpio_array[bank]->dir;
+		gpio_bank_saved[bank].edge  = gpio_array[bank]->edge;
+		gpio_bank_saved[bank].both  = gpio_array[bank]->both;
+		gpio_bank_saved[bank].maska = gpio_array[bank]->maska;
+	}
+
+#ifdef BFIN_SPECIAL_GPIO_BANKS
+	bfin_special_gpio_pm_hibernate_suspend();
+#endif
+
+	AWA_DUMMY_READ(maska);
+}
+
+void bfin_gpio_pm_hibernate_restore(void)
+{
+	int i, bank;
+
+#ifdef BF538_FAMILY
+	for (i = 0; i < ARRAY_SIZE(port_fer_saved); ++i)
+		*port_fer[i] = port_fer_saved[i];
+#endif
+
+	for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
+		bank = gpio_bank(i);
+
+#if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x)
+#if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
+		*port_mux[bank] = gpio_bank_saved[bank].mux;
+#else
+		if (bank == 0)
+			bfin_write_PORT_MUX(gpio_bank_saved[bank].mux);
+#endif
+		*port_fer[bank] = gpio_bank_saved[bank].fer;
+#endif
+		gpio_array[bank]->inen  = gpio_bank_saved[bank].inen;
+		gpio_array[bank]->data_set = gpio_bank_saved[bank].data
+						& gpio_bank_saved[bank].dir;
+		gpio_array[bank]->dir   = gpio_bank_saved[bank].dir;
+		gpio_array[bank]->polar = gpio_bank_saved[bank].polar;
+		gpio_array[bank]->edge  = gpio_bank_saved[bank].edge;
+		gpio_array[bank]->both  = gpio_bank_saved[bank].both;
+		gpio_array[bank]->maska = gpio_bank_saved[bank].maska;
+	}
+
+#ifdef BFIN_SPECIAL_GPIO_BANKS
+	bfin_special_gpio_pm_hibernate_restore();
+#endif
+
+	AWA_DUMMY_READ(maska);
+}
+
+
+#endif
+
+/***********************************************************
+*
+* FUNCTIONS:	Blackfin Peripheral Resource Allocation
+*		and PortMux Setup
+*
+* INPUTS/OUTPUTS:
+* per	Peripheral Identifier
+* label	String
+*
+* DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
+*
+* CAUTION:
+*************************************************************
+* MODIFICATION HISTORY :
+**************************************************************/
+
+int peripheral_request(unsigned short per, const char *label)
+{
+	unsigned long flags;
+	unsigned short ident = P_IDENT(per);
+
+	/*
+	 * Don't cares are pins with only one dedicated function
+	 */
+
+	if (per & P_DONTCARE)
+		return 0;
+
+	if (!(per & P_DEFINED))
+		return -ENODEV;
+
+	BUG_ON(ident >= MAX_RESOURCES);
+
+	flags = hard_local_irq_save();
+
+	/* If a pin can be muxed as either GPIO or peripheral, make
+	 * sure it is not already a GPIO pin when we request it.
+	 */
+	if (unlikely(!check_gpio(ident) && is_reserved(gpio, ident, 1))) {
+		if (system_state == SYSTEM_BOOTING)
+			dump_stack();
+		printk(KERN_ERR
+		       "%s: Peripheral %d is already reserved as GPIO by %s !\n",
+		       __func__, ident, get_label(ident));
+		hard_local_irq_restore(flags);
+		return -EBUSY;
+	}
+
+	if (unlikely(is_reserved(peri, ident, 1))) {
+
+		/*
+		 * Pin functions like AMC address strobes my
+		 * be requested and used by several drivers
+		 */
+
+		if (!(per & P_MAYSHARE)) {
+			/*
+			 * Allow that the identical pin function can
+			 * be requested from the same driver twice
+			 */
+
+			if (cmp_label(ident, label) == 0)
+				goto anyway;
+
+			if (system_state == SYSTEM_BOOTING)
+				dump_stack();
+			printk(KERN_ERR
+			       "%s: Peripheral %d function %d is already reserved by %s !\n",
+			       __func__, ident, P_FUNCT2MUX(per), get_label(ident));
+			hard_local_irq_restore(flags);
+			return -EBUSY;
+		}
+	}
+
+	if (unlikely(portmux_group_check(per))) {
+		hard_local_irq_restore(flags);
+		return -EBUSY;
+	}
+ anyway:
+	reserve(peri, ident);
+
+	portmux_setup(per);
+	port_setup(ident, PERIPHERAL_USAGE);
+
+	hard_local_irq_restore(flags);
+	set_label(ident, label);
+
+	return 0;
+}
+EXPORT_SYMBOL(peripheral_request);
+
+int peripheral_request_list(const unsigned short per[], const char *label)
+{
+	u16 cnt;
+	int ret;
+
+	for (cnt = 0; per[cnt] != 0; cnt++) {
+
+		ret = peripheral_request(per[cnt], label);
+
+		if (ret < 0) {
+			for ( ; cnt > 0; cnt--)
+				peripheral_free(per[cnt - 1]);
+
+			return ret;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(peripheral_request_list);
+
+void peripheral_free(unsigned short per)
+{
+	unsigned long flags;
+	unsigned short ident = P_IDENT(per);
+
+	if (per & P_DONTCARE)
+		return;
+
+	if (!(per & P_DEFINED))
+		return;
+
+	flags = hard_local_irq_save();
+
+	if (unlikely(!is_reserved(peri, ident, 0))) {
+		hard_local_irq_restore(flags);
+		return;
+	}
+
+	if (!(per & P_MAYSHARE))
+		port_setup(ident, GPIO_USAGE);
+
+	unreserve(peri, ident);
+
+	set_label(ident, "free");
+
+	hard_local_irq_restore(flags);
+}
+EXPORT_SYMBOL(peripheral_free);
+
+void peripheral_free_list(const unsigned short per[])
+{
+	u16 cnt;
+	for (cnt = 0; per[cnt] != 0; cnt++)
+		peripheral_free(per[cnt]);
+}
+EXPORT_SYMBOL(peripheral_free_list);
+
+/***********************************************************
+*
+* FUNCTIONS: Blackfin GPIO Driver
+*
+* INPUTS/OUTPUTS:
+* gpio	PIO Number between 0 and MAX_BLACKFIN_GPIOS
+* label	String
+*
+* DESCRIPTION: Blackfin GPIO Driver API
+*
+* CAUTION:
+*************************************************************
+* MODIFICATION HISTORY :
+**************************************************************/
+
+int bfin_gpio_request(unsigned gpio, const char *label)
+{
+	unsigned long flags;
+
+	if (check_gpio(gpio) < 0)
+		return -EINVAL;
+
+	flags = hard_local_irq_save();
+
+	/*
+	 * Allow that the identical GPIO can
+	 * be requested from the same driver twice
+	 * Do nothing and return -
+	 */
+
+	if (cmp_label(gpio, label) == 0) {
+		hard_local_irq_restore(flags);
+		return 0;
+	}
+
+	if (unlikely(is_reserved(gpio, gpio, 1))) {
+		if (system_state == SYSTEM_BOOTING)
+			dump_stack();
+		printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
+		       gpio, get_label(gpio));
+		hard_local_irq_restore(flags);
+		return -EBUSY;
+	}
+	if (unlikely(is_reserved(peri, gpio, 1))) {
+		if (system_state == SYSTEM_BOOTING)
+			dump_stack();
+		printk(KERN_ERR
+		       "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
+		       gpio, get_label(gpio));
+		hard_local_irq_restore(flags);
+		return -EBUSY;
+	}
+	if (unlikely(is_reserved(gpio_irq, gpio, 1))) {
+		printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved as gpio-irq!"
+		       " (Documentation/blackfin/bfin-gpio-notes.txt)\n", gpio);
+	} else {	/* Reset POLAR setting when acquiring a gpio for the first time */
+		set_gpio_polar(gpio, 0);
+	}
+
+	reserve(gpio, gpio);
+	set_label(gpio, label);
+
+	hard_local_irq_restore(flags);
+
+	port_setup(gpio, GPIO_USAGE);
+
+	return 0;
+}
+EXPORT_SYMBOL(bfin_gpio_request);
+
+void bfin_gpio_free(unsigned gpio)
+{
+	unsigned long flags;
+
+	if (check_gpio(gpio) < 0)
+		return;
+
+	might_sleep();
+
+	flags = hard_local_irq_save();
+
+	if (unlikely(!is_reserved(gpio, gpio, 0))) {
+		if (system_state == SYSTEM_BOOTING)
+			dump_stack();
+		gpio_error(gpio);
+		hard_local_irq_restore(flags);
+		return;
+	}
+
+	unreserve(gpio, gpio);
+
+	set_label(gpio, "free");
+
+	hard_local_irq_restore(flags);
+}
+EXPORT_SYMBOL(bfin_gpio_free);
+
+#ifdef BFIN_SPECIAL_GPIO_BANKS
+DECLARE_RESERVED_MAP(special_gpio, gpio_bank(MAX_RESOURCES));
+
+int bfin_special_gpio_request(unsigned gpio, const char *label)
+{
+	unsigned long flags;
+
+	flags = hard_local_irq_save();
+
+	/*
+	 * Allow that the identical GPIO can
+	 * be requested from the same driver twice
+	 * Do nothing and return -
+	 */
+
+	if (cmp_label(gpio, label) == 0) {
+		hard_local_irq_restore(flags);
+		return 0;
+	}
+
+	if (unlikely(is_reserved(special_gpio, gpio, 1))) {
+		hard_local_irq_restore(flags);
+		printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
+		       gpio, get_label(gpio));
+
+		return -EBUSY;
+	}
+	if (unlikely(is_reserved(peri, gpio, 1))) {
+		hard_local_irq_restore(flags);
+		printk(KERN_ERR
+		       "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
+		       gpio, get_label(gpio));
+
+		return -EBUSY;
+	}
+
+	reserve(special_gpio, gpio);
+	reserve(peri, gpio);
+
+	set_label(gpio, label);
+	hard_local_irq_restore(flags);
+	port_setup(gpio, GPIO_USAGE);
+
+	return 0;
+}
+EXPORT_SYMBOL(bfin_special_gpio_request);
+
+void bfin_special_gpio_free(unsigned gpio)
+{
+	unsigned long flags;
+
+	might_sleep();
+
+	flags = hard_local_irq_save();
+
+	if (unlikely(!is_reserved(special_gpio, gpio, 0))) {
+		gpio_error(gpio);
+		hard_local_irq_restore(flags);
+		return;
+	}
+
+	unreserve(special_gpio, gpio);
+	unreserve(peri, gpio);
+	set_label(gpio, "free");
+	hard_local_irq_restore(flags);
+}
+EXPORT_SYMBOL(bfin_special_gpio_free);
+#endif
+
+
+int bfin_gpio_irq_request(unsigned gpio, const char *label)
+{
+	unsigned long flags;
+
+	if (check_gpio(gpio) < 0)
+		return -EINVAL;
+
+	flags = hard_local_irq_save();
+
+	if (unlikely(is_reserved(peri, gpio, 1))) {
+		if (system_state == SYSTEM_BOOTING)
+			dump_stack();
+		printk(KERN_ERR
+		       "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
+		       gpio, get_label(gpio));
+		hard_local_irq_restore(flags);
+		return -EBUSY;
+	}
+	if (unlikely(is_reserved(gpio, gpio, 1)))
+		printk(KERN_NOTICE "bfin-gpio: GPIO %d is already reserved by %s! "
+		       "(Documentation/blackfin/bfin-gpio-notes.txt)\n",
+		       gpio, get_label(gpio));
+
+	reserve(gpio_irq, gpio);
+	set_label(gpio, label);
+
+	hard_local_irq_restore(flags);
+
+	port_setup(gpio, GPIO_USAGE);
+
+	return 0;
+}
+
+void bfin_gpio_irq_free(unsigned gpio)
+{
+	unsigned long flags;
+
+	if (check_gpio(gpio) < 0)
+		return;
+
+	flags = hard_local_irq_save();
+
+	if (unlikely(!is_reserved(gpio_irq, gpio, 0))) {
+		if (system_state == SYSTEM_BOOTING)
+			dump_stack();
+		gpio_error(gpio);
+		hard_local_irq_restore(flags);
+		return;
+	}
+
+	unreserve(gpio_irq, gpio);
+
+	set_label(gpio, "free");
+
+	hard_local_irq_restore(flags);
+}
+
+static inline void __bfin_gpio_direction_input(unsigned gpio)
+{
+	gpio_array[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
+	gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
+}
+
+int bfin_gpio_direction_input(unsigned gpio)
+{
+	unsigned long flags;
+
+	if (unlikely(!is_reserved(gpio, gpio, 0))) {
+		gpio_error(gpio);
+		return -EINVAL;
+	}
+
+	flags = hard_local_irq_save();
+	__bfin_gpio_direction_input(gpio);
+	AWA_DUMMY_READ(inen);
+	hard_local_irq_restore(flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(bfin_gpio_direction_input);
+
+void bfin_gpio_irq_prepare(unsigned gpio)
+{
+	port_setup(gpio, GPIO_USAGE);
+}
+
+void bfin_gpio_set_value(unsigned gpio, int arg)
+{
+	if (arg)
+		gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
+	else
+		gpio_array[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
+}
+EXPORT_SYMBOL(bfin_gpio_set_value);
+
+int bfin_gpio_direction_output(unsigned gpio, int value)
+{
+	unsigned long flags;
+
+	if (unlikely(!is_reserved(gpio, gpio, 0))) {
+		gpio_error(gpio);
+		return -EINVAL;
+	}
+
+	flags = hard_local_irq_save();
+
+	gpio_array[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
+	gpio_set_value(gpio, value);
+	gpio_array[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
+
+	AWA_DUMMY_READ(dir);
+	hard_local_irq_restore(flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(bfin_gpio_direction_output);
+
+int bfin_gpio_get_value(unsigned gpio)
+{
+	unsigned long flags;
+
+	if (unlikely(get_gpio_edge(gpio))) {
+		int ret;
+		flags = hard_local_irq_save();
+		set_gpio_edge(gpio, 0);
+		ret = get_gpio_data(gpio);
+		set_gpio_edge(gpio, 1);
+		hard_local_irq_restore(flags);
+		return ret;
+	} else
+		return get_gpio_data(gpio);
+}
+EXPORT_SYMBOL(bfin_gpio_get_value);
+
+/* If we are booting from SPI and our board lacks a strong enough pull up,
+ * the core can reset and execute the bootrom faster than the resistor can
+ * pull the signal logically high.  To work around this (common) error in
+ * board design, we explicitly set the pin back to GPIO mode, force /CS
+ * high, and wait for the electrons to do their thing.
+ *
+ * This function only makes sense to be called from reset code, but it
+ * lives here as we need to force all the GPIO states w/out going through
+ * BUG() checks and such.
+ */
+void bfin_reset_boot_spi_cs(unsigned short pin)
+{
+	unsigned short gpio = P_IDENT(pin);
+	port_setup(gpio, GPIO_USAGE);
+	gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
+	AWA_DUMMY_READ(data_set);
+	udelay(1);
+}
+
+#if defined(CONFIG_PROC_FS)
+static int gpio_proc_show(struct seq_file *m, void *v)
+{
+	int c, irq, gpio;
+
+	for (c = 0; c < MAX_RESOURCES; c++) {
+		irq = is_reserved(gpio_irq, c, 1);
+		gpio = is_reserved(gpio, c, 1);
+		if (!check_gpio(c) && (gpio || irq))
+			seq_printf(m, "GPIO_%d: \t%s%s \t\tGPIO %s\n", c,
+				 get_label(c), (gpio && irq) ? " *" : "",
+				 get_gpio_dir(c) ? "OUTPUT" : "INPUT");
+		else if (is_reserved(peri, c, 1))
+			seq_printf(m, "GPIO_%d: \t%s \t\tPeripheral\n", c, get_label(c));
+		else
+			continue;
+	}
+
+	return 0;
+}
+
+static int gpio_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, gpio_proc_show, NULL);
+}
+
+static const struct file_operations gpio_proc_ops = {
+	.open		= gpio_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static __init int gpio_register_proc(void)
+{
+	struct proc_dir_entry *proc_gpio;
+
+	proc_gpio = proc_create("gpio", 0, NULL, &gpio_proc_ops);
+	return proc_gpio == NULL;
+}
+__initcall(gpio_register_proc);
+#endif
+
+#ifdef CONFIG_GPIOLIB
+static int bfin_gpiolib_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+	return bfin_gpio_direction_input(gpio);
+}
+
+static int bfin_gpiolib_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
+{
+	return bfin_gpio_direction_output(gpio, level);
+}
+
+static int bfin_gpiolib_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+	return bfin_gpio_get_value(gpio);
+}
+
+static void bfin_gpiolib_set_value(struct gpio_chip *chip, unsigned gpio, int value)
+{
+	return bfin_gpio_set_value(gpio, value);
+}
+
+static int bfin_gpiolib_gpio_request(struct gpio_chip *chip, unsigned gpio)
+{
+	return bfin_gpio_request(gpio, chip->label);
+}
+
+static void bfin_gpiolib_gpio_free(struct gpio_chip *chip, unsigned gpio)
+{
+	return bfin_gpio_free(gpio);
+}
+
+static int bfin_gpiolib_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
+{
+	return gpio + GPIO_IRQ_BASE;
+}
+
+static struct gpio_chip bfin_chip = {
+	.label			= "BFIN-GPIO",
+	.direction_input	= bfin_gpiolib_direction_input,
+	.get			= bfin_gpiolib_get_value,
+	.direction_output	= bfin_gpiolib_direction_output,
+	.set			= bfin_gpiolib_set_value,
+	.request		= bfin_gpiolib_gpio_request,
+	.free			= bfin_gpiolib_gpio_free,
+	.to_irq			= bfin_gpiolib_gpio_to_irq,
+	.base			= 0,
+	.ngpio			= MAX_BLACKFIN_GPIOS,
+};
+
+static int __init bfin_gpiolib_setup(void)
+{
+	return gpiochip_add(&bfin_chip);
+}
+arch_initcall(bfin_gpiolib_setup);
+#endif