Blackfin arch: gpio pinmux and resource allocation API required by BF537 on chip ethernet mac driver

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

1 files changed, 241 insertions, 31 deletions

diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
index bafcfa52142b..9f3094800248 100644
--- a/arch/blackfin/kernel/bfin_gpio.c
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -84,6 +84,7 @@
 #include <linux/err.h>
 #include <asm/blackfin.h>
 #include <asm/gpio.h>
+#include <asm/portmux.h>
 #include <linux/irq.h>
 
 #ifdef BF533_FAMILY
@@ -115,7 +116,11 @@ static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
 };
 #endif
 
-static unsigned short reserved_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
+static unsigned short reserved_peri_map[gpio_bank(MAX_BLACKFIN_GPIOS + 16)];
+char *str_ident = NULL;
+
+#define RESOURCE_LABEL_SIZE 16
 
 #ifdef CONFIG_PM
 static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
@@ -143,13 +148,39 @@ inline int check_gpio(unsigned short gpio)
         return 0;
 }
 
+static void set_label(unsigned short ident, const char *label)
+{
+
+        if (label && str_ident) {
+                strncpy(str_ident + ident * RESOURCE_LABEL_SIZE, label,
+                         RESOURCE_LABEL_SIZE);
+                str_ident[ident * RESOURCE_LABEL_SIZE +
+                         RESOURCE_LABEL_SIZE - 1] = 0;
+        }
+}
+
+static char *get_label(unsigned short ident)
+{
+        if (!str_ident)
+                return "UNKNOWN";
+
+        return (str_ident[ident * RESOURCE_LABEL_SIZE] ?
+                (str_ident + ident * RESOURCE_LABEL_SIZE) : "UNKNOWN");
+}
+
+static int cmp_label(unsigned short ident, const char *label)
+{
+        if (label && str_ident)
+                return strncmp(str_ident + ident * RESOURCE_LABEL_SIZE,
+                                 label, strlen(label));
+        else
+                return -EINVAL;
+}
+
 #ifdef BF537_FAMILY
 static void port_setup(unsigned short gpio, unsigned short usage)
 {
         if (usage == GPIO_USAGE) {
-                if (*port_fer[gpio_bank(gpio)] & gpio_bit(gpio))
-                        printk(KERN_WARNING "bfin-gpio: Possible Conflict with Peripheral "
-                               "usage and GPIO %d detected!\n", gpio);
                 *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
         } else
                 *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
@@ -159,6 +190,56 @@ static void port_setup(unsigned short gpio, unsigned short usage)
 # define port_setup(...)  do { } while (0)
 #endif
 
+#ifdef BF537_FAMILY
+
+#define PMUX_LUT_RES            0
+#define PMUX_LUT_OFFSET         1
+#define PMUX_LUT_ENTRIES        41
+#define PMUX_LUT_SIZE           2
+
+static unsigned short port_mux_lut[PMUX_LUT_ENTRIES][PMUX_LUT_SIZE] = {
+        {P_PPI0_D13, 11}, {P_PPI0_D14, 11}, {P_PPI0_D15, 11},
+        {P_SPORT1_TFS, 11}, {P_SPORT1_TSCLK, 11}, {P_SPORT1_DTPRI, 11},
+        {P_PPI0_D10, 10}, {P_PPI0_D11, 10}, {P_PPI0_D12, 10},
+        {P_SPORT1_RSCLK, 10}, {P_SPORT1_RFS, 10}, {P_SPORT1_DRPRI, 10},
+        {P_PPI0_D8, 9}, {P_PPI0_D9, 9}, {P_SPORT1_DRSEC, 9},
+        {P_SPORT1_DTSEC, 9}, {P_TMR2, 8}, {P_PPI0_FS3, 8}, {P_TMR3, 7},
+        {P_SPI0_SSEL4, 7}, {P_TMR4, 6}, {P_SPI0_SSEL5, 6}, {P_TMR5, 5},
+        {P_SPI0_SSEL6, 5}, {P_UART1_RX, 4}, {P_UART1_TX, 4}, {P_TMR6, 4},
+        {P_TMR7, 4}, {P_UART0_RX, 3}, {P_UART0_TX, 3}, {P_DMAR0, 3},
+        {P_DMAR1, 3}, {P_SPORT0_DTSEC, 1}, {P_SPORT0_DRSEC, 1},
+        {P_CAN0_RX, 1}, {P_CAN0_TX, 1}, {P_SPI0_SSEL7, 1},
+        {P_SPORT0_TFS, 0}, {P_SPORT0_DTPRI, 0}, {P_SPI0_SSEL2, 0},
+        {P_SPI0_SSEL3, 0}
+};
+
+static void portmux_setup(unsigned short per, unsigned short function)
+{
+        u16 y, muxreg, offset;
+
+        for (y = 0; y < PMUX_LUT_ENTRIES; y++) {
+                if (port_mux_lut[y][PMUX_LUT_RES] == per) {
+
+                        /* SET PORTMUX REG */
+
+                        offset = port_mux_lut[y][PMUX_LUT_OFFSET];
+                        muxreg = bfin_read_PORT_MUX();
+
+                        if (offset != 1) {
+                                muxreg &= ~(1 << offset);
+                        } else {
+                                muxreg &= ~(3 << 1);
+                        }
+
+                        muxreg |= (function << offset);
+                        bfin_write_PORT_MUX(muxreg);
+                }
+        }
+}
+
+#else
+# define portmux_setup(...)  do { } while (0)
+#endif
 
 static void default_gpio(unsigned short gpio)
 {
@@ -179,22 +260,15 @@ static void default_gpio(unsigned short gpio)
 
 static int __init bfin_gpio_init(void)
 {
-        int i;
-
-        printk(KERN_INFO "Blackfin GPIO Controller\n");
 
-        for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE)
-                reserved_map[gpio_bank(i)] = 0;
+        str_ident = kzalloc(RESOURCE_LABEL_SIZE * 256, GFP_KERNEL);
+        if (!str_ident)
+                return -ENOMEM;
 
-#if defined(BF537_FAMILY) && (defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
-# if defined(CONFIG_BFIN_MAC_RMII)
-        reserved_map[gpio_bank(PORT_H)] = 0xC373;
-# else
-        reserved_map[gpio_bank(PORT_H)] = 0xFFFF;
-# endif
-#endif
+        printk(KERN_INFO "Blackfin GPIO Controller\n");
 
         return 0;
+
 }
 
 arch_initcall(bfin_gpio_init);
@@ -223,7 +297,7 @@ arch_initcall(bfin_gpio_init);
 void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
 { \
         unsigned long flags; \
-        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
+        BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
         local_irq_save(flags); \
         if (arg) \
                 gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
@@ -243,7 +317,7 @@ SET_GPIO(both)
 #define SET_GPIO_SC(name) \
 void set_gpio_ ## name(unsigned short gpio, unsigned short arg) \
 { \
-        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
+        BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))); \
         if (arg) \
                 gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
         else \
@@ -258,7 +332,7 @@ SET_GPIO_SC(maskb)
 void set_gpio_data(unsigned short gpio, unsigned short arg)
 {
         unsigned long flags;
-        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
         local_irq_save(flags);
         if (arg)
                 gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
@@ -277,7 +351,7 @@ SET_GPIO_SC(data)
 void set_gpio_toggle(unsigned short gpio)
 {
         unsigned long flags;
-        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
         local_irq_save(flags);
         gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
         bfin_read_CHIPID();
@@ -286,7 +360,7 @@ void set_gpio_toggle(unsigned short gpio)
 #else
 void set_gpio_toggle(unsigned short gpio)
 {
-        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
         gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
 }
 #endif
@@ -350,7 +424,7 @@ unsigned short get_gpio_data(unsigned short gpio)
 {
         unsigned long flags;
         unsigned short ret;
-        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
         local_irq_save(flags);
         ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->data >> gpio_sub_n(gpio));
         bfin_read_CHIPID();
@@ -494,13 +568,14 @@ u32 gpio_pm_setup(void)
                         gpio_bank_saved[bank].dir   = gpio_bankb[bank]->dir;
                         gpio_bank_saved[bank].edge  = gpio_bankb[bank]->edge;
                         gpio_bank_saved[bank].both  = gpio_bankb[bank]->both;
-                        gpio_bank_saved[bank].reserved = reserved_map[bank];
+                        gpio_bank_saved[bank].reserved =
+                                                reserved_gpio_map[bank];
 
                         gpio = i;
 
                         while (mask) {
                                 if (mask & 1) {
-                                        reserved_map[gpio_bank(gpio)] |=
+                                        reserved_gpio_map[gpio_bank(gpio)] |=
                                                         gpio_bit(gpio);
                                         bfin_gpio_wakeup_type(gpio,
                                                 wakeup_flags_map[gpio]);
@@ -540,7 +615,8 @@ void gpio_pm_restore(void)
                         gpio_bankb[bank]->edge  = gpio_bank_saved[bank].edge;
                         gpio_bankb[bank]->both  = gpio_bank_saved[bank].both;
 
-                        reserved_map[bank] = gpio_bank_saved[bank].reserved;
+                        reserved_gpio_map[bank] =
+                                        gpio_bank_saved[bank].reserved;
 
                 }
 
@@ -550,6 +626,140 @@ void gpio_pm_restore(void)
 
 #endif
 
+
+
+
+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;
+
+        if (check_gpio(ident) < 0)
+                return -EINVAL;
+
+        local_irq_save(flags);
+
+        if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
+                printk(KERN_ERR
+                       "%s: Peripheral %d is already reserved as GPIO by %s !\n",
+                       __FUNCTION__, ident, get_label(ident));
+                dump_stack();
+                local_irq_restore(flags);
+                return -EBUSY;
+        }
+
+        if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
+
+        /*
+         * 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;
+
+                        printk(KERN_ERR
+                               "%s: Peripheral %d function %d is already"
+                               "reserved by %s !\n",
+                               __FUNCTION__, ident, P_FUNCT2MUX(per),
+                                get_label(ident));
+                        dump_stack();
+                        local_irq_restore(flags);
+                        return -EBUSY;
+                }
+
+        }
+
+anyway:
+
+
+        portmux_setup(per, P_FUNCT2MUX(per));
+
+        port_setup(ident, PERIPHERAL_USAGE);
+
+        reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
+        local_irq_restore(flags);
+        set_label(ident, label);
+
+        return 0;
+}
+EXPORT_SYMBOL(peripheral_request);
+
+int peripheral_request_list(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)
+                        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;
+
+        if (check_gpio(ident) < 0)
+                return;
+
+        local_irq_save(flags);
+
+        if (unlikely(!(reserved_peri_map[gpio_bank(ident)]
+                         & gpio_bit(ident)))) {
+                local_irq_restore(flags);
+                return;
+        }
+
+        if (!(per & P_MAYSHARE)) {
+                port_setup(ident, GPIO_USAGE);
+        }
+
+        reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
+
+        local_irq_restore(flags);
+}
+EXPORT_SYMBOL(peripheral_free);
+
+void peripheral_free_list(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
@@ -574,13 +784,13 @@ int gpio_request(unsigned short gpio, const char *label)
 
         local_irq_save(flags);
 
-        if (unlikely(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
+        if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
                 printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved!\n", gpio);
                 dump_stack();
                 local_irq_restore(flags);
                 return -EBUSY;
         }
-        reserved_map[gpio_bank(gpio)] |= gpio_bit(gpio);
+        reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
 
         local_irq_restore(flags);
 
@@ -599,7 +809,7 @@ void gpio_free(unsigned short gpio)
 
         local_irq_save(flags);
 
-        if (unlikely(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
+        if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
                 printk(KERN_ERR "bfin-gpio: GPIO %d wasn't reserved!\n", gpio);
                 dump_stack();
                 local_irq_restore(flags);
@@ -608,7 +818,7 @@ void gpio_free(unsigned short gpio)
 
         default_gpio(gpio);
 
-        reserved_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
+        reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
 
         local_irq_restore(flags);
 }
@@ -618,7 +828,7 @@ void gpio_direction_input(unsigned short gpio)
 {
         unsigned long flags;
 
-        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
 
         local_irq_save(flags);
         gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
@@ -631,7 +841,7 @@ void gpio_direction_output(unsigned short gpio)
 {
         unsigned long flags;
 
-        BUG_ON(!(reserved_map[gpio_bank(gpio)] & gpio_bit(gpio)));
+        BUG_ON(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)));
 
         local_irq_save(flags);
         gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);