Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / gpio / omap_gpio.c

diff --git a/qemu/roms/u-boot/drivers/gpio/omap_gpio.c b/qemu/roms/u-boot/drivers/gpio/omap_gpio.c
new file mode 100644 (file)
index 0000000..13dcf79
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/gpio/omap_gpio.c
@@ -0,0 +1,222 @@
+/*
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ * Tom Rix <Tom.Rix@windriver.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0
+ *
+ * This work is derived from the linux 2.6.27 kernel source
+ * To fetch, use the kernel repository
+ * git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+ * Use the v2.6.27 tag.
+ *
+ * Below is the original's header including its copyright
+ *
+ *  linux/arch/arm/plat-omap/gpio.c
+ *
+ * Support functions for OMAP GPIO
+ *
+ * Copyright (C) 2003-2005 Nokia Corporation
+ * Written by Juha Yrjölä <juha.yrjola@nokia.com>
+ */
+#include <common.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+
+#define OMAP_GPIO_DIR_OUT      0
+#define OMAP_GPIO_DIR_IN       1
+
+static inline const struct gpio_bank *get_gpio_bank(int gpio)
+{
+       return &omap_gpio_bank[gpio >> 5];
+}
+
+static inline int get_gpio_index(int gpio)
+{
+       return gpio & 0x1f;
+}
+
+int gpio_is_valid(int gpio)
+{
+       return (gpio >= 0) && (gpio < OMAP_MAX_GPIO);
+}
+
+static int check_gpio(int gpio)
+{
+       if (!gpio_is_valid(gpio)) {
+               printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
+               return -1;
+       }
+       return 0;
+}
+
+static void _set_gpio_direction(const struct gpio_bank *bank, int gpio,
+                               int is_input)
+{
+       void *reg = bank->base;
+       u32 l;
+
+       switch (bank->method) {
+       case METHOD_GPIO_24XX:
+               reg += OMAP_GPIO_OE;
+               break;
+       default:
+               return;
+       }
+       l = __raw_readl(reg);
+       if (is_input)
+               l |= 1 << gpio;
+       else
+               l &= ~(1 << gpio);
+       __raw_writel(l, reg);
+}
+
+/**
+ * Get the direction of the GPIO by reading the GPIO_OE register
+ * corresponding to the specified bank.
+ */
+static int _get_gpio_direction(const struct gpio_bank *bank, int gpio)
+{
+       void *reg = bank->base;
+       u32 v;
+
+       switch (bank->method) {
+       case METHOD_GPIO_24XX:
+               reg += OMAP_GPIO_OE;
+               break;
+       default:
+               return -1;
+       }
+
+       v = __raw_readl(reg);
+
+       if (v & (1 << gpio))
+               return OMAP_GPIO_DIR_IN;
+       else
+               return OMAP_GPIO_DIR_OUT;
+}
+
+static void _set_gpio_dataout(const struct gpio_bank *bank, int gpio,
+                               int enable)
+{
+       void *reg = bank->base;
+       u32 l = 0;
+
+       switch (bank->method) {
+       case METHOD_GPIO_24XX:
+               if (enable)
+                       reg += OMAP_GPIO_SETDATAOUT;
+               else
+                       reg += OMAP_GPIO_CLEARDATAOUT;
+               l = 1 << gpio;
+               break;
+       default:
+               printf("omap3-gpio unknown bank method %s %d\n",
+                      __FILE__, __LINE__);
+               return;
+       }
+       __raw_writel(l, reg);
+}
+
+/**
+ * Set value of the specified gpio
+ */
+int gpio_set_value(unsigned gpio, int value)
+{
+       const struct gpio_bank *bank;
+
+       if (check_gpio(gpio) < 0)
+               return -1;
+       bank = get_gpio_bank(gpio);
+       _set_gpio_dataout(bank, get_gpio_index(gpio), value);
+
+       return 0;
+}
+
+/**
+ * Get value of the specified gpio
+ */
+int gpio_get_value(unsigned gpio)
+{
+       const struct gpio_bank *bank;
+       void *reg;
+       int input;
+
+       if (check_gpio(gpio) < 0)
+               return -1;
+       bank = get_gpio_bank(gpio);
+       reg = bank->base;
+       switch (bank->method) {
+       case METHOD_GPIO_24XX:
+               input = _get_gpio_direction(bank, get_gpio_index(gpio));
+               switch (input) {
+               case OMAP_GPIO_DIR_IN:
+                       reg += OMAP_GPIO_DATAIN;
+                       break;
+               case OMAP_GPIO_DIR_OUT:
+                       reg += OMAP_GPIO_DATAOUT;
+                       break;
+               default:
+                       return -1;
+               }
+               break;
+       default:
+               return -1;
+       }
+       return (__raw_readl(reg)
+                       & (1 << get_gpio_index(gpio))) != 0;
+}
+
+/**
+ * Set gpio direction as input
+ */
+int gpio_direction_input(unsigned gpio)
+{
+       const struct gpio_bank *bank;
+
+       if (check_gpio(gpio) < 0)
+               return -1;
+
+       bank = get_gpio_bank(gpio);
+       _set_gpio_direction(bank, get_gpio_index(gpio), 1);
+
+       return 0;
+}
+
+/**
+ * Set gpio direction as output
+ */
+int gpio_direction_output(unsigned gpio, int value)
+{
+       const struct gpio_bank *bank;
+
+       if (check_gpio(gpio) < 0)
+               return -1;
+
+       bank = get_gpio_bank(gpio);
+       _set_gpio_dataout(bank, get_gpio_index(gpio), value);
+       _set_gpio_direction(bank, get_gpio_index(gpio), 0);
+
+       return 0;
+}
+
+/**
+ * Request a gpio before using it.
+ *
+ * NOTE: Argument 'label' is unused.
+ */
+int gpio_request(unsigned gpio, const char *label)
+{
+       if (check_gpio(gpio) < 0)
+               return -1;
+
+       return 0;
+}
+
+/**
+ * Reset and free the gpio after using it.
+ */
+int gpio_free(unsigned gpio)
+{
+       return 0;
+}