ARM: OMAP1: ams-delta: convert latches to basic_mmio_gpio

Once ready, ams-delta specific device drivers currently calling custom
ams_delta_latch[12]_write() functions can be updated to call generic
gpio_set_value() instead, which will make them less platform dependent.
Even more, some custom ams-delta only drivers can perhaps be dropped
from the tree after converting selected ams-delta platform devices to
follow generic GPIO based device models.

The latch_gpios[] table is initially filled with all latch1 and latch2
GPIO pins in order to register and initialize them from the board file
until those are handled by respective existing device drivers (leds,
nand, lcd, serio, asoc, serial). That table will get almost empty after
the transision process is completed, holding only pins not used by any
drivers / connected to unused devices, in order to initialize them from
the board file for power saving purposes.

The new ams_delta_latch_write() function is a unified replacement for
those removed ams_delta_latch[12]_write(), and serves as a temporary
wrapper over gpio_set_value(), providing the old API for those not yet
updated device drivers, and will be removed after all custom drivers are
converted or replaced.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Tony Lindgren <tony@atomide.com>

2 files changed, 208 insertions, 30 deletions

diff --git a/arch/arm/mach-omap1/Kconfig b/arch/arm/mach-omap1/Kconfig
index 4f8d66f044e7..e14532f236a0 100644
--- a/arch/arm/mach-omap1/Kconfig
+++ b/arch/arm/mach-omap1/Kconfig
@@ -155,6 +155,7 @@ config MACH_AMS_DELTA
         bool "Amstrad E3 (Delta)"
         depends on ARCH_OMAP1 && ARCH_OMAP15XX
         select FIQ
+        select GPIO_GENERIC_PLATFORM
         help
           Support for the Amstrad E3 (codename Delta) videophone. Say Y here
           if you have such a device.
diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
index 50987c91690f..cff2711dc259 100644
--- a/arch/arm/mach-omap1/board-ams-delta.c
+++ b/arch/arm/mach-omap1/board-ams-delta.c
@@ -11,6 +11,7 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
+#include <linux/basic_mmio_gpio.h>
 #include <linux/gpio.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
@@ -40,9 +41,6 @@
 
 #include <mach/ams-delta-fiq.h>
 
-static u8 ams_delta_latch1_reg;
-static u16 ams_delta_latch2_reg;
-
 static const unsigned int ams_delta_keymap[] = {
         KEY(0, 0, KEY_F1),              /* Advert    */
 
@@ -121,39 +119,32 @@ static const unsigned int ams_delta_keymap[] = {
         KEY(7, 3, KEY_LEFTCTRL),        /* Vol down  */
 };
 
-void ams_delta_latch1_write(u8 mask, u8 value)
-{
-        ams_delta_latch1_reg &= ~mask;
-        ams_delta_latch1_reg |= value;
-        *(volatile __u8 *) AMS_DELTA_LATCH1_VIRT = ams_delta_latch1_reg;
-}
-
-void ams_delta_latch2_write(u16 mask, u16 value)
-{
-        ams_delta_latch2_reg &= ~mask;
-        ams_delta_latch2_reg |= value;
-        *(volatile __u16 *) AMS_DELTA_LATCH2_VIRT = ams_delta_latch2_reg;
-}
+#define LATCH1_PHYS     0x01000000
+#define LATCH1_VIRT     0xEA000000
+#define MODEM_PHYS      0x04000000
+#define MODEM_VIRT      0xEB000000
+#define LATCH2_PHYS     0x08000000
+#define LATCH2_VIRT     0xEC000000
 
 static struct map_desc ams_delta_io_desc[] __initdata = {
         /* AMS_DELTA_LATCH1 */
         {
-                .virtual        = AMS_DELTA_LATCH1_VIRT,
-                .pfn            = __phys_to_pfn(AMS_DELTA_LATCH1_PHYS),
+                .virtual        = LATCH1_VIRT,
+                .pfn            = __phys_to_pfn(LATCH1_PHYS),
                 .length         = 0x01000000,
                 .type           = MT_DEVICE
         },
         /* AMS_DELTA_LATCH2 */
         {
-                .virtual        = AMS_DELTA_LATCH2_VIRT,
-                .pfn            = __phys_to_pfn(AMS_DELTA_LATCH2_PHYS),
+                .virtual        = LATCH2_VIRT,
+                .pfn            = __phys_to_pfn(LATCH2_PHYS),
                 .length         = 0x01000000,
                 .type           = MT_DEVICE
         },
         /* AMS_DELTA_MODEM */
         {
-                .virtual        = AMS_DELTA_MODEM_VIRT,
-                .pfn            = __phys_to_pfn(AMS_DELTA_MODEM_PHYS),
+                .virtual        = MODEM_VIRT,
+                .pfn            = __phys_to_pfn(MODEM_PHYS),
                 .length         = 0x01000000,
                 .type           = MT_DEVICE
         }
@@ -173,6 +164,190 @@ static struct omap_board_config_kernel ams_delta_config[] __initdata = {
         { OMAP_TAG_LCD,         &ams_delta_lcd_config },
 };
 
+static struct resource latch1_resources[] __initconst = {
+        [0] = {
+                .name   = "dat",
+                .start  = LATCH1_PHYS,
+                .end    = LATCH1_PHYS + (AMS_DELTA_LATCH1_NGPIO - 1) / 8,
+                .flags  = IORESOURCE_MEM,
+        },
+};
+
+static struct bgpio_pdata latch1_pdata __initconst = {
+        .base   = AMS_DELTA_LATCH1_GPIO_BASE,
+        .ngpio  = AMS_DELTA_LATCH1_NGPIO,
+};
+
+static struct platform_device latch1_gpio_device = {
+        .name           = "basic-mmio-gpio",
+        .id             = 0,
+        .resource       = latch1_resources,
+        .num_resources  = ARRAY_SIZE(latch1_resources),
+        .dev            = {
+                .platform_data  = &latch1_pdata,
+        },
+};
+
+static struct resource latch2_resources[] __initconst = {
+        [0] = {
+                .name   = "dat",
+                .start  = LATCH2_PHYS,
+                .end    = LATCH2_PHYS + (AMS_DELTA_LATCH2_NGPIO - 1) / 8,
+                .flags  = IORESOURCE_MEM,
+        },
+};
+
+static struct bgpio_pdata latch2_pdata __initconst = {
+        .base   = AMS_DELTA_LATCH2_GPIO_BASE,
+        .ngpio  = AMS_DELTA_LATCH2_NGPIO,
+};
+
+static struct platform_device latch2_gpio_device = {
+        .name           = "basic-mmio-gpio",
+        .id             = 1,
+        .resource       = latch2_resources,
+        .num_resources  = ARRAY_SIZE(latch2_resources),
+        .dev            = {
+                .platform_data  = &latch2_pdata,
+        },
+};
+
+static struct gpio latch_gpios[] __initconst = {
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_LED_CAMERA,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "led_camera",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_LED_ADVERT,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "led_advert",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_LED_EMAIL,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "led_email",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_LED_HANDSFREE,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "led_handsfree",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_LED_VOICEMAIL,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "led_voicemail",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_LED_VOICE,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "led_voice",
+        },
+        {
+                .gpio   = AMS_DELTA_LATCH1_GPIO_BASE + 6,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "dockit1",
+        },
+        {
+                .gpio   = AMS_DELTA_LATCH1_GPIO_BASE + 7,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "dockit2",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_LCD_VBLEN,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "lcd_vblen",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_LCD_NDISP,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "lcd_ndisp",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_NAND_NCE,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "nand_nce",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_NAND_NRE,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "nand_nre",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_NAND_NWP,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "nand_nwp",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_NAND_NWE,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "nand_nwe",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_NAND_ALE,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "nand_ale",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_NAND_CLE,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "nand_cle",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_KEYBRD_PWR,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "keybrd_pwr",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_KEYBRD_DATAOUT,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "keybrd_dataout",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_SCARD_RSTIN,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "scard_rstin",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_SCARD_CMDVCC,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "scard_cmdvcc",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_MODEM_NRESET,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "modem_nreset",
+        },
+        {
+                .gpio   = AMS_DELTA_GPIO_PIN_MODEM_CODEC,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "modem_codec",
+        },
+        {
+                .gpio   = AMS_DELTA_LATCH2_GPIO_BASE + 14,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "hookflash1",
+        },
+        {
+                .gpio   = AMS_DELTA_LATCH2_GPIO_BASE + 15,
+                .flags  = GPIOF_OUT_INIT_LOW,
+                .label  = "hookflash2",
+        },
+};
+
+void ams_delta_latch_write(int base, int ngpio, u16 mask, u16 value)
+{
+        int bit = 0;
+        u16 bitpos = 1 << bit;
+
+        for (; bit < ngpio; bit++, bitpos = bitpos << 1) {
+                if (!(mask & bitpos))
+                        continue;
+                gpio_set_value(base + bit, (value & bitpos) != 0);
+        }
+}
+EXPORT_SYMBOL(ams_delta_latch_write);
+
 static struct resource ams_delta_nand_resources[] = {
         [0] = {
                 .start  = OMAP1_MPUIO_BASE,
@@ -275,11 +450,13 @@ static struct omap1_cam_platform_data ams_delta_camera_platform_data = {
 };
 
 static struct platform_device *ams_delta_devices[] __initdata = {
+        &latch1_gpio_device,
+        &latch2_gpio_device,
         &ams_delta_kp_device,
         &ams_delta_camera_device,
 };
 
-static struct platform_device *late_devices[] __initdata = {
+static struct platform_device *late_devices[] __initconst = {
         &ams_delta_nand_device,
         &ams_delta_lcd_device,
         &ams_delta_led_device,
@@ -325,8 +502,8 @@ static void __init ams_delta_init(void)
 
 static struct plat_serial8250_port ams_delta_modem_ports[] = {
         {
-                .membase        = IOMEM(AMS_DELTA_MODEM_VIRT),
-                .mapbase        = AMS_DELTA_MODEM_PHYS,
+                .membase        = IOMEM(MODEM_VIRT),
+                .mapbase        = MODEM_PHYS,
                 .irq            = -EINVAL, /* changed later */
                 .flags          = UPF_BOOT_AUTOCONF,
                 .irqflags       = IRQF_TRIGGER_RISING,
@@ -352,8 +529,11 @@ static int __init late_init(void)
         if (!machine_is_ams_delta())
                 return -ENODEV;
 
-        /* Clear latch2 (NAND, LCD, modem enable) */
-        ams_delta_latch2_write(~0, 0);
+        err = gpio_request_array(latch_gpios, ARRAY_SIZE(latch_gpios));
+        if (err) {
+                pr_err("Couldn't take over latch1/latch2 GPIO pins\n");
+                return err;
+        }
 
         platform_add_devices(late_devices, ARRAY_SIZE(late_devices));
 
@@ -399,6 +579,3 @@ MACHINE_START(AMS_DELTA, "Amstrad E3 (Delta)")
         .init_machine   = ams_delta_init,
         .timer          = &omap1_timer,
 MACHINE_END
-
-EXPORT_SYMBOL(ams_delta_latch1_write);
-EXPORT_SYMBOL(ams_delta_latch2_write);