iMX28: Add GPIO control

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>

diff --git a/arch/arm/cpu/arm926ejs/mx28/mx28.c b/arch/arm/cpu/arm926ejs/mx28/mx28.c
index 446ea8b23c940b27d1d07a0386e629bfc3b62217..e990f3c09e619c97a0e5a93570ed007c32dcb9d2 100644 (file)
--- a/arch/arm/cpu/arm926ejs/mx28/mx28.c
+++ b/arch/arm/cpu/arm926ejs/mx28/mx28.c
@@ -31,6 +31,7 @@
 #include <asm/io.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/gpio.h>
+#include <asm/arch/iomux.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/sys_proto.h>
 
@@ -134,6 +135,11 @@ int arch_cpu_init(void)
 
        udelay(1000);
 
+       /*
+        * Configure GPIO unit
+        */
+       mxs_gpio_init();
+
        return 0;
 }
 #endif

diff --git a/arch/arm/include/asm/arch-mx28/gpio.h b/arch/arm/include/asm/arch-mx28/gpio.h
new file mode 100644 (file)
index 0000000..be1c944
--- /dev/null
+++ b/arch/arm/include/asm/arch-mx28/gpio.h
@@ -0,0 +1,32 @@
+/*
+ * Freescale i.MX28 GPIO
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef        __MX28_GPIO_H__
+#define        __MX28_GPIO_H__
+
+#ifdef CONFIG_MXS_GPIO
+void mxs_gpio_init(void);
+#else
+inline void mxs_gpio_init(void) {}
+#endif
+
+#endif /* __MX28_GPIO_H__ */

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index f505813d0eae9974e6a5444066d0edd5aeae0f7f..e1142d14be4810340e73666800d5b1cfc79443d1 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -30,6 +30,7 @@ COBJS-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o
 COBJS-$(CONFIG_MARVELL_GPIO)   += mvgpio.o
 COBJS-$(CONFIG_MARVELL_MFP)    += mvmfp.o
 COBJS-$(CONFIG_MXC_GPIO)       += mxc_gpio.o
+COBJS-$(CONFIG_MXS_GPIO)       += mxs_gpio.o
 COBJS-$(CONFIG_PCA953X)                += pca953x.o
 COBJS-$(CONFIG_PCA9698)                += pca9698.o
 COBJS-$(CONFIG_S5P)            += s5p_gpio.o

diff --git a/drivers/gpio/mxs_gpio.c b/drivers/gpio/mxs_gpio.c
new file mode 100644 (file)
index 0000000..b7e9591
--- /dev/null
+++ b/drivers/gpio/mxs_gpio.c
@@ -0,0 +1,136 @@
+/*
+ * Freescale i.MX28 GPIO control code
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ * on behalf of DENX Software Engineering GmbH
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <netdev.h>
+#include <asm/errno.h>
+#include <asm/io.h>
+#include <asm/arch/iomux.h>
+#include <asm/arch/imx-regs.h>
+
+#if    defined(CONFIG_MX23)
+#define        PINCTRL_BANKS           3
+#define        PINCTRL_DOUT(n)         (0x0500 + ((n) * 0x10))
+#define        PINCTRL_DIN(n)          (0x0600 + ((n) * 0x10))
+#define        PINCTRL_DOE(n)          (0x0700 + ((n) * 0x10))
+#define        PINCTRL_PIN2IRQ(n)      (0x0800 + ((n) * 0x10))
+#define        PINCTRL_IRQEN(n)        (0x0900 + ((n) * 0x10))
+#define        PINCTRL_IRQSTAT(n)      (0x0c00 + ((n) * 0x10))
+#elif  defined(CONFIG_MX28)
+#define        PINCTRL_BANKS           5
+#define        PINCTRL_DOUT(n)         (0x0700 + ((n) * 0x10))
+#define        PINCTRL_DIN(n)          (0x0900 + ((n) * 0x10))
+#define        PINCTRL_DOE(n)          (0x0b00 + ((n) * 0x10))
+#define        PINCTRL_PIN2IRQ(n)      (0x1000 + ((n) * 0x10))
+#define        PINCTRL_IRQEN(n)        (0x1100 + ((n) * 0x10))
+#define        PINCTRL_IRQSTAT(n)      (0x1400 + ((n) * 0x10))
+#else
+#error "Please select CONFIG_MX23 or CONFIG_MX28"
+#endif
+
+#define GPIO_INT_FALL_EDGE     0x0
+#define GPIO_INT_LOW_LEV       0x1
+#define GPIO_INT_RISE_EDGE     0x2
+#define GPIO_INT_HIGH_LEV      0x3
+#define GPIO_INT_LEV_MASK      (1 << 0)
+#define GPIO_INT_POL_MASK      (1 << 1)
+
+void mxs_gpio_init(void)
+{
+       int i;
+
+       for (i = 0; i < PINCTRL_BANKS; i++) {
+               writel(0, MXS_PINCTRL_BASE + PINCTRL_PIN2IRQ(i));
+               writel(0, MXS_PINCTRL_BASE + PINCTRL_IRQEN(i));
+               /* Use SCT address here to clear the IRQSTAT bits */
+               writel(0xffffffff, MXS_PINCTRL_BASE + PINCTRL_IRQSTAT(i) + 8);
+       }
+}
+
+int gpio_get_value(int gp)
+{
+       uint32_t bank = PAD_BANK(gp);
+       uint32_t offset = PINCTRL_DIN(bank);
+       struct mx28_register *reg =
+               (struct mx28_register *)(MXS_PINCTRL_BASE + offset);
+
+       return (readl(&reg->reg) >> PAD_PIN(gp)) & 1;
+}
+
+void gpio_set_value(int gp, int value)
+{
+       uint32_t bank = PAD_BANK(gp);
+       uint32_t offset = PINCTRL_DOUT(bank);
+       struct mx28_register *reg =
+               (struct mx28_register *)(MXS_PINCTRL_BASE + offset);
+
+       if (value)
+               writel(1 << PAD_PIN(gp), &reg->reg_set);
+       else
+               writel(1 << PAD_PIN(gp), &reg->reg_clr);
+}
+
+int gpio_direction_input(int gp)
+{
+       uint32_t bank = PAD_BANK(gp);
+       uint32_t offset = PINCTRL_DOE(bank);
+       struct mx28_register *reg =
+               (struct mx28_register *)(MXS_PINCTRL_BASE + offset);
+
+       writel(1 << PAD_PIN(gp), &reg->reg_clr);
+
+       return 0;
+}
+
+int gpio_direction_output(int gp, int value)
+{
+       uint32_t bank = PAD_BANK(gp);
+       uint32_t offset = PINCTRL_DOE(bank);
+       struct mx28_register *reg =
+               (struct mx28_register *)(MXS_PINCTRL_BASE + offset);
+
+       writel(1 << PAD_PIN(gp), &reg->reg_set);
+
+       gpio_set_value(gp, value);
+
+       return 0;
+}
+
+int gpio_request(int gp, const char *label)
+{
+       if (PAD_BANK(gp) > PINCTRL_BANKS)
+               return -EINVAL;
+
+       return 0;
+}
+
+void gpio_free(int gp)
+{
+}
+
+void gpio_toggle_value(int gp)
+{
+       gpio_set_value(gp, !gpio_get_value(gp));
+}