[U-Boot] [PATCH 06/15] iMX28: Add GPIO control
Marek Vasut
marek.vasut at gmail.com
Mon Sep 12 06:06:40 CEST 2011
Signed-off-by: Marek Vasut <marek.vasut at gmail.com>
Cc: Stefano Babic <sbabic at denx.de>
Cc: Wolfgang Denk <wd at denx.de>
Cc: Detlev Zundel <dzu at denx.de>
---
arch/arm/cpu/arm926ejs/mx28/mx28.c | 6 ++
arch/arm/include/asm/arch-mx28/gpio.h | 32 ++++++++
drivers/gpio/Makefile | 1 +
drivers/gpio/mxs_gpio.c | 136 +++++++++++++++++++++++++++++++++
4 files changed, 175 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/include/asm/arch-mx28/gpio.h
create mode 100644 drivers/gpio/mxs_gpio.c
diff --git a/arch/arm/cpu/arm926ejs/mx28/mx28.c b/arch/arm/cpu/arm926ejs/mx28/mx28.c
index 58ac9ae..d53ce99 100644
--- 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>
@@ -135,6 +136,11 @@ 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
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 at 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 62ec97d..4332418 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -29,6 +29,7 @@ COBJS-$(CONFIG_AT91_GPIO) += at91_gpio.o
COBJS-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.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-$(CONFIG_S5P) += s5p_gpio.o
COBJS-$(CONFIG_TEGRA2_GPIO) += tegra2_gpio.o
diff --git a/drivers/gpio/mxs_gpio.c b/drivers/gpio/mxs_gpio.c
new file mode 100644
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 at 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) >> 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_set);
+ else
+ writel(1 << PAD_PIN(gp), ®->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_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_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));
+}
--
1.7.5.4
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