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>

1 files changed, 136 insertions, 0 deletions

diff --git a/drivers/gpio/mxs_gpio.c b/drivers/gpio/mxs_gpio.c
new file mode 100644
index 000000000..b7e959128
--- /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));
+}