am335x: Add some code for manipulating GPIOs

Add code for manipulating the GPIOs on the am335x. The API is patterned after
the one used for the Exynos SOCs.

Change-Id: I275317304bd0682f348f72f1c77ed5613065af3f
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: https://review.coreboot.org/3942
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 70 insertions, 0 deletions

diff --git a/src/cpu/ti/am335x/gpio.h b/src/cpu/ti/am335x/gpio.h
new file mode 100644
index 0000000000..4f4e635202
--- /dev/null
+++ b/src/cpu/ti/am335x/gpio.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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.
+ */
+
+#ifndef __CPU_TI_AM335X_GPIO_H__
+#define __CPU_TI_AM335X_GPIO_H__
+
+#include <stdint.h>
+
+enum {
+	AM335X_GPIO_BITS_PER_BANK = 32
+};
+
+struct am335x_gpio_regs {
+	uint32_t revision;		// 0x0
+	uint8_t _rsv0[0xc];		// 0x4-0xf
+	uint32_t sysconfig;		// 0x10
+	uint8_t _rsv1[0xc];		// 0x14-0x1f
+	uint32_t eoi;			// 0x20
+	uint32_t irqstatus_raw_0;	// 0x24
+	uint32_t irqstatus_raw_1;	// 0x28
+	uint32_t irqstatus_0;		// 0x2c
+	uint32_t irqstatus_1;		// 0x30
+	uint32_t irqstatus_set_0;	// 0x34
+	uint32_t irqstatus_set_1;	// 0x38
+	uint32_t irqstatus_clr_0;	// 0x3c
+	uint32_t irqstatus_clk_1;	// 0x40
+	uint32_t irqwaken_0;		// 0x44
+	uint32_t irqwaken_1;		// 0x48
+	uint8_t _rsv2[0xc8];		// 0x4c-0x113
+	uint32_t sysstatus;		// 0x114
+	uint8_t _rsv3[0x18];		// 0x118-0x12f
+	uint32_t ctrl;			// 0x130
+	uint32_t oe;			// 0x134
+	uint32_t datain;		// 0x138
+	uint32_t dataout;		// 0x13c
+	uint32_t leveldetect0;		// 0x140
+	uint32_t leveldetect1;		// 0x144
+	uint32_t risingdetect;		// 0x148
+	uint32_t fallingdetect;		// 0x14c
+	uint32_t debouncenable;		// 0x150
+	uint32_t debouncingtime;	// 0x154
+	uint8_t _rsv4[0x38];		// 0x158-0x18f
+	uint32_t cleardataout;		// 0x190
+	uint32_t setdataout;		// 0x194
+} __attribute__((packed));
+
+static struct am335x_gpio_regs * const am335x_gpio_banks[] = {
+	(void *)0x44e07000, (void *)0x4804c000,
+	(void *)0x481ac000, (void *)0x481ae000
+};
+
+void am335x_disable_gpio_irqs(void);
+
+int gpio_direction_input(unsigned gpio);
+int gpio_direction_output(unsigned gpio, int value);
+int gpio_get_value(unsigned gpio);
+int gpio_set_value(unsigned gpio, int value);
+
+#endif	/* __CPU_TI_AM335X_CLOCK_H__ */