soc/marvell/armada38x: Add gpio driver for armada38x

Port gpio driver from uboot to coreboot

BUG=chrome-os-partner:47462
TEST=None
BRANCH=tot

Change-Id: Ib6cfbb6e44cb642c7af937778076a51d405ff4a2
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 5cf94502faad96147d4a4adb42eb13edb64a6439
Original-Change-Id: Ia2e081a85347e2fc8bb365ca527ee2ee32af86f1
Original-Signed-off-by: Ruilin Hao <rlhao@marvell.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/313341
Original-Commit-Ready: Kan Yan <kyan@google.com>
Original-Tested-by: Kan Yan <kyan@google.com>
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Kan Yan <kyan@google.com>
Original-Reviewed-by: Yuji Sasaki <sasakiy@chromium.org>
Reviewed-on: https://review.coreboot.org/13112
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 113 insertions, 0 deletions

diff --git a/src/soc/marvell/armada38x/gpio.c b/src/soc/marvell/armada38x/gpio.c
new file mode 100644
index 0000000000..1c5a4c78c6
--- /dev/null
+++ b/src/soc/marvell/armada38x/gpio.c
@@ -0,0 +1,113 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Marvell 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#include <arch/io.h>
+#include <gpio.h>
+#include <soc/common.h>
+#include <console/console.h>
+
+#define MV_GPIO_MAX_NUM 59
+
+#define MV_GPP_IN 0xFFFFFFFF /* GPP input */
+#define MV_GPP_OUT 0 /* GPP output */
+
+#define MV_GPP_REGS_BASE(unit) (0x18100 + ((unit)*0x40))
+#define GPP_DATA_OUT_EN_REG(grp) (MV_GPP_REGS_BASE(grp) + 0x04)
+#define GPP_DATA_IN_REG(grp) (MV_GPP_REGS_BASE(grp) + 0x10)
+#define GPP_DATA_OUT_REG(grp) (MV_GPP_REGS_BASE(grp) + 0x00)
+
+static void gpp_reg_set(u32 group, u32 reg_offs, u32 mask, u32 value);
+static int mv_gpp_type_set(u32 group, u32 mask, u32 value);
+static u32 mv_gpp_value_get(u32 group, u32 mask);
+static int mv_gpp_value_set(u32 group, u32 mask, u32 value);
+
+void gpp_reg_set(u32 group, u32 reg_offs, u32 mask, u32 value)
+{
+	u32 gpp_data;
+
+	gpp_data = mrvl_reg_read(reg_offs);
+	gpp_data &= ~mask;
+	gpp_data |= (value & mask);
+	mrvl_reg_write(reg_offs, gpp_data);
+}
+
+int mv_gpp_type_set(u32 group, u32 mask, u32 value)
+{
+	gpp_reg_set(group, GPP_DATA_OUT_EN_REG(group), mask, value);
+	return MV_OK;
+}
+
+u32 mv_gpp_value_get(u32 group, u32 mask)
+{
+	u32 gpp_data;
+
+	gpp_data = mrvl_reg_read(GPP_DATA_IN_REG(group));
+	gpp_data &= mask;
+	return gpp_data;
+}
+
+int mv_gpp_value_set(u32 group, u32 mask, u32 value)
+{
+	u32 out_enable;
+
+	/* verify that the gpp pin is configured as output*/
+	/* Note that in the register out enabled -> bit = '0'.*/
+	out_enable = ~(mrvl_reg_read(GPP_DATA_OUT_EN_REG(group)));
+	if ((out_enable & mask) != mask) {
+		printk(BIOS_ERR,
+			"Mask and out_enable mismatch(mask:0x%x, out_enable:0x%x).\n",
+			mask, (out_enable & mask));
+		return MV_ERROR;
+	}
+	gpp_reg_set(group, GPP_DATA_OUT_REG(group), mask, value);
+	return MV_OK;
+}
+
+static inline int gpio_not_valid(gpio_t gpio)
+{
+	return (gpio > MV_GPIO_MAX_NUM);
+}
+
+int gpio_get(gpio_t gpio)
+{
+	u32 group = 0;
+	u32 gpp_data;
+
+	if (gpio_not_valid(gpio))
+		return MV_BAD_PARAM;
+	if (gpio >= 32) {
+		group = 1;
+		gpio -= 32;
+	}
+
+	mv_gpp_type_set(group, (1 << gpio), MV_GPP_IN & (1 << gpio));
+	gpp_data = mv_gpp_value_get(group, (1 << gpio));
+	return (gpp_data != 0);
+}
+
+void gpio_set(gpio_t gpio, int value)
+{
+	u32 group = 0;
+
+	if (gpio_not_valid(gpio))
+		return;
+	if (gpio >= 32) {
+		group = 1;
+		gpio -= 32;
+	}
+
+	mv_gpp_type_set(group, (1 << gpio), MV_GPP_OUT & (1 << gpio));
+	mv_gpp_value_set(group, (1 << gpio), (value ? (1 << gpio) : 0));
+}