tegra132: provide pad configuration interface

Instead of sprinkling the pad configuration and pinmux
selection throughout the code allow for a data-driven
initialization sequence. Most of the calls in the
original pinmux functions require 12 bytes per pad
plus the support code. This implementation allows for
4 bytes per pad in addition to the support code.

BUG=chrome-os-partner:29981
TEST=Built and booted into depthcharge on rush.

Change-Id: I22c243a5f9891a97e14b78d8c8064e36adaf50b8
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 9329c17bbadcaab803b38842e38e1704d262817d
Original-Change-Id: I3a119b4068e880b74a0a1597f143d7c4e108a6c1
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/210833
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/8875
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 138 insertions, 0 deletions

diff --git a/src/soc/nvidia/tegra132/padconfig.c b/src/soc/nvidia/tegra132/padconfig.c
new file mode 100644
index 0000000000..621898d2f7
--- /dev/null
+++ b/src/soc/nvidia/tegra132/padconfig.c
@@ -0,0 +1,138 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 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; 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#include <arch/io.h>
+#include <soc/addressmap.h>
+#include <soc/padconfig.h>
+
+static uint32_t * const pinmux_regs = (void *)(uintptr_t)TEGRA_APB_PINMUX_BASE;
+static struct gpio_bank * const gpio_regs = (void *)(uintptr_t)TEGRA_GPIO_BASE;
+
+static inline struct gpio_bank * const get_gpio_bank_regs(int index)
+{
+	return &gpio_regs[gpio_index_to_bank(index)];
+}
+
+static inline uint32_t pad_get_pinmux(int index)
+{
+	return read32(&pinmux_regs[index]);
+}
+
+static inline void pad_set_pinmux(int index, uint32_t reg)
+{
+	return write32(reg, &pinmux_regs[index]);
+}
+
+static inline void pad_set_gpio_out(int gpio_index, int val)
+{
+	struct gpio_bank * const regs = get_gpio_bank_regs(gpio_index);
+	int port = gpio_index_to_port(gpio_index);
+	int bit = gpio_to_bit(gpio_index);
+
+	write32((1 << (bit + GPIO_GPIOS_PER_PORT)) | (val << bit),
+		&regs->out_value_mask[port]);
+	write32((1 << (bit + GPIO_GPIOS_PER_PORT)) | (1 << bit),
+		&regs->out_enable_mask[port]);
+}
+
+static inline void pad_set_mode(int gpio_index, int sfio_or_gpio)
+{
+	struct gpio_bank * const regs = get_gpio_bank_regs(gpio_index);
+	int port = gpio_index_to_port(gpio_index);
+	int bit = gpio_to_bit(gpio_index);
+
+	write32((1 << (bit + GPIO_GPIOS_PER_PORT)) | (sfio_or_gpio << bit),
+		&regs->config_mask[port]);
+}
+
+static inline void pad_set_gpio_mode(int gpio_index)
+{
+	pad_set_mode(gpio_index, 1);
+}
+
+static inline void pad_set_sfio_mode(int gpio_index)
+{
+	pad_set_mode(gpio_index, 0);
+}
+
+static void configure_unused_pad(const struct pad_config * const entry)
+{
+	uint32_t reg;
+
+	/*
+	 * Tristate the pad and disable input. If power-on-reset state is a
+	 * pullup maintain that. Otherwise enable pulldown.
+	 */
+	reg = pad_get_pinmux(entry->pinmux_index);
+	reg &= ~PINMUX_INPUT_ENABLE;
+	reg |= PINMUX_TRISTATE;
+	reg &= ~PINMUX_PULL_MASK;
+	if (entry->por_pullup)
+		reg |= PINMUX_PULL_UP;
+	else
+		reg |= PINMUX_PULL_DOWN;
+	pad_set_pinmux(entry->pinmux_index, reg);
+
+	/*
+	 * Set to GPIO mode if GPIO available to bypass collisions of
+	 * controller signals going to more than one pad.
+	 */
+	if (entry->pad_has_gpio)
+		pad_set_gpio_mode(entry->gpio_index);
+}
+
+static void configure_sfio_pad(const struct pad_config * const entry)
+{
+	pad_set_pinmux(entry->pinmux_index, entry->pinmux_flags);
+	pad_set_sfio_mode(entry->gpio_index);
+}
+
+static void configure_gpio_pad(const struct pad_config * const entry)
+{
+	uint32_t reg;
+
+	if (entry->gpio_out0 || entry->gpio_out1)
+		pad_set_gpio_out(entry->gpio_index, entry->gpio_out1 ? 1 : 0);
+
+	/* Keep the original SFIO selection. */
+	reg = pinmux_get_config(entry->pinmux_index);
+	reg &= PINMUX_FUNC_MASK;
+	reg |= entry->pinmux_flags;
+
+	pad_set_pinmux(entry->pinmux_index, reg);
+	pad_set_gpio_mode(entry->gpio_index);
+}
+
+void soc_configure_pads(const struct pad_config * const entries, size_t num)
+{
+	size_t i;
+
+	for (i = 0; i < num; i++) {
+		const struct pad_config * const entry = &entries[i];
+
+		if (entry->unused) {
+			configure_unused_pad(entry);
+		} else if (entry->sfio) {
+			configure_sfio_pad(entry);
+		} else {
+			configure_gpio_pad(entry);
+		}
+	}
+}