diff options
Diffstat (limited to 'src/soc/nvidia/tegra210/padconfig.c')
| -rw-r--r-- | src/soc/nvidia/tegra210/padconfig.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra210/padconfig.c b/src/soc/nvidia/tegra210/padconfig.c new file mode 100644 index 0000000000..ab93454343 --- /dev/null +++ b/src/soc/nvidia/tegra210/padconfig.c @@ -0,0 +1,137 @@ +/* + * 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. + */ + +#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(&pinmux_regs[index], reg); +} + +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(®s->out_value_mask[port], + (1 << (bit + GPIO_GPIOS_PER_PORT)) | (val << bit)); + write32(®s->out_enable_mask[port], + (1 << (bit + GPIO_GPIOS_PER_PORT)) | (1 << bit)); +} + +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(®s->config_mask[port], + (1 << (bit + GPIO_GPIOS_PER_PORT)) | (sfio_or_gpio << bit)); +} + +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); + } + } +} |