Angel Pons | a2ee761 | 2020-04-04 18:51:15 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Patrick Georgi | 40a3e32 | 2015-06-22 19:41:29 +0200 | [diff] [blame] | 2 | |
Kyösti Mälkki | 13f6650 | 2019-03-03 08:01:05 +0200 | [diff] [blame] | 3 | #include <device/mmio.h> |
Patrick Georgi | 40a3e32 | 2015-06-22 19:41:29 +0200 | [diff] [blame] | 4 | #include <soc/addressmap.h> |
| 5 | #include <soc/padconfig.h> |
| 6 | |
| 7 | static uint32_t * const pinmux_regs = (void *)(uintptr_t)TEGRA_APB_PINMUX_BASE; |
| 8 | static struct gpio_bank * const gpio_regs = (void *)(uintptr_t)TEGRA_GPIO_BASE; |
| 9 | |
| 10 | static inline struct gpio_bank * const get_gpio_bank_regs(int index) |
| 11 | { |
| 12 | return &gpio_regs[gpio_index_to_bank(index)]; |
| 13 | } |
| 14 | |
| 15 | static inline uint32_t pad_get_pinmux(int index) |
| 16 | { |
| 17 | return read32(&pinmux_regs[index]); |
| 18 | } |
| 19 | |
| 20 | static inline void pad_set_pinmux(int index, uint32_t reg) |
| 21 | { |
| 22 | return write32(&pinmux_regs[index], reg); |
| 23 | } |
| 24 | |
| 25 | static inline void pad_set_gpio_out(int gpio_index, int val) |
| 26 | { |
| 27 | struct gpio_bank * const regs = get_gpio_bank_regs(gpio_index); |
| 28 | int port = gpio_index_to_port(gpio_index); |
| 29 | int bit = gpio_to_bit(gpio_index); |
| 30 | |
| 31 | write32(®s->out_value_mask[port], |
| 32 | (1 << (bit + GPIO_GPIOS_PER_PORT)) | (val << bit)); |
| 33 | write32(®s->out_enable_mask[port], |
| 34 | (1 << (bit + GPIO_GPIOS_PER_PORT)) | (1 << bit)); |
| 35 | } |
| 36 | |
| 37 | static inline void pad_set_mode(int gpio_index, int sfio_or_gpio) |
| 38 | { |
| 39 | struct gpio_bank * const regs = get_gpio_bank_regs(gpio_index); |
| 40 | int port = gpio_index_to_port(gpio_index); |
| 41 | int bit = gpio_to_bit(gpio_index); |
| 42 | |
| 43 | write32(®s->config_mask[port], |
| 44 | (1 << (bit + GPIO_GPIOS_PER_PORT)) | (sfio_or_gpio << bit)); |
| 45 | } |
| 46 | |
| 47 | static inline void pad_set_gpio_mode(int gpio_index) |
| 48 | { |
| 49 | pad_set_mode(gpio_index, 1); |
| 50 | } |
| 51 | |
| 52 | static inline void pad_set_sfio_mode(int gpio_index) |
| 53 | { |
| 54 | pad_set_mode(gpio_index, 0); |
| 55 | } |
| 56 | |
| 57 | static void configure_unused_pad(const struct pad_config * const entry) |
| 58 | { |
| 59 | uint32_t reg; |
| 60 | |
| 61 | /* |
| 62 | * Tristate the pad and disable input. If power-on-reset state is a |
| 63 | * pullup maintain that. Otherwise enable pulldown. |
| 64 | */ |
| 65 | reg = pad_get_pinmux(entry->pinmux_index); |
| 66 | reg &= ~PINMUX_INPUT_ENABLE; |
| 67 | reg |= PINMUX_TRISTATE; |
| 68 | reg &= ~PINMUX_PULL_MASK; |
| 69 | if (entry->por_pullup) |
| 70 | reg |= PINMUX_PULL_UP; |
| 71 | else |
| 72 | reg |= PINMUX_PULL_DOWN; |
| 73 | pad_set_pinmux(entry->pinmux_index, reg); |
| 74 | |
| 75 | /* |
| 76 | * Set to GPIO mode if GPIO available to bypass collisions of |
| 77 | * controller signals going to more than one pad. |
| 78 | */ |
| 79 | if (entry->pad_has_gpio) |
| 80 | pad_set_gpio_mode(entry->gpio_index); |
| 81 | } |
| 82 | |
| 83 | static void configure_sfio_pad(const struct pad_config * const entry) |
| 84 | { |
| 85 | pad_set_pinmux(entry->pinmux_index, entry->pinmux_flags); |
| 86 | pad_set_sfio_mode(entry->gpio_index); |
| 87 | } |
| 88 | |
| 89 | static void configure_gpio_pad(const struct pad_config * const entry) |
| 90 | { |
| 91 | uint32_t reg; |
| 92 | |
| 93 | if (entry->gpio_out0 || entry->gpio_out1) |
| 94 | pad_set_gpio_out(entry->gpio_index, entry->gpio_out1 ? 1 : 0); |
| 95 | |
| 96 | /* Keep the original SFIO selection. */ |
| 97 | reg = pinmux_get_config(entry->pinmux_index); |
| 98 | reg &= PINMUX_FUNC_MASK; |
| 99 | reg |= entry->pinmux_flags; |
| 100 | |
| 101 | pad_set_pinmux(entry->pinmux_index, reg); |
| 102 | pad_set_gpio_mode(entry->gpio_index); |
| 103 | } |
| 104 | |
| 105 | void soc_configure_pads(const struct pad_config * const entries, size_t num) |
| 106 | { |
| 107 | size_t i; |
| 108 | |
| 109 | for (i = 0; i < num; i++) { |
| 110 | const struct pad_config * const entry = &entries[i]; |
| 111 | |
| 112 | if (entry->unused) { |
| 113 | configure_unused_pad(entry); |
| 114 | } else if (entry->sfio) { |
| 115 | configure_sfio_pad(entry); |
| 116 | } else { |
| 117 | configure_gpio_pad(entry); |
| 118 | } |
| 119 | } |
| 120 | } |