diff options
Diffstat (limited to 'src/soc/rockchip/rk3399/spi_bitbang.c')
| -rw-r--r-- | src/soc/rockchip/rk3399/spi_bitbang.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/src/soc/rockchip/rk3399/spi_bitbang.c b/src/soc/rockchip/rk3399/spi_bitbang.c new file mode 100644 index 0000000000..628cc16764 --- /dev/null +++ b/src/soc/rockchip/rk3399/spi_bitbang.c @@ -0,0 +1,157 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2018 Google LLC + * + * 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. + */ + +/* Compile this driver in place of common/spi.c for bitbang testing. + NOTE: Also need to adjust board-specific code for GPIO pinmux! */ + +#include <assert.h> +#include <gpio.h> +#include <soc/spi.h> +#include <spi_bitbang.h> +#include <spi_flash.h> + +struct rockchip_bitbang_slave { + struct spi_bitbang_ops ops; + gpio_t miso; + gpio_t mosi; + gpio_t clk; + gpio_t cs; +}; + +static int get_miso(const struct spi_bitbang_ops *ops) +{ + const struct rockchip_bitbang_slave *slave = + container_of(ops, const struct rockchip_bitbang_slave, ops); + return gpio_get(slave->miso); +} + +static void set_mosi(const struct spi_bitbang_ops *ops, int value) +{ + const struct rockchip_bitbang_slave *slave = + container_of(ops, const struct rockchip_bitbang_slave, ops); + gpio_set(slave->mosi, value); +} + +static void set_clk(const struct spi_bitbang_ops *ops, int value) +{ + const struct rockchip_bitbang_slave *slave = + container_of(ops, const struct rockchip_bitbang_slave, ops); + gpio_set(slave->clk, value); +} + +static void set_cs(const struct spi_bitbang_ops *ops, int value) +{ + const struct rockchip_bitbang_slave *slave = + container_of(ops, const struct rockchip_bitbang_slave, ops); + gpio_set(slave->cs, value); +} + +/* Can't use GPIO() here because of bug in GCC version used by Chromium OS. */ +static const struct rockchip_bitbang_slave slaves[] = { + [0] = { + .ops = { get_miso, set_mosi, set_clk, set_cs }, + .miso = { .port = 3, .bank = GPIO_A, .idx = 4 }, + .mosi = { .port = 3, .bank = GPIO_A, .idx = 5 }, + .clk = { .port = 3, .bank = GPIO_A, .idx = 6 }, + .cs = { .port = 3, .bank = GPIO_A, .idx = 7 }, + }, + [1] = { + .ops = { get_miso, set_mosi, set_clk, set_cs }, + .miso = { .port = 1, .bank = GPIO_A, .idx = 7 }, + .mosi = { .port = 1, .bank = GPIO_B, .idx = 0 }, + .clk = { .port = 1, .bank = GPIO_B, .idx = 1 }, + .cs = { .port = 1, .bank = GPIO_B, .idx = 2 }, + }, + [2] = { + .ops = { get_miso, set_mosi, set_clk, set_cs }, + .miso = { .port = 2, .bank = GPIO_B, .idx = 1 }, + .mosi = { .port = 2, .bank = GPIO_B, .idx = 2 }, + .clk = { .port = 2, .bank = GPIO_B, .idx = 3 }, + .cs = { .port = 2, .bank = GPIO_B, .idx = 4 }, + }, + [3] = { + .ops = { get_miso, set_mosi, set_clk, set_cs }, + .miso = { .port = 1, .bank = GPIO_B, .idx = 7 }, + .mosi = { .port = 1, .bank = GPIO_C, .idx = 0 }, + .clk = { .port = 1, .bank = GPIO_C, .idx = 1 }, + .cs = { .port = 1, .bank = GPIO_C, .idx = 2 }, + }, + [4] = { + .ops = { get_miso, set_mosi, set_clk, set_cs }, + .miso = { .port = 3, .bank = GPIO_A, .idx = 0 }, + .mosi = { .port = 3, .bank = GPIO_A, .idx = 1 }, + .clk = { .port = 3, .bank = GPIO_A, .idx = 2 }, + .cs = { .port = 3, .bank = GPIO_A, .idx = 3 }, + }, + [5] = { + .ops = { get_miso, set_mosi, set_clk, set_cs }, + .miso = { .port = 2, .bank = GPIO_C, .idx = 4 }, + .mosi = { .port = 2, .bank = GPIO_C, .idx = 5 }, + .clk = { .port = 2, .bank = GPIO_C, .idx = 6 }, + .cs = { .port = 2, .bank = GPIO_C, .idx = 7 }, + }, +}; + +void rockchip_spi_init(unsigned int bus, unsigned int ignored_speed_hz) +{ + assert(bus >= 0 && bus < ARRAY_SIZE(slaves)); + + gpio_output(slaves[bus].cs, 1); + gpio_output(slaves[bus].clk, 0); + gpio_input(slaves[bus].miso); + gpio_output(slaves[bus].mosi, 0); +} + +void rockchip_spi_set_sample_delay(unsigned int bus, unsigned int delay_ns) +{ + /* not supported, and not necessary for slow bitbang speeds */ +} + +static int spi_ctrlr_claim_bus(const struct spi_slave *slave) +{ + assert(slave->bus >= 0 && slave->bus < ARRAY_SIZE(slaves)); + return spi_bitbang_claim_bus(&slaves[slave->bus].ops); +} + +static void spi_ctrlr_release_bus(const struct spi_slave *slave) +{ + assert(slave->bus >= 0 && slave->bus < ARRAY_SIZE(slaves)); + spi_bitbang_release_bus(&slaves[slave->bus].ops); +} + +static int spi_ctrlr_xfer(const struct spi_slave *slave, const void *dout, + size_t bytes_out, void *din, size_t bytes_in) +{ + assert(slave->bus >= 0 && slave->bus < ARRAY_SIZE(slaves)); + return spi_bitbang_xfer(&slaves[slave->bus].ops, + dout, bytes_out, din, bytes_in); +} + +static const struct spi_ctrlr spi_ctrlr = { + .claim_bus = spi_ctrlr_claim_bus, + .release_bus = spi_ctrlr_release_bus, + .xfer = spi_ctrlr_xfer, + .max_xfer_size = 65535, +}; + +const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = { + { + .ctrlr = &spi_ctrlr, + .bus_start = 0, + .bus_end = ARRAY_SIZE(slaves) - 1, + }, +}; + +const size_t spi_ctrlr_bus_map_count = ARRAY_SIZE(spi_ctrlr_bus_map); |