Angel Pons | bbc99cf | 2020-04-04 18:51:23 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Julius Werner | 4783db2 | 2018-03-27 16:28:52 -0700 | [diff] [blame] | 2 | |
| 3 | /* Compile this driver in place of common/spi.c for bitbang testing. |
| 4 | NOTE: Also need to adjust board-specific code for GPIO pinmux! */ |
| 5 | |
| 6 | #include <assert.h> |
| 7 | #include <gpio.h> |
| 8 | #include <soc/spi.h> |
| 9 | #include <spi_bitbang.h> |
| 10 | #include <spi_flash.h> |
Elyes HAOUAS | c379d46 | 2020-07-27 08:16:24 +0200 | [diff] [blame] | 11 | #include <stddef.h> |
Julius Werner | 4783db2 | 2018-03-27 16:28:52 -0700 | [diff] [blame] | 12 | |
| 13 | struct rockchip_bitbang_slave { |
| 14 | struct spi_bitbang_ops ops; |
| 15 | gpio_t miso; |
| 16 | gpio_t mosi; |
| 17 | gpio_t clk; |
| 18 | gpio_t cs; |
| 19 | }; |
| 20 | |
| 21 | static int get_miso(const struct spi_bitbang_ops *ops) |
| 22 | { |
| 23 | const struct rockchip_bitbang_slave *slave = |
| 24 | container_of(ops, const struct rockchip_bitbang_slave, ops); |
| 25 | return gpio_get(slave->miso); |
| 26 | } |
| 27 | |
| 28 | static void set_mosi(const struct spi_bitbang_ops *ops, int value) |
| 29 | { |
| 30 | const struct rockchip_bitbang_slave *slave = |
| 31 | container_of(ops, const struct rockchip_bitbang_slave, ops); |
| 32 | gpio_set(slave->mosi, value); |
| 33 | } |
| 34 | |
| 35 | static void set_clk(const struct spi_bitbang_ops *ops, int value) |
| 36 | { |
| 37 | const struct rockchip_bitbang_slave *slave = |
| 38 | container_of(ops, const struct rockchip_bitbang_slave, ops); |
| 39 | gpio_set(slave->clk, value); |
| 40 | } |
| 41 | |
| 42 | static void set_cs(const struct spi_bitbang_ops *ops, int value) |
| 43 | { |
| 44 | const struct rockchip_bitbang_slave *slave = |
| 45 | container_of(ops, const struct rockchip_bitbang_slave, ops); |
| 46 | gpio_set(slave->cs, value); |
| 47 | } |
| 48 | |
Jon Murphy | c4e9045 | 2022-06-28 10:36:23 -0600 | [diff] [blame] | 49 | /* Can't use GPIO() here because of bug in GCC version used by ChromiumOS. */ |
Julius Werner | 4783db2 | 2018-03-27 16:28:52 -0700 | [diff] [blame] | 50 | static const struct rockchip_bitbang_slave slaves[] = { |
| 51 | [0] = { |
| 52 | .ops = { get_miso, set_mosi, set_clk, set_cs }, |
| 53 | .miso = { .port = 3, .bank = GPIO_A, .idx = 4 }, |
| 54 | .mosi = { .port = 3, .bank = GPIO_A, .idx = 5 }, |
| 55 | .clk = { .port = 3, .bank = GPIO_A, .idx = 6 }, |
| 56 | .cs = { .port = 3, .bank = GPIO_A, .idx = 7 }, |
| 57 | }, |
| 58 | [1] = { |
| 59 | .ops = { get_miso, set_mosi, set_clk, set_cs }, |
| 60 | .miso = { .port = 1, .bank = GPIO_A, .idx = 7 }, |
| 61 | .mosi = { .port = 1, .bank = GPIO_B, .idx = 0 }, |
| 62 | .clk = { .port = 1, .bank = GPIO_B, .idx = 1 }, |
| 63 | .cs = { .port = 1, .bank = GPIO_B, .idx = 2 }, |
| 64 | }, |
| 65 | [2] = { |
| 66 | .ops = { get_miso, set_mosi, set_clk, set_cs }, |
| 67 | .miso = { .port = 2, .bank = GPIO_B, .idx = 1 }, |
| 68 | .mosi = { .port = 2, .bank = GPIO_B, .idx = 2 }, |
| 69 | .clk = { .port = 2, .bank = GPIO_B, .idx = 3 }, |
| 70 | .cs = { .port = 2, .bank = GPIO_B, .idx = 4 }, |
| 71 | }, |
| 72 | [3] = { |
| 73 | .ops = { get_miso, set_mosi, set_clk, set_cs }, |
| 74 | .miso = { .port = 1, .bank = GPIO_B, .idx = 7 }, |
| 75 | .mosi = { .port = 1, .bank = GPIO_C, .idx = 0 }, |
| 76 | .clk = { .port = 1, .bank = GPIO_C, .idx = 1 }, |
| 77 | .cs = { .port = 1, .bank = GPIO_C, .idx = 2 }, |
| 78 | }, |
| 79 | [4] = { |
| 80 | .ops = { get_miso, set_mosi, set_clk, set_cs }, |
| 81 | .miso = { .port = 3, .bank = GPIO_A, .idx = 0 }, |
| 82 | .mosi = { .port = 3, .bank = GPIO_A, .idx = 1 }, |
| 83 | .clk = { .port = 3, .bank = GPIO_A, .idx = 2 }, |
| 84 | .cs = { .port = 3, .bank = GPIO_A, .idx = 3 }, |
| 85 | }, |
| 86 | [5] = { |
| 87 | .ops = { get_miso, set_mosi, set_clk, set_cs }, |
| 88 | .miso = { .port = 2, .bank = GPIO_C, .idx = 4 }, |
| 89 | .mosi = { .port = 2, .bank = GPIO_C, .idx = 5 }, |
| 90 | .clk = { .port = 2, .bank = GPIO_C, .idx = 6 }, |
| 91 | .cs = { .port = 2, .bank = GPIO_C, .idx = 7 }, |
| 92 | }, |
| 93 | }; |
| 94 | |
| 95 | void rockchip_spi_init(unsigned int bus, unsigned int ignored_speed_hz) |
| 96 | { |
| 97 | assert(bus >= 0 && bus < ARRAY_SIZE(slaves)); |
| 98 | |
| 99 | gpio_output(slaves[bus].cs, 1); |
| 100 | gpio_output(slaves[bus].clk, 0); |
| 101 | gpio_input(slaves[bus].miso); |
| 102 | gpio_output(slaves[bus].mosi, 0); |
| 103 | } |
| 104 | |
| 105 | void rockchip_spi_set_sample_delay(unsigned int bus, unsigned int delay_ns) |
| 106 | { |
| 107 | /* not supported, and not necessary for slow bitbang speeds */ |
| 108 | } |
| 109 | |
| 110 | static int spi_ctrlr_claim_bus(const struct spi_slave *slave) |
| 111 | { |
| 112 | assert(slave->bus >= 0 && slave->bus < ARRAY_SIZE(slaves)); |
| 113 | return spi_bitbang_claim_bus(&slaves[slave->bus].ops); |
| 114 | } |
| 115 | |
| 116 | static void spi_ctrlr_release_bus(const struct spi_slave *slave) |
| 117 | { |
| 118 | assert(slave->bus >= 0 && slave->bus < ARRAY_SIZE(slaves)); |
| 119 | spi_bitbang_release_bus(&slaves[slave->bus].ops); |
| 120 | } |
| 121 | |
| 122 | static int spi_ctrlr_xfer(const struct spi_slave *slave, const void *dout, |
| 123 | size_t bytes_out, void *din, size_t bytes_in) |
| 124 | { |
| 125 | assert(slave->bus >= 0 && slave->bus < ARRAY_SIZE(slaves)); |
| 126 | return spi_bitbang_xfer(&slaves[slave->bus].ops, |
| 127 | dout, bytes_out, din, bytes_in); |
| 128 | } |
| 129 | |
| 130 | static const struct spi_ctrlr spi_ctrlr = { |
| 131 | .claim_bus = spi_ctrlr_claim_bus, |
| 132 | .release_bus = spi_ctrlr_release_bus, |
| 133 | .xfer = spi_ctrlr_xfer, |
| 134 | .max_xfer_size = 65535, |
| 135 | }; |
| 136 | |
| 137 | const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = { |
| 138 | { |
| 139 | .ctrlr = &spi_ctrlr, |
| 140 | .bus_start = 0, |
| 141 | .bus_end = ARRAY_SIZE(slaves) - 1, |
| 142 | }, |
| 143 | }; |
| 144 | |
| 145 | const size_t spi_ctrlr_bus_map_count = ARRAY_SIZE(spi_ctrlr_bus_map); |