Maximilian Brune | 2ccb8e7 | 2024-01-14 21:59:27 +0600 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | //TODO needs work |
| 4 | |
| 5 | #include <device/mmio.h> |
| 6 | #include <soc/spi.h> |
| 7 | #include <soc/clock.h> |
| 8 | #include <soc/addressmap.h> |
| 9 | #include <delay.h> |
| 10 | #include <lib.h> |
| 11 | |
| 12 | #include "spi_internal.h" |
| 13 | |
| 14 | static struct fu740_spi_ctrl *fu740_spi_ctrls[] = { |
| 15 | (struct fu740_spi_ctrl *)FU740_QSPI0, |
| 16 | (struct fu740_spi_ctrl *)FU740_QSPI1, |
| 17 | (struct fu740_spi_ctrl *)FU740_QSPI2 |
| 18 | }; |
| 19 | |
| 20 | // Wait until SPI is ready for transmission and transmit byte. |
| 21 | static void fu740_spi_tx(volatile struct fu740_spi_ctrl *spictrl_reg, uint8_t in) |
| 22 | { |
| 23 | #if __riscv_atomic |
| 24 | int32_t r; |
| 25 | do { |
| 26 | asm volatile ( |
| 27 | "amoor.w %0, %2, %1\n" |
| 28 | : "=r" (r), "+A" (spictrl_reg->txdata.raw_bits) |
| 29 | : "r" (in) |
| 30 | ); |
| 31 | } while (r < 0); |
| 32 | #else |
| 33 | while ((int32_t) spictrl_reg->txdata.raw_bits < 0) |
| 34 | ; |
| 35 | spictrl_reg->txdata.data = in; |
| 36 | #endif |
| 37 | } |
| 38 | |
| 39 | // Wait until SPI receive queue has data and read byte. |
| 40 | static uint8_t fu740_spi_rx(volatile struct fu740_spi_ctrl *spictrl_reg) |
| 41 | { |
| 42 | int32_t out; |
| 43 | while ((out = (int32_t) spictrl_reg->rxdata.raw_bits) < 0) |
| 44 | ; |
| 45 | return (uint8_t) out; |
| 46 | } |
| 47 | |
| 48 | static int fu740_spi_xfer(const struct spi_slave *slave, |
| 49 | const void *dout, size_t bytesout, |
| 50 | void *din, size_t bytesin) |
| 51 | { |
| 52 | printk(BIOS_DEBUG, "%s 0, bytesin: %zu, bytesout: %zu, din: %p\n", __func__, bytesin, bytesout, din); |
| 53 | hexdump(dout, bytesout); |
| 54 | struct fu740_spi_ctrl *spictrl_reg = fu740_spi_ctrls[slave->bus]; |
| 55 | union fu740_spi_reg_fmt fmt; |
| 56 | fmt.raw_bits = read32(&spictrl_reg->fmt.raw_bits); |
| 57 | if (fmt.proto == FU740_SPI_PROTO_S) { |
| 58 | // working in full-duplex mode |
| 59 | // receiving data needs to be triggered by sending data |
| 60 | while (bytesout || bytesin) { |
| 61 | uint8_t in, out = 0; |
| 62 | if (bytesout) { |
| 63 | out = *(uint8_t *)dout++; |
| 64 | bytesout--; |
| 65 | } |
| 66 | fu740_spi_tx(spictrl_reg, out); |
| 67 | in = fu740_spi_rx(spictrl_reg); |
| 68 | if (bytesin) { |
| 69 | *(uint8_t *)din++ = in; |
| 70 | bytesin--; |
| 71 | } |
| 72 | } |
| 73 | } else { |
| 74 | // Working in half duplex |
| 75 | // send and receive can be done separately |
| 76 | if (dout && din) |
| 77 | return -1; |
| 78 | |
| 79 | if (dout) { |
| 80 | while (bytesout) { |
| 81 | fu740_spi_tx(spictrl_reg, *(uint8_t *)dout++); |
| 82 | bytesout--; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | if (din) { |
| 87 | while (bytesin) { |
| 88 | *(uint8_t *)din++ = fu740_spi_rx(spictrl_reg); |
| 89 | bytesin--; |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | static int fu740_spi_claim_bus(const struct spi_slave *slave) |
| 97 | { |
| 98 | struct fu740_spi_ctrl *spictrl = fu740_spi_ctrls[slave->bus]; |
| 99 | union fu740_spi_reg_csmode csmode; |
| 100 | csmode.raw_bits = 0; |
| 101 | csmode.mode = FU740_SPI_CSMODE_HOLD; |
| 102 | write32(&spictrl->csmode.raw_bits, csmode.raw_bits); |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | static void fu740_spi_release_bus(const struct spi_slave *slave) |
| 107 | { |
| 108 | struct fu740_spi_ctrl *spictrl = fu740_spi_ctrls[slave->bus]; |
| 109 | union fu740_spi_reg_csmode csmode; |
| 110 | csmode.raw_bits = 0; |
| 111 | csmode.mode = FU740_SPI_CSMODE_OFF; |
| 112 | write32(&spictrl->csmode.raw_bits, csmode.raw_bits); |
| 113 | } |
| 114 | |
| 115 | // reset spi flash chip |
| 116 | static void fu740_spi_reset(volatile struct fu740_spi_ctrl *spictrl_reg) |
| 117 | { |
| 118 | fu740_spi_tx(spictrl_reg, 0x66); |
| 119 | fu740_spi_tx(spictrl_reg, 0x99); |
| 120 | } |
| 121 | |
| 122 | // setup the ffmt (SPI flash instruction format) register |
| 123 | __maybe_unused static int fu740_spi_setup_ffmt(volatile struct fu740_spi_ctrl *spictrl_reg, |
| 124 | const struct fu740_spi_config *config) |
| 125 | { |
| 126 | //union fu740_spi_reg_fctrl fctrl; |
| 127 | union fu740_spi_reg_ffmt ffmt; |
| 128 | |
| 129 | printk(BIOS_DEBUG, "config->data_proto: %d, config->cmd_code: %d\n", |
| 130 | config->ffmt_config.data_proto, |
| 131 | config->ffmt_config.cmd_code); |
| 132 | |
| 133 | //TODO test without this here |
| 134 | fu740_spi_reset(spictrl_reg); |
| 135 | |
| 136 | ffmt.raw_bits = 0; |
| 137 | ffmt.cmd_en = 1; // enable sending of command |
| 138 | ffmt.addr_len = 3; // number of address bytes (0-4) |
| 139 | ffmt.pad_cnt = 0; // number of dummy cycles TODO maybe not working |
| 140 | ffmt.cmd_proto = FU740_SPI_PROTO_S; // protocol for transmitting command |
| 141 | ffmt.addr_proto = FU740_SPI_PROTO_S; // protocol for transmitting address and padding |
| 142 | ffmt.data_proto = config->ffmt_config.data_proto; // protocol for receiving data bytes |
| 143 | ffmt.cmd_code = config->ffmt_config.cmd_code; // value of command byte |
| 144 | ffmt.pad_code = 0; // First 8 bits to transmit during dummy cycles |
| 145 | write32(&spictrl_reg->ffmt.raw_bits, ffmt.raw_bits); |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | int fu740_spi_setup(const struct spi_slave *slave) |
| 151 | { |
| 152 | union fu740_spi_reg_csmode csmode; |
| 153 | union fu740_spi_reg_fctrl fctrl; |
| 154 | |
| 155 | struct fu740_spi_ctrl *spictrl_reg = fu740_spi_ctrls[slave->bus]; |
| 156 | struct fu740_spi_config *config = &fu740_spi_configs[slave->bus]; |
| 157 | |
| 158 | if ((config->pha > 1) |
| 159 | || (config->pol > 1) |
| 160 | || (config->fmt_config.protocol > 2) |
| 161 | || (config->fmt_config.endianness > 1) |
| 162 | || (config->fmt_config.bits_per_frame > 8)) |
| 163 | return -1; |
| 164 | |
| 165 | write32(&spictrl_reg->sckdiv, fu740_spi_min_clk_divisor(clock_get_pclk(), config->freq)); |
| 166 | |
| 167 | /* disable direct memory-mapped spi flash mode */ |
| 168 | //TODO test if we need to disable it before changing the settings |
| 169 | fctrl.raw_bits = 0; |
| 170 | fctrl.en = 0; |
| 171 | write32(&spictrl_reg->fctrl.raw_bits, fctrl.raw_bits); |
| 172 | |
| 173 | csmode.raw_bits = 0; |
| 174 | csmode.mode = FU740_SPI_CSMODE_HOLD; |
| 175 | write32(&spictrl_reg->csmode.raw_bits, csmode.raw_bits); |
| 176 | char din[10]; |
| 177 | char dout[10] = { 0x66 }; |
| 178 | slave->ctrlr->xfer(slave, dout, 1, din, 0); |
| 179 | dout[0] = 0x99; |
| 180 | slave->ctrlr->xfer(slave, dout, 1, din, 0); |
| 181 | int addr = 0x200; |
| 182 | dout[0] = 0x03; |
| 183 | dout[1] = (addr >> 16) & 0xFF; |
| 184 | dout[2] = (addr >> 8) & 0xFF; |
| 185 | dout[3] = addr & 0xFF; |
| 186 | slave->ctrlr->xfer(slave, dout, 4, din, 10); |
| 187 | csmode.mode = FU740_SPI_CSMODE_AUTO; |
| 188 | write32(&spictrl_reg->csmode.raw_bits, csmode.raw_bits); |
| 189 | din[9] = 0; |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | struct spi_ctrlr fu740_spi_ctrlr = { |
| 194 | .xfer = fu740_spi_xfer, |
| 195 | .setup = fu740_spi_setup, |
| 196 | .claim_bus = fu740_spi_claim_bus, |
| 197 | .release_bus = fu740_spi_release_bus, |
| 198 | .max_xfer_size = SPI_CTRLR_DEFAULT_MAX_XFER_SIZE, |
| 199 | }; |
| 200 | |
| 201 | const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = { |
| 202 | { |
| 203 | .bus_start = 0, |
| 204 | .bus_end = 2, |
| 205 | .ctrlr = &fu740_spi_ctrlr, |
| 206 | } |
| 207 | }; |
| 208 | |
| 209 | const size_t spi_ctrlr_bus_map_count = ARRAY_SIZE(spi_ctrlr_bus_map); |