Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2017 Whitebox Systems / Northend Systems B.V. |
| 3 | * S.J.R. van Schaik <stephan@whiteboxsystems.nl> |
| 4 | * M.B.W. Wajer <merlijn@whiteboxsystems.nl> |
| 5 | * |
| 6 | * (C) Copyright 2017 Olimex Ltd.. |
| 7 | * Stefan Mavrodiev <stefan@olimex.com> |
| 8 | * |
| 9 | * Based on linux spi driver. Original copyright follows: |
| 10 | * linux/drivers/spi/spi-sun4i.c |
| 11 | * |
| 12 | * Copyright (C) 2012 - 2014 Allwinner Tech |
| 13 | * Pan Nan <pannan@allwinnertech.com> |
| 14 | * |
| 15 | * Copyright (C) 2014 Maxime Ripard |
| 16 | * Maxime Ripard <maxime.ripard@free-electrons.com> |
| 17 | * |
| 18 | * SPDX-License-Identifier: GPL-2.0+ |
| 19 | */ |
| 20 | |
| 21 | #include <common.h> |
Jagan Teki | 8d71a19 | 2019-02-27 20:02:10 +0530 | [diff] [blame^] | 22 | #include <clk.h> |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 23 | #include <dm.h> |
| 24 | #include <spi.h> |
| 25 | #include <errno.h> |
| 26 | #include <fdt_support.h> |
| 27 | #include <wait_bit.h> |
| 28 | |
| 29 | #include <asm/bitops.h> |
| 30 | #include <asm/gpio.h> |
| 31 | #include <asm/io.h> |
| 32 | |
Jagan Teki | 6cb6aa6 | 2019-02-27 20:02:05 +0530 | [diff] [blame] | 33 | #include <linux/iopoll.h> |
| 34 | |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 35 | #define SUN4I_RXDATA_REG 0x00 |
| 36 | |
| 37 | #define SUN4I_TXDATA_REG 0x04 |
| 38 | |
| 39 | #define SUN4I_CTL_REG 0x08 |
| 40 | #define SUN4I_CTL_ENABLE BIT(0) |
| 41 | #define SUN4I_CTL_MASTER BIT(1) |
| 42 | #define SUN4I_CTL_CPHA BIT(2) |
| 43 | #define SUN4I_CTL_CPOL BIT(3) |
| 44 | #define SUN4I_CTL_CS_ACTIVE_LOW BIT(4) |
| 45 | #define SUN4I_CTL_LMTF BIT(6) |
| 46 | #define SUN4I_CTL_TF_RST BIT(8) |
| 47 | #define SUN4I_CTL_RF_RST BIT(9) |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 48 | #define SUN4I_CTL_XCH BIT(10) |
| 49 | #define SUN4I_CTL_CS_MASK 0x3000 |
| 50 | #define SUN4I_CTL_CS(cs) (((cs) << 12) & SUN4I_CTL_CS_MASK) |
| 51 | #define SUN4I_CTL_DHB BIT(15) |
| 52 | #define SUN4I_CTL_CS_MANUAL BIT(16) |
| 53 | #define SUN4I_CTL_CS_LEVEL BIT(17) |
| 54 | #define SUN4I_CTL_TP BIT(18) |
| 55 | |
| 56 | #define SUN4I_INT_CTL_REG 0x0c |
| 57 | #define SUN4I_INT_CTL_RF_F34 BIT(4) |
| 58 | #define SUN4I_INT_CTL_TF_E34 BIT(12) |
| 59 | #define SUN4I_INT_CTL_TC BIT(16) |
| 60 | |
| 61 | #define SUN4I_INT_STA_REG 0x10 |
| 62 | |
| 63 | #define SUN4I_DMA_CTL_REG 0x14 |
| 64 | |
| 65 | #define SUN4I_WAIT_REG 0x18 |
| 66 | |
| 67 | #define SUN4I_CLK_CTL_REG 0x1c |
| 68 | #define SUN4I_CLK_CTL_CDR2_MASK 0xff |
| 69 | #define SUN4I_CLK_CTL_CDR2(div) ((div) & SUN4I_CLK_CTL_CDR2_MASK) |
| 70 | #define SUN4I_CLK_CTL_CDR1_MASK 0xf |
| 71 | #define SUN4I_CLK_CTL_CDR1(div) (((div) & SUN4I_CLK_CTL_CDR1_MASK) << 8) |
| 72 | #define SUN4I_CLK_CTL_DRS BIT(12) |
| 73 | |
| 74 | #define SUN4I_MAX_XFER_SIZE 0xffffff |
| 75 | |
| 76 | #define SUN4I_BURST_CNT_REG 0x20 |
| 77 | #define SUN4I_BURST_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE) |
| 78 | |
| 79 | #define SUN4I_XMIT_CNT_REG 0x24 |
| 80 | #define SUN4I_XMIT_CNT(cnt) ((cnt) & SUN4I_MAX_XFER_SIZE) |
| 81 | |
| 82 | #define SUN4I_FIFO_STA_REG 0x28 |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 83 | #define SUN4I_FIFO_STA_RF_CNT_BITS 0 |
| 84 | #define SUN4I_FIFO_STA_TF_CNT_MASK 0x7f |
| 85 | #define SUN4I_FIFO_STA_TF_CNT_BITS 16 |
| 86 | |
| 87 | #define SUN4I_SPI_MAX_RATE 24000000 |
| 88 | #define SUN4I_SPI_MIN_RATE 3000 |
| 89 | #define SUN4I_SPI_DEFAULT_RATE 1000000 |
| 90 | #define SUN4I_SPI_TIMEOUT_US 1000000 |
| 91 | |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 92 | #define SPI_REG(priv, reg) ((priv)->base_addr + \ |
| 93 | (priv)->variant->regs[reg]) |
| 94 | #define SPI_BIT(priv, bit) ((priv)->variant->bits[bit]) |
| 95 | #define SPI_CS(priv, cs) (((cs) << SPI_BIT(priv, SPI_TCR_CS_SEL)) & \ |
| 96 | SPI_BIT(priv, SPI_TCR_CS_MASK)) |
| 97 | |
| 98 | /* sun spi register set */ |
| 99 | enum sun4i_spi_regs { |
| 100 | SPI_GCR, |
| 101 | SPI_TCR, |
| 102 | SPI_FCR, |
| 103 | SPI_FSR, |
| 104 | SPI_CCR, |
| 105 | SPI_BC, |
| 106 | SPI_TC, |
| 107 | SPI_BCTL, |
| 108 | SPI_TXD, |
| 109 | SPI_RXD, |
| 110 | }; |
| 111 | |
| 112 | /* sun spi register bits */ |
| 113 | enum sun4i_spi_bits { |
| 114 | SPI_GCR_TP, |
| 115 | SPI_TCR_CPHA, |
| 116 | SPI_TCR_CPOL, |
| 117 | SPI_TCR_CS_ACTIVE_LOW, |
| 118 | SPI_TCR_CS_SEL, |
| 119 | SPI_TCR_CS_MASK, |
| 120 | SPI_TCR_XCH, |
| 121 | SPI_TCR_CS_MANUAL, |
| 122 | SPI_TCR_CS_LEVEL, |
| 123 | SPI_FCR_TF_RST, |
| 124 | SPI_FCR_RF_RST, |
| 125 | SPI_FSR_RF_CNT_MASK, |
| 126 | }; |
| 127 | |
| 128 | struct sun4i_spi_variant { |
| 129 | const unsigned long *regs; |
| 130 | const u32 *bits; |
Jagan Teki | 178fbd2 | 2019-02-27 20:02:09 +0530 | [diff] [blame] | 131 | u32 fifo_depth; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 132 | }; |
| 133 | |
| 134 | struct sun4i_spi_platdata { |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 135 | struct sun4i_spi_variant *variant; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 136 | u32 base_addr; |
| 137 | u32 max_hz; |
| 138 | }; |
| 139 | |
| 140 | struct sun4i_spi_priv { |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 141 | struct sun4i_spi_variant *variant; |
Jagan Teki | 8d71a19 | 2019-02-27 20:02:10 +0530 | [diff] [blame^] | 142 | struct clk clk_ahb, clk_mod; |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 143 | u32 base_addr; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 144 | u32 freq; |
| 145 | u32 mode; |
| 146 | |
| 147 | const u8 *tx_buf; |
| 148 | u8 *rx_buf; |
| 149 | }; |
| 150 | |
| 151 | DECLARE_GLOBAL_DATA_PTR; |
| 152 | |
| 153 | static inline void sun4i_spi_drain_fifo(struct sun4i_spi_priv *priv, int len) |
| 154 | { |
| 155 | u8 byte; |
| 156 | |
| 157 | while (len--) { |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 158 | byte = readb(SPI_REG(priv, SPI_RXD)); |
Stefan Mavrodiev | 5c1a87d | 2018-12-05 14:27:57 +0200 | [diff] [blame] | 159 | if (priv->rx_buf) |
| 160 | *priv->rx_buf++ = byte; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 161 | } |
| 162 | } |
| 163 | |
| 164 | static inline void sun4i_spi_fill_fifo(struct sun4i_spi_priv *priv, int len) |
| 165 | { |
| 166 | u8 byte; |
| 167 | |
| 168 | while (len--) { |
| 169 | byte = priv->tx_buf ? *priv->tx_buf++ : 0; |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 170 | writeb(byte, SPI_REG(priv, SPI_TXD)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 171 | } |
| 172 | } |
| 173 | |
| 174 | static void sun4i_spi_set_cs(struct udevice *bus, u8 cs, bool enable) |
| 175 | { |
| 176 | struct sun4i_spi_priv *priv = dev_get_priv(bus); |
| 177 | u32 reg; |
| 178 | |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 179 | reg = readl(SPI_REG(priv, SPI_TCR)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 180 | |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 181 | reg &= ~SPI_BIT(priv, SPI_TCR_CS_MASK); |
| 182 | reg |= SPI_CS(priv, cs); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 183 | |
| 184 | if (enable) |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 185 | reg &= ~SPI_BIT(priv, SPI_TCR_CS_LEVEL); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 186 | else |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 187 | reg |= SPI_BIT(priv, SPI_TCR_CS_LEVEL); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 188 | |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 189 | writel(reg, SPI_REG(priv, SPI_TCR)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | static int sun4i_spi_parse_pins(struct udevice *dev) |
| 193 | { |
| 194 | const void *fdt = gd->fdt_blob; |
| 195 | const char *pin_name; |
| 196 | const fdt32_t *list; |
| 197 | u32 phandle; |
| 198 | int drive, pull = 0, pin, i; |
| 199 | int offset; |
| 200 | int size; |
| 201 | |
| 202 | list = fdt_getprop(fdt, dev_of_offset(dev), "pinctrl-0", &size); |
| 203 | if (!list) { |
| 204 | printf("WARNING: sun4i_spi: cannot find pinctrl-0 node\n"); |
| 205 | return -EINVAL; |
| 206 | } |
| 207 | |
| 208 | while (size) { |
| 209 | phandle = fdt32_to_cpu(*list++); |
| 210 | size -= sizeof(*list); |
| 211 | |
| 212 | offset = fdt_node_offset_by_phandle(fdt, phandle); |
| 213 | if (offset < 0) |
| 214 | return offset; |
| 215 | |
| 216 | drive = fdt_getprop_u32_default_node(fdt, offset, 0, |
| 217 | "drive-strength", 0); |
| 218 | if (drive) { |
| 219 | if (drive <= 10) |
| 220 | drive = 0; |
| 221 | else if (drive <= 20) |
| 222 | drive = 1; |
| 223 | else if (drive <= 30) |
| 224 | drive = 2; |
| 225 | else |
| 226 | drive = 3; |
| 227 | } else { |
| 228 | drive = fdt_getprop_u32_default_node(fdt, offset, 0, |
| 229 | "allwinner,drive", |
| 230 | 0); |
| 231 | drive = min(drive, 3); |
| 232 | } |
| 233 | |
| 234 | if (fdt_get_property(fdt, offset, "bias-disable", NULL)) |
| 235 | pull = 0; |
| 236 | else if (fdt_get_property(fdt, offset, "bias-pull-up", NULL)) |
| 237 | pull = 1; |
| 238 | else if (fdt_get_property(fdt, offset, "bias-pull-down", NULL)) |
| 239 | pull = 2; |
| 240 | else |
| 241 | pull = fdt_getprop_u32_default_node(fdt, offset, 0, |
| 242 | "allwinner,pull", |
| 243 | 0); |
| 244 | pull = min(pull, 2); |
| 245 | |
| 246 | for (i = 0; ; i++) { |
| 247 | pin_name = fdt_stringlist_get(fdt, offset, |
| 248 | "pins", i, NULL); |
| 249 | if (!pin_name) { |
| 250 | pin_name = fdt_stringlist_get(fdt, offset, |
| 251 | "allwinner,pins", |
| 252 | i, NULL); |
| 253 | if (!pin_name) |
| 254 | break; |
| 255 | } |
| 256 | |
| 257 | pin = name_to_gpio(pin_name); |
| 258 | if (pin < 0) |
| 259 | break; |
| 260 | |
| 261 | sunxi_gpio_set_cfgpin(pin, SUNXI_GPC_SPI0); |
| 262 | sunxi_gpio_set_drv(pin, drive); |
| 263 | sunxi_gpio_set_pull(pin, pull); |
| 264 | } |
| 265 | } |
| 266 | return 0; |
| 267 | } |
| 268 | |
Jagan Teki | 8d71a19 | 2019-02-27 20:02:10 +0530 | [diff] [blame^] | 269 | static inline int sun4i_spi_set_clock(struct udevice *dev, bool enable) |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 270 | { |
Jagan Teki | 8d71a19 | 2019-02-27 20:02:10 +0530 | [diff] [blame^] | 271 | struct sun4i_spi_priv *priv = dev_get_priv(dev); |
| 272 | int ret; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 273 | |
Jagan Teki | 8d71a19 | 2019-02-27 20:02:10 +0530 | [diff] [blame^] | 274 | if (!enable) { |
| 275 | clk_disable(&priv->clk_ahb); |
| 276 | clk_disable(&priv->clk_mod); |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | ret = clk_enable(&priv->clk_ahb); |
| 281 | if (ret) { |
| 282 | dev_err(dev, "failed to enable ahb clock (ret=%d)\n", ret); |
| 283 | return ret; |
| 284 | } |
| 285 | |
| 286 | ret = clk_enable(&priv->clk_mod); |
| 287 | if (ret) { |
| 288 | dev_err(dev, "failed to enable mod clock (ret=%d)\n", ret); |
| 289 | goto err_ahb; |
| 290 | } |
| 291 | |
| 292 | return 0; |
| 293 | |
| 294 | err_ahb: |
| 295 | clk_disable(&priv->clk_ahb); |
| 296 | return ret; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | static int sun4i_spi_ofdata_to_platdata(struct udevice *bus) |
| 300 | { |
| 301 | struct sun4i_spi_platdata *plat = dev_get_platdata(bus); |
| 302 | int node = dev_of_offset(bus); |
| 303 | |
| 304 | plat->base_addr = devfdt_get_addr(bus); |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 305 | plat->variant = (struct sun4i_spi_variant *)dev_get_driver_data(bus); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 306 | plat->max_hz = fdtdec_get_int(gd->fdt_blob, node, |
| 307 | "spi-max-frequency", |
| 308 | SUN4I_SPI_DEFAULT_RATE); |
| 309 | |
| 310 | if (plat->max_hz > SUN4I_SPI_MAX_RATE) |
| 311 | plat->max_hz = SUN4I_SPI_MAX_RATE; |
| 312 | |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | static int sun4i_spi_probe(struct udevice *bus) |
| 317 | { |
| 318 | struct sun4i_spi_platdata *plat = dev_get_platdata(bus); |
| 319 | struct sun4i_spi_priv *priv = dev_get_priv(bus); |
Jagan Teki | 8d71a19 | 2019-02-27 20:02:10 +0530 | [diff] [blame^] | 320 | int ret; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 321 | |
Jagan Teki | 8d71a19 | 2019-02-27 20:02:10 +0530 | [diff] [blame^] | 322 | ret = clk_get_by_name(bus, "ahb", &priv->clk_ahb); |
| 323 | if (ret) { |
| 324 | dev_err(dev, "failed to get ahb clock\n"); |
| 325 | return ret; |
| 326 | } |
| 327 | |
| 328 | ret = clk_get_by_name(bus, "mod", &priv->clk_mod); |
| 329 | if (ret) { |
| 330 | dev_err(dev, "failed to get mod clock\n"); |
| 331 | return ret; |
| 332 | } |
| 333 | |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 334 | sun4i_spi_parse_pins(bus); |
| 335 | |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 336 | priv->variant = plat->variant; |
| 337 | priv->base_addr = plat->base_addr; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 338 | priv->freq = plat->max_hz; |
| 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | static int sun4i_spi_claim_bus(struct udevice *dev) |
| 344 | { |
| 345 | struct sun4i_spi_priv *priv = dev_get_priv(dev->parent); |
Jagan Teki | 8d71a19 | 2019-02-27 20:02:10 +0530 | [diff] [blame^] | 346 | int ret; |
| 347 | |
| 348 | ret = sun4i_spi_set_clock(dev->parent, true); |
| 349 | if (ret) |
| 350 | return ret; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 351 | |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 352 | setbits_le32(SPI_REG(priv, SPI_GCR), SUN4I_CTL_ENABLE | |
| 353 | SUN4I_CTL_MASTER | SPI_BIT(priv, SPI_GCR_TP)); |
| 354 | |
| 355 | setbits_le32(SPI_REG(priv, SPI_TCR), SPI_BIT(priv, SPI_TCR_CS_MANUAL) | |
| 356 | SPI_BIT(priv, SPI_TCR_CS_ACTIVE_LOW)); |
Jagan Teki | 8cbf09b | 2019-02-27 20:02:07 +0530 | [diff] [blame] | 357 | |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | static int sun4i_spi_release_bus(struct udevice *dev) |
| 362 | { |
| 363 | struct sun4i_spi_priv *priv = dev_get_priv(dev->parent); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 364 | |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 365 | clrbits_le32(SPI_REG(priv, SPI_GCR), SUN4I_CTL_ENABLE); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 366 | |
Jagan Teki | 8d71a19 | 2019-02-27 20:02:10 +0530 | [diff] [blame^] | 367 | sun4i_spi_set_clock(dev->parent, false); |
| 368 | |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | static int sun4i_spi_xfer(struct udevice *dev, unsigned int bitlen, |
| 373 | const void *dout, void *din, unsigned long flags) |
| 374 | { |
| 375 | struct udevice *bus = dev->parent; |
| 376 | struct sun4i_spi_priv *priv = dev_get_priv(bus); |
| 377 | struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev); |
| 378 | |
| 379 | u32 len = bitlen / 8; |
Jagan Teki | 8cbf09b | 2019-02-27 20:02:07 +0530 | [diff] [blame] | 380 | u32 rx_fifocnt; |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 381 | u8 nbytes; |
| 382 | int ret; |
| 383 | |
| 384 | priv->tx_buf = dout; |
| 385 | priv->rx_buf = din; |
| 386 | |
| 387 | if (bitlen % 8) { |
| 388 | debug("%s: non byte-aligned SPI transfer.\n", __func__); |
| 389 | return -ENAVAIL; |
| 390 | } |
| 391 | |
| 392 | if (flags & SPI_XFER_BEGIN) |
| 393 | sun4i_spi_set_cs(bus, slave_plat->cs, true); |
| 394 | |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 395 | /* Reset FIFOs */ |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 396 | setbits_le32(SPI_REG(priv, SPI_FCR), SPI_BIT(priv, SPI_FCR_RF_RST) | |
| 397 | SPI_BIT(priv, SPI_FCR_TF_RST)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 398 | |
| 399 | while (len) { |
| 400 | /* Setup the transfer now... */ |
Jagan Teki | 178fbd2 | 2019-02-27 20:02:09 +0530 | [diff] [blame] | 401 | nbytes = min(len, (priv->variant->fifo_depth - 1)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 402 | |
| 403 | /* Setup the counters */ |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 404 | writel(SUN4I_BURST_CNT(nbytes), SPI_REG(priv, SPI_BC)); |
| 405 | writel(SUN4I_XMIT_CNT(nbytes), SPI_REG(priv, SPI_TC)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 406 | |
| 407 | /* Fill the TX FIFO */ |
| 408 | sun4i_spi_fill_fifo(priv, nbytes); |
| 409 | |
| 410 | /* Start the transfer */ |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 411 | setbits_le32(SPI_REG(priv, SPI_TCR), |
| 412 | SPI_BIT(priv, SPI_TCR_XCH)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 413 | |
Jagan Teki | 6cb6aa6 | 2019-02-27 20:02:05 +0530 | [diff] [blame] | 414 | /* Wait till RX FIFO to be empty */ |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 415 | ret = readl_poll_timeout(SPI_REG(priv, SPI_FSR), |
| 416 | rx_fifocnt, |
| 417 | (((rx_fifocnt & |
| 418 | SPI_BIT(priv, SPI_FSR_RF_CNT_MASK)) >> |
Jagan Teki | 6cb6aa6 | 2019-02-27 20:02:05 +0530 | [diff] [blame] | 419 | SUN4I_FIFO_STA_RF_CNT_BITS) >= nbytes), |
| 420 | SUN4I_SPI_TIMEOUT_US); |
| 421 | if (ret < 0) { |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 422 | printf("ERROR: sun4i_spi: Timeout transferring data\n"); |
| 423 | sun4i_spi_set_cs(bus, slave_plat->cs, false); |
| 424 | return ret; |
| 425 | } |
| 426 | |
| 427 | /* Drain the RX FIFO */ |
| 428 | sun4i_spi_drain_fifo(priv, nbytes); |
| 429 | |
| 430 | len -= nbytes; |
| 431 | } |
| 432 | |
| 433 | if (flags & SPI_XFER_END) |
| 434 | sun4i_spi_set_cs(bus, slave_plat->cs, false); |
| 435 | |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | static int sun4i_spi_set_speed(struct udevice *dev, uint speed) |
| 440 | { |
| 441 | struct sun4i_spi_platdata *plat = dev_get_platdata(dev); |
| 442 | struct sun4i_spi_priv *priv = dev_get_priv(dev); |
| 443 | unsigned int div; |
| 444 | u32 reg; |
| 445 | |
| 446 | if (speed > plat->max_hz) |
| 447 | speed = plat->max_hz; |
| 448 | |
| 449 | if (speed < SUN4I_SPI_MIN_RATE) |
| 450 | speed = SUN4I_SPI_MIN_RATE; |
| 451 | /* |
| 452 | * Setup clock divider. |
| 453 | * |
| 454 | * We have two choices there. Either we can use the clock |
| 455 | * divide rate 1, which is calculated thanks to this formula: |
| 456 | * SPI_CLK = MOD_CLK / (2 ^ (cdr + 1)) |
| 457 | * Or we can use CDR2, which is calculated with the formula: |
| 458 | * SPI_CLK = MOD_CLK / (2 * (cdr + 1)) |
| 459 | * Whether we use the former or the latter is set through the |
| 460 | * DRS bit. |
| 461 | * |
| 462 | * First try CDR2, and if we can't reach the expected |
| 463 | * frequency, fall back to CDR1. |
| 464 | */ |
| 465 | |
| 466 | div = SUN4I_SPI_MAX_RATE / (2 * speed); |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 467 | reg = readl(SPI_REG(priv, SPI_CCR)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 468 | |
| 469 | if (div <= (SUN4I_CLK_CTL_CDR2_MASK + 1)) { |
| 470 | if (div > 0) |
| 471 | div--; |
| 472 | |
| 473 | reg &= ~(SUN4I_CLK_CTL_CDR2_MASK | SUN4I_CLK_CTL_DRS); |
| 474 | reg |= SUN4I_CLK_CTL_CDR2(div) | SUN4I_CLK_CTL_DRS; |
| 475 | } else { |
| 476 | div = __ilog2(SUN4I_SPI_MAX_RATE) - __ilog2(speed); |
| 477 | reg &= ~((SUN4I_CLK_CTL_CDR1_MASK << 8) | SUN4I_CLK_CTL_DRS); |
| 478 | reg |= SUN4I_CLK_CTL_CDR1(div); |
| 479 | } |
| 480 | |
| 481 | priv->freq = speed; |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 482 | writel(reg, SPI_REG(priv, SPI_CCR)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 483 | |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | static int sun4i_spi_set_mode(struct udevice *dev, uint mode) |
| 488 | { |
| 489 | struct sun4i_spi_priv *priv = dev_get_priv(dev); |
| 490 | u32 reg; |
| 491 | |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 492 | reg = readl(SPI_REG(priv, SPI_TCR)); |
| 493 | reg &= ~(SPI_BIT(priv, SPI_TCR_CPOL) | SPI_BIT(priv, SPI_TCR_CPHA)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 494 | |
| 495 | if (mode & SPI_CPOL) |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 496 | reg |= SPI_BIT(priv, SPI_TCR_CPOL); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 497 | |
| 498 | if (mode & SPI_CPHA) |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 499 | reg |= SPI_BIT(priv, SPI_TCR_CPHA); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 500 | |
| 501 | priv->mode = mode; |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 502 | writel(reg, SPI_REG(priv, SPI_TCR)); |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 503 | |
| 504 | return 0; |
| 505 | } |
| 506 | |
| 507 | static const struct dm_spi_ops sun4i_spi_ops = { |
| 508 | .claim_bus = sun4i_spi_claim_bus, |
| 509 | .release_bus = sun4i_spi_release_bus, |
| 510 | .xfer = sun4i_spi_xfer, |
| 511 | .set_speed = sun4i_spi_set_speed, |
| 512 | .set_mode = sun4i_spi_set_mode, |
| 513 | }; |
| 514 | |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 515 | static const unsigned long sun4i_spi_regs[] = { |
| 516 | [SPI_GCR] = SUN4I_CTL_REG, |
| 517 | [SPI_TCR] = SUN4I_CTL_REG, |
| 518 | [SPI_FCR] = SUN4I_CTL_REG, |
| 519 | [SPI_FSR] = SUN4I_FIFO_STA_REG, |
| 520 | [SPI_CCR] = SUN4I_CLK_CTL_REG, |
| 521 | [SPI_BC] = SUN4I_BURST_CNT_REG, |
| 522 | [SPI_TC] = SUN4I_XMIT_CNT_REG, |
| 523 | [SPI_TXD] = SUN4I_TXDATA_REG, |
| 524 | [SPI_RXD] = SUN4I_RXDATA_REG, |
| 525 | }; |
| 526 | |
| 527 | static const u32 sun4i_spi_bits[] = { |
| 528 | [SPI_GCR_TP] = BIT(18), |
| 529 | [SPI_TCR_CPHA] = BIT(2), |
| 530 | [SPI_TCR_CPOL] = BIT(3), |
| 531 | [SPI_TCR_CS_ACTIVE_LOW] = BIT(4), |
| 532 | [SPI_TCR_XCH] = BIT(10), |
| 533 | [SPI_TCR_CS_SEL] = 12, |
| 534 | [SPI_TCR_CS_MASK] = 0x3000, |
| 535 | [SPI_TCR_CS_MANUAL] = BIT(16), |
| 536 | [SPI_TCR_CS_LEVEL] = BIT(17), |
| 537 | [SPI_FCR_TF_RST] = BIT(8), |
| 538 | [SPI_FCR_RF_RST] = BIT(9), |
| 539 | [SPI_FSR_RF_CNT_MASK] = GENMASK(6, 0), |
| 540 | }; |
| 541 | |
| 542 | static const struct sun4i_spi_variant sun4i_a10_spi_variant = { |
| 543 | .regs = sun4i_spi_regs, |
| 544 | .bits = sun4i_spi_bits, |
Jagan Teki | 178fbd2 | 2019-02-27 20:02:09 +0530 | [diff] [blame] | 545 | .fifo_depth = 64, |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 546 | }; |
| 547 | |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 548 | static const struct udevice_id sun4i_spi_ids[] = { |
Jagan Teki | 8d9bf46 | 2019-02-27 20:02:08 +0530 | [diff] [blame] | 549 | { |
| 550 | .compatible = "allwinner,sun4i-a10-spi", |
| 551 | .data = (ulong)&sun4i_a10_spi_variant, |
| 552 | }, |
Stefan Mavrodiev | 7f25d81 | 2018-02-06 15:14:33 +0200 | [diff] [blame] | 553 | { } |
| 554 | }; |
| 555 | |
| 556 | U_BOOT_DRIVER(sun4i_spi) = { |
| 557 | .name = "sun4i_spi", |
| 558 | .id = UCLASS_SPI, |
| 559 | .of_match = sun4i_spi_ids, |
| 560 | .ops = &sun4i_spi_ops, |
| 561 | .ofdata_to_platdata = sun4i_spi_ofdata_to_platdata, |
| 562 | .platdata_auto_alloc_size = sizeof(struct sun4i_spi_platdata), |
| 563 | .priv_auto_alloc_size = sizeof(struct sun4i_spi_priv), |
| 564 | .probe = sun4i_spi_probe, |
| 565 | }; |