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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 | // SPDX-License-Identifier: GPL-2.0-only /* * Low-level I/O functions. * * Copyright (c) 2017-2020, Silicon Laboratories, Inc. * Copyright (c) 2010, ST-Ericsson */ #include <linux/kernel.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/align.h> #include "hwio.h" #include "wfx.h" #include "bus.h" #include "traces.h" #define WFX_HIF_BUFFER_SIZE 0x2000 static int wfx_read32(struct wfx_dev *wdev, int reg, u32 *val) { int ret; __le32 *tmp = kmalloc(sizeof(u32), GFP_KERNEL); *val = ~0; /* Never return undefined value */ if (!tmp) return -ENOMEM; ret = wdev->hwbus_ops->copy_from_io(wdev->hwbus_priv, reg, tmp, sizeof(u32)); if (ret >= 0) *val = le32_to_cpu(*tmp); kfree(tmp); if (ret) dev_err(wdev->dev, "%s: bus communication error: %d\n", __func__, ret); return ret; } static int wfx_write32(struct wfx_dev *wdev, int reg, u32 val) { int ret; __le32 *tmp = kmalloc(sizeof(u32), GFP_KERNEL); if (!tmp) return -ENOMEM; *tmp = cpu_to_le32(val); ret = wdev->hwbus_ops->copy_to_io(wdev->hwbus_priv, reg, tmp, sizeof(u32)); kfree(tmp); if (ret) dev_err(wdev->dev, "%s: bus communication error: %d\n", __func__, ret); return ret; } static int wfx_read32_locked(struct wfx_dev *wdev, int reg, u32 *val) { int ret; wdev->hwbus_ops->lock(wdev->hwbus_priv); ret = wfx_read32(wdev, reg, val); _trace_io_read32(reg, *val); wdev->hwbus_ops->unlock(wdev->hwbus_priv); return ret; } static int wfx_write32_locked(struct wfx_dev *wdev, int reg, u32 val) { int ret; wdev->hwbus_ops->lock(wdev->hwbus_priv); ret = wfx_write32(wdev, reg, val); _trace_io_write32(reg, val); wdev->hwbus_ops->unlock(wdev->hwbus_priv); return ret; } static int wfx_write32_bits_locked(struct wfx_dev *wdev, int reg, u32 mask, u32 val) { int ret; u32 val_r, val_w; WARN_ON(~mask & val); val &= mask; wdev->hwbus_ops->lock(wdev->hwbus_priv); ret = wfx_read32(wdev, reg, &val_r); _trace_io_read32(reg, val_r); if (ret < 0) goto err; val_w = (val_r & ~mask) | val; if (val_w != val_r) { ret = wfx_write32(wdev, reg, val_w); _trace_io_write32(reg, val_w); } err: wdev->hwbus_ops->unlock(wdev->hwbus_priv); return ret; } static int wfx_indirect_read(struct wfx_dev *wdev, int reg, u32 addr, void *buf, size_t len) { int ret; int i; u32 cfg; u32 prefetch; WARN_ON(len >= WFX_HIF_BUFFER_SIZE); WARN_ON(reg != WFX_REG_AHB_DPORT && reg != WFX_REG_SRAM_DPORT); if (reg == WFX_REG_AHB_DPORT) prefetch = CFG_PREFETCH_AHB; else if (reg == WFX_REG_SRAM_DPORT) prefetch = CFG_PREFETCH_SRAM; else return -ENODEV; ret = wfx_write32(wdev, WFX_REG_BASE_ADDR, addr); if (ret < 0) goto err; ret = wfx_read32(wdev, WFX_REG_CONFIG, &cfg); if (ret < 0) goto err; ret = wfx_write32(wdev, WFX_REG_CONFIG, cfg | prefetch); if (ret < 0) goto err; for (i = 0; i < 20; i++) { ret = wfx_read32(wdev, WFX_REG_CONFIG, &cfg); if (ret < 0) goto err; if (!(cfg & prefetch)) break; usleep_range(200, 250); } if (i == 20) { ret = -ETIMEDOUT; goto err; } ret = wdev->hwbus_ops->copy_from_io(wdev->hwbus_priv, reg, buf, len); err: if (ret < 0) memset(buf, 0xFF, len); /* Never return undefined value */ return ret; } static int wfx_indirect_write(struct wfx_dev *wdev, int reg, u32 addr, const void *buf, size_t len) { int ret; WARN_ON(len >= WFX_HIF_BUFFER_SIZE); WARN_ON(reg != WFX_REG_AHB_DPORT && reg != WFX_REG_SRAM_DPORT); ret = wfx_write32(wdev, WFX_REG_BASE_ADDR, addr); if (ret < 0) return ret; return wdev->hwbus_ops->copy_to_io(wdev->hwbus_priv, reg, buf, len); } static int wfx_indirect_read_locked(struct wfx_dev *wdev, int reg, u32 addr, void *buf, size_t len) { int ret; wdev->hwbus_ops->lock(wdev->hwbus_priv); ret = wfx_indirect_read(wdev, reg, addr, buf, len); _trace_io_ind_read(reg, addr, buf, len); wdev->hwbus_ops->unlock(wdev->hwbus_priv); return ret; } static int wfx_indirect_write_locked(struct wfx_dev *wdev, int reg, u32 addr, const void *buf, size_t len) { int ret; wdev->hwbus_ops->lock(wdev->hwbus_priv); ret = wfx_indirect_write(wdev, reg, addr, buf, len); _trace_io_ind_write(reg, addr, buf, len); wdev->hwbus_ops->unlock(wdev->hwbus_priv); return ret; } static int wfx_indirect_read32_locked(struct wfx_dev *wdev, int reg, u32 addr, u32 *val) { int ret; __le32 *tmp = kmalloc(sizeof(u32), GFP_KERNEL); if (!tmp) return -ENOMEM; wdev->hwbus_ops->lock(wdev->hwbus_priv); ret = wfx_indirect_read(wdev, reg, addr, tmp, sizeof(u32)); *val = le32_to_cpu(*tmp); _trace_io_ind_read32(reg, addr, *val); wdev->hwbus_ops->unlock(wdev->hwbus_priv); kfree(tmp); return ret; } static int wfx_indirect_write32_locked(struct wfx_dev *wdev, int reg, u32 addr, u32 val) { int ret; __le32 *tmp = kmalloc(sizeof(u32), GFP_KERNEL); if (!tmp) return -ENOMEM; *tmp = cpu_to_le32(val); wdev->hwbus_ops->lock(wdev->hwbus_priv); ret = wfx_indirect_write(wdev, reg, addr, tmp, sizeof(u32)); _trace_io_ind_write32(reg, addr, val); wdev->hwbus_ops->unlock(wdev->hwbus_priv); kfree(tmp); return ret; } int wfx_data_read(struct wfx_dev *wdev, void *buf, size_t len) { int ret; WARN(!IS_ALIGNED((uintptr_t)buf, 4), "unaligned buffer"); wdev->hwbus_ops->lock(wdev->hwbus_priv); ret = wdev->hwbus_ops->copy_from_io(wdev->hwbus_priv, WFX_REG_IN_OUT_QUEUE, buf, len); _trace_io_read(WFX_REG_IN_OUT_QUEUE, buf, len); wdev->hwbus_ops->unlock(wdev->hwbus_priv); if (ret) dev_err(wdev->dev, "%s: bus communication error: %d\n", __func__, ret); return ret; } int wfx_data_write(struct wfx_dev *wdev, const void *buf, size_t len) { int ret; WARN(!IS_ALIGNED((uintptr_t)buf, 4), "unaligned buffer"); wdev->hwbus_ops->lock(wdev->hwbus_priv); ret = wdev->hwbus_ops->copy_to_io(wdev->hwbus_priv, WFX_REG_IN_OUT_QUEUE, buf, len); _trace_io_write(WFX_REG_IN_OUT_QUEUE, buf, len); wdev->hwbus_ops->unlock(wdev->hwbus_priv); if (ret) dev_err(wdev->dev, "%s: bus communication error: %d\n", __func__, ret); return ret; } int wfx_sram_buf_read(struct wfx_dev *wdev, u32 addr, void *buf, size_t len) { return wfx_indirect_read_locked(wdev, WFX_REG_SRAM_DPORT, addr, buf, len); } int wfx_ahb_buf_read(struct wfx_dev *wdev, u32 addr, void *buf, size_t len) { return wfx_indirect_read_locked(wdev, WFX_REG_AHB_DPORT, addr, buf, len); } int wfx_sram_buf_write(struct wfx_dev *wdev, u32 addr, const void *buf, size_t len) { return wfx_indirect_write_locked(wdev, WFX_REG_SRAM_DPORT, addr, buf, len); } int wfx_ahb_buf_write(struct wfx_dev *wdev, u32 addr, const void *buf, size_t len) { return wfx_indirect_write_locked(wdev, WFX_REG_AHB_DPORT, addr, buf, len); } int wfx_sram_reg_read(struct wfx_dev *wdev, u32 addr, u32 *val) { return wfx_indirect_read32_locked(wdev, WFX_REG_SRAM_DPORT, addr, val); } int wfx_ahb_reg_read(struct wfx_dev *wdev, u32 addr, u32 *val) { return wfx_indirect_read32_locked(wdev, WFX_REG_AHB_DPORT, addr, val); } int wfx_sram_reg_write(struct wfx_dev *wdev, u32 addr, u32 val) { return wfx_indirect_write32_locked(wdev, WFX_REG_SRAM_DPORT, addr, val); } int wfx_ahb_reg_write(struct wfx_dev *wdev, u32 addr, u32 val) { return wfx_indirect_write32_locked(wdev, WFX_REG_AHB_DPORT, addr, val); } int wfx_config_reg_read(struct wfx_dev *wdev, u32 *val) { return wfx_read32_locked(wdev, WFX_REG_CONFIG, val); } int wfx_config_reg_write(struct wfx_dev *wdev, u32 val) { return wfx_write32_locked(wdev, WFX_REG_CONFIG, val); } int wfx_config_reg_write_bits(struct wfx_dev *wdev, u32 mask, u32 val) { return wfx_write32_bits_locked(wdev, WFX_REG_CONFIG, mask, val); } int wfx_control_reg_read(struct wfx_dev *wdev, u32 *val) { return wfx_read32_locked(wdev, WFX_REG_CONTROL, val); } int wfx_control_reg_write(struct wfx_dev *wdev, u32 val) { return wfx_write32_locked(wdev, WFX_REG_CONTROL, val); } int wfx_control_reg_write_bits(struct wfx_dev *wdev, u32 mask, u32 val) { return wfx_write32_bits_locked(wdev, WFX_REG_CONTROL, mask, val); } int wfx_igpr_reg_read(struct wfx_dev *wdev, int index, u32 *val) { int ret; *val = ~0; /* Never return undefined value */ ret = wfx_write32_locked(wdev, WFX_REG_SET_GEN_R_W, IGPR_RW | index << 24); if (ret) return ret; ret = wfx_read32_locked(wdev, WFX_REG_SET_GEN_R_W, val); if (ret) return ret; *val &= IGPR_VALUE; return ret; } int wfx_igpr_reg_write(struct wfx_dev *wdev, int index, u32 val) { return wfx_write32_locked(wdev, WFX_REG_SET_GEN_R_W, index << 24 | val); } |