1 /* 2 * Allwinner SoCs SRAM Controller Driver 3 * 4 * Copyright (C) 2015 Maxime Ripard 5 * 6 * Author: Maxime Ripard <maxime.ripard@free-electrons.com> 7 * 8 * This file is licensed under the terms of the GNU General Public 9 * License version 2. This program is licensed "as is" without any 10 * warranty of any kind, whether express or implied. 11 */ 12 13 #include <linux/debugfs.h> 14 #include <linux/io.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/of_address.h> 18 #include <linux/of_device.h> 19 #include <linux/platform_device.h> 20 #include <linux/regmap.h> 21 22 #include <linux/soc/sunxi/sunxi_sram.h> 23 24 struct sunxi_sram_func { 25 char *func; 26 u8 val; 27 u32 reg_val; 28 }; 29 30 struct sunxi_sram_data { 31 char *name; 32 u8 reg; 33 u8 offset; 34 u8 width; 35 struct sunxi_sram_func *func; 36 struct list_head list; 37 }; 38 39 struct sunxi_sram_desc { 40 struct sunxi_sram_data data; 41 bool claimed; 42 }; 43 44 #define SUNXI_SRAM_MAP(_reg_val, _val, _func) \ 45 { \ 46 .func = _func, \ 47 .val = _val, \ 48 .reg_val = _reg_val, \ 49 } 50 51 #define SUNXI_SRAM_DATA(_name, _reg, _off, _width, ...) \ 52 { \ 53 .name = _name, \ 54 .reg = _reg, \ 55 .offset = _off, \ 56 .width = _width, \ 57 .func = (struct sunxi_sram_func[]){ \ 58 __VA_ARGS__, { } }, \ 59 } 60 61 static struct sunxi_sram_desc sun4i_a10_sram_a3_a4 = { 62 .data = SUNXI_SRAM_DATA("A3-A4", 0x4, 0x4, 2, 63 SUNXI_SRAM_MAP(0, 0, "cpu"), 64 SUNXI_SRAM_MAP(1, 1, "emac")), 65 }; 66 67 static struct sunxi_sram_desc sun4i_a10_sram_c1 = { 68 .data = SUNXI_SRAM_DATA("C1", 0x0, 0x0, 31, 69 SUNXI_SRAM_MAP(0, 0, "cpu"), 70 SUNXI_SRAM_MAP(0x7fffffff, 1, "ve")), 71 }; 72 73 static struct sunxi_sram_desc sun4i_a10_sram_d = { 74 .data = SUNXI_SRAM_DATA("D", 0x4, 0x0, 1, 75 SUNXI_SRAM_MAP(0, 0, "cpu"), 76 SUNXI_SRAM_MAP(1, 1, "usb-otg")), 77 }; 78 79 static struct sunxi_sram_desc sun50i_a64_sram_c = { 80 .data = SUNXI_SRAM_DATA("C", 0x4, 24, 1, 81 SUNXI_SRAM_MAP(0, 1, "cpu"), 82 SUNXI_SRAM_MAP(1, 0, "de2")), 83 }; 84 85 static const struct of_device_id sunxi_sram_dt_ids[] = { 86 { 87 .compatible = "allwinner,sun4i-a10-sram-a3-a4", 88 .data = &sun4i_a10_sram_a3_a4.data, 89 }, 90 { 91 .compatible = "allwinner,sun4i-a10-sram-c1", 92 .data = &sun4i_a10_sram_c1.data, 93 }, 94 { 95 .compatible = "allwinner,sun4i-a10-sram-d", 96 .data = &sun4i_a10_sram_d.data, 97 }, 98 { 99 .compatible = "allwinner,sun50i-a64-sram-c", 100 .data = &sun50i_a64_sram_c.data, 101 }, 102 {} 103 }; 104 105 static struct device *sram_dev; 106 static LIST_HEAD(claimed_sram); 107 static DEFINE_SPINLOCK(sram_lock); 108 static void __iomem *base; 109 110 static int sunxi_sram_show(struct seq_file *s, void *data) 111 { 112 struct device_node *sram_node, *section_node; 113 const struct sunxi_sram_data *sram_data; 114 const struct of_device_id *match; 115 struct sunxi_sram_func *func; 116 const __be32 *sram_addr_p, *section_addr_p; 117 u32 val; 118 119 seq_puts(s, "Allwinner sunXi SRAM\n"); 120 seq_puts(s, "--------------------\n\n"); 121 122 for_each_child_of_node(sram_dev->of_node, sram_node) { 123 sram_addr_p = of_get_address(sram_node, 0, NULL, NULL); 124 125 seq_printf(s, "sram@%08x\n", 126 be32_to_cpu(*sram_addr_p)); 127 128 for_each_child_of_node(sram_node, section_node) { 129 match = of_match_node(sunxi_sram_dt_ids, section_node); 130 if (!match) 131 continue; 132 sram_data = match->data; 133 134 section_addr_p = of_get_address(section_node, 0, 135 NULL, NULL); 136 137 seq_printf(s, "\tsection@%04x\t(%s)\n", 138 be32_to_cpu(*section_addr_p), 139 sram_data->name); 140 141 val = readl(base + sram_data->reg); 142 val >>= sram_data->offset; 143 val &= GENMASK(sram_data->width - 1, 0); 144 145 for (func = sram_data->func; func->func; func++) { 146 seq_printf(s, "\t\t%s%c\n", func->func, 147 func->reg_val == val ? 148 '*' : ' '); 149 } 150 } 151 152 seq_puts(s, "\n"); 153 } 154 155 return 0; 156 } 157 158 DEFINE_SHOW_ATTRIBUTE(sunxi_sram); 159 160 static inline struct sunxi_sram_desc *to_sram_desc(const struct sunxi_sram_data *data) 161 { 162 return container_of(data, struct sunxi_sram_desc, data); 163 } 164 165 static const struct sunxi_sram_data *sunxi_sram_of_parse(struct device_node *node, 166 unsigned int *reg_value) 167 { 168 const struct of_device_id *match; 169 const struct sunxi_sram_data *data; 170 struct sunxi_sram_func *func; 171 struct of_phandle_args args; 172 u8 val; 173 int ret; 174 175 ret = of_parse_phandle_with_fixed_args(node, "allwinner,sram", 1, 0, 176 &args); 177 if (ret) 178 return ERR_PTR(ret); 179 180 if (!of_device_is_available(args.np)) { 181 ret = -EBUSY; 182 goto err; 183 } 184 185 val = args.args[0]; 186 187 match = of_match_node(sunxi_sram_dt_ids, args.np); 188 if (!match) { 189 ret = -EINVAL; 190 goto err; 191 } 192 193 data = match->data; 194 if (!data) { 195 ret = -EINVAL; 196 goto err; 197 }; 198 199 for (func = data->func; func->func; func++) { 200 if (val == func->val) { 201 if (reg_value) 202 *reg_value = func->reg_val; 203 204 break; 205 } 206 } 207 208 if (!func->func) { 209 ret = -EINVAL; 210 goto err; 211 } 212 213 of_node_put(args.np); 214 return match->data; 215 216 err: 217 of_node_put(args.np); 218 return ERR_PTR(ret); 219 } 220 221 int sunxi_sram_claim(struct device *dev) 222 { 223 const struct sunxi_sram_data *sram_data; 224 struct sunxi_sram_desc *sram_desc; 225 unsigned int device; 226 u32 val, mask; 227 228 if (IS_ERR(base)) 229 return PTR_ERR(base); 230 231 if (!base) 232 return -EPROBE_DEFER; 233 234 if (!dev || !dev->of_node) 235 return -EINVAL; 236 237 sram_data = sunxi_sram_of_parse(dev->of_node, &device); 238 if (IS_ERR(sram_data)) 239 return PTR_ERR(sram_data); 240 241 sram_desc = to_sram_desc(sram_data); 242 243 spin_lock(&sram_lock); 244 245 if (sram_desc->claimed) { 246 spin_unlock(&sram_lock); 247 return -EBUSY; 248 } 249 250 mask = GENMASK(sram_data->offset + sram_data->width - 1, 251 sram_data->offset); 252 val = readl(base + sram_data->reg); 253 val &= ~mask; 254 writel(val | ((device << sram_data->offset) & mask), 255 base + sram_data->reg); 256 257 spin_unlock(&sram_lock); 258 259 return 0; 260 } 261 EXPORT_SYMBOL(sunxi_sram_claim); 262 263 int sunxi_sram_release(struct device *dev) 264 { 265 const struct sunxi_sram_data *sram_data; 266 struct sunxi_sram_desc *sram_desc; 267 268 if (!dev || !dev->of_node) 269 return -EINVAL; 270 271 sram_data = sunxi_sram_of_parse(dev->of_node, NULL); 272 if (IS_ERR(sram_data)) 273 return -EINVAL; 274 275 sram_desc = to_sram_desc(sram_data); 276 277 spin_lock(&sram_lock); 278 sram_desc->claimed = false; 279 spin_unlock(&sram_lock); 280 281 return 0; 282 } 283 EXPORT_SYMBOL(sunxi_sram_release); 284 285 struct sunxi_sramc_variant { 286 bool has_emac_clock; 287 }; 288 289 static const struct sunxi_sramc_variant sun4i_a10_sramc_variant = { 290 /* Nothing special */ 291 }; 292 293 static const struct sunxi_sramc_variant sun8i_h3_sramc_variant = { 294 .has_emac_clock = true, 295 }; 296 297 static const struct sunxi_sramc_variant sun50i_a64_sramc_variant = { 298 .has_emac_clock = true, 299 }; 300 301 #define SUNXI_SRAM_EMAC_CLOCK_REG 0x30 302 static bool sunxi_sram_regmap_accessible_reg(struct device *dev, 303 unsigned int reg) 304 { 305 if (reg == SUNXI_SRAM_EMAC_CLOCK_REG) 306 return true; 307 return false; 308 } 309 310 static struct regmap_config sunxi_sram_emac_clock_regmap = { 311 .reg_bits = 32, 312 .val_bits = 32, 313 .reg_stride = 4, 314 /* last defined register */ 315 .max_register = SUNXI_SRAM_EMAC_CLOCK_REG, 316 /* other devices have no business accessing other registers */ 317 .readable_reg = sunxi_sram_regmap_accessible_reg, 318 .writeable_reg = sunxi_sram_regmap_accessible_reg, 319 }; 320 321 static int sunxi_sram_probe(struct platform_device *pdev) 322 { 323 struct resource *res; 324 struct dentry *d; 325 struct regmap *emac_clock; 326 const struct sunxi_sramc_variant *variant; 327 328 sram_dev = &pdev->dev; 329 330 variant = of_device_get_match_data(&pdev->dev); 331 if (!variant) 332 return -EINVAL; 333 334 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 335 base = devm_ioremap_resource(&pdev->dev, res); 336 if (IS_ERR(base)) 337 return PTR_ERR(base); 338 339 of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev); 340 341 d = debugfs_create_file("sram", S_IRUGO, NULL, NULL, 342 &sunxi_sram_fops); 343 if (!d) 344 return -ENOMEM; 345 346 if (variant->has_emac_clock) { 347 emac_clock = devm_regmap_init_mmio(&pdev->dev, base, 348 &sunxi_sram_emac_clock_regmap); 349 350 if (IS_ERR(emac_clock)) 351 return PTR_ERR(emac_clock); 352 } 353 354 return 0; 355 } 356 357 static const struct of_device_id sunxi_sram_dt_match[] = { 358 { 359 .compatible = "allwinner,sun4i-a10-sram-controller", 360 .data = &sun4i_a10_sramc_variant, 361 }, 362 { 363 .compatible = "allwinner,sun4i-a10-system-control", 364 .data = &sun4i_a10_sramc_variant, 365 }, 366 { 367 .compatible = "allwinner,sun5i-a13-system-control", 368 .data = &sun4i_a10_sramc_variant, 369 }, 370 { 371 .compatible = "allwinner,sun8i-a23-system-control", 372 .data = &sun4i_a10_sramc_variant, 373 }, 374 { 375 .compatible = "allwinner,sun8i-h3-system-control", 376 .data = &sun8i_h3_sramc_variant, 377 }, 378 { 379 .compatible = "allwinner,sun50i-a64-sram-controller", 380 .data = &sun50i_a64_sramc_variant, 381 }, 382 { 383 .compatible = "allwinner,sun50i-a64-system-control", 384 .data = &sun50i_a64_sramc_variant, 385 }, 386 { 387 .compatible = "allwinner,sun50i-h5-system-control", 388 .data = &sun50i_a64_sramc_variant, 389 }, 390 { }, 391 }; 392 MODULE_DEVICE_TABLE(of, sunxi_sram_dt_match); 393 394 static struct platform_driver sunxi_sram_driver = { 395 .driver = { 396 .name = "sunxi-sram", 397 .of_match_table = sunxi_sram_dt_match, 398 }, 399 .probe = sunxi_sram_probe, 400 }; 401 module_platform_driver(sunxi_sram_driver); 402 403 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 404 MODULE_DESCRIPTION("Allwinner sunXi SRAM Controller Driver"); 405 MODULE_LICENSE("GPL"); 406