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1/*2 * Allwinner SoCs SRAM Controller Driver3 *4 * Copyright (C) 2015 Maxime Ripard5 *6 * Author: Maxime Ripard <maxime.ripard@free-electrons.com>7 *8 * This file is licensed under the terms of the GNU General Public9 * License version 2. This program is licensed "as is" without any10 * 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_platform.h>19#include <linux/platform_device.h>20#include <linux/regmap.h>21 22#include <linux/soc/sunxi/sunxi_sram.h>23 24struct sunxi_sram_func {25 char *func;26 u8 val;27 u32 reg_val;28};29 30struct sunxi_sram_data {31 char *name;32 u8 reg;33 u8 offset;34 u8 width;35 struct sunxi_sram_func *func;36};37 38struct sunxi_sram_desc {39 struct sunxi_sram_data data;40 bool claimed;41};42 43#define SUNXI_SRAM_MAP(_reg_val, _val, _func) \44 { \45 .func = _func, \46 .val = _val, \47 .reg_val = _reg_val, \48 }49 50#define SUNXI_SRAM_DATA(_name, _reg, _off, _width, ...) \51 { \52 .name = _name, \53 .reg = _reg, \54 .offset = _off, \55 .width = _width, \56 .func = (struct sunxi_sram_func[]){ \57 __VA_ARGS__, { } }, \58 }59 60static struct sunxi_sram_desc sun4i_a10_sram_a3_a4 = {61 .data = SUNXI_SRAM_DATA("A3-A4", 0x4, 0x4, 2,62 SUNXI_SRAM_MAP(0, 0, "cpu"),63 SUNXI_SRAM_MAP(1, 1, "emac")),64};65 66static struct sunxi_sram_desc sun4i_a10_sram_c1 = {67 .data = SUNXI_SRAM_DATA("C1", 0x0, 0x0, 31,68 SUNXI_SRAM_MAP(0, 0, "cpu"),69 SUNXI_SRAM_MAP(0x7fffffff, 1, "ve")),70};71 72static struct sunxi_sram_desc sun4i_a10_sram_d = {73 .data = SUNXI_SRAM_DATA("D", 0x4, 0x0, 1,74 SUNXI_SRAM_MAP(0, 0, "cpu"),75 SUNXI_SRAM_MAP(1, 1, "usb-otg")),76};77 78static struct sunxi_sram_desc sun50i_a64_sram_c = {79 .data = SUNXI_SRAM_DATA("C", 0x4, 24, 1,80 SUNXI_SRAM_MAP(1, 0, "cpu"),81 SUNXI_SRAM_MAP(0, 1, "de2")),82};83 84static const struct of_device_id sunxi_sram_dt_ids[] = {85 {86 .compatible = "allwinner,sun4i-a10-sram-a3-a4",87 .data = &sun4i_a10_sram_a3_a4.data,88 },89 {90 .compatible = "allwinner,sun4i-a10-sram-c1",91 .data = &sun4i_a10_sram_c1.data,92 },93 {94 .compatible = "allwinner,sun4i-a10-sram-d",95 .data = &sun4i_a10_sram_d.data,96 },97 {98 .compatible = "allwinner,sun50i-a64-sram-c",99 .data = &sun50i_a64_sram_c.data,100 },101 {}102};103 104static struct device *sram_dev;105static DEFINE_SPINLOCK(sram_lock);106static void __iomem *base;107 108static int sunxi_sram_show(struct seq_file *s, void *data)109{110 struct device_node *sram_node, *section_node;111 const struct sunxi_sram_data *sram_data;112 const struct of_device_id *match;113 struct sunxi_sram_func *func;114 const __be32 *sram_addr_p, *section_addr_p;115 u32 val;116 117 seq_puts(s, "Allwinner sunXi SRAM\n");118 seq_puts(s, "--------------------\n\n");119 120 for_each_child_of_node(sram_dev->of_node, sram_node) {121 if (!of_device_is_compatible(sram_node, "mmio-sram"))122 continue;123 124 sram_addr_p = of_get_address(sram_node, 0, NULL, NULL);125 126 seq_printf(s, "sram@%08x\n",127 be32_to_cpu(*sram_addr_p));128 129 for_each_child_of_node(sram_node, section_node) {130 match = of_match_node(sunxi_sram_dt_ids, section_node);131 if (!match)132 continue;133 sram_data = match->data;134 135 section_addr_p = of_get_address(section_node, 0,136 NULL, NULL);137 138 seq_printf(s, "\tsection@%04x\t(%s)\n",139 be32_to_cpu(*section_addr_p),140 sram_data->name);141 142 val = readl(base + sram_data->reg);143 val >>= sram_data->offset;144 val &= GENMASK(sram_data->width - 1, 0);145 146 for (func = sram_data->func; func->func; func++) {147 seq_printf(s, "\t\t%s%c\n", func->func,148 func->reg_val == val ?149 '*' : ' ');150 }151 }152 153 seq_puts(s, "\n");154 }155 156 return 0;157}158 159DEFINE_SHOW_ATTRIBUTE(sunxi_sram);160 161static inline struct sunxi_sram_desc *to_sram_desc(const struct sunxi_sram_data *data)162{163 return container_of(data, struct sunxi_sram_desc, data);164}165 166static const struct sunxi_sram_data *sunxi_sram_of_parse(struct device_node *node,167 unsigned int *reg_value)168{169 const struct of_device_id *match;170 const struct sunxi_sram_data *data;171 struct sunxi_sram_func *func;172 struct of_phandle_args args;173 u8 val;174 int ret;175 176 ret = of_parse_phandle_with_fixed_args(node, "allwinner,sram", 1, 0,177 &args);178 if (ret)179 return ERR_PTR(ret);180 181 if (!of_device_is_available(args.np)) {182 ret = -EBUSY;183 goto err;184 }185 186 val = args.args[0];187 188 match = of_match_node(sunxi_sram_dt_ids, args.np);189 if (!match) {190 ret = -EINVAL;191 goto err;192 }193 194 data = match->data;195 if (!data) {196 ret = -EINVAL;197 goto err;198 }199 200 for (func = data->func; func->func; func++) {201 if (val == func->val) {202 if (reg_value)203 *reg_value = func->reg_val;204 205 break;206 }207 }208 209 if (!func->func) {210 ret = -EINVAL;211 goto err;212 }213 214 of_node_put(args.np);215 return match->data;216 217err:218 of_node_put(args.np);219 return ERR_PTR(ret);220}221 222int sunxi_sram_claim(struct device *dev)223{224 const struct sunxi_sram_data *sram_data;225 struct sunxi_sram_desc *sram_desc;226 unsigned int device;227 u32 val, mask;228 229 if (IS_ERR(base))230 return PTR_ERR(base);231 232 if (!base)233 return -EPROBE_DEFER;234 235 if (!dev || !dev->of_node)236 return -EINVAL;237 238 sram_data = sunxi_sram_of_parse(dev->of_node, &device);239 if (IS_ERR(sram_data))240 return PTR_ERR(sram_data);241 242 sram_desc = to_sram_desc(sram_data);243 244 spin_lock(&sram_lock);245 246 if (sram_desc->claimed) {247 spin_unlock(&sram_lock);248 return -EBUSY;249 }250 251 mask = GENMASK(sram_data->offset + sram_data->width - 1,252 sram_data->offset);253 val = readl(base + sram_data->reg);254 val &= ~mask;255 writel(val | ((device << sram_data->offset) & mask),256 base + sram_data->reg);257 258 sram_desc->claimed = true;259 spin_unlock(&sram_lock);260 261 return 0;262}263EXPORT_SYMBOL(sunxi_sram_claim);264 265void sunxi_sram_release(struct device *dev)266{267 const struct sunxi_sram_data *sram_data;268 struct sunxi_sram_desc *sram_desc;269 270 if (!dev || !dev->of_node)271 return;272 273 sram_data = sunxi_sram_of_parse(dev->of_node, NULL);274 if (IS_ERR(sram_data))275 return;276 277 sram_desc = to_sram_desc(sram_data);278 279 spin_lock(&sram_lock);280 sram_desc->claimed = false;281 spin_unlock(&sram_lock);282}283EXPORT_SYMBOL(sunxi_sram_release);284 285struct sunxi_sramc_variant {286 int num_emac_clocks;287 bool has_ldo_ctrl;288 bool has_ths_offset;289};290 291static const struct sunxi_sramc_variant sun4i_a10_sramc_variant = {292 /* Nothing special */293};294 295static const struct sunxi_sramc_variant sun8i_h3_sramc_variant = {296 .num_emac_clocks = 1,297};298 299static const struct sunxi_sramc_variant sun20i_d1_sramc_variant = {300 .num_emac_clocks = 1,301 .has_ldo_ctrl = true,302};303 304static const struct sunxi_sramc_variant sun50i_a64_sramc_variant = {305 .num_emac_clocks = 1,306};307 308static const struct sunxi_sramc_variant sun50i_h616_sramc_variant = {309 .num_emac_clocks = 2,310 .has_ths_offset = true,311};312 313#define SUNXI_SRAM_THS_OFFSET_REG 0x0314#define SUNXI_SRAM_EMAC_CLOCK_REG 0x30315#define SUNXI_SYS_LDO_CTRL_REG 0x150316 317static bool sunxi_sram_regmap_accessible_reg(struct device *dev,318 unsigned int reg)319{320 const struct sunxi_sramc_variant *variant = dev_get_drvdata(dev);321 322 if (reg == SUNXI_SRAM_THS_OFFSET_REG && variant->has_ths_offset)323 return true;324 if (reg >= SUNXI_SRAM_EMAC_CLOCK_REG &&325 reg < SUNXI_SRAM_EMAC_CLOCK_REG + variant->num_emac_clocks * 4)326 return true;327 if (reg == SUNXI_SYS_LDO_CTRL_REG && variant->has_ldo_ctrl)328 return true;329 330 return false;331}332 333static void sunxi_sram_lock(void *_lock)334{335 spinlock_t *lock = _lock;336 337 spin_lock(lock);338}339 340static void sunxi_sram_unlock(void *_lock)341{342 spinlock_t *lock = _lock;343 344 spin_unlock(lock);345}346 347static const struct regmap_config sunxi_sram_regmap_config = {348 .reg_bits = 32,349 .val_bits = 32,350 .reg_stride = 4,351 /* last defined register */352 .max_register = SUNXI_SYS_LDO_CTRL_REG,353 /* other devices have no business accessing other registers */354 .readable_reg = sunxi_sram_regmap_accessible_reg,355 .writeable_reg = sunxi_sram_regmap_accessible_reg,356 .lock = sunxi_sram_lock,357 .unlock = sunxi_sram_unlock,358 .lock_arg = &sram_lock,359};360 361static int __init sunxi_sram_probe(struct platform_device *pdev)362{363 const struct sunxi_sramc_variant *variant;364 struct device *dev = &pdev->dev;365 struct regmap *regmap;366 367 sram_dev = &pdev->dev;368 369 variant = of_device_get_match_data(&pdev->dev);370 if (!variant)371 return -EINVAL;372 373 dev_set_drvdata(dev, (struct sunxi_sramc_variant *)variant);374 375 base = devm_platform_ioremap_resource(pdev, 0);376 if (IS_ERR(base))377 return PTR_ERR(base);378 379 if (variant->num_emac_clocks || variant->has_ldo_ctrl) {380 regmap = devm_regmap_init_mmio(dev, base, &sunxi_sram_regmap_config);381 if (IS_ERR(regmap))382 return PTR_ERR(regmap);383 }384 385 of_platform_populate(dev->of_node, NULL, NULL, dev);386 387 debugfs_create_file("sram", 0444, NULL, NULL, &sunxi_sram_fops);388 389 return 0;390}391 392static const struct of_device_id sunxi_sram_dt_match[] = {393 {394 .compatible = "allwinner,sun4i-a10-sram-controller",395 .data = &sun4i_a10_sramc_variant,396 },397 {398 .compatible = "allwinner,sun4i-a10-system-control",399 .data = &sun4i_a10_sramc_variant,400 },401 {402 .compatible = "allwinner,sun5i-a13-system-control",403 .data = &sun4i_a10_sramc_variant,404 },405 {406 .compatible = "allwinner,sun8i-a23-system-control",407 .data = &sun4i_a10_sramc_variant,408 },409 {410 .compatible = "allwinner,sun8i-h3-system-control",411 .data = &sun8i_h3_sramc_variant,412 },413 {414 .compatible = "allwinner,sun20i-d1-system-control",415 .data = &sun20i_d1_sramc_variant,416 },417 {418 .compatible = "allwinner,sun50i-a64-sram-controller",419 .data = &sun50i_a64_sramc_variant,420 },421 {422 .compatible = "allwinner,sun50i-a64-system-control",423 .data = &sun50i_a64_sramc_variant,424 },425 {426 .compatible = "allwinner,sun50i-h5-system-control",427 .data = &sun50i_a64_sramc_variant,428 },429 {430 .compatible = "allwinner,sun50i-h616-system-control",431 .data = &sun50i_h616_sramc_variant,432 },433 { },434};435MODULE_DEVICE_TABLE(of, sunxi_sram_dt_match);436 437static struct platform_driver sunxi_sram_driver = {438 .driver = {439 .name = "sunxi-sram",440 .of_match_table = sunxi_sram_dt_match,441 },442};443builtin_platform_driver_probe(sunxi_sram_driver, sunxi_sram_probe);444 445MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");446MODULE_DESCRIPTION("Allwinner sunXi SRAM Controller Driver");447