drivers/soc/qcom/ocmem.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * The On Chip Memory (OCMEM) allocator allows various clients to allocate
   4  * memory from OCMEM based on performance, latency and power requirements.
   5  * This is typically used by the GPU, camera/video, and audio components on
   6  * some Snapdragon SoCs.
   7  *
   8  * Copyright (C) 2019 Brian Masney <masneyb@onstation.org>
   9  * Copyright (C) 2015 Red Hat. Author: Rob Clark <robdclark@gmail.com>
  10  */
  11
  12 #include <linux/bitfield.h>
  13 #include <linux/clk.h>
  14 #include <linux/io.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/of_device.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/qcom_scm.h>
  20 #include <linux/sizes.h>
  21 #include <linux/slab.h>
  22 #include <linux/types.h>
  23 #include <soc/qcom/ocmem.h>
  24
  25 enum region_mode {
  26         WIDE_MODE = 0x0,
  27         THIN_MODE,
  28         MODE_DEFAULT = WIDE_MODE,
  29 };
  30
  31 enum ocmem_macro_state {
  32         PASSTHROUGH = 0,
  33         PERI_ON = 1,
  34         CORE_ON = 2,
  35         CLK_OFF = 4,
  36 };
  37
  38 struct ocmem_region {
  39         bool interleaved;
  40         enum region_mode mode;
  41         unsigned int num_macros;
  42         enum ocmem_macro_state macro_state[4];
  43         unsigned long macro_size;
  44         unsigned long region_size;
  45 };
  46
  47 struct ocmem_config {
  48         uint8_t num_regions;
  49         unsigned long macro_size;
  50 };
  51
  52 struct ocmem {
  53         struct device *dev;
  54         const struct ocmem_config *config;
  55         struct resource *memory;
  56         void __iomem *mmio;
  57         unsigned int num_ports;
  58         unsigned int num_macros;
  59         bool interleaved;
  60         struct ocmem_region *regions;
  61         unsigned long active_allocations;
  62 };
  63
  64 #define OCMEM_MIN_ALIGN                         SZ_64K
  65 #define OCMEM_MIN_ALLOC                         SZ_64K
  66
  67 #define OCMEM_REG_HW_VERSION                    0x00000000
  68 #define OCMEM_REG_HW_PROFILE                    0x00000004
  69
  70 #define OCMEM_REG_REGION_MODE_CTL               0x00001000
  71 #define OCMEM_REGION_MODE_CTL_REG0_THIN         0x00000001
  72 #define OCMEM_REGION_MODE_CTL_REG1_THIN         0x00000002
  73 #define OCMEM_REGION_MODE_CTL_REG2_THIN         0x00000004
  74 #define OCMEM_REGION_MODE_CTL_REG3_THIN         0x00000008
  75
  76 #define OCMEM_REG_GFX_MPU_START                 0x00001004
  77 #define OCMEM_REG_GFX_MPU_END                   0x00001008
  78
  79 #define OCMEM_HW_PROFILE_NUM_PORTS(val)         FIELD_PREP(0x0000000f, (val))
  80 #define OCMEM_HW_PROFILE_NUM_MACROS(val)        FIELD_PREP(0x00003f00, (val))
  81
  82 #define OCMEM_HW_PROFILE_LAST_REGN_HALFSIZE     0x00010000
  83 #define OCMEM_HW_PROFILE_INTERLEAVING           0x00020000
  84 #define OCMEM_REG_GEN_STATUS                    0x0000000c
  85
  86 #define OCMEM_REG_PSGSC_STATUS                  0x00000038
  87 #define OCMEM_REG_PSGSC_CTL(i0)                 (0x0000003c + 0x1*(i0))
  88
  89 #define OCMEM_PSGSC_CTL_MACRO0_MODE(val)        FIELD_PREP(0x00000007, (val))
  90 #define OCMEM_PSGSC_CTL_MACRO1_MODE(val)        FIELD_PREP(0x00000070, (val))
  91 #define OCMEM_PSGSC_CTL_MACRO2_MODE(val)        FIELD_PREP(0x00000700, (val))
  92 #define OCMEM_PSGSC_CTL_MACRO3_MODE(val)        FIELD_PREP(0x00007000, (val))
  93
  94 #define OCMEM_CLK_CORE_IDX                      0
  95 static struct clk_bulk_data ocmem_clks[] = {
  96         {
  97                 .id = "core",
  98         },
  99         {
 100                 .id = "iface",
 101         },
 102 };
 103
 104 static inline void ocmem_write(struct ocmem *ocmem, u32 reg, u32 data)
 105 {
 106         writel(data, ocmem->mmio + reg);
 107 }
 108
 109 static inline u32 ocmem_read(struct ocmem *ocmem, u32 reg)
 110 {
 111         return readl(ocmem->mmio + reg);
 112 }
 113
 114 static void update_ocmem(struct ocmem *ocmem)
 115 {
 116         uint32_t region_mode_ctrl = 0x0;
 117         int i;
 118
 119         if (!qcom_scm_ocmem_lock_available()) {
 120                 for (i = 0; i < ocmem->config->num_regions; i++) {
 121                         struct ocmem_region *region = &ocmem->regions[i];
 122
 123                         if (region->mode == THIN_MODE)
 124                                 region_mode_ctrl |= BIT(i);
 125                 }
 126
 127                 dev_dbg(ocmem->dev, "ocmem_region_mode_control %x\n",
 128                         region_mode_ctrl);
 129                 ocmem_write(ocmem, OCMEM_REG_REGION_MODE_CTL, region_mode_ctrl);
 130         }
 131
 132         for (i = 0; i < ocmem->config->num_regions; i++) {
 133                 struct ocmem_region *region = &ocmem->regions[i];
 134                 u32 data;
 135
 136                 data = OCMEM_PSGSC_CTL_MACRO0_MODE(region->macro_state[0]) |
 137                         OCMEM_PSGSC_CTL_MACRO1_MODE(region->macro_state[1]) |
 138                         OCMEM_PSGSC_CTL_MACRO2_MODE(region->macro_state[2]) |
 139                         OCMEM_PSGSC_CTL_MACRO3_MODE(region->macro_state[3]);
 140
 141                 ocmem_write(ocmem, OCMEM_REG_PSGSC_CTL(i), data);
 142         }
 143 }
 144
 145 static unsigned long phys_to_offset(struct ocmem *ocmem,
 146                                     unsigned long addr)
 147 {
 148         if (addr < ocmem->memory->start || addr >= ocmem->memory->end)
 149                 return 0;
 150
 151         return addr - ocmem->memory->start;
 152 }
 153
 154 static unsigned long device_address(struct ocmem *ocmem,
 155                                     enum ocmem_client client,
 156                                     unsigned long addr)
 157 {
 158         WARN_ON(client != OCMEM_GRAPHICS);
 159
 160         /* TODO: gpu uses phys_to_offset, but others do not.. */
 161         return phys_to_offset(ocmem, addr);
 162 }
 163
 164 static void update_range(struct ocmem *ocmem, struct ocmem_buf *buf,
 165                          enum ocmem_macro_state mstate, enum region_mode rmode)
 166 {
 167         unsigned long offset = 0;
 168         int i, j;
 169
 170         for (i = 0; i < ocmem->config->num_regions; i++) {
 171                 struct ocmem_region *region = &ocmem->regions[i];
 172
 173                 if (buf->offset <= offset && offset < buf->offset + buf->len)
 174                         region->mode = rmode;
 175
 176                 for (j = 0; j < region->num_macros; j++) {
 177                         if (buf->offset <= offset &&
 178                             offset < buf->offset + buf->len)
 179                                 region->macro_state[j] = mstate;
 180
 181                         offset += region->macro_size;
 182                 }
 183         }
 184
 185         update_ocmem(ocmem);
 186 }
 187
 188 struct ocmem *of_get_ocmem(struct device *dev)
 189 {
 190         struct platform_device *pdev;
 191         struct device_node *devnode;
 192         struct ocmem *ocmem;
 193
 194         devnode = of_parse_phandle(dev->of_node, "sram", 0);
 195         if (!devnode || !devnode->parent) {
 196                 dev_err(dev, "Cannot look up sram phandle\n");
 197                 return ERR_PTR(-ENODEV);
 198         }
 199
 200         pdev = of_find_device_by_node(devnode->parent);
 201         if (!pdev) {
 202                 dev_err(dev, "Cannot find device node %s\n", devnode->name);
 203                 return ERR_PTR(-EPROBE_DEFER);
 204         }
 205
 206         ocmem = platform_get_drvdata(pdev);
 207         if (!ocmem) {
 208                 dev_err(dev, "Cannot get ocmem\n");
 209                 return ERR_PTR(-ENODEV);
 210         }
 211         return ocmem;
 212 }
 213 EXPORT_SYMBOL(of_get_ocmem);
 214
 215 struct ocmem_buf *ocmem_allocate(struct ocmem *ocmem, enum ocmem_client client,
 216                                  unsigned long size)
 217 {
 218         struct ocmem_buf *buf;
 219         int ret;
 220
 221         /* TODO: add support for other clients... */
 222         if (WARN_ON(client != OCMEM_GRAPHICS))
 223                 return ERR_PTR(-ENODEV);
 224
 225         if (size < OCMEM_MIN_ALLOC || !IS_ALIGNED(size, OCMEM_MIN_ALIGN))
 226                 return ERR_PTR(-EINVAL);
 227
 228         if (test_and_set_bit_lock(BIT(client), &ocmem->active_allocations))
 229                 return ERR_PTR(-EBUSY);
 230
 231         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 232         if (!buf) {
 233                 ret = -ENOMEM;
 234                 goto err_unlock;
 235         }
 236
 237         buf->offset = 0;
 238         buf->addr = device_address(ocmem, client, buf->offset);
 239         buf->len = size;
 240
 241         update_range(ocmem, buf, CORE_ON, WIDE_MODE);
 242
 243         if (qcom_scm_ocmem_lock_available()) {
 244                 ret = qcom_scm_ocmem_lock(QCOM_SCM_OCMEM_GRAPHICS_ID,
 245                                           buf->offset, buf->len, WIDE_MODE);
 246                 if (ret) {
 247                         dev_err(ocmem->dev, "could not lock: %d\n", ret);
 248                         ret = -EINVAL;
 249                         goto err_kfree;
 250                 }
 251         } else {
 252                 ocmem_write(ocmem, OCMEM_REG_GFX_MPU_START, buf->offset);
 253                 ocmem_write(ocmem, OCMEM_REG_GFX_MPU_END,
 254                             buf->offset + buf->len);
 255         }
 256
 257         dev_dbg(ocmem->dev, "using %ldK of OCMEM at 0x%08lx for client %d\n",
 258                 size / 1024, buf->addr, client);
 259
 260         return buf;
 261
 262 err_kfree:
 263         kfree(buf);
 264 err_unlock:
 265         clear_bit_unlock(BIT(client), &ocmem->active_allocations);
 266
 267         return ERR_PTR(ret);
 268 }
 269 EXPORT_SYMBOL(ocmem_allocate);
 270
 271 void ocmem_free(struct ocmem *ocmem, enum ocmem_client client,
 272                 struct ocmem_buf *buf)
 273 {
 274         /* TODO: add support for other clients... */
 275         if (WARN_ON(client != OCMEM_GRAPHICS))
 276                 return;
 277
 278         update_range(ocmem, buf, CLK_OFF, MODE_DEFAULT);
 279
 280         if (qcom_scm_ocmem_lock_available()) {
 281                 int ret;
 282
 283                 ret = qcom_scm_ocmem_unlock(QCOM_SCM_OCMEM_GRAPHICS_ID,
 284                                             buf->offset, buf->len);
 285                 if (ret)
 286                         dev_err(ocmem->dev, "could not unlock: %d\n", ret);
 287         } else {
 288                 ocmem_write(ocmem, OCMEM_REG_GFX_MPU_START, 0x0);
 289                 ocmem_write(ocmem, OCMEM_REG_GFX_MPU_END, 0x0);
 290         }
 291
 292         kfree(buf);
 293
 294         clear_bit_unlock(BIT(client), &ocmem->active_allocations);
 295 }
 296 EXPORT_SYMBOL(ocmem_free);
 297
 298 static int ocmem_dev_probe(struct platform_device *pdev)
 299 {
 300         struct device *dev = &pdev->dev;
 301         unsigned long reg, region_size;
 302         int i, j, ret, num_banks;
 303         struct resource *res;
 304         struct ocmem *ocmem;
 305
 306         if (!qcom_scm_is_available())
 307                 return -EPROBE_DEFER;
 308
 309         ocmem = devm_kzalloc(dev, sizeof(*ocmem), GFP_KERNEL);
 310         if (!ocmem)
 311                 return -ENOMEM;
 312
 313         ocmem->dev = dev;
 314         ocmem->config = device_get_match_data(dev);
 315
 316         ret = devm_clk_bulk_get(dev, ARRAY_SIZE(ocmem_clks), ocmem_clks);
 317         if (ret) {
 318                 if (ret != -EPROBE_DEFER)
 319                         dev_err(dev, "Unable to get clocks\n");
 320
 321                 return ret;
 322         }
 323
 324         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
 325         ocmem->mmio = devm_ioremap_resource(&pdev->dev, res);
 326         if (IS_ERR(ocmem->mmio)) {
 327                 dev_err(&pdev->dev, "Failed to ioremap ocmem_ctrl resource\n");
 328                 return PTR_ERR(ocmem->mmio);
 329         }
 330
 331         ocmem->memory = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 332                                                      "mem");
 333         if (!ocmem->memory) {
 334                 dev_err(dev, "Could not get mem region\n");
 335                 return -ENXIO;
 336         }
 337
 338         /* The core clock is synchronous with graphics */
 339         WARN_ON(clk_set_rate(ocmem_clks[OCMEM_CLK_CORE_IDX].clk, 1000) < 0);
 340
 341         ret = clk_bulk_prepare_enable(ARRAY_SIZE(ocmem_clks), ocmem_clks);
 342         if (ret) {
 343                 dev_info(ocmem->dev, "Failed to enable clocks\n");
 344                 return ret;
 345         }
 346
 347         if (qcom_scm_restore_sec_cfg_available()) {
 348                 dev_dbg(dev, "configuring scm\n");
 349                 ret = qcom_scm_restore_sec_cfg(QCOM_SCM_OCMEM_DEV_ID, 0);
 350                 if (ret) {
 351                         dev_err(dev, "Could not enable secure configuration\n");
 352                         goto err_clk_disable;
 353                 }
 354         }
 355
 356         reg = ocmem_read(ocmem, OCMEM_REG_HW_PROFILE);
 357         ocmem->num_ports = OCMEM_HW_PROFILE_NUM_PORTS(reg);
 358         ocmem->num_macros = OCMEM_HW_PROFILE_NUM_MACROS(reg);
 359         ocmem->interleaved = !!(reg & OCMEM_HW_PROFILE_INTERLEAVING);
 360
 361         num_banks = ocmem->num_ports / 2;
 362         region_size = ocmem->config->macro_size * num_banks;
 363
 364         dev_info(dev, "%u ports, %u regions, %u macros, %sinterleaved\n",
 365                  ocmem->num_ports, ocmem->config->num_regions,
 366                  ocmem->num_macros, ocmem->interleaved ? "" : "not ");
 367
 368         ocmem->regions = devm_kcalloc(dev, ocmem->config->num_regions,
 369                                       sizeof(struct ocmem_region), GFP_KERNEL);
 370         if (!ocmem->regions) {
 371                 ret = -ENOMEM;
 372                 goto err_clk_disable;
 373         }
 374
 375         for (i = 0; i < ocmem->config->num_regions; i++) {
 376                 struct ocmem_region *region = &ocmem->regions[i];
 377
 378                 if (WARN_ON(num_banks > ARRAY_SIZE(region->macro_state))) {
 379                         ret = -EINVAL;
 380                         goto err_clk_disable;
 381                 }
 382
 383                 region->mode = MODE_DEFAULT;
 384                 region->num_macros = num_banks;
 385
 386                 if (i == (ocmem->config->num_regions - 1) &&
 387                     reg & OCMEM_HW_PROFILE_LAST_REGN_HALFSIZE) {
 388                         region->macro_size = ocmem->config->macro_size / 2;
 389                         region->region_size = region_size / 2;
 390                 } else {
 391                         region->macro_size = ocmem->config->macro_size;
 392                         region->region_size = region_size;
 393                 }
 394
 395                 for (j = 0; j < ARRAY_SIZE(region->macro_state); j++)
 396                         region->macro_state[j] = CLK_OFF;
 397         }
 398
 399         platform_set_drvdata(pdev, ocmem);
 400
 401         return 0;
 402
 403 err_clk_disable:
 404         clk_bulk_disable_unprepare(ARRAY_SIZE(ocmem_clks), ocmem_clks);
 405         return ret;
 406 }
 407
 408 static int ocmem_dev_remove(struct platform_device *pdev)
 409 {
 410         clk_bulk_disable_unprepare(ARRAY_SIZE(ocmem_clks), ocmem_clks);
 411
 412         return 0;
 413 }
 414
 415 static const struct ocmem_config ocmem_8974_config = {
 416         .num_regions = 3,
 417         .macro_size = SZ_128K,
 418 };
 419
 420 static const struct of_device_id ocmem_of_match[] = {
 421         { .compatible = "qcom,msm8974-ocmem", .data = &ocmem_8974_config },
 422         { }
 423 };
 424
 425 MODULE_DEVICE_TABLE(of, ocmem_of_match);
 426
 427 static struct platform_driver ocmem_driver = {
 428         .probe = ocmem_dev_probe,
 429         .remove = ocmem_dev_remove,
 430         .driver = {
 431                 .name = "ocmem",
 432                 .of_match_table = ocmem_of_match,
 433         },
 434 };
 435
 436 module_platform_driver(ocmem_driver);
 437
 438 MODULE_DESCRIPTION("On Chip Memory (OCMEM) allocator for some Snapdragon SoCs");
 439 MODULE_LICENSE("GPL v2");