drivers/media/platform/qcom/venus/firmware.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2017 Linaro Ltd.
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/firmware.h>
   8 #include <linux/kernel.h>
   9 #include <linux/iommu.h>
  10 #include <linux/io.h>
  11 #include <linux/of.h>
  12 #include <linux/of_address.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/of_device.h>
  15 #include <linux/qcom_scm.h>
  16 #include <linux/sizes.h>
  17 #include <linux/soc/qcom/mdt_loader.h>
  18
  19 #include "core.h"
  20 #include "firmware.h"
  21 #include "hfi_venus_io.h"
  22
  23 #define VENUS_PAS_ID                    9
  24 #define VENUS_FW_MEM_SIZE               (6 * SZ_1M)
  25 #define VENUS_FW_START_ADDR             0x0
  26
  27 static void venus_reset_cpu(struct venus_core *core)
  28 {
  29         u32 fw_size = core->fw.mapped_mem_size;
  30         void __iomem *base = core->base;
  31
  32         writel(0, base + WRAPPER_FW_START_ADDR);
  33         writel(fw_size, base + WRAPPER_FW_END_ADDR);
  34         writel(0, base + WRAPPER_CPA_START_ADDR);
  35         writel(fw_size, base + WRAPPER_CPA_END_ADDR);
  36         writel(fw_size, base + WRAPPER_NONPIX_START_ADDR);
  37         writel(fw_size, base + WRAPPER_NONPIX_END_ADDR);
  38         writel(0x0, base + WRAPPER_CPU_CGC_DIS);
  39         writel(0x0, base + WRAPPER_CPU_CLOCK_CONFIG);
  40
  41         /* Bring ARM9 out of reset */
  42         writel(0, base + WRAPPER_A9SS_SW_RESET);
  43 }
  44
  45 int venus_set_hw_state(struct venus_core *core, bool resume)
  46 {
  47         if (core->use_tz)
  48                 return qcom_scm_set_remote_state(resume, 0);
  49
  50         if (resume)
  51                 venus_reset_cpu(core);
  52         else
  53                 writel(1, core->base + WRAPPER_A9SS_SW_RESET);
  54
  55         return 0;
  56 }
  57
  58 static int venus_load_fw(struct venus_core *core, const char *fwname,
  59                          phys_addr_t *mem_phys, size_t *mem_size)
  60 {
  61         const struct firmware *mdt;
  62         struct device_node *node;
  63         struct device *dev;
  64         struct resource r;
  65         ssize_t fw_size;
  66         void *mem_va;
  67         int ret;
  68
  69         *mem_phys = 0;
  70         *mem_size = 0;
  71
  72         dev = core->dev;
  73         node = of_parse_phandle(dev->of_node, "memory-region", 0);
  74         if (!node) {
  75                 dev_err(dev, "no memory-region specified\n");
  76                 return -EINVAL;
  77         }
  78
  79         ret = of_address_to_resource(node, 0, &r);
  80         if (ret)
  81                 goto err_put_node;
  82
  83         ret = request_firmware(&mdt, fwname, dev);
  84         if (ret < 0)
  85                 goto err_put_node;
  86
  87         fw_size = qcom_mdt_get_size(mdt);
  88         if (fw_size < 0) {
  89                 ret = fw_size;
  90                 goto err_release_fw;
  91         }
  92
  93         *mem_phys = r.start;
  94         *mem_size = resource_size(&r);
  95
  96         if (*mem_size < fw_size || fw_size > VENUS_FW_MEM_SIZE) {
  97                 ret = -EINVAL;
  98                 goto err_release_fw;
  99         }
 100
 101         mem_va = memremap(r.start, *mem_size, MEMREMAP_WC);
 102         if (!mem_va) {
 103                 dev_err(dev, "unable to map memory region: %pa+%zx\n",
 104                         &r.start, *mem_size);
 105                 ret = -ENOMEM;
 106                 goto err_release_fw;
 107         }
 108
 109         if (core->use_tz)
 110                 ret = qcom_mdt_load(dev, mdt, fwname, VENUS_PAS_ID,
 111                                     mem_va, *mem_phys, *mem_size, NULL);
 112         else
 113                 ret = qcom_mdt_load_no_init(dev, mdt, fwname, VENUS_PAS_ID,
 114                                             mem_va, *mem_phys, *mem_size, NULL);
 115
 116         memunmap(mem_va);
 117 err_release_fw:
 118         release_firmware(mdt);
 119 err_put_node:
 120         of_node_put(node);
 121         return ret;
 122 }
 123
 124 static int venus_boot_no_tz(struct venus_core *core, phys_addr_t mem_phys,
 125                             size_t mem_size)
 126 {
 127         struct iommu_domain *iommu;
 128         struct device *dev;
 129         int ret;
 130
 131         dev = core->fw.dev;
 132         if (!dev)
 133                 return -EPROBE_DEFER;
 134
 135         iommu = core->fw.iommu_domain;
 136         core->fw.mapped_mem_size = mem_size;
 137
 138         ret = iommu_map(iommu, VENUS_FW_START_ADDR, mem_phys, mem_size,
 139                         IOMMU_READ | IOMMU_WRITE | IOMMU_PRIV);
 140         if (ret) {
 141                 dev_err(dev, "could not map video firmware region\n");
 142                 return ret;
 143         }
 144
 145         venus_reset_cpu(core);
 146
 147         return 0;
 148 }
 149
 150 static int venus_shutdown_no_tz(struct venus_core *core)
 151 {
 152         const size_t mapped = core->fw.mapped_mem_size;
 153         struct iommu_domain *iommu;
 154         size_t unmapped;
 155         u32 reg;
 156         struct device *dev = core->fw.dev;
 157         void __iomem *base = core->base;
 158
 159         /* Assert the reset to ARM9 */
 160         reg = readl_relaxed(base + WRAPPER_A9SS_SW_RESET);
 161         reg |= WRAPPER_A9SS_SW_RESET_BIT;
 162         writel_relaxed(reg, base + WRAPPER_A9SS_SW_RESET);
 163
 164         /* Make sure reset is asserted before the mapping is removed */
 165         mb();
 166
 167         iommu = core->fw.iommu_domain;
 168
 169         unmapped = iommu_unmap(iommu, VENUS_FW_START_ADDR, mapped);
 170         if (unmapped != mapped)
 171                 dev_err(dev, "failed to unmap firmware\n");
 172
 173         return 0;
 174 }
 175
 176 int venus_boot(struct venus_core *core)
 177 {
 178         struct device *dev = core->dev;
 179         phys_addr_t mem_phys;
 180         size_t mem_size;
 181         int ret;
 182
 183         if (!IS_ENABLED(CONFIG_QCOM_MDT_LOADER) ||
 184             (core->use_tz && !qcom_scm_is_available()))
 185                 return -EPROBE_DEFER;
 186
 187         ret = venus_load_fw(core, core->res->fwname, &mem_phys, &mem_size);
 188         if (ret) {
 189                 dev_err(dev, "fail to load video firmware\n");
 190                 return -EINVAL;
 191         }
 192
 193         if (core->use_tz)
 194                 ret = qcom_scm_pas_auth_and_reset(VENUS_PAS_ID);
 195         else
 196                 ret = venus_boot_no_tz(core, mem_phys, mem_size);
 197
 198         return ret;
 199 }
 200
 201 int venus_shutdown(struct venus_core *core)
 202 {
 203         int ret;
 204
 205         if (core->use_tz)
 206                 ret = qcom_scm_pas_shutdown(VENUS_PAS_ID);
 207         else
 208                 ret = venus_shutdown_no_tz(core);
 209
 210         return ret;
 211 }
 212
 213 int venus_firmware_init(struct venus_core *core)
 214 {
 215         struct platform_device_info info;
 216         struct iommu_domain *iommu_dom;
 217         struct platform_device *pdev;
 218         struct device_node *np;
 219         int ret;
 220
 221         np = of_get_child_by_name(core->dev->of_node, "video-firmware");
 222         if (!np) {
 223                 core->use_tz = true;
 224                 return 0;
 225         }
 226
 227         memset(&info, 0, sizeof(info));
 228         info.fwnode = &np->fwnode;
 229         info.parent = core->dev;
 230         info.name = np->name;
 231         info.dma_mask = DMA_BIT_MASK(32);
 232
 233         pdev = platform_device_register_full(&info);
 234         if (IS_ERR(pdev)) {
 235                 of_node_put(np);
 236                 return PTR_ERR(pdev);
 237         }
 238
 239         pdev->dev.of_node = np;
 240
 241         ret = of_dma_configure(&pdev->dev, np, true);
 242         if (ret) {
 243                 dev_err(core->dev, "dma configure fail\n");
 244                 goto err_unregister;
 245         }
 246
 247         core->fw.dev = &pdev->dev;
 248
 249         iommu_dom = iommu_domain_alloc(&platform_bus_type);
 250         if (!iommu_dom) {
 251                 dev_err(core->fw.dev, "Failed to allocate iommu domain\n");
 252                 ret = -ENOMEM;
 253                 goto err_unregister;
 254         }
 255
 256         ret = iommu_attach_device(iommu_dom, core->fw.dev);
 257         if (ret) {
 258                 dev_err(core->fw.dev, "could not attach device\n");
 259                 goto err_iommu_free;
 260         }
 261
 262         core->fw.iommu_domain = iommu_dom;
 263
 264         of_node_put(np);
 265
 266         return 0;
 267
 268 err_iommu_free:
 269         iommu_domain_free(iommu_dom);
 270 err_unregister:
 271         platform_device_unregister(pdev);
 272         of_node_put(np);
 273         return ret;
 274 }
 275
 276 void venus_firmware_deinit(struct venus_core *core)
 277 {
 278         struct iommu_domain *iommu;
 279
 280         if (!core->fw.dev)
 281                 return;
 282
 283         iommu = core->fw.iommu_domain;
 284
 285         iommu_detach_device(iommu, core->fw.dev);
 286         iommu_domain_free(iommu);
 287
 288         platform_device_unregister(to_platform_device(core->fw.dev));
 289 }