drivers/gpu/drm/tegra/falcon.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015, NVIDIA Corporation.
   4  */
   5
   6 #include <linux/platform_device.h>
   7 #include <linux/dma-mapping.h>
   8 #include <linux/firmware.h>
   9 #include <linux/pci_ids.h>
  10 #include <linux/iopoll.h>
  11
  12 #include "falcon.h"
  13 #include "drm.h"
  14
  15 enum falcon_memory {
  16         FALCON_MEMORY_IMEM,
  17         FALCON_MEMORY_DATA,
  18 };
  19
  20 static void falcon_writel(struct falcon *falcon, u32 value, u32 offset)
  21 {
  22         writel(value, falcon->regs + offset);
  23 }
  24
  25 int falcon_wait_idle(struct falcon *falcon)
  26 {
  27         u32 value;
  28
  29         return readl_poll_timeout(falcon->regs + FALCON_IDLESTATE, value,
  30                                   (value == 0), 10, 100000);
  31 }
  32
  33 static int falcon_dma_wait_idle(struct falcon *falcon)
  34 {
  35         u32 value;
  36
  37         return readl_poll_timeout(falcon->regs + FALCON_DMATRFCMD, value,
  38                                   (value & FALCON_DMATRFCMD_IDLE), 10, 100000);
  39 }
  40
  41 static int falcon_copy_chunk(struct falcon *falcon,
  42                              phys_addr_t base,
  43                              unsigned long offset,
  44                              enum falcon_memory target)
  45 {
  46         u32 cmd = FALCON_DMATRFCMD_SIZE_256B;
  47
  48         if (target == FALCON_MEMORY_IMEM)
  49                 cmd |= FALCON_DMATRFCMD_IMEM;
  50
  51         falcon_writel(falcon, offset, FALCON_DMATRFMOFFS);
  52         falcon_writel(falcon, base, FALCON_DMATRFFBOFFS);
  53         falcon_writel(falcon, cmd, FALCON_DMATRFCMD);
  54
  55         return falcon_dma_wait_idle(falcon);
  56 }
  57
  58 static void falcon_copy_firmware_image(struct falcon *falcon,
  59                                        const struct firmware *firmware)
  60 {
  61         u32 *virt = falcon->firmware.virt;
  62         size_t i;
  63
  64         /* copy the whole thing taking into account endianness */
  65         for (i = 0; i < firmware->size / sizeof(u32); i++)
  66                 virt[i] = le32_to_cpu(((u32 *)firmware->data)[i]);
  67 }
  68
  69 static int falcon_parse_firmware_image(struct falcon *falcon)
  70 {
  71         struct falcon_fw_bin_header_v1 *bin = (void *)falcon->firmware.virt;
  72         struct falcon_fw_os_header_v1 *os;
  73
  74         /* endian problems would show up right here */
  75         if (bin->magic != PCI_VENDOR_ID_NVIDIA) {
  76                 dev_err(falcon->dev, "incorrect firmware magic\n");
  77                 return -EINVAL;
  78         }
  79
  80         /* currently only version 1 is supported */
  81         if (bin->version != 1) {
  82                 dev_err(falcon->dev, "unsupported firmware version\n");
  83                 return -EINVAL;
  84         }
  85
  86         /* check that the firmware size is consistent */
  87         if (bin->size > falcon->firmware.size) {
  88                 dev_err(falcon->dev, "firmware image size inconsistency\n");
  89                 return -EINVAL;
  90         }
  91
  92         os = falcon->firmware.virt + bin->os_header_offset;
  93
  94         falcon->firmware.bin_data.size = bin->os_size;
  95         falcon->firmware.bin_data.offset = bin->os_data_offset;
  96         falcon->firmware.code.offset = os->code_offset;
  97         falcon->firmware.code.size = os->code_size;
  98         falcon->firmware.data.offset = os->data_offset;
  99         falcon->firmware.data.size = os->data_size;
 100
 101         return 0;
 102 }
 103
 104 int falcon_read_firmware(struct falcon *falcon, const char *name)
 105 {
 106         int err;
 107
 108         /* request_firmware prints error if it fails */
 109         err = request_firmware(&falcon->firmware.firmware, name, falcon->dev);
 110         if (err < 0)
 111                 return err;
 112
 113         falcon->firmware.size = falcon->firmware.firmware->size;
 114
 115         return 0;
 116 }
 117
 118 int falcon_load_firmware(struct falcon *falcon)
 119 {
 120         const struct firmware *firmware = falcon->firmware.firmware;
 121         int err;
 122
 123         /* copy firmware image into local area. this also ensures endianness */
 124         falcon_copy_firmware_image(falcon, firmware);
 125
 126         /* parse the image data */
 127         err = falcon_parse_firmware_image(falcon);
 128         if (err < 0) {
 129                 dev_err(falcon->dev, "failed to parse firmware image\n");
 130                 return err;
 131         }
 132
 133         release_firmware(firmware);
 134         falcon->firmware.firmware = NULL;
 135
 136         return 0;
 137 }
 138
 139 int falcon_init(struct falcon *falcon)
 140 {
 141         falcon->firmware.virt = NULL;
 142
 143         return 0;
 144 }
 145
 146 void falcon_exit(struct falcon *falcon)
 147 {
 148         if (falcon->firmware.firmware)
 149                 release_firmware(falcon->firmware.firmware);
 150 }
 151
 152 int falcon_boot(struct falcon *falcon)
 153 {
 154         unsigned long offset;
 155         u32 value;
 156         int err;
 157
 158         if (!falcon->firmware.virt)
 159                 return -EINVAL;
 160
 161         err = readl_poll_timeout(falcon->regs + FALCON_DMACTL, value,
 162                                  (value & (FALCON_DMACTL_IMEM_SCRUBBING |
 163                                            FALCON_DMACTL_DMEM_SCRUBBING)) == 0,
 164                                  10, 10000);
 165         if (err < 0)
 166                 return err;
 167
 168         falcon_writel(falcon, 0, FALCON_DMACTL);
 169
 170         /* setup the address of the binary data so Falcon can access it later */
 171         falcon_writel(falcon, (falcon->firmware.iova +
 172                                falcon->firmware.bin_data.offset) >> 8,
 173                       FALCON_DMATRFBASE);
 174
 175         /* copy the data segment into Falcon internal memory */
 176         for (offset = 0; offset < falcon->firmware.data.size; offset += 256)
 177                 falcon_copy_chunk(falcon,
 178                                   falcon->firmware.data.offset + offset,
 179                                   offset, FALCON_MEMORY_DATA);
 180
 181         /* copy the first code segment into Falcon internal memory */
 182         falcon_copy_chunk(falcon, falcon->firmware.code.offset,
 183                           0, FALCON_MEMORY_IMEM);
 184
 185         /* setup falcon interrupts */
 186         falcon_writel(falcon, FALCON_IRQMSET_EXT(0xff) |
 187                               FALCON_IRQMSET_SWGEN1 |
 188                               FALCON_IRQMSET_SWGEN0 |
 189                               FALCON_IRQMSET_EXTERR |
 190                               FALCON_IRQMSET_HALT |
 191                               FALCON_IRQMSET_WDTMR,
 192                       FALCON_IRQMSET);
 193         falcon_writel(falcon, FALCON_IRQDEST_EXT(0xff) |
 194                               FALCON_IRQDEST_SWGEN1 |
 195                               FALCON_IRQDEST_SWGEN0 |
 196                               FALCON_IRQDEST_EXTERR |
 197                               FALCON_IRQDEST_HALT,
 198                       FALCON_IRQDEST);
 199
 200         /* enable interface */
 201         falcon_writel(falcon, FALCON_ITFEN_MTHDEN |
 202                               FALCON_ITFEN_CTXEN,
 203                       FALCON_ITFEN);
 204
 205         /* boot falcon */
 206         falcon_writel(falcon, 0x00000000, FALCON_BOOTVEC);
 207         falcon_writel(falcon, FALCON_CPUCTL_STARTCPU, FALCON_CPUCTL);
 208
 209         err = falcon_wait_idle(falcon);
 210         if (err < 0) {
 211                 dev_err(falcon->dev, "Falcon boot failed due to timeout\n");
 212                 return err;
 213         }
 214
 215         return 0;
 216 }
 217
 218 void falcon_execute_method(struct falcon *falcon, u32 method, u32 data)
 219 {
 220         falcon_writel(falcon, method >> 2, FALCON_UCLASS_METHOD_OFFSET);
 221         falcon_writel(falcon, data, FALCON_UCLASS_METHOD_DATA);
 222 }