drivers/remoteproc/st_slim_rproc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * SLIM core rproc driver
   4  *
   5  * Copyright (C) 2016 STMicroelectronics
   6  *
   7  * Author: Peter Griffin <peter.griffin@linaro.org>
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/err.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/remoteproc.h>
  17 #include <linux/remoteproc/st_slim_rproc.h>
  18 #include "remoteproc_internal.h"
  19
  20 /* SLIM core registers */
  21 #define SLIM_ID_OFST            0x0
  22 #define SLIM_VER_OFST           0x4
  23
  24 #define SLIM_EN_OFST            0x8
  25 #define SLIM_EN_RUN                     BIT(0)
  26
  27 #define SLIM_CLK_GATE_OFST      0xC
  28 #define SLIM_CLK_GATE_DIS               BIT(0)
  29 #define SLIM_CLK_GATE_RESET             BIT(2)
  30
  31 #define SLIM_SLIM_PC_OFST       0x20
  32
  33 /* DMEM registers */
  34 #define SLIM_REV_ID_OFST        0x0
  35 #define SLIM_REV_ID_MIN_MASK            GENMASK(15, 8)
  36 #define SLIM_REV_ID_MIN(id)             ((id & SLIM_REV_ID_MIN_MASK) >> 8)
  37 #define SLIM_REV_ID_MAJ_MASK            GENMASK(23, 16)
  38 #define SLIM_REV_ID_MAJ(id)             ((id & SLIM_REV_ID_MAJ_MASK) >> 16)
  39
  40
  41 /* peripherals registers */
  42 #define SLIM_STBUS_SYNC_OFST    0xF88
  43 #define SLIM_STBUS_SYNC_DIS             BIT(0)
  44
  45 #define SLIM_INT_SET_OFST       0xFD4
  46 #define SLIM_INT_CLR_OFST       0xFD8
  47 #define SLIM_INT_MASK_OFST      0xFDC
  48
  49 #define SLIM_CMD_CLR_OFST       0xFC8
  50 #define SLIM_CMD_MASK_OFST      0xFCC
  51
  52 static const char *mem_names[ST_SLIM_MEM_MAX] = {
  53         [ST_SLIM_DMEM]  = "dmem",
  54         [ST_SLIM_IMEM]  = "imem",
  55 };
  56
  57 static int slim_clk_get(struct st_slim_rproc *slim_rproc, struct device *dev)
  58 {
  59         int clk, err;
  60
  61         for (clk = 0; clk < ST_SLIM_MAX_CLK; clk++) {
  62                 slim_rproc->clks[clk] = of_clk_get(dev->of_node, clk);
  63                 if (IS_ERR(slim_rproc->clks[clk])) {
  64                         err = PTR_ERR(slim_rproc->clks[clk]);
  65                         if (err == -EPROBE_DEFER)
  66                                 goto err_put_clks;
  67                         slim_rproc->clks[clk] = NULL;
  68                         break;
  69                 }
  70         }
  71
  72         return 0;
  73
  74 err_put_clks:
  75         while (--clk >= 0)
  76                 clk_put(slim_rproc->clks[clk]);
  77
  78         return err;
  79 }
  80
  81 static void slim_clk_disable(struct st_slim_rproc *slim_rproc)
  82 {
  83         int clk;
  84
  85         for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
  86                 clk_disable_unprepare(slim_rproc->clks[clk]);
  87 }
  88
  89 static int slim_clk_enable(struct st_slim_rproc *slim_rproc)
  90 {
  91         int clk, ret;
  92
  93         for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++) {
  94                 ret = clk_prepare_enable(slim_rproc->clks[clk]);
  95                 if (ret)
  96                         goto err_disable_clks;
  97         }
  98
  99         return 0;
 100
 101 err_disable_clks:
 102         while (--clk >= 0)
 103                 clk_disable_unprepare(slim_rproc->clks[clk]);
 104
 105         return ret;
 106 }
 107
 108 /*
 109  * Remoteproc slim specific device handlers
 110  */
 111 static int slim_rproc_start(struct rproc *rproc)
 112 {
 113         struct device *dev = &rproc->dev;
 114         struct st_slim_rproc *slim_rproc = rproc->priv;
 115         unsigned long hw_id, hw_ver, fw_rev;
 116         u32 val;
 117
 118         /* disable CPU pipeline clock & reset CPU pipeline */
 119         val = SLIM_CLK_GATE_DIS | SLIM_CLK_GATE_RESET;
 120         writel(val, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
 121
 122         /* disable SLIM core STBus sync */
 123         writel(SLIM_STBUS_SYNC_DIS, slim_rproc->peri + SLIM_STBUS_SYNC_OFST);
 124
 125         /* enable cpu pipeline clock */
 126         writel(!SLIM_CLK_GATE_DIS,
 127                 slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
 128
 129         /* clear int & cmd mailbox */
 130         writel(~0U, slim_rproc->peri + SLIM_INT_CLR_OFST);
 131         writel(~0U, slim_rproc->peri + SLIM_CMD_CLR_OFST);
 132
 133         /* enable all channels cmd & int */
 134         writel(~0U, slim_rproc->peri + SLIM_INT_MASK_OFST);
 135         writel(~0U, slim_rproc->peri + SLIM_CMD_MASK_OFST);
 136
 137         /* enable cpu */
 138         writel(SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);
 139
 140         hw_id = readl_relaxed(slim_rproc->slimcore + SLIM_ID_OFST);
 141         hw_ver = readl_relaxed(slim_rproc->slimcore + SLIM_VER_OFST);
 142
 143         fw_rev = readl(slim_rproc->mem[ST_SLIM_DMEM].cpu_addr +
 144                         SLIM_REV_ID_OFST);
 145
 146         dev_info(dev, "fw rev:%ld.%ld on SLIM %ld.%ld\n",
 147                  SLIM_REV_ID_MAJ(fw_rev), SLIM_REV_ID_MIN(fw_rev),
 148                  hw_id, hw_ver);
 149
 150         return 0;
 151 }
 152
 153 static int slim_rproc_stop(struct rproc *rproc)
 154 {
 155         struct st_slim_rproc *slim_rproc = rproc->priv;
 156         u32 val;
 157
 158         /* mask all (cmd & int) channels */
 159         writel(0UL, slim_rproc->peri + SLIM_INT_MASK_OFST);
 160         writel(0UL, slim_rproc->peri + SLIM_CMD_MASK_OFST);
 161
 162         /* disable cpu pipeline clock */
 163         writel(SLIM_CLK_GATE_DIS, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
 164
 165         writel(!SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);
 166
 167         val = readl(slim_rproc->slimcore + SLIM_EN_OFST);
 168         if (val & SLIM_EN_RUN)
 169                 dev_warn(&rproc->dev, "Failed to disable SLIM");
 170
 171         dev_dbg(&rproc->dev, "slim stopped\n");
 172
 173         return 0;
 174 }
 175
 176 static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
 177 {
 178         struct st_slim_rproc *slim_rproc = rproc->priv;
 179         void *va = NULL;
 180         int i;
 181
 182         for (i = 0; i < ST_SLIM_MEM_MAX; i++) {
 183                 if (da != slim_rproc->mem[i].bus_addr)
 184                         continue;
 185
 186                 if (len <= slim_rproc->mem[i].size) {
 187                         /* __force to make sparse happy with type conversion */
 188                         va = (__force void *)slim_rproc->mem[i].cpu_addr;
 189                         break;
 190                 }
 191         }
 192
 193         dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%zx va = 0x%pK\n",
 194                 da, len, va);
 195
 196         return va;
 197 }
 198
 199 static const struct rproc_ops slim_rproc_ops = {
 200         .start          = slim_rproc_start,
 201         .stop           = slim_rproc_stop,
 202         .da_to_va       = slim_rproc_da_to_va,
 203         .get_boot_addr  = rproc_elf_get_boot_addr,
 204         .load           = rproc_elf_load_segments,
 205         .sanity_check   = rproc_elf_sanity_check,
 206 };
 207
 208 /**
 209  * st_slim_rproc_alloc() - allocate and initialise slim rproc
 210  * @pdev: Pointer to the platform_device struct
 211  * @fw_name: Name of firmware for rproc to use
 212  *
 213  * Function for allocating and initialising a slim rproc for use by
 214  * device drivers whose IP is based around the SLIM core. It
 215  * obtains and enables any clocks required by the SLIM core and also
 216  * ioremaps the various IO.
 217  *
 218  * Return: st_slim_rproc pointer or PTR_ERR() on error.
 219  */
 220
 221 struct st_slim_rproc *st_slim_rproc_alloc(struct platform_device *pdev,
 222                                 char *fw_name)
 223 {
 224         struct device *dev = &pdev->dev;
 225         struct st_slim_rproc *slim_rproc;
 226         struct device_node *np = dev->of_node;
 227         struct rproc *rproc;
 228         struct resource *res;
 229         int err, i;
 230
 231         if (!fw_name)
 232                 return ERR_PTR(-EINVAL);
 233
 234         if (!of_device_is_compatible(np, "st,slim-rproc"))
 235                 return ERR_PTR(-EINVAL);
 236
 237         rproc = rproc_alloc(dev, np->name, &slim_rproc_ops,
 238                         fw_name, sizeof(*slim_rproc));
 239         if (!rproc)
 240                 return ERR_PTR(-ENOMEM);
 241
 242         rproc->has_iommu = false;
 243
 244         slim_rproc = rproc->priv;
 245         slim_rproc->rproc = rproc;
 246
 247         /* get imem and dmem */
 248         for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
 249                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 250                                                 mem_names[i]);
 251
 252                 slim_rproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
 253                 if (IS_ERR(slim_rproc->mem[i].cpu_addr)) {
 254                         dev_err(&pdev->dev, "devm_ioremap_resource failed\n");
 255                         err = PTR_ERR(slim_rproc->mem[i].cpu_addr);
 256                         goto err;
 257                 }
 258                 slim_rproc->mem[i].bus_addr = res->start;
 259                 slim_rproc->mem[i].size = resource_size(res);
 260         }
 261
 262         slim_rproc->slimcore = devm_platform_ioremap_resource_byname(pdev, "slimcore");
 263         if (IS_ERR(slim_rproc->slimcore)) {
 264                 dev_err(&pdev->dev, "failed to ioremap slimcore IO\n");
 265                 err = PTR_ERR(slim_rproc->slimcore);
 266                 goto err;
 267         }
 268
 269         slim_rproc->peri = devm_platform_ioremap_resource_byname(pdev, "peripherals");
 270         if (IS_ERR(slim_rproc->peri)) {
 271                 dev_err(&pdev->dev, "failed to ioremap peripherals IO\n");
 272                 err = PTR_ERR(slim_rproc->peri);
 273                 goto err;
 274         }
 275
 276         err = slim_clk_get(slim_rproc, dev);
 277         if (err)
 278                 goto err;
 279
 280         err = slim_clk_enable(slim_rproc);
 281         if (err) {
 282                 dev_err(dev, "Failed to enable clocks\n");
 283                 goto err_clk_put;
 284         }
 285
 286         /* Register as a remoteproc device */
 287         err = rproc_add(rproc);
 288         if (err) {
 289                 dev_err(dev, "registration of slim remoteproc failed\n");
 290                 goto err_clk_dis;
 291         }
 292
 293         return slim_rproc;
 294
 295 err_clk_dis:
 296         slim_clk_disable(slim_rproc);
 297 err_clk_put:
 298         for (i = 0; i < ST_SLIM_MAX_CLK && slim_rproc->clks[i]; i++)
 299                 clk_put(slim_rproc->clks[i]);
 300 err:
 301         rproc_free(rproc);
 302         return ERR_PTR(err);
 303 }
 304 EXPORT_SYMBOL(st_slim_rproc_alloc);
 305
 306 /**
 307   * st_slim_rproc_put() - put slim rproc resources
 308   * @slim_rproc: Pointer to the st_slim_rproc struct
 309   *
 310   * Function for calling respective _put() functions on slim_rproc resources.
 311   *
 312   */
 313 void st_slim_rproc_put(struct st_slim_rproc *slim_rproc)
 314 {
 315         int clk;
 316
 317         if (!slim_rproc)
 318                 return;
 319
 320         slim_clk_disable(slim_rproc);
 321
 322         for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
 323                 clk_put(slim_rproc->clks[clk]);
 324
 325         rproc_del(slim_rproc->rproc);
 326         rproc_free(slim_rproc->rproc);
 327 }
 328 EXPORT_SYMBOL(st_slim_rproc_put);
 329
 330 MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
 331 MODULE_DESCRIPTION("STMicroelectronics SLIM core rproc driver");
 332 MODULE_LICENSE("GPL v2");