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