drivers/remoteproc/st_slim_rproc.c

   1 /*
   2  * SLIM core rproc driver
   3  *
   4  * Copyright (C) 2016 STMicroelectronics
   5  *
   6  * Author: Peter Griffin <peter.griffin@linaro.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/err.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/of.h>
  19 #include <linux/of_device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/remoteproc.h>
  22 #include <linux/remoteproc/st_slim_rproc.h>
  23 #include "remoteproc_internal.h"
  24
  25 /* SLIM core registers */
  26 #define SLIM_ID_OFST            0x0
  27 #define SLIM_VER_OFST           0x4
  28
  29 #define SLIM_EN_OFST            0x8
  30 #define SLIM_EN_RUN                     BIT(0)
  31
  32 #define SLIM_CLK_GATE_OFST      0xC
  33 #define SLIM_CLK_GATE_DIS               BIT(0)
  34 #define SLIM_CLK_GATE_RESET             BIT(2)
  35
  36 #define SLIM_SLIM_PC_OFST       0x20
  37
  38 /* DMEM registers */
  39 #define SLIM_REV_ID_OFST        0x0
  40 #define SLIM_REV_ID_MIN_MASK            GENMASK(15, 8)
  41 #define SLIM_REV_ID_MIN(id)             ((id & SLIM_REV_ID_MIN_MASK) >> 8)
  42 #define SLIM_REV_ID_MAJ_MASK            GENMASK(23, 16)
  43 #define SLIM_REV_ID_MAJ(id)             ((id & SLIM_REV_ID_MAJ_MASK) >> 16)
  44
  45
  46 /* peripherals registers */
  47 #define SLIM_STBUS_SYNC_OFST    0xF88
  48 #define SLIM_STBUS_SYNC_DIS             BIT(0)
  49
  50 #define SLIM_INT_SET_OFST       0xFD4
  51 #define SLIM_INT_CLR_OFST       0xFD8
  52 #define SLIM_INT_MASK_OFST      0xFDC
  53
  54 #define SLIM_CMD_CLR_OFST       0xFC8
  55 #define SLIM_CMD_MASK_OFST      0xFCC
  56
  57 static const char *mem_names[ST_SLIM_MEM_MAX] = {
  58         [ST_SLIM_DMEM]  = "dmem",
  59         [ST_SLIM_IMEM]  = "imem",
  60 };
  61
  62 static int slim_clk_get(struct st_slim_rproc *slim_rproc, struct device *dev)
  63 {
  64         int clk, err;
  65
  66         for (clk = 0; clk < ST_SLIM_MAX_CLK; clk++) {
  67                 slim_rproc->clks[clk] = of_clk_get(dev->of_node, clk);
  68                 if (IS_ERR(slim_rproc->clks[clk])) {
  69                         err = PTR_ERR(slim_rproc->clks[clk]);
  70                         if (err == -EPROBE_DEFER)
  71                                 goto err_put_clks;
  72                         slim_rproc->clks[clk] = NULL;
  73                         break;
  74                 }
  75         }
  76
  77         return 0;
  78
  79 err_put_clks:
  80         while (--clk >= 0)
  81                 clk_put(slim_rproc->clks[clk]);
  82
  83         return err;
  84 }
  85
  86 static void slim_clk_disable(struct st_slim_rproc *slim_rproc)
  87 {
  88         int clk;
  89
  90         for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
  91                 clk_disable_unprepare(slim_rproc->clks[clk]);
  92 }
  93
  94 static int slim_clk_enable(struct st_slim_rproc *slim_rproc)
  95 {
  96         int clk, ret;
  97
  98         for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++) {
  99                 ret = clk_prepare_enable(slim_rproc->clks[clk]);
 100                 if (ret)
 101                         goto err_disable_clks;
 102         }
 103
 104         return 0;
 105
 106 err_disable_clks:
 107         while (--clk >= 0)
 108                 clk_disable_unprepare(slim_rproc->clks[clk]);
 109
 110         return ret;
 111 }
 112
 113 /*
 114  * Remoteproc slim specific device handlers
 115  */
 116 static int slim_rproc_start(struct rproc *rproc)
 117 {
 118         struct device *dev = &rproc->dev;
 119         struct st_slim_rproc *slim_rproc = rproc->priv;
 120         unsigned long hw_id, hw_ver, fw_rev;
 121         u32 val;
 122
 123         /* disable CPU pipeline clock & reset CPU pipeline */
 124         val = SLIM_CLK_GATE_DIS | SLIM_CLK_GATE_RESET;
 125         writel(val, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
 126
 127         /* disable SLIM core STBus sync */
 128         writel(SLIM_STBUS_SYNC_DIS, slim_rproc->peri + SLIM_STBUS_SYNC_OFST);
 129
 130         /* enable cpu pipeline clock */
 131         writel(!SLIM_CLK_GATE_DIS,
 132                 slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
 133
 134         /* clear int & cmd mailbox */
 135         writel(~0U, slim_rproc->peri + SLIM_INT_CLR_OFST);
 136         writel(~0U, slim_rproc->peri + SLIM_CMD_CLR_OFST);
 137
 138         /* enable all channels cmd & int */
 139         writel(~0U, slim_rproc->peri + SLIM_INT_MASK_OFST);
 140         writel(~0U, slim_rproc->peri + SLIM_CMD_MASK_OFST);
 141
 142         /* enable cpu */
 143         writel(SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);
 144
 145         hw_id = readl_relaxed(slim_rproc->slimcore + SLIM_ID_OFST);
 146         hw_ver = readl_relaxed(slim_rproc->slimcore + SLIM_VER_OFST);
 147
 148         fw_rev = readl(slim_rproc->mem[ST_SLIM_DMEM].cpu_addr +
 149                         SLIM_REV_ID_OFST);
 150
 151         dev_info(dev, "fw rev:%ld.%ld on SLIM %ld.%ld\n",
 152                  SLIM_REV_ID_MAJ(fw_rev), SLIM_REV_ID_MIN(fw_rev),
 153                  hw_id, hw_ver);
 154
 155         return 0;
 156 }
 157
 158 static int slim_rproc_stop(struct rproc *rproc)
 159 {
 160         struct st_slim_rproc *slim_rproc = rproc->priv;
 161         u32 val;
 162
 163         /* mask all (cmd & int) channels */
 164         writel(0UL, slim_rproc->peri + SLIM_INT_MASK_OFST);
 165         writel(0UL, slim_rproc->peri + SLIM_CMD_MASK_OFST);
 166
 167         /* disable cpu pipeline clock */
 168         writel(SLIM_CLK_GATE_DIS, slim_rproc->slimcore + SLIM_CLK_GATE_OFST);
 169
 170         writel(!SLIM_EN_RUN, slim_rproc->slimcore + SLIM_EN_OFST);
 171
 172         val = readl(slim_rproc->slimcore + SLIM_EN_OFST);
 173         if (val & SLIM_EN_RUN)
 174                 dev_warn(&rproc->dev, "Failed to disable SLIM");
 175
 176         dev_dbg(&rproc->dev, "slim stopped\n");
 177
 178         return 0;
 179 }
 180
 181 static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
 182 {
 183         struct st_slim_rproc *slim_rproc = rproc->priv;
 184         void *va = NULL;
 185         int i;
 186
 187         for (i = 0; i < ST_SLIM_MEM_MAX; i++) {
 188                 if (da != slim_rproc->mem[i].bus_addr)
 189                         continue;
 190
 191                 if (len <= slim_rproc->mem[i].size) {
 192                         /* __force to make sparse happy with type conversion */
 193                         va = (__force void *)slim_rproc->mem[i].cpu_addr;
 194                         break;
 195                 }
 196         }
 197
 198         dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
 199
 200         return va;
 201 }
 202
 203 static const struct rproc_ops slim_rproc_ops = {
 204         .start          = slim_rproc_start,
 205         .stop           = slim_rproc_stop,
 206         .da_to_va       = slim_rproc_da_to_va,
 207 };
 208
 209 /*
 210  * Firmware handler operations: sanity, boot address, load ...
 211  */
 212
 213 static struct resource_table empty_rsc_tbl = {
 214         .ver = 1,
 215         .num = 0,
 216 };
 217
 218 static struct resource_table *slim_rproc_find_rsc_table(struct rproc *rproc,
 219                                                const struct firmware *fw,
 220                                                int *tablesz)
 221 {
 222         *tablesz = sizeof(empty_rsc_tbl);
 223         return &empty_rsc_tbl;
 224 }
 225
 226 static struct rproc_fw_ops slim_rproc_fw_ops = {
 227         .find_rsc_table = slim_rproc_find_rsc_table,
 228 };
 229
 230 /**
 231  * st_slim_rproc_alloc() - allocate and initialise slim rproc
 232  * @pdev: Pointer to the platform_device struct
 233  * @fw_name: Name of firmware for rproc to use
 234  *
 235  * Function for allocating and initialising a slim rproc for use by
 236  * device drivers whose IP is based around the SLIM core. It
 237  * obtains and enables any clocks required by the SLIM core and also
 238  * ioremaps the various IO.
 239  *
 240  * Returns st_slim_rproc pointer or PTR_ERR() on error.
 241  */
 242
 243 struct st_slim_rproc *st_slim_rproc_alloc(struct platform_device *pdev,
 244                                 char *fw_name)
 245 {
 246         struct device *dev = &pdev->dev;
 247         struct st_slim_rproc *slim_rproc;
 248         struct device_node *np = dev->of_node;
 249         struct rproc *rproc;
 250         struct resource *res;
 251         int err, i;
 252         const struct rproc_fw_ops *elf_ops;
 253
 254         if (!fw_name)
 255                 return ERR_PTR(-EINVAL);
 256
 257         if (!of_device_is_compatible(np, "st,slim-rproc"))
 258                 return ERR_PTR(-EINVAL);
 259
 260         rproc = rproc_alloc(dev, np->name, &slim_rproc_ops,
 261                         fw_name, sizeof(*slim_rproc));
 262         if (!rproc)
 263                 return ERR_PTR(-ENOMEM);
 264
 265         rproc->has_iommu = false;
 266
 267         slim_rproc = rproc->priv;
 268         slim_rproc->rproc = rproc;
 269
 270         elf_ops = rproc->fw_ops;
 271         /* Use some generic elf ops */
 272         slim_rproc_fw_ops.load = elf_ops->load;
 273         slim_rproc_fw_ops.sanity_check = elf_ops->sanity_check;
 274
 275         rproc->fw_ops = &slim_rproc_fw_ops;
 276
 277         /* get imem and dmem */
 278         for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
 279                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 280                                                 mem_names[i]);
 281
 282                 slim_rproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
 283                 if (IS_ERR(slim_rproc->mem[i].cpu_addr)) {
 284                         dev_err(&pdev->dev, "devm_ioremap_resource failed\n");
 285                         err = PTR_ERR(slim_rproc->mem[i].cpu_addr);
 286                         goto err;
 287                 }
 288                 slim_rproc->mem[i].bus_addr = res->start;
 289                 slim_rproc->mem[i].size = resource_size(res);
 290         }
 291
 292         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "slimcore");
 293         slim_rproc->slimcore = devm_ioremap_resource(dev, res);
 294         if (IS_ERR(slim_rproc->slimcore)) {
 295                 dev_err(&pdev->dev, "failed to ioremap slimcore IO\n");
 296                 err = PTR_ERR(slim_rproc->slimcore);
 297                 goto err;
 298         }
 299
 300         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "peripherals");
 301         slim_rproc->peri = devm_ioremap_resource(dev, res);
 302         if (IS_ERR(slim_rproc->peri)) {
 303                 dev_err(&pdev->dev, "failed to ioremap peripherals IO\n");
 304                 err = PTR_ERR(slim_rproc->peri);
 305                 goto err;
 306         }
 307
 308         err = slim_clk_get(slim_rproc, dev);
 309         if (err)
 310                 goto err;
 311
 312         err = slim_clk_enable(slim_rproc);
 313         if (err) {
 314                 dev_err(dev, "Failed to enable clocks\n");
 315                 goto err_clk_put;
 316         }
 317
 318         /* Register as a remoteproc device */
 319         err = rproc_add(rproc);
 320         if (err) {
 321                 dev_err(dev, "registration of slim remoteproc failed\n");
 322                 goto err_clk_dis;
 323         }
 324
 325         return slim_rproc;
 326
 327 err_clk_dis:
 328         slim_clk_disable(slim_rproc);
 329 err_clk_put:
 330         for (i = 0; i < ST_SLIM_MAX_CLK && slim_rproc->clks[i]; i++)
 331                 clk_put(slim_rproc->clks[i]);
 332 err:
 333         rproc_free(rproc);
 334         return ERR_PTR(err);
 335 }
 336 EXPORT_SYMBOL(st_slim_rproc_alloc);
 337
 338 /**
 339   * st_slim_rproc_put() - put slim rproc resources
 340   * @slim_rproc: Pointer to the st_slim_rproc struct
 341   *
 342   * Function for calling respective _put() functions on slim_rproc resources.
 343   *
 344   */
 345 void st_slim_rproc_put(struct st_slim_rproc *slim_rproc)
 346 {
 347         int clk;
 348
 349         if (!slim_rproc)
 350                 return;
 351
 352         slim_clk_disable(slim_rproc);
 353
 354         for (clk = 0; clk < ST_SLIM_MAX_CLK && slim_rproc->clks[clk]; clk++)
 355                 clk_put(slim_rproc->clks[clk]);
 356
 357         rproc_del(slim_rproc->rproc);
 358         rproc_free(slim_rproc->rproc);
 359 }
 360 EXPORT_SYMBOL(st_slim_rproc_put);
 361
 362 MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
 363 MODULE_DESCRIPTION("STMicroelectronics SLIM core rproc driver");
 364 MODULE_LICENSE("GPL v2");