drivers/remoteproc/wkup_m3_rproc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * TI AMx3 Wakeup M3 Remote Processor driver
   4  *
   5  * Copyright (C) 2014-2015 Texas Instruments, Inc.
   6  *
   7  * Dave Gerlach <d-gerlach@ti.com>
   8  * Suman Anna <s-anna@ti.com>
   9  */
  10
  11 #include <linux/err.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/of_device.h>
  16 #include <linux/of_address.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/remoteproc.h>
  20 #include <linux/reset.h>
  21
  22 #include <linux/platform_data/wkup_m3.h>
  23
  24 #include "remoteproc_internal.h"
  25
  26 #define WKUPM3_MEM_MAX  2
  27
  28 /**
  29  * struct wkup_m3_mem - WkupM3 internal memory structure
  30  * @cpu_addr: MPU virtual address of the memory region
  31  * @bus_addr: Bus address used to access the memory region
  32  * @dev_addr: Device address from Wakeup M3 view
  33  * @size: Size of the memory region
  34  */
  35 struct wkup_m3_mem {
  36         void __iomem *cpu_addr;
  37         phys_addr_t bus_addr;
  38         u32 dev_addr;
  39         size_t size;
  40 };
  41
  42 /**
  43  * struct wkup_m3_rproc - WkupM3 remote processor state
  44  * @rproc: rproc handle
  45  * @pdev: pointer to platform device
  46  * @mem: WkupM3 memory information
  47  * @rsts: reset control
  48  */
  49 struct wkup_m3_rproc {
  50         struct rproc *rproc;
  51         struct platform_device *pdev;
  52         struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
  53         struct reset_control *rsts;
  54 };
  55
  56 static int wkup_m3_rproc_start(struct rproc *rproc)
  57 {
  58         struct wkup_m3_rproc *wkupm3 = rproc->priv;
  59         struct platform_device *pdev = wkupm3->pdev;
  60         struct device *dev = &pdev->dev;
  61         struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
  62         int error = 0;
  63
  64         error = reset_control_deassert(wkupm3->rsts);
  65
  66         if (!wkupm3->rsts && pdata->deassert_reset(pdev, pdata->reset_name)) {
  67                 dev_err(dev, "Unable to reset wkup_m3!\n");
  68                 error = -ENODEV;
  69         }
  70
  71         return error;
  72 }
  73
  74 static int wkup_m3_rproc_stop(struct rproc *rproc)
  75 {
  76         struct wkup_m3_rproc *wkupm3 = rproc->priv;
  77         struct platform_device *pdev = wkupm3->pdev;
  78         struct device *dev = &pdev->dev;
  79         struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
  80         int error = 0;
  81
  82         error = reset_control_assert(wkupm3->rsts);
  83
  84         if (!wkupm3->rsts && pdata->assert_reset(pdev, pdata->reset_name)) {
  85                 dev_err(dev, "Unable to assert reset of wkup_m3!\n");
  86                 error = -ENODEV;
  87         }
  88
  89         return error;
  90 }
  91
  92 static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len)
  93 {
  94         struct wkup_m3_rproc *wkupm3 = rproc->priv;
  95         void *va = NULL;
  96         int i;
  97         u32 offset;
  98
  99         if (len == 0)
 100                 return NULL;
 101
 102         for (i = 0; i < WKUPM3_MEM_MAX; i++) {
 103                 if (da >= wkupm3->mem[i].dev_addr && da + len <=
 104                     wkupm3->mem[i].dev_addr +  wkupm3->mem[i].size) {
 105                         offset = da -  wkupm3->mem[i].dev_addr;
 106                         /* __force to make sparse happy with type conversion */
 107                         va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
 108                         break;
 109                 }
 110         }
 111
 112         return va;
 113 }
 114
 115 static const struct rproc_ops wkup_m3_rproc_ops = {
 116         .start          = wkup_m3_rproc_start,
 117         .stop           = wkup_m3_rproc_stop,
 118         .da_to_va       = wkup_m3_rproc_da_to_va,
 119 };
 120
 121 static const struct of_device_id wkup_m3_rproc_of_match[] = {
 122         { .compatible = "ti,am3352-wkup-m3", },
 123         { .compatible = "ti,am4372-wkup-m3", },
 124         {},
 125 };
 126 MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
 127
 128 static int wkup_m3_rproc_probe(struct platform_device *pdev)
 129 {
 130         struct device *dev = &pdev->dev;
 131         struct wkup_m3_platform_data *pdata = dev->platform_data;
 132         /* umem always needs to be processed first */
 133         const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
 134         struct wkup_m3_rproc *wkupm3;
 135         const char *fw_name;
 136         struct rproc *rproc;
 137         struct resource *res;
 138         const __be32 *addrp;
 139         u32 l4_offset = 0;
 140         u64 size;
 141         int ret;
 142         int i;
 143
 144         ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
 145                                       &fw_name);
 146         if (ret) {
 147                 dev_err(dev, "No firmware filename given\n");
 148                 return -ENODEV;
 149         }
 150
 151         pm_runtime_enable(&pdev->dev);
 152         ret = pm_runtime_get_sync(&pdev->dev);
 153         if (ret < 0) {
 154                 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
 155                 goto err;
 156         }
 157
 158         rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
 159                             fw_name, sizeof(*wkupm3));
 160         if (!rproc) {
 161                 ret = -ENOMEM;
 162                 goto err;
 163         }
 164
 165         rproc->auto_boot = false;
 166
 167         wkupm3 = rproc->priv;
 168         wkupm3->rproc = rproc;
 169         wkupm3->pdev = pdev;
 170
 171         wkupm3->rsts = devm_reset_control_get_optional_shared(dev, "rstctrl");
 172         if (IS_ERR(wkupm3->rsts))
 173                 return PTR_ERR(wkupm3->rsts);
 174         if (!wkupm3->rsts) {
 175                 if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
 176                       pdata->reset_name)) {
 177                         dev_err(dev, "Platform data missing!\n");
 178                         ret = -ENODEV;
 179                         goto err_put_rproc;
 180                 }
 181         }
 182
 183         for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
 184                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 185                                                    mem_names[i]);
 186                 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
 187                 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
 188                         dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
 189                                 i);
 190                         ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
 191                         goto err_put_rproc;
 192                 }
 193                 wkupm3->mem[i].bus_addr = res->start;
 194                 wkupm3->mem[i].size = resource_size(res);
 195                 addrp = of_get_address(dev->of_node, i, &size, NULL);
 196                 /*
 197                  * The wkupm3 has umem at address 0 in its view, so the device
 198                  * addresses for each memory region is computed as a relative
 199                  * offset of the bus address for umem, and therefore needs to be
 200                  * processed first.
 201                  */
 202                 if (!strcmp(mem_names[i], "umem"))
 203                         l4_offset = be32_to_cpu(*addrp);
 204                 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
 205         }
 206
 207         dev_set_drvdata(dev, rproc);
 208
 209         ret = rproc_add(rproc);
 210         if (ret) {
 211                 dev_err(dev, "rproc_add failed\n");
 212                 goto err_put_rproc;
 213         }
 214
 215         return 0;
 216
 217 err_put_rproc:
 218         rproc_free(rproc);
 219 err:
 220         pm_runtime_put_noidle(dev);
 221         pm_runtime_disable(dev);
 222         return ret;
 223 }
 224
 225 static int wkup_m3_rproc_remove(struct platform_device *pdev)
 226 {
 227         struct rproc *rproc = platform_get_drvdata(pdev);
 228
 229         rproc_del(rproc);
 230         rproc_free(rproc);
 231         pm_runtime_put_sync(&pdev->dev);
 232         pm_runtime_disable(&pdev->dev);
 233
 234         return 0;
 235 }
 236
 237 #ifdef CONFIG_PM
 238 static int wkup_m3_rpm_suspend(struct device *dev)
 239 {
 240         return -EBUSY;
 241 }
 242
 243 static int wkup_m3_rpm_resume(struct device *dev)
 244 {
 245         return 0;
 246 }
 247 #endif
 248
 249 static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
 250         SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
 251 };
 252
 253 static struct platform_driver wkup_m3_rproc_driver = {
 254         .probe = wkup_m3_rproc_probe,
 255         .remove = wkup_m3_rproc_remove,
 256         .driver = {
 257                 .name = "wkup_m3_rproc",
 258                 .of_match_table = wkup_m3_rproc_of_match,
 259                 .pm = &wkup_m3_rproc_pm_ops,
 260         },
 261 };
 262
 263 module_platform_driver(wkup_m3_rproc_driver);
 264
 265 MODULE_LICENSE("GPL v2");
 266 MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
 267 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");