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