drivers/remoteproc/wkup_m3_rproc.c

   1 /*
   2  * TI AMx3 Wakeup M3 Remote Processor driver
   3  *
   4  * Copyright (C) 2014-2015 Texas Instruments, Inc.
   5  *
   6  * Dave Gerlach <d-gerlach@ti.com>
   7  * Suman Anna <s-anna@ti.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/err.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/of_device.h>
  24 #include <linux/of_address.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/remoteproc.h>
  28
  29 #include <linux/platform_data/wkup_m3.h>
  30
  31 #include "remoteproc_internal.h"
  32
  33 #define WKUPM3_MEM_MAX  2
  34
  35 /**
  36  * struct wkup_m3_mem - WkupM3 internal memory structure
  37  * @cpu_addr: MPU virtual address of the memory region
  38  * @bus_addr: Bus address used to access the memory region
  39  * @dev_addr: Device address from Wakeup M3 view
  40  * @size: Size of the memory region
  41  */
  42 struct wkup_m3_mem {
  43         void __iomem *cpu_addr;
  44         phys_addr_t bus_addr;
  45         u32 dev_addr;
  46         size_t size;
  47 };
  48
  49 /**
  50  * struct wkup_m3_rproc - WkupM3 remote processor state
  51  * @rproc: rproc handle
  52  * @pdev: pointer to platform device
  53  * @mem: WkupM3 memory information
  54  */
  55 struct wkup_m3_rproc {
  56         struct rproc *rproc;
  57         struct platform_device *pdev;
  58         struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
  59 };
  60
  61 static int wkup_m3_rproc_start(struct rproc *rproc)
  62 {
  63         struct wkup_m3_rproc *wkupm3 = rproc->priv;
  64         struct platform_device *pdev = wkupm3->pdev;
  65         struct device *dev = &pdev->dev;
  66         struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
  67
  68         if (pdata->deassert_reset(pdev, pdata->reset_name)) {
  69                 dev_err(dev, "Unable to reset wkup_m3!\n");
  70                 return -ENODEV;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static int wkup_m3_rproc_stop(struct rproc *rproc)
  77 {
  78         struct wkup_m3_rproc *wkupm3 = rproc->priv;
  79         struct platform_device *pdev = wkupm3->pdev;
  80         struct device *dev = &pdev->dev;
  81         struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
  82
  83         if (pdata->assert_reset(pdev, pdata->reset_name)) {
  84                 dev_err(dev, "Unable to assert reset of wkup_m3!\n");
  85                 return -ENODEV;
  86         }
  87
  88         return 0;
  89 }
  90
  91 static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
  92 {
  93         struct wkup_m3_rproc *wkupm3 = rproc->priv;
  94         void *va = NULL;
  95         int i;
  96         u32 offset;
  97
  98         if (len <= 0)
  99                 return NULL;
 100
 101         for (i = 0; i < WKUPM3_MEM_MAX; i++) {
 102                 if (da >= wkupm3->mem[i].dev_addr && da + len <=
 103                     wkupm3->mem[i].dev_addr +  wkupm3->mem[i].size) {
 104                         offset = da -  wkupm3->mem[i].dev_addr;
 105                         /* __force to make sparse happy with type conversion */
 106                         va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
 107                         break;
 108                 }
 109         }
 110
 111         return va;
 112 }
 113
 114 static struct rproc_ops wkup_m3_rproc_ops = {
 115         .start          = wkup_m3_rproc_start,
 116         .stop           = wkup_m3_rproc_stop,
 117         .da_to_va       = wkup_m3_rproc_da_to_va,
 118 };
 119
 120 static const struct of_device_id wkup_m3_rproc_of_match[] = {
 121         { .compatible = "ti,am3352-wkup-m3", },
 122         { .compatible = "ti,am4372-wkup-m3", },
 123         {},
 124 };
 125 MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
 126
 127 static int wkup_m3_rproc_probe(struct platform_device *pdev)
 128 {
 129         struct device *dev = &pdev->dev;
 130         struct wkup_m3_platform_data *pdata = dev->platform_data;
 131         /* umem always needs to be processed first */
 132         const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
 133         struct wkup_m3_rproc *wkupm3;
 134         const char *fw_name;
 135         struct rproc *rproc;
 136         struct resource *res;
 137         const __be32 *addrp;
 138         u32 l4_offset = 0;
 139         u64 size;
 140         int ret;
 141         int i;
 142
 143         if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
 144               pdata->reset_name)) {
 145                 dev_err(dev, "Platform data missing!\n");
 146                 return -ENODEV;
 147         }
 148
 149         ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
 150                                       &fw_name);
 151         if (ret) {
 152                 dev_err(dev, "No firmware filename given\n");
 153                 return -ENODEV;
 154         }
 155
 156         pm_runtime_enable(&pdev->dev);
 157         ret = pm_runtime_get_sync(&pdev->dev);
 158         if (ret < 0) {
 159                 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
 160                 goto err;
 161         }
 162
 163         rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
 164                             fw_name, sizeof(*wkupm3));
 165         if (!rproc) {
 166                 ret = -ENOMEM;
 167                 goto err;
 168         }
 169
 170         wkupm3 = rproc->priv;
 171         wkupm3->rproc = rproc;
 172         wkupm3->pdev = pdev;
 173
 174         for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
 175                 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 176                                                    mem_names[i]);
 177                 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
 178                 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
 179                         dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
 180                                 i);
 181                         ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
 182                         goto err;
 183                 }
 184                 wkupm3->mem[i].bus_addr = res->start;
 185                 wkupm3->mem[i].size = resource_size(res);
 186                 addrp = of_get_address(dev->of_node, i, &size, NULL);
 187                 /*
 188                  * The wkupm3 has umem at address 0 in its view, so the device
 189                  * addresses for each memory region is computed as a relative
 190                  * offset of the bus address for umem, and therefore needs to be
 191                  * processed first.
 192                  */
 193                 if (!strcmp(mem_names[i], "umem"))
 194                         l4_offset = be32_to_cpu(*addrp);
 195                 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
 196         }
 197
 198         dev_set_drvdata(dev, rproc);
 199
 200         ret = rproc_add(rproc);
 201         if (ret) {
 202                 dev_err(dev, "rproc_add failed\n");
 203                 goto err_put_rproc;
 204         }
 205
 206         return 0;
 207
 208 err_put_rproc:
 209         rproc_put(rproc);
 210 err:
 211         pm_runtime_put_noidle(dev);
 212         pm_runtime_disable(dev);
 213         return ret;
 214 }
 215
 216 static int wkup_m3_rproc_remove(struct platform_device *pdev)
 217 {
 218         struct rproc *rproc = platform_get_drvdata(pdev);
 219
 220         rproc_del(rproc);
 221         rproc_put(rproc);
 222         pm_runtime_put_sync(&pdev->dev);
 223         pm_runtime_disable(&pdev->dev);
 224
 225         return 0;
 226 }
 227
 228 #ifdef CONFIG_PM
 229 static int wkup_m3_rpm_suspend(struct device *dev)
 230 {
 231         return -EBUSY;
 232 }
 233
 234 static int wkup_m3_rpm_resume(struct device *dev)
 235 {
 236         return 0;
 237 }
 238 #endif
 239
 240 static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
 241         SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
 242 };
 243
 244 static struct platform_driver wkup_m3_rproc_driver = {
 245         .probe = wkup_m3_rproc_probe,
 246         .remove = wkup_m3_rproc_remove,
 247         .driver = {
 248                 .name = "wkup_m3_rproc",
 249                 .of_match_table = wkup_m3_rproc_of_match,
 250                 .pm = &wkup_m3_rproc_pm_ops,
 251         },
 252 };
 253
 254 module_platform_driver(wkup_m3_rproc_driver);
 255
 256 MODULE_LICENSE("GPL v2");
 257 MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
 258 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");