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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * TI AMx3 Wakeup M3 Remote Processor driver4 *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.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 227 28/**29 * struct wkup_m3_mem - WkupM3 internal memory structure30 * @cpu_addr: MPU virtual address of the memory region31 * @bus_addr: Bus address used to access the memory region32 * @dev_addr: Device address from Wakeup M3 view33 * @size: Size of the memory region34 */35struct 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 state44 * @rproc: rproc handle45 * @pdev: pointer to platform device46 * @mem: WkupM3 memory information47 * @rsts: reset control48 */49struct 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 56static 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 74static 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 92static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)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 115static 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 121static const struct of_device_id wkup_m3_rproc_of_match[] = {122 { .compatible = "ti,am3352-wkup-m3", },123 { .compatible = "ti,am4372-wkup-m3", },124 {},125};126MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);127 128static 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 rproc->sysfs_read_only = true;167 168 wkupm3 = rproc->priv;169 wkupm3->rproc = rproc;170 wkupm3->pdev = pdev;171 172 wkupm3->rsts = devm_reset_control_get_optional_shared(dev, "rstctrl");173 if (IS_ERR(wkupm3->rsts))174 return PTR_ERR(wkupm3->rsts);175 if (!wkupm3->rsts) {176 if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&177 pdata->reset_name)) {178 dev_err(dev, "Platform data missing!\n");179 ret = -ENODEV;180 goto err_put_rproc;181 }182 }183 184 for (i = 0; i < ARRAY_SIZE(mem_names); i++) {185 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,186 mem_names[i]);187 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);188 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {189 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",190 i);191 ret = PTR_ERR(wkupm3->mem[i].cpu_addr);192 goto err_put_rproc;193 }194 wkupm3->mem[i].bus_addr = res->start;195 wkupm3->mem[i].size = resource_size(res);196 addrp = of_get_address(dev->of_node, i, &size, NULL);197 /*198 * The wkupm3 has umem at address 0 in its view, so the device199 * addresses for each memory region is computed as a relative200 * offset of the bus address for umem, and therefore needs to be201 * processed first.202 */203 if (!strcmp(mem_names[i], "umem"))204 l4_offset = be32_to_cpu(*addrp);205 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;206 }207 208 dev_set_drvdata(dev, rproc);209 210 ret = rproc_add(rproc);211 if (ret) {212 dev_err(dev, "rproc_add failed\n");213 goto err_put_rproc;214 }215 216 return 0;217 218err_put_rproc:219 rproc_free(rproc);220err:221 pm_runtime_put_noidle(dev);222 pm_runtime_disable(dev);223 return ret;224}225 226static void wkup_m3_rproc_remove(struct platform_device *pdev)227{228 struct rproc *rproc = platform_get_drvdata(pdev);229 230 rproc_del(rproc);231 rproc_free(rproc);232 pm_runtime_put_sync(&pdev->dev);233 pm_runtime_disable(&pdev->dev);234}235 236#ifdef CONFIG_PM237static int wkup_m3_rpm_suspend(struct device *dev)238{239 return -EBUSY;240}241 242static int wkup_m3_rpm_resume(struct device *dev)243{244 return 0;245}246#endif247 248static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {249 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)250};251 252static struct platform_driver wkup_m3_rproc_driver = {253 .probe = wkup_m3_rproc_probe,254 .remove_new = wkup_m3_rproc_remove,255 .driver = {256 .name = "wkup_m3_rproc",257 .of_match_table = wkup_m3_rproc_of_match,258 .pm = &wkup_m3_rproc_pm_ops,259 },260};261 262module_platform_driver(wkup_m3_rproc_driver);263 264MODULE_LICENSE("GPL v2");265MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");266MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");267