// SPDX-License-Identifier: GPL-2.0-only /* * TI AMx3 Wakeup M3 Remote Processor driver * * Copyright (C) 2014-2015 Texas Instruments, Inc. * * Dave Gerlach * Suman Anna */ #include #include #include #include #include #include #include #include #include #include #include #include "remoteproc_internal.h" #define WKUPM3_MEM_MAX 2 /** * struct wkup_m3_mem - WkupM3 internal memory structure * @cpu_addr: MPU virtual address of the memory region * @bus_addr: Bus address used to access the memory region * @dev_addr: Device address from Wakeup M3 view * @size: Size of the memory region */ struct wkup_m3_mem { void __iomem *cpu_addr; phys_addr_t bus_addr; u32 dev_addr; size_t size; }; /** * struct wkup_m3_rproc - WkupM3 remote processor state * @rproc: rproc handle * @pdev: pointer to platform device * @mem: WkupM3 memory information * @rsts: reset control */ struct wkup_m3_rproc { struct rproc *rproc; struct platform_device *pdev; struct wkup_m3_mem mem[WKUPM3_MEM_MAX]; struct reset_control *rsts; }; static int wkup_m3_rproc_start(struct rproc *rproc) { struct wkup_m3_rproc *wkupm3 = rproc->priv; struct platform_device *pdev = wkupm3->pdev; struct device *dev = &pdev->dev; struct wkup_m3_platform_data *pdata = dev_get_platdata(dev); int error = 0; error = reset_control_deassert(wkupm3->rsts); if (!wkupm3->rsts && pdata->deassert_reset(pdev, pdata->reset_name)) { dev_err(dev, "Unable to reset wkup_m3!\n"); error = -ENODEV; } return error; } static int wkup_m3_rproc_stop(struct rproc *rproc) { struct wkup_m3_rproc *wkupm3 = rproc->priv; struct platform_device *pdev = wkupm3->pdev; struct device *dev = &pdev->dev; struct wkup_m3_platform_data *pdata = dev_get_platdata(dev); int error = 0; error = reset_control_assert(wkupm3->rsts); if (!wkupm3->rsts && pdata->assert_reset(pdev, pdata->reset_name)) { dev_err(dev, "Unable to assert reset of wkup_m3!\n"); error = -ENODEV; } return error; } static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem) { struct wkup_m3_rproc *wkupm3 = rproc->priv; void *va = NULL; int i; u32 offset; if (len == 0) return NULL; for (i = 0; i < WKUPM3_MEM_MAX; i++) { if (da >= wkupm3->mem[i].dev_addr && da + len <= wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) { offset = da - wkupm3->mem[i].dev_addr; /* __force to make sparse happy with type conversion */ va = (__force void *)(wkupm3->mem[i].cpu_addr + offset); break; } } return va; } static const struct rproc_ops wkup_m3_rproc_ops = { .start = wkup_m3_rproc_start, .stop = wkup_m3_rproc_stop, .da_to_va = wkup_m3_rproc_da_to_va, }; static const struct of_device_id wkup_m3_rproc_of_match[] = { { .compatible = "ti,am3352-wkup-m3", }, { .compatible = "ti,am4372-wkup-m3", }, {}, }; MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match); static void wkup_m3_rproc_pm_runtime_put(void *data) { struct device *dev = data; pm_runtime_put_sync(dev); } static int wkup_m3_rproc_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct wkup_m3_platform_data *pdata = dev->platform_data; /* umem always needs to be processed first */ const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" }; struct wkup_m3_rproc *wkupm3; const char *fw_name; struct rproc *rproc; struct resource *res; const __be32 *addrp; u32 l4_offset = 0; u64 size; int ret; int i; ret = of_property_read_string(dev->of_node, "ti,pm-firmware", &fw_name); if (ret) { dev_err(dev, "No firmware filename given\n"); return -ENODEV; } ret = devm_pm_runtime_enable(dev); if (ret < 0) return dev_err_probe(dev, ret, "Failed to enable runtime PM\n"); ret = pm_runtime_get_sync(&pdev->dev); if (ret < 0) return dev_err_probe(dev, ret, "pm_runtime_get_sync() failed\n"); ret = devm_add_action_or_reset(dev, wkup_m3_rproc_pm_runtime_put, dev); if (ret) return dev_err_probe(dev, ret, "failed to add disable pm devm action\n"); rproc = devm_rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops, fw_name, sizeof(*wkupm3)); if (!rproc) return -ENOMEM; rproc->auto_boot = false; rproc->sysfs_read_only = true; wkupm3 = rproc->priv; wkupm3->rproc = rproc; wkupm3->pdev = pdev; wkupm3->rsts = devm_reset_control_get_optional_shared(dev, "rstctrl"); if (IS_ERR(wkupm3->rsts)) return PTR_ERR(wkupm3->rsts); if (!wkupm3->rsts) { if (!(pdata && pdata->deassert_reset && pdata->assert_reset && pdata->reset_name)) { return dev_err_probe(dev, -ENODEV, "Platform data missing!\n"); } } for (i = 0; i < ARRAY_SIZE(mem_names); i++) { res = platform_get_resource_byname(pdev, IORESOURCE_MEM, mem_names[i]); wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res); if (IS_ERR(wkupm3->mem[i].cpu_addr)) return dev_err_probe(dev, PTR_ERR(wkupm3->mem[i].cpu_addr), "devm_ioremap_resource failed for resource %d\n", i); wkupm3->mem[i].bus_addr = res->start; wkupm3->mem[i].size = resource_size(res); addrp = of_get_address(dev->of_node, i, &size, NULL); /* * The wkupm3 has umem at address 0 in its view, so the device * addresses for each memory region is computed as a relative * offset of the bus address for umem, and therefore needs to be * processed first. */ if (!strcmp(mem_names[i], "umem")) l4_offset = be32_to_cpu(*addrp); wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset; } dev_set_drvdata(dev, rproc); ret = devm_rproc_add(dev, rproc); if (ret) return dev_err_probe(dev, ret, "rproc_add failed\n"); return 0; } #ifdef CONFIG_PM static int wkup_m3_rpm_suspend(struct device *dev) { return -EBUSY; } static int wkup_m3_rpm_resume(struct device *dev) { return 0; } #endif static const struct dev_pm_ops wkup_m3_rproc_pm_ops = { SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL) }; static struct platform_driver wkup_m3_rproc_driver = { .probe = wkup_m3_rproc_probe, .driver = { .name = "wkup_m3_rproc", .of_match_table = wkup_m3_rproc_of_match, .pm = &wkup_m3_rproc_pm_ops, }, }; module_platform_driver(wkup_m3_rproc_driver); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver"); MODULE_AUTHOR("Dave Gerlach ");