// SPDX-License-Identifier: GPL-2.0-only /* * TI AMx3 Wakeup M3 Remote Processor driver * * Copyright (C) 2014-2015 Texas Instruments, Inc. * * Dave Gerlach <d-gerlach@ti.com> * Suman Anna <s-anna@ti.com> */ #include <linux/err.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of_device.h> #include <linux/of_address.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/remoteproc.h> #include <linux/reset.h> #include <linux/platform_data/wkup_m3.h> #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 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; } pm_runtime_enable(&pdev->dev); ret = pm_runtime_get_sync(&pdev->dev); if (ret < 0) { dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n"); goto err; } rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops, fw_name, sizeof(*wkupm3)); if (!rproc) { ret = -ENOMEM; goto err; } 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)) { dev_err(dev, "Platform data missing!\n"); ret = -ENODEV; goto err_put_rproc; } } 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)) { dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n", i); ret = PTR_ERR(wkupm3->mem[i].cpu_addr); goto err_put_rproc; } 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 = rproc_add(rproc); if (ret) { dev_err(dev, "rproc_add failed\n"); goto err_put_rproc; } return 0; err_put_rproc: rproc_free(rproc); err: pm_runtime_put_noidle(dev); pm_runtime_disable(dev); return ret; } static int wkup_m3_rproc_remove(struct platform_device *pdev) { struct rproc *rproc = platform_get_drvdata(pdev); rproc_del(rproc); rproc_free(rproc); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); 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, .remove = wkup_m3_rproc_remove, .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 <d-gerlach@ti.com>");