| // 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.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 void 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); |
| } |
| |
| #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>"); |