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267 lines
6.4 KiB
267 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* TI AMx3 Wakeup M3 Remote Processor driver |
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* |
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* Copyright (C) 2014-2015 Texas Instruments, Inc. |
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* |
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* Dave Gerlach <[email protected]> |
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* Suman Anna <[email protected]> |
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*/ |
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#include <linux/err.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/of_address.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/remoteproc.h> |
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#include <linux/reset.h> |
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#include <linux/platform_data/wkup_m3.h> |
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#include "remoteproc_internal.h" |
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#define WKUPM3_MEM_MAX 2 |
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/** |
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* struct wkup_m3_mem - WkupM3 internal memory structure |
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* @cpu_addr: MPU virtual address of the memory region |
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* @bus_addr: Bus address used to access the memory region |
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* @dev_addr: Device address from Wakeup M3 view |
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* @size: Size of the memory region |
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*/ |
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struct wkup_m3_mem { |
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void __iomem *cpu_addr; |
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phys_addr_t bus_addr; |
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u32 dev_addr; |
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size_t size; |
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}; |
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/** |
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* struct wkup_m3_rproc - WkupM3 remote processor state |
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* @rproc: rproc handle |
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* @pdev: pointer to platform device |
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* @mem: WkupM3 memory information |
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* @rsts: reset control |
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*/ |
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struct wkup_m3_rproc { |
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struct rproc *rproc; |
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struct platform_device *pdev; |
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struct wkup_m3_mem mem[WKUPM3_MEM_MAX]; |
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struct reset_control *rsts; |
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}; |
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static int wkup_m3_rproc_start(struct rproc *rproc) |
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{ |
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struct wkup_m3_rproc *wkupm3 = rproc->priv; |
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struct platform_device *pdev = wkupm3->pdev; |
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struct device *dev = &pdev->dev; |
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struct wkup_m3_platform_data *pdata = dev_get_platdata(dev); |
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int error = 0; |
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error = reset_control_deassert(wkupm3->rsts); |
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if (!wkupm3->rsts && pdata->deassert_reset(pdev, pdata->reset_name)) { |
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dev_err(dev, "Unable to reset wkup_m3!\n"); |
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error = -ENODEV; |
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} |
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return error; |
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} |
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static int wkup_m3_rproc_stop(struct rproc *rproc) |
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{ |
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struct wkup_m3_rproc *wkupm3 = rproc->priv; |
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struct platform_device *pdev = wkupm3->pdev; |
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struct device *dev = &pdev->dev; |
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struct wkup_m3_platform_data *pdata = dev_get_platdata(dev); |
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int error = 0; |
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error = reset_control_assert(wkupm3->rsts); |
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if (!wkupm3->rsts && pdata->assert_reset(pdev, pdata->reset_name)) { |
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dev_err(dev, "Unable to assert reset of wkup_m3!\n"); |
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error = -ENODEV; |
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} |
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return error; |
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} |
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static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len) |
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{ |
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struct wkup_m3_rproc *wkupm3 = rproc->priv; |
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void *va = NULL; |
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int i; |
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u32 offset; |
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if (len == 0) |
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return NULL; |
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for (i = 0; i < WKUPM3_MEM_MAX; i++) { |
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if (da >= wkupm3->mem[i].dev_addr && da + len <= |
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wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) { |
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offset = da - wkupm3->mem[i].dev_addr; |
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/* __force to make sparse happy with type conversion */ |
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va = (__force void *)(wkupm3->mem[i].cpu_addr + offset); |
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break; |
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} |
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} |
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return va; |
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} |
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static const struct rproc_ops wkup_m3_rproc_ops = { |
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.start = wkup_m3_rproc_start, |
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.stop = wkup_m3_rproc_stop, |
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.da_to_va = wkup_m3_rproc_da_to_va, |
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}; |
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static const struct of_device_id wkup_m3_rproc_of_match[] = { |
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{ .compatible = "ti,am3352-wkup-m3", }, |
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{ .compatible = "ti,am4372-wkup-m3", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match); |
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static int wkup_m3_rproc_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct wkup_m3_platform_data *pdata = dev->platform_data; |
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/* umem always needs to be processed first */ |
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const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" }; |
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struct wkup_m3_rproc *wkupm3; |
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const char *fw_name; |
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struct rproc *rproc; |
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struct resource *res; |
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const __be32 *addrp; |
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u32 l4_offset = 0; |
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u64 size; |
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int ret; |
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int i; |
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ret = of_property_read_string(dev->of_node, "ti,pm-firmware", |
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&fw_name); |
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if (ret) { |
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dev_err(dev, "No firmware filename given\n"); |
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return -ENODEV; |
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} |
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pm_runtime_enable(&pdev->dev); |
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ret = pm_runtime_get_sync(&pdev->dev); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n"); |
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goto err; |
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} |
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rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops, |
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fw_name, sizeof(*wkupm3)); |
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if (!rproc) { |
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ret = -ENOMEM; |
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goto err; |
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} |
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rproc->auto_boot = false; |
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wkupm3 = rproc->priv; |
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wkupm3->rproc = rproc; |
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wkupm3->pdev = pdev; |
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wkupm3->rsts = devm_reset_control_get_optional_shared(dev, "rstctrl"); |
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if (IS_ERR(wkupm3->rsts)) |
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return PTR_ERR(wkupm3->rsts); |
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if (!wkupm3->rsts) { |
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if (!(pdata && pdata->deassert_reset && pdata->assert_reset && |
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pdata->reset_name)) { |
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dev_err(dev, "Platform data missing!\n"); |
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ret = -ENODEV; |
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goto err_put_rproc; |
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} |
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} |
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for (i = 0; i < ARRAY_SIZE(mem_names); i++) { |
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, |
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mem_names[i]); |
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wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res); |
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if (IS_ERR(wkupm3->mem[i].cpu_addr)) { |
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dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n", |
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i); |
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ret = PTR_ERR(wkupm3->mem[i].cpu_addr); |
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goto err_put_rproc; |
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} |
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wkupm3->mem[i].bus_addr = res->start; |
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wkupm3->mem[i].size = resource_size(res); |
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addrp = of_get_address(dev->of_node, i, &size, NULL); |
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/* |
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* The wkupm3 has umem at address 0 in its view, so the device |
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* addresses for each memory region is computed as a relative |
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* offset of the bus address for umem, and therefore needs to be |
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* processed first. |
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*/ |
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if (!strcmp(mem_names[i], "umem")) |
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l4_offset = be32_to_cpu(*addrp); |
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wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset; |
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} |
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dev_set_drvdata(dev, rproc); |
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ret = rproc_add(rproc); |
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if (ret) { |
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dev_err(dev, "rproc_add failed\n"); |
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goto err_put_rproc; |
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} |
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return 0; |
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err_put_rproc: |
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rproc_free(rproc); |
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err: |
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pm_runtime_put_noidle(dev); |
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pm_runtime_disable(dev); |
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return ret; |
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} |
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static int wkup_m3_rproc_remove(struct platform_device *pdev) |
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{ |
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struct rproc *rproc = platform_get_drvdata(pdev); |
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rproc_del(rproc); |
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rproc_free(rproc); |
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pm_runtime_put_sync(&pdev->dev); |
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pm_runtime_disable(&pdev->dev); |
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return 0; |
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} |
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#ifdef CONFIG_PM |
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static int wkup_m3_rpm_suspend(struct device *dev) |
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{ |
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return -EBUSY; |
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} |
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static int wkup_m3_rpm_resume(struct device *dev) |
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{ |
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return 0; |
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} |
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#endif |
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static const struct dev_pm_ops wkup_m3_rproc_pm_ops = { |
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SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL) |
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}; |
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static struct platform_driver wkup_m3_rproc_driver = { |
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.probe = wkup_m3_rproc_probe, |
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.remove = wkup_m3_rproc_remove, |
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.driver = { |
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.name = "wkup_m3_rproc", |
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.of_match_table = wkup_m3_rproc_of_match, |
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.pm = &wkup_m3_rproc_pm_ops, |
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}, |
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}; |
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module_platform_driver(wkup_m3_rproc_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver"); |
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MODULE_AUTHOR("Dave Gerlach <[email protected]>");
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