261 lines
6.4 KiB
C
261 lines
6.4 KiB
C
/*
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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 <d-gerlach@ti.com>
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* Suman Anna <s-anna@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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/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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*/
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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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};
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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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if (pdata->deassert_reset(pdev, pdata->reset_name)) {
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dev_err(dev, "Unable to reset wkup_m3!\n");
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return -ENODEV;
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}
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return 0;
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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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if (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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return -ENODEV;
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}
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return 0;
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}
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static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int 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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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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return -ENODEV;
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}
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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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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;
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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 <d-gerlach@ti.com>");
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