2 * TI AMx3 Wakeup M3 Remote Processor driver
4 * Copyright (C) 2014-2015 Texas Instruments, Inc.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * version 2 as published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
19 #include <linux/err.h>
20 #include <linux/interrupt.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/of_device.h>
24 #include <linux/of_address.h>
25 #include <linux/platform_device.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/remoteproc.h>
29 #include <linux/platform_data/wkup_m3.h>
31 #include "remoteproc_internal.h"
33 #define WKUPM3_MEM_MAX 2
36 * struct wkup_m3_mem - WkupM3 internal memory structure
37 * @cpu_addr: MPU virtual address of the memory region
38 * @bus_addr: Bus address used to access the memory region
39 * @dev_addr: Device address from Wakeup M3 view
40 * @size: Size of the memory region
43 void __iomem *cpu_addr;
50 * struct wkup_m3_rproc - WkupM3 remote processor state
51 * @rproc: rproc handle
52 * @pdev: pointer to platform device
53 * @mem: WkupM3 memory information
55 struct wkup_m3_rproc {
57 struct platform_device *pdev;
58 struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
61 static int wkup_m3_rproc_start(struct rproc *rproc)
63 struct wkup_m3_rproc *wkupm3 = rproc->priv;
64 struct platform_device *pdev = wkupm3->pdev;
65 struct device *dev = &pdev->dev;
66 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
68 if (pdata->deassert_reset(pdev, pdata->reset_name)) {
69 dev_err(dev, "Unable to reset wkup_m3!\n");
76 static int wkup_m3_rproc_stop(struct rproc *rproc)
78 struct wkup_m3_rproc *wkupm3 = rproc->priv;
79 struct platform_device *pdev = wkupm3->pdev;
80 struct device *dev = &pdev->dev;
81 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
83 if (pdata->assert_reset(pdev, pdata->reset_name)) {
84 dev_err(dev, "Unable to assert reset of wkup_m3!\n");
91 static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
93 struct wkup_m3_rproc *wkupm3 = rproc->priv;
101 for (i = 0; i < WKUPM3_MEM_MAX; i++) {
102 if (da >= wkupm3->mem[i].dev_addr && da + len <=
103 wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) {
104 offset = da - wkupm3->mem[i].dev_addr;
105 /* __force to make sparse happy with type conversion */
106 va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
114 static const struct rproc_ops wkup_m3_rproc_ops = {
115 .start = wkup_m3_rproc_start,
116 .stop = wkup_m3_rproc_stop,
117 .da_to_va = wkup_m3_rproc_da_to_va,
120 static const struct of_device_id wkup_m3_rproc_of_match[] = {
121 { .compatible = "ti,am3352-wkup-m3", },
122 { .compatible = "ti,am4372-wkup-m3", },
125 MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
127 static int wkup_m3_rproc_probe(struct platform_device *pdev)
129 struct device *dev = &pdev->dev;
130 struct wkup_m3_platform_data *pdata = dev->platform_data;
131 /* umem always needs to be processed first */
132 const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
133 struct wkup_m3_rproc *wkupm3;
136 struct resource *res;
143 if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
144 pdata->reset_name)) {
145 dev_err(dev, "Platform data missing!\n");
149 ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
152 dev_err(dev, "No firmware filename given\n");
156 pm_runtime_enable(&pdev->dev);
157 ret = pm_runtime_get_sync(&pdev->dev);
159 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
163 rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
164 fw_name, sizeof(*wkupm3));
170 rproc->auto_boot = false;
172 wkupm3 = rproc->priv;
173 wkupm3->rproc = rproc;
176 for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
177 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
179 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
180 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
181 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
183 ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
186 wkupm3->mem[i].bus_addr = res->start;
187 wkupm3->mem[i].size = resource_size(res);
188 addrp = of_get_address(dev->of_node, i, &size, NULL);
190 * The wkupm3 has umem at address 0 in its view, so the device
191 * addresses for each memory region is computed as a relative
192 * offset of the bus address for umem, and therefore needs to be
195 if (!strcmp(mem_names[i], "umem"))
196 l4_offset = be32_to_cpu(*addrp);
197 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
200 dev_set_drvdata(dev, rproc);
202 ret = rproc_add(rproc);
204 dev_err(dev, "rproc_add failed\n");
213 pm_runtime_put_noidle(dev);
214 pm_runtime_disable(dev);
218 static int wkup_m3_rproc_remove(struct platform_device *pdev)
220 struct rproc *rproc = platform_get_drvdata(pdev);
224 pm_runtime_put_sync(&pdev->dev);
225 pm_runtime_disable(&pdev->dev);
231 static int wkup_m3_rpm_suspend(struct device *dev)
236 static int wkup_m3_rpm_resume(struct device *dev)
242 static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
243 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
246 static struct platform_driver wkup_m3_rproc_driver = {
247 .probe = wkup_m3_rproc_probe,
248 .remove = wkup_m3_rproc_remove,
250 .name = "wkup_m3_rproc",
251 .of_match_table = wkup_m3_rproc_of_match,
252 .pm = &wkup_m3_rproc_pm_ops,
256 module_platform_driver(wkup_m3_rproc_driver);
258 MODULE_LICENSE("GPL v2");
259 MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");