blob: edf81819cce179bb338ff615ac09a12b3266e2c8 [file] [log] [blame]
Dave Gerlacha01bc0d2015-05-22 15:45:30 -05001/*
2 * TI AMx3 Wakeup M3 Remote Processor driver
3 *
4 * Copyright (C) 2014-2015 Texas Instruments, Inc.
5 *
6 * Dave Gerlach <d-gerlach@ti.com>
7 * Suman Anna <s-anna@ti.com>
8 *
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.
12 *
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.
17 */
18
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>
28
29#include <linux/platform_data/wkup_m3.h>
30
31#include "remoteproc_internal.h"
32
33#define WKUPM3_MEM_MAX 2
34
35/**
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
41 */
42struct wkup_m3_mem {
43 void __iomem *cpu_addr;
44 phys_addr_t bus_addr;
45 u32 dev_addr;
46 size_t size;
47};
48
49/**
50 * struct wkup_m3_rproc - WkupM3 remote processor state
51 * @rproc: rproc handle
52 * @pdev: pointer to platform device
53 * @mem: WkupM3 memory information
54 */
55struct wkup_m3_rproc {
56 struct rproc *rproc;
57 struct platform_device *pdev;
58 struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
59};
60
61static int wkup_m3_rproc_start(struct rproc *rproc)
62{
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);
67
68 if (pdata->deassert_reset(pdev, pdata->reset_name)) {
69 dev_err(dev, "Unable to reset wkup_m3!\n");
70 return -ENODEV;
71 }
72
73 return 0;
74}
75
76static int wkup_m3_rproc_stop(struct rproc *rproc)
77{
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);
82
83 if (pdata->assert_reset(pdev, pdata->reset_name)) {
84 dev_err(dev, "Unable to assert reset of wkup_m3!\n");
85 return -ENODEV;
86 }
87
88 return 0;
89}
90
91static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
92{
93 struct wkup_m3_rproc *wkupm3 = rproc->priv;
94 void *va = NULL;
95 int i;
96 u32 offset;
97
98 if (len <= 0)
99 return NULL;
100
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);
107 break;
108 }
109 }
110
111 return va;
112}
113
114static 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,
118};
119
120static const struct of_device_id wkup_m3_rproc_of_match[] = {
121 { .compatible = "ti,am3352-wkup-m3", },
122 { .compatible = "ti,am4372-wkup-m3", },
123 {},
124};
125
126static int wkup_m3_rproc_probe(struct platform_device *pdev)
127{
128 struct device *dev = &pdev->dev;
129 struct wkup_m3_platform_data *pdata = dev->platform_data;
130 /* umem always needs to be processed first */
131 const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
132 struct wkup_m3_rproc *wkupm3;
133 const char *fw_name;
134 struct rproc *rproc;
135 struct resource *res;
136 const __be32 *addrp;
137 u32 l4_offset = 0;
138 u64 size;
139 int ret;
140 int i;
141
142 if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
143 pdata->reset_name)) {
144 dev_err(dev, "Platform data missing!\n");
145 return -ENODEV;
146 }
147
148 ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
149 &fw_name);
150 if (ret) {
151 dev_err(dev, "No firmware filename given\n");
152 return -ENODEV;
153 }
154
155 pm_runtime_enable(&pdev->dev);
156 ret = pm_runtime_get_sync(&pdev->dev);
157 if (ret < 0) {
158 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
159 goto err;
160 }
161
162 rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
163 fw_name, sizeof(*wkupm3));
164 if (!rproc) {
165 ret = -ENOMEM;
166 goto err;
167 }
168
169 wkupm3 = rproc->priv;
170 wkupm3->rproc = rproc;
171 wkupm3->pdev = pdev;
172
173 for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
174 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
175 mem_names[i]);
176 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
177 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
178 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
179 i);
180 ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
181 goto err;
182 }
183 wkupm3->mem[i].bus_addr = res->start;
184 wkupm3->mem[i].size = resource_size(res);
185 addrp = of_get_address(dev->of_node, i, &size, NULL);
186 /*
187 * The wkupm3 has umem at address 0 in its view, so the device
188 * addresses for each memory region is computed as a relative
189 * offset of the bus address for umem, and therefore needs to be
190 * processed first.
191 */
192 if (!strcmp(mem_names[i], "umem"))
193 l4_offset = be32_to_cpu(*addrp);
194 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
195 }
196
197 dev_set_drvdata(dev, rproc);
198
199 ret = rproc_add(rproc);
200 if (ret) {
201 dev_err(dev, "rproc_add failed\n");
202 goto err_put_rproc;
203 }
204
205 return 0;
206
207err_put_rproc:
208 rproc_put(rproc);
209err:
210 pm_runtime_put_noidle(dev);
211 pm_runtime_disable(dev);
212 return ret;
213}
214
215static int wkup_m3_rproc_remove(struct platform_device *pdev)
216{
217 struct rproc *rproc = platform_get_drvdata(pdev);
218
219 rproc_del(rproc);
220 rproc_put(rproc);
221 pm_runtime_put_sync(&pdev->dev);
222 pm_runtime_disable(&pdev->dev);
223
224 return 0;
225}
226
227#ifdef CONFIG_PM
228static int wkup_m3_rpm_suspend(struct device *dev)
229{
230 return -EBUSY;
231}
232
233static int wkup_m3_rpm_resume(struct device *dev)
234{
235 return 0;
236}
237#endif
238
239static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
240 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
241};
242
243static struct platform_driver wkup_m3_rproc_driver = {
244 .probe = wkup_m3_rproc_probe,
245 .remove = wkup_m3_rproc_remove,
246 .driver = {
247 .name = "wkup_m3_rproc",
248 .of_match_table = wkup_m3_rproc_of_match,
249 .pm = &wkup_m3_rproc_pm_ops,
250 },
251};
252
253module_platform_driver(wkup_m3_rproc_driver);
254
255MODULE_LICENSE("GPL v2");
256MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
257MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");