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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TI AMx3 Wakeup M3 Remote Processor driver
4 *
5 * Copyright (C) 2014-2015 Texas Instruments, Inc.
6 *
7 * Dave Gerlach <d-gerlach@ti.com>
8 * Suman Anna <s-anna@ti.com>
9 */
10
11#include <linux/err.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17#include <linux/platform_device.h>
18#include <linux/pm_runtime.h>
19#include <linux/remoteproc.h>
20#include <linux/reset.h>
21
22#include <linux/platform_data/wkup_m3.h>
23
24#include "remoteproc_internal.h"
25
26#define WKUPM3_MEM_MAX 2
27
28/**
29 * struct wkup_m3_mem - WkupM3 internal memory structure
30 * @cpu_addr: MPU virtual address of the memory region
31 * @bus_addr: Bus address used to access the memory region
32 * @dev_addr: Device address from Wakeup M3 view
33 * @size: Size of the memory region
34 */
35struct wkup_m3_mem {
36 void __iomem *cpu_addr;
37 phys_addr_t bus_addr;
38 u32 dev_addr;
39 size_t size;
40};
41
42/**
43 * struct wkup_m3_rproc - WkupM3 remote processor state
44 * @rproc: rproc handle
45 * @pdev: pointer to platform device
46 * @mem: WkupM3 memory information
47 * @rsts: reset control
48 */
49struct wkup_m3_rproc {
50 struct rproc *rproc;
51 struct platform_device *pdev;
52 struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
53 struct reset_control *rsts;
54};
55
56static int wkup_m3_rproc_start(struct rproc *rproc)
57{
58 struct wkup_m3_rproc *wkupm3 = rproc->priv;
59 struct platform_device *pdev = wkupm3->pdev;
60 struct device *dev = &pdev->dev;
61 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
62 int error = 0;
63
64 error = reset_control_deassert(wkupm3->rsts);
65
66 if (!wkupm3->rsts && pdata->deassert_reset(pdev, pdata->reset_name)) {
67 dev_err(dev, "Unable to reset wkup_m3!\n");
68 error = -ENODEV;
69 }
70
71 return error;
72}
73
74static int wkup_m3_rproc_stop(struct rproc *rproc)
75{
76 struct wkup_m3_rproc *wkupm3 = rproc->priv;
77 struct platform_device *pdev = wkupm3->pdev;
78 struct device *dev = &pdev->dev;
79 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
80 int error = 0;
81
82 error = reset_control_assert(wkupm3->rsts);
83
84 if (!wkupm3->rsts && pdata->assert_reset(pdev, pdata->reset_name)) {
85 dev_err(dev, "Unable to assert reset of wkup_m3!\n");
86 error = -ENODEV;
87 }
88
89 return error;
90}
91
92static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
93{
94 struct wkup_m3_rproc *wkupm3 = rproc->priv;
95 void *va = NULL;
96 int i;
97 u32 offset;
98
99 if (len == 0)
100 return NULL;
101
102 for (i = 0; i < WKUPM3_MEM_MAX; i++) {
103 if (da >= wkupm3->mem[i].dev_addr && da + len <=
104 wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) {
105 offset = da - wkupm3->mem[i].dev_addr;
106 /* __force to make sparse happy with type conversion */
107 va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
108 break;
109 }
110 }
111
112 return va;
113}
114
115static const struct rproc_ops wkup_m3_rproc_ops = {
116 .start = wkup_m3_rproc_start,
117 .stop = wkup_m3_rproc_stop,
118 .da_to_va = wkup_m3_rproc_da_to_va,
119};
120
121static const struct of_device_id wkup_m3_rproc_of_match[] = {
122 { .compatible = "ti,am3352-wkup-m3", },
123 { .compatible = "ti,am4372-wkup-m3", },
124 {},
125};
126MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
127
128static int wkup_m3_rproc_probe(struct platform_device *pdev)
129{
130 struct device *dev = &pdev->dev;
131 struct wkup_m3_platform_data *pdata = dev->platform_data;
132 /* umem always needs to be processed first */
133 const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
134 struct wkup_m3_rproc *wkupm3;
135 const char *fw_name;
136 struct rproc *rproc;
137 struct resource *res;
138 const __be32 *addrp;
139 u32 l4_offset = 0;
140 u64 size;
141 int ret;
142 int i;
143
144 ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
145 &fw_name);
146 if (ret) {
147 dev_err(dev, "No firmware filename given\n");
148 return -ENODEV;
149 }
150
151 pm_runtime_enable(&pdev->dev);
152 ret = pm_runtime_get_sync(&pdev->dev);
153 if (ret < 0) {
154 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
155 goto err;
156 }
157
158 rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
159 fw_name, sizeof(*wkupm3));
160 if (!rproc) {
161 ret = -ENOMEM;
162 goto err;
163 }
164
165 rproc->auto_boot = false;
166 rproc->sysfs_read_only = true;
167
168 wkupm3 = rproc->priv;
169 wkupm3->rproc = rproc;
170 wkupm3->pdev = pdev;
171
172 wkupm3->rsts = devm_reset_control_get_optional_shared(dev, "rstctrl");
173 if (IS_ERR(wkupm3->rsts))
174 return PTR_ERR(wkupm3->rsts);
175 if (!wkupm3->rsts) {
176 if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
177 pdata->reset_name)) {
178 dev_err(dev, "Platform data missing!\n");
179 ret = -ENODEV;
180 goto err_put_rproc;
181 }
182 }
183
184 for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
185 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
186 mem_names[i]);
187 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
188 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
189 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
190 i);
191 ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
192 goto err_put_rproc;
193 }
194 wkupm3->mem[i].bus_addr = res->start;
195 wkupm3->mem[i].size = resource_size(res);
196 addrp = of_get_address(dev->of_node, i, &size, NULL);
197 /*
198 * The wkupm3 has umem at address 0 in its view, so the device
199 * addresses for each memory region is computed as a relative
200 * offset of the bus address for umem, and therefore needs to be
201 * processed first.
202 */
203 if (!strcmp(mem_names[i], "umem"))
204 l4_offset = be32_to_cpu(*addrp);
205 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
206 }
207
208 dev_set_drvdata(dev, rproc);
209
210 ret = rproc_add(rproc);
211 if (ret) {
212 dev_err(dev, "rproc_add failed\n");
213 goto err_put_rproc;
214 }
215
216 return 0;
217
218err_put_rproc:
219 rproc_free(rproc);
220err:
221 pm_runtime_put_noidle(dev);
222 pm_runtime_disable(dev);
223 return ret;
224}
225
226static void wkup_m3_rproc_remove(struct platform_device *pdev)
227{
228 struct rproc *rproc = platform_get_drvdata(pdev);
229
230 rproc_del(rproc);
231 rproc_free(rproc);
232 pm_runtime_put_sync(&pdev->dev);
233 pm_runtime_disable(&pdev->dev);
234}
235
236#ifdef CONFIG_PM
237static int wkup_m3_rpm_suspend(struct device *dev)
238{
239 return -EBUSY;
240}
241
242static int wkup_m3_rpm_resume(struct device *dev)
243{
244 return 0;
245}
246#endif
247
248static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
249 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
250};
251
252static struct platform_driver wkup_m3_rproc_driver = {
253 .probe = wkup_m3_rproc_probe,
254 .remove = wkup_m3_rproc_remove,
255 .driver = {
256 .name = "wkup_m3_rproc",
257 .of_match_table = wkup_m3_rproc_of_match,
258 .pm = &wkup_m3_rproc_pm_ops,
259 },
260};
261
262module_platform_driver(wkup_m3_rproc_driver);
263
264MODULE_LICENSE("GPL v2");
265MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
266MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * TI AMx3 Wakeup M3 Remote Processor driver
4 *
5 * Copyright (C) 2014-2015 Texas Instruments, Inc.
6 *
7 * Dave Gerlach <d-gerlach@ti.com>
8 * Suman Anna <s-anna@ti.com>
9 */
10
11#include <linux/err.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/of_device.h>
16#include <linux/of_address.h>
17#include <linux/platform_device.h>
18#include <linux/pm_runtime.h>
19#include <linux/remoteproc.h>
20
21#include <linux/platform_data/wkup_m3.h>
22
23#include "remoteproc_internal.h"
24
25#define WKUPM3_MEM_MAX 2
26
27/**
28 * struct wkup_m3_mem - WkupM3 internal memory structure
29 * @cpu_addr: MPU virtual address of the memory region
30 * @bus_addr: Bus address used to access the memory region
31 * @dev_addr: Device address from Wakeup M3 view
32 * @size: Size of the memory region
33 */
34struct wkup_m3_mem {
35 void __iomem *cpu_addr;
36 phys_addr_t bus_addr;
37 u32 dev_addr;
38 size_t size;
39};
40
41/**
42 * struct wkup_m3_rproc - WkupM3 remote processor state
43 * @rproc: rproc handle
44 * @pdev: pointer to platform device
45 * @mem: WkupM3 memory information
46 */
47struct wkup_m3_rproc {
48 struct rproc *rproc;
49 struct platform_device *pdev;
50 struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
51};
52
53static int wkup_m3_rproc_start(struct rproc *rproc)
54{
55 struct wkup_m3_rproc *wkupm3 = rproc->priv;
56 struct platform_device *pdev = wkupm3->pdev;
57 struct device *dev = &pdev->dev;
58 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
59
60 if (pdata->deassert_reset(pdev, pdata->reset_name)) {
61 dev_err(dev, "Unable to reset wkup_m3!\n");
62 return -ENODEV;
63 }
64
65 return 0;
66}
67
68static int wkup_m3_rproc_stop(struct rproc *rproc)
69{
70 struct wkup_m3_rproc *wkupm3 = rproc->priv;
71 struct platform_device *pdev = wkupm3->pdev;
72 struct device *dev = &pdev->dev;
73 struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
74
75 if (pdata->assert_reset(pdev, pdata->reset_name)) {
76 dev_err(dev, "Unable to assert reset of wkup_m3!\n");
77 return -ENODEV;
78 }
79
80 return 0;
81}
82
83static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len)
84{
85 struct wkup_m3_rproc *wkupm3 = rproc->priv;
86 void *va = NULL;
87 int i;
88 u32 offset;
89
90 if (len == 0)
91 return NULL;
92
93 for (i = 0; i < WKUPM3_MEM_MAX; i++) {
94 if (da >= wkupm3->mem[i].dev_addr && da + len <=
95 wkupm3->mem[i].dev_addr + wkupm3->mem[i].size) {
96 offset = da - wkupm3->mem[i].dev_addr;
97 /* __force to make sparse happy with type conversion */
98 va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
99 break;
100 }
101 }
102
103 return va;
104}
105
106static const struct rproc_ops wkup_m3_rproc_ops = {
107 .start = wkup_m3_rproc_start,
108 .stop = wkup_m3_rproc_stop,
109 .da_to_va = wkup_m3_rproc_da_to_va,
110};
111
112static const struct of_device_id wkup_m3_rproc_of_match[] = {
113 { .compatible = "ti,am3352-wkup-m3", },
114 { .compatible = "ti,am4372-wkup-m3", },
115 {},
116};
117MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
118
119static int wkup_m3_rproc_probe(struct platform_device *pdev)
120{
121 struct device *dev = &pdev->dev;
122 struct wkup_m3_platform_data *pdata = dev->platform_data;
123 /* umem always needs to be processed first */
124 const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
125 struct wkup_m3_rproc *wkupm3;
126 const char *fw_name;
127 struct rproc *rproc;
128 struct resource *res;
129 const __be32 *addrp;
130 u32 l4_offset = 0;
131 u64 size;
132 int ret;
133 int i;
134
135 if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
136 pdata->reset_name)) {
137 dev_err(dev, "Platform data missing!\n");
138 return -ENODEV;
139 }
140
141 ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
142 &fw_name);
143 if (ret) {
144 dev_err(dev, "No firmware filename given\n");
145 return -ENODEV;
146 }
147
148 pm_runtime_enable(&pdev->dev);
149 ret = pm_runtime_get_sync(&pdev->dev);
150 if (ret < 0) {
151 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
152 goto err;
153 }
154
155 rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
156 fw_name, sizeof(*wkupm3));
157 if (!rproc) {
158 ret = -ENOMEM;
159 goto err;
160 }
161
162 rproc->auto_boot = false;
163
164 wkupm3 = rproc->priv;
165 wkupm3->rproc = rproc;
166 wkupm3->pdev = pdev;
167
168 for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
169 res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
170 mem_names[i]);
171 wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
172 if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
173 dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
174 i);
175 ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
176 goto err;
177 }
178 wkupm3->mem[i].bus_addr = res->start;
179 wkupm3->mem[i].size = resource_size(res);
180 addrp = of_get_address(dev->of_node, i, &size, NULL);
181 /*
182 * The wkupm3 has umem at address 0 in its view, so the device
183 * addresses for each memory region is computed as a relative
184 * offset of the bus address for umem, and therefore needs to be
185 * processed first.
186 */
187 if (!strcmp(mem_names[i], "umem"))
188 l4_offset = be32_to_cpu(*addrp);
189 wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
190 }
191
192 dev_set_drvdata(dev, rproc);
193
194 ret = rproc_add(rproc);
195 if (ret) {
196 dev_err(dev, "rproc_add failed\n");
197 goto err_put_rproc;
198 }
199
200 return 0;
201
202err_put_rproc:
203 rproc_free(rproc);
204err:
205 pm_runtime_put_noidle(dev);
206 pm_runtime_disable(dev);
207 return ret;
208}
209
210static int wkup_m3_rproc_remove(struct platform_device *pdev)
211{
212 struct rproc *rproc = platform_get_drvdata(pdev);
213
214 rproc_del(rproc);
215 rproc_free(rproc);
216 pm_runtime_put_sync(&pdev->dev);
217 pm_runtime_disable(&pdev->dev);
218
219 return 0;
220}
221
222#ifdef CONFIG_PM
223static int wkup_m3_rpm_suspend(struct device *dev)
224{
225 return -EBUSY;
226}
227
228static int wkup_m3_rpm_resume(struct device *dev)
229{
230 return 0;
231}
232#endif
233
234static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
235 SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
236};
237
238static struct platform_driver wkup_m3_rproc_driver = {
239 .probe = wkup_m3_rproc_probe,
240 .remove = wkup_m3_rproc_remove,
241 .driver = {
242 .name = "wkup_m3_rproc",
243 .of_match_table = wkup_m3_rproc_of_match,
244 .pm = &wkup_m3_rproc_pm_ops,
245 },
246};
247
248module_platform_driver(wkup_m3_rproc_driver);
249
250MODULE_LICENSE("GPL v2");
251MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
252MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");