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 */
34 struct 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 */
47 struct wkup_m3_rproc {
48 struct rproc *rproc;
49 struct platform_device *pdev;
50 struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
51 };
52
wkup_m3_rproc_start(struct rproc * rproc)53 static 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
wkup_m3_rproc_stop(struct rproc * rproc)68 static 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
wkup_m3_rproc_da_to_va(struct rproc * rproc,u64 da,size_t len)83 static 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
106 static 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
112 static const struct of_device_id wkup_m3_rproc_of_match[] = {
113 { .compatible = "ti,am3352-wkup-m3", },
114 { .compatible = "ti,am4372-wkup-m3", },
115 {},
116 };
117 MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
118
wkup_m3_rproc_probe(struct platform_device * pdev)119 static 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
202 err_put_rproc:
203 rproc_free(rproc);
204 err:
205 pm_runtime_put_noidle(dev);
206 pm_runtime_disable(dev);
207 return ret;
208 }
209
wkup_m3_rproc_remove(struct platform_device * pdev)210 static 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
wkup_m3_rpm_suspend(struct device * dev)223 static int wkup_m3_rpm_suspend(struct device *dev)
224 {
225 return -EBUSY;
226 }
227
wkup_m3_rpm_resume(struct device * dev)228 static int wkup_m3_rpm_resume(struct device *dev)
229 {
230 return 0;
231 }
232 #endif
233
234 static 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
238 static 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
248 module_platform_driver(wkup_m3_rproc_driver);
249
250 MODULE_LICENSE("GPL v2");
251 MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
252 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
253