hrtimer: Report offline hrtimer enqueue
[platform/kernel/linux-rpi.git] / drivers / remoteproc / wkup_m3_rproc.c
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  */
35 struct 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  */
49 struct 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
56 static 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
74 static 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
92 static 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
115 static 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
121 static const struct of_device_id wkup_m3_rproc_of_match[] = {
122         { .compatible = "ti,am3352-wkup-m3", },
123         { .compatible = "ti,am4372-wkup-m3", },
124         {},
125 };
126 MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match);
127
128 static 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
218 err_put_rproc:
219         rproc_free(rproc);
220 err:
221         pm_runtime_put_noidle(dev);
222         pm_runtime_disable(dev);
223         return ret;
224 }
225
226 static 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
237 static int wkup_m3_rpm_suspend(struct device *dev)
238 {
239         return -EBUSY;
240 }
241
242 static int wkup_m3_rpm_resume(struct device *dev)
243 {
244         return 0;
245 }
246 #endif
247
248 static 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
252 static struct platform_driver wkup_m3_rproc_driver = {
253         .probe = wkup_m3_rproc_probe,
254         .remove_new = 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
262 module_platform_driver(wkup_m3_rproc_driver);
263
264 MODULE_LICENSE("GPL v2");
265 MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
266 MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");