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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a01bc0d5 DG |
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> | |
a01bc0d5 DG |
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 | ||
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 | ||
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 | ||
83 | static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int 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 | ||
c008fad2 | 106 | static const struct rproc_ops wkup_m3_rproc_ops = { |
a01bc0d5 DG |
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 | }; | |
99c429cb | 117 | MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match); |
a01bc0d5 DG |
118 | |
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 | ||
ddf71187 BA |
162 | rproc->auto_boot = false; |
163 | ||
a01bc0d5 DG |
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: | |
433c0e04 | 203 | rproc_free(rproc); |
a01bc0d5 DG |
204 | err: |
205 | pm_runtime_put_noidle(dev); | |
206 | pm_runtime_disable(dev); | |
207 | return ret; | |
208 | } | |
209 | ||
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); | |
433c0e04 | 215 | rproc_free(rproc); |
a01bc0d5 DG |
216 | pm_runtime_put_sync(&pdev->dev); |
217 | pm_runtime_disable(&pdev->dev); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | #ifdef CONFIG_PM | |
223 | static int wkup_m3_rpm_suspend(struct device *dev) | |
224 | { | |
225 | return -EBUSY; | |
226 | } | |
227 | ||
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>"); |