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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> | |
3440d8da | 15 | #include <linux/of.h> |
a01bc0d5 DG |
16 | #include <linux/of_address.h> |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/pm_runtime.h> | |
19 | #include <linux/remoteproc.h> | |
57df7e37 | 20 | #include <linux/reset.h> |
a01bc0d5 DG |
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 | |
57df7e37 | 47 | * @rsts: reset control |
a01bc0d5 DG |
48 | */ |
49 | struct wkup_m3_rproc { | |
50 | struct rproc *rproc; | |
51 | struct platform_device *pdev; | |
52 | struct wkup_m3_mem mem[WKUPM3_MEM_MAX]; | |
57df7e37 | 53 | struct reset_control *rsts; |
a01bc0d5 DG |
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); | |
57df7e37 | 62 | int error = 0; |
a01bc0d5 | 63 | |
57df7e37 TL |
64 | error = reset_control_deassert(wkupm3->rsts); |
65 | ||
66 | if (!wkupm3->rsts && pdata->deassert_reset(pdev, pdata->reset_name)) { | |
a01bc0d5 | 67 | dev_err(dev, "Unable to reset wkup_m3!\n"); |
57df7e37 | 68 | error = -ENODEV; |
a01bc0d5 DG |
69 | } |
70 | ||
57df7e37 | 71 | return error; |
a01bc0d5 DG |
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); | |
57df7e37 | 80 | int error = 0; |
a01bc0d5 | 81 | |
57df7e37 TL |
82 | error = reset_control_assert(wkupm3->rsts); |
83 | ||
84 | if (!wkupm3->rsts && pdata->assert_reset(pdev, pdata->reset_name)) { | |
a01bc0d5 | 85 | dev_err(dev, "Unable to assert reset of wkup_m3!\n"); |
57df7e37 | 86 | error = -ENODEV; |
a01bc0d5 DG |
87 | } |
88 | ||
57df7e37 | 89 | return error; |
a01bc0d5 DG |
90 | } |
91 | ||
40df0a91 | 92 | static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem) |
a01bc0d5 DG |
93 | { |
94 | struct wkup_m3_rproc *wkupm3 = rproc->priv; | |
95 | void *va = NULL; | |
96 | int i; | |
97 | u32 offset; | |
98 | ||
9ce3bf22 | 99 | if (len == 0) |
a01bc0d5 DG |
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 | ||
c008fad2 | 115 | static const struct rproc_ops wkup_m3_rproc_ops = { |
a01bc0d5 DG |
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 | }; | |
99c429cb | 126 | MODULE_DEVICE_TABLE(of, wkup_m3_rproc_of_match); |
a01bc0d5 DG |
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 | ||
a01bc0d5 DG |
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 | ||
ddf71187 | 165 | rproc->auto_boot = false; |
19e7bf83 | 166 | rproc->sysfs_read_only = true; |
ddf71187 | 167 | |
a01bc0d5 DG |
168 | wkupm3 = rproc->priv; |
169 | wkupm3->rproc = rproc; | |
170 | wkupm3->pdev = pdev; | |
171 | ||
57df7e37 TL |
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 | ||
a01bc0d5 DG |
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); | |
57df7e37 | 192 | goto err_put_rproc; |
a01bc0d5 DG |
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: | |
433c0e04 | 219 | rproc_free(rproc); |
a01bc0d5 DG |
220 | err: |
221 | pm_runtime_put_noidle(dev); | |
222 | pm_runtime_disable(dev); | |
223 | return ret; | |
224 | } | |
225 | ||
52ca331b | 226 | static void wkup_m3_rproc_remove(struct platform_device *pdev) |
a01bc0d5 DG |
227 | { |
228 | struct rproc *rproc = platform_get_drvdata(pdev); | |
229 | ||
230 | rproc_del(rproc); | |
433c0e04 | 231 | rproc_free(rproc); |
a01bc0d5 DG |
232 | pm_runtime_put_sync(&pdev->dev); |
233 | pm_runtime_disable(&pdev->dev); | |
a01bc0d5 DG |
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, | |
52ca331b | 254 | .remove_new = wkup_m3_rproc_remove, |
a01bc0d5 DG |
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>"); |