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(rstc: 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(rstc: 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(np: dev->of_node, propname: "ti,pm-firmware" , |
145 | out_string: &fw_name); |
146 | if (ret) { |
147 | dev_err(dev, "No firmware filename given\n" ); |
148 | return -ENODEV; |
149 | } |
150 | |
151 | pm_runtime_enable(dev: &pdev->dev); |
152 | ret = pm_runtime_get_sync(dev: &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, name: "wkup_m3" , ops: &wkup_m3_rproc_ops, |
159 | firmware: fw_name, len: 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, id: "rstctrl" ); |
173 | if (IS_ERR(ptr: wkupm3->rsts)) |
174 | return PTR_ERR(ptr: 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(ptr: wkupm3->mem[i].cpu_addr)) { |
189 | dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n" , |
190 | i); |
191 | ret = PTR_ERR(ptr: 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: dev->of_node, index: i, size: &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, data: 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(dev: &pdev->dev); |
233 | pm_runtime_disable(dev: &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>" ); |
267 | |