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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3b9334ac | 2 | /* |
3b9334ac PM |
3 | * |
4 | * Copyright (C) 2014 ARM Limited | |
5 | */ | |
6 | ||
7 | #include <linux/err.h> | |
8 | #include <linux/init.h> | |
d06cfe3f | 9 | #include <linux/io.h> |
70e4758a | 10 | #include <linux/module.h> |
3b9334ac | 11 | #include <linux/of.h> |
d06cfe3f | 12 | #include <linux/platform_device.h> |
3b9334ac | 13 | #include <linux/of_device.h> |
d06cfe3f RH |
14 | #include <linux/sched/signal.h> |
15 | #include <linux/slab.h> | |
3b9334ac PM |
16 | #include <linux/vexpress.h> |
17 | ||
310f80d6 RH |
18 | #define SYS_MISC 0x0 |
19 | #define SYS_MISC_MASTERSITE (1 << 14) | |
d06cfe3f | 20 | |
310f80d6 RH |
21 | #define SYS_PROCID0 0x24 |
22 | #define SYS_PROCID1 0x28 | |
23 | #define SYS_HBI_MASK 0xfff | |
24 | #define SYS_PROCIDx_HBI_SHIFT 0 | |
25 | ||
26 | #define SYS_CFGDATA 0x40 | |
27 | ||
28 | #define SYS_CFGCTRL 0x44 | |
d06cfe3f RH |
29 | #define SYS_CFGCTRL_START (1 << 31) |
30 | #define SYS_CFGCTRL_WRITE (1 << 30) | |
31 | #define SYS_CFGCTRL_DCC(n) (((n) & 0xf) << 26) | |
32 | #define SYS_CFGCTRL_FUNC(n) (((n) & 0x3f) << 20) | |
33 | #define SYS_CFGCTRL_SITE(n) (((n) & 0x3) << 16) | |
34 | #define SYS_CFGCTRL_POSITION(n) (((n) & 0xf) << 12) | |
35 | #define SYS_CFGCTRL_DEVICE(n) (((n) & 0xfff) << 0) | |
36 | ||
310f80d6 | 37 | #define SYS_CFGSTAT 0x48 |
d06cfe3f RH |
38 | #define SYS_CFGSTAT_ERR (1 << 1) |
39 | #define SYS_CFGSTAT_COMPLETE (1 << 0) | |
40 | ||
310f80d6 RH |
41 | #define VEXPRESS_SITE_MB 0 |
42 | #define VEXPRESS_SITE_DB1 1 | |
43 | #define VEXPRESS_SITE_DB2 2 | |
44 | #define VEXPRESS_SITE_MASTER 0xf | |
d06cfe3f RH |
45 | |
46 | struct vexpress_syscfg { | |
47 | struct device *dev; | |
48 | void __iomem *base; | |
49 | struct list_head funcs; | |
50 | }; | |
51 | ||
52 | struct vexpress_syscfg_func { | |
53 | struct list_head list; | |
54 | struct vexpress_syscfg *syscfg; | |
55 | struct regmap *regmap; | |
56 | int num_templates; | |
57 | u32 template[]; /* Keep it last! */ | |
58 | }; | |
59 | ||
60 | struct vexpress_config_bridge_ops { | |
61 | struct regmap * (*regmap_init)(struct device *dev, void *context); | |
62 | void (*regmap_exit)(struct regmap *regmap, void *context); | |
63 | }; | |
3b9334ac PM |
64 | |
65 | struct vexpress_config_bridge { | |
66 | struct vexpress_config_bridge_ops *ops; | |
67 | void *context; | |
68 | }; | |
69 | ||
70 | ||
71 | static DEFINE_MUTEX(vexpress_config_mutex); | |
3b9334ac PM |
72 | static u32 vexpress_config_site_master = VEXPRESS_SITE_MASTER; |
73 | ||
74 | ||
310f80d6 | 75 | static void vexpress_config_set_master(u32 site) |
3b9334ac PM |
76 | { |
77 | vexpress_config_site_master = site; | |
78 | } | |
79 | ||
d06cfe3f | 80 | static void vexpress_config_lock(void *arg) |
3b9334ac PM |
81 | { |
82 | mutex_lock(&vexpress_config_mutex); | |
83 | } | |
84 | ||
d06cfe3f | 85 | static void vexpress_config_unlock(void *arg) |
3b9334ac PM |
86 | { |
87 | mutex_unlock(&vexpress_config_mutex); | |
88 | } | |
89 | ||
90 | ||
91 | static void vexpress_config_find_prop(struct device_node *node, | |
92 | const char *name, u32 *val) | |
93 | { | |
94 | /* Default value */ | |
95 | *val = 0; | |
96 | ||
97 | of_node_get(node); | |
98 | while (node) { | |
99 | if (of_property_read_u32(node, name, val) == 0) { | |
100 | of_node_put(node); | |
101 | return; | |
102 | } | |
103 | node = of_get_next_parent(node); | |
104 | } | |
105 | } | |
106 | ||
d06cfe3f | 107 | static int vexpress_config_get_topo(struct device_node *node, u32 *site, |
3b9334ac PM |
108 | u32 *position, u32 *dcc) |
109 | { | |
110 | vexpress_config_find_prop(node, "arm,vexpress,site", site); | |
111 | if (*site == VEXPRESS_SITE_MASTER) | |
112 | *site = vexpress_config_site_master; | |
113 | if (WARN_ON(vexpress_config_site_master == VEXPRESS_SITE_MASTER)) | |
114 | return -EINVAL; | |
115 | vexpress_config_find_prop(node, "arm,vexpress,position", position); | |
116 | vexpress_config_find_prop(node, "arm,vexpress,dcc", dcc); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | ||
122 | static void vexpress_config_devres_release(struct device *dev, void *res) | |
123 | { | |
124 | struct vexpress_config_bridge *bridge = dev_get_drvdata(dev->parent); | |
125 | struct regmap *regmap = res; | |
126 | ||
127 | bridge->ops->regmap_exit(regmap, bridge->context); | |
128 | } | |
129 | ||
130 | struct regmap *devm_regmap_init_vexpress_config(struct device *dev) | |
131 | { | |
132 | struct vexpress_config_bridge *bridge; | |
133 | struct regmap *regmap; | |
134 | struct regmap **res; | |
135 | ||
3b9334ac PM |
136 | bridge = dev_get_drvdata(dev->parent); |
137 | if (WARN_ON(!bridge)) | |
138 | return ERR_PTR(-EINVAL); | |
139 | ||
140 | res = devres_alloc(vexpress_config_devres_release, sizeof(*res), | |
141 | GFP_KERNEL); | |
142 | if (!res) | |
143 | return ERR_PTR(-ENOMEM); | |
144 | ||
bbb4d872 | 145 | regmap = (bridge->ops->regmap_init)(dev, bridge->context); |
3b9334ac PM |
146 | if (IS_ERR(regmap)) { |
147 | devres_free(res); | |
148 | return regmap; | |
149 | } | |
150 | ||
151 | *res = regmap; | |
152 | devres_add(dev, res); | |
153 | ||
154 | return regmap; | |
155 | } | |
b33cdd28 | 156 | EXPORT_SYMBOL_GPL(devm_regmap_init_vexpress_config); |
3b9334ac | 157 | |
d06cfe3f RH |
158 | static int vexpress_syscfg_exec(struct vexpress_syscfg_func *func, |
159 | int index, bool write, u32 *data) | |
160 | { | |
161 | struct vexpress_syscfg *syscfg = func->syscfg; | |
162 | u32 command, status; | |
163 | int tries; | |
164 | long timeout; | |
165 | ||
166 | if (WARN_ON(index >= func->num_templates)) | |
167 | return -EINVAL; | |
168 | ||
169 | command = readl(syscfg->base + SYS_CFGCTRL); | |
170 | if (WARN_ON(command & SYS_CFGCTRL_START)) | |
171 | return -EBUSY; | |
172 | ||
173 | command = func->template[index]; | |
174 | command |= SYS_CFGCTRL_START; | |
175 | command |= write ? SYS_CFGCTRL_WRITE : 0; | |
176 | ||
177 | /* Use a canary for reads */ | |
178 | if (!write) | |
179 | *data = 0xdeadbeef; | |
180 | ||
181 | dev_dbg(syscfg->dev, "func %p, command %x, data %x\n", | |
182 | func, command, *data); | |
183 | writel(*data, syscfg->base + SYS_CFGDATA); | |
184 | writel(0, syscfg->base + SYS_CFGSTAT); | |
185 | writel(command, syscfg->base + SYS_CFGCTRL); | |
186 | mb(); | |
187 | ||
188 | /* The operation can take ages... Go to sleep, 100us initially */ | |
189 | tries = 100; | |
190 | timeout = 100; | |
191 | do { | |
192 | if (!irqs_disabled()) { | |
193 | set_current_state(TASK_INTERRUPTIBLE); | |
194 | schedule_timeout(usecs_to_jiffies(timeout)); | |
195 | if (signal_pending(current)) | |
196 | return -EINTR; | |
197 | } else { | |
198 | udelay(timeout); | |
199 | } | |
200 | ||
201 | status = readl(syscfg->base + SYS_CFGSTAT); | |
202 | if (status & SYS_CFGSTAT_ERR) | |
203 | return -EFAULT; | |
204 | ||
205 | if (timeout > 20) | |
206 | timeout -= 20; | |
207 | } while (--tries && !(status & SYS_CFGSTAT_COMPLETE)); | |
208 | if (WARN_ON_ONCE(!tries)) | |
209 | return -ETIMEDOUT; | |
210 | ||
211 | if (!write) { | |
212 | *data = readl(syscfg->base + SYS_CFGDATA); | |
213 | dev_dbg(syscfg->dev, "func %p, read data %x\n", func, *data); | |
214 | } | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static int vexpress_syscfg_read(void *context, unsigned int index, | |
220 | unsigned int *val) | |
221 | { | |
222 | struct vexpress_syscfg_func *func = context; | |
223 | ||
224 | return vexpress_syscfg_exec(func, index, false, val); | |
225 | } | |
226 | ||
227 | static int vexpress_syscfg_write(void *context, unsigned int index, | |
228 | unsigned int val) | |
229 | { | |
230 | struct vexpress_syscfg_func *func = context; | |
231 | ||
232 | return vexpress_syscfg_exec(func, index, true, &val); | |
233 | } | |
234 | ||
235 | static struct regmap_config vexpress_syscfg_regmap_config = { | |
236 | .lock = vexpress_config_lock, | |
237 | .unlock = vexpress_config_unlock, | |
238 | .reg_bits = 32, | |
239 | .val_bits = 32, | |
240 | .reg_read = vexpress_syscfg_read, | |
241 | .reg_write = vexpress_syscfg_write, | |
242 | .reg_format_endian = REGMAP_ENDIAN_LITTLE, | |
243 | .val_format_endian = REGMAP_ENDIAN_LITTLE, | |
244 | }; | |
245 | ||
246 | ||
247 | static struct regmap *vexpress_syscfg_regmap_init(struct device *dev, | |
248 | void *context) | |
249 | { | |
250 | int err; | |
251 | struct vexpress_syscfg *syscfg = context; | |
252 | struct vexpress_syscfg_func *func; | |
253 | struct property *prop; | |
254 | const __be32 *val = NULL; | |
255 | __be32 energy_quirk[4]; | |
256 | int num; | |
257 | u32 site, position, dcc; | |
258 | int i; | |
259 | ||
260 | err = vexpress_config_get_topo(dev->of_node, &site, | |
261 | &position, &dcc); | |
262 | if (err) | |
263 | return ERR_PTR(err); | |
264 | ||
265 | prop = of_find_property(dev->of_node, | |
266 | "arm,vexpress-sysreg,func", NULL); | |
267 | if (!prop) | |
268 | return ERR_PTR(-EINVAL); | |
269 | ||
270 | num = prop->length / sizeof(u32) / 2; | |
271 | val = prop->value; | |
272 | ||
273 | /* | |
274 | * "arm,vexpress-energy" function used to be described | |
275 | * by its first device only, now it requires both | |
276 | */ | |
277 | if (num == 1 && of_device_is_compatible(dev->of_node, | |
278 | "arm,vexpress-energy")) { | |
279 | num = 2; | |
280 | energy_quirk[0] = *val; | |
281 | energy_quirk[2] = *val++; | |
282 | energy_quirk[1] = *val; | |
283 | energy_quirk[3] = cpu_to_be32(be32_to_cpup(val) + 1); | |
284 | val = energy_quirk; | |
285 | } | |
286 | ||
287 | func = kzalloc(struct_size(func, template, num), GFP_KERNEL); | |
288 | if (!func) | |
289 | return ERR_PTR(-ENOMEM); | |
290 | ||
291 | func->syscfg = syscfg; | |
292 | func->num_templates = num; | |
293 | ||
294 | for (i = 0; i < num; i++) { | |
295 | u32 function, device; | |
296 | ||
297 | function = be32_to_cpup(val++); | |
298 | device = be32_to_cpup(val++); | |
299 | ||
300 | dev_dbg(dev, "func %p: %u/%u/%u/%u/%u\n", | |
301 | func, site, position, dcc, | |
302 | function, device); | |
303 | ||
304 | func->template[i] = SYS_CFGCTRL_DCC(dcc); | |
305 | func->template[i] |= SYS_CFGCTRL_SITE(site); | |
306 | func->template[i] |= SYS_CFGCTRL_POSITION(position); | |
307 | func->template[i] |= SYS_CFGCTRL_FUNC(function); | |
308 | func->template[i] |= SYS_CFGCTRL_DEVICE(device); | |
309 | } | |
310 | ||
311 | vexpress_syscfg_regmap_config.max_register = num - 1; | |
312 | ||
313 | func->regmap = regmap_init(dev, NULL, func, | |
314 | &vexpress_syscfg_regmap_config); | |
315 | ||
316 | if (IS_ERR(func->regmap)) { | |
317 | void *err = func->regmap; | |
318 | ||
319 | kfree(func); | |
320 | return err; | |
321 | } | |
322 | ||
323 | list_add(&func->list, &syscfg->funcs); | |
324 | ||
325 | return func->regmap; | |
326 | } | |
327 | ||
328 | static void vexpress_syscfg_regmap_exit(struct regmap *regmap, void *context) | |
329 | { | |
330 | struct vexpress_syscfg *syscfg = context; | |
331 | struct vexpress_syscfg_func *func, *tmp; | |
332 | ||
333 | regmap_exit(regmap); | |
334 | ||
335 | list_for_each_entry_safe(func, tmp, &syscfg->funcs, list) { | |
336 | if (func->regmap == regmap) { | |
337 | list_del(&syscfg->funcs); | |
338 | kfree(func); | |
339 | break; | |
340 | } | |
341 | } | |
342 | } | |
343 | ||
344 | static struct vexpress_config_bridge_ops vexpress_syscfg_bridge_ops = { | |
345 | .regmap_init = vexpress_syscfg_regmap_init, | |
346 | .regmap_exit = vexpress_syscfg_regmap_exit, | |
347 | }; | |
348 | ||
349 | ||
350 | static int vexpress_syscfg_probe(struct platform_device *pdev) | |
351 | { | |
352 | struct vexpress_syscfg *syscfg; | |
353 | struct resource *res; | |
a5a38765 RH |
354 | struct vexpress_config_bridge *bridge; |
355 | struct device_node *node; | |
310f80d6 RH |
356 | int master; |
357 | u32 dt_hbi; | |
d06cfe3f RH |
358 | |
359 | syscfg = devm_kzalloc(&pdev->dev, sizeof(*syscfg), GFP_KERNEL); | |
360 | if (!syscfg) | |
361 | return -ENOMEM; | |
362 | syscfg->dev = &pdev->dev; | |
363 | INIT_LIST_HEAD(&syscfg->funcs); | |
364 | ||
365 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
366 | syscfg->base = devm_ioremap_resource(&pdev->dev, res); | |
367 | if (IS_ERR(syscfg->base)) | |
368 | return PTR_ERR(syscfg->base); | |
369 | ||
a5a38765 RH |
370 | bridge = devm_kmalloc(&pdev->dev, sizeof(*bridge), GFP_KERNEL); |
371 | if (!bridge) | |
372 | return -ENOMEM; | |
373 | ||
374 | bridge->ops = &vexpress_syscfg_bridge_ops; | |
375 | bridge->context = syscfg; | |
376 | ||
377 | dev_set_drvdata(&pdev->dev, bridge); | |
d06cfe3f | 378 | |
310f80d6 RH |
379 | master = readl(syscfg->base + SYS_MISC) & SYS_MISC_MASTERSITE ? |
380 | VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1; | |
381 | vexpress_config_set_master(master); | |
382 | ||
383 | /* Confirm board type against DT property, if available */ | |
384 | if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) { | |
385 | u32 id = readl(syscfg->base + (master == VEXPRESS_SITE_DB1 ? | |
386 | SYS_PROCID0 : SYS_PROCID1)); | |
387 | u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK; | |
388 | ||
389 | if (WARN_ON(dt_hbi != hbi)) | |
390 | dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n", | |
391 | dt_hbi, hbi); | |
392 | } | |
393 | ||
a5a38765 RH |
394 | for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") { |
395 | struct device_node *bridge_np; | |
396 | ||
397 | bridge_np = of_parse_phandle(node, "arm,vexpress,config-bridge", 0); | |
398 | if (bridge_np != pdev->dev.parent->of_node) | |
399 | continue; | |
400 | ||
401 | of_platform_populate(node, NULL, NULL, &pdev->dev); | |
402 | } | |
403 | ||
404 | return 0; | |
d06cfe3f RH |
405 | } |
406 | ||
407 | static const struct platform_device_id vexpress_syscfg_id_table[] = { | |
408 | { "vexpress-syscfg", }, | |
409 | {}, | |
410 | }; | |
70e4758a | 411 | MODULE_DEVICE_TABLE(platform, vexpress_syscfg_id_table); |
d06cfe3f RH |
412 | |
413 | static struct platform_driver vexpress_syscfg_driver = { | |
414 | .driver.name = "vexpress-syscfg", | |
415 | .id_table = vexpress_syscfg_id_table, | |
416 | .probe = vexpress_syscfg_probe, | |
417 | }; | |
70e4758a RH |
418 | module_platform_driver(vexpress_syscfg_driver); |
419 | MODULE_LICENSE("GPL v2"); |