11802d0beSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
23b9334acSPawel Moll /*
33b9334acSPawel Moll *
43b9334acSPawel Moll * Copyright (C) 2014 ARM Limited
53b9334acSPawel Moll */
63b9334acSPawel Moll
73b9334acSPawel Moll #include <linux/err.h>
83b9334acSPawel Moll #include <linux/init.h>
9d06cfe3fSRob Herring #include <linux/io.h>
1070e4758aSRob Herring #include <linux/module.h>
113b9334acSPawel Moll #include <linux/of.h>
12d06cfe3fSRob Herring #include <linux/platform_device.h>
1304ebdc35SRob Herring #include <linux/of_platform.h>
14d06cfe3fSRob Herring #include <linux/sched/signal.h>
15d06cfe3fSRob Herring #include <linux/slab.h>
163b9334acSPawel Moll #include <linux/vexpress.h>
173b9334acSPawel Moll
18310f80d6SRob Herring #define SYS_MISC 0x0
19310f80d6SRob Herring #define SYS_MISC_MASTERSITE (1 << 14)
20d06cfe3fSRob Herring
21310f80d6SRob Herring #define SYS_PROCID0 0x24
22310f80d6SRob Herring #define SYS_PROCID1 0x28
23310f80d6SRob Herring #define SYS_HBI_MASK 0xfff
24310f80d6SRob Herring #define SYS_PROCIDx_HBI_SHIFT 0
25310f80d6SRob Herring
26310f80d6SRob Herring #define SYS_CFGDATA 0x40
27310f80d6SRob Herring
28310f80d6SRob Herring #define SYS_CFGCTRL 0x44
29d06cfe3fSRob Herring #define SYS_CFGCTRL_START (1 << 31)
30d06cfe3fSRob Herring #define SYS_CFGCTRL_WRITE (1 << 30)
31d06cfe3fSRob Herring #define SYS_CFGCTRL_DCC(n) (((n) & 0xf) << 26)
32d06cfe3fSRob Herring #define SYS_CFGCTRL_FUNC(n) (((n) & 0x3f) << 20)
33d06cfe3fSRob Herring #define SYS_CFGCTRL_SITE(n) (((n) & 0x3) << 16)
34d06cfe3fSRob Herring #define SYS_CFGCTRL_POSITION(n) (((n) & 0xf) << 12)
35d06cfe3fSRob Herring #define SYS_CFGCTRL_DEVICE(n) (((n) & 0xfff) << 0)
36d06cfe3fSRob Herring
37310f80d6SRob Herring #define SYS_CFGSTAT 0x48
38d06cfe3fSRob Herring #define SYS_CFGSTAT_ERR (1 << 1)
39d06cfe3fSRob Herring #define SYS_CFGSTAT_COMPLETE (1 << 0)
40d06cfe3fSRob Herring
41310f80d6SRob Herring #define VEXPRESS_SITE_MB 0
42310f80d6SRob Herring #define VEXPRESS_SITE_DB1 1
43310f80d6SRob Herring #define VEXPRESS_SITE_DB2 2
44310f80d6SRob Herring #define VEXPRESS_SITE_MASTER 0xf
45d06cfe3fSRob Herring
46d06cfe3fSRob Herring struct vexpress_syscfg {
47d06cfe3fSRob Herring struct device *dev;
48d06cfe3fSRob Herring void __iomem *base;
49d06cfe3fSRob Herring struct list_head funcs;
50d06cfe3fSRob Herring };
51d06cfe3fSRob Herring
52d06cfe3fSRob Herring struct vexpress_syscfg_func {
53d06cfe3fSRob Herring struct list_head list;
54d06cfe3fSRob Herring struct vexpress_syscfg *syscfg;
55d06cfe3fSRob Herring struct regmap *regmap;
56d06cfe3fSRob Herring int num_templates;
57d06cfe3fSRob Herring u32 template[]; /* Keep it last! */
58d06cfe3fSRob Herring };
59d06cfe3fSRob Herring
60d06cfe3fSRob Herring struct vexpress_config_bridge_ops {
61d06cfe3fSRob Herring struct regmap * (*regmap_init)(struct device *dev, void *context);
62d06cfe3fSRob Herring void (*regmap_exit)(struct regmap *regmap, void *context);
63d06cfe3fSRob Herring };
643b9334acSPawel Moll
653b9334acSPawel Moll struct vexpress_config_bridge {
663b9334acSPawel Moll struct vexpress_config_bridge_ops *ops;
673b9334acSPawel Moll void *context;
683b9334acSPawel Moll };
693b9334acSPawel Moll
703b9334acSPawel Moll
713b9334acSPawel Moll static DEFINE_MUTEX(vexpress_config_mutex);
723b9334acSPawel Moll static u32 vexpress_config_site_master = VEXPRESS_SITE_MASTER;
733b9334acSPawel Moll
743b9334acSPawel Moll
vexpress_config_set_master(u32 site)75310f80d6SRob Herring static void vexpress_config_set_master(u32 site)
763b9334acSPawel Moll {
773b9334acSPawel Moll vexpress_config_site_master = site;
783b9334acSPawel Moll }
793b9334acSPawel Moll
vexpress_config_lock(void * arg)80d06cfe3fSRob Herring static void vexpress_config_lock(void *arg)
813b9334acSPawel Moll {
823b9334acSPawel Moll mutex_lock(&vexpress_config_mutex);
833b9334acSPawel Moll }
843b9334acSPawel Moll
vexpress_config_unlock(void * arg)85d06cfe3fSRob Herring static void vexpress_config_unlock(void *arg)
863b9334acSPawel Moll {
873b9334acSPawel Moll mutex_unlock(&vexpress_config_mutex);
883b9334acSPawel Moll }
893b9334acSPawel Moll
903b9334acSPawel Moll
vexpress_config_find_prop(struct device_node * node,const char * name,u32 * val)913b9334acSPawel Moll static void vexpress_config_find_prop(struct device_node *node,
923b9334acSPawel Moll const char *name, u32 *val)
933b9334acSPawel Moll {
943b9334acSPawel Moll /* Default value */
953b9334acSPawel Moll *val = 0;
963b9334acSPawel Moll
973b9334acSPawel Moll of_node_get(node);
983b9334acSPawel Moll while (node) {
993b9334acSPawel Moll if (of_property_read_u32(node, name, val) == 0) {
1003b9334acSPawel Moll of_node_put(node);
1013b9334acSPawel Moll return;
1023b9334acSPawel Moll }
1033b9334acSPawel Moll node = of_get_next_parent(node);
1043b9334acSPawel Moll }
1053b9334acSPawel Moll }
1063b9334acSPawel Moll
vexpress_config_get_topo(struct device_node * node,u32 * site,u32 * position,u32 * dcc)107d06cfe3fSRob Herring static int vexpress_config_get_topo(struct device_node *node, u32 *site,
1083b9334acSPawel Moll u32 *position, u32 *dcc)
1093b9334acSPawel Moll {
1103b9334acSPawel Moll vexpress_config_find_prop(node, "arm,vexpress,site", site);
1113b9334acSPawel Moll if (*site == VEXPRESS_SITE_MASTER)
1123b9334acSPawel Moll *site = vexpress_config_site_master;
1133b9334acSPawel Moll if (WARN_ON(vexpress_config_site_master == VEXPRESS_SITE_MASTER))
1143b9334acSPawel Moll return -EINVAL;
1153b9334acSPawel Moll vexpress_config_find_prop(node, "arm,vexpress,position", position);
1163b9334acSPawel Moll vexpress_config_find_prop(node, "arm,vexpress,dcc", dcc);
1173b9334acSPawel Moll
1183b9334acSPawel Moll return 0;
1193b9334acSPawel Moll }
1203b9334acSPawel Moll
1213b9334acSPawel Moll
vexpress_config_devres_release(struct device * dev,void * res)1223b9334acSPawel Moll static void vexpress_config_devres_release(struct device *dev, void *res)
1233b9334acSPawel Moll {
1243b9334acSPawel Moll struct vexpress_config_bridge *bridge = dev_get_drvdata(dev->parent);
1253b9334acSPawel Moll struct regmap *regmap = res;
1263b9334acSPawel Moll
1273b9334acSPawel Moll bridge->ops->regmap_exit(regmap, bridge->context);
1283b9334acSPawel Moll }
1293b9334acSPawel Moll
devm_regmap_init_vexpress_config(struct device * dev)1303b9334acSPawel Moll struct regmap *devm_regmap_init_vexpress_config(struct device *dev)
1313b9334acSPawel Moll {
1323b9334acSPawel Moll struct vexpress_config_bridge *bridge;
1333b9334acSPawel Moll struct regmap *regmap;
1343b9334acSPawel Moll struct regmap **res;
1353b9334acSPawel Moll
1363b9334acSPawel Moll bridge = dev_get_drvdata(dev->parent);
1373b9334acSPawel Moll if (WARN_ON(!bridge))
1383b9334acSPawel Moll return ERR_PTR(-EINVAL);
1393b9334acSPawel Moll
1403b9334acSPawel Moll res = devres_alloc(vexpress_config_devres_release, sizeof(*res),
1413b9334acSPawel Moll GFP_KERNEL);
1423b9334acSPawel Moll if (!res)
1433b9334acSPawel Moll return ERR_PTR(-ENOMEM);
1443b9334acSPawel Moll
145bbb4d872SNicolas Boichat regmap = (bridge->ops->regmap_init)(dev, bridge->context);
1463b9334acSPawel Moll if (IS_ERR(regmap)) {
1473b9334acSPawel Moll devres_free(res);
1483b9334acSPawel Moll return regmap;
1493b9334acSPawel Moll }
1503b9334acSPawel Moll
1513b9334acSPawel Moll *res = regmap;
1523b9334acSPawel Moll devres_add(dev, res);
1533b9334acSPawel Moll
1543b9334acSPawel Moll return regmap;
1553b9334acSPawel Moll }
156b33cdd28SArnd Bergmann EXPORT_SYMBOL_GPL(devm_regmap_init_vexpress_config);
1573b9334acSPawel Moll
vexpress_syscfg_exec(struct vexpress_syscfg_func * func,int index,bool write,u32 * data)158d06cfe3fSRob Herring static int vexpress_syscfg_exec(struct vexpress_syscfg_func *func,
159d06cfe3fSRob Herring int index, bool write, u32 *data)
160d06cfe3fSRob Herring {
161d06cfe3fSRob Herring struct vexpress_syscfg *syscfg = func->syscfg;
162d06cfe3fSRob Herring u32 command, status;
163d06cfe3fSRob Herring int tries;
164d06cfe3fSRob Herring long timeout;
165d06cfe3fSRob Herring
166d06cfe3fSRob Herring if (WARN_ON(index >= func->num_templates))
167d06cfe3fSRob Herring return -EINVAL;
168d06cfe3fSRob Herring
169d06cfe3fSRob Herring command = readl(syscfg->base + SYS_CFGCTRL);
170d06cfe3fSRob Herring if (WARN_ON(command & SYS_CFGCTRL_START))
171d06cfe3fSRob Herring return -EBUSY;
172d06cfe3fSRob Herring
173d06cfe3fSRob Herring command = func->template[index];
174d06cfe3fSRob Herring command |= SYS_CFGCTRL_START;
175d06cfe3fSRob Herring command |= write ? SYS_CFGCTRL_WRITE : 0;
176d06cfe3fSRob Herring
177d06cfe3fSRob Herring /* Use a canary for reads */
178d06cfe3fSRob Herring if (!write)
179d06cfe3fSRob Herring *data = 0xdeadbeef;
180d06cfe3fSRob Herring
181d06cfe3fSRob Herring dev_dbg(syscfg->dev, "func %p, command %x, data %x\n",
182d06cfe3fSRob Herring func, command, *data);
183d06cfe3fSRob Herring writel(*data, syscfg->base + SYS_CFGDATA);
184d06cfe3fSRob Herring writel(0, syscfg->base + SYS_CFGSTAT);
185d06cfe3fSRob Herring writel(command, syscfg->base + SYS_CFGCTRL);
186d06cfe3fSRob Herring mb();
187d06cfe3fSRob Herring
188d06cfe3fSRob Herring /* The operation can take ages... Go to sleep, 100us initially */
189d06cfe3fSRob Herring tries = 100;
190d06cfe3fSRob Herring timeout = 100;
191d06cfe3fSRob Herring do {
192d06cfe3fSRob Herring if (!irqs_disabled()) {
193d06cfe3fSRob Herring set_current_state(TASK_INTERRUPTIBLE);
194d06cfe3fSRob Herring schedule_timeout(usecs_to_jiffies(timeout));
195d06cfe3fSRob Herring if (signal_pending(current))
196d06cfe3fSRob Herring return -EINTR;
197d06cfe3fSRob Herring } else {
198d06cfe3fSRob Herring udelay(timeout);
199d06cfe3fSRob Herring }
200d06cfe3fSRob Herring
201d06cfe3fSRob Herring status = readl(syscfg->base + SYS_CFGSTAT);
202d06cfe3fSRob Herring if (status & SYS_CFGSTAT_ERR)
203d06cfe3fSRob Herring return -EFAULT;
204d06cfe3fSRob Herring
205d06cfe3fSRob Herring if (timeout > 20)
206d06cfe3fSRob Herring timeout -= 20;
207d06cfe3fSRob Herring } while (--tries && !(status & SYS_CFGSTAT_COMPLETE));
208d06cfe3fSRob Herring if (WARN_ON_ONCE(!tries))
209d06cfe3fSRob Herring return -ETIMEDOUT;
210d06cfe3fSRob Herring
211d06cfe3fSRob Herring if (!write) {
212d06cfe3fSRob Herring *data = readl(syscfg->base + SYS_CFGDATA);
213d06cfe3fSRob Herring dev_dbg(syscfg->dev, "func %p, read data %x\n", func, *data);
214d06cfe3fSRob Herring }
215d06cfe3fSRob Herring
216d06cfe3fSRob Herring return 0;
217d06cfe3fSRob Herring }
218d06cfe3fSRob Herring
vexpress_syscfg_read(void * context,unsigned int index,unsigned int * val)219d06cfe3fSRob Herring static int vexpress_syscfg_read(void *context, unsigned int index,
220d06cfe3fSRob Herring unsigned int *val)
221d06cfe3fSRob Herring {
222d06cfe3fSRob Herring struct vexpress_syscfg_func *func = context;
223d06cfe3fSRob Herring
224d06cfe3fSRob Herring return vexpress_syscfg_exec(func, index, false, val);
225d06cfe3fSRob Herring }
226d06cfe3fSRob Herring
vexpress_syscfg_write(void * context,unsigned int index,unsigned int val)227d06cfe3fSRob Herring static int vexpress_syscfg_write(void *context, unsigned int index,
228d06cfe3fSRob Herring unsigned int val)
229d06cfe3fSRob Herring {
230d06cfe3fSRob Herring struct vexpress_syscfg_func *func = context;
231d06cfe3fSRob Herring
232d06cfe3fSRob Herring return vexpress_syscfg_exec(func, index, true, &val);
233d06cfe3fSRob Herring }
234d06cfe3fSRob Herring
235d06cfe3fSRob Herring static struct regmap_config vexpress_syscfg_regmap_config = {
236d06cfe3fSRob Herring .lock = vexpress_config_lock,
237d06cfe3fSRob Herring .unlock = vexpress_config_unlock,
238d06cfe3fSRob Herring .reg_bits = 32,
239d06cfe3fSRob Herring .val_bits = 32,
240d06cfe3fSRob Herring .reg_read = vexpress_syscfg_read,
241d06cfe3fSRob Herring .reg_write = vexpress_syscfg_write,
242d06cfe3fSRob Herring .reg_format_endian = REGMAP_ENDIAN_LITTLE,
243d06cfe3fSRob Herring .val_format_endian = REGMAP_ENDIAN_LITTLE,
244d06cfe3fSRob Herring };
245d06cfe3fSRob Herring
246d06cfe3fSRob Herring
vexpress_syscfg_regmap_init(struct device * dev,void * context)247d06cfe3fSRob Herring static struct regmap *vexpress_syscfg_regmap_init(struct device *dev,
248d06cfe3fSRob Herring void *context)
249d06cfe3fSRob Herring {
250d06cfe3fSRob Herring int err;
251d06cfe3fSRob Herring struct vexpress_syscfg *syscfg = context;
252d06cfe3fSRob Herring struct vexpress_syscfg_func *func;
253d06cfe3fSRob Herring struct property *prop;
254d06cfe3fSRob Herring const __be32 *val = NULL;
255d06cfe3fSRob Herring __be32 energy_quirk[4];
256d06cfe3fSRob Herring int num;
257d06cfe3fSRob Herring u32 site, position, dcc;
258d06cfe3fSRob Herring int i;
259d06cfe3fSRob Herring
260d06cfe3fSRob Herring err = vexpress_config_get_topo(dev->of_node, &site,
261d06cfe3fSRob Herring &position, &dcc);
262d06cfe3fSRob Herring if (err)
263d06cfe3fSRob Herring return ERR_PTR(err);
264d06cfe3fSRob Herring
265d06cfe3fSRob Herring prop = of_find_property(dev->of_node,
266d06cfe3fSRob Herring "arm,vexpress-sysreg,func", NULL);
267d06cfe3fSRob Herring if (!prop)
268d06cfe3fSRob Herring return ERR_PTR(-EINVAL);
269d06cfe3fSRob Herring
270d06cfe3fSRob Herring num = prop->length / sizeof(u32) / 2;
271d06cfe3fSRob Herring val = prop->value;
272d06cfe3fSRob Herring
273d06cfe3fSRob Herring /*
274d06cfe3fSRob Herring * "arm,vexpress-energy" function used to be described
275d06cfe3fSRob Herring * by its first device only, now it requires both
276d06cfe3fSRob Herring */
277d06cfe3fSRob Herring if (num == 1 && of_device_is_compatible(dev->of_node,
278d06cfe3fSRob Herring "arm,vexpress-energy")) {
279d06cfe3fSRob Herring num = 2;
280d06cfe3fSRob Herring energy_quirk[0] = *val;
281d06cfe3fSRob Herring energy_quirk[2] = *val++;
282d06cfe3fSRob Herring energy_quirk[1] = *val;
283d06cfe3fSRob Herring energy_quirk[3] = cpu_to_be32(be32_to_cpup(val) + 1);
284d06cfe3fSRob Herring val = energy_quirk;
285d06cfe3fSRob Herring }
286d06cfe3fSRob Herring
287d06cfe3fSRob Herring func = kzalloc(struct_size(func, template, num), GFP_KERNEL);
288d06cfe3fSRob Herring if (!func)
289d06cfe3fSRob Herring return ERR_PTR(-ENOMEM);
290d06cfe3fSRob Herring
291d06cfe3fSRob Herring func->syscfg = syscfg;
292d06cfe3fSRob Herring func->num_templates = num;
293d06cfe3fSRob Herring
294d06cfe3fSRob Herring for (i = 0; i < num; i++) {
295d06cfe3fSRob Herring u32 function, device;
296d06cfe3fSRob Herring
297d06cfe3fSRob Herring function = be32_to_cpup(val++);
298d06cfe3fSRob Herring device = be32_to_cpup(val++);
299d06cfe3fSRob Herring
300d06cfe3fSRob Herring dev_dbg(dev, "func %p: %u/%u/%u/%u/%u\n",
301d06cfe3fSRob Herring func, site, position, dcc,
302d06cfe3fSRob Herring function, device);
303d06cfe3fSRob Herring
304d06cfe3fSRob Herring func->template[i] = SYS_CFGCTRL_DCC(dcc);
305d06cfe3fSRob Herring func->template[i] |= SYS_CFGCTRL_SITE(site);
306d06cfe3fSRob Herring func->template[i] |= SYS_CFGCTRL_POSITION(position);
307d06cfe3fSRob Herring func->template[i] |= SYS_CFGCTRL_FUNC(function);
308d06cfe3fSRob Herring func->template[i] |= SYS_CFGCTRL_DEVICE(device);
309d06cfe3fSRob Herring }
310d06cfe3fSRob Herring
311d06cfe3fSRob Herring vexpress_syscfg_regmap_config.max_register = num - 1;
312d06cfe3fSRob Herring
313d06cfe3fSRob Herring func->regmap = regmap_init(dev, NULL, func,
314d06cfe3fSRob Herring &vexpress_syscfg_regmap_config);
315d06cfe3fSRob Herring
316d06cfe3fSRob Herring if (IS_ERR(func->regmap)) {
317d06cfe3fSRob Herring void *err = func->regmap;
318d06cfe3fSRob Herring
319d06cfe3fSRob Herring kfree(func);
320d06cfe3fSRob Herring return err;
321d06cfe3fSRob Herring }
322d06cfe3fSRob Herring
323d06cfe3fSRob Herring list_add(&func->list, &syscfg->funcs);
324d06cfe3fSRob Herring
325d06cfe3fSRob Herring return func->regmap;
326d06cfe3fSRob Herring }
327d06cfe3fSRob Herring
vexpress_syscfg_regmap_exit(struct regmap * regmap,void * context)328d06cfe3fSRob Herring static void vexpress_syscfg_regmap_exit(struct regmap *regmap, void *context)
329d06cfe3fSRob Herring {
330d06cfe3fSRob Herring struct vexpress_syscfg *syscfg = context;
331d06cfe3fSRob Herring struct vexpress_syscfg_func *func, *tmp;
332d06cfe3fSRob Herring
333d06cfe3fSRob Herring regmap_exit(regmap);
334d06cfe3fSRob Herring
335d06cfe3fSRob Herring list_for_each_entry_safe(func, tmp, &syscfg->funcs, list) {
336d06cfe3fSRob Herring if (func->regmap == regmap) {
337d06cfe3fSRob Herring list_del(&syscfg->funcs);
338d06cfe3fSRob Herring kfree(func);
339d06cfe3fSRob Herring break;
340d06cfe3fSRob Herring }
341d06cfe3fSRob Herring }
342d06cfe3fSRob Herring }
343d06cfe3fSRob Herring
344d06cfe3fSRob Herring static struct vexpress_config_bridge_ops vexpress_syscfg_bridge_ops = {
345d06cfe3fSRob Herring .regmap_init = vexpress_syscfg_regmap_init,
346d06cfe3fSRob Herring .regmap_exit = vexpress_syscfg_regmap_exit,
347d06cfe3fSRob Herring };
348d06cfe3fSRob Herring
349d06cfe3fSRob Herring
vexpress_syscfg_probe(struct platform_device * pdev)350d06cfe3fSRob Herring static int vexpress_syscfg_probe(struct platform_device *pdev)
351d06cfe3fSRob Herring {
352d06cfe3fSRob Herring struct vexpress_syscfg *syscfg;
353a5a38765SRob Herring struct vexpress_config_bridge *bridge;
354a5a38765SRob Herring struct device_node *node;
355310f80d6SRob Herring int master;
356310f80d6SRob Herring u32 dt_hbi;
357d06cfe3fSRob Herring
358d06cfe3fSRob Herring syscfg = devm_kzalloc(&pdev->dev, sizeof(*syscfg), GFP_KERNEL);
359d06cfe3fSRob Herring if (!syscfg)
360d06cfe3fSRob Herring return -ENOMEM;
361d06cfe3fSRob Herring syscfg->dev = &pdev->dev;
362d06cfe3fSRob Herring INIT_LIST_HEAD(&syscfg->funcs);
363d06cfe3fSRob Herring
364*bc0e7696SYangtao Li syscfg->base = devm_platform_ioremap_resource(pdev, 0);
365d06cfe3fSRob Herring if (IS_ERR(syscfg->base))
366d06cfe3fSRob Herring return PTR_ERR(syscfg->base);
367d06cfe3fSRob Herring
368a5a38765SRob Herring bridge = devm_kmalloc(&pdev->dev, sizeof(*bridge), GFP_KERNEL);
369a5a38765SRob Herring if (!bridge)
370a5a38765SRob Herring return -ENOMEM;
371d06cfe3fSRob Herring
372a5a38765SRob Herring bridge->ops = &vexpress_syscfg_bridge_ops;
373a5a38765SRob Herring bridge->context = syscfg;
374a5a38765SRob Herring
375a5a38765SRob Herring dev_set_drvdata(&pdev->dev, bridge);
376a5a38765SRob Herring
377310f80d6SRob Herring master = readl(syscfg->base + SYS_MISC) & SYS_MISC_MASTERSITE ?
378310f80d6SRob Herring VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1;
379310f80d6SRob Herring vexpress_config_set_master(master);
380310f80d6SRob Herring
381310f80d6SRob Herring /* Confirm board type against DT property, if available */
382310f80d6SRob Herring if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) {
383310f80d6SRob Herring u32 id = readl(syscfg->base + (master == VEXPRESS_SITE_DB1 ?
384310f80d6SRob Herring SYS_PROCID0 : SYS_PROCID1));
385310f80d6SRob Herring u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;
386310f80d6SRob Herring
387310f80d6SRob Herring if (WARN_ON(dt_hbi != hbi))
388310f80d6SRob Herring dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n",
389310f80d6SRob Herring dt_hbi, hbi);
390310f80d6SRob Herring }
391310f80d6SRob Herring
392a5a38765SRob Herring for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") {
393a5a38765SRob Herring struct device_node *bridge_np;
394a5a38765SRob Herring
395a5a38765SRob Herring bridge_np = of_parse_phandle(node, "arm,vexpress,config-bridge", 0);
396a5a38765SRob Herring if (bridge_np != pdev->dev.parent->of_node)
397a5a38765SRob Herring continue;
398a5a38765SRob Herring
399a5a38765SRob Herring of_platform_populate(node, NULL, NULL, &pdev->dev);
400a5a38765SRob Herring }
401a5a38765SRob Herring
402a5a38765SRob Herring return 0;
403d06cfe3fSRob Herring }
404d06cfe3fSRob Herring
405d06cfe3fSRob Herring static const struct platform_device_id vexpress_syscfg_id_table[] = {
406d06cfe3fSRob Herring { "vexpress-syscfg", },
407d06cfe3fSRob Herring {},
408d06cfe3fSRob Herring };
40970e4758aSRob Herring MODULE_DEVICE_TABLE(platform, vexpress_syscfg_id_table);
410d06cfe3fSRob Herring
411d06cfe3fSRob Herring static struct platform_driver vexpress_syscfg_driver = {
412d06cfe3fSRob Herring .driver.name = "vexpress-syscfg",
413d06cfe3fSRob Herring .id_table = vexpress_syscfg_id_table,
414d06cfe3fSRob Herring .probe = vexpress_syscfg_probe,
415d06cfe3fSRob Herring };
41670e4758aSRob Herring module_platform_driver(vexpress_syscfg_driver);
41770e4758aSRob Herring MODULE_LICENSE("GPL v2");
418