[linux-block.git] / drivers / bus / vexpress-config.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * Copyright (C) 2014 ARM Limited
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/vexpress.h>

#define SYS_MISC		0x0
#define SYS_MISC_MASTERSITE	(1 << 14)

#define SYS_PROCID0		0x24
#define SYS_PROCID1		0x28
#define SYS_HBI_MASK		0xfff
#define SYS_PROCIDx_HBI_SHIFT	0

#define SYS_CFGDATA		0x40

#define SYS_CFGCTRL		0x44
#define SYS_CFGCTRL_START	(1 << 31)
#define SYS_CFGCTRL_WRITE	(1 << 30)
#define SYS_CFGCTRL_DCC(n)	(((n) & 0xf) << 26)
#define SYS_CFGCTRL_FUNC(n)	(((n) & 0x3f) << 20)
#define SYS_CFGCTRL_SITE(n)	(((n) & 0x3) << 16)
#define SYS_CFGCTRL_POSITION(n)	(((n) & 0xf) << 12)
#define SYS_CFGCTRL_DEVICE(n)	(((n) & 0xfff) << 0)

#define SYS_CFGSTAT		0x48
#define SYS_CFGSTAT_ERR		(1 << 1)
#define SYS_CFGSTAT_COMPLETE	(1 << 0)

#define VEXPRESS_SITE_MB		0
#define VEXPRESS_SITE_DB1		1
#define VEXPRESS_SITE_DB2		2
#define VEXPRESS_SITE_MASTER		0xf

struct vexpress_syscfg {
	struct device *dev;
	void __iomem *base;
	struct list_head funcs;
};

struct vexpress_syscfg_func {
	struct list_head list;
	struct vexpress_syscfg *syscfg;
	struct regmap *regmap;
	int num_templates;
	u32 template[]; /* Keep it last! */
};

struct vexpress_config_bridge_ops {
	struct regmap * (*regmap_init)(struct device *dev, void *context);
	void (*regmap_exit)(struct regmap *regmap, void *context);
};

struct vexpress_config_bridge {
	struct vexpress_config_bridge_ops *ops;
	void *context;
};


static DEFINE_MUTEX(vexpress_config_mutex);
static u32 vexpress_config_site_master = VEXPRESS_SITE_MASTER;


static void vexpress_config_set_master(u32 site)
{
	vexpress_config_site_master = site;
}

static void vexpress_config_lock(void *arg)
{
	mutex_lock(&vexpress_config_mutex);
}

static void vexpress_config_unlock(void *arg)
{
	mutex_unlock(&vexpress_config_mutex);
}


static void vexpress_config_find_prop(struct device_node *node,
		const char *name, u32 *val)
{
	/* Default value */
	*val = 0;

	of_node_get(node);
	while (node) {
		if (of_property_read_u32(node, name, val) == 0) {
			of_node_put(node);
			return;
		}
		node = of_get_next_parent(node);
	}
}

static int vexpress_config_get_topo(struct device_node *node, u32 *site,
		u32 *position, u32 *dcc)
{
	vexpress_config_find_prop(node, "arm,vexpress,site", site);
	if (*site == VEXPRESS_SITE_MASTER)
		*site = vexpress_config_site_master;
	if (WARN_ON(vexpress_config_site_master == VEXPRESS_SITE_MASTER))
		return -EINVAL;
	vexpress_config_find_prop(node, "arm,vexpress,position", position);
	vexpress_config_find_prop(node, "arm,vexpress,dcc", dcc);

	return 0;
}


static void vexpress_config_devres_release(struct device *dev, void *res)
{
	struct vexpress_config_bridge *bridge = dev_get_drvdata(dev->parent);
	struct regmap *regmap = res;

	bridge->ops->regmap_exit(regmap, bridge->context);
}

struct regmap *devm_regmap_init_vexpress_config(struct device *dev)
{
	struct vexpress_config_bridge *bridge;
	struct regmap *regmap;
	struct regmap **res;

	bridge = dev_get_drvdata(dev->parent);
	if (WARN_ON(!bridge))
		return ERR_PTR(-EINVAL);

	res = devres_alloc(vexpress_config_devres_release, sizeof(*res),
			GFP_KERNEL);
	if (!res)
		return ERR_PTR(-ENOMEM);

	regmap = (bridge->ops->regmap_init)(dev, bridge->context);
	if (IS_ERR(regmap)) {
		devres_free(res);
		return regmap;
	}

	*res = regmap;
	devres_add(dev, res);

	return regmap;
}
EXPORT_SYMBOL_GPL(devm_regmap_init_vexpress_config);

static int vexpress_syscfg_exec(struct vexpress_syscfg_func *func,
		int index, bool write, u32 *data)
{
	struct vexpress_syscfg *syscfg = func->syscfg;
	u32 command, status;
	int tries;
	long timeout;

	if (WARN_ON(index >= func->num_templates))
		return -EINVAL;

	command = readl(syscfg->base + SYS_CFGCTRL);
	if (WARN_ON(command & SYS_CFGCTRL_START))
		return -EBUSY;

	command = func->template[index];
	command |= SYS_CFGCTRL_START;
	command |= write ? SYS_CFGCTRL_WRITE : 0;

	/* Use a canary for reads */
	if (!write)
		*data = 0xdeadbeef;

	dev_dbg(syscfg->dev, "func %p, command %x, data %x\n",
			func, command, *data);
	writel(*data, syscfg->base + SYS_CFGDATA);
	writel(0, syscfg->base + SYS_CFGSTAT);
	writel(command, syscfg->base + SYS_CFGCTRL);
	mb();

	/* The operation can take ages... Go to sleep, 100us initially */
	tries = 100;
	timeout = 100;
	do {
		if (!irqs_disabled()) {
			set_current_state(TASK_INTERRUPTIBLE);
			schedule_timeout(usecs_to_jiffies(timeout));
			if (signal_pending(current))
				return -EINTR;
		} else {
			udelay(timeout);
		}

		status = readl(syscfg->base + SYS_CFGSTAT);
		if (status & SYS_CFGSTAT_ERR)
			return -EFAULT;

		if (timeout > 20)
			timeout -= 20;
	} while (--tries && !(status & SYS_CFGSTAT_COMPLETE));
	if (WARN_ON_ONCE(!tries))
		return -ETIMEDOUT;

	if (!write) {
		*data = readl(syscfg->base + SYS_CFGDATA);
		dev_dbg(syscfg->dev, "func %p, read data %x\n", func, *data);
	}

	return 0;
}

static int vexpress_syscfg_read(void *context, unsigned int index,
		unsigned int *val)
{
	struct vexpress_syscfg_func *func = context;

	return vexpress_syscfg_exec(func, index, false, val);
}

static int vexpress_syscfg_write(void *context, unsigned int index,
		unsigned int val)
{
	struct vexpress_syscfg_func *func = context;

	return vexpress_syscfg_exec(func, index, true, &val);
}

static struct regmap_config vexpress_syscfg_regmap_config = {
	.lock = vexpress_config_lock,
	.unlock = vexpress_config_unlock,
	.reg_bits = 32,
	.val_bits = 32,
	.reg_read = vexpress_syscfg_read,
	.reg_write = vexpress_syscfg_write,
	.reg_format_endian = REGMAP_ENDIAN_LITTLE,
	.val_format_endian = REGMAP_ENDIAN_LITTLE,
};


static struct regmap *vexpress_syscfg_regmap_init(struct device *dev,
		void *context)
{
	int err;
	struct vexpress_syscfg *syscfg = context;
	struct vexpress_syscfg_func *func;
	struct property *prop;
	const __be32 *val = NULL;
	__be32 energy_quirk[4];
	int num;
	u32 site, position, dcc;
	int i;

	err = vexpress_config_get_topo(dev->of_node, &site,
				&position, &dcc);
	if (err)
		return ERR_PTR(err);

	prop = of_find_property(dev->of_node,
			"arm,vexpress-sysreg,func", NULL);
	if (!prop)
		return ERR_PTR(-EINVAL);

	num = prop->length / sizeof(u32) / 2;
	val = prop->value;

	/*
	 * "arm,vexpress-energy" function used to be described
	 * by its first device only, now it requires both
	 */
	if (num == 1 && of_device_is_compatible(dev->of_node,
			"arm,vexpress-energy")) {
		num = 2;
		energy_quirk[0] = *val;
		energy_quirk[2] = *val++;
		energy_quirk[1] = *val;
		energy_quirk[3] = cpu_to_be32(be32_to_cpup(val) + 1);
		val = energy_quirk;
	}

	func = kzalloc(struct_size(func, template, num), GFP_KERNEL);
	if (!func)
		return ERR_PTR(-ENOMEM);

	func->syscfg = syscfg;
	func->num_templates = num;

	for (i = 0; i < num; i++) {
		u32 function, device;

		function = be32_to_cpup(val++);
		device = be32_to_cpup(val++);

		dev_dbg(dev, "func %p: %u/%u/%u/%u/%u\n",
				func, site, position, dcc,
				function, device);

		func->template[i] = SYS_CFGCTRL_DCC(dcc);
		func->template[i] |= SYS_CFGCTRL_SITE(site);
		func->template[i] |= SYS_CFGCTRL_POSITION(position);
		func->template[i] |= SYS_CFGCTRL_FUNC(function);
		func->template[i] |= SYS_CFGCTRL_DEVICE(device);
	}

	vexpress_syscfg_regmap_config.max_register = num - 1;

	func->regmap = regmap_init(dev, NULL, func,
			&vexpress_syscfg_regmap_config);

	if (IS_ERR(func->regmap)) {
		void *err = func->regmap;

		kfree(func);
		return err;
	}

	list_add(&func->list, &syscfg->funcs);

	return func->regmap;
}

static void vexpress_syscfg_regmap_exit(struct regmap *regmap, void *context)
{
	struct vexpress_syscfg *syscfg = context;
	struct vexpress_syscfg_func *func, *tmp;

	regmap_exit(regmap);

	list_for_each_entry_safe(func, tmp, &syscfg->funcs, list) {
		if (func->regmap == regmap) {
			list_del(&syscfg->funcs);
			kfree(func);
			break;
		}
	}
}

static struct vexpress_config_bridge_ops vexpress_syscfg_bridge_ops = {
	.regmap_init = vexpress_syscfg_regmap_init,
	.regmap_exit = vexpress_syscfg_regmap_exit,
};


static int vexpress_syscfg_probe(struct platform_device *pdev)
{
	struct vexpress_syscfg *syscfg;
	struct resource *res;
	struct vexpress_config_bridge *bridge;
	struct device_node *node;
	int master;
	u32 dt_hbi;

	syscfg = devm_kzalloc(&pdev->dev, sizeof(*syscfg), GFP_KERNEL);
	if (!syscfg)
		return -ENOMEM;
	syscfg->dev = &pdev->dev;
	INIT_LIST_HEAD(&syscfg->funcs);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	syscfg->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(syscfg->base))
		return PTR_ERR(syscfg->base);

	bridge = devm_kmalloc(&pdev->dev, sizeof(*bridge), GFP_KERNEL);
	if (!bridge)
		return -ENOMEM;

	bridge->ops = &vexpress_syscfg_bridge_ops;
	bridge->context = syscfg;

	dev_set_drvdata(&pdev->dev, bridge);

	master = readl(syscfg->base + SYS_MISC) & SYS_MISC_MASTERSITE ?
			VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1;
	vexpress_config_set_master(master);

	/* Confirm board type against DT property, if available */
	if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) {
		u32 id = readl(syscfg->base + (master == VEXPRESS_SITE_DB1 ?
				 SYS_PROCID0 : SYS_PROCID1));
		u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;

		if (WARN_ON(dt_hbi != hbi))
			dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n",
					dt_hbi, hbi);
	}

	for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") {
		struct device_node *bridge_np;

		bridge_np = of_parse_phandle(node, "arm,vexpress,config-bridge", 0);
		if (bridge_np != pdev->dev.parent->of_node)
			continue;

		of_platform_populate(node, NULL, NULL, &pdev->dev);
	}

	return 0;
}

static const struct platform_device_id vexpress_syscfg_id_table[] = {
	{ "vexpress-syscfg", },
	{},
};
MODULE_DEVICE_TABLE(platform, vexpress_syscfg_id_table);

static struct platform_driver vexpress_syscfg_driver = {
	.driver.name = "vexpress-syscfg",
	.id_table = vexpress_syscfg_id_table,
	.probe = vexpress_syscfg_probe,
};
module_platform_driver(vexpress_syscfg_driver);
MODULE_LICENSE("GPL v2");
Commit	Line	Data
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>
d06cfe3f RH	15	#include <linux/slab.h>
3b9334ac PM	16	#include <linux/vexpress.h>
3b9334ac PM	17
310f80d6 RH	18	#define SYS_MISC 0x0
310f80d6 RH	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;
a5a38765 RH	355	struct device_node *node;
310f80d6 RH	356	int master;
310f80d6 RH	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);
70e4758a RH	419	MODULE_LICENSE("GPL v2");