1 files changed, 419 insertions, 0 deletions
diff --git a/drivers/bus/vexpress-config.c b/drivers/bus/vexpress-config.c
new file mode 100644
index 000000000..a58ac0c8e
--- /dev/null
+++ b/drivers/bus/vexpress-config.c
@@ -0,0 +1,419 @@
+// 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");