[linux-2.6-block.git] / drivers / bus / ti-sysc.c

/*
 * ti-sysc.c - Texas Instruments sysc interconnect target driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/io.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>

enum sysc_registers {
	SYSC_REVISION,
	SYSC_SYSCONFIG,
	SYSC_SYSSTATUS,
	SYSC_MAX_REGS,
};

static const char * const reg_names[] = { "rev", "sysc", "syss", };

enum sysc_clocks {
	SYSC_FCK,
	SYSC_ICK,
	SYSC_MAX_CLOCKS,
};

static const char * const clock_names[] = { "fck", "ick", };

/**
 * struct sysc - TI sysc interconnect target module registers and capabilities
 * @dev: struct device pointer
 * @module_pa: physical address of the interconnect target module
 * @module_size: size of the interconnect target module
 * @module_va: virtual address of the interconnect target module
 * @offsets: register offsets from module base
 * @clocks: clocks used by the interconnect target module
 * @legacy_mode: configured for legacy mode if set
 */
struct sysc {
	struct device *dev;
	u64 module_pa;
	u32 module_size;
	void __iomem *module_va;
	int offsets[SYSC_MAX_REGS];
	struct clk *clocks[SYSC_MAX_CLOCKS];
	const char *legacy_mode;
};

static u32 sysc_read_revision(struct sysc *ddata)
{
	return readl_relaxed(ddata->module_va +
			     ddata->offsets[SYSC_REVISION]);
}

static int sysc_get_one_clock(struct sysc *ddata,
			      enum sysc_clocks index)
{
	const char *name;
	int error;

	switch (index) {
	case SYSC_FCK:
		break;
	case SYSC_ICK:
		break;
	default:
		return -EINVAL;
	}
	name = clock_names[index];

	ddata->clocks[index] = devm_clk_get(ddata->dev, name);
	if (IS_ERR(ddata->clocks[index])) {
		if (PTR_ERR(ddata->clocks[index]) == -ENOENT)
			return 0;

		dev_err(ddata->dev, "clock get error for %s: %li\n",
			name, PTR_ERR(ddata->clocks[index]));

		return PTR_ERR(ddata->clocks[index]);
	}

	error = clk_prepare(ddata->clocks[index]);
	if (error) {
		dev_err(ddata->dev, "clock prepare error for %s: %i\n",
			name, error);

		return error;
	}

	return 0;
}

static int sysc_get_clocks(struct sysc *ddata)
{
	int i, error;

	if (ddata->legacy_mode)
		return 0;

	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
		error = sysc_get_one_clock(ddata, i);
		if (error && error != -ENOENT)
			return error;
	}

	return 0;
}

/**
 * sysc_parse_and_check_child_range - parses module IO region from ranges
 * @ddata: device driver data
 *
 * In general we only need rev, syss, and sysc registers and not the whole
 * module range. But we do want the offsets for these registers from the
 * module base. This allows us to check them against the legacy hwmod
 * platform data. Let's also check the ranges are configured properly.
 */
static int sysc_parse_and_check_child_range(struct sysc *ddata)
{
	struct device_node *np = ddata->dev->of_node;
	const __be32 *ranges;
	u32 nr_addr, nr_size;
	int len, error;

	ranges = of_get_property(np, "ranges", &len);
	if (!ranges) {
		dev_err(ddata->dev, "missing ranges for %pOF\n", np);

		return -ENOENT;
	}

	len /= sizeof(*ranges);

	if (len < 3) {
		dev_err(ddata->dev, "incomplete ranges for %pOF\n", np);

		return -EINVAL;
	}

	error = of_property_read_u32(np, "#address-cells", &nr_addr);
	if (error)
		return -ENOENT;

	error = of_property_read_u32(np, "#size-cells", &nr_size);
	if (error)
		return -ENOENT;

	if (nr_addr != 1 || nr_size != 1) {
		dev_err(ddata->dev, "invalid ranges for %pOF\n", np);

		return -EINVAL;
	}

	ranges++;
	ddata->module_pa = of_translate_address(np, ranges++);
	ddata->module_size = be32_to_cpup(ranges);

	dev_dbg(ddata->dev, "interconnect target 0x%llx size 0x%x for %pOF\n",
		ddata->module_pa, ddata->module_size, np);

	return 0;
}

/**
 * sysc_check_one_child - check child configuration
 * @ddata: device driver data
 * @np: child device node
 *
 * Let's avoid messy situations where we have new interconnect target
 * node but children have "ti,hwmods". These belong to the interconnect
 * target node and are managed by this driver.
 */
static int sysc_check_one_child(struct sysc *ddata,
				struct device_node *np)
{
	const char *name;

	name = of_get_property(np, "ti,hwmods", NULL);
	if (name)
		dev_warn(ddata->dev, "really a child ti,hwmods property?");

	return 0;
}

static int sysc_check_children(struct sysc *ddata)
{
	struct device_node *child;
	int error;

	for_each_child_of_node(ddata->dev->of_node, child) {
		error = sysc_check_one_child(ddata, child);
		if (error)
			return error;
	}

	return 0;
}

/**
 * sysc_parse_one - parses the interconnect target module registers
 * @ddata: device driver data
 * @reg: register to parse
 */
static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
{
	struct resource *res;
	const char *name;

	switch (reg) {
	case SYSC_REVISION:
	case SYSC_SYSCONFIG:
	case SYSC_SYSSTATUS:
		name = reg_names[reg];
		break;
	default:
		return -EINVAL;
	}

	res = platform_get_resource_byname(to_platform_device(ddata->dev),
					   IORESOURCE_MEM, name);
	if (!res) {
		dev_dbg(ddata->dev, "has no %s register\n", name);
		ddata->offsets[reg] = -ENODEV;

		return 0;
	}

	ddata->offsets[reg] = res->start - ddata->module_pa;

	return 0;
}

static int sysc_parse_registers(struct sysc *ddata)
{
	int i, error;

	for (i = 0; i < SYSC_MAX_REGS; i++) {
		error = sysc_parse_one(ddata, i);
		if (error)
			return error;
	}

	return 0;
}

/**
 * sysc_check_registers - check for misconfigured register overlaps
 * @ddata: device driver data
 */
static int sysc_check_registers(struct sysc *ddata)
{
	int i, j, nr_regs = 0, nr_matches = 0;

	for (i = 0; i < SYSC_MAX_REGS; i++) {
		if (ddata->offsets[i] < 0)
			continue;

		if (ddata->offsets[i] > (ddata->module_size - 4)) {
			dev_err(ddata->dev, "register outside module range");

				return -EINVAL;
		}

		for (j = 0; j < SYSC_MAX_REGS; j++) {
			if (ddata->offsets[j] < 0)
				continue;

			if (ddata->offsets[i] == ddata->offsets[j])
				nr_matches++;
		}
		nr_regs++;
	}

	if (nr_regs < 1) {
		dev_err(ddata->dev, "missing registers\n");

		return -EINVAL;
	}

	if (nr_matches > nr_regs) {
		dev_err(ddata->dev, "overlapping registers: (%i/%i)",
			nr_regs, nr_matches);

		return -EINVAL;
	}

	return 0;
}

/**
 * syc_ioremap - ioremap register space for the interconnect target module
 * @ddata: deviec driver data
 *
 * Note that the interconnect target module registers can be anywhere
 * within the first child device address space. For example, SGX has
 * them at offset 0x1fc00 in the 32MB module address space. We just
 * what we need around the interconnect target module registers.
 */
static int sysc_ioremap(struct sysc *ddata)
{
	u32 size = 0;

	if (ddata->offsets[SYSC_SYSSTATUS] >= 0)
		size = ddata->offsets[SYSC_SYSSTATUS];
	else if (ddata->offsets[SYSC_SYSCONFIG] >= 0)
		size = ddata->offsets[SYSC_SYSCONFIG];
	else if (ddata->offsets[SYSC_REVISION] >= 0)
		size = ddata->offsets[SYSC_REVISION];
	else
		return -EINVAL;

	size &= 0xfff00;
	size += SZ_256;

	ddata->module_va = devm_ioremap(ddata->dev,
					ddata->module_pa,
					size);
	if (!ddata->module_va)
		return -EIO;

	return 0;
}

/**
 * sysc_map_and_check_registers - ioremap and check device registers
 * @ddata: device driver data
 */
static int sysc_map_and_check_registers(struct sysc *ddata)
{
	int error;

	error = sysc_parse_and_check_child_range(ddata);
	if (error)
		return error;

	error = sysc_check_children(ddata);
	if (error)
		return error;

	error = sysc_parse_registers(ddata);
	if (error)
		return error;

	error = sysc_ioremap(ddata);
	if (error)
		return error;

	error = sysc_check_registers(ddata);
	if (error)
		return error;

	return 0;
}

/**
 * sysc_show_rev - read and show interconnect target module revision
 * @bufp: buffer to print the information to
 * @ddata: device driver data
 */
static int sysc_show_rev(char *bufp, struct sysc *ddata)
{
	int error, len;

	if (ddata->offsets[SYSC_REVISION] < 0)
		return sprintf(bufp, ":NA");

	error = pm_runtime_get_sync(ddata->dev);
	if (error < 0) {
		pm_runtime_put_noidle(ddata->dev);

		return 0;
	}

	len = sprintf(bufp, ":%08x", sysc_read_revision(ddata));

	pm_runtime_mark_last_busy(ddata->dev);
	pm_runtime_put_autosuspend(ddata->dev);

	return len;
}

static int sysc_show_reg(struct sysc *ddata,
			 char *bufp, enum sysc_registers reg)
{
	if (ddata->offsets[reg] < 0)
		return sprintf(bufp, ":NA");

	return sprintf(bufp, ":%x", ddata->offsets[reg]);
}

/**
 * sysc_show_registers - show information about interconnect target module
 * @ddata: device driver data
 */
static void sysc_show_registers(struct sysc *ddata)
{
	char buf[128];
	char *bufp = buf;
	int i;

	for (i = 0; i < SYSC_MAX_REGS; i++)
		bufp += sysc_show_reg(ddata, bufp, i);

	bufp += sysc_show_rev(bufp, ddata);

	dev_dbg(ddata->dev, "%llx:%x%s\n",
		ddata->module_pa, ddata->module_size,
		buf);
}

static int sysc_runtime_suspend(struct device *dev)
{
	struct sysc *ddata;
	int i;

	ddata = dev_get_drvdata(dev);

	if (ddata->legacy_mode)
		return 0;

	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
		if (IS_ERR_OR_NULL(ddata->clocks[i]))
			continue;
		clk_disable(ddata->clocks[i]);
	}

	return 0;
}

static int sysc_runtime_resume(struct device *dev)
{
	struct sysc *ddata;
	int i, error;

	ddata = dev_get_drvdata(dev);

	if (ddata->legacy_mode)
		return 0;

	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
		if (IS_ERR_OR_NULL(ddata->clocks[i]))
			continue;
		error = clk_enable(ddata->clocks[i]);
		if (error)
			return error;
	}

	return 0;
}

static const struct dev_pm_ops sysc_pm_ops = {
	SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
			   sysc_runtime_resume,
			   NULL)
};

static void sysc_unprepare(struct sysc *ddata)
{
	int i;

	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
		if (!IS_ERR_OR_NULL(ddata->clocks[i]))
			clk_unprepare(ddata->clocks[i]);
	}
}

static int sysc_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct sysc *ddata;
	int error;

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

	ddata->dev = &pdev->dev;
	ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);

	error = sysc_get_clocks(ddata);
	if (error)
		return error;

	error = sysc_map_and_check_registers(ddata);
	if (error)
		goto unprepare;

	platform_set_drvdata(pdev, ddata);

	pm_runtime_enable(ddata->dev);
	error = pm_runtime_get_sync(ddata->dev);
	if (error < 0) {
		pm_runtime_put_noidle(ddata->dev);
		pm_runtime_disable(ddata->dev);
		goto unprepare;
	}

	pm_runtime_use_autosuspend(ddata->dev);

	sysc_show_registers(ddata);

	error = of_platform_populate(ddata->dev->of_node,
				     NULL, NULL, ddata->dev);
	if (error)
		goto err;

	pm_runtime_mark_last_busy(ddata->dev);
	pm_runtime_put_autosuspend(ddata->dev);

	return 0;

err:
	pm_runtime_dont_use_autosuspend(&pdev->dev);
	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);
unprepare:
	sysc_unprepare(ddata);

	return error;
}

static const struct of_device_id sysc_match[] = {
	{ .compatible = "ti,sysc-omap2" },
	{ .compatible = "ti,sysc-omap4" },
	{ .compatible = "ti,sysc-omap4-simple" },
	{ .compatible = "ti,sysc-omap3430-sr" },
	{ .compatible = "ti,sysc-omap3630-sr" },
	{ .compatible = "ti,sysc-omap4-sr" },
	{ .compatible = "ti,sysc-omap3-sham" },
	{ .compatible = "ti,sysc-omap-aes" },
	{ .compatible = "ti,sysc-mcasp" },
	{ .compatible = "ti,sysc-usb-host-fs" },
	{  },
};
MODULE_DEVICE_TABLE(of, sysc_match);

static struct platform_driver sysc_driver = {
	.probe		= sysc_probe,
	.driver         = {
		.name   = "ti-sysc",
		.of_match_table	= sysc_match,
		.pm = &sysc_pm_ops,
	},
};
module_platform_driver(sysc_driver);

MODULE_DESCRIPTION("TI sysc interconnect target driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
0eecc636 TL	1	/*
	2	* ti-sysc.c - Texas Instruments sysc interconnect target driver
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	9	* kind, whether express or implied; without even the implied warranty
	10	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*/
	13
	14	#include <linux/io.h>
	15	#include <linux/clk.h>
	16	#include <linux/module.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/pm_runtime.h>
	19	#include <linux/of_address.h>
	20	#include <linux/of_platform.h>
	21
	22	enum sysc_registers {
	23	SYSC_REVISION,
	24	SYSC_SYSCONFIG,
	25	SYSC_SYSSTATUS,
	26	SYSC_MAX_REGS,
	27	};
	28
	29	static const char * const reg_names[] = { "rev", "sysc", "syss", };
	30
	31	enum sysc_clocks {
	32	SYSC_FCK,
	33	SYSC_ICK,
	34	SYSC_MAX_CLOCKS,
	35	};
	36
	37	static const char * const clock_names[] = { "fck", "ick", };
	38
	39	/**
	40	* struct sysc - TI sysc interconnect target module registers and capabilities
	41	* @dev: struct device pointer
	42	* @module_pa: physical address of the interconnect target module
	43	* @module_size: size of the interconnect target module
	44	* @module_va: virtual address of the interconnect target module
	45	* @offsets: register offsets from module base
	46	* @clocks: clocks used by the interconnect target module
	47	* @legacy_mode: configured for legacy mode if set
	48	*/
	49	struct sysc {
	50	struct device *dev;
	51	u64 module_pa;
	52	u32 module_size;
	53	void __iomem *module_va;
	54	int offsets[SYSC_MAX_REGS];
	55	struct clk *clocks[SYSC_MAX_CLOCKS];
	56	const char *legacy_mode;
	57	};
	58
	59	static u32 sysc_read_revision(struct sysc *ddata)
	60	{
	61	return readl_relaxed(ddata->module_va +
	62	ddata->offsets[SYSC_REVISION]);
	63	}
	64
65	static int sysc_get_one_clock(struct sysc *ddata,
66	enum sysc_clocks index)
67	{
68	const char *name;
69	int error;
70
71	switch (index) {
72	case SYSC_FCK:
73	break;
74	case SYSC_ICK:
75	break;
76	default:
77	return -EINVAL;
78	}
79	name = clock_names[index];
80
81	ddata->clocks[index] = devm_clk_get(ddata->dev, name);
82	if (IS_ERR(ddata->clocks[index])) {
83	if (PTR_ERR(ddata->clocks[index]) == -ENOENT)
84	return 0;
85
86	dev_err(ddata->dev, "clock get error for %s: %li\n",
87	name, PTR_ERR(ddata->clocks[index]));
88
89	return PTR_ERR(ddata->clocks[index]);
90	}
91
92	error = clk_prepare(ddata->clocks[index]);
93	if (error) {
94	dev_err(ddata->dev, "clock prepare error for %s: %i\n",
95	name, error);
96
97	return error;
98	}
99
100	return 0;
101	}
102
103	static int sysc_get_clocks(struct sysc *ddata)
104	{
105	int i, error;
106
107	if (ddata->legacy_mode)
108	return 0;
109
110	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
111	error = sysc_get_one_clock(ddata, i);
112	if (error && error != -ENOENT)
113	return error;
114	}
115
116	return 0;
117	}
118
119	/**
120	* sysc_parse_and_check_child_range - parses module IO region from ranges
121	* @ddata: device driver data
122	*
123	* In general we only need rev, syss, and sysc registers and not the whole
124	* module range. But we do want the offsets for these registers from the
125	* module base. This allows us to check them against the legacy hwmod
126	* platform data. Let's also check the ranges are configured properly.
127	*/
128	static int sysc_parse_and_check_child_range(struct sysc *ddata)
129	{
130	struct device_node *np = ddata->dev->of_node;
131	const __be32 *ranges;
132	u32 nr_addr, nr_size;
133	int len, error;
134
135	ranges = of_get_property(np, "ranges", &len);
136	if (!ranges) {
137	dev_err(ddata->dev, "missing ranges for %pOF\n", np);
138
139	return -ENOENT;
140	}
141
142	len /= sizeof(*ranges);
143
144	if (len < 3) {
145	dev_err(ddata->dev, "incomplete ranges for %pOF\n", np);
146
147	return -EINVAL;
148	}
149
150	error = of_property_read_u32(np, "#address-cells", &nr_addr);
151	if (error)
152	return -ENOENT;
153
154	error = of_property_read_u32(np, "#size-cells", &nr_size);
155	if (error)
156	return -ENOENT;
157
158	if (nr_addr != 1 \|\| nr_size != 1) {
159	dev_err(ddata->dev, "invalid ranges for %pOF\n", np);
160
161	return -EINVAL;
162	}
163
164	ranges++;
165	ddata->module_pa = of_translate_address(np, ranges++);
166	ddata->module_size = be32_to_cpup(ranges);
167
168	dev_dbg(ddata->dev, "interconnect target 0x%llx size 0x%x for %pOF\n",
169	ddata->module_pa, ddata->module_size, np);
170
171	return 0;
172	}
173
174	/**
175	* sysc_check_one_child - check child configuration
176	* @ddata: device driver data
177	* @np: child device node
178	*
179	* Let's avoid messy situations where we have new interconnect target
180	* node but children have "ti,hwmods". These belong to the interconnect
181	* target node and are managed by this driver.
182	*/
183	static int sysc_check_one_child(struct sysc *ddata,
184	struct device_node *np)
185	{
186	const char *name;
187
188	name = of_get_property(np, "ti,hwmods", NULL);
189	if (name)
190	dev_warn(ddata->dev, "really a child ti,hwmods property?");
191
192	return 0;
193	}
194
195	static int sysc_check_children(struct sysc *ddata)
196	{
197	struct device_node *child;
198	int error;
199
200	for_each_child_of_node(ddata->dev->of_node, child) {
201	error = sysc_check_one_child(ddata, child);
202	if (error)
203	return error;
204	}
205
206	return 0;
207	}
208
209	/**
210	* sysc_parse_one - parses the interconnect target module registers
211	* @ddata: device driver data
212	* @reg: register to parse
213	*/
214	static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg)
215	{
216	struct resource *res;
217	const char *name;
218
219	switch (reg) {
220	case SYSC_REVISION:
221	case SYSC_SYSCONFIG:
222	case SYSC_SYSSTATUS:
223	name = reg_names[reg];
224	break;
225	default:
226	return -EINVAL;
227	}
228
229	res = platform_get_resource_byname(to_platform_device(ddata->dev),
230	IORESOURCE_MEM, name);
231	if (!res) {
232	dev_dbg(ddata->dev, "has no %s register\n", name);
233	ddata->offsets[reg] = -ENODEV;
234
235	return 0;
236	}
237
238	ddata->offsets[reg] = res->start - ddata->module_pa;
239
240	return 0;
241	}
242
243	static int sysc_parse_registers(struct sysc *ddata)
244	{
245	int i, error;
246
247	for (i = 0; i < SYSC_MAX_REGS; i++) {
248	error = sysc_parse_one(ddata, i);
249	if (error)
250	return error;
251	}
252
253	return 0;
254	}
255
256	/**
257	* sysc_check_registers - check for misconfigured register overlaps
258	* @ddata: device driver data
259	*/
260	static int sysc_check_registers(struct sysc *ddata)
261	{
262	int i, j, nr_regs = 0, nr_matches = 0;
263
264	for (i = 0; i < SYSC_MAX_REGS; i++) {
265	if (ddata->offsets[i] < 0)
266	continue;
267
268	if (ddata->offsets[i] > (ddata->module_size - 4)) {
269	dev_err(ddata->dev, "register outside module range");
270
271	return -EINVAL;
272	}
273
274	for (j = 0; j < SYSC_MAX_REGS; j++) {
275	if (ddata->offsets[j] < 0)
276	continue;
277
278	if (ddata->offsets[i] == ddata->offsets[j])
279	nr_matches++;
280	}
281	nr_regs++;
282	}
283
284	if (nr_regs < 1) {
285	dev_err(ddata->dev, "missing registers\n");
286
287	return -EINVAL;
288	}
289
290	if (nr_matches > nr_regs) {
291	dev_err(ddata->dev, "overlapping registers: (%i/%i)",
292	nr_regs, nr_matches);
293
294	return -EINVAL;
295	}
296
297	return 0;
298	}
299
300	/**
301	* syc_ioremap - ioremap register space for the interconnect target module
302	* @ddata: deviec driver data
303	*
304	* Note that the interconnect target module registers can be anywhere
305	* within the first child device address space. For example, SGX has
306	* them at offset 0x1fc00 in the 32MB module address space. We just
307	* what we need around the interconnect target module registers.
308	*/
309	static int sysc_ioremap(struct sysc *ddata)
310	{
311	u32 size = 0;
312
313	if (ddata->offsets[SYSC_SYSSTATUS] >= 0)
314	size = ddata->offsets[SYSC_SYSSTATUS];
315	else if (ddata->offsets[SYSC_SYSCONFIG] >= 0)
316	size = ddata->offsets[SYSC_SYSCONFIG];
317	else if (ddata->offsets[SYSC_REVISION] >= 0)
318	size = ddata->offsets[SYSC_REVISION];
319	else
320	return -EINVAL;
321
322	size &= 0xfff00;
323	size += SZ_256;
324
325	ddata->module_va = devm_ioremap(ddata->dev,
326	ddata->module_pa,
327	size);
328	if (!ddata->module_va)
329	return -EIO;
330
331	return 0;
332	}
333
334	/**
335	* sysc_map_and_check_registers - ioremap and check device registers
336	* @ddata: device driver data
337	*/
338	static int sysc_map_and_check_registers(struct sysc *ddata)
339	{
340	int error;
341
342	error = sysc_parse_and_check_child_range(ddata);
343	if (error)
344	return error;
345
346	error = sysc_check_children(ddata);
347	if (error)
348	return error;
349
350	error = sysc_parse_registers(ddata);
351	if (error)
352	return error;
353
354	error = sysc_ioremap(ddata);
355	if (error)
356	return error;
357
358	error = sysc_check_registers(ddata);
359	if (error)
360	return error;
361
362	return 0;
363	}
364
365	/**
366	* sysc_show_rev - read and show interconnect target module revision
367	* @bufp: buffer to print the information to
368	* @ddata: device driver data
369	*/
370	static int sysc_show_rev(char bufp, struct sysc ddata)
371	{
372	int error, len;
373
374	if (ddata->offsets[SYSC_REVISION] < 0)
375	return sprintf(bufp, ":NA");
376
377	error = pm_runtime_get_sync(ddata->dev);
378	if (error < 0) {
379	pm_runtime_put_noidle(ddata->dev);
380
381	return 0;
382	}
383
384	len = sprintf(bufp, ":%08x", sysc_read_revision(ddata));
385
386	pm_runtime_mark_last_busy(ddata->dev);
387	pm_runtime_put_autosuspend(ddata->dev);
388
389	return len;
390	}
391
392	static int sysc_show_reg(struct sysc *ddata,
393	char *bufp, enum sysc_registers reg)
394	{
395	if (ddata->offsets[reg] < 0)
396	return sprintf(bufp, ":NA");
397
398	return sprintf(bufp, ":%x", ddata->offsets[reg]);
399	}
400
401	/**
402	* sysc_show_registers - show information about interconnect target module
403	* @ddata: device driver data
404	*/
405	static void sysc_show_registers(struct sysc *ddata)
406	{
407	char buf[128];
408	char *bufp = buf;
409	int i;
410
411	for (i = 0; i < SYSC_MAX_REGS; i++)
412	bufp += sysc_show_reg(ddata, bufp, i);
413
414	bufp += sysc_show_rev(bufp, ddata);
415
416	dev_dbg(ddata->dev, "%llx:%x%s\n",
417	ddata->module_pa, ddata->module_size,
418	buf);
419	}
420
421	static int sysc_runtime_suspend(struct device *dev)
422	{
423	struct sysc *ddata;
424	int i;
425
426	ddata = dev_get_drvdata(dev);
427
428	if (ddata->legacy_mode)
429	return 0;
430
431	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
432	if (IS_ERR_OR_NULL(ddata->clocks[i]))
433	continue;
434	clk_disable(ddata->clocks[i]);
435	}
436
437	return 0;
438	}
439
440	static int sysc_runtime_resume(struct device *dev)
441	{
442	struct sysc *ddata;
443	int i, error;
444
445	ddata = dev_get_drvdata(dev);
446
447	if (ddata->legacy_mode)
448	return 0;
449
450	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
451	if (IS_ERR_OR_NULL(ddata->clocks[i]))
452	continue;
453	error = clk_enable(ddata->clocks[i]);
454	if (error)
455	return error;
456	}
457
458	return 0;
459	}
460
461	static const struct dev_pm_ops sysc_pm_ops = {
462	SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
463	sysc_runtime_resume,
464	NULL)
465	};
466
467	static void sysc_unprepare(struct sysc *ddata)
468	{
469	int i;
470
471	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
472	if (!IS_ERR_OR_NULL(ddata->clocks[i]))
473	clk_unprepare(ddata->clocks[i]);
474	}
475	}
476
477	static int sysc_probe(struct platform_device *pdev)
478	{
479	struct device_node *np = pdev->dev.of_node;
480	struct sysc *ddata;
481	int error;
482
483	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
484	if (!ddata)
485	return -ENOMEM;
486
487	ddata->dev = &pdev->dev;
488	ddata->legacy_mode = of_get_property(np, "ti,hwmods", NULL);
489
490	error = sysc_get_clocks(ddata);
491	if (error)
492	return error;
493
494	error = sysc_map_and_check_registers(ddata);
495	if (error)
496	goto unprepare;
497
498	platform_set_drvdata(pdev, ddata);
499
500	pm_runtime_enable(ddata->dev);
501	error = pm_runtime_get_sync(ddata->dev);
502	if (error < 0) {
503	pm_runtime_put_noidle(ddata->dev);
504	pm_runtime_disable(ddata->dev);
505	goto unprepare;
506	}
507
508	pm_runtime_use_autosuspend(ddata->dev);
509
510	sysc_show_registers(ddata);
511
512	error = of_platform_populate(ddata->dev->of_node,
513	NULL, NULL, ddata->dev);
514	if (error)
515	goto err;
516
517	pm_runtime_mark_last_busy(ddata->dev);
518	pm_runtime_put_autosuspend(ddata->dev);
519
520	return 0;
521
522	err:
523	pm_runtime_dont_use_autosuspend(&pdev->dev);
524	pm_runtime_put_sync(&pdev->dev);
525	pm_runtime_disable(&pdev->dev);
526	unprepare:
527	sysc_unprepare(ddata);
528
529	return error;
530	}
531
532	static const struct of_device_id sysc_match[] = {
533	{ .compatible = "ti,sysc-omap2" },
534	{ .compatible = "ti,sysc-omap4" },
535	{ .compatible = "ti,sysc-omap4-simple" },
536	{ .compatible = "ti,sysc-omap3430-sr" },
537	{ .compatible = "ti,sysc-omap3630-sr" },
538	{ .compatible = "ti,sysc-omap4-sr" },
539	{ .compatible = "ti,sysc-omap3-sham" },
540	{ .compatible = "ti,sysc-omap-aes" },
541	{ .compatible = "ti,sysc-mcasp" },
542	{ .compatible = "ti,sysc-usb-host-fs" },
543	{ },
544	};
545	MODULE_DEVICE_TABLE(of, sysc_match);
546
547	static struct platform_driver sysc_driver = {
548	.probe = sysc_probe,
549	.driver = {
550	.name = "ti-sysc",
551	.of_match_table = sysc_match,
552	.pm = &sysc_pm_ops,
553	},
554	};
555	module_platform_driver(sysc_driver);
556
557	MODULE_DESCRIPTION("TI sysc interconnect target driver");
558	MODULE_LICENSE("GPL v2");