[mirror_ubuntu-artful-kernel.git] / drivers / clk / clk-clps711x.c

/*
 *  Cirrus Logic CLPS711X CLK driver
 *
 *  Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/mfd/syscon/clps711x.h>

#include <dt-bindings/clock/clps711x-clock.h>

#define CLPS711X_SYSCON1	(0x0100)
#define CLPS711X_SYSCON2	(0x1100)
#define CLPS711X_SYSFLG2	(CLPS711X_SYSCON2 + SYSFLG_OFFSET)
#define CLPS711X_PLLR		(0xa5a8)

#define CLPS711X_EXT_FREQ	(13000000)
#define CLPS711X_OSC_FREQ	(3686400)

static const struct clk_div_table spi_div_table[] = {
	{ .val = 0, .div = 32, },
	{ .val = 1, .div = 8, },
	{ .val = 2, .div = 2, },
	{ .val = 3, .div = 1, },
};

static const struct clk_div_table timer_div_table[] = {
	{ .val = 0, .div = 256, },
	{ .val = 1, .div = 1, },
};

struct clps711x_clk {
	struct clk_onecell_data	clk_data;
	spinlock_t		lock;
	struct clk		*clks[CLPS711X_CLK_MAX];
};

static struct clps711x_clk * __init _clps711x_clk_init(void __iomem *base,
						       u32 fref)
{
	u32 tmp, f_cpu, f_pll, f_bus, f_tim, f_pwm, f_spi;
	struct clps711x_clk *clps711x_clk;
	unsigned i;

	if (!base)
		return ERR_PTR(-ENOMEM);

	clps711x_clk = kzalloc(sizeof(*clps711x_clk), GFP_KERNEL);
	if (!clps711x_clk)
		return ERR_PTR(-ENOMEM);

	spin_lock_init(&clps711x_clk->lock);

	/* Read PLL multiplier value and sanity check */
	tmp = readl(base + CLPS711X_PLLR) >> 24;
	if (((tmp >= 10) && (tmp <= 50)) || !fref)
		f_pll = DIV_ROUND_UP(CLPS711X_OSC_FREQ * tmp, 2);
	else
		f_pll = fref;

	tmp = readl(base + CLPS711X_SYSFLG2);
	if (tmp & SYSFLG2_CKMODE) {
		f_cpu = CLPS711X_EXT_FREQ;
		f_bus = CLPS711X_EXT_FREQ;
		f_spi = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 96);
		f_pll = 0;
		f_pwm = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 128);
	} else {
		f_cpu = f_pll;
		if (f_cpu > 36864000)
			f_bus = DIV_ROUND_UP(f_cpu, 2);
		else
			f_bus = 36864000 / 2;
		f_spi = DIV_ROUND_CLOSEST(f_cpu, 576);
		f_pwm = DIV_ROUND_CLOSEST(f_cpu, 768);
	}

	if (tmp & SYSFLG2_CKMODE) {
		if (readl(base + CLPS711X_SYSCON2) & SYSCON2_OSTB)
			f_tim = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 26);
		else
			f_tim = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 24);
	} else
		f_tim = DIV_ROUND_CLOSEST(f_cpu, 144);

	tmp = readl(base + CLPS711X_SYSCON1);
	/* Timer1 in free running mode.
	 * Counter will wrap around to 0xffff when it underflows
	 * and will continue to count down.
	 */
	tmp &= ~(SYSCON1_TC1M | SYSCON1_TC1S);
	/* Timer2 in prescale mode.
	 * Value writen is automatically re-loaded when
	 * the counter underflows.
	 */
	tmp |= SYSCON1_TC2M | SYSCON1_TC2S;
	writel(tmp, base + CLPS711X_SYSCON1);

	clps711x_clk->clks[CLPS711X_CLK_DUMMY] =
		clk_register_fixed_rate(NULL, "dummy", NULL, CLK_IS_ROOT, 0);
	clps711x_clk->clks[CLPS711X_CLK_CPU] =
		clk_register_fixed_rate(NULL, "cpu", NULL, CLK_IS_ROOT, f_cpu);
	clps711x_clk->clks[CLPS711X_CLK_BUS] =
		clk_register_fixed_rate(NULL, "bus", NULL, CLK_IS_ROOT, f_bus);
	clps711x_clk->clks[CLPS711X_CLK_PLL] =
		clk_register_fixed_rate(NULL, "pll", NULL, CLK_IS_ROOT, f_pll);
	clps711x_clk->clks[CLPS711X_CLK_TIMERREF] =
		clk_register_fixed_rate(NULL, "timer_ref", NULL, CLK_IS_ROOT,
					f_tim);
	clps711x_clk->clks[CLPS711X_CLK_TIMER1] =
		clk_register_divider_table(NULL, "timer1", "timer_ref", 0,
					   base + CLPS711X_SYSCON1, 5, 1, 0,
					   timer_div_table, &clps711x_clk->lock);
	clps711x_clk->clks[CLPS711X_CLK_TIMER2] =
		clk_register_divider_table(NULL, "timer2", "timer_ref", 0,
					   base + CLPS711X_SYSCON1, 7, 1, 0,
					   timer_div_table, &clps711x_clk->lock);
	clps711x_clk->clks[CLPS711X_CLK_PWM] =
		clk_register_fixed_rate(NULL, "pwm", NULL, CLK_IS_ROOT, f_pwm);
	clps711x_clk->clks[CLPS711X_CLK_SPIREF] =
		clk_register_fixed_rate(NULL, "spi_ref", NULL, CLK_IS_ROOT,
					f_spi);
	clps711x_clk->clks[CLPS711X_CLK_SPI] =
		clk_register_divider_table(NULL, "spi", "spi_ref", 0,
					   base + CLPS711X_SYSCON1, 16, 2, 0,
					   spi_div_table, &clps711x_clk->lock);
	clps711x_clk->clks[CLPS711X_CLK_UART] =
		clk_register_fixed_factor(NULL, "uart", "bus", 0, 1, 10);
	clps711x_clk->clks[CLPS711X_CLK_TICK] =
		clk_register_fixed_rate(NULL, "tick", NULL, CLK_IS_ROOT, 64);

	for (i = 0; i < CLPS711X_CLK_MAX; i++)
		if (IS_ERR(clps711x_clk->clks[i]))
			pr_err("clk %i: register failed with %ld\n",
			       i, PTR_ERR(clps711x_clk->clks[i]));

	return clps711x_clk;
}

void __init clps711x_clk_init(void __iomem *base)
{
	struct clps711x_clk *clps711x_clk;

	clps711x_clk = _clps711x_clk_init(base, 73728000);

	BUG_ON(IS_ERR(clps711x_clk));

	/* Clocksource */
	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_TIMER1],
			    NULL, "clps711x-timer.0");
	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_TIMER2],
			    NULL, "clps711x-timer.1");

	/* Drivers */
	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_PWM],
			    NULL, "clps711x-pwm");
	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_UART],
			    NULL, "clps711x-uart.0");
	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_UART],
			    NULL, "clps711x-uart.1");
}

#ifdef CONFIG_OF
static void __init clps711x_clk_init_dt(struct device_node *np)
{
	void __iomem *base = of_iomap(np, 0);
	struct clps711x_clk *clps711x_clk;
	u32 fref = 0;

	WARN_ON(of_property_read_u32(np, "startup-frequency", &fref));

	clps711x_clk = _clps711x_clk_init(base, fref);
	BUG_ON(IS_ERR(clps711x_clk));

	clps711x_clk->clk_data.clks = clps711x_clk->clks;
	clps711x_clk->clk_data.clk_num = CLPS711X_CLK_MAX;
	of_clk_add_provider(np, of_clk_src_onecell_get,
			    &clps711x_clk->clk_data);
}
CLK_OF_DECLARE(clps711x, "cirrus,clps711x-clk", clps711x_clk_init_dt);
#endif
Commit	Line	Data
631c5347 AS	1	/*
	2	* Cirrus Logic CLPS711X CLK driver
	3	*
	4	* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
631c5347 AS	12	#include <linux/clk-provider.h>
	13	#include <linux/clkdev.h>
	14	#include <linux/io.h>
	15	#include <linux/ioport.h>
	16	#include <linux/of_address.h>
	17	#include <linux/slab.h>
	18	#include <linux/mfd/syscon/clps711x.h>
	19
	20	#include <dt-bindings/clock/clps711x-clock.h>
	21
	22	#define CLPS711X_SYSCON1 (0x0100)
	23	#define CLPS711X_SYSCON2 (0x1100)
	24	#define CLPS711X_SYSFLG2 (CLPS711X_SYSCON2 + SYSFLG_OFFSET)
	25	#define CLPS711X_PLLR (0xa5a8)
	26
	27	#define CLPS711X_EXT_FREQ (13000000)
	28	#define CLPS711X_OSC_FREQ (3686400)
	29
	30	static const struct clk_div_table spi_div_table[] = {
	31	{ .val = 0, .div = 32, },
	32	{ .val = 1, .div = 8, },
	33	{ .val = 2, .div = 2, },
	34	{ .val = 3, .div = 1, },
	35	};
	36
	37	static const struct clk_div_table timer_div_table[] = {
	38	{ .val = 0, .div = 256, },
	39	{ .val = 1, .div = 1, },
	40	};
	41
	42	struct clps711x_clk {
	43	struct clk_onecell_data clk_data;
	44	spinlock_t lock;
	45	struct clk *clks[CLPS711X_CLK_MAX];
	46	};
	47
	48	static struct clps711x_clk * __init _clps711x_clk_init(void __iomem *base,
	49	u32 fref)
	50	{
	51	u32 tmp, f_cpu, f_pll, f_bus, f_tim, f_pwm, f_spi;
	52	struct clps711x_clk *clps711x_clk;
	53	unsigned i;
	54
	55	if (!base)
	56	return ERR_PTR(-ENOMEM);
	57
	58	clps711x_clk = kzalloc(sizeof(*clps711x_clk), GFP_KERNEL);
	59	if (!clps711x_clk)
	60	return ERR_PTR(-ENOMEM);
	61
	62	spin_lock_init(&clps711x_clk->lock);
	63
	64	/* Read PLL multiplier value and sanity check */
	65	tmp = readl(base + CLPS711X_PLLR) >> 24;
	66	if (((tmp >= 10) && (tmp <= 50)) \|\| !fref)
	67	f_pll = DIV_ROUND_UP(CLPS711X_OSC_FREQ * tmp, 2);
	68	else
	69	f_pll = fref;
	70
	71	tmp = readl(base + CLPS711X_SYSFLG2);
	72	if (tmp & SYSFLG2_CKMODE) {
	73	f_cpu = CLPS711X_EXT_FREQ;
	74	f_bus = CLPS711X_EXT_FREQ;
	75	f_spi = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 96);
76	f_pll = 0;
77	f_pwm = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 128);
78	} else {
79	f_cpu = f_pll;
80	if (f_cpu > 36864000)
81	f_bus = DIV_ROUND_UP(f_cpu, 2);
82	else
83	f_bus = 36864000 / 2;
84	f_spi = DIV_ROUND_CLOSEST(f_cpu, 576);
85	f_pwm = DIV_ROUND_CLOSEST(f_cpu, 768);
86	}
87
88	if (tmp & SYSFLG2_CKMODE) {
89	if (readl(base + CLPS711X_SYSCON2) & SYSCON2_OSTB)
90	f_tim = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 26);
91	else
92	f_tim = DIV_ROUND_CLOSEST(CLPS711X_EXT_FREQ, 24);
93	} else
94	f_tim = DIV_ROUND_CLOSEST(f_cpu, 144);
95
96	tmp = readl(base + CLPS711X_SYSCON1);
97	/* Timer1 in free running mode.
98	* Counter will wrap around to 0xffff when it underflows
99	* and will continue to count down.
100	*/
101	tmp &= ~(SYSCON1_TC1M \| SYSCON1_TC1S);
102	/* Timer2 in prescale mode.
103	* Value writen is automatically re-loaded when
104	* the counter underflows.
105	*/
106	tmp \|= SYSCON1_TC2M \| SYSCON1_TC2S;
107	writel(tmp, base + CLPS711X_SYSCON1);
108
109	clps711x_clk->clks[CLPS711X_CLK_DUMMY] =
110	clk_register_fixed_rate(NULL, "dummy", NULL, CLK_IS_ROOT, 0);
111	clps711x_clk->clks[CLPS711X_CLK_CPU] =
112	clk_register_fixed_rate(NULL, "cpu", NULL, CLK_IS_ROOT, f_cpu);
113	clps711x_clk->clks[CLPS711X_CLK_BUS] =
114	clk_register_fixed_rate(NULL, "bus", NULL, CLK_IS_ROOT, f_bus);
115	clps711x_clk->clks[CLPS711X_CLK_PLL] =
116	clk_register_fixed_rate(NULL, "pll", NULL, CLK_IS_ROOT, f_pll);
117	clps711x_clk->clks[CLPS711X_CLK_TIMERREF] =
118	clk_register_fixed_rate(NULL, "timer_ref", NULL, CLK_IS_ROOT,
119	f_tim);
120	clps711x_clk->clks[CLPS711X_CLK_TIMER1] =
121	clk_register_divider_table(NULL, "timer1", "timer_ref", 0,
122	base + CLPS711X_SYSCON1, 5, 1, 0,
123	timer_div_table, &clps711x_clk->lock);
124	clps711x_clk->clks[CLPS711X_CLK_TIMER2] =
125	clk_register_divider_table(NULL, "timer2", "timer_ref", 0,
126	base + CLPS711X_SYSCON1, 7, 1, 0,
127	timer_div_table, &clps711x_clk->lock);
128	clps711x_clk->clks[CLPS711X_CLK_PWM] =
129	clk_register_fixed_rate(NULL, "pwm", NULL, CLK_IS_ROOT, f_pwm);
130	clps711x_clk->clks[CLPS711X_CLK_SPIREF] =
131	clk_register_fixed_rate(NULL, "spi_ref", NULL, CLK_IS_ROOT,
132	f_spi);
133	clps711x_clk->clks[CLPS711X_CLK_SPI] =
134	clk_register_divider_table(NULL, "spi", "spi_ref", 0,
135	base + CLPS711X_SYSCON1, 16, 2, 0,
136	spi_div_table, &clps711x_clk->lock);
137	clps711x_clk->clks[CLPS711X_CLK_UART] =
138	clk_register_fixed_factor(NULL, "uart", "bus", 0, 1, 10);
139	clps711x_clk->clks[CLPS711X_CLK_TICK] =
140	clk_register_fixed_rate(NULL, "tick", NULL, CLK_IS_ROOT, 64);
141
142	for (i = 0; i < CLPS711X_CLK_MAX; i++)
143	if (IS_ERR(clps711x_clk->clks[i]))
144	pr_err("clk %i: register failed with %ld\n",
145	i, PTR_ERR(clps711x_clk->clks[i]));
146
147	return clps711x_clk;
148	}
149
150	void __init clps711x_clk_init(void __iomem *base)
151	{
152	struct clps711x_clk *clps711x_clk;
153
154	clps711x_clk = _clps711x_clk_init(base, 73728000);
155
156	BUG_ON(IS_ERR(clps711x_clk));
157
158	/* Clocksource */
159	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_TIMER1],
160	NULL, "clps711x-timer.0");
161	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_TIMER2],
162	NULL, "clps711x-timer.1");
163
164	/* Drivers */
165	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_PWM],
166	NULL, "clps711x-pwm");
167	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_UART],
168	NULL, "clps711x-uart.0");
169	clk_register_clkdev(clps711x_clk->clks[CLPS711X_CLK_UART],
170	NULL, "clps711x-uart.1");
171	}
172
173	#ifdef CONFIG_OF
174	static void __init clps711x_clk_init_dt(struct device_node *np)
175	{
176	void __iomem *base = of_iomap(np, 0);
177	struct clps711x_clk *clps711x_clk;
178	u32 fref = 0;
179
180	WARN_ON(of_property_read_u32(np, "startup-frequency", &fref));
181
182	clps711x_clk = _clps711x_clk_init(base, fref);
183	BUG_ON(IS_ERR(clps711x_clk));
184
185	clps711x_clk->clk_data.clks = clps711x_clk->clks;
186	clps711x_clk->clk_data.clk_num = CLPS711X_CLK_MAX;
187	of_clk_add_provider(np, of_clk_src_onecell_get,
188	&clps711x_clk->clk_data);
189	}
190	CLK_OF_DECLARE(clps711x, "cirrus,clps711x-clk", clps711x_clk_init_dt);
191	#endif