summaryrefslogtreecommitdiff
path: root/drivers/clk/samsung/clk-s3c2412.c
blob: ce21b89d1eb194e20917aa7fb5e524e9a304b1de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
/*
 * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de>
 *
 * 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.
 *
 * Common Clock Framework support for S3C2412 and S3C2413.
 */

#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/reboot.h>

#include <dt-bindings/clock/s3c2412.h>

#include "clk.h"
#include "clk-pll.h"

#define LOCKTIME	0x00
#define MPLLCON		0x04
#define UPLLCON		0x08
#define CLKCON		0x0c
#define CLKDIVN		0x14
#define CLKSRC		0x1c
#define SWRST		0x30

static void __iomem *reg_base;

/*
 * list of controller registers to be saved and restored during a
 * suspend/resume cycle.
 */
static unsigned long s3c2412_clk_regs[] __initdata = {
	LOCKTIME,
	MPLLCON,
	UPLLCON,
	CLKCON,
	CLKDIVN,
	CLKSRC,
};

static struct clk_div_table divxti_d[] = {
	{ .val = 0, .div = 1 },
	{ .val = 1, .div = 2 },
	{ .val = 2, .div = 4 },
	{ .val = 3, .div = 6 },
	{ .val = 4, .div = 8 },
	{ .val = 5, .div = 10 },
	{ .val = 6, .div = 12 },
	{ .val = 7, .div = 14 },
	{ /* sentinel */ },
};

static struct samsung_div_clock s3c2412_dividers[] __initdata = {
	DIV_T(0, "div_xti", "xti", CLKSRC, 0, 3, divxti_d),
	DIV(0, "div_cam", "mux_cam", CLKDIVN, 16, 4),
	DIV(0, "div_i2s", "mux_i2s", CLKDIVN, 12, 4),
	DIV(0, "div_uart", "mux_uart", CLKDIVN, 8, 4),
	DIV(0, "div_usb", "mux_usb", CLKDIVN, 6, 1),
	DIV(0, "div_hclk_half", "hclk", CLKDIVN, 5, 1),
	DIV(ARMDIV, "armdiv", "msysclk", CLKDIVN, 3, 1),
	DIV(PCLK, "pclk", "hclk", CLKDIVN, 2, 1),
	DIV(HCLK, "hclk", "armdiv", CLKDIVN, 0, 2),
};

static struct samsung_fixed_factor_clock s3c2412_ffactor[] __initdata = {
	FFACTOR(0, "ff_hclk", "hclk", 2, 1, CLK_SET_RATE_PARENT),
};

/*
 * The first two use the OM[4] setting, which is not readable from
 * software, so assume it is set to xti.
 */
PNAME(erefclk_p) = { "xti", "xti", "xti", "ext" };
PNAME(urefclk_p) = { "xti", "xti", "xti", "ext" };

PNAME(camclk_p) = { "usysclk", "hclk" };
PNAME(usbclk_p) = { "usysclk", "hclk" };
PNAME(i2sclk_p) = { "erefclk", "mpll" };
PNAME(uartclk_p) = { "erefclk", "mpll" };
PNAME(usysclk_p) = { "urefclk", "upll" };
PNAME(msysclk_p) = { "mdivclk", "mpll" };
PNAME(mdivclk_p) = { "xti", "div_xti" };
PNAME(armclk_p) = { "armdiv", "hclk" };

static struct samsung_mux_clock s3c2412_muxes[] __initdata = {
	MUX(0, "erefclk", erefclk_p, CLKSRC, 14, 2),
	MUX(0, "urefclk", urefclk_p, CLKSRC, 12, 2),
	MUX(0, "mux_cam", camclk_p, CLKSRC, 11, 1),
	MUX(0, "mux_usb", usbclk_p, CLKSRC, 10, 1),
	MUX(0, "mux_i2s", i2sclk_p, CLKSRC, 9, 1),
	MUX(0, "mux_uart", uartclk_p, CLKSRC, 8, 1),
	MUX(USYSCLK, "usysclk", usysclk_p, CLKSRC, 5, 1),
	MUX(MSYSCLK, "msysclk", msysclk_p, CLKSRC, 4, 1),
	MUX(MDIVCLK, "mdivclk", mdivclk_p, CLKSRC, 3, 1),
	MUX(ARMCLK, "armclk", armclk_p, CLKDIVN, 4, 1),
};

static struct samsung_pll_clock s3c2412_plls[] __initdata = {
	PLL(pll_s3c2440_mpll, MPLL, "mpll", "xti", LOCKTIME, MPLLCON, NULL),
	PLL(pll_s3c2410_upll, UPLL, "upll", "urefclk", LOCKTIME, UPLLCON, NULL),
};

static struct samsung_gate_clock s3c2412_gates[] __initdata = {
	GATE(PCLK_WDT, "wdt", "pclk", CLKCON, 28, 0, 0),
	GATE(PCLK_SPI, "spi", "pclk", CLKCON, 27, 0, 0),
	GATE(PCLK_I2S, "i2s", "pclk", CLKCON, 26, 0, 0),
	GATE(PCLK_I2C, "i2c", "pclk", CLKCON, 25, 0, 0),
	GATE(PCLK_ADC, "adc", "pclk", CLKCON, 24, 0, 0),
	GATE(PCLK_RTC, "rtc", "pclk", CLKCON, 23, 0, 0),
	GATE(PCLK_GPIO, "gpio", "pclk", CLKCON, 22, CLK_IGNORE_UNUSED, 0),
	GATE(PCLK_UART2, "uart2", "pclk", CLKCON, 21, 0, 0),
	GATE(PCLK_UART1, "uart1", "pclk", CLKCON, 20, 0, 0),
	GATE(PCLK_UART0, "uart0", "pclk", CLKCON, 19, 0, 0),
	GATE(PCLK_SDI, "sdi", "pclk", CLKCON, 18, 0, 0),
	GATE(PCLK_PWM, "pwm", "pclk", CLKCON, 17, 0, 0),
	GATE(PCLK_USBD, "usb-device", "pclk", CLKCON, 16, 0, 0),
	GATE(SCLK_CAM, "sclk_cam", "div_cam", CLKCON, 15, 0, 0),
	GATE(SCLK_UART, "sclk_uart", "div_uart", CLKCON, 14, 0, 0),
	GATE(SCLK_I2S, "sclk_i2s", "div_i2s", CLKCON, 13, 0, 0),
	GATE(SCLK_USBH, "sclk_usbh", "div_usb", CLKCON, 12, 0, 0),
	GATE(SCLK_USBD, "sclk_usbd", "div_usb", CLKCON, 11, 0, 0),
	GATE(HCLK_HALF, "hclk_half", "div_hclk_half", CLKCON, 10, CLK_IGNORE_UNUSED, 0),
	GATE(HCLK_X2, "hclkx2", "ff_hclk", CLKCON, 9, CLK_IGNORE_UNUSED, 0),
	GATE(HCLK_SDRAM, "sdram", "hclk", CLKCON, 8, CLK_IGNORE_UNUSED, 0),
	GATE(HCLK_USBH, "usb-host", "hclk", CLKCON, 6, 0, 0),
	GATE(HCLK_LCD, "lcd", "hclk", CLKCON, 5, 0, 0),
	GATE(HCLK_NAND, "nand", "hclk", CLKCON, 4, 0, 0),
	GATE(HCLK_DMA3, "dma3", "hclk", CLKCON, 3, CLK_IGNORE_UNUSED, 0),
	GATE(HCLK_DMA2, "dma2", "hclk", CLKCON, 2, CLK_IGNORE_UNUSED, 0),
	GATE(HCLK_DMA1, "dma1", "hclk", CLKCON, 1, CLK_IGNORE_UNUSED, 0),
	GATE(HCLK_DMA0, "dma0", "hclk", CLKCON, 0, CLK_IGNORE_UNUSED, 0),
};

static struct samsung_clock_alias s3c2412_aliases[] __initdata = {
	ALIAS(PCLK_UART0, "s3c2412-uart.0", "uart"),
	ALIAS(PCLK_UART1, "s3c2412-uart.1", "uart"),
	ALIAS(PCLK_UART2, "s3c2412-uart.2", "uart"),
	ALIAS(PCLK_UART0, "s3c2412-uart.0", "clk_uart_baud2"),
	ALIAS(PCLK_UART1, "s3c2412-uart.1", "clk_uart_baud2"),
	ALIAS(PCLK_UART2, "s3c2412-uart.2", "clk_uart_baud2"),
	ALIAS(SCLK_UART, NULL, "clk_uart_baud3"),
	ALIAS(PCLK_I2C, "s3c2410-i2c.0", "i2c"),
	ALIAS(PCLK_ADC, NULL, "adc"),
	ALIAS(PCLK_RTC, NULL, "rtc"),
	ALIAS(PCLK_PWM, NULL, "timers"),
	ALIAS(HCLK_LCD, NULL, "lcd"),
	ALIAS(PCLK_USBD, NULL, "usb-device"),
	ALIAS(SCLK_USBD, NULL, "usb-bus-gadget"),
	ALIAS(HCLK_USBH, NULL, "usb-host"),
	ALIAS(SCLK_USBH, NULL, "usb-bus-host"),
	ALIAS(ARMCLK, NULL, "armclk"),
	ALIAS(HCLK, NULL, "hclk"),
	ALIAS(MPLL, NULL, "mpll"),
	ALIAS(MSYSCLK, NULL, "fclk"),
};

static int s3c2412_restart(struct notifier_block *this,
			   unsigned long mode, void *cmd)
{
	/* errata "Watch-dog/Software Reset Problem" specifies that
	 * this reset must be done with the SYSCLK sourced from
	 * EXTCLK instead of FOUT to avoid a glitch in the reset
	 * mechanism.
	 *
	 * See the watchdog section of the S3C2412 manual for more
	 * information on this fix.
	 */

	__raw_writel(0x00, reg_base + CLKSRC);
	__raw_writel(0x533C2412, reg_base + SWRST);
	return NOTIFY_DONE;
}

static struct notifier_block s3c2412_restart_handler = {
	.notifier_call = s3c2412_restart,
	.priority = 129,
};

/*
 * fixed rate clocks generated outside the soc
 * Only necessary until the devicetree-move is complete
 */
#define XTI	1
static struct samsung_fixed_rate_clock s3c2412_common_frate_clks[] __initdata = {
	FRATE(XTI, "xti", NULL, 0, 0),
	FRATE(0, "ext", NULL, 0, 0),
};

static void __init s3c2412_common_clk_register_fixed_ext(
		struct samsung_clk_provider *ctx,
		unsigned long xti_f, unsigned long ext_f)
{
	/* xtal alias is necessary for the current cpufreq driver */
	struct samsung_clock_alias xti_alias = ALIAS(XTI, NULL, "xtal");

	s3c2412_common_frate_clks[0].fixed_rate = xti_f;
	s3c2412_common_frate_clks[1].fixed_rate = ext_f;
	samsung_clk_register_fixed_rate(ctx, s3c2412_common_frate_clks,
				ARRAY_SIZE(s3c2412_common_frate_clks));

	samsung_clk_register_alias(ctx, &xti_alias, 1);
}

void __init s3c2412_common_clk_init(struct device_node *np, unsigned long xti_f,
				    unsigned long ext_f, void __iomem *base)
{
	struct samsung_clk_provider *ctx;
	int ret;
	reg_base = base;

	if (np) {
		reg_base = of_iomap(np, 0);
		if (!reg_base)
			panic("%s: failed to map registers\n", __func__);
	}

	ctx = samsung_clk_init(np, reg_base, NR_CLKS);

	/* Register external clocks only in non-dt cases */
	if (!np)
		s3c2412_common_clk_register_fixed_ext(ctx, xti_f, ext_f);

	/* Register PLLs. */
	samsung_clk_register_pll(ctx, s3c2412_plls, ARRAY_SIZE(s3c2412_plls),
				 reg_base);

	/* Register common internal clocks. */
	samsung_clk_register_mux(ctx, s3c2412_muxes, ARRAY_SIZE(s3c2412_muxes));
	samsung_clk_register_div(ctx, s3c2412_dividers,
					  ARRAY_SIZE(s3c2412_dividers));
	samsung_clk_register_gate(ctx, s3c2412_gates,
					ARRAY_SIZE(s3c2412_gates));
	samsung_clk_register_fixed_factor(ctx, s3c2412_ffactor,
					  ARRAY_SIZE(s3c2412_ffactor));
	samsung_clk_register_alias(ctx, s3c2412_aliases,
				   ARRAY_SIZE(s3c2412_aliases));

	samsung_clk_sleep_init(reg_base, s3c2412_clk_regs,
			       ARRAY_SIZE(s3c2412_clk_regs));

	samsung_clk_of_add_provider(np, ctx);

	ret = register_restart_handler(&s3c2412_restart_handler);
	if (ret)
		pr_warn("cannot register restart handler, %d\n", ret);
}

static void __init s3c2412_clk_init(struct device_node *np)
{
	s3c2412_common_clk_init(np, 0, 0, NULL);
}
CLK_OF_DECLARE(s3c2412_clk, "samsung,s3c2412-clock", s3c2412_clk_init);