aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-mx25/clock.c
blob: ef26951a527564c81eccc57b2f98dd0047d51bdf (plain) (blame)
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
/*
 * Copyright (C) 2009 by Sascha Hauer, Pengutronix
 *
 * 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.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <asm/clkdev.h>

#include <mach/clock.h>
#include <mach/hardware.h>
#include <mach/common.h>
#include <mach/mx25.h>

#define CRM_BASE	MX25_IO_ADDRESS(MX25_CRM_BASE_ADDR)

#define CCM_MPCTL	0x00
#define CCM_UPCTL	0x04
#define CCM_CCTL	0x08
#define CCM_CGCR0	0x0C
#define CCM_CGCR1	0x10
#define CCM_CGCR2	0x14
#define CCM_PCDR0	0x18
#define CCM_PCDR1	0x1C
#define CCM_PCDR2	0x20
#define CCM_PCDR3	0x24
#define CCM_RCSR	0x28
#define CCM_CRDR	0x2C
#define CCM_DCVR0	0x30
#define CCM_DCVR1	0x34
#define CCM_DCVR2	0x38
#define CCM_DCVR3	0x3c
#define CCM_LTR0	0x40
#define CCM_LTR1	0x44
#define CCM_LTR2	0x48
#define CCM_LTR3	0x4c

static unsigned long get_rate_mpll(void)
{
	ulong mpctl = __raw_readl(CRM_BASE + CCM_MPCTL);

	return mxc_decode_pll(mpctl, 24000000);
}

static unsigned long get_rate_upll(void)
{
	ulong mpctl = __raw_readl(CRM_BASE + CCM_UPCTL);

	return mxc_decode_pll(mpctl, 24000000);
}

unsigned long get_rate_arm(struct clk *clk)
{
	unsigned long cctl = readl(CRM_BASE + CCM_CCTL);
	unsigned long rate = get_rate_mpll();

	if (cctl & (1 << 14))
		rate = (rate * 3) >> 1;

	return rate / ((cctl >> 30) + 1);
}

static unsigned long get_rate_ahb(struct clk *clk)
{
	unsigned long cctl = readl(CRM_BASE + CCM_CCTL);

	return get_rate_arm(NULL) / (((cctl >> 28) & 0x3) + 1);
}

static unsigned long get_rate_ipg(struct clk *clk)
{
	return get_rate_ahb(NULL) >> 1;
}

static unsigned long get_rate_per(int per)
{
	unsigned long ofs = (per & 0x3) * 8;
	unsigned long reg = per & ~0x3;
	unsigned long val = (readl(CRM_BASE + CCM_PCDR0 + reg) >> ofs) & 0x3f;
	unsigned long fref;

	if (readl(CRM_BASE + 0x64) & (1 << per))
		fref = get_rate_upll();
	else
		fref = get_rate_ipg(NULL);

	return fref / (val + 1);
}

static unsigned long get_rate_uart(struct clk *clk)
{
	return get_rate_per(15);
}

static unsigned long get_rate_i2c(struct clk *clk)
{
	return get_rate_per(6);
}

static unsigned long get_rate_nfc(struct clk *clk)
{
	return get_rate_per(8);
}

static unsigned long get_rate_otg(struct clk *clk)
{
	return 48000000; /* FIXME */
}

static int clk_cgcr_enable(struct clk *clk)
{
	u32 reg;

	reg = __raw_readl(clk->enable_reg);
	reg |= 1 << clk->enable_shift;
	__raw_writel(reg, clk->enable_reg);

	return 0;
}

static void clk_cgcr_disable(struct clk *clk)
{
	u32 reg;

	reg = __raw_readl(clk->enable_reg);
	reg &= ~(1 << clk->enable_shift);
	__raw_writel(reg, clk->enable_reg);
}

#define DEFINE_CLOCK(name, i, er, es, gr, sr)		\
	static struct clk name = {			\
		.id		= i,			\
		.enable_reg	= CRM_BASE + er,	\
		.enable_shift	= es,			\
		.get_rate	= gr,			\
		.set_rate	= sr,			\
		.enable		= clk_cgcr_enable,	\
		.disable	= clk_cgcr_disable,	\
	}

DEFINE_CLOCK(gpt_clk,    0, CCM_CGCR0,  5, get_rate_ipg, NULL);
DEFINE_CLOCK(cspi1_clk,  0, CCM_CGCR1,  5, get_rate_ipg, NULL);
DEFINE_CLOCK(cspi2_clk,  0, CCM_CGCR1,  6, get_rate_ipg, NULL);
DEFINE_CLOCK(cspi3_clk,  0, CCM_CGCR1,  7, get_rate_ipg, NULL);
DEFINE_CLOCK(uart1_clk,  0, CCM_CGCR2, 14, get_rate_uart, NULL);
DEFINE_CLOCK(uart2_clk,  0, CCM_CGCR2, 15, get_rate_uart, NULL);
DEFINE_CLOCK(uart3_clk,  0, CCM_CGCR2, 16, get_rate_uart, NULL);
DEFINE_CLOCK(uart4_clk,  0, CCM_CGCR2, 17, get_rate_uart, NULL);
DEFINE_CLOCK(uart5_clk,  0, CCM_CGCR2, 18, get_rate_uart, NULL);
DEFINE_CLOCK(nfc_clk,    0, CCM_CGCR0,  8, get_rate_nfc, NULL);
DEFINE_CLOCK(usbotg_clk, 0, CCM_CGCR0, 28, get_rate_otg, NULL);
DEFINE_CLOCK(pwm1_clk,	 0, CCM_CGCR1, 31, get_rate_ipg, NULL);
DEFINE_CLOCK(pwm2_clk,	 0, CCM_CGCR2,  0, get_rate_ipg, NULL);
DEFINE_CLOCK(pwm3_clk,	 0, CCM_CGCR2,  1, get_rate_ipg, NULL);
DEFINE_CLOCK(pwm4_clk,	 0, CCM_CGCR2,  2, get_rate_ipg, NULL);
DEFINE_CLOCK(kpp_clk,	 0, CCM_CGCR1, 28, get_rate_ipg, NULL);
DEFINE_CLOCK(tsc_clk,	 0, CCM_CGCR2, 13, get_rate_ipg, NULL);
DEFINE_CLOCK(i2c_clk,	 0, CCM_CGCR0,  6, get_rate_i2c, NULL);

#define _REGISTER_CLOCK(d, n, c)	\
	{				\
		.dev_id = d,		\
		.con_id = n,		\
		.clk = &c,		\
	},

static struct clk_lookup lookups[] = {
	_REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk)
	_REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk)
	_REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
	_REGISTER_CLOCK("imx-uart.3", NULL, uart4_clk)
	_REGISTER_CLOCK("imx-uart.4", NULL, uart5_clk)
	_REGISTER_CLOCK("mxc-ehci.0", "usb", usbotg_clk)
	_REGISTER_CLOCK("mxc-ehci.1", "usb", usbotg_clk)
	_REGISTER_CLOCK("mxc-ehci.2", "usb", usbotg_clk)
	_REGISTER_CLOCK("fsl-usb2-udc", "usb", usbotg_clk)
	_REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
	_REGISTER_CLOCK("spi_imx.0", NULL, cspi1_clk)
	_REGISTER_CLOCK("spi_imx.1", NULL, cspi2_clk)
	_REGISTER_CLOCK("spi_imx.2", NULL, cspi3_clk)
	_REGISTER_CLOCK("mxc_pwm.0", NULL, pwm1_clk)
	_REGISTER_CLOCK("mxc_pwm.1", NULL, pwm2_clk)
	_REGISTER_CLOCK("mxc_pwm.2", NULL, pwm3_clk)
	_REGISTER_CLOCK("mxc_pwm.3", NULL, pwm4_clk)
	_REGISTER_CLOCK("mxc-keypad", NULL, kpp_clk)
	_REGISTER_CLOCK("mx25-adc", NULL, tsc_clk)
	_REGISTER_CLOCK("imx-i2c.0", NULL, i2c_clk)
	_REGISTER_CLOCK("imx-i2c.1", NULL, i2c_clk)
	_REGISTER_CLOCK("imx-i2c.2", NULL, i2c_clk)
};

int __init mx25_clocks_init(unsigned long fref)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(lookups); i++)
		clkdev_add(&lookups[i]);

	mxc_timer_init(&gpt_clk, MX25_IO_ADDRESS(MX25_GPT1_BASE_ADDR), 54);

	return 0;
}