2 * Copyright (C) 2009 by Sascha Hauer, Pengutronix
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/list.h>
22 #include <linux/clk.h>
25 #include <asm/clkdev.h>
27 #include <mach/clock.h>
28 #include <mach/hardware.h>
29 #include <mach/common.h>
30 #include <mach/mx25.h>
32 #define CRM_BASE MX25_IO_ADDRESS(MX25_CRM_BASE_ADDR)
34 #define CCM_MPCTL 0x00
35 #define CCM_UPCTL 0x04
37 #define CCM_CGCR0 0x0C
38 #define CCM_CGCR1 0x10
39 #define CCM_CGCR2 0x14
40 #define CCM_PCDR0 0x18
41 #define CCM_PCDR1 0x1C
42 #define CCM_PCDR2 0x20
43 #define CCM_PCDR3 0x24
46 #define CCM_DCVR0 0x30
47 #define CCM_DCVR1 0x34
48 #define CCM_DCVR2 0x38
49 #define CCM_DCVR3 0x3c
55 static unsigned long get_rate_mpll(void)
57 ulong mpctl = __raw_readl(CRM_BASE + CCM_MPCTL);
59 return mxc_decode_pll(mpctl, 24000000);
62 static unsigned long get_rate_upll(void)
64 ulong mpctl = __raw_readl(CRM_BASE + CCM_UPCTL);
66 return mxc_decode_pll(mpctl, 24000000);
69 unsigned long get_rate_arm(struct clk *clk)
71 unsigned long cctl = readl(CRM_BASE + CCM_CCTL);
72 unsigned long rate = get_rate_mpll();
75 rate = (rate * 3) >> 1;
77 return rate / ((cctl >> 30) + 1);
80 static unsigned long get_rate_ahb(struct clk *clk)
82 unsigned long cctl = readl(CRM_BASE + CCM_CCTL);
84 return get_rate_arm(NULL) / (((cctl >> 28) & 0x3) + 1);
87 static unsigned long get_rate_ipg(struct clk *clk)
89 return get_rate_ahb(NULL) >> 1;
92 static unsigned long get_rate_per(int per)
94 unsigned long ofs = (per & 0x3) * 8;
95 unsigned long reg = per & ~0x3;
96 unsigned long val = (readl(CRM_BASE + CCM_PCDR0 + reg) >> ofs) & 0x3f;
99 if (readl(CRM_BASE + 0x64) & (1 << per))
100 fref = get_rate_upll();
102 fref = get_rate_ipg(NULL);
104 return fref / (val + 1);
107 static unsigned long get_rate_uart(struct clk *clk)
109 return get_rate_per(15);
112 static unsigned long get_rate_i2c(struct clk *clk)
114 return get_rate_per(6);
117 static unsigned long get_rate_nfc(struct clk *clk)
119 return get_rate_per(8);
122 static unsigned long get_rate_otg(struct clk *clk)
124 return 48000000; /* FIXME */
127 static int clk_cgcr_enable(struct clk *clk)
131 reg = __raw_readl(clk->enable_reg);
132 reg |= 1 << clk->enable_shift;
133 __raw_writel(reg, clk->enable_reg);
138 static void clk_cgcr_disable(struct clk *clk)
142 reg = __raw_readl(clk->enable_reg);
143 reg &= ~(1 << clk->enable_shift);
144 __raw_writel(reg, clk->enable_reg);
147 #define DEFINE_CLOCK(name, i, er, es, gr, sr) \
148 static struct clk name = { \
150 .enable_reg = CRM_BASE + er, \
151 .enable_shift = es, \
154 .enable = clk_cgcr_enable, \
155 .disable = clk_cgcr_disable, \
158 DEFINE_CLOCK(gpt_clk, 0, CCM_CGCR0, 5, get_rate_ipg, NULL);
159 DEFINE_CLOCK(cspi1_clk, 0, CCM_CGCR1, 5, get_rate_ipg, NULL);
160 DEFINE_CLOCK(cspi2_clk, 0, CCM_CGCR1, 6, get_rate_ipg, NULL);
161 DEFINE_CLOCK(cspi3_clk, 0, CCM_CGCR1, 7, get_rate_ipg, NULL);
162 DEFINE_CLOCK(uart1_clk, 0, CCM_CGCR2, 14, get_rate_uart, NULL);
163 DEFINE_CLOCK(uart2_clk, 0, CCM_CGCR2, 15, get_rate_uart, NULL);
164 DEFINE_CLOCK(uart3_clk, 0, CCM_CGCR2, 16, get_rate_uart, NULL);
165 DEFINE_CLOCK(uart4_clk, 0, CCM_CGCR2, 17, get_rate_uart, NULL);
166 DEFINE_CLOCK(uart5_clk, 0, CCM_CGCR2, 18, get_rate_uart, NULL);
167 DEFINE_CLOCK(nfc_clk, 0, CCM_CGCR0, 8, get_rate_nfc, NULL);
168 DEFINE_CLOCK(usbotg_clk, 0, CCM_CGCR0, 28, get_rate_otg, NULL);
169 DEFINE_CLOCK(pwm1_clk, 0, CCM_CGCR1, 31, get_rate_ipg, NULL);
170 DEFINE_CLOCK(pwm2_clk, 0, CCM_CGCR2, 0, get_rate_ipg, NULL);
171 DEFINE_CLOCK(pwm3_clk, 0, CCM_CGCR2, 1, get_rate_ipg, NULL);
172 DEFINE_CLOCK(pwm4_clk, 0, CCM_CGCR2, 2, get_rate_ipg, NULL);
173 DEFINE_CLOCK(kpp_clk, 0, CCM_CGCR1, 28, get_rate_ipg, NULL);
174 DEFINE_CLOCK(tsc_clk, 0, CCM_CGCR2, 13, get_rate_ipg, NULL);
175 DEFINE_CLOCK(i2c_clk, 0, CCM_CGCR0, 6, get_rate_i2c, NULL);
176 DEFINE_CLOCK(fec_clk, 0, CCM_CGCR0, 23, get_rate_ipg, NULL);
178 #define _REGISTER_CLOCK(d, n, c) \
185 static struct clk_lookup lookups[] = {
186 _REGISTER_CLOCK("imx-uart.0", NULL, uart1_clk)
187 _REGISTER_CLOCK("imx-uart.1", NULL, uart2_clk)
188 _REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
189 _REGISTER_CLOCK("imx-uart.3", NULL, uart4_clk)
190 _REGISTER_CLOCK("imx-uart.4", NULL, uart5_clk)
191 _REGISTER_CLOCK("mxc-ehci.0", "usb", usbotg_clk)
192 _REGISTER_CLOCK("mxc-ehci.1", "usb", usbotg_clk)
193 _REGISTER_CLOCK("mxc-ehci.2", "usb", usbotg_clk)
194 _REGISTER_CLOCK("fsl-usb2-udc", "usb", usbotg_clk)
195 _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
196 _REGISTER_CLOCK("spi_imx.0", NULL, cspi1_clk)
197 _REGISTER_CLOCK("spi_imx.1", NULL, cspi2_clk)
198 _REGISTER_CLOCK("spi_imx.2", NULL, cspi3_clk)
199 _REGISTER_CLOCK("mxc_pwm.0", NULL, pwm1_clk)
200 _REGISTER_CLOCK("mxc_pwm.1", NULL, pwm2_clk)
201 _REGISTER_CLOCK("mxc_pwm.2", NULL, pwm3_clk)
202 _REGISTER_CLOCK("mxc_pwm.3", NULL, pwm4_clk)
203 _REGISTER_CLOCK("mxc-keypad", NULL, kpp_clk)
204 _REGISTER_CLOCK("mx25-adc", NULL, tsc_clk)
205 _REGISTER_CLOCK("imx-i2c.0", NULL, i2c_clk)
206 _REGISTER_CLOCK("imx-i2c.1", NULL, i2c_clk)
207 _REGISTER_CLOCK("imx-i2c.2", NULL, i2c_clk)
208 _REGISTER_CLOCK("fec.0", NULL, fec_clk)
211 int __init mx25_clocks_init(unsigned long fref)
215 for (i = 0; i < ARRAY_SIZE(lookups); i++)
216 clkdev_add(&lookups[i]);
218 mxc_timer_init(&gpt_clk, MX25_IO_ADDRESS(MX25_GPT1_BASE_ADDR), 54);