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f30c2269 | 1 | /* linux/arch/arm/mach-s3c2410/s3c2410-clock.c |
99c13853 BD |
2 | * |
3 | * Copyright (c) 2006 Simtec Electronics | |
4 | * Ben Dooks <ben@simtec.co.uk> | |
5 | * | |
6 | * S3C2410,S3C2440,S3C2442 Clock control support | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <linux/init.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/sysdev.h> | |
30 | #include <linux/clk.h> | |
31 | #include <linux/mutex.h> | |
32 | #include <linux/delay.h> | |
b6d1f542 | 33 | #include <linux/serial_core.h> |
99c13853 | 34 | |
7ae9e420 BD |
35 | #include <asm/mach/map.h> |
36 | ||
99c13853 BD |
37 | #include <asm/hardware.h> |
38 | #include <asm/io.h> | |
39 | ||
7ae9e420 | 40 | #include <asm/arch/regs-serial.h> |
99c13853 BD |
41 | #include <asm/arch/regs-clock.h> |
42 | #include <asm/arch/regs-gpio.h> | |
43 | ||
7ae9e420 | 44 | #include "s3c2410.h" |
99c13853 BD |
45 | #include "clock.h" |
46 | #include "cpu.h" | |
47 | ||
48 | int s3c2410_clkcon_enable(struct clk *clk, int enable) | |
49 | { | |
50 | unsigned int clocks = clk->ctrlbit; | |
51 | unsigned long clkcon; | |
52 | ||
53 | clkcon = __raw_readl(S3C2410_CLKCON); | |
54 | ||
55 | if (enable) | |
56 | clkcon |= clocks; | |
57 | else | |
58 | clkcon &= ~clocks; | |
59 | ||
60 | /* ensure none of the special function bits set */ | |
61 | clkcon &= ~(S3C2410_CLKCON_IDLE|S3C2410_CLKCON_POWER); | |
62 | ||
63 | __raw_writel(clkcon, S3C2410_CLKCON); | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static int s3c2410_upll_enable(struct clk *clk, int enable) | |
69 | { | |
70 | unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW); | |
71 | unsigned long orig = clkslow; | |
72 | ||
73 | if (enable) | |
74 | clkslow &= ~S3C2410_CLKSLOW_UCLK_OFF; | |
75 | else | |
76 | clkslow |= S3C2410_CLKSLOW_UCLK_OFF; | |
77 | ||
78 | __raw_writel(clkslow, S3C2410_CLKSLOW); | |
79 | ||
80 | /* if we started the UPLL, then allow to settle */ | |
81 | ||
82 | if (enable && (orig & S3C2410_CLKSLOW_UCLK_OFF)) | |
83 | udelay(200); | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | /* standard clock definitions */ | |
89 | ||
90 | static struct clk init_clocks_disable[] = { | |
91 | { | |
92 | .name = "nand", | |
93 | .id = -1, | |
94 | .parent = &clk_h, | |
95 | .enable = s3c2410_clkcon_enable, | |
96 | .ctrlbit = S3C2410_CLKCON_NAND, | |
97 | }, { | |
98 | .name = "sdi", | |
99 | .id = -1, | |
100 | .parent = &clk_p, | |
101 | .enable = s3c2410_clkcon_enable, | |
102 | .ctrlbit = S3C2410_CLKCON_SDI, | |
103 | }, { | |
104 | .name = "adc", | |
105 | .id = -1, | |
106 | .parent = &clk_p, | |
107 | .enable = s3c2410_clkcon_enable, | |
108 | .ctrlbit = S3C2410_CLKCON_ADC, | |
109 | }, { | |
110 | .name = "i2c", | |
111 | .id = -1, | |
112 | .parent = &clk_p, | |
113 | .enable = s3c2410_clkcon_enable, | |
114 | .ctrlbit = S3C2410_CLKCON_IIC, | |
115 | }, { | |
116 | .name = "iis", | |
117 | .id = -1, | |
118 | .parent = &clk_p, | |
119 | .enable = s3c2410_clkcon_enable, | |
120 | .ctrlbit = S3C2410_CLKCON_IIS, | |
121 | }, { | |
122 | .name = "spi", | |
123 | .id = -1, | |
124 | .parent = &clk_p, | |
125 | .enable = s3c2410_clkcon_enable, | |
126 | .ctrlbit = S3C2410_CLKCON_SPI, | |
127 | } | |
128 | }; | |
129 | ||
130 | static struct clk init_clocks[] = { | |
131 | { | |
132 | .name = "lcd", | |
133 | .id = -1, | |
134 | .parent = &clk_h, | |
135 | .enable = s3c2410_clkcon_enable, | |
136 | .ctrlbit = S3C2410_CLKCON_LCDC, | |
137 | }, { | |
138 | .name = "gpio", | |
139 | .id = -1, | |
140 | .parent = &clk_p, | |
141 | .enable = s3c2410_clkcon_enable, | |
142 | .ctrlbit = S3C2410_CLKCON_GPIO, | |
143 | }, { | |
144 | .name = "usb-host", | |
145 | .id = -1, | |
146 | .parent = &clk_h, | |
147 | .enable = s3c2410_clkcon_enable, | |
148 | .ctrlbit = S3C2410_CLKCON_USBH, | |
149 | }, { | |
150 | .name = "usb-device", | |
151 | .id = -1, | |
152 | .parent = &clk_h, | |
153 | .enable = s3c2410_clkcon_enable, | |
154 | .ctrlbit = S3C2410_CLKCON_USBD, | |
155 | }, { | |
156 | .name = "timers", | |
157 | .id = -1, | |
158 | .parent = &clk_p, | |
159 | .enable = s3c2410_clkcon_enable, | |
160 | .ctrlbit = S3C2410_CLKCON_PWMT, | |
161 | }, { | |
162 | .name = "uart", | |
163 | .id = 0, | |
164 | .parent = &clk_p, | |
165 | .enable = s3c2410_clkcon_enable, | |
166 | .ctrlbit = S3C2410_CLKCON_UART0, | |
167 | }, { | |
168 | .name = "uart", | |
169 | .id = 1, | |
170 | .parent = &clk_p, | |
171 | .enable = s3c2410_clkcon_enable, | |
172 | .ctrlbit = S3C2410_CLKCON_UART1, | |
173 | }, { | |
174 | .name = "uart", | |
175 | .id = 2, | |
176 | .parent = &clk_p, | |
177 | .enable = s3c2410_clkcon_enable, | |
178 | .ctrlbit = S3C2410_CLKCON_UART2, | |
179 | }, { | |
180 | .name = "rtc", | |
181 | .id = -1, | |
182 | .parent = &clk_p, | |
183 | .enable = s3c2410_clkcon_enable, | |
184 | .ctrlbit = S3C2410_CLKCON_RTC, | |
185 | }, { | |
186 | .name = "watchdog", | |
187 | .id = -1, | |
188 | .parent = &clk_p, | |
189 | .ctrlbit = 0, | |
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190 | }, { |
191 | .name = "usb-bus-host", | |
192 | .id = -1, | |
193 | .parent = &clk_usb_bus, | |
194 | }, { | |
195 | .name = "usb-bus-gadget", | |
196 | .id = -1, | |
197 | .parent = &clk_usb_bus, | |
198 | }, | |
99c13853 BD |
199 | }; |
200 | ||
201 | /* s3c2410_baseclk_add() | |
202 | * | |
203 | * Add all the clocks used by the s3c2410 or compatible CPUs | |
204 | * such as the S3C2440 and S3C2442. | |
205 | * | |
206 | * We cannot use a system device as we are needed before any | |
207 | * of the init-calls that initialise the devices are actually | |
208 | * done. | |
209 | */ | |
210 | ||
211 | int __init s3c2410_baseclk_add(void) | |
212 | { | |
213 | unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW); | |
214 | unsigned long clkcon = __raw_readl(S3C2410_CLKCON); | |
215 | struct clk *clkp; | |
216 | struct clk *xtal; | |
217 | int ret; | |
218 | int ptr; | |
219 | ||
220 | clk_upll.enable = s3c2410_upll_enable; | |
221 | ||
222 | if (s3c24xx_register_clock(&clk_usb_bus) < 0) | |
223 | printk(KERN_ERR "failed to register usb bus clock\n"); | |
224 | ||
225 | /* register clocks from clock array */ | |
226 | ||
227 | clkp = init_clocks; | |
228 | for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) { | |
229 | /* ensure that we note the clock state */ | |
230 | ||
231 | clkp->usage = clkcon & clkp->ctrlbit ? 1 : 0; | |
232 | ||
233 | ret = s3c24xx_register_clock(clkp); | |
234 | if (ret < 0) { | |
235 | printk(KERN_ERR "Failed to register clock %s (%d)\n", | |
236 | clkp->name, ret); | |
237 | } | |
238 | } | |
239 | ||
240 | /* We must be careful disabling the clocks we are not intending to | |
241 | * be using at boot time, as subsytems such as the LCD which do | |
242 | * their own DMA requests to the bus can cause the system to lockup | |
243 | * if they where in the middle of requesting bus access. | |
244 | * | |
245 | * Disabling the LCD clock if the LCD is active is very dangerous, | |
246 | * and therefore the bootloader should be careful to not enable | |
247 | * the LCD clock if it is not needed. | |
248 | */ | |
249 | ||
250 | /* install (and disable) the clocks we do not need immediately */ | |
251 | ||
252 | clkp = init_clocks_disable; | |
253 | for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) { | |
254 | ||
255 | ret = s3c24xx_register_clock(clkp); | |
256 | if (ret < 0) { | |
257 | printk(KERN_ERR "Failed to register clock %s (%d)\n", | |
258 | clkp->name, ret); | |
259 | } | |
260 | ||
261 | s3c2410_clkcon_enable(clkp, 0); | |
262 | } | |
263 | ||
264 | /* show the clock-slow value */ | |
265 | ||
266 | xtal = clk_get(NULL, "xtal"); | |
267 | ||
268 | printk("CLOCK: Slow mode (%ld.%ld MHz), %s, MPLL %s, UPLL %s\n", | |
269 | print_mhz(clk_get_rate(xtal) / | |
270 | ( 2 * S3C2410_CLKSLOW_GET_SLOWVAL(clkslow))), | |
271 | (clkslow & S3C2410_CLKSLOW_SLOW) ? "slow" : "fast", | |
272 | (clkslow & S3C2410_CLKSLOW_MPLL_OFF) ? "off" : "on", | |
273 | (clkslow & S3C2410_CLKSLOW_UCLK_OFF) ? "off" : "on"); | |
274 | ||
275 | return 0; | |
276 | } |