2 * linux/arch/arm/mach-pxa/pxa25x.c
4 * Author: Nicolas Pitre
5 * Created: Jun 15, 2001
6 * Copyright: MontaVista Software Inc.
8 * Code specific to PXA21x/25x/26x variants.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
14 * Since this file should be linked before any other machine specific file,
15 * the __initcall() here will be executed first. This serves as default
16 * initialization stuff for PXA machines which can be overridden later if
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/platform_device.h>
23 #include <linux/suspend.h>
25 #include <asm/hardware.h>
26 #include <asm/arch/irqs.h>
27 #include <asm/arch/pxa-regs.h>
28 #include <asm/arch/pm.h>
29 #include <asm/arch/dma.h>
36 * Various clock factors driven by the CCCR register.
39 /* Crystal Frequency to Memory Frequency Multiplier (L) */
40 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
42 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
43 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
45 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
46 /* Note: we store the value N * 2 here. */
47 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
50 #define BASE_CLK 3686400
53 * Get the clock frequency as reflected by CCCR and the turbo flag.
54 * We assume these values have been applied via a fcs.
55 * If info is not 0 we also display the current settings.
57 unsigned int pxa25x_get_clk_frequency_khz(int info)
59 unsigned long cccr, turbo;
60 unsigned int l, L, m, M, n2, N;
63 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
65 l = L_clk_mult[(cccr >> 0) & 0x1f];
66 m = M_clk_mult[(cccr >> 5) & 0x03];
67 n2 = N2_clk_mult[(cccr >> 7) & 0x07];
76 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
77 L / 1000000, (L % 1000000) / 10000, l );
79 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
80 M / 1000000, (M % 1000000) / 10000, m );
82 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
83 N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
84 (turbo & 1) ? "" : "in" );
87 return (turbo & 1) ? (N/1000) : (M/1000);
91 * Return the current memory clock frequency in units of 10kHz
93 unsigned int pxa25x_get_memclk_frequency_10khz(void)
95 return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
98 static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk)
100 return pxa25x_get_memclk_frequency_10khz() * 10000;
103 static const struct clkops clk_pxa25x_lcd_ops = {
104 .enable = clk_cken_enable,
105 .disable = clk_cken_disable,
106 .getrate = clk_pxa25x_lcd_getrate,
110 * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
111 * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
112 * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
114 static struct clk pxa25x_clks[] = {
115 INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev),
116 INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev),
117 INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),
118 INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),
119 INIT_CKEN("UARTCLK", STUART, 14745600, 1, NULL),
120 INIT_CKEN("UDCCLK", USB, 47923000, 5, &pxa_device_udc.dev),
121 INIT_CKEN("MMCCLK", MMC, 19169000, 0, &pxa_device_mci.dev),
122 INIT_CKEN("I2CCLK", I2C, 31949000, 0, &pxa_device_i2c.dev),
124 INIT_CKEN("PWMCLK", PWM0, 3686400, 0, NULL),
125 INIT_CKEN("PWMCLK", PWM0, 3686400, 0, NULL),
126 INIT_CKEN("SSPCLK", SSP, 3686400, 0, NULL),
127 INIT_CKEN("I2SCLK", I2S, 14745600, 0, NULL),
128 INIT_CKEN("NSSPCLK", NSSP, 3686400, 0, NULL),
130 INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL),
135 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
136 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
138 #define RESTORE_GPLEVEL(n) do { \
139 GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \
140 GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \
144 * List of global PXA peripheral registers to preserve.
145 * More ones like CP and general purpose register values are preserved
146 * with the stack pointer in sleep.S.
148 enum { SLEEP_SAVE_START = 0,
150 SLEEP_SAVE_GPLR0, SLEEP_SAVE_GPLR1, SLEEP_SAVE_GPLR2,
151 SLEEP_SAVE_GPDR0, SLEEP_SAVE_GPDR1, SLEEP_SAVE_GPDR2,
152 SLEEP_SAVE_GRER0, SLEEP_SAVE_GRER1, SLEEP_SAVE_GRER2,
153 SLEEP_SAVE_GFER0, SLEEP_SAVE_GFER1, SLEEP_SAVE_GFER2,
154 SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2,
156 SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
157 SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
158 SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
169 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
171 SAVE(GPLR0); SAVE(GPLR1); SAVE(GPLR2);
172 SAVE(GPDR0); SAVE(GPDR1); SAVE(GPDR2);
173 SAVE(GRER0); SAVE(GRER1); SAVE(GRER2);
174 SAVE(GFER0); SAVE(GFER1); SAVE(GFER2);
175 SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
177 SAVE(GAFR0_L); SAVE(GAFR0_U);
178 SAVE(GAFR1_L); SAVE(GAFR1_U);
179 SAVE(GAFR2_L); SAVE(GAFR2_U);
181 SAVE(ICMR); ICMR = 0;
185 /* Clear GPIO transition detect bits */
186 GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
189 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
191 /* ensure not to come back here if it wasn't intended */
194 /* restore registers */
195 RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
196 RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2);
197 RESTORE(GAFR0_L); RESTORE(GAFR0_U);
198 RESTORE(GAFR1_L); RESTORE(GAFR1_U);
199 RESTORE(GAFR2_L); RESTORE(GAFR2_U);
200 RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2);
201 RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2);
202 RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
204 PSSR = PSSR_RDH | PSSR_PH;
214 static void pxa25x_cpu_pm_enter(suspend_state_t state)
220 /* set resume return address */
221 PSPR = virt_to_phys(pxa_cpu_resume);
222 pxa25x_cpu_suspend(PWRMODE_SLEEP);
227 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
228 .save_size = SLEEP_SAVE_SIZE,
229 .valid = suspend_valid_only_mem,
230 .save = pxa25x_cpu_pm_save,
231 .restore = pxa25x_cpu_pm_restore,
232 .enter = pxa25x_cpu_pm_enter,
235 static void __init pxa25x_init_pm(void)
237 pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
241 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
244 static int pxa25x_set_wake(unsigned int irq, unsigned int on)
246 int gpio = IRQ_TO_GPIO(irq);
247 uint32_t gpio_bit, mask = 0;
249 if (gpio >= 0 && gpio <= 15) {
250 gpio_bit = GPIO_bit(gpio);
253 if (GRER(gpio) | gpio_bit)
258 if (GFER(gpio) | gpio_bit)
266 if (irq == IRQ_RTCAlrm) {
282 void __init pxa25x_init_irq(void)
285 pxa_init_irq_gpio(85);
286 pxa_init_irq_set_wake(pxa25x_set_wake);
289 static struct platform_device *pxa25x_devices[] __initdata = {
302 static int __init pxa25x_init(void)
306 if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
307 clks_register(pxa25x_clks, ARRAY_SIZE(pxa25x_clks));
309 if ((ret = pxa_init_dma(16)))
314 ret = platform_add_devices(pxa25x_devices,
315 ARRAY_SIZE(pxa25x_devices));
317 /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
319 ret = platform_device_register(&pxa_device_hwuart);
324 subsys_initcall(pxa25x_init);