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>
24 #include <linux/sysdev.h>
26 #include <asm/hardware.h>
27 #include <asm/arch/irqs.h>
28 #include <asm/arch/pxa-regs.h>
29 #include <asm/arch/pxa2xx-regs.h>
30 #include <asm/arch/mfp-pxa25x.h>
31 #include <asm/arch/pm.h>
32 #include <asm/arch/dma.h>
39 * Various clock factors driven by the CCCR register.
42 /* Crystal Frequency to Memory Frequency Multiplier (L) */
43 static unsigned char L_clk_mult
[32] = { 0, 27, 32, 36, 40, 45, 0, };
45 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
46 static unsigned char M_clk_mult
[4] = { 0, 1, 2, 4 };
48 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
49 /* Note: we store the value N * 2 here. */
50 static unsigned char N2_clk_mult
[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
53 #define BASE_CLK 3686400
56 * Get the clock frequency as reflected by CCCR and the turbo flag.
57 * We assume these values have been applied via a fcs.
58 * If info is not 0 we also display the current settings.
60 unsigned int pxa25x_get_clk_frequency_khz(int info
)
62 unsigned long cccr
, turbo
;
63 unsigned int l
, L
, m
, M
, n2
, N
;
66 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo
) );
68 l
= L_clk_mult
[(cccr
>> 0) & 0x1f];
69 m
= M_clk_mult
[(cccr
>> 5) & 0x03];
70 n2
= N2_clk_mult
[(cccr
>> 7) & 0x07];
79 printk( KERN_INFO
"Memory clock: %d.%02dMHz (*%d)\n",
80 L
/ 1000000, (L
% 1000000) / 10000, l
);
82 printk( KERN_INFO
"Run Mode clock: %d.%02dMHz (*%d)\n",
83 M
/ 1000000, (M
% 1000000) / 10000, m
);
85 printk( KERN_INFO
"Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
86 N
/ 1000000, (N
% 1000000) / 10000, n2
/ 2, (n2
% 2) * 5,
87 (turbo
& 1) ? "" : "in" );
90 return (turbo
& 1) ? (N
/1000) : (M
/1000);
94 * Return the current memory clock frequency in units of 10kHz
96 unsigned int pxa25x_get_memclk_frequency_10khz(void)
98 return L_clk_mult
[(CCCR
>> 0) & 0x1f] * BASE_CLK
/ 10000;
101 static unsigned long clk_pxa25x_lcd_getrate(struct clk
*clk
)
103 return pxa25x_get_memclk_frequency_10khz() * 10000;
106 static const struct clkops clk_pxa25x_lcd_ops
= {
107 .enable
= clk_cken_enable
,
108 .disable
= clk_cken_disable
,
109 .getrate
= clk_pxa25x_lcd_getrate
,
113 * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
114 * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
115 * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
117 static struct clk pxa25x_hwuart_clk
=
118 INIT_CKEN("UARTCLK", HWUART
, 14745600, 1, &pxa_device_hwuart
.dev
)
122 * PXA 2xx clock declarations. Order is important (see aliases below)
123 * Please be careful not to disrupt the ordering.
125 static struct clk pxa25x_clks
[] = {
126 INIT_CK("LCDCLK", LCD
, &clk_pxa25x_lcd_ops
, &pxa_device_fb
.dev
),
127 INIT_CKEN("UARTCLK", FFUART
, 14745600, 1, &pxa_device_ffuart
.dev
),
128 INIT_CKEN("UARTCLK", BTUART
, 14745600, 1, &pxa_device_btuart
.dev
),
129 INIT_CKEN("UARTCLK", STUART
, 14745600, 1, NULL
),
130 INIT_CKEN("UDCCLK", USB
, 47923000, 5, &pxa25x_device_udc
.dev
),
131 INIT_CKEN("MMCCLK", MMC
, 19169000, 0, &pxa_device_mci
.dev
),
132 INIT_CKEN("I2CCLK", I2C
, 31949000, 0, &pxa_device_i2c
.dev
),
134 INIT_CKEN("SSPCLK", SSP
, 3686400, 0, &pxa25x_device_ssp
.dev
),
135 INIT_CKEN("SSPCLK", NSSP
, 3686400, 0, &pxa25x_device_nssp
.dev
),
136 INIT_CKEN("SSPCLK", ASSP
, 3686400, 0, &pxa25x_device_assp
.dev
),
137 INIT_CKEN("PWMCLK", PWM0
, 3686400, 0, &pxa25x_device_pwm0
.dev
),
138 INIT_CKEN("PWMCLK", PWM1
, 3686400, 0, &pxa25x_device_pwm1
.dev
),
140 INIT_CKEN("AC97CLK", AC97
, 24576000, 0, NULL
),
143 INIT_CKEN("I2SCLK", I2S, 14745600, 0, NULL),
145 INIT_CKEN("FICPCLK", FICP
, 47923000, 0, NULL
),
148 static struct clk gpio7_clk
= INIT_CKOTHER("GPIO7_CK", &pxa25x_clks
[4], NULL
);
152 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
153 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
156 * List of global PXA peripheral registers to preserve.
157 * More ones like CP and general purpose register values are preserved
158 * with the stack pointer in sleep.S.
160 enum { SLEEP_SAVE_PGSR0
, SLEEP_SAVE_PGSR1
, SLEEP_SAVE_PGSR2
,
162 SLEEP_SAVE_GAFR0_L
, SLEEP_SAVE_GAFR0_U
,
163 SLEEP_SAVE_GAFR1_L
, SLEEP_SAVE_GAFR1_U
,
164 SLEEP_SAVE_GAFR2_L
, SLEEP_SAVE_GAFR2_U
,
174 static void pxa25x_cpu_pm_save(unsigned long *sleep_save
)
176 SAVE(PGSR0
); SAVE(PGSR1
); SAVE(PGSR2
);
178 SAVE(GAFR0_L
); SAVE(GAFR0_U
);
179 SAVE(GAFR1_L
); SAVE(GAFR1_U
);
180 SAVE(GAFR2_L
); SAVE(GAFR2_U
);
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(GAFR0_L
); RESTORE(GAFR0_U
);
196 RESTORE(GAFR1_L
); RESTORE(GAFR1_U
);
197 RESTORE(GAFR2_L
); RESTORE(GAFR2_U
);
198 RESTORE(PGSR0
); RESTORE(PGSR1
); RESTORE(PGSR2
);
200 PSSR
= PSSR_RDH
| PSSR_PH
;
206 static void pxa25x_cpu_pm_enter(suspend_state_t state
)
208 /* Clear reset status */
209 RCSR
= RCSR_HWR
| RCSR_WDR
| RCSR_SMR
| RCSR_GPR
;
213 /* set resume return address */
214 PSPR
= virt_to_phys(pxa_cpu_resume
);
215 pxa25x_cpu_suspend(PWRMODE_SLEEP
);
220 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns
= {
221 .save_count
= SLEEP_SAVE_COUNT
,
222 .valid
= suspend_valid_only_mem
,
223 .save
= pxa25x_cpu_pm_save
,
224 .restore
= pxa25x_cpu_pm_restore
,
225 .enter
= pxa25x_cpu_pm_enter
,
228 static void __init
pxa25x_init_pm(void)
230 pxa_cpu_pm_fns
= &pxa25x_cpu_pm_fns
;
233 static inline void pxa25x_init_pm(void) {}
236 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
239 static int pxa25x_set_wake(unsigned int irq
, unsigned int on
)
241 int gpio
= IRQ_TO_GPIO(irq
);
244 if (gpio
>= 0 && gpio
< 85)
245 return gpio_set_wake(gpio
, on
);
247 if (irq
== IRQ_RTCAlrm
) {
263 void __init
pxa25x_init_irq(void)
265 pxa_init_irq(32, pxa25x_set_wake
);
266 pxa_init_gpio(85, pxa25x_set_wake
);
269 static struct platform_device
*pxa25x_devices
[] __initdata
= {
283 static struct sys_device pxa25x_sysdev
[] = {
285 .cls
= &pxa_irq_sysclass
,
287 .cls
= &pxa_gpio_sysclass
,
291 static int __init
pxa25x_init(void)
295 /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
297 clks_register(&pxa25x_hwuart_clk
, 1);
299 if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
300 clks_register(pxa25x_clks
, ARRAY_SIZE(pxa25x_clks
));
302 if ((ret
= pxa_init_dma(16)))
307 for (i
= 0; i
< ARRAY_SIZE(pxa25x_sysdev
); i
++) {
308 ret
= sysdev_register(&pxa25x_sysdev
[i
]);
310 pr_err("failed to register sysdev[%d]\n", i
);
313 ret
= platform_add_devices(pxa25x_devices
,
314 ARRAY_SIZE(pxa25x_devices
));
319 /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
321 ret
= platform_device_register(&pxa_device_hwuart
);
323 clks_register(&gpio7_clk
, 1);
328 postcore_initcall(pxa25x_init
);