80a18573ce
Patch from Todd Poynor Add symbols for PXA2xx PWRMODE register M field that selects low-power mode, replace unadorned constants. Honor power mode parameter of pxa_cpu_suspend(mode), no longer force to 3 (sleep). Full Deep Sleep low-power mode support for PXA27x is pending generic PM interfaces to select more than 2 suspend-to-RAM-style power modes, but this is expected soon. This can be hardcoded in the meantime by replacing the pxa_cpu_suspend() parameter value. From David Burrage and Todd Poynor. Try #2 removes one of the register copies and moves the code to save the pxa_cpu_suspend parameter to immediately surround the call that requires the parameter value be preserved. Signed-off-by: Todd Poynor <tpoynor@mvista.com> Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
|
|
* linux/arch/arm/mach-pxa/pxa25x.c
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: Jun 15, 2001
|
|
* Copyright: MontaVista Software Inc.
|
|
*
|
|
* Code specific to PXA21x/25x/26x variants.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Since this file should be linked before any other machine specific file,
|
|
* the __initcall() here will be executed first. This serves as default
|
|
* initialization stuff for PXA machines which can be overridden later if
|
|
* need be.
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/pm.h>
|
|
|
|
#include <asm/hardware.h>
|
|
#include <asm/arch/pxa-regs.h>
|
|
|
|
#include "generic.h"
|
|
|
|
/*
|
|
* Various clock factors driven by the CCCR register.
|
|
*/
|
|
|
|
/* Crystal Frequency to Memory Frequency Multiplier (L) */
|
|
static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
|
|
|
|
/* Memory Frequency to Run Mode Frequency Multiplier (M) */
|
|
static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
|
|
|
|
/* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
|
|
/* Note: we store the value N * 2 here. */
|
|
static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
|
|
|
|
/* Crystal clock */
|
|
#define BASE_CLK 3686400
|
|
|
|
/*
|
|
* Get the clock frequency as reflected by CCCR and the turbo flag.
|
|
* We assume these values have been applied via a fcs.
|
|
* If info is not 0 we also display the current settings.
|
|
*/
|
|
unsigned int get_clk_frequency_khz(int info)
|
|
{
|
|
unsigned long cccr, turbo;
|
|
unsigned int l, L, m, M, n2, N;
|
|
|
|
cccr = CCCR;
|
|
asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
|
|
|
|
l = L_clk_mult[(cccr >> 0) & 0x1f];
|
|
m = M_clk_mult[(cccr >> 5) & 0x03];
|
|
n2 = N2_clk_mult[(cccr >> 7) & 0x07];
|
|
|
|
L = l * BASE_CLK;
|
|
M = m * L;
|
|
N = n2 * M / 2;
|
|
|
|
if(info)
|
|
{
|
|
L += 5000;
|
|
printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
|
|
L / 1000000, (L % 1000000) / 10000, l );
|
|
M += 5000;
|
|
printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
|
|
M / 1000000, (M % 1000000) / 10000, m );
|
|
N += 5000;
|
|
printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
|
|
N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
|
|
(turbo & 1) ? "" : "in" );
|
|
}
|
|
|
|
return (turbo & 1) ? (N/1000) : (M/1000);
|
|
}
|
|
|
|
EXPORT_SYMBOL(get_clk_frequency_khz);
|
|
|
|
/*
|
|
* Return the current memory clock frequency in units of 10kHz
|
|
*/
|
|
unsigned int get_memclk_frequency_10khz(void)
|
|
{
|
|
return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
|
|
}
|
|
|
|
EXPORT_SYMBOL(get_memclk_frequency_10khz);
|
|
|
|
/*
|
|
* Return the current LCD clock frequency in units of 10kHz
|
|
*/
|
|
unsigned int get_lcdclk_frequency_10khz(void)
|
|
{
|
|
return get_memclk_frequency_10khz();
|
|
}
|
|
|
|
EXPORT_SYMBOL(get_lcdclk_frequency_10khz);
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
int pxa_cpu_pm_prepare(suspend_state_t state)
|
|
{
|
|
switch (state) {
|
|
case PM_SUSPEND_MEM:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void pxa_cpu_pm_enter(suspend_state_t state)
|
|
{
|
|
extern void pxa_cpu_suspend(unsigned int);
|
|
extern void pxa_cpu_resume(void);
|
|
|
|
CKEN = 0;
|
|
|
|
switch (state) {
|
|
case PM_SUSPEND_MEM:
|
|
/* set resume return address */
|
|
PSPR = virt_to_phys(pxa_cpu_resume);
|
|
pxa_cpu_suspend(PWRMODE_SLEEP);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#endif
|