mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-20 18:54:09 +08:00
feec1277a5
omap2_clk_prepare_for_reboot() is only applicable to OMAP2xxx chips, so rename it to omap2xxx_clk_prepare_for_reboot() and only call it when running on OMAP2xxx chips. Remove the old stub in the OMAP3 clock code. Signed-off-by: Paul Walmsley <paul@pwsan.com>
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/*
|
|
* clock2xxx.c - OMAP2xxx-specific clock integration code
|
|
*
|
|
* Copyright (C) 2005-2008 Texas Instruments, Inc.
|
|
* Copyright (C) 2004-2010 Nokia Corporation
|
|
*
|
|
* Contacts:
|
|
* Richard Woodruff <r-woodruff2@ti.com>
|
|
* Paul Walmsley
|
|
*
|
|
* Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
|
|
* Gordon McNutt and RidgeRun, Inc.
|
|
*
|
|
* 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.
|
|
*/
|
|
#undef DEBUG
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <plat/clock.h>
|
|
|
|
#include "clock.h"
|
|
#include "clock2xxx.h"
|
|
#include "cm.h"
|
|
#include "cm-regbits-24xx.h"
|
|
|
|
struct clk *vclk, *sclk, *dclk;
|
|
|
|
/*
|
|
* Omap24xx specific clock functions
|
|
*/
|
|
|
|
#ifdef CONFIG_ARCH_OMAP2430
|
|
|
|
/**
|
|
* omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
|
|
* @clk: struct clk * being enabled
|
|
* @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
|
|
* @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
|
|
*
|
|
* OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
|
|
* CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function
|
|
* passes back the correct CM_IDLEST register address for I2CHS
|
|
* modules. No return value.
|
|
*/
|
|
static void omap2430_clk_i2chs_find_idlest(struct clk *clk,
|
|
void __iomem **idlest_reg,
|
|
u8 *idlest_bit)
|
|
{
|
|
*idlest_reg = OMAP_CM_REGADDR(CORE_MOD, CM_IDLEST);
|
|
*idlest_bit = clk->enable_bit;
|
|
}
|
|
|
|
#else
|
|
#define omap2430_clk_i2chs_find_idlest NULL
|
|
#endif
|
|
|
|
/* 2430 I2CHS has non-standard IDLEST register */
|
|
const struct clkops clkops_omap2430_i2chs_wait = {
|
|
.enable = omap2_dflt_clk_enable,
|
|
.disable = omap2_dflt_clk_disable,
|
|
.find_idlest = omap2430_clk_i2chs_find_idlest,
|
|
.find_companion = omap2_clk_dflt_find_companion,
|
|
};
|
|
|
|
/*
|
|
* Set clocks for bypass mode for reboot to work.
|
|
*/
|
|
void omap2xxx_clk_prepare_for_reboot(void)
|
|
{
|
|
u32 rate;
|
|
|
|
if (vclk == NULL || sclk == NULL)
|
|
return;
|
|
|
|
rate = clk_get_rate(sclk);
|
|
clk_set_rate(vclk, rate);
|
|
}
|
|
|
|
/*
|
|
* Switch the MPU rate if specified on cmdline.
|
|
* We cannot do this early until cmdline is parsed.
|
|
*/
|
|
static int __init omap2xxx_clk_arch_init(void)
|
|
{
|
|
struct clk *virt_prcm_set, *sys_ck, *dpll_ck, *mpu_ck;
|
|
unsigned long sys_ck_rate;
|
|
|
|
if (!cpu_is_omap24xx())
|
|
return 0;
|
|
|
|
if (!mpurate)
|
|
return -EINVAL;
|
|
|
|
virt_prcm_set = clk_get(NULL, "virt_prcm_set");
|
|
sys_ck = clk_get(NULL, "sys_ck");
|
|
dpll_ck = clk_get(NULL, "dpll_ck");
|
|
mpu_ck = clk_get(NULL, "mpu_ck");
|
|
|
|
if (clk_set_rate(virt_prcm_set, mpurate))
|
|
printk(KERN_ERR "Could not find matching MPU rate\n");
|
|
|
|
recalculate_root_clocks();
|
|
|
|
sys_ck_rate = clk_get_rate(sys_ck);
|
|
|
|
pr_info("Switched to new clocking rate (Crystal/DPLL/MPU): "
|
|
"%ld.%01ld/%ld/%ld MHz\n",
|
|
(sys_ck_rate / 1000000), (sys_ck_rate / 100000) % 10,
|
|
(clk_get_rate(dpll_ck) / 1000000),
|
|
(clk_get_rate(mpu_ck) / 1000000));
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(omap2xxx_clk_arch_init);
|
|
|
|
|