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/*
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
* JZ4740 SoC clock support
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <asm/mach-jz4740/clock.h>
#include <asm/mach-jz4740/base.h>
#include "clock.h"
#define JZ_REG_CLOCK_PLL 0x10
#define JZ_REG_CLOCK_GATE 0x20
#define JZ_CLOCK_GATE_UART0 BIT(0)
#define JZ_CLOCK_GATE_TCU BIT(1)
#define JZ_CLOCK_GATE_UDC BIT(11)
#define JZ_CLOCK_GATE_DMAC BIT(12)
#define JZ_CLOCK_PLL_STABLE BIT(10)
#define JZ_CLOCK_PLL_ENABLED BIT(8)
static void __iomem *jz_clock_base;
static uint32_t jz_clk_reg_read(int reg)
{
return readl(jz_clock_base + reg);
}
static void jz_clk_reg_set_bits(int reg, uint32_t mask)
{
uint32_t val;
val = readl(jz_clock_base + reg);
val |= mask;
writel(val, jz_clock_base + reg);
}
static void jz_clk_reg_clear_bits(int reg, uint32_t mask)
{
uint32_t val;
val = readl(jz_clock_base + reg);
val &= ~mask;
writel(val, jz_clock_base + reg);
}
void jz4740_clock_udc_disable_auto_suspend(void)
{
jz_clk_reg_clear_bits(JZ_REG_CLOCK_GATE, JZ_CLOCK_GATE_UDC);
}
EXPORT_SYMBOL_GPL(jz4740_clock_udc_disable_auto_suspend);
void jz4740_clock_udc_enable_auto_suspend(void)
{
jz_clk_reg_set_bits(JZ_REG_CLOCK_GATE, JZ_CLOCK_GATE_UDC);
}
EXPORT_SYMBOL_GPL(jz4740_clock_udc_enable_auto_suspend);
void jz4740_clock_suspend(void)
{
jz_clk_reg_set_bits(JZ_REG_CLOCK_GATE,
JZ_CLOCK_GATE_TCU | JZ_CLOCK_GATE_DMAC | JZ_CLOCK_GATE_UART0);
jz_clk_reg_clear_bits(JZ_REG_CLOCK_PLL, JZ_CLOCK_PLL_ENABLED);
}
void jz4740_clock_resume(void)
{
uint32_t pll;
jz_clk_reg_set_bits(JZ_REG_CLOCK_PLL, JZ_CLOCK_PLL_ENABLED);
do {
pll = jz_clk_reg_read(JZ_REG_CLOCK_PLL);
} while (!(pll & JZ_CLOCK_PLL_STABLE));
jz_clk_reg_clear_bits(JZ_REG_CLOCK_GATE,
JZ_CLOCK_GATE_TCU | JZ_CLOCK_GATE_DMAC | JZ_CLOCK_GATE_UART0);
}
int jz4740_clock_init(void)
{
jz_clock_base = ioremap(JZ4740_CPM_BASE_ADDR, 0x100);
if (!jz_clock_base)
return -EBUSY;
return 0;
}
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