- 根目录:
- arch
- mips
- ath79
- clock.c
/*
* Atheros AR71XX/AR724X/AR913X common routines
*
* Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
*
* Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <asm/div64.h>
#include <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>
#include "common.h"
#define AR71XX_BASE_FREQ 40000000
#define AR724X_BASE_FREQ 5000000
#define AR913X_BASE_FREQ 5000000
struct clk {
unsigned long rate;
};
static void __init ath79_add_sys_clkdev(const char *id, unsigned long rate)
{
struct clk *clk;
int err;
clk = kzalloc(sizeof(*clk), GFP_KERNEL);
if (!clk)
panic("failed to allocate %s clock structure", id);
clk->rate = rate;
err = clk_register_clkdev(clk, id, NULL);
if (err)
panic("unable to register %s clock device", id);
}
static void __init ar71xx_clocks_init(void)
{
unsigned long ref_rate;
unsigned long cpu_rate;
unsigned long ddr_rate;
unsigned long ahb_rate;
u32 pll;
u32 freq;
u32 div;
ref_rate = AR71XX_BASE_FREQ;
pll = ath79_pll_rr(AR71XX_PLL_REG_CPU_CONFIG);
div = ((pll >> AR71XX_PLL_DIV_SHIFT) & AR71XX_PLL_DIV_MASK) + 1;
freq = div * ref_rate;
div = ((pll >> AR71XX_CPU_DIV_SHIFT) & AR71XX_CPU_DIV_MASK) + 1;
cpu_rate = freq / div;
div = ((pll >> AR71XX_DDR_DIV_SHIFT) & AR71XX_DDR_DIV_MASK) + 1;
ddr_rate = freq / div;
div = (((pll >> AR71XX_AHB_DIV_SHIFT) & AR71XX_AHB_DIV_MASK) + 1) * 2;
ahb_rate = cpu_rate / div;
ath79_add_sys_clkdev("ref", ref_rate);
ath79_add_sys_clkdev("cpu", cpu_rate);
ath79_add_sys_clkdev("ddr", ddr_rate);
ath79_add_sys_clkdev("ahb", ahb_rate);
clk_add_alias("wdt", NULL, "ahb", NULL);
clk_add_alias("uart", NULL, "ahb", NULL);
}
static void __init ar724x_clocks_init(void)
{
unsigned long ref_rate;
unsigned long cpu_rate;
unsigned long ddr_rate;
unsigned long ahb_rate;
u32 pll;
u32 freq;
u32 div;
ref_rate = AR724X_BASE_FREQ;
pll = ath79_pll_rr(AR724X_PLL_REG_CPU_CONFIG);
div = ((pll >> AR724X_PLL_DIV_SHIFT) & AR724X_PLL_DIV_MASK);
freq = div * ref_rate;
div = ((pll >> AR724X_PLL_REF_DIV_SHIFT) & AR724X_PLL_REF_DIV_MASK);
freq *= div;
cpu_rate = freq;
div = ((pll >> AR724X_DDR_DIV_SHIFT) & AR724X_DDR_DIV_MASK) + 1;
ddr_rate = freq / div;
div = (((pll >> AR724X_AHB_DIV_SHIFT) & AR724X_AHB_DIV_MASK) + 1) * 2;
ahb_rate = cpu_rate / div;
ath79_add_sys_clkdev("ref", ref_rate);
ath79_add_sys_clkdev("cpu", cpu_rate);
ath79_add_sys_clkdev("ddr", ddr_rate);
ath79_add_sys_clkdev("ahb", ahb_rate);
clk_add_alias("wdt", NULL, "ahb", NULL);
clk_add_alias("uart", NULL, "ahb", NULL);
}
static void __init ar913x_clocks_init(void)
{
unsigned long ref_rate;
unsigned long cpu_rate;
unsigned long ddr_rate;
unsigned long ahb_rate;
u32 pll;
u32 freq;
u32 div;
ref_rate = AR913X_BASE_FREQ;
pll = ath79_pll_rr(AR913X_PLL_REG_CPU_CONFIG);
div = ((pll >> AR913X_PLL_DIV_SHIFT) & AR913X_PLL_DIV_MASK);
freq = div * ref_rate;
cpu_rate = freq;
div = ((pll >> AR913X_DDR_DIV_SHIFT) & AR913X_DDR_DIV_MASK) + 1;
ddr_rate = freq / div;
div = (((pll >> AR913X_AHB_DIV_SHIFT) & AR913X_AHB_DIV_MASK) + 1) * 2;
ahb_rate = cpu_rate / div;
ath79_add_sys_clkdev("ref", ref_rate);
ath79_add_sys_clkdev("cpu", cpu_rate);
ath79_add_sys_clkdev("ddr", ddr_rate);
ath79_add_sys_clkdev("ahb", ahb_rate);
clk_add_alias("wdt", NULL, "ahb", NULL);
clk_add_alias("uart", NULL, "ahb", NULL);
}
static void __init ar933x_clocks_init(void)
{
unsigned long ref_rate;
unsigned long cpu_rate;
unsigned long ddr_rate;
unsigned long ahb_rate;
u32 clock_ctrl;
u32 cpu_config;
u32 freq;
u32 t;
t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP);
if (t & AR933X_BOOTSTRAP_REF_CLK_40)
ref_rate = (40 * 1000 * 1000);
else
ref_rate = (25 * 1000 * 1000);
clock_ctrl = ath79_pll_rr(AR933X_PLL_CLOCK_CTRL_REG);
if (clock_ctrl & AR933X_PLL_CLOCK_CTRL_BYPASS) {
cpu_rate = ref_rate;
ahb_rate = ref_rate;
ddr_rate = ref_rate;
} else {
cpu_config = ath79_pll_rr(AR933X_PLL_CPU_CONFIG_REG);
t = (cpu_config >> AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
AR933X_PLL_CPU_CONFIG_REFDIV_MASK;
freq = ref_rate / t;
t = (cpu_config >> AR933X_PLL_CPU_CONFIG_NINT_SHIFT) &
AR933X_PLL_CPU_CONFIG_NINT_MASK;
freq *= t;
t = (cpu_config >> AR933X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
AR933X_PLL_CPU_CONFIG_OUTDIV_MASK;
if (t == 0)
t = 1;
freq >>= t;
t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_CPU_DIV_SHIFT) &
AR933X_PLL_CLOCK_CTRL_CPU_DIV_MASK) + 1;
cpu_rate = freq / t;
t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_DDR_DIV_SHIFT) &
AR933X_PLL_CLOCK_CTRL_DDR_DIV_MASK) + 1;
ddr_rate = freq / t;
t = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_AHB_DIV_SHIFT) &
AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK) + 1;
ahb_rate = freq / t;
}
ath79_add_sys_clkdev("ref", ref_rate);
ath79_add_sys_clkdev("cpu", cpu_rate);
ath79_add_sys_clkdev("ddr", ddr_rate);
ath79_add_sys_clkdev("ahb", ahb_rate);
clk_add_alias("wdt", NULL, "ahb", NULL);
clk_add_alias("uart", NULL, "ref", NULL);
}
static u32 __init ar934x_get_pll_freq(u32 ref, u32 ref_div, u32 nint, u32 nfrac,
u32 frac, u32 out_div)
{
u64 t;
u32 ret;
t = ref;
t *= nint;
do_div(t, ref_div);
ret = t;
t = ref;
t *= nfrac;
do_div(t, ref_div * frac);
ret += t;
ret /= (1 << out_div);
return ret;
}
static void __init ar934x_clocks_init(void)
{
unsigned long ref_rate;
unsigned long cpu_rate;
unsigned long ddr_rate;
unsigned long ahb_rate;
u32 pll, out_div, ref_div, nint, nfrac, frac, clk_ctrl, postdiv;
u32 cpu_pll, ddr_pll;
u32 bootstrap;
void __iomem *dpll_base;
dpll_base = ioremap(AR934X_SRIF_BASE, AR934X_SRIF_SIZE);
bootstrap = ath79_reset_rr(AR934X_RESET_REG_BOOTSTRAP);
if (bootstrap & AR934X_BOOTSTRAP_REF_CLK_40)
ref_rate = 40 * 1000 * 1000;
else
ref_rate = 25 * 1000 * 1000;
pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL2_REG);
if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
AR934X_SRIF_DPLL2_OUTDIV_MASK;
pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL1_REG);
nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
AR934X_SRIF_DPLL1_NINT_MASK;
nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
AR934X_SRIF_DPLL1_REFDIV_MASK;
frac = 1 << 18;
} else {
pll = ath79_pll_rr(AR934X_PLL_CPU_CONFIG_REG);
out_div = (pll >> AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
AR934X_PLL_CPU_CONFIG_OUTDIV_MASK;
ref_div = (pll >> AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
AR934X_PLL_CPU_CONFIG_REFDIV_MASK;
nint = (pll >> AR934X_PLL_CPU_CONFIG_NINT_SHIFT) &
AR934X_PLL_CPU_CONFIG_NINT_MASK;
nfrac = (pll >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
AR934X_PLL_CPU_CONFIG_NFRAC_MASK;
frac = 1 << 6;
}
cpu_pll = ar934x_get_pll_freq(ref_rate, ref_div, nint,
nfrac, frac, out_div);
pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL2_REG);
if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
AR934X_SRIF_DPLL2_OUTDIV_MASK;
pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL1_REG);
nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
AR934X_SRIF_DPLL1_NINT_MASK;
nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
AR934X_SRIF_DPLL1_REFDIV_MASK;
frac = 1 << 18;
} else {
pll = ath79_pll_rr(AR934X_PLL_DDR_CONFIG_REG);
out_div = (pll >> AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
AR934X_PLL_DDR_CONFIG_OUTDIV_MASK;
ref_div = (pll >> AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
AR934X_PLL_DDR_CONFIG_REFDIV_MASK;
nint = (pll >> AR934X_PLL_DDR_CONFIG_NINT_SHIFT) &
AR934X_PLL_DDR_CONFIG_NINT_MASK;
nfrac = (pll >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
AR934X_PLL_DDR_CONFIG_NFRAC_MASK;
frac = 1 << 10;
}
ddr_pll = ar934x_get_pll_freq(ref_rate, ref_div, nint,
nfrac, frac, out_div);
clk_ctrl = ath79_pll_rr(AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_SHIFT) &
AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_MASK;
if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_PLL_BYPASS)
cpu_rate = ref_rate;
else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPUCLK_FROM_CPUPLL)
cpu_rate = cpu_pll / (postdiv + 1);
else
cpu_rate = ddr_pll / (postdiv + 1);
postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_SHIFT) &
AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_MASK;
if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_PLL_BYPASS)
ddr_rate = ref_rate;
else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDRCLK_FROM_DDRPLL)
ddr_rate = ddr_pll / (postdiv + 1);
else
ddr_rate = cpu_pll / (postdiv + 1);
postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_SHIFT) &
AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_MASK;
if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_PLL_BYPASS)
ahb_rate = ref_rate;
else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL)
ahb_rate = ddr_pll / (postdiv + 1);
else
ahb_rate = cpu_pll / (postdiv + 1);
ath79_add_sys_clkdev("ref", ref_rate);
ath79_add_sys_clkdev("cpu", cpu_rate);
ath79_add_sys_clkdev("ddr", ddr_rate);
ath79_add_sys_clkdev("ahb", ahb_rate);
clk_add_alias("wdt", NULL, "ref", NULL);
clk_add_alias("uart", NULL, "ref", NULL);
iounmap(dpll_base);
}
static void __init qca955x_clocks_init(void)
{
unsigned long ref_rate;
unsigned long cpu_rate;
unsigned long ddr_rate;
unsigned long ahb_rate;
u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv;
u32 cpu_pll, ddr_pll;
u32 bootstrap;
bootstrap = ath79_reset_rr(QCA955X_RESET_REG_BOOTSTRAP);
if (bootstrap & QCA955X_BOOTSTRAP_REF_CLK_40)
ref_rate = 40 * 1000 * 1000;
else
ref_rate = 25 * 1000 * 1000;
pll = ath79_pll_rr(QCA955X_PLL_CPU_CONFIG_REG);
out_div = (pll >> QCA955X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
QCA955X_PLL_CPU_CONFIG_OUTDIV_MASK;
ref_div = (pll >> QCA955X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
QCA955X_PLL_CPU_CONFIG_REFDIV_MASK;
nint = (pll >> QCA955X_PLL_CPU_CONFIG_NINT_SHIFT) &
QCA955X_PLL_CPU_CONFIG_NINT_MASK;
frac = (pll >> QCA955X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
QCA955X_PLL_CPU_CONFIG_NFRAC_MASK;
cpu_pll = nint * ref_rate / ref_div;
cpu_pll += frac * ref_rate / (ref_div * (1 << 6));
cpu_pll /= (1 << out_div);
pll = ath79_pll_rr(QCA955X_PLL_DDR_CONFIG_REG);
out_div = (pll >> QCA955X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
QCA955X_PLL_DDR_CONFIG_OUTDIV_MASK;
ref_div = (pll >> QCA955X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
QCA955X_PLL_DDR_CONFIG_REFDIV_MASK;
nint = (pll >> QCA955X_PLL_DDR_CONFIG_NINT_SHIFT) &
QCA955X_PLL_DDR_CONFIG_NINT_MASK;
frac = (pll >> QCA955X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
QCA955X_PLL_DDR_CONFIG_NFRAC_MASK;
ddr_pll = nint * ref_rate / ref_div;
ddr_pll += frac * ref_rate / (ref_div * (1 << 10));
ddr_pll /= (1 << out_div);
clk_ctrl = ath79_pll_rr(QCA955X_PLL_CLK_CTRL_REG);
postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) &
QCA955X_PLL_CLK_CTRL_CPU_POST_DIV_MASK;
if (clk_ctrl & QCA955X_PLL_CLK_CTRL_CPU_PLL_BYPASS)
cpu_rate = ref_rate;
else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL)
cpu_rate = ddr_pll / (postdiv + 1);
else
cpu_rate = cpu_pll / (postdiv + 1);
postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) &
QCA955X_PLL_CLK_CTRL_DDR_POST_DIV_MASK;
if (clk_ctrl & QCA955X_PLL_CLK_CTRL_DDR_PLL_BYPASS)
ddr_rate = ref_rate;
else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL)
ddr_rate = cpu_pll / (postdiv + 1);
else
ddr_rate = ddr_pll / (postdiv + 1);
postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) &
QCA955X_PLL_CLK_CTRL_AHB_POST_DIV_MASK;
if (clk_ctrl & QCA955X_PLL_CLK_CTRL_AHB_PLL_BYPASS)
ahb_rate = ref_rate;
else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL)
ahb_rate = ddr_pll / (postdiv + 1);
else
ahb_rate = cpu_pll / (postdiv + 1);
ath79_add_sys_clkdev("ref", ref_rate);
ath79_add_sys_clkdev("cpu", cpu_rate);
ath79_add_sys_clkdev("ddr", ddr_rate);
ath79_add_sys_clkdev("ahb", ahb_rate);
clk_add_alias("wdt", NULL, "ref", NULL);
clk_add_alias("uart", NULL, "ref", NULL);
}
void __init ath79_clocks_init(void)
{
if (soc_is_ar71xx())
ar71xx_clocks_init();
else if (soc_is_ar724x())
ar724x_clocks_init();
else if (soc_is_ar913x())
ar913x_clocks_init();
else if (soc_is_ar933x())
ar933x_clocks_init();
else if (soc_is_ar934x())
ar934x_clocks_init();
else if (soc_is_qca955x())
qca955x_clocks_init();
else
BUG();
}
unsigned long __init
ath79_get_sys_clk_rate(const char *id)
{
struct clk *clk;
unsigned long rate;
clk = clk_get(NULL, id);
if (IS_ERR(clk))
panic("unable to get %s clock, err=%d", id, (int) PTR_ERR(clk));
rate = clk_get_rate(clk);
clk_put(clk);
return rate;
}
/*
* Linux clock API
*/
int clk_enable(struct clk *clk)
{
return 0;
}
EXPORT_SYMBOL(clk_enable);
void clk_disable(struct clk *clk)
{
}
EXPORT_SYMBOL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);