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Diffstat (limited to 'arch/mips/ar7/clock.c')
-rw-r--r--arch/mips/ar7/clock.c109
1 files changed, 80 insertions, 29 deletions
diff --git a/arch/mips/ar7/clock.c b/arch/mips/ar7/clock.c
index cc65c8eb391..fc0e7154e8d 100644
--- a/arch/mips/ar7/clock.c
+++ b/arch/mips/ar7/clock.c
@@ -1,6 +1,7 @@
/*
* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
+ * Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
*
* 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
@@ -24,6 +25,8 @@
#include <linux/delay.h>
#include <linux/gcd.h>
#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/clk.h>
#include <asm/addrspace.h>
#include <asm/mach-ar7/ar7.h>
@@ -94,12 +97,16 @@ struct tnetd7200_clocks {
struct tnetd7200_clock usb;
};
-int ar7_cpu_clock = 150000000;
-EXPORT_SYMBOL(ar7_cpu_clock);
-int ar7_bus_clock = 125000000;
-EXPORT_SYMBOL(ar7_bus_clock);
-int ar7_dsp_clock;
-EXPORT_SYMBOL(ar7_dsp_clock);
+static struct clk bus_clk = {
+ .rate = 125000000,
+};
+
+static struct clk cpu_clk = {
+ .rate = 150000000,
+};
+
+static struct clk dsp_clk;
+static struct clk vbus_clk;
static void approximate(int base, int target, int *prediv,
int *postdiv, int *mul)
@@ -185,7 +192,7 @@ static int tnetd7300_get_clock(u32 shift, struct tnetd7300_clock *clock,
base_clock = AR7_XTAL_CLOCK;
break;
case BOOT_PLL_SOURCE_CPU:
- base_clock = ar7_cpu_clock;
+ base_clock = cpu_clk.rate;
break;
}
@@ -212,11 +219,11 @@ static void tnetd7300_set_clock(u32 shift, struct tnetd7300_clock *clock,
u32 *bootcr, u32 frequency)
{
int prediv, postdiv, mul;
- int base_clock = ar7_bus_clock;
+ int base_clock = bus_clk.rate;
switch ((*bootcr & (BOOT_PLL_SOURCE_MASK << shift)) >> shift) {
case BOOT_PLL_SOURCE_BUS:
- base_clock = ar7_bus_clock;
+ base_clock = bus_clk.rate;
break;
case BOOT_PLL_SOURCE_REF:
base_clock = AR7_REF_CLOCK;
@@ -225,7 +232,7 @@ static void tnetd7300_set_clock(u32 shift, struct tnetd7300_clock *clock,
base_clock = AR7_XTAL_CLOCK;
break;
case BOOT_PLL_SOURCE_CPU:
- base_clock = ar7_cpu_clock;
+ base_clock = cpu_clk.rate;
break;
}
@@ -247,18 +254,18 @@ static void __init tnetd7300_init_clocks(void)
ioremap_nocache(UR8_REGS_CLOCKS,
sizeof(struct tnetd7300_clocks));
- ar7_bus_clock = tnetd7300_get_clock(BUS_PLL_SOURCE_SHIFT,
+ bus_clk.rate = tnetd7300_get_clock(BUS_PLL_SOURCE_SHIFT,
&clocks->bus, bootcr, AR7_AFE_CLOCK);
if (*bootcr & BOOT_PLL_ASYNC_MODE)
- ar7_cpu_clock = tnetd7300_get_clock(CPU_PLL_SOURCE_SHIFT,
+ cpu_clk.rate = tnetd7300_get_clock(CPU_PLL_SOURCE_SHIFT,
&clocks->cpu, bootcr, AR7_AFE_CLOCK);
else
- ar7_cpu_clock = ar7_bus_clock;
+ cpu_clk.rate = bus_clk.rate;
- if (ar7_dsp_clock == 250000000)
+ if (dsp_clk.rate == 250000000)
tnetd7300_set_clock(DSP_PLL_SOURCE_SHIFT, &clocks->dsp,
- bootcr, ar7_dsp_clock);
+ bootcr, dsp_clk.rate);
iounmap(clocks);
iounmap(bootcr);
@@ -343,20 +350,20 @@ static void __init tnetd7200_init_clocks(void)
printk(KERN_INFO "Clocks: Setting DSP clock\n");
calculate(dsp_base, TNETD7200_DEF_DSP_CLK,
&dsp_prediv, &dsp_postdiv, &dsp_mul);
- ar7_bus_clock =
+ bus_clk.rate =
((dsp_base / dsp_prediv) * dsp_mul) / dsp_postdiv;
tnetd7200_set_clock(dsp_base, &clocks->dsp,
dsp_prediv, dsp_postdiv * 2, dsp_postdiv, dsp_mul * 2,
- ar7_bus_clock);
+ bus_clk.rate);
printk(KERN_INFO "Clocks: Setting CPU clock\n");
calculate(cpu_base, TNETD7200_DEF_CPU_CLK, &cpu_prediv,
&cpu_postdiv, &cpu_mul);
- ar7_cpu_clock =
+ cpu_clk.rate =
((cpu_base / cpu_prediv) * cpu_mul) / cpu_postdiv;
tnetd7200_set_clock(cpu_base, &clocks->cpu,
cpu_prediv, cpu_postdiv, -1, cpu_mul,
- ar7_cpu_clock);
+ cpu_clk.rate);
} else
if (*bootcr & BOOT_PLL_2TO1_MODE) {
@@ -365,48 +372,90 @@ static void __init tnetd7200_init_clocks(void)
printk(KERN_INFO "Clocks: Setting CPU clock\n");
calculate(cpu_base, TNETD7200_DEF_CPU_CLK, &cpu_prediv,
&cpu_postdiv, &cpu_mul);
- ar7_cpu_clock = ((cpu_base / cpu_prediv) * cpu_mul)
+ cpu_clk.rate = ((cpu_base / cpu_prediv) * cpu_mul)
/ cpu_postdiv;
tnetd7200_set_clock(cpu_base, &clocks->cpu,
cpu_prediv, cpu_postdiv, -1, cpu_mul,
- ar7_cpu_clock);
+ cpu_clk.rate);
printk(KERN_INFO "Clocks: Setting DSP clock\n");
calculate(dsp_base, TNETD7200_DEF_DSP_CLK, &dsp_prediv,
&dsp_postdiv, &dsp_mul);
- ar7_bus_clock = ar7_cpu_clock / 2;
+ bus_clk.rate = cpu_clk.rate / 2;
tnetd7200_set_clock(dsp_base, &clocks->dsp,
dsp_prediv, dsp_postdiv * 2, dsp_postdiv,
- dsp_mul * 2, ar7_bus_clock);
+ dsp_mul * 2, bus_clk.rate);
} else {
printk(KERN_INFO "Clocks: Sync 1:1 mode\n");
printk(KERN_INFO "Clocks: Setting DSP clock\n");
calculate(dsp_base, TNETD7200_DEF_DSP_CLK, &dsp_prediv,
&dsp_postdiv, &dsp_mul);
- ar7_bus_clock = ((dsp_base / dsp_prediv) * dsp_mul)
+ bus_clk.rate = ((dsp_base / dsp_prediv) * dsp_mul)
/ dsp_postdiv;
tnetd7200_set_clock(dsp_base, &clocks->dsp,
dsp_prediv, dsp_postdiv * 2, dsp_postdiv,
- dsp_mul * 2, ar7_bus_clock);
+ dsp_mul * 2, bus_clk.rate);
- ar7_cpu_clock = ar7_bus_clock;
+ cpu_clk.rate = bus_clk.rate;
}
printk(KERN_INFO "Clocks: Setting USB clock\n");
- usb_base = ar7_bus_clock;
+ usb_base = bus_clk.rate;
calculate(usb_base, TNETD7200_DEF_USB_CLK, &usb_prediv,
&usb_postdiv, &usb_mul);
tnetd7200_set_clock(usb_base, &clocks->usb,
usb_prediv, usb_postdiv, -1, usb_mul,
TNETD7200_DEF_USB_CLK);
- ar7_dsp_clock = ar7_cpu_clock;
+ dsp_clk.rate = cpu_clk.rate;
iounmap(clocks);
iounmap(bootcr);
}
+/*
+ * 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);
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+ if (!strcmp(id, "bus"))
+ return &bus_clk;
+ /* cpmac and vbus share the same rate */
+ if (!strcmp(id, "cpmac"))
+ return &vbus_clk;
+ if (!strcmp(id, "cpu"))
+ return &cpu_clk;
+ if (!strcmp(id, "dsp"));
+ return &dsp_clk;
+ if (!strcmp(id, "vbus"))
+ return &vbus_clk;
+ return ERR_PTR(-ENOENT);
+}
+EXPORT_SYMBOL(clk_get);
+
+void clk_put(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_put);
+
int __init ar7_init_clocks(void)
{
switch (ar7_chip_id()) {
@@ -415,12 +464,14 @@ int __init ar7_init_clocks(void)
tnetd7200_init_clocks();
break;
case AR7_CHIP_7300:
- ar7_dsp_clock = tnetd7300_dsp_clock();
+ dsp_clk.rate = tnetd7300_dsp_clock();
tnetd7300_init_clocks();
break;
default:
break;
}
+ /* adjust vbus clock rate */
+ vbus_clk.rate = bus_clk.rate / 2;
return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-08 18:50:27 +0000