diff options
author | Florian Fainelli <florian@openwrt.org> | 2010-01-27 09:10:06 +0100 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2010-02-27 12:53:16 +0100 |
commit | 780019ddf02f214ad61e641b57b8ac30c837e2a7 (patch) | |
tree | 2d0a01efc4d508057bcfaa7b3df5b3e490c249ed /arch/mips/ar7/clock.c | |
parent | 5f3c909881d5deebb9a3ddc836a15937e76daefc (diff) | |
download | linux-stable-780019ddf02f214ad61e641b57b8ac30c837e2a7.tar.gz linux-stable-780019ddf02f214ad61e641b57b8ac30c837e2a7.tar.bz2 linux-stable-780019ddf02f214ad61e641b57b8ac30c837e2a7.zip |
MIPS: AR7: Implement clock API
This patch makes the ar7 clock code implement the Linux clk API. Drivers
using the various clocks available in the SoC are updated accordingly.
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Acked-by: Wim Van Sebroeck <wim@iguana.be>
To: linux-mips@linux-mips.org
Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: netdev@vger.kernel.org
Cc: David Miller <davem@davemloft.net>
Patchwork: http://patchwork.linux-mips.org/patch/881/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/ar7/clock.c')
-rw-r--r-- | arch/mips/ar7/clock.c | 109 |
1 files changed, 80 insertions, 29 deletions
diff --git a/arch/mips/ar7/clock.c b/arch/mips/ar7/clock.c index cc65c8eb391b..fc0e7154e8d6 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; } |