diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/mach-versatile/clock.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/arm/mach-versatile/clock.c')
-rw-r--r-- | arch/arm/mach-versatile/clock.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/arch/arm/mach-versatile/clock.c b/arch/arm/mach-versatile/clock.c new file mode 100644 index 000000000000..48025c2b9987 --- /dev/null +++ b/arch/arm/mach-versatile/clock.c @@ -0,0 +1,145 @@ +/* + * linux/arch/arm/mach-versatile/clock.c + * + * Copyright (C) 2004 ARM Limited. + * Written by Deep Blue Solutions Limited. + * + * 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/module.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/err.h> + +#include <asm/semaphore.h> +#include <asm/hardware/clock.h> +#include <asm/hardware/icst307.h> + +#include "clock.h" + +static LIST_HEAD(clocks); +static DECLARE_MUTEX(clocks_sem); + +struct clk *clk_get(struct device *dev, const char *id) +{ + struct clk *p, *clk = ERR_PTR(-ENOENT); + + down(&clocks_sem); + list_for_each_entry(p, &clocks, node) { + if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) { + clk = p; + break; + } + } + up(&clocks_sem); + + return clk; +} +EXPORT_SYMBOL(clk_get); + +void clk_put(struct clk *clk) +{ + module_put(clk->owner); +} +EXPORT_SYMBOL(clk_put); + +int clk_enable(struct clk *clk) +{ + return 0; +} +EXPORT_SYMBOL(clk_enable); + +void clk_disable(struct clk *clk) +{ +} +EXPORT_SYMBOL(clk_disable); + +int clk_use(struct clk *clk) +{ + return 0; +} +EXPORT_SYMBOL(clk_use); + +void clk_unuse(struct clk *clk) +{ +} +EXPORT_SYMBOL(clk_unuse); + +unsigned long clk_get_rate(struct clk *clk) +{ + return clk->rate; +} +EXPORT_SYMBOL(clk_get_rate); + +long clk_round_rate(struct clk *clk, unsigned long rate) +{ + return rate; +} +EXPORT_SYMBOL(clk_round_rate); + +int clk_set_rate(struct clk *clk, unsigned long rate) +{ + int ret = -EIO; + + if (clk->setvco) { + struct icst307_vco vco; + + vco = icst307_khz_to_vco(clk->params, rate / 1000); + clk->rate = icst307_khz(clk->params, vco) * 1000; + + printk("Clock %s: setting VCO reg params: S=%d R=%d V=%d\n", + clk->name, vco.s, vco.r, vco.v); + + clk->setvco(clk, vco); + ret = 0; + } + return ret; +} +EXPORT_SYMBOL(clk_set_rate); + +/* + * These are fixed clocks. + */ +static struct clk kmi_clk = { + .name = "KMIREFCLK", + .rate = 24000000, +}; + +static struct clk uart_clk = { + .name = "UARTCLK", + .rate = 24000000, +}; + +static struct clk mmci_clk = { + .name = "MCLK", + .rate = 33000000, +}; + +int clk_register(struct clk *clk) +{ + down(&clocks_sem); + list_add(&clk->node, &clocks); + up(&clocks_sem); + return 0; +} +EXPORT_SYMBOL(clk_register); + +void clk_unregister(struct clk *clk) +{ + down(&clocks_sem); + list_del(&clk->node); + up(&clocks_sem); +} +EXPORT_SYMBOL(clk_unregister); + +static int __init clk_init(void) +{ + clk_register(&kmi_clk); + clk_register(&uart_clk); + clk_register(&mmci_clk); + return 0; +} +arch_initcall(clk_init); |