diff options
author | Marc Singer <elf@buici.com> | 2006-05-16 10:41:28 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-06-18 15:16:45 (GMT) |
commit | 638b266630db8d492255d340e18d46ba6ab1b057 (patch) | |
tree | 305dbef19f1bbec6daaec98a52d38c15d47d3824 /arch/arm/mach-lh7a40x/clocks.c | |
parent | 2295196c30ea686389519f699f0ccbfbc5c3b94c (diff) | |
download | linux-638b266630db8d492255d340e18d46ba6ab1b057.tar.xz |
[ARM] 3401/1: lpd7a40x: platform update
Patch from Marc Singer
Updates to the lpd7a40x_platform files. Includes support for new
architecture, lpd7a400.
Signed-off-by: Marc Singer <elf@buici.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-lh7a40x/clocks.c')
-rw-r--r-- | arch/arm/mach-lh7a40x/clocks.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/arch/arm/mach-lh7a40x/clocks.c b/arch/arm/mach-lh7a40x/clocks.c new file mode 100644 index 0000000..2291afe9 --- /dev/null +++ b/arch/arm/mach-lh7a40x/clocks.c @@ -0,0 +1,199 @@ +/* arch/arm/mach-lh7a40x/clocks.c + * + * Copyright (C) 2004 Marc Singer + * + * 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/config.h> +#include <linux/cpufreq.h> +#include <asm/hardware.h> +#include <asm/arch/clocks.h> +#include <linux/err.h> + +struct module; +struct icst525_params; + +struct clk { + struct list_head node; + unsigned long rate; + struct module *owner; + const char *name; +// void *data; +// const struct icst525_params *params; +// void (*setvco)(struct clk *, struct icst525_vco vco); +}; + +int clk_register(struct clk *clk); +void clk_unregister(struct clk *clk); + +/* ----- */ + +#define MAINDIV1(c) (((c) >> 7) & 0x0f) +#define MAINDIV2(c) (((c) >> 11) & 0x1f) +#define PS(c) (((c) >> 18) & 0x03) +#define PREDIV(c) (((c) >> 2) & 0x1f) +#define HCLKDIV(c) (((c) >> 0) & 0x02) +#define PCLKDIV(c) (((c) >> 16) & 0x03) + +unsigned int cpufreq_get (unsigned int cpu) /* in kHz */ +{ + return fclkfreq_get ()/1000; +} +EXPORT_SYMBOL(cpufreq_get); + +unsigned int fclkfreq_get (void) +{ + unsigned int clkset = CSC_CLKSET; + unsigned int gclk + = XTAL_IN + / (1 << PS(clkset)) + * (MAINDIV1(clkset) + 2) + / (PREDIV(clkset) + 2) + * (MAINDIV2(clkset) + 2) + ; + return gclk; +} + +unsigned int hclkfreq_get (void) +{ + unsigned int clkset = CSC_CLKSET; + unsigned int hclk = fclkfreq_get () / (HCLKDIV(clkset) + 1); + + return hclk; +} + +unsigned int pclkfreq_get (void) +{ + unsigned int clkset = CSC_CLKSET; + int pclkdiv = PCLKDIV(clkset); + unsigned int pclk; + if (pclkdiv == 0x3) + pclkdiv = 0x2; + pclk = hclkfreq_get () / (1 << pclkdiv); + + return pclk; +} + +/* ----- */ + +static LIST_HEAD(clocks); +static DECLARE_MUTEX(clocks_sem); + +struct clk *clk_get (struct device *dev, const char *id) +{ + struct clk *p; + struct clk *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; + return ret; +} +EXPORT_SYMBOL(clk_set_rate); + +#if 0 +/* + * 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, +}; +#endif + +static struct clk clcd_clk = { + .name = "CLCDCLK", + .rate = 0, +}; + +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(&clcd_clk); + return 0; +} +arch_initcall(clk_init); |