diff options
| author | Steven King <sfking@fdwdc.com> | 2012-06-06 14:28:31 -0700 |
|---|---|---|
| committer | Greg Ungerer <gerg@uclinux.org> | 2012-07-16 09:59:21 +1000 |
| commit | bea8bcb12da09bd35cdada395d0d0db1aee2ba4c (patch) | |
| tree | 0a62830f7538f8ab83c75fa4c445643adc258350 /arch/m68k/platform/coldfire/clk.c | |
| parent | bdee4e26ba6568118f2376ebcfdeef3b7f527bce (diff) | |
m68knommu: Add support for the Coldfire m5441x.
Add support for the Coldfire 5441x (54410/54415/54416/54417/54418). Currently
we only support noMMU mode. It requires the PIT patch posted previously as it
uses the PIT instead of the dma timer as a clock source so we can get all that
GENERIC_CLOCKEVENTS goodness. It also adds some simple clk definitions and
very simple minded power management. The gpio code is tweeked and some
additional devices are added to devices.c. The Makefile uses -mv4e as
apparently, the only difference a v4m (m5441x) and a v4e is the later has a
FPU, which I don't think should matter to us in the kernel.
Signed-off-by: Steven King <sfking@fdwdc.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Diffstat (limited to 'arch/m68k/platform/coldfire/clk.c')
| -rw-r--r-- | arch/m68k/platform/coldfire/clk.c | 105 |
1 files changed, 104 insertions, 1 deletions
diff --git a/arch/m68k/platform/coldfire/clk.c b/arch/m68k/platform/coldfire/clk.c index 44da406897e..c06c0f4a0ff 100644 --- a/arch/m68k/platform/coldfire/clk.c +++ b/arch/m68k/platform/coldfire/clk.c @@ -10,11 +10,17 @@ #include <linux/kernel.h> #include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> #include <linux/clk.h> +#include <linux/io.h> +#include <linux/err.h> #include <asm/coldfire.h> +#include <asm/mcfsim.h> +#include <asm/mcfclk.h> /***************************************************************************/ - +#ifndef MCFPM_PPMCR0 struct clk *clk_get(struct device *dev, const char *id) { return NULL; @@ -49,4 +55,101 @@ struct clk *devm_clk_get(struct device *dev, const char *id) } EXPORT_SYMBOL(devm_clk_get); +#else +static DEFINE_SPINLOCK(clk_lock); + +struct clk *clk_get(struct device *dev, const char *id) +{ + const char *clk_name = dev ? dev_name(dev) : id ? id : NULL; + struct clk *clk; + unsigned i; + + for (i = 0; (clk = mcf_clks[i]) != NULL; ++i) + if (!strcmp(clk->name, clk_name)) + return clk; + pr_warn("clk_get: didn't find clock %s\n", clk_name); + return ERR_PTR(-ENOENT); +} +EXPORT_SYMBOL(clk_get); + +int clk_enable(struct clk *clk) +{ + unsigned long flags; + spin_lock_irqsave(&clk_lock, flags); + if ((clk->enabled++ == 0) && clk->clk_ops) + clk->clk_ops->enable(clk); + spin_unlock_irqrestore(&clk_lock, flags); + + return 0; +} +EXPORT_SYMBOL(clk_enable); + +void clk_disable(struct clk *clk) +{ + unsigned long flags; + spin_lock_irqsave(&clk_lock, flags); + if ((--clk->enabled == 0) && clk->clk_ops) + clk->clk_ops->disable(clk); + spin_unlock_irqrestore(&clk_lock, flags); +} +EXPORT_SYMBOL(clk_disable); + +void clk_put(struct clk *clk) +{ + if (clk->enabled != 0) + pr_warn("clk_put %s still enabled\n", clk->name); +} +EXPORT_SYMBOL(clk_put); + +unsigned long clk_get_rate(struct clk *clk) +{ + return clk->rate; +} +EXPORT_SYMBOL(clk_get_rate); + /***************************************************************************/ + +void __clk_init_enabled(struct clk *clk) +{ + clk->enabled = 1; + clk->clk_ops->enable(clk); +} + +void __clk_init_disabled(struct clk *clk) +{ + clk->enabled = 0; + clk->clk_ops->disable(clk); +} + +static void __clk_enable0(struct clk *clk) +{ + __raw_writeb(clk->slot, MCFPM_PPMCR0); +} + +static void __clk_disable0(struct clk *clk) +{ + __raw_writeb(clk->slot, MCFPM_PPMSR0); +} + +struct clk_ops clk_ops0 = { + .enable = __clk_enable0, + .disable = __clk_disable0, +}; + +#ifdef MCFPM_PPMCR1 +static void __clk_enable1(struct clk *clk) +{ + __raw_writeb(clk->slot, MCFPM_PPMCR1); +} + +static void __clk_disable1(struct clk *clk) +{ + __raw_writeb(clk->slot, MCFPM_PPMSR1); +} + +struct clk_ops clk_ops1 = { + .enable = __clk_enable1, + .disable = __clk_disable1, +}; +#endif /* MCFPM_PPMCR1 */ +#endif /* MCFPM_PPMCR0 */ |