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openwrt/target/linux/lantiq/patches-3.2/0025-MIPS-lantiq-convert-to...

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From 25db3804c7c9ed3ee5161b00b38de84b1d19f6a8 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Thu, 8 Mar 2012 08:39:06 +0100
Subject: [PATCH 25/70] MIPS: lantiq: convert to clkdev api
* Change setup from HAVE_CLK -> HAVE_MACH_CLKDEV/CLKDEV_LOOKUP
* Add clk_activate/clk_deactivate
* Add better error paths to the clk_*() functions
* Change the way our static clocks are referenced
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/Kconfig | 3 +-
arch/mips/include/asm/mach-lantiq/lantiq.h | 20 ++----
arch/mips/lantiq/clk.c | 96 +++++++++++++++------------
arch/mips/lantiq/clk.h | 52 ++++++++++++++-
arch/mips/lantiq/prom.c | 1 -
5 files changed, 111 insertions(+), 61 deletions(-)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -225,7 +225,8 @@ config LANTIQ
select ARCH_REQUIRE_GPIOLIB
select SWAP_IO_SPACE
select BOOT_RAW
- select HAVE_CLK
+ select HAVE_MACH_CLKDEV
+ select CLKDEV_LOOKUP
select HAVE_OPROFILE
select MIPS_MACHINE
--- a/arch/mips/include/asm/mach-lantiq/lantiq.h
+++ b/arch/mips/include/asm/mach-lantiq/lantiq.h
@@ -9,6 +9,7 @@
#define _LANTIQ_H__
#include <linux/irq.h>
+#include <linux/clk.h>
#include <linux/ioport.h>
/* generic reg access functions */
@@ -22,18 +23,6 @@
extern unsigned int ltq_get_cpu_ver(void);
extern unsigned int ltq_get_soc_type(void);
-/* clock speeds */
-#define CLOCK_60M 60000000
-#define CLOCK_83M 83333333
-#define CLOCK_100M 100000000
-#define CLOCK_111M 111111111
-#define CLOCK_133M 133333333
-#define CLOCK_167M 166666667
-#define CLOCK_200M 200000000
-#define CLOCK_266M 266666666
-#define CLOCK_333M 333333333
-#define CLOCK_400M 400000000
-
/* spinlock all ebu i/o */
extern spinlock_t ebu_lock;
@@ -46,6 +35,13 @@ extern void ltq_disable_irq(struct irq_d
extern void ltq_mask_and_ack_irq(struct irq_data *data);
extern void ltq_enable_irq(struct irq_data *data);
+/* clock handling */
+extern int clk_activate(struct clk *clk);
+extern void clk_deactivate(struct clk *clk);
+extern struct clk *clk_get_cpu(void);
+extern struct clk *clk_get_fpi(void);
+extern struct clk *clk_get_io(void);
+
/* find out what caused the last cpu reset */
extern int ltq_reset_cause(void);
--- a/arch/mips/lantiq/clk.c
+++ b/arch/mips/lantiq/clk.c
@@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/clk.h>
+#include <linux/clkdev.h>
#include <linux/err.h>
#include <linux/list.h>
@@ -24,33 +25,29 @@
#include "clk.h"
#include "prom.h"
-struct clk {
- const char *name;
- unsigned long rate;
- unsigned long (*get_rate) (void);
-};
+/* lantiq socs have 3 static clocks */
+static struct clk cpu_clk_generic[3];
-static struct clk *cpu_clk;
-static int cpu_clk_cnt;
+void clkdev_add_static(unsigned long cpu, unsigned long fpi, unsigned long io)
+{
+ cpu_clk_generic[0].rate = cpu;
+ cpu_clk_generic[1].rate = fpi;
+ cpu_clk_generic[2].rate = io;
+}
-/* lantiq socs have 3 static clocks */
-static struct clk cpu_clk_generic[] = {
- {
- .name = "cpu",
- .get_rate = ltq_get_cpu_hz,
- }, {
- .name = "fpi",
- .get_rate = ltq_get_fpi_hz,
- }, {
- .name = "io",
- .get_rate = ltq_get_io_region_clock,
- },
-};
+struct clk *clk_get_cpu(void)
+{
+ return &cpu_clk_generic[0];
+}
+
+struct clk *clk_get_fpi(void)
+{
+ return &cpu_clk_generic[1];
+}
-void clk_init(void)
+struct clk *clk_get_io(void)
{
- cpu_clk = cpu_clk_generic;
- cpu_clk_cnt = ARRAY_SIZE(cpu_clk_generic);
+ return &cpu_clk_generic[2];
}
static inline int clk_good(struct clk *clk)
@@ -73,36 +70,49 @@ unsigned long clk_get_rate(struct clk *c
}
EXPORT_SYMBOL(clk_get_rate);
-struct clk *clk_get(struct device *dev, const char *id)
+int clk_enable(struct clk *clk)
{
- int i;
+ if (unlikely(!clk_good(clk)))
+ return -1;
- for (i = 0; i < cpu_clk_cnt; i++)
- if (!strcmp(id, cpu_clk[i].name))
- return &cpu_clk[i];
- BUG();
- return ERR_PTR(-ENOENT);
+ if (clk->enable)
+ return clk->enable(clk);
+
+ return -1;
}
-EXPORT_SYMBOL(clk_get);
+EXPORT_SYMBOL(clk_enable);
-void clk_put(struct clk *clk)
+void clk_disable(struct clk *clk)
{
- /* not used */
+ if (unlikely(!clk_good(clk)))
+ return;
+
+ if (clk->disable)
+ clk->disable(clk);
}
-EXPORT_SYMBOL(clk_put);
+EXPORT_SYMBOL(clk_disable);
-int clk_enable(struct clk *clk)
+int clk_activate(struct clk *clk)
{
- /* not used */
- return 0;
+ if (unlikely(!clk_good(clk)))
+ return -1;
+
+ if (clk->activate)
+ return clk->activate(clk);
+
+ return -1;
}
-EXPORT_SYMBOL(clk_enable);
+EXPORT_SYMBOL(clk_activate);
-void clk_disable(struct clk *clk)
+void clk_deactivate(struct clk *clk)
{
- /* not used */
+ if (unlikely(!clk_good(clk)))
+ return;
+
+ if (clk->deactivate)
+ clk->deactivate(clk);
}
-EXPORT_SYMBOL(clk_disable);
+EXPORT_SYMBOL(clk_deactivate);
static inline u32 ltq_get_counter_resolution(void)
{
@@ -126,7 +136,7 @@ void __init plat_time_init(void)
ltq_soc_init();
- clk = clk_get(0, "cpu");
+ clk = clk_get_cpu();
mips_hpt_frequency = clk_get_rate(clk) / ltq_get_counter_resolution();
write_c0_compare(read_c0_count());
pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
--- a/arch/mips/lantiq/clk.h
+++ b/arch/mips/lantiq/clk.h
@@ -9,10 +9,54 @@
#ifndef _LTQ_CLK_H__
#define _LTQ_CLK_H__
-extern void clk_init(void);
+#include <linux/clkdev.h>
-extern unsigned long ltq_get_cpu_hz(void);
-extern unsigned long ltq_get_fpi_hz(void);
-extern unsigned long ltq_get_io_region_clock(void);
+/* clock speeds */
+#define CLOCK_60M 60000000
+#define CLOCK_62_5M 62500000
+#define CLOCK_83M 83333333
+#define CLOCK_83_5M 83500000
+#define CLOCK_98_304M 98304000
+#define CLOCK_100M 100000000
+#define CLOCK_111M 111111111
+#define CLOCK_125M 125000000
+#define CLOCK_133M 133333333
+#define CLOCK_150M 150000000
+#define CLOCK_166M 166666666
+#define CLOCK_167M 166666667
+#define CLOCK_196_608M 196608000
+#define CLOCK_200M 200000000
+#define CLOCK_250M 250000000
+#define CLOCK_266M 266666666
+#define CLOCK_300M 300000000
+#define CLOCK_333M 333333333
+#define CLOCK_393M 393215332
+#define CLOCK_400M 400000000
+#define CLOCK_500M 500000000
+#define CLOCK_600M 600000000
+
+struct clk {
+ struct clk_lookup cl;
+ unsigned long rate;
+ unsigned long (*get_rate) (void);
+ unsigned int module;
+ unsigned int bits;
+ int (*enable) (struct clk *clk);
+ void (*disable) (struct clk *clk);
+ int (*activate) (struct clk *clk);
+ void (*deactivate) (struct clk *clk);
+ void (*reboot) (struct clk *clk);
+};
+
+extern void clkdev_add_static(unsigned long cpu, unsigned long fpi,
+ unsigned long io);
+
+extern unsigned long ltq_danube_cpu_hz(void);
+extern unsigned long ltq_danube_fpi_hz(void);
+extern unsigned long ltq_danube_io_region_clock(void);
+
+extern unsigned long ltq_vr9_cpu_hz(void);
+extern unsigned long ltq_vr9_fpi_hz(void);
+extern unsigned long ltq_vr9_io_region_clock(void);
#endif
--- a/arch/mips/lantiq/prom.c
+++ b/arch/mips/lantiq/prom.c
@@ -103,7 +103,6 @@ EXPORT_SYMBOL(ltq_remap_resource);
void __init prom_init(void)
{
ltq_soc_detect(&soc_info);
- clk_init();
snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev %s",
soc_info.name, soc_info.rev_type);
soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0';
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