sh: clkfwk: Rework legacy CPG clock handling.

This moves out the old legacy CPG clocks to their own file, and converts
over the existing users. With these clocks going away and each CPU
dealing with them on their own, CPUs can gradually move over to the new
interface.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

13 files changed, 110 insertions, 63 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index fb75c2d1928d..d7990cd2f8d4 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -513,6 +513,9 @@ config SH_PCLK_FREQ
           This is necessary for determining the reference clock value on
           platforms lacking an RTC.
 
+config SH_CLK_CPG_LEGACY
+        def_bool y
+
 config SH_CLK_MD
         int "CPU Mode Pin Setting"
         depends on CPU_SH2
diff --git a/arch/sh/include/asm/clock.h b/arch/sh/include/asm/clock.h
index e2f5bf1b4a9c..c27e844db0de 100644
--- a/arch/sh/include/asm/clock.h
+++ b/arch/sh/include/asm/clock.h
@@ -47,7 +47,7 @@ struct clk_lookup {
 #define CLK_ENABLE_ON_INIT      (1 << 0)
 
 /* Should be defined by processor-specific code */
-void arch_init_clk_ops(struct clk_ops **, int type);
+void __deprecated arch_init_clk_ops(struct clk_ops **, int type);
 int __init arch_clk_init(void);
 
 /* arch/sh/kernel/cpu/clock.c */
@@ -59,6 +59,9 @@ int clk_reparent(struct clk *child, struct clk *parent);
 int clk_register(struct clk *);
 void clk_unregister(struct clk *);
 
+/* arch/sh/kernel/cpu/clock-cpg.c */
+int __init __deprecated cpg_clk_init(void);
+
 /* the exported API, in addition to clk_set_rate */
 /**
  * clk_set_rate_ex - set the clock rate for a clock source, with additional parameter
diff --git a/arch/sh/include/asm/machvec.h b/arch/sh/include/asm/machvec.h
index 64b1c16a0f03..73d6d16fa06b 100644
--- a/arch/sh/include/asm/machvec.h
+++ b/arch/sh/include/asm/machvec.h
@@ -46,6 +46,8 @@ struct sh_machine_vector {
 
         void __iomem *(*mv_ioport_map)(unsigned long port, unsigned int size);
         void (*mv_ioport_unmap)(void __iomem *);
+
+        int (*mv_clk_init)(void);
 };
 
 extern struct sh_machine_vector sh_mv;
diff --git a/arch/sh/kernel/cpu/Makefile b/arch/sh/kernel/cpu/Makefile
index 2600641a483f..05105b980c21 100644
--- a/arch/sh/kernel/cpu/Makefile
+++ b/arch/sh/kernel/cpu/Makefile
@@ -17,5 +17,6 @@ obj-$(CONFIG_ARCH_SHMOBILE)	+= shmobile/
 
 obj-$(CONFIG_UBC_WAKEUP)        += ubc.o
 obj-$(CONFIG_SH_ADC)            += adc.o
+obj-$(CONFIG_SH_CLK_CPG_LEGACY) += clock-cpg.o
 
 obj-y   += irq/ init.o clock.o
diff --git a/arch/sh/kernel/cpu/clock-cpg.c b/arch/sh/kernel/cpu/clock-cpg.c
new file mode 100644
index 000000000000..b4ca20048446
--- /dev/null
+++ b/arch/sh/kernel/cpu/clock-cpg.c
@@ -0,0 +1,60 @@
+#include <linux/clk.h>
+#include <linux/compiler.h>
+#include <asm/clock.h>
+
+static struct clk master_clk = {
+        .name           = "master_clk",
+        .flags          = CLK_ENABLE_ON_INIT,
+        .rate           = CONFIG_SH_PCLK_FREQ,
+};
+
+static struct clk peripheral_clk = {
+        .name           = "peripheral_clk",
+        .parent         = &master_clk,
+        .flags          = CLK_ENABLE_ON_INIT,
+};
+
+static struct clk bus_clk = {
+        .name           = "bus_clk",
+        .parent         = &master_clk,
+        .flags          = CLK_ENABLE_ON_INIT,
+};
+
+static struct clk cpu_clk = {
+        .name           = "cpu_clk",
+        .parent         = &master_clk,
+        .flags          = CLK_ENABLE_ON_INIT,
+};
+
+/*
+ * The ordering of these clocks matters, do not change it.
+ */
+static struct clk *onchip_clocks[] = {
+        &master_clk,
+        &peripheral_clk,
+        &bus_clk,
+        &cpu_clk,
+};
+
+int __init __deprecated cpg_clk_init(void)
+{
+        int i, ret = 0;
+
+        for (i = 0; i < ARRAY_SIZE(onchip_clocks); i++) {
+                struct clk *clk = onchip_clocks[i];
+                arch_init_clk_ops(&clk->ops, i);
+                if (clk->ops)
+                        ret |= clk_register(clk);
+        }
+
+        return ret;
+}
+
+/*
+ * Placeholder for compatability, until the lazy CPUs do this
+ * on their own.
+ */
+int __init __weak arch_clk_init(void)
+{
+        return cpg_clk_init();
+}
diff --git a/arch/sh/kernel/cpu/clock.c b/arch/sh/kernel/cpu/clock.c
index 0a7755cc8a25..033f4662b59d 100644
--- a/arch/sh/kernel/cpu/clock.c
+++ b/arch/sh/kernel/cpu/clock.c
@@ -30,54 +30,12 @@
 #include <linux/platform_device.h>
 #include <linux/proc_fs.h>
 #include <asm/clock.h>
+#include <asm/machvec.h>
 
 static LIST_HEAD(clock_list);
 static DEFINE_SPINLOCK(clock_lock);
 static DEFINE_MUTEX(clock_list_sem);
 
-/*
- * Each subtype is expected to define the init routines for these clocks,
- * as each subtype (or processor family) will have these clocks at the
- * very least. These are all provided through the CPG, which even some of
- * the more quirky parts (such as ST40, SH4-202, etc.) still have.
- *
- * The processor-specific code is expected to register any additional
- * clock sources that are of interest.
- */
-static struct clk master_clk = {
-        .name           = "master_clk",
-        .flags          = CLK_ENABLE_ON_INIT,
-        .rate           = CONFIG_SH_PCLK_FREQ,
-};
-
-static struct clk peripheral_clk = {
-        .name           = "peripheral_clk",
-        .parent         = &master_clk,
-        .flags          = CLK_ENABLE_ON_INIT,
-};
-
-static struct clk bus_clk = {
-        .name           = "bus_clk",
-        .parent         = &master_clk,
-        .flags          = CLK_ENABLE_ON_INIT,
-};
-
-static struct clk cpu_clk = {
-        .name           = "cpu_clk",
-        .parent         = &master_clk,
-        .flags          = CLK_ENABLE_ON_INIT,
-};
-
-/*
- * The ordering of these clocks matters, do not change it.
- */
-static struct clk *onchip_clocks[] = {
-        &master_clk,
-        &peripheral_clk,
-        &bus_clk,
-        &cpu_clk,
-};
-
 /* Used for clocks that always have same value as the parent clock */
 unsigned long followparent_recalc(struct clk *clk)
 {
@@ -443,10 +401,6 @@ void clk_put(struct clk *clk)
 }
 EXPORT_SYMBOL_GPL(clk_put);
 
-int __init __weak arch_clk_init(void)
-{
-        return 0;
-}
 
 static int show_clocks(char *buf, char **start, off_t off,
                        int len, int *eof, void *data)
@@ -533,18 +487,22 @@ subsys_initcall(clk_sysdev_init);
 
 int __init clk_init(void)
 {
-        int i, ret = 0;
-
-        BUG_ON(!master_clk.rate);
-
-        for (i = 0; i < ARRAY_SIZE(onchip_clocks); i++) {
-                struct clk *clk = onchip_clocks[i];
+        int ret;
 
-                arch_init_clk_ops(&clk->ops, i);
-                ret |= clk_register(clk);
+        ret = arch_clk_init();
+        if (unlikely(ret)) {
+                pr_err("%s: CPU clock registration failed.\n", __func__);
+                return ret;
         }
 
-        ret |= arch_clk_init();
+        if (sh_mv.mv_clk_init) {
+                ret = sh_mv.mv_clk_init();
+                if (unlikely(ret)) {
+                        pr_err("%s: machvec clock initialization failed.\n",
+                               __func__);
+                        return ret;
+                }
+        }
 
         /* Kick the child clocks.. */
         recalculate_root_clocks();
diff --git a/arch/sh/kernel/cpu/sh4/clock-sh4-202.c b/arch/sh/kernel/cpu/sh4/clock-sh4-202.c
index a72dc326d0b3..21421e34e7d5 100644
--- a/arch/sh/kernel/cpu/sh4/clock-sh4-202.c
+++ b/arch/sh/kernel/cpu/sh4/clock-sh4-202.c
@@ -152,9 +152,12 @@ static struct clk *sh4202_onchip_clocks[] = {
 
 int __init arch_clk_init(void)
 {
-        struct clk *clk = clk_get(NULL, "master_clk");
+        struct clk *clk;
         int i, ret = 0;
 
+        cpg_clk_init();
+
+        clk = clk_get(NULL, "master_clk");
         for (i = 0; i < ARRAY_SIZE(sh4202_onchip_clocks); i++) {
                 struct clk *clkp = sh4202_onchip_clocks[i];
 
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7722.c b/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
index 426065b43269..a98d7da67b97 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
@@ -892,6 +892,8 @@ int __init arch_clk_init(void)
         struct clk *clk;
         int i;
 
+        clk_cpg_init();
+
         clk = clk_get(NULL, "master_clk");
         for (i = 0; i < ARRAY_SIZE(sh7722_clocks); i++) {
                 pr_debug( "Registering clock '%s'\n", sh7722_clocks[i]->name);
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7763.c b/arch/sh/kernel/cpu/sh4a/clock-sh7763.c
index ce3d4e6319a3..370cd47642ef 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7763.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7763.c
@@ -92,9 +92,12 @@ static struct clk *sh7763_onchip_clocks[] = {
 
 int __init arch_clk_init(void)
 {
-        struct clk *clk = clk_get(NULL, "master_clk");
+        struct clk *clk;
         int i, ret = 0;
 
+        cpg_clk_init();
+
+        clk = clk_get(NULL, "master_clk");
         for (i = 0; i < ARRAY_SIZE(sh7763_onchip_clocks); i++) {
                 struct clk *clkp = sh7763_onchip_clocks[i];
 
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7780.c b/arch/sh/kernel/cpu/sh4a/clock-sh7780.c
index 38b8b1ddb283..a249d823578e 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7780.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7780.c
@@ -98,9 +98,12 @@ static struct clk *sh7780_onchip_clocks[] = {
 
 int __init arch_clk_init(void)
 {
-        struct clk *clk = clk_get(NULL, "master_clk");
+        struct clk *clk;
         int i, ret = 0;
 
+        cpg_clk_init();
+
+        clk = clk_get(NULL, "master_clk");
         for (i = 0; i < ARRAY_SIZE(sh7780_onchip_clocks); i++) {
                 struct clk *clkp = sh7780_onchip_clocks[i];
 
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7785.c b/arch/sh/kernel/cpu/sh4a/clock-sh7785.c
index fa14f35bc116..bf5a0dacf8e5 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7785.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7785.c
@@ -136,9 +136,12 @@ static struct clk *sh7785_onchip_clocks[] = {
 
 int __init arch_clk_init(void)
 {
-        struct clk *clk = clk_get(NULL, "master_clk");
+        struct clk *clk;
         int i, ret = 0;
 
+        cpg_clk_init();
+
+        clk = clk_get(NULL, "master_clk");
         for (i = 0; i < ARRAY_SIZE(sh7785_onchip_clocks); i++) {
                 struct clk *clkp = sh7785_onchip_clocks[i];
 
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7786.c b/arch/sh/kernel/cpu/sh4a/clock-sh7786.c
index 7907002fa1df..a0e8869071ac 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7786.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7786.c
@@ -122,9 +122,12 @@ static struct clk *sh7786_onchip_clocks[] = {
 
 int __init arch_clk_init(void)
 {
-        struct clk *clk = clk_get(NULL, "master_clk");
+        struct clk *clk;
         int i, ret = 0;
 
+        cpg_clk_init();
+
+        clk = clk_get(NULL, "master_clk");
         for (i = 0; i < ARRAY_SIZE(sh7786_onchip_clocks); i++) {
                 struct clk *clkp = sh7786_onchip_clocks[i];
 
diff --git a/arch/sh/kernel/cpu/sh4a/clock-shx3.c b/arch/sh/kernel/cpu/sh4a/clock-shx3.c
index c14553e3e13f..23c27d32d982 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-shx3.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-shx3.c
@@ -109,9 +109,12 @@ static struct clk *shx3_onchip_clocks[] = {
 
 int __init arch_clk_init(void)
 {
-        struct clk *clk = clk_get(NULL, "master_clk");
+        struct clk *clk;
         int i, ret = 0;
 
+        cpg_clk_init();
+
+        clk = clk_get(NULL, "master_clk");
         for (i = 0; i < ARRAY_SIZE(shx3_onchip_clocks); i++) {
                 struct clk *clkp = shx3_onchip_clocks[i];