ARM: vexpress: Initial common clock support

This patch makes Versatile Express use the common clock framework
instead of the plat-versatile implementation.

It defines clock provider for VE's OSCs (clock generators) and
registers all required fixed and variable clock sources (for both
motherboard and core tile).

This is a simple conversion of the existing state and will be
extended (and migrated to drivers/clk) in the near future.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>

arch/arm/Kconfig

@@ -310,14 +310,13 @@ config ARCH_VEXPRESS
 	select ARM_AMBA
 	select ARM_TIMER_SP804
 	select CLKDEV_LOOKUP
-	select HAVE_MACH_CLKDEV
+	select COMMON_CLK
 	select GENERIC_CLOCKEVENTS
 	select HAVE_CLK
 	select HAVE_PATA_PLATFORM
 	select ICST
 	select NO_IOPORT
 	select PLAT_VERSATILE
-	select PLAT_VERSATILE_CLOCK
 	select PLAT_VERSATILE_CLCD
 	help
 	  This enables support for the ARM Ltd Versatile Express boards.

arch/arm/mach-vexpress/ct-ca9x4.c

@@ -112,45 +112,11 @@ static struct amba_device *ct_ca9x4_amba_devs[] __initdata = {
 };
 
 
-static long ct_round(struct clk *clk, unsigned long rate)
-{
-	return rate;
-}
-
-static int ct_set(struct clk *clk, unsigned long rate)
-{
-	u32 site = v2m_get_master_site();
-
-	return v2m_cfg_write(SYS_CFG_OSC | SYS_CFG_SITE(site) | 1, rate);
-}
-
-static const struct clk_ops osc1_clk_ops = {
-	.round	= ct_round,
-	.set	= ct_set,
-};
-
-static struct clk osc1_clk = {
-	.ops	= &osc1_clk_ops,
-	.rate	= 24000000,
-};
-
-static struct clk ct_sp804_clk = {
-	.rate	= 1000000,
-};
-
-static struct clk_lookup lookups[] = {
-	{	/* CLCD */
-		.dev_id		= "ct:clcd",
-		.clk		= &osc1_clk,
-	}, {	/* SP804 timers */
-		.dev_id		= "sp804",
-		.con_id		= "ct-timer0",
-		.clk		= &ct_sp804_clk,
-	}, {	/* SP804 timers */
-		.dev_id		= "sp804",
-		.con_id		= "ct-timer1",
-		.clk		= &ct_sp804_clk,
-	},
+static struct v2m_osc ct_osc1 = {
+	.osc = 1,
+	.rate_min = 10000000,
+	.rate_max = 80000000,
+	.rate_default = 23750000,
 };
 
 static struct resource pmu_resources[] = {
@@ -183,14 +149,10 @@ static struct platform_device pmu_device = {
 	.resource	= pmu_resources,
 };
 
-static void __init ct_ca9x4_init_early(void)
-{
-	clkdev_add_table(lookups, ARRAY_SIZE(lookups));
-}
-
 static void __init ct_ca9x4_init(void)
 {
 	int i;
+	struct clk *clk;
 
 #ifdef CONFIG_CACHE_L2X0
 	void __iomem *l2x0_base = ioremap(CT_CA9X4_L2CC, SZ_4K);
@@ -202,6 +164,10 @@ static void __init ct_ca9x4_init(void)
 	l2x0_init(l2x0_base, 0x00400000, 0xfe0fffff);
 #endif
 
+	ct_osc1.site = v2m_get_master_site();
+	clk = v2m_osc_register("ct:osc1", &ct_osc1);
+	clk_register_clkdev(clk, NULL, "ct:clcd");
+
 	for (i = 0; i < ARRAY_SIZE(ct_ca9x4_amba_devs); i++)
 		amba_device_register(ct_ca9x4_amba_devs[i], &iomem_resource);
 
@@ -243,7 +209,6 @@ struct ct_desc ct_ca9x4_desc __initdata = {
 	.id		= V2M_CT_ID_CA9,
 	.name		= "CA9x4",
 	.map_io		= ct_ca9x4_map_io,
-	.init_early	= ct_ca9x4_init_early,
 	.init_irq	= ct_ca9x4_init_irq,
 	.init_tile	= ct_ca9x4_init,
 #ifdef CONFIG_SMP

arch/arm/mach-vexpress/include/mach/motherboard.h

@@ -1,6 +1,8 @@
 #ifndef __MACH_MOTHERBOARD_H
 #define __MACH_MOTHERBOARD_H
 
+#include <linux/clk-provider.h>
+
 /*
  * Physical addresses, offset from V2M_PA_CS0-3
  */
@@ -147,4 +149,21 @@ struct ct_desc {
 
 extern struct ct_desc *ct_desc;
 
+/*
+ * OSC clock provider
+ */
+struct v2m_osc {
+	struct clk_hw hw;
+	u8 site; /* 0 = motherboard, 1 = site 1, 2 = site 2 */
+	u8 stack; /* board stack position */
+	u16 osc;
+	unsigned long rate_min;
+	unsigned long rate_max;
+	unsigned long rate_default;
+};
+
+#define to_v2m_osc(osc) container_of(osc, struct v2m_osc, hw)
+
+struct clk *v2m_osc_register(const char *name, struct v2m_osc *osc);
+
 #endif