ARM: Add the clock framework for Telechips TCC8xxx processors.

This adds definitions and low-level functions to handle clocks in
TCC8xxx processors.

Signed-off-by: "Hans J. Koch" <hjk@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 76 insertions, 10 deletions

diff --git a/arch/arm/plat-tcc/include/mach/clkdev.h b/arch/arm/plat-tcc/include/mach/clkdev.h
new file mode 100644
index 000000000000..04b37a89801c
--- /dev/null
+++ b/arch/arm/plat-tcc/include/mach/clkdev.h
@@ -0,0 +1,7 @@
+#ifndef __ASM_MACH_CLKDEV_H
+#define __ASM_MACH_CLKDEV_H
+
+#define __clk_get(clk) ({ 1; })
+#define __clk_put(clk) do { } while (0)
+
+#endif
diff --git a/arch/arm/plat-tcc/include/mach/clock.h b/arch/arm/plat-tcc/include/mach/clock.h
new file mode 100644
index 000000000000..a12f58ad71a8
--- /dev/null
+++ b/arch/arm/plat-tcc/include/mach/clock.h
@@ -0,0 +1,48 @@
+/*
+ * Low level clock header file for Telechips TCC architecture
+ * (C) 2010 Hans J. Koch <hjk@linutronix.de>
+ *
+ * Licensed under the GPL v2.
+ */
+
+#ifndef __ASM_ARCH_TCC_CLOCK_H__
+#define __ASM_ARCH_TCC_CLOCK_H__
+
+#ifndef __ASSEMBLY__
+
+struct clk {
+        struct clk *parent;
+        /* id number of a root clock, 0 for normal clocks */
+        int root_id;
+        /* Reference count of clock enable/disable */
+        int refcount;
+        /* Address of associated BCLKCTRx register. Must be set. */
+        void __iomem *bclkctr;
+        /* Bit position for BCLKCTRx. Must be set. */
+        int bclk_shift;
+        /* Address of ACLKxxx register, if any. */
+        void __iomem *aclkreg;
+        /* get the current clock rate (always a fresh value) */
+        unsigned long (*get_rate) (struct clk *);
+        /* Function ptr to set the clock to a new rate. The rate must match a
+           supported rate returned from round_rate. Leave blank if clock is not
+           programmable */
+        int (*set_rate) (struct clk *, unsigned long);
+        /* Function ptr to round the requested clock rate to the nearest
+           supported rate that is less than or equal to the requested rate. */
+        unsigned long (*round_rate) (struct clk *, unsigned long);
+        /* Function ptr to enable the clock. Leave blank if clock can not
+           be gated. */
+        int (*enable) (struct clk *);
+        /* Function ptr to disable the clock. Leave blank if clock can not
+           be gated. */
+        void (*disable) (struct clk *);
+        /* Function ptr to set the parent clock of the clock. */
+        int (*set_parent) (struct clk *, struct clk *);
+};
+
+int clk_register(struct clk *clk);
+void clk_unregister(struct clk *clk);
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ASM_ARCH_MXC_CLOCK_H__ */
diff --git a/arch/arm/plat-tcc/include/mach/tcc8k-regs.h b/arch/arm/plat-tcc/include/mach/tcc8k-regs.h
index f3243ebea463..1d9428295332 100644
--- a/arch/arm/plat-tcc/include/mach/tcc8k-regs.h
+++ b/arch/arm/plat-tcc/include/mach/tcc8k-regs.h
@@ -30,13 +30,13 @@
 #define EXT_MEM_CTRL_BASE       0xf0000000
 #define EXT_MEM_CTRL_SIZE       SZ_4K
 
-#define CS1_BASE_VIRT           0xf7000000
-#define AHB_PERI_BASE_VIRT      0xf4000000
-#define APB0_PERI_BASE_VIRT     0xf1000000
-#define APB1_PERI_BASE_VIRT     0xf2000000
-#define EXT_MEM_CTRL_BASE_VIRT  0xf3000000
-#define INT_SRAM_BASE_VIRT      0xf5000000
-#define DATA_TCM_BASE_VIRT      0xf6000000
+#define CS1_BASE_VIRT           (void __iomem *)0xf7000000
+#define AHB_PERI_BASE_VIRT      (void __iomem *)0xf4000000
+#define APB0_PERI_BASE_VIRT     (void __iomem *)0xf1000000
+#define APB1_PERI_BASE_VIRT     (void __iomem *)0xf2000000
+#define EXT_MEM_CTRL_BASE_VIRT  (void __iomem *)0xf3000000
+#define INT_SRAM_BASE_VIRT      (void __iomem *)0xf5000000
+#define DATA_TCM_BASE_VIRT      (void __iomem *)0xf6000000
 
 #define __REG(x)     (*((volatile u32 *)(x)))
 
@@ -649,8 +649,7 @@
 #define PMGPIO_APB_OFFS         0x800
 
 /* Clock controller registers */
-#define CKC_BASE                (APB1_PERI_BASE_VIRT + 0x6000)
-#define CKC_BASE_PHYS           (APB1_PERI_BASE + 0x6000)
+#define CKC_BASE        ((void __iomem *)(APB1_PERI_BASE_VIRT + 0x6000))
 
 #define CLKCTRL_OFFS            0x00
 #define PLL0CFG_OFFS            0x04
@@ -724,8 +723,20 @@
 /* SWRESET1 bits */
 #define SWRESET1_USBH1          (1 << 20)
 
-/* System clock sources */
+/* System clock sources.
+ * Note: These are the clock sources that serve as parents for
+ * all other clocks. They have no parents themselves.
+ *
+ * These values are used for struct clk->root_id. All clocks
+ * that are not system clock sources have this value set to
+ * CLK_SRC_NOROOT.
+ * The values for system clocks start with CLK_SRC_PLL0 == 0
+ * because this gives us exactly the values needed for the lower
+ * 4 bits of ACLK_* registers. Therefore, CLK_SRC_NOROOT is
+ * defined as -1 to not disturb the order.
+ */
 enum root_clks {
+        CLK_SRC_NOROOT = -1,
         CLK_SRC_PLL0 = 0,
         CLK_SRC_PLL1,
         CLK_SRC_PLL0DIV,