MIPS: Alchemy: clock framework integration of onchip clocks

This patch introduces common clock framework integration for all
configurable on-chip clocks on Alchemy chips:

- 2 or 3 PLLs which generate integer multiples of the root rate 12MHz,
- 6 dividers which take one of the 3 PLLs as input and divide their
  rate by either multiples of 2 or 1 (Au1300).
- another bank of up to 6 muxes which take either one of the 6
  above dividers or one of the PLLs directly and divide their rate
  further by 1, 2, 3 or 4.
- a few other sources which are used by onchip peripherals and are
  informational.

This implementation will take the clock tree as it was set up
by boot firmware: all in-kernel boards should continue to work
without having to set up the clock tree in board code.

CLK_IGNORE_DISABLED will be removed once all drivers have been
converted.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/7466/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -72,6 +72,7 @@ config MIPS_ALCHEMY
 	select SYS_SUPPORTS_APM_EMULATION
 	select ARCH_REQUIRE_GPIOLIB
 	select SYS_SUPPORTS_ZBOOT
+	select COMMON_CLK
 
 config AR7
 	bool "Texas Instruments AR7"

arch/mips/alchemy/common/Makefile

@@ -5,8 +5,8 @@
 # Makefile for the Alchemy Au1xx0 CPUs, generic files.
 #
 
-obj-y += prom.o time.o clocks.o platform.o power.o setup.o \
-	sleeper.o dma.o dbdma.o vss.o irq.o usb.o
+obj-y += prom.o time.o clock.o clocks.o platform.o power.o \
+	 setup.o sleeper.o dma.o dbdma.o vss.o irq.o usb.o
 
 # optional gpiolib support
 ifeq ($(CONFIG_ALCHEMY_GPIO_INDIRECT),)

arch/mips/include/asm/mach-au1x00/au1000.h

@@ -47,6 +47,21 @@
 #define ALCHEMY_GPIC_INT_NUM	128
 #define ALCHEMY_GPIC_INT_LAST	(ALCHEMY_GPIC_INT_BASE + ALCHEMY_GPIC_INT_NUM - 1)
 
+/* common clock names, shared among all variants. AUXPLL2 is Au1300 */
+#define ALCHEMY_ROOT_CLK		"root_clk"
+#define ALCHEMY_CPU_CLK			"cpu_clk"
+#define ALCHEMY_AUXPLL_CLK		"auxpll_clk"
+#define ALCHEMY_AUXPLL2_CLK		"auxpll2_clk"
+#define ALCHEMY_SYSBUS_CLK		"sysbus_clk"
+#define ALCHEMY_PERIPH_CLK		"periph_clk"
+#define ALCHEMY_MEM_CLK			"mem_clk"
+#define ALCHEMY_LR_CLK			"lr_clk"
+#define ALCHEMY_FG0_CLK			"fg0_clk"
+#define ALCHEMY_FG1_CLK			"fg1_clk"
+#define ALCHEMY_FG2_CLK			"fg2_clk"
+#define ALCHEMY_FG3_CLK			"fg3_clk"
+#define ALCHEMY_FG4_CLK			"fg4_clk"
+#define ALCHEMY_FG5_CLK			"fg5_clk"
 
 /* Au1300 peripheral interrupt numbers */
 #define AU1300_FIRST_INT	(ALCHEMY_GPIC_INT_BASE)
@@ -523,6 +538,7 @@
 
 #define AU1000_SYS_CPUPLL	0x60
 #define AU1000_SYS_AUXPLL	0x64
+#define AU1300_SYS_AUXPLL2	0x68
 
 
 /**********************************************************************/