MIPS: lantiq: adds static clock for PP32

The Lantiq DSL SoCs have an internal networking processor. Add code to read
the static clock rate.

Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4815/

arch/mips/include/asm/mach-lantiq/lantiq.h

@@ -41,6 +41,7 @@ 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);
+extern struct clk *clk_get_ppe(void);
 
 /* find out what bootsource we have */
 extern unsigned char ltq_boot_select(void);

arch/mips/lantiq/clk.c

@@ -26,13 +26,15 @@
 #include "prom.h"
 
 /* lantiq socs have 3 static clocks */
-static struct clk cpu_clk_generic[3];
+static struct clk cpu_clk_generic[4];
 
-void clkdev_add_static(unsigned long cpu, unsigned long fpi, unsigned long io)
+void clkdev_add_static(unsigned long cpu, unsigned long fpi,
+			unsigned long io, unsigned long ppe)
 {
 	cpu_clk_generic[0].rate = cpu;
 	cpu_clk_generic[1].rate = fpi;
 	cpu_clk_generic[2].rate = io;
+	cpu_clk_generic[3].rate = ppe;
 }
 
 struct clk *clk_get_cpu(void)
@@ -51,6 +53,12 @@ struct clk *clk_get_io(void)
 	return &cpu_clk_generic[2];
 }
 
+struct clk *clk_get_ppe(void)
+{
+	return &cpu_clk_generic[3];
+}
+EXPORT_SYMBOL_GPL(clk_get_ppe);
+
 static inline int clk_good(struct clk *clk)
 {
 	return clk && !IS_ERR(clk);

arch/mips/lantiq/clk.h

@@ -27,12 +27,15 @@
 #define CLOCK_167M	166666667
 #define CLOCK_196_608M	196608000
 #define CLOCK_200M	200000000
+#define CLOCK_222M	222000000
+#define CLOCK_240M	240000000
 #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_450M	450000000
 #define CLOCK_500M	500000000
 #define CLOCK_600M	600000000
 
@@ -64,15 +67,17 @@ struct clk {
 };
 
 extern void clkdev_add_static(unsigned long cpu, unsigned long fpi,
-				unsigned long io);
+				unsigned long io, unsigned long ppe);
 
 extern unsigned long ltq_danube_cpu_hz(void);
 extern unsigned long ltq_danube_fpi_hz(void);
+extern unsigned long ltq_danube_pp32_hz(void);
 
 extern unsigned long ltq_ar9_cpu_hz(void);
 extern unsigned long ltq_ar9_fpi_hz(void);
 
 extern unsigned long ltq_vr9_cpu_hz(void);
 extern unsigned long ltq_vr9_fpi_hz(void);
+extern unsigned long ltq_vr9_pp32_hz(void);
 
 #endif

arch/mips/lantiq/falcon/sysctrl.c

@@ -241,9 +241,9 @@ void __init ltq_soc_init(void)
 
 	/* get our 3 static rates for cpu, fpi and io clocks */
 	if (ltq_sys1_r32(SYS1_CPU0CC) & CPU0CC_CPUDIV)
-		clkdev_add_static(CLOCK_200M, CLOCK_100M, CLOCK_200M);
+		clkdev_add_static(CLOCK_200M, CLOCK_100M, CLOCK_200M, 0);
 	else
-		clkdev_add_static(CLOCK_400M, CLOCK_100M, CLOCK_200M);
+		clkdev_add_static(CLOCK_400M, CLOCK_100M, CLOCK_200M, 0);
 
 	/* add our clock domains */
 	clkdev_add_sys("1d810000.gpio", SYSCTL_SYSETH, ACTS_P0);

arch/mips/lantiq/xway/clk.c

@@ -53,6 +53,29 @@ unsigned long ltq_danube_cpu_hz(void)
 	}
 }
 
+unsigned long ltq_danube_pp32_hz(void)
+{
+	unsigned int clksys = (ltq_cgu_r32(CGU_SYS) >> 7) & 3;
+	unsigned long clk;
+
+	switch (clksys) {
+	case 1:
+		clk = CLOCK_240M;
+		break;
+	case 2:
+		clk = CLOCK_222M;
+		break;
+	case 3:
+		clk = CLOCK_133M;
+		break;
+	default:
+		clk = CLOCK_266M;
+		break;
+	}
+
+	return clk;
+}
+
 unsigned long ltq_ar9_sys_hz(void)
 {
 	if (((ltq_cgu_r32(CGU_SYS) >> 3) & 0x3) == 0x2)
@@ -149,3 +172,23 @@ unsigned long ltq_vr9_fpi_hz(void)
 
 	return clk;
 }
+
+unsigned long ltq_vr9_pp32_hz(void)
+{
+	unsigned int clksys = (ltq_cgu_r32(CGU_SYS) >> 16) & 3;
+	unsigned long clk;
+
+	switch (clksys) {
+	case 1:
+		clk = CLOCK_450M;
+		break;
+	case 2:
+		clk = CLOCK_300M;
+		break;
+	default:
+		clk = CLOCK_500M;
+		break;
+	}
+
+	return clk;
+}

arch/mips/lantiq/xway/sysctrl.c

@@ -356,14 +356,16 @@ void __init ltq_soc_init(void)
 
 	if (of_machine_is_compatible("lantiq,ase")) {
 		if (ltq_cgu_r32(CGU_SYS) & (1 << 5))
-			clkdev_add_static(CLOCK_266M, CLOCK_133M, CLOCK_133M);
+			clkdev_add_static(CLOCK_266M, CLOCK_133M,
+						CLOCK_133M, CLOCK_266M);
 		else
-			clkdev_add_static(CLOCK_133M, CLOCK_133M, CLOCK_133M);
+			clkdev_add_static(CLOCK_133M, CLOCK_133M,
+						CLOCK_133M, CLOCK_133M);
 		clkdev_add_cgu("1e180000.etop", "ephycgu", CGU_EPHY),
 		clkdev_add_pmu("1e180000.etop", "ephy", 0, PMU_EPHY);
 	} else if (of_machine_is_compatible("lantiq,vr9")) {
 		clkdev_add_static(ltq_vr9_cpu_hz(), ltq_vr9_fpi_hz(),
-				ltq_vr9_fpi_hz());
+				ltq_vr9_fpi_hz(), ltq_vr9_pp32_hz());
 		clkdev_add_pmu("1d900000.pcie", "phy", 1, PMU1_PCIE_PHY);
 		clkdev_add_pmu("1d900000.pcie", "bus", 0, PMU_PCIE_CLK);
 		clkdev_add_pmu("1d900000.pcie", "msi", 1, PMU1_PCIE_MSI);
@@ -376,10 +378,10 @@ void __init ltq_soc_init(void)
 				PMU_PPE_QSB | PMU_PPE_TOP);
 	} else if (of_machine_is_compatible("lantiq,ar9")) {
 		clkdev_add_static(ltq_ar9_cpu_hz(), ltq_ar9_fpi_hz(),
-				ltq_ar9_fpi_hz());
+				ltq_ar9_fpi_hz(), CLOCK_250M);
 		clkdev_add_pmu("1e180000.etop", "switch", 0, PMU_SWITCH);
 	} else {
 		clkdev_add_static(ltq_danube_cpu_hz(), ltq_danube_fpi_hz(),
-				ltq_danube_fpi_hz());
+				ltq_danube_fpi_hz(), ltq_danube_pp32_hz());
 	}
 }