sparc: Update cpu_init.c to use generic timer infrastructure

Introduce the CONFIG_SYS_TIMER_* macros in include/asm/config.h to make use
of the generic timer infrastructure in lib/time.c.

Created a timer_init() function to initialize the timer hardware and update
the #ifdef in board_init_f to allow this function to be called during the
start-up sequence.

Signed-off-by: Francois Retief <fgretief@spaceteq.co.za>

5 files changed, 104 insertions, 74 deletions

diff --git a/arch/sparc/cpu/leon2/cpu_init.c b/arch/sparc/cpu/leon2/cpu_init.c
index 5630b09..b4d91e5 100644
--- a/arch/sparc/cpu/leon2/cpu_init.c
+++ b/arch/sparc/cpu/leon2/cpu_init.c
@@ -10,6 +10,7 @@
 #include <common.h>
 #include <asm/asi.h>
 #include <asm/leon.h>
+#include <asm/io.h>
 
 #include <config.h>
 
@@ -54,6 +55,9 @@ void cpu_init_f(void)
 #else
 	leon2->PIO_Interrupt = 0;
 #endif
+
+	/* disable timers */
+	leon2->Timer_Control_1 = leon2->Timer_Control_2 = 0;
 }
 
 int arch_cpu_init(void)
@@ -66,17 +70,11 @@ int arch_cpu_init(void)
 }
 
 /*
- * initialize higher level parts of CPU like time base and timers
+ * initialize higher level parts of CPU
  */
 int cpu_init_r(void)
 {
-	LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
-
-	/* initialize prescaler common to all timers to 1MHz */
-	leon2->Scaler_Counter = leon2->Scaler_Reload =
-	    (((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
-
-	return (0);
+	return 0;
 }
 
 /* Uses Timer 0 to get accurate
@@ -106,11 +104,6 @@ int timer_interrupt_init_cpu(void)
 	return LEON2_TIMER1_IRQNO;
 }
 
-ulong get_tbclk(void)
-{
-	return TIMER_BASE_CLK;
-}
-
 /*
  * This function is intended for SHORT delays only.
  */
@@ -125,3 +118,21 @@ unsigned long cpu_ticks2usec(unsigned long ticks)
 {
 	return ticks * US_PER_TICK;
 }
+
+int timer_init(void)
+{
+	LEON2_regs *leon2 = (LEON2_regs *)LEON2_PREGS;
+
+	/* initialize prescaler common to all timers to 1MHz */
+	leon2->Scaler_Counter = leon2->Scaler_Reload =
+		(((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
+
+	/* SYS_HZ ticks per second */
+	leon2->Timer_Counter_1 = 0;
+	leon2->Timer_Reload_1 = (CONFIG_SYS_TIMER_RATE / CONFIG_SYS_HZ) - 1;
+	leon2->Timer_Control_1 = LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS |
+		LEON2_TIMER_CTRL_LD;
+
+	CONFIG_SYS_TIMER_COUNTER = (void *)&leon2->Timer_Counter_1;
+	return 0;
+}
diff --git a/arch/sparc/cpu/leon3/cpu_init.c b/arch/sparc/cpu/leon3/cpu_init.c
index 9c76657..88f82c9 100644
--- a/arch/sparc/cpu/leon3/cpu_init.c
+++ b/arch/sparc/cpu/leon3/cpu_init.c
@@ -10,6 +10,7 @@
 #include <common.h>
 #include <asm/asi.h>
 #include <asm/leon.h>
+#include <asm/io.h>
 #include <ambapp.h>
 #include <grlib/irqmp.h>
 #include <grlib/gptimer.h>
@@ -22,14 +23,17 @@
 #define CONFIG_AMBAPP_IOAREA AMBA_DEFAULT_IOAREA
 #endif
 
+/* Select which TIMER that will become the time base */
+#ifndef CONFIG_SYS_GRLIB_GPTIMER_INDEX
+#define CONFIG_SYS_GRLIB_GPTIMER_INDEX 0
+#endif
+
 #define TIMER_BASE_CLK 1000000
 #define US_PER_TICK (1000000 / CONFIG_SYS_HZ)
 
 DECLARE_GLOBAL_DATA_PTR;
 
 ambapp_dev_irqmp *irqmp = NULL;
-ambapp_dev_gptimer *gptimer = NULL;
-unsigned int gptimer_irq = 0;
 
 /*
  * Breath some life into the CPU...
@@ -59,6 +63,9 @@ static unsigned int snoop_detect(void)
 
 int arch_cpu_init(void)
 {
+	ambapp_apbdev apbdev;
+	int index;
+
 	gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
 	gd->bus_clk = CONFIG_SYS_CLK_FREQ;
 	gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
@@ -70,6 +77,35 @@ int arch_cpu_init(void)
 	 */
 	ambapp_bus_init(CONFIG_AMBAPP_IOAREA, CONFIG_SYS_CLK_FREQ, &ambapp_plb);
 
+	/* Initialize/clear all the timers in the system.
+	 */
+	for (index = 0; ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER,
+		GAISLER_GPTIMER, index, &apbdev) == 1; index++) {
+		ambapp_dev_gptimer *timer;
+		unsigned int bus_freq;
+		int i, ntimers;
+
+		timer = (ambapp_dev_gptimer *)apbdev.address;
+
+		/* Different buses may have different frequency, the
+		 * frequency of the bus tell in which frequency the timer
+		 * prescaler operates.
+		 */
+		bus_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
+
+		/* Initialize prescaler common to all timers to 1MHz */
+		timer->scalar = timer->scalar_reload =
+			(((bus_freq / 1000) + 500) / 1000) - 1;
+
+		/* Clear all timers */
+		ntimers = timer->config & 0x7;
+		for (i = 0; i < ntimers; i++) {
+			timer->e[i].ctrl = GPTIMER_CTRL_IP;
+			timer->e[i].rld = 0;
+			timer->e[i].ctrl = GPTIMER_CTRL_LD;
+		}
+	}
+
 	return 0;
 }
 
@@ -79,9 +115,7 @@ int arch_cpu_init(void)
 int cpu_init_r(void)
 {
 	ambapp_apbdev apbdev;
-	int index, cpu, ntimers, i;
-	ambapp_dev_gptimer *timer = NULL;
-	unsigned int bus_freq;
+	int cpu;
 
 	/*
 	 * Find AMBA APB IRQMP Controller,
@@ -104,40 +138,6 @@ int cpu_init_r(void)
 		irqmp->cpu_force[cpu] = 0;
 	}
 
-	/* timer */
-	index = 0;
-	while (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER, GAISLER_GPTIMER,
-		index, &apbdev) == 1) {
-		timer = (ambapp_dev_gptimer *)apbdev.address;
-		if (gptimer == NULL) {
-			gptimer = timer;
-			gptimer_irq = apbdev.irq;
-		}
-
-		/* Different buses may have different frequency, the
-		 * frequency of the bus tell in which frequency the timer
-		 * prescaler operates.
-		 */
-		bus_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
-
-		/* initialize prescaler common to all timers to 1MHz */
-		timer->scalar = timer->scalar_reload =
-		    (((bus_freq / 1000) + 500) / 1000) - 1;
-
-		/* Clear All Timers */
-		ntimers = timer->config & 0x7;
-		for (i = 0; i < ntimers; i++) {
-			timer->e[i].ctrl = GPTIMER_CTRL_IP;
-			timer->e[i].rld = 0;
-			timer->e[i].ctrl = GPTIMER_CTRL_LD;
-		}
-
-		index++;
-	}
-	if (!gptimer) {
-		printf("%s: gptimer not found!\n", __func__);
-		return 1;
-	}
 	return 0;
 }
 
@@ -151,25 +151,9 @@ void cpu_wait_ticks(unsigned long ticks)
 	while (get_timer(start) < ticks) ;
 }
 
-/* initiate and setup timer0 interrupt to configured HZ. Base clock is 1MHz.
- * Return irq number for timer int or a negative number for
- * dealing with self
- */
 int timer_interrupt_init_cpu(void)
 {
-	/* SYS_HZ ticks per second */
-	gptimer->e[0].val = 0;
-	gptimer->e[0].rld = (TIMER_BASE_CLK / CONFIG_SYS_HZ) - 1;
-	gptimer->e[0].ctrl =
-	    (GPTIMER_CTRL_EN | GPTIMER_CTRL_RS |
-	     GPTIMER_CTRL_LD | GPTIMER_CTRL_IE);
-
-	return gptimer_irq;
-}
-
-ulong get_tbclk(void)
-{
-	return TIMER_BASE_CLK;
+	return -1;
 }
 
 /*
@@ -186,3 +170,38 @@ unsigned long cpu_ticks2usec(unsigned long ticks)
 {
 	return ticks * US_PER_TICK;
 }
+
+int timer_init(void)
+{
+	ambapp_dev_gptimer_element *tmr;
+	ambapp_dev_gptimer *gptimer;
+	ambapp_apbdev apbdev;
+	unsigned bus_freq;
+
+	if (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER, GAISLER_GPTIMER,
+		CONFIG_SYS_GRLIB_GPTIMER_INDEX, &apbdev) != 1) {
+		panic("%s: gptimer not found!\n", __func__);
+		return -1;
+	}
+
+	gptimer = (ambapp_dev_gptimer *) apbdev.address;
+
+	/* Different buses may have different frequency, the
+	 * frequency of the bus tell in which frequency the timer
+	 * prescaler operates.
+	 */
+	bus_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
+
+	/* initialize prescaler common to all timers to 1MHz */
+	gptimer->scalar = gptimer->scalar_reload =
+		(((bus_freq / 1000) + 500) / 1000) - 1;
+
+	tmr = (ambapp_dev_gptimer_element *)&gptimer->e[0];
+
+	tmr->val = 0;
+	tmr->rld = ~0;
+	tmr->ctrl = GPTIMER_CTRL_EN | GPTIMER_CTRL_RS | GPTIMER_CTRL_LD;
+
+	CONFIG_SYS_TIMER_COUNTER = (void *)&tmr->val;
+	return 0;
+}
diff --git a/arch/sparc/include/asm/config.h b/arch/sparc/include/asm/config.h
index c884b25..455fbc1 100644
--- a/arch/sparc/include/asm/config.h
+++ b/arch/sparc/include/asm/config.h
@@ -14,4 +14,8 @@
 #define CONFIG_LMB
 #define CONFIG_SYS_BOOT_RAMDISK_HIGH
 
+#define CONFIG_SYS_TIMER_RATE		1000000		/* 1MHz */
+#define CONFIG_SYS_TIMER_COUNTER	gd->arch.timer
+#define CONFIG_SYS_TIMER_COUNTS_DOWN
+
 #endif
diff --git a/arch/sparc/include/asm/global_data.h b/arch/sparc/include/asm/global_data.h
index 8c6557a..af38d17 100644
--- a/arch/sparc/include/asm/global_data.h
+++ b/arch/sparc/include/asm/global_data.h
@@ -15,6 +15,7 @@
 
 /* Architecture-specific global data */
 struct arch_global_data {
+	void *timer;
 	void *uart;
 	unsigned int uart_freq;
 #ifdef CONFIG_LEON3
diff --git a/arch/sparc/lib/interrupts.c b/arch/sparc/lib/interrupts.c
index b8f2efb..fab26c6 100644
--- a/arch/sparc/lib/interrupts.c
+++ b/arch/sparc/lib/interrupts.c
@@ -81,11 +81,6 @@ void timer_interrupt(struct pt_regs *regs)
 	timestamp++;
 }
 
-ulong get_timer(ulong base)
-{
-	return (timestamp - base);
-}
-
 void timer_interrupt_init(void)
 {
 	int irq;