[U-Boot] [PATCH v1 14/21] sparc: Update cpu_init.c to use generic timer infrastructure
Francois Retief
fgretief at spaceteq.co.za
Mon Nov 23 16:38:55 CET 2015
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 at spaceteq.co.za>
---
arch/sparc/cpu/leon2/cpu_init.c | 37 ++++++----
arch/sparc/cpu/leon3/cpu_init.c | 131 ++++++++++++++++++++---------------
arch/sparc/include/asm/config.h | 4 ++
arch/sparc/include/asm/global_data.h | 1 +
arch/sparc/lib/interrupts.c | 5 --
common/board_f.c | 3 +-
6 files changed, 106 insertions(+), 75 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;
diff --git a/common/board_f.c b/common/board_f.c
index b035c90..2dd10b9 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -808,7 +808,8 @@ static init_fnc_t init_sequence_f[] = {
init_timebase,
#endif
#if defined(CONFIG_X86) || defined(CONFIG_ARM) || defined(CONFIG_MIPS) || \
- defined(CONFIG_BLACKFIN) || defined(CONFIG_NDS32)
+ defined(CONFIG_BLACKFIN) || defined(CONFIG_NDS32) || \
+ defined(CONFIG_SPARC)
timer_init, /* initialize timer */
#endif
#ifdef CONFIG_SYS_ALLOC_DPRAM
--
2.4.3
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