factor out busy_wait_us()

litex/soc/cores/cpu/blackparrot/system.h

@@ -9,6 +9,7 @@ __attribute__((unused)) static void flush_cpu_icache(void){};  /* FIXME: do some
 __attribute__((unused)) static void flush_cpu_dcache(void){};  /* FIXME: do something useful here! */
 void flush_l2_cache(void);
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #include <csr-defs.h>
 

litex/soc/cores/cpu/cv32e40p/system.h

@@ -22,6 +22,7 @@ __attribute__((unused)) static void flush_cpu_dcache(void)
 void flush_l2_cache(void);
 
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #define csrr(reg) ({ unsigned long __tmp; \
   asm volatile ("csrr %0, " #reg : "=r"(__tmp)); \

litex/soc/cores/cpu/lm32/system.h

@@ -27,6 +27,7 @@ __attribute__((unused)) static void flush_cpu_dcache(void)
 void flush_l2_cache(void);
 
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #ifdef __cplusplus
 }

litex/soc/cores/cpu/microwatt/system.h

@@ -13,6 +13,7 @@ static inline void flush_cpu_dcache(void){}; /* FIXME: do something useful here!
 void flush_l2_cache(void);
 
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #ifdef __cplusplus
 }

litex/soc/cores/cpu/minerva/system.h

@@ -9,6 +9,7 @@ __attribute__((unused)) static void flush_cpu_icache(void){}; /* FIXME: do somet
 __attribute__((unused)) static void flush_cpu_dcache(void){}; /* FIXME: do something useful here! */
 void flush_l2_cache(void);
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #include <csr-defs.h>
 

litex/soc/cores/cpu/mor1kx/system.h

@@ -62,6 +62,7 @@ __attribute__((unused)) static void flush_cpu_dcache(void)
 void flush_l2_cache(void);
 
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #ifdef __cplusplus
 }

litex/soc/cores/cpu/picorv32/system.h

@@ -10,6 +10,7 @@ __attribute__((unused)) static void flush_cpu_dcache(void){}; /* No instruction
 void flush_l2_cache(void);
 
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #ifdef __cplusplus
 }

litex/soc/cores/cpu/rocket/system.h

@@ -10,6 +10,7 @@ __attribute__((unused)) static void flush_cpu_dcache(void){}; /* FIXME: do somet
 void flush_l2_cache(void);
 
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #include <csr-defs.h>
 

litex/soc/cores/cpu/serv/system.h

@@ -10,6 +10,7 @@ __attribute__((unused)) static void flush_cpu_dcache(void){}; /* No instruction
 void flush_l2_cache(void);
 
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #ifdef __cplusplus
 }

litex/soc/cores/cpu/vexriscv/system.h

@@ -37,6 +37,7 @@ __attribute__((unused)) static void flush_cpu_dcache(void)
 void flush_l2_cache(void);
 
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #define csrr(reg) ({ unsigned long __tmp; \
   asm volatile ("csrr %0, " #reg : "=r"(__tmp)); \

litex/soc/cores/cpu/vexriscv_smp/system.h

@@ -27,6 +27,7 @@ __attribute__((unused)) static void flush_cpu_dcache(void)
 void flush_l2_cache(void);
 
 void busy_wait(unsigned int ms);
+void busy_wait_us(unsigned int us);
 
 #include <csr-defs.h>
 

litex/soc/software/libbase/system.c

@@ -24,3 +24,13 @@ void busy_wait(unsigned int ms)
 	timer0_update_value_write(1);
 	while(timer0_value_read()) timer0_update_value_write(1);
 }
+
+void busy_wait_us(unsigned int us)
+{
+	timer0_en_write(0);
+	timer0_reload_write(0);
+	timer0_load_write(CONFIG_CLOCK_FREQUENCY/1000000*us);
+	timer0_en_write(1);
+	timer0_update_value_write(1);
+	while(timer0_value_read()) timer0_update_value_write(1);
+}

litex/soc/software/liblitesdcard/sdcard.c

@@ -42,16 +42,6 @@ unsigned int sdcard_response[SD_CMD_RESPONSE_SIZE/4];
 /* SDCard command helpers                                                */
 /*-----------------------------------------------------------------------*/
 
-static void busy_wait_us(unsigned int us)
-{
-    timer0_en_write(0);
-    timer0_reload_write(0);
-    timer0_load_write(CONFIG_CLOCK_FREQUENCY/1000000*us);
-    timer0_en_write(1);
-    timer0_update_value_write(1);
-    while(timer0_value_read()) timer0_update_value_write(1);
-}
-
 int sdcard_wait_cmd_done(void) {
 	unsigned int cmdevt;
 	while (1) {

litex/soc/software/liblitesdcard/spisdcard.c

@@ -123,16 +123,6 @@ static void spisdcardread_bytes(uint8_t* buf, uint16_t n) {
 /* SPI SDCard blocks Xfer functions                                      */
 /*-----------------------------------------------------------------------*/
 
-static void busy_wait_us(unsigned int us)
-{
-    timer0_en_write(0);
-    timer0_reload_write(0);
-    timer0_load_write(CONFIG_CLOCK_FREQUENCY/1000000*us);
-    timer0_en_write(1);
-    timer0_update_value_write(1);
-    while(timer0_value_read()) timer0_update_value_write(1);
-}
-
 static uint8_t spisdcardreceive_block(uint8_t *buf) {
     uint16_t i;
     uint32_t timeout;