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blackfin: add spi and i2c specific get clock functions

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Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
This commit is contained in:
Sonic Zhang 2014-01-28 13:53:34 +08:00 committed by Heiko Schocher
parent bb0fad0ea0
commit d6a320d5bb
5 changed files with 21 additions and 14 deletions
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7
arch/blackfin/include/asm/blackfin_local.h
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@ -42,13 +42,6 @@
# include <linux/types.h>
extern u_long get_vco(void);
extern u_long get_cclk(void);
extern u_long get_sclk(void);
extern u_long get_sclk0(void);
extern u_long get_sclk1(void);
extern u_long get_dclk(void);
# define bfin_revid() (bfin_read_CHIPID() >> 28)
extern int bfin_os_log_check(void);

11
arch/blackfin/include/asm/clock.h
View File

@ -68,10 +68,21 @@ static inline uint32_t early_get_uart_clk(void)
return uclk;
}
extern u_long get_vco(void);
extern u_long get_cclk(void);
extern u_long get_sclk(void);
#ifdef CGU_DIV
extern u_long get_sclk0(void);
extern u_long get_sclk1(void);
extern u_long get_dclk(void);
# define get_uart_clk get_sclk0
# define get_i2c_clk get_sclk0
# define get_spi_clk get_sclk0
#else
# define get_uart_clk get_sclk
# define get_i2c_clk get_sclk
# define get_spi_clk get_sclk
#endif
#endif

3
drivers/i2c/bfin-twi_i2c.c
View File

@ -10,6 +10,7 @@
#include <i2c.h>
#include <asm/blackfin.h>
#include <asm/clock.h>
#include <asm/mach-common/bits/twi.h>
/* Every register is 32bit aligned, but only 16bits in size */
@ -274,7 +275,7 @@ unsigned int i2c_get_bus_speed(void)
*/
void i2c_init(int speed, int slaveaddr)
{
uint8_t prescale = ((get_sclk() / 1000 / 1000 + 5) / 10) & 0x7F;
uint8_t prescale = ((get_i2c_clk() / 1000 / 1000 + 5) / 10) & 0x7F;
/* Set TWI internal clock as 10MHz */
twi->control = prescale;

7
drivers/spi/bfin_spi.c
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@ -13,6 +13,7 @@
#include <spi.h>
#include <asm/blackfin.h>
#include <asm/clock.h>
#include <asm/gpio.h>
#include <asm/portmux.h>
#include <asm/mach-common/bits/spi.h>
@ -140,12 +141,12 @@ static const unsigned short cs_pins[][7] = {
void spi_set_speed(struct spi_slave *slave, uint hz)
{
struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
ulong sclk;
ulong clk;
u32 baud;
sclk = get_sclk();
clk = get_spi_clk();
/* baud should be rounded up */
baud = DIV_ROUND_UP(sclk, 2 * hz);
baud = DIV_ROUND_UP(clk, 2 * hz);
if (baud < 2)
baud = 2;
else if (baud > (u16)-1)

7
drivers/spi/bfin_spi6xx.c
View File

@ -22,6 +22,7 @@
#include <spi.h>
#include <asm/blackfin.h>
#include <asm/clock.h>
#include <asm/gpio.h>
#include <asm/portmux.h>
#include <asm/mach-common/bits/spi6xx.h>
@ -135,11 +136,11 @@ static const unsigned short cs_pins[][7] = {
void spi_set_speed(struct spi_slave *slave, uint hz)
{
struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
ulong sclk;
ulong clk;
u32 clock;
sclk = get_sclk1();
clock = sclk / hz;
clk = get_spi_clk();
clock = clk / hz;
if (clock)
clock--;
bss->clock = clock;