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SAMV7 MCAN: Add some definitions for the PCK5 clock source and prescaler

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This commit is contained in:
Gregory Nutt 2015-07-31 11:24:29 -06:00
parent 70f6e1e8bb
commit 6c9e8b5092
2 changed files with 54 additions and 0 deletions
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26
arch/arm/src/samv7/Kconfig
View File

@ -1309,6 +1309,32 @@ if SAMV7_MCAN
menu "MCAN device driver options"
choice
prompt "MCAN clock source (PCK5)"
default SAMV7_MCAN_CLKSRC_MAIN
config SAMV7_MCAN_CLKSRC_SLOW
bool "Slow clock"
config SAMV7_MCAN_CLKSRC_MAIN
bool "Main clock"
config SAMV7_MCAN_CLKSRC_PLLA
bool "PLLA clock"
config SAMV7_MCAN_CLKSRC_UPLL
bool "UPLL clock"
config SAMV7_MCAN_CLKSRC_MCK
bool "Master clock"
endchoice # MCAN clock source
config SAMV7_MCAN_CLKSRC_PRESCALER
int "MCAN clock prescaler"
default 1
range 1 256
if SAMV7_MCAN0
config SAMV7_MCAN0_BAUD

28
arch/arm/src/samv7/sam_mcan.c
View File

@ -76,6 +76,34 @@
# define MAX(a,b) ((a > b) ? a : b)
#endif
/* Clock source *************************************************************/
/* PCK5 is the programmable clock source, common to all MCAN controllers */
#if defined(CONFIG_SAMV7_MCAN_CLKSRC_SLOW)
# define SAMV7_MCAN_CLKSRC PMC_PCK_CSS_SLOW
# define SAMV7_MCAN_CLKSRC_FREQUENCY BOARD_SLOWCLK_FREQUENCY
#elif defined(CONFIG_SAMV7_MCAN_CLKSRC_PLLA)
# define SAMV7_MCAN_CLKSRC PMC_PCK_CSS_PLLA
# define SAMV7_MCAN_CLKSRC_FREQUENCY BOARD_PLLA_FREQUENCY
#elif defined(CONFIG_SAMV7_MCAN_CLKSRC_UPLL)
# define SAMV7_MCAN_CLKSRC PMC_PCK_CSS_UPLL
# define SAMV7_MCAN_CLKSRC_FREQUENCY BOARD_UPLL_FREQUENCY
#elif defined(CONFIG_SAMV7_MCAN_CLKSRC_MCK)
# define SAMV7_MCAN_CLKSRC PMC_PCK_CSS_MCK
# define SAMV7_MCAN_CLKSRC_FREQUENCY BOARD_MCK_FREQUENCY
#else /* if defined(CONFIG_SAMV7_MCAN_CLKSRC_MAIN */
# define SAMV7_MCAN_CLKSRC PMC_PCK_CSS_MAIN
# define SAMV7_MCAN_CLKSRC_FREQUENCY BOARD_MAINOSC_FREQUENCY
#endif
#ifndef CONFIG_SAMV7_MCAN_CLKSRC_PRESCALER
# define CONFIG_SAMV7_MCAN_CLKSRC_PRESCALER 1
#endif
#define SAMV7_MCANCLK_FREQUENCY \
(SAMV7_MCAN_CLKSRC_FREQUENCY / CONFIG_SAMV7_MCAN_CLKSRC_PRESCALER)
/* Mailboxes ****************************************************************/
#define SAMV7_MCAN_NRECVMB MAX(CONFIG_SAMV7_MCAN0_NRECVMB, CONFIG_SAMV7_MCAN1_NRECVMB)