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Blackfin: add support for fast SPI reads with Boot ROM

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Newer Blackfin boot roms support using the fast SPI read command rather than
just the slow one.  If the functionality is available, then use it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2008-12-09 17:21:08 -05:00
parent 67619982bf
commit 97f265f14f
1 changed files with 17 additions and 8 deletions
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25
cpu/blackfin/initcode.c
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@ -133,12 +133,22 @@ static inline void serial_putc(char c)
}
/* Max SCLK can be 133MHz ... dividing that by 4 gives
* us a freq of 33MHz for SPI which should generally be
/* Max SCLK can be 133MHz ... dividing that by (2*4) gives
* us a freq of 16MHz for SPI which should generally be
* slow enough for the slow reads the bootrom uses.
*/
#if !defined(CONFIG_SPI_FLASH_SLOW_READ) && \
((defined(__ADSPBF52x__) && __SILICON_REVISION__ >= 2) || \
(defined(__ADSPBF54x__) && __SILICON_REVISION__ >= 1))
# define BOOTROM_SUPPORTS_SPI_FAST_READ 1
#else
# define BOOTROM_SUPPORTS_SPI_FAST_READ 0
#endif
#ifndef CONFIG_SPI_BAUD_INITBLOCK
# define CONFIG_SPI_BAUD_INITBLOCK 4
# define CONFIG_SPI_BAUD_INITBLOCK (BOOTROM_SUPPORTS_SPI_FAST_READ ? 2 : 4)
#endif
#ifdef SPI0_BAUD
# define bfin_write_SPI_BAUD bfin_write_SPI0_BAUD
#endif
/* PLL_DIV defines */
@ -254,12 +264,11 @@ void initcode(ADI_BOOT_DATA *bootstruct)
* boot. Once we switch over to u-boot's SPI flash driver, we'll
* increase the speed appropriately.
*/
if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_SPI_MASTER)
#ifdef SPI0_BAUD
bfin_write_SPI0_BAUD(CONFIG_SPI_BAUD_INITBLOCK);
#else
if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_SPI_MASTER) {
if (BOOTROM_SUPPORTS_SPI_FAST_READ && CONFIG_SPI_BAUD_INITBLOCK < 4)
bootstruct->dFlags |= BFLAG_FASTREAD;
bfin_write_SPI_BAUD(CONFIG_SPI_BAUD_INITBLOCK);
#endif
}
serial_putc('B');