From 97f265f14f23050f3cb997f617f3a6917b843ea2 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Tue, 9 Dec 2008 17:21:08 -0500 Subject: [PATCH] Blackfin: add support for fast SPI reads with Boot ROM 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 --- cpu/blackfin/initcode.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/cpu/blackfin/initcode.c b/cpu/blackfin/initcode.c index 71f33759e0..704b791bcb 100644 --- a/cpu/blackfin/initcode.c +++ b/cpu/blackfin/initcode.c @@ -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');