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 <vap...@gentoo.org>
---
cpu/blackfin/initcode.c | 25 +++++++++++++++++--------
1 files changed, 17 insertions(+), 8 deletions(-)
diff --git a/cpu/blackfin/initcode.c b/cpu/blackfin/initcode.c
index a6e95f4..0fdaf40 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');
--
1.6.1.2
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