[PATCH] pxa2xx-spi update

Fix some outstanding issues with the pxa2xx_spi driver when running on a
PXA270:

- Wrong timeout calculation in the setup function due to different
  peripheral clock rates in the PXAxxx family.

- Bad handling of SSSR_TFS interrupts in interrupt_transfer function.

- Added locking to interface between the pump_messages workqueue and the
  pump_transfers tasklet.

Much thanks to Juergen Beisert for the extensive testing on the PXA270.

Signed-off-by: Stephen Street <stephen@streetfiresound.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/asm-arm/arch-pxa/pxa2xx_spi.h b/include/asm-arm/arch-pxa/pxa2xx_spi.h
index 1e70908b816f..915590c391c8 100644
--- a/include/asm-arm/arch-pxa/pxa2xx_spi.h
+++ b/include/asm-arm/arch-pxa/pxa2xx_spi.h
@@ -27,13 +27,16 @@
 #define SSP1_SerClkDiv(x) (((CLOCK_SPEED_HZ/2/(x+1))<<8)&0x0000ff00)
 #define SSP2_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
 #define SSP3_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
+#define SSP_TIMEOUT_SCALE (2712)
 #elif defined(CONFIG_PXA27x)
 #define CLOCK_SPEED_HZ 13000000
 #define SSP1_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
 #define SSP2_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
 #define SSP3_SerClkDiv(x) (((CLOCK_SPEED_HZ/(x+1))<<8)&0x000fff00)
+#define SSP_TIMEOUT_SCALE (769)
 #endif
 
+#define SSP_TIMEOUT(x) ((x*10000)/SSP_TIMEOUT_SCALE)
 #define SSP1_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(1)))))
 #define SSP2_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(2)))))
 #define SSP3_VIRT ((void *)(io_p2v(__PREG(SSCR0_P(3)))))