[ARM] pxa: cpufreq-pxa2xx: sdram_rows detection support

This patch implements Eric Miao's idea to detect the correct value of
sdram_rows by inspecting the MDCNFG register settings.
It is only tested on two pxa27x devices with 64MB RAM (magician and
hx4700) so far.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/include/mach/pxa2xx-regs.h b/arch/arm/mach-pxa/include/mach/pxa2xx-regs.h
index 2b71d87c898f..77102d695cc7 100644
--- a/arch/arm/mach-pxa/include/mach/pxa2xx-regs.h
+++ b/arch/arm/mach-pxa/include/mach/pxa2xx-regs.h
@@ -49,6 +49,11 @@
 #define MECR_NOS        (1 << 0)        /* Number Of Sockets: 0 -> 1 sock, 1 -> 2 sock */
 #define MECR_CIT        (1 << 1)        /* Card Is There: 0 -> no card, 1 -> card inserted */
 
+#define MDCNFG_DE0      (1 << 0)        /* SDRAM Bank 0 Enable */
+#define MDCNFG_DE1      (1 << 1)        /* SDRAM Bank 1 Enable */
+#define MDCNFG_DE2      (1 << 16)       /* SDRAM Bank 2 Enable */
+#define MDCNFG_DE3      (1 << 17)       /* SDRAM Bank 3 Enable */
+
 #define MDREFR_K0DB4    (1 << 29)       /* SDCLK0 Divide by 4 Control/Status */
 #define MDREFR_K2FREE   (1 << 25)       /* SDRAM Free-Running Control */
 #define MDREFR_K1FREE   (1 << 24)       /* SDRAM Free-Running Control */