[POWERPC] Fixes to allow use of Ebony's flash chips through physmap_of

[linux-2.6-omap-h63xx.git] / arch / powerpc / boot / ebony.c

diff --git a/arch/powerpc/boot/ebony.c b/arch/powerpc/boot/ebony.c
index 75daedafd0a4d3c48f6924d54e7f6c8fbd3d656a..eaf0b9bb68d6acc84a285a6df8fec7686799f566 100644 (file)
--- a/arch/powerpc/boot/ebony.c
+++ b/arch/powerpc/boot/ebony.c
@@ -24,6 +24,7 @@
 #include "page.h"
 #include "ops.h"
 #include "reg.h"
+#include "io.h"
 #include "dcr.h"
 #include "44x.h"
 
@@ -92,6 +93,43 @@ void ibm440gp_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
        dt_fixup_clock("/plb/opb/serial@40000300", uart1);
 }
 
+#define EBONY_FPGA_PATH                "/plb/opb/ebc/fpga"
+#define        EBONY_FPGA_FLASH_SEL    0x01
+#define EBONY_SMALL_FLASH_PATH "/plb/opb/ebc/small-flash"
+
+static void ebony_flashsel_fixup(void)
+{
+       void *devp;
+       u32 reg[3] = {0x0, 0x0, 0x80000};
+       u8 *fpga;
+       u8 fpga_reg0 = 0x0;
+
+       devp = finddevice(EBONY_FPGA_PATH);
+       if (!devp)
+               fatal("Couldn't locate FPGA node %s\n\r", EBONY_FPGA_PATH);
+
+       if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
+               fatal("%s has missing or invalid virtual-reg property\n\r",
+                     EBONY_FPGA_PATH);
+
+       fpga_reg0 = in_8(fpga);
+
+       devp = finddevice(EBONY_SMALL_FLASH_PATH);
+       if (!devp)
+               fatal("Couldn't locate small flash node %s\n\r",
+                     EBONY_SMALL_FLASH_PATH);
+
+       if (getprop(devp, "reg", reg, sizeof(reg)) != sizeof(reg))
+               fatal("%s has reg property of unexpected size\n\r",
+                     EBONY_SMALL_FLASH_PATH);
+
+       /* Invert address bit 14 (IBM-endian) if FLASH_SEL fpga bit is set */
+       if (fpga_reg0 & EBONY_FPGA_FLASH_SEL)
+               reg[1] ^= 0x80000;
+
+       setprop(devp, "reg", reg, sizeof(reg));
+}
+
 static void ebony_fixups(void)
 {
        // FIXME: sysclk should be derived by reading the FPGA registers
@@ -101,6 +139,7 @@ static void ebony_fixups(void)
        ibm44x_fixup_memsize();
        dt_fixup_mac_addresses(ebony_mac0, ebony_mac1);
        ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");
+       ebony_flashsel_fixup();
 }
 
 void ebony_init(void *mac0, void *mac1)