UART1, UART2 and the expansion bus config registers
are the only registers mapped in a fixed location
when using device tree.
For device tree we also want to get rid of the custom
<mach/io.h> for IXP4xx. So we need to undefine
CONFIG_NEED_MACH_IO_H. Doing that activates the fixed
mapping of the PCI IO space to PCI_IO_VIRT_BASE which
is hardcoded to 0xFEE00000 and this would collide with
the old fixed mappings.
Move the UART1 and UART2 to the beginning of the fixmap
region at 0xFFC80000-0xFFC81FFF and move the expansion
bus base to 0xFFC82000-0xFFC81FFF in order to be able to
accommodate for the fixed PCI virtual IO space.
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Imre Kaloz <kaloz@xxxxxxxxxxx>
Cc: Krzysztof Halasa <khalasa@xxxxxxx>
Cc: Zoltan HERPAI <wigyori@xxxxxxx>
Cc: Raylynn Knight <rayknight@xxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
PCI maintainers: this patch is mostly FYI, will be
merged through ARM SoC
---
arch/arm/Kconfig.debug | 4 ++--
arch/arm/mach-ixp4xx/include/mach/ixp4xx-regs.h | 7 ++++---
arch/arm/mach-ixp4xx/ixp4xx-of.c | 8 ++++++--
3 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 9e0b5e7f12af..bbe799f6bc03 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -1803,8 +1803,8 @@ config DEBUG_UART_VIRT
default 0xfedc0000 if DEBUG_EP93XX
default 0xfee003f8 if DEBUG_FOOTBRIDGE_COM1
default 0xfee20000 if DEBUG_NSPIRE_CLASSIC_UART || DEBUG_NSPIRE_CX_UART
- default 0xfef00000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
- default 0xfef00003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
+ default 0xffc80000 if ARCH_IXP4XX && !CPU_BIG_ENDIAN
+ default 0xffc80003 if ARCH_IXP4XX && CPU_BIG_ENDIAN
default 0xfef36000 if DEBUG_HIGHBANK_UART
default 0xfefb0000 if DEBUG_OMAP1UART1 || DEBUG_OMAP7XXUART1
default 0xfefb0800 if DEBUG_OMAP1UART2 || DEBUG_OMAP7XXUART2
diff --git a/arch/arm/mach-ixp4xx/include/mach/ixp4xx-regs.h b/arch/arm/mach-ixp4xx/include/mach/ixp4xx-regs.h
index 708d085ce39f..45b0f2c3a1d6 100644
--- a/arch/arm/mach-ixp4xx/include/mach/ixp4xx-regs.h
+++ b/arch/arm/mach-ixp4xx/include/mach/ixp4xx-regs.h
@@ -59,7 +59,7 @@
* Expansion BUS Configuration registers
*/
#define IXP4XX_EXP_CFG_BASE_PHYS 0xC4000000
-#define IXP4XX_EXP_CFG_BASE_VIRT 0xFEF14000
+#define IXP4XX_EXP_CFG_BASE_VIRT 0xFFC82000
#define IXP4XX_EXP_CFG_REGION_SIZE 0x00001000
#define IXP4XX_EXP_CS0_OFFSET 0x00
@@ -120,8 +120,9 @@
#define IXP4XX_SSP_BASE_PHYS (IXP4XX_PERIPHERAL_BASE_PHYS + 0x12000)
-#define IXP4XX_UART1_BASE_VIRT (IXP4XX_PERIPHERAL_BASE_VIRT + 0x0000)
-#define IXP4XX_UART2_BASE_VIRT (IXP4XX_PERIPHERAL_BASE_VIRT + 0x1000)
+/* The UART is explicitly put in the beginning of fixmap */
+#define IXP4XX_UART1_BASE_VIRT (0xFFC80000)
+#define IXP4XX_UART2_BASE_VIRT (0xFFC81000)
#define IXP4XX_PMU_BASE_VIRT (IXP4XX_PERIPHERAL_BASE_VIRT + 0x2000)
#define IXP4XX_INTC_BASE_VIRT (IXP4XX_PERIPHERAL_BASE_VIRT + 0x3000)
#define IXP4XX_GPIO_BASE_VIRT (IXP4XX_PERIPHERAL_BASE_VIRT + 0x4000)
diff --git a/arch/arm/mach-ixp4xx/ixp4xx-of.c b/arch/arm/mach-ixp4xx/ixp4xx-of.c
index 7449b8319c8a..e3d823c077e8 100644
--- a/arch/arm/mach-ixp4xx/ixp4xx-of.c
+++ b/arch/arm/mach-ixp4xx/ixp4xx-of.c
@@ -9,8 +9,12 @@
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
-#include <mach/hardware.h>
-#include <mach/ixp4xx-regs.h>
+/*
+ * These are the only fixed phys to virt mappings we ever need
+ * we put it right after the UART mapping at 0xffc80000-0xffc81fff
+ */
+#define IXP4XX_EXP_CFG_BASE_PHYS 0xC4000000
+#define IXP4XX_EXP_CFG_BASE_VIRT 0xFFC82000
static struct map_desc ixp4xx_of_io_desc[] __initdata = {
/*
--
2.29.2
