[ARM] 3140/1: NSLU2 machine support

Patch from Alessandro Zummo

This patch adds support for the LinkSys NSLU2 running with
both big and little-endian kernels. The LinkSys NSLU2 is
a cost engineered ARM, XScale 420 based system similar to
the the Intel IXDP425 evaluation board. It uses the
IXP4XX ARCH.

While this patch applies independently of other patches
the resultant kernel requires further patches to successfully
use onboard devices, including the onboard flash. Since these
patches are independent of this one they will be submitted
separately.

A defconfig is not included here because not all of
the required drivers are actually in the kernel.
We intend to provide one as soon as the patches
will be incorporated in mainstream.

This patch is the combined work of nslu2-linux.org

Signed-off-by: John Bowler <jbowler@acm.org>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 104 insertions, 0 deletions

diff --git a/include/asm-arm/arch-ixp4xx/hardware.h b/include/asm-arm/arch-ixp4xx/hardware.h
index 55d85eea8c1a..cfb413c845f7 100644
--- a/include/asm-arm/arch-ixp4xx/hardware.h
+++ b/include/asm-arm/arch-ixp4xx/hardware.h
@@ -44,5 +44,6 @@ extern unsigned int processor_id;
 #include "ixdp425.h"
 #include "coyote.h"
 #include "prpmc1100.h"
+#include "nslu2.h"
 
 #endif  /* _ASM_ARCH_HARDWARE_H */
diff --git a/include/asm-arm/arch-ixp4xx/irqs.h b/include/asm-arm/arch-ixp4xx/irqs.h
index ca808281c7f9..2cf4930372bc 100644
--- a/include/asm-arm/arch-ixp4xx/irqs.h
+++ b/include/asm-arm/arch-ixp4xx/irqs.h
@@ -93,4 +93,11 @@
 #define IRQ_COYOTE_PCI_SLOT1    IRQ_IXP4XX_GPIO11
 #define IRQ_COYOTE_IDE          IRQ_IXP4XX_GPIO5
 
+/*
+ * NSLU2 board IRQs
+ */
+#define        IRQ_NSLU2_PCI_INTA      IRQ_IXP4XX_GPIO11
+#define        IRQ_NSLU2_PCI_INTB      IRQ_IXP4XX_GPIO10
+#define        IRQ_NSLU2_PCI_INTC      IRQ_IXP4XX_GPIO9
+
 #endif
diff --git a/include/asm-arm/arch-ixp4xx/nslu2.h b/include/asm-arm/arch-ixp4xx/nslu2.h
new file mode 100644
index 000000000000..b8b347a559c7
--- /dev/null
+++ b/include/asm-arm/arch-ixp4xx/nslu2.h
@@ -0,0 +1,96 @@
+/*
+ * include/asm-arm/arch-ixp4xx/nslu2.h
+ *
+ * NSLU2 platform specific definitions
+ *
+ * Author: Mark Rakes <mrakes AT mac.com>
+ * Maintainers: http://www.nslu2-linux.org
+ *
+ * based on ixdp425.h:
+ *      Copyright 2004 (c) MontaVista, Software, Inc.
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef __ASM_ARCH_HARDWARE_H__
+#error "Do not include this directly, instead #include <asm/hardware.h>"
+#endif
+
+#define NSLU2_FLASH_BASE        IXP4XX_EXP_BUS_CS0_BASE_PHYS
+#define NSLU2_FLASH_SIZE        IXP4XX_EXP_BUS_CSX_REGION_SIZE
+
+#define NSLU2_SDA_PIN           7
+#define NSLU2_SCL_PIN           6
+
+/*
+ * NSLU2 PCI IRQs
+ */
+#define NSLU2_PCI_MAX_DEV       3
+#define NSLU2_PCI_IRQ_LINES     3
+
+
+/* PCI controller GPIO to IRQ pin mappings */
+#define NSLU2_PCI_INTA_PIN      11
+#define NSLU2_PCI_INTB_PIN      10
+#define NSLU2_PCI_INTC_PIN      9
+#define NSLU2_PCI_INTD_PIN      8
+
+
+/* NSLU2 Timer */
+#define NSLU2_FREQ 66000000
+#define NSLU2_CLOCK_TICK_RATE (((NSLU2_FREQ / HZ & ~IXP4XX_OST_RELOAD_MASK) + 1) * HZ)
+#define NSLU2_CLOCK_TICKS_PER_USEC ((NSLU2_CLOCK_TICK_RATE + USEC_PER_SEC/2) / USEC_PER_SEC)
+
+/* GPIO */
+
+#define NSLU2_GPIO0             0
+#define NSLU2_GPIO1             1
+#define NSLU2_GPIO2             2
+#define NSLU2_GPIO3             3
+#define NSLU2_GPIO4             4
+#define NSLU2_GPIO5             5
+#define NSLU2_GPIO6             6
+#define NSLU2_GPIO7             7
+#define NSLU2_GPIO8             8
+#define NSLU2_GPIO9             9
+#define NSLU2_GPIO10            10
+#define NSLU2_GPIO11            11
+#define NSLU2_GPIO12            12
+#define NSLU2_GPIO13            13
+#define NSLU2_GPIO14            14
+#define NSLU2_GPIO15            15
+
+/* Buttons */
+
+#define NSLU2_PB_GPIO           NSLU2_GPIO5
+#define NSLU2_PO_GPIO           NSLU2_GPIO8     /* power off */
+#define NSLU2_RB_GPIO           NSLU2_GPIO12
+
+#define NSLU2_PB_IRQ            IRQ_IXP4XX_GPIO5
+#define NSLU2_RB_IRQ            IRQ_IXP4XX_GPIO12
+
+#define NSLU2_PB_BM             (1L << NSLU2_PB_GPIO)
+#define NSLU2_PO_BM             (1L << NSLU2_PO_GPIO)
+#define NSLU2_RB_BM             (1L << NSLU2_RB_GPIO)
+
+/* Buzzer */
+
+#define NSLU2_GPIO_BUZZ         4
+#define NSLU2_BZ_BM             (1L << NSLU2_GPIO_BUZZ)
+/* LEDs */
+
+#define NSLU2_LED_RED           NSLU2_GPIO0
+#define NSLU2_LED_GRN           NSLU2_GPIO1
+
+#define NSLU2_LED_RED_BM        (1L << NSLU2_LED_RED)
+#define NSLU2_LED_GRN_BM        (1L << NSLU2_LED_GRN)
+
+#define NSLU2_LED_DISK1         NSLU2_GPIO2
+#define NSLU2_LED_DISK2         NSLU2_GPIO3
+
+#define NSLU2_LED_DISK1_BM      (1L << NSLU2_GPIO2)
+#define NSLU2_LED_DISK2_BM      (1L << NSLU2_GPIO3)
+
+