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Subject[PATCH] 2.6.14: NSLU2 machine support
Date
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.

Building a kernel for the NSLU2 also requires the following
patches not in 2.6.14:

[PATCH] 2.6.14-rc3 ixp4xx_copy_from little endian/alignment
[PATCH] 2.6.14 include/asm-arm/arch-ixp4xx/timex.h: fix clockfrequency on NSLU2
[PATCH]: 2.6.14-rc5 arch-ixp4xx/system.h: ensure flash is readable before reboot

and for correct operation of little-endian kernels (not
required for big-endian):

[PATCH] 2.6.14-rc3 ixp4xx AHB/PCI endianness fix
[PATCH]: 2.6.14-rc3 drives/mtd/redboot.c: recognise a foreign bytesex partition table

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

Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: John Bowler <jbowler@acm.org>

--- linux-2.6.13/.pc/50-nslu2-arch.patch/arch/arm/boot/compressed/head.S 2005-08-28 16:41:01.000000000 -0700
+++ linux-2.6.13/arch/arm/boot/compressed/head.S 2005-10-26 15:23:39.646352497 -0700
@@ -37,6 +37,7 @@
defined(CONFIG_ARCH_INTEGRATOR) || \
defined(CONFIG_ARCH_PXA) || \
defined(CONFIG_ARCH_IXP4XX) || \
+ defined(CONFIG_MACH_NSLU2) || \
defined(CONFIG_ARCH_IXP2000) || \
defined(CONFIG_ARCH_LH7A40X) || \
defined(CONFIG_ARCH_OMAP)
--- linux-2.6.13/.pc/50-nslu2-arch.patch/arch/arm/mach-ixp4xx/Kconfig 2005-08-28 16:41:01.000000000 -0700
+++ linux-2.6.13/arch/arm/mach-ixp4xx/Kconfig 2005-10-26 15:23:39.646352497 -0700
@@ -43,6 +43,12 @@ config MACH_IXDP465
IXDP465 Development Platform (Also known as BMP).
For more information on this platform, see <file:Documentation/arm/IXP4xx>.

+config MACH_NSLU2
+ bool "NSLU2"
+ help
+ Say 'Y' here if you want your kernel to support Linksys's
+ NSLU2 NAS device. For more information on this platform,
+ see http://www.nslu2-linux.org

#
# IXCDP1100 is the exact same HW as IXDP425, but with a different machine
--- linux-2.6.13/.pc/50-nslu2-arch.patch/arch/arm/mach-ixp4xx/Makefile 2005-08-28 16:41:01.000000000 -0700
+++ linux-2.6.13/arch/arm/mach-ixp4xx/Makefile 2005-10-26 15:23:39.646352497 -0700
@@ -8,4 +8,5 @@ obj-$(CONFIG_ARCH_IXDP4XX) += ixdp425-pc
obj-$(CONFIG_MACH_IXDPG425) += ixdpg425-pci.o coyote-setup.o
obj-$(CONFIG_ARCH_ADI_COYOTE) += coyote-pci.o coyote-setup.o
obj-$(CONFIG_MACH_GTWX5715) += gtwx5715-pci.o gtwx5715-setup.o
+obj-$(CONFIG_MACH_NSLU2) += nslu2-pci.o nslu2-setup.o nslu2-power.o

--- linux-2.6.13/.pc/50-nslu2-arch.patch/arch/arm/mach-ixp4xx/nslu2-pci.c 2005-10-26 15:19:43.171472071 -0700
+++ linux-2.6.13/arch/arm/mach-ixp4xx/nslu2-pci.c 2005-10-26 15:23:39.646352497 -0700
@@ -0,0 +1,78 @@
+/*
+ * arch/arm/mach-ixp4xx/nslu2-pci.c
+ *
+ * NSLU2 board-level PCI initialization
+ *
+ * based on ixdp425-pci.c:
+ * Copyright (C) 2002 Intel Corporation.
+ * Copyright (C) 2003-2004 MontaVista Software, Inc.
+ *
+ * Maintainer: http://www.nslu2-linux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include <asm/mach/pci.h>
+#include <asm/mach-types.h>
+
+void __init nslu2_pci_preinit(void)
+{
+ set_irq_type(IRQ_NSLU2_PCI_INTA, IRQT_LOW);
+ set_irq_type(IRQ_NSLU2_PCI_INTB, IRQT_LOW);
+ set_irq_type(IRQ_NSLU2_PCI_INTC, IRQT_LOW);
+
+ gpio_line_isr_clear(NSLU2_PCI_INTA_PIN);
+ gpio_line_isr_clear(NSLU2_PCI_INTB_PIN);
+ gpio_line_isr_clear(NSLU2_PCI_INTC_PIN);
+
+ /* INTD is not configured as GPIO is used
+ * for the power input button.
+ */
+
+ ixp4xx_pci_preinit();
+}
+
+static int __init nslu2_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ static int pci_irq_table[NSLU2_PCI_IRQ_LINES] = {
+ IRQ_NSLU2_PCI_INTA,
+ IRQ_NSLU2_PCI_INTB,
+ IRQ_NSLU2_PCI_INTC,
+ };
+
+ int irq = -1;
+
+ if (slot >= 1 && slot <= NSLU2_PCI_MAX_DEV &&
+ pin >= 1 && pin <= NSLU2_PCI_IRQ_LINES) {
+ irq = pci_irq_table[
+ (slot + pin - 2) % NSLU2_PCI_IRQ_LINES];
+ }
+
+ return irq;
+}
+
+struct hw_pci __initdata nslu2_pci = {
+ .nr_controllers = 1,
+ .preinit = nslu2_pci_preinit,
+ .swizzle = pci_std_swizzle,
+ .setup = ixp4xx_setup,
+ .scan = ixp4xx_scan_bus,
+ .map_irq = nslu2_map_irq,
+};
+
+int __init nslu2_pci_init(void) /* monkey see, monkey do */
+{
+ if (machine_is_nslu2())
+ pci_common_init(&nslu2_pci);
+
+ return 0;
+}
+
+subsys_initcall(nslu2_pci_init);
--- linux-2.6.13/.pc/50-nslu2-arch.patch/arch/arm/mach-ixp4xx/nslu2-power.c 2005-10-26 15:19:43.171472071 -0700
+++ linux-2.6.13/arch/arm/mach-ixp4xx/nslu2-power.c 2005-10-26 15:23:39.646352497 -0700
@@ -0,0 +1,92 @@
+/*
+ * arch/arm/mach-ixp4xx/nslu2-power.c
+ *
+ * NSLU2 Power/Reset driver
+ *
+ * Copyright (C) 2005 Tower Technologies
+ *
+ * based on nslu2-io.c
+ * Copyright (C) 2004 Karen Spearel
+ *
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ * Maintainers: http://www.nslu2-linux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+
+#include <asm/mach-types.h>
+
+static irqreturn_t nslu2_power_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+ /* Signal init to do the ctrlaltdel action */
+ kill_proc(1, SIGINT, 1);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t nslu2_reset_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+ /* FIXME This doesn't reset the NSLU2. It powers it off.
+ * Close enough, since reset is unreliable
+ */
+
+ machine_power_off();
+
+ return IRQ_HANDLED;
+}
+
+static int __init nslu2_power_init(void)
+{
+ if (!(machine_is_nslu2()))
+ return 0;
+
+ printk(KERN_INFO "NSLU2: power/reset\n");
+
+ *IXP4XX_GPIO_GPISR = 0x20400000; /* read the 2 irqs to clr */
+
+ set_irq_type(NSLU2_RB_IRQ, IRQT_LOW);
+ set_irq_type(NSLU2_PB_IRQ, IRQT_HIGH);
+
+ gpio_line_isr_clear(NSLU2_RB_GPIO);
+ gpio_line_isr_clear(NSLU2_PB_GPIO);
+
+ if (request_irq(NSLU2_RB_IRQ, &nslu2_reset_handler,
+ SA_INTERRUPT, "NSLU2 reset button", NULL) < 0) {
+
+ printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
+ NSLU2_RB_IRQ);
+
+ return -EIO;
+ }
+
+ if (request_irq(NSLU2_PB_IRQ, &nslu2_power_handler,
+ SA_INTERRUPT, "NSLU2 power button", NULL) < 0) {
+
+ printk(KERN_DEBUG "Power Button IRQ %d not available\n",
+ NSLU2_PB_IRQ);
+
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static void __exit nslu2_power_exit(void)
+{
+ free_irq(NSLU2_RB_IRQ, NULL);
+ free_irq(NSLU2_PB_IRQ, NULL);
+}
+
+module_init(nslu2_power_init);
+module_exit(nslu2_power_exit);
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("NSLU2 Power/Reset driver");
+MODULE_LICENSE("GPL");
--- linux-2.6.13/.pc/50-nslu2-arch.patch/arch/arm/mach-ixp4xx/nslu2-setup.c 2005-10-26 15:19:43.171472071 -0700
+++ linux-2.6.13/arch/arm/mach-ixp4xx/nslu2-setup.c 2005-10-26 15:23:39.646352497 -0700
@@ -0,0 +1,134 @@
+/*
+ * arch/arm/mach-ixp4xx/nslu2-setup.c
+ *
+ * NSLU2 board-setup
+ *
+ * based ixdp425-setup.c:
+ * Copyright (C) 2003-2004 MontaVista Software, Inc.
+ *
+ * Author: Mark Rakes <mrakes at mac.com>
+ * Maintainers: http://www.nslu2-linux.org/
+ *
+ * Fixed missing init_time in MACHINE_START kas11 10/22/04
+ * Changed to conform to new style __init ixdp425 kas11 10/22/04
+ */
+
+#include <linux/kernel.h>
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+
+#include <asm/mach-types.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/flash.h>
+
+static struct flash_platform_data nslu2_flash_data = {
+ .map_name = "cfi_probe",
+ .width = 2,
+};
+
+static struct resource nslu2_flash_resource = {
+ .start = NSLU2_FLASH_BASE,
+ .end = NSLU2_FLASH_BASE + NSLU2_FLASH_SIZE,
+ .flags = IORESOURCE_MEM,
+};
+
+static struct platform_device nslu2_flash = {
+ .name = "IXP4XX-Flash",
+ .id = 0,
+ .dev.platform_data = &nslu2_flash_data,
+ .num_resources = 1,
+ .resource = &nslu2_flash_resource,
+};
+
+static struct ixp4xx_i2c_pins nslu2_i2c_gpio_pins = {
+ .sda_pin = NSLU2_SDA_PIN,
+ .scl_pin = NSLU2_SCL_PIN,
+};
+
+static struct platform_device nslu2_i2c_controller = {
+ .name = "IXP4XX-I2C",
+ .id = 0,
+ .dev.platform_data = &nslu2_i2c_gpio_pins,
+ .num_resources = 0
+};
+
+static struct resource nslu2_uart_resources[] = {
+ {
+ .start = IXP4XX_UART1_BASE_PHYS,
+ .end = IXP4XX_UART1_BASE_PHYS + 0x0fff,
+ .flags = IORESOURCE_MEM
+ },
+ {
+ .start = IXP4XX_UART2_BASE_PHYS,
+ .end = IXP4XX_UART2_BASE_PHYS + 0x0fff,
+ .flags = IORESOURCE_MEM
+ }
+};
+
+static struct plat_serial8250_port nslu2_uart_data[] = {
+ {
+ .mapbase = IXP4XX_UART1_BASE_PHYS,
+ .membase = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
+ .irq = IRQ_IXP4XX_UART1,
+ .flags = UPF_BOOT_AUTOCONF,
+ .iotype = UPIO_MEM,
+ .regshift = 2,
+ .uartclk = IXP4XX_UART_XTAL,
+ },
+ {
+ .mapbase = IXP4XX_UART2_BASE_PHYS,
+ .membase = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
+ .irq = IRQ_IXP4XX_UART2,
+ .flags = UPF_BOOT_AUTOCONF,
+ .iotype = UPIO_MEM,
+ .regshift = 2,
+ .uartclk = IXP4XX_UART_XTAL,
+ },
+ { }
+};
+
+static struct platform_device nslu2_uart = {
+ .name = "serial8250",
+ .id = PLAT8250_DEV_PLATFORM,
+ .dev.platform_data = nslu2_uart_data,
+ .num_resources = 2,
+ .resource = nslu2_uart_resources
+};
+
+static struct platform_device *nslu2_devices[] __initdata = {
+ &nslu2_i2c_controller,
+ &nslu2_flash,
+ &nslu2_uart
+};
+
+static void nslu2_power_off(void)
+{
+ /* This causes the box to drop the power and go dead. */
+
+ /* enable the pwr cntl gpio */
+ gpio_line_config(NSLU2_PO_GPIO, IXP4XX_GPIO_OUT);
+
+ /* do the deed */
+ gpio_line_set(NSLU2_PO_GPIO, IXP4XX_GPIO_HIGH);
+}
+
+static void __init nslu2_init(void)
+{
+ ixp4xx_sys_init();
+
+ pm_power_off = nslu2_power_off;
+
+ platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));
+}
+
+MACHINE_START(NSLU2, "Linksys NSLU2")
+ /* Maintainer: www.nslu2-linux.org */
+ .phys_ram = PHYS_OFFSET,
+ .phys_io = IXP4XX_PERIPHERAL_BASE_PHYS,
+ .io_pg_offst = ((IXP4XX_PERIPHERAL_BASE_VIRT) >> 18) & 0xFFFC,
+ .boot_params = 0x00000100,
+ .map_io = ixp4xx_map_io,
+ .init_irq = ixp4xx_init_irq, /* FIXME: all irq are off here */
+ .timer = &ixp4xx_timer,
+ .init_machine = nslu2_init,
+MACHINE_END
--- linux-2.6.13/.pc/50-nslu2-arch.patch/include/asm-arm/arch-ixp4xx/hardware.h 2005-10-26 15:19:37.451112111 -0700
+++ linux-2.6.13/include/asm-arm/arch-ixp4xx/hardware.h 2005-10-26 15:23:39.650352748 -0700
@@ -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 */
--- linux-2.6.13/.pc/50-nslu2-arch.patch/include/asm-arm/arch-ixp4xx/irqs.h 2005-08-28 16:41:01.000000000 -0700
+++ linux-2.6.13/include/asm-arm/arch-ixp4xx/irqs.h 2005-10-26 15:23:39.650352748 -0700
@@ -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
--- linux-2.6.13/.pc/50-nslu2-arch.patch/include/asm-arm/arch-ixp4xx/nslu2.h 2005-10-26 15:19:43.175472322 -0700
+++ linux-2.6.13/include/asm-arm/arch-ixp4xx/nslu2.h 2005-10-26 15:23:39.650352748 -0700
@@ -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)
+
+
-
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