Add initial support for Mips based SoCs made by Lantiq. This series will add
support for the XWAY family.
The series allows booting a minimal system using a initramfs or NOR. Missing
drivers and support for Amazon and GPON family will be provided in a later
series.
Signed-off-by: John Crispin <blogic@xxxxxxxxxxx>
Signed-off-by: Ralph Hempel <ralph.hempel@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
---
Changes in V2
* handle external interrup sources
* properly set io_base
* handle CMDLINE properly
* remove custom early_printf
Changes in V3
* whitespace
* change __iomem void to void __iomem
* multiline comments
* use pr_* macros instead of printk
arch/mips/Kbuild.platforms | 1 +
arch/mips/Kconfig | 17 ++
arch/mips/include/asm/mach-lantiq/lantiq.h | 58 +++++
arch/mips/include/asm/mach-lantiq/war.h | 24 ++
arch/mips/lantiq/Makefile | 9 +
arch/mips/lantiq/Platform | 7 +
arch/mips/lantiq/clk.c | 135 ++++++++++++
arch/mips/lantiq/clk.h | 18 ++
arch/mips/lantiq/early_printk.c | 34 +++
arch/mips/lantiq/irq.c | 319 ++++++++++++++++++++++++++++
arch/mips/lantiq/prom.c | 77 +++++++
arch/mips/lantiq/prom.h | 24 ++
arch/mips/lantiq/setup.c | 47 ++++
13 files changed, 770 insertions(+), 0 deletions(-)
create mode 100644 arch/mips/include/asm/mach-lantiq/lantiq.h
create mode 100644 arch/mips/include/asm/mach-lantiq/war.h
create mode 100644 arch/mips/lantiq/Makefile
create mode 100644 arch/mips/lantiq/Platform
create mode 100644 arch/mips/lantiq/clk.c
create mode 100644 arch/mips/lantiq/clk.h
create mode 100644 arch/mips/lantiq/early_printk.c
create mode 100644 arch/mips/lantiq/irq.c
create mode 100644 arch/mips/lantiq/prom.c
create mode 100644 arch/mips/lantiq/prom.h
create mode 100644 arch/mips/lantiq/setup.c
diff --git a/arch/mips/Kbuild.platforms b/arch/mips/Kbuild.platforms
index 7ff9b54..aef6c91 100644
--- a/arch/mips/Kbuild.platforms
+++ b/arch/mips/Kbuild.platforms
@@ -11,6 +11,7 @@ platforms += dec
platforms += emma
platforms += jazz
platforms += jz4740
+platforms += lantiq
platforms += lasat
platforms += loongson
platforms += mipssim
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index bd7b64d..f975932 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -210,6 +210,23 @@ config MACH_JZ4740
select SYS_HAS_EARLY_PRINTK
select HAVE_PWM
+config LANTIQ
+ bool "Lantiq based platforms"
+ select DMA_NONCOHERENT
+ select IRQ_CPU
+ select CEVT_R4K
+ select CSRC_R4K
+ select SYS_HAS_CPU_MIPS32_R1
+ select SYS_HAS_CPU_MIPS32_R2
+ select SYS_SUPPORTS_BIG_ENDIAN
+ select SYS_SUPPORTS_32BIT_KERNEL
+ select SYS_SUPPORTS_MULTITHREADING
+ select SYS_HAS_EARLY_PRINTK
+ select ARCH_REQUIRE_GPIOLIB
+ select SWAP_IO_SPACE
+ select BOOT_RAW
+ select HAVE_CLK
+
config LASAT
bool "LASAT Networks platforms"
select CEVT_R4K
diff --git a/arch/mips/include/asm/mach-lantiq/lantiq.h b/arch/mips/include/asm/mach-lantiq/lantiq.h
new file mode 100644
index 0000000..f7f4516
--- /dev/null
+++ b/arch/mips/include/asm/mach-lantiq/lantiq.h
@@ -0,0 +1,58 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2010 John Crispin <blogic@xxxxxxxxxxx>
+ */
+
+#ifndef _LANTIQ_H__
+#define _LANTIQ_H__
+
+/* generic reg access functions */
+#define ltq_r32(reg) __raw_readl(reg)
+#define ltq_w32(val, reg) __raw_writel(val, reg)
+#define ltq_w32_mask(clear, set, reg) \
+ ltq_w32((ltq_r32(reg) & ~(clear)) | (set), reg)
+#define ltq_r8(reg) __raw_readb(reg)
+#define ltq_w8(val, reg) __raw_writeb(val, reg)
+
+/* register access macros for EBU and CGU */
+#define ltq_ebu_w32(x, y) ltq_w32((x), ltq_ebu_membase + (y))
+#define ltq_ebu_r32(x) ltq_r32(ltq_ebu_membase + (x))
+#define ltq_cgu_w32(x, y) ltq_w32((x), ltq_cgu_membase + (y))
+#define ltq_cgu_r32(x) ltq_r32(ltq_cgu_membase + (x))
+
+extern __iomem void *ltq_ebu_membase;
+extern __iomem void *ltq_cgu_membase;
+
+extern unsigned int ltq_get_cpu_ver(void);
+extern unsigned int ltq_get_soc_type(void);
+
+/* clock speeds */
+#define CLOCK_60M 60000000
+#define CLOCK_83M 83333333
+#define CLOCK_111M 111111111
+#define CLOCK_133M 133333333
+#define CLOCK_167M 166666667
+#define CLOCK_200M 200000000
+#define CLOCK_266M 266666666
+#define CLOCK_333M 333333333
+#define CLOCK_400M 400000000
+
+/* spinlock all ebu i/o */
+extern spinlock_t ebu_lock;
+
+/* some irq helpers */
+extern void ltq_disable_irq(unsigned int irq_nr);
+extern void ltq_mask_and_ack_irq(unsigned int irq_nr);
+extern void ltq_enable_irq(unsigned int irq_nr);
+
+#define IOPORT_RESOURCE_START 0x10000000
+#define IOPORT_RESOURCE_END 0xffffffff
+#define IOMEM_RESOURCE_START 0x10000000
+#define IOMEM_RESOURCE_END 0xffffffff
+#define LTQ_FLASH_START 0x10000000
+#define LTQ_FLASH_MAX 0x04000000
+
+#endif
diff --git a/arch/mips/include/asm/mach-lantiq/war.h b/arch/mips/include/asm/mach-lantiq/war.h
new file mode 100644
index 0000000..01b08ef
--- /dev/null
+++ b/arch/mips/include/asm/mach-lantiq/war.h
@@ -0,0 +1,24 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+#ifndef __ASM_MIPS_MACH_LANTIQ_WAR_H
+#define __ASM_MIPS_MACH_LANTIQ_WAR_H
+
+#define R4600_V1_INDEX_ICACHEOP_WAR 0
+#define R4600_V1_HIT_CACHEOP_WAR 0
+#define R4600_V2_HIT_CACHEOP_WAR 0
+#define R5432_CP0_INTERRUPT_WAR 0
+#define BCM1250_M3_WAR 0
+#define SIBYTE_1956_WAR 0
+#define MIPS4K_ICACHE_REFILL_WAR 0
+#define MIPS_CACHE_SYNC_WAR 0
+#define TX49XX_ICACHE_INDEX_INV_WAR 0
+#define RM9000_CDEX_SMP_WAR 0
+#define ICACHE_REFILLS_WORKAROUND_WAR 0
+#define R10000_LLSC_WAR 0
+#define MIPS34K_MISSED_ITLB_WAR 0
+
+#endif
diff --git a/arch/mips/lantiq/Makefile b/arch/mips/lantiq/Makefile
new file mode 100644
index 0000000..6a30de6
--- /dev/null
+++ b/arch/mips/lantiq/Makefile
@@ -0,0 +1,9 @@
+# Copyright (C) 2010 John Crispin <blogic@xxxxxxxxxxx>
+#
+# 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.
+
+obj-y := irq.o setup.o clk.o prom.o
+
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
diff --git a/arch/mips/lantiq/Platform b/arch/mips/lantiq/Platform
new file mode 100644
index 0000000..eef587f
--- /dev/null
+++ b/arch/mips/lantiq/Platform
@@ -0,0 +1,7 @@
+#
+# Lantiq
+#
+
+platform-$(CONFIG_LANTIQ) += lantiq/
+cflags-$(CONFIG_LANTIQ) += -I$(srctree)/arch/mips/include/asm/mach-lantiq
+load-$(CONFIG_LANTIQ) = 0xffffffff80002000
diff --git a/arch/mips/lantiq/clk.c b/arch/mips/lantiq/clk.c
new file mode 100644
index 0000000..d0c060e
--- /dev/null
+++ b/arch/mips/lantiq/clk.c
@@ -0,0 +1,135 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2010 Thomas Langer <thomas.langer@xxxxxxxxxx>
+ * Copyright (C) 2010 John Crispin <blogic@xxxxxxxxxxx>
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/list.h>
+
+#include <asm/time.h>
+#include <asm/irq.h>
+#include <asm/div64.h>
+
+#include <lantiq_soc.h>
+
+#include "clk.h"
+
+struct clk {
+ const char *name;
+ unsigned long rate;
+ unsigned long (*get_rate) (void);
+};
+
+static struct clk *cpu_clk;
+static int cpu_clk_cnt;
+
+/* lantiq socs have 3 static clocks */
+static struct clk cpu_clk_generic[] = {
+ {
+ .name = "cpu",
+ .get_rate = ltq_get_cpu_hz,
+ }, {
+ .name = "fpi",
+ .get_rate = ltq_get_fpi_hz,
+ }, {
+ .name = "io",
+ .get_rate = ltq_get_io_region_clock,
+ },
+};
+
+/* remapped clock register range */
+void __iomem *ltq_cgu_membase;
+
+void
+clk_init(void)
+{
+ cpu_clk = cpu_clk_generic;
+ cpu_clk_cnt = ARRAY_SIZE(cpu_clk_generic);
+}
+
+static inline int
+clk_good(struct clk *clk)
+{
+ return clk && !IS_ERR(clk);
+}
+
+unsigned long
+clk_get_rate(struct clk *clk)
+{
+ if (unlikely(!clk_good(clk)))
+ return 0;
+
+ if (clk->rate != 0)
+ return clk->rate;
+
+ if (clk->get_rate != NULL)
+ return clk->get_rate();
+
+ return 0;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+struct clk*
+clk_get(struct device *dev, const char *id)
+{
+ int i;
+
+ for (i = 0; i < cpu_clk_cnt; i++)
+ if (!strcmp(id, cpu_clk[i].name))
+ return &cpu_clk[i];
+ BUG();
+ return ERR_PTR(-ENOENT);
+}
+EXPORT_SYMBOL(clk_get);
+
+void
+clk_put(struct clk *clk)
+{
+ /* not used */
+}
+EXPORT_SYMBOL(clk_put);
+
+static inline u32
+ltq_get_counter_resolution(void)
+{
+ u32 res;
+
+ __asm__ __volatile__(
+ ".set push\n"
+ ".set mips32r2\n"
+ ".set noreorder\n"
+ "rdhwr %0, $3\n"
+ "ehb\n"
+ ".set pop\n"
+ : "=&r" (res)
+ : /* no input */
+ : "memory");
+ instruction_hazard();
+ return res;
+}
+
+void __init
+plat_time_init(void)
+{
+ struct clk *clk;
+
+ ltq_cgu_membase = ioremap_nocache(LTQ_CGU_BASE_ADDR, LTQ_CGU_SIZE);
+ if (!ltq_cgu_membase) {
+ pr_err("Failed to remap cgu memory\n");
+ unreachable();
+ }
+ clk = clk_get(0, "cpu");
+ mips_hpt_frequency = clk_get_rate(clk) / ltq_get_counter_resolution();
+ write_c0_compare(read_c0_count());
+ clk_put(clk);
+}
diff --git a/arch/mips/lantiq/clk.h b/arch/mips/lantiq/clk.h
new file mode 100644
index 0000000..3328925
--- /dev/null
+++ b/arch/mips/lantiq/clk.h
@@ -0,0 +1,18 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2010 John Crispin <blogic@xxxxxxxxxxx>
+ */
+
+#ifndef _LTQ_CLK_H__
+#define _LTQ_CLK_H__
+
+extern void clk_init(void);
+
+extern unsigned long ltq_get_cpu_hz(void);
+extern unsigned long ltq_get_fpi_hz(void);
+extern unsigned long ltq_get_io_region_clock(void);
+
+#endif
diff --git a/arch/mips/lantiq/early_printk.c b/arch/mips/lantiq/early_printk.c
new file mode 100644
index 0000000..ebccf60
--- /dev/null
+++ b/arch/mips/lantiq/early_printk.c
@@ -0,0 +1,34 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2010 John Crispin <blogic@xxxxxxxxxxx>
+ */
+
+#include <linux/init.h>
+#include <linux/cpu.h>
+
+#include <lantiq.h>
+#include <lantiq_soc.h>
+
+/* no ioremap possible at this early stage, lets use KSEG1 instead */
+#define LTQ_ASC_BASE KSEG1ADDR(LTQ_ASC1_BASE_ADDR)
+#define ASC_BUF 1024
+#define LTQ_ASC_FSTAT ((u32 *)(LTQ_ASC_BASE + 0x0048))
+#define LTQ_ASC_TBUF ((u32 *)(LTQ_ASC_BASE + 0x0020))
+#define TXMASK 0x3F00
+#define TXOFFSET 8
+
+void
+prom_putchar(char c)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ do { } while ((ltq_r32(LTQ_ASC_FSTAT) & TXMASK) >> TXOFFSET);
+ if (c == '\n')
+ ltq_w32('\r', LTQ_ASC_TBUF);
+ ltq_w32(c, LTQ_ASC_TBUF);
+ local_irq_restore(flags);
+}
diff --git a/arch/mips/lantiq/irq.c b/arch/mips/lantiq/irq.c
new file mode 100644
index 0000000..bd3c166
--- /dev/null
+++ b/arch/mips/lantiq/irq.c
@@ -0,0 +1,319 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2010 John Crispin <blogic@xxxxxxxxxxx>
+ * Copyright (C) 2010 Thomas Langer <thomas.langer@xxxxxxxxxx>
+ */
+
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+
+#include <asm/bootinfo.h>
+#include <asm/irq_cpu.h>
+
+#include <lantiq_soc.h>
+#include <irq.h>
+
+/* register definitions */
+#define LTQ_ICU_IM0_ISR 0x0000
+#define LTQ_ICU_IM0_IER 0x0008
+#define LTQ_ICU_IM0_IOSR 0x0010
+#define LTQ_ICU_IM0_IRSR 0x0018
+#define LTQ_ICU_IM0_IMR 0x0020
+#define LTQ_ICU_IM1_ISR 0x0028
+#define LTQ_ICU_OFFSET (LTQ_ICU_IM1_ISR - LTQ_ICU_IM0_ISR)
+
+#define LTQ_EIU_EXIN_C 0x0000
+#define LTQ_EIU_EXIN_INIC 0x0004
+#define LTQ_EIU_EXIN_INEN 0x000C
+
+/* irq numbers used by the external interrupt unit (EIU) */
+#define LTQ_EIU_IR0 INT_NUM_IM4_IRL0 + 30
+#define LTQ_EIU_IR1 INT_NUM_IM3_IRL0 + 31
+#define LTQ_EIU_IR2 INT_NUM_IM1_IRL0 + 26
+#define LTQ_EIU_IR3 INT_NUM_IM1_IRL0
+#define LTQ_EIU_IR4 INT_NUM_IM1_IRL0 + 1
+#define LTQ_EIU_IR5 INT_NUM_IM1_IRL0 + 2
+#define LTQ_EIU_IR6 INT_NUM_IM2_IRL0 + 30
+
+#define MAX_EIU 6
+
+/* irqs generated by device attached to the EBU need to be acked in
+ * a special manner
+ */
+#define LTQ_ICU_EBU_IRQ 22
+
+#define ltq_icu_w32(x, y) ltq_w32((x), ltq_icu_membase + (y))
+#define ltq_icu_r32(x) ltq_r32(ltq_icu_membase + (x))
+
+#define ltq_eiu_w32(x, y) ltq_w32((x), ltq_eiu_membase + (y))
+#define ltq_eiu_r32(x) ltq_r32(ltq_eiu_membase + (x))
+
+static unsigned short ltq_eiu_irq[MAX_EIU] = {
+ LTQ_EIU_IR0,
+ LTQ_EIU_IR1,
+ LTQ_EIU_IR2,
+ LTQ_EIU_IR3,
+ LTQ_EIU_IR4,
+ LTQ_EIU_IR5,
+};
+
+static void __iomem *ltq_icu_membase;
+static void __iomem *ltq_eiu_membase;
+
+void
+ltq_disable_irq(unsigned int irq_nr)
+{
+ u32 ier = LTQ_ICU_IM0_IER;
+
+ irq_nr -= INT_NUM_IRQ0;
+ ier += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET);
+ irq_nr %= INT_NUM_IM_OFFSET;
+ ltq_icu_w32(ltq_icu_r32(ier) & ~(1 << irq_nr), ier);
+}
+
+void
+ltq_mask_and_ack_irq(unsigned int irq_nr)
+{
+ u32 ier = LTQ_ICU_IM0_IER;
+ u32 isr = LTQ_ICU_IM0_ISR;
+
+ irq_nr -= INT_NUM_IRQ0;
+ ier += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET);
+ isr += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET);
+ irq_nr %= INT_NUM_IM_OFFSET;
+ ltq_icu_w32(ltq_icu_r32(ier) & ~(1 << irq_nr), ier);
+ ltq_icu_w32((1 << irq_nr), isr);
+}
+
+static void
+ltq_ack_irq(unsigned int irq_nr)
+{
+ u32 isr = LTQ_ICU_IM0_ISR;
+
+ irq_nr -= INT_NUM_IRQ0;
+ isr += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET);
+ irq_nr %= INT_NUM_IM_OFFSET;
+ ltq_icu_w32((1 << irq_nr), isr);
+}
+
+void
+ltq_enable_irq(unsigned int irq_nr)
+{
+ u32 ier = LTQ_ICU_IM0_IER;
+
+ irq_nr -= INT_NUM_IRQ0;
+ ier += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET);
+ irq_nr %= INT_NUM_IM_OFFSET;
+ ltq_icu_w32(ltq_icu_r32(ier) | (1 << irq_nr), ier);
+}
+
+static unsigned int
+ltq_startup_eiu_irq(unsigned int irq)
+{
+ int i;
+
+ ltq_enable_irq(irq);
+ for (i = 0; i < MAX_EIU; i++) {
+ if (irq == ltq_eiu_irq[i]) {
+ /* low level - we should really handle set_type */
+ ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_C) | (0x6 << (i * 4)),
+ LTQ_EIU_EXIN_C);
+ /* clear all pending */
+ ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INIC) & ~(1 << i),
+ LTQ_EIU_EXIN_INIC);
+ /* enable */
+ ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) | (1 << i),
+ LTQ_EIU_EXIN_INEN);
+ break;
+ }
+ }
+ return 0;
+}
+
+static void
+ltq_shutdown_eiu_irq(unsigned int irq)
+{
+ int i;
+
+ ltq_disable_irq(irq);
+ for (i = 0; i < MAX_EIU; i++) {
+ if (irq == ltq_eiu_irq[i]) {
+ /* disable */
+ ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) & ~(1 << i),
+ LTQ_EIU_EXIN_INEN);
+ break;
+ }
+ }
+}
+
+static void
+ltq_end_irq(unsigned int irq)
+{
+ if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+ ltq_enable_irq(irq);
+}
+
+static struct irq_chip
+ltq_irq_type = {
+ "ltq_irq",
+ .enable = ltq_enable_irq,
+ .disable = ltq_disable_irq,
+ .unmask = ltq_enable_irq,
+ .ack = ltq_ack_irq,
+ .mask = ltq_disable_irq,
+ .mask_ack = ltq_mask_and_ack_irq,
+ .end = ltq_end_irq,
+};
+
+static struct irq_chip
+ltq_eiu_type = {
+ "ltq_eiu_irq",
+ .startup = ltq_startup_eiu_irq,
+ .shutdown = ltq_shutdown_eiu_irq,
+ .enable = ltq_enable_irq,
+ .disable = ltq_disable_irq,
+ .unmask = ltq_enable_irq,
+ .ack = ltq_ack_irq,
+ .mask = ltq_disable_irq,
+ .mask_ack = ltq_mask_and_ack_irq,
+ .end = ltq_end_irq,
+};
+
+static void
+ltq_hw_irqdispatch(int module)
+{
+ u32 irq;
+
+ irq = ltq_icu_r32(LTQ_ICU_IM0_IOSR + (module * LTQ_ICU_OFFSET));
+ if (irq == 0)
+ return;
+
+ /* silicon bug causes only the msb set to 1 to be valid. all
+ * other bits might be bogus
+ */
+ irq = __fls(irq);
+ do_IRQ((int)irq + INT_NUM_IM0_IRL0 + (INT_NUM_IM_OFFSET * module));
+
+ /* if this is a EBU irq, we need to ack it or get a deadlock */
+ if ((irq == LTQ_ICU_EBU_IRQ) && (module == 0))
+ ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_ISTAT) | 0x10,
+ LTQ_EBU_PCC_ISTAT);
+}
+
+#define DEFINE_HWx_IRQDISPATCH(x) \
+static void ltq_hw ## x ## _irqdispatch(void)\
+{\
+ ltq_hw_irqdispatch(x); \
+}
+DEFINE_HWx_IRQDISPATCH(0)
+DEFINE_HWx_IRQDISPATCH(1)
+DEFINE_HWx_IRQDISPATCH(2)
+DEFINE_HWx_IRQDISPATCH(3)
+DEFINE_HWx_IRQDISPATCH(4)
+
+static void ltq_hw5_irqdispatch(void)
+{
+ do_IRQ(MIPS_CPU_TIMER_IRQ);
+}
+
+asmlinkage void
+plat_irq_dispatch(void)
+{
+ unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
+ unsigned int i;
+
+ if (pending & CAUSEF_IP7) {
+ do_IRQ(MIPS_CPU_TIMER_IRQ);
+ goto out;
+ } else {
+ for (i = 0; i < 5; i++) {
+ if (pending & (CAUSEF_IP2 << i)) {
+ ltq_hw_irqdispatch(i);
+ goto out;
+ }
+ }
+ }
+ pr_alert("Spurious IRQ: CAUSE=0x%08x\n", read_c0_status());
+
+out:
+ return;
+}
+
+static struct irqaction
+cascade = {
+ .handler = no_action,
+ .flags = IRQF_DISABLED,
+ .name = "cascade",
+};
+
+void __init
+arch_init_irq(void)
+{
+ int i;
+
+ ltq_icu_membase = ioremap_nocache(LTQ_ICU_BASE_ADDR, LTQ_ICU_SIZE);
+ if (!ltq_icu_membase) {
+ pr_err("Failed to remap irq memory\n");
+ unreachable();
+ }
+
+ ltq_eiu_membase = ioremap_nocache(LTQ_EIU_BASE_ADDR, LTQ_EIU_SIZE);
+ if (!ltq_eiu_membase) {
+ pr_err("Failed to remap eiu memory\n");
+ unreachable();
+ }
+
+ /* make sure all irqs are turned off by default */
+ for (i = 0; i < 5; i++)
+ ltq_icu_w32(0, LTQ_ICU_IM0_IER + (i * LTQ_ICU_OFFSET));
+
+ /* clear all possibly pending interrupts */
+ ltq_icu_w32(~0, LTQ_ICU_IM0_ISR + (i * LTQ_ICU_OFFSET));
+
+ mips_cpu_irq_init();
+
+ for (i = 2; i <= 6; i++)
+ setup_irq(i, &cascade);
+
+ if (cpu_has_vint) {
+ pr_info("Setting up vectored interrupts\n");
+ set_vi_handler(2, ltq_hw0_irqdispatch);
+ set_vi_handler(3, ltq_hw1_irqdispatch);
+ set_vi_handler(4, ltq_hw2_irqdispatch);
+ set_vi_handler(5, ltq_hw3_irqdispatch);
+ set_vi_handler(6, ltq_hw4_irqdispatch);
+ set_vi_handler(7, ltq_hw5_irqdispatch);
+ }
+
+ for (i = INT_NUM_IRQ0;
+ i <= (INT_NUM_IRQ0 + (5 * INT_NUM_IM_OFFSET)); i++)
+ if ((i == LTQ_EIU_IR0) || (i == LTQ_EIU_IR1) ||
+ (i == LTQ_EIU_IR2))
+ set_irq_chip_and_handler(i, <q_eiu_type,
+ handle_level_irq);
+ /* EIU3-5 only exist on ar9 and vr9 */
+ else if (((i == LTQ_EIU_IR3) || (i == LTQ_EIU_IR4) ||
+ (i == LTQ_EIU_IR5)) && (ltq_is_ar9() || ltq_is_vr9()))
+ set_irq_chip_and_handler(i, <q_eiu_type,
+ handle_level_irq);
+ else
+ set_irq_chip_and_handler(i, <q_irq_type,
+ handle_level_irq);
+
+#if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
+ set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 |
+ IE_IRQ3 | IE_IRQ4 | IE_IRQ5);
+#else
+ set_c0_status(IE_SW0 | IE_SW1 | IE_IRQ0 | IE_IRQ1 |
+ IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5);
+#endif
+}
+
+unsigned int __cpuinit
+get_c0_compare_int(void)
+{
+ return CP0_LEGACY_COMPARE_IRQ;
+}
diff --git a/arch/mips/lantiq/prom.c b/arch/mips/lantiq/prom.c
new file mode 100644
index 0000000..d873830
--- /dev/null
+++ b/arch/mips/lantiq/prom.c
@@ -0,0 +1,77 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2010 John Crispin <blogic@xxxxxxxxxxx>
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <asm/bootinfo.h>
+#include <asm/time.h>
+
+#include <lantiq.h>
+
+#include "prom.h"
+#include "clk.h"
+
+static struct ltq_soc_info soc_info;
+
+unsigned int
+ltq_get_cpu_ver(void)
+{
+ return soc_info.rev;
+}
+EXPORT_SYMBOL(ltq_get_cpu_ver);
+
+unsigned int
+ltq_get_soc_type(void)
+{
+ return soc_info.type;
+}
+EXPORT_SYMBOL(ltq_get_soc_type);
+
+const char*
+get_system_type(void)
+{
+ return soc_info.sys_type;
+}
+
+void
+prom_free_prom_memory(void)
+{
+}
+
+static void __init
+prom_init_cmdline(void)
+{
+ int argc = fw_arg0;
+ char **argv = (char **) KSEG1ADDR(fw_arg1);
+ int i;
+
+ for (i = 0; i < argc; i++) {
+ char *p = (char *) KSEG1ADDR(argv[i]);
+
+ if (p && *p) {
+ strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
+ strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
+ }
+ }
+}
+
+void __init
+prom_init(void)
+{
+ struct clk *clk;
+
+ ltq_soc_detect(&soc_info);
+ clk_init();
+ clk = clk_get(0, "cpu");
+ snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev1.%d",
+ soc_info.name, soc_info.rev);
+ clk_put(clk);
+ soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0';
+ pr_info("SoC: %s\n", soc_info.sys_type);
+ prom_init_cmdline();
+}
diff --git a/arch/mips/lantiq/prom.h b/arch/mips/lantiq/prom.h
new file mode 100644
index 0000000..b9d6562
--- /dev/null
+++ b/arch/mips/lantiq/prom.h
@@ -0,0 +1,24 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2010 John Crispin <blogic@xxxxxxxxxxx>
+ */
+
+#ifndef _LTQ_PROM_H__
+#define _LTQ_PROM_H__
+
+#define LTQ_SYS_TYPE_LEN 0x100
+
+struct ltq_soc_info {
+ unsigned char *name;
+ unsigned int rev;
+ unsigned int partnum;
+ unsigned int type;
+ unsigned char sys_type[LTQ_SYS_TYPE_LEN];
+};
+
+void ltq_soc_detect(struct ltq_soc_info *i);
+
+#endif
diff --git a/arch/mips/lantiq/setup.c b/arch/mips/lantiq/setup.c
new file mode 100644
index 0000000..edeb076
--- /dev/null
+++ b/arch/mips/lantiq/setup.c
@@ -0,0 +1,47 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2010 John Crispin <blogic@xxxxxxxxxxx>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <asm/bootinfo.h>
+
+#include <lantiq_soc.h>
+
+void __init
+plat_mem_setup(void)
+{
+ /* assume 16M as default incase uboot fails to pass proper ramsize */
+ unsigned long memsize = 16;
+ char **envp = (char **) KSEG1ADDR(fw_arg2);
+ u32 status;
+
+ /* make sure to have no "reverse endian" for user mode */
+ status = read_c0_status();
+ status &= (~(1<<25));
+ write_c0_status(status);
+
+ ioport_resource.start = IOPORT_RESOURCE_START;
+ ioport_resource.end = IOPORT_RESOURCE_END;
+ iomem_resource.start = IOMEM_RESOURCE_START;
+ iomem_resource.end = IOMEM_RESOURCE_END;
+
+ set_io_port_base((unsigned long) KSEG1);
+
+ while (*envp) {
+ char *e = (char *)KSEG1ADDR(*envp);
+ if (!strncmp(e, "memsize=", 8)) {
+ e += 8;
+ strict_strtoul(e, 0, &memsize);
+ }
+ envp++;
+ }
+ memsize *= 1024 * 1024;
+ add_memory_region(0x00000000, memsize, BOOT_MEM_RAM);
+}
--
1.7.2.3
