target/linux/lantiq/patches-2.6.39/0001-MIPS-Lantiq-Add-initial-support-for-Lantiq-SoCs.patch

   1 From 9e0235e97ea2617beaacaa16ab5f0b9e75f4680e Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Wed, 30 Mar 2011 09:27:47 +0200
   4 Subject: [PATCH 01/13] MIPS: Lantiq: Add initial support for Lantiq SoCs
   5
   6 Add initial support for Mips based SoCs made by Lantiq. This series will add
   7 support for the XWAY family.
   8
   9 The series allows booting a minimal system using a initramfs or NOR. Missing
  10 drivers and support for Amazon and GPON family will be provided in a later
  11 series.
  12
  13 [Ralf: Remove some cargo cult programming and fixed formatting.]
  14
  15 Signed-off-by: John Crispin <blogic@openwrt.org>
  16 Signed-off-by: Ralph Hempel <ralph.hempel@lantiq.com>
  17 Signed-off-by: David Daney <ddaney@caviumnetworks.com>
  18 Cc: linux-mips@linux-mips.org
  19 Patchwork: https://patchwork.linux-mips.org/patch/2252/
  20 Patchwork: https://patchwork.linux-mips.org/patch/2371/
  21 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
  22 ---
  23  arch/mips/Kbuild.platforms                 |    1 +
  24  arch/mips/Kconfig                          |   17 ++
  25  arch/mips/include/asm/mach-lantiq/lantiq.h |   63 ++++++
  26  arch/mips/include/asm/mach-lantiq/war.h    |   24 ++
  27  arch/mips/lantiq/Makefile                  |    9 +
  28  arch/mips/lantiq/Platform                  |    7 +
  29  arch/mips/lantiq/clk.c                     |  140 ++++++++++++
  30  arch/mips/lantiq/clk.h                     |   18 ++
  31  arch/mips/lantiq/early_printk.c            |   33 +++
  32  arch/mips/lantiq/irq.c                     |  326 ++++++++++++++++++++++++++++
  33  arch/mips/lantiq/prom.c                    |   71 ++++++
  34  arch/mips/lantiq/prom.h                    |   24 ++
  35  arch/mips/lantiq/setup.c                   |   41 ++++
  36  13 files changed, 774 insertions(+), 0 deletions(-)
  37  create mode 100644 arch/mips/include/asm/mach-lantiq/lantiq.h
  38  create mode 100644 arch/mips/include/asm/mach-lantiq/war.h
  39  create mode 100644 arch/mips/lantiq/Makefile
  40  create mode 100644 arch/mips/lantiq/Platform
  41  create mode 100644 arch/mips/lantiq/clk.c
  42  create mode 100644 arch/mips/lantiq/clk.h
  43  create mode 100644 arch/mips/lantiq/early_printk.c
  44  create mode 100644 arch/mips/lantiq/irq.c
  45  create mode 100644 arch/mips/lantiq/prom.c
  46  create mode 100644 arch/mips/lantiq/prom.h
  47  create mode 100644 arch/mips/lantiq/setup.c
  48
  49 --- a/arch/mips/Kconfig
  50 +++ b/arch/mips/Kconfig
  51 @@ -212,6 +212,23 @@ config MACH_JZ4740
  52         select HAVE_PWM
  53         select HAVE_CLK
  54
  55 +config LANTIQ
  56 +       bool "Lantiq based platforms"
  57 +       select DMA_NONCOHERENT
  58 +       select IRQ_CPU
  59 +       select CEVT_R4K
  60 +       select CSRC_R4K
  61 +       select SYS_HAS_CPU_MIPS32_R1
  62 +       select SYS_HAS_CPU_MIPS32_R2
  63 +       select SYS_SUPPORTS_BIG_ENDIAN
  64 +       select SYS_SUPPORTS_32BIT_KERNEL
  65 +       select SYS_SUPPORTS_MULTITHREADING
  66 +       select SYS_HAS_EARLY_PRINTK
  67 +       select ARCH_REQUIRE_GPIOLIB
  68 +       select SWAP_IO_SPACE
  69 +       select BOOT_RAW
  70 +       select HAVE_CLK
  71 +
  72  config LASAT
  73         bool "LASAT Networks platforms"
  74         select CEVT_R4K
  75 --- /dev/null
  76 +++ b/arch/mips/include/asm/mach-lantiq/lantiq.h
  77 @@ -0,0 +1,63 @@
  78 +/*
  79 + *  This program is free software; you can redistribute it and/or modify it
  80 + *  under the terms of the GNU General Public License version 2 as published
  81 + *  by the Free Software Foundation.
  82 + *
  83 + *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
  84 + */
  85 +#ifndef _LANTIQ_H__
  86 +#define _LANTIQ_H__
  87 +
  88 +#include <linux/irq.h>
  89 +
  90 +/* generic reg access functions */
  91 +#define ltq_r32(reg)           __raw_readl(reg)
  92 +#define ltq_w32(val, reg)      __raw_writel(val, reg)
  93 +#define ltq_w32_mask(clear, set, reg)  \
  94 +       ltq_w32((ltq_r32(reg) & ~(clear)) | (set), reg)
  95 +#define ltq_r8(reg)            __raw_readb(reg)
  96 +#define ltq_w8(val, reg)       __raw_writeb(val, reg)
  97 +
  98 +/* register access macros for EBU and CGU */
  99 +#define ltq_ebu_w32(x, y)      ltq_w32((x), ltq_ebu_membase + (y))
 100 +#define ltq_ebu_r32(x)         ltq_r32(ltq_ebu_membase + (x))
 101 +#define ltq_cgu_w32(x, y)      ltq_w32((x), ltq_cgu_membase + (y))
 102 +#define ltq_cgu_r32(x)         ltq_r32(ltq_cgu_membase + (x))
 103 +
 104 +extern __iomem void *ltq_ebu_membase;
 105 +extern __iomem void *ltq_cgu_membase;
 106 +
 107 +extern unsigned int ltq_get_cpu_ver(void);
 108 +extern unsigned int ltq_get_soc_type(void);
 109 +
 110 +/* clock speeds */
 111 +#define CLOCK_60M      60000000
 112 +#define CLOCK_83M      83333333
 113 +#define CLOCK_111M     111111111
 114 +#define CLOCK_133M     133333333
 115 +#define CLOCK_167M     166666667
 116 +#define CLOCK_200M     200000000
 117 +#define CLOCK_266M     266666666
 118 +#define CLOCK_333M     333333333
 119 +#define CLOCK_400M     400000000
 120 +
 121 +/* spinlock all ebu i/o */
 122 +extern spinlock_t ebu_lock;
 123 +
 124 +/* some irq helpers */
 125 +extern void ltq_disable_irq(struct irq_data *d);
 126 +extern void ltq_mask_and_ack_irq(struct irq_data *d);
 127 +extern void ltq_enable_irq(struct irq_data *d);
 128 +
 129 +/* find out what caused the last cpu reset */
 130 +extern int ltq_reset_cause(void);
 131 +#define LTQ_RST_CAUSE_WDTRST   0x20
 132 +
 133 +#define IOPORT_RESOURCE_START  0x10000000
 134 +#define IOPORT_RESOURCE_END    0xffffffff
 135 +#define IOMEM_RESOURCE_START   0x10000000
 136 +#define IOMEM_RESOURCE_END     0xffffffff
 137 +#define LTQ_FLASH_START                0x10000000
 138 +#define LTQ_FLASH_MAX          0x04000000
 139 +
 140 +#endif
 141 --- /dev/null
 142 +++ b/arch/mips/include/asm/mach-lantiq/war.h
 143 @@ -0,0 +1,24 @@
 144 +/*
 145 + * This file is subject to the terms and conditions of the GNU General Public
 146 + * License.  See the file "COPYING" in the main directory of this archive
 147 + * for more details.
 148 + *
 149 + */
 150 +#ifndef __ASM_MIPS_MACH_LANTIQ_WAR_H
 151 +#define __ASM_MIPS_MACH_LANTIQ_WAR_H
 152 +
 153 +#define R4600_V1_INDEX_ICACHEOP_WAR     0
 154 +#define R4600_V1_HIT_CACHEOP_WAR        0
 155 +#define R4600_V2_HIT_CACHEOP_WAR        0
 156 +#define R5432_CP0_INTERRUPT_WAR         0
 157 +#define BCM1250_M3_WAR                  0
 158 +#define SIBYTE_1956_WAR                 0
 159 +#define MIPS4K_ICACHE_REFILL_WAR        0
 160 +#define MIPS_CACHE_SYNC_WAR             0
 161 +#define TX49XX_ICACHE_INDEX_INV_WAR     0
 162 +#define RM9000_CDEX_SMP_WAR             0
 163 +#define ICACHE_REFILLS_WORKAROUND_WAR   0
 164 +#define R10000_LLSC_WAR                 0
 165 +#define MIPS34K_MISSED_ITLB_WAR         0
 166 +
 167 +#endif
 168 --- /dev/null
 169 +++ b/arch/mips/lantiq/Makefile
 170 @@ -0,0 +1,9 @@
 171 +# Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 172 +#
 173 +# This program is free software; you can redistribute it and/or modify it
 174 +# under the terms of the GNU General Public License version 2 as published
 175 +# by the Free Software Foundation.
 176 +
 177 +obj-y := irq.o setup.o clk.o prom.o
 178 +
 179 +obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
 180 --- /dev/null
 181 +++ b/arch/mips/lantiq/Platform
 182 @@ -0,0 +1,7 @@
 183 +#
 184 +# Lantiq
 185 +#
 186 +
 187 +platform-$(CONFIG_LANTIQ)      += lantiq/
 188 +cflags-$(CONFIG_LANTIQ)                += -I$(srctree)/arch/mips/include/asm/mach-lantiq
 189 +load-$(CONFIG_LANTIQ)          = 0xffffffff80002000
 190 --- /dev/null
 191 +++ b/arch/mips/lantiq/clk.c
 192 @@ -0,0 +1,144 @@
 193 +/*
 194 + *  This program is free software; you can redistribute it and/or modify it
 195 + *  under the terms of the GNU General Public License version 2 as published
 196 + *  by the Free Software Foundation.
 197 + *
 198 + * Copyright (C) 2010 Thomas Langer <thomas.langer@lantiq.com>
 199 + * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 200 + */
 201 +#include <linux/io.h>
 202 +#include <linux/module.h>
 203 +#include <linux/init.h>
 204 +#include <linux/kernel.h>
 205 +#include <linux/types.h>
 206 +#include <linux/clk.h>
 207 +#include <linux/err.h>
 208 +#include <linux/list.h>
 209 +
 210 +#include <asm/time.h>
 211 +#include <asm/irq.h>
 212 +#include <asm/div64.h>
 213 +
 214 +#include <lantiq_soc.h>
 215 +
 216 +#include "clk.h"
 217 +
 218 +struct clk {
 219 +       const char *name;
 220 +       unsigned long rate;
 221 +       unsigned long (*get_rate) (void);
 222 +};
 223 +
 224 +static struct clk *cpu_clk;
 225 +static int cpu_clk_cnt;
 226 +
 227 +/* lantiq socs have 3 static clocks */
 228 +static struct clk cpu_clk_generic[] = {
 229 +       {
 230 +               .name = "cpu",
 231 +               .get_rate = ltq_get_cpu_hz,
 232 +       }, {
 233 +               .name = "fpi",
 234 +               .get_rate = ltq_get_fpi_hz,
 235 +       }, {
 236 +               .name = "io",
 237 +               .get_rate = ltq_get_io_region_clock,
 238 +       },
 239 +};
 240 +
 241 +#ifdef CONFIG_SOC_TYPE_XWAY
 242 +static struct resource ltq_cgu_resource = {
 243 +       .name   = "cgu",
 244 +       .start  = LTQ_CGU_BASE_ADDR,
 245 +       .end    = LTQ_CGU_BASE_ADDR + LTQ_CGU_SIZE - 1,
 246 +       .flags  = IORESOURCE_MEM,
 247 +};
 248 +
 249 +/* remapped clock register range */
 250 +void __iomem *ltq_cgu_membase;
 251 +#endif
 252 +
 253 +void clk_init(void)
 254 +{
 255 +       cpu_clk = cpu_clk_generic;
 256 +       cpu_clk_cnt = ARRAY_SIZE(cpu_clk_generic);
 257 +}
 258 +
 259 +static inline int clk_good(struct clk *clk)
 260 +{
 261 +       return clk && !IS_ERR(clk);
 262 +}
 263 +
 264 +unsigned long clk_get_rate(struct clk *clk)
 265 +{
 266 +       if (unlikely(!clk_good(clk)))
 267 +               return 0;
 268 +
 269 +       if (clk->rate != 0)
 270 +               return clk->rate;
 271 +
 272 +       if (clk->get_rate != NULL)
 273 +               return clk->get_rate();
 274 +
 275 +       return 0;
 276 +}
 277 +EXPORT_SYMBOL(clk_get_rate);
 278 +
 279 +struct clk *clk_get(struct device *dev, const char *id)
 280 +{
 281 +       int i;
 282 +
 283 +       for (i = 0; i < cpu_clk_cnt; i++)
 284 +               if (!strcmp(id, cpu_clk[i].name))
 285 +                       return &cpu_clk[i];
 286 +       BUG();
 287 +       return ERR_PTR(-ENOENT);
 288 +}
 289 +EXPORT_SYMBOL(clk_get);
 290 +
 291 +void clk_put(struct clk *clk)
 292 +{
 293 +       /* not used */
 294 +}
 295 +EXPORT_SYMBOL(clk_put);
 296 +
 297 +static inline u32 ltq_get_counter_resolution(void)
 298 +{
 299 +       u32 res;
 300 +
 301 +       __asm__ __volatile__(
 302 +               ".set   push\n"
 303 +               ".set   mips32r2\n"
 304 +               "rdhwr  %0, $3\n"
 305 +               ".set pop\n"
 306 +               : "=&r" (res)
 307 +               : /* no input */
 308 +               : "memory");
 309 +
 310 +       return res;
 311 +}
 312 +
 313 +void __init plat_time_init(void)
 314 +{
 315 +       struct clk *clk;
 316 +
 317 +#ifdef CONFIG_SOC_TYPE_XWAY
 318 +       if (insert_resource(&iomem_resource, &ltq_cgu_resource) < 0)
 319 +               panic("Failed to insert cgu memory\n");
 320 +
 321 +       if (request_mem_region(ltq_cgu_resource.start,
 322 +                       resource_size(&ltq_cgu_resource), "cgu") < 0)
 323 +               panic("Failed to request cgu memory\n");
 324 +
 325 +       ltq_cgu_membase = ioremap_nocache(ltq_cgu_resource.start,
 326 +                               resource_size(&ltq_cgu_resource));
 327 +       if (!ltq_cgu_membase) {
 328 +               pr_err("Failed to remap cgu memory\n");
 329 +               unreachable();
 330 +       }
 331 +#endif
 332 +       clk = clk_get(0, "cpu");
 333 +       mips_hpt_frequency = clk_get_rate(clk) / ltq_get_counter_resolution();
 334 +       write_c0_compare(read_c0_count());
 335 +       clk_put(clk);
 336 +}
 337 --- /dev/null
 338 +++ b/arch/mips/lantiq/clk.h
 339 @@ -0,0 +1,18 @@
 340 +/*
 341 + *  This program is free software; you can redistribute it and/or modify it
 342 + *  under the terms of the GNU General Public License version 2 as published
 343 + *  by the Free Software Foundation.
 344 + *
 345 + * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 346 + */
 347 +
 348 +#ifndef _LTQ_CLK_H__
 349 +#define _LTQ_CLK_H__
 350 +
 351 +extern void clk_init(void);
 352 +
 353 +extern unsigned long ltq_get_cpu_hz(void);
 354 +extern unsigned long ltq_get_fpi_hz(void);
 355 +extern unsigned long ltq_get_io_region_clock(void);
 356 +
 357 +#endif
 358 --- /dev/null
 359 +++ b/arch/mips/lantiq/early_printk.c
 360 @@ -0,0 +1,37 @@
 361 +/*
 362 + *  This program is free software; you can redistribute it and/or modify it
 363 + *  under the terms of the GNU General Public License version 2 as published
 364 + *  by the Free Software Foundation.
 365 + *
 366 + *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 367 + */
 368 +
 369 +#include <linux/init.h>
 370 +#include <linux/cpu.h>
 371 +
 372 +#include <lantiq.h>
 373 +#include <lantiq_soc.h>
 374 +
 375 +/* no ioremap possible at this early stage, lets use KSEG1 instead  */
 376 +#ifdef CONFIG_SOC_FALCON
 377 +#define LTQ_ASC_BASE   KSEG1ADDR(LTQ_ASC0_BASE_ADDR)
 378 +#else
 379 +#define LTQ_ASC_BASE   KSEG1ADDR(LTQ_ASC1_BASE_ADDR)
 380 +#endif
 381 +#define ASC_BUF                1024
 382 +#define LTQ_ASC_FSTAT  ((u32 *)(LTQ_ASC_BASE + 0x0048))
 383 +#define LTQ_ASC_TBUF   ((u32 *)(LTQ_ASC_BASE + 0x0020))
 384 +#define TXMASK         0x3F00
 385 +#define TXOFFSET       8
 386 +
 387 +void prom_putchar(char c)
 388 +{
 389 +       unsigned long flags;
 390 +
 391 +       local_irq_save(flags);
 392 +       do { } while ((ltq_r32(LTQ_ASC_FSTAT) & TXMASK) >> TXOFFSET);
 393 +       if (c == '\n')
 394 +               ltq_w32('\r', LTQ_ASC_TBUF);
 395 +       ltq_w32(c, LTQ_ASC_TBUF);
 396 +       local_irq_restore(flags);
 397 +}
 398 --- /dev/null
 399 +++ b/arch/mips/lantiq/irq.c
 400 @@ -0,0 +1,339 @@
 401 +/*
 402 + *  This program is free software; you can redistribute it and/or modify it
 403 + *  under the terms of the GNU General Public License version 2 as published
 404 + *  by the Free Software Foundation.
 405 + *
 406 + * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 407 + * Copyright (C) 2010 Thomas Langer <thomas.langer@lantiq.com>
 408 + */
 409 +
 410 +#include <linux/interrupt.h>
 411 +#include <linux/ioport.h>
 412 +#include <linux/module.h>
 413 +
 414 +#include <asm/bootinfo.h>
 415 +#include <asm/irq_cpu.h>
 416 +
 417 +#include <lantiq_soc.h>
 418 +#include <irq.h>
 419 +
 420 +/* register definitions */
 421 +#define LTQ_ICU_IM0_ISR                0x0000
 422 +#define LTQ_ICU_IM0_IER                0x0008
 423 +#define LTQ_ICU_IM0_IOSR       0x0010
 424 +#define LTQ_ICU_IM0_IRSR       0x0018
 425 +#define LTQ_ICU_IM0_IMR                0x0020
 426 +#define LTQ_ICU_IM1_ISR                0x0028
 427 +#define LTQ_ICU_OFFSET         (LTQ_ICU_IM1_ISR - LTQ_ICU_IM0_ISR)
 428 +
 429 +#ifdef CONFIG_SOC_TYPE_XWAY
 430 +
 431 +#define LTQ_EIU_EXIN_C         0x0000
 432 +#define LTQ_EIU_EXIN_INIC      0x0004
 433 +#define LTQ_EIU_EXIN_INEN      0x000C
 434 +
 435 +/* irq numbers used by the external interrupt unit (EIU) */
 436 +#define LTQ_EIU_IR0            (INT_NUM_IM4_IRL0 + 30)
 437 +#define LTQ_EIU_IR1            (INT_NUM_IM3_IRL0 + 31)
 438 +#define LTQ_EIU_IR2            (INT_NUM_IM1_IRL0 + 26)
 439 +#define LTQ_EIU_IR3            INT_NUM_IM1_IRL0
 440 +#define LTQ_EIU_IR4            (INT_NUM_IM1_IRL0 + 1)
 441 +#define LTQ_EIU_IR5            (INT_NUM_IM1_IRL0 + 2)
 442 +#define LTQ_EIU_IR6            (INT_NUM_IM2_IRL0 + 30)
 443 +
 444 +#define MAX_EIU                        6
 445 +
 446 +/* irqs generated by device attached to the EBU need to be acked in
 447 + * a special manner
 448 + */
 449 +#define LTQ_ICU_EBU_IRQ                22
 450 +
 451 +#define ltq_eiu_w32(x, y)      ltq_w32((x), ltq_eiu_membase + (y))
 452 +#define ltq_eiu_r32(x)         ltq_r32(ltq_eiu_membase + (x))
 453 +
 454 +static unsigned short ltq_eiu_irq[MAX_EIU] = {
 455 +       LTQ_EIU_IR0,
 456 +       LTQ_EIU_IR1,
 457 +       LTQ_EIU_IR2,
 458 +       LTQ_EIU_IR3,
 459 +       LTQ_EIU_IR4,
 460 +       LTQ_EIU_IR5,
 461 +};
 462 +
 463 +static void __iomem *ltq_eiu_membase;
 464 +
 465 +static struct resource ltq_eiu_resource = {
 466 +       .name   = "eiu",
 467 +       .start  = LTQ_EIU_BASE_ADDR,
 468 +       .end    = LTQ_EIU_BASE_ADDR + LTQ_ICU_SIZE - 1,
 469 +       .flags  = IORESOURCE_MEM,
 470 +};
 471 +
 472 +#endif
 473 +
 474 +static struct resource ltq_icu_resource = {
 475 +       .name   = "icu",
 476 +       .start  = LTQ_ICU_BASE_ADDR,
 477 +       .end    = LTQ_ICU_BASE_ADDR + LTQ_ICU_SIZE - 1,
 478 +       .flags  = IORESOURCE_MEM,
 479 +};
 480 +
 481 +#define ltq_icu_w32(x, y)      ltq_w32((x), ltq_icu_membase + (y))
 482 +#define ltq_icu_r32(x)         ltq_r32(ltq_icu_membase + (x))
 483 +
 484 +static void __iomem *ltq_icu_membase;
 485 +
 486 +
 487 +void ltq_disable_irq(struct irq_data *d)
 488 +{
 489 +       u32 ier = LTQ_ICU_IM0_IER;
 490 +       int irq_nr = d->irq - INT_NUM_IRQ0;
 491 +
 492 +       ier += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET);
 493 +       irq_nr %= INT_NUM_IM_OFFSET;
 494 +       ltq_icu_w32(ltq_icu_r32(ier) & ~(1 << irq_nr), ier);
 495 +}
 496 +
 497 +void ltq_mask_and_ack_irq(struct irq_data *d)
 498 +{
 499 +       u32 ier = LTQ_ICU_IM0_IER;
 500 +       u32 isr = LTQ_ICU_IM0_ISR;
 501 +       int irq_nr = d->irq - INT_NUM_IRQ0;
 502 +
 503 +       ier += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET);
 504 +       isr += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET);
 505 +       irq_nr %= INT_NUM_IM_OFFSET;
 506 +       ltq_icu_w32(ltq_icu_r32(ier) & ~(1 << irq_nr), ier);
 507 +       ltq_icu_w32((1 << irq_nr), isr);
 508 +}
 509 +EXPORT_SYMBOL(ltq_mask_and_ack_irq);
 510 +
 511 +static void ltq_ack_irq(struct irq_data *d)
 512 +{
 513 +       u32 isr = LTQ_ICU_IM0_ISR;
 514 +       int irq_nr = d->irq - INT_NUM_IRQ0;
 515 +
 516 +       isr += LTQ_ICU_OFFSET * (irq_nr / INT_NUM_IM_OFFSET);
 517 +       irq_nr %= INT_NUM_IM_OFFSET;
 518 +       ltq_icu_w32((1 << irq_nr), isr);
 519 +}
 520 +
 521 +void ltq_enable_irq(struct irq_data *d)
 522 +{
 523 +       u32 ier = LTQ_ICU_IM0_IER;
 524 +       int irq_nr = d->irq - INT_NUM_IRQ0;
 525 +
 526 +       ier += LTQ_ICU_OFFSET  * (irq_nr / INT_NUM_IM_OFFSET);
 527 +       irq_nr %= INT_NUM_IM_OFFSET;
 528 +       ltq_icu_w32(ltq_icu_r32(ier) | (1 << irq_nr), ier);
 529 +}
 530 +
 531 +#ifdef CONFIG_SOC_TYPE_XWAY
 532 +static unsigned int ltq_startup_eiu_irq(struct irq_data *d)
 533 +{
 534 +       int i;
 535 +       int irq_nr = d->irq - INT_NUM_IRQ0;
 536 +
 537 +       ltq_enable_irq(d);
 538 +       for (i = 0; i < MAX_EIU; i++) {
 539 +               if (irq_nr == ltq_eiu_irq[i]) {
 540 +                       /* low level - we should really handle set_type */
 541 +                       ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_C) |
 542 +                               (0x6 << (i * 4)), LTQ_EIU_EXIN_C);
 543 +                       /* clear all pending */
 544 +                       ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INIC) & ~(1 << i),
 545 +                               LTQ_EIU_EXIN_INIC);
 546 +                       /* enable */
 547 +                       ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) | (1 << i),
 548 +                               LTQ_EIU_EXIN_INEN);
 549 +                       break;
 550 +               }
 551 +       }
 552 +
 553 +       return 0;
 554 +}
 555 +
 556 +static void ltq_shutdown_eiu_irq(struct irq_data *d)
 557 +{
 558 +       int i;
 559 +       int irq_nr = d->irq - INT_NUM_IRQ0;
 560 +
 561 +       ltq_disable_irq(d);
 562 +       for (i = 0; i < MAX_EIU; i++) {
 563 +               if (irq_nr == ltq_eiu_irq[i]) {
 564 +                       /* disable */
 565 +                       ltq_eiu_w32(ltq_eiu_r32(LTQ_EIU_EXIN_INEN) & ~(1 << i),
 566 +                               LTQ_EIU_EXIN_INEN);
 567 +                       break;
 568 +               }
 569 +       }
 570 +}
 571 +#endif
 572 +
 573 +static struct irq_chip ltq_irq_type = {
 574 +       "icu",
 575 +       .irq_enable = ltq_enable_irq,
 576 +       .irq_disable = ltq_disable_irq,
 577 +       .irq_unmask = ltq_enable_irq,
 578 +       .irq_ack = ltq_ack_irq,
 579 +       .irq_mask = ltq_disable_irq,
 580 +       .irq_mask_ack = ltq_mask_and_ack_irq,
 581 +};
 582 +
 583 +#ifdef CONFIG_SOC_TYPE_XWAY
 584 +static struct irq_chip ltq_eiu_type = {
 585 +       "eiu",
 586 +       .irq_startup = ltq_startup_eiu_irq,
 587 +       .irq_shutdown = ltq_shutdown_eiu_irq,
 588 +       .irq_enable = ltq_enable_irq,
 589 +       .irq_disable = ltq_disable_irq,
 590 +       .irq_unmask = ltq_enable_irq,
 591 +       .irq_ack = ltq_ack_irq,
 592 +       .irq_mask = ltq_disable_irq,
 593 +       .irq_mask_ack = ltq_mask_and_ack_irq,
 594 +};
 595 +#endif
 596 +
 597 +static void ltq_hw_irqdispatch(int module)
 598 +{
 599 +       u32 irq;
 600 +
 601 +       irq = ltq_icu_r32(LTQ_ICU_IM0_IOSR + (module * LTQ_ICU_OFFSET));
 602 +       if (irq == 0)
 603 +               return;
 604 +
 605 +       /* silicon bug causes only the msb set to 1 to be valid. all
 606 +        * other bits might be bogus
 607 +        */
 608 +       irq = __fls(irq);
 609 +       do_IRQ((int)irq + INT_NUM_IM0_IRL0 + (INT_NUM_IM_OFFSET * module));
 610 +
 611 +#ifdef CONFIG_SOC_TYPE_XWAY
 612 +       /* if this is a EBU irq, we need to ack it or get a deadlock */
 613 +       if ((irq == LTQ_ICU_EBU_IRQ) && (module == 0))
 614 +               ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_PCC_ISTAT) | 0x10,
 615 +                       LTQ_EBU_PCC_ISTAT);
 616 +#endif
 617 +}
 618 +
 619 +#define DEFINE_HWx_IRQDISPATCH(x)                                      \
 620 +       static void ltq_hw ## x ## _irqdispatch(void)                   \
 621 +       {                                                               \
 622 +               ltq_hw_irqdispatch(x);                                  \
 623 +       }
 624 +DEFINE_HWx_IRQDISPATCH(0)
 625 +DEFINE_HWx_IRQDISPATCH(1)
 626 +DEFINE_HWx_IRQDISPATCH(2)
 627 +DEFINE_HWx_IRQDISPATCH(3)
 628 +DEFINE_HWx_IRQDISPATCH(4)
 629 +
 630 +static void ltq_hw5_irqdispatch(void)
 631 +{
 632 +       do_IRQ(MIPS_CPU_TIMER_IRQ);
 633 +}
 634 +
 635 +asmlinkage void plat_irq_dispatch(void)
 636 +{
 637 +       unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
 638 +       unsigned int i;
 639 +
 640 +       if (pending & CAUSEF_IP7) {
 641 +               do_IRQ(MIPS_CPU_TIMER_IRQ);
 642 +               goto out;
 643 +       } else {
 644 +               for (i = 0; i < 5; i++) {
 645 +                       if (pending & (CAUSEF_IP2 << i)) {
 646 +                               ltq_hw_irqdispatch(i);
 647 +                               goto out;
 648 +                       }
 649 +               }
 650 +       }
 651 +       pr_alert("Spurious IRQ: CAUSE=0x%08x\n", read_c0_status());
 652 +
 653 +out:
 654 +       return;
 655 +}
 656 +
 657 +static struct irqaction cascade = {
 658 +       .handler = no_action,
 659 +       .flags = IRQF_DISABLED,
 660 +       .name = "cascade",
 661 +};
 662 +
 663 +void __init arch_init_irq(void)
 664 +{
 665 +       int i;
 666 +
 667 +       if (insert_resource(&iomem_resource, &ltq_icu_resource) < 0)
 668 +               panic("Failed to insert icu memory\n");
 669 +
 670 +       if (request_mem_region(ltq_icu_resource.start,
 671 +                       resource_size(&ltq_icu_resource), "icu") < 0)
 672 +               panic("Failed to request icu memory\n");
 673 +
 674 +       ltq_icu_membase = ioremap_nocache(ltq_icu_resource.start,
 675 +                               resource_size(&ltq_icu_resource));
 676 +       if (!ltq_icu_membase)
 677 +               panic("Failed to remap icu memory\n");
 678 +
 679 +#ifdef CONFIG_SOC_TYPE_XWAY
 680 +       if (insert_resource(&iomem_resource, &ltq_eiu_resource) < 0)
 681 +               panic("Failed to insert eiu memory\n");
 682 +
 683 +       if (request_mem_region(ltq_eiu_resource.start,
 684 +                       resource_size(&ltq_eiu_resource), "eiu") < 0)
 685 +               panic("Failed to request eiu memory\n");
 686 +
 687 +       ltq_eiu_membase = ioremap_nocache(ltq_eiu_resource.start,
 688 +                               resource_size(&ltq_eiu_resource));
 689 +       if (!ltq_eiu_membase)
 690 +               panic("Failed to remap eiu memory\n");
 691 +#endif
 692 +       /* make sure all irqs are turned off by default */
 693 +       for (i = 0; i < 5; i++)
 694 +               ltq_icu_w32(0, LTQ_ICU_IM0_IER + (i * LTQ_ICU_OFFSET));
 695 +
 696 +       /* clear all possibly pending interrupts */
 697 +       ltq_icu_w32(~0, LTQ_ICU_IM0_ISR + (i * LTQ_ICU_OFFSET));
 698 +
 699 +       mips_cpu_irq_init();
 700 +
 701 +       for (i = 2; i <= 6; i++)
 702 +               setup_irq(i, &cascade);
 703 +
 704 +       if (cpu_has_vint) {
 705 +               pr_info("Setting up vectored interrupts\n");
 706 +               set_vi_handler(2, ltq_hw0_irqdispatch);
 707 +               set_vi_handler(3, ltq_hw1_irqdispatch);
 708 +               set_vi_handler(4, ltq_hw2_irqdispatch);
 709 +               set_vi_handler(5, ltq_hw3_irqdispatch);
 710 +               set_vi_handler(6, ltq_hw4_irqdispatch);
 711 +               set_vi_handler(7, ltq_hw5_irqdispatch);
 712 +       }
 713 +
 714 +       for (i = INT_NUM_IRQ0;
 715 +               i <= (INT_NUM_IRQ0 + (5 * INT_NUM_IM_OFFSET)); i++)
 716 +#ifdef CONFIG_SOC_TYPE_XWAY
 717 +                       if ((i == LTQ_EIU_IR0) || (i == LTQ_EIU_IR1) || (i == LTQ_EIU_IR2))
 718 +                               irq_set_chip_and_handler(i, &ltq_eiu_type, handle_level_irq);
 719 +                       /* EIU3-5 only exist on ar9 and vr9 */
 720 +                       else if (((i == LTQ_EIU_IR3) || (i == LTQ_EIU_IR4) ||
 721 +                               (i == LTQ_EIU_IR5)) && (ltq_is_ar9() || ltq_is_vr9()))
 722 +                               irq_set_chip_and_handler(i, &ltq_eiu_type, handle_level_irq);
 723 +                       else
 724 +#endif
 725 +                               irq_set_chip_and_handler(i, &ltq_irq_type, handle_level_irq);
 726 +
 727 +#if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
 728 +       set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 |
 729 +               IE_IRQ3 | IE_IRQ4 | IE_IRQ5);
 730 +#else
 731 +       set_c0_status(IE_SW0 | IE_SW1 | IE_IRQ0 | IE_IRQ1 |
 732 +               IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5);
 733 +#endif
 734 +}
 735 +
 736 +unsigned int __cpuinit get_c0_compare_int(void)
 737 +{
 738 +       return CP0_LEGACY_COMPARE_IRQ;
 739 +}
 740 --- /dev/null
 741 +++ b/arch/mips/lantiq/prom.c
 742 @@ -0,0 +1,71 @@
 743 +/*
 744 + *  This program is free software; you can redistribute it and/or modify it
 745 + *  under the terms of the GNU General Public License version 2 as published
 746 + *  by the Free Software Foundation.
 747 + *
 748 + * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 749 + */
 750 +
 751 +#include <linux/module.h>
 752 +#include <linux/clk.h>
 753 +#include <asm/bootinfo.h>
 754 +#include <asm/time.h>
 755 +
 756 +#include <lantiq.h>
 757 +
 758 +#include "prom.h"
 759 +#include "clk.h"
 760 +
 761 +static struct ltq_soc_info soc_info;
 762 +
 763 +unsigned int ltq_get_cpu_ver(void)
 764 +{
 765 +       return soc_info.rev;
 766 +}
 767 +EXPORT_SYMBOL(ltq_get_cpu_ver);
 768 +
 769 +unsigned int ltq_get_soc_type(void)
 770 +{
 771 +       return soc_info.type;
 772 +}
 773 +EXPORT_SYMBOL(ltq_get_soc_type);
 774 +
 775 +const char *get_system_type(void)
 776 +{
 777 +       return soc_info.sys_type;
 778 +}
 779 +
 780 +void prom_free_prom_memory(void)
 781 +{
 782 +}
 783 +
 784 +static void __init prom_init_cmdline(void)
 785 +{
 786 +       int argc = fw_arg0;
 787 +       char **argv = (char **) KSEG1ADDR(fw_arg1);
 788 +       int i;
 789 +
 790 +       for (i = 0; i < argc; i++) {
 791 +               char *p = (char *)  KSEG1ADDR(argv[i]);
 792 +
 793 +               if (p && *p) {
 794 +                       strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
 795 +                       strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
 796 +               }
 797 +       }
 798 +}
 799 +
 800 +void __init prom_init(void)
 801 +{
 802 +       struct clk *clk;
 803 +
 804 +       ltq_soc_detect(&soc_info);
 805 +       clk_init();
 806 +       clk = clk_get(0, "cpu");
 807 +       snprintf(soc_info.sys_type, LTQ_SYS_TYPE_LEN - 1, "%s rev1.%d",
 808 +               soc_info.name, soc_info.rev);
 809 +       clk_put(clk);
 810 +       soc_info.sys_type[LTQ_SYS_TYPE_LEN - 1] = '\0';
 811 +       pr_info("SoC: %s\n", soc_info.sys_type);
 812 +       prom_init_cmdline();
 813 +}
 814 --- /dev/null
 815 +++ b/arch/mips/lantiq/prom.h
 816 @@ -0,0 +1,24 @@
 817 +/*
 818 + *  This program is free software; you can redistribute it and/or modify it
 819 + *  under the terms of the GNU General Public License version 2 as published
 820 + *  by the Free Software Foundation.
 821 + *
 822 + * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 823 + */
 824 +
 825 +#ifndef _LTQ_PROM_H__
 826 +#define _LTQ_PROM_H__
 827 +
 828 +#define LTQ_SYS_TYPE_LEN       0x100
 829 +
 830 +struct ltq_soc_info {
 831 +       unsigned char *name;
 832 +       unsigned int rev;
 833 +       unsigned int partnum;
 834 +       unsigned int type;
 835 +       unsigned char sys_type[LTQ_SYS_TYPE_LEN];
 836 +};
 837 +
 838 +extern void ltq_soc_detect(struct ltq_soc_info *i);
 839 +
 840 +#endif
 841 --- /dev/null
 842 +++ b/arch/mips/lantiq/setup.c
 843 @@ -0,0 +1,41 @@
 844 +/*
 845 + *  This program is free software; you can redistribute it and/or modify it
 846 + *  under the terms of the GNU General Public License version 2 as published
 847 + *  by the Free Software Foundation.
 848 + *
 849 + * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
 850 + */
 851 +
 852 +#include <linux/kernel.h>
 853 +#include <linux/module.h>
 854 +#include <linux/io.h>
 855 +#include <linux/ioport.h>
 856 +#include <asm/bootinfo.h>
 857 +
 858 +#include <lantiq_soc.h>
 859 +
 860 +void __init plat_mem_setup(void)
 861 +{
 862 +       /* assume 16M as default incase uboot fails to pass proper ramsize */
 863 +       unsigned long memsize = 16;
 864 +       char **envp = (char **) KSEG1ADDR(fw_arg2);
 865 +
 866 +       ioport_resource.start = IOPORT_RESOURCE_START;
 867 +       ioport_resource.end = IOPORT_RESOURCE_END;
 868 +       iomem_resource.start = IOMEM_RESOURCE_START;
 869 +       iomem_resource.end = IOMEM_RESOURCE_END;
 870 +
 871 +       set_io_port_base((unsigned long) KSEG1);
 872 +
 873 +       while (*envp) {
 874 +               char *e = (char *)KSEG1ADDR(*envp);
 875 +               if (!strncmp(e, "memsize=", 8)) {
 876 +                       e += 8;
 877 +                       if (strict_strtoul(e, 0, &memsize))
 878 +                               pr_warn("bad memsize specified\n");
 879 +               }
 880 +               envp++;
 881 +       }
 882 +       memsize *= 1024 * 1024;
 883 +       add_memory_region(0x00000000, memsize, BOOT_MEM_RAM);
 884 +}
 885 --- a/arch/mips/Kbuild.platforms
 886 +++ b/arch/mips/Kbuild.platforms
 887 @@ -11,6 +11,7 @@ platforms += dec
 888  platforms += emma
 889  platforms += jazz
 890  platforms += jz4740
 891 +platforms += lantiq
 892  platforms += lasat
 893  platforms += loongson
 894  platforms += mipssim