linux/arch/powerpc/platforms/44x/ppc476.c
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   1/*
   2 * PowerPC 476FPE board specific routines
   3 *
   4 * Copyright \xC2\xA9 2013 Tony Breeds IBM Corporation
   5 * Copyright \xC2\xA9 2013 Alistair Popple IBM Corporation
   6 *
   7 * Based on earlier code:
   8 *    Matt Porter <mporter@kernel.crashing.org>
   9 *    Copyright 2002-2005 MontaVista Software Inc.
  10 *
  11 *    Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  12 *    Copyright (c) 2003-2005 Zultys Technologies
  13 *
  14 *    Rewritten and ported to the merged powerpc tree:
  15 *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
  16 *    Copyright \xC2\xA9 2011 David Kliekamp IBM Corporation
  17 *
  18 * This program is free software; you can redistribute  it and/or modify it
  19 * under  the terms of  the GNU General  Public License as published by the
  20 * Free Software Foundation;  either version 2 of the  License, or (at your
  21 * option) any later version.
  22 */
  23
  24#include <linux/init.h>
  25#include <linux/of.h>
  26#include <linux/of_platform.h>
  27#include <linux/rtc.h>
  28
  29#include <asm/machdep.h>
  30#include <asm/prom.h>
  31#include <asm/udbg.h>
  32#include <asm/time.h>
  33#include <asm/uic.h>
  34#include <asm/ppc4xx.h>
  35#include <asm/mpic.h>
  36#include <asm/mmu.h>
  37
  38#include <linux/pci.h>
  39#include <linux/i2c.h>
  40
  41static const struct of_device_id ppc47x_of_bus[] __initconst = {
  42        { .compatible = "ibm,plb4", },
  43        { .compatible = "ibm,plb6", },
  44        { .compatible = "ibm,opb", },
  45        { .compatible = "ibm,ebc", },
  46        {},
  47};
  48
  49/* The EEPROM is missing and the default values are bogus.  This forces USB in
  50 * to EHCI mode */
  51static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
  52{
  53        if (of_machine_is_compatible("ibm,currituck")) {
  54                pci_write_config_dword(dev, 0xe0, 0x0114231f);
  55                pci_write_config_dword(dev, 0xe4, 0x00006c40);
  56        }
  57}
  58DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
  59
  60/* Akebono has an AVR microcontroller attached to the I2C bus
  61 * which is used to power off/reset the system. */
  62
  63/* AVR I2C Commands */
  64#define AVR_PWRCTL_CMD (0x26)
  65
  66/* Flags for the power control I2C commands */
  67#define AVR_PWRCTL_PWROFF (0x01)
  68#define AVR_PWRCTL_RESET (0x02)
  69
  70static struct i2c_client *avr_i2c_client;
  71static void avr_halt_system(int pwrctl_flags)
  72{
  73        /* Request the AVR to reset the system */
  74        i2c_smbus_write_byte_data(avr_i2c_client,
  75                                  AVR_PWRCTL_CMD, pwrctl_flags);
  76
  77        /* Wait for system to be reset */
  78        while (1)
  79                ;
  80}
  81
  82static void avr_power_off_system(void)
  83{
  84        avr_halt_system(AVR_PWRCTL_PWROFF);
  85}
  86
  87static void avr_reset_system(char *cmd)
  88{
  89        avr_halt_system(AVR_PWRCTL_RESET);
  90}
  91
  92static int avr_probe(struct i2c_client *client,
  93                            const struct i2c_device_id *id)
  94{
  95        avr_i2c_client = client;
  96        ppc_md.restart = avr_reset_system;
  97        pm_power_off = avr_power_off_system;
  98        return 0;
  99}
 100
 101static const struct i2c_device_id avr_id[] = {
 102        { "akebono-avr", 0 },
 103        { }
 104};
 105
 106static struct i2c_driver avr_driver = {
 107        .driver = {
 108                .name = "akebono-avr",
 109        },
 110        .probe = avr_probe,
 111        .id_table = avr_id,
 112};
 113
 114static int __init ppc47x_device_probe(void)
 115{
 116        i2c_add_driver(&avr_driver);
 117        of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
 118
 119        return 0;
 120}
 121machine_device_initcall(ppc47x, ppc47x_device_probe);
 122
 123static void __init ppc47x_init_irq(void)
 124{
 125        struct device_node *np;
 126
 127        /* Find top level interrupt controller */
 128        for_each_node_with_property(np, "interrupt-controller") {
 129                if (of_get_property(np, "interrupts", NULL) == NULL)
 130                        break;
 131        }
 132        if (np == NULL)
 133                panic("Can't find top level interrupt controller");
 134
 135        /* Check type and do appropriate initialization */
 136        if (of_device_is_compatible(np, "chrp,open-pic")) {
 137                /* The MPIC driver will get everything it needs from the
 138                 * device-tree, just pass 0 to all arguments
 139                 */
 140                struct mpic *mpic =
 141                        mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC     ");
 142                BUG_ON(mpic == NULL);
 143                mpic_init(mpic);
 144                ppc_md.get_irq = mpic_get_irq;
 145        } else
 146                panic("Unrecognized top level interrupt controller");
 147}
 148
 149#ifdef CONFIG_SMP
 150static void smp_ppc47x_setup_cpu(int cpu)
 151{
 152        mpic_setup_this_cpu();
 153}
 154
 155static int smp_ppc47x_kick_cpu(int cpu)
 156{
 157        struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
 158        const u64 *spin_table_addr_prop;
 159        u32 *spin_table;
 160        extern void start_secondary_47x(void);
 161
 162        BUG_ON(cpunode == NULL);
 163
 164        /* Assume spin table. We could test for the enable-method in
 165         * the device-tree but currently there's little point as it's
 166         * our only supported method
 167         */
 168        spin_table_addr_prop =
 169                of_get_property(cpunode, "cpu-release-addr", NULL);
 170
 171        if (spin_table_addr_prop == NULL) {
 172                pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
 173                       cpu);
 174                return 1;
 175        }
 176
 177        /* Assume it's mapped as part of the linear mapping. This is a bit
 178         * fishy but will work fine for now
 179         *
 180         * XXX: Is there any reason to assume differently?
 181         */
 182        spin_table = (u32 *)__va(*spin_table_addr_prop);
 183        pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
 184
 185        spin_table[3] = cpu;
 186        smp_wmb();
 187        spin_table[1] = __pa(start_secondary_47x);
 188        mb();
 189
 190        return 0;
 191}
 192
 193static struct smp_ops_t ppc47x_smp_ops = {
 194        .probe          = smp_mpic_probe,
 195        .message_pass   = smp_mpic_message_pass,
 196        .setup_cpu      = smp_ppc47x_setup_cpu,
 197        .kick_cpu       = smp_ppc47x_kick_cpu,
 198        .give_timebase  = smp_generic_give_timebase,
 199        .take_timebase  = smp_generic_take_timebase,
 200};
 201
 202static void __init ppc47x_smp_init(void)
 203{
 204        if (mmu_has_feature(MMU_FTR_TYPE_47x))
 205                smp_ops = &ppc47x_smp_ops;
 206}
 207
 208#else /* CONFIG_SMP */
 209static void __init ppc47x_smp_init(void) { }
 210#endif /* CONFIG_SMP */
 211
 212static void __init ppc47x_setup_arch(void)
 213{
 214
 215        /* No need to check the DMA config as we /know/ our windows are all of
 216         * RAM.  Lets hope that doesn't change */
 217        swiotlb_detect_4g();
 218
 219        ppc47x_smp_init();
 220}
 221
 222static int board_rev = -1;
 223static int __init ppc47x_get_board_rev(void)
 224{
 225        int reg;
 226        u8 *fpga;
 227        struct device_node *np = NULL;
 228
 229        if (of_machine_is_compatible("ibm,currituck")) {
 230                np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga");
 231                reg = 0;
 232        } else if (of_machine_is_compatible("ibm,akebono")) {
 233                np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga");
 234                reg = 2;
 235        }
 236
 237        if (!np)
 238                goto fail;
 239
 240        fpga = (u8 *) of_iomap(np, 0);
 241        of_node_put(np);
 242        if (!fpga)
 243                goto fail;
 244
 245        board_rev = ioread8(fpga + reg) & 0x03;
 246        pr_info("%s: Found board revision %d\n", __func__, board_rev);
 247        iounmap(fpga);
 248        return 0;
 249
 250fail:
 251        pr_info("%s: Unable to find board revision\n", __func__);
 252        return 0;
 253}
 254machine_arch_initcall(ppc47x, ppc47x_get_board_rev);
 255
 256/* Use USB controller should have been hardware swizzled but it wasn't :( */
 257static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
 258{
 259        if (dev->vendor == 0x1033 && (dev->device == 0x0035 ||
 260                                      dev->device == 0x00e0)) {
 261                if (board_rev == 0) {
 262                        dev->irq = irq_create_mapping(NULL, 47);
 263                        pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
 264                } else if (board_rev == 2) {
 265                        dev->irq = irq_create_mapping(NULL, 49);
 266                        pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
 267                } else {
 268                        pr_alert("%s: Unknown board revision\n", __func__);
 269                }
 270        }
 271}
 272
 273/*
 274 * Called very early, MMU is off, device-tree isn't unflattened
 275 */
 276static int __init ppc47x_probe(void)
 277{
 278        unsigned long root = of_get_flat_dt_root();
 279
 280        if (of_flat_dt_is_compatible(root, "ibm,akebono"))
 281                return 1;
 282
 283        if (of_flat_dt_is_compatible(root, "ibm,currituck")) {
 284                ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup;
 285                return 1;
 286        }
 287
 288        return 0;
 289}
 290
 291define_machine(ppc47x) {
 292        .name                   = "PowerPC 47x",
 293        .probe                  = ppc47x_probe,
 294        .progress               = udbg_progress,
 295        .init_IRQ               = ppc47x_init_irq,
 296        .setup_arch             = ppc47x_setup_arch,
 297        .restart                = ppc4xx_reset_system,
 298        .calibrate_decr         = generic_calibrate_decr,
 299};
 300
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