arch/powerpc/platforms/44x/ppc476.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * PowerPC 476FPE board specific routines
   4  *
   5  * Copyright © 2013 Tony Breeds IBM Corporation
   6  * Copyright © 2013 Alistair Popple IBM Corporation
   7  *
   8  * Based on earlier code:
   9  *    Matt Porter <mporter@kernel.crashing.org>
  10  *    Copyright 2002-2005 MontaVista Software Inc.
  11  *
  12  *    Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  13  *    Copyright (c) 2003-2005 Zultys Technologies
  14  *
  15  *    Rewritten and ported to the merged powerpc tree:
  16  *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
  17  *    Copyright © 2011 David Kliekamp IBM Corporation
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/of.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/rtc.h>
  24
  25 #include <asm/machdep.h>
  26 #include <asm/prom.h>
  27 #include <asm/udbg.h>
  28 #include <asm/time.h>
  29 #include <asm/uic.h>
  30 #include <asm/ppc4xx.h>
  31 #include <asm/mpic.h>
  32 #include <asm/mmu.h>
  33 #include <asm/swiotlb.h>
  34
  35 #include <linux/pci.h>
  36 #include <linux/i2c.h>
  37
  38 static const struct of_device_id ppc47x_of_bus[] __initconst = {
  39         { .compatible = "ibm,plb4", },
  40         { .compatible = "ibm,plb6", },
  41         { .compatible = "ibm,opb", },
  42         { .compatible = "ibm,ebc", },
  43         {},
  44 };
  45
  46 /* The EEPROM is missing and the default values are bogus.  This forces USB in
  47  * to EHCI mode */
  48 static void quirk_ppc_currituck_usb_fixup(struct pci_dev *dev)
  49 {
  50         if (of_machine_is_compatible("ibm,currituck")) {
  51                 pci_write_config_dword(dev, 0xe0, 0x0114231f);
  52                 pci_write_config_dword(dev, 0xe4, 0x00006c40);
  53         }
  54 }
  55 DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup);
  56
  57 /* Akebono has an AVR microcontroller attached to the I2C bus
  58  * which is used to power off/reset the system. */
  59
  60 /* AVR I2C Commands */
  61 #define AVR_PWRCTL_CMD (0x26)
  62
  63 /* Flags for the power control I2C commands */
  64 #define AVR_PWRCTL_PWROFF (0x01)
  65 #define AVR_PWRCTL_RESET (0x02)
  66
  67 static struct i2c_client *avr_i2c_client;
  68 static void __noreturn avr_halt_system(int pwrctl_flags)
  69 {
  70         /* Request the AVR to reset the system */
  71         i2c_smbus_write_byte_data(avr_i2c_client,
  72                                   AVR_PWRCTL_CMD, pwrctl_flags);
  73
  74         /* Wait for system to be reset */
  75         while (1)
  76                 ;
  77 }
  78
  79 static void avr_power_off_system(void)
  80 {
  81         avr_halt_system(AVR_PWRCTL_PWROFF);
  82 }
  83
  84 static void __noreturn avr_reset_system(char *cmd)
  85 {
  86         avr_halt_system(AVR_PWRCTL_RESET);
  87 }
  88
  89 static int avr_probe(struct i2c_client *client,
  90                             const struct i2c_device_id *id)
  91 {
  92         avr_i2c_client = client;
  93         ppc_md.restart = avr_reset_system;
  94         pm_power_off = avr_power_off_system;
  95         return 0;
  96 }
  97
  98 static const struct i2c_device_id avr_id[] = {
  99         { "akebono-avr", 0 },
 100         { }
 101 };
 102
 103 static struct i2c_driver avr_driver = {
 104         .driver = {
 105                 .name = "akebono-avr",
 106         },
 107         .probe = avr_probe,
 108         .id_table = avr_id,
 109 };
 110
 111 static int __init ppc47x_device_probe(void)
 112 {
 113         i2c_add_driver(&avr_driver);
 114         of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
 115
 116         return 0;
 117 }
 118 machine_device_initcall(ppc47x, ppc47x_device_probe);
 119
 120 static void __init ppc47x_init_irq(void)
 121 {
 122         struct device_node *np;
 123
 124         /* Find top level interrupt controller */
 125         for_each_node_with_property(np, "interrupt-controller") {
 126                 if (of_get_property(np, "interrupts", NULL) == NULL)
 127                         break;
 128         }
 129         if (np == NULL)
 130                 panic("Can't find top level interrupt controller");
 131
 132         /* Check type and do appropriate initialization */
 133         if (of_device_is_compatible(np, "chrp,open-pic")) {
 134                 /* The MPIC driver will get everything it needs from the
 135                  * device-tree, just pass 0 to all arguments
 136                  */
 137                 struct mpic *mpic =
 138                         mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC     ");
 139                 BUG_ON(mpic == NULL);
 140                 mpic_init(mpic);
 141                 ppc_md.get_irq = mpic_get_irq;
 142         } else
 143                 panic("Unrecognized top level interrupt controller");
 144 }
 145
 146 #ifdef CONFIG_SMP
 147 static void smp_ppc47x_setup_cpu(int cpu)
 148 {
 149         mpic_setup_this_cpu();
 150 }
 151
 152 static int smp_ppc47x_kick_cpu(int cpu)
 153 {
 154         struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
 155         const u64 *spin_table_addr_prop;
 156         u32 *spin_table;
 157         extern void start_secondary_47x(void);
 158
 159         BUG_ON(cpunode == NULL);
 160
 161         /* Assume spin table. We could test for the enable-method in
 162          * the device-tree but currently there's little point as it's
 163          * our only supported method
 164          */
 165         spin_table_addr_prop =
 166                 of_get_property(cpunode, "cpu-release-addr", NULL);
 167
 168         if (spin_table_addr_prop == NULL) {
 169                 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
 170                        cpu);
 171                 return 1;
 172         }
 173
 174         /* Assume it's mapped as part of the linear mapping. This is a bit
 175          * fishy but will work fine for now
 176          *
 177          * XXX: Is there any reason to assume differently?
 178          */
 179         spin_table = (u32 *)__va(*spin_table_addr_prop);
 180         pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
 181
 182         spin_table[3] = cpu;
 183         smp_wmb();
 184         spin_table[1] = __pa(start_secondary_47x);
 185         mb();
 186
 187         return 0;
 188 }
 189
 190 static struct smp_ops_t ppc47x_smp_ops = {
 191         .probe          = smp_mpic_probe,
 192         .message_pass   = smp_mpic_message_pass,
 193         .setup_cpu      = smp_ppc47x_setup_cpu,
 194         .kick_cpu       = smp_ppc47x_kick_cpu,
 195         .give_timebase  = smp_generic_give_timebase,
 196         .take_timebase  = smp_generic_take_timebase,
 197 };
 198
 199 static void __init ppc47x_smp_init(void)
 200 {
 201         if (mmu_has_feature(MMU_FTR_TYPE_47x))
 202                 smp_ops = &ppc47x_smp_ops;
 203 }
 204
 205 #else /* CONFIG_SMP */
 206 static void __init ppc47x_smp_init(void) { }
 207 #endif /* CONFIG_SMP */
 208
 209 static void __init ppc47x_setup_arch(void)
 210 {
 211
 212         /* No need to check the DMA config as we /know/ our windows are all of
 213          * RAM.  Lets hope that doesn't change */
 214         swiotlb_detect_4g();
 215
 216         ppc47x_smp_init();
 217 }
 218
 219 static int board_rev = -1;
 220 static int __init ppc47x_get_board_rev(void)
 221 {
 222         int reg;
 223         u8 *fpga;
 224         struct device_node *np = NULL;
 225
 226         if (of_machine_is_compatible("ibm,currituck")) {
 227                 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga");
 228                 reg = 0;
 229         } else if (of_machine_is_compatible("ibm,akebono")) {
 230                 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga");
 231                 reg = 2;
 232         }
 233
 234         if (!np)
 235                 goto fail;
 236
 237         fpga = (u8 *) of_iomap(np, 0);
 238         of_node_put(np);
 239         if (!fpga)
 240                 goto fail;
 241
 242         board_rev = ioread8(fpga + reg) & 0x03;
 243         pr_info("%s: Found board revision %d\n", __func__, board_rev);
 244         iounmap(fpga);
 245         return 0;
 246
 247 fail:
 248         pr_info("%s: Unable to find board revision\n", __func__);
 249         return 0;
 250 }
 251 machine_arch_initcall(ppc47x, ppc47x_get_board_rev);
 252
 253 /* Use USB controller should have been hardware swizzled but it wasn't :( */
 254 static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
 255 {
 256         if (dev->vendor == 0x1033 && (dev->device == 0x0035 ||
 257                                       dev->device == 0x00e0)) {
 258                 if (board_rev == 0) {
 259                         dev->irq = irq_create_mapping(NULL, 47);
 260                         pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
 261                 } else if (board_rev == 2) {
 262                         dev->irq = irq_create_mapping(NULL, 49);
 263                         pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
 264                 } else {
 265                         pr_alert("%s: Unknown board revision\n", __func__);
 266                 }
 267         }
 268 }
 269
 270 /*
 271  * Called very early, MMU is off, device-tree isn't unflattened
 272  */
 273 static int __init ppc47x_probe(void)
 274 {
 275         if (of_machine_is_compatible("ibm,akebono"))
 276                 return 1;
 277
 278         if (of_machine_is_compatible("ibm,currituck")) {
 279                 ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup;
 280                 return 1;
 281         }
 282
 283         return 0;
 284 }
 285
 286 define_machine(ppc47x) {
 287         .name                   = "PowerPC 47x",
 288         .probe                  = ppc47x_probe,
 289         .progress               = udbg_progress,
 290         .init_IRQ               = ppc47x_init_irq,
 291         .setup_arch             = ppc47x_setup_arch,
 292         .restart                = ppc4xx_reset_system,
 293         .calibrate_decr         = generic_calibrate_decr,
 294 };