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 {
  91         avr_i2c_client = client;
  92         ppc_md.restart = avr_reset_system;
  93         pm_power_off = avr_power_off_system;
  94         return 0;
  95 }
  96
  97 static const struct i2c_device_id avr_id[] = {
  98         { "akebono-avr", 0 },
  99         { }
 100 };
 101
 102 static struct i2c_driver avr_driver = {
 103         .driver = {
 104                 .name = "akebono-avr",
 105         },
 106         .probe_new = avr_probe,
 107         .id_table = avr_id,
 108 };
 109
 110 static int __init ppc47x_device_probe(void)
 111 {
 112         i2c_add_driver(&avr_driver);
 113         of_platform_bus_probe(NULL, ppc47x_of_bus, NULL);
 114
 115         return 0;
 116 }
 117 machine_device_initcall(ppc47x, ppc47x_device_probe);
 118
 119 static void __init ppc47x_init_irq(void)
 120 {
 121         struct device_node *np;
 122
 123         /* Find top level interrupt controller */
 124         for_each_node_with_property(np, "interrupt-controller") {
 125                 if (of_get_property(np, "interrupts", NULL) == NULL)
 126                         break;
 127         }
 128         if (np == NULL)
 129                 panic("Can't find top level interrupt controller");
 130
 131         /* Check type and do appropriate initialization */
 132         if (of_device_is_compatible(np, "chrp,open-pic")) {
 133                 /* The MPIC driver will get everything it needs from the
 134                  * device-tree, just pass 0 to all arguments
 135                  */
 136                 struct mpic *mpic =
 137                         mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC     ");
 138                 BUG_ON(mpic == NULL);
 139                 mpic_init(mpic);
 140                 ppc_md.get_irq = mpic_get_irq;
 141         } else
 142                 panic("Unrecognized top level interrupt controller");
 143 }
 144
 145 #ifdef CONFIG_SMP
 146 static void smp_ppc47x_setup_cpu(int cpu)
 147 {
 148         mpic_setup_this_cpu();
 149 }
 150
 151 static int smp_ppc47x_kick_cpu(int cpu)
 152 {
 153         struct device_node *cpunode = of_get_cpu_node(cpu, NULL);
 154         const u64 *spin_table_addr_prop;
 155         u32 *spin_table;
 156         extern void start_secondary_47x(void);
 157
 158         BUG_ON(cpunode == NULL);
 159
 160         /* Assume spin table. We could test for the enable-method in
 161          * the device-tree but currently there's little point as it's
 162          * our only supported method
 163          */
 164         spin_table_addr_prop =
 165                 of_get_property(cpunode, "cpu-release-addr", NULL);
 166
 167         if (spin_table_addr_prop == NULL) {
 168                 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n",
 169                        cpu);
 170                 return 1;
 171         }
 172
 173         /* Assume it's mapped as part of the linear mapping. This is a bit
 174          * fishy but will work fine for now
 175          *
 176          * XXX: Is there any reason to assume differently?
 177          */
 178         spin_table = (u32 *)__va(*spin_table_addr_prop);
 179         pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table);
 180
 181         spin_table[3] = cpu;
 182         smp_wmb();
 183         spin_table[1] = __pa(start_secondary_47x);
 184         mb();
 185
 186         return 0;
 187 }
 188
 189 static struct smp_ops_t ppc47x_smp_ops = {
 190         .probe          = smp_mpic_probe,
 191         .message_pass   = smp_mpic_message_pass,
 192         .setup_cpu      = smp_ppc47x_setup_cpu,
 193         .kick_cpu       = smp_ppc47x_kick_cpu,
 194         .give_timebase  = smp_generic_give_timebase,
 195         .take_timebase  = smp_generic_take_timebase,
 196 };
 197
 198 static void __init ppc47x_smp_init(void)
 199 {
 200         if (mmu_has_feature(MMU_FTR_TYPE_47x))
 201                 smp_ops = &ppc47x_smp_ops;
 202 }
 203
 204 #else /* CONFIG_SMP */
 205 static void __init ppc47x_smp_init(void) { }
 206 #endif /* CONFIG_SMP */
 207
 208 static void __init ppc47x_setup_arch(void)
 209 {
 210
 211         /* No need to check the DMA config as we /know/ our windows are all of
 212          * RAM.  Lets hope that doesn't change */
 213         swiotlb_detect_4g();
 214
 215         ppc47x_smp_init();
 216 }
 217
 218 static int board_rev = -1;
 219 static int __init ppc47x_get_board_rev(void)
 220 {
 221         int reg;
 222         u8 *fpga;
 223         struct device_node *np = NULL;
 224
 225         if (of_machine_is_compatible("ibm,currituck")) {
 226                 np = of_find_compatible_node(NULL, NULL, "ibm,currituck-fpga");
 227                 reg = 0;
 228         } else if (of_machine_is_compatible("ibm,akebono")) {
 229                 np = of_find_compatible_node(NULL, NULL, "ibm,akebono-fpga");
 230                 reg = 2;
 231         }
 232
 233         if (!np)
 234                 goto fail;
 235
 236         fpga = (u8 *) of_iomap(np, 0);
 237         of_node_put(np);
 238         if (!fpga)
 239                 goto fail;
 240
 241         board_rev = ioread8(fpga + reg) & 0x03;
 242         pr_info("%s: Found board revision %d\n", __func__, board_rev);
 243         iounmap(fpga);
 244         return 0;
 245
 246 fail:
 247         pr_info("%s: Unable to find board revision\n", __func__);
 248         return 0;
 249 }
 250 machine_arch_initcall(ppc47x, ppc47x_get_board_rev);
 251
 252 /* Use USB controller should have been hardware swizzled but it wasn't :( */
 253 static void ppc47x_pci_irq_fixup(struct pci_dev *dev)
 254 {
 255         if (dev->vendor == 0x1033 && (dev->device == 0x0035 ||
 256                                       dev->device == 0x00e0)) {
 257                 if (board_rev == 0) {
 258                         dev->irq = irq_create_mapping(NULL, 47);
 259                         pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
 260                 } else if (board_rev == 2) {
 261                         dev->irq = irq_create_mapping(NULL, 49);
 262                         pr_info("%s: Mapping irq %d\n", __func__, dev->irq);
 263                 } else {
 264                         pr_alert("%s: Unknown board revision\n", __func__);
 265                 }
 266         }
 267 }
 268
 269 /*
 270  * Called very early, MMU is off, device-tree isn't unflattened
 271  */
 272 static int __init ppc47x_probe(void)
 273 {
 274         if (of_machine_is_compatible("ibm,akebono"))
 275                 return 1;
 276
 277         if (of_machine_is_compatible("ibm,currituck")) {
 278                 ppc_md.pci_irq_fixup = ppc47x_pci_irq_fixup;
 279                 return 1;
 280         }
 281
 282         return 0;
 283 }
 284
 285 define_machine(ppc47x) {
 286         .name                   = "PowerPC 47x",
 287         .probe                  = ppc47x_probe,
 288         .progress               = udbg_progress,
 289         .init_IRQ               = ppc47x_init_irq,
 290         .setup_arch             = ppc47x_setup_arch,
 291         .restart                = ppc4xx_reset_system,
 292         .calibrate_decr         = generic_calibrate_decr,
 293 };