arch/powerpc/platforms/85xx/sbc8548.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Wind River SBC8548 setup and early boot code.
   4  *
   5  * Copyright 2007 Wind River Systems Inc.
   6  *
   7  * By Paul Gortmaker (see MAINTAINERS for contact information)
   8  *
   9  * Based largely on the MPC8548CDS support - Copyright 2005 Freescale Inc.
  10  */
  11
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/errno.h>
  16 #include <linux/reboot.h>
  17 #include <linux/pci.h>
  18 #include <linux/kdev_t.h>
  19 #include <linux/major.h>
  20 #include <linux/console.h>
  21 #include <linux/delay.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/initrd.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/fsl_devices.h>
  26 #include <linux/of_platform.h>
  27
  28 #include <asm/pgtable.h>
  29 #include <asm/page.h>
  30 #include <linux/atomic.h>
  31 #include <asm/time.h>
  32 #include <asm/io.h>
  33 #include <asm/machdep.h>
  34 #include <asm/ipic.h>
  35 #include <asm/pci-bridge.h>
  36 #include <asm/irq.h>
  37 #include <mm/mmu_decl.h>
  38 #include <asm/prom.h>
  39 #include <asm/udbg.h>
  40 #include <asm/mpic.h>
  41
  42 #include <sysdev/fsl_soc.h>
  43 #include <sysdev/fsl_pci.h>
  44
  45 #include "mpc85xx.h"
  46
  47 static int sbc_rev;
  48
  49 static void __init sbc8548_pic_init(void)
  50 {
  51         struct mpic *mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN,
  52                         0, 256, " OpenPIC  ");
  53         BUG_ON(mpic == NULL);
  54         mpic_init(mpic);
  55 }
  56
  57 /* Extract the HW Rev from the EPLD on the board */
  58 static int __init sbc8548_hw_rev(void)
  59 {
  60         struct device_node *np;
  61         struct resource res;
  62         unsigned int *rev;
  63         int board_rev = 0;
  64
  65         np = of_find_compatible_node(NULL, NULL, "hw-rev");
  66         if (np == NULL) {
  67                 printk("No HW-REV found in DTB.\n");
  68                 return -ENODEV;
  69         }
  70
  71         of_address_to_resource(np, 0, &res);
  72         of_node_put(np);
  73
  74         rev = ioremap(res.start,sizeof(unsigned int));
  75         board_rev = (*rev) >> 28;
  76         iounmap(rev);
  77
  78         return board_rev;
  79 }
  80
  81 /*
  82  * Setup the architecture
  83  */
  84 static void __init sbc8548_setup_arch(void)
  85 {
  86         if (ppc_md.progress)
  87                 ppc_md.progress("sbc8548_setup_arch()", 0);
  88
  89         fsl_pci_assign_primary();
  90
  91         sbc_rev = sbc8548_hw_rev();
  92 }
  93
  94 static void sbc8548_show_cpuinfo(struct seq_file *m)
  95 {
  96         uint pvid, svid, phid1;
  97
  98         pvid = mfspr(SPRN_PVR);
  99         svid = mfspr(SPRN_SVR);
 100
 101         seq_printf(m, "Vendor\t\t: Wind River\n");
 102         seq_printf(m, "Machine\t\t: SBC8548 v%d\n", sbc_rev);
 103         seq_printf(m, "PVR\t\t: 0x%x\n", pvid);
 104         seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 105
 106         /* Display cpu Pll setting */
 107         phid1 = mfspr(SPRN_HID1);
 108         seq_printf(m, "PLL setting\t: 0x%x\n", ((phid1 >> 24) & 0x3f));
 109 }
 110
 111 machine_arch_initcall(sbc8548, mpc85xx_common_publish_devices);
 112
 113 /*
 114  * Called very early, device-tree isn't unflattened
 115  */
 116 static int __init sbc8548_probe(void)
 117 {
 118         return of_machine_is_compatible("SBC8548");
 119 }
 120
 121 define_machine(sbc8548) {
 122         .name           = "SBC8548",
 123         .probe          = sbc8548_probe,
 124         .setup_arch     = sbc8548_setup_arch,
 125         .init_IRQ       = sbc8548_pic_init,
 126         .show_cpuinfo   = sbc8548_show_cpuinfo,
 127         .get_irq        = mpic_get_irq,
 128 #ifdef CONFIG_PCI
 129         .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 130         .pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
 131 #endif
 132         .calibrate_decr = generic_calibrate_decr,
 133         .progress       = udbg_progress,
 134 };