root/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c

DEFINITIONS

1. mpc7448_hpc2_exclude_device
2. mpc7448_hpc2_setup_arch
3. mpc7448_hpc2_init_IRQ
4. mpc7448_hpc2_show_cpuinfo
5. mpc7448_hpc2_restart
6. mpc7448_hpc2_probe
7. mpc7448_machine_check_exception
8. define_machine

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * mpc7448_hpc2.c
   4  *
   5  * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
   6  *
   7  * Author: Jacob Pan
   8  *       jacob.pan@freescale.com
   9  * Author: Xianghua Xiao
  10  *       x.xiao@freescale.com
  11  * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
  12  *      Add Flat Device Tree support fot mpc7448hpc2 board
  13  *
  14  * Copyright 2004-2006 Freescale Semiconductor, Inc.
  15  */
  16 
  17 #include <linux/stddef.h>
  18 #include <linux/kernel.h>
  19 #include <linux/pci.h>
  20 #include <linux/kdev_t.h>
  21 #include <linux/console.h>
  22 #include <linux/extable.h>
  23 #include <linux/delay.h>
  24 #include <linux/irq.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/root_dev.h>
  27 #include <linux/serial.h>
  28 #include <linux/tty.h>
  29 #include <linux/serial_core.h>
  30 
  31 #include <asm/time.h>
  32 #include <asm/machdep.h>
  33 #include <asm/prom.h>
  34 #include <asm/udbg.h>
  35 #include <asm/tsi108.h>
  36 #include <asm/pci-bridge.h>
  37 #include <asm/reg.h>
  38 #include <mm/mmu_decl.h>
  39 #include <asm/tsi108_pci.h>
  40 #include <asm/tsi108_irq.h>
  41 #include <asm/mpic.h>
  42 
  43 #undef DEBUG
  44 #ifdef DEBUG
  45 #define DBG(fmt...) do { printk(fmt); } while(0)
  46 #else
  47 #define DBG(fmt...) do { } while(0)
  48 #endif
  49 
  50 #define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
  51 
  52 int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
  53                                 u_char bus, u_char devfn)
  54 {
  55         if (bus == 0 && PCI_SLOT(devfn) == 0)
  56                 return PCIBIOS_DEVICE_NOT_FOUND;
  57         else
  58                 return PCIBIOS_SUCCESSFUL;
  59 }
  60 
  61 static void __init mpc7448_hpc2_setup_arch(void)
  62 {
  63         struct device_node *np;
  64         if (ppc_md.progress)
  65                 ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
  66 
  67         tsi108_csr_vir_base = get_vir_csrbase();
  68 
  69         /* setup PCI host bridge */
  70 #ifdef CONFIG_PCI
  71         for_each_compatible_node(np, "pci", "tsi108-pci")
  72                 tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
  73 
  74         ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
  75         if (ppc_md.progress)
  76                 ppc_md.progress("tsi108: resources set", 0x100);
  77 #endif
  78 
  79         printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
  80         printk(KERN_INFO
  81                "Jointly ported by Freescale and Tundra Semiconductor\n");
  82         printk(KERN_INFO
  83                "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
  84 }
  85 
  86 /*
  87  * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
  88  * from the four external INT pins, PCI interrupts are routed via
  89  * PCI interrupt control registers, it generates internal IRQ23
  90  *
  91  * Interrupt routing on the Taiga Board:
  92  * TSI108:PB_INT[0] -> CPU0:INT#
  93  * TSI108:PB_INT[1] -> CPU0:MCP#
  94  * TSI108:PB_INT[2] -> N/C
  95  * TSI108:PB_INT[3] -> N/C
  96  */
  97 static void __init mpc7448_hpc2_init_IRQ(void)
  98 {
  99         struct mpic *mpic;
 100 #ifdef CONFIG_PCI
 101         unsigned int cascade_pci_irq;
 102         struct device_node *tsi_pci;
 103         struct device_node *cascade_node = NULL;
 104 #endif
 105 
 106         mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
 107                         MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
 108                         24, 0,
 109                         "Tsi108_PIC");
 110 
 111         BUG_ON(mpic == NULL);
 112 
 113         mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
 114 
 115         mpic_init(mpic);
 116 
 117 #ifdef CONFIG_PCI
 118         tsi_pci = of_find_node_by_type(NULL, "pci");
 119         if (tsi_pci == NULL) {
 120                 printk("%s: No tsi108 pci node found !\n", __func__);
 121                 return;
 122         }
 123         cascade_node = of_find_node_by_type(NULL, "pic-router");
 124         if (cascade_node == NULL) {
 125                 printk("%s: No tsi108 pci cascade node found !\n", __func__);
 126                 return;
 127         }
 128 
 129         cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
 130         DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
 131             (u32) cascade_pci_irq);
 132         tsi108_pci_int_init(cascade_node);
 133         irq_set_handler_data(cascade_pci_irq, mpic);
 134         irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
 135 #endif
 136         /* Configure MPIC outputs to CPU0 */
 137         tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
 138 }
 139 
 140 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
 141 {
 142         seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
 143 }
 144 
 145 static void __noreturn mpc7448_hpc2_restart(char *cmd)
 146 {
 147         local_irq_disable();
 148 
 149         /* Set exception prefix high - to the firmware */
 150         _nmask_and_or_msr(0, MSR_IP);
 151 
 152         for (;;) ;              /* Spin until reset happens */
 153 }
 154 
 155 /*
 156  * Called very early, device-tree isn't unflattened
 157  */
 158 static int __init mpc7448_hpc2_probe(void)
 159 {
 160         if (!of_machine_is_compatible("mpc74xx"))
 161                 return 0;
 162         return 1;
 163 }
 164 
 165 static int mpc7448_machine_check_exception(struct pt_regs *regs)
 166 {
 167         const struct exception_table_entry *entry;
 168 
 169         /* Are we prepared to handle this fault */
 170         if ((entry = search_exception_tables(regs->nip)) != NULL) {
 171                 tsi108_clear_pci_cfg_error();
 172                 regs->msr |= MSR_RI;
 173                 regs->nip = extable_fixup(entry);
 174                 return 1;
 175         }
 176         return 0;
 177 }
 178 
 179 define_machine(mpc7448_hpc2){
 180         .name                   = "MPC7448 HPC2",
 181         .probe                  = mpc7448_hpc2_probe,
 182         .setup_arch             = mpc7448_hpc2_setup_arch,
 183         .init_IRQ               = mpc7448_hpc2_init_IRQ,
 184         .show_cpuinfo           = mpc7448_hpc2_show_cpuinfo,
 185         .get_irq                = mpic_get_irq,
 186         .restart                = mpc7448_hpc2_restart,
 187         .calibrate_decr         = generic_calibrate_decr,
 188         .machine_check_exception= mpc7448_machine_check_exception,
 189         .progress               = udbg_progress,
 190 };