platforms/embedded6xx/mpc7448_hpc2.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * mpc7448_hpc2.c
0004  *
0005  * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
0006  *
0007  * Author: Jacob Pan
0008  *   jacob.pan@freescale.com
0009  * Author: Xianghua Xiao
0010  *       x.xiao@freescale.com
0011  * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
0012  *  Add Flat Device Tree support fot mpc7448hpc2 board
0013  *
0014  * Copyright 2004-2006 Freescale Semiconductor, Inc.
0015  */
0016
0017 #include <linux/stddef.h>
0018 #include <linux/kernel.h>
0019 #include <linux/pci.h>
0020 #include <linux/kdev_t.h>
0021 #include <linux/console.h>
0022 #include <linux/extable.h>
0023 #include <linux/delay.h>
0024 #include <linux/irq.h>
0025 #include <linux/seq_file.h>
0026 #include <linux/root_dev.h>
0027 #include <linux/serial.h>
0028 #include <linux/tty.h>
0029 #include <linux/serial_core.h>
0030 #include <linux/of_irq.h>
0031
0032 #include <asm/time.h>
0033 #include <asm/machdep.h>
0034 #include <asm/udbg.h>
0035 #include <asm/tsi108.h>
0036 #include <asm/pci-bridge.h>
0037 #include <asm/reg.h>
0038 #include <mm/mmu_decl.h>
0039 #include <asm/tsi108_pci.h>
0040 #include <asm/tsi108_irq.h>
0041 #include <asm/mpic.h>
0042
0043 #undef DEBUG
0044 #ifdef DEBUG
0045 #define DBG(fmt...) do { printk(fmt); } while(0)
0046 #else
0047 #define DBG(fmt...) do { } while(0)
0048 #endif
0049
0050 #define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
0051
0052 int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
0053                 u_char bus, u_char devfn)
0054 {
0055     if (bus == 0 && PCI_SLOT(devfn) == 0)
0056         return PCIBIOS_DEVICE_NOT_FOUND;
0057     else
0058         return PCIBIOS_SUCCESSFUL;
0059 }
0060
0061 static void __init mpc7448_hpc2_setup_pci(void)
0062 {
0063 #ifdef CONFIG_PCI
0064     struct device_node *np;
0065     if (ppc_md.progress)
0066         ppc_md.progress("mpc7448_hpc2_setup_pci():set_bridge", 0);
0067
0068     /* setup PCI host bridge */
0069     for_each_compatible_node(np, "pci", "tsi108-pci")
0070         tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
0071
0072     ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
0073     if (ppc_md.progress)
0074         ppc_md.progress("tsi108: resources set", 0x100);
0075 #endif
0076 }
0077
0078 static void __init mpc7448_hpc2_setup_arch(void)
0079 {
0080     tsi108_csr_vir_base = get_vir_csrbase();
0081
0082     printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
0083     printk(KERN_INFO
0084            "Jointly ported by Freescale and Tundra Semiconductor\n");
0085     printk(KERN_INFO
0086            "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
0087 }
0088
0089 /*
0090  * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
0091  * from the four external INT pins, PCI interrupts are routed via
0092  * PCI interrupt control registers, it generates internal IRQ23
0093  *
0094  * Interrupt routing on the Taiga Board:
0095  * TSI108:PB_INT[0] -> CPU0:INT#
0096  * TSI108:PB_INT[1] -> CPU0:MCP#
0097  * TSI108:PB_INT[2] -> N/C
0098  * TSI108:PB_INT[3] -> N/C
0099  */
0100 static void __init mpc7448_hpc2_init_IRQ(void)
0101 {
0102     struct mpic *mpic;
0103 #ifdef CONFIG_PCI
0104     unsigned int cascade_pci_irq;
0105     struct device_node *tsi_pci;
0106     struct device_node *cascade_node = NULL;
0107 #endif
0108
0109     mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
0110             MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
0111             24, 0,
0112             "Tsi108_PIC");
0113
0114     BUG_ON(mpic == NULL);
0115
0116     mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
0117
0118     mpic_init(mpic);
0119
0120 #ifdef CONFIG_PCI
0121     tsi_pci = of_find_node_by_type(NULL, "pci");
0122     if (tsi_pci == NULL) {
0123         printk("%s: No tsi108 pci node found !\n", __func__);
0124         return;
0125     }
0126     cascade_node = of_find_node_by_type(NULL, "pic-router");
0127     if (cascade_node == NULL) {
0128         printk("%s: No tsi108 pci cascade node found !\n", __func__);
0129         return;
0130     }
0131
0132     cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
0133     DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
0134         (u32) cascade_pci_irq);
0135     tsi108_pci_int_init(cascade_node);
0136     irq_set_handler_data(cascade_pci_irq, mpic);
0137     irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
0138 #endif
0139     /* Configure MPIC outputs to CPU0 */
0140     tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
0141 }
0142
0143 void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
0144 {
0145     seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
0146 }
0147
0148 static void __noreturn mpc7448_hpc2_restart(char *cmd)
0149 {
0150     local_irq_disable();
0151
0152     /* Set exception prefix high - to the firmware */
0153     mtmsr(mfmsr() | MSR_IP);
0154     isync();
0155
0156     for (;;) ;      /* Spin until reset happens */
0157 }
0158
0159 /*
0160  * Called very early, device-tree isn't unflattened
0161  */
0162 static int __init mpc7448_hpc2_probe(void)
0163 {
0164     if (!of_machine_is_compatible("mpc74xx"))
0165         return 0;
0166     return 1;
0167 }
0168
0169 static int mpc7448_machine_check_exception(struct pt_regs *regs)
0170 {
0171     const struct exception_table_entry *entry;
0172
0173     /* Are we prepared to handle this fault */
0174     if ((entry = search_exception_tables(regs->nip)) != NULL) {
0175         tsi108_clear_pci_cfg_error();
0176         regs_set_recoverable(regs);
0177         regs_set_return_ip(regs, extable_fixup(entry));
0178         return 1;
0179     }
0180     return 0;
0181 }
0182
0183 define_machine(mpc7448_hpc2){
0184     .name           = "MPC7448 HPC2",
0185     .probe          = mpc7448_hpc2_probe,
0186     .setup_arch         = mpc7448_hpc2_setup_arch,
0187     .discover_phbs      = mpc7448_hpc2_setup_pci,
0188     .init_IRQ       = mpc7448_hpc2_init_IRQ,
0189     .show_cpuinfo       = mpc7448_hpc2_show_cpuinfo,
0190     .get_irq        = mpic_get_irq,
0191     .restart        = mpc7448_hpc2_restart,
0192     .calibrate_decr     = generic_calibrate_decr,
0193     .machine_check_exception= mpc7448_machine_check_exception,
0194     .progress       = udbg_progress,
0195 };