1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * misc setup functions for MPC83xx 4 * 5 * Maintainer: Kumar Gala <galak@kernel.crashing.org> 6 */ 7 8 #include <linux/stddef.h> 9 #include <linux/kernel.h> 10 #include <linux/of_platform.h> 11 #include <linux/pci.h> 12 13 #include <asm/debug.h> 14 #include <asm/io.h> 15 #include <asm/hw_irq.h> 16 #include <asm/ipic.h> 17 #include <soc/fsl/qe/qe_ic.h> 18 #include <sysdev/fsl_soc.h> 19 #include <sysdev/fsl_pci.h> 20 21 #include <mm/mmu_decl.h> 22 23 #include "mpc83xx.h" 24 25 static __be32 __iomem *restart_reg_base; 26 27 static int __init mpc83xx_restart_init(void) 28 { 29 /* map reset restart_reg_baseister space */ 30 restart_reg_base = ioremap(get_immrbase() + 0x900, 0xff); 31 32 return 0; 33 } 34 35 arch_initcall(mpc83xx_restart_init); 36 37 void __noreturn mpc83xx_restart(char *cmd) 38 { 39 #define RST_OFFSET 0x00000900 40 #define RST_PROT_REG 0x00000018 41 #define RST_CTRL_REG 0x0000001c 42 43 local_irq_disable(); 44 45 if (restart_reg_base) { 46 /* enable software reset "RSTE" */ 47 out_be32(restart_reg_base + (RST_PROT_REG >> 2), 0x52535445); 48 49 /* set software hard reset */ 50 out_be32(restart_reg_base + (RST_CTRL_REG >> 2), 0x2); 51 } else { 52 printk (KERN_EMERG "Error: Restart registers not mapped, spinning!\n"); 53 } 54 55 for (;;) ; 56 } 57 58 long __init mpc83xx_time_init(void) 59 { 60 #define SPCR_OFFSET 0x00000110 61 #define SPCR_TBEN 0x00400000 62 __be32 __iomem *spcr = ioremap(get_immrbase() + SPCR_OFFSET, 4); 63 __be32 tmp; 64 65 tmp = in_be32(spcr); 66 out_be32(spcr, tmp | SPCR_TBEN); 67 68 iounmap(spcr); 69 70 return 0; 71 } 72 73 void __init mpc83xx_ipic_init_IRQ(void) 74 { 75 struct device_node *np; 76 77 /* looking for fsl,pq2pro-pic which is asl compatible with fsl,ipic */ 78 np = of_find_compatible_node(NULL, NULL, "fsl,ipic"); 79 if (!np) 80 np = of_find_node_by_type(NULL, "ipic"); 81 if (!np) 82 return; 83 84 ipic_init(np, 0); 85 86 of_node_put(np); 87 88 /* Initialize the default interrupt mapping priorities, 89 * in case the boot rom changed something on us. 90 */ 91 ipic_set_default_priority(); 92 } 93 94 #ifdef CONFIG_QUICC_ENGINE 95 void __init mpc83xx_qe_init_IRQ(void) 96 { 97 struct device_node *np; 98 99 np = of_find_compatible_node(NULL, NULL, "fsl,qe-ic"); 100 if (!np) { 101 np = of_find_node_by_type(NULL, "qeic"); 102 if (!np) 103 return; 104 } 105 qe_ic_init(np, 0, qe_ic_cascade_low_ipic, qe_ic_cascade_high_ipic); 106 of_node_put(np); 107 } 108 109 void __init mpc83xx_ipic_and_qe_init_IRQ(void) 110 { 111 mpc83xx_ipic_init_IRQ(); 112 mpc83xx_qe_init_IRQ(); 113 } 114 #endif /* CONFIG_QUICC_ENGINE */ 115 116 static const struct of_device_id of_bus_ids[] __initconst = { 117 { .type = "soc", }, 118 { .compatible = "soc", }, 119 { .compatible = "simple-bus" }, 120 { .compatible = "gianfar" }, 121 { .compatible = "gpio-leds", }, 122 { .type = "qe", }, 123 { .compatible = "fsl,qe", }, 124 {}, 125 }; 126 127 int __init mpc83xx_declare_of_platform_devices(void) 128 { 129 of_platform_bus_probe(NULL, of_bus_ids, NULL); 130 return 0; 131 } 132 133 #ifdef CONFIG_PCI 134 void __init mpc83xx_setup_pci(void) 135 { 136 struct device_node *np; 137 138 for_each_compatible_node(np, "pci", "fsl,mpc8349-pci") 139 mpc83xx_add_bridge(np); 140 for_each_compatible_node(np, "pci", "fsl,mpc8314-pcie") 141 mpc83xx_add_bridge(np); 142 } 143 #endif 144 145 void __init mpc83xx_setup_arch(void) 146 { 147 if (ppc_md.progress) 148 ppc_md.progress("mpc83xx_setup_arch()", 0); 149 150 if (!__map_without_bats) { 151 phys_addr_t immrbase = get_immrbase(); 152 int immrsize = IS_ALIGNED(immrbase, SZ_2M) ? SZ_2M : SZ_1M; 153 unsigned long va = fix_to_virt(FIX_IMMR_BASE); 154 155 setbat(-1, va, immrbase, immrsize, PAGE_KERNEL_NCG); 156 update_bats(); 157 } 158 159 mpc83xx_setup_pci(); 160 } 161 162 int machine_check_83xx(struct pt_regs *regs) 163 { 164 u32 mask = 1 << (31 - IPIC_MCP_WDT); 165 166 if (!(regs->msr & SRR1_MCE_MCP) || !(ipic_get_mcp_status() & mask)) 167 return machine_check_generic(regs); 168 ipic_clear_mcp_status(mask); 169 170 if (debugger_fault_handler(regs)) 171 return 1; 172 173 die("Watchdog NMI Reset", regs, 0); 174 175 return 1; 176 } 177