1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Board setup routines for the IBM 750GX/CL platform w/ TSI10x bridge 4 * 5 * Copyright 2007 IBM Corporation 6 * 7 * Stephen Winiecki <stevewin@us.ibm.com> 8 * Josh Boyer <jwboyer@linux.vnet.ibm.com> 9 * 10 * Based on code from mpc7448_hpc2.c 11 */ 12 13 #include <linux/stddef.h> 14 #include <linux/kernel.h> 15 #include <linux/pci.h> 16 #include <linux/kdev_t.h> 17 #include <linux/console.h> 18 #include <linux/delay.h> 19 #include <linux/irq.h> 20 #include <linux/seq_file.h> 21 #include <linux/root_dev.h> 22 #include <linux/serial.h> 23 #include <linux/tty.h> 24 #include <linux/serial_core.h> 25 #include <linux/of_platform.h> 26 #include <linux/extable.h> 27 28 #include <asm/time.h> 29 #include <asm/machdep.h> 30 #include <asm/prom.h> 31 #include <asm/udbg.h> 32 #include <asm/tsi108.h> 33 #include <asm/pci-bridge.h> 34 #include <asm/reg.h> 35 #include <mm/mmu_decl.h> 36 #include <asm/tsi108_irq.h> 37 #include <asm/tsi108_pci.h> 38 #include <asm/mpic.h> 39 40 #undef DEBUG 41 42 #define HOLLY_PCI_CFG_PHYS 0x7c000000 43 44 static int holly_exclude_device(struct pci_controller *hose, u_char bus, 45 u_char devfn) 46 { 47 if (bus == 0 && PCI_SLOT(devfn) == 0) 48 return PCIBIOS_DEVICE_NOT_FOUND; 49 else 50 return PCIBIOS_SUCCESSFUL; 51 } 52 53 static void holly_remap_bridge(void) 54 { 55 u32 lut_val, lut_addr; 56 int i; 57 58 printk(KERN_INFO "Remapping PCI bridge\n"); 59 60 /* Re-init the PCI bridge and LUT registers to have mappings that don't 61 * rely on PIBS 62 */ 63 lut_addr = 0x900; 64 for (i = 0; i < 31; i++) { 65 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000201); 66 lut_addr += 4; 67 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0); 68 lut_addr += 4; 69 } 70 71 /* Reserve the last LUT entry for PCI I/O space */ 72 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000241); 73 lut_addr += 4; 74 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0); 75 76 /* Map PCI I/O space */ 77 tsi108_write_reg(TSI108_PCI_PFAB_IO_UPPER, 0x0); 78 tsi108_write_reg(TSI108_PCI_PFAB_IO, 0x1); 79 80 /* Map PCI CFG space */ 81 tsi108_write_reg(TSI108_PCI_PFAB_BAR0_UPPER, 0x0); 82 tsi108_write_reg(TSI108_PCI_PFAB_BAR0, 0x7c000000 | 0x01); 83 84 /* We don't need MEM32 and PRM remapping so disable them */ 85 tsi108_write_reg(TSI108_PCI_PFAB_MEM32, 0x0); 86 tsi108_write_reg(TSI108_PCI_PFAB_PFM3, 0x0); 87 tsi108_write_reg(TSI108_PCI_PFAB_PFM4, 0x0); 88 89 /* Set P2O_BAR0 */ 90 tsi108_write_reg(TSI108_PCI_P2O_BAR0_UPPER, 0x0); 91 tsi108_write_reg(TSI108_PCI_P2O_BAR0, 0xc0000000); 92 93 /* Init the PCI LUTs to do no remapping */ 94 lut_addr = 0x500; 95 lut_val = 0x00000002; 96 97 for (i = 0; i < 32; i++) { 98 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, lut_val); 99 lut_addr += 4; 100 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, 0x40000000); 101 lut_addr += 4; 102 lut_val += 0x02000000; 103 } 104 tsi108_write_reg(TSI108_PCI_P2O_PAGE_SIZES, 0x00007900); 105 106 /* Set 64-bit PCI bus address for system memory */ 107 tsi108_write_reg(TSI108_PCI_P2O_BAR2_UPPER, 0x0); 108 tsi108_write_reg(TSI108_PCI_P2O_BAR2, 0x0); 109 } 110 111 static void __init holly_setup_arch(void) 112 { 113 struct device_node *np; 114 115 if (ppc_md.progress) 116 ppc_md.progress("holly_setup_arch():set_bridge", 0); 117 118 tsi108_csr_vir_base = get_vir_csrbase(); 119 120 /* setup PCI host bridge */ 121 holly_remap_bridge(); 122 123 np = of_find_node_by_type(NULL, "pci"); 124 if (np) 125 tsi108_setup_pci(np, HOLLY_PCI_CFG_PHYS, 1); 126 127 ppc_md.pci_exclude_device = holly_exclude_device; 128 if (ppc_md.progress) 129 ppc_md.progress("tsi108: resources set", 0x100); 130 131 printk(KERN_INFO "PPC750GX/CL Platform\n"); 132 } 133 134 /* 135 * Interrupt setup and service. Interrupts on the holly come 136 * from the four external INT pins, PCI interrupts are routed via 137 * PCI interrupt control registers, it generates internal IRQ23 138 * 139 * Interrupt routing on the Holly Board: 140 * TSI108:PB_INT[0] -> CPU0:INT# 141 * TSI108:PB_INT[1] -> CPU0:MCP# 142 * TSI108:PB_INT[2] -> N/C 143 * TSI108:PB_INT[3] -> N/C 144 */ 145 static void __init holly_init_IRQ(void) 146 { 147 struct mpic *mpic; 148 #ifdef CONFIG_PCI 149 unsigned int cascade_pci_irq; 150 struct device_node *tsi_pci; 151 struct device_node *cascade_node = NULL; 152 #endif 153 154 mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN | 155 MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108, 156 24, 0, 157 "Tsi108_PIC"); 158 159 BUG_ON(mpic == NULL); 160 161 mpic_assign_isu(mpic, 0, mpic->paddr + 0x100); 162 163 mpic_init(mpic); 164 165 #ifdef CONFIG_PCI 166 tsi_pci = of_find_node_by_type(NULL, "pci"); 167 if (tsi_pci == NULL) { 168 printk(KERN_ERR "%s: No tsi108 pci node found !\n", __func__); 169 return; 170 } 171 172 cascade_node = of_find_node_by_type(NULL, "pic-router"); 173 if (cascade_node == NULL) { 174 printk(KERN_ERR "%s: No tsi108 pci cascade node found !\n", __func__); 175 return; 176 } 177 178 cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0); 179 pr_debug("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__, (u32) cascade_pci_irq); 180 tsi108_pci_int_init(cascade_node); 181 irq_set_handler_data(cascade_pci_irq, mpic); 182 irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade); 183 #endif 184 /* Configure MPIC outputs to CPU0 */ 185 tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0); 186 } 187 188 static void holly_show_cpuinfo(struct seq_file *m) 189 { 190 seq_printf(m, "vendor\t\t: IBM\n"); 191 seq_printf(m, "machine\t\t: PPC750 GX/CL\n"); 192 } 193 194 static void __noreturn holly_restart(char *cmd) 195 { 196 __be32 __iomem *ocn_bar1 = NULL; 197 unsigned long bar; 198 struct device_node *bridge = NULL; 199 const void *prop; 200 int size; 201 phys_addr_t addr = 0xc0000000; 202 203 local_irq_disable(); 204 205 bridge = of_find_node_by_type(NULL, "tsi-bridge"); 206 if (bridge) { 207 prop = of_get_property(bridge, "reg", &size); 208 addr = of_translate_address(bridge, prop); 209 } 210 addr += (TSI108_PB_OFFSET + 0x414); 211 212 ocn_bar1 = ioremap(addr, 0x4); 213 214 /* Turn on the BOOT bit so the addresses are correctly 215 * routed to the HLP interface */ 216 bar = ioread32be(ocn_bar1); 217 bar |= 2; 218 iowrite32be(bar, ocn_bar1); 219 iosync(); 220 221 /* Set SRR0 to the reset vector and turn on MSR_IP */ 222 mtspr(SPRN_SRR0, 0xfff00100); 223 mtspr(SPRN_SRR1, MSR_IP); 224 225 /* Do an rfi to jump back to firmware. Somewhat evil, 226 * but it works 227 */ 228 __asm__ __volatile__("rfi" : : : "memory"); 229 230 /* Spin until reset happens. Shouldn't really get here */ 231 for (;;) ; 232 } 233 234 /* 235 * Called very early, device-tree isn't unflattened 236 */ 237 static int __init holly_probe(void) 238 { 239 if (!of_machine_is_compatible("ibm,holly")) 240 return 0; 241 return 1; 242 } 243 244 static int ppc750_machine_check_exception(struct pt_regs *regs) 245 { 246 const struct exception_table_entry *entry; 247 248 /* Are we prepared to handle this fault */ 249 if ((entry = search_exception_tables(regs->nip)) != NULL) { 250 tsi108_clear_pci_cfg_error(); 251 regs->msr |= MSR_RI; 252 regs->nip = extable_fixup(entry); 253 return 1; 254 } 255 return 0; 256 } 257 258 define_machine(holly){ 259 .name = "PPC750 GX/CL TSI", 260 .probe = holly_probe, 261 .setup_arch = holly_setup_arch, 262 .init_IRQ = holly_init_IRQ, 263 .show_cpuinfo = holly_show_cpuinfo, 264 .get_irq = mpic_get_irq, 265 .restart = holly_restart, 266 .calibrate_decr = generic_calibrate_decr, 267 .machine_check_exception = ppc750_machine_check_exception, 268 .progress = udbg_progress, 269 }; 270