1 /* 2 * Board setup routines for the IBM 750GX/CL platform w/ TSI10x bridge 3 * 4 * Copyright 2007 IBM Corporation 5 * 6 * Stephen Winiecki <stevewin@us.ibm.com> 7 * Josh Boyer <jwboyer@linux.vnet.ibm.com> 8 * 9 * Based on code from mpc7448_hpc2.c 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * version 2 as published by the Free Software Foundation. 14 */ 15 16 #include <linux/stddef.h> 17 #include <linux/kernel.h> 18 #include <linux/pci.h> 19 #include <linux/kdev_t.h> 20 #include <linux/console.h> 21 #include <linux/delay.h> 22 #include <linux/irq.h> 23 #include <linux/seq_file.h> 24 #include <linux/root_dev.h> 25 #include <linux/serial.h> 26 #include <linux/tty.h> 27 #include <linux/serial_core.h> 28 #include <linux/of_platform.h> 29 #include <linux/module.h> 30 31 #include <asm/system.h> 32 #include <asm/time.h> 33 #include <asm/machdep.h> 34 #include <asm/prom.h> 35 #include <asm/udbg.h> 36 #include <asm/tsi108.h> 37 #include <asm/pci-bridge.h> 38 #include <asm/reg.h> 39 #include <mm/mmu_decl.h> 40 #include <asm/tsi108_irq.h> 41 #include <asm/tsi108_pci.h> 42 #include <asm/mpic.h> 43 44 #undef DEBUG 45 46 #define HOLLY_PCI_CFG_PHYS 0x7c000000 47 48 int holly_exclude_device(struct pci_controller *hose, u_char bus, u_char devfn) 49 { 50 if (bus == 0 && PCI_SLOT(devfn) == 0) 51 return PCIBIOS_DEVICE_NOT_FOUND; 52 else 53 return PCIBIOS_SUCCESSFUL; 54 } 55 56 static void holly_remap_bridge(void) 57 { 58 u32 lut_val, lut_addr; 59 int i; 60 61 printk(KERN_INFO "Remapping PCI bridge\n"); 62 63 /* Re-init the PCI bridge and LUT registers to have mappings that don't 64 * rely on PIBS 65 */ 66 lut_addr = 0x900; 67 for (i = 0; i < 31; i++) { 68 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000201); 69 lut_addr += 4; 70 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0); 71 lut_addr += 4; 72 } 73 74 /* Reserve the last LUT entry for PCI I/O space */ 75 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000241); 76 lut_addr += 4; 77 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0); 78 79 /* Map PCI I/O space */ 80 tsi108_write_reg(TSI108_PCI_PFAB_IO_UPPER, 0x0); 81 tsi108_write_reg(TSI108_PCI_PFAB_IO, 0x1); 82 83 /* Map PCI CFG space */ 84 tsi108_write_reg(TSI108_PCI_PFAB_BAR0_UPPER, 0x0); 85 tsi108_write_reg(TSI108_PCI_PFAB_BAR0, 0x7c000000 | 0x01); 86 87 /* We don't need MEM32 and PRM remapping so disable them */ 88 tsi108_write_reg(TSI108_PCI_PFAB_MEM32, 0x0); 89 tsi108_write_reg(TSI108_PCI_PFAB_PFM3, 0x0); 90 tsi108_write_reg(TSI108_PCI_PFAB_PFM4, 0x0); 91 92 /* Set P2O_BAR0 */ 93 tsi108_write_reg(TSI108_PCI_P2O_BAR0_UPPER, 0x0); 94 tsi108_write_reg(TSI108_PCI_P2O_BAR0, 0xc0000000); 95 96 /* Init the PCI LUTs to do no remapping */ 97 lut_addr = 0x500; 98 lut_val = 0x00000002; 99 100 for (i = 0; i < 32; i++) { 101 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, lut_val); 102 lut_addr += 4; 103 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, 0x40000000); 104 lut_addr += 4; 105 lut_val += 0x02000000; 106 } 107 tsi108_write_reg(TSI108_PCI_P2O_PAGE_SIZES, 0x00007900); 108 109 /* Set 64-bit PCI bus address for system memory */ 110 tsi108_write_reg(TSI108_PCI_P2O_BAR2_UPPER, 0x0); 111 tsi108_write_reg(TSI108_PCI_P2O_BAR2, 0x0); 112 } 113 114 static void __init holly_setup_arch(void) 115 { 116 struct device_node *np; 117 118 if (ppc_md.progress) 119 ppc_md.progress("holly_setup_arch():set_bridge", 0); 120 121 tsi108_csr_vir_base = get_vir_csrbase(); 122 123 /* setup PCI host bridge */ 124 holly_remap_bridge(); 125 126 np = of_find_node_by_type(NULL, "pci"); 127 if (np) 128 tsi108_setup_pci(np, HOLLY_PCI_CFG_PHYS, 1); 129 130 ppc_md.pci_exclude_device = holly_exclude_device; 131 if (ppc_md.progress) 132 ppc_md.progress("tsi108: resources set", 0x100); 133 134 printk(KERN_INFO "PPC750GX/CL Platform\n"); 135 } 136 137 /* 138 * Interrupt setup and service. Interrupts on the holly come 139 * from the four external INT pins, PCI interrupts are routed via 140 * PCI interrupt control registers, it generates internal IRQ23 141 * 142 * Interrupt routing on the Holly Board: 143 * TSI108:PB_INT[0] -> CPU0:INT# 144 * TSI108:PB_INT[1] -> CPU0:MCP# 145 * TSI108:PB_INT[2] -> N/C 146 * TSI108:PB_INT[3] -> N/C 147 */ 148 static void __init holly_init_IRQ(void) 149 { 150 struct mpic *mpic; 151 #ifdef CONFIG_PCI 152 unsigned int cascade_pci_irq; 153 struct device_node *tsi_pci; 154 struct device_node *cascade_node = NULL; 155 #endif 156 157 mpic = mpic_alloc(NULL, 0, 158 MPIC_BIG_ENDIAN | MPIC_WANTS_RESET | 159 MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108, 160 24, 161 NR_IRQS-4, /* num_sources used */ 162 "Tsi108_PIC"); 163 164 BUG_ON(mpic == NULL); 165 166 mpic_assign_isu(mpic, 0, mpic->paddr + 0x100); 167 168 mpic_init(mpic); 169 170 #ifdef CONFIG_PCI 171 tsi_pci = of_find_node_by_type(NULL, "pci"); 172 if (tsi_pci == NULL) { 173 printk(KERN_ERR "%s: No tsi108 pci node found !\n", __func__); 174 return; 175 } 176 177 cascade_node = of_find_node_by_type(NULL, "pic-router"); 178 if (cascade_node == NULL) { 179 printk(KERN_ERR "%s: No tsi108 pci cascade node found !\n", __func__); 180 return; 181 } 182 183 cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0); 184 pr_debug("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__, (u32) cascade_pci_irq); 185 tsi108_pci_int_init(cascade_node); 186 irq_set_handler_data(cascade_pci_irq, mpic); 187 irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade); 188 #endif 189 /* Configure MPIC outputs to CPU0 */ 190 tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0); 191 } 192 193 void holly_show_cpuinfo(struct seq_file *m) 194 { 195 seq_printf(m, "vendor\t\t: IBM\n"); 196 seq_printf(m, "machine\t\t: PPC750 GX/CL\n"); 197 } 198 199 void holly_restart(char *cmd) 200 { 201 __be32 __iomem *ocn_bar1 = NULL; 202 unsigned long bar; 203 struct device_node *bridge = NULL; 204 const void *prop; 205 int size; 206 phys_addr_t addr = 0xc0000000; 207 208 local_irq_disable(); 209 210 bridge = of_find_node_by_type(NULL, "tsi-bridge"); 211 if (bridge) { 212 prop = of_get_property(bridge, "reg", &size); 213 addr = of_translate_address(bridge, prop); 214 } 215 addr += (TSI108_PB_OFFSET + 0x414); 216 217 ocn_bar1 = ioremap(addr, 0x4); 218 219 /* Turn on the BOOT bit so the addresses are correctly 220 * routed to the HLP interface */ 221 bar = ioread32be(ocn_bar1); 222 bar |= 2; 223 iowrite32be(bar, ocn_bar1); 224 iosync(); 225 226 /* Set SRR0 to the reset vector and turn on MSR_IP */ 227 mtspr(SPRN_SRR0, 0xfff00100); 228 mtspr(SPRN_SRR1, MSR_IP); 229 230 /* Do an rfi to jump back to firmware. Somewhat evil, 231 * but it works 232 */ 233 __asm__ __volatile__("rfi" : : : "memory"); 234 235 /* Spin until reset happens. Shouldn't really get here */ 236 for (;;) ; 237 } 238 239 void holly_power_off(void) 240 { 241 local_irq_disable(); 242 /* No way to shut power off with software */ 243 for (;;) ; 244 } 245 246 void holly_halt(void) 247 { 248 holly_power_off(); 249 } 250 251 /* 252 * Called very early, device-tree isn't unflattened 253 */ 254 static int __init holly_probe(void) 255 { 256 unsigned long root = of_get_flat_dt_root(); 257 258 if (!of_flat_dt_is_compatible(root, "ibm,holly")) 259 return 0; 260 return 1; 261 } 262 263 static int ppc750_machine_check_exception(struct pt_regs *regs) 264 { 265 const struct exception_table_entry *entry; 266 267 /* Are we prepared to handle this fault */ 268 if ((entry = search_exception_tables(regs->nip)) != NULL) { 269 tsi108_clear_pci_cfg_error(); 270 regs->msr |= MSR_RI; 271 regs->nip = entry->fixup; 272 return 1; 273 } 274 return 0; 275 } 276 277 define_machine(holly){ 278 .name = "PPC750 GX/CL TSI", 279 .probe = holly_probe, 280 .setup_arch = holly_setup_arch, 281 .init_IRQ = holly_init_IRQ, 282 .show_cpuinfo = holly_show_cpuinfo, 283 .get_irq = mpic_get_irq, 284 .restart = holly_restart, 285 .calibrate_decr = generic_calibrate_decr, 286 .machine_check_exception = ppc750_machine_check_exception, 287 .progress = udbg_progress, 288 }; 289