1 // SPDX-License-Identifier: GPL-2.0-only
3 * Board setup routines for the IBM 750GX/CL platform w/ TSI10x bridge
5 * Copyright 2007 IBM Corporation
7 * Stephen Winiecki <stevewin@us.ibm.com>
8 * Josh Boyer <jwboyer@linux.vnet.ibm.com>
10 * Based on code from mpc7448_hpc2.c
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_address.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_platform.h>
28 #include <linux/extable.h>
31 #include <asm/machdep.h>
33 #include <asm/tsi108.h>
34 #include <asm/pci-bridge.h>
36 #include <mm/mmu_decl.h>
37 #include <asm/tsi108_irq.h>
38 #include <asm/tsi108_pci.h>
43 #define HOLLY_PCI_CFG_PHYS 0x7c000000
45 static int holly_exclude_device(struct pci_controller *hose, u_char bus,
48 if (bus == 0 && PCI_SLOT(devfn) == 0)
49 return PCIBIOS_DEVICE_NOT_FOUND;
51 return PCIBIOS_SUCCESSFUL;
54 static void __init holly_remap_bridge(void)
56 u32 lut_val, lut_addr;
59 printk(KERN_INFO "Remapping PCI bridge\n");
61 /* Re-init the PCI bridge and LUT registers to have mappings that don't
65 for (i = 0; i < 31; i++) {
66 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000201);
68 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
72 /* Reserve the last LUT entry for PCI I/O space */
73 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000241);
75 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
77 /* Map PCI I/O space */
78 tsi108_write_reg(TSI108_PCI_PFAB_IO_UPPER, 0x0);
79 tsi108_write_reg(TSI108_PCI_PFAB_IO, 0x1);
81 /* Map PCI CFG space */
82 tsi108_write_reg(TSI108_PCI_PFAB_BAR0_UPPER, 0x0);
83 tsi108_write_reg(TSI108_PCI_PFAB_BAR0, 0x7c000000 | 0x01);
85 /* We don't need MEM32 and PRM remapping so disable them */
86 tsi108_write_reg(TSI108_PCI_PFAB_MEM32, 0x0);
87 tsi108_write_reg(TSI108_PCI_PFAB_PFM3, 0x0);
88 tsi108_write_reg(TSI108_PCI_PFAB_PFM4, 0x0);
91 tsi108_write_reg(TSI108_PCI_P2O_BAR0_UPPER, 0x0);
92 tsi108_write_reg(TSI108_PCI_P2O_BAR0, 0xc0000000);
94 /* Init the PCI LUTs to do no remapping */
98 for (i = 0; i < 32; i++) {
99 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, lut_val);
101 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, 0x40000000);
103 lut_val += 0x02000000;
105 tsi108_write_reg(TSI108_PCI_P2O_PAGE_SIZES, 0x00007900);
107 /* Set 64-bit PCI bus address for system memory */
108 tsi108_write_reg(TSI108_PCI_P2O_BAR2_UPPER, 0x0);
109 tsi108_write_reg(TSI108_PCI_P2O_BAR2, 0x0);
112 static void __init holly_init_pci(void)
114 struct device_node *np;
117 ppc_md.progress("holly_setup_arch():set_bridge", 0);
119 /* setup PCI host bridge */
120 holly_remap_bridge();
122 np = of_find_node_by_type(NULL, "pci");
124 tsi108_setup_pci(np, HOLLY_PCI_CFG_PHYS, 1);
126 ppc_md.pci_exclude_device = holly_exclude_device;
128 ppc_md.progress("tsi108: resources set", 0x100);
131 static void __init holly_setup_arch(void)
133 tsi108_csr_vir_base = get_vir_csrbase();
135 printk(KERN_INFO "PPC750GX/CL Platform\n");
139 * Interrupt setup and service. Interrupts on the holly come
140 * from the four external INT pins, PCI interrupts are routed via
141 * PCI interrupt control registers, it generates internal IRQ23
143 * Interrupt routing on the Holly Board:
144 * TSI108:PB_INT[0] -> CPU0:INT#
145 * TSI108:PB_INT[1] -> CPU0:MCP#
146 * TSI108:PB_INT[2] -> N/C
147 * TSI108:PB_INT[3] -> N/C
149 static void __init holly_init_IRQ(void)
153 unsigned int cascade_pci_irq;
154 struct device_node *tsi_pci;
155 struct device_node *cascade_node = NULL;
158 mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
159 MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
163 BUG_ON(mpic == NULL);
165 mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
170 tsi_pci = of_find_node_by_type(NULL, "pci");
171 if (tsi_pci == NULL) {
172 printk(KERN_ERR "%s: No tsi108 pci node found !\n", __func__);
176 cascade_node = of_find_node_by_type(NULL, "pic-router");
177 if (cascade_node == NULL) {
178 printk(KERN_ERR "%s: No tsi108 pci cascade node found !\n", __func__);
182 cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
183 pr_debug("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__, (u32) cascade_pci_irq);
184 tsi108_pci_int_init(cascade_node);
185 irq_set_handler_data(cascade_pci_irq, mpic);
186 irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
188 /* Configure MPIC outputs to CPU0 */
189 tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
192 static void holly_show_cpuinfo(struct seq_file *m)
194 seq_printf(m, "vendor\t\t: IBM\n");
195 seq_printf(m, "machine\t\t: PPC750 GX/CL\n");
198 static void __noreturn holly_restart(char *cmd)
200 __be32 __iomem *ocn_bar1 = NULL;
202 struct device_node *bridge = NULL;
205 phys_addr_t addr = 0xc0000000;
209 bridge = of_find_node_by_type(NULL, "tsi-bridge");
211 prop = of_get_property(bridge, "reg", &size);
212 addr = of_translate_address(bridge, prop);
214 addr += (TSI108_PB_OFFSET + 0x414);
216 ocn_bar1 = ioremap(addr, 0x4);
218 /* Turn on the BOOT bit so the addresses are correctly
219 * routed to the HLP interface */
220 bar = ioread32be(ocn_bar1);
222 iowrite32be(bar, ocn_bar1);
225 /* Set SRR0 to the reset vector and turn on MSR_IP */
226 mtspr(SPRN_SRR0, 0xfff00100);
227 mtspr(SPRN_SRR1, MSR_IP);
229 /* Do an rfi to jump back to firmware. Somewhat evil,
232 __asm__ __volatile__("rfi" : : : "memory");
234 /* Spin until reset happens. Shouldn't really get here */
239 * Called very early, device-tree isn't unflattened
241 static int __init holly_probe(void)
243 if (!of_machine_is_compatible("ibm,holly"))
248 static int ppc750_machine_check_exception(struct pt_regs *regs)
250 const struct exception_table_entry *entry;
252 /* Are we prepared to handle this fault */
253 if ((entry = search_exception_tables(regs->nip)) != NULL) {
254 tsi108_clear_pci_cfg_error();
255 regs_set_recoverable(regs);
256 regs_set_return_ip(regs, extable_fixup(entry));
262 define_machine(holly){
263 .name = "PPC750 GX/CL TSI",
264 .probe = holly_probe,
265 .setup_arch = holly_setup_arch,
266 .discover_phbs = holly_init_pci,
267 .init_IRQ = holly_init_IRQ,
268 .show_cpuinfo = holly_show_cpuinfo,
269 .get_irq = mpic_get_irq,
270 .restart = holly_restart,
271 .calibrate_decr = generic_calibrate_decr,
272 .machine_check_exception = ppc750_machine_check_exception,
273 .progress = udbg_progress,