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_platform.h>
26 #include <linux/extable.h>
29 #include <asm/machdep.h>
32 #include <asm/tsi108.h>
33 #include <asm/pci-bridge.h>
35 #include <mm/mmu_decl.h>
36 #include <asm/tsi108_irq.h>
37 #include <asm/tsi108_pci.h>
42 #define HOLLY_PCI_CFG_PHYS 0x7c000000
44 static int holly_exclude_device(struct pci_controller *hose, u_char bus,
47 if (bus == 0 && PCI_SLOT(devfn) == 0)
48 return PCIBIOS_DEVICE_NOT_FOUND;
50 return PCIBIOS_SUCCESSFUL;
53 static void holly_remap_bridge(void)
55 u32 lut_val, lut_addr;
58 printk(KERN_INFO "Remapping PCI bridge\n");
60 /* Re-init the PCI bridge and LUT registers to have mappings that don't
64 for (i = 0; i < 31; i++) {
65 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000201);
67 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
71 /* Reserve the last LUT entry for PCI I/O space */
72 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000241);
74 tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
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);
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);
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);
90 tsi108_write_reg(TSI108_PCI_P2O_BAR0_UPPER, 0x0);
91 tsi108_write_reg(TSI108_PCI_P2O_BAR0, 0xc0000000);
93 /* Init the PCI LUTs to do no remapping */
97 for (i = 0; i < 32; i++) {
98 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, lut_val);
100 tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, 0x40000000);
102 lut_val += 0x02000000;
104 tsi108_write_reg(TSI108_PCI_P2O_PAGE_SIZES, 0x00007900);
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);
111 static void __init holly_init_pci(void)
113 struct device_node *np;
116 ppc_md.progress("holly_setup_arch():set_bridge", 0);
118 /* setup PCI host bridge */
119 holly_remap_bridge();
121 np = of_find_node_by_type(NULL, "pci");
123 tsi108_setup_pci(np, HOLLY_PCI_CFG_PHYS, 1);
125 ppc_md.pci_exclude_device = holly_exclude_device;
127 ppc_md.progress("tsi108: resources set", 0x100);
130 static void __init holly_setup_arch(void)
132 tsi108_csr_vir_base = get_vir_csrbase();
134 printk(KERN_INFO "PPC750GX/CL Platform\n");
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
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
148 static void __init holly_init_IRQ(void)
152 unsigned int cascade_pci_irq;
153 struct device_node *tsi_pci;
154 struct device_node *cascade_node = NULL;
157 mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
158 MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
162 BUG_ON(mpic == NULL);
164 mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
169 tsi_pci = of_find_node_by_type(NULL, "pci");
170 if (tsi_pci == NULL) {
171 printk(KERN_ERR "%s: No tsi108 pci node found !\n", __func__);
175 cascade_node = of_find_node_by_type(NULL, "pic-router");
176 if (cascade_node == NULL) {
177 printk(KERN_ERR "%s: No tsi108 pci cascade node found !\n", __func__);
181 cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
182 pr_debug("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__, (u32) cascade_pci_irq);
183 tsi108_pci_int_init(cascade_node);
184 irq_set_handler_data(cascade_pci_irq, mpic);
185 irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
187 /* Configure MPIC outputs to CPU0 */
188 tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
191 static void holly_show_cpuinfo(struct seq_file *m)
193 seq_printf(m, "vendor\t\t: IBM\n");
194 seq_printf(m, "machine\t\t: PPC750 GX/CL\n");
197 static void __noreturn holly_restart(char *cmd)
199 __be32 __iomem *ocn_bar1 = NULL;
201 struct device_node *bridge = NULL;
204 phys_addr_t addr = 0xc0000000;
208 bridge = of_find_node_by_type(NULL, "tsi-bridge");
210 prop = of_get_property(bridge, "reg", &size);
211 addr = of_translate_address(bridge, prop);
213 addr += (TSI108_PB_OFFSET + 0x414);
215 ocn_bar1 = ioremap(addr, 0x4);
217 /* Turn on the BOOT bit so the addresses are correctly
218 * routed to the HLP interface */
219 bar = ioread32be(ocn_bar1);
221 iowrite32be(bar, ocn_bar1);
224 /* Set SRR0 to the reset vector and turn on MSR_IP */
225 mtspr(SPRN_SRR0, 0xfff00100);
226 mtspr(SPRN_SRR1, MSR_IP);
228 /* Do an rfi to jump back to firmware. Somewhat evil,
231 __asm__ __volatile__("rfi" : : : "memory");
233 /* Spin until reset happens. Shouldn't really get here */
238 * Called very early, device-tree isn't unflattened
240 static int __init holly_probe(void)
242 if (!of_machine_is_compatible("ibm,holly"))
247 static int ppc750_machine_check_exception(struct pt_regs *regs)
249 const struct exception_table_entry *entry;
251 /* Are we prepared to handle this fault */
252 if ((entry = search_exception_tables(regs->nip)) != NULL) {
253 tsi108_clear_pci_cfg_error();
254 regs_set_return_msr(regs, regs->msr | MSR_RI);
255 regs_set_return_ip(regs, extable_fixup(entry));
261 define_machine(holly){
262 .name = "PPC750 GX/CL TSI",
263 .probe = holly_probe,
264 .setup_arch = holly_setup_arch,
265 .discover_phbs = holly_init_pci,
266 .init_IRQ = holly_init_IRQ,
267 .show_cpuinfo = holly_show_cpuinfo,
268 .get_irq = mpic_get_irq,
269 .restart = holly_restart,
270 .calibrate_decr = generic_calibrate_decr,
271 .machine_check_exception = ppc750_machine_check_exception,
272 .progress = udbg_progress,