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_address.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_platform.h>
28 #include <linux/extable.h>
29 
30 #include <asm/time.h>
31 #include <asm/machdep.h>
32 #include <asm/udbg.h>
33 #include <asm/tsi108.h>
34 #include <asm/pci-bridge.h>
35 #include <asm/reg.h>
36 #include <mm/mmu_decl.h>
37 #include <asm/tsi108_irq.h>
38 #include <asm/tsi108_pci.h>
39 #include <asm/mpic.h>
40 
41 #undef DEBUG
42 
43 #define HOLLY_PCI_CFG_PHYS 0x7c000000
44 
45 static int holly_exclude_device(struct pci_controller *hose, u_char bus,
46 				u_char devfn)
47 {
48 	if (bus == 0 && PCI_SLOT(devfn) == 0)
49 		return PCIBIOS_DEVICE_NOT_FOUND;
50 	else
51 		return PCIBIOS_SUCCESSFUL;
52 }
53 
54 static void __init holly_remap_bridge(void)
55 {
56 	u32 lut_val, lut_addr;
57 	int i;
58 
59 	printk(KERN_INFO "Remapping PCI bridge\n");
60 
61 	/* Re-init the PCI bridge and LUT registers to have mappings that don't
62 	 * rely on PIBS
63 	 */
64 	lut_addr = 0x900;
65 	for (i = 0; i < 31; i++) {
66 		tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000201);
67 		lut_addr += 4;
68 		tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
69 		lut_addr += 4;
70 	}
71 
72 	/* Reserve the last LUT entry for PCI I/O space */
73 	tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000241);
74 	lut_addr += 4;
75 	tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
76 
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);
80 
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);
84 
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);
89 
90 	/* Set P2O_BAR0 */
91 	tsi108_write_reg(TSI108_PCI_P2O_BAR0_UPPER, 0x0);
92 	tsi108_write_reg(TSI108_PCI_P2O_BAR0, 0xc0000000);
93 
94 	/* Init the PCI LUTs to do no remapping */
95 	lut_addr = 0x500;
96 	lut_val = 0x00000002;
97 
98 	for (i = 0; i < 32; i++) {
99 		tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, lut_val);
100 		lut_addr += 4;
101 		tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, 0x40000000);
102 		lut_addr += 4;
103 		lut_val += 0x02000000;
104 	}
105 	tsi108_write_reg(TSI108_PCI_P2O_PAGE_SIZES, 0x00007900);
106 
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);
110 }
111 
112 static void __init holly_init_pci(void)
113 {
114 	struct device_node *np;
115 
116 	if (ppc_md.progress)
117 		ppc_md.progress("holly_setup_arch():set_bridge", 0);
118 
119 	/* setup PCI host bridge */
120 	holly_remap_bridge();
121 
122 	np = of_find_node_by_type(NULL, "pci");
123 	if (np)
124 		tsi108_setup_pci(np, HOLLY_PCI_CFG_PHYS, 1);
125 
126 	of_node_put(np);
127 
128 	ppc_md.pci_exclude_device = holly_exclude_device;
129 	if (ppc_md.progress)
130 		ppc_md.progress("tsi108: resources set", 0x100);
131 }
132 
133 static void __init holly_setup_arch(void)
134 {
135 	tsi108_csr_vir_base = get_vir_csrbase();
136 
137 	printk(KERN_INFO "PPC750GX/CL Platform\n");
138 }
139 
140 /*
141  * Interrupt setup and service.  Interrupts on the holly come
142  * from the four external INT pins, PCI interrupts are routed via
143  * PCI interrupt control registers, it generates internal IRQ23
144  *
145  * Interrupt routing on the Holly Board:
146  * TSI108:PB_INT[0] -> CPU0:INT#
147  * TSI108:PB_INT[1] -> CPU0:MCP#
148  * TSI108:PB_INT[2] -> N/C
149  * TSI108:PB_INT[3] -> N/C
150  */
151 static void __init holly_init_IRQ(void)
152 {
153 	struct mpic *mpic;
154 #ifdef CONFIG_PCI
155 	unsigned int cascade_pci_irq;
156 	struct device_node *tsi_pci;
157 	struct device_node *cascade_node = NULL;
158 #endif
159 
160 	mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
161 			MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
162 			24, 0,
163 			"Tsi108_PIC");
164 
165 	BUG_ON(mpic == NULL);
166 
167 	mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
168 
169 	mpic_init(mpic);
170 
171 #ifdef CONFIG_PCI
172 	tsi_pci = of_find_node_by_type(NULL, "pci");
173 	if (tsi_pci == NULL) {
174 		printk(KERN_ERR "%s: No tsi108 pci node found !\n", __func__);
175 		return;
176 	}
177 
178 	cascade_node = of_find_node_by_type(NULL, "pic-router");
179 	if (cascade_node == NULL) {
180 		printk(KERN_ERR "%s: No tsi108 pci cascade node found !\n", __func__);
181 		return;
182 	}
183 
184 	cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
185 	pr_debug("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__, (u32) cascade_pci_irq);
186 	tsi108_pci_int_init(cascade_node);
187 	irq_set_handler_data(cascade_pci_irq, mpic);
188 	irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
189 
190 	of_node_put(tsi_pci);
191 	of_node_put(cascade_node);
192 #endif
193 	/* Configure MPIC outputs to CPU0 */
194 	tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
195 }
196 
197 static void holly_show_cpuinfo(struct seq_file *m)
198 {
199 	seq_printf(m, "vendor\t\t: IBM\n");
200 	seq_printf(m, "machine\t\t: PPC750 GX/CL\n");
201 }
202 
203 static void __noreturn holly_restart(char *cmd)
204 {
205 	__be32 __iomem *ocn_bar1 = NULL;
206 	unsigned long bar;
207 	struct device_node *bridge = NULL;
208 	const void *prop;
209 	int size;
210 	phys_addr_t addr = 0xc0000000;
211 
212 	local_irq_disable();
213 
214 	bridge = of_find_node_by_type(NULL, "tsi-bridge");
215 	if (bridge) {
216 		prop = of_get_property(bridge, "reg", &size);
217 		addr = of_translate_address(bridge, prop);
218 		of_node_put(bridge);
219 	}
220 	addr += (TSI108_PB_OFFSET + 0x414);
221 
222 	ocn_bar1 = ioremap(addr, 0x4);
223 
224 	/* Turn on the BOOT bit so the addresses are correctly
225 	 * routed to the HLP interface */
226 	bar = ioread32be(ocn_bar1);
227 	bar |= 2;
228 	iowrite32be(bar, ocn_bar1);
229 	iosync();
230 
231 	/* Set SRR0 to the reset vector and turn on MSR_IP */
232 	mtspr(SPRN_SRR0, 0xfff00100);
233 	mtspr(SPRN_SRR1, MSR_IP);
234 
235 	/* Do an rfi to jump back to firmware.  Somewhat evil,
236 	 * but it works
237 	 */
238 	__asm__ __volatile__("rfi" : : : "memory");
239 
240 	/* Spin until reset happens.  Shouldn't really get here */
241 	for (;;) ;
242 }
243 
244 /*
245  * Called very early, device-tree isn't unflattened
246  */
247 static int __init holly_probe(void)
248 {
249 	if (!of_machine_is_compatible("ibm,holly"))
250 		return 0;
251 	return 1;
252 }
253 
254 static int ppc750_machine_check_exception(struct pt_regs *regs)
255 {
256 	const struct exception_table_entry *entry;
257 
258 	/* Are we prepared to handle this fault */
259 	if ((entry = search_exception_tables(regs->nip)) != NULL) {
260 		tsi108_clear_pci_cfg_error();
261 		regs_set_recoverable(regs);
262 		regs_set_return_ip(regs, extable_fixup(entry));
263 		return 1;
264 	}
265 	return 0;
266 }
267 
268 define_machine(holly){
269 	.name                   	= "PPC750 GX/CL TSI",
270 	.probe                  	= holly_probe,
271 	.setup_arch             	= holly_setup_arch,
272 	.discover_phbs			= holly_init_pci,
273 	.init_IRQ               	= holly_init_IRQ,
274 	.show_cpuinfo           	= holly_show_cpuinfo,
275 	.get_irq                	= mpic_get_irq,
276 	.restart                	= holly_restart,
277 	.calibrate_decr         	= generic_calibrate_decr,
278 	.machine_check_exception	= ppc750_machine_check_exception,
279 	.progress               	= udbg_progress,
280 };
281