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