1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Maple (970 eval board) setup code
4  *
5  *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
6  *                     IBM Corp.
7  */
8 
9 #undef DEBUG
10 
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/export.h>
16 #include <linux/mm.h>
17 #include <linux/stddef.h>
18 #include <linux/unistd.h>
19 #include <linux/ptrace.h>
20 #include <linux/user.h>
21 #include <linux/tty.h>
22 #include <linux/string.h>
23 #include <linux/delay.h>
24 #include <linux/ioport.h>
25 #include <linux/major.h>
26 #include <linux/initrd.h>
27 #include <linux/vt_kern.h>
28 #include <linux/console.h>
29 #include <linux/pci.h>
30 #include <linux/adb.h>
31 #include <linux/cuda.h>
32 #include <linux/pmu.h>
33 #include <linux/irq.h>
34 #include <linux/seq_file.h>
35 #include <linux/root_dev.h>
36 #include <linux/serial.h>
37 #include <linux/smp.h>
38 #include <linux/bitops.h>
39 #include <linux/of.h>
40 #include <linux/of_address.h>
41 #include <linux/platform_device.h>
42 #include <linux/memblock.h>
43 
44 #include <asm/processor.h>
45 #include <asm/sections.h>
46 #include <asm/io.h>
47 #include <asm/pci-bridge.h>
48 #include <asm/iommu.h>
49 #include <asm/machdep.h>
50 #include <asm/dma.h>
51 #include <asm/cputable.h>
52 #include <asm/time.h>
53 #include <asm/mpic.h>
54 #include <asm/rtas.h>
55 #include <asm/udbg.h>
56 #include <asm/nvram.h>
57 
58 #include "maple.h"
59 
60 #ifdef DEBUG
61 #define DBG(fmt...) udbg_printf(fmt)
62 #else
63 #define DBG(fmt...)
64 #endif
65 
66 static unsigned long maple_find_nvram_base(void)
67 {
68 	struct device_node *rtcs;
69 	unsigned long result = 0;
70 
71 	/* find NVRAM device */
72 	rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
73 	if (rtcs) {
74 		struct resource r;
75 		if (of_address_to_resource(rtcs, 0, &r)) {
76 			printk(KERN_EMERG "Maple: Unable to translate NVRAM"
77 			       " address\n");
78 			goto bail;
79 		}
80 		if (!(r.flags & IORESOURCE_IO)) {
81 			printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
82 			goto bail;
83 		}
84 		result = r.start;
85 	} else
86 		printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
87  bail:
88 	of_node_put(rtcs);
89 	return result;
90 }
91 
92 static void __noreturn maple_restart(char *cmd)
93 {
94 	unsigned int maple_nvram_base;
95 	const unsigned int *maple_nvram_offset, *maple_nvram_command;
96 	struct device_node *sp;
97 
98 	maple_nvram_base = maple_find_nvram_base();
99 	if (maple_nvram_base == 0)
100 		goto fail;
101 
102 	/* find service processor device */
103 	sp = of_find_node_by_name(NULL, "service-processor");
104 	if (!sp) {
105 		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
106 		goto fail;
107 	}
108 	maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
109 	maple_nvram_command = of_get_property(sp, "restart-value", NULL);
110 	of_node_put(sp);
111 
112 	/* send command */
113 	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
114 	for (;;) ;
115  fail:
116 	printk(KERN_EMERG "Maple: Manual Restart Required\n");
117 	for (;;) ;
118 }
119 
120 static void __noreturn maple_power_off(void)
121 {
122 	unsigned int maple_nvram_base;
123 	const unsigned int *maple_nvram_offset, *maple_nvram_command;
124 	struct device_node *sp;
125 
126 	maple_nvram_base = maple_find_nvram_base();
127 	if (maple_nvram_base == 0)
128 		goto fail;
129 
130 	/* find service processor device */
131 	sp = of_find_node_by_name(NULL, "service-processor");
132 	if (!sp) {
133 		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
134 		goto fail;
135 	}
136 	maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
137 	maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
138 	of_node_put(sp);
139 
140 	/* send command */
141 	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
142 	for (;;) ;
143  fail:
144 	printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
145 	for (;;) ;
146 }
147 
148 static void __noreturn maple_halt(void)
149 {
150 	maple_power_off();
151 }
152 
153 #ifdef CONFIG_SMP
154 static struct smp_ops_t maple_smp_ops = {
155 	.probe		= smp_mpic_probe,
156 	.message_pass	= smp_mpic_message_pass,
157 	.kick_cpu	= smp_generic_kick_cpu,
158 	.setup_cpu	= smp_mpic_setup_cpu,
159 	.give_timebase	= smp_generic_give_timebase,
160 	.take_timebase	= smp_generic_take_timebase,
161 };
162 #endif /* CONFIG_SMP */
163 
164 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
165 {
166 	if (rtas_function_implemented(RTAS_FN_SYSTEM_REBOOT) &&
167 	    rtas_function_implemented(RTAS_FN_POWER_OFF)) {
168 		ppc_md.restart = rtas_restart;
169 		pm_power_off = rtas_power_off;
170 		ppc_md.halt = rtas_halt;
171 	}
172 }
173 
174 static void __init maple_setup_arch(void)
175 {
176 	/* init to some ~sane value until calibrate_delay() runs */
177 	loops_per_jiffy = 50000000;
178 
179 	/* Setup SMP callback */
180 #ifdef CONFIG_SMP
181 	smp_ops = &maple_smp_ops;
182 #endif
183 	maple_use_rtas_reboot_and_halt_if_present();
184 
185 	printk(KERN_DEBUG "Using native/NAP idle loop\n");
186 
187 	mmio_nvram_init();
188 }
189 
190 /*
191  * This is almost identical to pSeries and CHRP. We need to make that
192  * code generic at one point, with appropriate bits in the device-tree to
193  * identify the presence of an HT APIC
194  */
195 static void __init maple_init_IRQ(void)
196 {
197 	struct device_node *root, *np, *mpic_node = NULL;
198 	const unsigned int *opprop;
199 	unsigned long openpic_addr = 0;
200 	int naddr, n, i, opplen, has_isus = 0;
201 	struct mpic *mpic;
202 	unsigned int flags = 0;
203 
204 	/* Locate MPIC in the device-tree. Note that there is a bug
205 	 * in Maple device-tree where the type of the controller is
206 	 * open-pic and not interrupt-controller
207 	 */
208 
209 	for_each_node_by_type(np, "interrupt-controller")
210 		if (of_device_is_compatible(np, "open-pic")) {
211 			mpic_node = np;
212 			break;
213 		}
214 	if (mpic_node == NULL)
215 		for_each_node_by_type(np, "open-pic") {
216 			mpic_node = np;
217 			break;
218 		}
219 	if (mpic_node == NULL) {
220 		printk(KERN_ERR
221 		       "Failed to locate the MPIC interrupt controller\n");
222 		return;
223 	}
224 
225 	/* Find address list in /platform-open-pic */
226 	root = of_find_node_by_path("/");
227 	naddr = of_n_addr_cells(root);
228 	opprop = of_get_property(root, "platform-open-pic", &opplen);
229 	if (opprop) {
230 		openpic_addr = of_read_number(opprop, naddr);
231 		has_isus = (opplen > naddr);
232 		printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
233 		       openpic_addr, has_isus);
234 	}
235 
236 	BUG_ON(openpic_addr == 0);
237 
238 	/* Check for a big endian MPIC */
239 	if (of_property_read_bool(np, "big-endian"))
240 		flags |= MPIC_BIG_ENDIAN;
241 
242 	/* XXX Maple specific bits */
243 	flags |= MPIC_U3_HT_IRQS;
244 	/* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
245 	flags |= MPIC_BIG_ENDIAN;
246 
247 	/* Setup the openpic driver. More device-tree junks, we hard code no
248 	 * ISUs for now. I'll have to revisit some stuffs with the folks doing
249 	 * the firmware for those
250 	 */
251 	mpic = mpic_alloc(mpic_node, openpic_addr, flags,
252 			  /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
253 	BUG_ON(mpic == NULL);
254 
255 	/* Add ISUs */
256 	opplen /= sizeof(u32);
257 	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
258 		unsigned long isuaddr = of_read_number(opprop + i, naddr);
259 		mpic_assign_isu(mpic, n, isuaddr);
260 	}
261 
262 	/* All ISUs are setup, complete initialization */
263 	mpic_init(mpic);
264 	ppc_md.get_irq = mpic_get_irq;
265 	of_node_put(mpic_node);
266 	of_node_put(root);
267 }
268 
269 static void __init maple_progress(char *s, unsigned short hex)
270 {
271 	printk("*** %04x : %s\n", hex, s ? s : "");
272 }
273 
274 
275 /*
276  * Called very early, MMU is off, device-tree isn't unflattened
277  */
278 static int __init maple_probe(void)
279 {
280 	if (!of_machine_is_compatible("Momentum,Maple") &&
281 	    !of_machine_is_compatible("Momentum,Apache"))
282 		return 0;
283 
284 	pm_power_off = maple_power_off;
285 
286 	iommu_init_early_dart(&maple_pci_controller_ops);
287 
288 	return 1;
289 }
290 
291 #ifdef CONFIG_EDAC
292 /*
293  * Register a platform device for CPC925 memory controller on
294  * all boards with U3H (CPC925) bridge.
295  */
296 static int __init maple_cpc925_edac_setup(void)
297 {
298 	struct platform_device *pdev;
299 	struct device_node *np = NULL;
300 	struct resource r;
301 	int ret;
302 	volatile void __iomem *mem;
303 	u32 rev;
304 
305 	np = of_find_node_by_type(NULL, "memory-controller");
306 	if (!np) {
307 		printk(KERN_ERR "%s: Unable to find memory-controller node\n",
308 			__func__);
309 		return -ENODEV;
310 	}
311 
312 	ret = of_address_to_resource(np, 0, &r);
313 	of_node_put(np);
314 
315 	if (ret < 0) {
316 		printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
317 			__func__);
318 		return -ENODEV;
319 	}
320 
321 	mem = ioremap(r.start, resource_size(&r));
322 	if (!mem) {
323 		printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
324 				__func__);
325 		return -ENOMEM;
326 	}
327 
328 	rev = __raw_readl(mem);
329 	iounmap(mem);
330 
331 	if (rev < 0x34 || rev > 0x3f) { /* U3H */
332 		printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
333 			__func__, rev);
334 		return 0;
335 	}
336 
337 	pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
338 	if (IS_ERR(pdev))
339 		return PTR_ERR(pdev);
340 
341 	printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
342 
343 	return 0;
344 }
345 machine_device_initcall(maple, maple_cpc925_edac_setup);
346 #endif
347 
348 define_machine(maple) {
349 	.name			= "Maple",
350 	.probe			= maple_probe,
351 	.setup_arch		= maple_setup_arch,
352 	.discover_phbs		= maple_pci_init,
353 	.init_IRQ		= maple_init_IRQ,
354 	.pci_irq_fixup		= maple_pci_irq_fixup,
355 	.pci_get_legacy_ide_irq	= maple_pci_get_legacy_ide_irq,
356 	.restart		= maple_restart,
357 	.halt			= maple_halt,
358 	.get_boot_time		= maple_get_boot_time,
359 	.set_rtc_time		= maple_set_rtc_time,
360 	.get_rtc_time		= maple_get_rtc_time,
361 	.progress		= maple_progress,
362 	.power_save		= power4_idle,
363 };
364