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_device.h>
40#include <linux/memblock.h>
41
42#include <asm/processor.h>
43#include <asm/sections.h>
44#include <asm/prom.h>
45#include <asm/io.h>
46#include <asm/pci-bridge.h>
47#include <asm/iommu.h>
48#include <asm/machdep.h>
49#include <asm/dma.h>
50#include <asm/cputable.h>
51#include <asm/time.h>
52#include <asm/mpic.h>
53#include <asm/rtas.h>
54#include <asm/udbg.h>
55#include <asm/nvram.h>
56
57#include "maple.h"
58
59#ifdef DEBUG
60#define DBG(fmt...) udbg_printf(fmt)
61#else
62#define DBG(fmt...)
63#endif
64
65static unsigned long maple_find_nvram_base(void)
66{
67	struct device_node *rtcs;
68	unsigned long result = 0;
69
70	/* find NVRAM device */
71	rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
72	if (rtcs) {
73		struct resource r;
74		if (of_address_to_resource(rtcs, 0, &r)) {
75			printk(KERN_EMERG "Maple: Unable to translate NVRAM"
76			       " address\n");
77			goto bail;
78		}
79		if (!(r.flags & IORESOURCE_IO)) {
80			printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
81			goto bail;
82		}
83		result = r.start;
84	} else
85		printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
86 bail:
87	of_node_put(rtcs);
88	return result;
89}
90
91static void __noreturn maple_restart(char *cmd)
92{
93	unsigned int maple_nvram_base;
94	const unsigned int *maple_nvram_offset, *maple_nvram_command;
95	struct device_node *sp;
96
97	maple_nvram_base = maple_find_nvram_base();
98	if (maple_nvram_base == 0)
99		goto fail;
100
101	/* find service processor device */
102	sp = of_find_node_by_name(NULL, "service-processor");
103	if (!sp) {
104		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
105		goto fail;
106	}
107	maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
108	maple_nvram_command = of_get_property(sp, "restart-value", NULL);
109	of_node_put(sp);
110
111	/* send command */
112	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
113	for (;;) ;
114 fail:
115	printk(KERN_EMERG "Maple: Manual Restart Required\n");
116	for (;;) ;
117}
118
119static void __noreturn maple_power_off(void)
120{
121	unsigned int maple_nvram_base;
122	const unsigned int *maple_nvram_offset, *maple_nvram_command;
123	struct device_node *sp;
124
125	maple_nvram_base = maple_find_nvram_base();
126	if (maple_nvram_base == 0)
127		goto fail;
128
129	/* find service processor device */
130	sp = of_find_node_by_name(NULL, "service-processor");
131	if (!sp) {
132		printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
133		goto fail;
134	}
135	maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
136	maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
137	of_node_put(sp);
138
139	/* send command */
140	outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
141	for (;;) ;
142 fail:
143	printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
144	for (;;) ;
145}
146
147static void __noreturn maple_halt(void)
148{
149	maple_power_off();
150}
151
152#ifdef CONFIG_SMP
153static struct smp_ops_t maple_smp_ops = {
154	.probe		= smp_mpic_probe,
155	.message_pass	= smp_mpic_message_pass,
156	.kick_cpu	= smp_generic_kick_cpu,
157	.setup_cpu	= smp_mpic_setup_cpu,
158	.give_timebase	= smp_generic_give_timebase,
159	.take_timebase	= smp_generic_take_timebase,
160};
161#endif /* CONFIG_SMP */
162
163static void __init maple_use_rtas_reboot_and_halt_if_present(void)
164{
165	if (rtas_service_present("system-reboot") &&
166	    rtas_service_present("power-off")) {
167		ppc_md.restart = rtas_restart;
168		pm_power_off = rtas_power_off;
169		ppc_md.halt = rtas_halt;
170	}
171}
172
173static void __init maple_setup_arch(void)
174{
175	/* init to some ~sane value until calibrate_delay() runs */
176	loops_per_jiffy = 50000000;
177
178	/* Setup SMP callback */
179#ifdef CONFIG_SMP
180	smp_ops = &maple_smp_ops;
181#endif
182	/* Lookup PCI hosts */
183       	maple_pci_init();
184
185	maple_use_rtas_reboot_and_halt_if_present();
186
187	printk(KERN_DEBUG "Using native/NAP idle loop\n");
188
189	mmio_nvram_init();
190}
191
192/*
193 * This is almost identical to pSeries and CHRP. We need to make that
194 * code generic at one point, with appropriate bits in the device-tree to
195 * identify the presence of an HT APIC
196 */
197static void __init maple_init_IRQ(void)
198{
199	struct device_node *root, *np, *mpic_node = NULL;
200	const unsigned int *opprop;
201	unsigned long openpic_addr = 0;
202	int naddr, n, i, opplen, has_isus = 0;
203	struct mpic *mpic;
204	unsigned int flags = 0;
205
206	/* Locate MPIC in the device-tree. Note that there is a bug
207	 * in Maple device-tree where the type of the controller is
208	 * open-pic and not interrupt-controller
209	 */
210
211	for_each_node_by_type(np, "interrupt-controller")
212		if (of_device_is_compatible(np, "open-pic")) {
213			mpic_node = np;
214			break;
215		}
216	if (mpic_node == NULL)
217		for_each_node_by_type(np, "open-pic") {
218			mpic_node = np;
219			break;
220		}
221	if (mpic_node == NULL) {
222		printk(KERN_ERR
223		       "Failed to locate the MPIC interrupt controller\n");
224		return;
225	}
226
227	/* Find address list in /platform-open-pic */
228	root = of_find_node_by_path("/");
229	naddr = of_n_addr_cells(root);
230	opprop = of_get_property(root, "platform-open-pic", &opplen);
231	if (opprop) {
232		openpic_addr = of_read_number(opprop, naddr);
233		has_isus = (opplen > naddr);
234		printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
235		       openpic_addr, has_isus);
236	}
237
238	BUG_ON(openpic_addr == 0);
239
240	/* Check for a big endian MPIC */
241	if (of_get_property(np, "big-endian", NULL) != NULL)
242		flags |= MPIC_BIG_ENDIAN;
243
244	/* XXX Maple specific bits */
245	flags |= MPIC_U3_HT_IRQS;
246	/* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
247	flags |= MPIC_BIG_ENDIAN;
248
249	/* Setup the openpic driver. More device-tree junks, we hard code no
250	 * ISUs for now. I'll have to revisit some stuffs with the folks doing
251	 * the firmware for those
252	 */
253	mpic = mpic_alloc(mpic_node, openpic_addr, flags,
254			  /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
255	BUG_ON(mpic == NULL);
256
257	/* Add ISUs */
258	opplen /= sizeof(u32);
259	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
260		unsigned long isuaddr = of_read_number(opprop + i, naddr);
261		mpic_assign_isu(mpic, n, isuaddr);
262	}
263
264	/* All ISUs are setup, complete initialization */
265	mpic_init(mpic);
266	ppc_md.get_irq = mpic_get_irq;
267	of_node_put(mpic_node);
268	of_node_put(root);
269}
270
271static void __init maple_progress(char *s, unsigned short hex)
272{
273	printk("*** %04x : %s\n", hex, s ? s : "");
274}
275
276
277/*
278 * Called very early, MMU is off, device-tree isn't unflattened
279 */
280static int __init maple_probe(void)
281{
282	if (!of_machine_is_compatible("Momentum,Maple") &&
283	    !of_machine_is_compatible("Momentum,Apache"))
284		return 0;
285
286	pm_power_off = maple_power_off;
287
288	iommu_init_early_dart(&maple_pci_controller_ops);
289
290	return 1;
291}
292
293#ifdef CONFIG_EDAC
294/*
295 * Register a platform device for CPC925 memory controller on
296 * all boards with U3H (CPC925) bridge.
297 */
298static int __init maple_cpc925_edac_setup(void)
299{
300	struct platform_device *pdev;
301	struct device_node *np = NULL;
302	struct resource r;
303	int ret;
304	volatile void __iomem *mem;
305	u32 rev;
306
307	np = of_find_node_by_type(NULL, "memory-controller");
308	if (!np) {
309		printk(KERN_ERR "%s: Unable to find memory-controller node\n",
310			__func__);
311		return -ENODEV;
312	}
313
314	ret = of_address_to_resource(np, 0, &r);
315	of_node_put(np);
316
317	if (ret < 0) {
318		printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
319			__func__);
320		return -ENODEV;
321	}
322
323	mem = ioremap(r.start, resource_size(&r));
324	if (!mem) {
325		printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
326				__func__);
327		return -ENOMEM;
328	}
329
330	rev = __raw_readl(mem);
331	iounmap(mem);
332
333	if (rev < 0x34 || rev > 0x3f) { /* U3H */
334		printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
335			__func__, rev);
336		return 0;
337	}
338
339	pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
340	if (IS_ERR(pdev))
341		return PTR_ERR(pdev);
342
343	printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
344
345	return 0;
346}
347machine_device_initcall(maple, maple_cpc925_edac_setup);
348#endif
349
350define_machine(maple) {
351	.name			= "Maple",
352	.probe			= maple_probe,
353	.setup_arch		= maple_setup_arch,
354	.init_IRQ		= maple_init_IRQ,
355	.pci_irq_fixup		= maple_pci_irq_fixup,
356	.pci_get_legacy_ide_irq	= maple_pci_get_legacy_ide_irq,
357	.restart		= maple_restart,
358	.halt			= maple_halt,
359	.get_boot_time		= maple_get_boot_time,
360	.set_rtc_time		= maple_set_rtc_time,
361	.get_rtc_time		= maple_get_rtc_time,
362	.calibrate_decr		= generic_calibrate_decr,
363	.progress		= maple_progress,
364	.power_save		= power4_idle,
365};
366