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
66static 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
92static 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
120static 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
148static void __noreturn maple_halt(void)
149{
150	maple_power_off();
151}
152
153#ifdef CONFIG_SMP
154static 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
164static 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
174static 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 */
195static 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
269static 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 */
278static 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 */
296static 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}
345machine_device_initcall(maple, maple_cpc925_edac_setup);
346#endif
347
348define_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