/arch/powerpc/platforms/maple/setup.c

  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/pgtable.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_service_present("system-reboot") &&
167	    rtas_service_present("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	/* Lookup PCI hosts */
184       	maple_pci_init();
185
186	maple_use_rtas_reboot_and_halt_if_present();
187
188	printk(KERN_DEBUG "Using native/NAP idle loop\n");
189
190	mmio_nvram_init();
191}
192
193/*
194 * This is almost identical to pSeries and CHRP. We need to make that
195 * code generic at one point, with appropriate bits in the device-tree to
196 * identify the presence of an HT APIC
197 */
198static void __init maple_init_IRQ(void)
199{
200	struct device_node *root, *np, *mpic_node = NULL;
201	const unsigned int *opprop;
202	unsigned long openpic_addr = 0;
203	int naddr, n, i, opplen, has_isus = 0;
204	struct mpic *mpic;
205	unsigned int flags = 0;
206
207	/* Locate MPIC in the device-tree. Note that there is a bug
208	 * in Maple device-tree where the type of the controller is
209	 * open-pic and not interrupt-controller
210	 */
211
212	for_each_node_by_type(np, "interrupt-controller")
213		if (of_device_is_compatible(np, "open-pic")) {
214			mpic_node = np;
215			break;
216		}
217	if (mpic_node == NULL)
218		for_each_node_by_type(np, "open-pic") {
219			mpic_node = np;
220			break;
221		}
222	if (mpic_node == NULL) {
223		printk(KERN_ERR
224		       "Failed to locate the MPIC interrupt controller\n");
225		return;
226	}
227
228	/* Find address list in /platform-open-pic */
229	root = of_find_node_by_path("/");
230	naddr = of_n_addr_cells(root);
231	opprop = of_get_property(root, "platform-open-pic", &opplen);
232	if (opprop) {
233		openpic_addr = of_read_number(opprop, naddr);
234		has_isus = (opplen > naddr);
235		printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
236		       openpic_addr, has_isus);
237	}
238
239	BUG_ON(openpic_addr == 0);
240
241	/* Check for a big endian MPIC */
242	if (of_get_property(np, "big-endian", NULL) != NULL)
243		flags |= MPIC_BIG_ENDIAN;
244
245	/* XXX Maple specific bits */
246	flags |= MPIC_U3_HT_IRQS;
247	/* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
248	flags |= MPIC_BIG_ENDIAN;
249
250	/* Setup the openpic driver. More device-tree junks, we hard code no
251	 * ISUs for now. I'll have to revisit some stuffs with the folks doing
252	 * the firmware for those
253	 */
254	mpic = mpic_alloc(mpic_node, openpic_addr, flags,
255			  /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
256	BUG_ON(mpic == NULL);
257
258	/* Add ISUs */
259	opplen /= sizeof(u32);
260	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
261		unsigned long isuaddr = of_read_number(opprop + i, naddr);
262		mpic_assign_isu(mpic, n, isuaddr);
263	}
264
265	/* All ISUs are setup, complete initialization */
266	mpic_init(mpic);
267	ppc_md.get_irq = mpic_get_irq;
268	of_node_put(mpic_node);
269	of_node_put(root);
270}
271
272static void __init maple_progress(char *s, unsigned short hex)
273{
274	printk("*** %04x : %s\n", hex, s ? s : "");
275}
276
277
278/*
279 * Called very early, MMU is off, device-tree isn't unflattened
280 */
281static int __init maple_probe(void)
282{
283	if (!of_machine_is_compatible("Momentum,Maple") &&
284	    !of_machine_is_compatible("Momentum,Apache"))
285		return 0;
286
287	pm_power_off = maple_power_off;
288
289	iommu_init_early_dart(&maple_pci_controller_ops);
290
291	return 1;
292}
293
294#ifdef CONFIG_EDAC
295/*
296 * Register a platform device for CPC925 memory controller on
297 * all boards with U3H (CPC925) bridge.
298 */
299static int __init maple_cpc925_edac_setup(void)
300{
301	struct platform_device *pdev;
302	struct device_node *np = NULL;
303	struct resource r;
304	int ret;
305	volatile void __iomem *mem;
306	u32 rev;
307
308	np = of_find_node_by_type(NULL, "memory-controller");
309	if (!np) {
310		printk(KERN_ERR "%s: Unable to find memory-controller node\n",
311			__func__);
312		return -ENODEV;
313	}
314
315	ret = of_address_to_resource(np, 0, &r);
316	of_node_put(np);
317
318	if (ret < 0) {
319		printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
320			__func__);
321		return -ENODEV;
322	}
323
324	mem = ioremap(r.start, resource_size(&r));
325	if (!mem) {
326		printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
327				__func__);
328		return -ENOMEM;
329	}
330
331	rev = __raw_readl(mem);
332	iounmap(mem);
333
334	if (rev < 0x34 || rev > 0x3f) { /* U3H */
335		printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
336			__func__, rev);
337		return 0;
338	}
339
340	pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
341	if (IS_ERR(pdev))
342		return PTR_ERR(pdev);
343
344	printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
345
346	return 0;
347}
348machine_device_initcall(maple, maple_cpc925_edac_setup);
349#endif
350
351define_machine(maple) {
352	.name			= "Maple",
353	.probe			= maple_probe,
354	.setup_arch		= maple_setup_arch,
355	.init_IRQ		= maple_init_IRQ,
356	.pci_irq_fixup		= maple_pci_irq_fixup,
357	.pci_get_legacy_ide_irq	= maple_pci_get_legacy_ide_irq,
358	.restart		= maple_restart,
359	.halt			= maple_halt,
360	.get_boot_time		= maple_get_boot_time,
361	.set_rtc_time		= maple_set_rtc_time,
362	.get_rtc_time		= maple_get_rtc_time,
363	.calibrate_decr		= generic_calibrate_decr,
364	.progress		= maple_progress,
365	.power_save		= power4_idle,
366};