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
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