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
maple_find_nvram_base(void)65 static 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
maple_restart(char * cmd)91 static 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
maple_power_off(void)119 static 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
maple_halt(void)147 static void __noreturn maple_halt(void)
148 {
149 maple_power_off();
150 }
151
152 #ifdef CONFIG_SMP
153 static 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
maple_use_rtas_reboot_and_halt_if_present(void)163 static 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
maple_setup_arch(void)173 static 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 */
maple_init_IRQ(void)197 static 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
maple_progress(char * s,unsigned short hex)271 static 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 */
maple_probe(void)280 static 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 */
maple_cpc925_edac_setup(void)298 static 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 }
347 machine_device_initcall(maple, maple_cpc925_edac_setup);
348 #endif
349
define_machine(maple)350 define_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