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

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  1 /*
  2  *  Maple (970 eval board) setup code
  3  *
  4  *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
  5  *                     IBM Corp. 
  6  *
  7  *  This program is free software; you can redistribute it and/or
  8  *  modify it under the terms of the GNU General Public License
  9  *  as published by the Free Software Foundation; either version
 10  *  2 of the License, or (at your option) any later version.
 11  *
 12  */
 13 
 14 #undef DEBUG
 15 
 16 #include <linux/init.h>
 17 #include <linux/errno.h>
 18 #include <linux/sched.h>
 19 #include <linux/kernel.h>
 20 #include <linux/export.h>
 21 #include <linux/mm.h>
 22 #include <linux/stddef.h>
 23 #include <linux/unistd.h>
 24 #include <linux/ptrace.h>
 25 #include <linux/user.h>
 26 #include <linux/tty.h>
 27 #include <linux/string.h>
 28 #include <linux/delay.h>
 29 #include <linux/ioport.h>
 30 #include <linux/major.h>
 31 #include <linux/initrd.h>
 32 #include <linux/vt_kern.h>
 33 #include <linux/console.h>
 34 #include <linux/pci.h>
 35 #include <linux/adb.h>
 36 #include <linux/cuda.h>
 37 #include <linux/pmu.h>
 38 #include <linux/irq.h>
 39 #include <linux/seq_file.h>
 40 #include <linux/root_dev.h>
 41 #include <linux/serial.h>
 42 #include <linux/smp.h>
 43 #include <linux/bitops.h>
 44 #include <linux/of_device.h>
 45 #include <linux/memblock.h>
 46 
 47 #include <asm/processor.h>
 48 #include <asm/sections.h>
 49 #include <asm/prom.h>
 50 #include <asm/pgtable.h>
 51 #include <asm/io.h>
 52 #include <asm/pci-bridge.h>
 53 #include <asm/iommu.h>
 54 #include <asm/machdep.h>
 55 #include <asm/dma.h>
 56 #include <asm/cputable.h>
 57 #include <asm/time.h>
 58 #include <asm/mpic.h>
 59 #include <asm/rtas.h>
 60 #include <asm/udbg.h>
 61 #include <asm/nvram.h>
 62 
 63 #include "maple.h"
 64 
 65 #ifdef DEBUG
 66 #define DBG(fmt...) udbg_printf(fmt)
 67 #else
 68 #define DBG(fmt...)
 69 #endif
 70 
 71 static unsigned long maple_find_nvram_base(void)
 72 {
 73         struct device_node *rtcs;
 74         unsigned long result = 0;
 75 
 76         /* find NVRAM device */
 77         rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
 78         if (rtcs) {
 79                 struct resource r;
 80                 if (of_address_to_resource(rtcs, 0, &r)) {
 81                         printk(KERN_EMERG "Maple: Unable to translate NVRAM"
 82                                " address\n");
 83                         goto bail;
 84                 }
 85                 if (!(r.flags & IORESOURCE_IO)) {
 86                         printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
 87                         goto bail;
 88                 }
 89                 result = r.start;
 90         } else
 91                 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
 92  bail:
 93         of_node_put(rtcs);
 94         return result;
 95 }
 96 
 97 static void maple_restart(char *cmd)
 98 {
 99         unsigned int maple_nvram_base;
100         const unsigned int *maple_nvram_offset, *maple_nvram_command;
101         struct device_node *sp;
102 
103         maple_nvram_base = maple_find_nvram_base();
104         if (maple_nvram_base == 0)
105                 goto fail;
106 
107         /* find service processor device */
108         sp = of_find_node_by_name(NULL, "service-processor");
109         if (!sp) {
110                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
111                 goto fail;
112         }
113         maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
114         maple_nvram_command = of_get_property(sp, "restart-value", NULL);
115         of_node_put(sp);
116 
117         /* send command */
118         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
119         for (;;) ;
120  fail:
121         printk(KERN_EMERG "Maple: Manual Restart Required\n");
122 }
123 
124 static void maple_power_off(void)
125 {
126         unsigned int maple_nvram_base;
127         const unsigned int *maple_nvram_offset, *maple_nvram_command;
128         struct device_node *sp;
129 
130         maple_nvram_base = maple_find_nvram_base();
131         if (maple_nvram_base == 0)
132                 goto fail;
133 
134         /* find service processor device */
135         sp = of_find_node_by_name(NULL, "service-processor");
136         if (!sp) {
137                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
138                 goto fail;
139         }
140         maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
141         maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
142         of_node_put(sp);
143 
144         /* send command */
145         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
146         for (;;) ;
147  fail:
148         printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
149 }
150 
151 static void maple_halt(void)
152 {
153         maple_power_off();
154 }
155 
156 #ifdef CONFIG_SMP
157 struct smp_ops_t maple_smp_ops = {
158         .probe          = smp_mpic_probe,
159         .message_pass   = smp_mpic_message_pass,
160         .kick_cpu       = smp_generic_kick_cpu,
161         .setup_cpu      = smp_mpic_setup_cpu,
162         .give_timebase  = smp_generic_give_timebase,
163         .take_timebase  = smp_generic_take_timebase,
164 };
165 #endif /* CONFIG_SMP */
166 
167 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
168 {
169         if (rtas_service_present("system-reboot") &&
170             rtas_service_present("power-off")) {
171                 ppc_md.restart = rtas_restart;
172                 ppc_md.power_off = rtas_power_off;
173                 ppc_md.halt = rtas_halt;
174         }
175 }
176 
177 void __init maple_setup_arch(void)
178 {
179         /* init to some ~sane value until calibrate_delay() runs */
180         loops_per_jiffy = 50000000;
181 
182         /* Setup SMP callback */
183 #ifdef CONFIG_SMP
184         smp_ops = &maple_smp_ops;
185 #endif
186         /* Lookup PCI hosts */
187         maple_pci_init();
188 
189 #ifdef CONFIG_DUMMY_CONSOLE
190         conswitchp = &dummy_con;
191 #endif
192         maple_use_rtas_reboot_and_halt_if_present();
193 
194         printk(KERN_DEBUG "Using native/NAP idle loop\n");
195 
196         mmio_nvram_init();
197 }
198 
199 /* 
200  * Early initialization.
201  */
202 static void __init maple_init_early(void)
203 {
204         DBG(" -> maple_init_early\n");
205 
206         iommu_init_early_dart();
207 
208         DBG(" <- maple_init_early\n");
209 }
210 
211 /*
212  * This is almost identical to pSeries and CHRP. We need to make that
213  * code generic at one point, with appropriate bits in the device-tree to
214  * identify the presence of an HT APIC
215  */
216 static void __init maple_init_IRQ(void)
217 {
218         struct device_node *root, *np, *mpic_node = NULL;
219         const unsigned int *opprop;
220         unsigned long openpic_addr = 0;
221         int naddr, n, i, opplen, has_isus = 0;
222         struct mpic *mpic;
223         unsigned int flags = 0;
224 
225         /* Locate MPIC in the device-tree. Note that there is a bug
226          * in Maple device-tree where the type of the controller is
227          * open-pic and not interrupt-controller
228          */
229 
230         for_each_node_by_type(np, "interrupt-controller")
231                 if (of_device_is_compatible(np, "open-pic")) {
232                         mpic_node = np;
233                         break;
234                 }
235         if (mpic_node == NULL)
236                 for_each_node_by_type(np, "open-pic") {
237                         mpic_node = np;
238                         break;
239                 }
240         if (mpic_node == NULL) {
241                 printk(KERN_ERR
242                        "Failed to locate the MPIC interrupt controller\n");
243                 return;
244         }
245 
246         /* Find address list in /platform-open-pic */
247         root = of_find_node_by_path("/");
248         naddr = of_n_addr_cells(root);
249         opprop = of_get_property(root, "platform-open-pic", &opplen);
250         if (opprop != 0) {
251                 openpic_addr = of_read_number(opprop, naddr);
252                 has_isus = (opplen > naddr);
253                 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
254                        openpic_addr, has_isus);
255         }
256 
257         BUG_ON(openpic_addr == 0);
258 
259         /* Check for a big endian MPIC */
260         if (of_get_property(np, "big-endian", NULL) != NULL)
261                 flags |= MPIC_BIG_ENDIAN;
262 
263         /* XXX Maple specific bits */
264         flags |= MPIC_U3_HT_IRQS;
265         /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
266         flags |= MPIC_BIG_ENDIAN;
267 
268         /* Setup the openpic driver. More device-tree junks, we hard code no
269          * ISUs for now. I'll have to revisit some stuffs with the folks doing
270          * the firmware for those
271          */
272         mpic = mpic_alloc(mpic_node, openpic_addr, flags,
273                           /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
274         BUG_ON(mpic == NULL);
275 
276         /* Add ISUs */
277         opplen /= sizeof(u32);
278         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
279                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
280                 mpic_assign_isu(mpic, n, isuaddr);
281         }
282 
283         /* All ISUs are setup, complete initialization */
284         mpic_init(mpic);
285         ppc_md.get_irq = mpic_get_irq;
286         of_node_put(mpic_node);
287         of_node_put(root);
288 }
289 
290 static void __init maple_progress(char *s, unsigned short hex)
291 {
292         printk("*** %04x : %s\n", hex, s ? s : "");
293 }
294 
295 
296 /*
297  * Called very early, MMU is off, device-tree isn't unflattened
298  */
299 static int __init maple_probe(void)
300 {
301         unsigned long root = of_get_flat_dt_root();
302 
303         if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
304             !of_flat_dt_is_compatible(root, "Momentum,Apache"))
305                 return 0;
306         /*
307          * On U3, the DART (iommu) must be allocated now since it
308          * has an impact on htab_initialize (due to the large page it
309          * occupies having to be broken up so the DART itself is not
310          * part of the cacheable linar mapping
311          */
312         alloc_dart_table();
313 
314         hpte_init_native();
315 
316         return 1;
317 }
318 
319 define_machine(maple) {
320         .name                   = "Maple",
321         .probe                  = maple_probe,
322         .setup_arch             = maple_setup_arch,
323         .init_early             = maple_init_early,
324         .init_IRQ               = maple_init_IRQ,
325         .pci_irq_fixup          = maple_pci_irq_fixup,
326         .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
327         .restart                = maple_restart,
328         .power_off              = maple_power_off,
329         .halt                   = maple_halt,
330         .get_boot_time          = maple_get_boot_time,
331         .set_rtc_time           = maple_set_rtc_time,
332         .get_rtc_time           = maple_get_rtc_time,
333         .calibrate_decr         = generic_calibrate_decr,
334         .progress               = maple_progress,
335         .power_save             = power4_idle,
336 };
337 
338 #ifdef CONFIG_EDAC
339 /*
340  * Register a platform device for CPC925 memory controller on
341  * all boards with U3H (CPC925) bridge.
342  */
343 static int __init maple_cpc925_edac_setup(void)
344 {
345         struct platform_device *pdev;
346         struct device_node *np = NULL;
347         struct resource r;
348         int ret;
349         volatile void __iomem *mem;
350         u32 rev;
351 
352         np = of_find_node_by_type(NULL, "memory-controller");
353         if (!np) {
354                 printk(KERN_ERR "%s: Unable to find memory-controller node\n",
355                         __func__);
356                 return -ENODEV;
357         }
358 
359         ret = of_address_to_resource(np, 0, &r);
360         of_node_put(np);
361 
362         if (ret < 0) {
363                 printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
364                         __func__);
365                 return -ENODEV;
366         }
367 
368         mem = ioremap(r.start, resource_size(&r));
369         if (!mem) {
370                 printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
371                                 __func__);
372                 return -ENOMEM;
373         }
374 
375         rev = __raw_readl(mem);
376         iounmap(mem);
377 
378         if (rev < 0x34 || rev > 0x3f) { /* U3H */
379                 printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
380                         __func__, rev);
381                 return 0;
382         }
383 
384         pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
385         if (IS_ERR(pdev))
386                 return PTR_ERR(pdev);
387 
388         printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
389 
390         return 0;
391 }
392 machine_device_initcall(maple, maple_cpc925_edac_setup);
393 #endif
394 

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