2 * linux/arch/ppc/kernel/setup.c
4 * Copyright (C) 1995 Linus Torvalds
5 * Adapted from 'alpha' version by Gary Thomas
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * Modified by PPC64 Team, IBM Corp
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
16 * bootup setup stuff..
21 #include <linux/config.h>
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
26 #include <linux/stddef.h>
27 #include <linux/unistd.h>
28 #include <linux/slab.h>
29 #include <linux/user.h>
30 #include <linux/a.out.h>
31 #include <linux/tty.h>
32 #include <linux/major.h>
33 #include <linux/interrupt.h>
34 #include <linux/reboot.h>
35 #include <linux/init.h>
36 #include <linux/ioport.h>
37 #include <linux/console.h>
38 #include <linux/pci.h>
39 #include <linux/version.h>
40 #include <linux/adb.h>
41 #include <linux/module.h>
42 #include <linux/delay.h>
43 #include <linux/irq.h>
44 #include <linux/seq_file.h>
45 #include <linux/root_dev.h>
48 #include <asm/processor.h>
50 #include <asm/pgtable.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/iommu.h>
56 #include <asm/machdep.h>
59 #include <asm/nvram.h>
60 #include <asm/plpar_wrappers.h>
62 #include <asm/cputable.h>
69 #define DBG(fmt...) udbg_printf(fmt)
74 extern void find_udbg_vterm(void);
75 extern void system_reset_fwnmi(void); /* from head.S */
76 extern void machine_check_fwnmi(void); /* from head.S */
77 extern void generic_find_legacy_serial_ports(u64 *physport,
78 unsigned int *default_speed);
80 int fwnmi_active; /* TRUE if an FWNMI handler is present */
82 extern void pSeries_system_reset_exception(struct pt_regs *regs);
83 extern int pSeries_machine_check_exception(struct pt_regs *regs);
85 static volatile void __iomem * chrp_int_ack_special;
86 struct mpic *pSeries_mpic;
88 void pSeries_get_cpuinfo(struct seq_file *m)
90 struct device_node *root;
91 const char *model = "";
93 root = of_find_node_by_path("/");
95 model = get_property(root, "model", NULL);
96 seq_printf(m, "machine\t\t: CHRP %s\n", model);
100 /* Initialize firmware assisted non-maskable interrupts if
101 * the firmware supports this feature.
104 static void __init fwnmi_init(void)
107 int ibm_nmi_register = rtas_token("ibm,nmi-register");
108 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
110 ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
111 __pa((unsigned long)system_reset_fwnmi),
112 __pa((unsigned long)machine_check_fwnmi));
117 static int pSeries_irq_cascade(struct pt_regs *regs, void *data)
119 if (chrp_int_ack_special)
120 return readb(chrp_int_ack_special);
122 return i8259_irq(smp_processor_id());
125 static void __init pSeries_init_mpic(void)
128 struct device_node *np;
131 /* All ISUs are setup, complete initialization */
132 mpic_init(pSeries_mpic);
134 /* Check what kind of cascade ACK we have */
135 if (!(np = of_find_node_by_name(NULL, "pci"))
136 || !(addrp = (unsigned int *)
137 get_property(np, "8259-interrupt-acknowledge", NULL)))
138 printk(KERN_ERR "Cannot find pci to get ack address\n");
140 chrp_int_ack_special = ioremap(addrp[prom_n_addr_cells(np)-1], 1);
143 /* Setup the legacy interrupts & controller */
144 for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
145 irq_desc[i].handler = &i8259_pic;
148 /* Hook cascade to mpic */
149 mpic_setup_cascade(NUM_ISA_INTERRUPTS, pSeries_irq_cascade, NULL);
152 static void __init pSeries_setup_mpic(void)
154 unsigned int *opprop;
155 unsigned long openpic_addr = 0;
156 unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
157 struct device_node *root;
160 /* Find the Open PIC if present */
161 root = of_find_node_by_path("/");
162 opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
164 int n = prom_n_addr_cells(root);
166 for (openpic_addr = 0; n > 0; --n)
167 openpic_addr = (openpic_addr << 32) + *opprop++;
168 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
172 BUG_ON(openpic_addr == 0);
174 /* Get the sense values from OF */
175 prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
177 /* Setup the openpic driver */
178 irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
179 pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
180 16, 16, irq_count, /* isu size, irq offset, irq count */
181 NR_IRQS - 4, /* ipi offset */
182 senses, irq_count, /* sense & sense size */
186 static void __init pSeries_setup_arch(void)
188 /* Fixup ppc_md depending on the type of interrupt controller */
189 if (ppc64_interrupt_controller == IC_OPEN_PIC) {
190 ppc_md.init_IRQ = pSeries_init_mpic;
191 ppc_md.get_irq = mpic_get_irq;
192 ppc_md.cpu_irq_down = mpic_teardown_this_cpu;
193 /* Allocate the mpic now, so that find_and_init_phbs() can
195 pSeries_setup_mpic();
197 ppc_md.init_IRQ = xics_init_IRQ;
198 ppc_md.get_irq = xics_get_irq;
199 ppc_md.cpu_irq_down = xics_teardown_cpu;
205 /* openpic global configuration register (64-bit format). */
206 /* openpic Interrupt Source Unit pointer (64-bit format). */
207 /* python0 facility area (mmio) (64-bit format) REAL address. */
209 /* init to some ~sane value until calibrate_delay() runs */
210 loops_per_jiffy = 50000000;
213 printk("No ramdisk, default root is /dev/sda2\n");
214 ROOT_DEV = Root_SDA2;
219 /* Find and initialize PCI host bridges */
220 init_pci_config_tokens();
222 find_and_init_phbs();
224 #ifdef CONFIG_DUMMY_CONSOLE
225 conswitchp = &dummy_con;
228 pSeries_nvram_init();
230 if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR)
231 vpa_init(boot_cpuid);
234 static int __init pSeries_init_panel(void)
236 /* Manually leave the kernel version on the panel. */
237 ppc_md.progress("Linux ppc64\n", 0);
238 ppc_md.progress(UTS_RELEASE, 0);
242 arch_initcall(pSeries_init_panel);
245 /* Build up the firmware_features bitmask field
246 * using contents of device-tree/ibm,hypertas-functions.
247 * Ultimately this functionality may be moved into prom.c prom_init().
249 void __init fw_feature_init(void)
251 struct device_node * dn;
255 DBG(" -> fw_feature_init()\n");
257 cur_cpu_spec->firmware_features = 0;
258 dn = of_find_node_by_path("/rtas");
260 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
264 hypertas = get_property(dn, "ibm,hypertas-functions", &len);
268 /* check value against table of strings */
269 for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
270 if ((firmware_features_table[i].name) &&
271 (strcmp(firmware_features_table[i].name,hypertas))==0) {
272 /* we have a match */
273 cur_cpu_spec->firmware_features |=
274 (firmware_features_table[i].val);
278 hypertas_len = strlen(hypertas);
279 len -= hypertas_len +1;
280 hypertas+= hypertas_len +1;
286 printk(KERN_INFO "firmware_features = 0x%lx\n",
287 cur_cpu_spec->firmware_features);
289 DBG(" <- fw_feature_init()\n");
293 static void __init pSeries_discover_pic(void)
295 struct device_node *np;
299 * Setup interrupt mapping options that are needed for finish_device_tree
300 * to properly parse the OF interrupt tree & do the virtual irq mapping
302 __irq_offset_value = NUM_ISA_INTERRUPTS;
303 ppc64_interrupt_controller = IC_INVALID;
304 for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
305 typep = (char *)get_property(np, "compatible", NULL);
306 if (strstr(typep, "open-pic"))
307 ppc64_interrupt_controller = IC_OPEN_PIC;
308 else if (strstr(typep, "ppc-xicp"))
309 ppc64_interrupt_controller = IC_PPC_XIC;
311 printk("pSeries_discover_pic: failed to recognize"
312 " interrupt-controller\n");
317 static void pSeries_mach_cpu_die(void)
321 /* Some hardware requires clearing the CPPR, while other hardware does not
322 * it is safe either way
324 pSeriesLP_cppr_info(0, 0);
326 /* Should never get here... */
333 * Early initialization. Relocation is on but do not reference unbolted pages
335 static void __init pSeries_init_early(void)
339 unsigned int default_speed;
342 DBG(" -> pSeries_init_early()\n");
346 if (systemcfg->platform & PLATFORM_LPAR)
350 iommu_off = (of_chosen &&
351 get_property(of_chosen, "linux,iommu-off", NULL));
354 generic_find_legacy_serial_ports(&physport, &default_speed);
356 if (systemcfg->platform & PLATFORM_LPAR)
359 /* Map the uart for udbg. */
360 comport = (void *)ioremap(physport, 16);
361 udbg_init_uart(comport, default_speed);
363 ppc_md.udbg_putc = udbg_putc;
364 ppc_md.udbg_getc = udbg_getc;
365 ppc_md.udbg_getc_poll = udbg_getc_poll;
366 DBG("Hello World !\n");
370 iommu_init_early_pSeries();
372 pSeries_discover_pic();
374 DBG(" <- pSeries_init_early()\n");
378 static int pSeries_check_legacy_ioport(unsigned int baseport)
380 struct device_node *np;
382 #define I8042_DATA_REG 0x60
383 #define FDC_BASE 0x3f0
388 np = of_find_node_by_type(NULL, "8042");
394 np = of_find_node_by_type(NULL, "fdc");
404 * Called very early, MMU is off, device-tree isn't unflattened
406 extern struct machdep_calls pSeries_md;
408 static int __init pSeries_probe(int platform)
410 if (platform != PLATFORM_PSERIES &&
411 platform != PLATFORM_PSERIES_LPAR)
414 /* if we have some ppc_md fixups for LPAR to do, do
421 struct machdep_calls __initdata pSeries_md = {
422 .probe = pSeries_probe,
423 .setup_arch = pSeries_setup_arch,
424 .init_early = pSeries_init_early,
425 .get_cpuinfo = pSeries_get_cpuinfo,
426 .log_error = pSeries_log_error,
427 .pcibios_fixup = pSeries_final_fixup,
428 .irq_bus_setup = pSeries_irq_bus_setup,
429 .restart = rtas_restart,
430 .power_off = rtas_power_off,
432 .panic = rtas_os_term,
433 .cpu_die = pSeries_mach_cpu_die,
434 .get_boot_time = rtas_get_boot_time,
435 .get_rtc_time = rtas_get_rtc_time,
436 .set_rtc_time = rtas_set_rtc_time,
437 .calibrate_decr = generic_calibrate_decr,
438 .progress = rtas_progress,
439 .check_legacy_ioport = pSeries_check_legacy_ioport,
440 .system_reset_exception = pSeries_system_reset_exception,
441 .machine_check_exception = pSeries_machine_check_exception,