blob: ef74f3267f9102bfa870e713311520d94fe6c723 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Ralf Baechle54d0a212006-07-09 21:38:56 +01002 * Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Copytight (C) 1999, 2000 Silicon Graphics, Inc.
4 */
5#include <linux/bcd.h>
Ralf Baechlee887b242007-10-18 13:34:12 +01006#include <linux/clockchips.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/init.h>
8#include <linux/kernel.h>
9#include <linux/sched.h>
10#include <linux/interrupt.h>
11#include <linux/kernel_stat.h>
12#include <linux/param.h>
Ralf Baechle631330f2009-06-19 14:05:26 +010013#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/time.h>
15#include <linux/timex.h>
16#include <linux/mm.h>
Thomas Bogendoerfer3ec066c2008-10-14 17:17:28 +020017#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19#include <asm/time.h>
20#include <asm/pgtable.h>
21#include <asm/sgialib.h>
22#include <asm/sn/ioc3.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/sn/klconfig.h>
24#include <asm/sn/arch.h>
25#include <asm/sn/addrs.h>
26#include <asm/sn/sn_private.h>
27#include <asm/sn/sn0/ip27.h>
28#include <asm/sn/sn0/hub.h>
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#define TICK_SIZE (tick_nsec / 1000)
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032/* Includes for ioc3_init(). */
33#include <asm/sn/types.h>
34#include <asm/sn/sn0/addrs.h>
35#include <asm/sn/sn0/hubni.h>
36#include <asm/sn/sn0/hubio.h>
37#include <asm/pci/bridge.h>
38
Thomas Gleixner301218d2011-03-23 21:09:12 +000039static void enable_rt_irq(struct irq_data *d)
Ralf Baechle3c009442006-06-16 17:10:49 +020040{
41}
42
Thomas Gleixner301218d2011-03-23 21:09:12 +000043static void disable_rt_irq(struct irq_data *d)
Ralf Baechle3c009442006-06-16 17:10:49 +020044{
45}
46
Ralf Baechle94dee172006-07-02 14:41:42 +010047static struct irq_chip rt_irq_type = {
Atsushi Nemoto70d21cd2007-01-15 00:07:25 +090048 .name = "SN HUB RT timer",
Thomas Gleixner301218d2011-03-23 21:09:12 +000049 .irq_mask = disable_rt_irq,
50 .irq_unmask = enable_rt_irq,
Ralf Baechle3c009442006-06-16 17:10:49 +020051};
52
Ralf Baechle06d428d2007-10-22 10:34:13 +010053static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
54{
55 unsigned int cpu = smp_processor_id();
Ralf Baechlec8925292007-11-01 12:20:51 +000056 int slice = cputoslice(cpu);
Ralf Baechle06d428d2007-10-22 10:34:13 +010057 unsigned long cnt;
58
59 cnt = LOCAL_HUB_L(PI_RT_COUNT);
60 cnt += delta;
Ralf Baechle725d7b362007-10-28 23:02:37 +000061 LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt);
Ralf Baechle06d428d2007-10-22 10:34:13 +010062
63 return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
64}
65
66static void rt_set_mode(enum clock_event_mode mode,
67 struct clock_event_device *evt)
68{
Ralf Baechle4f0ad952011-05-19 09:21:28 +010069 /* Nothing to do ... */
Ralf Baechle06d428d2007-10-22 10:34:13 +010070}
71
Roel Kluind0e7ba02008-04-16 17:09:58 +020072int rt_timer_irq;
Ralf Baechlee887b242007-10-18 13:34:12 +010073
Thomas Bogendoerferb32bb802008-04-08 23:43:57 +020074static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
75static DEFINE_PER_CPU(char [11], hub_rt_name);
76
Ralf Baechle06d428d2007-10-22 10:34:13 +010077static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
Ralf Baechlee887b242007-10-18 13:34:12 +010078{
Ralf Baechlee887b242007-10-18 13:34:12 +010079 unsigned int cpu = smp_processor_id();
Thomas Bogendoerferb32bb802008-04-08 23:43:57 +020080 struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
Ralf Baechle725d7b362007-10-28 23:02:37 +000081 int slice = cputoslice(cpu);
Ralf Baechlee887b242007-10-18 13:34:12 +010082
Ralf Baechle725d7b362007-10-28 23:02:37 +000083 /*
84 * Ack
85 */
Ralf Baechlec8925292007-11-01 12:20:51 +000086 LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0);
Ralf Baechlee887b242007-10-18 13:34:12 +010087 cd->event_handler(cd);
88
89 return IRQ_HANDLED;
90}
91
Ralf Baechle06d428d2007-10-22 10:34:13 +010092struct irqaction hub_rt_irqaction = {
93 .handler = hub_rt_counter_handler,
Wu Zhangjinf45e5182009-10-08 21:17:54 +080094 .flags = IRQF_DISABLED | IRQF_PERCPU | IRQF_TIMER,
Ralf Baechle06d428d2007-10-22 10:34:13 +010095 .name = "hub-rt",
Ralf Baechle3c009442006-06-16 17:10:49 +020096};
97
Ralf Baechlee887b242007-10-18 13:34:12 +010098/*
99 * This is a hack; we really need to figure these values out dynamically
100 *
101 * Since 800 ns works very well with various HUB frequencies, such as
102 * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
103 *
104 * Ralf: which clock rate is used to feed the counter?
105 */
106#define NSEC_PER_CYCLE 800
107#define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
Ralf Baechle3c009442006-06-16 17:10:49 +0200108
Thomas Bogendoerferb32bb802008-04-08 23:43:57 +0200109void __cpuinit hub_rt_clock_event_init(void)
Ralf Baechlee887b242007-10-18 13:34:12 +0100110{
Ralf Baechlee887b242007-10-18 13:34:12 +0100111 unsigned int cpu = smp_processor_id();
Ralf Baechle06d428d2007-10-22 10:34:13 +0100112 struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
113 unsigned char *name = per_cpu(hub_rt_name, cpu);
114 int irq = rt_timer_irq;
Ralf Baechlee887b242007-10-18 13:34:12 +0100115
Ralf Baechle06d428d2007-10-22 10:34:13 +0100116 sprintf(name, "hub-rt %d", cpu);
Thomas Bogendoerferb32bb802008-04-08 23:43:57 +0200117 cd->name = name;
118 cd->features = CLOCK_EVT_FEAT_ONESHOT;
Ralf Baechle06d428d2007-10-22 10:34:13 +0100119 clockevent_set_clock(cd, CYCLES_PER_SEC);
120 cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd);
121 cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
Thomas Bogendoerferb32bb802008-04-08 23:43:57 +0200122 cd->rating = 200;
123 cd->irq = irq;
Rusty Russell320ab2b2008-12-13 21:20:26 +1030124 cd->cpumask = cpumask_of(cpu);
Thomas Bogendoerferb32bb802008-04-08 23:43:57 +0200125 cd->set_next_event = rt_next_event;
126 cd->set_mode = rt_set_mode;
Ralf Baechlee887b242007-10-18 13:34:12 +0100127 clockevents_register_device(cd);
Ralf Baechle06d428d2007-10-22 10:34:13 +0100128}
129
130static void __init hub_rt_clock_event_global_init(void)
131{
Roel Kluind0e7ba02008-04-16 17:09:58 +0200132 int irq;
Ralf Baechle06d428d2007-10-22 10:34:13 +0100133
134 do {
135 smp_wmb();
136 irq = rt_timer_irq;
137 if (irq)
138 break;
139
140 irq = allocate_irqno();
141 if (irq < 0)
142 panic("Allocation of irq number for timer failed");
143 } while (xchg(&rt_timer_irq, irq));
Ralf Baechlee887b242007-10-18 13:34:12 +0100144
Thomas Gleixnere4ec7982011-03-27 15:19:28 +0200145 irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
Ralf Baechle06d428d2007-10-22 10:34:13 +0100146 setup_irq(irq, &hub_rt_irqaction);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
Magnus Damm8e196082009-04-21 12:24:00 -0700149static cycle_t hub_rt_read(struct clocksource *cs)
Atsushi Nemoto16b7b2a2006-10-24 00:21:27 +0900150{
151 return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
152}
153
Ralf Baechle06d428d2007-10-22 10:34:13 +0100154struct clocksource hub_rt_clocksource = {
Ralf Baechlee887b242007-10-18 13:34:12 +0100155 .name = "HUB-RT",
Ralf Baechle87b23352007-10-11 23:46:10 +0100156 .rating = 200,
157 .read = hub_rt_read,
158 .mask = CLOCKSOURCE_MASK(52),
Ralf Baechle87b23352007-10-11 23:46:10 +0100159 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
160};
161
Ralf Baechle06d428d2007-10-22 10:34:13 +0100162static void __init hub_rt_clocksource_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163{
Ralf Baechle06d428d2007-10-22 10:34:13 +0100164 struct clocksource *cs = &hub_rt_clocksource;
165
John Stultz75c4fd82010-04-26 20:23:11 -0700166 clocksource_register_hz(cs, CYCLES_PER_SEC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
Ralf Baechlee887b242007-10-18 13:34:12 +0100169void __init plat_time_init(void)
170{
Ralf Baechle06d428d2007-10-22 10:34:13 +0100171 hub_rt_clocksource_init();
172 hub_rt_clock_event_global_init();
Thomas Bogendoerferb32bb802008-04-08 23:43:57 +0200173 hub_rt_clock_event_init();
Ralf Baechlee887b242007-10-18 13:34:12 +0100174}
175
Ralf Baechle06d428d2007-10-22 10:34:13 +0100176void __cpuinit cpu_time_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
178 lboard_t *board;
179 klcpu_t *cpu;
180 int cpuid;
181
182 /* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */
183 board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27);
184 if (!board)
185 panic("Can't find board info for myself.");
186
187 cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX;
188 cpu = (klcpu_t *) KLCF_COMP(board, cpuid);
189 if (!cpu)
190 panic("No information about myself?");
191
192 printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
193
194 set_c0_status(SRB_TIMOCLK);
195}
196
Ralf Baechle234fcd12008-03-08 09:56:28 +0000197void __cpuinit hub_rtc_init(cnodeid_t cnode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
Thomas Bogendoerfer3ec066c2008-10-14 17:17:28 +0200199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 /*
201 * We only need to initialize the current node.
202 * If this is not the current node then it is a cpuless
203 * node and timeouts will not happen there.
204 */
205 if (get_compact_nodeid() == cnode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 LOCAL_HUB_S(PI_RT_EN_A, 1);
207 LOCAL_HUB_S(PI_RT_EN_B, 1);
208 LOCAL_HUB_S(PI_PROF_EN_A, 0);
209 LOCAL_HUB_S(PI_PROF_EN_B, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 LOCAL_HUB_S(PI_RT_COUNT, 0);
211 LOCAL_HUB_S(PI_RT_PEND_A, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 LOCAL_HUB_S(PI_RT_PEND_B, 0);
213 }
214}
Thomas Bogendoerfer3ec066c2008-10-14 17:17:28 +0200215
216static int __init sgi_ip27_rtc_devinit(void)
217{
218 struct resource res;
219
220 memset(&res, 0, sizeof(res));
221 res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base +
222 IOC3_BYTEBUS_DEV0);
223 res.end = res.start + 32767;
224 res.flags = IORESOURCE_MEM;
225
226 return IS_ERR(platform_device_register_simple("rtc-m48t35", -1,
227 &res, 1));
228}
229
230/*
231 * kludge make this a device_initcall after ioc3 resource conflicts
232 * are resolved
233 */
234late_initcall(sgi_ip27_rtc_devinit);