Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
54d0a216 | 2 | * Copytight (C) 1999, 2000, 05, 06 Ralf Baechle (ralf@linux-mips.org) |
1da177e4 LT |
3 | * Copytight (C) 1999, 2000 Silicon Graphics, Inc. |
4 | */ | |
5 | #include <linux/bcd.h> | |
e887b245 | 6 | #include <linux/clockchips.h> |
1da177e4 LT |
7 | #include <linux/init.h> |
8 | #include <linux/kernel.h> | |
9 | #include <linux/sched.h> | |
c41cef36 | 10 | #include <linux/sched_clock.h> |
1da177e4 LT |
11 | #include <linux/interrupt.h> |
12 | #include <linux/kernel_stat.h> | |
13 | #include <linux/param.h> | |
631330f5 | 14 | #include <linux/smp.h> |
1da177e4 LT |
15 | #include <linux/time.h> |
16 | #include <linux/timex.h> | |
17 | #include <linux/mm.h> | |
3ec066cd | 18 | #include <linux/platform_device.h> |
1da177e4 LT |
19 | |
20 | #include <asm/time.h> | |
21 | #include <asm/pgtable.h> | |
22 | #include <asm/sgialib.h> | |
23 | #include <asm/sn/ioc3.h> | |
1da177e4 LT |
24 | #include <asm/sn/klconfig.h> |
25 | #include <asm/sn/arch.h> | |
26 | #include <asm/sn/addrs.h> | |
27 | #include <asm/sn/sn_private.h> | |
28 | #include <asm/sn/sn0/ip27.h> | |
29 | #include <asm/sn/sn0/hub.h> | |
30 | ||
1da177e4 LT |
31 | #define TICK_SIZE (tick_nsec / 1000) |
32 | ||
1da177e4 LT |
33 | /* Includes for ioc3_init(). */ |
34 | #include <asm/sn/types.h> | |
35 | #include <asm/sn/sn0/addrs.h> | |
36 | #include <asm/sn/sn0/hubni.h> | |
37 | #include <asm/sn/sn0/hubio.h> | |
38 | #include <asm/pci/bridge.h> | |
39 | ||
301218df | 40 | static void enable_rt_irq(struct irq_data *d) |
06d428d7 RB |
41 | { |
42 | } | |
43 | ||
301218df | 44 | static void disable_rt_irq(struct irq_data *d) |
06d428d7 RB |
45 | { |
46 | } | |
47 | ||
48 | static struct irq_chip rt_irq_type = { | |
49 | .name = "SN HUB RT timer", | |
301218df TG |
50 | .irq_mask = disable_rt_irq, |
51 | .irq_unmask = enable_rt_irq, | |
06d428d7 RB |
52 | }; |
53 | ||
54 | static int rt_next_event(unsigned long delta, struct clock_event_device *evt) | |
e887b245 RB |
55 | { |
56 | unsigned int cpu = smp_processor_id(); | |
c8925297 | 57 | int slice = cputoslice(cpu); |
e887b245 RB |
58 | unsigned long cnt; |
59 | ||
60 | cnt = LOCAL_HUB_L(PI_RT_COUNT); | |
61 | cnt += delta; | |
725d7b36 | 62 | LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt); |
e887b245 RB |
63 | |
64 | return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0; | |
65 | } | |
66 | ||
9fcb7059 | 67 | unsigned int rt_timer_irq; |
e887b245 | 68 | |
b32bb803 TB |
69 | static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent); |
70 | static DEFINE_PER_CPU(char [11], hub_rt_name); | |
71 | ||
06d428d7 | 72 | static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id) |
e887b245 | 73 | { |
e887b245 | 74 | unsigned int cpu = smp_processor_id(); |
b32bb803 | 75 | struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
725d7b36 | 76 | int slice = cputoslice(cpu); |
e887b245 | 77 | |
725d7b36 RB |
78 | /* |
79 | * Ack | |
80 | */ | |
c8925297 | 81 | LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0); |
e887b245 RB |
82 | cd->event_handler(cd); |
83 | ||
84 | return IRQ_HANDLED; | |
85 | } | |
86 | ||
06d428d7 RB |
87 | struct irqaction hub_rt_irqaction = { |
88 | .handler = hub_rt_counter_handler, | |
8b5690f8 | 89 | .flags = IRQF_PERCPU | IRQF_TIMER, |
06d428d7 | 90 | .name = "hub-rt", |
3c009442 RB |
91 | }; |
92 | ||
e887b245 RB |
93 | /* |
94 | * This is a hack; we really need to figure these values out dynamically | |
95 | * | |
96 | * Since 800 ns works very well with various HUB frequencies, such as | |
97 | * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time. | |
98 | * | |
99 | * Ralf: which clock rate is used to feed the counter? | |
100 | */ | |
101 | #define NSEC_PER_CYCLE 800 | |
102 | #define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE) | |
103 | ||
078a55fc | 104 | void hub_rt_clock_event_init(void) |
1da177e4 | 105 | { |
e887b245 | 106 | unsigned int cpu = smp_processor_id(); |
06d428d7 RB |
107 | struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
108 | unsigned char *name = per_cpu(hub_rt_name, cpu); | |
109 | int irq = rt_timer_irq; | |
110 | ||
111 | sprintf(name, "hub-rt %d", cpu); | |
b32bb803 TB |
112 | cd->name = name; |
113 | cd->features = CLOCK_EVT_FEAT_ONESHOT; | |
06d428d7 | 114 | clockevent_set_clock(cd, CYCLES_PER_SEC); |
70342287 RB |
115 | cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd); |
116 | cd->min_delta_ns = clockevent_delta2ns(0x300, cd); | |
b32bb803 TB |
117 | cd->rating = 200; |
118 | cd->irq = irq; | |
320ab2b0 | 119 | cd->cpumask = cpumask_of(cpu); |
b32bb803 | 120 | cd->set_next_event = rt_next_event; |
e887b245 | 121 | clockevents_register_device(cd); |
06d428d7 RB |
122 | } |
123 | ||
124 | static void __init hub_rt_clock_event_global_init(void) | |
125 | { | |
d0e7ba06 | 126 | int irq; |
06d428d7 RB |
127 | |
128 | do { | |
129 | smp_wmb(); | |
130 | irq = rt_timer_irq; | |
131 | if (irq) | |
132 | break; | |
133 | ||
134 | irq = allocate_irqno(); | |
135 | if (irq < 0) | |
136 | panic("Allocation of irq number for timer failed"); | |
137 | } while (xchg(&rt_timer_irq, irq)); | |
e887b245 | 138 | |
e4ec7989 | 139 | irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq); |
06d428d7 | 140 | setup_irq(irq, &hub_rt_irqaction); |
1da177e4 LT |
141 | } |
142 | ||
8e19608e | 143 | static cycle_t hub_rt_read(struct clocksource *cs) |
16b7b2ac AN |
144 | { |
145 | return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); | |
146 | } | |
147 | ||
06d428d7 | 148 | struct clocksource hub_rt_clocksource = { |
e887b245 | 149 | .name = "HUB-RT", |
70342287 | 150 | .rating = 200, |
87b2335d RB |
151 | .read = hub_rt_read, |
152 | .mask = CLOCKSOURCE_MASK(52), | |
87b2335d RB |
153 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
154 | }; | |
155 | ||
c41cef36 DCZ |
156 | static u64 notrace hub_rt_read_sched_clock(void) |
157 | { | |
158 | return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); | |
159 | } | |
160 | ||
06d428d7 | 161 | static void __init hub_rt_clocksource_init(void) |
1da177e4 | 162 | { |
06d428d7 RB |
163 | struct clocksource *cs = &hub_rt_clocksource; |
164 | ||
75c4fd8c | 165 | clocksource_register_hz(cs, CYCLES_PER_SEC); |
c41cef36 DCZ |
166 | |
167 | sched_clock_register(hub_rt_read_sched_clock, 52, CYCLES_PER_SEC); | |
1da177e4 LT |
168 | } |
169 | ||
e887b245 RB |
170 | void __init plat_time_init(void) |
171 | { | |
06d428d7 RB |
172 | hub_rt_clocksource_init(); |
173 | hub_rt_clock_event_global_init(); | |
b32bb803 | 174 | hub_rt_clock_event_init(); |
e887b245 RB |
175 | } |
176 | ||
078a55fc | 177 | void cpu_time_init(void) |
1da177e4 LT |
178 | { |
179 | lboard_t *board; | |
180 | klcpu_t *cpu; | |
181 | int cpuid; | |
182 | ||
183 | /* Don't use ARCS. ARCS is fragile. Klconfig is simple and sane. */ | |
184 | board = find_lboard(KL_CONFIG_INFO(get_nasid()), KLTYPE_IP27); | |
185 | if (!board) | |
186 | panic("Can't find board info for myself."); | |
187 | ||
188 | cpuid = LOCAL_HUB_L(PI_CPU_NUM) ? IP27_CPU0_INDEX : IP27_CPU1_INDEX; | |
189 | cpu = (klcpu_t *) KLCF_COMP(board, cpuid); | |
190 | if (!cpu) | |
191 | panic("No information about myself?"); | |
192 | ||
193 | printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed); | |
194 | ||
195 | set_c0_status(SRB_TIMOCLK); | |
196 | } | |
197 | ||
078a55fc | 198 | void hub_rtc_init(cnodeid_t cnode) |
1da177e4 | 199 | { |
3ec066cd | 200 | |
1da177e4 LT |
201 | /* |
202 | * We only need to initialize the current node. | |
203 | * If this is not the current node then it is a cpuless | |
204 | * node and timeouts will not happen there. | |
205 | */ | |
206 | if (get_compact_nodeid() == cnode) { | |
1da177e4 LT |
207 | LOCAL_HUB_S(PI_RT_EN_A, 1); |
208 | LOCAL_HUB_S(PI_RT_EN_B, 1); | |
209 | LOCAL_HUB_S(PI_PROF_EN_A, 0); | |
210 | LOCAL_HUB_S(PI_PROF_EN_B, 0); | |
1da177e4 LT |
211 | LOCAL_HUB_S(PI_RT_COUNT, 0); |
212 | LOCAL_HUB_S(PI_RT_PEND_A, 0); | |
1da177e4 LT |
213 | LOCAL_HUB_S(PI_RT_PEND_B, 0); |
214 | } | |
215 | } | |
3ec066cd TB |
216 | |
217 | static int __init sgi_ip27_rtc_devinit(void) | |
218 | { | |
219 | struct resource res; | |
220 | ||
221 | memset(&res, 0, sizeof(res)); | |
222 | res.start = XPHYSADDR(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base + | |
223 | IOC3_BYTEBUS_DEV0); | |
224 | res.end = res.start + 32767; | |
225 | res.flags = IORESOURCE_MEM; | |
226 | ||
227 | return IS_ERR(platform_device_register_simple("rtc-m48t35", -1, | |
228 | &res, 1)); | |
229 | } | |
230 | ||
231 | /* | |
232 | * kludge make this a device_initcall after ioc3 resource conflicts | |
233 | * are resolved | |
234 | */ | |
235 | late_initcall(sgi_ip27_rtc_devinit); |