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> | |
10 | #include <linux/interrupt.h> | |
11 | #include <linux/kernel_stat.h> | |
12 | #include <linux/param.h> | |
631330f5 | 13 | #include <linux/smp.h> |
1da177e4 LT |
14 | #include <linux/time.h> |
15 | #include <linux/timex.h> | |
16 | #include <linux/mm.h> | |
3ec066cd | 17 | #include <linux/platform_device.h> |
1da177e4 LT |
18 | |
19 | #include <asm/time.h> | |
20 | #include <asm/pgtable.h> | |
21 | #include <asm/sgialib.h> | |
22 | #include <asm/sn/ioc3.h> | |
1da177e4 LT |
23 | #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 | ||
1da177e4 LT |
30 | #define TICK_SIZE (tick_nsec / 1000) |
31 | ||
1da177e4 LT |
32 | /* 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 | ||
301218df | 39 | static void enable_rt_irq(struct irq_data *d) |
06d428d7 RB |
40 | { |
41 | } | |
42 | ||
301218df | 43 | static void disable_rt_irq(struct irq_data *d) |
06d428d7 RB |
44 | { |
45 | } | |
46 | ||
47 | static struct irq_chip rt_irq_type = { | |
48 | .name = "SN HUB RT timer", | |
301218df TG |
49 | .irq_mask = disable_rt_irq, |
50 | .irq_unmask = enable_rt_irq, | |
06d428d7 RB |
51 | }; |
52 | ||
53 | static int rt_next_event(unsigned long delta, struct clock_event_device *evt) | |
e887b245 RB |
54 | { |
55 | unsigned int cpu = smp_processor_id(); | |
c8925297 | 56 | int slice = cputoslice(cpu); |
e887b245 RB |
57 | unsigned long cnt; |
58 | ||
59 | cnt = LOCAL_HUB_L(PI_RT_COUNT); | |
60 | cnt += delta; | |
725d7b36 | 61 | LOCAL_HUB_S(PI_RT_COMPARE_A + PI_COUNT_OFFSET * slice, cnt); |
e887b245 RB |
62 | |
63 | return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0; | |
64 | } | |
65 | ||
66 | static void rt_set_mode(enum clock_event_mode mode, | |
67 | struct clock_event_device *evt) | |
68 | { | |
4f0ad950 | 69 | /* Nothing to do ... */ |
e887b245 RB |
70 | } |
71 | ||
9fcb7059 | 72 | unsigned int rt_timer_irq; |
e887b245 | 73 | |
b32bb803 TB |
74 | static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent); |
75 | static DEFINE_PER_CPU(char [11], hub_rt_name); | |
76 | ||
06d428d7 | 77 | static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id) |
e887b245 | 78 | { |
e887b245 | 79 | unsigned int cpu = smp_processor_id(); |
b32bb803 | 80 | struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu); |
725d7b36 | 81 | int slice = cputoslice(cpu); |
e887b245 | 82 | |
725d7b36 RB |
83 | /* |
84 | * Ack | |
85 | */ | |
c8925297 | 86 | LOCAL_HUB_S(PI_RT_PEND_A + PI_COUNT_OFFSET * slice, 0); |
e887b245 RB |
87 | cd->event_handler(cd); |
88 | ||
89 | return IRQ_HANDLED; | |
90 | } | |
91 | ||
06d428d7 RB |
92 | struct irqaction hub_rt_irqaction = { |
93 | .handler = hub_rt_counter_handler, | |
8b5690f8 | 94 | .flags = IRQF_PERCPU | IRQF_TIMER, |
06d428d7 | 95 | .name = "hub-rt", |
3c009442 RB |
96 | }; |
97 | ||
e887b245 RB |
98 | /* |
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) | |
108 | ||
078a55fc | 109 | void hub_rt_clock_event_init(void) |
1da177e4 | 110 | { |
e887b245 | 111 | unsigned int cpu = smp_processor_id(); |
06d428d7 RB |
112 | 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; | |
115 | ||
116 | sprintf(name, "hub-rt %d", cpu); | |
b32bb803 TB |
117 | cd->name = name; |
118 | cd->features = CLOCK_EVT_FEAT_ONESHOT; | |
06d428d7 | 119 | clockevent_set_clock(cd, CYCLES_PER_SEC); |
70342287 RB |
120 | cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd); |
121 | cd->min_delta_ns = clockevent_delta2ns(0x300, cd); | |
b32bb803 TB |
122 | cd->rating = 200; |
123 | cd->irq = irq; | |
320ab2b0 | 124 | cd->cpumask = cpumask_of(cpu); |
b32bb803 TB |
125 | cd->set_next_event = rt_next_event; |
126 | cd->set_mode = rt_set_mode; | |
e887b245 | 127 | clockevents_register_device(cd); |
06d428d7 RB |
128 | } |
129 | ||
130 | static void __init hub_rt_clock_event_global_init(void) | |
131 | { | |
d0e7ba06 | 132 | int irq; |
06d428d7 RB |
133 | |
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)); | |
e887b245 | 144 | |
e4ec7989 | 145 | irq_set_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq); |
06d428d7 | 146 | setup_irq(irq, &hub_rt_irqaction); |
1da177e4 LT |
147 | } |
148 | ||
8e19608e | 149 | static cycle_t hub_rt_read(struct clocksource *cs) |
16b7b2ac AN |
150 | { |
151 | return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT); | |
152 | } | |
153 | ||
06d428d7 | 154 | struct clocksource hub_rt_clocksource = { |
e887b245 | 155 | .name = "HUB-RT", |
70342287 | 156 | .rating = 200, |
87b2335d RB |
157 | .read = hub_rt_read, |
158 | .mask = CLOCKSOURCE_MASK(52), | |
87b2335d RB |
159 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
160 | }; | |
161 | ||
06d428d7 | 162 | static void __init hub_rt_clocksource_init(void) |
1da177e4 | 163 | { |
06d428d7 RB |
164 | struct clocksource *cs = &hub_rt_clocksource; |
165 | ||
75c4fd8c | 166 | clocksource_register_hz(cs, CYCLES_PER_SEC); |
1da177e4 LT |
167 | } |
168 | ||
e887b245 RB |
169 | void __init plat_time_init(void) |
170 | { | |
06d428d7 RB |
171 | hub_rt_clocksource_init(); |
172 | hub_rt_clock_event_global_init(); | |
b32bb803 | 173 | hub_rt_clock_event_init(); |
e887b245 RB |
174 | } |
175 | ||
078a55fc | 176 | void cpu_time_init(void) |
1da177e4 LT |
177 | { |
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 | ||
078a55fc | 197 | void hub_rtc_init(cnodeid_t cnode) |
1da177e4 | 198 | { |
3ec066cd | 199 | |
1da177e4 LT |
200 | /* |
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) { | |
1da177e4 LT |
206 | 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); | |
1da177e4 LT |
210 | LOCAL_HUB_S(PI_RT_COUNT, 0); |
211 | LOCAL_HUB_S(PI_RT_PEND_A, 0); | |
1da177e4 LT |
212 | LOCAL_HUB_S(PI_RT_PEND_B, 0); |
213 | } | |
214 | } | |
3ec066cd TB |
215 | |
216 | static 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 | */ | |
234 | late_initcall(sgi_ip27_rtc_devinit); |