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13#include <linux/errno.h>
14#include <linux/sched.h>
15#include <linux/kernel.h>
16#include <linux/param.h>
17#include <linux/string.h>
18#include <linux/mm.h>
19#include <linux/init.h>
20#include <linux/time.h>
21#include <linux/adb.h>
22#include <linux/cuda.h>
23#include <linux/pmu.h>
24#include <linux/interrupt.h>
25#include <linux/hardirq.h>
26#include <linux/rtc.h>
27
28#include <asm/sections.h>
29#include <asm/prom.h>
30#include <asm/io.h>
31#include <asm/machdep.h>
32#include <asm/time.h>
33#include <asm/nvram.h>
34#include <asm/smu.h>
35
36#include "pmac.h"
37
38#undef DEBUG
39
40#ifdef DEBUG
41#define DBG(x...) printk(x)
42#else
43#define DBG(x...)
44#endif
45
46
47
48
49#define VIA_TIMER_FREQ_6 4700000
50
51
52#define RS 0x200
53#define T1CL (4*RS)
54#define T1CH (5*RS)
55#define T1LL (6*RS)
56#define T1LH (7*RS)
57#define ACR (11*RS)
58#define IFR (13*RS)
59
60
61#define T1MODE 0xc0
62#define T1MODE_CONT 0x40
63
64
65#define T1_INT 0x40
66
67long __init pmac_time_init(void)
68{
69 s32 delta = 0;
70#if defined(CONFIG_NVRAM) && defined(CONFIG_PPC32)
71 int dst;
72
73 delta = ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x9)) << 16;
74 delta |= ((s32)pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xa)) << 8;
75 delta |= pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0xb);
76 if (delta & 0x00800000UL)
77 delta |= 0xFF000000UL;
78 dst = ((pmac_xpram_read(PMAC_XPRAM_MACHINE_LOC + 0x8) & 0x80) != 0);
79 printk("GMT Delta read from XPRAM: %d minutes, DST: %s\n", delta/60,
80 dst ? "on" : "off");
81#endif
82 return delta;
83}
84
85#ifdef CONFIG_PMAC_SMU
86static time64_t smu_get_time(void)
87{
88 struct rtc_time tm;
89
90 if (smu_get_rtc_time(&tm, 1))
91 return 0;
92 return rtc_tm_to_time64(&tm);
93}
94#endif
95
96
97time64_t pmac_get_boot_time(void)
98{
99
100 switch (sys_ctrler) {
101#ifdef CONFIG_ADB_CUDA
102 case SYS_CTRLER_CUDA:
103 return cuda_get_time();
104#endif
105#ifdef CONFIG_ADB_PMU
106 case SYS_CTRLER_PMU:
107 return pmu_get_time();
108#endif
109#ifdef CONFIG_PMAC_SMU
110 case SYS_CTRLER_SMU:
111 return smu_get_time();
112#endif
113 default:
114 return 0;
115 }
116}
117
118void pmac_get_rtc_time(struct rtc_time *tm)
119{
120
121 switch (sys_ctrler) {
122#ifdef CONFIG_ADB_CUDA
123 case SYS_CTRLER_CUDA:
124 rtc_time64_to_tm(cuda_get_time(), tm);
125 break;
126#endif
127#ifdef CONFIG_ADB_PMU
128 case SYS_CTRLER_PMU:
129 rtc_time64_to_tm(pmu_get_time(), tm);
130 break;
131#endif
132#ifdef CONFIG_PMAC_SMU
133 case SYS_CTRLER_SMU:
134 smu_get_rtc_time(tm, 1);
135 break;
136#endif
137 default:
138 ;
139 }
140}
141
142int pmac_set_rtc_time(struct rtc_time *tm)
143{
144 switch (sys_ctrler) {
145#ifdef CONFIG_ADB_CUDA
146 case SYS_CTRLER_CUDA:
147 return cuda_set_rtc_time(tm);
148#endif
149#ifdef CONFIG_ADB_PMU
150 case SYS_CTRLER_PMU:
151 return pmu_set_rtc_time(tm);
152#endif
153#ifdef CONFIG_PMAC_SMU
154 case SYS_CTRLER_SMU:
155 return smu_set_rtc_time(tm, 1);
156#endif
157 default:
158 return -ENODEV;
159 }
160}
161
162#ifdef CONFIG_PPC32
163
164
165
166
167static int __init via_calibrate_decr(void)
168{
169 struct device_node *vias;
170 volatile unsigned char __iomem *via;
171 int count = VIA_TIMER_FREQ_6 / 100;
172 unsigned int dstart, dend;
173 struct resource rsrc;
174
175 vias = of_find_node_by_name(NULL, "via-cuda");
176 if (vias == NULL)
177 vias = of_find_node_by_name(NULL, "via-pmu");
178 if (vias == NULL)
179 vias = of_find_node_by_name(NULL, "via");
180 if (vias == NULL || of_address_to_resource(vias, 0, &rsrc)) {
181 of_node_put(vias);
182 return 0;
183 }
184 of_node_put(vias);
185 via = ioremap(rsrc.start, resource_size(&rsrc));
186 if (via == NULL) {
187 printk(KERN_ERR "Failed to map VIA for timer calibration !\n");
188 return 0;
189 }
190
191
192 out_8(&via[ACR], (via[ACR] & ~T1MODE) | T1MODE_CONT);
193
194 out_8(&via[T1CH], 2);
195
196 out_8(&via[T1LL], count);
197 out_8(&via[T1LH], count >> 8);
198
199 while ((in_8(&via[IFR]) & T1_INT) == 0)
200 ;
201 dstart = get_dec();
202
203 in_8(&via[T1CL]);
204 while ((in_8(&via[IFR]) & T1_INT) == 0)
205 ;
206 dend = get_dec();
207
208 ppc_tb_freq = (dstart - dend) * 100 / 6;
209
210 iounmap(via);
211
212 return 1;
213}
214#endif
215
216
217
218
219void __init pmac_calibrate_decr(void)
220{
221 generic_calibrate_decr();
222
223#ifdef CONFIG_PPC32
224
225
226
227
228 if (!of_machine_is_compatible("MacRISC2") &&
229 !of_machine_is_compatible("MacRISC3") &&
230 !of_machine_is_compatible("MacRISC4"))
231 if (via_calibrate_decr())
232 return;
233
234
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236
237
238
239 if (of_machine_is_compatible("PowerMac3,5"))
240 if (via_calibrate_decr())
241 return;
242#endif
243}
244