diff options
Diffstat (limited to 'arch/mips/lasat/ds1603.c')
-rw-r--r-- | arch/mips/lasat/ds1603.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/arch/mips/lasat/ds1603.c b/arch/mips/lasat/ds1603.c deleted file mode 100644 index 7dced67c55eb..000000000000 --- a/arch/mips/lasat/ds1603.c +++ /dev/null | |||
@@ -1,183 +0,0 @@ | |||
1 | /* | ||
2 | * Dallas Semiconductors 1603 RTC driver | ||
3 | * | ||
4 | * Brian Murphy <brian@murphy.dk> | ||
5 | * | ||
6 | */ | ||
7 | #include <linux/kernel.h> | ||
8 | #include <asm/lasat/lasat.h> | ||
9 | #include <linux/delay.h> | ||
10 | #include <asm/lasat/ds1603.h> | ||
11 | #include <asm/time.h> | ||
12 | |||
13 | #include "ds1603.h" | ||
14 | |||
15 | #define READ_TIME_CMD 0x81 | ||
16 | #define SET_TIME_CMD 0x80 | ||
17 | #define TRIMMER_SET_CMD 0xC0 | ||
18 | #define TRIMMER_VALUE_MASK 0x38 | ||
19 | #define TRIMMER_SHIFT 3 | ||
20 | |||
21 | struct ds_defs *ds1603 = NULL; | ||
22 | |||
23 | /* HW specific register functions */ | ||
24 | static void rtc_reg_write(unsigned long val) | ||
25 | { | ||
26 | *ds1603->reg = val; | ||
27 | } | ||
28 | |||
29 | static unsigned long rtc_reg_read(void) | ||
30 | { | ||
31 | unsigned long tmp = *ds1603->reg; | ||
32 | return tmp; | ||
33 | } | ||
34 | |||
35 | static unsigned long rtc_datareg_read(void) | ||
36 | { | ||
37 | unsigned long tmp = *ds1603->data_reg; | ||
38 | return tmp; | ||
39 | } | ||
40 | |||
41 | static void rtc_nrst_high(void) | ||
42 | { | ||
43 | rtc_reg_write(rtc_reg_read() | ds1603->rst); | ||
44 | } | ||
45 | |||
46 | static void rtc_nrst_low(void) | ||
47 | { | ||
48 | rtc_reg_write(rtc_reg_read() & ~ds1603->rst); | ||
49 | } | ||
50 | |||
51 | static void rtc_cycle_clock(unsigned long data) | ||
52 | { | ||
53 | data |= ds1603->clk; | ||
54 | rtc_reg_write(data); | ||
55 | lasat_ndelay(250); | ||
56 | if (ds1603->data_reversed) | ||
57 | data &= ~ds1603->data; | ||
58 | else | ||
59 | data |= ds1603->data; | ||
60 | data &= ~ds1603->clk; | ||
61 | rtc_reg_write(data); | ||
62 | lasat_ndelay(250 + ds1603->huge_delay); | ||
63 | } | ||
64 | |||
65 | static void rtc_write_databit(unsigned int bit) | ||
66 | { | ||
67 | unsigned long data = rtc_reg_read(); | ||
68 | if (ds1603->data_reversed) | ||
69 | bit = !bit; | ||
70 | if (bit) | ||
71 | data |= ds1603->data; | ||
72 | else | ||
73 | data &= ~ds1603->data; | ||
74 | |||
75 | rtc_reg_write(data); | ||
76 | lasat_ndelay(50 + ds1603->huge_delay); | ||
77 | rtc_cycle_clock(data); | ||
78 | } | ||
79 | |||
80 | static unsigned int rtc_read_databit(void) | ||
81 | { | ||
82 | unsigned int data; | ||
83 | |||
84 | data = (rtc_datareg_read() & (1 << ds1603->data_read_shift)) | ||
85 | >> ds1603->data_read_shift; | ||
86 | rtc_cycle_clock(rtc_reg_read()); | ||
87 | return data; | ||
88 | } | ||
89 | |||
90 | static void rtc_write_byte(unsigned int byte) | ||
91 | { | ||
92 | int i; | ||
93 | |||
94 | for (i = 0; i<=7; i++) { | ||
95 | rtc_write_databit(byte & 1L); | ||
96 | byte >>= 1; | ||
97 | } | ||
98 | } | ||
99 | |||
100 | static void rtc_write_word(unsigned long word) | ||
101 | { | ||
102 | int i; | ||
103 | |||
104 | for (i = 0; i<=31; i++) { | ||
105 | rtc_write_databit(word & 1L); | ||
106 | word >>= 1; | ||
107 | } | ||
108 | } | ||
109 | |||
110 | static unsigned long rtc_read_word(void) | ||
111 | { | ||
112 | int i; | ||
113 | unsigned long word = 0; | ||
114 | unsigned long shift = 0; | ||
115 | |||
116 | for (i = 0; i<=31; i++) { | ||
117 | word |= rtc_read_databit() << shift; | ||
118 | shift++; | ||
119 | } | ||
120 | return word; | ||
121 | } | ||
122 | |||
123 | static void rtc_init_op(void) | ||
124 | { | ||
125 | rtc_nrst_high(); | ||
126 | |||
127 | rtc_reg_write(rtc_reg_read() & ~ds1603->clk); | ||
128 | |||
129 | lasat_ndelay(50); | ||
130 | } | ||
131 | |||
132 | static void rtc_end_op(void) | ||
133 | { | ||
134 | rtc_nrst_low(); | ||
135 | lasat_ndelay(1000); | ||
136 | } | ||
137 | |||
138 | /* interface */ | ||
139 | unsigned long ds1603_read(void) | ||
140 | { | ||
141 | unsigned long word; | ||
142 | unsigned long flags; | ||
143 | |||
144 | spin_lock_irqsave(&rtc_lock, flags); | ||
145 | rtc_init_op(); | ||
146 | rtc_write_byte(READ_TIME_CMD); | ||
147 | word = rtc_read_word(); | ||
148 | rtc_end_op(); | ||
149 | spin_unlock_irqrestore(&rtc_lock, flags); | ||
150 | return word; | ||
151 | } | ||
152 | |||
153 | int ds1603_set(unsigned long time) | ||
154 | { | ||
155 | unsigned long flags; | ||
156 | |||
157 | spin_lock_irqsave(&rtc_lock, flags); | ||
158 | rtc_init_op(); | ||
159 | rtc_write_byte(SET_TIME_CMD); | ||
160 | rtc_write_word(time); | ||
161 | rtc_end_op(); | ||
162 | spin_unlock_irqrestore(&rtc_lock, flags); | ||
163 | |||
164 | return 0; | ||
165 | } | ||
166 | |||
167 | void ds1603_set_trimmer(unsigned int trimval) | ||
168 | { | ||
169 | rtc_init_op(); | ||
170 | rtc_write_byte(((trimval << TRIMMER_SHIFT) & TRIMMER_VALUE_MASK) | ||
171 | | (TRIMMER_SET_CMD)); | ||
172 | rtc_end_op(); | ||
173 | } | ||
174 | |||
175 | void ds1603_disable(void) | ||
176 | { | ||
177 | ds1603_set_trimmer(TRIMMER_DISABLE_RTC); | ||
178 | } | ||
179 | |||
180 | void ds1603_enable(void) | ||
181 | { | ||
182 | ds1603_set_trimmer(TRIMMER_DEFAULT); | ||
183 | } | ||