diff options
Diffstat (limited to 'arch/mips/lasat/at93c.c')
-rw-r--r-- | arch/mips/lasat/at93c.c | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/arch/mips/lasat/at93c.c b/arch/mips/lasat/at93c.c deleted file mode 100644 index ca26e554615e..000000000000 --- a/arch/mips/lasat/at93c.c +++ /dev/null | |||
@@ -1,148 +0,0 @@ | |||
1 | /* | ||
2 | * Atmel AT93C46 serial eeprom driver | ||
3 | * | ||
4 | * Brian Murphy <brian.murphy@eicon.com> | ||
5 | * | ||
6 | */ | ||
7 | #include <linux/kernel.h> | ||
8 | #include <linux/delay.h> | ||
9 | #include <asm/lasat/lasat.h> | ||
10 | #include <linux/module.h> | ||
11 | #include <linux/init.h> | ||
12 | |||
13 | #include "at93c.h" | ||
14 | |||
15 | #define AT93C_ADDR_SHIFT 7 | ||
16 | #define AT93C_ADDR_MAX ((1 << AT93C_ADDR_SHIFT) - 1) | ||
17 | #define AT93C_RCMD (0x6 << AT93C_ADDR_SHIFT) | ||
18 | #define AT93C_WCMD (0x5 << AT93C_ADDR_SHIFT) | ||
19 | #define AT93C_WENCMD 0x260 | ||
20 | #define AT93C_WDSCMD 0x200 | ||
21 | |||
22 | struct at93c_defs *at93c; | ||
23 | |||
24 | static void at93c_reg_write(u32 val) | ||
25 | { | ||
26 | *at93c->reg = val; | ||
27 | } | ||
28 | |||
29 | static u32 at93c_reg_read(void) | ||
30 | { | ||
31 | u32 tmp = *at93c->reg; | ||
32 | return tmp; | ||
33 | } | ||
34 | |||
35 | static u32 at93c_datareg_read(void) | ||
36 | { | ||
37 | u32 tmp = *at93c->rdata_reg; | ||
38 | return tmp; | ||
39 | } | ||
40 | |||
41 | static void at93c_cycle_clk(u32 data) | ||
42 | { | ||
43 | at93c_reg_write(data | at93c->clk); | ||
44 | lasat_ndelay(250); | ||
45 | at93c_reg_write(data & ~at93c->clk); | ||
46 | lasat_ndelay(250); | ||
47 | } | ||
48 | |||
49 | static void at93c_write_databit(u8 bit) | ||
50 | { | ||
51 | u32 data = at93c_reg_read(); | ||
52 | if (bit) | ||
53 | data |= 1 << at93c->wdata_shift; | ||
54 | else | ||
55 | data &= ~(1 << at93c->wdata_shift); | ||
56 | |||
57 | at93c_reg_write(data); | ||
58 | lasat_ndelay(100); | ||
59 | at93c_cycle_clk(data); | ||
60 | } | ||
61 | |||
62 | static unsigned int at93c_read_databit(void) | ||
63 | { | ||
64 | u32 data; | ||
65 | |||
66 | at93c_cycle_clk(at93c_reg_read()); | ||
67 | data = (at93c_datareg_read() >> at93c->rdata_shift) & 1; | ||
68 | return data; | ||
69 | } | ||
70 | |||
71 | static u8 at93c_read_byte(void) | ||
72 | { | ||
73 | int i; | ||
74 | u8 data = 0; | ||
75 | |||
76 | for (i = 0; i<=7; i++) { | ||
77 | data <<= 1; | ||
78 | data |= at93c_read_databit(); | ||
79 | } | ||
80 | return data; | ||
81 | } | ||
82 | |||
83 | static void at93c_write_bits(u32 data, int size) | ||
84 | { | ||
85 | int i; | ||
86 | int shift = size - 1; | ||
87 | u32 mask = (1 << shift); | ||
88 | |||
89 | for (i = 0; i < size; i++) { | ||
90 | at93c_write_databit((data & mask) >> shift); | ||
91 | data <<= 1; | ||
92 | } | ||
93 | } | ||
94 | |||
95 | static void at93c_init_op(void) | ||
96 | { | ||
97 | at93c_reg_write((at93c_reg_read() | at93c->cs) & ~at93c->clk & ~(1 << at93c->rdata_shift)); | ||
98 | lasat_ndelay(50); | ||
99 | } | ||
100 | |||
101 | static void at93c_end_op(void) | ||
102 | { | ||
103 | at93c_reg_write(at93c_reg_read() & ~at93c->cs); | ||
104 | lasat_ndelay(250); | ||
105 | } | ||
106 | |||
107 | static void at93c_wait(void) | ||
108 | { | ||
109 | at93c_init_op(); | ||
110 | while (!at93c_read_databit()) | ||
111 | ; | ||
112 | at93c_end_op(); | ||
113 | }; | ||
114 | |||
115 | static void at93c_disable_wp(void) | ||
116 | { | ||
117 | at93c_init_op(); | ||
118 | at93c_write_bits(AT93C_WENCMD, 10); | ||
119 | at93c_end_op(); | ||
120 | } | ||
121 | |||
122 | static void at93c_enable_wp(void) | ||
123 | { | ||
124 | at93c_init_op(); | ||
125 | at93c_write_bits(AT93C_WDSCMD, 10); | ||
126 | at93c_end_op(); | ||
127 | } | ||
128 | |||
129 | u8 at93c_read(u8 addr) | ||
130 | { | ||
131 | u8 byte; | ||
132 | at93c_init_op(); | ||
133 | at93c_write_bits((addr & AT93C_ADDR_MAX)|AT93C_RCMD, 10); | ||
134 | byte = at93c_read_byte(); | ||
135 | at93c_end_op(); | ||
136 | return byte; | ||
137 | } | ||
138 | |||
139 | void at93c_write(u8 addr, u8 data) | ||
140 | { | ||
141 | at93c_disable_wp(); | ||
142 | at93c_init_op(); | ||
143 | at93c_write_bits((addr & AT93C_ADDR_MAX)|AT93C_WCMD, 10); | ||
144 | at93c_write_bits(data, 8); | ||
145 | at93c_end_op(); | ||
146 | at93c_wait(); | ||
147 | at93c_enable_wp(); | ||
148 | } | ||