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author | Barry Wardell <rockbox@barrywardell.net> | 2007-01-27 14:22:24 +0000 |
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committer | Barry Wardell <rockbox@barrywardell.net> | 2007-01-27 14:22:24 +0000 |
commit | 5e765b2ea2962b86c460a67968d4977f3aa55ca3 (patch) | |
tree | e66a22992e7d17c6856cff560cf70fd6a0e378b4 /firmware/target/arm | |
parent | 6820ed1f7f13347c8134b4678ce6c4d403482681 (diff) | |
download | rockbox-5e765b2ea2962b86c460a67968d4977f3aa55ca3.tar.gz rockbox-5e765b2ea2962b86c460a67968d4977f3aa55ca3.zip |
Clean up PP5020 I2C code (no functional changes):
Move into target tree.
Use #defines instead of inb/outb.
Whitespace cleanup.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12123 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm')
-rw-r--r-- | firmware/target/arm/i2c-pp5020.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/firmware/target/arm/i2c-pp5020.c b/firmware/target/arm/i2c-pp5020.c new file mode 100644 index 0000000000..95a677ea01 --- /dev/null +++ b/firmware/target/arm/i2c-pp5020.c | |||
@@ -0,0 +1,198 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * PP5020 I2C driver | ||
11 | * | ||
12 | * Based on code from the ipodlinux project - http://ipodlinux.org/ | ||
13 | * Adapted for Rockbox in November 2005 | ||
14 | * | ||
15 | * Original file: linux/arch/armnommu/mach-ipod/hardware.c | ||
16 | * | ||
17 | * Copyright (c) 2003-2005 Bernard Leach (leachbj@bouncycastle.org) | ||
18 | * | ||
19 | * All files in this archive are subject to the GNU General Public License. | ||
20 | * See the file COPYING in the source tree root for full license agreement. | ||
21 | * | ||
22 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
23 | * KIND, either express or implied. | ||
24 | * | ||
25 | ****************************************************************************/ | ||
26 | |||
27 | #include "cpu.h" | ||
28 | #include "kernel.h" | ||
29 | #include "logf.h" | ||
30 | #include "system.h" | ||
31 | #include "i2c-pp5020.h" | ||
32 | |||
33 | /* Local functions definitions */ | ||
34 | |||
35 | #define POLL_TIMEOUT (HZ) | ||
36 | |||
37 | static int pp_i2c_wait_not_busy(void) | ||
38 | { | ||
39 | unsigned long timeout; | ||
40 | timeout = current_tick + POLL_TIMEOUT; | ||
41 | while (TIME_BEFORE(current_tick, timeout)) { | ||
42 | if (!(I2C_STATUS & I2C_BUSY)) { | ||
43 | return 0; | ||
44 | } | ||
45 | yield(); | ||
46 | } | ||
47 | |||
48 | return -1; | ||
49 | } | ||
50 | |||
51 | static int pp_i2c_read_byte(unsigned int addr, unsigned int *data) | ||
52 | { | ||
53 | if (pp_i2c_wait_not_busy() < 0) | ||
54 | { | ||
55 | return -1; | ||
56 | } | ||
57 | |||
58 | { | ||
59 | unsigned int byte; | ||
60 | int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL); | ||
61 | |||
62 | /* clear top 15 bits, left shift 1, or in 0x1 for a read */ | ||
63 | I2C_ADDR = ((addr << 17) >> 16) | 0x1 ; | ||
64 | |||
65 | I2C_CTRL |= 0x20; | ||
66 | |||
67 | I2C_CTRL |= I2C_SEND; | ||
68 | |||
69 | set_irq_level(old_irq_level); | ||
70 | if (pp_i2c_wait_not_busy() < 0) | ||
71 | { | ||
72 | return -1; | ||
73 | } | ||
74 | old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL); | ||
75 | |||
76 | byte = I2C_DATA(0); | ||
77 | |||
78 | if (data) | ||
79 | *data = byte; | ||
80 | |||
81 | set_irq_level(old_irq_level); | ||
82 | } | ||
83 | |||
84 | return 0; | ||
85 | } | ||
86 | |||
87 | static int pp_i2c_send_bytes(unsigned int addr, unsigned int len, unsigned char *data) | ||
88 | { | ||
89 | unsigned int i; | ||
90 | |||
91 | if (len < 1 || len > 4) | ||
92 | { | ||
93 | return -1; | ||
94 | } | ||
95 | |||
96 | if (pp_i2c_wait_not_busy() < 0) | ||
97 | { | ||
98 | return -2; | ||
99 | } | ||
100 | |||
101 | { | ||
102 | int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL); | ||
103 | |||
104 | /* clear top 15 bits, left shift 1 */ | ||
105 | I2C_ADDR = (addr << 17) >> 16; | ||
106 | |||
107 | I2C_CTRL &= ~0x20; | ||
108 | |||
109 | for ( i = 0; i < len; i++ ) | ||
110 | { | ||
111 | I2C_DATA(i) = *data++; | ||
112 | } | ||
113 | |||
114 | I2C_CTRL = (I2C_CTRL & ~0x26) | ((len-1) << 1); | ||
115 | |||
116 | I2C_CTRL |= I2C_SEND; | ||
117 | |||
118 | set_irq_level(old_irq_level); | ||
119 | } | ||
120 | |||
121 | return 0x0; | ||
122 | } | ||
123 | |||
124 | static int pp_i2c_send_byte(unsigned int addr, int data0) | ||
125 | { | ||
126 | unsigned char data[1]; | ||
127 | |||
128 | data[0] = data0; | ||
129 | |||
130 | return pp_i2c_send_bytes(addr, 1, data); | ||
131 | } | ||
132 | |||
133 | /* Public functions */ | ||
134 | static struct mutex i2c_mutex; | ||
135 | |||
136 | int i2c_readbytes(unsigned int dev_addr, int addr, int len, unsigned char *data) { | ||
137 | unsigned int temp; | ||
138 | int i; | ||
139 | mutex_lock(&i2c_mutex); | ||
140 | pp_i2c_send_byte(dev_addr, addr); | ||
141 | for (i = 0; i < len; i++) { | ||
142 | pp_i2c_read_byte(dev_addr, &temp); | ||
143 | data[i] = temp; | ||
144 | } | ||
145 | mutex_unlock(&i2c_mutex); | ||
146 | return i; | ||
147 | } | ||
148 | |||
149 | int i2c_readbyte(unsigned int dev_addr, int addr) | ||
150 | { | ||
151 | int data; | ||
152 | |||
153 | mutex_lock(&i2c_mutex); | ||
154 | pp_i2c_send_byte(dev_addr, addr); | ||
155 | pp_i2c_read_byte(dev_addr, &data); | ||
156 | mutex_unlock(&i2c_mutex); | ||
157 | |||
158 | return data; | ||
159 | } | ||
160 | |||
161 | int pp_i2c_send(unsigned int addr, int data0, int data1) | ||
162 | { | ||
163 | int retval; | ||
164 | unsigned char data[2]; | ||
165 | |||
166 | data[0] = data0; | ||
167 | data[1] = data1; | ||
168 | |||
169 | mutex_lock(&i2c_mutex); | ||
170 | retval = pp_i2c_send_bytes(addr, 2, data); | ||
171 | mutex_unlock(&i2c_mutex); | ||
172 | |||
173 | return retval; | ||
174 | } | ||
175 | |||
176 | void i2c_init(void) | ||
177 | { | ||
178 | /* From ipodlinux */ | ||
179 | |||
180 | #ifdef IPOD_MINI | ||
181 | /* GPIO port C disable port 0x10 */ | ||
182 | GPIOC_ENABLE &= ~0x10; | ||
183 | |||
184 | /* GPIO port C disable port 0x20 */ | ||
185 | GPIOC_ENABLE &= ~0x20; | ||
186 | #endif | ||
187 | |||
188 | DEV_EN |= DEV_I2C; | ||
189 | DEV_RS |= DEV_I2C; | ||
190 | DEV_RS &=~DEV_I2C; | ||
191 | |||
192 | outl(0x0, 0x600060a4); | ||
193 | outl(0x80 | (0 << 8), 0x600060a4); | ||
194 | |||
195 | mutex_init(&i2c_mutex); | ||
196 | |||
197 | i2c_readbyte(0x8, 0); | ||
198 | } | ||