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author | Daniel Ankers <dan@weirdo.org.uk> | 2007-01-27 17:17:52 +0000 |
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committer | Daniel Ankers <dan@weirdo.org.uk> | 2007-01-27 17:17:52 +0000 |
commit | e9a2caee2bbd363058ed707acbe2df613c94c0e8 (patch) | |
tree | ff5618e2af879ddd588d90251130a172b373f879 /firmware/target/arm/i2c-pp.c | |
parent | 369b6bd367d96e0c4a13c1f8c14830091737e84f (diff) | |
download | rockbox-e9a2caee2bbd363058ed707acbe2df613c94c0e8.tar.gz rockbox-e9a2caee2bbd363058ed707acbe2df613c94c0e8.zip |
Unify I2C driver for all PortalPlayer targets
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12126 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm/i2c-pp.c')
-rw-r--r-- | firmware/target/arm/i2c-pp.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/firmware/target/arm/i2c-pp.c b/firmware/target/arm/i2c-pp.c new file mode 100644 index 0000000000..0c8aec8f4b --- /dev/null +++ b/firmware/target/arm/i2c-pp.c | |||
@@ -0,0 +1,208 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * PP502X and PP5002 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 | #if CONFIG_I2C == I2C_PP5002 | ||
32 | #include "i2c-pp5002.h" | ||
33 | #else | ||
34 | #include "i2c-pp5020.h" | ||
35 | #endif | ||
36 | |||
37 | /* Local functions definitions */ | ||
38 | |||
39 | #define POLL_TIMEOUT (HZ) | ||
40 | |||
41 | static int pp_i2c_wait_not_busy(void) | ||
42 | { | ||
43 | unsigned long timeout; | ||
44 | timeout = current_tick + POLL_TIMEOUT; | ||
45 | while (TIME_BEFORE(current_tick, timeout)) { | ||
46 | if (!(I2C_STATUS & I2C_BUSY)) { | ||
47 | return 0; | ||
48 | } | ||
49 | yield(); | ||
50 | } | ||
51 | |||
52 | return -1; | ||
53 | } | ||
54 | |||
55 | static int pp_i2c_read_byte(unsigned int addr, unsigned int *data) | ||
56 | { | ||
57 | if (pp_i2c_wait_not_busy() < 0) | ||
58 | { | ||
59 | return -1; | ||
60 | } | ||
61 | |||
62 | { | ||
63 | unsigned int byte; | ||
64 | int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL); | ||
65 | |||
66 | /* clear top 15 bits, left shift 1, or in 0x1 for a read */ | ||
67 | I2C_ADDR = ((addr << 17) >> 16) | 0x1 ; | ||
68 | |||
69 | I2C_CTRL |= 0x20; | ||
70 | |||
71 | I2C_CTRL |= I2C_SEND; | ||
72 | |||
73 | set_irq_level(old_irq_level); | ||
74 | if (pp_i2c_wait_not_busy() < 0) | ||
75 | { | ||
76 | return -1; | ||
77 | } | ||
78 | old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL); | ||
79 | |||
80 | byte = I2C_DATA(0); | ||
81 | |||
82 | if (data) | ||
83 | *data = byte; | ||
84 | |||
85 | set_irq_level(old_irq_level); | ||
86 | } | ||
87 | |||
88 | return 0; | ||
89 | } | ||
90 | |||
91 | static int pp_i2c_send_bytes(unsigned int addr, unsigned int len, unsigned char *data) | ||
92 | { | ||
93 | unsigned int i; | ||
94 | |||
95 | if (len < 1 || len > 4) | ||
96 | { | ||
97 | return -1; | ||
98 | } | ||
99 | |||
100 | if (pp_i2c_wait_not_busy() < 0) | ||
101 | { | ||
102 | return -2; | ||
103 | } | ||
104 | |||
105 | { | ||
106 | int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL); | ||
107 | |||
108 | /* clear top 15 bits, left shift 1 */ | ||
109 | I2C_ADDR = (addr << 17) >> 16; | ||
110 | |||
111 | I2C_CTRL &= ~0x20; | ||
112 | |||
113 | for ( i = 0; i < len; i++ ) | ||
114 | { | ||
115 | I2C_DATA(i) = *data++; | ||
116 | } | ||
117 | |||
118 | I2C_CTRL = (I2C_CTRL & ~0x26) | ((len-1) << 1); | ||
119 | |||
120 | I2C_CTRL |= I2C_SEND; | ||
121 | |||
122 | set_irq_level(old_irq_level); | ||
123 | } | ||
124 | |||
125 | return 0x0; | ||
126 | } | ||
127 | |||
128 | static int pp_i2c_send_byte(unsigned int addr, int data0) | ||
129 | { | ||
130 | unsigned char data[1]; | ||
131 | |||
132 | data[0] = data0; | ||
133 | |||
134 | return pp_i2c_send_bytes(addr, 1, data); | ||
135 | } | ||
136 | |||
137 | /* Public functions */ | ||
138 | static struct mutex i2c_mutex; | ||
139 | |||
140 | int i2c_readbytes(unsigned int dev_addr, int addr, int len, unsigned char *data) { | ||
141 | unsigned int temp; | ||
142 | int i; | ||
143 | mutex_lock(&i2c_mutex); | ||
144 | pp_i2c_send_byte(dev_addr, addr); | ||
145 | for (i = 0; i < len; i++) { | ||
146 | pp_i2c_read_byte(dev_addr, &temp); | ||
147 | data[i] = temp; | ||
148 | } | ||
149 | mutex_unlock(&i2c_mutex); | ||
150 | return i; | ||
151 | } | ||
152 | |||
153 | int i2c_readbyte(unsigned int dev_addr, int addr) | ||
154 | { | ||
155 | int data; | ||
156 | |||
157 | mutex_lock(&i2c_mutex); | ||
158 | pp_i2c_send_byte(dev_addr, addr); | ||
159 | pp_i2c_read_byte(dev_addr, &data); | ||
160 | mutex_unlock(&i2c_mutex); | ||
161 | |||
162 | return data; | ||
163 | } | ||
164 | |||
165 | int pp_i2c_send(unsigned int addr, int data0, int data1) | ||
166 | { | ||
167 | int retval; | ||
168 | unsigned char data[2]; | ||
169 | |||
170 | data[0] = data0; | ||
171 | data[1] = data1; | ||
172 | |||
173 | mutex_lock(&i2c_mutex); | ||
174 | retval = pp_i2c_send_bytes(addr, 2, data); | ||
175 | mutex_unlock(&i2c_mutex); | ||
176 | |||
177 | return retval; | ||
178 | } | ||
179 | |||
180 | void i2c_init(void) | ||
181 | { | ||
182 | /* From ipodlinux */ | ||
183 | |||
184 | #ifdef IPOD_MINI | ||
185 | /* GPIO port C disable port 0x10 */ | ||
186 | GPIOC_ENABLE &= ~0x10; | ||
187 | |||
188 | /* GPIO port C disable port 0x20 */ | ||
189 | GPIOC_ENABLE &= ~0x20; | ||
190 | #endif | ||
191 | |||
192 | #if CONFIG_I2C == I2C_PP5002 | ||
193 | DEV_EN |= 0x2; | ||
194 | #else | ||
195 | DEV_EN |= DEV_I2C; /* Enable I2C */ | ||
196 | #endif | ||
197 | DEV_RS |= DEV_I2C; /* Start I2C Reset */ | ||
198 | DEV_RS &=~DEV_I2C; /* End I2C Reset */ | ||
199 | |||
200 | #if CONFIG_I2C == I2C_PP5020 | ||
201 | outl(0x0, 0x600060a4); | ||
202 | outl(0x80 | (0 << 8), 0x600060a4); | ||
203 | #endif | ||
204 | |||
205 | mutex_init(&i2c_mutex); | ||
206 | |||
207 | i2c_readbyte(0x8, 0); | ||
208 | } | ||