aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/pmc-sierra
diff options
context:
space:
mode:
authorRalf Baechle <ralf@linux-mips.org>2007-07-29 19:45:04 -0400
committerRalf Baechle <ralf@linux-mips.org>2007-07-31 16:35:31 -0400
commitdaa4a68f901c4d6491baa1a01f5c869a553c3f6c (patch)
treef83aa7de39817579b563e166fb73c4e15d853cbe /arch/mips/pmc-sierra
parent4d8506b806cc726c96db1c1a55edfb2da52217a9 (diff)
[MIPS] Yosemite: Fix warnings in i2c-yoesmite by deleting the unused code.
arch/mips/pmc-sierra/yosemite/i2c-yosemite.c: In function 'titan_i2c_xfer': arch/mips/pmc-sierra/yosemite/i2c-yosemite.c:98: warning: 'data' may be used uninitialized in this function Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/pmc-sierra')
-rw-r--r--arch/mips/pmc-sierra/yosemite/Makefile4
-rw-r--r--arch/mips/pmc-sierra/yosemite/i2c-yosemite.c188
2 files changed, 3 insertions, 189 deletions
diff --git a/arch/mips/pmc-sierra/yosemite/Makefile b/arch/mips/pmc-sierra/yosemite/Makefile
index e931e0d44229..8fd9a04e3534 100644
--- a/arch/mips/pmc-sierra/yosemite/Makefile
+++ b/arch/mips/pmc-sierra/yosemite/Makefile
@@ -2,7 +2,9 @@
2# Makefile for the PMC-Sierra Titan 2# Makefile for the PMC-Sierra Titan
3# 3#
4 4
5obj-y += irq.o i2c-yosemite.o prom.o py-console.o setup.o 5obj-y += irq.o prom.o py-console.o setup.o
6 6
7obj-$(CONFIG_KGDB) += dbg_io.o 7obj-$(CONFIG_KGDB) += dbg_io.o
8obj-$(CONFIG_SMP) += smp.o 8obj-$(CONFIG_SMP) += smp.o
9
10EXTRA_CFLAGS += -Werror
diff --git a/arch/mips/pmc-sierra/yosemite/i2c-yosemite.c b/arch/mips/pmc-sierra/yosemite/i2c-yosemite.c
deleted file mode 100644
index 85b14c73c226..000000000000
--- a/arch/mips/pmc-sierra/yosemite/i2c-yosemite.c
+++ /dev/null
@@ -1,188 +0,0 @@
1/*
2 * Copyright (C) 2003 PMC-Sierra Inc.
3 * Author: Manish Lachwani (lachwani@pmc-sierra.com)
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
13 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
14 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
15 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
16 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
17 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
18 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
19 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26/*
27 * Detailed Description:
28 *
29 * This block implements the I2C interface to the slave devices like the
30 * Atmel 24C32 EEPROM and the MAX 1619 Sensors device. The I2C Master interface
31 * can be controlled by the SCMB block. And the SCMB block kicks in only when
32 * using the Ethernet Mode of operation and __not__ the SysAD mode
33 *
34 * The SCMB controls the two modes: MDIO and the I2C. The MDIO mode is used to
35 * communicate with the Quad-PHY from Marvel. The I2C is used to communicate
36 * with the I2C slave devices. It seems that the driver does not explicitly
37 * deal with the control of SDA and SCL serial lines. So, the driver will set
38 * the slave address, drive the command and then the data. The SCMB will then
39 * control the two serial lines as required.
40 *
41 * It seems the documents are very unclear abt this. Hence, I took some time
42 * out to write the desciption to have an idea of how the I2C can actually
43 * work. Currently, this Linux driver wont be integrated into the generic Linux
44 * I2C framework. And finally, the I2C interface is also known as the 2BI
45 * interface. 2BI means 2-bit interface referring to SDA and SCL serial lines
46 * respectively.
47 *
48 * - Manish Lachwani (12/09/2003)
49 */
50
51#include "i2c-yosemite.h"
52
53/*
54 * Poll the I2C interface for the BUSY bit.
55 */
56static int titan_i2c_poll(void)
57{
58 int i = 0;
59 unsigned long val = 0;
60
61 for (i = 0; i < TITAN_I2C_MAX_POLL; i++) {
62 val = TITAN_I2C_READ(TITAN_I2C_COMMAND);
63
64 if (!(val & 0x8000))
65 return 0;
66 }
67
68 return TITAN_I2C_ERR_TIMEOUT;
69}
70
71/*
72 * Execute the I2C command
73 */
74int titan_i2c_xfer(unsigned int slave_addr, titan_i2c_command * cmd,
75 int size, unsigned int *addr)
76{
77 int loop, bytes = 0, i;
78 unsigned int *write_data, data, *read_data;
79 unsigned long reg_val, val;
80
81 write_data = cmd->data;
82 read_data = addr;
83
84 TITAN_I2C_WRITE(TITAN_I2C_SLAVE_ADDRESS, slave_addr);
85
86 if (cmd->type == TITAN_I2C_CMD_WRITE)
87 loop = cmd->write_size;
88 else
89 loop = size;
90
91 while (loop > 0) {
92 if ((cmd->type == TITAN_I2C_CMD_WRITE) ||
93 (cmd->type == TITAN_I2C_CMD_READ_WRITE)) {
94
95 reg_val = TITAN_I2C_DATA;
96 for (i = 0; i < TITAN_I2C_MAX_WORDS_PER_RW;
97 ++i, write_data += 2, reg_val += 4) {
98 if (bytes < cmd->write_size) {
99 data = write_data[0];
100 ++data;
101 }
102
103 if (bytes < cmd->write_size) {
104 data = write_data[1];
105 ++data;
106 }
107
108 TITAN_I2C_WRITE(reg_val, data);
109 }
110 }
111
112 TITAN_I2C_WRITE(TITAN_I2C_COMMAND,
113 (unsigned int) (cmd->type << 13));
114 if (titan_i2c_poll() != TITAN_I2C_ERR_OK)
115 return TITAN_I2C_ERR_TIMEOUT;
116
117 if ((cmd->type == TITAN_I2C_CMD_READ) ||
118 (cmd->type == TITAN_I2C_CMD_READ_WRITE)) {
119
120 reg_val = TITAN_I2C_DATA;
121 for (i = 0; i < TITAN_I2C_MAX_WORDS_PER_RW;
122 ++i, read_data += 2, reg_val += 4) {
123 data = TITAN_I2C_READ(reg_val);
124
125 if (bytes < size) {
126 read_data[0] = data & 0xff;
127 ++bytes;
128 }
129
130 if (bytes < size) {
131 read_data[1] =
132 ((data >> 8) & 0xff);
133 ++bytes;
134 }
135 }
136 }
137
138 loop -= (TITAN_I2C_MAX_WORDS_PER_RW * 2);
139 }
140
141 /*
142 * Read the Interrupt status and then return the appropriate error code
143 */
144
145 val = TITAN_I2C_READ(TITAN_I2C_INTERRUPTS);
146 if (val & 0x0020)
147 return TITAN_I2C_ERR_ARB_LOST;
148
149 if (val & 0x0040)
150 return TITAN_I2C_ERR_NO_RESP;
151
152 if (val & 0x0080)
153 return TITAN_I2C_ERR_DATA_COLLISION;
154
155 return TITAN_I2C_ERR_OK;
156}
157
158/*
159 * Init the I2C subsystem of the PMC-Sierra Yosemite board
160 */
161int titan_i2c_init(titan_i2c_config * config)
162{
163 unsigned int val;
164
165 /*
166 * Reset the SCMB and program into the I2C mode
167 */
168 TITAN_I2C_WRITE(TITAN_I2C_SCMB_CONTROL, 0xA000);
169 TITAN_I2C_WRITE(TITAN_I2C_SCMB_CONTROL, 0x2000);
170
171 /*
172 * Configure the filtera and clka values
173 */
174 val = TITAN_I2C_READ(TITAN_I2C_SCMB_CLOCK_A);
175 val |= ((val & ~(0xF000)) | ((config->filtera << 12) & 0xF000));
176 val |= ((val & ~(0x03FF)) | (config->clka & 0x03FF));
177 TITAN_I2C_WRITE(TITAN_I2C_SCMB_CLOCK_A, val);
178
179 /*
180 * Configure the filterb and clkb values
181 */
182 val = TITAN_I2C_READ(TITAN_I2C_SCMB_CLOCK_B);
183 val |= ((val & ~(0xF000)) | ((config->filterb << 12) & 0xF000));
184 val |= ((val & ~(0x03FF)) | (config->clkb & 0x03FF));
185 TITAN_I2C_WRITE(TITAN_I2C_SCMB_CLOCK_B, val);
186
187 return TITAN_I2C_ERR_OK;
188}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 02:19:19 -0500