2 * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
3 * Copyright (c) 2016 Vadim Pasternak <vadimp@mellanox.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the names of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
17 * Alternatively, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2 as published by the Free
19 * Software Foundation.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
34 #include <linux/device.h>
35 #include <linux/dmi.h>
36 #include <linux/i2c.h>
37 #include <linux/i2c-mux.h>
38 #include <linux/module.h>
39 #include <linux/platform_device.h>
40 #include <linux/platform_data/i2c-mux-reg.h>
42 #define MLX_PLAT_DEVICE_NAME "mlxplat"
44 /* LPC bus IO offsets */
45 #define MLXPLAT_CPLD_LPC_I2C_BASE_ADRR 0x2000
46 #define MLXPLAT_CPLD_LPC_REG_BASE_ADRR 0x2500
47 #define MLXPLAT_CPLD_LPC_IO_RANGE 0x100
48 #define MLXPLAT_CPLD_LPC_I2C_CH1_OFF 0xdb
49 #define MLXPLAT_CPLD_LPC_I2C_CH2_OFF 0xda
50 #define MLXPLAT_CPLD_LPC_PIO_OFFSET 0x10000UL
51 #define MLXPLAT_CPLD_LPC_REG1 ((MLXPLAT_CPLD_LPC_REG_BASE_ADRR + \
52 MLXPLAT_CPLD_LPC_I2C_CH1_OFF) | \
53 MLXPLAT_CPLD_LPC_PIO_OFFSET)
54 #define MLXPLAT_CPLD_LPC_REG2 ((MLXPLAT_CPLD_LPC_REG_BASE_ADRR + \
55 MLXPLAT_CPLD_LPC_I2C_CH2_OFF) | \
56 MLXPLAT_CPLD_LPC_PIO_OFFSET)
58 /* Start channel numbers */
59 #define MLXPLAT_CPLD_CH1 2
60 #define MLXPLAT_CPLD_CH2 10
62 /* Number of LPC attached MUX platform devices */
63 #define MLXPLAT_CPLD_LPC_MUX_DEVS 2
65 /* mlxplat_priv - platform private data
66 * @pdev_i2c - i2c controller platform device
67 * @pdev_mux - array of mux platform devices
70 struct platform_device *pdev_i2c;
71 struct platform_device *pdev_mux[MLXPLAT_CPLD_LPC_MUX_DEVS];
74 /* Regions for LPC I2C controller and LPC base register space */
75 static const struct resource mlxplat_lpc_resources[] = {
76 [0] = DEFINE_RES_NAMED(MLXPLAT_CPLD_LPC_I2C_BASE_ADRR,
77 MLXPLAT_CPLD_LPC_IO_RANGE,
78 "mlxplat_cpld_lpc_i2c_ctrl", IORESOURCE_IO),
79 [1] = DEFINE_RES_NAMED(MLXPLAT_CPLD_LPC_REG_BASE_ADRR,
80 MLXPLAT_CPLD_LPC_IO_RANGE,
81 "mlxplat_cpld_lpc_regs",
85 /* Platform default channels */
86 static const int mlxplat_default_channels[][8] = {
88 MLXPLAT_CPLD_CH1, MLXPLAT_CPLD_CH1 + 1, MLXPLAT_CPLD_CH1 + 2,
89 MLXPLAT_CPLD_CH1 + 3, MLXPLAT_CPLD_CH1 + 4, MLXPLAT_CPLD_CH1 +
90 5, MLXPLAT_CPLD_CH1 + 6, MLXPLAT_CPLD_CH1 + 7
93 MLXPLAT_CPLD_CH2, MLXPLAT_CPLD_CH2 + 1, MLXPLAT_CPLD_CH2 + 2,
94 MLXPLAT_CPLD_CH2 + 3, MLXPLAT_CPLD_CH2 + 4, MLXPLAT_CPLD_CH2 +
95 5, MLXPLAT_CPLD_CH2 + 6, MLXPLAT_CPLD_CH2 + 7
99 /* Platform channels for MSN21xx system family */
100 static const int mlxplat_msn21xx_channels[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
102 /* Platform mux data */
103 static struct i2c_mux_reg_platform_data mlxplat_mux_data[] = {
106 .base_nr = MLXPLAT_CPLD_CH1,
108 .reg = (void __iomem *)MLXPLAT_CPLD_LPC_REG1,
114 .base_nr = MLXPLAT_CPLD_CH2,
116 .reg = (void __iomem *)MLXPLAT_CPLD_LPC_REG2,
123 static struct platform_device *mlxplat_dev;
125 static int __init mlxplat_dmi_default_matched(const struct dmi_system_id *dmi)
129 for (i = 0; i < ARRAY_SIZE(mlxplat_mux_data); i++) {
130 mlxplat_mux_data[i].values = mlxplat_default_channels[i];
131 mlxplat_mux_data[i].n_values =
132 ARRAY_SIZE(mlxplat_default_channels[i]);
138 static int __init mlxplat_dmi_msn21xx_matched(const struct dmi_system_id *dmi)
142 for (i = 0; i < ARRAY_SIZE(mlxplat_mux_data); i++) {
143 mlxplat_mux_data[i].values = mlxplat_msn21xx_channels;
144 mlxplat_mux_data[i].n_values =
145 ARRAY_SIZE(mlxplat_msn21xx_channels);
151 static struct dmi_system_id mlxplat_dmi_table[] __initdata = {
153 .callback = mlxplat_dmi_default_matched,
155 DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
156 DMI_MATCH(DMI_PRODUCT_NAME, "MSN24"),
160 .callback = mlxplat_dmi_default_matched,
162 DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
163 DMI_MATCH(DMI_PRODUCT_NAME, "MSN27"),
167 .callback = mlxplat_dmi_default_matched,
169 DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
170 DMI_MATCH(DMI_PRODUCT_NAME, "MSB"),
174 .callback = mlxplat_dmi_default_matched,
176 DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
177 DMI_MATCH(DMI_PRODUCT_NAME, "MSX"),
181 .callback = mlxplat_dmi_msn21xx_matched,
183 DMI_MATCH(DMI_BOARD_VENDOR, "Mellanox Technologies"),
184 DMI_MATCH(DMI_PRODUCT_NAME, "MSN21"),
190 static int __init mlxplat_init(void)
192 struct mlxplat_priv *priv;
195 if (!dmi_check_system(mlxplat_dmi_table))
198 mlxplat_dev = platform_device_register_simple(MLX_PLAT_DEVICE_NAME, -1,
199 mlxplat_lpc_resources,
200 ARRAY_SIZE(mlxplat_lpc_resources));
202 if (IS_ERR(mlxplat_dev))
203 return PTR_ERR(mlxplat_dev);
205 priv = devm_kzalloc(&mlxplat_dev->dev, sizeof(struct mlxplat_priv),
211 platform_set_drvdata(mlxplat_dev, priv);
213 priv->pdev_i2c = platform_device_register_simple("i2c_mlxcpld", -1,
215 if (IS_ERR(priv->pdev_i2c)) {
216 err = PTR_ERR(priv->pdev_i2c);
220 for (i = 0; i < ARRAY_SIZE(mlxplat_mux_data); i++) {
221 priv->pdev_mux[i] = platform_device_register_resndata(
223 "i2c-mux-reg", i, NULL,
224 0, &mlxplat_mux_data[i],
225 sizeof(mlxplat_mux_data[i]));
226 if (IS_ERR(priv->pdev_mux[i])) {
227 err = PTR_ERR(priv->pdev_mux[i]);
228 goto fail_platform_mux_register;
234 fail_platform_mux_register:
235 for (i--; i > 0 ; i--)
236 platform_device_unregister(priv->pdev_mux[i]);
237 platform_device_unregister(priv->pdev_i2c);
239 platform_device_unregister(mlxplat_dev);
243 module_init(mlxplat_init);
245 static void __exit mlxplat_exit(void)
247 struct mlxplat_priv *priv = platform_get_drvdata(mlxplat_dev);
250 for (i = ARRAY_SIZE(mlxplat_mux_data) - 1; i >= 0 ; i--)
251 platform_device_unregister(priv->pdev_mux[i]);
253 platform_device_unregister(priv->pdev_i2c);
254 platform_device_unregister(mlxplat_dev);
256 module_exit(mlxplat_exit);
258 MODULE_AUTHOR("Vadim Pasternak (vadimp@mellanox.com)");
259 MODULE_DESCRIPTION("Mellanox platform driver");
260 MODULE_LICENSE("Dual BSD/GPL");
261 MODULE_ALIAS("dmi:*:*Mellanox*:MSN24*:");
262 MODULE_ALIAS("dmi:*:*Mellanox*:MSN27*:");
263 MODULE_ALIAS("dmi:*:*Mellanox*:MSB*:");
264 MODULE_ALIAS("dmi:*:*Mellanox*:MSX*:");
265 MODULE_ALIAS("dmi:*:*Mellanox*:MSN21*:");