1 /*
2 * Driver for the Conexant CX25821 PCIe bridge
3 *
4 * Copyright (C) 2009 Conexant Systems Inc.
5 * Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 *
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include "cx25821.h"
24
25 /********************* GPIO stuffs *********************/
cx25821_set_gpiopin_direction(struct cx25821_dev * dev,int pin_number,int pin_logic_value)26 void cx25821_set_gpiopin_direction(struct cx25821_dev *dev,
27 int pin_number, int pin_logic_value)
28 {
29 int bit = pin_number;
30 u32 gpio_oe_reg = GPIO_LO_OE;
31 u32 gpio_register = 0;
32 u32 value = 0;
33
34 /* Check for valid pinNumber */
35 if (pin_number >= 47)
36 return;
37
38 if (pin_number > 31) {
39 bit = pin_number - 31;
40 gpio_oe_reg = GPIO_HI_OE;
41 }
42 /* Here we will make sure that the GPIOs 0 and 1 are output. keep the
43 * rest as is */
44 gpio_register = cx_read(gpio_oe_reg);
45
46 if (pin_logic_value == 1)
47 value = gpio_register | Set_GPIO_Bit(bit);
48 else
49 value = gpio_register & Clear_GPIO_Bit(bit);
50
51 cx_write(gpio_oe_reg, value);
52 }
53 EXPORT_SYMBOL(cx25821_set_gpiopin_direction);
54
cx25821_set_gpiopin_logicvalue(struct cx25821_dev * dev,int pin_number,int pin_logic_value)55 static void cx25821_set_gpiopin_logicvalue(struct cx25821_dev *dev,
56 int pin_number, int pin_logic_value)
57 {
58 int bit = pin_number;
59 u32 gpio_reg = GPIO_LO;
60 u32 value = 0;
61
62 /* Check for valid pinNumber */
63 if (pin_number >= 47)
64 return;
65
66 /* change to output direction */
67 cx25821_set_gpiopin_direction(dev, pin_number, 0);
68
69 if (pin_number > 31) {
70 bit = pin_number - 31;
71 gpio_reg = GPIO_HI;
72 }
73
74 value = cx_read(gpio_reg);
75
76 if (pin_logic_value == 0)
77 value &= Clear_GPIO_Bit(bit);
78 else
79 value |= Set_GPIO_Bit(bit);
80
81 cx_write(gpio_reg, value);
82 }
83
cx25821_gpio_init(struct cx25821_dev * dev)84 void cx25821_gpio_init(struct cx25821_dev *dev)
85 {
86 if (dev == NULL)
87 return;
88
89 switch (dev->board) {
90 case CX25821_BOARD_CONEXANT_ATHENA10:
91 default:
92 /* set GPIO 5 to select the path for Medusa/Athena */
93 cx25821_set_gpiopin_logicvalue(dev, 5, 1);
94 mdelay(20);
95 break;
96 }
97
98 }
99