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 *********************/
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 
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 
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