Hardware Design: SIE

Hardware Design: SIE Git Source Tree

1	/*
2	* JZ47xx GPIO lines
3	*
4	* Written 2010 by Andres Calderon andres.calderon@emqbit.com
5	*/
6
7	#include "jz47xx_mmap.h"
8
9	unsigned int *
10	jz_mmap (off_t address)
11	{
12	int fd;
13
14	unsigned int *pio;
15
16	if ((fd = open ("/dev/mem", O_RDWR \| O_SYNC)) == -1)
17	{
18	fprintf (stderr, "Cannot open /dev/mem.\n");
19	return 0;
20	}
21
22	pio = (unsigned int *) mmap (0, getpagesize (), PROT_READ \| PROT_WRITE, MAP_SHARED, fd, address);
23
24	if (pio == (unsigned int *) -1)
25	{
26	fprintf (stderr, "Cannot mmap.\n");
27	return 0;
28	}
29
30	return pio;
31	}
32
33	void
34	jz_cs2_init()
35	{
36	JZ_PIO *pio;
37
38	pio = jz_gpio_map (CS2_PORT);
39	jz_gpio_as_func (pio, CS2_PIN, 0);
40
41	virt_addr = (JZ_REG *) (jz_mmap(0x13010000) + 0x18);
42
43	if (*virt_addr != 0x0FFF7700)
44	{
45	*virt_addr = 0x0FFF7700;
46	printf ("ADC: Configuring CS2 8 bits and 0 WS: %08X\n", *virt_addr);
47	}
48	else
49	printf ("ADC: CS2, already configured: %08X\n", *virt_addr);
50
51	virt_addr = (JZ_REG *) jz_mmap (0x14000000);
52	}
53
54

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