path: root/arch/cris/arch-v10/kernel/io_interface_mux.c

/* IO interface mux allocator for ETRAX100LX.
 * Copyright 2004, Axis Communications AB
 * $Id: io_interface_mux.c,v 1.2 2004/12/21 12:08:38 starvik Exp $
 */


/* C.f. ETRAX100LX Designer's Reference 20.9 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>

#include <asm/arch/svinto.h>
#include <asm/io.h>
#include <asm/arch/io_interface_mux.h>


#define DBG(s)

/* Macro to access ETRAX 100 registers */
#define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
					  IO_STATE_(reg##_, field##_, _##val)

enum io_if_group {
	group_a = (1<<0),
	group_b = (1<<1),
	group_c = (1<<2),
	group_d = (1<<3),
	group_e = (1<<4),
	group_f = (1<<5)
};

struct watcher
{
	void (*notify)(const unsigned int gpio_in_available,
		       const unsigned int gpio_out_available,
		       const unsigned char pa_available,
		       const unsigned char pb_available);
	struct watcher *next;
};


struct if_group
{
	enum io_if_group        group;
	unsigned char           used;
	enum cris_io_interface  owner;
};


struct interface
{
	enum cris_io_interface   ioif;
	unsigned char            groups;
	unsigned char            used;
	char                    *owner;
	unsigned int             gpio_g_in;
	unsigned int             gpio_g_out;
	unsigned char            gpio_b;
};

static struct if_group if_groups[6] = {
	{
		.group = group_a,
		.used = 0,
	},
	{
		.group = group_b,
		.used = 0,
	},
	{
		.group = group_c,
		.used = 0,
	},
	{
		.group = group_d,
		.used = 0,
	},
	{
		.group = group_e,
		.used = 0,
	},
	{
		.group = group_f,
		.used = 0,
	}
};

/* The order in the array must match the order of enum
 * cris_io_interface in io_interface_mux.h */
static struct interface interfaces[] = {
	/* Begin Non-multiplexed interfaces */
	{
		.ioif = if_eth,
		.groups = 0,
		.gpio_g_in = 0,
		.gpio_g_out = 0,
		.gpio_b = 0
	},
	{
		.ioif = if_serial_0,
		.groups = 0,
		.gpio_g_in = 0,
		.gpio_g_out = 0,
		.gpio_b = 0
	},
	/* End Non-multiplexed interfaces */
	{
		.ioif = if_serial_1,
		.groups = group_e,
		.gpio_g_in =  0x00000000,
		.gpio_g_out = 0x00000000,
		.gpio_b = 0x00
	},
	{
		.ioif = if_serial_2,
		.groups = group_b,
		.gpio_g_in =  0x000000c0,
		.gpio_g_out = 0x000000c0,
		.gpio_b = 0x00
	},
	{
		.ioif = if_serial_3,
		.groups = group_c,
		.gpio_g_in =  0xc0000000,
		.gpio_g_out = 0xc0000000,
		.gpio_b = 0x00
	},
	{
		.ioif = if_sync_serial_1,
		.groups = group_e | group_f, /* if_sync_serial_1 and if_sync_serial_3
					       can be used simultaneously */
		.gpio_g_in =  0x00000000,
		.gpio_g_out = 0x00000000,
		.gpio_b = 0x10
	},
	{
		.ioif = if_sync_serial_3,
		.groups = group_c | group_f,
		.gpio_g_in =  0xc0000000,
		.gpio_g_out = 0xc0000000,
		.gpio_b = 0x80
	},
	{
		.ioif = if_shared_ram,
		.groups = group_a,
		.gpio_g_in =  0x0000ff3e,
		.gpio_g_out = 0x0000ff38,
		.gpio_b = 0x00
	},
	{
		.ioif = if_shared_ram_w,
		.groups = group_a | group_d,
		.gpio_g_in =  0x00ffff3e,
		.gpio_g_out = 0x00ffff38,
		.gpio_b = 0x00
	},
	{
		.ioif = if_par_0,
		.groups = group_a,
		.gpio_g_in =  0x0000ff3e,
		.gpio_g_out = 0x0000ff3e,
		.gpio_b = 0x00
	},
	{
		.ioif = if_par_1,
		.groups = group_d,
		.gpio_g_in =  0x3eff0000,
		.gpio_g_out = 0x3eff0000,
		.gpio_b = 0x00
	},
	{
		.ioif = if_par_w,
		.groups = group_a | group_d,
		.gpio_g_in =  0x00ffff3e,
		.gpio_g_out = 0x00ffff3e,
		.gpio_b = 0x00
	},
	{
		.ioif = if_scsi8_0,
		.groups = group_a | group_b | group_f, /* if_scsi8_0 and if_scsi8_1
							  can be used simultaneously */
		.gpio_g_in =  0x0000ffff,
		.gpio_g_out = 0x0000ffff,
		.gpio_b = 0x10
	},
	{
		.ioif = if_scsi8_1,
		.groups = group_c | group_d |