Commit aa42cb71 authored by Shaveta Leekha's avatar Shaveta Leekha Committed by Andy Fleming

board/freescale/common: VSC3316/VSC3308 initialization code

Add code for configuring VSC3316/3308 crosspoint switches
Add README to understand the APIs

   - VSC 3316/3308 is a low-power, low-cost asynchronous crosspoint switch
     capable of data rates upto 11.5Gbps. VSC3316 has 16 input and 16
     output ports whereas VSC3308 has 8 input and 8 output ports.
     Programming of these devices are performed by two-wire or four-wire
     serial interface.
Signed-off-by: default avatarShaveta Leekha <shaveta@freescale.com>
Signed-off-by: default avatarAndy Fleming <afleming@freescale.com>
parent 379c5145
......@@ -53,6 +53,7 @@ COBJS-$(CONFIG_P2020DS) += ics307_clk.o
COBJS-$(CONFIG_P3041DS) += ics307_clk.o
COBJS-$(CONFIG_P4080DS) += ics307_clk.o
COBJS-$(CONFIG_P5020DS) += ics307_clk.o
COBJS-$(CONFIG_VSC_CROSSBAR) += vsc3316_3308.o
# deal with common files for P-series corenet based devices
SUBLIB-$(CONFIG_P2041RDB) += p_corenet/libp_corenet.o
......
/*
* Copyright 2012 Freescale Semiconductor, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include "vsc3316_3308.h"
#define REVISION_ID_REG 0x7E
#define INTERFACE_MODE_REG 0x79
#define CURRENT_PAGE_REGISTER 0x7F
#define CONNECTION_CONFIG_PAGE 0x00
#define INPUT_STATE_REG 0x13
#define GLOBAL_INPUT_ISE1 0x51
#define GLOBAL_INPUT_ISE2 0x52
#define GLOBAL_INPUT_LOS 0x55
#define GLOBAL_CORE_CNTRL 0x5D
#define OUTPUT_MODE_PAGE 0x23
#define CORE_CONTROL_PAGE 0x25
#define CORE_CONFIG_REG 0x75
int vsc_if_enable(unsigned int vsc_addr)
{
u8 data;
debug("VSC:Configuring VSC at I2C address 0x%2x"
" for 2-wire interface\n", vsc_addr);
/* enable 2-wire Serial InterFace (I2C) */
data = 0x02;
return i2c_write(vsc_addr, INTERFACE_MODE_REG, 1, &data, 1);
}
int vsc3316_config(unsigned int vsc_addr, const int8_t con_arr[][2],
unsigned int num_con)
{
unsigned int i;
u8 rev_id = 0;
int ret;
debug("VSC:Initializing VSC3316 at I2C address 0x%2x"
" for Tx\n", vsc_addr);
ret = i2c_read(vsc_addr, REVISION_ID_REG, 1, &rev_id, 1);
if (ret < 0) {
printf("VSC:0x%x could not read REV_ID from device.\n",
vsc_addr);
return ret;
}
if (rev_id != 0xab) {
printf("VSC: device at address 0x%x is not VSC3316/3308.\n",
vsc_addr);
return -ENODEV;
}
ret = vsc_if_enable(vsc_addr);
if (ret) {
printf("VSC:0x%x could not configured for 2-wire I/F.\n",
vsc_addr);
return ret;
}
/* config connections - page 0x00 */
i2c_reg_write(vsc_addr, CURRENT_PAGE_REGISTER, CONNECTION_CONFIG_PAGE);
/* Making crosspoint connections, by connecting required
* input to output */
for (i = 0; i < num_con ; i++)
i2c_reg_write(vsc_addr, con_arr[i][1], con_arr[i][0]);
/* input state - page 0x13 */
i2c_reg_write(vsc_addr, CURRENT_PAGE_REGISTER, INPUT_STATE_REG);
/* Configuring the required input of the switch */
for (i = 0; i < num_con ; i++)
i2c_reg_write(vsc_addr, con_arr[i][0], 0x80);
/* Setting Global Input LOS threshold value */
i2c_reg_write(vsc_addr, GLOBAL_INPUT_LOS, 0x60);
/* config output mode - page 0x23 */
i2c_reg_write(vsc_addr, CURRENT_PAGE_REGISTER, OUTPUT_MODE_PAGE);
/* Turn ON the Output driver correspond to required output*/
for (i = 0; i < num_con ; i++)
i2c_reg_write(vsc_addr, con_arr[i][1], 0);
/* configure global core control register, Turn on Global core power */
i2c_reg_write(vsc_addr, GLOBAL_CORE_CNTRL, 0);
vsc_wp_config(vsc_addr);
return 0;
}
int vsc3308_config(unsigned int vsc_addr, const int8_t con_arr[][2],
unsigned int num_con)
{
unsigned int i;
u8 rev_id = 0;
int ret;
debug("VSC:Initializing VSC3308 at I2C address 0x%x"
" for Tx\n", vsc_addr);
ret = i2c_read(vsc_addr, REVISION_ID_REG, 1, &rev_id, 1);
if (ret < 0) {
printf("VSC:0x%x could not read REV_ID from device.\n",
vsc_addr);
return ret;
}
if (rev_id != 0xab) {
printf("VSC: device at address 0x%x is not VSC3316/3308.\n",
vsc_addr);
return -ENODEV;
}
ret = vsc_if_enable(vsc_addr);
if (ret) {
printf("VSC:0x%x could not configured for 2-wire I/F.\n",
vsc_addr);
return ret;
}
/* config connections - page 0x00 */
i2c_reg_write(vsc_addr, CURRENT_PAGE_REGISTER, CONNECTION_CONFIG_PAGE);
/* Making crosspoint connections, by connecting required
* input to output */
for (i = 0; i < num_con ; i++)
i2c_reg_write(vsc_addr, con_arr[i][1], con_arr[i][0]);
/*Configure Global Input ISE and gain */
i2c_reg_write(vsc_addr, GLOBAL_INPUT_ISE1, 0x12);
i2c_reg_write(vsc_addr, GLOBAL_INPUT_ISE2, 0x12);
/* input state - page 0x13 */
i2c_reg_write(vsc_addr, CURRENT_PAGE_REGISTER, INPUT_STATE_REG);
/* Turning ON the required input of the switch */
for (i = 0; i < num_con ; i++)
i2c_reg_write(vsc_addr, con_arr[i][0], 0);
/* Setting Global Input LOS threshold value */
i2c_reg_write(vsc_addr, GLOBAL_INPUT_LOS, 0x60);
/* config output mode - page 0x23 */
i2c_reg_write(vsc_addr, CURRENT_PAGE_REGISTER, OUTPUT_MODE_PAGE);
/* Turn ON the Output driver correspond to required output*/
for (i = 0; i < num_con ; i++)
i2c_reg_write(vsc_addr, con_arr[i][1], 0);
/* configure global core control register, Turn on Global core power */
i2c_reg_write(vsc_addr, GLOBAL_CORE_CNTRL, 0);
vsc_wp_config(vsc_addr);
return 0;
}
void vsc_wp_config(unsigned int vsc_addr)
{
debug("VSC:Configuring VSC at address:0x%x for WP\n", vsc_addr);
/* For new crosspoint configuration to occur, WP bit of
* CORE_CONFIG_REG should be set 1 and then reset to 0 */
i2c_reg_write(vsc_addr, CORE_CONFIG_REG, 0x01);
i2c_reg_write(vsc_addr, CORE_CONFIG_REG, 0x0);
}
/*
* Copyright 2012 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef __VSC_CROSSBAR_H_
#define __VSC_CROSSBAR_H 1_
#include <common.h>
#include <i2c.h>
#include <errno.h>
int vsc_if_enable(unsigned int vsc_addr);
int vsc3316_config(unsigned int vsc_addr, const int8_t con_arr[][2],
unsigned int num_con);
int vsc3308_config(unsigned int vsc_addr, const int8_t con_arr[][2],
unsigned int num_con);
void vsc_wp_config(unsigned int vsc_addr);
#endif /* __VSC_CROSSBAR_H_ */
This file contains API information of the initialization code written for
Vitesse cross-point devices, VSC3316 and VSC3308 for board B4860QDS
Author: Shaveta Leekha <shaveta@freescale.com>
About Device:
=============
VSC 3316/3308 is a low-power, low-cost asynchronous crosspoint switch capable of data rates upto 11.5Gbps.
VSC3316 has 16 input and 16 output ports whereas VSC3308 has 8 input and 8 output ports. Programming of these devices are performed by two-wire or four-wire serial interface.
Initialization:
===============
On reset, VSC devices are in low-power state with all inputs, outputs and connections in an off state.
First thing required is to program it to interface with either two-wire or four-wire interface.
In our case the interface is two-wire I2C serial interface. So the value in Interface mode register at address 79.h to be written is 0x02 for two-wire interface. Also for crosspoint connections to be activated, 01.h value need to be written in 75.h (core configuration register).
API Overview:
=============
vsc_if_enable(u8 vsc_addr):
--------------------------
This API programs VSC to interface with either two-wire or four-wire interface. In our case the interface is two-wire I2C serial interface. So the value in Interface mode register at address 79.h to be written is 0x02 for two-wire interface.
Parameters:
vsc_addr - Address of the VSC device on board.
vsc3316_config(u8 vsc_addr, int con_arr[][2], u8 num_con):
---------------------------------------------------------
This API configures the VSC3316 device for required connections. Connection through the VSC device requires the inputs and outputs to be properly configured.
Connection registers are on page 00. It Configures the selected input and output correctly and join them to make a connection. It also program Input state register, Global input ISE, Global input LOS, Global core control, Output mode register and core control registers etc.
vsc3308_config(u8 vsc_addr, int con_arr[][2], u8 num_con) does the essential configurations for VSC3308.
Parameters:
vsc_addr - Address of the VSC device on board.
con_arr - connection array
num_con - number of connections to be configured
vsc_wp_config(u8 vsc_addr):
--------------------------
For crosspoint connections to be activated, 01.h value need to be written in 75.h (core configuration register), which is done by this API.
Parameters:
vsc_addr - Address of the VSC device on board.
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