upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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44 lines
2.4 KiB
44 lines
2.4 KiB
12 years ago
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This file contains API information of the initialization code written for
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Vitesse cross-point devices, VSC3316 and VSC3308 for board B4860QDS
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Author: Shaveta Leekha <shaveta@freescale.com>
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About Device:
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=============
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VSC 3316/3308 is a low-power, low-cost asynchronous crosspoint switch capable of data rates upto 11.5Gbps.
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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.
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Initialization:
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===============
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On reset, VSC devices are in low-power state with all inputs, outputs and connections in an off state.
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First thing required is to program it to interface with either two-wire or four-wire interface.
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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).
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API Overview:
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=============
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vsc_if_enable(u8 vsc_addr):
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--------------------------
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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.
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Parameters:
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vsc_addr - Address of the VSC device on board.
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vsc3316_config(u8 vsc_addr, int con_arr[][2], u8 num_con):
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---------------------------------------------------------
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This API configures the VSC3316 device for required connections. Connection through the VSC device requires the inputs and outputs to be properly configured.
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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.
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vsc3308_config(u8 vsc_addr, int con_arr[][2], u8 num_con) does the essential configurations for VSC3308.
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Parameters:
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vsc_addr - Address of the VSC device on board.
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con_arr - connection array
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num_con - number of connections to be configured
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vsc_wp_config(u8 vsc_addr):
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--------------------------
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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.
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Parameters:
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vsc_addr - Address of the VSC device on board.
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