150 lines
4.8 KiB
Go
150 lines
4.8 KiB
Go
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// Copyright 2016 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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// This file contains pin mapping information that is specific to the Allwinner
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// R8 model.
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package allwinner
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import (
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"strings"
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"periph.io/x/periph/conn/pin"
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"periph.io/x/periph/host/sysfs"
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)
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// R8 specific pins.
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var (
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FEL *pin.BasicPin // Boot mode selection
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MIC_IN *pin.BasicPin // Microphone in
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MIC_GND *pin.BasicPin // Microphone ground
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HP_LEFT *pin.BasicPin // Left speaker out
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HP_RIGHT *pin.BasicPin // Right speaker out
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HP_COM *pin.BasicPin // Speaker common
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X1, X2, Y1, Y2 *pin.BasicPin // Touch screen pins
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)
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//
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func init() {
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FEL = &pin.BasicPin{N: "FEL"}
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MIC_IN = &pin.BasicPin{N: "MIC_IN"}
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MIC_GND = &pin.BasicPin{N: "MIC_GND"}
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HP_LEFT = &pin.BasicPin{N: "HP_LEFT"}
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HP_RIGHT = &pin.BasicPin{N: "HP_RIGHT"}
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HP_COM = &pin.BasicPin{N: "HP_COM"}
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X1 = &pin.BasicPin{N: "X1"}
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X2 = &pin.BasicPin{N: "X2"}
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Y1 = &pin.BasicPin{N: "Y1"}
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Y2 = &pin.BasicPin{N: "Y2"}
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}
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// mappingR8 describes the mapping of each R8 processor gpio to their alternate
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// functions.
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//
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// It omits the in & out functions which are available on all pins.
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//
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// The mapping comes from the datasheet page 18:
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// https://github.com/NextThingCo/CHIP-Hardware/raw/master/CHIP%5Bv1_0%5D/CHIPv1_0-BOM-Datasheets/Allwinner%20R8%20Datasheet%20V1.2.pdf
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//
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// - The datasheet uses TWI instead of I2C but this is renamed here for consistency.
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var mappingR8 = map[string][5]pin.Func{
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"PB0": {"I2C0_SCL"},
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"PB1": {"I2C0_SDA"},
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"PB2": {"PWM0", "", "", "", "EINT16"},
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"PB3": {"IR_TX", "", "", "", "EINT17"},
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"PB4": {"IR_RX", "", "", "", "EINT18"},
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"PB10": {"SPI2_CS1"},
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"PB15": {"I2C1_SCL"},
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"PB16": {"I2C1_SDA"},
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"PB17": {"I2C2_SCL"},
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"PB18": {"I2C2_SDA"},
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"PC0": {"NAND_WE", "SPI0_MOSI"},
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"PC1": {"NAND_ALE", "SPI0_MISO"},
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"PC2": {"NAND_CLE", "SPI0_CLK"},
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"PC3": {"NAND_CE1", "SPI0_CS0"},
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"PC4": {"NAND_CE0"},
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"PC5": {"NAND_RE"},
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"PC6": {"NAND_RB0", "SDC2_CMD"},
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"PC7": {"NAND_RB1", "SDC2_CLK"},
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"PC8": {"NAND_DQ0", "SDC2_D0"},
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"PC9": {"NAND_DQ1", "SDC2_D1"},
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"PC10": {"NAND_DQ2", "SDC2_D2"},
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"PC11": {"NAND_DQ3", "SDC2_D3"},
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"PC12": {"NAND_DQ4", "SDC2_D4"},
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"PC13": {"NAND_DQ5", "SDC2_D5"},
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"PC14": {"NAND_DQ6", "SDC2_D6"},
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"PC15": {"NAND_DQ7", "SDC2_D7"},
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"PC19": {""},
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"PD2": {"LCD_D2", "UART2_TX"},
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"PD3": {"LCD_D3", "UART2_RX"},
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"PD4": {"LCD_D4", "UART2_CTX"},
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"PD5": {"LCD_D5", "UART2_RTS"},
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"PD6": {"LCD_D6", "ECRS"},
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"PD7": {"LCD_D7", "ECOL"},
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"PD10": {"LCD_D10", "ERXD0"},
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"PD11": {"LCD_D11", "ERXD1"},
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"PD12": {"LCD_D12", "ERXD2"},
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"PD13": {"LCD_D13", "ERXD3"},
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"PD14": {"LCD_D14", "ERXCK"},
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"PD15": {"LCD_D15", "ERXERR"},
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"PD18": {"LCD_D18", "ERXDV"},
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"PD19": {"LCD_D19", "ETXD0"},
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"PD20": {"LCD_D20", "ETXD1"},
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"PD21": {"LCD_D21", "ETXD2"},
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"PD22": {"LCD_D22", "ETXD3"},
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"PD23": {"LCD_D23", "ETXEN"},
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"PD24": {"LCD_CLK", "ETXCK"},
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"PD25": {"LCD_DE", "ETXERR"},
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"PD26": {"LCD_HSYNC", "EMDC"},
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"PD27": {"LCD_VSYNC", "EMDIO"},
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"PE0": {"TS_CLK", "CSI_PCLK", "SPI2_CS0", "", "EINT14"},
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"PE1": {"TS_ERR", "CSI_MCLK", "SPI2_CLK", "", "EINT15"},
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"PE2": {"TS_SYNC", "CSI_HSYNC", "SPI2_MOSI"},
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"PE3": {"TS_DVLD", "CSI_VSYNC", "SPI2_MISO"},
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"PE4": {"TS_D0", "CSI_D0", "SDC2_D0"},
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"PE5": {"TS_D1", "CSI_D1", "SDC2_D1"},
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"PE6": {"TS_D2", "CSI_D2", "SDC2_D2"},
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"PE7": {"TS_D3", "CSI_D3", "SDC2_D3"},
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"PE8": {"TS_D4", "CSI_D4", "SDC2_CMD"},
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"PE9": {"TS_D5", "CSI_D5", "SDC2_CLK"},
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"PE10": {"TS_D6", "CSI_D6", "UART1_TX"},
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"PE11": {"TS_D7", "CSI_D7", "UART1_RX"},
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"PF0": {"SDC0_D1", "", "JTAG1_TMS"},
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"PF1": {"SDC0_D0", "", "JTAG1_TDI"},
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"PF2": {"SDC0_CLK", "", "UART0_TX"},
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"PF3": {"SDC0_CMD", "", "JTAG1_TDO"},
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"PF4": {"SDC0_D3", "", "UART0_RX"},
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"PF5": {"SDC0_D2", "", "JTAG1_TCK"},
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"PG0": {"GPS_CLK", "", "", "", "EINT0"},
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"PG1": {"GPS_SIGN", "", "", "", "EINT1"},
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"PG2": {"GPS_MAG", "", "", "", "EINT2"},
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"PG3": {"", "", "UART1_TX", "", "EINT3"},
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"PG4": {"", "", "UART1_RX", "", "EINT4"},
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"PG9": {"SPI1_CS0", "UART3_TX", "", "", "EINT9"},
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"PG10": {"SPI1_CLK", "UART3_RX", "", "", "EINT10"},
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"PG11": {"SPI1_MOSI", "UART3_CTS", "", "", "EINT11"},
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"PG12": {"SPI1_MISO", "UART3_RTS", "", "", "EINT12"},
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}
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// mapR8Pins uses mappingR8 to actually set the altFunc fields of all gpio and
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// mark them as available.
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//
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// It is called by the generic allwinner processor code if a R8 is detected.
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func mapR8Pins() error {
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for name, altFuncs := range mappingR8 {
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pin := cpupins[name]
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pin.altFunc = altFuncs
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pin.available = true
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if strings.Contains(string(altFuncs[4]), "EINT") {
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pin.supportEdge = true
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}
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// Initializes the sysfs corresponding pin right away.
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pin.sysfsPin = sysfs.Pins[pin.Number()]
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}
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return nil
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}
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