74 lines
2.6 KiB
Go
74 lines
2.6 KiB
Go
// Copyright 2022 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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// H5 model.
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package allwinner
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import (
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"fmt"
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"strings"
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"periph.io/x/conn/v3/pin"
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"periph.io/x/host/v3/sysfs"
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)
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// mappingH6 describes the mapping of the H5 processor gpios to their
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// alternate functions.
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// According to https://linux-sunxi.org/H616 H616 and H618 are the same.
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// allwinner marketing team seems to disagree.
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//
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// It omits the in & out functions which are available on all gpio.
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//
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// The mapping comes from the datasheet page 26:
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// https://linux-sunxi.org/images/3/30/H616_Datasheet_V1.0.pdf
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//
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// - The datasheet uses TWI instead of I2C but it is renamed here for
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// consistency.
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// - RGMII means Reduced gigabit media-independent interface.
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// - SDC means SDCard?
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// - NAND connects to a NAND flash controller.
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// - CSI and CCI are for video capture.
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var mappingH6 = map[string][5]pin.Func{
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"PC0": {"NAND_WE", "SDC2_DS", "SPI0_CLK", "", "PA_EINT0"},
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"PC1": {"NAND_ALE", "SDC2_RST", "", "", "PA_EINT1"},
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"PC2": {"NAND_CLE", "", "SPI0_MOSI", "", "PA_EINT2"},
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"PC3": {"NAND_CE1", "", "SPI0_CS0", "BOOT_SEL1", "PA_EINT3"},
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"PC4": {"NAND_CE0", "", "SPI0_MIS0", "BOOT_SEL2", "PA_EINT4"},
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"PC5": {"NAND_RE", "SDC2_CLK", "", "BOOT_SEL3", "PA_EINT5"},
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"PC6": {"NAND_RB0", "SDC2_CMD", "", "BOOT_SEL4", "PA_EINT6"},
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"PC7": {"NAND_RB1", "", "SPI0_CS1", "", "PA_EINT7"},
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"PC8": {"NAND_DQ7", "SDC2_D3", "", "", "PA_EINT8"},
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"PC9": {"NAND_DQ6", "SDC2_D4", "", "", "PA_EINT9"},
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"PC10": {"NAND_DQ5", "SDC2_D0", "", "", "PA_EINT10"},
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"PC11": {"NAND_DQ4", "SDC2_D5", "", "", "PA_EINT11"},
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"PC12": {"NAND_DQS", "", "", "", "PA_EINT12"},
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"PC13": {"NAND_DQ3", "SDC2_D1", "", "", "PA_EINT13"},
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"PC14": {"NAND_DQ2", "SDC2_D6", "", "", "PA_EINT14"},
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"PC15": {"NAND_DQ1", "SDC2_D1", "SPI0_WP", "", "PA_EINT15"},
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"PC16": {"NAND_DQ0", "SDC2_D7", "SPI0_HOLD", "", "PA_EINT16"},
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}
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// mapH6Pins uses mappingH6 to actually set the altFunc fields of all gpio
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// and mark them as available.
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//
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// It is called by the generic allwinner processor code if an H6 is detected.
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func mapH6Pins() error {
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fmt.Println("Initializing H6 pins.")
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for name, altFuncs := range mappingH6 {
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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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