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{hw/i2c,docs/system/arm}: Allwinner TWI/I2C Emulation

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This patch implements Allwinner TWI/I2C controller emulation. Only
master-mode functionality is implemented.

The SPL boot for Cubieboard expects AXP209 PMIC on TWI0/I2C0 bus, so this is
first part enabling the TWI/I2C bus operation.

Since both Allwinner A10 and H3 use the same module, it is added for
both boards.

Docs are also updated for Cubieboard and Orangepi-PC board to indicate
I2C availability.

Signed-off-by: Strahinja Jankovic <strahinja.p.jankovic@gmail.com>
Reviewed-by: Niek Linnenbank <nieklinnenbank@gmail.com>
Message-id: 20221226220303.14420-4-strahinja.p.jankovic@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Strahinja Jankovic 2022-12-26 23:02:59 +01:00 • committed by Peter Maydell
parent edd3a59d5b
commit 9be8a82c0e
12 changed files with 551 additions and 1 deletions
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55
include/hw/i2c/allwinner-i2c.h Normal file
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/*
* Allwinner I2C Bus Serial Interface registers definition
*
* Copyright (C) 2022 Strahinja Jankovic. <strahinja.p.jankovic@gmail.com>
*
* This file is derived from IMX I2C controller,
* by Jean-Christophe DUBOIS .
*
* 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef ALLWINNER_I2C_H
#define ALLWINNER_I2C_H
#include "hw/sysbus.h"
#include "qom/object.h"
#define TYPE_AW_I2C "allwinner.i2c"
OBJECT_DECLARE_SIMPLE_TYPE(AWI2CState, AW_I2C)
#define AW_I2C_MEM_SIZE 0x24
struct AWI2CState {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
MemoryRegion iomem;
I2CBus *bus;
qemu_irq irq;
uint8_t addr;
uint8_t xaddr;
uint8_t data;
uint8_t cntr;
uint8_t stat;
uint8_t ccr;
uint8_t srst;
uint8_t efr;
uint8_t lcr;
};
#endif /* ALLWINNER_I2C_H */