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As well as being able to generate its own i2c transactions, the ppc4xx i2c controller has a DIRECTCNTL register which allows explicit control of the i2c lines. Using this register an OS can directly bitbang i2c operations. In order to let emulated i2c devices respond to this, we need to wire up the DIRECTCNTL register to qemu's bitbanged i2c handling code. Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
65 lines
2 KiB
C
65 lines
2 KiB
C
/*
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* PPC4xx I2C controller emulation
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*
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* Copyright (c) 2007 Jocelyn Mayer
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* Copyright (c) 2012 François Revol
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* Copyright (c) 2016-2018 BALATON Zoltan
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef PPC4XX_I2C_H
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#define PPC4XX_I2C_H
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#include "qemu-common.h"
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#include "hw/sysbus.h"
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#include "hw/i2c/i2c.h"
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/* from hw/i2c/bitbang_i2c.h */
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typedef struct bitbang_i2c_interface bitbang_i2c_interface;
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#define TYPE_PPC4xx_I2C "ppc4xx-i2c"
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#define PPC4xx_I2C(obj) OBJECT_CHECK(PPC4xxI2CState, (obj), TYPE_PPC4xx_I2C)
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typedef struct PPC4xxI2CState {
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/*< private >*/
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SysBusDevice parent_obj;
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/*< public >*/
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I2CBus *bus;
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qemu_irq irq;
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MemoryRegion iomem;
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bitbang_i2c_interface *bitbang;
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uint8_t mdata;
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uint8_t lmadr;
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uint8_t hmadr;
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uint8_t cntl;
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uint8_t mdcntl;
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uint8_t sts;
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uint8_t extsts;
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uint8_t lsadr;
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uint8_t hsadr;
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uint8_t clkdiv;
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uint8_t intrmsk;
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uint8_t xfrcnt;
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uint8_t xtcntlss;
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uint8_t directcntl;
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} PPC4xxI2CState;
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#endif /* PPC4XX_I2C_H */
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