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Re: [Qemu-devel] [PATCH v4 01/11] ppc4xx_i2c: Remove unimplemented sdata


From: David Gibson
Subject: Re: [Qemu-devel] [PATCH v4 01/11] ppc4xx_i2c: Remove unimplemented sdata and intr registers
Date: Wed, 20 Jun 2018 10:14:00 +1000
User-agent: Mutt/1.10.0 (2018-05-17)

On Tue, Jun 19, 2018 at 10:52:15AM +0200, BALATON Zoltan wrote:
> We don't emulate slave mode so related registers are not needed.
> [lh]sadr are only retained to avoid too many warnings and simplify
> debugging but sdata is not even correct because device has a 4 byte
> FIFO instead so just remove this unimplemented register for now.
> 
> The intr register is also not implemented correctly, it is for
> diagnostics and normally not even visible on device without explicitly
> enabling it. As no guests are known to need this remove it as well.
> 
> Signed-off-by: BALATON Zoltan <address@hidden>
> ---
> v4: Updated commit message

Applied to ppc-for-3.0, thanks.

> 
>  hw/i2c/ppc4xx_i2c.c         | 16 +---------------
>  include/hw/i2c/ppc4xx_i2c.h |  4 +---
>  2 files changed, 2 insertions(+), 18 deletions(-)
> 
> diff --git a/hw/i2c/ppc4xx_i2c.c b/hw/i2c/ppc4xx_i2c.c
> index d1936db..4e0aaae 100644
> --- a/hw/i2c/ppc4xx_i2c.c
> +++ b/hw/i2c/ppc4xx_i2c.c
> @@ -3,7 +3,7 @@
>   *
>   * Copyright (c) 2007 Jocelyn Mayer
>   * Copyright (c) 2012 Fran├žois Revol
> - * Copyright (c) 2016 BALATON Zoltan
> + * Copyright (c) 2016-2018 BALATON Zoltan
>   *
>   * Permission is hereby granted, free of charge, to any person obtaining a 
> copy
>   * of this software and associated documentation files (the "Software"), to 
> deal
> @@ -63,7 +63,6 @@ static void ppc4xx_i2c_reset(DeviceState *s)
>      i2c->mdcntl = 0;
>      i2c->sts = 0;
>      i2c->extsts = 0x8f;
> -    i2c->sdata = 0;
>      i2c->lsadr = 0;
>      i2c->hsadr = 0;
>      i2c->clkdiv = 0;
> @@ -71,7 +70,6 @@ static void ppc4xx_i2c_reset(DeviceState *s)
>      i2c->xfrcnt = 0;
>      i2c->xtcntlss = 0;
>      i2c->directcntl = 0xf;
> -    i2c->intr = 0;
>  }
>  
>  static inline bool ppc4xx_i2c_is_master(PPC4xxI2CState *i2c)
> @@ -139,9 +137,6 @@ static uint64_t ppc4xx_i2c_readb(void *opaque, hwaddr 
> addr, unsigned int size)
>                            TYPE_PPC4xx_I2C, __func__);
>          }
>          break;
> -    case 2:
> -        ret = i2c->sdata;
> -        break;
>      case 4:
>          ret = i2c->lmadr;
>          break;
> @@ -181,9 +176,6 @@ static uint64_t ppc4xx_i2c_readb(void *opaque, hwaddr 
> addr, unsigned int size)
>      case 16:
>          ret = i2c->directcntl;
>          break;
> -    case 17:
> -        ret = i2c->intr;
> -        break;
>      default:
>          if (addr < PPC4xx_I2C_MEM_SIZE) {
>              qemu_log_mask(LOG_UNIMP, "%s: Unimplemented register 0x%"
> @@ -229,9 +221,6 @@ static void ppc4xx_i2c_writeb(void *opaque, hwaddr addr, 
> uint64_t value,
>              }
>          }
>          break;
> -    case 2:
> -        i2c->sdata = value;
> -        break;
>      case 4:
>          i2c->lmadr = value;
>          if (i2c_bus_busy(i2c->bus)) {
> @@ -302,9 +291,6 @@ static void ppc4xx_i2c_writeb(void *opaque, hwaddr addr, 
> uint64_t value,
>      case 16:
>          i2c->directcntl = value & 0x7;
>          break;
> -    case 17:
> -        i2c->intr = value;
> -        break;
>      default:
>          if (addr < PPC4xx_I2C_MEM_SIZE) {
>              qemu_log_mask(LOG_UNIMP, "%s: Unimplemented register 0x%"
> diff --git a/include/hw/i2c/ppc4xx_i2c.h b/include/hw/i2c/ppc4xx_i2c.h
> index 3c60307..e4b6ded 100644
> --- a/include/hw/i2c/ppc4xx_i2c.h
> +++ b/include/hw/i2c/ppc4xx_i2c.h
> @@ -3,7 +3,7 @@
>   *
>   * Copyright (c) 2007 Jocelyn Mayer
>   * Copyright (c) 2012 Fran├žois Revol
> - * Copyright (c) 2016 BALATON Zoltan
> + * Copyright (c) 2016-2018 BALATON Zoltan
>   *
>   * Permission is hereby granted, free of charge, to any person obtaining a 
> copy
>   * of this software and associated documentation files (the "Software"), to 
> deal
> @@ -49,7 +49,6 @@ typedef struct PPC4xxI2CState {
>      uint8_t mdcntl;
>      uint8_t sts;
>      uint8_t extsts;
> -    uint8_t sdata;
>      uint8_t lsadr;
>      uint8_t hsadr;
>      uint8_t clkdiv;
> @@ -57,7 +56,6 @@ typedef struct PPC4xxI2CState {
>      uint8_t xfrcnt;
>      uint8_t xtcntlss;
>      uint8_t directcntl;
> -    uint8_t intr;
>  } PPC4xxI2CState;
>  
>  #endif /* PPC4XX_I2C_H */

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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