Re: [Qemu-devel] [PATCH 05/14] hw/stellaris: Removed gpio_out init array.

[Peter Maydell <peter.maydell@linaro.org>]

On 5 October 2012 01:08, Peter Crosthwaite
<peter.crosthwaite@petalogix.com> wrote:
> From: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
>
> stellaris_init() defines arrays of qemu_irq to decides what each of the GPIO
> pins are connected to. This is ok for inputs (as an input can only have one
> source) but is flawed for outputs as an output can connect to any number of
> sinks. Removed the gpio_out array completely and just replaced its setters with
> direct calls to qdev_connect_gpio_out().

You can only connect an output to one sink. (If you want to wire it to
multiple places you need to use a qemu_irq_split() somewhere.) What
bug is this patch fixing?

-- PMM

> Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
> ---
>  hw/stellaris.c |   26 ++++++++++++--------------
>  1 files changed, 12 insertions(+), 14 deletions(-)
>
> diff --git a/hw/stellaris.c b/hw/stellaris.c
> index 01050d1..a7b68f4 100644
> --- a/hw/stellaris.c
> +++ b/hw/stellaris.c
> @@ -1244,7 +1244,6 @@ static void stellaris_init(const char *kernel_filename, const char *cpu_model,
>      qemu_irq *pic;
>      DeviceState *gpio_dev[7];
>      qemu_irq gpio_in[7][8];
> -    qemu_irq gpio_out[7][8];
>      qemu_irq adc;
>      int sram_size;
>      int flash_size;
> @@ -1284,8 +1283,9 @@ static void stellaris_init(const char *kernel_filename, const char *cpu_model,
>                                                 pic[gpio_irq[i]]);
>              for (j = 0; j < 8; j++) {
>                  gpio_in[i][j] = qdev_get_gpio_in(gpio_dev[i], j);
> -                gpio_out[i][j] = NULL;
>              }
> +        } else {
> +            gpio_dev[i] = NULL;
>          }
>      }
>
> @@ -1308,20 +1308,27 @@ static void stellaris_init(const char *kernel_filename, const char *cpu_model,
>          if (board->peripherals & BP_OLED_SSI) {
>              DeviceState *mux;
>              void *bus;
> +            qemu_irq select_pin;
>
>              bus = qdev_get_child_bus(dev, "ssi");
>              mux = ssi_create_slave(bus, "evb6965-ssi");
> -            gpio_out[GPIO_D][0] = qdev_get_gpio_in(mux, 0);
> +            select_pin = qdev_get_gpio_in(mux, 0);
> +            if (gpio_dev[GPIO_D]) {
> +                qdev_connect_gpio_out(gpio_dev[GPIO_D], 0, select_pin);
> +            }
>
>              bus = qdev_get_child_bus(mux, "ssi0");
>              ssi_create_slave(bus, "ssi-sd");
>
>              bus = qdev_get_child_bus(mux, "ssi1");
>              dev = ssi_create_slave(bus, "ssd0323");
> -            gpio_out[GPIO_C][7] = qdev_get_gpio_in(dev, 0);
> +            if (gpio_dev[GPIO_C]) {
> +                qdev_connect_gpio_out(gpio_dev[GPIO_C], 7,
> +                                        qdev_get_gpio_in(dev, 0));
> +            }
>
>              /* Make sure the select pin is high.  */
> -            qemu_irq_raise(gpio_out[GPIO_D][0]);
> +            qemu_irq_raise(select_pin);
>          }
>      }
>      if (board->dc4 & (1 << 28)) {
> @@ -1347,15 +1354,6 @@ static void stellaris_init(const char *kernel_filename, const char *cpu_model,
>
>          stellaris_gamepad_init(5, gpad_irq, gpad_keycode);
>      }
> -    for (i = 0; i < 7; i++) {
> -        if (board->dc4 & (1 << i)) {
> -            for (j = 0; j < 8; j++) {
> -                if (gpio_out[i][j]) {
> -                    qdev_connect_gpio_out(gpio_dev[i], j, gpio_out[i][j]);
> -                }
> -            }
> -        }
> -    }
>  }
>
>  /* FIXME: Figure out how to generate these from stellaris_boards.  */
> --
> 1.7.0.4
>
>