Re: [Qemu-devel] [PATCH v7 01/13] m25p80: Add support for continuous read out of RDSR and READ_FSR

["mar.krzeminski" <mar.krzeminski@gmail.com>]

W dniu 03.11.2017 o 01:00, Francisco Iglesias pisze:
> Add support for continuous read out of the RDSR and READ_FSR status
> registers until the chip select is deasserted. This feature is supported
> by amongst others 1 or more flashtypes manufactured by Numonyx (Micron),
> Windbond, SST, Gigadevice, Eon and Macronix.
>
> Signed-off-by: Francisco Iglesias <frasse.iglesias@gmail.com>

Acked-by: Marcin Krzemiński<mar.krzeminski@gmail.com>

Regards,
Marcin

> ---
>   hw/block/m25p80.c | 39 ++++++++++++++++++++++++++++++++++++++-
>   1 file changed, 38 insertions(+), 1 deletion(-)
>
> diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
> index a2438b9..d50acc1 100644
> --- a/hw/block/m25p80.c
> +++ b/hw/block/m25p80.c
> @@ -423,6 +423,7 @@ typedef struct Flash {
>       uint8_t data[M25P80_INTERNAL_DATA_BUFFER_SZ];
>       uint32_t len;
>       uint32_t pos;
> +    bool data_read_loop;
>       uint8_t needed_bytes;
>       uint8_t cmd_in_progress;
>       uint32_t cur_addr;
> @@ -983,6 +984,7 @@ static void decode_new_cmd(Flash *s, uint32_t value)
>           }
>           s->pos = 0;
>           s->len = 1;
> +        s->data_read_loop = true;
>           s->state = STATE_READING_DATA;
>           break;
>   
> @@ -993,6 +995,7 @@ static void decode_new_cmd(Flash *s, uint32_t value)
>           }
>           s->pos = 0;
>           s->len = 1;
> +        s->data_read_loop = true;
>           s->state = STATE_READING_DATA;
>           break;
>   
> @@ -1133,6 +1136,7 @@ static int m25p80_cs(SSISlave *ss, bool select)
>           s->pos = 0;
>           s->state = STATE_IDLE;
>           flash_sync_dirty(s, -1);
> +        s->data_read_loop = false;
>       }
>   
>       DB_PRINT_L(0, "%sselect\n", select ? "de" : "");
> @@ -1198,7 +1202,9 @@ static uint32_t m25p80_transfer8(SSISlave *ss, uint32_t tx)
>           s->pos++;
>           if (s->pos == s->len) {
>               s->pos = 0;
> -            s->state = STATE_IDLE;
> +            if (!s->data_read_loop) {
> +                s->state = STATE_IDLE;
> +            }
>           }
>           break;
>   
> @@ -1269,11 +1275,38 @@ static Property m25p80_properties[] = {
>       DEFINE_PROP_END_OF_LIST(),
>   };
>   
> +static int m25p80_pre_load(void *opaque)
> +{
> +    Flash *s = (Flash *)opaque;
> +
> +    s->data_read_loop = false;
> +    return 0;
> +}
> +
> +static bool m25p80_data_read_loop_needed(void *opaque)
> +{
> +    Flash *s = (Flash *)opaque;
> +
> +    return s->data_read_loop;
> +}
> +
> +static const VMStateDescription vmstate_m25p80_data_read_loop = {
> +    .name = "m25p80/data_read_loop",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .needed = m25p80_data_read_loop_needed,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_BOOL(data_read_loop, Flash),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
>   static const VMStateDescription vmstate_m25p80 = {
>       .name = "m25p80",
>       .version_id = 0,
>       .minimum_version_id = 0,
>       .pre_save = m25p80_pre_save,
> +    .pre_load = m25p80_pre_load,
>       .fields = (VMStateField[]) {
>           VMSTATE_UINT8(state, Flash),
>           VMSTATE_UINT8_ARRAY(data, Flash, M25P80_INTERNAL_DATA_BUFFER_SZ),
> @@ -1295,6 +1328,10 @@ static const VMStateDescription vmstate_m25p80 = {
>           VMSTATE_UINT8(spansion_cr3nv, Flash),
>           VMSTATE_UINT8(spansion_cr4nv, Flash),
>           VMSTATE_END_OF_LIST()
> +    },
> +    .subsections = (const VMStateDescription * []) {
> +        &vmstate_m25p80_data_read_loop,
> +        NULL
>       }
>   };
>