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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=62.239.224.235; envelope-from=jasper.lowell@bt.com; helo=smtpe1.intersmtp.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/17 04:24:49 X-ACL-Warn: Detected OS = ??? X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tony.nguyen@bt.com, mark.cave-ayland@ilande.co.uk, atar4qemu@gmail.com, Jasper Lowell Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @bt.com) Content-Type: text/plain; charset="utf-8" Commands are initiated by setting certain bits in the CMDR register. The Receiver Reset (RRES) command clears the receiver FIFO (RFIFO). Signed-off-by: Jasper Lowell --- hw/char/escc2.c | 24 ++++++++++++++++++++++++ hw/char/trace-events | 1 + 2 files changed, 25 insertions(+) diff --git a/hw/char/escc2.c b/hw/char/escc2.c index 059e033089..5afb8aa6d9 100644 --- a/hw/char/escc2.c +++ b/hw/char/escc2.c @@ -29,6 +29,12 @@ =20 /* CMDR. */ #define REGISTER_CMDR_OFFSET 0x20 +#define REGISTER_CMDR_RMC 0x80 +#define REGISTER_CMDR_RRES 0x40 +#define REGISTER_CMDR_RFRD 0x20 +#define REGISTER_CMDR_STI 0x10 +#define REGISTER_CMDR_XF 0x8 +#define REGISTER_CMDR_XRES 0x1 =20 /* MODE. */ #define REGISTER_MODE_OFFSET 0x22 @@ -741,6 +747,23 @@ static uint64_t escc2_mem_read(void *opaque, hwaddr ad= dr, unsigned size) return value; } =20 +static void escc2_channel_command(ESCC2ChannelState *channel) +{ + uint8_t tmp, command; + + command =3D REGISTER_READ(channel, REGISTER_CMDR); + trace_escc2_channel_command(CHANNEL_CHAR(channel), command); + + if (command & REGISTER_CMDR_RRES) { + memset(channel->fifo_receive, 0, sizeof(channel->fifo_receive)); + REGISTER_WRITE(channel, REGISTER_RBCL, 0); + + tmp =3D REGISTER_READ(channel, REGISTER_STAR); + tmp &=3D ~(REGISTER_STAR_RFNE); + REGISTER_WRITE(channel, REGISTER_STAR, tmp); + } +} + static void escc2_mem_write(void *opaque, hwaddr addr, uint64_t value, unsigned size) { @@ -767,6 +790,7 @@ static void escc2_mem_write(void *opaque, hwaddr addr, = uint64_t value, break; case REGISTER_CMDR_OFFSET: REGISTER_WRITE(channel, REGISTER_CMDR, value); + escc2_channel_command(channel); break; case REGISTER_MODE_OFFSET: REGISTER_WRITE(channel, REGISTER_MODE, value); diff --git a/hw/char/trace-events b/hw/char/trace-events index b4f4f30815..47b46b92c9 100644 --- a/hw/char/trace-events +++ b/hw/char/trace-events @@ -59,6 +59,7 @@ escc_sunmouse_event(int dx, int dy, int buttons_state) "d= x=3D%d dy=3D%d buttons=3D0x%0 # escc2.c escc2_irq_update(uint8_t gis) "value 0x%x" escc2_mem_read(char channel, uint32_t addr, uint8_t value) "channel %c add= r 0x%x value 0x%x" +escc2_channel_command(char channel, uint8_t command) "channel %c command 0= x%x" escc2_mem_write(char channel, uint32_t addr, uint8_t value) "channel %c ad= dr 0x%x value 0x%x" =20 # pl011.c --=20 2.26.2