From: Giulio Benetti <giulio.benetti@micronovasrl.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Kees Cook <keescook@chromium.org>,
Matthias Brugger <mbrugger@suse.com>,
Allen Pais <allen.lkml@gmail.com>, Sean Young <sean@mess.org>,
Ed Blake <ed.blake@sondrel.com>,
Stefan Potyra <Stefan.Potyra@elektrobit.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Joshua Scott <joshua.scott@alliedtelesis.co.nz>,
Vignesh R <vigneshr@ti.com>,
Rolf Evers-Fischer <rolf.evers.fischer@aptiv.com>,
Aaron Sierra <asierra@xes-inc.com>,
Rafael Gago <rafael.gago@gmail.com>,
Joel Stanley <joel@jms.id.au>, Sean Wang <sean.wang@mediatek.com>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
Giulio Benetti <giulio.benetti@micronovasrl.com>
Subject: [PATCH 1/8] serial: 8250_dw: add em485 support
Date: Fri, 1 Jun 2018 14:40:14 +0200 [thread overview]
Message-ID: <20180601124021.102970-2-giulio.benetti@micronovasrl.com> (raw)
In-Reply-To: <20180601124021.102970-1-giulio.benetti@micronovasrl.com>
Need to use rs485 transceiver so let's use existing em485 485 emulation
layer on top of 8250.
Add rs485_config callback to port.
Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
---
drivers/tty/serial/8250/8250_dw.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 6fcdb90f616a..45366e6e5411 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -314,6 +314,36 @@ static void dw8250_set_ldisc(struct uart_port *p, struct ktermios *termios)
serial8250_do_set_ldisc(p, termios);
}
+static int dw8250_rs485_config(struct uart_port *p,
+ struct serial_rs485 *rs485)
+{
+ struct uart_8250_port *up = up_to_u8250p(p);
+
+ /* Clamp the delays to [0, 100ms] */
+ rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
+ rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U);
+
+ p->rs485 = *rs485;
+
+ /*
+ * Both serial8250_em485_init and serial8250_em485_destroy
+ * are idempotent
+ */
+ if (rs485->flags & SER_RS485_ENABLED) {
+ int ret = serial8250_em485_init(up);
+
+ if (ret) {
+ rs485->flags &= ~SER_RS485_ENABLED;
+ p->rs485.flags &= ~SER_RS485_ENABLED;
+ }
+ return ret;
+ }
+
+ serial8250_em485_destroy(up);
+
+ return 0;
+}
+
/*
* dw8250_fallback_dma_filter will prevent the UART from getting just any free
* channel on platforms that have DMA engines, but don't have any channels
@@ -449,6 +479,7 @@ static int dw8250_probe(struct platform_device *pdev)
p->serial_out = dw8250_serial_out;
p->set_ldisc = dw8250_set_ldisc;
p->set_termios = dw8250_set_termios;
+ p->rs485_config = dw8250_rs485_config;
p->membase = devm_ioremap(dev, regs->start, resource_size(regs));
if (!p->membase)
--
2.17.0
next prev parent reply other threads:[~2018-06-01 12:40 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-01 12:40 [PATCH 0/8] serial: 8250: Add 485 emulation to 8250_dw Giulio Benetti
2018-06-01 12:40 ` Giulio Benetti [this message]
2018-06-01 12:40 ` [PATCH 2/8] serial: 8250_dw: allow enable rs485 at boot time Giulio Benetti
2018-06-01 12:40 ` [PATCH 3/8] serial: 8250: Copy em485 from port to real port Giulio Benetti
2018-06-04 10:13 ` Andy Shevchenko
2018-06-04 10:52 ` Giulio Benetti
2018-06-01 12:40 ` [PATCH 4/8] serial: 8250: Handle case port doesn't have TEMT interrupt using em485 Giulio Benetti
2018-06-04 10:17 ` Andy Shevchenko
2018-06-04 10:50 ` Giulio Benetti
2018-06-04 11:38 ` Andy Shevchenko
2018-06-04 11:50 ` Giulio Benetti
2018-06-04 12:26 ` Andy Shevchenko
2018-06-04 17:40 ` Matwey V. Kornilov
2018-06-04 18:50 ` Giulio Benetti
2018-06-05 10:51 ` Matwey V. Kornilov
2018-06-06 9:36 ` Giulio Benetti
2018-06-06 9:49 ` [PATCH 2/4] serial: 8250: Copy mctrl when register port Giulio Benetti
2018-06-06 9:49 ` [PATCH 3/4] serial: 8250: Make em485_rts_after_send() set mctrl according to rts state Giulio Benetti
2018-06-06 12:02 ` Andy Shevchenko
2018-06-06 9:49 ` [PATCH 4/4] serial: core: Mask mctrl with TIOCM_RTS too if rs485 on and RTS_AFTER_SEND set Giulio Benetti
2018-06-06 12:03 ` Andy Shevchenko
2018-06-06 12:07 ` Giulio Benetti
2018-06-06 9:49 ` [PATCH 1/4] serial: 8250: Copy em485 from port to real port Giulio Benetti
2018-06-06 11:56 ` Andy Shevchenko
2018-06-06 12:15 ` Giulio Benetti
2018-06-06 13:11 ` Andy Shevchenko
2018-06-06 14:32 ` Giulio Benetti
2018-06-06 18:55 ` Matwey V. Kornilov
2018-06-06 19:15 ` Giulio Benetti
2018-06-07 7:03 ` Matwey V. Kornilov
2018-06-07 12:43 ` Giulio Benetti
2018-06-06 12:01 ` [PATCH 2/4] serial: 8250: Copy mctrl when register port Andy Shevchenko
2018-06-06 9:51 ` [PATCH 2/4] serial: 8250_dw: allow enable rs485 at boot time Giulio Benetti
2018-06-06 9:51 ` [PATCH 3/4] serial: 8250: Handle case port doesn't have TEMT interrupt using em485 Giulio Benetti
2018-06-13 16:59 ` Alan Cox
2018-06-06 9:51 ` [PATCH 4/4] serial: 8250_dw: treat rpm suspend with -EBUSY if RS485 ON and RTS_AFTER_SEND Giulio Benetti
2018-06-06 9:51 ` [PATCH 1/4] serial: 8250_dw: add em485 support Giulio Benetti
2018-06-06 16:51 ` Andy Shevchenko
2018-06-06 19:16 ` Giulio Benetti
2018-06-01 12:40 ` [PATCH 5/8] serial: 8250_dw: treat rpm suspend with -EBUSY if RS485 ON and RTS_AFTER_SEND Giulio Benetti
2018-06-01 12:40 ` [PATCH 6/8] serial: 8250: Copy mctrl when register port Giulio Benetti
2018-06-06 14:31 ` Aaron Sierra
2018-06-06 14:44 ` Giulio Benetti
2018-06-01 12:40 ` [PATCH 7/8] serial: 8250: Make em485_rts_after_send() set mctrl according to rts state Giulio Benetti
2018-06-01 12:40 ` [PATCH 8/8] serial: core: Mask mctrl with TIOCM_RTS too if rs485 on and RTS_AFTER_SEND set Giulio Benetti
2018-06-04 10:12 ` [PATCH 0/8] serial: 8250: Add 485 emulation to 8250_dw Andy Shevchenko
2018-06-04 10:34 ` Matwey V. Kornilov
2018-06-04 10:42 ` Giulio Benetti
2018-06-04 11:44 ` Andy Shevchenko
2018-06-04 14:58 ` Giulio Benetti
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