From: frans.klaver@xsens.com (Frans Klaver) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 06/16] tty: serial: Add 8250-core based omap driver Date: Mon, 29 Sep 2014 11:38:23 +0200 Message-ID: <20140929093823.GD13952@ci00147.xsens-tech.local> (raw) In-Reply-To: <1410377411-26656-7-git-send-email-bigeasy@linutronix.de> On Wed, Sep 10, 2014 at 09:30:01PM +0200, Sebastian Andrzej Siewior wrote: > + /* > + * We enable TRIG_GRANU for RX and TX and additionaly we set > + * SCR_TX_EMPTY bit. The result is the following: > + * - RX_TRIGGER amount of bytes in the FIFO will cause an interrupt. > + * - less than RX_TRIGGER number of bytes will also cause an interrupt > + * once the UART decides that there no new bytes arriving. > + * - Once THRE is enabled, the interrupt will be fired once the FIFO is > + * empty - the trigger level is ignored here. > + * > + * Once DMA is enabled: > + * - UART will assert the TX DMA line once there is room for TX_TRIGGER > + * bytes in the TX FIFO. On each assert the DMA engine will move > + * TX_TRIGGER bytes into the FIFO. > + * - UART will assert the RX DMA line once there are RX_TRIGGER bytes in > + * the FIFO and move RX_TRIGGER bytes. > + * This is because treshold and trigger values are the same. threshold > + /* > + * It claims to be 16C750 compatible however it is a little different. > + * It has EFR and has no FCR7_64byte bit. The AFE (which it claims to > + * have) is enabled via EFR instead of MCR. The type is set here 8250 > + * just to get things going. UNKNOWN does not work for a few reasons and > + * we don't need our own type since we don't use 8250's set_termios() > + * and our "bugs" are handeld via the bug member. handled > + */ > + up.port.type = PORT_8250; > + up.port.iotype = UPIO_MEM; > + up.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SOFT_FLOW | > + UPF_HARD_FLOW; > + up.port.private_data = priv; > + > + up.port.regshift = 2; > + up.port.fifosize = 64; > + up.tx_loadsz = 64; > + up.capabilities = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP; > +#ifdef CONFIG_PM_RUNTIME > + /* > + * PM_RUNTIME is mostly transparent. However to do it right we need to a need to _do_ a ...? > + * TX empty interrupt before we can put the device to auto idle. So if > + * PM_RUNTIME is not enabled we don't add that flag and can spare that > + * one extra interrupt in the TX path. > + */ <snip> > +config SERIAL_8250_OMAP > + tristate "Support for OMAP internal UART (8250 based driver)" > + depends on SERIAL_8250 && ARCH_OMAP2PLUS > + help > + If you have a machine based on an Texas Instruments OMAP CPU you > + can enable its onboard serial ports by enabling this option. > + > + This driver is in early stage and uses ttyS instead of ttyO. > + I just wondered if this driver should be marked experimental? Thanks, Frans
next prev parent reply index Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-09-10 19:29 [PATCH 00/16 v9] omap 8250 based uart + DMA Sebastian Andrzej Siewior 2014-09-10 19:29 ` [PATCH 01/16] tty: serial: 8250_core: allow to set ->throttle / ->unthrottle callbacks Sebastian Andrzej Siewior 2014-09-10 19:29 ` [PATCH 02/16] tty: serial: 8250_core: add run time pm Sebastian Andrzej Siewior 2014-09-29 9:46 ` Frans Klaver 2014-09-29 13:39 ` Sebastian Andrzej Siewior 2014-09-10 19:29 ` [PATCH 03/16] tty: serial: 8250_core: read only RX if there is something in the FIFO Sebastian Andrzej Siewior 2015-02-09 13:34 ` Nicolas Schichan 2015-02-09 23:34 ` Peter Hurley 2015-02-10 9:32 ` Sebastian Andrzej Siewior 2015-02-10 12:04 ` Nicolas Schichan 2015-02-10 17:46 ` Peter Hurley 2015-02-11 20:01 ` Peter Hurley 2015-02-11 20:03 ` Tony Lindgren 2015-02-11 20:42 ` Peter Hurley 2015-02-12 8:45 ` Sebastian Andrzej Siewior 2015-02-12 9:40 ` Russell King - ARM Linux 2015-02-12 16:32 ` Peter Hurley 2015-02-12 19:23 ` Sebastian Andrzej Siewior 2015-02-12 19:55 ` Peter Hurley 2015-02-12 20:34 ` Sebastian Andrzej Siewior 2015-02-13 18:51 ` Sebastian Andrzej Siewior 2015-02-13 23:15 ` Russell King - ARM Linux 2015-02-15 17:32 ` [PATCH] serial: 8250: Revert "tty: serial: 8250_core: read only RX if there is something in the FIFO" Sebastian Andrzej Siewior 2015-05-12 20:25 ` Tony Lindgren 2014-09-10 19:29 ` [PATCH 04/16] tty: serial: 8250_core: use the ->line argument as a hint in serial8250_find_match_or_unused() Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 05/16] tty: serial: 8250_core: remove UART_IER_RDI in serial8250_stop_rx() Sebastian Andrzej Siewior 2014-09-11 11:19 ` Heikki Krogerus 2014-09-10 19:30 ` [PATCH 06/16] tty: serial: Add 8250-core based omap driver Sebastian Andrzej Siewior 2014-09-11 11:57 ` Peter Hurley 2014-09-16 17:01 ` Sebastian Andrzej Siewior 2014-09-29 9:38 ` Frans Klaver [this message] 2014-09-29 13:27 ` Sebastian Andrzej Siewior 2014-09-29 13:34 ` Frans Klaver 2014-09-10 19:30 ` [PATCH 07/16] tty: serial: 8250_dma: handle error on TX submit Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 08/16] tty: serial: 8250_dma: enqueue RX dma again on completion Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx Sebastian Andrzej Siewior 2014-09-11 11:17 ` Heikki Krogerus 2014-09-11 11:42 ` Sebastian Andrzej Siewior 2014-09-11 12:32 ` Peter Hurley 2014-09-11 12:50 ` Sebastian Andrzej Siewior 2014-09-11 14:35 ` Peter Hurley 2014-09-15 17:01 ` Sebastian Andrzej Siewior 2014-09-16 16:55 ` Sebastian Andrzej Siewior 2014-09-17 12:20 ` Peter Hurley 2014-09-17 16:25 ` Sebastian Andrzej Siewior 2014-09-29 16:15 ` Sebastian Andrzej Siewior 2014-09-11 15:11 ` Frans Klaver 2014-09-11 16:04 ` Sebastian Andrzej Siewior 2014-09-11 17:04 ` Frans Klaver 2014-09-12 7:23 ` Sebastian Andrzej Siewior [not found] ` <20140912094010.GE28458@ci00147.xsens-tech.local> 2014-09-12 9:51 ` Sebastian Andrzej Siewior 2014-09-12 10:28 ` Frans Klaver 2014-09-15 16:42 ` Sebastian Andrzej Siewior 2014-09-16 9:05 ` Frans Klaver 2014-09-16 12:42 ` Frans Klaver 2014-09-16 14:23 ` Frans Klaver 2014-09-17 10:28 ` Frans Klaver 2014-09-21 20:41 ` Sebastian Andrzej Siewior 2014-09-22 9:28 ` Frans Klaver 2014-09-24 7:56 ` Sebastian Andrzej Siewior 2014-09-25 15:14 ` Sebastian Andrzej Siewior 2014-09-25 15:18 ` Frans Klaver 2014-09-29 8:50 ` Frans Klaver 2014-09-29 9:54 ` Sebastian Andrzej Siewior 2014-09-29 10:30 ` Frans Klaver 2014-09-30 8:44 ` Frans Klaver 2014-10-02 10:27 ` Sebastian Andrzej Siewior 2014-10-13 14:55 ` Frans Klaver 2014-09-23 17:03 ` Peter Hurley 2014-09-24 7:53 ` Sebastian Andrzej Siewior 2014-09-25 10:42 ` Sebastian Andrzej Siewior 2014-09-25 11:31 ` Peter Hurley 2014-09-25 13:11 ` Sebastian Andrzej Siewior 2014-09-17 16:34 ` Sebastian Andrzej Siewior 2014-09-19 10:22 ` Heikki Krogerus 2014-09-19 10:58 ` Sebastian Andrzej Siewior 2014-09-19 11:25 ` Peter Hurley 2014-09-22 7:46 ` Heikki Krogerus 2014-09-25 9:24 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 10/16] tty: serial: 8250_dma: optimize the xmit path due to UART_BUG_DMA_TX Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 11/16] tty: serial: 8250_dma: keep own book keeping about RX transfers Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 12/16] tty: serial: 8250_dma: handle the UART RDI event while DMA remains idle Sebastian Andrzej Siewior 2014-09-29 9:23 ` Frans Klaver 2014-09-10 19:30 ` [PATCH 13/16] tty: serial: 8250_dma: add pm runtime Sebastian Andrzej Siewior 2014-09-29 9:26 ` Frans Klaver 2014-09-29 9:56 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 14/16] arm: dts: am33xx: add DMA properties for UART Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 15/16] arm: dts: dra7: " Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 16/16] tty: serial: 8250: omap: add dma support Sebastian Andrzej Siewior 2014-09-12 22:43 ` [PATCH 00/16 v9] omap 8250 based uart + DMA Tony Lindgren 2014-09-15 11:50 ` Sebastian Andrzej Siewior 2014-09-16 12:57 ` Sebastian Andrzej Siewior 2014-09-16 16:48 ` Tony Lindgren 2014-09-16 21:30 ` Tony Lindgren 2014-09-17 8:38 ` Sebastian Andrzej Siewior 2014-09-17 9:05 ` Sebastian Andrzej Siewior 2014-09-26 16:02 ` Greg KH
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