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2024-01-26hw/char/imx_serial: Implement receive FIFO and ageing timerRayhan Faizel
This patch implements a 32 half word FIFO as per imx serial device specifications. If a non empty FIFO is below the trigger level, an ageing timer will tick for a duration of 8 characters. On expiry, AGTIM will be set triggering an interrupt. AGTIM timer resets when there is activity in the receive FIFO. Otherwise, RRDY is set when trigger level is exceeded. The receive trigger level is 8 in newer kernel versions and 1 in older ones. This change will break migration compatibility for the imx boards. Signed-off-by: Rayhan Faizel <rayhan.faizel@gmail.com> Message-id: 20240125151931.83494-1-rayhan.faizel@gmail.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> [PMM: commit message tidyups] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2023-06-19imx_serial: set wake bit when we receive a data byteMartin Kaiser
The Linux kernel added a flood check for RX data recently in commit 496a4471b7c3 ("serial: imx: work-around for hardware RX flood"). This check uses the wake bit in the UART status register 2. The wake bit indicates that the receiver detected a start bit on the RX line. If the kernel sees a number of RX interrupts without the wake bit being set, it treats this as spurious data and resets the UART port. imx_serial does never set the wake bit and triggers the kernel's flood check. This patch adds support for the wake bit. wake is set when we receive a new character (it's not set for break events). It seems that wake is cleared by the kernel driver, the hardware does not have to clear it automatically after data was read. The wake bit can be configured as an interrupt source. Support this mechanism as well. Co-developed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Martin Kaiser <martin@kaiser.cx> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-09-18Use OBJECT_DECLARE_SIMPLE_TYPE when possibleEduardo Habkost
This converts existing DECLARE_INSTANCE_CHECKER usage to OBJECT_DECLARE_SIMPLE_TYPE when possible. $ ./scripts/codeconverter/converter.py -i \ --pattern=AddObjectDeclareSimpleType $(git grep -l '' -- '*.[ch]') Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Acked-by: Paul Durrant <paul@xen.org> Message-Id: <20200916182519.415636-6-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-09-09Use DECLARE_*CHECKER* macrosEduardo Habkost
Generated using: $ ./scripts/codeconverter/converter.py -i \ --pattern=TypeCheckMacro $(git grep -l '' -- '*.[ch]') Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-12-ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-13-ehabkost@redhat.com> Message-Id: <20200831210740.126168-14-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-09-09Move QOM typedefs and add missing includesEduardo Habkost
Some typedefs and macros are defined after the type check macros. This makes it difficult to automatically replace their definitions with OBJECT_DECLARE_TYPE. Patch generated using: $ ./scripts/codeconverter/converter.py -i \ --pattern=QOMStructTypedefSplit $(git grep -l '' -- '*.[ch]') which will split "typdef struct { ... } TypedefName" declarations. Followed by: $ ./scripts/codeconverter/converter.py -i --pattern=MoveSymbols \ $(git grep -l '' -- '*.[ch]') which will: - move the typedefs and #defines above the type check macros - add missing #include "qom/object.h" lines if necessary Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-9-ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-10-ehabkost@redhat.com> Message-Id: <20200831210740.126168-11-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2018-08-20imx_serial: Generate interrupt on receive data ready if enabledHans-Erik Floryd
Generate an interrupt if USR2_RDR and UCR4_DREN are both set. Signed-off-by: Hans-Erik Floryd <hans-erik.floryd@rt-labs.com> Message-id: 1534341354-11956-1-git-send-email-hans-erik.floryd@rt-labs.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-03-23i.MX: Support serial RS-232 break properlyTrent Piepho
Linux does not detect a break from this IMX serial driver as a magic sysrq. Nor does it note a break in the port error counts. The former is because the Linux driver uses the BRCD bit in the USR2 register to trigger the RS-232 break handler in the kernel, which is where sysrq hooks in. The emulated UART was not setting this status bit. The latter is because the Linux driver expects, in addition to the BRK bit, that the ERR bit is set when a break is read in the FIFO. A break should also count as a frame error, so add that bit too. Cc: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Trent Piepho <tpiepho@impinj.com> Message-id: 20180320013657.25038-1-tpiepho@impinj.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-03-19char: i.MX: Add support for "TX complete" interruptAndrey Smirnov
Add support for "TX complete"/TXDC interrupt generate by real HW since it is needed to support guests other than Linux. Based on the patch by Bill Paul as found here: https://bugs.launchpad.net/qemu/+bug/1753314 Cc: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org Cc: Bill Paul <wpaul@windriver.com> Cc: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Bill Paul <wpaul@windriver.com> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Message-id: 20180315191141.6789-2-andrew.smirnov@gmail.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-06-02char: move CharBackend handling in char-fe unitMarc-André Lureau
Move all the frontend struct and methods to a seperate unit. This avoids accidentally mixing backend and frontend calls, and helps with readabilty. Make qemu_chr_replay() a macro shared by both char and char-fe. Export qemu_chr_write(), and use a macro for qemu_chr_write_all() (nb: yes, CharBackend is for char frontend :) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
2017-06-02chardev: move headers to include/chardevMarc-André Lureau
So they are all in one place. The following patch will move serial & parallel declarations to the respective headers. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
2016-10-24char: replace PROP_CHR with CharBackendMarc-André Lureau
Store the property in a CharBackend instead of CharDriverState*. This also replace systematically chr by chr.chr to access the CharDriverState*. The following patches will replace it with calls to qemu_chr_fe CharBackend functions. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-12-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-08-13i.MX: Split UART emulator in a header file and a source fileJean-Christophe Dubois
Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Message-id: a51ef50fa222a614169056d5389a6d3ed6a63b04.1437080501.git.jcd@tribudubois.net Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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