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Minimal requirements to run L4linux using only a serial console
by Masti Ramya Jayaram 30 Aug '14

30 Aug '14

Dear all, I am trying to run L4linux on fiasco/l4re but with the keyboard and VGA disabled. I can get all the way to the command prompt (of the shell) in the initramfs but then, on pressing a key, I get a page fault and I cannot debug the system anymore using the serial_esc. I suspect it is my configuration which I have provided below. I was wondering what the minimal packages are to achieve this. modules.list: entry l4linux kernel fiasco -serial_esc -freq=533000 roottask moe rom/l4linux.cfg module l4re module ned module l4linux.cfg module io module vmlinuz module drops-rd.rd I have disabled the framebuffer and input server in the L4linux stub drivers configuration and enabled the serial console. l4linux.cfg: --vim:set ft=lua: L4.default_loader:start({ caps = { log = L4.Env.log:m("rws"), }, l4re_dbg = L4.Dbg.Warn, log = { "l4linux", "yellow" }, }, "rom/io -vvvv rom/vmlinuz mem=64M console=ttyLv0 l4x_rd=rom/drops-rd.rd root=1:0 ramdisk$ I also specify a custom frequency for my board to fiasco.oc, do I have to make similar modifications to l4linux (e.g., Timer frequency)? Thanks, Ramya

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RE: Minimal requirements to run L4linux using only a serial console
by Masti Ramya Jayaram 29 Aug '14

29 Aug '14

Hi Martin, That was a very useful tip. I simply changed the default value in kernel/fiasco/src/kern/config.cpp from SERIAL_ESC_IRQ to SERIAL_ESC_NOIRQ which leads to polling (I am guessing) and voila! It works! I even tried on the actual SCC and it works! I can break into the debugger as well as input to l4linux. Thanks a lot for your help for your help. Best, Ramya ________________________________________ From: Masti Ramya Jayaram Sent: 29 August 2014 17:48 To: Martin Schröder; l4-hackers(a)os.inf.tu-dresden.de Subject: RE: Minimal requirements to run L4linux using only a serial console Also with acpi on, it does enter the debugger in qemu. Best, Ramya ________________________________________ From: Masti Ramya Jayaram Sent: 29 August 2014 17:45 To: Martin Schröder; l4-hackers(a)os.inf.tu-dresden.de Subject: RE: Minimal requirements to run L4linux using only a serial console Hey Martin, No I just realized that ESC does not break into the debugger. But I can clearly see that the process instead of printing "Hello world" prints "ello World" :) What could the reason be? Thanks, Ramya ________________________________________ From: l4-hackers [l4-hackers-bounces(a)os.inf.tu-dresden.de] on behalf of Martin Schröder [martin.schroeder(a)openlimit.com] Sent: 29 August 2014 17:35 To: l4-hackers(a)os.inf.tu-dresden.de Subject: Re: Minimal requirements to run L4linux using only a serial console Hi Ramya, a: No, its not a must. The UART could also be polled (by a timer) to see if something arrived. b: At least regarding l4linux there is nothing more to it - afaik. But let's go back to the hello word example on the SCC. What happens if you press the <ESC> key? Does it break into the JDB debugger? Best regards, Martin Am 29.08.2014 um 16:56 schrieb Masti Ramya Jayaram: > Hey Martin, > > I am trying to run l4linux/fiasco on the Intel SCC which does have a pic-8259. The Intel SCC does not have a BIOS and does not have any ACPI tables which I think qemu generates on the fly. It also does not use a Screen or keyboard. > > I obtained a patch from Markus Partheymueller which they used to boot fiasco on the SCC. With it I am able to run hello world both in qemu with no-acpi as well as on the SCC successfully. > > The patch to the best of my knowledge does the following: > > a. Makes the cmdline also parse an argument so that the frequency is an input (533Mhz) > b. Uses the apic timer for scheduling. > c. Disables the pic-8259 because it does not exist. Instead the core in the SCC has two interrupt lines and this patch initializes these lines as interrupts to the core. > d. Disables keyboard and screen and enables a serial line for communication instead > e. Disables super pages because the SCC does not support it. > > So, when I try the patched fiasco/L4linux on qemu, it works when I do not disable acpi. But since the SCC does not have any ACPI/IO-APIC, when I try to run the same thing on qemu with ACPI off, l4linux boots but is not responsive to input. > > In short: > > when I run with I (below) , my l4linux responds to input and with II (below) not. > > qemu-system-i386 -m 256 -serial stdio -kernel bootstrap_l4linux.elf -append "-arg=fiasco,,-serial_esc -freq=533000" > > qemu-system-i386 -no-acpi -m 256 -serial stdio -kernel bootstrap_l4linux.elf -append "-arg=fiasco,,-serial_esc -freq=533000" > > Now the question is: > > a. Is the IO-APIC a must for the serial line? > b. Are ACPI tables just a matter of writing data at the right memory locations (e..g, qemu lets you give the acpi-table as input I noticed)? Or is there more to it? > > Thanks for your patience, > ramya > > > ________________________________________ > From: l4-hackers [l4-hackers-bounces(a)os.inf.tu-dresden.de] on behalf of Martin Schröder [martin.schroeder(a)openlimit.com] > Sent: 29 August 2014 16:29 > To: l4-hackers(a)os.inf.tu-dresden.de > Subject: Re: Minimal requirements to run L4linux using only a serial console > > Hi Ramya, > > Why did you disable the PIC? > What is your aim with ACPI and why should this lead to a change in the UART driver? > And what has the serial console to do with ACPI tables? > > For me the topics have at the moment very little in common or I am missing something. > > Best regards, > Martin > > > Am 29.08.2014 um 15:58 schrieb Masti Ramya Jayaram: >> Also, given that the thing works with ACPI on, wouldn't it be better to include ACPI information in the boot instead of changing the driver? Or is this impossible? >> >> Best, >> Ramya >> >> >> ________________________________________ >> From: Masti Ramya Jayaram >> Sent: 29 August 2014 15:55 >> To: Martin Schröder; l4-hackers(a)os.inf.tu-dresden.de >> Subject: RE: Minimal requirements to run L4linux using only a serial console >> >> Hey Martin, >> >> Back on the list ;-) >> >> Ok, I can confirm that when I busy loop during fiasco init, I can actually see the character that I typed. So would I have to change the l4ser driver in Linux or the main driver in under pkg/l4/bootstrap or under fiasco in vkey.cpp? :) >> >> Thanks, >> ramya >> ________________________________________ >> From: Masti Ramya Jayaram >> Sent: 29 August 2014 12:15 >> To: Martin Schröder; l4-hackers(a)os.inf.tu-dresden.de >> Subject: RE: Minimal requirements to run L4linux using only a serial console >> >> Hey Martin, >> >> I cleaned up my build and it worked - the mistake was mine. I had a question regarding ACPI. The target machine I am using has no BIOS/ACPi support. So, when I boot linux on it my console input does not work.This is similar to booting in qemu with the -no-acpi option. Serial console output works (I can see the prompt of L4Linux) but input does not. >> >> Is there something special to do when booting with a serial console but no ACPI tables? >> >> Thanks, >> ramya >> ________________________________________ >> From: Martin Schröder [martin.schroeder(a)openlimit.com] >> Sent: 27 August 2014 18:32 >> To: Masti Ramya Jayaram; l4-hackers(a)os.inf.tu-dresden.de >> Subject: Re: Minimal requirements to run L4linux using only a serial console >> >> Hi Masti, >> >> you have all of them already! I did not alter any other file beside the files you already sent. I inserted them into a fresh >> snapshot (http://l4re.org/download/snapshots-oc/l4re-snapshot-2014053111.tar.xz) and started building. Since "drops-rd.rd" was not >> found in the snapshot, I just renamed "ramdisk-x86.rd" to "drops-rd.rd". Nothing more. >> >> Martin >> >> >> >> Am 27.08.2014 um 18:02 schrieb Masti Ramya Jayaram: >>> Hey Martin, >>> >>> thanks for the quick response. Could you send me your configs (l4linux, fiasco, l4re) so that I can try it with that? >>> >>> Thanks, >>> Ramya >>> ________________________________________ >>> From: l4-hackers [l4-hackers-bounces(a)os.inf.tu-dresden.de] on behalf of Martin Schröder [martin.schroeder(a)openlimit.com] >>> Sent: 27 August 2014 16:28 >>> To: l4-hackers(a)os.inf.tu-dresden.de >>> Subject: Re: Minimal requirements to run L4linux using only a serial console >>> >>> Hi Masti, >>> >>> I just applied your config, replaced "drops-rd.rd" by "ramdisk-x86.rd" and everything (command prompt, debugger) runs fine as >>> expected in Qemu. Maybe you ran into a similar problem as described in this thread: >>> >>> http://os.inf.tu-dresden.de/pipermail/l4-hackers/2012/thread.html#5165 >>> >>> >>> Best regards, >>> Martin >>> >>> >>> Am 27.08.2014 um 15:18 schrieb Masti Ramya Jayaram: >>>> Sorry, a couple of typos in the l4linux.cfg >>>> --vim:set ft=lua: >>>> >>>> >>>> L4.default_loader:start({ caps = { >>>> log = L4.Env.log:m("rws"), >>>> }, >>>> l4re_dbg = L4.Dbg.Warn, >>>> log = { "l4linux", "yellow" }, >>>> }, "rom/vmlinuz mem=64M console=ttyLv0 l4x_rd=rom/drops-rd.rd root=1:0 ramdisk_size=4000 l4ser.vkey_enable=1"); >>>> >>>> Thanks in advance, >>>> ramya >>>> >>>> ________________________________________ >>>> From: l4-hackers [l4-hackers-bounces(a)os.inf.tu-dresden.de] on behalf of Masti Ramya Jayaram [rmasti(a)inf.ethz.ch] >>>> Sent: 27 August 2014 14:07 >>>> To: l4-hackers(a)os.inf.tu-dresden.de >>>> Subject: Minimal requirements to run L4linux using only a serial console >>>> >>>> Dear all, >>>> >>>> I am trying to run L4linux on fiasco/l4re but with the keyboard and VGA disabled. I can get all the way to the command prompt (of the shell) in the initramfs but then, on pressing a key, I get a page fault and I cannot debug the system anymore using the serial_esc. I suspect it is my configuration which I have provided below. I was wondering what the minimal packages are to achieve this. >>>> >>>> modules.list: >>>> entry l4linux >>>> kernel fiasco -serial_esc -freq=533000 >>>> roottask moe rom/l4linux.cfg >>>> module l4re >>>> module ned >>>> module l4linux.cfg >>>> module io >>>> module vmlinuz >>>> module drops-rd.rd >>>> >>>> I have disabled the framebuffer and input server in the L4linux stub drivers configuration and enabled the serial console. >>>> >>>> l4linux.cfg: >>>> >>>> --vim:set ft=lua: >>>> >>>> L4.default_loader:start({ caps = { >>>> log = L4.Env.log:m("rws"), >>>> }, >>>> l4re_dbg = L4.Dbg.Warn, >>>> log = { "l4linux", "yellow" }, >>>> }, "rom/io -vvvv rom/vmlinuz mem=64M console=ttyLv0 l4x_rd=rom/drops-rd.rd root=1:0 ramdisk$ >>>> >>>> >>>> I also specify a custom frequency for my board to fiasco.oc, do I have to make similar modifications to l4linux (e.g., Timer frequency)? >>>> >>>> Thanks, >>>> Ramya _______________________________________________ l4-hackers mailing list l4-hackers(a)os.inf.tu-dresden.de http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers

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Re: Minimal requirements to run L4linux using only a serial console
by Martin Schröder 29 Aug '14

29 Aug '14

Hi Ramya, Am 29.08.2014 um 14:29 schrieb Masti Ramya Jayaram: > Hi Martin, > > Thanks for checking that. I also see that my build works provided I don't apply a special patch meant for my board (Intel SCC). The patch essentially only alters the frequency and disables the PIC. If you disable the PIC you won't get any character into your system since UART reception is normally interrupt based. If you want to change this you have to poll the UART FIFO in the driver every second or so if there is any character available. Best regards, Martin.

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Re: advice on using ddelinux
by Björn Döbel 28 Aug '14

28 Aug '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 28.08.2014 12:14, Korbinian Ederer wrote: > Yes the symlinks are build properly, but you're right with the > CFlags. The include dir is not listed. How do I tell the make > process to do so? My bad, the variable is called PRIVATE_INCDIR as you can see in all the example Makefiles around the l4/pkg/dde subdirectory. Cheers, Bjoern - -- Dipl.-Inf. Bjoern Doebel Mail: doebel(a)tudos.org TU Dresden, OS Chair Phone: +49 351 463 38 799 Noethnitzer Str. 46 Fax: +49 351 463 38 284 01187 Dresden, Germany WWW: http://www.tudos.org/~doebel - -- "When the seagulls follow the trawler, it's because they think sardines will be thrown into the sea." (Eric Cantona) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlP/E0sACgkQP5ijxgQLUNmhTgCfbaw/Y+IIysCiwasxjvuVSxEP BdkAoJWEcSHWRfTedvXj0VotJv+1zVvn =o8Pq -----END PGP SIGNATURE-----

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Re: Mapping memory into process address space
by Noah Zentzis 28 Aug '14

28 Aug '14

On 08/17/2014 12:55 AM, Adam Lackorzynski wrote: > So now I'm not sure how you want to proceed. Are your programs special > ones, i.e. that they are quite different from L4 programs or are they L4 > programs? I wondering where to do the paging, however, in any case it > sounds to me like doing it in a different task would be good. > > To address your question: > You map the pager to the task with the dst_task->map() call as shown > above. The pager is probably a thread you implement, for doing your > work. The order does not really matter because the thread only starts > running until the run_thread call, i.e. it does not matter whether the > pager cap (any cap) is mapped before or after it has been registered > with the thread. How would I configure the new task to use the same pager that the current task is? Looking at libloader, I'd think it would be something like: task-map(L4Re::This_task, env->rm().fpage(), env->rm().snd_base()); but I'm not sure if I need to create a new region map or something like that. I think I've got memory mapping working, but the process dies with an unhandled read page fault. - Noah Zentzis

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GPIO Interrupt on L4Linux
by Yunchuan Geng 28 Aug '14

28 Aug '14

Hi, L4 hackers I am implementing a driver using GPIO input as interrupt. When setup handler for gpio, either from "irq_set_chained_handler()" or "requst_irq()" in kernel driver, it finally calls "l4lx_irq_io_startup()" function and return "/l4x-irq: Failed to set type for IRQ x".// / What this error means? Right before this error, it called l4_icu_set_mode() which goes to l4 side, I tried to print out debug information in l4 side, but not very successful. I tried read document about ICU and IRQ handling library about L4Re, but did not find the answer, maybe I overlook it. So I ask help here. Is there an guidance about this interrupt things or could some one please give me some advice. Best Regards, -Yunchuan

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Fiasco, L4Re, L4linux for Pentium 5
by Masti Ramya Jayaram 28 Aug '14

28 Aug '14

Dear all, I am trying to run L4linux on top of fiasco/L4re using an older version from the svn (for those interested, I am trying to run this on Intel SCC and therefore need an old build). I am first trying to run this on qemu and can get the entire linux to boot and display a shell prompt. However, I get a pagefault on trying to enter a character on the shell prompt as below: ........... Switching to clocksource tsc VFS: Mounted root (ext2 filesystem) on device 1:0. Doing post... Freeing unused kernel memory: 164k freed # l4linux | cpu0: utcb=0xb3000600 416 l4linux | l4lx_thread_create: Created thread 423 (idler0) (u:b3000c00, sp:006a1ff8) l4linux | Page fault: addr = 000003f2 pc = 004f34dc (rw) l4linux | Page fault (non-resolved): pfa=3f2 pc=4f34dc ........... I can verify that the first character typed at the prompt reaches the fiasco kernel (because I can echo it). I am not sure how exactly this (tries to) reach L4linux from there on. Note that I have VGA and keyboards disabled and I am trying to use only the serial line for input and output. Has anyone had similar problems before? Any help on how to proceed would be great! best, ramya

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Device Tree Blob support in l4linux
by Martin Schröder 28 Aug '14

28 Aug '14

On my board I want to add support for GPIO. The relevant drivers rely on the pinctrl configuration stored in a Device Tree Blob. So I exposed the memory regions and IRQs to the l4linux task, enabled CONFIG_ARM_APPEND_DTB=y, CONFIG_ARM_DTB_COMPAT=y, CONFIG_USE_OF=y, compiled the dts (from a native linux build) and added it to moe but without any success. Unfortunately I did not find any references nor any examples how someone can provide a Device Tree Blob to l4linux. Has anybody ever managed to get l4linux running with DTB support? Best regards Martin Schröder.

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Re: advice on using ddelinux
by Björn Döbel 28 Aug '14

28 Aug '14

Am 27.08.2014 um 17:02 schrieb Korbinian Ederer: > Hello, > > thanks for the fast response. > > now I've created the include dir in the pkg/d_can folder. Then I added > the PRIVATE_INC_DIR variable in the Makefile of the driver, but I > still get the file not found error... What I'm doing wrong? From your description ... I don't know! * Are the include files installed into your build directory? (Do a find within <builddir>/include). * Does your compile run use the proper -I flags to get to these include dirs? (Do a make run with the V=1 option) Bjoern > > the directory structur now looks like this: > > l4/pkg/dcan/: > -dcan/: > -driver C Files > -Makefile with the PRIVATE_INC_DIR variable > -include/: > -linux/: > -can/: > - the additional header files > > thanks > > Korbinian > > Am 26.08.2014 um 14:09 schrieb Björn Döbel: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> On 26.08.2014 13:54, Korbinian Ederer wrote: >>> Hello together, I just started to play with ddelinux... My Goal is >>> to build an d_can driver for l4re. >> Do you want to implement your own driver from scratch? In that case, >> I'd recommend not using any Linux functionality and instead build the >> driver on top of the respective L4Re services or using libddekit, >> which provides convenience wrappers for this functionality. >> >> If you are reusing a Linux driver, DDE might be the right way to go. >> Note, that pkg/dde/linux26 is still at Linux version 2.6.29 and you >> will have to use the respective driver from this version to fit with >> DDE. Otherwise you'll likely run into interface mismatches. >> >>> I tried to collect the important parts from the Makefiles of >>> pkg/anghk and the ddelinux examples to write my own for d_can. >>> >>> when i Try to build my "puzzle" ;) i get following error: >>> fiasco/src/l4/pkg/d_can/d_can/d_can.c:42:27: fatal error: >>> linux/can/dev.h: No such file or directory this leads me to the >>> fear that there's no can/dev.h in ddelinux... >> If there's no linux/can/dev.h in ddelinux, you will probably have to >> add it either to l4/pkg/dde/linux26 or to your own pkg directory. >> >> In any case, you put the missing header files into some place and then >> use L4Re's build system to install the headers properly and to find >> them while compiling your applications. >> >> * An example for installing headers can be found in >> pkg/dde/linux26/include/Makefile >> >> * All DDE drivers are supposed to include pkg/dde/linux26/Makeconf >> in their Makefile. This file sets up a Linux-specific compile >> environment. For the case of your additional headers you would >> include this file and then add your newly created private header >> dir to the PRIVATE_INC_DIR make variable. >> >>> PS: Sorry for the large appendix, but I think it's important for >>> the problem. >>> >>> >>> >>> my pkg folder structure looks like this: >>> >>> l4/pkg/d_can: -./Control -./Makefile -d_can/: -./d_can.c >>> -./d_dcan.h -./d_can_platform.c -./Kconfig -./Makefile >> What would you need the Kconfig file for? >> >> >>> The contents of the files: >>> >>> l4/pkg/d_can/Control: >>> >>> /provides: d_can// //requires: dde-linux26 dde-linux26_net/ / / >>> >>> >>> >>> >>> l4/pkg/d_can/Makefile:/ // //PKGDIR ?= .// //L4DIR ?= >>> $(PKGDIR)/../..// // //include $(L4DIR)/mk/Makeconf// //-include >>> $(PKGDIR_OBJ)/Makeconf// // //#ifeq ($(CONFIG_DDE26),y)// //TARGET >>> = d_can// //#endif// // //include $(L4DIR)/mk/subdir.mk/ >> I think there's no need for the CONFIG_DDE26 check? >> >> >> Bjoern >> >> - -- Dipl.-Inf. Bjoern Doebel Mail: doebel(a)tudos.org >> TU Dresden, OS Chair Phone: +49 351 463 38 799 >> Noethnitzer Str. 46 Fax: +49 351 463 38 284 >> 01187 Dresden, Germany WWW: http://www.tudos.org/~doebel >> - -- >> "When the seagulls follow the trawler, it's because they think >> sardines will be thrown into the sea." (Eric Cantona) >> -----BEGIN PGP SIGNATURE----- >> Version: GnuPG v1 >> >> iEYEARECAAYFAlP8ePMACgkQP5ijxgQLUNnsJwCglKDQZqjNNlQ+LBdGP1J66QaE >> Y0oAn1KoejkjDIr5jF17oKMwqvBW0bWA >> =joNi >> -----END PGP SIGNATURE----- >> >> _______________________________________________ >> l4-hackers mailing list >> l4-hackers(a)os.inf.tu-dresden.de >> http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers >

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advice on using ddelinux
by Korbinian Ederer 26 Aug '14

26 Aug '14

Hello together, I just started to play with ddelinux... My Goal is to build an d_can driver for l4re. I tried to collect the important parts from the Makefiles of pkg/anghk and the ddelinux examples to write my own for d_can. when i Try to build my "puzzle" ;) i get following error: fiasco/src/l4/pkg/d_can/d_can/d_can.c:42:27: fatal error: linux/can/dev.h: No such file or directory this leads me to the fear that there's no can/dev.h in ddelinux... My questions at this point are: -Am I working in the right direction or did I misunderstand the concept of ddelinux? -If not, what would be the right procedure? Thanks Korbinian Ederer PS: Sorry for the large appendix, but I think it's important for the problem. my pkg folder structure looks like this: l4/pkg/d_can: -./Control -./Makefile -d_can/: -./d_can.c -./d_dcan.h -./d_can_platform.c -./Kconfig -./Makefile The contents of the files: l4/pkg/d_can/Control: /provides: d_can// //requires: dde-linux26 dde-linux26_net/ / / l4/pkg/d_can/Makefile:/ // //PKGDIR ?= .// //L4DIR ?= $(PKGDIR)/../..// // //include $(L4DIR)/mk/Makeconf// //-include $(PKGDIR_OBJ)/Makeconf// // //#ifeq ($(CONFIG_DDE26),y)// //TARGET = d_can// //#endif// // //include $(L4DIR)/mk/subdir.mk/ l4/d_can/d_can/d_can.c: //* * CAN bus driver for Bosch D_CAN controller * * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ * Anil Kumar Ch <anilkumar(a)ti.com> * * Borrowed from C_CAN driver * Copyright (C) 2010 ST Microelectronics * - Bhupesh Sharma <bhupesh.sharma(a)st.com> * * Borrowed heavily from the C_CAN driver originally written by: * Copyright (C) 2007 * - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer(a)pengutronix.de> * - Simon Kallweit, intefo AG <simon.kallweit(a)intefo.ch> * * Bosch D_CAN controller is compliant to CAN protocol version 2.0 part A and B. * Bosch D_CAN user manual can be obtained from: * http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/can/ * d_can_users_manual_111.pdf * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/netdevice.h> #include <linux/if_arp.h> #include <linux/if_ether.h> #include <linux/list.h> #include <linux/io.h> #include <linux/can.h> #include <linux/can/dev.h> #include <linux/can/error.h> #include "d_can.h" /* TI D_CAN module registers */ #define D_CAN_CTL 0x0 /* CAN control register */ #define D_CAN_ES 0x4 /* Error and status */ #define D_CAN_PARITYERR_EOI 0x4 /* Parity error EOI */ #define D_CAN_ERRC 0x8 /* Error counter */ #define D_CAN_BTR 0xC /* Bit timing */ #define D_CAN_INT 0x10 /* Interrupt register */ #define D_CAN_TEST 0x14 /* Test register */ #define D_CAN_PERR 0x1C /* Parity Error Code */ #define D_CAN_ABOTR 0x80 /* Auto-Bus-On Time */ #define D_CAN_TXRQ_X 0x84 /* Transmission Request X */ #define D_CAN_TXRQ(n) (0x88 + ((n) * 4)) /* Transmission request */ #define D_CAN_NWDAT_X 0x98 /* New data X register */ #define D_CAN_NWDAT(n) (0x9C + ((n) * 4)) /* New data */ #define D_CAN_INTPND_X 0xAC /* Interrupt Pending X */ #define D_CAN_INTPND(n) (0xB0 + ((n) * 4)) /* Interrupt Pending */ #define D_CAN_MSGVAL_X 0xC0 /* Message Valid X */ #define D_CAN_MSGVAL(n) (0xC4 + ((n) * 4)) /* Message Valid */ #define D_CAN_INTMUX(n) (0xD8 + ((n) * 4)) /* Interrupt Multiplexer */ #define D_CAN_IFCMD(n) (0x100 + ((n) * 0x20)) /* Command */ #define D_CAN_IFMSK(n) (0x104 + ((n) * 0x20)) /* Mask */ #define D_CAN_IFARB(n) (0x108 + ((n) * 0x20)) /* Arbitration */ #define D_CAN_IFMCTL(n) (0x10c + ((n) * 0x20)) /* Message ctl */ #define D_CAN_IFDATA(n) (0x110 + ((n) * 0x20)) /* DATA A */ #define D_CAN_IFDATB(n) (0x114 + ((n) * 0x20)) /* DATA B */ #define D_CAN_IF3OBS 0x140 /* IF3 Observation */ #define D_CAN_IF3UPD(n) (0x160 + ((n) * 4)) /* Update enable */ #define D_CAN_TIOC 0x1E0 /* CAN TX IO Control */ #define D_CAN_RIOC 0x1E4 /* CAN RX IO Control */ /* Control register Bit fields */ #define D_CAN_CTL_WUBA BIT(26) /* Automatic wake-up on bus activity */ #define D_CAN_CTL_PDR BIT(24) /* Request for local low power mode */ #define D_CAN_CTL_DE3 BIT(20) /* Enable DMA request line for IF3 */ #define D_CAN_CTL_DE2 BIT(19) /* Enable DMA request line for IF2 */ #define D_CAN_CTL_DE1 BIT(18) /* Enable DMA request line for IF1 */ #define D_CAN_CTL_IE1 BIT(17) /* Interrupt line 1 enable */ #define D_CAN_CTL_INITDBG BIT(16) /* Init state for debug access */ #define D_CAN_CTL_SWR BIT(15) /* S/W reset enable */ #define D_CAN_CTL_PMD (0xF << 10) /* Parity on/off */ #define D_CAN_CTL_ABO BIT(9) /* Auto bus on enable */ #define D_CAN_CTL_IDS BIT(8) /* Interruption debug support enable */ #define D_CAN_CTL_TEST BIT(7) /* Test mode enable */ #define D_CAN_CTL_CCE BIT(6) /* Configuration change enable */ #define D_CAN_CTL_DISABLE_AR BIT(5) /* Disable automatic retransmission */ #define D_CAN_CTL_ENABLE_AR (0 << 5) #define D_CAN_CTL_EIE BIT(3) /* Error interrupt enable */ #define D_CAN_CTL_SIE BIT(2) /* Status change int enable */ #define D_CAN_CTL_IE0 BIT(1) /* Interrupt line 0 enable */ #define D_CAN_CTL_INIT BIT(0) /* D_CAN initialization mode */ /* D_CAN Error and Status and Parity Error EOI reg bit fields */ #define D_CAN_ES_PDA BIT(10) /* Local power-down ACK */ #define D_CAN_ES_WUP BIT(9) /* Wkae up pending */ #define D_CAN_ES_PER BIT(8) /* Parity error detected */ #define D_CAN_ES_BOFF BIT(7) /* Bus off state */ #define D_CAN_ES_EWARN BIT(6) /* Warning state */ #define D_CAN_ES_EPASS BIT(5) /* Error passive state */ #define D_CAN_ES_RXOK BIT(4) /* Received a msg successfully */ #define D_CAN_ES_TXOK BIT(3) /* Transmitted a msg successfully */ #define D_CAN_ES_LEC_MASK 0x7 /* Last error code */ /* Parity error reg bit fields */ #define D_CAN_PEEOI BIT(8) /* EOI indication for parity error */ /* Error counter reg bit fields */ #define D_CAN_ERRC_RP_SHIFT 15 #define D_CAN_ERRC_RP_MASK BIT(15) /* Receive error passive */ #define D_CAN_ERRC_REC_SHIFT 8 #define D_CAN_ERRC_REC_MASK (0x7F << 8) /* Receive err counter */ #define D_CAN_ERRC_TEC_SHIFT 0 #define D_CAN_ERRC_TEC_MASK (0xFF << 0) /* Transmit err counter */ /* Bit timing reg bit fields */ #define D_CAN_BTR_BRPE_SHIFT 16 #define D_CAN_BTR_BRPE_MASK (0xF << 16) /* Baud rate prescaler ext */ #define D_CAN_BTR_TSEG2_SHIFT 12 #define D_CAN_BTR_TSEG2_MASK (0x7 << 12) /* Time seg after smpl point */ #define D_CAN_BTR_TSEG1_SHIFT 8 #define D_CAN_BTR_TSEG1_MASK (0xF << 8) /* Time seg before smpl point */ #define D_CAN_BTR_SJW_SHIFT 6 #define D_CAN_BTR_SJW_MASK (0x3 << 6) /* Syncronization jump width */ #define D_CAN_BTR_BRP_SHIFT 0 #define D_CAN_BTR_BRP_MASK (0x3F << 0) /* Baud rate prescaler */ /* D_CAN Test register bit fields */ #define D_CAN_TEST_RDA BIT(9) /* RAM direct access enable */ #define D_CAN_TEST_EXL BIT(8) /* External loopback mode */ #define D_CAN_TEST_RX BIT(7) /* Monitors the reveive pin */ #define D_CAN_TEST_TX (0x3 << 5) /* Control of CAN_TX pin */ #define D_CAN_TEST_LBACK BIT(4) /* Loopback mode */ #define D_CAN_TEST_SILENT BIT(3) /* Silent mdoe */ /* D_CAN Parity error reg bit fields */ #define D_CAN_PERR_WN_MASK (0x7 << 8) /* Parity error word nuber */ #define D_CAN_PERR_MN_MASK 0xFF /* Parity error msg object */ /* D_CAN X registers bit fields */ #define D_CAN_BIT_FIELD(n) (0x3 << (2 * n)) /* X reg's bit field 1 mask */ /* D_CAN IF command reg bit fields */ #define D_CAN_IF_CMD_WR BIT(23) /* Write/read */ #define D_CAN_IF_CMD_MASK BIT(22) /* Access to mask bits */ #define D_CAN_IF_CMD_ARB BIT(21) /* Access to arbitration bits */ #define D_CAN_IF_CMD_CONTROL BIT(20) /* Acess to control bits */ #define D_CAN_IF_CMD_CIP BIT(19) /* Clear int pending */ #define D_CAN_IF_CMD_TXRQST BIT(18) /* Access transmission request */ #define D_CAN_IF_CMD_DATAA BIT(17) /* Access to Data Bytes 0-3 */ #define D_CAN_IF_CMD_DATAB BIT(16) /* Access to Data Bytes 4-7 */ #define D_CAN_IF_CMD_BUSY BIT(15) /* Busy flag */ #define D_CAN_IF_CMD_DAM BIT(14) /* Activation of DMA */ #define D_CAN_IF_CMD_MN_MASK 0xFF /* No. of msg's used for DMA T/F */ #define D_CAN_IF_CMD_ALL (D_CAN_IF_CMD_MASK | D_CAN_IF_CMD_ARB | \ D_CAN_IF_CMD_CONTROL | D_CAN_IF_CMD_TXRQST | \ D_CAN_IF_CMD_DATAA | D_CAN_IF_CMD_DATAB) /* D_CAN IF mask reg bit fields */ #define D_CAN_IF_MASK_MX BIT(31) /* Mask Extended Identifier */ #define D_CAN_IF_MASK_MD BIT(30) /* Mask Message direction */ /* D_CAN IF Arbitration */ #define D_CAN_IF_ARB_MSGVAL BIT(31) /* Message Vaild */ #define D_CAN_IF_ARB_MSGXTD BIT(30) /* Extended Identifier 0-11 1-29 */ #define D_CAN_IF_ARB_DIR_XMIT BIT(29) /* Message direction 0-R 1-T */ /* D_CAN IF Message control */ #define D_CAN_IF_MCTL_NEWDAT BIT(15) /* New data available */ #define D_CAN_IF_MCTL_MSGLST BIT(14) /* Message lost, only for receive */ #define D_CAN_IF_MCTL_CLR_MSGLST (0 << 14) #define D_CAN_IF_MCTL_INTPND BIT(13) /* Interrupt pending */ #define D_CAN_IF_MCTL_UMASK BIT(12) /* Use acceptance mask */ #define D_CAN_IF_MCTL_TXIE BIT(11) /* Transmit int enable */ #define D_CAN_IF_MCTL_RXIE BIT(10) /* Receive int enable */ #define D_CAN_IF_MCTL_RMTEN BIT(9) /* Remote enable */ #define D_CAN_IF_MCTL_TXRQST BIT(8) /* Transmit request */ #define D_CAN_IF_MCTL_EOB BIT(7) /* Data frames */ #define D_CAN_IF_MCTL_DLC_MASK 0xF /* Data length code */ /* D_CAN IF3 Observation reg bit fields */ #define D_CAN_IF3OBS_UP BIT(15) /* Update data status */ #define D_CAN_IF3OBS_SDB BIT(12) /* DataB read out status */ #define D_CAN_IF3OBS_SDA BIT(11) /* DataA read out status */ #define D_CAN_IF3OBS_SC BIT(10) /* Contol bits read out status */ #define D_CAN_IF3OBS_SA BIT(9) /* Arbitration read out status */ #define D_CAN_IF3OBS_SM BIT(8) /* Mask bits read out status */ #define D_CAN_IF3OBS_DB BIT(4) /* Data B read observation */ #define D_CAN_IF3OBS_DA BIT(3) /* Data A read observation */ #define D_CAN_IF3OBS_CTL BIT(2) /* Control read observation */ #define D_CAN_IF3OBS_ARB BIT(1) /* Arbitration data read observation */ #define D_CAN_IF3OBS_MASK BIT(0) /* Mask data read observation */ /* D_CAN TX I/O reg bit fields */ #define D_CAN_TIOC_PU BIT(18) /* CAN_TX pull up/down select */ #define D_CAN_TIOC_PD BIT(17) /* CAN_TX pull disable */ #define D_CAN_TIOC_OD BIT(16) /* CAN_TX open drain enable */ #define D_CAN_TIOC_FUNC BIT(3) /* CAN_TX function */ #define D_CAN_TIOC_DIR BIT(2) /* CAN_TX data direction */ #define D_CAN_TIOC_OUT BIT(1) /* CAN_TX data out write */ #define D_CAN_TIOC_IN BIT(0) /* CAN_TX data in */ /* D_CAN RX I/O reg bit fields */ #define D_CAN_RIOC_PU BIT(18) /* CAN_RX pull up/down select */ #define D_CAN_RIOC_PD BIT(17) /* CAN_RX pull disable */ #define D_CAN_RIOC_OD BIT(16) /* CAN_RX open drain enable */ #define D_CAN_RIOC_FUNC BIT(3) /* CAN_RX function */ #define D_CAN_RIOC_DIR BIT(2) /* CAN_RX data direction */ #define D_CAN_RIOC_OUT BIT(1) /* CAN_RX data out write */ #define D_CAN_RTIOC_IN BIT(0) /* CAN_RX data in */ #define D_CAN_SET_REG 0xFFFFFFFF #define D_CAN_CANMID_IDE BIT(31) /* Extended frame format */ #define D_CAN_CANMID_AME BIT(30) /* Acceptance mask enable */ #define D_CAN_CANMID_AAM BIT(29) /* Auto answer mode */ /* * IF register masks: */ #define IFX_WRITE_IDR(x) ((x) & 0x1FFFFFFF) #define IFX_CMD_BITS(x) ((x) & 0xFFFFFF00) #define IFX_CMD_MSG_NUMBER(x) ((x) & 0xFF) /* Message objects split */ #define D_CAN_NUM_MSG_OBJECTS 64 #define D_CAN_NUM_RX_MSG_OBJECTS 32 #define D_CAN_NUM_TX_MSG_OBJECTS 32 #define D_CAN_MSG_OBJ_RX_FIRST 1 #define D_CAN_MSG_OBJ_RX_LAST (D_CAN_MSG_OBJ_RX_FIRST + \ D_CAN_NUM_RX_MSG_OBJECTS - 1) #define D_CAN_MSG_OBJ_TX_FIRST (D_CAN_MSG_OBJ_RX_LAST + 1) #define D_CAN_MSG_OBJ_TX_LAST (D_CAN_MSG_OBJ_TX_FIRST + \ D_CAN_NUM_TX_MSG_OBJECTS - 1) #define D_CAN_MSG_OBJ_RX_SPLIT 17 #define D_CAN_MSG_OBJ_RX_LOW_LAST (D_CAN_MSG_OBJ_RX_SPLIT - 1) #define D_CAN_NEXT_MSG_OBJ_MASK (D_CAN_NUM_TX_MSG_OBJECTS - 1) /* status interrupt */ #define STATUS_INTERRUPT 0x8000 /* global interrupt masks */ #define ENABLE_ALL_INTERRUPTS 1 #define DISABLE_ALL_INTERRUPTS 0 /* minimum timeout for checking BUSY status */ #define MIN_TIMEOUT_VALUE 6 /* Wait for ~1 sec for INIT bit */ #define D_CAN_WAIT_COUNT 100 #define D_CAN_IF_RX_NUM 0 #define D_CAN_IF_TX_NUM 1 #define D_CAN_GET_XREG_NUM(priv, reg) (__ffs(d_can_read(priv, reg))/4) /* CAN Bittiming constants as per D_CAN specs */ static struct can_bittiming_const d_can_bittiming_const = { .name = D_CAN_DRV_NAME, .tseg1_min = 1, /* Time segment 1 = prop_seg + phase_seg1 */ .tseg1_max = 16, .tseg2_min = 1, /* Time segment 2 = phase_seg2 */ .tseg2_max = 8, .sjw_max = 4, .brp_min = 1, .brp_max = 1024, /* 6-bit BRP field + 4-bit BRPE field*/ .brp_inc = 1, }; /* d_can last error code (lec) values */ enum d_can_lec_type { LEC_NO_ERROR = 0, LEC_STUFF_ERROR, LEC_FORM_ERROR, LEC_ACK_ERROR, LEC_BIT1_ERROR, LEC_BIT0_ERROR, LEC_CRC_ERROR, LEC_UNUSED, }; /* * d_can error types: * Bus errors (BUS_OFF, ERROR_WARNING, ERROR_PASSIVE) are supported */ enum d_can_bus_error_types { D_CAN_NO_ERROR = 0, D_CAN_BUS_OFF, D_CAN_ERROR_WARNING, D_CAN_ERROR_PASSIVE, }; static inline void d_can_write(struct d_can_priv *priv, u32 reg, u32 val) { __raw_writel(val, priv->base + reg); } static inline u32 d_can_read(struct d_can_priv *priv, int reg) { return __raw_readl(priv->base + reg); } static inline void d_can_set_bit(struct d_can_priv *priv, int reg, u32 bit_mask) { d_can_write(priv, reg, d_can_read(priv, reg) | bit_mask); } static inline u32 d_can_get_bit(struct d_can_priv *priv, int reg, u32 bit_mask) { return (d_can_read(priv, reg) & bit_mask) ? 1 : 0; } static inline void d_can_clear_bit(struct d_can_priv *priv, int reg, u32 bit_mask) { d_can_write(priv, reg, d_can_read(priv, reg) & ~bit_mask); } static inline int get_tx_next_msg_obj(const struct d_can_priv *priv) { return (priv->tx_next & D_CAN_NEXT_MSG_OBJ_MASK) + D_CAN_MSG_OBJ_TX_FIRST; } static inline int get_tx_echo_msg_obj(const struct d_can_priv *priv) { return (priv->tx_echo & D_CAN_NEXT_MSG_OBJ_MASK) + D_CAN_MSG_OBJ_TX_FIRST; } /* * API for enabling and disabling the multiple interrupts * of the DCAN module like error interrupt, status interrupt * error enable/disable for instance zero and one and etc. */ static void d_can_interrupts(struct d_can_priv *priv, int enable) { unsigned int cntrl_save = d_can_read(priv, D_CAN_CTL); if (enable) cntrl_save |= (D_CAN_CTL_IE1 | D_CAN_CTL_EIE | D_CAN_CTL_IE0); else cntrl_save &= ~(D_CAN_CTL_IE1 | D_CAN_CTL_SIE | D_CAN_CTL_EIE | D_CAN_CTL_IE0); d_can_write(priv, D_CAN_CTL, cntrl_save); } static inline int d_can_msg_obj_is_busy(struct d_can_priv *priv, int iface) { int count = MIN_TIMEOUT_VALUE; while (count && (d_can_read(priv, D_CAN_IFCMD(iface)) & D_CAN_IF_CMD_BUSY)) { count--; udelay(1); } if (!count) return 1; return 0; } static inline void d_can_object_get(struct net_device *dev, int iface, int objno, int mask) { struct d_can_priv *priv = netdev_priv(dev); d_can_write(priv, D_CAN_IFCMD(iface), IFX_CMD_BITS(mask) | IFX_CMD_MSG_NUMBER(objno)); /* * As per specs, after writing the message object number in the * IF command register the transfer b/w interface register and * message RAM must be complete in 12 CAN-CLK period. */ if (d_can_msg_obj_is_busy(priv, iface)) netdev_err(dev, "timed out in object get\n"); } static inline void d_can_object_put(struct net_device *dev, int iface, int objno, int mask) { struct d_can_priv *priv = netdev_priv(dev); d_can_write(priv, D_CAN_IFCMD(iface), D_CAN_IF_CMD_WR | IFX_CMD_BITS(mask) | IFX_CMD_MSG_NUMBER(objno)); /* * As per specs, after writing the message object number in the * IF command register the transfer b/w interface register and * message RAM must be complete in 12 CAN-CLK period. */ if (d_can_msg_obj_is_busy(priv, iface)) netdev_err(dev, "timed out in object put\n"); } static void d_can_write_msg_object(struct net_device *dev, int iface, struct can_frame *frame, int objno) { int i; unsigned int id; u32 dataA = 0; u32 dataB = 0; u32 flags = 0; struct d_can_priv *priv = netdev_priv(dev); if (!(frame->can_id & CAN_RTR_FLAG)) flags |= D_CAN_IF_ARB_DIR_XMIT; if (frame->can_id & CAN_EFF_FLAG) { id = frame->can_id & CAN_EFF_MASK; flags |= D_CAN_IF_ARB_MSGXTD; } else id = ((frame->can_id & CAN_SFF_MASK) << 18); flags |= D_CAN_IF_ARB_MSGVAL; d_can_write(priv, D_CAN_IFARB(iface), IFX_WRITE_IDR(id) | flags); for (i = 0; i < frame->can_dlc; i++) { if (frame->can_dlc <= 4) dataA |= (frame->data[i] << (8 * i)); else { if (i < 4) dataA |= (frame->data[i] << (8 * i)); else dataB |= (frame->data[i] << (8 * (i - 4))); } } /* DATA write to Message object registers DATAA and DATAB */ if (frame->can_dlc <= 4) d_can_write(priv, D_CAN_IFDATA(iface), dataA); else { d_can_write(priv, D_CAN_IFDATB(iface), dataB); d_can_write(priv, D_CAN_IFDATA(iface), dataA); } /* enable TX interrupt for this message object */ d_can_write(priv, D_CAN_IFMCTL(iface), D_CAN_IF_MCTL_TXIE | D_CAN_IF_MCTL_EOB | D_CAN_IF_MCTL_TXRQST | D_CAN_IF_MCTL_NEWDAT | frame->can_dlc); /* Put message data into message RAM */ d_can_object_put(dev, iface, objno, D_CAN_IF_CMD_ALL); } /* * Mark that this particular message object is received and clearing * the interrupt pending register value. */ static inline void d_can_mark_rx_msg_obj(struct net_device *dev, int iface, int ctrl_mask, int obj) { struct d_can_priv *priv = netdev_priv(dev); d_can_write(priv, D_CAN_IFMCTL(iface), ctrl_mask & ~(D_CAN_IF_MCTL_MSGLST | D_CAN_IF_MCTL_INTPND)); d_can_object_put(dev, iface, obj, D_CAN_IF_CMD_CONTROL); } static inline void d_can_activate_all_lower_rx_msg_objs(struct net_device *dev, int iface, int ctrl_mask) { int i; struct d_can_priv *priv = netdev_priv(dev); for (i = D_CAN_MSG_OBJ_RX_FIRST; i <= D_CAN_MSG_OBJ_RX_LOW_LAST; i++) { d_can_write(priv, D_CAN_IFMCTL(iface), ctrl_mask & ~(D_CAN_IF_MCTL_MSGLST | D_CAN_IF_MCTL_INTPND | D_CAN_IF_MCTL_NEWDAT)); d_can_object_put(dev, iface, i, D_CAN_IF_CMD_CONTROL); } } static inline void d_can_activate_rx_msg_obj(struct net_device *dev, int iface, int ctrl_mask, int obj) { struct d_can_priv *priv = netdev_priv(dev); d_can_write(priv, D_CAN_IFMCTL(iface), ctrl_mask & ~(D_CAN_IF_MCTL_MSGLST | D_CAN_IF_MCTL_INTPND | D_CAN_IF_MCTL_NEWDAT)); d_can_object_put(dev, iface, obj, D_CAN_IF_CMD_CONTROL); } static void d_can_handle_lost_msg_obj(struct net_device *dev, int iface, int objno) { struct d_can_priv *priv = netdev_priv(dev); struct net_device_stats *stats = &dev->stats; struct sk_buff *skb; struct can_frame *frame; netdev_err(dev, "msg lost in buffer %d\n", objno); d_can_object_get(dev, iface, objno, D_CAN_IF_CMD_ALL & ~D_CAN_IF_CMD_TXRQST); d_can_write(priv, D_CAN_IFMCTL(iface), D_CAN_IF_MCTL_CLR_MSGLST); d_can_object_put(dev, iface, objno, D_CAN_IF_CMD_CONTROL); /* create an error msg */ skb = alloc_can_err_skb(dev, &frame); if (unlikely(!skb)) return; frame->can_id |= CAN_ERR_CRTL; frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; stats->rx_errors++; stats->rx_over_errors++; netif_receive_skb(skb); } static int d_can_read_msg_object(struct net_device *dev, int iface, int ctrl) { int i; u32 dataA = 0; u32 dataB = 0; unsigned int arb_val; unsigned int mctl_val; struct d_can_priv *priv = netdev_priv(dev); struct net_device_stats *stats = &dev->stats; struct sk_buff *skb; struct can_frame *frame; skb = alloc_can_skb(dev, &frame); if (!skb) { stats->rx_dropped++; return -ENOMEM; } frame->can_dlc = get_can_dlc(ctrl & 0x0F); arb_val = d_can_read(priv, D_CAN_IFARB(iface)); mctl_val = d_can_read(priv, D_CAN_IFMCTL(iface)); if (arb_val & D_CAN_IF_ARB_MSGXTD) frame->can_id = (arb_val & CAN_EFF_MASK) | CAN_EFF_FLAG; else frame->can_id = (arb_val >> 18) & CAN_SFF_MASK; if (mctl_val & D_CAN_IF_MCTL_RMTEN) frame->can_id |= CAN_RTR_FLAG; else { dataA = d_can_read(priv, D_CAN_IFDATA(iface)); dataB = d_can_read(priv, D_CAN_IFDATB(iface)); for (i = 0; i < frame->can_dlc; i++) { /* Writing MO higher 4 data bytes to skb */ if (frame->can_dlc <= 4) frame->data[i] = dataA >> (8 * i); else { if (i < 4) frame->data[i] = dataA >> (8 * i); else frame->data[i] = dataB >> (8 * (i-4)); } } } netif_receive_skb(skb); stats->rx_packets++; stats->rx_bytes += frame->can_dlc; return 0; } static void d_can_setup_receive_object(struct net_device *dev, int iface, int objno, unsigned int mask, unsigned int id, unsigned int mcont) { struct d_can_priv *priv = netdev_priv(dev); d_can_write(priv, D_CAN_IFMSK(iface), IFX_WRITE_IDR(mask)); d_can_write(priv, D_CAN_IFARB(iface), IFX_WRITE_IDR(id) | D_CAN_IF_ARB_MSGVAL); d_can_write(priv, D_CAN_IFMCTL(iface), mcont); d_can_object_put(dev, iface, objno, D_CAN_IF_CMD_ALL & ~D_CAN_IF_CMD_TXRQST); netdev_dbg(dev, "obj no:%d, msgval:0x%08x\n", objno, d_can_read(priv, D_CAN_MSGVAL(D_CAN_GET_XREG_NUM(priv, D_CAN_MSGVAL_X)))); } static void d_can_inval_msg_object(struct net_device *dev, int iface, int objno) { struct d_can_priv *priv = netdev_priv(dev); d_can_write(priv, D_CAN_IFARB(iface), 0); d_can_write(priv, D_CAN_IFMCTL(iface), 0); d_can_object_put(dev, iface, objno, D_CAN_IF_CMD_ARB | D_CAN_IF_CMD_CONTROL); netdev_dbg(dev, "obj no:%d, msgval:0x%08x\n", objno, d_can_read(priv, D_CAN_MSGVAL(D_CAN_GET_XREG_NUM(priv, D_CAN_MSGVAL_X)))); } static inline int d_can_is_next_tx_obj_busy(struct d_can_priv *priv, int objno) { u32 txrq_x_reg_val = D_CAN_GET_XREG_NUM(priv, D_CAN_TXRQ_X); /* * as transmission request register's bit n-1 corresponds to * message object n, we need to handle the same properly. */ if (d_can_read(priv, D_CAN_TXRQ(txrq_x_reg_val)) & (1 << (objno - D_CAN_MSG_OBJ_TX_FIRST))) return 1; return 0; } static netdev_tx_t d_can_start_xmit(struct sk_buff *skb, struct net_device *dev) { u32 msg_obj_no; struct d_can_priv *priv = netdev_priv(dev); struct can_frame *frame = (struct can_frame *)skb->data; if (can_dropped_invalid_skb(dev, skb)) return NETDEV_TX_OK; msg_obj_no = get_tx_next_msg_obj(priv); /* prepare message object for transmission */ d_can_write_msg_object(dev, D_CAN_IF_TX_NUM, frame, msg_obj_no); can_put_echo_skb(skb, dev, msg_obj_no - D_CAN_MSG_OBJ_TX_FIRST); /* * we have to stop the queue in case of a wrap around or * if the next TX message object is still in use */ priv->tx_next++; if (d_can_is_next_tx_obj_busy(priv, get_tx_next_msg_obj(priv)) || ((priv->tx_next & D_CAN_NEXT_MSG_OBJ_MASK) == 0)) netif_stop_queue(dev); return NETDEV_TX_OK; } static int d_can_set_bittiming(struct net_device *dev) { struct d_can_priv *priv = netdev_priv(dev); const struct can_bittiming *bt = &priv->can.bittiming; u32 can_btc; can_btc = ((bt->phase_seg2 - 1) & 0x7) << D_CAN_BTR_TSEG2_SHIFT; can_btc |= ((bt->phase_seg1 + bt->prop_seg - 1) & 0xF) << D_CAN_BTR_TSEG1_SHIFT; can_btc |= ((bt->sjw - 1) & 0x3) << D_CAN_BTR_SJW_SHIFT; /* Ten bits contains the BRP, 6 bits for BRP and upper 4 bits for brpe*/ can_btc |= ((bt->brp - 1) & 0x3F) << D_CAN_BTR_BRP_SHIFT; can_btc |= ((((bt->brp - 1) >> 6) & 0xF) << D_CAN_BTR_BRPE_SHIFT); d_can_write(priv, D_CAN_BTR, can_btc); netdev_info(dev, "setting CAN BT = %#x\n", can_btc); return 0; } /* * Configure D_CAN message objects for Tx and Rx purposes: * D_CAN provides a total of 64 message objects that can be configured * either for Tx or Rx purposes. In this driver first 32 message objects * are used as a reception FIFO and the reception FIFO is signified by the * EoB bit being SET. The remaining 32 message objects are kept aside for * Tx purposes. See user guide document for further details on configuring * message objects. */ static void d_can_configure_msg_objects(struct net_device *dev) { unsigned int i; /* first invalidate all message objects */ for (i = D_CAN_MSG_OBJ_RX_FIRST; i <= D_CAN_NUM_MSG_OBJECTS; i++) d_can_inval_msg_object(dev, D_CAN_IF_RX_NUM, i); /* setup receive message objects */ for (i = D_CAN_MSG_OBJ_RX_FIRST; i < D_CAN_MSG_OBJ_RX_LAST; i++) d_can_setup_receive_object(dev, D_CAN_IF_RX_NUM, i, 0, 0, (D_CAN_IF_MCTL_RXIE | D_CAN_IF_MCTL_UMASK) & ~D_CAN_IF_MCTL_EOB); /* Last object EoB bit should be 1 for terminate */ d_can_setup_receive_object(dev, D_CAN_IF_RX_NUM, D_CAN_MSG_OBJ_RX_LAST, 0, 0, D_CAN_IF_MCTL_RXIE | D_CAN_IF_MCTL_UMASK | D_CAN_IF_MCTL_EOB); } static void d_can_test_mode(struct net_device *dev) { struct d_can_priv *priv = netdev_priv(dev); /* Test mode is enabled in this step & the specific TEST bits * are enabled accordingly */ d_can_write(priv, D_CAN_CTL, D_CAN_CTL_EIE | D_CAN_CTL_IE1 | D_CAN_CTL_IE0 | D_CAN_CTL_TEST); if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) { /* silent mode : bus-monitoring mode */ d_can_write(priv, D_CAN_TEST, D_CAN_TEST_SILENT); } else if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) { /* loopback mode : useful for self-test function */ d_can_write(priv, D_CAN_TEST, D_CAN_TEST_LBACK); } else { /* loopback + silent mode : useful for hot self-test */ d_can_write(priv, D_CAN_TEST, D_CAN_TEST_LBACK | D_CAN_TEST_SILENT); } } /* * Configure D_CAN chip: * - enable/disable auto-retransmission * - set operating mode * - configure message objects */ static void d_can_init(struct net_device *dev) { struct d_can_priv *priv = netdev_priv(dev); u32 cnt; netdev_dbg(dev, "resetting d_can ...\n"); d_can_set_bit(priv, D_CAN_CTL, D_CAN_CTL_SWR); /* Enter initialization mode by setting the Init bit */ d_can_set_bit(priv, D_CAN_CTL, D_CAN_CTL_INIT); /* enable automatic retransmission */ d_can_set_bit(priv, D_CAN_CTL, D_CAN_CTL_ENABLE_AR); /* Set the Configure Change Enable ( CCE) bit */ d_can_set_bit(priv, D_CAN_CTL, D_CAN_CTL_CCE); /* Wait for the Init bit to get set */ cnt = D_CAN_WAIT_COUNT; while (!d_can_get_bit(priv, D_CAN_CTL, D_CAN_CTL_INIT) && cnt != 0) { --cnt; udelay(10); } /* set bittiming params */ d_can_set_bittiming(dev); d_can_clear_bit(priv, D_CAN_CTL, D_CAN_CTL_INIT | D_CAN_CTL_CCE); /* Wait for the Init bit to get clear */ cnt = D_CAN_WAIT_COUNT; while (d_can_get_bit(priv, D_CAN_CTL, D_CAN_CTL_INIT) && cnt != 0) { --cnt; udelay(10); } if (!priv->test_mode) { /* normal mode*/ d_can_write(priv, D_CAN_CTL, D_CAN_CTL_EIE | D_CAN_CTL_IE1 | D_CAN_CTL_IE0); } else d_can_test_mode(dev); /* Enable TX and RX I/O Control pins */ d_can_write(priv, D_CAN_TIOC, D_CAN_TIOC_FUNC); d_can_write(priv, D_CAN_RIOC, D_CAN_RIOC_FUNC); /* configure message objects */ d_can_configure_msg_objects(dev); /* set a LEC value so that we can check for updates later */ d_can_write(priv, D_CAN_ES, LEC_UNUSED); } static void d_can_start(struct net_device *dev) { struct d_can_priv *priv = netdev_priv(dev); /* basic d_can initialization */ d_can_init(dev); priv->can.state = CAN_STATE_ERROR_ACTIVE; /* reset tx helper pointers */ priv->tx_next = priv->tx_echo = 0; /* enable status change, error and module interrupts */ d_can_interrupts(priv, ENABLE_ALL_INTERRUPTS); } static void d_can_stop(struct net_device *dev) { struct d_can_priv *priv = netdev_priv(dev); /* disable all interrupts */ d_can_interrupts(priv, DISABLE_ALL_INTERRUPTS); /* set the state as STOPPED */ priv->can.state = CAN_STATE_STOPPED; } static int d_can_set_mode(struct net_device *dev, enum can_mode mode) { switch (mode) { case CAN_MODE_START: d_can_start(dev); netif_wake_queue(dev); break; default: return -EOPNOTSUPP; } return 0; } static int d_can_get_berr_counter(const struct net_device *dev, struct can_berr_counter *bec) { unsigned int reg_err_counter; struct d_can_priv *priv = netdev_priv(dev); reg_err_counter = d_can_read(priv, D_CAN_ERRC); bec->rxerr = (reg_err_counter & D_CAN_ERRC_REC_MASK) >> D_CAN_ERRC_REC_SHIFT; bec->txerr = reg_err_counter & D_CAN_ERRC_TEC_MASK; return 0; } /* * theory of operation: * * priv->tx_echo holds the number of the oldest can_frame put for * transmission into the hardware, but not yet ACKed by the CAN tx * complete IRQ. * * We iterate from priv->tx_echo to priv->tx_next and check if the * packet has been transmitted, echo it back to the CAN framework. * If we discover a not yet transmitted package, stop looking for more. */ static void d_can_do_tx(struct net_device *dev) { u32 msg_obj_no; struct d_can_priv *priv = netdev_priv(dev); struct net_device_stats *stats = &dev->stats; u32 txrq_x_reg_val; u32 txrq_reg_val; for (/* nix */; (priv->tx_next - priv->tx_echo) > 0; priv->tx_echo++) { msg_obj_no = get_tx_echo_msg_obj(priv); txrq_x_reg_val = D_CAN_GET_XREG_NUM(priv, D_CAN_TXRQ_X); txrq_reg_val = d_can_read(priv, D_CAN_TXRQ(txrq_x_reg_val)); if (!(txrq_reg_val & (1 << (msg_obj_no - D_CAN_MSG_OBJ_TX_FIRST)))) { can_get_echo_skb(dev, msg_obj_no - D_CAN_MSG_OBJ_TX_FIRST); stats->tx_bytes += d_can_read(priv, D_CAN_IFMCTL(D_CAN_IF_TX_NUM)) & D_CAN_IF_MCTL_DLC_MASK; stats->tx_packets++; d_can_inval_msg_object(dev, D_CAN_IF_TX_NUM, msg_obj_no); } else break; } /* restart queue if wrap-up or if queue stalled on last pkt */ if (((priv->tx_next & D_CAN_NEXT_MSG_OBJ_MASK) != 0) || ((priv->tx_echo & D_CAN_NEXT_MSG_OBJ_MASK) == 0)) netif_wake_queue(dev); } /* * theory of operation: * * d_can core saves a received CAN message into the first free message * object it finds free (starting with the lowest). Bits NEWDAT and * INTPND are set for this message object indicating that a new message * has arrived. To work-around this issue, we keep two groups of message * objects whose partitioning is defined by D_CAN_MSG_OBJ_RX_SPLIT. * * To ensure in-order frame reception we use the following * approach while re-activating a message object to receive further * frames: * - if the current message object number is lower than * D_CAN_MSG_RX_LOW_LAST, do not clear the NEWDAT bit while clearing * the INTPND bit. * - if the current message object number is equal to * D_CAN_MSG_RX_LOW_LAST then clear the NEWDAT bit of all lower * receive message objects. * - if the current message object number is greater than * D_CAN_MSG_RX_LOW_LAST then clear the NEWDAT bit of * only this message object. */ static int d_can_do_rx_poll(struct net_device *dev, int quota) { struct d_can_priv *priv = netdev_priv(dev); unsigned int msg_obj, mctrl_reg_val; u32 num_rx_pkts = 0; u32 intpnd_x_reg_val; u32 intpnd_reg_val; for (msg_obj = D_CAN_MSG_OBJ_RX_FIRST; msg_obj <= D_CAN_MSG_OBJ_RX_LAST && quota > 0; msg_obj++) { intpnd_x_reg_val = D_CAN_GET_XREG_NUM(priv, D_CAN_INTPND_X); intpnd_reg_val = d_can_read(priv, D_CAN_INTPND(intpnd_x_reg_val)); /* * as interrupt pending register's bit n-1 corresponds to * message object n, we need to handle the same properly. */ if (intpnd_reg_val & (1 << (msg_obj - 1))) { d_can_object_get(dev, D_CAN_IF_RX_NUM, msg_obj, D_CAN_IF_CMD_ALL & ~D_CAN_IF_CMD_TXRQST); mctrl_reg_val = d_can_read(priv, D_CAN_IFMCTL(D_CAN_IF_RX_NUM)); if (!(mctrl_reg_val & D_CAN_IF_MCTL_NEWDAT)) continue; /* read the data from the message object */ d_can_read_msg_object(dev, D_CAN_IF_RX_NUM, mctrl_reg_val); if (mctrl_reg_val & D_CAN_IF_MCTL_EOB) d_can_setup_receive_object(dev, D_CAN_IF_RX_NUM, D_CAN_MSG_OBJ_RX_LAST, 0, 0, D_CAN_IF_MCTL_RXIE | D_CAN_IF_MCTL_UMASK | D_CAN_IF_MCTL_EOB); if (mctrl_reg_val & D_CAN_IF_MCTL_MSGLST) { d_can_handle_lost_msg_obj(dev, D_CAN_IF_RX_NUM, msg_obj); num_rx_pkts++; quota--; continue; } if (msg_obj < D_CAN_MSG_OBJ_RX_LOW_LAST) d_can_mark_rx_msg_obj(dev, D_CAN_IF_RX_NUM, mctrl_reg_val, msg_obj); else if (msg_obj > D_CAN_MSG_OBJ_RX_LOW_LAST) /* activate this msg obj */ d_can_activate_rx_msg_obj(dev, D_CAN_IF_RX_NUM, mctrl_reg_val, msg_obj); else if (msg_obj == D_CAN_MSG_OBJ_RX_LOW_LAST) /* activate all lower message objects */ d_can_activate_all_lower_rx_msg_objs(dev, D_CAN_IF_RX_NUM, mctrl_reg_val); num_rx_pkts++; quota--; } } return num_rx_pkts; } static inline int d_can_has_handle_berr(struct d_can_priv *priv) { return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) && (priv->current_status & LEC_UNUSED); } static int d_can_handle_state_change(struct net_device *dev, enum d_can_bus_error_types error_type) { unsigned int reg_err_counter; unsigned int rx_err_passive; struct d_can_priv *priv = netdev_priv(dev); struct net_device_stats *stats = &dev->stats; struct can_frame *cf; struct sk_buff *skb; struct can_berr_counter bec; /* propagate the error condition to the CAN stack */ skb = alloc_can_err_skb(dev, &cf); if (unlikely(!skb)) return 0; d_can_get_berr_counter(dev, &bec); reg_err_counter = d_can_read(priv, D_CAN_ERRC); rx_err_passive = (reg_err_counter & D_CAN_ERRC_RP_MASK) >> D_CAN_ERRC_RP_SHIFT; switch (error_type) { case D_CAN_ERROR_WARNING: /* error warning state */ priv->can.can_stats.error_warning++; priv->can.state = CAN_STATE_ERROR_WARNING; cf->can_id |= CAN_ERR_CRTL; cf->data[1] = (bec.txerr > bec.rxerr) ? CAN_ERR_CRTL_TX_WARNING : CAN_ERR_CRTL_RX_WARNING; cf->data[6] = bec.txerr; cf->data[7] = bec.rxerr; break; case D_CAN_ERROR_PASSIVE: /* error passive state */ priv->can.can_stats.error_passive++; priv->can.state = CAN_STATE_ERROR_PASSIVE; cf->can_id |= CAN_ERR_CRTL; if (rx_err_passive) cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE; if (bec.txerr > 127) cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE; cf->data[6] = bec.txerr; cf->data[7] = bec.rxerr; break; case D_CAN_BUS_OFF: /* bus-off state */ priv->can.state = CAN_STATE_BUS_OFF; cf->can_id |= CAN_ERR_BUSOFF; /* * disable all interrupts in bus-off mode to ensure that * the CPU is not hogged down */ d_can_interrupts(priv, DISABLE_ALL_INTERRUPTS); can_bus_off(dev); break; default: break; } netif_receive_skb(skb); stats->rx_packets++; stats->rx_bytes += cf->can_dlc; return 1; } static int d_can_handle_bus_err(struct net_device *dev, enum d_can_lec_type lec_type) { struct d_can_priv *priv = netdev_priv(dev); struct net_device_stats *stats = &dev->stats; struct can_frame *cf; struct sk_buff *skb; /* * early exit if no lec update or no error. * no lec update means that no CAN bus event has been detected * since CPU wrote 0x7 value to status reg. */ if (lec_type == LEC_UNUSED || lec_type == LEC_NO_ERROR) return 0; /* propagate the error condition to the CAN stack */ skb = alloc_can_err_skb(dev, &cf); if (unlikely(!skb)) return 0; /* * check for 'last error code' which tells us the * type of the last error to occur on the CAN bus */ /* common for all type of bus errors */ priv->can.can_stats.bus_error++; stats->rx_errors++; cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; cf->data[2] |= CAN_ERR_PROT_UNSPEC; switch (lec_type) { case LEC_STUFF_ERROR: netdev_dbg(dev, "stuff error\n"); cf->data[2] |= CAN_ERR_PROT_STUFF; break; case LEC_FORM_ERROR: netdev_dbg(dev, "form error\n"); cf->data[2] |= CAN_ERR_PROT_FORM; break; case LEC_ACK_ERROR: netdev_dbg(dev, "ack error\n"); cf->data[2] |= (CAN_ERR_PROT_LOC_ACK | CAN_ERR_PROT_LOC_ACK_DEL); break; case LEC_BIT1_ERROR: netdev_dbg(dev, "bit1 error\n"); cf->data[2] |= CAN_ERR_PROT_BIT1; break; case LEC_BIT0_ERROR: netdev_dbg(dev, "bit0 error\n"); cf->data[2] |= CAN_ERR_PROT_BIT0; break; case LEC_CRC_ERROR: netdev_dbg(dev, "CRC error\n"); cf->data[2] |= (CAN_ERR_PROT_LOC_CRC_SEQ | CAN_ERR_PROT_LOC_CRC_DEL); break; default: break; } /* set a LEC value so that we can check for updates later */ d_can_write(priv, D_CAN_ES, LEC_UNUSED); netif_receive_skb(skb); stats->rx_packets++; stats->rx_bytes += cf->can_dlc; return 1; } static int d_can_poll(struct napi_struct *napi, int quota) { int lec_type = 0; int work_done = 0; struct net_device *dev = napi->dev; struct d_can_priv *priv = netdev_priv(dev); if (!priv->irqstatus) goto end; /* status events have the highest priority */ if (priv->irqstatus == STATUS_INTERRUPT) { priv->current_status = d_can_read(priv, D_CAN_ES); /* handle Tx/Rx events */ if (priv->current_status & D_CAN_ES_TXOK) d_can_write(priv, D_CAN_ES, priv->current_status & ~D_CAN_ES_TXOK); if (priv->current_status & D_CAN_ES_RXOK) d_can_write(priv, D_CAN_ES, priv->current_status & ~D_CAN_ES_RXOK); /* handle state changes */ if ((priv->current_status & D_CAN_ES_EWARN) && (!(priv->last_status & D_CAN_ES_EWARN))) { netdev_dbg(dev, "entered error warning state\n"); work_done += d_can_handle_state_change(dev, D_CAN_ERROR_WARNING); } if ((priv->current_status & D_CAN_ES_EPASS) && (!(priv->last_status & D_CAN_ES_EPASS))) { netdev_dbg(dev, "entered error passive state\n"); work_done += d_can_handle_state_change(dev, D_CAN_ERROR_PASSIVE); } if ((priv->current_status & D_CAN_ES_BOFF) && (!(priv->last_status & D_CAN_ES_BOFF))) { netdev_dbg(dev, "entered bus off state\n"); work_done += d_can_handle_state_change(dev, D_CAN_BUS_OFF); } /* handle bus recovery events */ if ((!(priv->current_status & D_CAN_ES_BOFF)) && (priv->last_status & D_CAN_ES_BOFF)) { netdev_dbg(dev, "left bus off state\n"); priv->can.state = CAN_STATE_ERROR_ACTIVE; } if ((!(priv->current_status & D_CAN_ES_EPASS)) && (priv->last_status & D_CAN_ES_EPASS)) { netdev_dbg(dev, "left error passive state\n"); priv->can.state = CAN_STATE_ERROR_ACTIVE; } priv->last_status = priv->current_status; /* handle lec errors on the bus */ lec_type = d_can_has_handle_berr(priv); if (lec_type) work_done += d_can_handle_bus_err(dev, lec_type); } else if ((priv->irqstatus >= D_CAN_MSG_OBJ_RX_FIRST) && (priv->irqstatus <= D_CAN_MSG_OBJ_RX_LAST)) { /* handle events corresponding to receive message objects */ work_done += d_can_do_rx_poll(dev, (quota - work_done)); } else if ((priv->irqstatus >= D_CAN_MSG_OBJ_TX_FIRST) && (priv->irqstatus <= D_CAN_MSG_OBJ_TX_LAST)) { /* handle events corresponding to transmit message objects */ d_can_do_tx(dev); } end: if (work_done < quota) { napi_complete(napi); /* enable all IRQs */ d_can_interrupts(priv, ENABLE_ALL_INTERRUPTS); } return work_done; } static irqreturn_t d_can_isr(int irq, void *dev_id) { struct net_device *dev = (struct net_device *)dev_id; struct d_can_priv *priv = netdev_priv(dev); priv->irqstatus = d_can_read(priv, D_CAN_INT); if (!priv->irqstatus) return IRQ_NONE; /* disable all interrupts and schedule the NAPI */ d_can_interrupts(priv, DISABLE_ALL_INTERRUPTS); napi_schedule(&priv->napi); return IRQ_HANDLED; } static int d_can_open(struct net_device *ndev) { int err; struct d_can_priv *priv = netdev_priv(ndev); /* Open common can device */ err = open_candev(ndev); if (err) { netdev_err(ndev, "open_candev() failed %d\n", err); return err; } /* register interrupt handler for Message Object (MO) * and Error + status change (ES) */ err = request_irq(ndev->irq, &d_can_isr, IRQF_SHARED, ndev->name, ndev); if (err) { netdev_err(ndev, "failed to request MO_ES interrupt\n"); goto exit_close_candev; } /* register interrupt handler for only Message Object */ err = request_irq(priv->irq_obj, &d_can_isr, IRQF_SHARED, ndev->name, ndev); if (err) { netdev_err(ndev, "failed to request MO interrupt\n"); goto exit_free_irq; } /* start the d_can controller */ d_can_start(ndev); napi_enable(&priv->napi); netif_start_queue(ndev); return 0; exit_free_irq: free_irq(ndev->irq, ndev); exit_close_candev: close_candev(ndev); return err; } static int d_can_close(struct net_device *ndev) { struct d_can_priv *priv = netdev_priv(ndev); netif_stop_queue(ndev); napi_disable(&priv->napi); d_can_stop(ndev); free_irq(ndev->irq, ndev); free_irq(priv->irq_obj, ndev); close_candev(ndev); return 0; } struct net_device *alloc_d_can_dev(int num_objs) { struct net_device *dev; struct d_can_priv *priv; dev = alloc_candev(sizeof(struct d_can_priv), num_objs/2); if (!dev) return NULL; priv = netdev_priv(dev); netif_napi_add(dev, &priv->napi, d_can_poll, num_objs/2); priv->dev = dev; priv->can.bittiming_const = &d_can_bittiming_const; priv->can.do_set_mode = d_can_set_mode; priv->can.do_get_berr_counter = d_can_get_berr_counter; priv->can.ctrlmode_supported = (CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY | CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_3_SAMPLES); return dev; } EXPORT_SYMBOL_GPL(alloc_d_can_dev); void free_d_can_dev(struct net_device *dev) { free_candev(dev); } EXPORT_SYMBOL_GPL(free_d_can_dev); static const struct net_device_ops d_can_netdev_ops = { .ndo_open = d_can_open, .ndo_stop = d_can_close, .ndo_start_xmit = d_can_start_xmit, }; int register_d_can_dev(struct net_device *dev) { /* we support local echo */ dev->flags |= IFF_ECHO; dev->netdev_ops = &d_can_netdev_ops; return register_candev(dev); } EXPORT_SYMBOL_GPL(register_d_can_dev); void unregister_d_can_dev(struct net_device *dev) { struct d_can_priv *priv = netdev_priv(dev); /* disable all interrupts */ d_can_interrupts(priv, DISABLE_ALL_INTERRUPTS); unregister_candev(dev); } EXPORT_SYMBOL_GPL(unregister_d_can_dev); MODULE_AUTHOR("Anil Kumar Ch <anilkumar(a)ti.com>"); MODULE_LICENSE("GPL v2"); MODULE_VERSION(D_CAN_VERSION); MODULE_DESCRIPTION(D_CAN_DRV_DESC);/ l4/pkg/d_can/d_can/d_can.h: //* * CAN bus driver for Bosch D_CAN controller * * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ * Anil Kumar Ch <anilkumar(a)ti.com> * * Borrowed from C_CAN driver * Copyright (C) 2010 ST Microelectronics * - Bhupesh Sharma <bhupesh.sharma(a)st.com> * * Borrowed heavily from the C_CAN driver originally written by: * Copyright (C) 2007 * - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer(a)pengutronix.de> * - Simon Kallweit, intefo AG <simon.kallweit(a)intefo.ch> * * Bosch D_CAN controller is compliant to CAN protocol version 2.0 part A and B. * Bosch D_CAN user manual can be obtained from: * http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/can/ * d_can_users_manual_111.pdf * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #ifndef D_CAN_H #define D_CAN_H #define D_CAN_DRV_NAME "d_can" #define D_CAN_VERSION "1.0" #define D_CAN_DRV_DESC "CAN bus driver for Bosch D_CAN controller " \ D_CAN_VERSION /* d_can private data structure */ struct d_can_priv { struct can_priv can; /* must be the first member */ struct napi_struct napi; struct net_device *dev; int current_status; int last_status; unsigned int irqstatus; void __iomem *base; u32 napi_weight; struct clk *fck; struct clk *ick; bool test_mode; unsigned int irq; /* device IRQ number, for all MO and ES */ unsigned int irq_obj; /* device IRQ number for only Msg Object */ unsigned int irq_parity; /* device IRQ number for parity error */ unsigned long irq_flags; /* for request_irq() */ unsigned int tx_next; unsigned int tx_echo; unsigned int rx_next; void *priv; /* for board-specific data */ }; struct net_device *alloc_d_can_dev(int); void free_d_can_dev(struct net_device *dev); int register_d_can_dev(struct net_device *dev); void unregister_d_can_dev(struct net_device *dev); #endif /* D_CAN_H *// l4/pkg/d_can/d_can/d_can_platform.c: / /* * Platform CAN bus driver for Bosch D_CAN controller * * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ * Anil Kumar Ch <anilkumar(a)ti.com> * * Borrowed from C_CAN driver * Copyright (C) 2010 ST Microelectronics * - Bhupesh Sharma <bhupesh.sharma(a)st.com> * * Borrowed heavily from the C_CAN driver originally written by: * Copyright (C) 2007 * - Sascha Hauer, Marc Kleine-Budde, Pengutronix <s.hauer(a)pengutronix.de> * - Simon Kallweit, intefo AG <simon.kallweit(a)intefo.ch> * * Bosch D_CAN controller is compliant to CAN protocol version 2.0 part A and B. * Bosch D_CAN user manual can be obtained from: * http://www.semiconductors.bosch.de/media/en/pdf/ipmodules_1/can/ * d_can_users_manual_111.pdf * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ /* * Your platform definitions should specify module ram offsets and interrupt * number to use as follows: * * static struct d_can_platform_data am33xx_evm_d_can_pdata = { * .d_can_offset = 0, * .d_can_ram_offset = 0x1000, * .num_of_msg_objs = 64, * .dma_support = true, * .test_mode_enable = false, * .parity_check = false, * .version = 0x1, * .hw_raminit = d_can_hw_raminit, * }; * * Please see include/linux/can/platform/d_can.h for description of * above fields. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/netdevice.h> #include <linux/if_arp.h> #include <linux/if_ether.h> #include <linux/list.h> #include <linux/io.h> #include <linux/platform_device.h> #include <linux/can/platform/d_can.h> #include <linux/clk.h> #include <linux/slab.h> #include <linux/can/dev.h> #include "d_can.h" static int __devinit d_can_plat_probe(struct platform_device *pdev) { int ret = 0; void __iomem *addr; struct net_device *ndev; struct d_can_priv *priv; struct resource *mem; struct d_can_platform_data *pdata; pdata = pdev->dev.platform_data; if (!pdata) { dev_err(&pdev->dev, "No platform data\n"); goto exit; } /* allocate the d_can device */ ndev = alloc_d_can_dev(pdata->num_of_msg_objs); if (!ndev) { ret = -ENOMEM; dev_err(&pdev->dev, "alloc_d_can_dev failed\n"); goto exit; } priv = netdev_priv(ndev); priv->fck = clk_get(&pdev->dev, pdata->fck_name); if (IS_ERR(priv->fck)) { dev_err(&pdev->dev, "%s is not found\n", pdata->fck_name); ret = -ENODEV; goto exit_free_ndev; } clk_enable(priv->fck); priv->ick = clk_get(&pdev->dev, pdata->ick_name); if (IS_ERR(priv->ick)) { dev_err(&pdev->dev, "%s is not found\n", pdata->ick_name); ret = -ENODEV; goto exit_free_fck; } clk_enable(priv->ick); /* get the platform data */ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!mem) { ret = -ENODEV; dev_err(&pdev->dev, "No mem resource\n"); goto exit_free_clks; } if (!request_mem_region(mem->start, resource_size(mem), D_CAN_DRV_NAME)) { dev_err(&pdev->dev, "resource unavailable\n"); ret = -EBUSY; goto exit_free_clks; } addr = ioremap(mem->start, resource_size(mem)); if (!addr) { dev_err(&pdev->dev, "ioremap failed\n"); ret = -ENOMEM; goto exit_release_mem; } /* IRQ specific to Error and status & can be used for Message Object */ ndev->irq = platform_get_irq_byname(pdev, "int0"); if (!ndev->irq) { dev_err(&pdev->dev, "No irq0 resource\n"); goto exit_iounmap; } /* IRQ specific for Message Object */ priv->irq_obj = platform_get_irq_byname(pdev, "int1"); if (!priv->irq_obj) { dev_err(&pdev->dev, "No irq1 resource\n"); goto exit_iounmap; } priv->base = addr; priv->can.clock.freq = clk_get_rate(priv->fck); priv->test_mode = pdata->test_mode_enable; platform_set_drvdata(pdev, ndev); SET_NETDEV_DEV(ndev, &pdev->dev); ret = register_d_can_dev(ndev); if (ret) { dev_err(&pdev->dev, "registering %s failed (err=%d)\n", D_CAN_DRV_NAME, ret); goto exit_free_device; } dev_info(&pdev->dev, "%s device registered (irq=%d, irq_obj=%d)\n", D_CAN_DRV_NAME, ndev->irq, priv->irq_obj); return 0; exit_free_device: platform_set_drvdata(pdev, NULL); exit_iounmap: iounmap(addr); exit_release_mem: release_mem_region(mem->start, resource_size(mem)); exit_free_clks: clk_disable(priv->ick); clk_put(priv->ick); exit_free_fck: clk_disable(priv->fck); clk_put(priv->fck); exit_free_ndev: free_d_can_dev(ndev); exit: dev_err(&pdev->dev, "probe failed\n"); return ret; } static int __devexit d_can_plat_remove(struct platform_device *pdev) { struct net_device *ndev = platform_get_drvdata(pdev); struct d_can_priv *priv = netdev_priv(ndev); struct resource *mem; unregister_d_can_dev(ndev); platform_set_drvdata(pdev, NULL); free_d_can_dev(ndev); iounmap(priv->base); mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(mem->start, resource_size(mem)); clk_disable(priv->ick); clk_disable(priv->fck); clk_put(priv->ick); clk_put(priv->fck); return 0; } static struct platform_driver d_can_plat_driver = { .driver = { .name = D_CAN_DRV_NAME, .owner = THIS_MODULE, }, .probe = d_can_plat_probe, .remove = __devexit_p(d_can_plat_remove), }; static int __init d_can_plat_init(void) { printk(KERN_INFO D_CAN_DRV_DESC "\n"); return platform_driver_register(&d_can_plat_driver); } module_init(d_can_plat_init); static void __exit d_can_plat_exit(void) { printk(KERN_INFO D_CAN_DRV_DESC " unloaded\n"); platform_driver_unregister(&d_can_plat_driver); } module_exit(d_can_plat_exit); MODULE_AUTHOR("Anil Kumar Ch <anilkumar(a)ti.com>"); MODULE_LICENSE("GPL v2"); MODULE_VERSION(D_CAN_VERSION); MODULE_DESCRIPTION(D_CAN_DRV_DESC);/ l4/pkg/d_can/d_can/Makefile: /PKGDIR ?= .. L4DIR ?= $(PKGDIR)/../.. DDE_SYSTEMS = x86 arm TARGET = d_can SRC_C = d_can.c d_can_platform.c REQUIRES_LIBS = slab ddekit dde-linux26 dde-linux26_net libio l4util l4re_c-util ifeq ($(ARCH), arm) DEFINES += -D__LINUX_ARM_ARCH__=6 ARCH_DIR = arch/arm endif include $(PKGDIR)/../dde/linux26/Makeconf #include $(PKGDIR_OBJ)/Makeconf include $(L4DIR)/mk/prog.mk # # Makefile for the Bosch D_CAN controller drivers. # obj-$(CONFIG_CAN_D_CAN) += d_can.o obj-$(CONFIG_CAN_D_CAN_PLATFORM) += d_can_platform.o ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG / l4/pkg/D-can/d_can/Kconfig: /menuconfig CAN_D_CAN tristate "Bosch D_CAN devices" depends on CAN_DEV && HAS_IOMEM if CAN_D_CAN config CAN_D_CAN_PLATFORM tristate "Generic Platform Bus based D_CAN driver" ---help--- This driver adds support for the D_CAN chips connected to the "platform bus" (Linux abstraction for directly to the processor attached devices) which can be found on am335x and dm814x boards from TI (http://www.ti.com) endif/

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