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Paul E. McKenney
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Ingo Molnar
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| refs/heads/master: f41bf2ab998daaa2ac27348d5813e0ae21c57ded | ||
| refs/heads/master: a682604838763981613e42015cd0e39f2989d6bb |
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| Original file line number | Diff line number | Diff line change |
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| This README escorted the skystar2-driver rewriting procedure. It describes the | ||
| state of the new flexcop-driver set and some internals are written down here | ||
| too. | ||
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| This document hopefully describes things about the flexcop and its | ||
| device-offsprings. Goal was to write an easy-to-write and easy-to-read set of | ||
| drivers based on the skystar2.c and other information. | ||
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| Remark: flexcop-pci.c was a copy of skystar2.c, but every line has been | ||
| touched and rewritten. | ||
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| History & News | ||
| ============== | ||
| 2005-04-01 - correct USB ISOC transfers (thanks to Vadim Catana) | ||
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| General coding processing | ||
| ========================= | ||
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| We should proceed as follows (as long as no one complains): | ||
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| 0) Think before start writing code! | ||
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| 1) rewriting the skystar2.c with the help of the flexcop register descriptions | ||
| and splitting up the files to a pci-bus-part and a flexcop-part. | ||
| The new driver will be called b2c2-flexcop-pci.ko/b2c2-flexcop-usb.ko for the | ||
| device-specific part and b2c2-flexcop.ko for the common flexcop-functions. | ||
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| 2) Search for errors in the leftover of flexcop-pci.c (compare with pluto2.c | ||
| and other pci drivers) | ||
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| 3) make some beautification (see 'Improvements when rewriting (refactoring) is | ||
| done') | ||
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| 4) Testing the new driver and maybe substitute the skystar2.c with it, to reach | ||
| a wider tester audience. | ||
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| 5) creating an usb-bus-part using the already written flexcop code for the pci | ||
| card. | ||
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| Idea: create a kernel-object for the flexcop and export all important | ||
| functions. This option saves kernel-memory, but maybe a lot of functions have | ||
| to be exported to kernel namespace. | ||
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| Current situation | ||
| ================= | ||
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| 0) Done :) | ||
| 1) Done (some minor issues left) | ||
| 2) Done | ||
| 3) Not ready yet, more information is necessary | ||
| 4) next to be done (see the table below) | ||
| 5) USB driver is working (yes, there are some minor issues) | ||
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| What seems to be ready? | ||
| ----------------------- | ||
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| 1) Rewriting | ||
| 1a) i2c is cut off from the flexcop-pci.c and seems to work | ||
| 1b) moved tuner and demod stuff from flexcop-pci.c to flexcop-tuner-fe.c | ||
| 1c) moved lnb and diseqc stuff from flexcop-pci.c to flexcop-tuner-fe.c | ||
| 1e) eeprom (reading MAC address) | ||
| 1d) sram (no dynamic sll size detection (commented out) (using default as JJ told me)) | ||
| 1f) misc. register accesses for reading parameters (e.g. resetting, revision) | ||
| 1g) pid/mac filter (flexcop-hw-filter.c) | ||
| 1i) dvb-stuff initialization in flexcop.c (done) | ||
| 1h) dma stuff (now just using the size-irq, instead of all-together, to be done) | ||
| 1j) remove flexcop initialization from flexcop-pci.c completely (done) | ||
| 1l) use a well working dma IRQ method (done, see 'Known bugs and problems and TODO') | ||
| 1k) cleanup flexcop-files (remove unused EXPORT_SYMBOLs, make static from | ||
| non-static where possible, moved code to proper places) | ||
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| 2) Search for errors in the leftover of flexcop-pci.c (partially done) | ||
| 5a) add MAC address reading | ||
| 5c) feeding of ISOC data to the software demux (format of the isochronous data | ||
| and speed optimization, no real error) (thanks to Vadim Catana) | ||
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| What to do in the near future? | ||
| -------------------------------------- | ||
| (no special order here) | ||
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| 5) USB driver | ||
| 5b) optimize isoc-transfer (submitting/killing isoc URBs when transfer is starting) | ||
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| Testing changes | ||
| --------------- | ||
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| O = item is working | ||
| P = item is partially working | ||
| X = item is not working | ||
| N = item does not apply here | ||
| <empty field> = item need to be examined | ||
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| | PCI | USB | ||
| item | mt352 | nxt2002 | stv0299 | mt312 | mt352 | nxt2002 | stv0299 | mt312 | ||
| -------+-------+---------+---------+-------+-------+---------+---------+------- | ||
| 1a) | O | | | | N | N | N | N | ||
| 1b) | O | | | | | | O | | ||
| 1c) | N | N | | | N | N | O | | ||
| 1d) | O | O | ||
| 1e) | O | O | ||
| 1f) | P | ||
| 1g) | O | ||
| 1h) | P | | ||
| 1i) | O | N | ||
| 1j) | O | N | ||
| 1l) | O | N | ||
| 2) | O | N | ||
| 5a) | N | O | ||
| 5b)* | N | | ||
| 5c) | N | O | ||
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| * - not done yet | ||
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| Known bugs and problems and TODO | ||
| -------------------------------- | ||
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| 1g/h/l) when pid filtering is enabled on the pci card | ||
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| DMA usage currently: | ||
| The DMA is splitted in 2 equal-sized subbuffers. The Flexcop writes to first | ||
| address and triggers an IRQ when it's full and starts writing to the second | ||
| address. When the second address is full, the IRQ is triggered again, and | ||
| the flexcop writes to first address again, and so on. | ||
| The buffersize of each address is currently 640*188 bytes. | ||
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| Problem is, when using hw-pid-filtering and doing some low-bandwidth | ||
| operation (like scanning) the buffers won't be filled enough to trigger | ||
| the IRQ. That's why: | ||
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| When PID filtering is activated, the timer IRQ is used. Every 1.97 ms the IRQ | ||
| is triggered. Is the current write address of DMA1 different to the one | ||
| during the last IRQ, then the data is passed to the demuxer. | ||
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| There is an additional DMA-IRQ-method: packet count IRQ. This isn't | ||
| implemented correctly yet. | ||
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| The solution is to disable HW PID filtering, but I don't know how the DVB | ||
| API software demux behaves on slow systems with 45MBit/s TS. | ||
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| Solved bugs :) | ||
| -------------- | ||
| 1g) pid-filtering (somehow pid index 4 and 5 (EMM_PID and ECM_PID) aren't | ||
| working) | ||
| SOLUTION: also index 0 was affected, because net_translation is done for | ||
| these indexes by default | ||
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| 5b) isochronous transfer does only work in the first attempt (for the Sky2PC | ||
| USB, Air2PC is working) SOLUTION: the flexcop was going asleep and never really | ||
| woke up again (don't know if this need fixes, see | ||
| flexcop-fe-tuner.c:flexcop_sleep) | ||
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| NEWS: when the driver is loaded and unloaded and loaded again (w/o doing | ||
| anything in the while the driver is loaded the first time), no transfers take | ||
| place anymore. | ||
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| Improvements when rewriting (refactoring) is done | ||
| ================================================= | ||
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| - split sleeping of the flexcop (misc_204.ACPI3_sig = 1;) from lnb_control | ||
| (enable sleeping for other demods than dvb-s) | ||
| - add support for CableStar (stv0297 Microtune 203x/ALPS) (almost done, incompatibilities with the Nexus-CA) | ||
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| Debugging | ||
| --------- | ||
| - add verbose debugging to skystar2.c (dump the reg_dw_data) and compare it | ||
| with this flexcop, this is important, because i2c is now using the | ||
| flexcop_ibi_value union from flexcop-reg.h (do you have a better idea for | ||
| that, please tell us so). | ||
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| Everything which is identical in the following table, can be put into a common | ||
| flexcop-module. | ||
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| PCI USB | ||
| ------------------------------------------------------------------------------- | ||
| Different: | ||
| Register access: accessing IO memory USB control message | ||
| I2C bus: I2C bus of the FC USB control message | ||
| Data transfer: DMA isochronous transfer | ||
| EEPROM transfer: through i2c bus not clear yet | ||
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| Identical: | ||
| Streaming: accessing registers | ||
| PID Filtering: accessing registers | ||
| Sram destinations: accessing registers | ||
| Tuner/Demod: I2C bus | ||
| DVB-stuff: can be written for common use | ||
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| Acknowledgements (just for the rewriting part) | ||
| ================ | ||
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| Bjarne Steinsbo thought a lot in the first place of the pci part for this code | ||
| sharing idea. | ||
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| Andreas Oberritter for providing a recent PCI initialization template | ||
| (pluto2.c). | ||
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| Boleslaw Ciesielski for pointing out a problem with firmware loader. | ||
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| Vadim Catana for correcting the USB transfer. | ||
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| comments, critics and ideas to linux-dvb@linuxtv.org. |
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