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Linus Torvalds1da177e2005-04-16 15:20:36 -07001 -- Documentation/cdrom/isp16
2
3Docs by Eric van der Maarel <H.T.M.v.d.Maarel@marin.nl>
4
5This is the README for version 0.6 of the cdrom interface on an
6ISP16, MAD16 or Mozart sound card.
7
8The detection and configuration of this interface used to be included
9in both the sjcd and optcd cdrom driver. Drives supported by these
10drivers came packed with Media Magic's multi media kit, which also
11included the ISP16 card. The idea (thanks Leo Spiekman)
12to move it from these drivers into a separate module and moreover, not to
13rely on the MAD16 sound driver, are as follows:
14-duplication of code in the kernel is a waste of resources and should
15 be avoided;
16-however, kernels and notably those included with Linux distributions
17 (cf Slackware 3.0 included version 0.5 of the isp16 configuration
18 code included in the drivers) don't always come with sound support
19 included. Especially when they already include a bunch of cdrom drivers.
20 Hence, the cdrom interface should be configurable _independently_ of
21 sound support.
22
23The ISP16, MAD16 and Mozart sound cards have an OPTi 82C928 or an
24OPTi 82C929 chip. The interface on these cards should work with
25any cdrom attached to the card, which is 'electrically' compatible
26with Sanyo/Panasonic, Sony or Mitsumi non-ide drives. However, the
27command sets for any proprietary drives may differ
28(and hence may not be supported in the kernel) from these four types.
29For a fact I know the interface works and the way of configuration
30as described in this documentation works in combination with the
31sjcd (in Sanyo/Panasonic compatibility mode) cdrom drivers
32(probably with the optcd (in Sony compatibility mode) as well).
33If you have such an OPTi based sound card and you want to use the
34cdrom interface with a cdrom drive supported by any of the other cdrom
35drivers, it will probably work. Please let me know any experience you
36might have).
37I understand that cards based on the OPTi 82C929 chips may be configured
38(hardware jumpers that is) as an IDE interface. Initialisation of such a
39card in this mode is not supported (yet?).
40
41The suggestion to configure the ISP16 etc. sound card by booting DOS and
42do a warm reboot to boot Linux somehow doesn't work, at least not
43on my machine (IPC P90), with the OPTi 82C928 based card.
44
45Booting the kernel through the boot manager LILO allows the use
46of some command line options on the 'LILO boot:' prompt. At boot time
47press Alt or Shift while the LILO prompt is written on the screen and enter
48any kernel options. Alternatively these options may be used in
49the appropriate section in /etc/lilo.conf. Adding 'append="<cmd_line_options>"'
50will do the trick as well.
51The syntax of 'cmd_line_options' is
52
53 isp16=[<port>[,<irq>[,<dma>]]][[,]<drive_type>]
54
55If there is no ISP16 or compatibles detected, there's probably no harm done.
56These options indicate the values that your cdrom drive has been (or will be)
57configured to use.
58Valid values for the base i/o address are:
59 port=0x340,0x320,0x330,0x360
60for the interrupt request number
61 irq=0,3,5,7,9,10,11
62for the direct memory access line
63 dma=0,3,5,6,7
64and for the type of drive
65 drive_type=noisp16,Sanyo,Panasonic,Sony,Mitsumi.
66Note that these options are case sensitive.
67The values 0 for irq and dma indicate that they are not used, and
68the drive will be used in 'polling' mode. The values 5 and 7 for irq
69should be avoided in order to avoid any conflicts with optional
70sound card configuration.
71The syntax of the command line does not allow the specification of
72irq when there's nothing specified for the base address and no
73specification of dma when there is no specification of irq.
74The value 'noisp16' for drive_type, which may be used as the first
75non-integer option value (e.g. 'isp16=noisp16'), makes sure that probing
76for and subsequent configuration of an ISP16-compatible card is skipped
77all together. This can be useful to overcome possible conflicts which
78may arise while the kernel is probing your hardware.
79The default values are
80 port=0x340
81 irq=0
82 dma=0
83 drive_type=Sanyo
84reflecting my own configuration. The defaults can be changed in
85the file linux/drivers/cdrom/ips16.h.
86
87The cdrom interface can be configured at run time by loading the
88initialisation driver as a module. In that case, the interface
89parameters can be set by giving appropriate values on the command
90line. Configuring the driver can then be done by the following
91command (assuming you have iso16.o installed in a proper place):
92
93 insmod isp16.o isp16_cdrom_base=<port> isp16_cdrom_irq=<irq> \
94 isp16_cdrom_dma=<dma> isp16_cdrom_type=<drive_type>
95
96where port, irq, dma and drive_type can have any of the values mentioned
97above.
98
99
100Have fun!