aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-19 16:18:39 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-19 16:18:39 -0500
commit59b8175c771040afcd4ad67022b0cc80c216b866 (patch)
tree4ef5935bee1e342716d49b9d4b99e3fa835526e6 /Documentation
parent920841d8d1d61bc12b43f95a579a5374f6d98f81 (diff)
parent3b0eb4a195a124567cd0dd6f700f8388def542c6 (diff)
Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (117 commits) [ARM] 4058/2: iop32x: set ->broken_parity_status on n2100 onboard r8169 ports [ARM] 4140/1: AACI stability add ac97 timeout and retries [ARM] 4139/1: AACI record support [ARM] 4138/1: AACI: multiple channel support for IRQ handling [ARM] 4211/1: Provide a defconfig for ns9xxx [ARM] 4210/1: base for new machine type "NetSilicon NS9360" [ARM] 4222/1: S3C2443: Remove reference to missing S3C2443_PM [ARM] 4221/1: S3C2443: DMA support [ARM] 4220/1: S3C24XX: DMA system initialised from sysdev [ARM] 4219/1: S3C2443: DMA source definitions [ARM] 4218/1: S3C2412: fix CONFIG_CPU_S3C2412_ONLY wrt to S3C2443 [ARM] 4217/1: S3C24XX: remove the dma channel show at startup [ARM] 4090/2: avoid clash between PXA and SA1111 defines [ARM] 4216/1: add .gitignore entries for ARM specific files [ARM] 4214/2: S3C2410: Add Armzone QT2410 [ARM] 4215/1: s3c2410 usb device: per-platform vbus_draw [ARM] 4213/1: S3C2410 - Update definition of ADCTSC_XY_PST [ARM] 4098/1: ARM: rtc_lock only used with rtc_cmos [ARM] 4137/1: Add kexec support [ARM] 4201/1: SMP barriers pair needed for the secondary boot process ... Fix up conflict due to typedef removal in sound/arm/aaci.h
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/arm/Samsung-S3C24XX/DMA.txt46
-rw-r--r--Documentation/arm/Samsung-S3C24XX/Overview.txt21
2 files changed, 63 insertions, 4 deletions
diff --git a/Documentation/arm/Samsung-S3C24XX/DMA.txt b/Documentation/arm/Samsung-S3C24XX/DMA.txt
new file mode 100644
index 000000000000..37f4edcc5d87
--- /dev/null
+++ b/Documentation/arm/Samsung-S3C24XX/DMA.txt
@@ -0,0 +1,46 @@
1 S3C2410 DMA
2 ===========
3
4Introduction
5------------
6
7 The kernel provides an interface to manage DMA transfers
8 using the DMA channels in the cpu, so that the central
9 duty of managing channel mappings, and programming the
10 channel generators is in one place.
11
12
13DMA Channel Ordering
14--------------------
15
16 Many of the range do not have connections for the DMA
17 channels to all sources, which means that some devices
18 have a restricted number of channels that can be used.
19
20 To allow flexibilty for each cpu type and board, the
21 dma code can be given an dma ordering structure which
22 allows the order of channel search to be specified, as
23 well as allowing the prohibition of certain claims.
24
25 struct s3c24xx_dma_order has a list of channels, and
26 each channel within has a slot for a list of dma
27 channel numbers. The slots are searched in order, for
28 the presence of a dma channel number with DMA_CH_VALID
29 orred in.
30
31 If the order has the flag DMA_CH_NEVER set, then after
32 checking the channel list, the system will return no
33 found channel, thus denying the request.
34
35 A board support file can call s3c24xx_dma_order_set()
36 to register an complete ordering set. The routine will
37 copy the data, so the original can be discared with
38 __initdata.
39
40
41Authour
42-------
43
44Ben Dooks,
45Copyright (c) 2007 Ben Dooks, Simtec Electronics
46Licensed under the GPL v2
diff --git a/Documentation/arm/Samsung-S3C24XX/Overview.txt b/Documentation/arm/Samsung-S3C24XX/Overview.txt
index 28d014714ab8..c31b76fa66c4 100644
--- a/Documentation/arm/Samsung-S3C24XX/Overview.txt
+++ b/Documentation/arm/Samsung-S3C24XX/Overview.txt
@@ -8,13 +8,10 @@ Introduction
8 8
9 The Samsung S3C24XX range of ARM9 System-on-Chip CPUs are supported 9 The Samsung S3C24XX range of ARM9 System-on-Chip CPUs are supported
10 by the 's3c2410' architecture of ARM Linux. Currently the S3C2410, 10 by the 's3c2410' architecture of ARM Linux. Currently the S3C2410,
11 S3C2440 and S3C2442 devices are supported. 11 S3C2412, S3C2413, S3C2440 and S3C2442 devices are supported.
12 12
13 Support for the S3C2400 series is in progress. 13 Support for the S3C2400 series is in progress.
14 14
15 Support for the S3C2412 and S3C2413 CPUs is being merged.
16
17
18Configuration 15Configuration
19------------- 16-------------
20 17
@@ -26,6 +23,22 @@ Configuration
26 please check the machine specific documentation. 23 please check the machine specific documentation.
27 24
28 25
26Layout
27------
28
29 The core support files are located in the platform code contained in
30 arch/arm/plat-s3c24xx with headers in include/asm-arm/plat-s3c24xx.
31 This directory should be kept to items shared between the platform
32 code (arch/arm/plat-s3c24xx) and the arch/arm/mach-s3c24* code.
33
34 Each cpu has a directory with the support files for it, and the
35 machines that carry the device. For example S3C2410 is contained
36 in arch/arm/mach-s3c2410 and S3C2440 in arch/arm/mach-s3c2440
37
38 Register, kernel and platform data definitions are held in the
39 include/asm-arm/arch-s3c2410 directory.
40
41
29Machines 42Machines
30-------- 43--------
31 44