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authorLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 21:01:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 21:01:11 -0700
commit0fc2f137226eff4c9dd90864dda5c237474c3ec5 (patch)
tree50ec67f1f9d144a3ceb5ccff45a37bc5005f6c3d /Documentation
parentdcded10f6dce10411b16134ce9cc87bfdf75c13f (diff)
parentaab2393e2ec52c74b419af7c26a12e21584e483b (diff)
downloadkernel-0fc2f137226eff4c9dd90864dda5c237474c3ec5.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin: (32 commits) Blackfin: gpio: add a debounce stub Blackfin: update defconfigs Blackfin: remove CONFIG_MEM_GENERIC_BOARD Blackfin: dpmc: punt unnecessary RTC_ISTAT clearing Blackfin: unify rotary encoder bitmasks Blackfin: unify SDH/RSI bitmasks Blackfin: BF54x: tweak DMAC MMR naming to match other ports Blackfin: TWI: clean up the MMR names Blackfin: add EVT_OVERRIDE/IPRIO core MMR helpers Blackfin: add support for dynamic ftrace Blackfin: add support for LZO compressed kernels Blackfin: portmux: fix peripheral map overflow when requesting pins Blackfin: document SPI CS limitations with CPHA=0 Blackfin: remove useless and outdated documentation Blackfin: BF51x/BF52x: support GPIO Hysteresis/Schmitt Trigger options Blackfin: gpio/portmux: clean up whitespace corruption Blackfin: make sure mmiowb inserts a write barrier with SSYNC Blackfin: fix DMA/cache bug when resuming from suspend to RAM Blackfin: BF51x: fix handling of PH8 (the "internal" SPI0SEL4 pin) Blackfin: add a GPIO_DEFAULT_BOOT_SPI_CS ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/blackfin/00-INDEX11
-rw-r--r--Documentation/blackfin/Filesystems169
-rw-r--r--Documentation/blackfin/bfin-spi-notes.txt14
-rw-r--r--Documentation/blackfin/cachefeatures.txt55
4 files changed, 18 insertions, 231 deletions
diff --git a/Documentation/blackfin/00-INDEX b/Documentation/blackfin/00-INDEX
index c34e12440fec..2df0365f2dff 100644
--- a/Documentation/blackfin/00-INDEX
+++ b/Documentation/blackfin/00-INDEX
@@ -1,11 +1,8 @@
00-INDEX
- This file
-cachefeatures.txt
- - Supported cache features.
-
-Filesystems
- - Requirements for mounting the root file system.
-
-bfin-gpio-note.txt
+bfin-gpio-notes.txt
- Notes in developing/using bfin-gpio driver.
+
+bfin-spi-notes.txt
+ - Notes for using bfin spi bus driver.
diff --git a/Documentation/blackfin/Filesystems b/Documentation/blackfin/Filesystems
deleted file mode 100644
index 51260a1b8032..000000000000
--- a/Documentation/blackfin/Filesystems
+++ /dev/null
@@ -1,169 +0,0 @@
-/*
- * File: Documentation/blackfin/Filesystems
- * Based on:
- * Author:
- *
- * Created:
- * Description: This file contains the simple DMA Implementation for Blackfin
- *
- * Rev: $Id: Filesystems 2384 2006-11-01 04:12:43Z magicyang $
- *
- * Modified:
- * Copyright 2004-2006 Analog Devices Inc.
- *
- * Bugs: Enter bugs at http://blackfin.uclinux.org/
- *
- */
-
- How to mount the root file system in uClinux/Blackfin
- -----------------------------------------------------
-
-1 Mounting EXT3 File system.
- ------------------------
-
- Creating an EXT3 File system for uClinux/Blackfin:
-
-
-Please follow the steps to form the EXT3 File system and mount the same as root
-file system.
-
-a Make an ext3 file system as large as you want the final root file
- system.
-
- mkfs.ext3 /dev/ram0 <your-rootfs-size-in-1k-blocks>
-
-b Mount this Empty file system on a free directory as:
-
- mount -t ext3 /dev/ram0 ./test
- where ./test is the empty directory.
-
-c Copy your root fs directory that you have so carefully made over.
-
- cp -af /tmp/my_final_rootfs_files/* ./test
-
- (For ex: cp -af uClinux-dist/romfs/* ./test)
-
-d If you have done everything right till now you should be able to see
- the required "root" dir's (that's etc, root, bin, lib, sbin...)
-
-e Now unmount the file system
-
- umount ./test
-
-f Create the root file system image.
-
- dd if=/dev/ram0 bs=1k count=<your-rootfs-size-in-1k-blocks> \
- > ext3fs.img
-
-
-Now you have to tell the kernel that will be mounting this file system as
-rootfs.
-So do a make menuconfig under kernel and select the Ext3 journaling file system
-support under File system --> submenu.
-
-
-2. Mounting EXT2 File system.
- -------------------------
-
-By default the ext2 file system image will be created if you invoke make from
-the top uClinux-dist directory.
-
-
-3. Mounting CRAMFS File System
- ----------------------------
-
-To create a CRAMFS file system image execute the command
-
- mkfs.cramfs ./test cramfs.img
-
- where ./test is the target directory.
-
-
-4. Mounting ROMFS File System
- --------------------------
-
-To create a ROMFS file system image execute the command
-
- genromfs -v -V "ROMdisk" -f romfs.img -d ./test
-
- where ./test is the target directory
-
-
-5. Mounting the JFFS2 Filesystem
- -----------------------------
-
-To create a compressed JFFS filesystem (JFFS2), please execute the command
-
- mkfs.jffs2 -d ./test -o jffs2.img
-
- where ./test is the target directory.
-
-However, please make sure the following is in your kernel config.
-
-/*
- * RAM/ROM/Flash chip drivers
- */
-#define CONFIG_MTD_CFI 1
-#define CONFIG_MTD_ROM 1
-/*
- * Mapping drivers for chip access
- */
-#define CONFIG_MTD_COMPLEX_MAPPINGS 1
-#define CONFIG_MTD_BF533 1
-#undef CONFIG_MTD_UCLINUX
-
-Through the u-boot boot loader, use the jffs2.img in the corresponding
-partition made in linux-2.6.x/drivers/mtd/maps/bf533_flash.c.
-
-NOTE - Currently the Flash driver is available only for EZKIT. Watch out for a
- STAMP driver soon.
-
-
-6. Mounting the NFS File system
- -----------------------------
-
- For mounting the NFS please do the following in the kernel config.
-
- In Networking Support --> Networking options --> TCP/IP networking -->
- IP: kernel level autoconfiguration
-
- Enable BOOTP Support.
-
- In Kernel hacking --> Compiled-in kernel boot parameter add the following
-
- root=/dev/nfs rw ip=bootp
-
- In File system --> Network File system, Enable
-
- NFS file system support --> NFSv3 client support
- Root File system on NFS
-
- in uClibc menuconfig, do the following
- In Networking Support
- enable Remote Procedure Call (RPC) support
- Full RPC Support
-
- On the Host side, ensure that /etc/dhcpd.conf looks something like this
-
- ddns-update-style ad-hoc;
- allow bootp;
- subnet 10.100.4.0 netmask 255.255.255.0 {
- default-lease-time 122209600;
- max-lease-time 31557600;
- group {
- host bf533 {
- hardware ethernet 00:CF:52:49:C3:01;
- fixed-address 10.100.4.50;
- option root-path "/home/nfsmount";
- }
- }
-
- ensure that /etc/exports looks something like this
- /home/nfsmount *(rw,no_root_squash,no_all_squash)
-
- run the following commands as root (may differ depending on your
- distribution) :
- - service nfs start
- - service portmap start
- - service dhcpd start
- - /usr/sbin/exportfs
diff --git a/Documentation/blackfin/bfin-spi-notes.txt b/Documentation/blackfin/bfin-spi-notes.txt
new file mode 100644
index 000000000000..556fa877f2e8
--- /dev/null
+++ b/Documentation/blackfin/bfin-spi-notes.txt
@@ -0,0 +1,14 @@
+SPI Chip Select behavior:
+
+With the Blackfin on-chip SPI peripheral, there is some logic tied to the CPHA
+bit whether the Slave Select Line is controlled by hardware (CPHA=0) or
+controlled by software (CPHA=1). However, the Linux SPI bus driver assumes that
+the Slave Select is always under software control and being asserted during
+the entire SPI transfer. - And not just bits_per_word duration.
+
+In most cases you can utilize SPI MODE_3 instead of MODE_0 to work-around this
+behavior. If your SPI slave device in question requires SPI MODE_0 or MODE_2
+timing, you can utilize the GPIO controlled SPI Slave Select option instead.
+
+You can even use the same pin whose peripheral role is a SSEL,
+but use it as a GPIO instead.
diff --git a/Documentation/blackfin/cachefeatures.txt b/Documentation/blackfin/cachefeatures.txt
deleted file mode 100644
index 75de51f94515..000000000000
--- a/Documentation/blackfin/cachefeatures.txt
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- * File: Documentation/blackfin/cachefeatures.txt
- * Based on:
- * Author:
- *
- * Created:
- * Description: This file contains the simple DMA Implementation for Blackfin
- *
- * Rev: $Id: cachefeatures.txt 2384 2006-11-01 04:12:43Z magicyang $
- *
- * Modified:
- * Copyright 2004-2006 Analog Devices Inc.
- *
- * Bugs: Enter bugs at http://blackfin.uclinux.org/
- *
- */
-
- - Instruction and Data cache initialization.
- icache_init();
- dcache_init();
-
- - Instruction and Data cache Invalidation Routines, when flushing the
- same is not required.
- _icache_invalidate();
- _dcache_invalidate();
-
- Also, for invalidating the entire instruction and data cache, the below
- routines are provided (another method for invalidation, refer page no 267 and 287 of
- ADSP-BF533 Hardware Reference manual)
-
- invalidate_entire_dcache();
- invalidate_entire_icache();
-
- -External Flushing of Instruction and data cache routines.
-
- flush_instruction_cache();
- flush_data_cache();
-
- - Internal Flushing of Instruction and Data Cache.
-
- icplb_flush();
- dcplb_flush();
-
- - Miscellaneous cache functions.
-
- flush_cache_all();
- flush_cache_mm();
- invalidate_dcache_range();
- flush_dcache_range();
- flush_dcache_page();
- flush_cache_range();
- flush_cache_page();
- invalidate_dcache_range();
- flush_page_to_ram();
-