OpenE2K/linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
7cfe249475
linux/drivers
History
Russell King 7cfe249475 ARM: AMBA: Add pclk support to AMBA bus infrastructure 
Some platforms gate the pclk (APB - the bus - clock) to the peripherals
for power saving, along with the functional clock.  When devices are
accessed without pclk enabled, the kernel will oops.

This gives them two options:

1. Leave all clocks on all the time.
2. Attempt to gate pclk along with the functional clock.

(With some hardware, pclk and the functional clock are gated by a single
bit in a register.)

(1) has the disadvantage that it causes increased power usage, which is
bad news for battery operated devices.  (2) can lead to kernel oops if
registers are accessed without the functional clock being enabled.

So, introduce the apb_pclk signal in such a way existing drivers don't
need to be updated.  Essentially, this means we guarantee that:

1. pclk will be enabled whenever the driver is bound to a device -
   from probe() to remove() time.
2. pclk will also be enabled when reading the primecell IDs from the device.

In order to allow drivers to be incrementally updated to achieve greater
power savings, we provide two additional calls to allow drivers to
manage the pclk - amba_pclk_enable()/amba_pclk_disable().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-07-31 13:07:27 +01:00
..
accessibility
acpi correct console log level when ERST ACPI table is not found 2010-07-01 18:40:29 -07:00
amba ARM: AMBA: Add pclk support to AMBA bus infrastructure 2010-07-31 13:07:27 +01:00
ata ata_generic: implement ATA_GEN_* flags and force enable DMA on MBP 7,1 2010-07-01 15:34:48 -04:00
atm
auxdisplay
base
block cciss: set SCSI max cmd len to 16, as default is wrong 2010-06-15 08:12:34 +02:00
bluetooth drivers: bluetooth: bluecard_cs.c: Fixed include error, changed to linux/io.h 2010-07-01 21:28:14 -07:00
cdrom
char Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2010-07-01 09:36:49 -07:00
clocksource clocksource: sh_cmt: Fix up bogus shift value. 2010-06-22 16:41:31 +09:00
connector
cpufreq
cpuidle sched: Cure nr_iowait_cpu() users 2010-07-01 09:39:48 +02:00
crypto crypto: crypto4xx - Fix build breakage 2010-06-03 16:57:24 +10:00
dca
dio
dma of/dma: fix build breakage in ppc4xx adma driver 2010-07-02 15:46:17 -06:00
edac Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/i7core 2010-07-04 20:12:06 -07:00
eisa
firewire firewire: core: check for 1394a compliant IRM, fix inaccessibility of Sony camcorder 2010-06-02 19:48:13 +02:00
firmware
gpio drivers/gpio is platform-neutral 2010-06-29 15:29:32 -07:00
gpu drm: correctly update connector DPMS status in drm_fb_helper 2010-07-07 14:21:39 +10:00
hid HID: Send Report ID when numbered reports are sent over the control endpoint. 2010-07-11 23:13:15 +02:00
hwmon hwmon: (coretemp) Properly label the sensors 2010-07-09 16:22:51 +02:00
i2c Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 2010-07-11 13:35:34 -07:00
ide powerpc/macio: Fix probing of macio devices by using the right of match table 2010-06-02 17:50:38 +10:00
idle
ieee1394
ieee802154
infiniband IB/qib: Use request_firmware() to load SD7220 firmware 2010-07-08 13:27:05 -07:00
input input: i8042 - add runtime check in x86's i8042_platform_init 2010-07-07 17:05:07 -07:00
isdn ISDN: hysdn, fix potential NULL dereference 2010-06-26 22:12:02 -07:00
leds i2c: Remove all i2c_set_clientdata(client, NULL) in drivers 2010-06-03 11:33:58 +02:00
lguest
macintosh Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2010-06-03 15:46:37 -07:00
mca
md md/raid5: don't include 'spare' drives when reshaping to fewer devices. 2010-06-24 13:36:04 +10:00
media V4L/DVB: v4l: mem2mem_testdev: fix g_fmt NULL pointer dereference 2010-07-08 16:50:24 -03:00
memstick
message
mfd i2c: Remove all i2c_set_clientdata(client, NULL) in drivers 2010-06-03 11:33:58 +02:00
misc vmware balloon: clamp number of collected non-balloonable pages 2010-06-04 15:21:44 -07:00
mmc mmc: msm: fix compile error on MSM7x30 2010-06-09 08:51:31 -07:00
mtd Merge git://git.infradead.org/~dwmw2/mtd-2.6.35 2010-06-07 17:10:06 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-07-07 19:56:00 -07:00
nubus
of
oprofile
parisc
parport
pci Merge branch 'virtio' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6 2010-06-27 07:49:45 -07:00
pcmcia pcmcia: do not initialize the present flag too late. 2010-07-05 12:37:48 +02:00
platform intel_scu_ipc: Length fix 2010-06-01 08:40:47 -07:00
pnp
power [ARM] pxa/z2: fix missing include in battery driver 2010-06-13 23:55:13 +08:00
pps
ps3
rapidio
regulator i2c: Remove all i2c_set_clientdata(client, NULL) in drivers 2010-06-03 11:33:58 +02:00
rtc rtc: fix ds1388 time corruption 2010-06-29 15:29:31 -07:00
s390 [S390] appldata/extmem/kvm: add missing GFP_KERNEL flag 2010-06-08 18:58:23 +02:00
sbus
scsi Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev 2010-06-03 15:48:15 -07:00
serial serial: cpm_uart: implement the cpm_uart_early_write() function for console poll 2010-06-30 08:15:17 -07:00
sfi SFI: do not return freed pointer 2010-06-01 12:04:35 -04:00
sh sh: Make intc messages consistent via pr_fmt. 2010-06-02 18:10:00 +09:00
sn
spi powerpc/cpm: Reintroduce global spi_pram struct (fixes build issue) 2010-07-11 11:03:22 -05:00
ssb
staging Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6 2010-06-30 15:45:59 -07:00
tc
telephony
thermal
uio
usb V4L/DVB: uvc: Fix multiple symbols definitions with UVC gadget and host drivers 2010-07-11 17:45:10 -03:00
uwb
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-07-07 19:56:00 -07:00
video drivers/video/nuc900fb.c: fix lcd build error 2010-06-29 15:29:32 -07:00
virtio virtio-pci: disable msi at startup 2010-06-23 22:49:07 +09:30
vlynq
w1
watchdog watchdog: at32ap700x_wdt: register misc device last in probe() function 2010-06-17 09:56:57 +00:00
xen xen: avoid allocation causing potential swap activity on the resume path 2010-06-03 09:34:45 +01:00
zorro
Kconfig
Makefile