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| author | Linus Walleij <linus.walleij@stericsson.com> | 2010-11-04 13:06:59 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-11-26 10:59:12 +0000 |
| commit | 65500fa94aaeb3475e39c0c5180f188014164ca4 (patch) | |
| tree | a8385820eaf63769d523c8ed726e0a1f6da081fa /include/linux/amba/bus.h | |
| parent | 283a1b92e25fe3a62c766a042f96dad2eefa7d17 (diff) | |
| download | linux-65500fa94aaeb3475e39c0c5180f188014164ca4.tar.gz linux-65500fa94aaeb3475e39c0c5180f188014164ca4.tar.bz2 linux-65500fa94aaeb3475e39c0c5180f188014164ca4.zip | |
ARM: 6467/1: amba: optional PrimeCell core voltage switch
On some contemporary sub-micron SoCs, peripherals on the chip have
power domain switches, i.e. the voltage to the core may be turned
off to conserve power. In the Ux500 we have this for out PrimeCell
derivates.
This patch makes it possible to specify an (optional) regulator to
handle the voltage domain switch on AMBA PrimeCells, modeled very
similar to how block clocks are handled.
Additional amba_vcore_[enable|disable] calls are supplied to make
it possible introduce optional powering off of the core voltage.
Using this will require code to spool/unspool any core HW state.
Cc: Rabin Vincent <rabin.vincent@stericsson.com>
Cc: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Cc: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/linux/amba/bus.h')
| -rw-r--r-- | include/linux/amba/bus.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h index c6454cca0447..9e7f259346e1 100644 --- a/include/linux/amba/bus.h +++ b/include/linux/amba/bus.h @@ -18,6 +18,7 @@ #include <linux/device.h> #include <linux/err.h> #include <linux/resource.h> +#include <linux/regulator/consumer.h> #define AMBA_NR_IRQS 2 #define AMBA_CID 0xb105f00d @@ -28,6 +29,7 @@ struct amba_device { struct device dev; struct resource res; struct clk *pclk; + struct regulator *vcore; u64 dma_mask; unsigned int periphid; unsigned int irq[AMBA_NR_IRQS]; @@ -71,6 +73,12 @@ void amba_release_regions(struct amba_device *); #define amba_pclk_disable(d) \ do { if (!IS_ERR((d)->pclk)) clk_disable((d)->pclk); } while (0) +#define amba_vcore_enable(d) \ + (IS_ERR((d)->vcore) ? 0 : regulator_enable((d)->vcore)) + +#define amba_vcore_disable(d) \ + do { if (!IS_ERR((d)->vcore)) regulator_disable((d)->vcore); } while (0) + /* Some drivers don't use the struct amba_device */ #define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff) #define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f) |