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| author |   Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-08-27 07:35:50 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2009-08-30 21:51:33 -0700 |
| commit | ed24157ede901608e00f28b4897398a373e1e926 (patch) | |
| tree | 9c925bcaf5adb61084719c93ac579e82e6a169b2 /arch/powerpc | |
| parent | ucc_geth: Fix NULL pointer dereference in uec_get_ethtool_stats() (diff) | |
| download | linux-dev-ed24157ede901608e00f28b4897398a373e1e926.tar.xz linux-dev-ed24157ede901608e00f28b4897398a373e1e926.zip | |
powerpc/qe: Implement qe_alive_during_sleep() helper function
In some CPUs (i.e. MPC8569) QE shuts down completely during sleep,
drivers may want to know that to reinitialize registers and buffer
descriptors.
This patch implements qe_alive_during_sleep() helper function, so far
it just checks if MPC8569-compatible power management controller is
present, which is a sign that QE turns off during sleep.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/qe.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/sysdev/qe_lib/qe.c | 13 |
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/qe.h b/arch/powerpc/include/asm/qe.h index 157c5ca581c8..f388f0ab193f 100644 --- a/arch/powerpc/include/asm/qe.h +++ b/arch/powerpc/include/asm/qe.h @@ -154,6 +154,7 @@ int qe_get_snum(void); void qe_put_snum(u8 snum); unsigned int qe_get_num_of_risc(void); unsigned int qe_get_num_of_snums(void); +int qe_alive_during_sleep(void); /* we actually use cpm_muram implementation, define this for convenience */ #define qe_muram_init cpm_muram_init diff --git a/arch/powerpc/sysdev/qe_lib/qe.c b/arch/powerpc/sysdev/qe_lib/qe.c index 237e3654f48c..464271bea6c9 100644 --- a/arch/powerpc/sysdev/qe_lib/qe.c +++ b/arch/powerpc/sysdev/qe_lib/qe.c @@ -65,6 +65,19 @@ static unsigned int qe_num_of_snum; static phys_addr_t qebase = -1; +int qe_alive_during_sleep(void) +{ + static int ret = -1; + + if (ret != -1) + return ret; + + ret = !of_find_compatible_node(NULL, NULL, "fsl,mpc8569-pmc"); + + return ret; +} +EXPORT_SYMBOL(qe_alive_during_sleep); + phys_addr_t get_qe_base(void) { struct device_node *qe; |