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powerpc/qe: Implement qe_alive_during_sleep() helper function

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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>
This commit is contained in:
Anton Vorontsov 2009-08-27 07:35:50 +00:00 committed by David S. Miller
parent e0ad2cd8ff
commit ed24157ede
2 changed files with 14 additions and 0 deletions
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1
arch/powerpc/include/asm/qe.h
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@ -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

13
arch/powerpc/sysdev/qe_lib/qe.c
View file

@ -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;