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>
diff --git a/arch/powerpc/include/asm/qe.h b/arch/powerpc/include/asm/qe.h
index 157c5ca..f388f0a 100644
--- a/arch/powerpc/include/asm/qe.h
+++ b/arch/powerpc/include/asm/qe.h
@@ -154,6 +154,7 @@
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 237e365..464271b 100644
--- a/arch/powerpc/sysdev/qe_lib/qe.c
+++ b/arch/powerpc/sysdev/qe_lib/qe.c
@@ -65,6 +65,19 @@
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;