[Qemu-devel] [PATCH for-2.9 29/30] aspeed/scu: add a aspeed_scu_get_clk() helper

["Cédric Le Goater" <clg@kaod.org>]

The clock frequency is defined in the HW STRAP1 register of the SCU
device.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
---
 hw/misc/aspeed_scu.c         | 12 ++++++++++++
 include/hw/misc/aspeed_scu.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/hw/misc/aspeed_scu.c b/hw/misc/aspeed_scu.c
index 95022d3607ad..351b8f79aca0 100644
--- a/hw/misc/aspeed_scu.c
+++ b/hw/misc/aspeed_scu.c
@@ -268,6 +268,18 @@ bool is_supported_silicon_rev(uint32_t silicon_rev)
     return false;
 }
 
+#define ASPEED_PLL_25MHZ    25000000
+#define ASPEED_PLL_24MHZ    24000000
+#define ASPEED_PLL_12MHZ    12000000
+
+uint32_t aspeed_scu_get_clk(AspeedSCUState *scu)
+{
+    if (scu->hw_strap1 & AST2400_CLK_25M_IN)
+        return ASPEED_PLL_25MHZ;
+    else
+        return ASPEED_PLL_24MHZ;
+}
+
 static void aspeed_scu_realize(DeviceState *dev, Error **errp)
 {
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
diff --git a/include/hw/misc/aspeed_scu.h b/include/hw/misc/aspeed_scu.h
index bd4ac013f997..067f9f01819d 100644
--- a/include/hw/misc/aspeed_scu.h
+++ b/include/hw/misc/aspeed_scu.h
@@ -37,6 +37,7 @@ typedef struct AspeedSCUState {
 #define AST2500_A1_SILICON_REV   0x04010303U
 
 extern bool is_supported_silicon_rev(uint32_t silicon_rev);
+extern uint32_t aspeed_scu_get_clk(AspeedSCUState *scu);
 
 /*
  * Extracted from Aspeed SDK v00.03.21. Fixes and extra definitions
-- 
2.7.4