[Xen-devel] [RFC v1 5/6] xen/arm: zynqmp: Forward plaform specific firmware calls

["Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxx>]

From: "Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxxx>

Forward platform specific firmware calls from the hardware
domain to firmware.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xxxxxxxxxx>
---
 xen/arch/arm/platforms/xilinx-zynqmp.c | 63 ++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/xen/arch/arm/platforms/xilinx-zynqmp.c 
b/xen/arch/arm/platforms/xilinx-zynqmp.c
index 2adee91..bde7f52 100644
--- a/xen/arch/arm/platforms/xilinx-zynqmp.c
+++ b/xen/arch/arm/platforms/xilinx-zynqmp.c
@@ -19,6 +19,46 @@
 
 #include <asm/platform.h>
 
+/* Service calls.  */
+#define SVC_MASK             0x3F000000
+#define SVC_SIP              0x02000000    /* SoC Implementation Specific.  */
+
+/* SMC function IDs for SiP Service queries */
+#define ZYNQMP_SIP_SVC_CALL_COUNT       0xff00
+#define ZYNQMP_SIP_SVC_UID              0xff01
+#define ZYNQMP_SIP_SVC_VERSION          0xff03
+
+enum pm_api_id {
+    /* Miscellaneous API functions: */
+    GET_API_VERSION = 1,
+    SET_CONFIGURATION,
+    GET_NODE_STATUS,
+    GET_OPERATING_CHARACTERISTIC,
+    REGISTER_NOTIFIER,
+    /* API for suspending of PUs: */
+    REQUEST_SUSPEND,
+    SELF_SUSPEND,
+    FORCE_POWERDOWN,
+    ABORT_SUSPEND,
+    REQUEST_WAKEUP,
+    SET_WAKEUP_SOURCE,
+    SYSTEM_SHUTDOWN,
+    /* API for managing PM slaves: */
+    REQUEST_NODE,
+    RELEASE_NODE,
+    SET_REQUIREMENT,
+    SET_MAX_LATENCY,
+    /* Direct control API functions: */
+    RESET_ASSERT,
+    RESET_GET_STATUS,
+    MMIO_WRITE,
+    MMIO_READ,
+    PM_INIT,
+    FPGA_LOAD,
+    FPGA_GET_STATUS,
+    GET_CHIPID,
+};
+
 static const char * const zynqmp_dt_compat[] __initconst =
 {
     "xlnx,zynqmp",
@@ -32,8 +72,31 @@ static const struct dt_device_match zynqmp_blacklist_dev[] 
__initconst =
     { /* sentinel */ },
 };
 
+bool zynqmp_hvc(struct cpu_user_regs *regs)
+{
+    uint32_t fid = regs->x0;
+    uint32_t svc = fid & SVC_MASK;
+    register_t ret[4];
+
+    /* We only forward SiP service calls from the hw domain to firmware.  */
+    if ( svc != SVC_SIP || !is_hardware_domain(current->domain) )
+        return false;
+
+    /* Forward the call.  */
+    call_smcc64(regs->x0, regs->x1, regs->x2, regs->x3,
+                regs->x4, regs->x5, regs->x6, ret);
+
+    /* Transfer return values into guest registers.  */
+    regs->x0 = ret[0];
+    regs->x1 = ret[1];
+    regs->x2 = ret[2];
+    regs->x3 = ret[3];
+    return true;
+}
+
 PLATFORM_START(xgene_storm, "Xilinx ZynqMP")
     .compatible = zynqmp_dt_compat,
+    .hvc = zynqmp_hvc,
     .blacklist_dev = zynqmp_blacklist_dev,
 PLATFORM_END
 
-- 
2.7.4


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