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drivers: firmware: xilinx: Add support for feature check

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Query for corresponding feature before calling EEMI API
from the driver.

Signed-off-by: Ravi Patel <ravi.patel@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
This commit is contained in:
Ravi Patel 2019-11-12 00:35:55 -08:00 committed by Michal Simek
parent e42617b825
commit 461011b1e1
2 changed files with 50 additions and 0 deletions
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43
drivers/firmware/xilinx/zynqmp.c
View File

@ -26,6 +26,9 @@
static const struct zynqmp_eemi_ops *eemi_ops_tbl;
static bool feature_check_enabled;
static u32 zynqmp_pm_features[PM_API_MAX];
static const struct mfd_cell firmware_devs[] = {
{
.name = "zynqmp_power_controller",
@ -44,6 +47,8 @@ static int zynqmp_pm_ret_code(u32 ret_status)
case XST_PM_SUCCESS:
case XST_PM_DOUBLE_REQ:
return 0;
case XST_PM_NO_FEATURE:
return -ENOTSUPP;
case XST_PM_NO_ACCESS:
return -EACCES;
case XST_PM_ABORT_SUSPEND:
@ -126,6 +131,39 @@ static noinline int do_fw_call_hvc(u64 arg0, u64 arg1, u64 arg2,
return zynqmp_pm_ret_code((enum pm_ret_status)res.a0);
}
/**
* zynqmp_pm_feature() - Check weather given feature is supported or not
* @api_id: API ID to check
*
* Return: Returns status, either success or error+reason
*/
static int zynqmp_pm_feature(u32 api_id)
{
int ret;
u32 ret_payload[PAYLOAD_ARG_CNT];
u64 smc_arg[2];
if (!feature_check_enabled)
return 0;
/* Return value if feature is already checked */
if (zynqmp_pm_features[api_id] != PM_FEATURE_UNCHECKED)
return zynqmp_pm_features[api_id];
smc_arg[0] = PM_SIP_SVC | PM_FEATURE_CHECK;
smc_arg[1] = api_id;
ret = do_fw_call(smc_arg[0], smc_arg[1], 0, ret_payload);
if (ret) {
zynqmp_pm_features[api_id] = PM_FEATURE_INVALID;
return PM_FEATURE_INVALID;
}
zynqmp_pm_features[api_id] = ret_payload[1];
return zynqmp_pm_features[api_id];
}
/**
* zynqmp_pm_invoke_fn() - Invoke the system-level platform management layer
* caller function depending on the configuration
@ -160,6 +198,9 @@ int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
*/
u64 smc_arg[4];
if (zynqmp_pm_feature(pm_api_id) == PM_FEATURE_INVALID)
return -ENOTSUPP;
smc_arg[0] = PM_SIP_SVC | pm_api_id;
smc_arg[1] = ((u64)arg1 << 32) | arg0;
smc_arg[2] = ((u64)arg3 << 32) | arg2;
@ -715,6 +756,8 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
np = of_find_compatible_node(NULL, NULL, "xlnx,versal");
if (!np)
return 0;
feature_check_enabled = true;
}
of_node_put(np);

7
include/linux/firmware/xlnx-zynqmp.h
View File

@ -48,6 +48,10 @@
#define ZYNQMP_PM_CAPABILITY_WAKEUP 0x4U
#define ZYNQMP_PM_CAPABILITY_UNUSABLE 0x8U
/* Feature check status */
#define PM_FEATURE_INVALID -1
#define PM_FEATURE_UNCHECKED 0
/*
* Firmware FPGA Manager flags
* XILINX_ZYNQMP_PM_FPGA_FULL: FPGA full reconfiguration
@ -78,11 +82,14 @@ enum pm_api_id {
PM_CLOCK_GETRATE,
PM_CLOCK_SETPARENT,
PM_CLOCK_GETPARENT,
PM_FEATURE_CHECK = 63,
PM_API_MAX,
};
/* PMU-FW return status codes */
enum pm_ret_status {
XST_PM_SUCCESS = 0,
XST_PM_NO_FEATURE = 19,
XST_PM_INTERNAL = 2000,
XST_PM_CONFLICT,
XST_PM_NO_ACCESS,