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Subject[PATCH 1/3] firmware: xilinx: Add SDIO Tap Delay API
Date
Add API for setting SDIO Tap Delays on ZynqMP platforms.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
---
drivers/firmware/xilinx/zynqmp.c | 32 ++++++++++++++++++++++++++++++++
include/linux/firmware/xlnx-zynqmp.h | 17 ++++++++++++++++-
2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index fd3d837..c6f9e72 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -664,6 +664,37 @@ static int zynqmp_pm_set_requirement(const u32 node, const u32 capabilities,
qos, ack, NULL);
}

+/**
+ * zynqmp_pm_sdio_setphase() - PM call to set clock delays for SD clock
+ * @device_id: Device ID of the SD controller
+ * @degrees: Tap Delay value in degrees for Input/Output clocks
+ *
+ * This API function is to be used for setting the clock delays for SD
+ * clock.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_sdio_setphase(u32 device_id, int degrees)
+{
+ u32 node_id = (!device_id) ? NODE_SD_0 : NODE_SD_1;
+ enum tap_delay_type tap_type;
+ int ret;
+
+ if (degrees < INPUT_TAP_BOUNDARY) {
+ tap_type = PM_TAPDELAY_INPUT;
+ } else {
+ tap_type = PM_TAPDELAY_OUTPUT;
+ degrees -= INPUT_TAP_BOUNDARY;
+ }
+
+ ret = zynqmp_pm_ioctl(node_id, IOCTL_SET_SD_TAPDELAY, tap_type,
+ degrees, NULL);
+ if (ret)
+ pr_err("Error setting Tap Delay\n");
+
+ return ret;
+}
+
static const struct zynqmp_eemi_ops eemi_ops = {
.get_api_version = zynqmp_pm_get_api_version,
.get_chipid = zynqmp_pm_get_chipid,
@@ -687,6 +718,7 @@ static const struct zynqmp_eemi_ops eemi_ops = {
.set_requirement = zynqmp_pm_set_requirement,
.fpga_load = zynqmp_pm_fpga_load,
.fpga_get_status = zynqmp_pm_fpga_get_status,
+ .sdio_setphase = zynqmp_pm_sdio_setphase,
};

/**
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 1262ea6..0fc4bf7 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -56,6 +56,9 @@
#define XILINX_ZYNQMP_PM_FPGA_FULL 0x0U
#define XILINX_ZYNQMP_PM_FPGA_PARTIAL BIT(0)

+/* Input Tap Delay Boundary Value */
+#define INPUT_TAP_BOUNDARY 0x100
+
enum pm_api_id {
PM_GET_API_VERSION = 1,
PM_REQUEST_NODE = 13,
@@ -92,7 +95,8 @@ enum pm_ret_status {
};

enum pm_ioctl_id {
- IOCTL_SET_PLL_FRAC_MODE = 8,
+ IOCTL_SET_SD_TAPDELAY = 7,
+ IOCTL_SET_PLL_FRAC_MODE,
IOCTL_GET_PLL_FRAC_MODE,
IOCTL_SET_PLL_FRAC_DATA,
IOCTL_GET_PLL_FRAC_DATA,
@@ -251,6 +255,16 @@ enum zynqmp_pm_request_ack {
ZYNQMP_PM_REQUEST_ACK_NON_BLOCKING,
};

+enum pm_node_id {
+ NODE_SD_0 = 39,
+ NODE_SD_1,
+};
+
+enum tap_delay_type {
+ PM_TAPDELAY_INPUT = 0,
+ PM_TAPDELAY_OUTPUT,
+};
+
/**
* struct zynqmp_pm_query_data - PM query data
* @qid: query ID
@@ -295,6 +309,7 @@ struct zynqmp_eemi_ops {
const u32 capabilities,
const u32 qos,
const enum zynqmp_pm_request_ack ack);
+ int (*sdio_setphase)(u32 device_id, int degrees);
};

int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
--
2.1.1
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