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From:   Dragan Cvetic <dragan.cvetic@xilinx.com>
To:     <arnd@arndb.de>, <gregkh@linuxfoundation.org>,
        <michal.simek@xilinx.com>, <linux-arm-kernel@lists.infradead.org>
CC:     <linux-kernel@vger.kernel.org>,
        Dragan Cvetic <dragan.cvetic@xilinx.com>,
        Derek Kiernan <derek.kiernan@xilinx.com>
Subject: [PATCH V2 08/12] misc: xilinx_sdfec: Add ability to get/set config
Date:   Tue, 9 Apr 2019 11:06:50 +0100
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- Add capability to get SD-FEC config data using ioctl
XSDFEC_GET_CONFIG.

- Add capability to set SD-FEC data order using ioctl
SDFEC_SET_ORDER.

- Add capability to set SD-FEC bypass option using ioctl
XSDFEC_SET_BYPASS.

- Add capability to set SD-FEC active state using ioctl
XSDFEC_IS_ACTIVE.

Tested-by: Dragan Cvetic <dragan.cvetic@xilinx.com>
Signed-off-by: Derek Kiernan <derek.kiernan@xilinx.com>
Signed-off-by: Dragan Cvetic <dragan.cvetic@xilinx.com>
---
 drivers/misc/xilinx_sdfec.c      | 99 ++++++++++++++++++++++++++++++++++++++++
 include/uapi/misc/xilinx_sdfec.h | 57 +++++++++++++++++++++++
 2 files changed, 156 insertions(+)

diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
index 18e7ae2..560a2ed 100644
--- a/drivers/misc/xilinx_sdfec.c
+++ b/drivers/misc/xilinx_sdfec.c
@@ -306,6 +306,17 @@ static int xsdfec_dev_release(struct inode *iptr, struct file *fptr)
 	return 0;
 }
 
+static int xsdfec_get_config(struct xsdfec_dev *xsdfec, void __user *arg)
+{
+	int err;
+
+	err = copy_to_user(arg, &xsdfec->config, sizeof(xsdfec->config));
+	if (err)
+		err = -EFAULT;
+
+	return err;
+}
+
 static int xsdfec_set_turbo(struct xsdfec_dev *xsdfec, void __user *arg)
 {
 	struct xsdfec_turbo turbo;
@@ -648,6 +659,82 @@ static int xsdfec_add_ldpc(struct xsdfec_dev *xsdfec, void __user *arg)
 	return ret;
 }
 
+static int xsdfec_set_order(struct xsdfec_dev *xsdfec, void __user *arg)
+{
+	bool order_invalid;
+	enum xsdfec_order order;
+	int err;
+
+	err = get_user(order, (enum xsdfec_order *)arg);
+	if (err)
+		return -EFAULT;
+
+	order_invalid = (order != XSDFEC_MAINTAIN_ORDER) &&
+			(order != XSDFEC_OUT_OF_ORDER);
+	if (order_invalid) {
+		dev_err(xsdfec->dev, "%s invalid order value %d for SDFEC%d",
+			__func__, order, xsdfec->config.fec_id);
+		return -EINVAL;
+	}
+
+	/* Verify Device has not started */
+	if (xsdfec->state == XSDFEC_STARTED) {
+		dev_err(xsdfec->dev,
+			"%s attempting to set Order while started for SDFEC%d",
+			__func__, xsdfec->config.fec_id);
+		return -EIO;
+	}
+
+	xsdfec_regwrite(xsdfec, XSDFEC_ORDER_ADDR, order);
+
+	xsdfec->config.order = order;
+
+	return 0;
+}
+
+static int xsdfec_set_bypass(struct xsdfec_dev *xsdfec, bool __user *arg)
+{
+	bool bypass;
+	int err;
+
+	err = get_user(bypass, arg);
+	if (err)
+		return -EFAULT;
+
+	/* Verify Device has not started */
+	if (xsdfec->state == XSDFEC_STARTED) {
+		dev_err(xsdfec->dev,
+			"%s attempting to set bypass while started for SDFEC%d",
+			__func__, xsdfec->config.fec_id);
+		return -EIO;
+	}
+
+	if (bypass)
+		xsdfec_regwrite(xsdfec, XSDFEC_BYPASS_ADDR, 1);
+	else
+		xsdfec_regwrite(xsdfec, XSDFEC_BYPASS_ADDR, 0);
+
+	xsdfec->config.bypass = bypass;
+
+	return 0;
+}
+
+static int xsdfec_is_active(struct xsdfec_dev *xsdfec, bool __user *arg)
+{
+	u32 reg_value;
+	bool is_active;
+	int err;
+
+	reg_value = xsdfec_regread(xsdfec, XSDFEC_ACTIVE_ADDR);
+	/* using a double ! operator instead of casting */
+	is_active = !!(reg_value & XSDFEC_IS_ACTIVITY_SET);
+	err = put_user(is_active, arg);
+	if (err)
+		return -EFAULT;
+
+	return err;
+}
+
 static u32
 xsdfec_translate_axis_width_cfg_val(enum xsdfec_axis_width axis_width_cfg)
 {
@@ -741,6 +828,9 @@ static long xsdfec_dev_ioctl(struct file *fptr, unsigned int cmd,
 	}
 
 	switch (cmd) {
+	case XSDFEC_GET_CONFIG:
+		rval = xsdfec_get_config(xsdfec, arg);
+		break;
 	case XSDFEC_SET_TURBO:
 		rval = xsdfec_set_turbo(xsdfec, arg);
 		break;
@@ -750,6 +840,15 @@ static long xsdfec_dev_ioctl(struct file *fptr, unsigned int cmd,
 	case XSDFEC_ADD_LDPC_CODE_PARAMS:
 		rval = xsdfec_add_ldpc(xsdfec, arg);
 		break;
+	case XSDFEC_SET_ORDER:
+		rval = xsdfec_set_order(xsdfec, arg);
+		break;
+	case XSDFEC_SET_BYPASS:
+		rval = xsdfec_set_bypass(xsdfec, arg);
+		break;
+	case XSDFEC_IS_ACTIVE:
+		rval = xsdfec_is_active(xsdfec, (bool __user *)arg);
+		break;
 	default:
 		/* Should not get here */
 		dev_err(xsdfec->dev, "Undefined SDFEC IOCTL");
diff --git a/include/uapi/misc/xilinx_sdfec.h b/include/uapi/misc/xilinx_sdfec.h
index 53a3e3b..22e9cfe 100644
--- a/include/uapi/misc/xilinx_sdfec.h
+++ b/include/uapi/misc/xilinx_sdfec.h
@@ -315,6 +315,19 @@ xsdfec_calculate_shared_ldpc_table_entry_size(struct xsdfec_ldpc_params *ldpc,
 #define XSDFEC_ADD_LDPC_CODE_PARAMS                                            \
 	_IOW(XSDFEC_MAGIC, 5, struct xsdfec_ldpc_params)
 /**
+ * DOC: XSDFEC_GET_CONFIG
+ * @Parameters
+ *
+ * @struct xsdfec_config *
+ *	Pointer to the &struct xsdfec_config that contains the current
+ *	configuration settings of the SD-FEC Block
+ *
+ * @Description
+ *
+ * ioctl that returns SD-FEC core configuration
+ */
+#define XSDFEC_GET_CONFIG _IOR(XSDFEC_MAGIC, 6, struct xsdfec_config)
+/**
  * DOC: XSDFEC_GET_TURBO
  * @Parameters
  *
@@ -327,4 +340,48 @@ xsdfec_calculate_shared_ldpc_table_entry_size(struct xsdfec_ldpc_params *ldpc,
  * ioctl that returns SD-FEC turbo param values
  */
 #define XSDFEC_GET_TURBO _IOR(XSDFEC_MAGIC, 7, struct xsdfec_turbo)
+/**
+ * DOC: XSDFEC_SET_ORDER
+ * @Parameters
+ *
+ * @struct unsigned long *
+ *	Pointer to the unsigned long that contains a value from the
+ *	@enum xsdfec_order
+ *
+ * @Description
+ *
+ * ioctl that sets order, if order of blocks can change from input to output
+ *
+ * This can only be used when the driver is in the XSDFEC_STOPPED state
+ */
+#define XSDFEC_SET_ORDER _IOW(XSDFEC_MAGIC, 8, unsigned long)
+/**
+ * DOC: XSDFEC_SET_BYPASS
+ * @Parameters
+ *
+ * @struct bool *
+ *	Pointer to bool that sets the bypass value, where false results in
+ *	normal operation and false results in the SD-FEC performing the
+ *	configured operations (same number of cycles) but output data matches
+ *	the input data
+ *
+ * @Description
+ *
+ * ioctl that sets bypass.
+ *
+ * This can only be used when the driver is in the XSDFEC_STOPPED state
+ */
+#define XSDFEC_SET_BYPASS _IOW(XSDFEC_MAGIC, 9, bool)
+/**
+ * DOC: XSDFEC_IS_ACTIVE
+ * @Parameters
+ *
+ * @struct bool *
+ *	Pointer to bool that returns true if the SD-FEC is processing data
+ *
+ * @Description
+ *
+ * ioctl that determines if SD-FEC is processing data
+ */
+#define XSDFEC_IS_ACTIVE _IOR(XSDFEC_MAGIC, 10, bool)
 #endif /* __XILINX_SDFEC_H__ */
-- 
2.7.4