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Subject[PATCH V7 04/11] misc: xilinx_sdfec: Store driver config and state
Date
Stores configuration based on parameters from the DT
node and values from the SD-FEC core plus reads
the default state from the SD-FEC core. To obtain
values from the core register read, write capabilities
have been added plus related register map details.

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 | 293 +++++++++++++++++++++++++++++++++++++++
include/uapi/misc/xilinx_sdfec.h | 138 ++++++++++++++++++
2 files changed, 431 insertions(+)
create mode 100644 include/uapi/misc/xilinx_sdfec.h

diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
index f257d38..3b031c6 100644
--- a/drivers/misc/xilinx_sdfec.c
+++ b/drivers/misc/xilinx_sdfec.c
@@ -20,11 +20,92 @@
#include <linux/slab.h>
#include <linux/clk.h>

+#include <uapi/misc/xilinx_sdfec.h>
+
#define DEV_NAME_LEN 12

static struct idr dev_idr;
static struct mutex dev_idr_lock;

+/* Xilinx SDFEC Register Map */
+/* CODE_WRI_PROTECT Register */
+#define XSDFEC_CODE_WR_PROTECT_ADDR (0x4)
+
+/* ACTIVE Register */
+#define XSDFEC_ACTIVE_ADDR (0x8)
+#define XSDFEC_IS_ACTIVITY_SET (0x1)
+
+/* AXIS_WIDTH Register */
+#define XSDFEC_AXIS_WIDTH_ADDR (0xC)
+#define XSDFEC_AXIS_DOUT_WORDS_LSB (5)
+#define XSDFEC_AXIS_DOUT_WIDTH_LSB (3)
+#define XSDFEC_AXIS_DIN_WORDS_LSB (2)
+#define XSDFEC_AXIS_DIN_WIDTH_LSB (0)
+
+/* AXIS_ENABLE Register */
+#define XSDFEC_AXIS_ENABLE_ADDR (0x10)
+#define XSDFEC_AXIS_OUT_ENABLE_MASK (0x38)
+#define XSDFEC_AXIS_IN_ENABLE_MASK (0x7)
+#define XSDFEC_AXIS_ENABLE_MASK \
+ (XSDFEC_AXIS_OUT_ENABLE_MASK | XSDFEC_AXIS_IN_ENABLE_MASK)
+
+/* FEC_CODE Register */
+#define XSDFEC_FEC_CODE_ADDR (0x14)
+
+/* ORDER Register Map */
+#define XSDFEC_ORDER_ADDR (0x18)
+
+/* Interrupt Status Register */
+#define XSDFEC_ISR_ADDR (0x1C)
+/* Interrupt Status Register Bit Mask */
+#define XSDFEC_ISR_MASK (0x3F)
+
+/* Write Only - Interrupt Enable Register */
+#define XSDFEC_IER_ADDR (0x20)
+/* Write Only - Interrupt Disable Register */
+#define XSDFEC_IDR_ADDR (0x24)
+/* Read Only - Interrupt Mask Register */
+#define XSDFEC_IMR_ADDR (0x28)
+
+/* ECC Interrupt Status Register */
+#define XSDFEC_ECC_ISR_ADDR (0x2C)
+/* Single Bit Errors */
+#define XSDFEC_ECC_ISR_SBE_MASK (0x7FF)
+/* PL Initialize Single Bit Errors */
+#define XSDFEC_PL_INIT_ECC_ISR_SBE_MASK (0x3C00000)
+/* Multi Bit Errors */
+#define XSDFEC_ECC_ISR_MBE_MASK (0x3FF800)
+/* PL Initialize Multi Bit Errors */
+#define XSDFEC_PL_INIT_ECC_ISR_MBE_MASK (0x3C000000)
+/* Multi Bit Error to Event Shift */
+#define XSDFEC_ECC_ISR_MBE_TO_EVENT_SHIFT (11)
+/* PL Initialize Multi Bit Error to Event Shift */
+#define XSDFEC_PL_INIT_ECC_ISR_MBE_TO_EVENT_SHIFT (4)
+/* ECC Interrupt Status Bit Mask */
+#define XSDFEC_ECC_ISR_MASK (XSDFEC_ECC_ISR_SBE_MASK | XSDFEC_ECC_ISR_MBE_MASK)
+/* ECC Interrupt Status PL Initialize Bit Mask */
+#define XSDFEC_PL_INIT_ECC_ISR_MASK \
+ (XSDFEC_PL_INIT_ECC_ISR_SBE_MASK | XSDFEC_PL_INIT_ECC_ISR_MBE_MASK)
+/* ECC Interrupt Status All Bit Mask */
+#define XSDFEC_ALL_ECC_ISR_MASK \
+ (XSDFEC_ECC_ISR_MASK | XSDFEC_PL_INIT_ECC_ISR_MASK)
+/* ECC Interrupt Status Single Bit Errors Mask */
+#define XSDFEC_ALL_ECC_ISR_SBE_MASK \
+ (XSDFEC_ECC_ISR_SBE_MASK | XSDFEC_PL_INIT_ECC_ISR_SBE_MASK)
+/* ECC Interrupt Status Multi Bit Errors Mask */
+#define XSDFEC_ALL_ECC_ISR_MBE_MASK \
+ (XSDFEC_ECC_ISR_MBE_MASK | XSDFEC_PL_INIT_ECC_ISR_MBE_MASK)
+
+/* Write Only - ECC Interrupt Enable Register */
+#define XSDFEC_ECC_IER_ADDR (0x30)
+/* Write Only - ECC Interrupt Disable Register */
+#define XSDFEC_ECC_IDR_ADDR (0x34)
+/* Read Only - ECC Interrupt Mask Register */
+#define XSDFEC_ECC_IMR_ADDR (0x38)
+
+/* BYPASS Register */
+#define XSDFEC_BYPASS_ADDR (0x3C)
+
/**
* struct xsdfec_clks - For managing SD-FEC clocks
* @core_clk: Main processing clock for core
@@ -51,6 +132,8 @@ struct xsdfec_clks {
* struct xsdfec_dev - Driver data for SDFEC
* @regs: device physical base address
* @dev: pointer to device struct
+ * @state: State of the SDFEC device
+ * @config: Configuration of the SDFEC device
* @miscdev: Misc device handle
* @error_data_lock: Error counter and states spinlock
* @clks: Clocks managed by the SDFEC driver
@@ -62,6 +145,8 @@ struct xsdfec_clks {
struct xsdfec_dev {
void __iomem *regs;
struct device *dev;
+ enum xsdfec_state state;
+ struct xsdfec_config config;
struct miscdevice miscdev;
/* Spinlock to protect state_updated and stats_updated */
spinlock_t error_data_lock;
@@ -70,10 +155,212 @@ struct xsdfec_dev {
int dev_id;
};

+static inline void xsdfec_regwrite(struct xsdfec_dev *xsdfec, u32 addr,
+ u32 value)
+{
+ dev_dbg(xsdfec->dev, "Writing 0x%x to offset 0x%x", value, addr);
+ iowrite32(value, xsdfec->regs + addr);
+}
+
+static inline u32 xsdfec_regread(struct xsdfec_dev *xsdfec, u32 addr)
+{
+ u32 rval;
+
+ rval = ioread32(xsdfec->regs + addr);
+ dev_dbg(xsdfec->dev, "Read value = 0x%x from offset 0x%x", rval, addr);
+ return rval;
+}
+
+static void update_bool_config_from_reg(struct xsdfec_dev *xsdfec,
+ u32 reg_offset, u32 bit_num,
+ char *config_value)
+{
+ u32 reg_val;
+ u32 bit_mask = 1 << bit_num;
+
+ reg_val = xsdfec_regread(xsdfec, reg_offset);
+ *config_value = (reg_val & bit_mask) > 0;
+}
+
+static void update_config_from_hw(struct xsdfec_dev *xsdfec)
+{
+ u32 reg_value;
+ bool sdfec_started;
+
+ /* Update the Order */
+ reg_value = xsdfec_regread(xsdfec, XSDFEC_ORDER_ADDR);
+ xsdfec->config.order = reg_value;
+
+ update_bool_config_from_reg(xsdfec, XSDFEC_BYPASS_ADDR,
+ 0, /* Bit Number, maybe change to mask */
+ &xsdfec->config.bypass);
+
+ update_bool_config_from_reg(xsdfec, XSDFEC_CODE_WR_PROTECT_ADDR,
+ 0, /* Bit Number */
+ &xsdfec->config.code_wr_protect);
+
+ reg_value = xsdfec_regread(xsdfec, XSDFEC_IMR_ADDR);
+ xsdfec->config.irq.enable_isr = (reg_value & XSDFEC_ISR_MASK) > 0;
+
+ reg_value = xsdfec_regread(xsdfec, XSDFEC_ECC_IMR_ADDR);
+ xsdfec->config.irq.enable_ecc_isr =
+ (reg_value & XSDFEC_ECC_ISR_MASK) > 0;
+
+ reg_value = xsdfec_regread(xsdfec, XSDFEC_AXIS_ENABLE_ADDR);
+ sdfec_started = (reg_value & XSDFEC_AXIS_IN_ENABLE_MASK) > 0;
+ if (sdfec_started)
+ xsdfec->state = XSDFEC_STARTED;
+ else
+ xsdfec->state = XSDFEC_STOPPED;
+}
+
+static u32
+xsdfec_translate_axis_width_cfg_val(enum xsdfec_axis_width axis_width_cfg)
+{
+ u32 axis_width_field = 0;
+
+ switch (axis_width_cfg) {
+ case XSDFEC_1x128b:
+ axis_width_field = 0;
+ break;
+ case XSDFEC_2x128b:
+ axis_width_field = 1;
+ break;
+ case XSDFEC_4x128b:
+ axis_width_field = 2;
+ break;
+ }
+
+ return axis_width_field;
+}
+
+static u32 xsdfec_translate_axis_words_cfg_val(enum xsdfec_axis_word_include
+ axis_word_inc_cfg)
+{
+ u32 axis_words_field = 0;
+
+ if (axis_word_inc_cfg == XSDFEC_FIXED_VALUE ||
+ axis_word_inc_cfg == XSDFEC_IN_BLOCK)
+ axis_words_field = 0;
+ else if (axis_word_inc_cfg == XSDFEC_PER_AXI_TRANSACTION)
+ axis_words_field = 1;
+
+ return axis_words_field;
+}
+
+static int xsdfec_cfg_axi_streams(struct xsdfec_dev *xsdfec)
+{
+ u32 reg_value;
+ u32 dout_words_field;
+ u32 dout_width_field;
+ u32 din_words_field;
+ u32 din_width_field;
+ struct xsdfec_config *config = &xsdfec->config;
+
+ /* translate config info to register values */
+ dout_words_field =
+ xsdfec_translate_axis_words_cfg_val(config->dout_word_include);
+ dout_width_field =
+ xsdfec_translate_axis_width_cfg_val(config->dout_width);
+ din_words_field =
+ xsdfec_translate_axis_words_cfg_val(config->din_word_include);
+ din_width_field =
+ xsdfec_translate_axis_width_cfg_val(config->din_width);
+
+ reg_value = dout_words_field << XSDFEC_AXIS_DOUT_WORDS_LSB;
+ reg_value |= dout_width_field << XSDFEC_AXIS_DOUT_WIDTH_LSB;
+ reg_value |= din_words_field << XSDFEC_AXIS_DIN_WORDS_LSB;
+ reg_value |= din_width_field << XSDFEC_AXIS_DIN_WIDTH_LSB;
+
+ xsdfec_regwrite(xsdfec, XSDFEC_AXIS_WIDTH_ADDR, reg_value);
+
+ return 0;
+}
+
static const struct file_operations xsdfec_fops = {
.owner = THIS_MODULE,
};

+static int xsdfec_parse_of(struct xsdfec_dev *xsdfec)
+{
+ struct device *dev = xsdfec->dev;
+ struct device_node *node = dev->of_node;
+ int rval;
+ const char *fec_code;
+ enum xsdfec_axis_width din_width;
+ enum xsdfec_axis_word_include din_word_include;
+ enum xsdfec_axis_width dout_width;
+ enum xsdfec_axis_word_include dout_word_include;
+
+ rval = of_property_read_string(node, "xlnx,sdfec-code", &fec_code);
+ if (rval < 0)
+ return rval;
+
+ if (!strcasecmp(fec_code, "ldpc"))
+ xsdfec->config.code = XSDFEC_LDPC_CODE;
+ else if (!strcasecmp(fec_code, "turbo"))
+ xsdfec->config.code = XSDFEC_TURBO_CODE;
+ else
+ return -EINVAL;
+
+ rval = of_property_read_u32(node, "xlnx,sdfec-din-words",
+ &din_word_include);
+ if (rval < 0)
+ return rval;
+
+ if (din_word_include < XSDFEC_AXIS_WORDS_INCLUDE_MAX)
+ xsdfec->config.din_word_include = din_word_include;
+ else
+ return -EINVAL;
+
+ rval = of_property_read_u32(node, "xlnx,sdfec-din-width", &din_width);
+ if (rval < 0)
+ return rval;
+
+ switch (din_width) {
+ /* Fall through and set for valid values */
+ case XSDFEC_1x128b:
+ case XSDFEC_2x128b:
+ case XSDFEC_4x128b:
+ xsdfec->config.din_width = din_width;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ rval = of_property_read_u32(node, "xlnx,sdfec-dout-words",
+ &dout_word_include);
+ if (rval < 0)
+ return rval;
+
+ if (dout_word_include < XSDFEC_AXIS_WORDS_INCLUDE_MAX)
+ xsdfec->config.dout_word_include = dout_word_include;
+ else
+ return -EINVAL;
+
+ rval = of_property_read_u32(node, "xlnx,sdfec-dout-width", &dout_width);
+ if (rval < 0)
+ return rval;
+
+ switch (dout_width) {
+ /* Fall through and set for valid values */
+ case XSDFEC_1x128b:
+ case XSDFEC_2x128b:
+ case XSDFEC_4x128b:
+ xsdfec->config.dout_width = dout_width;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Write LDPC to CODE Register */
+ xsdfec_regwrite(xsdfec, XSDFEC_FEC_CODE_ADDR, xsdfec->config.code);
+
+ xsdfec_cfg_axi_streams(xsdfec);
+
+ return 0;
+}
+
static int xsdfec_clk_init(struct platform_device *pdev,
struct xsdfec_clks *clks)
{
@@ -260,6 +547,12 @@ static int xsdfec_probe(struct platform_device *pdev)
goto err_xsdfec_dev;
}

+ err = xsdfec_parse_of(xsdfec);
+ if (err < 0)
+ goto err_xsdfec_dev;
+
+ update_config_from_hw(xsdfec);
+
/* Save driver private data */
platform_set_drvdata(pdev, xsdfec);

diff --git a/include/uapi/misc/xilinx_sdfec.h b/include/uapi/misc/xilinx_sdfec.h
new file mode 100644
index 0000000..aec26b3
--- /dev/null
+++ b/include/uapi/misc/xilinx_sdfec.h
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/*
+ * Xilinx SD-FEC
+ *
+ * Copyright (C) 2019 Xilinx, Inc.
+ *
+ * Description:
+ * This driver is developed for SDFEC16 IP. It provides a char device
+ * in sysfs and supports file operations like open(), close() and ioctl().
+ */
+#ifndef __XILINX_SDFEC_H__
+#define __XILINX_SDFEC_H__
+
+#include <linux/types.h>
+
+/**
+ * enum xsdfec_code - Code Type.
+ * @XSDFEC_TURBO_CODE: Driver is configured for Turbo mode.
+ * @XSDFEC_LDPC_CODE: Driver is configured for LDPC mode.
+ *
+ * This enum is used to indicate the mode of the driver. The mode is determined
+ * by checking which codes are set in the driver. Note that the mode cannot be
+ * changed by the driver.
+ */
+enum xsdfec_code {
+ XSDFEC_TURBO_CODE = 0,
+ XSDFEC_LDPC_CODE,
+};
+
+/**
+ * enum xsdfec_order - Order
+ * @XSDFEC_MAINTAIN_ORDER: Maintain order execution of blocks.
+ * @XSDFEC_OUT_OF_ORDER: Out-of-order execution of blocks.
+ *
+ * This enum is used to indicate whether the order of blocks can change from
+ * input to output.
+ */
+enum xsdfec_order {
+ XSDFEC_MAINTAIN_ORDER = 0,
+ XSDFEC_OUT_OF_ORDER,
+};
+
+/**
+ * enum xsdfec_state - State.
+ * @XSDFEC_INIT: Driver is initialized.
+ * @XSDFEC_STARTED: Driver is started.
+ * @XSDFEC_STOPPED: Driver is stopped.
+ * @XSDFEC_NEEDS_RESET: Driver needs to be reset.
+ * @XSDFEC_PL_RECONFIGURE: Programmable Logic needs to be recofigured.
+ *
+ * This enum is used to indicate the state of the driver.
+ */
+enum xsdfec_state {
+ XSDFEC_INIT = 0,
+ XSDFEC_STARTED,
+ XSDFEC_STOPPED,
+ XSDFEC_NEEDS_RESET,
+ XSDFEC_PL_RECONFIGURE,
+};
+
+/**
+ * enum xsdfec_axis_width - AXIS_WIDTH.DIN Setting for 128-bit width.
+ * @XSDFEC_1x128b: DIN data input stream consists of a 128-bit lane
+ * @XSDFEC_2x128b: DIN data input stream consists of two 128-bit lanes
+ * @XSDFEC_4x128b: DIN data input stream consists of four 128-bit lanes
+ *
+ * This enum is used to indicate the AXIS_WIDTH.DIN setting for 128-bit width.
+ * The number of lanes of the DIN data input stream depends upon the
+ * AXIS_WIDTH.DIN parameter.
+ */
+enum xsdfec_axis_width {
+ XSDFEC_1x128b = 1,
+ XSDFEC_2x128b = 2,
+ XSDFEC_4x128b = 4,
+};
+
+/**
+ * enum xsdfec_axis_word_include - Words Configuration.
+ * @XSDFEC_FIXED_VALUE: Fixed, the DIN_WORDS AXI4-Stream interface is removed
+ * from the IP instance and is driven with the specified
+ * number of words.
+ * @XSDFEC_IN_BLOCK: In Block, configures the IP instance to expect a single
+ * DIN_WORDS value per input code block. The DIN_WORDS
+ * interface is present.
+ * @XSDFEC_PER_AXI_TRANSACTION: Per Transaction, configures the IP instance to
+ * expect one DIN_WORDS value per input transaction on the DIN interface. The
+ * DIN_WORDS interface is present.
+ * @XSDFEC_AXIS_WORDS_INCLUDE_MAX: Used to indicate out of bound Words
+ * Configurations.
+ *
+ * This enum is used to specify the DIN_WORDS configuration.
+ */
+enum xsdfec_axis_word_include {
+ XSDFEC_FIXED_VALUE = 0,
+ XSDFEC_IN_BLOCK,
+ XSDFEC_PER_AXI_TRANSACTION,
+ XSDFEC_AXIS_WORDS_INCLUDE_MAX,
+};
+
+/**
+ * struct xsdfec_irq - Enabling or Disabling Interrupts.
+ * @enable_isr: If true enables the ISR
+ * @enable_ecc_isr: If true enables the ECC ISR
+ */
+struct xsdfec_irq {
+ __s8 enable_isr;
+ __s8 enable_ecc_isr;
+};
+
+/**
+ * struct xsdfec_config - Configuration of SD-FEC core.
+ * @code: The codes being used by the SD-FEC instance
+ * @order: Order of Operation
+ * @bypass: Is the core being bypassed
+ * @code_wr_protect: Is write protection of LDPC codes enabled
+ * @din_width: Width of the DIN AXI4-Stream
+ * @din_word_include: How DIN_WORDS are inputted
+ * @dout_width: Width of the DOUT AXI4-Stream
+ * @dout_word_include: HOW DOUT_WORDS are outputted
+ * @irq: Enabling or disabling interrupts
+ */
+struct xsdfec_config {
+ __u32 code;
+ __u32 order;
+ __s8 bypass;
+ __s8 code_wr_protect;
+ __u32 din_width;
+ __u32 din_word_include;
+ __u32 dout_width;
+ __u32 dout_word_include;
+ struct xsdfec_irq irq;
+};
+
+/*
+ * XSDFEC IOCTL List
+ */
+#define XSDFEC_MAGIC 'f'
+#endif /* __XILINX_SDFEC_H__ */
--
2.7.4
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