[PATCH V5 XRT Alveo 16/20] fpga: xrt: clock driver

Lizhi Hou
2021-04-27T21:01:40Z

Add clock driver. Clock is a hardware function discovered by walking
xclbin metadata. A xrt device node will be created for it. Other part of
driver configures clock through clock driver.

Signed-off-by: Sonal Santan <sonal.santan@xilinx.com>
Signed-off-by: Max Zhen <max.zhen@xilinx.com>
Signed-off-by: Lizhi Hou <lizhi.hou@xilinx.com>
---
drivers/fpga/xrt/include/xleaf/clock.h | 29 ++
drivers/fpga/xrt/lib/xleaf/clock.c | 652 +++++++++++++++++++++++++
2 files changed, 681 insertions(+)
create mode 100644 drivers/fpga/xrt/include/xleaf/clock.h
create mode 100644 drivers/fpga/xrt/lib/xleaf/clock.c

diff --git a/drivers/fpga/xrt/include/xleaf/clock.h b/drivers/fpga/xrt/include/xleaf/clock.h
new file mode 100644
index 000000000000..6858473fd096
--- /dev/null
+++ b/drivers/fpga/xrt/include/xleaf/clock.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Lizhi Hou <Lizhi.Hou@xilinx.com>
+ */
+
+#ifndef _XRT_CLOCK_H_
+#define _XRT_CLOCK_H_
+
+#include "xleaf.h"
+#include <linux/xrt/xclbin.h>
+
+/*
+ * CLOCK driver leaf calls.
+ */
+enum xrt_clock_leaf_cmd {
+ XRT_CLOCK_SET = XRT_XLEAF_CUSTOM_BASE, /* See comments in xleaf.h */
+ XRT_CLOCK_GET,
+ XRT_CLOCK_VERIFY,
+};
+
+struct xrt_clock_get {
+ u16 freq;
+ u32 freq_cnter;
+};
+
+#endif /* _XRT_CLOCK_H_ */
diff --git a/drivers/fpga/xrt/lib/xleaf/clock.c b/drivers/fpga/xrt/lib/xleaf/clock.c
new file mode 100644
index 000000000000..7303be55c07a
--- /dev/null
+++ b/drivers/fpga/xrt/lib/xleaf/clock.c
@@ -0,0 +1,652 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Alveo FPGA Clock Wizard Driver
+ *
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Lizhi Hou<Lizhi.Hou@xilinx.com>
+ * Sonal Santan <sonals@xilinx.com>
+ * David Zhang <davidzha@xilinx.com>
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <linux/io.h>
+#include "metadata.h"
+#include "xleaf.h"
+#include "xleaf/clock.h"
+#include "xleaf/clkfreq.h"
+
+/* XRT_CLOCK_MAX_NUM_CLOCKS should be a concept from XCLBIN_ in the future */
+#define XRT_CLOCK_MAX_NUM_CLOCKS 4
+#define XRT_CLOCK_STATUS_MASK 0xffff
+#define XRT_CLOCK_STATUS_MEASURE_START 0x1
+#define XRT_CLOCK_STATUS_MEASURE_DONE 0x2
+
+#define XRT_CLOCK_STATUS_REG 0x4
+#define XRT_CLOCK_CLKFBOUT_REG 0x200
+#define XRT_CLOCK_CLKOUT0_REG 0x208
+#define XRT_CLOCK_LOAD_SADDR_SEN_REG 0x25C
+#define XRT_CLOCK_DEFAULT_EXPIRE_SECS 1
+
+#define CLOCK_ERR(clock, fmt, arg...) \
+ xrt_err((clock)->xdev, fmt "\n", ##arg)
+#define CLOCK_WARN(clock, fmt, arg...) \
+ xrt_warn((clock)->xdev, fmt "\n", ##arg)
+#define CLOCK_INFO(clock, fmt, arg...) \
+ xrt_info((clock)->xdev, fmt "\n", ##arg)
+#define CLOCK_DBG(clock, fmt, arg...) \
+ xrt_dbg((clock)->xdev, fmt "\n", ##arg)
+
+#define XRT_CLOCK "xrt_clock"
+
+XRT_DEFINE_REGMAP_CONFIG(clock_regmap_config);
+
+struct clock {
+ struct xrt_device *xdev;
+ struct regmap *regmap;
+ struct mutex clock_lock; /* clock dev lock */
+
+ const char *clock_ep_name;
+};
+
+/*
+ * Precomputed table with config0 and config2 register values together with
+ * target frequency. The steps are approximately 5 MHz apart. Table is
+ * generated by platform creation tool.
+ */
+static const struct xmgnt_ocl_clockwiz {
+ /* target frequency */
+ u16 ocl;
+ /* config0 register */
+ u32 config0;
+ /* config2 register */
+ u32 config2;
+} frequency_table[] = {
+ /*1275.000*/ { 10, 0x02EE0C01, 0x0001F47F },
+ /*1575.000*/ { 15, 0x02EE0F01, 0x00000069},
+ /*1600.000*/ { 20, 0x00001001, 0x00000050},
+ /*1600.000*/ { 25, 0x00001001, 0x00000040},
+ /*1575.000*/ { 30, 0x02EE0F01, 0x0001F434},
+ /*1575.000*/ { 35, 0x02EE0F01, 0x0000002D},
+ /*1600.000*/ { 40, 0x00001001, 0x00000028},
+ /*1575.000*/ { 45, 0x02EE0F01, 0x00000023},
+ /*1600.000*/ { 50, 0x00001001, 0x00000020},
+ /*1512.500*/ { 55, 0x007D0F01, 0x0001F41B},
+ /*1575.000*/ { 60, 0x02EE0F01, 0x0000FA1A},
+ /*1462.500*/ { 65, 0x02710E01, 0x0001F416},
+ /*1575.000*/ { 70, 0x02EE0F01, 0x0001F416},
+ /*1575.000*/ { 75, 0x02EE0F01, 0x00000015},
+ /*1600.000*/ { 80, 0x00001001, 0x00000014},
+ /*1487.500*/ { 85, 0x036B0E01, 0x0001F411},
+ /*1575.000*/ { 90, 0x02EE0F01, 0x0001F411},
+ /*1425.000*/ { 95, 0x00FA0E01, 0x0000000F},
+ /*1600.000*/ { 100, 0x00001001, 0x00000010},
+ /*1575.000*/ { 105, 0x02EE0F01, 0x0000000F},
+ /*1512.500*/ { 110, 0x007D0F01, 0x0002EE0D},
+ /*1437.500*/ { 115, 0x01770E01, 0x0001F40C},
+ /*1575.000*/ { 120, 0x02EE0F01, 0x00007D0D},
+ /*1562.500*/ { 125, 0x02710F01, 0x0001F40C},
+ /*1462.500*/ { 130, 0x02710E01, 0x0000FA0B},
+ /*1350.000*/ { 135, 0x01F40D01, 0x0000000A},
+ /*1575.000*/ { 140, 0x02EE0F01, 0x0000FA0B},
+ /*1450.000*/ { 145, 0x01F40E01, 0x0000000A},
+ /*1575.000*/ { 150, 0x02EE0F01, 0x0001F40A},
+ /*1550.000*/ { 155, 0x01F40F01, 0x0000000A},
+ /*1600.000*/ { 160, 0x00001001, 0x0000000A},
+ /*1237.500*/ { 165, 0x01770C01, 0x0001F407},
+ /*1487.500*/ { 170, 0x036B0E01, 0x0002EE08},
+ /*1575.000*/ { 175, 0x02EE0F01, 0x00000009},
+ /*1575.000*/ { 180, 0x02EE0F01, 0x0002EE08},
+ /*1387.500*/ { 185, 0x036B0D01, 0x0001F407},
+ /*1425.000*/ { 190, 0x00FA0E01, 0x0001F407},
+ /*1462.500*/ { 195, 0x02710E01, 0x0001F407},
+ /*1600.000*/ { 200, 0x00001001, 0x00000008},
+ /*1537.500*/ { 205, 0x01770F01, 0x0001F407},
+ /*1575.000*/ { 210, 0x02EE0F01, 0x0001F407},
+ /*1075.000*/ { 215, 0x02EE0A01, 0x00000005},
+ /*1512.500*/ { 220, 0x007D0F01, 0x00036B06},
+ /*1575.000*/ { 225, 0x02EE0F01, 0x00000007},
+ /*1437.500*/ { 230, 0x01770E01, 0x0000FA06},
+ /*1175.000*/ { 235, 0x02EE0B01, 0x00000005},
+ /*1500.000*/ { 240, 0x00000F01, 0x0000FA06},
+ /*1225.000*/ { 245, 0x00FA0C01, 0x00000005},
+ /*1562.500*/ { 250, 0x02710F01, 0x0000FA06},
+ /*1275.000*/ { 255, 0x02EE0C01, 0x00000005},
+ /*1462.500*/ { 260, 0x02710E01, 0x00027105},
+ /*1325.000*/ { 265, 0x00FA0D01, 0x00000005},
+ /*1350.000*/ { 270, 0x01F40D01, 0x00000005},
+ /*1512.500*/ { 275, 0x007D0F01, 0x0001F405},
+ /*1575.000*/ { 280, 0x02EE0F01, 0x00027105},
+ /*1425.000*/ { 285, 0x00FA0E01, 0x00000005},
+ /*1450.000*/ { 290, 0x01F40E01, 0x00000005},
+ /*1475.000*/ { 295, 0x02EE0E01, 0x00000005},
+ /*1575.000*/ { 300, 0x02EE0F01, 0x0000FA05},
+ /*1525.000*/ { 305, 0x00FA0F01, 0x00000005},
+ /*1550.000*/ { 310, 0x01F40F01, 0x00000005},
+ /*1575.000*/ { 315, 0x02EE0F01, 0x00000005},
+ /*1600.000*/ { 320, 0x00001001, 0x00000005},
+ /*1462.500*/ { 325, 0x02710E01, 0x0001F404},
+ /*1237.500*/ { 330, 0x01770C01, 0x0002EE03},
+ /* 837.500*/ { 335, 0x01770801, 0x0001F402},
+ /*1487.500*/ { 340, 0x036B0E01, 0x00017704},
+ /* 862.500*/ { 345, 0x02710801, 0x0001F402},
+ /*1575.000*/ { 350, 0x02EE0F01, 0x0001F404},
+ /* 887.500*/ { 355, 0x036B0801, 0x0001F402},
+ /*1575.000*/ { 360, 0x02EE0F01, 0x00017704},
+ /* 912.500*/ { 365, 0x007D0901, 0x0001F402},
+ /*1387.500*/ { 370, 0x036B0D01, 0x0002EE03},
+ /*1500.000*/ { 375, 0x00000F01, 0x00000004},
+ /*1425.000*/ { 380, 0x00FA0E01, 0x0002EE03},
+ /* 962.500*/ { 385, 0x02710901, 0x0001F402},
+ /*1462.500*/ { 390, 0x02710E01, 0x0002EE03},
+ /* 987.500*/ { 395, 0x036B0901, 0x0001F402},
+ /*1600.000*/ { 400, 0x00001001, 0x00000004},
+ /*1012.500*/ { 405, 0x007D0A01, 0x0001F402},
+ /*1537.500*/ { 410, 0x01770F01, 0x0002EE03},
+ /*1037.500*/ { 415, 0x01770A01, 0x0001F402},
+ /*1575.000*/ { 420, 0x02EE0F01, 0x0002EE03},
+ /*1487.500*/ { 425, 0x036B0E01, 0x0001F403},
+ /*1075.000*/ { 430, 0x02EE0A01, 0x0001F402},
+ /*1087.500*/ { 435, 0x036B0A01, 0x0001F402},
+ /*1375.000*/ { 440, 0x02EE0D01, 0x00007D03},
+ /*1112.500*/ { 445, 0x007D0B01, 0x0001F402},
+ /*1575.000*/ { 450, 0x02EE0F01, 0x0001F403},
+ /*1137.500*/ { 455, 0x01770B01, 0x0001F402},
+ /*1437.500*/ { 460, 0x01770E01, 0x00007D03},
+ /*1162.500*/ { 465, 0x02710B01, 0x0001F402},
+ /*1175.000*/ { 470, 0x02EE0B01, 0x0001F402},
+ /*1425.000*/ { 475, 0x00FA0E01, 0x00000003},
+ /*1500.000*/ { 480, 0x00000F01, 0x00007D03},
+ /*1212.500*/ { 485, 0x007D0C01, 0x0001F402},
+ /*1225.000*/ { 490, 0x00FA0C01, 0x0001F402},
+ /*1237.500*/ { 495, 0x01770C01, 0x0001F402},
+ /*1562.500*/ { 500, 0x02710F01, 0x00007D03},
+ /*1262.500*/ { 505, 0x02710C01, 0x0001F402},
+ /*1275.000*/ { 510, 0x02EE0C01, 0x0001F402},
+ /*1287.500*/ { 515, 0x036B0C01, 0x0001F402},
+ /*1300.000*/ { 520, 0x00000D01, 0x0001F402},
+ /*1575.000*/ { 525, 0x02EE0F01, 0x00000003},
+ /*1325.000*/ { 530, 0x00FA0D01, 0x0001F402},
+ /*1337.500*/ { 535, 0x01770D01, 0x0001F402},
+ /*1350.000*/ { 540, 0x01F40D01, 0x0001F402},
+ /*1362.500*/ { 545, 0x02710D01, 0x0001F402},
+ /*1512.500*/ { 550, 0x007D0F01, 0x0002EE02},
+ /*1387.500*/ { 555, 0x036B0D01, 0x0001F402},
+ /*1400.000*/ { 560, 0x00000E01, 0x0001F402},
+ /*1412.500*/ { 565, 0x007D0E01, 0x0001F402},
+ /*1425.000*/ { 570, 0x00FA0E01, 0x0001F402},
+ /*1437.500*/ { 575, 0x01770E01, 0x0001F402},
+ /*1450.000*/ { 580, 0x01F40E01, 0x0001F402},
+ /*1462.500*/ { 585, 0x02710E01, 0x0001F402},
+ /*1475.000*/ { 590, 0x02EE0E01, 0x0001F402},
+ /*1487.500*/ { 595, 0x036B0E01, 0x0001F402},
+ /*1575.000*/ { 600, 0x02EE0F01, 0x00027102},
+ /*1512.500*/ { 605, 0x007D0F01, 0x0001F402},
+ /*1525.000*/ { 610, 0x00FA0F01, 0x0001F402},
+ /*1537.500*/ { 615, 0x01770F01, 0x0001F402},
+ /*1550.000*/ { 620, 0x01F40F01, 0x0001F402},
+ /*1562.500*/ { 625, 0x02710F01, 0x0001F402},
+ /*1575.000*/ { 630, 0x02EE0F01, 0x0001F402},
+ /*1587.500*/ { 635, 0x036B0F01, 0x0001F402},
+ /*1600.000*/ { 640, 0x00001001, 0x0001F402},
+ /*1290.000*/ { 645, 0x01F44005, 0x00000002},
+ /*1462.500*/ { 650, 0x02710E01, 0x0000FA02}
+};
+
+static u32 find_matching_freq_config(unsigned short freq,
+ const struct xmgnt_ocl_clockwiz *table,
+ int size)
+{
+ u32 end = size - 1;
+ u32 start = 0;
+ u32 idx;
+
+ if (freq < table[0].ocl)
+ return 0;
+
+ if (freq > table[size - 1].ocl)
+ return size - 1;
+
+ while (start < end) {
+ idx = (start + end) / 2;
+ if (freq == table[idx].ocl)
+ break;
+ if (freq < table[idx].ocl)
+ end = idx;
+ else
+ start = idx + 1;
+ }
+ if (freq < table[idx].ocl)
+ idx--;
+
+ return idx;
+}
+
+static u32 find_matching_freq(u32 freq,
+ const struct xmgnt_ocl_clockwiz *freq_table,
+ int freq_table_size)
+{
+ int idx = find_matching_freq_config(freq, freq_table, freq_table_size);
+
+ return freq_table[idx].ocl;
+}
+
+static inline int clock_wiz_busy(struct clock *clock, int cycle, int interval)
+{
+ u32 val = 0;
+ int count;
+ int ret;
+
+ for (count = 0; count < cycle; count++) {
+ ret = regmap_read(clock->regmap, XRT_CLOCK_STATUS_REG, &val);
+ if (ret) {
+ CLOCK_ERR(clock, "read status failed %d", ret);
+ return ret;
+ }
+ if (val == 1)
+ break;
+
+ mdelay(interval);
+ }
+ if (val != 1) {
+ CLOCK_ERR(clock, "clockwiz is (%u) busy after %d ms",
+ val, cycle * interval);
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+static int get_freq(struct clock *clock, u16 *freq)
+{
+ u32 mul_frac0 = 0;
+ u32 div_frac1 = 0;
+ u32 mul0, div0;
+ u64 input;
+ u32 div1;
+ u32 val;
+ int ret;
+
+ WARN_ON(!mutex_is_locked(&clock->clock_lock));
+
+ ret = regmap_read(clock->regmap, XRT_CLOCK_STATUS_REG, &val);
+ if (ret) {
+ CLOCK_ERR(clock, "read status failed %d", ret);
+ return ret;
+ }
+
+ if ((val & 0x1) == 0) {
+ CLOCK_ERR(clock, "clockwiz is busy %x", val);
+ *freq = 0;
+ return -EBUSY;
+ }
+
+ ret = regmap_read(clock->regmap, XRT_CLOCK_CLKFBOUT_REG, &val);
+ if (ret) {
+ CLOCK_ERR(clock, "read clkfbout failed %d", ret);
+ return ret;
+ }
+
+ div0 = val & 0xff;
+ mul0 = (val & 0xff00) >> 8;
+ if (val & BIT(26)) {
+ mul_frac0 = val >> 16;
+ mul_frac0 &= 0x3ff;
+ }
+
+ /*
+ * Multiply both numerator (mul0) and the denominator (div0) with 1000
+ * to account for fractional portion of multiplier
+ */
+ mul0 *= 1000;
+ mul0 += mul_frac0;
+ div0 *= 1000;
+
+ ret = regmap_read(clock->regmap, XRT_CLOCK_CLKOUT0_REG, &val);
+ if (ret) {
+ CLOCK_ERR(clock, "read clkout0 failed %d", ret);
+ return ret;
+ }
+
+ div1 = val & 0xff;
+ if (val & BIT(18)) {
+ div_frac1 = val >> 8;
+ div_frac1 &= 0x3ff;
+ }
+
+ /*
+ * Multiply both numerator (mul0) and the denominator (div1) with
+ * 1000 to account for fractional portion of divider
+ */
+
+ div1 *= 1000;
+ div1 += div_frac1;
+ div0 *= div1;
+ mul0 *= 1000;
+ if (div0 == 0) {
+ CLOCK_ERR(clock, "clockwiz 0 divider");
+ return 0;
+ }
+
+ input = mul0 * 100;
+ do_div(input, div0);
+ *freq = (u16)input;
+
+ return 0;
+}
+
+static int set_freq(struct clock *clock, u16 freq)
+{
+ int err = 0;
+ u32 idx = 0;
+ u32 val = 0;
+ u32 config;
+
+ mutex_lock(&clock->clock_lock);
+ idx = find_matching_freq_config(freq, frequency_table,
+ ARRAY_SIZE(frequency_table));
+
+ CLOCK_INFO(clock, "New: %d Mhz", freq);
+ err = clock_wiz_busy(clock, 20, 50);
+ if (err)
+ goto fail;
+
+ config = frequency_table[idx].config0;
+ err = regmap_write(clock->regmap, XRT_CLOCK_CLKFBOUT_REG, config);
+ if (err) {
+ CLOCK_ERR(clock, "write clkfbout failed %d", err);
+ goto fail;
+ }
+
+ config = frequency_table[idx].config2;
+ err = regmap_write(clock->regmap, XRT_CLOCK_CLKOUT0_REG, config);
+ if (err) {
+ CLOCK_ERR(clock, "write clkout0 failed %d", err);
+ goto fail;
+ }
+
+ mdelay(10);
+ err = regmap_write(clock->regmap, XRT_CLOCK_LOAD_SADDR_SEN_REG, 7);
+ if (err) {
+ CLOCK_ERR(clock, "write load_saddr_sen failed %d", err);
+ goto fail;
+ }
+
+ mdelay(1);
+ err = regmap_write(clock->regmap, XRT_CLOCK_LOAD_SADDR_SEN_REG, 2);
+ if (err) {
+ CLOCK_ERR(clock, "write saddr failed %d", err);
+ goto fail;
+ }
+
+ CLOCK_INFO(clock, "clockwiz waiting for locked signal");
+
+ err = clock_wiz_busy(clock, 100, 100);
+ if (err) {
+ CLOCK_ERR(clock, "clockwiz MMCM/PLL did not lock");
+ /* restore */
+ regmap_write(clock->regmap, XRT_CLOCK_LOAD_SADDR_SEN_REG, 4);
+ mdelay(10);
+ regmap_write(clock->regmap, XRT_CLOCK_LOAD_SADDR_SEN_REG, 0);
+ goto fail;
+ }
+ regmap_read(clock->regmap, XRT_CLOCK_CLKFBOUT_REG, &val);
+ CLOCK_INFO(clock, "clockwiz CONFIG(0) 0x%x", val);
+ regmap_read(clock->regmap, XRT_CLOCK_CLKOUT0_REG, &val);
+ CLOCK_INFO(clock, "clockwiz CONFIG(2) 0x%x", val);
+
+fail:
+ mutex_unlock(&clock->clock_lock);
+ return err;
+}
+
+static int get_freq_counter(struct clock *clock, u32 *freq)
+{
+ struct xrt_subdev_platdata *pdata = DEV_PDATA(clock->xdev);
+ struct xrt_device *xdev = clock->xdev;
+ struct xrt_device *counter_leaf;
+ const void *counter;
+ int err;
+
+ WARN_ON(!mutex_is_locked(&clock->clock_lock));
+
+ err = xrt_md_get_prop(DEV(xdev), pdata->xsp_dtb, clock->clock_ep_name,
+ NULL, XRT_MD_PROP_CLK_CNT, &counter, NULL);
+ if (err) {
+ xrt_err(xdev, "no counter specified");
+ return err;
+ }
+
+ counter_leaf = xleaf_get_leaf_by_epname(xdev, counter);
+ if (!counter_leaf) {
+ xrt_err(xdev, "can't find counter");
+ return -ENOENT;
+ }
+
+ err = xleaf_call(counter_leaf, XRT_CLKFREQ_READ, freq);
+ if (err)
+ xrt_err(xdev, "can't read counter");
+ xleaf_put_leaf(clock->xdev, counter_leaf);
+
+ return err;
+}
+
+static int clock_get_freq(struct clock *clock, u16 *freq, u32 *freq_cnter)
+{
+ int err = 0;
+
+ mutex_lock(&clock->clock_lock);
+
+ if (err == 0 && freq)
+ err = get_freq(clock, freq);
+
+ if (err == 0 && freq_cnter)
+ err = get_freq_counter(clock, freq_cnter);
+
+ mutex_unlock(&clock->clock_lock);
+ return err;
+}
+
+static int clock_verify_freq(struct clock *clock)
+{
+ u32 lookup_freq, clock_freq_counter, request_in_khz, tolerance;
+ int err = 0;
+ u16 freq;
+
+ mutex_lock(&clock->clock_lock);
+
+ err = get_freq(clock, &freq);
+ if (err) {
+ xrt_err(clock->xdev, "get freq failed, %d", err);
+ goto end;
+ }
+
+ err = get_freq_counter(clock, &clock_freq_counter);
+ if (err) {
+ xrt_err(clock->xdev, "get freq counter failed, %d", err);
+ goto end;
+ }
+
+ lookup_freq = find_matching_freq(freq, frequency_table,
+ ARRAY_SIZE(frequency_table));
+ request_in_khz = lookup_freq * 1000;
+ tolerance = lookup_freq * 50;
+ if (tolerance < abs(clock_freq_counter - request_in_khz)) {
+ CLOCK_ERR(clock,
+ "set clock(%s) failed, request %ukhz, actual %dkhz",
+ clock->clock_ep_name, request_in_khz, clock_freq_counter);
+ err = -EDOM;
+ } else {
+ CLOCK_INFO(clock, "verified clock (%s)", clock->clock_ep_name);
+ }
+
+end:
+ mutex_unlock(&clock->clock_lock);
+ return err;
+}
+
+static int clock_init(struct clock *clock)
+{
+ struct xrt_subdev_platdata *pdata = DEV_PDATA(clock->xdev);
+ const u16 *freq;
+ int err = 0;
+
+ err = xrt_md_get_prop(DEV(clock->xdev), pdata->xsp_dtb,
+ clock->clock_ep_name, NULL, XRT_MD_PROP_CLK_FREQ,
+ (const void **)&freq, NULL);
+ if (err) {
+ xrt_info(clock->xdev, "no default freq");
+ return 0;
+ }
+
+ err = set_freq(clock, be16_to_cpu(*freq));
+
+ return err;
+}
+
+static ssize_t freq_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct clock *clock = xrt_get_drvdata(to_xrt_dev(dev));
+ ssize_t count;
+ u16 freq = 0;
+
+ count = clock_get_freq(clock, &freq, NULL);
+ if (count < 0)
+ return count;
+
+ count = snprintf(buf, 64, "%u\n", freq);
+
+ return count;
+}
+static DEVICE_ATTR_RO(freq);
+
+static struct attribute *clock_attrs[] = {
+ &dev_attr_freq.attr,
+ NULL,
+};
+
+static struct attribute_group clock_attr_group = {
+ .attrs = clock_attrs,
+};
+
+static int
+xrt_clock_leaf_call(struct xrt_device *xdev, u32 cmd, void *arg)
+{
+ struct clock *clock;
+ int ret = 0;
+
+ clock = xrt_get_drvdata(xdev);
+
+ switch (cmd) {
+ case XRT_XLEAF_EVENT:
+ /* Does not handle any event. */
+ break;
+ case XRT_CLOCK_SET: {
+ u16 freq = (u16)(uintptr_t)arg;
+
+ ret = set_freq(clock, freq);
+ break;
+ }
+ case XRT_CLOCK_VERIFY:
+ ret = clock_verify_freq(clock);
+ break;
+ case XRT_CLOCK_GET: {
+ struct xrt_clock_get *get =
+ (struct xrt_clock_get *)arg;
+
+ ret = clock_get_freq(clock, &get->freq, &get->freq_cnter);
+ break;
+ }
+ default:
+ xrt_err(xdev, "unsupported cmd %d", cmd);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static void clock_remove(struct xrt_device *xdev)
+{
+ sysfs_remove_group(&xdev->dev.kobj, &clock_attr_group);
+}
+
+static int clock_probe(struct xrt_device *xdev)
+{
+ struct clock *clock = NULL;
+ void __iomem *base = NULL;
+ struct resource *res;
+ int ret;
+
+ clock = devm_kzalloc(&xdev->dev, sizeof(*clock), GFP_KERNEL);
+ if (!clock)
+ return -ENOMEM;
+
+ xrt_set_drvdata(xdev, clock);
+ clock->xdev = xdev;
+ mutex_init(&clock->clock_lock);
+
+ res = xrt_get_resource(xdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ ret = -EINVAL;
+ goto failed;
+ }
+
+ base = devm_ioremap_resource(&xdev->dev, res);
+ if (IS_ERR(base)) {
+ ret = PTR_ERR(base);
+ goto failed;
+ }
+
+ clock->regmap = devm_regmap_init_mmio(&xdev->dev, base, &clock_regmap_config);
+ if (IS_ERR(clock->regmap)) {
+ CLOCK_ERR(clock, "regmap %pR failed", res);
+ ret = PTR_ERR(clock->regmap);
+ goto failed;
+ }
+ clock->clock_ep_name = res->name;
+
+ ret = clock_init(clock);
+ if (ret)
+ goto failed;
+
+ ret = sysfs_create_group(&xdev->dev.kobj, &clock_attr_group);
+ if (ret) {
+ CLOCK_ERR(clock, "create clock attrs failed: %d", ret);
+ goto failed;
+ }
+
+ CLOCK_INFO(clock, "successfully initialized Clock subdev");
+
+ return 0;
+
+failed:
+ return ret;
+}
+
+static struct xrt_dev_endpoints xrt_clock_endpoints[] = {
+ {
+ .xse_names = (struct xrt_dev_ep_names[]) {
+ { .compat = "clkwiz" },
+ { NULL },
+ },
+ .xse_min_ep = 1,
+ },
+ { 0 },
+};
+
+static struct xrt_driver xrt_clock_driver = {
+ .driver = {
+ .name = XRT_CLOCK,
+ },
+ .subdev_id = XRT_SUBDEV_CLOCK,
+ .endpoints = xrt_clock_endpoints,
+ .probe = clock_probe,
+ .remove = clock_remove,
+ .leaf_call = xrt_clock_leaf_call,
+};
+
+XRT_LEAF_INIT_FINI_FUNC(clock);
--
2.27.0