[PATCH V3 XRT Alveo 14/18] fpga: xrt: clock platform driver

Lizhi Hou
2021-02-18T07:19:34Z

Add clock driver. Clock is a hardware function discovered by walking
xclbin metadata. A platform 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 <lizhih@xilinx.com>
---
drivers/fpga/xrt/include/xleaf/clock.h | 31 ++
drivers/fpga/xrt/lib/xleaf/clock.c | 648 +++++++++++++++++++++++++
2 files changed, 679 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..a2da59b32551
--- /dev/null
+++ b/drivers/fpga/xrt/include/xleaf/clock.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Header file for XRT Clock Leaf Driver
+ *
+ * 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 IOCTL calls.
+ */
+enum xrt_clock_ioctl_cmd {
+ XRT_CLOCK_SET = XRT_XLEAF_CUSTOM_BASE, /* See comments in xleaf.h */
+ XRT_CLOCK_GET,
+ XRT_CLOCK_VERIFY,
+};
+
+struct xrt_clock_ioctl_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..a067b501a607
--- /dev/null
+++ b/drivers/fpga/xrt/lib/xleaf/clock.c
@@ -0,0 +1,648 @@
+// 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/platform_device.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include "metadata.h"
+#include "xleaf.h"
+#include "xleaf/clock.h"
+#include "xleaf/clkfreq.h"
+
+/* CLOCK_MAX_NUM_CLOCKS should be a concept from XCLBIN_ in the future */
+#define CLOCK_MAX_NUM_CLOCKS 4
+#define OCL_CLKWIZ_STATUS_OFFSET 0x4
+#define OCL_CLKWIZ_STATUS_MASK 0xffff
+#define OCL_CLKWIZ_STATUS_MEASURE_START 0x1
+#define OCL_CLKWIZ_STATUS_MEASURE_DONE 0x2
+#define OCL_CLKWIZ_CONFIG_OFFSET(n) (0x200 + 4 * (n))
+#define CLOCK_DEFAULT_EXPIRE_SECS 1
+
+#define CLOCK_ERR(clock, fmt, arg...) \
+ xrt_err((clock)->pdev, fmt "\n", ##arg)
+#define CLOCK_WARN(clock, fmt, arg...) \
+ xrt_warn((clock)->pdev, fmt "\n", ##arg)
+#define CLOCK_INFO(clock, fmt, arg...) \
+ xrt_info((clock)->pdev, fmt "\n", ##arg)
+#define CLOCK_DBG(clock, fmt, arg...) \
+ xrt_dbg((clock)->pdev, fmt "\n", ##arg)
+
+#define XRT_CLOCK "xrt_clock"
+
+struct clock {
+ struct platform_device *pdev;
+ void __iomem *clock_base;
+ 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 wiz.pl.
+ */
+static const struct xmgmt_ocl_clockwiz {
+ /* target frequency */
+ unsigned short ocl;
+ /* config0 register */
+ unsigned long config0;
+ /* config2 register */
+ unsigned int config2;
+} frequency_table[] = {
+ {/*1275.000*/ 10.000, 0x02EE0C01, 0x0001F47F},
+ {/*1575.000*/ 15.000, 0x02EE0F01, 0x00000069},
+ {/*1600.000*/ 20.000, 0x00001001, 0x00000050},
+ {/*1600.000*/ 25.000, 0x00001001, 0x00000040},
+ {/*1575.000*/ 30.000, 0x02EE0F01, 0x0001F434},
+ {/*1575.000*/ 35.000, 0x02EE0F01, 0x0000002D},
+ {/*1600.000*/ 40.000, 0x00001001, 0x00000028},
+ {/*1575.000*/ 45.000, 0x02EE0F01, 0x00000023},
+ {/*1600.000*/ 50.000, 0x00001001, 0x00000020},
+ {/*1512.500*/ 55.000, 0x007D0F01, 0x0001F41B},
+ {/*1575.000*/ 60.000, 0x02EE0F01, 0x0000FA1A},
+ {/*1462.500*/ 65.000, 0x02710E01, 0x0001F416},
+ {/*1575.000*/ 70.000, 0x02EE0F01, 0x0001F416},
+ {/*1575.000*/ 75.000, 0x02EE0F01, 0x00000015},
+ {/*1600.000*/ 80.000, 0x00001001, 0x00000014},
+ {/*1487.500*/ 85.000, 0x036B0E01, 0x0001F411},
+ {/*1575.000*/ 90.000, 0x02EE0F01, 0x0001F411},
+ {/*1425.000*/ 95.000, 0x00FA0E01, 0x0000000F},
+ {/*1600.000*/ 100.000, 0x00001001, 0x00000010},
+ {/*1575.000*/ 105.000, 0x02EE0F01, 0x0000000F},
+ {/*1512.500*/ 110.000, 0x007D0F01, 0x0002EE0D},
+ {/*1437.500*/ 115.000, 0x01770E01, 0x0001F40C},
+ {/*1575.000*/ 120.000, 0x02EE0F01, 0x00007D0D},
+ {/*1562.500*/ 125.000, 0x02710F01, 0x0001F40C},
+ {/*1462.500*/ 130.000, 0x02710E01, 0x0000FA0B},
+ {/*1350.000*/ 135.000, 0x01F40D01, 0x0000000A},
+ {/*1575.000*/ 140.000, 0x02EE0F01, 0x0000FA0B},
+ {/*1450.000*/ 145.000, 0x01F40E01, 0x0000000A},
+ {/*1575.000*/ 150.000, 0x02EE0F01, 0x0001F40A},
+ {/*1550.000*/ 155.000, 0x01F40F01, 0x0000000A},
+ {/*1600.000*/ 160.000, 0x00001001, 0x0000000A},
+ {/*1237.500*/ 165.000, 0x01770C01, 0x0001F407},
+ {/*1487.500*/ 170.000, 0x036B0E01, 0x0002EE08},
+ {/*1575.000*/ 175.000, 0x02EE0F01, 0x00000009},
+ {/*1575.000*/ 180.000, 0x02EE0F01, 0x0002EE08},
+ {/*1387.500*/ 185.000, 0x036B0D01, 0x0001F407},
+ {/*1425.000*/ 190.000, 0x00FA0E01, 0x0001F407},
+ {/*1462.500*/ 195.000, 0x02710E01, 0x0001F407},
+ {/*1600.000*/ 200.000, 0x00001001, 0x00000008},
+ {/*1537.500*/ 205.000, 0x01770F01, 0x0001F407},
+ {/*1575.000*/ 210.000, 0x02EE0F01, 0x0001F407},
+ {/*1075.000*/ 215.000, 0x02EE0A01, 0x00000005},
+ {/*1512.500*/ 220.000, 0x007D0F01, 0x00036B06},
+ {/*1575.000*/ 225.000, 0x02EE0F01, 0x00000007},
+ {/*1437.500*/ 230.000, 0x01770E01, 0x0000FA06},
+ {/*1175.000*/ 235.000, 0x02EE0B01, 0x00000005},
+ {/*1500.000*/ 240.000, 0x00000F01, 0x0000FA06},
+ {/*1225.000*/ 245.000, 0x00FA0C01, 0x00000005},
+ {/*1562.500*/ 250.000, 0x02710F01, 0x0000FA06},
+ {/*1275.000*/ 255.000, 0x02EE0C01, 0x00000005},
+ {/*1462.500*/ 260.000, 0x02710E01, 0x00027105},
+ {/*1325.000*/ 265.000, 0x00FA0D01, 0x00000005},
+ {/*1350.000*/ 270.000, 0x01F40D01, 0x00000005},
+ {/*1512.500*/ 275.000, 0x007D0F01, 0x0001F405},
+ {/*1575.000*/ 280.000, 0x02EE0F01, 0x00027105},
+ {/*1425.000*/ 285.000, 0x00FA0E01, 0x00000005},
+ {/*1450.000*/ 290.000, 0x01F40E01, 0x00000005},
+ {/*1475.000*/ 295.000, 0x02EE0E01, 0x00000005},
+ {/*1575.000*/ 300.000, 0x02EE0F01, 0x0000FA05},
+ {/*1525.000*/ 305.000, 0x00FA0F01, 0x00000005},
+ {/*1550.000*/ 310.000, 0x01F40F01, 0x00000005},
+ {/*1575.000*/ 315.000, 0x02EE0F01, 0x00000005},
+ {/*1600.000*/ 320.000, 0x00001001, 0x00000005},
+ {/*1462.500*/ 325.000, 0x02710E01, 0x0001F404},
+ {/*1237.500*/ 330.000, 0x01770C01, 0x0002EE03},
+ {/*837.500*/ 335.000, 0x01770801, 0x0001F402},
+ {/*1487.500*/ 340.000, 0x036B0E01, 0x00017704},
+ {/*862.500*/ 345.000, 0x02710801, 0x0001F402},
+ {/*1575.000*/ 350.000, 0x02EE0F01, 0x0001F404},
+ {/*887.500*/ 355.000, 0x036B0801, 0x0001F402},
+ {/*1575.000*/ 360.000, 0x02EE0F01, 0x00017704},
+ {/*912.500*/ 365.000, 0x007D0901, 0x0001F402},
+ {/*1387.500*/ 370.000, 0x036B0D01, 0x0002EE03},
+ {/*1500.000*/ 375.000, 0x00000F01, 0x00000004},
+ {/*1425.000*/ 380.000, 0x00FA0E01, 0x0002EE03},
+ {/*962.500*/ 385.000, 0x02710901, 0x0001F402},
+ {/*1462.500*/ 390.000, 0x02710E01, 0x0002EE03},
+ {/*987.500*/ 395.000, 0x036B0901, 0x0001F402},
+ {/*1600.000*/ 400.000, 0x00001001, 0x00000004},
+ {/*1012.500*/ 405.000, 0x007D0A01, 0x0001F402},
+ {/*1537.500*/ 410.000, 0x01770F01, 0x0002EE03},
+ {/*1037.500*/ 415.000, 0x01770A01, 0x0001F402},
+ {/*1575.000*/ 420.000, 0x02EE0F01, 0x0002EE03},
+ {/*1487.500*/ 425.000, 0x036B0E01, 0x0001F403},
+ {/*1075.000*/ 430.000, 0x02EE0A01, 0x0001F402},
+ {/*1087.500*/ 435.000, 0x036B0A01, 0x0001F402},
+ {/*1375.000*/ 440.000, 0x02EE0D01, 0x00007D03},
+ {/*1112.500*/ 445.000, 0x007D0B01, 0x0001F402},
+ {/*1575.000*/ 450.000, 0x02EE0F01, 0x0001F403},
+ {/*1137.500*/ 455.000, 0x01770B01, 0x0001F402},
+ {/*1437.500*/ 460.000, 0x01770E01, 0x00007D03},
+ {/*1162.500*/ 465.000, 0x02710B01, 0x0001F402},
+ {/*1175.000*/ 470.000, 0x02EE0B01, 0x0001F402},
+ {/*1425.000*/ 475.000, 0x00FA0E01, 0x00000003},
+ {/*1500.000*/ 480.000, 0x00000F01, 0x00007D03},
+ {/*1212.500*/ 485.000, 0x007D0C01, 0x0001F402},
+ {/*1225.000*/ 490.000, 0x00FA0C01, 0x0001F402},
+ {/*1237.500*/ 495.000, 0x01770C01, 0x0001F402},
+ {/*1562.500*/ 500.000, 0x02710F01, 0x00007D03},
+ {/*1262.500*/ 505.000, 0x02710C01, 0x0001F402},
+ {/*1275.000*/ 510.000, 0x02EE0C01, 0x0001F402},
+ {/*1287.500*/ 515.000, 0x036B0C01, 0x0001F402},
+ {/*1300.000*/ 520.000, 0x00000D01, 0x0001F402},
+ {/*1575.000*/ 525.000, 0x02EE0F01, 0x00000003},
+ {/*1325.000*/ 530.000, 0x00FA0D01, 0x0001F402},
+ {/*1337.500*/ 535.000, 0x01770D01, 0x0001F402},
+ {/*1350.000*/ 540.000, 0x01F40D01, 0x0001F402},
+ {/*1362.500*/ 545.000, 0x02710D01, 0x0001F402},
+ {/*1512.500*/ 550.000, 0x007D0F01, 0x0002EE02},
+ {/*1387.500*/ 555.000, 0x036B0D01, 0x0001F402},
+ {/*1400.000*/ 560.000, 0x00000E01, 0x0001F402},
+ {/*1412.500*/ 565.000, 0x007D0E01, 0x0001F402},
+ {/*1425.000*/ 570.000, 0x00FA0E01, 0x0001F402},
+ {/*1437.500*/ 575.000, 0x01770E01, 0x0001F402},
+ {/*1450.000*/ 580.000, 0x01F40E01, 0x0001F402},
+ {/*1462.500*/ 585.000, 0x02710E01, 0x0001F402},
+ {/*1475.000*/ 590.000, 0x02EE0E01, 0x0001F402},
+ {/*1487.500*/ 595.000, 0x036B0E01, 0x0001F402},
+ {/*1575.000*/ 600.000, 0x02EE0F01, 0x00027102},
+ {/*1512.500*/ 605.000, 0x007D0F01, 0x0001F402},
+ {/*1525.000*/ 610.000, 0x00FA0F01, 0x0001F402},
+ {/*1537.500*/ 615.000, 0x01770F01, 0x0001F402},
+ {/*1550.000*/ 620.000, 0x01F40F01, 0x0001F402},
+ {/*1562.500*/ 625.000, 0x02710F01, 0x0001F402},
+ {/*1575.000*/ 630.000, 0x02EE0F01, 0x0001F402},
+ {/*1587.500*/ 635.000, 0x036B0F01, 0x0001F402},
+ {/*1600.000*/ 640.000, 0x00001001, 0x0001F402},
+ {/*1290.000*/ 645.000, 0x01F44005, 0x00000002},
+ {/*1462.500*/ 650.000, 0x02710E01, 0x0000FA02}
+};
+
+static inline u32 reg_rd(struct clock *clock, u32 offset)
+{
+ return ioread32(clock->clock_base + offset);
+}
+
+static inline void reg_wr(struct clock *clock, u32 val, u32 offset)
+{
+ iowrite32(val, clock->clock_base + offset);
+}
+
+static u32 find_matching_freq_config(unsigned short freq,
+ const struct xmgmt_ocl_clockwiz *table,
+ int size)
+{
+ u32 start = 0;
+ u32 end = size - 1;
+ u32 idx = size - 1;
+
+ if (freq < table[0].ocl)
+ return 0;
+
+ if (freq > table[size - 1].ocl)
+ return size - 1;
+
+ while (start < end) {
+ if (freq == table[idx].ocl)
+ break;
+ if (freq < table[idx].ocl)
+ end = idx;
+ else
+ start = idx + 1;
+ idx = start + (end - start) / 2;
+ }
+ if (freq < table[idx].ocl)
+ idx--;
+
+ return idx;
+}
+
+static u32 find_matching_freq(u32 freq,
+ const struct xmgmt_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;
+
+ val = reg_rd(clock, OCL_CLKWIZ_STATUS_OFFSET);
+ for (count = 0; val != 1 && count < cycle; count++) {
+ mdelay(interval);
+ val = reg_rd(clock, OCL_CLKWIZ_STATUS_OFFSET);
+ }
+ if (val != 1) {
+ CLOCK_ERR(clock, "clockwiz is (%u) busy after %d ms",
+ val, cycle * interval);
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int get_freq(struct clock *clock, u16 *freq)
+{
+#define XCL_INPUT_FREQ 100
+ const u64 input = XCL_INPUT_FREQ;
+ u32 val;
+ u32 mul0, div0;
+ u32 mul_frac0 = 0;
+ u32 div1;
+ u32 div_frac1 = 0;
+
+ WARN_ON(!mutex_is_locked(&clock->clock_lock));
+
+ val = reg_rd(clock, OCL_CLKWIZ_STATUS_OFFSET);
+ if ((val & 0x1) == 0) {
+ CLOCK_ERR(clock, "clockwiz is busy %x", val);
+ *freq = 0;
+ return -EBUSY;
+ }
+
+ val = reg_rd(clock, OCL_CLKWIZ_CONFIG_OFFSET(0));
+
+ 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;
+
+ val = reg_rd(clock, OCL_CLKWIZ_CONFIG_OFFSET(2));
+
+ 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;
+ }
+
+ *freq = (u16)((input * mul0) / div0);
+
+ return 0;
+}
+
+static int set_freq(struct clock *clock, u16 freq)
+{
+ u32 config;
+ int err;
+ u32 idx = 0;
+ u32 val;
+
+ WARN_ON(!mutex_is_locked(&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)
+ return -EBUSY;
+
+ config = frequency_table[idx].config0;
+ reg_wr(clock, config, OCL_CLKWIZ_CONFIG_OFFSET(0));
+
+ config = frequency_table[idx].config2;
+ reg_wr(clock, config, OCL_CLKWIZ_CONFIG_OFFSET(2));
+
+ mdelay(10);
+ reg_wr(clock, 7, OCL_CLKWIZ_CONFIG_OFFSET(23));
+
+ mdelay(1);
+ reg_wr(clock, 2, OCL_CLKWIZ_CONFIG_OFFSET(23));
+
+ 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 */
+ reg_wr(clock, 4, OCL_CLKWIZ_CONFIG_OFFSET(23));
+ mdelay(10);
+ reg_wr(clock, 0, OCL_CLKWIZ_CONFIG_OFFSET(23));
+ return err;
+ }
+ val = reg_rd(clock, OCL_CLKWIZ_CONFIG_OFFSET(0));
+ CLOCK_INFO(clock, "clockwiz CONFIG(0) 0x%x", val);
+ val = reg_rd(clock, OCL_CLKWIZ_CONFIG_OFFSET(2));
+ CLOCK_INFO(clock, "clockwiz CONFIG(2) 0x%x", val);
+
+ return 0;
+}
+
+static int get_freq_counter(struct clock *clock, u32 *freq)
+{
+ const void *cnter;
+ struct platform_device *cnter_leaf;
+ struct platform_device *pdev = clock->pdev;
+ struct xrt_subdev_platdata *pdata = DEV_PDATA(clock->pdev);
+ int err = xrt_md_get_prop(DEV(pdev), pdata->xsp_dtb,
+ clock->clock_ep_name, NULL, XRT_MD_PROP_CLK_CNT, &cnter, NULL);
+
+ WARN_ON(!mutex_is_locked(&clock->clock_lock));
+
+ if (err) {
+ xrt_err(pdev, "no counter specified");
+ return err;
+ }
+
+ cnter_leaf = xleaf_get_leaf_by_epname(pdev, cnter);
+ if (!cnter_leaf) {
+ xrt_err(pdev, "can't find counter");
+ return -ENOENT;
+ }
+
+ err = xleaf_ioctl(cnter_leaf, XRT_CLKFREQ_READ, freq);
+ if (err)
+ xrt_err(pdev, "can't read counter");
+ xleaf_put_leaf(clock->pdev, cnter_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_set_freq(struct clock *clock, u16 freq)
+{
+ int err;
+
+ mutex_lock(&clock->clock_lock);
+ err = set_freq(clock, freq);
+ mutex_unlock(&clock->clock_lock);
+
+ return err;
+}
+
+static int clock_verify_freq(struct clock *clock)
+{
+ int err = 0;
+ u16 freq;
+ u32 lookup_freq, clock_freq_counter, request_in_khz, tolerance;
+
+ mutex_lock(&clock->clock_lock);
+
+ err = get_freq(clock, &freq);
+ if (err) {
+ xrt_err(clock->pdev, "get freq failed, %d", err);
+ goto end;
+ }
+
+ err = get_freq_counter(clock, &clock_freq_counter);
+ if (err) {
+ xrt_err(clock->pdev, "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->pdev);
+ int err = 0;
+ const u16 *freq;
+
+ err = xrt_md_get_prop(DEV(clock->pdev), pdata->xsp_dtb,
+ clock->clock_ep_name, NULL, XRT_MD_PROP_CLK_FREQ,
+ (const void **)&freq, NULL);
+ if (err) {
+ xrt_info(clock->pdev, "no default freq");
+ return 0;
+ }
+
+ mutex_lock(&clock->clock_lock);
+ err = set_freq(clock, be16_to_cpu(*freq));
+ mutex_unlock(&clock->clock_lock);
+
+ return err;
+}
+
+static ssize_t freq_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct clock *clock = platform_get_drvdata(to_platform_device(dev));
+ u16 freq = 0;
+ ssize_t count;
+
+ count = clock_get_freq(clock, &freq, NULL);
+ if (count < 0)
+ return count;
+
+ count = snprintf(buf, 64, "%d\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_ioctl(struct platform_device *pdev, u32 cmd, void *arg)
+{
+ struct clock *clock;
+ int ret = 0;
+
+ clock = platform_get_drvdata(pdev);
+
+ switch (cmd) {
+ case XRT_XLEAF_EVENT:
+ /* Does not handle any event. */
+ break;
+ case XRT_CLOCK_SET: {
+ u16 freq = (u16)(uintptr_t)arg;
+
+ ret = clock_set_freq(clock, freq);
+ break;
+ }
+ case XRT_CLOCK_VERIFY: {
+ ret = clock_verify_freq(clock);
+ break;
+ }
+ case XRT_CLOCK_GET: {
+ struct xrt_clock_ioctl_get *get =
+ (struct xrt_clock_ioctl_get *)arg;
+
+ ret = clock_get_freq(clock, &get->freq, &get->freq_cnter);
+ break;
+ }
+ default:
+ xrt_err(pdev, "unsupported cmd %d", cmd);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int clock_remove(struct platform_device *pdev)
+{
+ struct clock *clock;
+
+ clock = platform_get_drvdata(pdev);
+ if (!clock) {
+ xrt_err(pdev, "driver data is NULL");
+ return -EINVAL;
+ }
+
+ platform_set_drvdata(pdev, NULL);
+ devm_kfree(&pdev->dev, clock);
+
+ CLOCK_INFO(clock, "successfully removed Clock subdev");
+ return 0;
+}
+
+static int clock_probe(struct platform_device *pdev)
+{
+ struct clock *clock = NULL;
+ struct resource *res;
+ int ret;
+
+ clock = devm_kzalloc(&pdev->dev, sizeof(*clock), GFP_KERNEL);
+ if (!clock)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, clock);
+ clock->pdev = pdev;
+ mutex_init(&clock->clock_lock);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ clock->clock_base = ioremap(res->start, res->end - res->start + 1);
+ if (!clock->clock_base) {
+ CLOCK_ERR(clock, "map base %pR failed", res);
+ ret = -EFAULT;
+ goto failed;
+ }
+
+ clock->clock_ep_name = res->name;
+
+ ret = clock_init(clock);
+ if (ret)
+ goto failed;
+
+ ret = sysfs_create_group(&pdev->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:
+ clock_remove(pdev);
+ return ret;
+}
+
+static struct xrt_subdev_endpoints xrt_clock_endpoints[] = {
+ {
+ .xse_names = (struct xrt_subdev_ep_names[]) {
+ { .regmap_name = "clkwiz" },
+ { NULL },
+ },
+ .xse_min_ep = 1,
+ },
+ { 0 },
+};
+
+static struct xrt_subdev_drvdata xrt_clock_data = {
+ .xsd_dev_ops = {
+ .xsd_ioctl = xrt_clock_leaf_ioctl,
+ },
+};
+
+static const struct platform_device_id xrt_clock_table[] = {
+ { XRT_CLOCK, (kernel_ulong_t)&xrt_clock_data },
+ { },
+};
+
+static struct platform_driver xrt_clock_driver = {
+ .driver = {
+ .name = XRT_CLOCK,
+ },
+ .probe = clock_probe,
+ .remove = clock_remove,
+ .id_table = xrt_clock_table,
+};
+
+void clock_leaf_init_fini(bool init)
+{
+ if (init)
+ xleaf_register_driver(XRT_SUBDEV_CLOCK, &xrt_clock_driver, xrt_clock_endpoints);
+ else
+ xleaf_unregister_driver(XRT_SUBDEV_CLOCK);
+}
--
2.18.4