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Subject[PATCH V3 XRT Alveo 12/18] fpga: xrt: ICAP platform driver
Date
Add ICAP driver. ICAP is a hardware function discovered by walking
firmware metadata. A platform device node will be created for it.
FPGA bitstream is written to hardware through ICAP.

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/icap.h | 29 +++
drivers/fpga/xrt/lib/xleaf/icap.c | 317 ++++++++++++++++++++++++++
2 files changed, 346 insertions(+)
create mode 100644 drivers/fpga/xrt/include/xleaf/icap.h
create mode 100644 drivers/fpga/xrt/lib/xleaf/icap.c

diff --git a/drivers/fpga/xrt/include/xleaf/icap.h b/drivers/fpga/xrt/include/xleaf/icap.h
new file mode 100644
index 000000000000..a14fc0ffa78f
--- /dev/null
+++ b/drivers/fpga/xrt/include/xleaf/icap.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Header file for XRT ICAP Leaf Driver
+ *
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Lizhi Hou <Lizhi.Hou@xilinx.com>
+ */
+
+#ifndef _XRT_ICAP_H_
+#define _XRT_ICAP_H_
+
+#include "xleaf.h"
+
+/*
+ * ICAP driver IOCTL calls.
+ */
+enum xrt_icap_ioctl_cmd {
+ XRT_ICAP_WRITE = XRT_XLEAF_CUSTOM_BASE, /* See comments in xleaf.h */
+ XRT_ICAP_IDCODE,
+};
+
+struct xrt_icap_ioctl_wr {
+ void *xiiw_bit_data;
+ u32 xiiw_data_len;
+};
+
+#endif /* _XRT_ICAP_H_ */
diff --git a/drivers/fpga/xrt/lib/xleaf/icap.c b/drivers/fpga/xrt/lib/xleaf/icap.c
new file mode 100644
index 000000000000..0500a97bdef9
--- /dev/null
+++ b/drivers/fpga/xrt/lib/xleaf/icap.c
@@ -0,0 +1,317 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Alveo FPGA ICAP Driver
+ *
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Lizhi Hou<Lizhi.Hou@xilinx.com>
+ * Sonal Santan <sonals@xilinx.com>
+ * Max Zhen <maxz@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/icap.h"
+#include "xclbin-helper.h"
+
+#define XRT_ICAP "xrt_icap"
+
+#define ICAP_ERR(icap, fmt, arg...) \
+ xrt_err((icap)->pdev, fmt "\n", ##arg)
+#define ICAP_WARN(icap, fmt, arg...) \
+ xrt_warn((icap)->pdev, fmt "\n", ##arg)
+#define ICAP_INFO(icap, fmt, arg...) \
+ xrt_info((icap)->pdev, fmt "\n", ##arg)
+#define ICAP_DBG(icap, fmt, arg...) \
+ xrt_dbg((icap)->pdev, fmt "\n", ##arg)
+
+/*
+ * AXI-HWICAP IP register layout
+ */
+struct icap_reg {
+ u32 ir_rsvd1[7];
+ u32 ir_gier;
+ u32 ir_isr;
+ u32 ir_rsvd2;
+ u32 ir_ier;
+ u32 ir_rsvd3[53];
+ u32 ir_wf;
+ u32 ir_rf;
+ u32 ir_sz;
+ u32 ir_cr;
+ u32 ir_sr;
+ u32 ir_wfv;
+ u32 ir_rfo;
+ u32 ir_asr;
+} __packed;
+
+struct icap {
+ struct platform_device *pdev;
+ struct icap_reg *icap_regs;
+ struct mutex icap_lock; /* icap dev lock */
+
+ unsigned int idcode;
+};
+
+static inline u32 reg_rd(void __iomem *reg)
+{
+ if (!reg)
+ return -1;
+
+ return ioread32(reg);
+}
+
+static inline void reg_wr(void __iomem *reg, u32 val)
+{
+ if (!reg)
+ return;
+
+ iowrite32(val, reg);
+}
+
+static int wait_for_done(struct icap *icap)
+{
+ u32 w;
+ int i = 0;
+
+ WARN_ON(!mutex_is_locked(&icap->icap_lock));
+ for (i = 0; i < 10; i++) {
+ udelay(5);
+ w = reg_rd(&icap->icap_regs->ir_sr);
+ ICAP_INFO(icap, "XHWICAP_SR: %x", w);
+ if (w & 0x5)
+ return 0;
+ }
+
+ ICAP_ERR(icap, "bitstream download timeout");
+ return -ETIMEDOUT;
+}
+
+static int icap_write(struct icap *icap, const u32 *word_buf, int size)
+{
+ int i;
+ u32 value = 0;
+
+ for (i = 0; i < size; i++) {
+ value = be32_to_cpu(word_buf[i]);
+ reg_wr(&icap->icap_regs->ir_wf, value);
+ }
+
+ reg_wr(&icap->icap_regs->ir_cr, 0x1);
+
+ for (i = 0; i < 20; i++) {
+ value = reg_rd(&icap->icap_regs->ir_cr);
+ if ((value & 0x1) == 0)
+ return 0;
+ ndelay(50);
+ }
+
+ ICAP_ERR(icap, "writing %d dwords timeout", size);
+ return -EIO;
+}
+
+static int bitstream_helper(struct icap *icap, const u32 *word_buffer,
+ u32 word_count)
+{
+ u32 remain_word;
+ u32 word_written = 0;
+ int wr_fifo_vacancy = 0;
+ int err = 0;
+
+ WARN_ON(!mutex_is_locked(&icap->icap_lock));
+ for (remain_word = word_count; remain_word > 0;
+ remain_word -= word_written, word_buffer += word_written) {
+ wr_fifo_vacancy = reg_rd(&icap->icap_regs->ir_wfv);
+ if (wr_fifo_vacancy <= 0) {
+ ICAP_ERR(icap, "no vacancy: %d", wr_fifo_vacancy);
+ err = -EIO;
+ break;
+ }
+ word_written = (wr_fifo_vacancy < remain_word) ?
+ wr_fifo_vacancy : remain_word;
+ if (icap_write(icap, word_buffer, word_written) != 0) {
+ ICAP_ERR(icap, "write failed remain %d, written %d",
+ remain_word, word_written);
+ err = -EIO;
+ break;
+ }
+ }
+
+ return err;
+}
+
+static int icap_download(struct icap *icap, const char *buffer,
+ unsigned long length)
+{
+ u32 num_chars_read = DMA_HWICAP_BITFILE_BUFFER_SIZE;
+ u32 byte_read;
+ int err = 0;
+
+ mutex_lock(&icap->icap_lock);
+ for (byte_read = 0; byte_read < length; byte_read += num_chars_read) {
+ num_chars_read = length - byte_read;
+ if (num_chars_read > DMA_HWICAP_BITFILE_BUFFER_SIZE)
+ num_chars_read = DMA_HWICAP_BITFILE_BUFFER_SIZE;
+
+ err = bitstream_helper(icap, (u32 *)buffer, num_chars_read / sizeof(u32));
+ if (err)
+ goto failed;
+ buffer += num_chars_read;
+ }
+
+ err = wait_for_done(icap);
+
+failed:
+ mutex_unlock(&icap->icap_lock);
+
+ return err;
+}
+
+/*
+ * Run the following sequence of canned commands to obtain IDCODE of the FPGA
+ */
+static void icap_probe_chip(struct icap *icap)
+{
+ u32 w;
+
+ w = reg_rd(&icap->icap_regs->ir_sr);
+ w = reg_rd(&icap->icap_regs->ir_sr);
+ reg_wr(&icap->icap_regs->ir_gier, 0x0);
+ w = reg_rd(&icap->icap_regs->ir_wfv);
+ reg_wr(&icap->icap_regs->ir_wf, 0xffffffff);
+ reg_wr(&icap->icap_regs->ir_wf, 0xaa995566);
+ reg_wr(&icap->icap_regs->ir_wf, 0x20000000);
+ reg_wr(&icap->icap_regs->ir_wf, 0x20000000);
+ reg_wr(&icap->icap_regs->ir_wf, 0x28018001);
+ reg_wr(&icap->icap_regs->ir_wf, 0x20000000);
+ reg_wr(&icap->icap_regs->ir_wf, 0x20000000);
+ w = reg_rd(&icap->icap_regs->ir_cr);
+ reg_wr(&icap->icap_regs->ir_cr, 0x1);
+ w = reg_rd(&icap->icap_regs->ir_cr);
+ w = reg_rd(&icap->icap_regs->ir_cr);
+ w = reg_rd(&icap->icap_regs->ir_sr);
+ w = reg_rd(&icap->icap_regs->ir_cr);
+ w = reg_rd(&icap->icap_regs->ir_sr);
+ reg_wr(&icap->icap_regs->ir_sz, 0x1);
+ w = reg_rd(&icap->icap_regs->ir_cr);
+ reg_wr(&icap->icap_regs->ir_cr, 0x2);
+ w = reg_rd(&icap->icap_regs->ir_rfo);
+ icap->idcode = reg_rd(&icap->icap_regs->ir_rf);
+ w = reg_rd(&icap->icap_regs->ir_cr);
+ (void)w;
+}
+
+static int
+xrt_icap_leaf_ioctl(struct platform_device *pdev, u32 cmd, void *arg)
+{
+ struct xrt_icap_ioctl_wr *wr_arg = arg;
+ struct icap *icap;
+ int ret = 0;
+
+ icap = platform_get_drvdata(pdev);
+
+ switch (cmd) {
+ case XRT_XLEAF_EVENT:
+ /* Does not handle any event. */
+ break;
+ case XRT_ICAP_WRITE:
+ ret = icap_download(icap, wr_arg->xiiw_bit_data,
+ wr_arg->xiiw_data_len);
+ break;
+ case XRT_ICAP_IDCODE:
+ *(u64 *)arg = icap->idcode;
+ break;
+ default:
+ ICAP_ERR(icap, "unknown command %d", cmd);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int xrt_icap_remove(struct platform_device *pdev)
+{
+ struct icap *icap;
+
+ icap = platform_get_drvdata(pdev);
+
+ platform_set_drvdata(pdev, NULL);
+ devm_kfree(&pdev->dev, icap);
+
+ return 0;
+}
+
+static int xrt_icap_probe(struct platform_device *pdev)
+{
+ struct icap *icap;
+ int ret = 0;
+ struct resource *res;
+
+ icap = devm_kzalloc(&pdev->dev, sizeof(*icap), GFP_KERNEL);
+ if (!icap)
+ return -ENOMEM;
+
+ icap->pdev = pdev;
+ platform_set_drvdata(pdev, icap);
+ mutex_init(&icap->icap_lock);
+
+ xrt_info(pdev, "probing");
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res) {
+ icap->icap_regs = ioremap(res->start, res->end - res->start + 1);
+ if (!icap->icap_regs) {
+ xrt_err(pdev, "map base failed %pR", res);
+ ret = -EIO;
+ goto failed;
+ }
+ }
+
+ icap_probe_chip(icap);
+failed:
+ return ret;
+}
+
+static struct xrt_subdev_endpoints xrt_icap_endpoints[] = {
+ {
+ .xse_names = (struct xrt_subdev_ep_names[]) {
+ { .ep_name = XRT_MD_NODE_FPGA_CONFIG },
+ { NULL },
+ },
+ .xse_min_ep = 1,
+ },
+ { 0 },
+};
+
+static struct xrt_subdev_drvdata xrt_icap_data = {
+ .xsd_dev_ops = {
+ .xsd_ioctl = xrt_icap_leaf_ioctl,
+ },
+};
+
+static const struct platform_device_id xrt_icap_table[] = {
+ { XRT_ICAP, (kernel_ulong_t)&xrt_icap_data },
+ { },
+};
+
+static struct platform_driver xrt_icap_driver = {
+ .driver = {
+ .name = XRT_ICAP,
+ },
+ .probe = xrt_icap_probe,
+ .remove = xrt_icap_remove,
+ .id_table = xrt_icap_table,
+};
+
+void icap_leaf_init_fini(bool init)
+{
+ if (init)
+ xleaf_register_driver(XRT_SUBDEV_ICAP, &xrt_icap_driver, xrt_icap_endpoints);
+ else
+ xleaf_unregister_driver(XRT_SUBDEV_ICAP);
+}
--
2.18.4
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