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Subject[PATCH v3 2/2] fpga: zynq-fpga: Add support for readback
Date
This patch does the below
--> Adds support for readback of pl configuration data
--> Adds support for readback of pl configuration registers

Usage:
Readback of PL configuration registers
cat /sys/kernel/debug/fpga/fpga0/image
Readback of PL configuration data
echo 1 > /sys/module/zynqmp_fpga/parameters/readback_type
cat /sys/kernel/debug/fpga/fpga0/image

Signed-off-by: Appana Durga Kedareswara rao <appana.durga.rao@xilinx.com>
---
Changes for v3:
--> Added support for pl configuration data readback
--> Improved the pl configuration register readback logic.
Changes for v2:
--> Removed locks from the read_ops as lock handling is done in the framework.

drivers/fpga/zynq-fpga.c | 400 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 400 insertions(+)

diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c
index 70b15b3..5f1a1aa 100644
--- a/drivers/fpga/zynq-fpga.c
+++ b/drivers/fpga/zynq-fpga.c
@@ -31,6 +31,7 @@
#include <linux/regmap.h>
#include <linux/string.h>
#include <linux/scatterlist.h>
+#include <linux/seq_file.h>

/* Offsets into SLCR regmap */

@@ -127,6 +128,72 @@
/* Disable global resets */
#define FPGA_RST_NONE_MASK 0x0

+static bool readback_type;
+module_param(readback_type, bool, 0644);
+MODULE_PARM_DESC(readback_type,
+ "readback_type 0-configuration register read "
+ "1- configuration data read (default: 0)");
+
+/**
+ * struct zynq_configreg - Configuration register offsets
+ * @reg: Name of the configuration register.
+ * @offset: Register offset.
+ */
+struct zynq_configreg {
+ char *reg;
+ u32 offset;
+};
+
+static struct zynq_configreg cfgreg[] = {
+ {.reg = "CRC", .offset = 0},
+ {.reg = "FAR", .offset = 1},
+ {.reg = "FDRI", .offset = 2},
+ {.reg = "FDRO", .offset = 3},
+ {.reg = "CMD", .offset = 4},
+ {.reg = "CTRL0", .offset = 5},
+ {.reg = "MASK", .offset = 6},
+ {.reg = "STAT", .offset = 7},
+ {.reg = "LOUT", .offset = 8},
+ {.reg = "COR0", .offset = 9},
+ {.reg = "MFWR", .offset = 10},
+ {.reg = "CBC", .offset = 11},
+ {.reg = "IDCODE", .offset = 12},
+ {.reg = "AXSS", .offset = 13},
+ {.reg = "COR1", .offset = 14},
+ {.reg = "WBSTR", .offset = 16},
+ {.reg = "TIMER", .offset = 17},
+ {.reg = "BOOTSTS", .offset = 22},
+ {.reg = "CTRL1", .offset = 24},
+ {}
+};
+
+/* Masks for Configuration registers */
+#define FAR_ADDR_MASK 0x00000000
+#define RCFG_CMD_MASK 0x00000004
+#define START_CMD_MASK 0x00000005
+#define RCRC_CMD_MASK 0x00000007
+#define SHUTDOWN_CMD_MASK 0x0000000B
+#define DESYNC_WORD_MASK 0x0000000D
+#define BUSWIDTH_SYNCWORD_MASK 0x000000BB
+#define NOOP_WORD_MASK 0x20000000
+#define BUSWIDTH_DETECT_MASK 0x11220044
+#define SYNC_WORD_MASK 0xAA995566
+#define DUMMY_WORD_MASK 0xFFFFFFFF
+
+#define TYPE_HDR_SHIFT 29
+#define TYPE_REG_SHIFT 13
+#define TYPE_OP_SHIFT 27
+#define TYPE_OPCODE_NOOP 0
+#define TYPE_OPCODE_READ 1
+#define TYPE_OPCODE_WRITE 2
+#define TYPE_FAR_OFFSET 1
+#define TYPE_FDRO_OFFSET 3
+#define TYPE_CMD_OFFSET 4
+
+#define READ_DMA_SIZE 0x200
+#define DUMMY_FRAMES_SIZE 0x28
+#define SLCR_PCAP_FREQ 10000000
+
struct zynq_fpga_priv {
int irq;
struct clk *clk;
@@ -140,6 +207,7 @@ struct zynq_fpga_priv {
struct scatterlist *cur_sg;

struct completion dma_done;
+ u32 size;
};

static inline void zynq_fpga_write(struct zynq_fpga_priv *priv, u32 offset,
@@ -164,6 +232,27 @@ static inline void zynq_fpga_set_irq(struct zynq_fpga_priv *priv, u32 enable)
zynq_fpga_write(priv, INT_MASK_OFFSET, ~enable);
}

+static void zynq_fpga_dma_xfer(struct zynq_fpga_priv *priv, u32 srcaddr,
+ u32 srclen, u32 dstaddr, u32 dstlen)
+{
+ zynq_fpga_write(priv, DMA_SRC_ADDR_OFFSET, srcaddr);
+ zynq_fpga_write(priv, DMA_DST_ADDR_OFFSET, dstaddr);
+ zynq_fpga_write(priv, DMA_SRC_LEN_OFFSET, srclen);
+ zynq_fpga_write(priv, DMA_DEST_LEN_OFFSET, dstlen);
+}
+
+static int zynq_fpga_wait_fordone(struct zynq_fpga_priv *priv)
+{
+ u32 status;
+ int ret;
+
+ ret = zynq_fpga_poll_timeout(priv, INT_STS_OFFSET, status,
+ status & IXR_D_P_DONE_MASK,
+ INIT_POLL_DELAY,
+ INIT_POLL_TIMEOUT);
+ return ret;
+}
+
/* Must be called with dma_lock held */
static void zynq_step_dma(struct zynq_fpga_priv *priv)
{
@@ -192,6 +281,7 @@ static void zynq_step_dma(struct zynq_fpga_priv *priv)
priv->dma_elm++;
}

+ priv->size += len;
zynq_fpga_write(priv, DMA_SRC_ADDR_OFFSET, addr);
zynq_fpga_write(priv, DMA_DST_ADDR_OFFSET, DMA_INVALID_ADDRESS);
zynq_fpga_write(priv, DMA_SRC_LEN_OFFSET, len / 4);
@@ -401,6 +491,7 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt)
int i;

priv = mgr->priv;
+ priv->size = 0;

/* The hardware can only DMA multiples of 4 bytes, and it requires the
* starting addresses to be aligned to 64 bits (UG585 pg 212).
@@ -546,12 +637,321 @@ static enum fpga_mgr_states zynq_fpga_ops_state(struct fpga_manager *mgr)
return FPGA_MGR_STATE_UNKNOWN;
}

+static int zynq_type1_pkt(u8 reg, u8 opcode, u16 size)
+{
+ /*
+ * Type 1 Packet Header Format
+ * The header section is always a 32-bit word.
+ *
+ * HeaderType | Opcode | Register Address | Reserved | Word Count
+ * [31:29] [28:27] [26:13] [12:11] [10:0]
+ * --------------------------------------------------------------
+ * 001 xx RRRRRRRRRxxxxx RR xxxxxxxxxxx
+ *
+ * @R: means the bit is not used and reserved for future use.
+ * The reserved bits should be written as 0s.
+ *
+ * Generating the Type 1 packet header which involves sifting of Type1
+ * Header Mask, Register value and the OpCode which is 01 in this case
+ * as only read operation is to be carried out and then performing OR
+ * operation with the Word Length.
+ */
+ return (((1 << TYPE_HDR_SHIFT) |
+ (reg << TYPE_REG_SHIFT) |
+ (opcode << TYPE_OP_SHIFT)) | size);
+
+}
+
+/****************************************************************************/
+/**
+ *
+ * Generates a Type 2 packet header that reads back the requested Configuration
+ * register.
+ *
+ * @param OpCode is the read/write operation code.
+ * @param Size is the size of the word to be read.
+ *
+ * @return Type 2 packet header to read the specified register
+ *
+ * @note None.
+ *
+ *****************************************************************************/
+static int zynq_type2_pkt(u8 OpCode, u32 Size)
+{
+ /*
+ * Type 2 Packet Header Format
+ * The header section is always a 32-bit word.
+ *
+ * HeaderType | Opcode | Word Count
+ * [31:29] [28:27] [26:0]
+ * --------------------------------------------------------------
+ * 010 xx xxxxxxxxxxxxx
+ *
+ * @R: means the bit is not used and reserved for future use.
+ * The reserved bits should be written as 0s.
+ *
+ * Generating the Type 2 packet header which involves sifting of Type 2
+ * Header Mask, OpCode and then performing OR
+ * operation with the Word Length.
+ */
+ return (((2 << TYPE_HDR_SHIFT) |
+ (OpCode << TYPE_OP_SHIFT)) | Size);
+}
+
+static int zynq_fpga_read_cfgdata(struct fpga_manager *mgr,
+ struct seq_file *s)
+{
+ struct zynq_fpga_priv *priv;
+ int ret = 0, i, cmdindex, clk_rate;
+ unsigned int *buf;
+ dma_addr_t dma_addr;
+ u32 intr_status, status;
+ size_t size;
+
+ priv = mgr->priv;
+ size = priv->size + READ_DMA_SIZE + DUMMY_FRAMES_SIZE;
+ buf = dma_zalloc_coherent(mgr->dev.parent, size,
+ &dma_addr, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ seq_puts(s, "zynq FPGA Configuration data contents are\n");
+
+ /*
+ * There is no h/w flow control for pcap read
+ * to prevent the FIFO from over flowing, reduce
+ * the PCAP operating frequency.
+ */
+ clk_rate = clk_get_rate(priv->clk);
+ ret = clk_set_rate(priv->clk, SLCR_PCAP_FREQ);
+ if (ret) {
+ dev_err(&mgr->dev, "Unable to reduce the PCAP freq\n");
+ goto free_dmabuf;
+ }
+
+ ret = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status,
+ status & STATUS_PCFG_INIT_MASK,
+ INIT_POLL_DELAY,
+ INIT_POLL_TIMEOUT);
+ if (ret) {
+ dev_err(&mgr->dev, "Timeout waiting for PCFG_INIT\n");
+ goto restore_pcap_clk;
+ }
+
+ cmdindex = 0;
+ buf[cmdindex++] = DUMMY_WORD_MASK;
+ buf[cmdindex++] = BUSWIDTH_SYNCWORD_MASK;
+ buf[cmdindex++] = BUSWIDTH_DETECT_MASK;
+ buf[cmdindex++] = DUMMY_WORD_MASK;
+ buf[cmdindex++] = SYNC_WORD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = zynq_type1_pkt(TYPE_CMD_OFFSET, TYPE_OPCODE_WRITE,
+ 1);
+ buf[cmdindex++] = SHUTDOWN_CMD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = zynq_type1_pkt(TYPE_CMD_OFFSET, TYPE_OPCODE_WRITE,
+ 1);
+ buf[cmdindex++] = RCRC_CMD_MASK;
+ for (i = 0; i < 6; i++)
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = zynq_type1_pkt(TYPE_CMD_OFFSET, TYPE_OPCODE_WRITE,
+ 1);
+ buf[cmdindex++] = RCFG_CMD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = zynq_type1_pkt(TYPE_FAR_OFFSET, TYPE_OPCODE_WRITE,
+ 1);
+ buf[cmdindex++] = FAR_ADDR_MASK;
+ buf[cmdindex++] = zynq_type1_pkt(TYPE_FDRO_OFFSET, TYPE_OPCODE_READ,
+ 0);
+ buf[cmdindex++] = zynq_type2_pkt(TYPE_OPCODE_READ, priv->size/4);
+ for (i = 0; i < 32; i++)
+ buf[cmdindex++] = NOOP_WORD_MASK;
+
+ intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
+ zynq_fpga_write(priv, INT_STS_OFFSET, intr_status);
+
+ /* Write to PCAP */
+ zynq_fpga_dma_xfer(priv, dma_addr, cmdindex,
+ DMA_INVALID_ADDRESS, 0);
+ ret = zynq_fpga_wait_fordone(priv);
+ if (ret) {
+ dev_err(&mgr->dev, "SRCDMA: Timeout waiting for D_P_DONE\n");
+ goto restore_pcap_clk;
+ }
+ intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
+ zynq_fpga_write(priv, INT_STS_OFFSET, intr_status);
+
+ /* READ From PACP */
+ zynq_fpga_dma_xfer(priv, DMA_INVALID_ADDRESS, 0,
+ dma_addr + READ_DMA_SIZE, priv->size/4);
+ ret = zynq_fpga_wait_fordone(priv);
+ if (ret) {
+ dev_err(&mgr->dev, "DSTDMA: Timeout waiting for D_P_DONE\n");
+ goto restore_pcap_clk;
+ }
+ intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
+ zynq_fpga_write(priv, INT_STS_OFFSET, intr_status);
+
+ /* Write to PCAP */
+ cmdindex = 0;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = zynq_type1_pkt(TYPE_CMD_OFFSET,
+ TYPE_OPCODE_WRITE, 1);
+ buf[cmdindex++] = START_CMD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+
+ buf[cmdindex++] = zynq_type1_pkt(TYPE_CMD_OFFSET,
+ TYPE_OPCODE_WRITE, 1);
+ buf[cmdindex++] = RCRC_CMD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = zynq_type1_pkt(TYPE_CMD_OFFSET,
+ TYPE_OPCODE_WRITE, 1);
+ buf[cmdindex++] = DESYNC_WORD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+
+ zynq_fpga_dma_xfer(priv, dma_addr, cmdindex,
+ DMA_INVALID_ADDRESS, 0);
+ ret = zynq_fpga_wait_fordone(priv);
+ if (ret) {
+ dev_err(&mgr->dev, "SRCDMA1: Timeout waiting for D_P_DONE\n");
+ goto restore_pcap_clk;
+ }
+
+ seq_write(s, &buf[READ_DMA_SIZE/4], priv->size);
+
+restore_pcap_clk:
+ clk_set_rate(priv->clk, clk_rate);
+free_dmabuf:
+ dma_free_coherent(mgr->dev.parent, size, buf,
+ dma_addr);
+ return ret;
+}
+
+static int zynq_fpga_getconfigreg(struct fpga_manager *mgr, u8 reg,
+ dma_addr_t dma_addr, int *buf)
+{
+ struct zynq_fpga_priv *priv;
+ int ret = 0, cmdindex, src_dmaoffset;
+ u32 intr_status, status;
+
+ priv = mgr->priv;
+
+ src_dmaoffset = 0x8;
+ cmdindex = 2;
+ buf[cmdindex++] = DUMMY_WORD_MASK;
+ buf[cmdindex++] = BUSWIDTH_SYNCWORD_MASK;
+ buf[cmdindex++] = BUSWIDTH_DETECT_MASK;
+ buf[cmdindex++] = DUMMY_WORD_MASK;
+ buf[cmdindex++] = SYNC_WORD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = zynq_type1_pkt(reg, TYPE_OPCODE_READ, 1);
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+
+ ret = zynq_fpga_poll_timeout(priv, STATUS_OFFSET, status,
+ status & STATUS_PCFG_INIT_MASK,
+ INIT_POLL_DELAY,
+ INIT_POLL_TIMEOUT);
+ if (ret) {
+ dev_err(&mgr->dev, "Timeout waiting for PCFG_INIT\n");
+ goto out;
+ }
+
+ /* Write to PCAP */
+ intr_status = zynq_fpga_read(priv, INT_STS_OFFSET);
+ zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK);
+
+ zynq_fpga_dma_xfer(priv, dma_addr + src_dmaoffset, cmdindex,
+ DMA_INVALID_ADDRESS, 0);
+ ret = zynq_fpga_wait_fordone(priv);
+ if (ret) {
+ dev_err(&mgr->dev, "SRCDMA: Timeout waiting for D_P_DONE\n");
+ goto out;
+ }
+ zynq_fpga_set_irq(priv, intr_status);
+
+ /* READ From PACP */
+ zynq_fpga_dma_xfer(priv, DMA_INVALID_ADDRESS, 0, dma_addr, 1);
+ ret = zynq_fpga_wait_fordone(priv);
+ if (ret) {
+ dev_err(&mgr->dev, "DSTDMA: Timeout waiting for D_P_DONE\n");
+ goto out;
+ }
+
+ /* Write to PCAP */
+ cmdindex = 2;
+ buf[cmdindex++] = zynq_type1_pkt(TYPE_CMD_OFFSET,
+ TYPE_OPCODE_WRITE, 1);
+ buf[cmdindex++] = DESYNC_WORD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ buf[cmdindex++] = NOOP_WORD_MASK;
+ zynq_fpga_dma_xfer(priv, dma_addr + src_dmaoffset, cmdindex,
+ DMA_INVALID_ADDRESS, 0);
+ ret = zynq_fpga_wait_fordone(priv);
+ if (ret)
+ dev_err(&mgr->dev, "SRCDMA1: Timeout waiting for D_P_DONE\n");
+out:
+ return ret;
+}
+
+static int zynq_fpga_read_cfgreg(struct fpga_manager *mgr,
+ struct seq_file *s)
+{
+ int ret = 0;
+ unsigned int *buf;
+ dma_addr_t dma_addr;
+ struct zynq_configreg *p = cfgreg;
+
+ buf = dma_zalloc_coherent(mgr->dev.parent, READ_DMA_SIZE,
+ &dma_addr, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ seq_puts(s, "zynq FPGA Configuration register contents are\n");
+
+ while (p->reg) {
+ ret = zynq_fpga_getconfigreg(mgr, p->offset, dma_addr, buf);
+ if (ret)
+ goto free_dmabuf;
+ seq_printf(s, "%s --> \t %x \t\r\n", p->reg, buf[0]);
+ p++;
+ }
+
+free_dmabuf:
+ dma_free_coherent(mgr->dev.parent, READ_DMA_SIZE, buf,
+ dma_addr);
+ return ret;
+}
+
+static int zynq_fpga_ops_read(struct fpga_manager *mgr, struct seq_file *s)
+{
+ struct zynq_fpga_priv *priv;
+ int ret;
+
+ priv = mgr->priv;
+
+ ret = clk_enable(priv->clk);
+ if (ret)
+ return ret;
+
+ if (readback_type)
+ ret = zynq_fpga_read_cfgdata(mgr, s);
+ else
+ ret = zynq_fpga_read_cfgreg(mgr, s);
+
+ clk_disable(priv->clk);
+
+ return ret;
+}
+
static const struct fpga_manager_ops zynq_fpga_ops = {
.initial_header_size = 128,
.state = zynq_fpga_ops_state,
.write_init = zynq_fpga_ops_write_init,
.write_sg = zynq_fpga_ops_write,
.write_complete = zynq_fpga_ops_write_complete,
+ .read = zynq_fpga_ops_read,
};

static int zynq_fpga_probe(struct platform_device *pdev)
--
2.7.4
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