fpga: xilinx: zynqmp: Add PL bitstream download support for ZynqMP

Add PL bitstream dowload support for ZynqMP
Bitstream will be validated by uboot and loaded
to PL by invoking an smc instruction to ATF which route this request to
PMU FW which will take care of loading it to PL

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

4 files changed, 262 insertions, 0 deletions

diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index 1ba02f0982..f3f6bf7f67 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -1,3 +1,20 @@
 menu "FPGA support"
 
+config FPGA
+	bool
+
+config FPGA_XILINX
+	bool "Enable Xilinx FPGA drivers"
+	select FPGA
+	help
+	  Enable Xilinx FPGA specific functions which includes bitstream
+	  (in BIT format), fpga and device validation.
+
+config FPGA_ZYNQMPPL
+	bool "Enable Xilinx FPGA driver for ZynqMP"
+	depends on FPGA_XILINX
+	help
+	  Enable FPGA driver for loading bitstream in BIT and BIN format
+	  on Xilinx Zynq UltraScale+ (ZynqMP) device.
+
 endmenu
diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
index fec3fecbdf..777706f186 100644
--- a/drivers/fpga/Makefile
+++ b/drivers/fpga/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_FPGA_SPARTAN2) += spartan2.o
 obj-$(CONFIG_FPGA_SPARTAN3) += spartan3.o
 obj-$(CONFIG_FPGA_VIRTEX2) += virtex2.o
 obj-$(CONFIG_FPGA_ZYNQPL) += zynqpl.o
+obj-$(CONFIG_FPGA_ZYNQMPPL) += zynqmppl.o
 obj-$(CONFIG_FPGA_XILINX) += xilinx.o
 obj-$(CONFIG_FPGA_LATTICE) += ivm_core.o lattice.o
 ifdef CONFIG_FPGA_ALTERA
diff --git a/drivers/fpga/xilinx.c b/drivers/fpga/xilinx.c
index d459a2f7a5..2cd0104d8b 100644
--- a/drivers/fpga/xilinx.c
+++ b/drivers/fpga/xilinx.c
@@ -199,6 +199,9 @@ int xilinx_info(xilinx_desc *desc)
 		case xilinx_zynq:
 			printf("Zynq PL\n");
 			break;
+		case xilinx_zynqmp:
+			printf("ZynqMP PL\n");
+			break;
 			/* Add new family types here */
 		default:
 			printf ("Unknown family type, %d\n", desc->family);
@@ -227,6 +230,9 @@ int xilinx_info(xilinx_desc *desc)
 		case devcfg:
 			printf("Device configuration interface (Zynq)\n");
 			break;
+		case csu_dma:
+			printf("csu_dma configuration interface (ZynqMP)\n");
+			break;
 			/* Add new interface types here */
 		default:
 			printf ("Unsupported interface type, %d\n", desc->iface);
diff --git a/drivers/fpga/zynqmppl.c b/drivers/fpga/zynqmppl.c
new file mode 100644
index 0000000000..23039c3eb2
--- /dev/null
+++ b/drivers/fpga/zynqmppl.c
@@ -0,0 +1,238 @@
+/*
+ * (C) Copyright 2015 - 2016, Xilinx, Inc,
+ * Michal Simek <michal.simek@xilinx.com>
+ * Siva Durga Prasad <siva.durga.paladugu@xilinx.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <console.h>
+#include <common.h>
+#include <zynqmppl.h>
+#include <linux/sizes.h>
+
+#define DUMMY_WORD	0xffffffff
+
+/* Xilinx binary format header */
+static const u32 bin_format[] = {
+	DUMMY_WORD, /* Dummy words */
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	DUMMY_WORD,
+	0x000000bb, /* Sync word */
+	0x11220044, /* Sync word */
+	DUMMY_WORD,
+	DUMMY_WORD,
+	0xaa995566, /* Sync word */
+};
+
+#define SWAP_NO		1
+#define SWAP_DONE	2
+
+/*
+ * Load the whole word from unaligned buffer
+ * Keep in your mind that it is byte loading on little-endian system
+ */
+static u32 load_word(const void *buf, u32 swap)
+{
+	u32 word = 0;
+	u8 *bitc = (u8 *)buf;
+	int p;
+
+	if (swap == SWAP_NO) {
+		for (p = 0; p < 4; p++) {
+			word <<= 8;
+			word |= bitc[p];
+		}
+	} else {
+		for (p = 3; p >= 0; p--) {
+			word <<= 8;
+			word |= bitc[p];
+		}
+	}
+
+	return word;
+}
+
+static u32 check_header(const void *buf)
+{
+	u32 i, pattern;
+	int swap = SWAP_NO;
+	u32 *test = (u32 *)buf;
+
+	debug("%s: Let's check bitstream header\n", __func__);
+
+	/* Checking that passing bin is not a bitstream */
+	for (i = 0; i < ARRAY_SIZE(bin_format); i++) {
+		pattern = load_word(&test[i], swap);
+
+		/*
+		 * Bitstreams in binary format are swapped
+		 * compare to regular bistream.
+		 * Do not swap dummy word but if swap is done assume
+		 * that parsing buffer is binary format
+		 */
+		if ((__swab32(pattern) != DUMMY_WORD) &&
+		    (__swab32(pattern) == bin_format[i])) {
+			swap = SWAP_DONE;
+			debug("%s: data swapped - let's swap\n", __func__);
+		}
+
+		debug("%s: %d/%px: pattern %x/%x bin_format\n", __func__, i,
+		      &test[i], pattern, bin_format[i]);
+	}
+	debug("%s: Found bitstream header at %px %s swapinng\n", __func__,
+	      buf, swap == SWAP_NO ? "without" : "with");
+
+	return swap;
+}
+
+static void *check_data(u8 *buf, size_t bsize, u32 *swap)
+{
+	u32 word, p = 0; /* possition */
+
+	/* Because buf doesn't need to be aligned let's read it by chars */
+	for (p = 0; p < bsize; p++) {
+		word = load_word(&buf[p], SWAP_NO);
+		debug("%s: word %x %x/%px\n", __func__, word, p, &buf[p]);
+
+		/* Find the first bitstream dummy word */
+		if (word == DUMMY_WORD) {
+			debug("%s: Found dummy word at position %x/%px\n",
+			      __func__, p, &buf[p]);
+			*swap = check_header(&buf[p]);
+			if (*swap) {
+				/* FIXME add full bitstream checking here */
+				return &buf[p];
+			}
+		}
+		/* Loop can be huge - support CTRL + C */
+		if (ctrlc())
+			return NULL;
+	}
+	return NULL;
+}
+
+static ulong zynqmp_align_dma_buffer(u32 *buf, u32 len, u32 swap)
+{
+	u32 *new_buf;
+	u32 i;
+
+	if ((ulong)buf != ALIGN((ulong)buf, ARCH_DMA_MINALIGN)) {
+		new_buf = (u32 *)ALIGN((ulong)buf, ARCH_DMA_MINALIGN);
+
+		/*
+		 * This might be dangerous but permits to flash if
+		 * ARCH_DMA_MINALIGN is greater than header size
+		 */
+		if (new_buf > (u32 *)buf) {
+			debug("%s: Aligned buffer is after buffer start\n",
+			      __func__);
+			new_buf -= ARCH_DMA_MINALIGN;
+		}
+		printf("%s: Align buffer at %px to %px(swap %d)\n", __func__,
+		       buf, new_buf, swap);
+
+		for (i = 0; i < (len/4); i++)
+			new_buf[i] = load_word(&buf[i], swap);
+
+		buf = new_buf;
+	} else if (swap != SWAP_DONE) {
+		/* For bitstream which are aligned */
+		u32 *new_buf = (u32 *)buf;
+
+		printf("%s: Bitstream is not swapped(%d) - swap it\n", __func__,
+		       swap);
+
+		for (i = 0; i < (len/4); i++)
+			new_buf[i] = load_word(&buf[i], swap);
+	}
+
+	return (ulong)buf;
+}
+
+static int zynqmp_validate_bitstream(xilinx_desc *desc, const void *buf,
+				   size_t bsize, u32 blocksize, u32 *swap)
+{
+	ulong *buf_start;
+	ulong diff;
+
+	buf_start = check_data((u8 *)buf, blocksize, swap);
+
+	if (!buf_start)
+		return FPGA_FAIL;
+
+	/* Check if data is postpone from start */
+	diff = (ulong)buf_start - (ulong)buf;
+	if (diff) {
+		printf("%s: Bitstream is not validated yet (diff %lx)\n",
+		       __func__, diff);
+		return FPGA_FAIL;
+	}
+
+	if ((ulong)buf < SZ_1M) {
+		printf("%s: Bitstream has to be placed up to 1MB (%px)\n",
+		       __func__, buf);
+		return FPGA_FAIL;
+	}
+
+	return 0;
+}
+
+static int invoke_smc(ulong id, ulong reg0, ulong reg1, ulong reg2)
+{
+	struct pt_regs regs;
+	regs.regs[0] = id;
+	regs.regs[1] = reg0;
+	regs.regs[2] = reg1;
+	regs.regs[3] = reg2;
+
+	smc_call(&regs);
+
+	return regs.regs[0];
+}
+
+static int zynqmp_load(xilinx_desc *desc, const void *buf, size_t bsize,
+		     bitstream_type bstype)
+{
+	u32 swap;
+	ulong bin_buf, flags;
+	int ret;
+
+	if (zynqmp_validate_bitstream(desc, buf, bsize, bsize, &swap))
+		return FPGA_FAIL;
+
+	bin_buf = zynqmp_align_dma_buffer((u32 *)buf, bsize, swap);
+
+	debug("%s called!\n", __func__);
+	flush_dcache_range(bin_buf, bin_buf + bsize);
+
+	if (bsize % 4)
+		bsize = bsize / 4 + 1;
+	else
+		bsize = bsize / 4;
+
+	flags = (u32)bsize | ((u64)bstype << 32);
+
+	ret = invoke_smc(ZYNQMP_SIP_SVC_PM_FPGA_LOAD, bin_buf, flags, 0);
+	if (ret)
+		debug("PL FPGA LOAD fail\n");
+
+	return ret;
+}
+
+struct xilinx_fpga_op zynqmp_op = {
+	.load = zynqmp_load,
+};