1 files changed, 142 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/mailbox/zynqmp-ipi.c b/roms/u-boot/drivers/mailbox/zynqmp-ipi.c
new file mode 100644
index 000000000..959cce923
--- /dev/null
+++ b/roms/u-boot/drivers/mailbox/zynqmp-ipi.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Xilinx Zynq MPSoC Mailbox driver
+ *
+ * Copyright (C) 2018-2019 Xilinx, Inc.
+ */
+
+#include <common.h>
+#include <log.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <mailbox-uclass.h>
+#include <dm/device_compat.h>
+#include <mach/sys_proto.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <wait_bit.h>
+
+/* IPI bitmasks, register base */
+/* TODO: move reg base to DT */
+#define IPI_BIT_MASK_PMU0     0x10000
+#define IPI_INT_REG_BASE_APU  0xFF300000
+
+struct ipi_int_regs {
+	u32 trig; /* 0x0  */
+	u32 obs;  /* 0x4  */
+	u32 dummy0;
+	u32 dummy1;
+	u32 isr;  /* 0x10  */
+	u32 imr;  /* 0x14  */
+	u32 ier;  /* 0x18 */
+	u32 idr;  /* 0x1C */
+};
+
+#define ipi_int_apu ((struct ipi_int_regs *)IPI_INT_REG_BASE_APU)
+
+struct zynqmp_ipi {
+	void __iomem *local_req_regs;
+	void __iomem *local_res_regs;
+	void __iomem *remote_req_regs;
+	void __iomem *remote_res_regs;
+};
+
+static int zynqmp_ipi_send(struct mbox_chan *chan, const void *data)
+{
+	const struct zynqmp_ipi_msg *msg = (struct zynqmp_ipi_msg *)data;
+	struct zynqmp_ipi *zynqmp = dev_get_priv(chan->dev);
+	u32 ret;
+	u32 *mbx = (u32 *)zynqmp->local_req_regs;
+
+	for (size_t i = 0; i < msg->len; i++)
+		writel(msg->buf[i], &mbx[i]);
+
+	/* Write trigger interrupt */
+	writel(IPI_BIT_MASK_PMU0, &ipi_int_apu->trig);
+
+	/* Wait until observation bit is cleared */
+	ret = wait_for_bit_le32(&ipi_int_apu->obs, IPI_BIT_MASK_PMU0, false,
+				1000, false);
+
+	debug("%s, send %ld bytes\n", __func__, msg->len);
+	return ret;
+};
+
+static int zynqmp_ipi_recv(struct mbox_chan *chan, void *data)
+{
+	struct zynqmp_ipi_msg *msg = (struct zynqmp_ipi_msg *)data;
+	struct zynqmp_ipi *zynqmp = dev_get_priv(chan->dev);
+	u32 *mbx = (u32 *)zynqmp->local_res_regs;
+
+	/*
+	 * PMU Firmware does not trigger IPI interrupt for API call responses so
+	 * there is no need to check ISR flags
+	 */
+	for (size_t i = 0; i < msg->len; i++)
+		msg->buf[i] = readl(&mbx[i]);
+
+	debug("%s, recv %ld bytes\n", __func__, msg->len);
+	return 0;
+};
+
+static int zynqmp_ipi_probe(struct udevice *dev)
+{
+	struct zynqmp_ipi *zynqmp = dev_get_priv(dev);
+	struct resource res;
+	ofnode node;
+
+	debug("%s(dev=%p)\n", __func__, dev);
+
+	/* Get subnode where the regs are defined */
+	/* Note IPI mailbox node needs to be the first one in DT */
+	node = ofnode_first_subnode(dev_ofnode(dev));
+
+	if (ofnode_read_resource_byname(node, "local_request_region", &res)) {
+		dev_err(dev, "No reg property for local_request_region\n");
+		return -EINVAL;
+	};
+	zynqmp->local_req_regs = devm_ioremap(dev, res.start,
+					      (res.start - res.end));
+
+	if (ofnode_read_resource_byname(node, "local_response_region", &res)) {
+		dev_err(dev, "No reg property for local_response_region\n");
+		return -EINVAL;
+	};
+	zynqmp->local_res_regs = devm_ioremap(dev, res.start,
+					      (res.start - res.end));
+
+	if (ofnode_read_resource_byname(node, "remote_request_region", &res)) {
+		dev_err(dev, "No reg property for remote_request_region\n");
+		return -EINVAL;
+	};
+	zynqmp->remote_req_regs = devm_ioremap(dev, res.start,
+					       (res.start - res.end));
+
+	if (ofnode_read_resource_byname(node, "remote_response_region", &res)) {
+		dev_err(dev, "No reg property for remote_response_region\n");
+		return -EINVAL;
+	};
+	zynqmp->remote_res_regs = devm_ioremap(dev, res.start,
+					       (res.start - res.end));
+
+	return 0;
+};
+
+static const struct udevice_id zynqmp_ipi_ids[] = {
+	{ .compatible = "xlnx,zynqmp-ipi-mailbox" },
+	{ }
+};
+
+struct mbox_ops zynqmp_ipi_mbox_ops = {
+	.send = zynqmp_ipi_send,
+	.recv = zynqmp_ipi_recv,
+};
+
+U_BOOT_DRIVER(zynqmp_ipi) = {
+	.name = "zynqmp_ipi",
+	.id = UCLASS_MAILBOX,
+	.of_match = zynqmp_ipi_ids,
+	.probe = zynqmp_ipi_probe,
+	.priv_auto	= sizeof(struct zynqmp_ipi),
+	.ops = &zynqmp_ipi_mbox_ops,
+};