mailbox: zynqmp: ipi mailbox driver

ZynqMP mailbox driver implementing IPI communication with PMU. This would
allow U-Boot SPL to communicate with PMUFW to request privileged
operations.

Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 59c766f2066a3ae4fa884143064daf6fe4d6ecaa..6af9816a4a08bf0f51d4e7aea9a630b4db82c5ad 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -449,6 +449,7 @@ F:  drivers/gpio/zynq_gpio.c
 F:     drivers/i2c/i2c-cdns.c
 F:     drivers/i2c/muxes/pca954x.c
 F:     drivers/i2c/zynq_i2c.c
+F:     drivers/mailbox/zynqmp-ipi.c
 F:     drivers/mmc/zynq_sdhci.c
 F:     drivers/mtd/nand/raw/zynq_nand.c
 F:     drivers/net/phy/xilinx_phy.c

diff --git a/arch/arm/mach-zynqmp/include/mach/sys_proto.h b/arch/arm/mach-zynqmp/include/mach/sys_proto.h
index 915badc6fbee702ea93a208f8d4301191ded2f39..f25d414dcb1e3f7f01cd314854bfb692cecad08e 100644 (file)
--- a/arch/arm/mach-zynqmp/include/mach/sys_proto.h
+++ b/arch/arm/mach-zynqmp/include/mach/sys_proto.h
@@ -54,6 +54,11 @@ enum {
        TCM_SPLIT,
 };
 
+struct zynqmp_ipi_msg {
+       size_t len;
+       u32 *buf;
+};
+
 int zynq_board_read_rom_ethaddr(unsigned char *ethaddr);
 unsigned int zynqmp_get_silicon_version(void);
 

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 11bf5522db53ff87c46501ac757bdc13553f6c66..85c2a829aed87b2312f7c64b073a260bf90f9a30 100644 (file)
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -41,4 +41,10 @@ config K3_SEC_PROXY
          Select this driver if your platform has support for this hardware
          block.
 
+config ZYNQMP_IPI
+       bool "Xilinx ZynqMP IPI controller support"
+       depends on DM_MAILBOX && ARCH_ZYNQMP
+       help
+         This enables support for the Xilinx ZynqMP Inter Processor Interrupt
+         communication controller.
 endmenu

diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index a753cc4e6806c8ca1f1445ecdf367e114201a7c8..d2ace8cd212e339d29fa189ef36d98c8d3e67096 100644 (file)
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_SANDBOX_MBOX) += sandbox-mbox-test.o
 obj-$(CONFIG_STM32_IPCC) += stm32-ipcc.o
 obj-$(CONFIG_TEGRA_HSP) += tegra-hsp.o
 obj-$(CONFIG_K3_SEC_PROXY) += k3-sec-proxy.o
+obj-$(CONFIG_ZYNQMP_IPI) += zynqmp-ipi.o

diff --git a/drivers/mailbox/zynqmp-ipi.c b/drivers/mailbox/zynqmp-ipi.c
new file mode 100644 (file)
index 0000000..c181a7b
--- /dev/null
+++ b/drivers/mailbox/zynqmp-ipi.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Xilinx Zynq MPSoC Mailbox driver
+ *
+ * Copyright (C) 2018-2019 Xilinx, Inc.
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <mailbox-uclass.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 ist;  /* 0x8  */
+       u32 imr;  /* 0xC  */
+       u32 ier;  /* 0x10 */
+       u32 idr;  /* 0x14 */
+};
+
+#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,
+                               100, 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;
+
+       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_alloc_size = sizeof(struct zynqmp_ipi),
+       .ops = &zynqmp_ipi_mbox_ops,
+};