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- // 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_alloc_size = sizeof(struct zynqmp_ipi),
- .ops = &zynqmp_ipi_mbox_ops,
- };
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