mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-21 10:43:06 +00:00
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
// 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 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,
|
|
};
|