mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-25 20:43:32 +00:00
5830b57bf9
Add MMIO driver for QFW. Note that there is no consumer as of this patch. Signed-off-by: Asherah Connor <ashe@kivikakk.ee> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* MMIO interface for QFW
|
|
*
|
|
* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
|
|
* (C) Copyright 2021 Asherah Connor <ashe@kivikakk.ee>
|
|
*/
|
|
|
|
#define LOG_CATEGORY UCLASS_QFW
|
|
|
|
#include <asm/types.h>
|
|
#include <asm/io.h>
|
|
#include <dm.h>
|
|
#include <dm/device.h>
|
|
#include <qfw.h>
|
|
|
|
struct qfw_mmio {
|
|
/*
|
|
* Each access to the 64-bit data register can be 8/16/32/64 bits wide.
|
|
*/
|
|
union {
|
|
u8 data8;
|
|
u16 data16;
|
|
u32 data32;
|
|
u64 data64;
|
|
};
|
|
u16 selector;
|
|
u8 padding[6];
|
|
u64 dma;
|
|
};
|
|
|
|
struct qfw_mmio_plat {
|
|
volatile struct qfw_mmio *mmio;
|
|
};
|
|
|
|
static void qfw_mmio_read_entry_io(struct udevice *dev, u16 entry, u32 size,
|
|
void *address)
|
|
{
|
|
struct qfw_mmio_plat *plat = dev_get_plat(dev);
|
|
|
|
/*
|
|
* writing FW_CFG_INVALID will cause read operation to resume at last
|
|
* offset, otherwise read will start at offset 0
|
|
*
|
|
* Note: on platform where the control register is MMIO, the register
|
|
* is big endian.
|
|
*/
|
|
if (entry != FW_CFG_INVALID)
|
|
plat->mmio->selector = cpu_to_be16(entry);
|
|
|
|
/* the endianness of data register is string-preserving */
|
|
while (size >= 8) {
|
|
*(u64 *)address = plat->mmio->data64;
|
|
address += 8;
|
|
size -= 8;
|
|
}
|
|
while (size >= 4) {
|
|
*(u32 *)address = plat->mmio->data32;
|
|
address += 4;
|
|
size -= 4;
|
|
}
|
|
while (size >= 2) {
|
|
*(u16 *)address = plat->mmio->data16;
|
|
address += 2;
|
|
size -= 2;
|
|
}
|
|
while (size >= 1) {
|
|
*(u8 *)address = plat->mmio->data8;
|
|
address += 1;
|
|
size -= 1;
|
|
}
|
|
}
|
|
|
|
/* Read configuration item using fw_cfg DMA interface */
|
|
static void qfw_mmio_read_entry_dma(struct udevice *dev, struct qfw_dma *dma)
|
|
{
|
|
struct qfw_mmio_plat *plat = dev_get_plat(dev);
|
|
|
|
/* the DMA address register is big-endian */
|
|
plat->mmio->dma = cpu_to_be64((uintptr_t)dma);
|
|
|
|
while (be32_to_cpu(dma->control) & ~FW_CFG_DMA_ERROR);
|
|
}
|
|
|
|
static int qfw_mmio_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct qfw_mmio_plat *plat = dev_get_plat(dev);
|
|
|
|
plat->mmio = map_physmem(dev_read_addr(dev),
|
|
sizeof(struct qfw_mmio),
|
|
MAP_NOCACHE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qfw_mmio_probe(struct udevice *dev)
|
|
{
|
|
return qfw_register(dev);
|
|
}
|
|
|
|
static struct dm_qfw_ops qfw_mmio_ops = {
|
|
.read_entry_io = qfw_mmio_read_entry_io,
|
|
.read_entry_dma = qfw_mmio_read_entry_dma,
|
|
};
|
|
|
|
static const struct udevice_id qfw_mmio_ids[] = {
|
|
{ .compatible = "qemu,fw-cfg-mmio" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(qfw_mmio) = {
|
|
.name = "qfw_mmio",
|
|
.id = UCLASS_QFW,
|
|
.of_match = qfw_mmio_ids,
|
|
.plat_auto = sizeof(struct qfw_mmio_plat),
|
|
.of_to_plat = qfw_mmio_of_to_plat,
|
|
.probe = qfw_mmio_probe,
|
|
.ops = &qfw_mmio_ops,
|
|
};
|