mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 15:37:23 +00:00
5b0b43e0e2
We move qfw into its own uclass and split the PIO functions into a specific driver for that uclass. The PIO driver is selected in the qemu-x86 board config (this covers x86 and x86_64). include/qfw.h is cleaned up and documentation added. Signed-off-by: Asherah Connor <ashe@kivikakk.ee> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* PIO 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/io.h>
|
|
#include <dm/device.h>
|
|
#include <qfw.h>
|
|
|
|
/*
|
|
* PIO ports are correct for x86, which appears to be the only arch that uses
|
|
* PIO.
|
|
*/
|
|
#define FW_CONTROL_PORT 0x510
|
|
#define FW_DATA_PORT 0x511
|
|
#define FW_DMA_PORT_LOW 0x514
|
|
#define FW_DMA_PORT_HIGH 0x518
|
|
|
|
static void qfw_pio_read_entry_io(struct udevice *dev, u16 entry, u32 size,
|
|
void *address)
|
|
{
|
|
/*
|
|
* 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 IO port, the
|
|
* endianness is little endian.
|
|
*/
|
|
if (entry != FW_CFG_INVALID)
|
|
outw(cpu_to_le16(entry), FW_CONTROL_PORT);
|
|
|
|
/* the endianness of data register is string-preserving */
|
|
u32 i = 0;
|
|
u8 *data = address;
|
|
|
|
while (size--)
|
|
data[i++] = inb(FW_DATA_PORT);
|
|
}
|
|
|
|
/* Read configuration item using fw_cfg DMA interface */
|
|
static void qfw_pio_read_entry_dma(struct udevice *dev, struct qfw_dma *dma)
|
|
{
|
|
/* the DMA address register is big-endian */
|
|
outl(cpu_to_be32((uintptr_t)dma), FW_DMA_PORT_HIGH);
|
|
|
|
while (be32_to_cpu(dma->control) & ~FW_CFG_DMA_ERROR);
|
|
}
|
|
|
|
static int qfw_pio_probe(struct udevice *dev)
|
|
{
|
|
return qfw_register(dev);
|
|
}
|
|
|
|
static struct dm_qfw_ops qfw_pio_ops = {
|
|
.read_entry_io = qfw_pio_read_entry_io,
|
|
.read_entry_dma = qfw_pio_read_entry_dma,
|
|
};
|
|
|
|
U_BOOT_DRIVER(qfw_pio) = {
|
|
.name = "qfw_pio",
|
|
.id = UCLASS_QFW,
|
|
.probe = qfw_pio_probe,
|
|
.ops = &qfw_pio_ops,
|
|
};
|