mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-05 20:54:31 +00:00
4687919684
When a driver declares DM_FLAG_PRE_RELOC flag, it wishes to be bound before relocation. However due to a bug in the DM core, the flag only takes effect when devices are statically declared via U_BOOT_DEVICE(). This bug has been fixed recently by commit "dm: core: Respect drivers with the DM_FLAG_PRE_RELOC flag in lists_bind_fdt()", but with the fix, it has a side effect that all existing drivers that declared DM_FLAG_PRE_RELOC flag will be bound before relocation now. This may expose potential boot failure on some boards due to insufficient memory during the pre-relocation stage. To mitigate this potential impact, the following changes are implemented: - Remove DM_FLAG_PRE_RELOC flag in the driver, if the driver only supports configuration from device tree (OF_CONTROL) - Keep DM_FLAG_PRE_RELOC flag in the driver only if the device is statically declared via U_BOOT_DEVICE() - Surround DM_FLAG_PRE_RELOC flag with OF_CONTROL check, for drivers that support both statically declared devices and configuration from device tree Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
159 lines
3.5 KiB
C
159 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <fdtdec.h>
|
|
#include <linux/compiler.h>
|
|
#include <serial.h>
|
|
|
|
struct meson_uart {
|
|
u32 wfifo;
|
|
u32 rfifo;
|
|
u32 control;
|
|
u32 status;
|
|
u32 misc;
|
|
};
|
|
|
|
struct meson_serial_platdata {
|
|
struct meson_uart *reg;
|
|
};
|
|
|
|
/* AML_UART_STATUS bits */
|
|
#define AML_UART_PARITY_ERR BIT(16)
|
|
#define AML_UART_FRAME_ERR BIT(17)
|
|
#define AML_UART_TX_FIFO_WERR BIT(18)
|
|
#define AML_UART_RX_EMPTY BIT(20)
|
|
#define AML_UART_TX_FULL BIT(21)
|
|
#define AML_UART_TX_EMPTY BIT(22)
|
|
#define AML_UART_XMIT_BUSY BIT(25)
|
|
#define AML_UART_ERR (AML_UART_PARITY_ERR | \
|
|
AML_UART_FRAME_ERR | \
|
|
AML_UART_TX_FIFO_WERR)
|
|
|
|
/* AML_UART_CONTROL bits */
|
|
#define AML_UART_TX_EN BIT(12)
|
|
#define AML_UART_RX_EN BIT(13)
|
|
#define AML_UART_TX_RST BIT(22)
|
|
#define AML_UART_RX_RST BIT(23)
|
|
#define AML_UART_CLR_ERR BIT(24)
|
|
|
|
static void meson_serial_init(struct meson_uart *uart)
|
|
{
|
|
u32 val;
|
|
|
|
val = readl(&uart->control);
|
|
val |= (AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLR_ERR);
|
|
writel(val, &uart->control);
|
|
val &= ~(AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLR_ERR);
|
|
writel(val, &uart->control);
|
|
val |= (AML_UART_RX_EN | AML_UART_TX_EN);
|
|
writel(val, &uart->control);
|
|
}
|
|
|
|
static int meson_serial_probe(struct udevice *dev)
|
|
{
|
|
struct meson_serial_platdata *plat = dev->platdata;
|
|
struct meson_uart *const uart = plat->reg;
|
|
|
|
meson_serial_init(uart);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int meson_serial_getc(struct udevice *dev)
|
|
{
|
|
struct meson_serial_platdata *plat = dev->platdata;
|
|
struct meson_uart *const uart = plat->reg;
|
|
|
|
if (readl(&uart->status) & AML_UART_RX_EMPTY)
|
|
return -EAGAIN;
|
|
|
|
return readl(&uart->rfifo) & 0xff;
|
|
}
|
|
|
|
static int meson_serial_putc(struct udevice *dev, const char ch)
|
|
{
|
|
struct meson_serial_platdata *plat = dev->platdata;
|
|
struct meson_uart *const uart = plat->reg;
|
|
|
|
if (readl(&uart->status) & AML_UART_TX_FULL)
|
|
return -EAGAIN;
|
|
|
|
writel(ch, &uart->wfifo);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int meson_serial_pending(struct udevice *dev, bool input)
|
|
{
|
|
struct meson_serial_platdata *plat = dev->platdata;
|
|
struct meson_uart *const uart = plat->reg;
|
|
uint32_t status = readl(&uart->status);
|
|
|
|
if (input)
|
|
return !(status & AML_UART_RX_EMPTY);
|
|
else
|
|
return !(status & AML_UART_TX_FULL);
|
|
}
|
|
|
|
static int meson_serial_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct meson_serial_platdata *plat = dev->platdata;
|
|
fdt_addr_t addr;
|
|
|
|
addr = devfdt_get_addr(dev);
|
|
if (addr == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
plat->reg = (struct meson_uart *)addr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_serial_ops meson_serial_ops = {
|
|
.putc = meson_serial_putc,
|
|
.pending = meson_serial_pending,
|
|
.getc = meson_serial_getc,
|
|
};
|
|
|
|
static const struct udevice_id meson_serial_ids[] = {
|
|
{ .compatible = "amlogic,meson-uart" },
|
|
{ .compatible = "amlogic,meson-gx-uart" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(serial_meson) = {
|
|
.name = "serial_meson",
|
|
.id = UCLASS_SERIAL,
|
|
.of_match = meson_serial_ids,
|
|
.probe = meson_serial_probe,
|
|
.ops = &meson_serial_ops,
|
|
.ofdata_to_platdata = meson_serial_ofdata_to_platdata,
|
|
.platdata_auto_alloc_size = sizeof(struct meson_serial_platdata),
|
|
};
|
|
|
|
#ifdef CONFIG_DEBUG_UART_MESON
|
|
|
|
#include <debug_uart.h>
|
|
|
|
static inline void _debug_uart_init(void)
|
|
{
|
|
}
|
|
|
|
static inline void _debug_uart_putc(int ch)
|
|
{
|
|
struct meson_uart *regs = (struct meson_uart *)CONFIG_DEBUG_UART_BASE;
|
|
|
|
while (readl(®s->status) & AML_UART_TX_FULL)
|
|
;
|
|
|
|
writel(ch, ®s->wfifo);
|
|
}
|
|
|
|
DEBUG_UART_FUNCS
|
|
|
|
#endif
|