mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 19:10:13 +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>
241 lines
5.6 KiB
C
241 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <div64.h>
|
|
#include <errno.h>
|
|
#include <serial.h>
|
|
#include <asm/io.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/types.h>
|
|
#include <dm/pinctrl.h>
|
|
#include <mach/ar71xx_regs.h>
|
|
|
|
#define AR933X_UART_DATA_REG 0x00
|
|
#define AR933X_UART_CS_REG 0x04
|
|
#define AR933X_UART_CLK_REG 0x08
|
|
|
|
#define AR933X_UART_DATA_TX_RX_MASK 0xff
|
|
#define AR933X_UART_DATA_RX_CSR BIT(8)
|
|
#define AR933X_UART_DATA_TX_CSR BIT(9)
|
|
#define AR933X_UART_CS_IF_MODE_S 2
|
|
#define AR933X_UART_CS_IF_MODE_M 0x3
|
|
#define AR933X_UART_CS_IF_MODE_DTE 1
|
|
#define AR933X_UART_CS_IF_MODE_DCE 2
|
|
#define AR933X_UART_CS_TX_RDY_ORIDE BIT(7)
|
|
#define AR933X_UART_CS_RX_RDY_ORIDE BIT(8)
|
|
#define AR933X_UART_CLK_STEP_M 0xffff
|
|
#define AR933X_UART_CLK_SCALE_M 0xfff
|
|
#define AR933X_UART_CLK_SCALE_S 16
|
|
#define AR933X_UART_CLK_STEP_S 0
|
|
|
|
struct ar933x_serial_priv {
|
|
void __iomem *regs;
|
|
};
|
|
|
|
/*
|
|
* Baudrate algorithm come from Linux/drivers/tty/serial/ar933x_uart.c
|
|
* baudrate = (clk / (scale + 1)) * (step * (1 / 2^17))
|
|
*/
|
|
static u32 ar933x_serial_get_baud(u32 clk, u32 scale, u32 step)
|
|
{
|
|
u64 t;
|
|
u32 div;
|
|
|
|
div = (2 << 16) * (scale + 1);
|
|
t = clk;
|
|
t *= step;
|
|
t += (div / 2);
|
|
do_div(t, div);
|
|
|
|
return t;
|
|
}
|
|
|
|
static void ar933x_serial_get_scale_step(u32 clk, u32 baud,
|
|
u32 *scale, u32 *step)
|
|
{
|
|
u32 tscale, baudrate;
|
|
long min_diff;
|
|
|
|
*scale = 0;
|
|
*step = 0;
|
|
|
|
min_diff = baud;
|
|
for (tscale = 0; tscale < AR933X_UART_CLK_SCALE_M; tscale++) {
|
|
u64 tstep;
|
|
int diff;
|
|
|
|
tstep = baud * (tscale + 1);
|
|
tstep *= (2 << 16);
|
|
do_div(tstep, clk);
|
|
|
|
if (tstep > AR933X_UART_CLK_STEP_M)
|
|
break;
|
|
|
|
baudrate = ar933x_serial_get_baud(clk, tscale, tstep);
|
|
diff = abs(baudrate - baud);
|
|
if (diff < min_diff) {
|
|
min_diff = diff;
|
|
*scale = tscale;
|
|
*step = tstep;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int ar933x_serial_setbrg(struct udevice *dev, int baudrate)
|
|
{
|
|
struct ar933x_serial_priv *priv = dev_get_priv(dev);
|
|
u32 val, scale, step;
|
|
|
|
val = get_serial_clock();
|
|
ar933x_serial_get_scale_step(val, baudrate, &scale, &step);
|
|
|
|
val = (scale & AR933X_UART_CLK_SCALE_M)
|
|
<< AR933X_UART_CLK_SCALE_S;
|
|
val |= (step & AR933X_UART_CLK_STEP_M)
|
|
<< AR933X_UART_CLK_STEP_S;
|
|
writel(val, priv->regs + AR933X_UART_CLK_REG);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ar933x_serial_putc(struct udevice *dev, const char c)
|
|
{
|
|
struct ar933x_serial_priv *priv = dev_get_priv(dev);
|
|
u32 data;
|
|
|
|
data = readl(priv->regs + AR933X_UART_DATA_REG);
|
|
if (!(data & AR933X_UART_DATA_TX_CSR))
|
|
return -EAGAIN;
|
|
|
|
data = (u32)c | AR933X_UART_DATA_TX_CSR;
|
|
writel(data, priv->regs + AR933X_UART_DATA_REG);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ar933x_serial_getc(struct udevice *dev)
|
|
{
|
|
struct ar933x_serial_priv *priv = dev_get_priv(dev);
|
|
u32 data;
|
|
|
|
data = readl(priv->regs + AR933X_UART_DATA_REG);
|
|
if (!(data & AR933X_UART_DATA_RX_CSR))
|
|
return -EAGAIN;
|
|
|
|
writel(AR933X_UART_DATA_RX_CSR, priv->regs + AR933X_UART_DATA_REG);
|
|
return data & AR933X_UART_DATA_TX_RX_MASK;
|
|
}
|
|
|
|
static int ar933x_serial_pending(struct udevice *dev, bool input)
|
|
{
|
|
struct ar933x_serial_priv *priv = dev_get_priv(dev);
|
|
u32 data;
|
|
|
|
data = readl(priv->regs + AR933X_UART_DATA_REG);
|
|
if (input)
|
|
return (data & AR933X_UART_DATA_RX_CSR) ? 1 : 0;
|
|
else
|
|
return (data & AR933X_UART_DATA_TX_CSR) ? 0 : 1;
|
|
}
|
|
|
|
static int ar933x_serial_probe(struct udevice *dev)
|
|
{
|
|
struct ar933x_serial_priv *priv = dev_get_priv(dev);
|
|
fdt_addr_t addr;
|
|
u32 val;
|
|
|
|
addr = devfdt_get_addr(dev);
|
|
if (addr == FDT_ADDR_T_NONE)
|
|
return -EINVAL;
|
|
|
|
priv->regs = map_physmem(addr, AR933X_UART_SIZE,
|
|
MAP_NOCACHE);
|
|
|
|
/*
|
|
* UART controller configuration:
|
|
* - no DMA
|
|
* - no interrupt
|
|
* - DCE mode
|
|
* - no flow control
|
|
* - set RX ready oride
|
|
* - set TX ready oride
|
|
*/
|
|
val = (AR933X_UART_CS_IF_MODE_DCE << AR933X_UART_CS_IF_MODE_S) |
|
|
AR933X_UART_CS_TX_RDY_ORIDE | AR933X_UART_CS_RX_RDY_ORIDE;
|
|
writel(val, priv->regs + AR933X_UART_CS_REG);
|
|
return 0;
|
|
}
|
|
|
|
static const struct dm_serial_ops ar933x_serial_ops = {
|
|
.putc = ar933x_serial_putc,
|
|
.pending = ar933x_serial_pending,
|
|
.getc = ar933x_serial_getc,
|
|
.setbrg = ar933x_serial_setbrg,
|
|
};
|
|
|
|
static const struct udevice_id ar933x_serial_ids[] = {
|
|
{ .compatible = "qca,ar9330-uart" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(serial_ar933x) = {
|
|
.name = "serial_ar933x",
|
|
.id = UCLASS_SERIAL,
|
|
.of_match = ar933x_serial_ids,
|
|
.priv_auto_alloc_size = sizeof(struct ar933x_serial_priv),
|
|
.probe = ar933x_serial_probe,
|
|
.ops = &ar933x_serial_ops,
|
|
};
|
|
|
|
#ifdef CONFIG_DEBUG_UART_AR933X
|
|
|
|
#include <debug_uart.h>
|
|
|
|
static inline void _debug_uart_init(void)
|
|
{
|
|
void __iomem *regs = (void *)CONFIG_DEBUG_UART_BASE;
|
|
u32 val, scale, step;
|
|
|
|
/*
|
|
* UART controller configuration:
|
|
* - no DMA
|
|
* - no interrupt
|
|
* - DCE mode
|
|
* - no flow control
|
|
* - set RX ready oride
|
|
* - set TX ready oride
|
|
*/
|
|
val = (AR933X_UART_CS_IF_MODE_DCE << AR933X_UART_CS_IF_MODE_S) |
|
|
AR933X_UART_CS_TX_RDY_ORIDE | AR933X_UART_CS_RX_RDY_ORIDE;
|
|
writel(val, regs + AR933X_UART_CS_REG);
|
|
|
|
ar933x_serial_get_scale_step(CONFIG_DEBUG_UART_CLOCK,
|
|
CONFIG_BAUDRATE, &scale, &step);
|
|
|
|
val = (scale & AR933X_UART_CLK_SCALE_M)
|
|
<< AR933X_UART_CLK_SCALE_S;
|
|
val |= (step & AR933X_UART_CLK_STEP_M)
|
|
<< AR933X_UART_CLK_STEP_S;
|
|
writel(val, regs + AR933X_UART_CLK_REG);
|
|
}
|
|
|
|
static inline void _debug_uart_putc(int c)
|
|
{
|
|
void __iomem *regs = (void *)CONFIG_DEBUG_UART_BASE;
|
|
u32 data;
|
|
|
|
do {
|
|
data = readl(regs + AR933X_UART_DATA_REG);
|
|
} while (!(data & AR933X_UART_DATA_TX_CSR));
|
|
|
|
data = (u32)c | AR933X_UART_DATA_TX_CSR;
|
|
writel(data, regs + AR933X_UART_DATA_REG);
|
|
}
|
|
|
|
DEBUG_UART_FUNCS
|
|
|
|
#endif
|