mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 23:24:38 +00:00
61366b71a8
Add support for the debug UART to assist with early debugging. Enable it for i.CoreM6 as an example. Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> Reviewed-by: Simon Glass <sjg@chromium.org>
385 lines
10 KiB
C
385 lines
10 KiB
C
/*
|
|
* (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <watchdog.h>
|
|
#include <asm/arch/imx-regs.h>
|
|
#include <asm/arch/clock.h>
|
|
#include <dm/platform_data/serial_mxc.h>
|
|
#include <serial.h>
|
|
#include <linux/compiler.h>
|
|
|
|
/* UART Control Register Bit Fields.*/
|
|
#define URXD_CHARRDY (1<<15)
|
|
#define URXD_ERR (1<<14)
|
|
#define URXD_OVRRUN (1<<13)
|
|
#define URXD_FRMERR (1<<12)
|
|
#define URXD_BRK (1<<11)
|
|
#define URXD_PRERR (1<<10)
|
|
#define URXD_RX_DATA (0xFF)
|
|
#define UCR1_ADEN (1<<15) /* Auto dectect interrupt */
|
|
#define UCR1_ADBR (1<<14) /* Auto detect baud rate */
|
|
#define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */
|
|
#define UCR1_IDEN (1<<12) /* Idle condition interrupt */
|
|
#define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */
|
|
#define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */
|
|
#define UCR1_IREN (1<<7) /* Infrared interface enable */
|
|
#define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */
|
|
#define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
|
|
#define UCR1_SNDBRK (1<<4) /* Send break */
|
|
#define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
|
|
#define UCR1_UARTCLKEN (1<<2) /* UART clock enabled */
|
|
#define UCR1_DOZE (1<<1) /* Doze */
|
|
#define UCR1_UARTEN (1<<0) /* UART enabled */
|
|
#define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
|
|
#define UCR2_IRTS (1<<14) /* Ignore RTS pin */
|
|
#define UCR2_CTSC (1<<13) /* CTS pin control */
|
|
#define UCR2_CTS (1<<12) /* Clear to send */
|
|
#define UCR2_ESCEN (1<<11) /* Escape enable */
|
|
#define UCR2_PREN (1<<8) /* Parity enable */
|
|
#define UCR2_PROE (1<<7) /* Parity odd/even */
|
|
#define UCR2_STPB (1<<6) /* Stop */
|
|
#define UCR2_WS (1<<5) /* Word size */
|
|
#define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */
|
|
#define UCR2_TXEN (1<<2) /* Transmitter enabled */
|
|
#define UCR2_RXEN (1<<1) /* Receiver enabled */
|
|
#define UCR2_SRST (1<<0) /* SW reset */
|
|
#define UCR3_DTREN (1<<13) /* DTR interrupt enable */
|
|
#define UCR3_PARERREN (1<<12) /* Parity enable */
|
|
#define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */
|
|
#define UCR3_DSR (1<<10) /* Data set ready */
|
|
#define UCR3_DCD (1<<9) /* Data carrier detect */
|
|
#define UCR3_RI (1<<8) /* Ring indicator */
|
|
#define UCR3_ADNIMP (1<<7) /* Autobaud Detection Not Improved */
|
|
#define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */
|
|
#define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */
|
|
#define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */
|
|
#define UCR3_REF25 (1<<3) /* Ref freq 25 MHz */
|
|
#define UCR3_REF30 (1<<2) /* Ref Freq 30 MHz */
|
|
#define UCR3_INVT (1<<1) /* Inverted Infrared transmission */
|
|
#define UCR3_BPEN (1<<0) /* Preset registers enable */
|
|
#define UCR4_CTSTL_32 (32<<10) /* CTS trigger level (32 chars) */
|
|
#define UCR4_INVR (1<<9) /* Inverted infrared reception */
|
|
#define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */
|
|
#define UCR4_WKEN (1<<7) /* Wake interrupt enable */
|
|
#define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */
|
|
#define UCR4_IRSC (1<<5) /* IR special case */
|
|
#define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */
|
|
#define UCR4_BKEN (1<<2) /* Break condition interrupt enable */
|
|
#define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */
|
|
#define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */
|
|
#define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */
|
|
#define UFCR_RFDIV (7<<7) /* Reference freq divider mask */
|
|
#define UFCR_RFDIV_SHF 7 /* Reference freq divider shift */
|
|
#define RFDIV 4 /* divide input clock by 2 */
|
|
#define UFCR_DCEDTE (1<<6) /* DTE mode select */
|
|
#define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */
|
|
#define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */
|
|
#define USR1_RTSS (1<<14) /* RTS pin status */
|
|
#define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */
|
|
#define USR1_RTSD (1<<12) /* RTS delta */
|
|
#define USR1_ESCF (1<<11) /* Escape seq interrupt flag */
|
|
#define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */
|
|
#define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */
|
|
#define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */
|
|
#define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */
|
|
#define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */
|
|
#define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */
|
|
#define USR2_ADET (1<<15) /* Auto baud rate detect complete */
|
|
#define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */
|
|
#define USR2_DTRF (1<<13) /* DTR edge interrupt flag */
|
|
#define USR2_IDLE (1<<12) /* Idle condition */
|
|
#define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */
|
|
#define USR2_WAKE (1<<7) /* Wake */
|
|
#define USR2_RTSF (1<<4) /* RTS edge interrupt flag */
|
|
#define USR2_TXDC (1<<3) /* Transmitter complete */
|
|
#define USR2_BRCD (1<<2) /* Break condition */
|
|
#define USR2_ORE (1<<1) /* Overrun error */
|
|
#define USR2_RDR (1<<0) /* Recv data ready */
|
|
#define UTS_FRCPERR (1<<13) /* Force parity error */
|
|
#define UTS_LOOP (1<<12) /* Loop tx and rx */
|
|
#define UTS_TXEMPTY (1<<6) /* TxFIFO empty */
|
|
#define UTS_RXEMPTY (1<<5) /* RxFIFO empty */
|
|
#define UTS_TXFULL (1<<4) /* TxFIFO full */
|
|
#define UTS_RXFULL (1<<3) /* RxFIFO full */
|
|
#define UTS_SOFTRS (1<<0) /* Software reset */
|
|
#define TXTL 2 /* reset default */
|
|
#define RXTL 1 /* reset default */
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
struct mxc_uart {
|
|
u32 rxd;
|
|
u32 spare0[15];
|
|
|
|
u32 txd;
|
|
u32 spare1[15];
|
|
|
|
u32 cr1;
|
|
u32 cr2;
|
|
u32 cr3;
|
|
u32 cr4;
|
|
|
|
u32 fcr;
|
|
u32 sr1;
|
|
u32 sr2;
|
|
u32 esc;
|
|
|
|
u32 tim;
|
|
u32 bir;
|
|
u32 bmr;
|
|
u32 brc;
|
|
|
|
u32 onems;
|
|
u32 ts;
|
|
};
|
|
|
|
static void _mxc_serial_init(struct mxc_uart *base)
|
|
{
|
|
writel(0, &base->cr1);
|
|
writel(0, &base->cr2);
|
|
|
|
while (!(readl(&base->cr2) & UCR2_SRST));
|
|
|
|
writel(0x704 | UCR3_ADNIMP, &base->cr3);
|
|
writel(0x8000, &base->cr4);
|
|
writel(0x2b, &base->esc);
|
|
writel(0, &base->tim);
|
|
|
|
writel(0, &base->ts);
|
|
}
|
|
|
|
static void _mxc_serial_setbrg(struct mxc_uart *base, unsigned long clk,
|
|
unsigned long baudrate, bool use_dte)
|
|
{
|
|
u32 tmp;
|
|
|
|
tmp = RFDIV << UFCR_RFDIV_SHF;
|
|
if (use_dte)
|
|
tmp |= UFCR_DCEDTE;
|
|
else
|
|
tmp |= (TXTL << UFCR_TXTL_SHF) | (RXTL << UFCR_RXTL_SHF);
|
|
writel(tmp, &base->fcr);
|
|
|
|
writel(0xf, &base->bir);
|
|
writel(clk / (2 * baudrate), &base->bmr);
|
|
|
|
writel(UCR2_WS | UCR2_IRTS | UCR2_RXEN | UCR2_TXEN | UCR2_SRST,
|
|
&base->cr2);
|
|
writel(UCR1_UARTEN, &base->cr1);
|
|
}
|
|
|
|
#ifndef CONFIG_DM_SERIAL
|
|
|
|
#ifndef CONFIG_MXC_UART_BASE
|
|
#error "define CONFIG_MXC_UART_BASE to use the MXC UART driver"
|
|
#endif
|
|
|
|
#define mxc_base ((struct mxc_uart *)CONFIG_MXC_UART_BASE)
|
|
|
|
static void mxc_serial_setbrg(void)
|
|
{
|
|
u32 clk = imx_get_uartclk();
|
|
|
|
if (!gd->baudrate)
|
|
gd->baudrate = CONFIG_BAUDRATE;
|
|
|
|
_mxc_serial_setbrg(mxc_base, clk, gd->baudrate, false);
|
|
}
|
|
|
|
static int mxc_serial_getc(void)
|
|
{
|
|
while (readl(&mxc_base->ts) & UTS_RXEMPTY)
|
|
WATCHDOG_RESET();
|
|
return (readl(&mxc_base->rxd) & URXD_RX_DATA); /* mask out status from upper word */
|
|
}
|
|
|
|
static void mxc_serial_putc(const char c)
|
|
{
|
|
/* If \n, also do \r */
|
|
if (c == '\n')
|
|
serial_putc('\r');
|
|
|
|
writel(c, &mxc_base->txd);
|
|
|
|
/* wait for transmitter to be ready */
|
|
while (!(readl(&mxc_base->ts) & UTS_TXEMPTY))
|
|
WATCHDOG_RESET();
|
|
}
|
|
|
|
/* Test whether a character is in the RX buffer */
|
|
static int mxc_serial_tstc(void)
|
|
{
|
|
/* If receive fifo is empty, return false */
|
|
if (readl(&mxc_base->ts) & UTS_RXEMPTY)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Initialise the serial port with the given baudrate. The settings
|
|
* are always 8 data bits, no parity, 1 stop bit, no start bits.
|
|
*/
|
|
static int mxc_serial_init(void)
|
|
{
|
|
_mxc_serial_init(mxc_base);
|
|
|
|
serial_setbrg();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct serial_device mxc_serial_drv = {
|
|
.name = "mxc_serial",
|
|
.start = mxc_serial_init,
|
|
.stop = NULL,
|
|
.setbrg = mxc_serial_setbrg,
|
|
.putc = mxc_serial_putc,
|
|
.puts = default_serial_puts,
|
|
.getc = mxc_serial_getc,
|
|
.tstc = mxc_serial_tstc,
|
|
};
|
|
|
|
void mxc_serial_initialize(void)
|
|
{
|
|
serial_register(&mxc_serial_drv);
|
|
}
|
|
|
|
__weak struct serial_device *default_serial_console(void)
|
|
{
|
|
return &mxc_serial_drv;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_DM_SERIAL
|
|
|
|
int mxc_serial_setbrg(struct udevice *dev, int baudrate)
|
|
{
|
|
struct mxc_serial_platdata *plat = dev->platdata;
|
|
u32 clk = imx_get_uartclk();
|
|
|
|
_mxc_serial_setbrg(plat->reg, clk, baudrate, plat->use_dte);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mxc_serial_probe(struct udevice *dev)
|
|
{
|
|
struct mxc_serial_platdata *plat = dev->platdata;
|
|
|
|
_mxc_serial_init(plat->reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mxc_serial_getc(struct udevice *dev)
|
|
{
|
|
struct mxc_serial_platdata *plat = dev->platdata;
|
|
struct mxc_uart *const uart = plat->reg;
|
|
|
|
if (readl(&uart->ts) & UTS_RXEMPTY)
|
|
return -EAGAIN;
|
|
|
|
return readl(&uart->rxd) & URXD_RX_DATA;
|
|
}
|
|
|
|
static int mxc_serial_putc(struct udevice *dev, const char ch)
|
|
{
|
|
struct mxc_serial_platdata *plat = dev->platdata;
|
|
struct mxc_uart *const uart = plat->reg;
|
|
|
|
if (!(readl(&uart->ts) & UTS_TXEMPTY))
|
|
return -EAGAIN;
|
|
|
|
writel(ch, &uart->txd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mxc_serial_pending(struct udevice *dev, bool input)
|
|
{
|
|
struct mxc_serial_platdata *plat = dev->platdata;
|
|
struct mxc_uart *const uart = plat->reg;
|
|
uint32_t sr2 = readl(&uart->sr2);
|
|
|
|
if (input)
|
|
return sr2 & USR2_RDR ? 1 : 0;
|
|
else
|
|
return sr2 & USR2_TXDC ? 0 : 1;
|
|
}
|
|
|
|
static const struct dm_serial_ops mxc_serial_ops = {
|
|
.putc = mxc_serial_putc,
|
|
.pending = mxc_serial_pending,
|
|
.getc = mxc_serial_getc,
|
|
.setbrg = mxc_serial_setbrg,
|
|
};
|
|
|
|
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
|
static int mxc_serial_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct mxc_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 mxc_uart *)addr;
|
|
|
|
plat->use_dte = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
|
|
"fsl,dte-mode");
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id mxc_serial_ids[] = {
|
|
{ .compatible = "fsl,imx6ul-uart" },
|
|
{ .compatible = "fsl,imx7d-uart" },
|
|
{ }
|
|
};
|
|
#endif
|
|
|
|
U_BOOT_DRIVER(serial_mxc) = {
|
|
.name = "serial_mxc",
|
|
.id = UCLASS_SERIAL,
|
|
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
|
.of_match = mxc_serial_ids,
|
|
.ofdata_to_platdata = mxc_serial_ofdata_to_platdata,
|
|
.platdata_auto_alloc_size = sizeof(struct mxc_serial_platdata),
|
|
#endif
|
|
.probe = mxc_serial_probe,
|
|
.ops = &mxc_serial_ops,
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_UART_MXC
|
|
#include <debug_uart.h>
|
|
|
|
static inline void _debug_uart_init(void)
|
|
{
|
|
struct mxc_uart *base = (struct mxc_uart *)CONFIG_DEBUG_UART_BASE;
|
|
|
|
_mxc_serial_init(base);
|
|
_mxc_serial_setbrg(base, CONFIG_DEBUG_UART_CLOCK,
|
|
CONFIG_BAUDRATE, false);
|
|
}
|
|
|
|
static inline void _debug_uart_putc(int ch)
|
|
{
|
|
struct mxc_uart *base = (struct mxc_uart *)CONFIG_DEBUG_UART_BASE;
|
|
|
|
while (!(readl(&base->ts) & UTS_TXEMPTY))
|
|
WATCHDOG_RESET();
|
|
|
|
writel(ch, &base->txd);
|
|
}
|
|
|
|
DEBUG_UART_FUNCS
|
|
|
|
#endif
|