[people/ms/u-boot.git] / drivers / serial / serial_mxc.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  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_SOFTRST	 (1<<0)	 /* Software reset */

#ifndef CONFIG_DM_SERIAL

#ifndef CONFIG_MXC_UART_BASE
#error "define CONFIG_MXC_UART_BASE to use the MXC UART driver"
#endif

#define UART_PHYS	CONFIG_MXC_UART_BASE

#define __REG(x)     (*((volatile u32 *)(x)))

/* Register definitions */
#define URXD  0x0  /* Receiver Register */
#define UTXD  0x40 /* Transmitter Register */
#define UCR1  0x80 /* Control Register 1 */
#define UCR2  0x84 /* Control Register 2 */
#define UCR3  0x88 /* Control Register 3 */
#define UCR4  0x8c /* Control Register 4 */
#define UFCR  0x90 /* FIFO Control Register */
#define USR1  0x94 /* Status Register 1 */
#define USR2  0x98 /* Status Register 2 */
#define UESC  0x9c /* Escape Character Register */
#define UTIM  0xa0 /* Escape Timer Register */
#define UBIR  0xa4 /* BRM Incremental Register */
#define UBMR  0xa8 /* BRM Modulator Register */
#define UBRC  0xac /* Baud Rate Count Register */
#define UTS   0xb4 /* UART Test Register (mx31) */

DECLARE_GLOBAL_DATA_PTR;

#define TXTL  2 /* reset default */
#define RXTL  1 /* reset default */
#define RFDIV 4 /* divide input clock by 2 */

static void mxc_serial_setbrg(void)
{
	u32 clk = imx_get_uartclk();

	if (!gd->baudrate)
		gd->baudrate = CONFIG_BAUDRATE;

	__REG(UART_PHYS + UFCR) = (RFDIV << UFCR_RFDIV_SHF)
		| (TXTL << UFCR_TXTL_SHF)
		| (RXTL << UFCR_RXTL_SHF);
	__REG(UART_PHYS + UBIR) = 0xf;
	__REG(UART_PHYS + UBMR) = clk / (2 * gd->baudrate);

}

static int mxc_serial_getc(void)
{
	while (__REG(UART_PHYS + UTS) & UTS_RXEMPTY)
		WATCHDOG_RESET();
	return (__REG(UART_PHYS + URXD) & URXD_RX_DATA); /* mask out status from upper word */
}

static void mxc_serial_putc(const char c)
{
	__REG(UART_PHYS + UTXD) = c;

	/* wait for transmitter to be ready */
	while (!(__REG(UART_PHYS + UTS) & UTS_TXEMPTY))
		WATCHDOG_RESET();

	/* If \n, also do \r */
	if (c == '\n')
		serial_putc ('\r');
}

/*
 * Test whether a character is in the RX buffer
 */
static int mxc_serial_tstc(void)
{
	/* If receive fifo is empty, return false */
	if (__REG(UART_PHYS + UTS) & 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)
{
	__REG(UART_PHYS + UCR1) = 0x0;
	__REG(UART_PHYS + UCR2) = 0x0;

	while (!(__REG(UART_PHYS + UCR2) & UCR2_SRST));

	__REG(UART_PHYS + UCR3) = 0x0704 | UCR3_ADNIMP;
	__REG(UART_PHYS + UCR4) = 0x8000;
	__REG(UART_PHYS + UESC) = 0x002b;
	__REG(UART_PHYS + UTIM) = 0x0;

	__REG(UART_PHYS + UTS) = 0x0;

	serial_setbrg();

	__REG(UART_PHYS + UCR2) = UCR2_WS | UCR2_IRTS | UCR2_RXEN | UCR2_TXEN | UCR2_SRST;

	__REG(UART_PHYS + UCR1) = UCR1_UARTEN;

	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

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;
};

int mxc_serial_setbrg(struct udevice *dev, int baudrate)
{
	struct mxc_serial_platdata *plat = dev->platdata;
	struct mxc_uart *const uart = plat->reg;
	u32 clk = imx_get_uartclk();

	writel(4 << 7, &uart->fcr); /* divide input clock by 2 */
	writel(0xf, &uart->bir);
	writel(clk / (2 * baudrate), &uart->bmr);

	writel(UCR2_WS | UCR2_IRTS | UCR2_RXEN | UCR2_TXEN | UCR2_SRST,
	       &uart->cr2);
	writel(UCR1_UARTEN, &uart->cr1);

	return 0;
}

static int mxc_serial_probe(struct udevice *dev)
{
	struct mxc_serial_platdata *plat = dev->platdata;
	struct mxc_uart *const uart = plat->reg;

	writel(0, &uart->cr1);
	writel(0, &uart->cr2);
	while (!(readl(&uart->cr2) & UCR2_SRST));
	writel(0x704 | UCR3_ADNIMP, &uart->cr3);
	writel(0x8000, &uart->cr4);
	writel(0x2b, &uart->esc);
	writel(0, &uart->tim);
	writel(0, &uart->ts);

	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,
};

U_BOOT_DRIVER(serial_mxc) = {
	.name	= "serial_mxc",
	.id	= UCLASS_SERIAL,
	.probe = mxc_serial_probe,
	.ops	= &mxc_serial_ops,
	.flags = DM_FLAG_PRE_RELOC,
};
#endif
Commit	Line	Data
9b56f4f0 SH	1	/*
	2	* (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>
	3	*
1a459660	4	* SPDX-License-Identifier: GPL-2.0+
9b56f4f0 SH	5	*/
	6
	7	#include <common.h>
a8ba569c SG	8	#include <dm.h>
a8ba569c SG	9	#include <errno.h>
4ec3d2a7	10	#include <watchdog.h>
47d19da4 IY	11	#include <asm/arch/imx-regs.h>
47d19da4 IY	12	#include <asm/arch/clock.h>
86256b79	13	#include <dm/platform_data/serial_mxc.h>
a943472c MV	14	#include <serial.h>
a943472c MV	15	#include <linux/compiler.h>
9b56f4f0	16
9b56f4f0 SH	17	/* UART Control Register Bit Fields.*/
	18	#define URXD_CHARRDY (1<<15)
	19	#define URXD_ERR (1<<14)
	20	#define URXD_OVRRUN (1<<13)
	21	#define URXD_FRMERR (1<<12)
	22	#define URXD_BRK (1<<11)
	23	#define URXD_PRERR (1<<10)
d92ea21b	24	#define URXD_RX_DATA (0xFF)
9b56f4f0 SH	25	#define UCR1_ADEN (1<<15) /* Auto dectect interrupt */
	26	#define UCR1_ADBR (1<<14) /* Auto detect baud rate */
	27	#define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */
	28	#define UCR1_IDEN (1<<12) /* Idle condition interrupt */
	29	#define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */
	30	#define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */
	31	#define UCR1_IREN (1<<7) /* Infrared interface enable */
	32	#define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */
	33	#define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
	34	#define UCR1_SNDBRK (1<<4) /* Send break */
	35	#define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
	36	#define UCR1_UARTCLKEN (1<<2) /* UART clock enabled */
	37	#define UCR1_DOZE (1<<1) /* Doze */
	38	#define UCR1_UARTEN (1<<0) /* UART enabled */
53677ef1 WD	39	#define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
	40	#define UCR2_IRTS (1<<14) /* Ignore RTS pin */
	41	#define UCR2_CTSC (1<<13) /* CTS pin control */
9b56f4f0 SH	42	#define UCR2_CTS (1<<12) /* Clear to send */
	43	#define UCR2_ESCEN (1<<11) /* Escape enable */
	44	#define UCR2_PREN (1<<8) /* Parity enable */
	45	#define UCR2_PROE (1<<7) /* Parity odd/even */
	46	#define UCR2_STPB (1<<6) /* Stop */
	47	#define UCR2_WS (1<<5) /* Word size */
	48	#define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */
	49	#define UCR2_TXEN (1<<2) /* Transmitter enabled */
	50	#define UCR2_RXEN (1<<1) /* Receiver enabled */
53677ef1 WD	51	#define UCR2_SRST (1<<0) /* SW reset */
53677ef1 WD	52	#define UCR3_DTREN (1<<13) /* DTR interrupt enable */
9b56f4f0 SH	53	#define UCR3_PARERREN (1<<12) /* Parity enable */
	54	#define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */
	55	#define UCR3_DSR (1<<10) /* Data set ready */
	56	#define UCR3_DCD (1<<9) /* Data carrier detect */
	57	#define UCR3_RI (1<<8) /* Ring indicator */
3a564825	58	#define UCR3_ADNIMP (1<<7) /* Autobaud Detection Not Improved */
9b56f4f0 SH	59	#define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */
	60	#define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */
	61	#define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */
53677ef1 WD	62	#define UCR3_REF25 (1<<3) /* Ref freq 25 MHz */
	63	#define UCR3_REF30 (1<<2) /* Ref Freq 30 MHz */
	64	#define UCR3_INVT (1<<1) /* Inverted Infrared transmission */
	65	#define UCR3_BPEN (1<<0) /* Preset registers enable */
9b56f4f0	66	#define UCR4_CTSTL_32 (32<<10) /* CTS trigger level (32 chars) */
53677ef1 WD	67	#define UCR4_INVR (1<<9) /* Inverted infrared reception */
	68	#define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */
	69	#define UCR4_WKEN (1<<7) /* Wake interrupt enable */
	70	#define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */
	71	#define UCR4_IRSC (1<<5) /* IR special case */
	72	#define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */
	73	#define UCR4_BKEN (1<<2) /* Break condition interrupt enable */
	74	#define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */
	75	#define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */
9b56f4f0 SH	76	#define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */
9b56f4f0 SH	77	#define UFCR_RFDIV (7<<7) /* Reference freq divider mask */
434afa80	78	#define UFCR_RFDIV_SHF 7 /* Reference freq divider shift */
9b56f4f0 SH	79	#define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */
9b56f4f0 SH	80	#define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */
53677ef1 WD	81	#define USR1_RTSS (1<<14) /* RTS pin status */
	82	#define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */
	83	#define USR1_RTSD (1<<12) /* RTS delta */
	84	#define USR1_ESCF (1<<11) /* Escape seq interrupt flag */
9b56f4f0 SH	85	#define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */
	86	#define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */
	87	#define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */
53677ef1	88	#define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */
9b56f4f0	89	#define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */
53677ef1 WD	90	#define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */
	91	#define USR2_ADET (1<<15) /* Auto baud rate detect complete */
	92	#define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */
	93	#define USR2_DTRF (1<<13) /* DTR edge interrupt flag */
	94	#define USR2_IDLE (1<<12) /* Idle condition */
	95	#define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */
	96	#define USR2_WAKE (1<<7) /* Wake */
	97	#define USR2_RTSF (1<<4) /* RTS edge interrupt flag */
	98	#define USR2_TXDC (1<<3) /* Transmitter complete */
	99	#define USR2_BRCD (1<<2) /* Break condition */
9b56f4f0 SH	100	#define USR2_ORE (1<<1) /* Overrun error */
	101	#define USR2_RDR (1<<0) /* Recv data ready */
	102	#define UTS_FRCPERR (1<<13) /* Force parity error */
	103	#define UTS_LOOP (1<<12) /* Loop tx and rx */
	104	#define UTS_TXEMPTY (1<<6) /* TxFIFO empty */
	105	#define UTS_RXEMPTY (1<<5) /* RxFIFO empty */
53677ef1 WD	106	#define UTS_TXFULL (1<<4) /* TxFIFO full */
53677ef1 WD	107	#define UTS_RXFULL (1<<3) /* RxFIFO full */
9b56f4f0 SH	108	#define UTS_SOFTRST (1<<0) /* Software reset */
9b56f4f0 SH	109
a8ba569c SG	110	#ifndef CONFIG_DM_SERIAL
	111
	112	#ifndef CONFIG_MXC_UART_BASE
	113	#error "define CONFIG_MXC_UART_BASE to use the MXC UART driver"
	114	#endif
	115
	116	#define UART_PHYS CONFIG_MXC_UART_BASE
	117
	118	#define __REG(x) (((volatile u32 )(x)))
	119
	120	/* Register definitions */
	121	#define URXD 0x0 /* Receiver Register */
	122	#define UTXD 0x40 /* Transmitter Register */
	123	#define UCR1 0x80 /* Control Register 1 */
	124	#define UCR2 0x84 /* Control Register 2 */
	125	#define UCR3 0x88 /* Control Register 3 */
	126	#define UCR4 0x8c /* Control Register 4 */
	127	#define UFCR 0x90 /* FIFO Control Register */
	128	#define USR1 0x94 /* Status Register 1 */
	129	#define USR2 0x98 /* Status Register 2 */
	130	#define UESC 0x9c /* Escape Character Register */
	131	#define UTIM 0xa0 /* Escape Timer Register */
	132	#define UBIR 0xa4 /* BRM Incremental Register */
	133	#define UBMR 0xa8 /* BRM Modulator Register */
	134	#define UBRC 0xac /* Baud Rate Count Register */
	135	#define UTS 0xb4 /* UART Test Register (mx31) */
	136
9b56f4f0 SH	137	DECLARE_GLOBAL_DATA_PTR;
9b56f4f0 SH	138
434afa80 MS	139	#define TXTL 2 /* reset default */
	140	#define RXTL 1 /* reset default */
	141	#define RFDIV 4 /* divide input clock by 2 */
	142
a943472c	143	static void mxc_serial_setbrg(void)
9b56f4f0	144	{
71d64c0e	145	u32 clk = imx_get_uartclk();
9b56f4f0 SH	146
	147	if (!gd->baudrate)
	148	gd->baudrate = CONFIG_BAUDRATE;
	149
434afa80 MS	150	__REG(UART_PHYS + UFCR) = (RFDIV << UFCR_RFDIV_SHF)
	151	\| (TXTL << UFCR_TXTL_SHF)
	152	\| (RXTL << UFCR_RXTL_SHF);
9b56f4f0 SH	153	__REG(UART_PHYS + UBIR) = 0xf;
	154	__REG(UART_PHYS + UBMR) = clk / (2 * gd->baudrate);
	155
	156	}
	157
a943472c	158	static int mxc_serial_getc(void)
9b56f4f0	159	{
4ec3d2a7 SB	160	while (__REG(UART_PHYS + UTS) & UTS_RXEMPTY)
4ec3d2a7 SB	161	WATCHDOG_RESET();
d92ea21b	162	return (__REG(UART_PHYS + URXD) & URXD_RX_DATA); /* mask out status from upper word */
9b56f4f0 SH	163	}
9b56f4f0 SH	164
a943472c	165	static void mxc_serial_putc(const char c)
9b56f4f0 SH	166	{
	167	__REG(UART_PHYS + UTXD) = c;
	168
	169	/* wait for transmitter to be ready */
4ec3d2a7 SB	170	while (!(__REG(UART_PHYS + UTS) & UTS_TXEMPTY))
4ec3d2a7 SB	171	WATCHDOG_RESET();
9b56f4f0 SH	172
	173	/* If \n, also do \r */
	174	if (c == '\n')
	175	serial_putc ('\r');
	176	}
	177
	178	/*
	179	* Test whether a character is in the RX buffer
	180	*/
a943472c	181	static int mxc_serial_tstc(void)
9b56f4f0 SH	182	{
	183	/* If receive fifo is empty, return false */
	184	if (__REG(UART_PHYS + UTS) & UTS_RXEMPTY)
	185	return 0;
	186	return 1;
	187	}
	188
9b56f4f0 SH	189	/*
	190	* Initialise the serial port with the given baudrate. The settings
	191	* are always 8 data bits, no parity, 1 stop bit, no start bits.
	192	*
	193	*/
a943472c	194	static int mxc_serial_init(void)
9b56f4f0 SH	195	{
	196	__REG(UART_PHYS + UCR1) = 0x0;
	197	__REG(UART_PHYS + UCR2) = 0x0;
	198
	199	while (!(__REG(UART_PHYS + UCR2) & UCR2_SRST));
	200
3a564825	201	__REG(UART_PHYS + UCR3) = 0x0704 \| UCR3_ADNIMP;
9b56f4f0 SH	202	__REG(UART_PHYS + UCR4) = 0x8000;
	203	__REG(UART_PHYS + UESC) = 0x002b;
	204	__REG(UART_PHYS + UTIM) = 0x0;
	205
	206	__REG(UART_PHYS + UTS) = 0x0;
	207
	208	serial_setbrg();
	209
	210	__REG(UART_PHYS + UCR2) = UCR2_WS \| UCR2_IRTS \| UCR2_RXEN \| UCR2_TXEN \| UCR2_SRST;
	211
	212	__REG(UART_PHYS + UCR1) = UCR1_UARTEN;
	213
	214	return 0;
	215	}
a943472c	216
a943472c MV	217	static struct serial_device mxc_serial_drv = {
	218	.name = "mxc_serial",
	219	.start = mxc_serial_init,
	220	.stop = NULL,
	221	.setbrg = mxc_serial_setbrg,
	222	.putc = mxc_serial_putc,
ec3fd689	223	.puts = default_serial_puts,
a943472c MV	224	.getc = mxc_serial_getc,
	225	.tstc = mxc_serial_tstc,
	226	};
	227
	228	void mxc_serial_initialize(void)
	229	{
	230	serial_register(&mxc_serial_drv);
	231	}
	232
	233	__weak struct serial_device *default_serial_console(void)
	234	{
	235	return &mxc_serial_drv;
	236	}
a8ba569c SG	237	#endif
	238
	239	#ifdef CONFIG_DM_SERIAL
	240
	241	struct mxc_uart {
	242	u32 rxd;
	243	u32 spare0[15];
	244
	245	u32 txd;
	246	u32 spare1[15];
	247
	248	u32 cr1;
	249	u32 cr2;
	250	u32 cr3;
	251	u32 cr4;
	252
	253	u32 fcr;
	254	u32 sr1;
	255	u32 sr2;
	256	u32 esc;
	257
	258	u32 tim;
	259	u32 bir;
	260	u32 bmr;
	261	u32 brc;
	262
	263	u32 onems;
	264	u32 ts;
	265	};
	266
	267	int mxc_serial_setbrg(struct udevice *dev, int baudrate)
	268	{
	269	struct mxc_serial_platdata *plat = dev->platdata;
	270	struct mxc_uart *const uart = plat->reg;
	271	u32 clk = imx_get_uartclk();
	272
	273	writel(4 << 7, &uart->fcr); /* divide input clock by 2 */
	274	writel(0xf, &uart->bir);
	275	writel(clk / (2 * baudrate), &uart->bmr);
	276
	277	writel(UCR2_WS \| UCR2_IRTS \| UCR2_RXEN \| UCR2_TXEN \| UCR2_SRST,
	278	&uart->cr2);
	279	writel(UCR1_UARTEN, &uart->cr1);
	280
	281	return 0;
	282	}
	283
	284	static int mxc_serial_probe(struct udevice *dev)
	285	{
	286	struct mxc_serial_platdata *plat = dev->platdata;
	287	struct mxc_uart *const uart = plat->reg;
	288
	289	writel(0, &uart->cr1);
	290	writel(0, &uart->cr2);
	291	while (!(readl(&uart->cr2) & UCR2_SRST));
	292	writel(0x704 \| UCR3_ADNIMP, &uart->cr3);
	293	writel(0x8000, &uart->cr4);
	294	writel(0x2b, &uart->esc);
	295	writel(0, &uart->tim);
	296	writel(0, &uart->ts);
	297
	298	return 0;
	299	}
	300
301	static int mxc_serial_getc(struct udevice *dev)
302	{
303	struct mxc_serial_platdata *plat = dev->platdata;
304	struct mxc_uart *const uart = plat->reg;
305
306	if (readl(&uart->ts) & UTS_RXEMPTY)
307	return -EAGAIN;
308
309	return readl(&uart->rxd) & URXD_RX_DATA;
310	}
311
312	static int mxc_serial_putc(struct udevice *dev, const char ch)
313	{
314	struct mxc_serial_platdata *plat = dev->platdata;
315	struct mxc_uart *const uart = plat->reg;
316
317	if (!(readl(&uart->ts) & UTS_TXEMPTY))
318	return -EAGAIN;
319
320	writel(ch, &uart->txd);
321
322	return 0;
323	}
324
325	static int mxc_serial_pending(struct udevice *dev, bool input)
326	{
327	struct mxc_serial_platdata *plat = dev->platdata;
328	struct mxc_uart *const uart = plat->reg;
329	uint32_t sr2 = readl(&uart->sr2);
330
331	if (input)
332	return sr2 & USR2_RDR ? 1 : 0;
333	else
334	return sr2 & USR2_TXDC ? 0 : 1;
335	}
336
337	static const struct dm_serial_ops mxc_serial_ops = {
338	.putc = mxc_serial_putc,
339	.pending = mxc_serial_pending,
340	.getc = mxc_serial_getc,
341	.setbrg = mxc_serial_setbrg,
342	};
343
344	U_BOOT_DRIVER(serial_mxc) = {
345	.name = "serial_mxc",
346	.id = UCLASS_SERIAL,
347	.probe = mxc_serial_probe,
348	.ops = &mxc_serial_ops,
349	.flags = DM_FLAG_PRE_RELOC,
350	};
351	#endif