[u-boot.git] / drivers / serial / serial_linflexuart.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2013-2016 Freescale Semiconductor, Inc.
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <watchdog.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <serial.h>
#include <linux/compiler.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>

#define US1_TDRE            (1 << 7)
#define US1_RDRF            (1 << 5)
#define UC2_TE              (1 << 3)
#define LINCR1_INIT         (1 << 0)
#define LINCR1_MME          (1 << 4)
#define LINCR1_BF           (1 << 7)
#define LINSR_LINS_INITMODE (0x00001000)
#define LINSR_LINS_MASK     (0x0000F000)
#define UARTCR_UART         (1 << 0)
#define UARTCR_WL0          (1 << 1)
#define UARTCR_PCE          (1 << 2)
#define UARTCR_PC0          (1 << 3)
#define UARTCR_TXEN         (1 << 4)
#define UARTCR_RXEN         (1 << 5)
#define UARTCR_PC1          (1 << 6)
#define UARTSR_DTF          (1 << 1)
#define UARTSR_DRF          (1 << 2)
#define UARTSR_RMB          (1 << 9)

DECLARE_GLOBAL_DATA_PTR;

static void _linflex_serial_setbrg(struct linflex_fsl *base, int baudrate)
{
	u32 clk = mxc_get_clock(MXC_UART_CLK);
	u32 ibr, fbr;

	if (!baudrate)
		baudrate = CONFIG_BAUDRATE;

	ibr = (u32) (clk / (16 * gd->baudrate));
	fbr = (u32) (clk % (16 * gd->baudrate)) * 16;

	__raw_writel(ibr, &base->linibrr);
	__raw_writel(fbr, &base->linfbrr);
}

static int _linflex_serial_getc(struct linflex_fsl *base)
{
	char c;

	if (!(__raw_readb(&base->uartsr) & UARTSR_DRF))
		return -EAGAIN;

	if (!(__raw_readl(&base->uartsr) & UARTSR_RMB))
		return -EAGAIN;

	c = __raw_readl(&base->bdrm);
	__raw_writeb((__raw_readb(&base->uartsr) | (UARTSR_DRF | UARTSR_RMB)),
		     &base->uartsr);
	return c;
}

static int _linflex_serial_putc(struct linflex_fsl *base, const char c)
{
	__raw_writeb(c, &base->bdrl);


	if (!(__raw_readb(&base->uartsr) & UARTSR_DTF))
		return -EAGAIN;

	__raw_writeb((__raw_readb(&base->uartsr) | UARTSR_DTF), &base->uartsr);

	return 0;
}

/*
 * 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 _linflex_serial_init(struct linflex_fsl *base)
{
	volatile u32 ctrl;

	/* set the Linflex in master mode amd activate by-pass filter */
	ctrl = LINCR1_BF | LINCR1_MME;
	__raw_writel(ctrl, &base->lincr1);

	/* init mode */
	ctrl |= LINCR1_INIT;
	__raw_writel(ctrl, &base->lincr1);

	/* waiting for init mode entry - TODO: add a timeout */
	while ((__raw_readl(&base->linsr) & LINSR_LINS_MASK) !=
	       LINSR_LINS_INITMODE);

	/* set UART bit to allow writing other bits */
	__raw_writel(UARTCR_UART, &base->uartcr);

	/* provide data bits, parity, stop bit, etc */
	serial_setbrg();

	/* 8 bit data, no parity, Tx and Rx enabled, UART mode */
	__raw_writel(UARTCR_PC1 | UARTCR_RXEN | UARTCR_TXEN | UARTCR_PC0
		     | UARTCR_WL0 | UARTCR_UART, &base->uartcr);

	ctrl = __raw_readl(&base->lincr1);
	ctrl &= ~LINCR1_INIT;
	__raw_writel(ctrl, &base->lincr1);	/* end init mode */

	return 0;
}

struct linflex_serial_plat {
	struct linflex_fsl *base_addr;
	u8 port_id; /* do we need this? */
};

struct linflex_serial_priv {
	struct linflex_fsl *lfuart;
};

int linflex_serial_setbrg(struct udevice *dev, int baudrate)
{
	struct linflex_serial_priv *priv = dev_get_priv(dev);

	_linflex_serial_setbrg(priv->lfuart, baudrate);

	return 0;
}

static int linflex_serial_getc(struct udevice *dev)
{
	struct linflex_serial_priv *priv = dev_get_priv(dev);

	return _linflex_serial_getc(priv->lfuart);
}

static int linflex_serial_putc(struct udevice *dev, const char ch)
{

	struct linflex_serial_priv *priv = dev_get_priv(dev);

	return _linflex_serial_putc(priv->lfuart, ch);
}

static int linflex_serial_pending(struct udevice *dev, bool input)
{
	struct linflex_serial_priv *priv = dev_get_priv(dev);
	uint32_t uartsr = __raw_readl(&priv->lfuart->uartsr);

	if (input)
		return ((uartsr & UARTSR_DRF) && (uartsr & UARTSR_RMB)) ? 1 : 0;
	else
		return uartsr & UARTSR_DTF ? 0 : 1;
}

static void linflex_serial_init_internal(struct linflex_fsl *lfuart)
{
	_linflex_serial_init(lfuart);
	_linflex_serial_setbrg(lfuart, CONFIG_BAUDRATE);
	return;
}

static int linflex_serial_probe(struct udevice *dev)
{
	struct linflex_serial_plat *plat = dev_get_plat(dev);
	struct linflex_serial_priv *priv = dev_get_priv(dev);

	priv->lfuart = (struct linflex_fsl *)plat->base_addr;
	linflex_serial_init_internal(priv->lfuart);

	return 0;
}

static const struct dm_serial_ops linflex_serial_ops = {
	.putc = linflex_serial_putc,
	.pending = linflex_serial_pending,
	.getc = linflex_serial_getc,
	.setbrg = linflex_serial_setbrg,
};

U_BOOT_DRIVER(serial_linflex) = {
	.name	= "serial_linflex",
	.id	= UCLASS_SERIAL,
	.probe = linflex_serial_probe,
	.ops	= &linflex_serial_ops,
	.flags = DM_FLAG_PRE_RELOC,
	.priv_auto	= sizeof(struct linflex_serial_priv),
};

#ifdef CONFIG_DEBUG_UART_LINFLEXUART

#include <debug_uart.h>


static inline void _debug_uart_init(void)
{
	struct linflex_fsl *base = (struct linflex_fsl *)CONFIG_DEBUG_UART_BASE;

	linflex_serial_init_internal(base);
}

static inline void _debug_uart_putc(int ch)
{
	struct linflex_fsl *base = (struct linflex_fsl *)CONFIG_DEBUG_UART_BASE;

	/* XXX: Is this OK? Should this use the non-DM version? */
	_linflex_serial_putc(base, ch);
}

DEBUG_UART_FUNCS

#endif /* CONFIG_DEBUG_UART_LINFLEXUART */
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
1f68dbc8 SCS	2	/*
1f68dbc8 SCS	3	* (C) Copyright 2013-2016 Freescale Semiconductor, Inc.
1f68dbc8 SCS	4	*/
	5
	6	#include <common.h>
	7	#include <dm.h>
	8	#include <errno.h>
	9	#include <watchdog.h>
401d1c4f	10	#include <asm/global_data.h>
1f68dbc8 SCS	11	#include <asm/io.h>
	12	#include <serial.h>
	13	#include <linux/compiler.h>
	14	#include <asm/arch/imx-regs.h>
	15	#include <asm/arch/clock.h>
	16
	17	#define US1_TDRE (1 << 7)
	18	#define US1_RDRF (1 << 5)
	19	#define UC2_TE (1 << 3)
	20	#define LINCR1_INIT (1 << 0)
	21	#define LINCR1_MME (1 << 4)
	22	#define LINCR1_BF (1 << 7)
	23	#define LINSR_LINS_INITMODE (0x00001000)
	24	#define LINSR_LINS_MASK (0x0000F000)
	25	#define UARTCR_UART (1 << 0)
	26	#define UARTCR_WL0 (1 << 1)
	27	#define UARTCR_PCE (1 << 2)
	28	#define UARTCR_PC0 (1 << 3)
	29	#define UARTCR_TXEN (1 << 4)
	30	#define UARTCR_RXEN (1 << 5)
	31	#define UARTCR_PC1 (1 << 6)
	32	#define UARTSR_DTF (1 << 1)
	33	#define UARTSR_DRF (1 << 2)
	34	#define UARTSR_RMB (1 << 9)
	35
	36	DECLARE_GLOBAL_DATA_PTR;
	37
1f68dbc8 SCS	38	static void _linflex_serial_setbrg(struct linflex_fsl *base, int baudrate)
	39	{
	40	u32 clk = mxc_get_clock(MXC_UART_CLK);
	41	u32 ibr, fbr;
	42
	43	if (!baudrate)
	44	baudrate = CONFIG_BAUDRATE;
	45
	46	ibr = (u32) (clk / (16 * gd->baudrate));
	47	fbr = (u32) (clk % (16 * gd->baudrate)) * 16;
	48
	49	__raw_writel(ibr, &base->linibrr);
	50	__raw_writel(fbr, &base->linfbrr);
	51	}
	52
	53	static int _linflex_serial_getc(struct linflex_fsl *base)
	54	{
	55	char c;
	56
	57	if (!(__raw_readb(&base->uartsr) & UARTSR_DRF))
	58	return -EAGAIN;
	59
	60	if (!(__raw_readl(&base->uartsr) & UARTSR_RMB))
	61	return -EAGAIN;
	62
	63	c = __raw_readl(&base->bdrm);
	64	__raw_writeb((__raw_readb(&base->uartsr) \| (UARTSR_DRF \| UARTSR_RMB)),
	65	&base->uartsr);
	66	return c;
	67	}
	68
	69	static int _linflex_serial_putc(struct linflex_fsl *base, const char c)
	70	{
	71	__raw_writeb(c, &base->bdrl);
	72
	73
	74	if (!(__raw_readb(&base->uartsr) & UARTSR_DTF))
	75	return -EAGAIN;
	76
	77	__raw_writeb((__raw_readb(&base->uartsr) \| UARTSR_DTF), &base->uartsr);
	78
	79	return 0;
	80	}
	81
	82	/*
	83	* Initialise the serial port with the given baudrate. The settings
	84	* are always 8 data bits, no parity, 1 stop bit, no start bits.
	85	*/
	86	static int _linflex_serial_init(struct linflex_fsl *base)
	87	{
	88	volatile u32 ctrl;
	89
	90	/* set the Linflex in master mode amd activate by-pass filter */
	91	ctrl = LINCR1_BF \| LINCR1_MME;
	92	__raw_writel(ctrl, &base->lincr1);
	93
	94	/* init mode */
	95	ctrl \|= LINCR1_INIT;
	96	__raw_writel(ctrl, &base->lincr1);
	97
	98	/* waiting for init mode entry - TODO: add a timeout */
	99	while ((__raw_readl(&base->linsr) & LINSR_LINS_MASK) !=
	100	LINSR_LINS_INITMODE);
	101
102	/* set UART bit to allow writing other bits */
103	__raw_writel(UARTCR_UART, &base->uartcr);
104
105	/* provide data bits, parity, stop bit, etc */
106	serial_setbrg();
107
108	/* 8 bit data, no parity, Tx and Rx enabled, UART mode */
109	__raw_writel(UARTCR_PC1 \| UARTCR_RXEN \| UARTCR_TXEN \| UARTCR_PC0
110	\| UARTCR_WL0 \| UARTCR_UART, &base->uartcr);
111
112	ctrl = __raw_readl(&base->lincr1);
113	ctrl &= ~LINCR1_INIT;
114	__raw_writel(ctrl, &base->lincr1); /* end init mode */
115
116	return 0;
117	}
118
8a8d24bd	119	struct linflex_serial_plat {
1f68dbc8 SCS	120	struct linflex_fsl *base_addr;
	121	u8 port_id; /* do we need this? */
	122	};
	123
	124	struct linflex_serial_priv {
	125	struct linflex_fsl *lfuart;
	126	};
	127
	128	int linflex_serial_setbrg(struct udevice *dev, int baudrate)
	129	{
	130	struct linflex_serial_priv *priv = dev_get_priv(dev);
	131
	132	_linflex_serial_setbrg(priv->lfuart, baudrate);
	133
	134	return 0;
	135	}
	136
	137	static int linflex_serial_getc(struct udevice *dev)
	138	{
	139	struct linflex_serial_priv *priv = dev_get_priv(dev);
	140
	141	return _linflex_serial_getc(priv->lfuart);
	142	}
	143
	144	static int linflex_serial_putc(struct udevice *dev, const char ch)
	145	{
	146
	147	struct linflex_serial_priv *priv = dev_get_priv(dev);
	148
	149	return _linflex_serial_putc(priv->lfuart, ch);
	150	}
	151
	152	static int linflex_serial_pending(struct udevice *dev, bool input)
	153	{
	154	struct linflex_serial_priv *priv = dev_get_priv(dev);
	155	uint32_t uartsr = __raw_readl(&priv->lfuart->uartsr);
	156
	157	if (input)
	158	return ((uartsr & UARTSR_DRF) && (uartsr & UARTSR_RMB)) ? 1 : 0;
	159	else
	160	return uartsr & UARTSR_DTF ? 0 : 1;
	161	}
	162
	163	static void linflex_serial_init_internal(struct linflex_fsl *lfuart)
	164	{
	165	_linflex_serial_init(lfuart);
	166	_linflex_serial_setbrg(lfuart, CONFIG_BAUDRATE);
	167	return;
	168	}
	169
	170	static int linflex_serial_probe(struct udevice *dev)
	171	{
0fd3d911	172	struct linflex_serial_plat *plat = dev_get_plat(dev);
1f68dbc8 SCS	173	struct linflex_serial_priv *priv = dev_get_priv(dev);
	174
	175	priv->lfuart = (struct linflex_fsl *)plat->base_addr;
	176	linflex_serial_init_internal(priv->lfuart);
	177
	178	return 0;
	179	}
	180
	181	static const struct dm_serial_ops linflex_serial_ops = {
	182	.putc = linflex_serial_putc,
	183	.pending = linflex_serial_pending,
	184	.getc = linflex_serial_getc,
	185	.setbrg = linflex_serial_setbrg,
	186	};
	187
	188	U_BOOT_DRIVER(serial_linflex) = {
	189	.name = "serial_linflex",
	190	.id = UCLASS_SERIAL,
	191	.probe = linflex_serial_probe,
	192	.ops = &linflex_serial_ops,
	193	.flags = DM_FLAG_PRE_RELOC,
41575d8e	194	.priv_auto = sizeof(struct linflex_serial_priv),
1f68dbc8 SCS	195	};
	196
	197	#ifdef CONFIG_DEBUG_UART_LINFLEXUART
	198
	199	#include <debug_uart.h>
	200
	201
	202	static inline void _debug_uart_init(void)
	203	{
	204	struct linflex_fsl base = (struct linflex_fsl )CONFIG_DEBUG_UART_BASE;
	205
	206	linflex_serial_init_internal(base);
	207	}
	208
	209	static inline void _debug_uart_putc(int ch)
	210	{
	211	struct linflex_fsl base = (struct linflex_fsl )CONFIG_DEBUG_UART_BASE;
	212
	213	/* XXX: Is this OK? Should this use the non-DM version? */
	214	_linflex_serial_putc(base, ch);
	215	}
	216
	217	DEBUG_UART_FUNCS
	218
	219	#endif /* CONFIG_DEBUG_UART_LINFLEXUART */