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

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

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <watchdog.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;

#ifndef CONFIG_DM_SERIAL
#error "The linflex serial driver does not have non-DM support."
#endif

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_platdata {
	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_platdata *plat = dev->platdata;
	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_alloc_size	= 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
1f68dbc8 SCS	1	/*
	2	* (C) Copyright 2013-2016 Freescale Semiconductor, Inc.
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include <common.h>
	8	#include <dm.h>
	9	#include <errno.h>
	10	#include <watchdog.h>
	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
	38	#ifndef CONFIG_DM_SERIAL
	39	#error "The linflex serial driver does not have non-DM support."
	40	#endif
	41
	42	static void _linflex_serial_setbrg(struct linflex_fsl *base, int baudrate)
	43	{
	44	u32 clk = mxc_get_clock(MXC_UART_CLK);
	45	u32 ibr, fbr;
	46
	47	if (!baudrate)
	48	baudrate = CONFIG_BAUDRATE;
	49
	50	ibr = (u32) (clk / (16 * gd->baudrate));
	51	fbr = (u32) (clk % (16 * gd->baudrate)) * 16;
	52
	53	__raw_writel(ibr, &base->linibrr);
	54	__raw_writel(fbr, &base->linfbrr);
	55	}
	56
	57	static int _linflex_serial_getc(struct linflex_fsl *base)
	58	{
	59	char c;
	60
	61	if (!(__raw_readb(&base->uartsr) & UARTSR_DRF))
	62	return -EAGAIN;
	63
	64	if (!(__raw_readl(&base->uartsr) & UARTSR_RMB))
65	return -EAGAIN;
66
67	c = __raw_readl(&base->bdrm);
68	__raw_writeb((__raw_readb(&base->uartsr) \| (UARTSR_DRF \| UARTSR_RMB)),
69	&base->uartsr);
70	return c;
71	}
72
73	static int _linflex_serial_putc(struct linflex_fsl *base, const char c)
74	{
75	__raw_writeb(c, &base->bdrl);
76
77
78	if (!(__raw_readb(&base->uartsr) & UARTSR_DTF))
79	return -EAGAIN;
80
81	__raw_writeb((__raw_readb(&base->uartsr) \| UARTSR_DTF), &base->uartsr);
82
83	return 0;
84	}
85
86	/*
87	* Initialise the serial port with the given baudrate. The settings
88	* are always 8 data bits, no parity, 1 stop bit, no start bits.
89	*/
90	static int _linflex_serial_init(struct linflex_fsl *base)
91	{
92	volatile u32 ctrl;
93
94	/* set the Linflex in master mode amd activate by-pass filter */
95	ctrl = LINCR1_BF \| LINCR1_MME;
96	__raw_writel(ctrl, &base->lincr1);
97
98	/* init mode */
99	ctrl \|= LINCR1_INIT;
100	__raw_writel(ctrl, &base->lincr1);
101
102	/* waiting for init mode entry - TODO: add a timeout */
103	while ((__raw_readl(&base->linsr) & LINSR_LINS_MASK) !=
104	LINSR_LINS_INITMODE);
105
106	/* set UART bit to allow writing other bits */
107	__raw_writel(UARTCR_UART, &base->uartcr);
108
109	/* provide data bits, parity, stop bit, etc */
110	serial_setbrg();
111
112	/* 8 bit data, no parity, Tx and Rx enabled, UART mode */
113	__raw_writel(UARTCR_PC1 \| UARTCR_RXEN \| UARTCR_TXEN \| UARTCR_PC0
114	\| UARTCR_WL0 \| UARTCR_UART, &base->uartcr);
115
116	ctrl = __raw_readl(&base->lincr1);
117	ctrl &= ~LINCR1_INIT;
118	__raw_writel(ctrl, &base->lincr1); /* end init mode */
119
120	return 0;
121	}
122
123	struct linflex_serial_platdata {
124	struct linflex_fsl *base_addr;
125	u8 port_id; /* do we need this? */
126	};
127
128	struct linflex_serial_priv {
129	struct linflex_fsl *lfuart;
130	};
131
132	int linflex_serial_setbrg(struct udevice *dev, int baudrate)
133	{
134	struct linflex_serial_priv *priv = dev_get_priv(dev);
135
136	_linflex_serial_setbrg(priv->lfuart, baudrate);
137
138	return 0;
139	}
140
141	static int linflex_serial_getc(struct udevice *dev)
142	{
143	struct linflex_serial_priv *priv = dev_get_priv(dev);
144
145	return _linflex_serial_getc(priv->lfuart);
146	}
147
148	static int linflex_serial_putc(struct udevice *dev, const char ch)
149	{
150
151	struct linflex_serial_priv *priv = dev_get_priv(dev);
152
153	return _linflex_serial_putc(priv->lfuart, ch);
154	}
155
156	static int linflex_serial_pending(struct udevice *dev, bool input)
157	{
158	struct linflex_serial_priv *priv = dev_get_priv(dev);
159	uint32_t uartsr = __raw_readl(&priv->lfuart->uartsr);
160
161	if (input)
162	return ((uartsr & UARTSR_DRF) && (uartsr & UARTSR_RMB)) ? 1 : 0;
163	else
164	return uartsr & UARTSR_DTF ? 0 : 1;
165	}
166
167	static void linflex_serial_init_internal(struct linflex_fsl *lfuart)
168	{
169	_linflex_serial_init(lfuart);
170	_linflex_serial_setbrg(lfuart, CONFIG_BAUDRATE);
171	return;
172	}
173
174	static int linflex_serial_probe(struct udevice *dev)
175	{
176	struct linflex_serial_platdata *plat = dev->platdata;
177	struct linflex_serial_priv *priv = dev_get_priv(dev);
178
179	priv->lfuart = (struct linflex_fsl *)plat->base_addr;
180	linflex_serial_init_internal(priv->lfuart);
181
182	return 0;
183	}
184
185	static const struct dm_serial_ops linflex_serial_ops = {
186	.putc = linflex_serial_putc,
187	.pending = linflex_serial_pending,
188	.getc = linflex_serial_getc,
189	.setbrg = linflex_serial_setbrg,
190	};
191
192	U_BOOT_DRIVER(serial_linflex) = {
193	.name = "serial_linflex",
194	.id = UCLASS_SERIAL,
195	.probe = linflex_serial_probe,
196	.ops = &linflex_serial_ops,
197	.flags = DM_FLAG_PRE_RELOC,
198	.priv_auto_alloc_size = sizeof(struct linflex_serial_priv),
199	};
200
201	#ifdef CONFIG_DEBUG_UART_LINFLEXUART
202
203	#include <debug_uart.h>
204
205
206	static inline void _debug_uart_init(void)
207	{
208	struct linflex_fsl base = (struct linflex_fsl )CONFIG_DEBUG_UART_BASE;
209
210	linflex_serial_init_internal(base);
211	}
212
213	static inline void _debug_uart_putc(int ch)
214	{
215	struct linflex_fsl base = (struct linflex_fsl )CONFIG_DEBUG_UART_BASE;
216
217	/* XXX: Is this OK? Should this use the non-DM version? */
218	_linflex_serial_putc(base, ch);
219	}
220
221	DEBUG_UART_FUNCS
222
223	#endif /* CONFIG_DEBUG_UART_LINFLEXUART */