Git Repo - u-boot.git/blame_incremental - drivers/serial/lpc32xx

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Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright (C) 2011-2015 Vladimir Zapolskiy <[email protected]>
	4	*/
	5
	6	#include <common.h>
	7	#include <dm.h>
	8	#include <serial.h>
	9	#include <dm/platform_data/lpc32xx_hsuart.h>
	10
	11	#include <asm/arch/uart.h>
	12	#include <linux/compiler.h>
	13
	14	struct lpc32xx_hsuart_priv {
	15	struct hsuart_regs *hsuart;
	16	};
	17
	18	static int lpc32xx_serial_setbrg(struct udevice *dev, int baudrate)
	19	{
	20	struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
	21	struct hsuart_regs *hsuart = priv->hsuart;
	22	u32 div;
	23
	24	/* UART rate = PERIPH_CLK / ((HSU_RATE + 1) x 14) */
	25	div = (get_serial_clock() / 14 + baudrate / 2) / baudrate - 1;
	26	if (div > 255)
	27	div = 255;
	28
	29	writel(div, &hsuart->rate);
	30
	31	return 0;
	32	}
	33
	34	static int lpc32xx_serial_getc(struct udevice *dev)
	35	{
	36	struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
	37	struct hsuart_regs *hsuart = priv->hsuart;
	38
	39	if (!(readl(&hsuart->level) & HSUART_LEVEL_RX))
	40	return -EAGAIN;
	41
	42	return readl(&hsuart->rx) & HSUART_RX_DATA;
	43	}
	44
	45	static int lpc32xx_serial_putc(struct udevice *dev, const char c)
	46	{
	47	struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
	48	struct hsuart_regs *hsuart = priv->hsuart;
	49
	50	/* Wait for empty FIFO */
	51	if (readl(&hsuart->level) & HSUART_LEVEL_TX)
	52	return -EAGAIN;
	53
	54	writel(c, &hsuart->tx);
	55
	56	return 0;
	57	}
	58
	59	static int lpc32xx_serial_pending(struct udevice *dev, bool input)
	60	{
	61	struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
	62	struct hsuart_regs *hsuart = priv->hsuart;
	63
	64	if (input) {
	65	if (readl(&hsuart->level) & HSUART_LEVEL_RX)
	66	return 1;
	67	} else {
	68	if (readl(&hsuart->level) & HSUART_LEVEL_TX)
	69	return 1;
	70	}
	71
	72	return 0;
	73	}
	74
	75	static int lpc32xx_serial_init(struct hsuart_regs *hsuart)
	76	{
	77	/* Disable hardware RTS and CTS flow control, set up RX and TX FIFO */
	78	writel(HSUART_CTRL_TMO_16 \| HSUART_CTRL_HSU_OFFSET(20) \|
	79	HSUART_CTRL_HSU_RX_TRIG_32 \| HSUART_CTRL_HSU_TX_TRIG_0,
	80	&hsuart->ctrl);
	81
	82	return 0;
	83	}
	84
	85	static int lpc32xx_hsuart_probe(struct udevice *dev)
	86	{
	87	struct lpc32xx_hsuart_platdata *platdata = dev_get_platdata(dev);
	88	struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
	89
	90	priv->hsuart = (struct hsuart_regs *)platdata->base;
	91
	92	lpc32xx_serial_init(priv->hsuart);
	93
	94	return 0;
	95	}
	96
	97	static const struct dm_serial_ops lpc32xx_hsuart_ops = {
	98	.setbrg = lpc32xx_serial_setbrg,
	99	.getc = lpc32xx_serial_getc,
	100	.putc = lpc32xx_serial_putc,
	101	.pending = lpc32xx_serial_pending,
	102	};
	103
	104	U_BOOT_DRIVER(lpc32xx_hsuart) = {
	105	.name = "lpc32xx_hsuart",
	106	.id = UCLASS_SERIAL,
	107	.probe = lpc32xx_hsuart_probe,
	108	.ops = &lpc32xx_hsuart_ops,
	109	.priv_auto_alloc_size = sizeof(struct lpc32xx_hsuart_priv),
	110	.flags = DM_FLAG_PRE_RELOC,
	111	};