1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2011-2015 Vladimir Zapolskiy <vz@mleia.com>
7 #include <clock_legacy.h>
10 #include <dm/platform_data/lpc32xx_hsuart.h>
12 #include <asm/arch/uart.h>
13 #include <linux/compiler.h>
15 struct lpc32xx_hsuart_priv {
16 struct hsuart_regs *hsuart;
19 static int lpc32xx_serial_setbrg(struct udevice *dev, int baudrate)
21 struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
22 struct hsuart_regs *hsuart = priv->hsuart;
25 /* UART rate = PERIPH_CLK / ((HSU_RATE + 1) x 14) */
26 div = (get_serial_clock() / 14 + baudrate / 2) / baudrate - 1;
30 writel(div, &hsuart->rate);
35 static int lpc32xx_serial_getc(struct udevice *dev)
37 struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
38 struct hsuart_regs *hsuart = priv->hsuart;
40 if (!(readl(&hsuart->level) & HSUART_LEVEL_RX))
43 return readl(&hsuart->rx) & HSUART_RX_DATA;
46 static int lpc32xx_serial_putc(struct udevice *dev, const char c)
48 struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
49 struct hsuart_regs *hsuart = priv->hsuart;
51 /* Wait for empty FIFO */
52 if (readl(&hsuart->level) & HSUART_LEVEL_TX)
55 writel(c, &hsuart->tx);
60 static int lpc32xx_serial_pending(struct udevice *dev, bool input)
62 struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
63 struct hsuart_regs *hsuart = priv->hsuart;
66 if (readl(&hsuart->level) & HSUART_LEVEL_RX)
69 if (readl(&hsuart->level) & HSUART_LEVEL_TX)
76 static int lpc32xx_serial_init(struct hsuart_regs *hsuart)
78 /* Disable hardware RTS and CTS flow control, set up RX and TX FIFO */
79 writel(HSUART_CTRL_TMO_16 | HSUART_CTRL_HSU_OFFSET(20) |
80 HSUART_CTRL_HSU_RX_TRIG_32 | HSUART_CTRL_HSU_TX_TRIG_0,
86 static int lpc32xx_hsuart_probe(struct udevice *dev)
88 struct lpc32xx_hsuart_platdata *platdata = dev_get_platdata(dev);
89 struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
91 priv->hsuart = (struct hsuart_regs *)platdata->base;
93 lpc32xx_serial_init(priv->hsuart);
98 static const struct dm_serial_ops lpc32xx_hsuart_ops = {
99 .setbrg = lpc32xx_serial_setbrg,
100 .getc = lpc32xx_serial_getc,
101 .putc = lpc32xx_serial_putc,
102 .pending = lpc32xx_serial_pending,
105 U_BOOT_DRIVER(lpc32xx_hsuart) = {
106 .name = "lpc32xx_hsuart",
108 .probe = lpc32xx_hsuart_probe,
109 .ops = &lpc32xx_hsuart_ops,
110 .priv_auto_alloc_size = sizeof(struct lpc32xx_hsuart_priv),
111 .flags = DM_FLAG_PRE_RELOC,