1*83d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+
2cc35fdbcSVladimir Zapolskiy /*
3f21069edSVladimir Zapolskiy * Copyright (C) 2011-2015 Vladimir Zapolskiy <vz@mleia.com>
4cc35fdbcSVladimir Zapolskiy */
5cc35fdbcSVladimir Zapolskiy
6cc35fdbcSVladimir Zapolskiy #include <common.h>
7f21069edSVladimir Zapolskiy #include <dm.h>
8e503f90aSMarek Vasut #include <serial.h>
9f21069edSVladimir Zapolskiy #include <dm/platform_data/lpc32xx_hsuart.h>
10f21069edSVladimir Zapolskiy
11f21069edSVladimir Zapolskiy #include <asm/arch/uart.h>
12e503f90aSMarek Vasut #include <linux/compiler.h>
13cc35fdbcSVladimir Zapolskiy
14f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv {
15f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart;
16f21069edSVladimir Zapolskiy };
17cc35fdbcSVladimir Zapolskiy
lpc32xx_serial_setbrg(struct udevice * dev,int baudrate)18f21069edSVladimir Zapolskiy static int lpc32xx_serial_setbrg(struct udevice *dev, int baudrate)
19cc35fdbcSVladimir Zapolskiy {
20f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
21f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart = priv->hsuart;
22cc35fdbcSVladimir Zapolskiy u32 div;
23cc35fdbcSVladimir Zapolskiy
24cc35fdbcSVladimir Zapolskiy /* UART rate = PERIPH_CLK / ((HSU_RATE + 1) x 14) */
25f21069edSVladimir Zapolskiy div = (get_serial_clock() / 14 + baudrate / 2) / baudrate - 1;
26cc35fdbcSVladimir Zapolskiy if (div > 255)
27cc35fdbcSVladimir Zapolskiy div = 255;
28cc35fdbcSVladimir Zapolskiy
29cc35fdbcSVladimir Zapolskiy writel(div, &hsuart->rate);
30f21069edSVladimir Zapolskiy
31f21069edSVladimir Zapolskiy return 0;
32cc35fdbcSVladimir Zapolskiy }
33cc35fdbcSVladimir Zapolskiy
lpc32xx_serial_getc(struct udevice * dev)34f21069edSVladimir Zapolskiy static int lpc32xx_serial_getc(struct udevice *dev)
35cc35fdbcSVladimir Zapolskiy {
36f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
37f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart = priv->hsuart;
38f21069edSVladimir Zapolskiy
39f21069edSVladimir Zapolskiy if (!(readl(&hsuart->level) & HSUART_LEVEL_RX))
40f21069edSVladimir Zapolskiy return -EAGAIN;
41cc35fdbcSVladimir Zapolskiy
42cc35fdbcSVladimir Zapolskiy return readl(&hsuart->rx) & HSUART_RX_DATA;
43cc35fdbcSVladimir Zapolskiy }
44cc35fdbcSVladimir Zapolskiy
lpc32xx_serial_putc(struct udevice * dev,const char c)45f21069edSVladimir Zapolskiy static int lpc32xx_serial_putc(struct udevice *dev, const char c)
46cc35fdbcSVladimir Zapolskiy {
47f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
48f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart = priv->hsuart;
49f21069edSVladimir Zapolskiy
50f21069edSVladimir Zapolskiy /* Wait for empty FIFO */
51f21069edSVladimir Zapolskiy if (readl(&hsuart->level) & HSUART_LEVEL_TX)
52f21069edSVladimir Zapolskiy return -EAGAIN;
535deccafaSVladimir Zapolskiy
54cc35fdbcSVladimir Zapolskiy writel(c, &hsuart->tx);
55cc35fdbcSVladimir Zapolskiy
56cc35fdbcSVladimir Zapolskiy return 0;
57cc35fdbcSVladimir Zapolskiy }
58cc35fdbcSVladimir Zapolskiy
lpc32xx_serial_pending(struct udevice * dev,bool input)59f21069edSVladimir Zapolskiy static int lpc32xx_serial_pending(struct udevice *dev, bool input)
60cc35fdbcSVladimir Zapolskiy {
61f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
62f21069edSVladimir Zapolskiy struct hsuart_regs *hsuart = priv->hsuart;
63cc35fdbcSVladimir Zapolskiy
64f21069edSVladimir Zapolskiy if (input) {
65f21069edSVladimir Zapolskiy if (readl(&hsuart->level) & HSUART_LEVEL_RX)
66f21069edSVladimir Zapolskiy return 1;
67f21069edSVladimir Zapolskiy } else {
68f21069edSVladimir Zapolskiy if (readl(&hsuart->level) & HSUART_LEVEL_TX)
69f21069edSVladimir Zapolskiy return 1;
70f21069edSVladimir Zapolskiy }
71f21069edSVladimir Zapolskiy
72f21069edSVladimir Zapolskiy return 0;
73f21069edSVladimir Zapolskiy }
74f21069edSVladimir Zapolskiy
lpc32xx_serial_init(struct hsuart_regs * hsuart)75f21069edSVladimir Zapolskiy static int lpc32xx_serial_init(struct hsuart_regs *hsuart)
76f21069edSVladimir Zapolskiy {
77cc35fdbcSVladimir Zapolskiy /* Disable hardware RTS and CTS flow control, set up RX and TX FIFO */
78cc35fdbcSVladimir Zapolskiy writel(HSUART_CTRL_TMO_16 | HSUART_CTRL_HSU_OFFSET(20) |
79cc35fdbcSVladimir Zapolskiy HSUART_CTRL_HSU_RX_TRIG_32 | HSUART_CTRL_HSU_TX_TRIG_0,
80cc35fdbcSVladimir Zapolskiy &hsuart->ctrl);
81f21069edSVladimir Zapolskiy
82e503f90aSMarek Vasut return 0;
83cc35fdbcSVladimir Zapolskiy }
84cc35fdbcSVladimir Zapolskiy
lpc32xx_hsuart_probe(struct udevice * dev)85f21069edSVladimir Zapolskiy static int lpc32xx_hsuart_probe(struct udevice *dev)
86f21069edSVladimir Zapolskiy {
87f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_platdata *platdata = dev_get_platdata(dev);
88f21069edSVladimir Zapolskiy struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
89f21069edSVladimir Zapolskiy
90f21069edSVladimir Zapolskiy priv->hsuart = (struct hsuart_regs *)platdata->base;
91f21069edSVladimir Zapolskiy
92f21069edSVladimir Zapolskiy lpc32xx_serial_init(priv->hsuart);
93f21069edSVladimir Zapolskiy
94f21069edSVladimir Zapolskiy return 0;
95f21069edSVladimir Zapolskiy }
96f21069edSVladimir Zapolskiy
97f21069edSVladimir Zapolskiy static const struct dm_serial_ops lpc32xx_hsuart_ops = {
98e503f90aSMarek Vasut .setbrg = lpc32xx_serial_setbrg,
99e503f90aSMarek Vasut .getc = lpc32xx_serial_getc,
100f21069edSVladimir Zapolskiy .putc = lpc32xx_serial_putc,
101f21069edSVladimir Zapolskiy .pending = lpc32xx_serial_pending,
102e503f90aSMarek Vasut };
103e503f90aSMarek Vasut
104f21069edSVladimir Zapolskiy U_BOOT_DRIVER(lpc32xx_hsuart) = {
105f21069edSVladimir Zapolskiy .name = "lpc32xx_hsuart",
106f21069edSVladimir Zapolskiy .id = UCLASS_SERIAL,
107f21069edSVladimir Zapolskiy .probe = lpc32xx_hsuart_probe,
108f21069edSVladimir Zapolskiy .ops = &lpc32xx_hsuart_ops,
109f21069edSVladimir Zapolskiy .priv_auto_alloc_size = sizeof(struct lpc32xx_hsuart_priv),
110f21069edSVladimir Zapolskiy .flags = DM_FLAG_PRE_RELOC,
111f21069edSVladimir Zapolskiy };
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