mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2011-2015 Vladimir Zapolskiy <vz@mleia.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <serial.h>
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#include <dm/platform_data/lpc32xx_hsuart.h>
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#include <asm/arch/uart.h>
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#include <linux/compiler.h>
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struct lpc32xx_hsuart_priv {
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struct hsuart_regs *hsuart;
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};
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static int lpc32xx_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
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struct hsuart_regs *hsuart = priv->hsuart;
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u32 div;
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/* UART rate = PERIPH_CLK / ((HSU_RATE + 1) x 14) */
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div = (get_serial_clock() / 14 + baudrate / 2) / baudrate - 1;
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if (div > 255)
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div = 255;
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writel(div, &hsuart->rate);
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return 0;
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}
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static int lpc32xx_serial_getc(struct udevice *dev)
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{
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struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
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struct hsuart_regs *hsuart = priv->hsuart;
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if (!(readl(&hsuart->level) & HSUART_LEVEL_RX))
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return -EAGAIN;
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return readl(&hsuart->rx) & HSUART_RX_DATA;
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}
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static int lpc32xx_serial_putc(struct udevice *dev, const char c)
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{
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struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
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struct hsuart_regs *hsuart = priv->hsuart;
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/* Wait for empty FIFO */
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if (readl(&hsuart->level) & HSUART_LEVEL_TX)
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return -EAGAIN;
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writel(c, &hsuart->tx);
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return 0;
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}
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static int lpc32xx_serial_pending(struct udevice *dev, bool input)
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{
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struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
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struct hsuart_regs *hsuart = priv->hsuart;
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if (input) {
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if (readl(&hsuart->level) & HSUART_LEVEL_RX)
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return 1;
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} else {
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if (readl(&hsuart->level) & HSUART_LEVEL_TX)
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return 1;
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}
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return 0;
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}
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static int lpc32xx_serial_init(struct hsuart_regs *hsuart)
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{
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/* Disable hardware RTS and CTS flow control, set up RX and TX FIFO */
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writel(HSUART_CTRL_TMO_16 | HSUART_CTRL_HSU_OFFSET(20) |
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HSUART_CTRL_HSU_RX_TRIG_32 | HSUART_CTRL_HSU_TX_TRIG_0,
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&hsuart->ctrl);
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return 0;
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}
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static int lpc32xx_hsuart_probe(struct udevice *dev)
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{
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struct lpc32xx_hsuart_platdata *platdata = dev_get_platdata(dev);
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struct lpc32xx_hsuart_priv *priv = dev_get_priv(dev);
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priv->hsuart = (struct hsuart_regs *)platdata->base;
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lpc32xx_serial_init(priv->hsuart);
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return 0;
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}
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static const struct dm_serial_ops lpc32xx_hsuart_ops = {
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.setbrg = lpc32xx_serial_setbrg,
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.getc = lpc32xx_serial_getc,
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.putc = lpc32xx_serial_putc,
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.pending = lpc32xx_serial_pending,
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};
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U_BOOT_DRIVER(lpc32xx_hsuart) = {
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.name = "lpc32xx_hsuart",
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.id = UCLASS_SERIAL,
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.probe = lpc32xx_hsuart_probe,
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.ops = &lpc32xx_hsuart_ops,
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.priv_auto_alloc_size = sizeof(struct lpc32xx_hsuart_priv),
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.flags = DM_FLAG_PRE_RELOC,
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};
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