mirror of
https://github.com/brain-hackers/u-boot-brain
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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>
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2012-2015 Panasonic Corporation
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* Copyright (C) 2015-2016 Socionext Inc.
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* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <linux/io.h>
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#include <linux/serial_reg.h>
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#include <linux/sizes.h>
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#include <linux/errno.h>
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#include <serial.h>
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#include <fdtdec.h>
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/*
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* Note: Register map is slightly different from that of 16550.
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*/
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struct uniphier_serial {
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u32 rx; /* In: Receive buffer */
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#define tx rx /* Out: Transmit buffer */
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u32 ier; /* Interrupt Enable Register */
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u32 iir; /* In: Interrupt ID Register */
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u32 char_fcr; /* Charactor / FIFO Control Register */
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u32 lcr_mcr; /* Line/Modem Control Register */
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#define LCR_SHIFT 8
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#define LCR_MASK (0xff << (LCR_SHIFT))
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u32 lsr; /* In: Line Status Register */
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u32 msr; /* In: Modem Status Register */
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u32 __rsv0;
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u32 __rsv1;
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u32 dlr; /* Divisor Latch Register */
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};
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struct uniphier_serial_private_data {
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struct uniphier_serial __iomem *membase;
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unsigned int uartclk;
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};
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#define uniphier_serial_port(dev) \
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((struct uniphier_serial_private_data *)dev_get_priv(dev))->membase
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static int uniphier_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct uniphier_serial_private_data *priv = dev_get_priv(dev);
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struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
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const unsigned int mode_x_div = 16;
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unsigned int divisor;
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divisor = DIV_ROUND_CLOSEST(priv->uartclk, mode_x_div * baudrate);
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writel(divisor, &port->dlr);
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return 0;
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}
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static int uniphier_serial_getc(struct udevice *dev)
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{
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struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
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if (!(readl(&port->lsr) & UART_LSR_DR))
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return -EAGAIN;
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return readl(&port->rx);
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}
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static int uniphier_serial_putc(struct udevice *dev, const char c)
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{
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struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
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if (!(readl(&port->lsr) & UART_LSR_THRE))
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return -EAGAIN;
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writel(c, &port->tx);
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return 0;
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}
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static int uniphier_serial_pending(struct udevice *dev, bool input)
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{
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struct uniphier_serial __iomem *port = uniphier_serial_port(dev);
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if (input)
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return readl(&port->lsr) & UART_LSR_DR;
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else
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return !(readl(&port->lsr) & UART_LSR_THRE);
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}
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static int uniphier_serial_probe(struct udevice *dev)
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{
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DECLARE_GLOBAL_DATA_PTR;
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struct uniphier_serial_private_data *priv = dev_get_priv(dev);
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struct uniphier_serial __iomem *port;
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fdt_addr_t base;
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u32 tmp;
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base = devfdt_get_addr(dev);
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if (base == FDT_ADDR_T_NONE)
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return -EINVAL;
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port = devm_ioremap(dev, base, SZ_64);
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if (!port)
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return -ENOMEM;
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priv->membase = port;
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priv->uartclk = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
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"clock-frequency", 0);
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tmp = readl(&port->lcr_mcr);
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tmp &= ~LCR_MASK;
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tmp |= UART_LCR_WLEN8 << LCR_SHIFT;
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writel(tmp, &port->lcr_mcr);
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return 0;
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}
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static const struct udevice_id uniphier_uart_of_match[] = {
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{ .compatible = "socionext,uniphier-uart" },
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{ /* sentinel */ }
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};
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static const struct dm_serial_ops uniphier_serial_ops = {
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.setbrg = uniphier_serial_setbrg,
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.getc = uniphier_serial_getc,
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.putc = uniphier_serial_putc,
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.pending = uniphier_serial_pending,
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};
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U_BOOT_DRIVER(uniphier_serial) = {
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.name = "uniphier-uart",
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.id = UCLASS_SERIAL,
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.of_match = uniphier_uart_of_match,
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.probe = uniphier_serial_probe,
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.priv_auto_alloc_size = sizeof(struct uniphier_serial_private_data),
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.ops = &uniphier_serial_ops,
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};
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