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>
160 lines
3.5 KiB
C
160 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <linux/compiler.h>
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#include <serial.h>
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struct meson_uart {
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u32 wfifo;
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u32 rfifo;
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u32 control;
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u32 status;
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u32 misc;
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};
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struct meson_serial_platdata {
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struct meson_uart *reg;
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};
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/* AML_UART_STATUS bits */
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#define AML_UART_PARITY_ERR BIT(16)
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#define AML_UART_FRAME_ERR BIT(17)
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#define AML_UART_TX_FIFO_WERR BIT(18)
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#define AML_UART_RX_EMPTY BIT(20)
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#define AML_UART_TX_FULL BIT(21)
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#define AML_UART_TX_EMPTY BIT(22)
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#define AML_UART_XMIT_BUSY BIT(25)
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#define AML_UART_ERR (AML_UART_PARITY_ERR | \
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AML_UART_FRAME_ERR | \
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AML_UART_TX_FIFO_WERR)
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/* AML_UART_CONTROL bits */
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#define AML_UART_TX_EN BIT(12)
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#define AML_UART_RX_EN BIT(13)
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#define AML_UART_TX_RST BIT(22)
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#define AML_UART_RX_RST BIT(23)
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#define AML_UART_CLR_ERR BIT(24)
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static void meson_serial_init(struct meson_uart *uart)
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{
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u32 val;
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val = readl(&uart->control);
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val |= (AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLR_ERR);
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writel(val, &uart->control);
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val &= ~(AML_UART_RX_RST | AML_UART_TX_RST | AML_UART_CLR_ERR);
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writel(val, &uart->control);
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val |= (AML_UART_RX_EN | AML_UART_TX_EN);
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writel(val, &uart->control);
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}
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static int meson_serial_probe(struct udevice *dev)
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{
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struct meson_serial_platdata *plat = dev->platdata;
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struct meson_uart *const uart = plat->reg;
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meson_serial_init(uart);
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return 0;
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}
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static int meson_serial_getc(struct udevice *dev)
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{
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struct meson_serial_platdata *plat = dev->platdata;
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struct meson_uart *const uart = plat->reg;
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if (readl(&uart->status) & AML_UART_RX_EMPTY)
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return -EAGAIN;
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return readl(&uart->rfifo) & 0xff;
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}
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static int meson_serial_putc(struct udevice *dev, const char ch)
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{
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struct meson_serial_platdata *plat = dev->platdata;
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struct meson_uart *const uart = plat->reg;
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if (readl(&uart->status) & AML_UART_TX_FULL)
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return -EAGAIN;
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writel(ch, &uart->wfifo);
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return 0;
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}
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static int meson_serial_pending(struct udevice *dev, bool input)
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{
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struct meson_serial_platdata *plat = dev->platdata;
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struct meson_uart *const uart = plat->reg;
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uint32_t status = readl(&uart->status);
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if (input)
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return !(status & AML_UART_RX_EMPTY);
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else
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return !(status & AML_UART_TX_FULL);
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}
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static int meson_serial_ofdata_to_platdata(struct udevice *dev)
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{
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struct meson_serial_platdata *plat = dev->platdata;
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fdt_addr_t addr;
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addr = devfdt_get_addr(dev);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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plat->reg = (struct meson_uart *)addr;
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return 0;
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}
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static const struct dm_serial_ops meson_serial_ops = {
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.putc = meson_serial_putc,
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.pending = meson_serial_pending,
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.getc = meson_serial_getc,
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};
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static const struct udevice_id meson_serial_ids[] = {
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{ .compatible = "amlogic,meson-uart" },
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{ .compatible = "amlogic,meson-gx-uart" },
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{ }
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};
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U_BOOT_DRIVER(serial_meson) = {
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.name = "serial_meson",
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.id = UCLASS_SERIAL,
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.of_match = meson_serial_ids,
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.probe = meson_serial_probe,
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.ops = &meson_serial_ops,
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.flags = DM_FLAG_PRE_RELOC,
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.ofdata_to_platdata = meson_serial_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct meson_serial_platdata),
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};
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#ifdef CONFIG_DEBUG_UART_MESON
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#include <debug_uart.h>
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static inline void _debug_uart_init(void)
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{
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}
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static inline void _debug_uart_putc(int ch)
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{
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struct meson_uart *regs = (struct meson_uart *)CONFIG_DEBUG_UART_BASE;
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while (readl(®s->status) & AML_UART_TX_FULL)
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;
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writel(ch, ®s->wfifo);
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}
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DEBUG_UART_FUNCS
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#endif
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