163 lines
3.5 KiB
C
163 lines
3.5 KiB
C
/*
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* (C) Copyright 2016 Beniamino Galvani <b.galvani@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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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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DECLARE_GLOBAL_DATA_PTR;
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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 = dev_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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{ }
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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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