mirror of
https://github.com/AsahiLinux/u-boot
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3058104056
It is based on linux/drivers/tty/serial/bcm63xx_uart.c Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
300 lines
8.1 KiB
C
300 lines
8.1 KiB
C
/*
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* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
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*
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* Derived from linux/drivers/tty/serial/bcm63xx_uart.c:
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* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <clk.h>
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#include <debug_uart.h>
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#include <errno.h>
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#include <serial.h>
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#include <asm/io.h>
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#include <asm/types.h>
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#include <dm/device.h>
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/* UART Control register */
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#define UART_CTL_REG 0x0
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#define UART_CTL_RXTIMEOUT_MASK 0x1f
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#define UART_CTL_RXTIMEOUT_5 0x5
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#define UART_CTL_RSTRXFIFO_SHIFT 6
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#define UART_CTL_RSTRXFIFO_MASK (1 << UART_CTL_RSTRXFIFO_SHIFT)
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#define UART_CTL_RSTTXFIFO_SHIFT 7
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#define UART_CTL_RSTTXFIFO_MASK (1 << UART_CTL_RSTTXFIFO_SHIFT)
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#define UART_CTL_STOPBITS_SHIFT 8
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#define UART_CTL_STOPBITS_MASK (0xf << UART_CTL_STOPBITS_SHIFT)
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#define UART_CTL_STOPBITS_1 (0x7 << UART_CTL_STOPBITS_SHIFT)
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#define UART_CTL_BITSPERSYM_SHIFT 12
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#define UART_CTL_BITSPERSYM_MASK (0x3 << UART_CTL_BITSPERSYM_SHIFT)
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#define UART_CTL_BITSPERSYM_8 (0x3 << UART_CTL_BITSPERSYM_SHIFT)
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#define UART_CTL_XMITBRK_SHIFT 14
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#define UART_CTL_XMITBRK_MASK (1 << UART_CTL_XMITBRK_SHIFT)
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#define UART_CTL_RSVD_SHIFT 15
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#define UART_CTL_RSVD_MASK (1 << UART_CTL_RSVD_SHIFT)
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#define UART_CTL_RXPAREVEN_SHIFT 16
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#define UART_CTL_RXPAREVEN_MASK (1 << UART_CTL_RXPAREVEN_SHIFT)
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#define UART_CTL_RXPAREN_SHIFT 17
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#define UART_CTL_RXPAREN_MASK (1 << UART_CTL_RXPAREN_SHIFT)
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#define UART_CTL_TXPAREVEN_SHIFT 18
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#define UART_CTL_TXPAREVEN_MASK (1 << UART_CTL_TXPAREVEN_SHIFT)
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#define UART_CTL_TXPAREN_SHIFT 19
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#define UART_CTL_TXPAREN_MASK (1 << UART_CTL_TXPAREN_SHIFT)
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#define UART_CTL_LOOPBACK_SHIFT 20
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#define UART_CTL_LOOPBACK_MASK (1 << UART_CTL_LOOPBACK_SHIFT)
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#define UART_CTL_RXEN_SHIFT 21
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#define UART_CTL_RXEN_MASK (1 << UART_CTL_RXEN_SHIFT)
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#define UART_CTL_TXEN_SHIFT 22
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#define UART_CTL_TXEN_MASK (1 << UART_CTL_TXEN_SHIFT)
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#define UART_CTL_BRGEN_SHIFT 23
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#define UART_CTL_BRGEN_MASK (1 << UART_CTL_BRGEN_SHIFT)
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/* UART Baudword register */
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#define UART_BAUD_REG 0x4
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/* UART FIFO Config register */
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#define UART_FIFO_CFG_REG 0x8
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#define UART_FIFO_CFG_RX_SHIFT 8
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#define UART_FIFO_CFG_RX_MASK (0xf << UART_FIFO_CFG_RX_SHIFT)
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#define UART_FIFO_CFG_RX_4 (0x4 << UART_FIFO_CFG_RX_SHIFT)
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#define UART_FIFO_CFG_TX_SHIFT 12
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#define UART_FIFO_CFG_TX_MASK (0xf << UART_FIFO_CFG_TX_SHIFT)
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#define UART_FIFO_CFG_TX_4 (0x4 << UART_FIFO_CFG_TX_SHIFT)
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/* UART Interrupt register */
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#define UART_IR_REG 0x10
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#define UART_IR_STAT(x) (1 << (x))
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#define UART_IR_TXEMPTY 5
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#define UART_IR_RXOVER 7
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#define UART_IR_RXNOTEMPTY 11
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/* UART FIFO register */
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#define UART_FIFO_REG 0x14
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#define UART_FIFO_VALID_MASK 0xff
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#define UART_FIFO_FRAMEERR_SHIFT 8
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#define UART_FIFO_FRAMEERR_MASK (1 << UART_FIFO_FRAMEERR_SHIFT)
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#define UART_FIFO_PARERR_SHIFT 9
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#define UART_FIFO_PARERR_MASK (1 << UART_FIFO_PARERR_SHIFT)
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#define UART_FIFO_BRKDET_SHIFT 10
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#define UART_FIFO_BRKDET_MASK (1 << UART_FIFO_BRKDET_SHIFT)
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#define UART_FIFO_ANYERR_MASK (UART_FIFO_FRAMEERR_MASK | \
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UART_FIFO_PARERR_MASK | \
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UART_FIFO_BRKDET_MASK)
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struct bcm6345_serial_priv {
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void __iomem *base;
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ulong uartclk;
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};
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/* enable rx & tx operation on uart */
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static void bcm6345_serial_enable(void __iomem *base)
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{
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setbits_be32(base + UART_CTL_REG, UART_CTL_BRGEN_MASK |
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UART_CTL_TXEN_MASK | UART_CTL_RXEN_MASK);
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}
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/* disable rx & tx operation on uart */
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static void bcm6345_serial_disable(void __iomem *base)
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{
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clrbits_be32(base + UART_CTL_REG, UART_CTL_BRGEN_MASK |
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UART_CTL_TXEN_MASK | UART_CTL_RXEN_MASK);
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}
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/* clear all unread data in rx fifo and unsent data in tx fifo */
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static void bcm6345_serial_flush(void __iomem *base)
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{
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/* empty rx and tx fifo */
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setbits_be32(base + UART_CTL_REG, UART_CTL_RSTRXFIFO_MASK |
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UART_CTL_RSTTXFIFO_MASK);
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/* read any pending char to make sure all irq status are cleared */
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readl_be(base + UART_FIFO_REG);
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}
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static int bcm6345_serial_init(void __iomem *base, ulong clk, u32 baudrate)
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{
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u32 val;
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/* mask all irq and flush port */
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bcm6345_serial_disable(base);
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bcm6345_serial_flush(base);
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/* set uart control config */
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clrsetbits_be32(base + UART_CTL_REG,
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/* clear rx timeout */
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UART_CTL_RXTIMEOUT_MASK |
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/* clear stop bits */
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UART_CTL_STOPBITS_MASK |
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/* clear bits per symbol */
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UART_CTL_BITSPERSYM_MASK |
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/* clear xmit break */
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UART_CTL_XMITBRK_MASK |
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/* clear reserved bit */
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UART_CTL_RSVD_MASK |
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/* disable parity */
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UART_CTL_RXPAREN_MASK |
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UART_CTL_TXPAREN_MASK |
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/* disable loopback */
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UART_CTL_LOOPBACK_MASK,
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/* set timeout to 5 */
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UART_CTL_RXTIMEOUT_5 |
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/* set 8 bits/symbol */
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UART_CTL_BITSPERSYM_8 |
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/* set parity to even */
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UART_CTL_RXPAREVEN_MASK |
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UART_CTL_TXPAREVEN_MASK);
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/* set uart fifo config */
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clrsetbits_be32(base + UART_FIFO_CFG_REG,
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/* clear fifo config */
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UART_FIFO_CFG_RX_MASK |
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UART_FIFO_CFG_TX_MASK,
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/* set fifo config to 4 */
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UART_FIFO_CFG_RX_4 |
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UART_FIFO_CFG_TX_4);
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/* set baud rate */
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val = (clk / baudrate) / 16;
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if (val & 0x1)
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val = val;
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else
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val = val / 2 - 1;
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writel_be(val, base + UART_BAUD_REG);
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/* clear interrupts */
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writel_be(0, base + UART_IR_REG);
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/* enable uart */
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bcm6345_serial_enable(base);
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return 0;
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}
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static int bcm6345_serial_pending(struct udevice *dev, bool input)
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{
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struct bcm6345_serial_priv *priv = dev_get_priv(dev);
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u32 val = readl_be(priv->base + UART_IR_REG);
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if (input)
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return !!(val & UART_IR_STAT(UART_IR_RXNOTEMPTY));
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else
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return !(val & UART_IR_STAT(UART_IR_TXEMPTY));
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}
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static int bcm6345_serial_setbrg(struct udevice *dev, int baudrate)
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{
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struct bcm6345_serial_priv *priv = dev_get_priv(dev);
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return bcm6345_serial_init(priv->base, priv->uartclk, baudrate);
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}
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static int bcm6345_serial_putc(struct udevice *dev, const char ch)
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{
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struct bcm6345_serial_priv *priv = dev_get_priv(dev);
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u32 val;
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val = readl_be(priv->base + UART_IR_REG);
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if (!(val & UART_IR_STAT(UART_IR_TXEMPTY)))
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return -EAGAIN;
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writel_be(ch, priv->base + UART_FIFO_REG);
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return 0;
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}
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static int bcm6345_serial_getc(struct udevice *dev)
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{
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struct bcm6345_serial_priv *priv = dev_get_priv(dev);
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u32 val;
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val = readl_be(priv->base + UART_IR_REG);
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if (val & UART_IR_STAT(UART_IR_RXOVER))
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setbits_be32(priv->base + UART_CTL_REG,
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UART_CTL_RSTRXFIFO_MASK);
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if (!(val & UART_IR_STAT(UART_IR_RXNOTEMPTY)))
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return -EAGAIN;
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val = readl_be(priv->base + UART_FIFO_REG);
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if (val & UART_FIFO_ANYERR_MASK)
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return -EAGAIN;
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return val & UART_FIFO_VALID_MASK;
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}
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static int bcm6345_serial_probe(struct udevice *dev)
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{
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struct bcm6345_serial_priv *priv = dev_get_priv(dev);
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struct clk clk;
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fdt_addr_t addr;
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fdt_size_t size;
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int ret;
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/* get address */
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addr = dev_get_addr_size_index(dev, 0, &size);
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if (addr == FDT_ADDR_T_NONE)
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return -EINVAL;
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priv->base = ioremap(addr, size);
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/* get clock rate */
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ret = clk_get_by_index(dev, 0, &clk);
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if (ret < 0)
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return ret;
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priv->uartclk = clk_get_rate(&clk) / 2;
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clk_free(&clk);
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/* initialize serial */
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return bcm6345_serial_init(priv->base, priv->uartclk, CONFIG_BAUDRATE);
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}
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static const struct dm_serial_ops bcm6345_serial_ops = {
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.putc = bcm6345_serial_putc,
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.pending = bcm6345_serial_pending,
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.getc = bcm6345_serial_getc,
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.setbrg = bcm6345_serial_setbrg,
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};
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static const struct udevice_id bcm6345_serial_ids[] = {
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{ .compatible = "brcm,bcm6345-uart" },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(bcm6345_serial) = {
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.name = "bcm6345-uart",
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.id = UCLASS_SERIAL,
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.of_match = bcm6345_serial_ids,
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.probe = bcm6345_serial_probe,
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.priv_auto_alloc_size = sizeof(struct bcm6345_serial_priv),
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.ops = &bcm6345_serial_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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#ifdef CONFIG_DEBUG_UART_BCM6345
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static inline void _debug_uart_init(void)
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{
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void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
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bcm6345_serial_init(base, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
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}
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static inline void wait_xfered(void __iomem *base)
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{
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do {
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u32 val = readl_be(base + UART_IR_REG);
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if (val & UART_IR_STAT(UART_IR_TXEMPTY))
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break;
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} while (1);
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}
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static inline void _debug_uart_putc(int ch)
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{
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void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
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wait_xfered(base);
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writel_be(ch, base + UART_FIFO_REG);
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wait_xfered(base);
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}
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DEBUG_UART_FUNCS
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#endif
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