+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (C) 2018 Philippe Reynes <philippe.reynes@softathome.com>
- *
- * Derived from linux/drivers/tty/serial/bcm63xx_uart.c:
- * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
- * Derived from linux/drivers/tty/serial/serial_bcm6345.c
- * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
- */
-
-#include <clk.h>
-#include <dm.h>
-#include <debug_uart.h>
-#include <errno.h>
-#include <serial.h>
-#include <asm/io.h>
-#include <asm/types.h>
-
-/* UART Control register */
-#define UART_CTL_REG 0x0
-#define UART_CTL_RXTIMEOUT_MASK 0x1f
-#define UART_CTL_RXTIMEOUT_5 0x5
-#define UART_CTL_RSTRXFIFO_SHIFT 6
-#define UART_CTL_RSTRXFIFO_MASK (1 << UART_CTL_RSTRXFIFO_SHIFT)
-#define UART_CTL_RSTTXFIFO_SHIFT 7
-#define UART_CTL_RSTTXFIFO_MASK (1 << UART_CTL_RSTTXFIFO_SHIFT)
-#define UART_CTL_STOPBITS_SHIFT 8
-#define UART_CTL_STOPBITS_MASK (0xf << UART_CTL_STOPBITS_SHIFT)
-#define UART_CTL_STOPBITS_1 (0x7 << UART_CTL_STOPBITS_SHIFT)
-#define UART_CTL_BITSPERSYM_SHIFT 12
-#define UART_CTL_BITSPERSYM_MASK (0x3 << UART_CTL_BITSPERSYM_SHIFT)
-#define UART_CTL_BITSPERSYM_8 (0x3 << UART_CTL_BITSPERSYM_SHIFT)
-#define UART_CTL_XMITBRK_SHIFT 14
-#define UART_CTL_XMITBRK_MASK (1 << UART_CTL_XMITBRK_SHIFT)
-#define UART_CTL_RSVD_SHIFT 15
-#define UART_CTL_RSVD_MASK (1 << UART_CTL_RSVD_SHIFT)
-#define UART_CTL_RXPAREVEN_SHIFT 16
-#define UART_CTL_RXPAREVEN_MASK (1 << UART_CTL_RXPAREVEN_SHIFT)
-#define UART_CTL_RXPAREN_SHIFT 17
-#define UART_CTL_RXPAREN_MASK (1 << UART_CTL_RXPAREN_SHIFT)
-#define UART_CTL_TXPAREVEN_SHIFT 18
-#define UART_CTL_TXPAREVEN_MASK (1 << UART_CTL_TXPAREVEN_SHIFT)
-#define UART_CTL_TXPAREN_SHIFT 19
-#define UART_CTL_TXPAREN_MASK (1 << UART_CTL_TXPAREN_SHIFT)
-#define UART_CTL_LOOPBACK_SHIFT 20
-#define UART_CTL_LOOPBACK_MASK (1 << UART_CTL_LOOPBACK_SHIFT)
-#define UART_CTL_RXEN_SHIFT 21
-#define UART_CTL_RXEN_MASK (1 << UART_CTL_RXEN_SHIFT)
-#define UART_CTL_TXEN_SHIFT 22
-#define UART_CTL_TXEN_MASK (1 << UART_CTL_TXEN_SHIFT)
-#define UART_CTL_BRGEN_SHIFT 23
-#define UART_CTL_BRGEN_MASK (1 << UART_CTL_BRGEN_SHIFT)
-
-/* UART Baudword register */
-#define UART_BAUD_REG 0x4
-
-/* UART FIFO Config register */
-#define UART_FIFO_CFG_REG 0x8
-#define UART_FIFO_CFG_RX_SHIFT 8
-#define UART_FIFO_CFG_RX_MASK (0xf << UART_FIFO_CFG_RX_SHIFT)
-#define UART_FIFO_CFG_RX_4 (0x4 << UART_FIFO_CFG_RX_SHIFT)
-#define UART_FIFO_CFG_TX_SHIFT 12
-#define UART_FIFO_CFG_TX_MASK (0xf << UART_FIFO_CFG_TX_SHIFT)
-#define UART_FIFO_CFG_TX_4 (0x4 << UART_FIFO_CFG_TX_SHIFT)
-
-/* UART Interrupt register */
-#define UART_IR_REG 0x10
-#define UART_IR_STAT(x) (1 << (x))
-#define UART_IR_TXEMPTY 5
-#define UART_IR_RXOVER 7
-#define UART_IR_RXNOTEMPTY 11
-
-/* UART FIFO register */
-#define UART_FIFO_REG 0x14
-#define UART_FIFO_VALID_MASK 0xff
-#define UART_FIFO_FRAMEERR_SHIFT 8
-#define UART_FIFO_FRAMEERR_MASK (1 << UART_FIFO_FRAMEERR_SHIFT)
-#define UART_FIFO_PARERR_SHIFT 9
-#define UART_FIFO_PARERR_MASK (1 << UART_FIFO_PARERR_SHIFT)
-#define UART_FIFO_BRKDET_SHIFT 10
-#define UART_FIFO_BRKDET_MASK (1 << UART_FIFO_BRKDET_SHIFT)
-#define UART_FIFO_ANYERR_MASK (UART_FIFO_FRAMEERR_MASK | \
- UART_FIFO_PARERR_MASK | \
- UART_FIFO_BRKDET_MASK)
-
-struct bcm6858_serial_priv {
- void __iomem *base;
- ulong uartclk;
-};
-
-/* enable rx & tx operation on uart */
-static void bcm6858_serial_enable(void __iomem *base)
-{
- setbits_le32(base + UART_CTL_REG, UART_CTL_BRGEN_MASK |
- UART_CTL_TXEN_MASK | UART_CTL_RXEN_MASK);
-}
-
-/* disable rx & tx operation on uart */
-static void bcm6858_serial_disable(void __iomem *base)
-{
- clrbits_le32(base + UART_CTL_REG, UART_CTL_BRGEN_MASK |
- UART_CTL_TXEN_MASK | UART_CTL_RXEN_MASK);
-}
-
-/* clear all unread data in rx fifo and unsent data in tx fifo */
-static void bcm6858_serial_flush(void __iomem *base)
-{
- /* empty rx and tx fifo */
- setbits_le32(base + UART_CTL_REG, UART_CTL_RSTRXFIFO_MASK |
- UART_CTL_RSTTXFIFO_MASK);
-
- /* read any pending char to make sure all irq status are cleared */
- readl(base + UART_FIFO_REG);
-}
-
-static int bcm6858_serial_init(void __iomem *base, ulong clk, u32 baudrate)
-{
- u32 val;
-
- /* mask all irq and flush port */
- bcm6858_serial_disable(base);
- bcm6858_serial_flush(base);
-
- /* set uart control config */
- clrsetbits_le32(base + UART_CTL_REG,
- /* clear rx timeout */
- UART_CTL_RXTIMEOUT_MASK |
- /* clear stop bits */
- UART_CTL_STOPBITS_MASK |
- /* clear bits per symbol */
- UART_CTL_BITSPERSYM_MASK |
- /* clear xmit break */
- UART_CTL_XMITBRK_MASK |
- /* clear reserved bit */
- UART_CTL_RSVD_MASK |
- /* disable parity */
- UART_CTL_RXPAREN_MASK |
- UART_CTL_TXPAREN_MASK |
- /* disable loopback */
- UART_CTL_LOOPBACK_MASK,
- /* set timeout to 5 */
- UART_CTL_RXTIMEOUT_5 |
- /* set 8 bits/symbol */
- UART_CTL_BITSPERSYM_8 |
- /* set 1 stop bit */
- UART_CTL_STOPBITS_1 |
- /* set parity to even */
- UART_CTL_RXPAREVEN_MASK |
- UART_CTL_TXPAREVEN_MASK);
-
- /* set uart fifo config */
- clrsetbits_le32(base + UART_FIFO_CFG_REG,
- /* clear fifo config */
- UART_FIFO_CFG_RX_MASK |
- UART_FIFO_CFG_TX_MASK,
- /* set fifo config to 4 */
- UART_FIFO_CFG_RX_4 |
- UART_FIFO_CFG_TX_4);
-
- /* set baud rate */
- val = ((clk / baudrate) >> 4);
- if (val & 0x1)
- val = (val >> 1);
- else
- val = (val >> 1) - 1;
- writel(val, base + UART_BAUD_REG);
-
- /* clear interrupts */
- writel(0, base + UART_IR_REG);
-
- /* enable uart */
- bcm6858_serial_enable(base);
-
- return 0;
-}
-
-static int bcm6858_serial_pending(struct udevice *dev, bool input)
-{
- struct bcm6858_serial_priv *priv = dev_get_priv(dev);
- u32 val = readl(priv->base + UART_IR_REG);
-
- if (input)
- return !!(val & UART_IR_STAT(UART_IR_RXNOTEMPTY));
- else
- return !(val & UART_IR_STAT(UART_IR_TXEMPTY));
-}
-
-static int bcm6858_serial_setbrg(struct udevice *dev, int baudrate)
-{
- struct bcm6858_serial_priv *priv = dev_get_priv(dev);
-
- return bcm6858_serial_init(priv->base, priv->uartclk, baudrate);
-}
-
-static int bcm6858_serial_putc(struct udevice *dev, const char ch)
-{
- struct bcm6858_serial_priv *priv = dev_get_priv(dev);
- u32 val;
-
- val = readl(priv->base + UART_IR_REG);
- if (!(val & UART_IR_STAT(UART_IR_TXEMPTY)))
- return -EAGAIN;
-
- writel(ch, priv->base + UART_FIFO_REG);
-
- return 0;
-}
-
-static int bcm6858_serial_getc(struct udevice *dev)
-{
- struct bcm6858_serial_priv *priv = dev_get_priv(dev);
- u32 val;
-
- val = readl(priv->base + UART_IR_REG);
- if (val & UART_IR_STAT(UART_IR_RXOVER))
- setbits_le32(priv->base + UART_CTL_REG,
- UART_CTL_RSTRXFIFO_MASK);
-
- if (!(val & UART_IR_STAT(UART_IR_RXNOTEMPTY)))
- return -EAGAIN;
-
- val = readl(priv->base + UART_FIFO_REG);
- if (val & UART_FIFO_ANYERR_MASK)
- return -EAGAIN;
-
- return val & UART_FIFO_VALID_MASK;
-}
-
-static int bcm6858_serial_probe(struct udevice *dev)
-{
- struct bcm6858_serial_priv *priv = dev_get_priv(dev);
- struct clk clk;
- int ret;
-
- /* get address */
- priv->base = dev_remap_addr(dev);
- if (!priv->base)
- return -EINVAL;
-
- /* get clock rate */
- ret = clk_get_by_index(dev, 0, &clk);
- if (ret < 0)
- return ret;
- priv->uartclk = clk_get_rate(&clk);
- clk_free(&clk);
-
- /* initialize serial */
- return bcm6858_serial_init(priv->base, priv->uartclk, CONFIG_BAUDRATE);
-}
-
-static const struct dm_serial_ops bcm6858_serial_ops = {
- .putc = bcm6858_serial_putc,
- .pending = bcm6858_serial_pending,
- .getc = bcm6858_serial_getc,
- .setbrg = bcm6858_serial_setbrg,
-};
-
-static const struct udevice_id bcm6858_serial_ids[] = {
- { .compatible = "brcm,bcm6858-uart" },
- { /* sentinel */ }
-};
-
-U_BOOT_DRIVER(bcm6858_serial) = {
- .name = "bcm6858-uart",
- .id = UCLASS_SERIAL,
- .of_match = bcm6858_serial_ids,
- .probe = bcm6858_serial_probe,
- .priv_auto_alloc_size = sizeof(struct bcm6858_serial_priv),
- .ops = &bcm6858_serial_ops,
- .flags = DM_FLAG_PRE_RELOC,
-};
-
-#ifdef CONFIG_DEBUG_UART_BCM6858
-static inline void _debug_uart_init(void)
-{
- void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
-
- bcm6858_serial_init(base, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE);
-}
-
-static inline void wait_xfered(void __iomem *base)
-{
- do {
- u32 val = readl(base + UART_IR_REG);
- if (val & UART_IR_STAT(UART_IR_TXEMPTY))
- break;
- } while (1);
-}
-
-static inline void _debug_uart_putc(int ch)
-{
- void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE;
-
- wait_xfered(base);
- writel(ch, base + UART_FIFO_REG);
- wait_xfered(base);
-}
-
-DEBUG_UART_FUNCS
-#endif
projects / platform / kernel / u-boot.git / commitdiff