From 3058104056f4d3b9ca382d64fd5f73fc16aa5590 Mon Sep 17 00:00:00 2001 From: Álvaro Fernández Rojas Date: Tue, 25 Apr 2017 00:39:16 +0200 Subject: serial: add serial driver for BCM6345 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit It is based on linux/drivers/tty/serial/bcm63xx_uart.c Signed-off-by: Álvaro Fernández Rojas Reviewed-by: Simon Glass --- drivers/serial/Kconfig | 14 ++ drivers/serial/Makefile | 1 + drivers/serial/serial_bcm6345.c | 300 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 315 insertions(+) create mode 100644 drivers/serial/serial_bcm6345.c (limited to 'drivers/serial') diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index 58320666b7..724994568d 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -145,6 +145,14 @@ config DEBUG_UART_ATMEL will need to provide parameters to make this work. The driver will be available until the real driver-model serial is running. +config DEBUG_UART_BCM6345 + bool "BCM6345 UART" + depends on BCM6345_SERIAL + help + Select this to enable a debug UART on BCM6345 SoCs. You + will need to provide parameters to make this work. The driver will + be available until the real driver model serial is running. + config DEBUG_UART_NS16550 bool "ns16550" help @@ -350,6 +358,12 @@ config ATMEL_USART configured in the device tree, and input clock frequency can be got from the clk node. +config BCM6345_SERIAL + bool "Support for BCM6345 UART" + depends on DM_SERIAL && ARCH_BMIPS + help + Select this to enable UART on BCM6345 SoCs. + config FSL_LPUART bool "Freescale LPUART support" help diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 4382cf9329..dca31b295c 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_ALTERA_JTAG_UART) += altera_jtag_uart.o obj-$(CONFIG_AR933X_UART) += serial_ar933x.o obj-$(CONFIG_ARM_DCC) += arm_dcc.o obj-$(CONFIG_ATMEL_USART) += atmel_usart.o +obj-$(CONFIG_BCM6345_SERIAL) += serial_bcm6345.o obj-$(CONFIG_EFI_APP) += serial_efi.o obj-$(CONFIG_LPC32XX_HSUART) += lpc32xx_hsuart.o obj-$(CONFIG_MCFUART) += mcfuart.o diff --git a/drivers/serial/serial_bcm6345.c b/drivers/serial/serial_bcm6345.c new file mode 100644 index 0000000000..db270e3b21 --- /dev/null +++ b/drivers/serial/serial_bcm6345.c @@ -0,0 +1,300 @@ +/* + * Copyright (C) 2017 Álvaro Fernández Rojas + * + * Derived from linux/drivers/tty/serial/bcm63xx_uart.c: + * Copyright (C) 2008 Maxime Bizon + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include +#include +#include +#include + +/* 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 bcm6345_serial_priv { + void __iomem *base; + ulong uartclk; +}; + +/* enable rx & tx operation on uart */ +static void bcm6345_serial_enable(void __iomem *base) +{ + setbits_be32(base + UART_CTL_REG, UART_CTL_BRGEN_MASK | + UART_CTL_TXEN_MASK | UART_CTL_RXEN_MASK); +} + +/* disable rx & tx operation on uart */ +static void bcm6345_serial_disable(void __iomem *base) +{ + clrbits_be32(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 bcm6345_serial_flush(void __iomem *base) +{ + /* empty rx and tx fifo */ + setbits_be32(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_be(base + UART_FIFO_REG); +} + +static int bcm6345_serial_init(void __iomem *base, ulong clk, u32 baudrate) +{ + u32 val; + + /* mask all irq and flush port */ + bcm6345_serial_disable(base); + bcm6345_serial_flush(base); + + /* set uart control config */ + clrsetbits_be32(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 parity to even */ + UART_CTL_RXPAREVEN_MASK | + UART_CTL_TXPAREVEN_MASK); + + /* set uart fifo config */ + clrsetbits_be32(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) / 16; + if (val & 0x1) + val = val; + else + val = val / 2 - 1; + writel_be(val, base + UART_BAUD_REG); + + /* clear interrupts */ + writel_be(0, base + UART_IR_REG); + + /* enable uart */ + bcm6345_serial_enable(base); + + return 0; +} + +static int bcm6345_serial_pending(struct udevice *dev, bool input) +{ + struct bcm6345_serial_priv *priv = dev_get_priv(dev); + u32 val = readl_be(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 bcm6345_serial_setbrg(struct udevice *dev, int baudrate) +{ + struct bcm6345_serial_priv *priv = dev_get_priv(dev); + + return bcm6345_serial_init(priv->base, priv->uartclk, baudrate); +} + +static int bcm6345_serial_putc(struct udevice *dev, const char ch) +{ + struct bcm6345_serial_priv *priv = dev_get_priv(dev); + u32 val; + + val = readl_be(priv->base + UART_IR_REG); + if (!(val & UART_IR_STAT(UART_IR_TXEMPTY))) + return -EAGAIN; + + writel_be(ch, priv->base + UART_FIFO_REG); + + return 0; +} + +static int bcm6345_serial_getc(struct udevice *dev) +{ + struct bcm6345_serial_priv *priv = dev_get_priv(dev); + u32 val; + + val = readl_be(priv->base + UART_IR_REG); + if (val & UART_IR_STAT(UART_IR_RXOVER)) + setbits_be32(priv->base + UART_CTL_REG, + UART_CTL_RSTRXFIFO_MASK); + if (!(val & UART_IR_STAT(UART_IR_RXNOTEMPTY))) + return -EAGAIN; + + val = readl_be(priv->base + UART_FIFO_REG); + if (val & UART_FIFO_ANYERR_MASK) + return -EAGAIN; + + return val & UART_FIFO_VALID_MASK; +} + +static int bcm6345_serial_probe(struct udevice *dev) +{ + struct bcm6345_serial_priv *priv = dev_get_priv(dev); + struct clk clk; + fdt_addr_t addr; + fdt_size_t size; + int ret; + + /* get address */ + addr = dev_get_addr_size_index(dev, 0, &size); + if (addr == FDT_ADDR_T_NONE) + return -EINVAL; + + priv->base = ioremap(addr, size); + + /* get clock rate */ + ret = clk_get_by_index(dev, 0, &clk); + if (ret < 0) + return ret; + priv->uartclk = clk_get_rate(&clk) / 2; + clk_free(&clk); + + /* initialize serial */ + return bcm6345_serial_init(priv->base, priv->uartclk, CONFIG_BAUDRATE); +} + +static const struct dm_serial_ops bcm6345_serial_ops = { + .putc = bcm6345_serial_putc, + .pending = bcm6345_serial_pending, + .getc = bcm6345_serial_getc, + .setbrg = bcm6345_serial_setbrg, +}; + +static const struct udevice_id bcm6345_serial_ids[] = { + { .compatible = "brcm,bcm6345-uart" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(bcm6345_serial) = { + .name = "bcm6345-uart", + .id = UCLASS_SERIAL, + .of_match = bcm6345_serial_ids, + .probe = bcm6345_serial_probe, + .priv_auto_alloc_size = sizeof(struct bcm6345_serial_priv), + .ops = &bcm6345_serial_ops, + .flags = DM_FLAG_PRE_RELOC, +}; + +#ifdef CONFIG_DEBUG_UART_BCM6345 +static inline void _debug_uart_init(void) +{ + void __iomem *base = (void __iomem *)CONFIG_DEBUG_UART_BASE; + + bcm6345_serial_init(base, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE); +} + +static inline void wait_xfered(void __iomem *base) +{ + do { + u32 val = readl_be(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_be(ch, base + UART_FIFO_REG); + wait_xfered(base); +} + +DEBUG_UART_FUNCS +#endif -- cgit