From: Jason Li jason.li@cortina-access.com
Add serial UART driver support for all Cortina Access CAxxxx family of SoCs.
Reviewed-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com Signed-off-by: Jason Li jason.li@cortina-access.com Signed-off-by: Alex Nemirovsky alex.nemirovsky@cortina-access.com
---
Changes in v4: None Changes in v3: - clean up comment blocks - fix rmw of baud rate bitfield change
Changes in v2: - Rename driver in DT namespace for consistency between all CA drivers. - Remove blank line after SPDX identifier - Remove authorship comment as it is already recorded within Git and is redundant - Merge serial_cortina.h reg defines into serial_cortina.c - Modify ca_serial_pending() and API to get resource.
drivers/serial/Kconfig | 7 ++ drivers/serial/Makefile | 2 +- drivers/serial/serial_cortina.c | 164 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 172 insertions(+), 1 deletion(-) create mode 100644 drivers/serial/serial_cortina.c
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index ece7d87..9f76596 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -539,6 +539,13 @@ config BCM6345_SERIAL help Select this to enable UART on BCM6345 SoCs.
+config CORTINA_UART + bool "Cortina UART support" + depends on DM_SERIAL + help + Select this to enable UART support for Cortina-Access UART devices + found on CAxxxx SoCs. + config FSL_LINFLEXUART bool "Freescale Linflex UART support" depends on DM_SERIAL diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index 06ee306..c8f2db4 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -28,13 +28,13 @@ obj-$(CONFIG_PL010_SERIAL) += serial_pl01x.o obj-$(CONFIG_PL011_SERIAL) += serial_pl01x.o obj-$(CONFIG_SYS_NS16550_SERIAL) += serial_ns16550.o endif - obj-$(CONFIG_ALTERA_UART) += altera_uart.o 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_CORTINA_UART) += serial_cortina.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_cortina.c b/drivers/serial/serial_cortina.c new file mode 100644 index 0000000..4f227bf --- /dev/null +++ b/drivers/serial/serial_cortina.c @@ -0,0 +1,164 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2020 Cortina-Access Ltd. + * Common UART Driver for Cortina Access CAxxxx line of SoCs + * + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <watchdog.h> +#include <asm/io.h> +#include <serial.h> +#include <linux/compiler.h> + +/* Register definitions */ +#define UCFG 0x00 /* UART config register */ +#define UFC 0x04 /* Flow Control */ +#define URX_SAMPLE 0x08 /* UART RX Sample register */ +#define URT_TUNE 0x0C /* Fine tune of UART clk */ +#define UTX_DATA 0x10 /* UART TX Character data */ +#define URX_DATA 0x14 /* UART RX Character data */ +#define UINFO 0x18 /* UART Info */ +#define UINT_EN0 0x1C /* UART Interrupt enable 0 */ +#define UINT_EN1 0x20 /* UART Interrupt enable 1 */ +#define UINT0 0x24 /* UART Interrupt 0 setting/clearing */ +#define UINT1 0x28 /* UART Interrupt 1 setting/clearing */ +#define UINT_STAT 0x2C /* UART Interrupt Status */ + +/* UART Control Register Bit Fields */ +#define UCFG_BAUD_COUNT_MASK 0xFFFFFF00 +#define UCFG_BAUD_COUNT(x) ((x << 8) & UCFG_BAUD_COUNT_MASK) +#define UCFG_EN BIT(7) +#define UCFG_RX_EN BIT(6) +#define UCFG_TX_EN BIT(5) +#define UCFG_PARITY_EN BIT(4) +#define UCFG_PARITY_SEL BIT(3) +#define UCFG_2STOP_BIT BIT(2) +#define UCFG_CNT1 BIT(1) +#define UCFG_CNT0 BIT(0) +#define UCFG_CHAR_5 0 +#define UCFG_CHAR_6 1 +#define UCFG_CHAR_7 2 +#define UCFG_CHAR_8 3 + +#define UINFO_TX_FIFO_EMPTY BIT(3) +#define UINFO_TX_FIFO_FULL BIT(2) +#define UINFO_RX_FIFO_EMPTY BIT(1) +#define UINFO_RX_FIFO_FULL BIT(0) + +#define UINT_RX_NON_EMPTY BIT(6) +#define UINT_TX_EMPTY BIT(5) +#define UINT_RX_UNDERRUN BIT(4) +#define UINT_RX_OVERRUN BIT(3) +#define UINT_RX_PARITY_ERR BIT(2) +#define UINT_RX_STOP_ERR BIT(1) +#define UINT_TX_OVERRUN BIT(0) +#define UINT_MASK_ALL 0x7F + +struct ca_uart_priv { + void __iomem *base; +}; + +int ca_serial_setbrg(struct udevice *dev, int baudrate) +{ + struct ca_uart_priv *priv = dev_get_priv(dev); + unsigned int uart_ctrl, baud, sample; + + baud = CORTINA_UART_CLOCK / baudrate; + + uart_ctrl = readl(priv->base + UCFG); + uart_ctrl &= ~UCFG_BAUD_COUNT_MASK; + uart_ctrl |= UCFG_BAUD_COUNT(baud); + writel(uart_ctrl, priv->base + UCFG); + + sample = baud / 2; + sample = (sample < 7) ? 7 : sample; + writel(sample, priv->base + URX_SAMPLE); + + return 0; +} + +static int ca_serial_getc(struct udevice *dev) +{ + struct ca_uart_priv *priv = dev_get_priv(dev); + int ch; + + ch = readl(priv->base + URX_DATA) & 0xFF; + + return (int)ch; +} + +static int ca_serial_putc(struct udevice *dev, const char ch) +{ + struct ca_uart_priv *priv = dev_get_priv(dev); + unsigned int status; + + /* Retry if TX FIFO full */ + status = readl(priv->base + UINFO); + if (status & UINFO_TX_FIFO_FULL) + return -EAGAIN; + + writel(ch, priv->base + UTX_DATA); + + return 0; +} + +static int ca_serial_pending(struct udevice *dev, bool input) +{ + struct ca_uart_priv *priv = dev_get_priv(dev); + unsigned int status; + + status = readl(priv->base + UINFO); + + if (input) + return (status & UINFO_RX_FIFO_EMPTY) ? 0 : 1; + else + return (status & UINFO_TX_FIFO_FULL) ? 1 : 0; +} + +static int ca_serial_probe(struct udevice *dev) +{ + struct ca_uart_priv *priv = dev_get_priv(dev); + u32 uart_ctrl; + + /* Set data, parity and stop bits */ + uart_ctrl = UCFG_EN | UCFG_TX_EN | UCFG_RX_EN | UCFG_CHAR_8; + writel(uart_ctrl, priv->base + UCFG); + + return 0; +} + +static int ca_serial_ofdata_to_platdata(struct udevice *dev) +{ + struct ca_uart_priv *priv = dev_get_priv(dev); + + priv->base = dev_remap_addr_index(dev, 0); + if (!priv->base) + return -ENOENT; + + return 0; +} + +static const struct dm_serial_ops ca_serial_ops = { + .putc = ca_serial_putc, + .pending = ca_serial_pending, + .getc = ca_serial_getc, + .setbrg = ca_serial_setbrg, +}; + +static const struct udevice_id ca_serial_ids[] = { + {.compatible = "cortina,ca-uart"}, + {} +}; + +U_BOOT_DRIVER(serial_cortina) = { + .name = "serial_cortina", + .id = UCLASS_SERIAL, + .of_match = ca_serial_ids, + .ofdata_to_platdata = ca_serial_ofdata_to_platdata, + .priv_auto_alloc_size = sizeof(struct ca_uart_priv), + .probe = ca_serial_probe, + .ops = &ca_serial_ops +};