[PATCH 4/4] serial: serial_cortina: add UART DM driver for CAxxxx SoCs
Daniel Schwierzeck
daniel.schwierzeck at gmail.com
Mon Jan 20 16:27:29 CET 2020
Am 20.01.20 um 10:53 schrieb Alex Nemirovsky:
> From: Jason Li <jason.li at cortina-access.com>
>
> Add serial UART driver support for all Cortina Access
> CAxxxx family of SoCs.
>
> Signed-off-by: Jason Li <jason.li at cortina-access.com>
> Signed-off-by: Alex Nemirovsky <alex.nemirovsky at cortina-access.com>
> ---
>
> MAINTAINERS | 4 ++
> drivers/serial/Kconfig | 7 +++
> drivers/serial/Makefile | 2 +-
> drivers/serial/serial_cortina.c | 129 ++++++++++++++++++++++++++++++++++++++++
> drivers/serial/serial_cortina.h | 83 ++++++++++++++++++++++++++
> 5 files changed, 224 insertions(+), 1 deletion(-)
> create mode 100644 drivers/serial/serial_cortina.c
> create mode 100644 drivers/serial/serial_cortina.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index f9334f9..2b3282b 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -181,6 +181,8 @@ F: board/cortina/common/Kconfig
> F: board/cortina/common/armv8/lowlevel_init.S
> F: drivers/gpio/cortina_gpio.c
> F: drivers/watchdog/cortina_wdt.c
> +F: drivers/serial/serial_cortina.c
> +F: drivers/serial/serial_cortina.h
>
> ARM/CZ.NIC TURRIS MOX SUPPORT
> M: Marek Behun <marek.behun at nic.cz>
> @@ -664,6 +666,8 @@ F: board/cortina/common/Kconfig
> F: board/cortina/common/mips/*
> F: drivers/gpio/cortina_gpio.c
> F: drivers/watchdog/cortina_wdt.c
> +F: drivers/serial/serial_cortina.c
> +F: drivers/serial/serial_cortina.h
>
> MIPS MSCC
> M: Gregory CLEMENT <gregory.clement at bootlin.com>
> 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..2b52e5d
> --- /dev/null
> +++ b/drivers/serial/serial_cortina.c
> @@ -0,0 +1,129 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * (C) Copyright 2020
> + * Cortina-Access Ltd.
> + * Author: Jason Li <jason.li at cortina-access.com>
> + *
> + */
> +
> +/* Common UART Driver for Cortina Access CAxxxx line of SoCs */
same comment as in patch 2/4. There shouldn't be a separate comment
block for the description.
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <errno.h>
> +#include <watchdog.h>
> +#include <asm/io.h>
> +#include <serial.h>
> +#include <linux/compiler.h>
> +#include "serial_cortina.h"
> +
> +#define IO_WRITE(addr, val) (*(unsigned int *)(addr) = (val))
> +#define IO_READ(addr) (*(unsigned int *)(addr))
dead code, you should use the standard I/O accessors anyway
> +
> +#ifdef CONFIG_DM_SERIAL
this ifdef is superfluous because without DM_SERIAL the whole file won't
be built at all
> +
> +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 |= (baud << 8);
> + writel(uart_ctrl, priv->base + UCFG);
setbits_32() ?
> +
> + 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);
> + while (status & UINFO_TX_FIFO_FULL)
> + status = readl(priv->base + UINFO);
this function must not block because retry handling is done by the
serial core. If the TX FIFO is full, simply 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 (status & UINFO_RX_FIFO_EMPTY) /* empty */
> + return 0;
> + else /* something in RX FIFO */
> + return 1;
this function has to check TX and RX FIFO dependent on parameter "input"
> +}
> +
> +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);
> + fdt_addr_t addr;
> +
> + addr = dev_read_addr(dev);
> + if (addr == FDT_ADDR_T_NONE)
> + return -EINVAL;
> + priv->base = map_physmem(addr, 0, MAP_NOCACHE);
dev_remap_addr_index() ?
> +
> + 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,};
there should be one assignment per line
> +#endif /* CONFIG_DM_SERIAL */
> diff --git a/drivers/serial/serial_cortina.h b/drivers/serial/serial_cortina.h
> new file mode 100644
> index 0000000..19448f2
> --- /dev/null
> +++ b/drivers/serial/serial_cortina.h
> @@ -0,0 +1,83 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * u-boot/drivers/serial/serial_cortina.h
> + *
> + * Copyright (c) Cortina-Systems Limited 2020. All rights reserved.
> + * Jason Li <jason.li at cortina-systems.com>
> + *
> + */
> +
> +#ifndef _SERIAL_CORTINA_H_
> +#define _SERIAL_CORTINA_H_
> +
> +/*
> + * UART Module for Cortina Access CAxxxx line of SoCs
> + */
> +#define UART0_BASE_ADDR CONFIG_SYS_SERIAL0
> +#define UART1_BASE_ADDR CONFIG_SYS_SERIAL1
> +
> +#define CONFIG_CONS_INDEX 0
> +
> +/* 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 BIT(8)
> +#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
> +
> +/* UART CONF bits */
> +#define SHF_UCONF_WL 0
> +#define MSK_UCONF_WL (0x3 << SHF_UCONF_WL)
> +#define VAL_UCONF_WL_5 (0x0 << SHF_UCONF_WL)
> +#define VAL_UCONF_WL_6 (0x1 << SHF_UCONF_WL)
> +#define VAL_UCONF_WL_7 (0x2 << SHF_UCONF_WL)
> +#define VAL_UCONF_WL_8 (0x3 << SHF_UCONF_WL)
> +
> +#define SHF_UCONF_SB 2
> +#define MSK_UCONF_SB (0x1 << SHF_UCONF_SB)
> +#define VAL_UCONF_SB_1 (0x0 << SHF_UCONF_SB)
> +#define VAL_UCONF_SB_2 (0x1 << SHF_UCONF_SB)
> +
> +#define SHF_UCONF_PM 3
> +#define MSK_UCONF_PM (0x3 << SHF_UCONF_PM)
> +#define VAL_UCONF_PM_N (0x0 << SHF_UCONF_PM)
> +#define VAL_UCONF_PM_O (0x2 << SHF_UCONF_PM)
> +#define VAL_UCONF_PM_E (0x3 << SHF_UCONF_PM)
this file should be dropped. You only need add the required register
definitions to serial_cortina.c
> +
> +#endif /* _SERIAL_CORTINA_H_ */
>
--
- Daniel
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