[PATCH 4/4] serial: serial_cortina: add UART DM driver for CAxxxx SoCs

Alex Nemirovsky Alex.Nemirovsky at cortina-access.com
Mon Jan 20 10:53:47 CET 2020


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 */
+
+#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))
+
+#ifdef CONFIG_DM_SERIAL
+
+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);
+
+	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);
+
+	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;
+}
+
+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);
+
+	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,};
+#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)
+
+#endif /* _SERIAL_CORTINA_H_ */
-- 
2.7.4



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