[PATCH 7/7] tty/serial: add asm9260-serial driver
Oleksij Rempel
linux at rempel-privat.de
Sat Sep 13 15:13:28 PDT 2014
Signed-off-by: Oleksij Rempel <linux at rempel-privat.de>
---
drivers/tty/serial/Kconfig | 19 +
drivers/tty/serial/Makefile | 1 +
drivers/tty/serial/asm9260_serial.c | 1236 +++++++++++++++++++++++++++++++++++
include/uapi/linux/serial_core.h | 2 +
4 files changed, 1258 insertions(+)
create mode 100644 drivers/tty/serial/asm9260_serial.c
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index fb57159..02adb75 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1552,6 +1552,25 @@ config SERIAL_MEN_Z135
This driver can also be build as a module. If so, the module will be called
men_z135_uart.ko
+config SERIAL_ASM9260
+ tristate "ASM9260 controller serial support"
+ depends on MACH_ASM9260
+ select SERIAL_CORE
+ help
+ If you have an asm9260 based Base IO card
+ and wish to use the serial ports on this card, say Y.
+ Otherwise, say N.
+
+config SERIAL_ASM9260_CONSOLE
+ bool "ASM9260 console support"
+ depends on SERIAL_ASM9260
+ select SERIAL_CORE_CONSOLE
+ help
+ If you want to support serial console on borad asm9260
+ say Y. Otherwise, say N.
+
+source "arch/arm/mach-asm9260/Kconfig"
+
endmenu
config SERIAL_MCTRL_GPIO
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 0080cc3..80940d4 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -95,3 +95,4 @@ obj-$(CONFIG_SERIAL_MEN_Z135) += men_z135_uart.o
# GPIOLIB helpers for modem control lines
obj-$(CONFIG_SERIAL_MCTRL_GPIO) += serial_mctrl_gpio.o
+obj-$(CONFIG_SERIAL_ASM9260) += asm9260_serial.o
diff --git a/drivers/tty/serial/asm9260_serial.c b/drivers/tty/serial/asm9260_serial.c
new file mode 100644
index 0000000..1d18439
--- /dev/null
+++ b/drivers/tty/serial/asm9260_serial.c
@@ -0,0 +1,1236 @@
+/*
+ * asm9260_serial.c Alpscale ASM9260 UART driver
+ *
+ * Mostly rewritten with irq_thread, clk and DT suppor:
+ * Copyright (C) 2014 Oleksij Rempel <linux at rempel-privat.de>
+ *
+ * 2014 Cleaned by Du Huanpeng <u74147 at gmail.com>
+ *
+ * Copyright (C) 2013, Alpscale Tech. Co., Ltd.
+ * Initial code has been inspired/copied from atmel_serial.c (kernel v2.4) and
+ * adopted for asm9260 (kernel v2.4) by Chen Dongdong.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/console.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/serial_core.h>
+#include <linux/tty_flip.h>
+
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+
+#define SERIAL_ASM9260_MAJOR 204
+#define MINOR_START 64
+#define ASM9260_DEVICENAME "ttyS"
+#define DRIVER_NAME "asm9260_uart"
+#define ASM9260_UART_FIFOSIZE 16
+#define ASM9260_BUS_RATE 100000000
+#define ASM9260_MAX_UART 10
+
+#define UART_BAUD_DIVINT_MASK ((unsigned int)0x003FFFC0)
+#define UART_BAUD_DIVFRAC_MASK ((unsigned int)0x0000003F)
+#define UART_BAUD_DIV_MAX 0x3FFFFF
+
+#define SET_REG 0x4
+#define CLR_REG 0x8
+
+#define HW_CTRL0 0x00
+#define BM_CTRL0_RXTO_SOURCE_STATUS BIT(25)
+#define BM_CTRL0_RXTO_ENABLE BIT(24)
+#define BM_CTRL0_RXTO_MASK (0xFF<<16)
+#define BM_CTRL0_DEFAULT_RXTIMEOUT (20<<16) /* TIMEOUT = (100*7+1)*(1/BAUD) */
+
+#define HW_CTRL1 0x10
+
+#define HW_CTRL2 0x20
+#define BM_CTRL2_CTSE BIT(15)
+#define BM_CTRL2_RTSE BIT(14)
+#define BM_CTRL2_RXE BIT(9)
+#define BM_CTRL2_TXE BIT(8)
+#define BM_CTRL2_LBE BIT(7)
+#define BM_CTRL2_PORT_ENABLE BIT(0)
+#define BM_CTRL2_TXIFLSEL (7<<16)
+#define BM_CTRL2_RXIFLSEL (7<<20)
+#define BM_CTRL2_DEFAULT_TXIFLSEL (2<<16)
+#define BM_CTRL2_DEFAULT_RXIFLSEL (3<<20)
+
+#define HW_LINECTRL 0x30
+#define BM_LCTRL_BAUD_DIVINT (0xFFFF<<16)
+#define BM_LCTRL_BAUD_DIVFRA (0x3F<<8)
+#define BM_LCTRL_SPS BIT(7)
+#define BM_LCTRL_WLEN (3<<5)
+#define BM_LCTRL_FEN BIT(4)
+#define BM_LCTRL_STP2 BIT(3)
+#define BM_LCTRL_EPS BIT(2)
+#define BM_LCTRL_PEN BIT(1)
+#define BM_LCTRL_BREAK BIT(0)
+#define BM_LCTRL_CHRL_5 (0<<5)
+#define BM_LCTRL_CHRL_6 (1<<5)
+#define BM_LCTRL_CHRL_7 (2<<5)
+#define BM_LCTRL_CHRL_8 (3<<5)
+#define BM_LCTRL_NBSTOP_1 (0<<3)
+#define BM_LCTRL_NBSTOP_2 (1<<3)
+#define BM_LCTRL_PAR_MARK ((3<<1) | (1<<7))
+#define BM_LCTRL_PAR_SPACE ((1<<1) | (1<<7))
+#define BM_LCTRL_PAR_ODD ((1<<1) | (0<<7))
+#define BM_LCTRL_PAR_EVEN ((3<<1) | (0<<7))
+#define BM_LCTRL_PAR_NONE (0<<1)
+
+/* Interrupt register.
+ * contains the interrupt enables and the interrupt status bits */
+#define HW_INTR 0x40
+/* Tx FIFO EMPTY Raw Interrupt enable */
+#define BM_INTR_TFEIEN BIT(27)
+/* Overrun Error Interrupt Enable. */
+#define BM_INTR_OEIEN BIT(26)
+/* Break Error Interrupt Enable. */
+#define BM_INTR_BEIEN BIT(25)
+/* Parity Error Interrupt Enable. */
+#define BM_INTR_PEIEN BIT(24)
+/* Framing Error Interrupt Enable. */
+#define BM_INTR_FEIEN BIT(23)
+/* Receive Timeout Interrupt Enable.
+ * If not set and FIFO is enabled, then RX will be triggered only
+ * if FIFO is full. */
+#define BM_INTR_RTIEN BIT(22)
+/* Transmit Interrupt Enable. */
+#define BM_INTR_TXIEN BIT(21)
+/* Receive Interrupt Enable. */
+#define BM_INTR_RXIEN BIT(20)
+/* nUARTDSR Modem Interrupt Enable. */
+#define BM_INTR_DSRMIEN BIT(19)
+/* nUARTDCD Modem Interrupt Enable. */
+#define BM_INTR_DCDMIEN BIT(18)
+/* nUARTCTS Modem Interrupt Enable. */
+#define BM_INTR_CTSMIEN BIT(17)
+/* nUARTRI Modem Interrupt Enable. */
+#define BM_INTR_RIMIEN BIT(16)
+/* Auto-Boud Timeout */
+#define BM_INTR_ABTO BIT(13)
+#define BM_INTR_ABEO BIT(12)
+/* Tx FIFO EMPTY Raw Interrupt state */
+#define BM_INTR_TFEIS BIT(11)
+/* Overrun Error */
+#define BM_INTR_OEIS BIT(10)
+/* Break Error */
+#define BM_INTR_BEIS BIT(9)
+/* Parity Error */
+#define BM_INTR_PEIS BIT(8)
+/* Framing Error */
+#define BM_INTR_FEIS BIT(7)
+/* Receive Timeout */
+#define BM_INTR_RTIS BIT(6)
+/* Transmit done */
+#define BM_INTR_TXIS BIT(5)
+/* Receive done */
+#define BM_INTR_RXIS BIT(4)
+#define BM_INTR_DSRMIS BIT(3)
+#define BM_INTR_DCDMIS BIT(2)
+#define BM_INTR_CTSMIS BIT(1)
+#define BM_INTR_RIMIS BIT(0)
+
+
+#define BM_INTR_DEF_MASK (BM_INTR_RXIEN | BM_INTR_TXIEN | BM_INTR_RTIEN \
+ | BM_INTR_FEIEN | BM_INTR_PEIEN | BM_INTR_BEIEN | BM_INTR_OEIEN)
+
+#define BM_INTR_DEF_IS_MASK (BM_INTR_DEF_MASK >> 16)
+#define BM_INTR_EN_MASK (0x3fff0000)
+#define BM_INTR_IS_MASK (0x00003fff)
+
+#define HW_DATA 0x50
+
+#define HW_STAT 0x60
+#define BM_STAT_BUSY BIT(29)
+#define BM_STAT_CTS BIT(28)
+#define BM_STAT_TXEMPTY BIT(27)
+#define BM_STAT_RXFULL BIT(26)
+#define BM_STAT_TXFULL BIT(25)
+#define BM_STAT_RXEMPTY BIT(24)
+#define BM_STAT_OVERRUNERR BIT(19)
+#define BM_STAT_BREAKERR BIT(18)
+#define BM_STAT_PARITYERR BIT(17)
+#define BM_STAT_FRAMEERR BIT(16)
+
+#define HW_ILPR 0x80
+
+#define HW_RS485CTRL 0x90
+#define BM_RS485CTRL_RS485EN BIT(0)
+#define BM_RS485CTRL_RXDIS BIT(1)
+#define BM_RS485CTRL_AADEN BIT(2)
+#define BM_RS485CTRL_PINSEL BIT(3)
+#define BM_RS485CTRL_DIR_CTRL BIT(4)
+#define BM_RS485CTRL_ONIV BIT(5)
+
+#define HW_RS485ADRMATCH 0xA0
+#define HW_RS485DLY 0xB0
+#define HW_AUTOBAUD 0xC0
+#define HW_CTRL3 0xD0
+
+
+/*
+ * We wrap our port structure around the generic uart_port.
+ */
+struct asm9260_uart_port {
+ struct uart_port uart; /* uart */
+ struct clk *clk; /* uart clock */
+ struct clk *clk_ahb;
+ int clk_on;
+
+ struct serial_rs485 rs485; /* rs485 settings */
+
+ uint32_t intmask;
+ int init_ok;
+};
+
+static struct asm9260_uart_port *asm9260_ports;
+static int asm9260_ports_num;
+
+static void asm9260_start_rx(struct uart_port *uport);
+static void asm9260_tx_chars(struct uart_port *uport);
+static int asm9260_get_of_clks(struct asm9260_uart_port *port,
+ struct device_node *np);
+static void asm9260_enable_clks(struct asm9260_uart_port *port);
+static void asm9260_uart_of_enumerate(void);
+
+static inline struct asm9260_uart_port *
+to_asm9260_uart_port(struct uart_port *uart)
+{
+ return container_of(uart, struct asm9260_uart_port, uart);
+}
+
+static inline void asm9260_intr_mask(struct uart_port *uport)
+{
+ iowrite32(BM_INTR_DEF_MASK,
+ uport->membase + HW_INTR + CLR_REG);
+}
+
+static inline void asm9260_intr_unmask(struct uart_port *uport)
+{
+ iowrite32(BM_INTR_DEF_MASK,
+ uport->membase + HW_INTR + SET_REG);
+}
+
+/*
+ * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
+ */
+static u_int asm9260_tx_empty(struct uart_port *uport)
+{
+ return (ioread32(uport->membase + HW_STAT)
+ & BM_STAT_TXEMPTY) ? TIOCSER_TEMT : 0;
+}
+
+static void asm9260_set_mctrl(struct uart_port *uport, u_int mctrl)
+{
+}
+
+static u_int asm9260_get_mctrl(struct uart_port *uport)
+{
+ return 0;
+}
+
+/*
+ * Stop transmitting.
+ */
+static void asm9260_stop_tx(struct uart_port *uport)
+{
+ struct asm9260_uart_port *asm9260_port = to_asm9260_uart_port(uport);
+
+ /* seems like it was take over from atmel_serial.c
+ * do we need it too? */
+ if ((asm9260_port->rs485.flags & SER_RS485_ENABLED) &&
+ !(asm9260_port->rs485.flags & SER_RS485_RX_DURING_TX))
+ asm9260_start_rx(uport);
+}
+
+static void asm9260_start_tx(struct uart_port *uport)
+{
+ asm9260_tx_chars(uport);
+}
+
+static void asm9260_start_rx(struct uart_port *uport)
+{
+ /* enable receive */
+ iowrite32(BM_CTRL2_RXE,
+ uport->membase + HW_CTRL2 + SET_REG);
+}
+
+static void asm9260_stop_rx(struct uart_port *uport)
+{
+ /* disable receive */
+ iowrite32(BM_CTRL2_RXE,
+ uport->membase + HW_CTRL2 + CLR_REG);
+}
+
+static void asm9260_enable_ms(struct uart_port *uport)
+{
+}
+
+/*
+ * Control the transmission of a break signal
+ */
+static void asm9260_break_ctl(struct uart_port *uport, int break_state)
+{
+ if (break_state != 0)
+ iowrite32(BM_LCTRL_BREAK,
+ uport->membase + HW_LINECTRL + SET_REG);
+ else
+ iowrite32(BM_LCTRL_BREAK,
+ uport->membase + HW_LINECTRL + CLR_REG);
+}
+
+static void asm9260_rx_chars(struct uart_port *uport, unsigned int intr)
+{
+ unsigned int status, ch;
+
+ status = ioread32(uport->membase + HW_STAT);
+ while (!(status & BM_STAT_RXEMPTY)) {
+ unsigned int flg;
+ ch = ioread32(uport->membase + HW_DATA);
+
+ uport->icount.rx++;
+ flg = TTY_NORMAL;
+
+ if (unlikely(intr & (BM_INTR_PEIS | BM_INTR_FEIS
+ | BM_INTR_OEIS | BM_INTR_BEIS))) {
+
+ /* clear error */
+ iowrite32(0, uport->membase + HW_STAT);
+
+ if (intr & BM_INTR_BEIS) {
+ uport->icount.brk++;
+ if (uart_handle_break(uport))
+ continue;
+ } else if (intr & BM_INTR_PEIS)
+ uport->icount.parity++;
+ else if (intr & BM_INTR_FEIS)
+ uport->icount.frame++;
+
+ if (intr & BM_INTR_OEIS)
+ uport->icount.overrun++;
+
+ intr &= uport->read_status_mask;
+
+ if (intr & BM_INTR_BEIS)
+ flg = TTY_BREAK;
+ else if (intr & BM_INTR_PEIS)
+ flg = TTY_PARITY;
+ else if (intr & BM_INTR_FEIS)
+ flg = TTY_FRAME;
+
+ }
+
+ if (uart_handle_sysrq_char(uport, ch))
+ continue;
+
+ uart_insert_char(uport, intr, BM_INTR_OEIS, ch, flg);
+ status = ioread32(uport->membase + HW_STAT);
+ }
+
+ tty_flip_buffer_push(&uport->state->port);
+}
+
+static void asm9260_tx_chars(struct uart_port *uport)
+{
+ struct circ_buf *xmit = &uport->state->xmit;
+
+ if (uport->x_char && !(ioread32(uport->membase + HW_STAT)
+ & BM_STAT_TXFULL)) {
+ iowrite32(uport->x_char, uport->membase + HW_DATA);
+ uport->icount.tx++;
+ uport->x_char = 0;
+ }
+ if (uart_circ_empty(xmit) || uart_tx_stopped(uport))
+ return;
+
+ while (!uart_circ_empty(xmit)) {
+ if (ioread32(uport->membase + HW_STAT)
+ & BM_STAT_TXFULL) {
+ break;;
+ }
+ iowrite32(xmit->buf[xmit->tail],
+ uport->membase + HW_DATA);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ uport->icount.tx++;
+ }
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(uport);
+}
+
+static void
+asm9260_handle_receive(struct uart_port *uport, unsigned int pending)
+{
+ /* Interrupt receive */
+ if ((pending & BM_INTR_RXIS) || (pending & BM_INTR_RTIS))
+ asm9260_rx_chars(uport, pending);
+ else if (pending & BM_INTR_BEIS) {
+ /*
+ * End of break detected. If it came along with a
+ * character, asm9260_rx_chars will handle it.
+ */
+ iowrite32(0, uport->membase + HW_STAT);
+ }
+}
+
+static void
+asm9260_handle_transmit(struct uart_port *uport, unsigned int pending)
+{
+ if (pending & BM_INTR_TXIS)
+ asm9260_tx_chars(uport);
+}
+
+/*
+ * Interrupt handler
+ */
+static irqreturn_t asm9260_interrupt(int irq, void *dev_id)
+{
+ struct uart_port *uport = dev_id;
+ unsigned int status;
+
+ status = ioread32(uport->membase + HW_INTR);
+ status &= BM_INTR_DEF_IS_MASK;
+
+ asm9260_handle_receive(uport, status);
+ asm9260_handle_transmit(uport, status);
+
+ iowrite32(status,
+ uport->membase + HW_INTR + CLR_REG);
+
+ asm9260_intr_unmask(uport);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t asm9260_fast_int(int irq, void *dev_id)
+{
+ struct uart_port *uport = dev_id;
+ unsigned int status;
+
+ status = ioread32(uport->membase + HW_INTR);
+ if (!(status & BM_INTR_DEF_IS_MASK))
+ return IRQ_NONE;
+
+ asm9260_intr_mask(uport);
+ return IRQ_WAKE_THREAD;
+}
+
+/*
+ * Perform initialization and enable port for reception
+ */
+static int asm9260_startup(struct uart_port *uport)
+{
+ int retval;
+
+ /*
+ * Ensure that no interrupts are enabled otherwise when
+ * request_irq() is called we could get stuck trying to
+ * handle an unexpected interrupt
+ */
+ iowrite32(0, uport->membase + HW_INTR);
+
+ retval = devm_request_threaded_irq(uport->dev, uport->irq,
+ asm9260_fast_int, asm9260_interrupt, IRQF_SHARED,
+ dev_name(uport->dev), uport);
+ if (retval) {
+ dev_err(uport->dev, "Can't get irq\n");
+ return retval;
+ }
+
+ /* enable rx timeout */
+ iowrite32(BM_CTRL0_RXTO_MASK | BM_CTRL0_RXTO_SOURCE_STATUS,
+ uport->membase + HW_CTRL0 + CLR_REG);
+ iowrite32(BM_CTRL0_DEFAULT_RXTIMEOUT | BM_CTRL0_RXTO_ENABLE,
+ uport->membase + HW_CTRL0 + SET_REG);
+
+
+ /*
+ * Finally, enable the serial port
+ * enable tx & rx
+ */
+ iowrite32(BM_CTRL2_RXIFLSEL | BM_CTRL2_TXIFLSEL,
+ uport->membase + HW_CTRL2 + CLR_REG);
+ iowrite32(BM_CTRL2_PORT_ENABLE | BM_CTRL2_TXE | BM_CTRL2_RXE |
+ BM_CTRL2_DEFAULT_TXIFLSEL |
+ BM_CTRL2_DEFAULT_RXIFLSEL,
+ uport->membase + HW_CTRL2);
+
+ asm9260_intr_unmask(uport);
+ return 0;
+}
+
+/*
+ * Disable the port
+ */
+static void asm9260_shutdown(struct uart_port *uport)
+{
+ int timeout = 10000;
+
+ /*wait for controller finish tx*/
+ while (!(ioread32(uport->membase + HW_STAT)
+ & BM_STAT_TXEMPTY)) {
+ if (--timeout < 0)
+ break;
+ }
+
+ /*
+ * Ensure everything is stopped.
+ */
+ asm9260_stop_tx(uport);
+ asm9260_stop_rx(uport);
+}
+
+/*
+ * Flush any TX data submitted for DMA. Called when the TX circular
+ * buffer is reset.
+ */
+static void asm9260_flush_buffer(struct uart_port *uport)
+{
+}
+
+/*
+ * Power / Clock management.
+ */
+static void asm9260_serial_pm(struct uart_port *uport, unsigned int state,
+ unsigned int oldstate)
+{
+}
+
+static void asm9260_set_rs485(struct uart_port *uport)
+{
+ struct asm9260_uart_port *port = to_asm9260_uart_port(uport);
+ unsigned int rs485_ctrl;
+ /* set RS485 */
+ rs485_ctrl = ioread32(uport->membase + HW_RS485CTRL);
+
+ /* Resetting serial mode to RS232 (0x0) */
+ rs485_ctrl &= ~BM_RS485CTRL_RS485EN;
+
+ if (port->rs485.flags & SER_RS485_ENABLED) {
+ dev_dbg(uport->dev, "Setting UART to RS485\n");
+ if ((port->rs485.delay_rts_after_send) > 0) {
+ /* delay is (rs485conf->delay_rts_after_send * Bit Period * 1/16) */
+ iowrite32(port->rs485.delay_rts_after_send,
+ uport->membase + HW_RS485DLY);
+ }
+
+ if ((port->rs485.flags & SER_RS485_RTS_ON_SEND) &&
+ !(port->rs485.flags & SER_RS485_RTS_AFTER_SEND)) {
+ /*
+ * Set logical level for RTS pin equal to 1 when sending,
+ * and set logical level for RTS pin equal to 0 after sending
+ */
+ rs485_ctrl |= BM_RS485CTRL_ONIV;
+ } else if (!(port->rs485.flags & SER_RS485_RTS_ON_SEND) &&
+ (port->rs485.flags & SER_RS485_RTS_AFTER_SEND)) {
+ /*
+ * Set logical level for RTS pin equal to 0 when sending,
+ * and set logical level for RTS pin equal to 1 after sending
+ */
+ rs485_ctrl &= ~BM_RS485CTRL_ONIV;
+ } else
+ dev_info(uport->dev,
+ "Please view RS485CTRL register in datasheet for more details.\n");
+
+ /* Enable RS485 and RTS is used to control direction automatically, */
+ rs485_ctrl |= BM_RS485CTRL_RS485EN | BM_RS485CTRL_DIR_CTRL;
+ rs485_ctrl &= ~BM_RS485CTRL_PINSEL;
+
+ if (port->rs485.flags & SER_RS485_RX_DURING_TX)
+ dev_dbg(uport->dev, "hardware should support SER_RS485_RX_DURING_TX.\n");
+ } else
+ dev_dbg(uport->dev, "Setting UART to RS232\n");
+
+ iowrite32(rs485_ctrl, uport->membase + HW_RS485CTRL);
+}
+/*
+ * Change the port parameters
+ */
+static void asm9260_set_termios(struct uart_port *uport, struct ktermios *termios,
+ struct ktermios *old)
+{
+ unsigned int mode, baud;
+ unsigned int bauddivint, bauddivfrac;
+
+
+ asm9260_intr_mask(uport);
+
+ /*
+ * We don't support modem control lines.
+ */
+ termios->c_cflag &= ~(HUPCL | CMSPAR);
+ termios->c_cflag |= CLOCAL;
+
+ /* Get current mode register */
+ mode = ioread32(uport->membase + HW_LINECTRL);
+ mode &= ~(BM_LCTRL_PEN | BM_LCTRL_EPS
+ | BM_LCTRL_STP2 | BM_LCTRL_FEN
+ | BM_LCTRL_WLEN | BM_LCTRL_SPS
+ | BM_LCTRL_BAUD_DIVFRA | BM_LCTRL_BAUD_DIVINT);
+
+ baud = uart_get_baud_rate(uport, termios, old,
+ uport->uartclk * 4 / UART_BAUD_DIV_MAX, uport->uartclk / 16);
+ bauddivint =
+ (((uport->uartclk << 2) / baud) & UART_BAUD_DIVINT_MASK) << 10;
+ bauddivfrac =
+ (((uport->uartclk << 2) / baud) & UART_BAUD_DIVFRAC_MASK) << 8;
+ /* byte size */
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ mode |= BM_LCTRL_CHRL_5;
+ break;
+ case CS6:
+ mode |= BM_LCTRL_CHRL_6;
+ break;
+ case CS7:
+ mode |= BM_LCTRL_CHRL_7;
+ break;
+ default:
+ mode |= BM_LCTRL_CHRL_8;
+ break;
+ }
+
+ /* enable fifo */
+ mode |= BM_LCTRL_FEN;
+
+ /* stop bits */
+ if (termios->c_cflag & CSTOPB)
+ mode |= BM_LCTRL_NBSTOP_2;
+ else
+ mode |= BM_LCTRL_NBSTOP_1;
+
+ /* parity */
+ if (termios->c_cflag & PARENB) {
+ /* Mark or Space parity */
+ if (termios->c_cflag & CMSPAR) {
+ if (termios->c_cflag & PARODD)
+ mode |= BM_LCTRL_PAR_MARK;
+ else
+ mode |= BM_LCTRL_PAR_SPACE;
+ } else if (termios->c_cflag & PARODD)
+ mode |= BM_LCTRL_PAR_ODD;
+ else
+ mode |= BM_LCTRL_PAR_EVEN;
+ } else
+ mode |= BM_LCTRL_PAR_NONE;
+
+ spin_lock(&uport->lock);
+
+ uport->read_status_mask = BM_INTR_OEIS;
+ if (termios->c_iflag & INPCK)
+ uport->read_status_mask |= (BM_INTR_FEIS | BM_INTR_PEIS);
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
+ uport->read_status_mask |= BM_INTR_BEIS;
+
+ /*
+ * Characters to ignore
+ */
+ uport->ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ uport->ignore_status_mask |=
+ (BM_INTR_FEIS | BM_INTR_PEIS);
+ if (termios->c_iflag & IGNBRK) {
+ uport->ignore_status_mask |= BM_INTR_BEIS;
+ /*
+ * If we're ignoring parity and break indicators,
+ * ignore overruns too (for real raw support).
+ */
+ if (termios->c_iflag & IGNPAR)
+ uport->ignore_status_mask |= BM_INTR_OEIS;
+ }
+
+ /* update the per-port timeout */
+ uart_update_timeout(uport, termios->c_cflag, baud);
+
+ /* drain transmitter */
+ while (!(ioread32(uport->membase + HW_STAT)
+ & BM_STAT_TXEMPTY))
+ cpu_relax();
+
+ while (!(ioread32(uport->membase + HW_STAT)
+ & BM_STAT_RXEMPTY))
+ ioread32(uport->membase + HW_DATA);
+
+ asm9260_set_rs485(uport);
+
+ /* set hardware flow control */
+ if (termios->c_cflag & CRTSCTS)
+ iowrite32(BM_CTRL2_CTSE | BM_CTRL2_RTSE,
+ uport->membase + HW_CTRL2 + SET_REG);
+ else
+ iowrite32(BM_CTRL2_CTSE | BM_CTRL2_RTSE,
+ uport->membase + HW_CTRL2 + CLR_REG);
+
+ /* set the parity, stop bits, data size and baud rate*/
+ iowrite32(mode | bauddivint | bauddivfrac,
+ uport->membase + HW_LINECTRL);
+
+ /* CTS flow-control and modem-status interrupts */
+ if (UART_ENABLE_MS(uport, termios->c_cflag))
+ uport->ops->enable_ms(uport);
+
+ spin_unlock(&uport->lock);
+
+ dev_dbg(uport->dev,
+ "mode:0x%x, baud:%d, bauddivint:0x%x, bauddivfrac:0x%x, ctrl2:0x%x\n",
+ mode, baud, bauddivint, bauddivfrac,
+ ioread32(uport->membase + HW_CTRL2));
+
+ asm9260_intr_unmask(uport);
+}
+
+/*
+ * Return string describing the specified port
+ */
+static const char *asm9260_type(struct uart_port *uport)
+{
+ return (uport->type == PORT_ASM9260) ? DRIVER_NAME : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'.
+ */
+static void asm9260_release_port(struct uart_port *uport)
+{
+}
+
+/*
+ * Request the memory region(s) being used by 'port'.
+ */
+static int asm9260_request_port(struct uart_port *uport)
+{
+ return 0;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void asm9260_config_port(struct uart_port *uport, int flags)
+{
+ if (flags & UART_CONFIG_TYPE) {
+ uport->type = PORT_ASM9260;
+ asm9260_request_port(uport);
+ }
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int asm9260_verify_port(struct uart_port *uport,
+ struct serial_struct *ser)
+{
+ int ret = 0;
+
+ if (ser->type != PORT_UNKNOWN && ser->type != PORT_ASM9260)
+ ret = -EINVAL;
+ if (uport->irq != ser->irq)
+ ret = -EINVAL;
+ if (ser->io_type != SERIAL_IO_MEM)
+ ret = -EINVAL;
+ if (uport->uartclk / 16 != ser->baud_base)
+ ret = -EINVAL;
+ if ((void *)uport->mapbase != ser->iomem_base)
+ ret = -EINVAL;
+ if (uport->iobase != ser->port)
+ ret = -EINVAL;
+ if (ser->hub6 != 0)
+ ret = -EINVAL;
+ return ret;
+}
+
+/* Enable or disable the rs485 support */
+void asm9260_config_rs485(struct uart_port *uport,
+ struct serial_rs485 *rs485conf)
+{
+ struct asm9260_uart_port *port = to_asm9260_uart_port(uport);
+
+ asm9260_intr_mask(uport);
+ spin_lock(&uport->lock);
+
+ /* Disable interrupts */
+
+ port->rs485 = *rs485conf;
+
+ asm9260_set_rs485(uport);
+
+ /* Enable tx interrupts */
+ spin_unlock(&uport->lock);
+ asm9260_intr_unmask(uport);
+
+}
+
+static int asm9260_ioctl(struct uart_port *uport,
+ unsigned int cmd, unsigned long arg)
+{
+ struct serial_rs485 rs485conf;
+
+ switch (cmd) {
+ case TIOCSRS485:
+ if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
+ sizeof(rs485conf)))
+ return -EFAULT;
+
+ asm9260_config_rs485(uport, &rs485conf);
+ break;
+
+ case TIOCGRS485:
+ if (copy_to_user((struct serial_rs485 *) arg,
+ &(to_asm9260_uart_port(uport)->rs485),
+ sizeof(rs485conf)))
+ return -EFAULT;
+ break;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static struct uart_ops asm9260_pops = {
+ .tx_empty = asm9260_tx_empty,
+ .set_mctrl = asm9260_set_mctrl,
+ .get_mctrl = asm9260_get_mctrl,
+ .stop_tx = asm9260_stop_tx,
+ .start_tx = asm9260_start_tx,
+ .stop_rx = asm9260_stop_rx,
+ .enable_ms = asm9260_enable_ms,
+ .break_ctl = asm9260_break_ctl,
+ .startup = asm9260_startup,
+ .shutdown = asm9260_shutdown,
+ .flush_buffer = asm9260_flush_buffer,
+ .set_termios = asm9260_set_termios,
+ .type = asm9260_type,
+ .release_port = asm9260_release_port,
+ .request_port = asm9260_request_port,
+ .config_port = asm9260_config_port,
+ .verify_port = asm9260_verify_port,
+ .pm = asm9260_serial_pm,
+ .ioctl = asm9260_ioctl,
+};
+
+#ifdef CONFIG_SERIAL_ASM9260_CONSOLE
+
+static struct asm9260_uart_port *get_asm9260_uart_port(int line);
+static struct console asm9260_console;
+
+static void asm9260_console_putchar(struct uart_port *uport, int ch)
+{
+ while (ioread32(uport->membase + HW_STAT)
+ & BM_STAT_TXFULL)
+ cpu_relax();
+ iowrite32(ch, uport->membase + HW_DATA);
+}
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void asm9260_console_write(struct console *co, const char *s,
+ u_int count)
+{
+ struct uart_port *uport;
+ struct asm9260_uart_port *port;
+ unsigned int status;
+ int locked = 1;
+
+ port = get_asm9260_uart_port(co->index);
+ uport = &port->uart;
+
+ asm9260_intr_mask(uport);
+
+ if (oops_in_progress)
+ locked = spin_trylock(&uport->lock);
+ else
+ spin_lock(&uport->lock);
+
+
+ uart_console_write(uport, s, count, asm9260_console_putchar);
+
+ /*
+ * Finally, wait for transmitter to become empty
+ * and restore IMR
+ */
+ do {
+ status = ioread32(uport->membase + HW_STAT);
+ } while (!(status & BM_STAT_TXEMPTY));
+
+ if (locked)
+ spin_unlock(&uport->lock);
+
+ asm9260_intr_unmask(uport);
+}
+
+/*
+ * If the port was already initialised (eg, by a boot loader),
+ * try to determine the current setup.
+ */
+static void __init asm9260_console_get_options(struct uart_port *port,
+ int *baud, int *parity, int *bits)
+{
+ unsigned int mr, quot, linectrl, bauddivint, bauddivfrc;
+
+ /*
+ * If the baud rate generator isn't running, the port wasn't
+ * initialized by the boot loader.
+ */
+ linectrl = ioread32(port->membase + HW_LINECTRL);
+ bauddivint = (linectrl & BM_LCTRL_BAUD_DIVINT) >> 16;
+ bauddivfrc = (linectrl & BM_LCTRL_BAUD_DIVFRA) >> 8;
+ quot = (bauddivint << 6) | bauddivfrc;
+
+ if (!quot)
+ return;
+
+ mr = linectrl & BM_LCTRL_WLEN;
+ if (mr == BM_LCTRL_CHRL_8)
+ *bits = 8;
+ else
+ *bits = 7;
+
+ mr = linectrl &
+ (BM_LCTRL_PEN | BM_LCTRL_EPS | BM_LCTRL_SPS);
+ if (mr == BM_LCTRL_PAR_EVEN)
+ *parity = 'e';
+ else if (mr == BM_LCTRL_PAR_ODD)
+ *parity = 'o';
+
+ /*
+ * The serial core only rounds down when matching this to a
+ * supported baud rate. Make sure we don't end up slightly
+ * lower than one of those, as it would make us fall through
+ * to a much lower baud rate than we really want.
+ */
+ *baud = (port->uartclk * 4) / quot;
+}
+
+static int __init asm9260_console_setup(struct console *co, char *options)
+{
+ struct uart_port *uport;
+ struct asm9260_uart_port *port;
+ int baud = 115200;
+ int bits = 8;
+ int parity = 'n';
+ int flow = 'n';
+
+ asm9260_uart_of_enumerate();
+
+ port = get_asm9260_uart_port(co->index);
+ uport = &port->uart;
+
+ asm9260_enable_clks(port);
+
+ iowrite32(BM_CTRL2_TXE | BM_CTRL2_RXE | BM_CTRL2_PORT_ENABLE,
+ uport->membase + HW_CTRL2 + SET_REG);
+
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+ else
+ asm9260_console_get_options(uport, &baud, &parity, &bits);
+
+ return uart_set_options(uport, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver asm9260_uart;
+
+static struct console asm9260_console = {
+ .name = ASM9260_DEVICENAME,
+ .write = asm9260_console_write,
+ .device = uart_console_device,
+ .setup = asm9260_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &asm9260_uart,
+};
+
+#define ASM9260_CONSOLE_DEVICE (&asm9260_console)
+
+/*
+ * Early console initialization (before VM subsystem initialized).
+ */
+static int __init asm9260_console_init(void)
+{
+ register_console(&asm9260_console);
+ return 0;
+}
+
+console_initcall(asm9260_console_init);
+#else
+#define ASM9260_CONSOLE_DEVICE NULL
+#endif
+
+static struct uart_driver asm9260_uart = {
+ .owner = THIS_MODULE,
+ .driver_name = DRIVER_NAME,
+ .dev_name = ASM9260_DEVICENAME,
+ .nr = ASM9260_MAX_UART,
+ .cons = ASM9260_CONSOLE_DEVICE,
+};
+
+/* Match table for of_platform binding */
+static struct of_device_id asm9260_of_match[] = {
+ { .compatible = "alpscale,asm9260-uart", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, asm9260_of_match);
+
+static void asm9260_enable_clks(struct asm9260_uart_port *port)
+{
+ struct uart_port *uport = &port->uart;
+ int err;
+
+ if (port->clk_on)
+ return;
+
+ err = clk_set_rate(port->clk, ASM9260_BUS_RATE);
+ if (err)
+ dev_err(uport->dev, "Failed to set rate!\n");
+
+ err = clk_prepare_enable(port->clk);
+ if (err)
+ dev_err(uport->dev, "Failed to enable clk!\n");
+
+ err = clk_prepare_enable(port->clk_ahb);
+ if (err)
+ dev_err(uport->dev, "Failed to enable ahb_clk!\n");
+
+ uport->uartclk = clk_get_rate(port->clk);
+ port->clk_on = 1;
+}
+
+
+/* get devicetree clocks, if some thing wrong, warn about it */
+static int asm9260_get_of_clks(struct asm9260_uart_port *port,
+ struct device_node *np)
+{
+ int clk_idx = 0;
+
+ port->clk = of_clk_get(np, clk_idx);
+ if (IS_ERR(port->clk))
+ goto out_err;
+
+ /* configure AHB clock */
+ clk_idx = 1;
+ port->clk_ahb = of_clk_get(np, clk_idx);
+ if (IS_ERR(port->clk_ahb))
+ goto out_err;
+
+ return 0;
+out_err:
+ pr_err("%s: Failed to get clk (%i)\n", __func__, clk_idx);
+ return 1;
+}
+
+static int asm9260_get_count_of_nodes(const struct of_device_id *matches)
+{
+ int count = 0;
+ struct device_node *np;
+
+ for_each_matching_node(np, matches)
+ count++;
+
+ return count;
+}
+
+static struct asm9260_uart_port *get_asm9260_uart_port(int line)
+{
+ if (line >= asm9260_ports_num) {
+ pr_err("%s: Line number overflow. Check DeviceTree!!",
+ __func__);
+ return NULL;
+ }
+
+ return &asm9260_ports[line];
+}
+
+static void asm9260_uart_of_enumerate(void)
+{
+ static int enum_done;
+ struct device_node *np;
+
+ if (enum_done)
+ return;
+
+ asm9260_ports_num = asm9260_get_count_of_nodes(asm9260_of_match);
+ asm9260_ports = kcalloc(asm9260_ports_num,
+ sizeof(struct asm9260_uart_port), GFP_KERNEL);
+
+ for_each_matching_node(np, asm9260_of_match) {
+ struct uart_port *uport;
+ struct asm9260_uart_port *port;
+ int line;
+
+ line = of_alias_get_id(np, "serial");
+ if (line < 0) {
+ pr_err("Error! Devicetree has no \"serial\" aliases\n");
+ continue;
+ }
+
+ port = get_asm9260_uart_port(line);
+ if (!port)
+ continue;
+
+ uport = &port->uart;
+ if(asm9260_get_of_clks(port, np))
+ return;
+
+ uport->iotype = UPIO_MEM;
+ uport->flags = UPF_BOOT_AUTOCONF;
+ uport->ops = &asm9260_pops;
+ uport->fifosize = ASM9260_UART_FIFOSIZE;
+ uport->line = line;
+
+ /* Since of_map don't do actual request of memory region,
+ * it is save to use it for all, enabled and disabled uarts. */
+ uport->membase = of_iomap(np, 0);
+ if (!uport->membase) {
+ pr_err("Unable to map registers\n");
+ continue;
+ }
+ port->init_ok = 1;
+ }
+
+ enum_done = 1;
+}
+
+/*
+ * Configure the port from the platform device resource info.
+ */
+static void asm9260_init_port(struct asm9260_uart_port *asm9260_port,
+ struct platform_device *pdev)
+{
+ struct uart_port *uport = &asm9260_port->uart;
+ struct device_node *np = pdev->dev.of_node;
+ struct resource res;
+
+ uport->dev = &pdev->dev;
+
+ uport->irq = irq_of_parse_and_map(np, 0);
+
+ of_address_to_resource(np, 0, &res);
+ if (!devm_request_mem_region(uport->dev, res.start,
+ resource_size(&res), dev_name(uport->dev)))
+ dev_err(uport->dev, "unable to request mem region\n");
+
+ uport->mapbase = res.start;
+
+ asm9260_enable_clks(asm9260_port);
+}
+
+static int asm9260_serial_probe(struct platform_device *pdev)
+{
+ struct asm9260_uart_port *port;
+ struct device_node *np = pdev->dev.of_node;
+ int ret, line;
+
+ asm9260_uart_of_enumerate();
+
+ if (!np) {
+ dev_err(&pdev->dev, "Error! We support only DeviceTree!\n");
+ return -EPERM;
+ }
+
+ line = of_alias_get_id(np, "serial");
+ if (line < 0) {
+ dev_err(&pdev->dev,
+ "Error! Devicetree has no \"serial\" aliases\n");
+ return -EPERM;
+ }
+
+ port = get_asm9260_uart_port(line);
+
+ if (!port->init_ok) {
+ dev_err(&pdev->dev, "Bad init!\n");
+ }
+
+ asm9260_init_port(port, pdev);
+
+ ret = uart_add_one_port(&asm9260_uart, &port->uart);
+ if (ret) {
+ dev_err(&pdev->dev, "Filed to add uart port\n");
+ goto err_add_port;
+ }
+
+ platform_set_drvdata(pdev, port);
+
+ return 0;
+
+err_add_port:
+ if (!uart_console(&port->uart)) {
+ clk_put(port->clk);
+ port->clk = NULL;
+ }
+ dev_err(&pdev->dev, "Filed to probe device\n");
+ return ret;
+}
+
+static int asm9260_serial_remove(struct platform_device *pdev)
+{
+ struct uart_port *port = platform_get_drvdata(pdev);
+ struct asm9260_uart_port *asm9260_port = to_asm9260_uart_port(port);
+ int ret = 0;
+
+ uart_remove_one_port(&asm9260_uart, port);
+ uart_unregister_driver(&asm9260_uart);
+
+ /* TODO: how should we handle clks here */
+ clk_put(asm9260_port->clk);
+
+ return ret;
+}
+
+static struct platform_driver asm9260_serial_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(asm9260_of_match),
+ },
+ .probe = asm9260_serial_probe,
+ .remove = asm9260_serial_remove,
+};
+
+static int __init asm9260_serial_init(void)
+{
+ int ret;
+ ret = uart_register_driver(&asm9260_uart);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&asm9260_serial_driver);
+ if (ret)
+ uart_unregister_driver(&asm9260_uart);
+
+ return ret;
+}
+
+static void __exit asm9260_serial_exit(void)
+{
+ platform_driver_unregister(&asm9260_serial_driver);
+ uart_unregister_driver(&asm9260_uart);
+}
+
+module_init(asm9260_serial_init);
+module_exit(asm9260_serial_exit);
+
+MODULE_DESCRIPTION("ASM9260 serial port driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index 5820269..ed68009 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -244,4 +244,6 @@
/* SC16IS74xx */
#define PORT_SC16IS7XX 108
+/* Alpscale ASM9260 */
+#define PORT_ASM9260 109
#endif /* _UAPILINUX_SERIAL_CORE_H */
--
1.9.1
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