[RESEND PATCH v3] serial/arc-uart: Add new driver
From: Vineet Gupta Driver for non-standard on-chip UART, instantiated in the ARC (Synopsys) FPGA Boards such as ARCAngel4/ML50x Signed-off-by: Vineet Gupta --- drivers/tty/serial/Kconfig| 25 ++ drivers/tty/serial/Makefile |1 + drivers/tty/serial/arc_uart.c | 747 + include/linux/serial_core.h |3 + 4 files changed, 776 insertions(+), 0 deletions(-) create mode 100644 drivers/tty/serial/arc_uart.c diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 233fbaa..0a87741 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1423,4 +1423,29 @@ config SERIAL_EFM32_UART_CONSOLE depends on SERIAL_EFM32_UART=y select SERIAL_CORE_CONSOLE +config SERIAL_ARC + bool "ARC UART driver support" + select SERIAL_CORE + default y + help + Driver for on-chip UART for ARC(Synopsys) for the legacy + FPGA Boards (ML50x/ARCAngel4) + +config SERIAL_ARC_CONSOLE + bool + select SERIAL_CORE_CONSOLE + depends on SERIAL_ARC=y + default y + help + Enable system Console on ARC UART + +config SERIAL_ARC_NR_PORTS + int 'Number of ports' + range 1 3 + default 1 + depends on SERIAL_ARC + help + Set this to the number of serial ports you want the driver + to support. + endmenu diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index 4f694da..df1b998 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -82,3 +82,4 @@ obj-$(CONFIG_SERIAL_XILINX_PS_UART) += xilinx_uartps.o obj-$(CONFIG_SERIAL_SIRFSOC) += sirfsoc_uart.o obj-$(CONFIG_SERIAL_AR933X) += ar933x_uart.o obj-$(CONFIG_SERIAL_EFM32_UART) += efm32-uart.o +obj-$(CONFIG_SERIAL_ARC) += arc_uart.o diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c new file mode 100644 index 000..9215bf4 --- /dev/null +++ b/drivers/tty/serial/arc_uart.c @@ -0,0 +1,747 @@ +/* + * ARC On-Chip(fpga) UART Driver + * + * Copyright (C) 2010-2012 Synopsys, Inc. (www.synopsys.com) + * + * 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. + * + * vineetg: July 10th 2012 + * -Decoupled the driver from arch/arc + *+Using platform_get_resource() for irq/membase (thx to bfin_uart.c) + *+Using early_platform_xxx() for early console (thx to mach-shmobile/xxx) + * + * Vineetg: Aug 21st 2010 + * -Is uart_tx_stopped() not done in tty write path as it has already been + * taken care of, in serial core + * + * Vineetg: Aug 18th 2010 + * -New Serial Core based ARC UART driver + * -Derived largely from blackfin driver albiet with some major tweaks + * + * TODO: + * -check if sysreq works + */ + +#if defined(CONFIG_SERIAL_ARC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) +#define SUPPORT_SYSRQ +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * ARC UART Hardware Specs + / +#define ARC_UART_TX_FIFO_SIZE 1 + +/* + * UART Register set (this is not a Standards Compliant IP) + * Also each reg is Word aligned, but only 8 bits wide + */ +#define R_ID0 0 +#define R_ID1 1 +#define R_ID2 2 +#define R_ID3 3 +#define R_DATA 4 +#define R_STS 5 +#define R_BAUDL6 +#define R_BAUDH7 + +/* Bits for UART Status Reg (R/W) */ +#define RXIENB 0x04 /* Receive Interrupt Enable */ +#define TXIENB 0x40 /* Transmit Interrupt Enable */ + +#define RXEMPTY 0x20 /* Receive FIFO Empty: No char receivede */ +#define TXEMPTY 0x80 /* Transmit FIFO Empty, thus char can be written into */ + +#define RXFULL 0x08 /* Receive FIFO full */ +#define RXFULL1 0x10 /* Receive FIFO has space for 1 char (tot space=4) */ + +#define RXFERR 0x01 /* Frame Error: Stop Bit not detected */ +#define RXOERR 0x02 /* OverFlow Err: Char recv but RXFULL still set */ + +/* Uart bit fiddling helpers: lowest level */ +#define RBASE(uart, reg) ((unsigned int *)uart->port.membase + reg) +#define UART_REG_SET(u, r, v) writeb((v), RBASE(u, r)) +#define UART_REG_GET(u, r)readb(RBASE(u, r)) + +#define UART_REG_OR(u, r, v) UART_REG_SET(u, r, UART_REG_GET(u, r) | (v)) +#define UART_REG_CLR(u, r, v) UART_REG_SET(u, r, UART_REG_GET(u, r) & ~(v)) + +/* Uart bit fiddling helpers: API level */ +#define UART_SET_DATA(uart, val) UART_REG_SET(uart, R_DATA, val) +#define UART_GET_DATA(uart)UART_REG_GET(uart, R_DATA) + +#define UART_SET_BAUDH(uart, val) UART_REG_SET(uart, R_BAUDH, val) +#define UART_SET_BAUDL(uart, val) UART_REG_SET(uart, R_BAUDL, val) + +#define UART_CLR_STATUS(uart, val) UART_REG_CLR(uart, R_STS, val) +#define UART_GET_STATUS(uart) UART_REG_GET(uart, R_STS) + +#define UART_ALL_IRQ_DISABLE(uart) UART_REG_CLR(uart,
[RESEND PATCH v3] serial/arc-uart: Add new driver
From: Vineet Gupta Hi, Please find following ARC UART driver with all the review comments incorporated. It's rebased off of current tip (commit 12250d843e) Please consider merging. Thx, -Vineet v3: * Removed empty arc_serial_set_ldisc() * More set_termios fixes - CSIZE forced to CS8 (for 8N1) * global @running_on_iss replaced with platform data, saved in device specific port structure. v2: * ttyARC used as device name * Dynamic assignment of major/minor numbers. * Ref counting tty in rx routine to prevent it from disappearing in case of a hangup * set_termios fixes: - hardware flow control/parity are marked as unsupported - baud written back to termios * cosmetics such as commenting the need for @running_on_iss, empty lines etc Vineet Gupta (1): serial/arc-uart: Add new driver drivers/tty/serial/Kconfig| 25 ++ drivers/tty/serial/Makefile |1 + drivers/tty/serial/arc_uart.c | 747 + include/linux/serial_core.h |3 + 4 files changed, 776 insertions(+), 0 deletions(-) create mode 100644 drivers/tty/serial/arc_uart.c -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[RESEND PATCH v3] serial/arc-uart: Add new driver
From: Vineet Gupta vgu...@synopsys.com Hi, Please find following ARC UART driver with all the review comments incorporated. It's rebased off of current tip (commit 12250d843e) Please consider merging. Thx, -Vineet v3: * Removed empty arc_serial_set_ldisc() * More set_termios fixes - CSIZE forced to CS8 (for 8N1) * global @running_on_iss replaced with platform data, saved in device specific port structure. v2: * ttyARC used as device name * Dynamic assignment of major/minor numbers. * Ref counting tty in rx routine to prevent it from disappearing in case of a hangup * set_termios fixes: - hardware flow control/parity are marked as unsupported - baud written back to termios * cosmetics such as commenting the need for @running_on_iss, empty lines etc Vineet Gupta (1): serial/arc-uart: Add new driver drivers/tty/serial/Kconfig| 25 ++ drivers/tty/serial/Makefile |1 + drivers/tty/serial/arc_uart.c | 747 + include/linux/serial_core.h |3 + 4 files changed, 776 insertions(+), 0 deletions(-) create mode 100644 drivers/tty/serial/arc_uart.c -- 1.7.4.1 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[RESEND PATCH v3] serial/arc-uart: Add new driver
From: Vineet Gupta vgu...@synopsys.com Driver for non-standard on-chip UART, instantiated in the ARC (Synopsys) FPGA Boards such as ARCAngel4/ML50x Signed-off-by: Vineet Gupta vgu...@synopsys.com --- drivers/tty/serial/Kconfig| 25 ++ drivers/tty/serial/Makefile |1 + drivers/tty/serial/arc_uart.c | 747 + include/linux/serial_core.h |3 + 4 files changed, 776 insertions(+), 0 deletions(-) create mode 100644 drivers/tty/serial/arc_uart.c diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 233fbaa..0a87741 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1423,4 +1423,29 @@ config SERIAL_EFM32_UART_CONSOLE depends on SERIAL_EFM32_UART=y select SERIAL_CORE_CONSOLE +config SERIAL_ARC + bool ARC UART driver support + select SERIAL_CORE + default y + help + Driver for on-chip UART for ARC(Synopsys) for the legacy + FPGA Boards (ML50x/ARCAngel4) + +config SERIAL_ARC_CONSOLE + bool + select SERIAL_CORE_CONSOLE + depends on SERIAL_ARC=y + default y + help + Enable system Console on ARC UART + +config SERIAL_ARC_NR_PORTS + int 'Number of ports' + range 1 3 + default 1 + depends on SERIAL_ARC + help + Set this to the number of serial ports you want the driver + to support. + endmenu diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index 4f694da..df1b998 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -82,3 +82,4 @@ obj-$(CONFIG_SERIAL_XILINX_PS_UART) += xilinx_uartps.o obj-$(CONFIG_SERIAL_SIRFSOC) += sirfsoc_uart.o obj-$(CONFIG_SERIAL_AR933X) += ar933x_uart.o obj-$(CONFIG_SERIAL_EFM32_UART) += efm32-uart.o +obj-$(CONFIG_SERIAL_ARC) += arc_uart.o diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c new file mode 100644 index 000..9215bf4 --- /dev/null +++ b/drivers/tty/serial/arc_uart.c @@ -0,0 +1,747 @@ +/* + * ARC On-Chip(fpga) UART Driver + * + * Copyright (C) 2010-2012 Synopsys, Inc. (www.synopsys.com) + * + * 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. + * + * vineetg: July 10th 2012 + * -Decoupled the driver from arch/arc + *+Using platform_get_resource() for irq/membase (thx to bfin_uart.c) + *+Using early_platform_xxx() for early console (thx to mach-shmobile/xxx) + * + * Vineetg: Aug 21st 2010 + * -Is uart_tx_stopped() not done in tty write path as it has already been + * taken care of, in serial core + * + * Vineetg: Aug 18th 2010 + * -New Serial Core based ARC UART driver + * -Derived largely from blackfin driver albiet with some major tweaks + * + * TODO: + * -check if sysreq works + */ + +#if defined(CONFIG_SERIAL_ARC_CONSOLE) defined(CONFIG_MAGIC_SYSRQ) +#define SUPPORT_SYSRQ +#endif + +#include linux/module.h +#include linux/serial.h +#include linux/console.h +#include linux/sysrq.h +#include linux/platform_device.h +#include linux/tty.h +#include linux/tty_flip.h +#include linux/serial_core.h +#include linux/io.h + +/* + * ARC UART Hardware Specs + / +#define ARC_UART_TX_FIFO_SIZE 1 + +/* + * UART Register set (this is not a Standards Compliant IP) + * Also each reg is Word aligned, but only 8 bits wide + */ +#define R_ID0 0 +#define R_ID1 1 +#define R_ID2 2 +#define R_ID3 3 +#define R_DATA 4 +#define R_STS 5 +#define R_BAUDL6 +#define R_BAUDH7 + +/* Bits for UART Status Reg (R/W) */ +#define RXIENB 0x04 /* Receive Interrupt Enable */ +#define TXIENB 0x40 /* Transmit Interrupt Enable */ + +#define RXEMPTY 0x20 /* Receive FIFO Empty: No char receivede */ +#define TXEMPTY 0x80 /* Transmit FIFO Empty, thus char can be written into */ + +#define RXFULL 0x08 /* Receive FIFO full */ +#define RXFULL1 0x10 /* Receive FIFO has space for 1 char (tot space=4) */ + +#define RXFERR 0x01 /* Frame Error: Stop Bit not detected */ +#define RXOERR 0x02 /* OverFlow Err: Char recv but RXFULL still set */ + +/* Uart bit fiddling helpers: lowest level */ +#define RBASE(uart, reg) ((unsigned int *)uart-port.membase + reg) +#define UART_REG_SET(u, r, v) writeb((v), RBASE(u, r)) +#define UART_REG_GET(u, r)readb(RBASE(u, r)) + +#define UART_REG_OR(u, r, v) UART_REG_SET(u, r, UART_REG_GET(u, r) | (v)) +#define UART_REG_CLR(u, r, v) UART_REG_SET(u, r, UART_REG_GET(u, r) ~(v)) + +/* Uart bit fiddling helpers: API level */ +#define UART_SET_DATA(uart, val) UART_REG_SET(uart, R_DATA, val) +#define UART_GET_DATA(uart)UART_REG_GET(uart, R_DATA) + +#define UART_SET_BAUDH(uart, val) UART_REG_SET(uart, R_BAUDH, val) +#define UART_SET_BAUDL(uart, val) UART_REG_SET(uart, R_BAUDL, val) + +#define
