009-add-NS16550
[Patch 09/17] U-Boot-V2:Serial: Add support for NS16550 Driver. This introduces support for NS16550 and related OMAP support. This driver is a port from Uboot v1 driver from OMAP's Uboot tree. OMAP U-Boot V1 source is available here: http://linux.omap.com/pub/bootloader/3430sdp/u-boot-v1.tar.gz Signed-off-by: Nishanth Menon<x0nishan@ti.com>
This commit is contained in:
Nishanth Menon
Sascha Hauer
parent
296ea53c68
commit
cd008fb265
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@ -24,4 +24,17 @@ config DRIVER_SERIAL_BLACKFIN
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depends on BLACKFIN
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default y
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bool "Blackfin serial driver"
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config DRIVER_SERIAL_NS16550
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default n
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bool "NS16550 serial driver"
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help
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Enable this to get support for NS16550 based serial devices
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config DRIVER_SERIAL_NS16550_OMAP_EXTENSIONS
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bool "OMAP Extensions for NS16550"
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depends on DRIVER_SERIAL_NS16550
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depends on ARCH_OMAP
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help
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Say Y here if you are using OMAP extensions to NS16550
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endmenu
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@ -10,3 +10,4 @@ obj-$(CONFIG_DRIVER_SERIAL_NETX) += serial_netx.o
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obj-$(CONFIG_DRIVER_SERIAL_LINUX_COMSOLE) += linux_console.o
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obj-$(CONFIG_DRIVER_SERIAL_MPC5XXX) += serial_mpc5xxx.o
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obj-$(CONFIG_DRIVER_SERIAL_BLACKFIN) += serial_blackfin.o
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obj-$(CONFIG_DRIVER_SERIAL_NS16550) += serial_ns16550.o
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@ -0,0 +1,251 @@
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/**
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* @file
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* @brief NS16550 Driver implementation
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*
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* FileName: drivers/serial/serial_ns16550.c
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*
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* NS16550 support
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* Modified from U-Boot V1 drivers/serial.c and drivers/ns16550.c
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* originally from linux source (arch/ppc/boot/ns16550.c)
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* modified to use CFG_ISA_MEM and new defines
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*/
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/*
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* (C) Copyright 2008
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* Texas Instruments, <www.ti.com>
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* Nishanth Menon <x0nishan@ti.com>
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*
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* (C) Copyright 2000
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* Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <driver.h>
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#include <init.h>
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#include <errno.h>
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#include <malloc.h>
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#include <asm/io.h>
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#include "serial_ns16550.h"
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#include <ns16550.h>
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/*********** Private Functions **********************************/
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/**
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* @brief ns16550_calc_divisor - compute the divisor for a baud rate
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*
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* @param[in] cdev - pointer to console device
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* @param[in] baudrate - baud rate
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*
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* @return divisor to be set
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*/
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static unsigned int ns16550_calc_divisor(struct console_device *cdev,
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unsigned int baudrate)
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{
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struct NS16550_plat *plat = (struct NS16550_plat *)
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cdev->dev->platform_data;
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unsigned int clk = plat->clock;
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#ifdef CONFIG_DRIVER_SERIAL_NS16550_OMAP_EXTENSIONS
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/* FIXME: Legacy Code copied from U-Boot V1 implementation
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*/
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#ifdef CONFIG_ARCH_OMAP1510
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unsigned long base = cdev->dev->map_base;
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/* If can't cleanly clock 115200 set div to 1 */
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if ((clk == 12000000) && (baudrate == 115200)) {
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/* enable 6.5 * divisor */
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plat->reg_write(OSC_12M_SEL, base, osc_12m_sel);
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return 1; /* return 1 for base divisor */
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}
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/* clear if previously set */
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plat->reg_write(0, base, osc_12m_sel);
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#elif defined(CONFIG_ARCH_OMAP1610)
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/* If can't cleanly clock 115200 set div to 1 */
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if ((clk == 48000000) && (baudrate == 115200))
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return 26; /* return 26 for base divisor */
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#endif
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#endif /* End of OMAP specific handling */
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return (clk / MODE_X_DIV / baudrate);
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}
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/**
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* @brief ns16550_serial_init_port - initialize the device
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*
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* @param cdev[in] - pointer to console device
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*/
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static void ns16550_serial_init_port(struct console_device *cdev)
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{
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struct NS16550_plat *plat = (struct NS16550_plat *)
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cdev->dev->platform_data;
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unsigned long base = cdev->dev->map_base;
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unsigned int baud_divisor;
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/* Setup the serial port with the defaults first */
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baud_divisor = ns16550_calc_divisor(cdev, CONFIG_BAUDRATE);
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/* initializing the device for the first time */
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plat->reg_write(0x00, base, ier);
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#ifdef CONFIG_DRIVER_SERIAL_NS16550_OMAP_EXTENSIONS
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plat->reg_write(0x07, base, mdr1); /* Disable */
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#endif
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plat->reg_write(LCR_BKSE | LCRVAL, base, lcr);
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plat->reg_write(baud_divisor & 0xFF, base, dll);
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plat->reg_write((baud_divisor >> 8) & 0xff, base, dlm);
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plat->reg_write(LCRVAL, base, lcr);
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plat->reg_write(MCRVAL, base, mcr);
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plat->reg_write(FCRVAL, base, fcr);
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#ifdef CONFIG_DRIVER_SERIAL_NS16550_OMAP_EXTENSIONS
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plat->reg_write(0x00, base, mdr1);
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#endif
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}
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/*********** Exposed Functions **********************************/
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/**
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* @brief ns16550_putc- put a character to the serial port
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*
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* @param cdev[in] - pointer to console device
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* @param c[in] - character to put
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*/
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static void ns16550_putc(struct console_device *cdev, char c)
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{
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struct NS16550_plat *plat = (struct NS16550_plat *)
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cdev->dev->platform_data;
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unsigned long base = cdev->dev->map_base;
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/* Loop Doing Nothing */
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while ((plat->reg_read(base, lsr) & LSR_THRE) == 0) ;
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plat->reg_write(c, base, thr);
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}
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/**
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* @brief ns16550_getc - retrieve a character from serial port
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*
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* @param cdev[in] - pointer to console device
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*
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* @return return the character read
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*/
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static int ns16550_getc(struct console_device *cdev)
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{
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struct NS16550_plat *plat = (struct NS16550_plat *)
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cdev->dev->platform_data;
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unsigned long base = cdev->dev->map_base;
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/* Loop Doing Nothing */
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while ((plat->reg_read(base, lsr) & LSR_DR) == 0) ;
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return plat->reg_read(base, rbr);
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}
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/**
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* @brief ns16550_tstc - test if character is available
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*
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* @param cdev[in] -pointer to console device
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*
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* @return - status based on data availability
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*/
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static int ns16550_tstc(struct console_device *cdev)
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{
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struct NS16550_plat *plat = (struct NS16550_plat *)
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cdev->dev->platform_data;
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unsigned long base = cdev->dev->map_base;
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return ((plat->reg_read(base, lsr) & LSR_DR) != 0);
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}
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/**
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* @brief ns16550_setbaudrate - set the baudrate for the uart port
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*
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* @param cdev[in] - console device
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* @param baud_rate[in] - baud rate to set
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*
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* @return 0-implied to support the baudrate
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*/
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static int ns16550_setbaudrate(struct console_device *cdev, int baud_rate)
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{
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struct NS16550_plat *plat = (struct NS16550_plat *)
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cdev->dev->platform_data;
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unsigned long base = cdev->dev->map_base;
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unsigned int baud_divisor = ns16550_calc_divisor(cdev, baud_rate);
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plat->reg_write(0x00, base, ier);
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plat->reg_write(LCR_BKSE, base, lcr);
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plat->reg_write(baud_divisor & 0xff, base, dll);
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plat->reg_write((baud_divisor >> 8) & 0xff, base, dlm);
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plat->reg_write(LCRVAL, base, lcr);
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plat->reg_write(MCRVAL, base, mcr);
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plat->reg_write(FCRVAL, base, fcr);
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return 0;
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}
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/**
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* @brief ns16550_probe - Probe entry point -called on the first
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* match for device
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*
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* @param dev[in] - matched device
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*
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* @return EINVAL if platform_data is not populated,
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* ENOMEM if calloc failed
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* else return result of console_register
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*/
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static int ns16550_probe(struct device_d *dev)
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{
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struct console_device *cdev;
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struct NS16550_plat *plat = (struct NS16550_plat *)dev->platform_data;
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/* we do expect platform specific data */
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if (plat == NULL)
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return -EINVAL;
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if ((plat->reg_read == NULL) || (plat->reg_write == NULL))
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return -EINVAL;
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cdev = calloc(1, sizeof(struct console_device));
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if (cdev == NULL)
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return -ENOMEM;
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dev->type_data = cdev;
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cdev->dev = dev;
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cdev->f_caps = plat->f_caps;
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cdev->tstc = ns16550_tstc;
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cdev->putc = ns16550_putc;
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cdev->getc = ns16550_getc;
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cdev->setbrg = ns16550_setbaudrate;
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ns16550_serial_init_port(cdev);
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return console_register(cdev);
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}
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/**
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* @brief Driver registration structure
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*/
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static struct driver_d ns16550_serial_driver = {
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.name = "serial_ns16550",
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.probe = ns16550_probe,
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.type = DEVICE_TYPE_CONSOLE,
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};
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/**
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* @brief ns16550_serial_init - driver initialization function
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*
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* @return result of register_driver
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*/
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static int ns16550_serial_init(void)
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{
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return register_driver(&ns16550_serial_driver);
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}
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console_initcall(ns16550_serial_init);
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@ -0,0 +1,98 @@
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/**
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* @file
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* @brief Serial NS16550 header
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*
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* FileName: drivers/serial/serial_ns16550.h
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*
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* @code struct NS16550 @endcode
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* Register definitions for NS16550 device
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*/
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/*
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* This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*
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* NS16550 Serial Port
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* originally from linux source (arch/ppc/boot/ns16550.h)
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* modified slightly to
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* have addresses as offsets from CFG_ISA_BASE
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* added a few more definitions
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* added prototypes for ns16550.c
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* reduced no of com ports to 2
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* modifications (c) Rob Taylor, Flying Pig Systems. 2000.
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*
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* added support for port on 64-bit bus
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* by Richard Danter (richard.danter@windriver.com), (C) 2005 Wind River Systems
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*/
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#ifndef __SERIAL_NS16550__H
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#define __SERIAL_NS16550__H
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/** Register offset definitions
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* platform implementation needs to translate this
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*/
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#define rbr 0
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#define ier 1
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#define fcr 2
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#define lcr 3
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#define mcr 4
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#define lsr 5
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#define msr 6
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#define scr 7
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#ifdef CONFIG_DRIVER_SERIAL_NS16550_OMAP_EXTENSIONS
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#define mdr1 8
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#define osc_12m_sel 9
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#endif
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#define thr rbr
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#define iir fcr
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#define dll rbr
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#define dlm ier
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#define FCR_FIFO_EN 0x01 /* Fifo enable */
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#define FCR_RXSR 0x02 /* Receiver soft reset */
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#define FCR_TXSR 0x04 /* Transmitter soft reset */
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#define MCR_DTR 0x01
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#define MCR_RTS 0x02
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#define MCR_DMA_EN 0x04
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#define MCR_TX_DFR 0x08
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#define LCR_WLS_MSK 0x03 /* character length select mask */
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#define LCR_WLS_5 0x00 /* 5 bit character length */
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#define LCR_WLS_6 0x01 /* 6 bit character length */
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#define LCR_WLS_7 0x02 /* 7 bit character length */
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#define LCR_WLS_8 0x03 /* 8 bit character length */
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/* Number of stop Bits, off = 1, on = 1.5 or 2) */
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#define LCR_STB 0x04
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#define LCR_PEN 0x08 /* Parity eneble */
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#define LCR_EPS 0x10 /* Even Parity Select */
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#define LCR_STKP 0x20 /* Stick Parity */
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#define LCR_SBRK 0x40 /* Set Break */
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#define LCR_BKSE 0x80 /* Bank select enable */
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#define LSR_DR 0x01 /* Data ready */
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#define LSR_OE 0x02 /* Overrun */
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#define LSR_PE 0x04 /* Parity error */
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#define LSR_FE 0x08 /* Framing error */
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#define LSR_BI 0x10 /* Break */
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#define LSR_THRE 0x20 /* Xmit holding register empty */
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#define LSR_TEMT 0x40 /* Xmitter empty */
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#define LSR_ERR 0x80 /* Error */
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#ifdef CONFIG_ARCH_OMAP1510
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#define OSC_12M_SEL 0x01 /* selects 6.5 * current clk div */
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#endif
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/* useful defaults for LCR */
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#define LCR_8N1 0x03
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#define LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */
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#define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */
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/* Clear & enable FIFOs */
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#define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR)
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#define MODE_X_DIV 16
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#endif /* __SERIAL_NS16550__H */
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@ -0,0 +1,55 @@
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/**
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* @file
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* @brief Serial NS16550 platform specific header
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*
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* FileName: include/ns16550.h
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* @code struct NS16550_plat @endcode
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* represents The specifics of the device present in the system.
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*/
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/*
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* (C) Copyright 2008
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* Texas Instruments, <www.ti.com>
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* Nishanth Menon <x0nishan@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
|
||||
* published by the Free Software Foundation; either version 2 of
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||||
* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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||||
*
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||||
* 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., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __NS16650_PLATFORM_H_
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#define __NS16650_PLATFORM_H_
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/**
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* @brief Platform dependent feature:
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* Pass pointer to this structure as part of device_d -> platform_data
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*/
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struct NS16550_plat {
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/** Clock speed */
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unsigned int clock;
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/** Console capabilities:
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* CONSOLE_STDIN | CONSOLE_STDOUT | CONSOLE_STDERR @see console.h
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*/
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unsigned char f_caps;
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/**
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* register read access capability
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*/
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unsigned int (*reg_read) (unsigned long base, unsigned char reg_offset);
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/**
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* register write access capability
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*/
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void (*reg_write) (unsigned int val, unsigned long base,
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unsigned char reg_offset);
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};
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#endif /* __NS16650_PLATFORM_H_ */
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