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serial: add UniPhier serial driver
The driver for on-chip UART used on Panasonic UniPhier platform. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
This commit is contained in:
Masahiro Yamada
parent
845034e6b2
commit
7f368553fc
@ -39,6 +39,7 @@ obj-$(CONFIG_FSL_LPUART) += serial_lpuart.o
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obj-$(CONFIG_MXS_AUART) += mxs_auart.o
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obj-$(CONFIG_ARC_SERIAL) += serial_arc.o
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obj-$(CONFIG_TEGRA_SERIAL) += serial_tegra.o
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obj-$(CONFIG_UNIPHIER_SERIAL) += serial_uniphier.o
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ifndef CONFIG_SPL_BUILD
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obj-$(CONFIG_USB_TTY) += usbtty.o
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@ -157,6 +157,7 @@ serial_initfunc(sh_serial_initialize);
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serial_initfunc(arm_dcc_initialize);
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serial_initfunc(mxs_auart_initialize);
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serial_initfunc(arc_serial_initialize);
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serial_initfunc(uniphier_serial_initialize);
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/**
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* serial_register() - Register serial driver with serial driver core
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@ -250,6 +251,7 @@ void serial_initialize(void)
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arm_dcc_initialize();
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mxs_auart_initialize();
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arc_serial_initialize();
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uniphier_serial_initialize();
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serial_assign(default_serial_console()->name);
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}
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204
drivers/serial/serial_uniphier.c
Normal file
204
drivers/serial/serial_uniphier.c
Normal file
@ -0,0 +1,204 @@
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/*
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* Copyright (C) 2012-2014 Panasonic Corporation
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* Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
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*
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* Based on serial_ns16550.c
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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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <serial.h>
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#define UART_REG(x) \
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u8 x; \
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u8 postpad_##x[3];
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/*
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* Note: Register map is slightly different from that of 16550.
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*/
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struct uniphier_serial {
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UART_REG(rbr); /* 0x00 */
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UART_REG(ier); /* 0x04 */
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UART_REG(iir); /* 0x08 */
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UART_REG(fcr); /* 0x0c */
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u8 mcr; /* 0x10 */
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u8 lcr;
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u16 __postpad;
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UART_REG(lsr); /* 0x14 */
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UART_REG(msr); /* 0x18 */
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u32 __none1;
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u32 __none2;
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u16 dlr;
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u16 __postpad2;
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};
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#define thr rbr
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/*
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* These are the definitions for the Line Control Register
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*/
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#define UART_LCR_WLS_8 0x03 /* 8 bit character length */
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/*
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* These are the definitions for the Line Status Register
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*/
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#define UART_LSR_DR 0x01 /* Data ready */
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#define UART_LSR_THRE 0x20 /* Xmit holding register empty */
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DECLARE_GLOBAL_DATA_PTR;
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static void uniphier_serial_init(struct uniphier_serial *port)
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{
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const unsigned int mode_x_div = 16;
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unsigned int divisor;
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writeb(UART_LCR_WLS_8, &port->lcr);
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divisor = DIV_ROUND_CLOSEST(CONFIG_SYS_UNIPHIER_UART_CLK,
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mode_x_div * gd->baudrate);
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writew(divisor, &port->dlr);
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}
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static void uniphier_serial_setbrg(struct uniphier_serial *port)
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{
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uniphier_serial_init(port);
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}
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static int uniphier_serial_tstc(struct uniphier_serial *port)
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{
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return (readb(&port->lsr) & UART_LSR_DR) != 0;
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}
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static int uniphier_serial_getc(struct uniphier_serial *port)
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{
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while (!uniphier_serial_tstc(port))
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;
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return readb(&port->rbr);
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}
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static void uniphier_serial_putc(struct uniphier_serial *port, const char c)
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{
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if (c == '\n')
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uniphier_serial_putc(port, '\r');
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while (!(readb(&port->lsr) & UART_LSR_THRE))
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;
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writeb(c, &port->thr);
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}
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static struct uniphier_serial *serial_ports[4] = {
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#ifdef CONFIG_SYS_UNIPHIER_SERIAL_BASE0
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(struct uniphier_serial *)CONFIG_SYS_UNIPHIER_SERIAL_BASE0,
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#else
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NULL,
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#endif
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#ifdef CONFIG_SYS_UNIPHIER_SERIAL_BASE1
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(struct uniphier_serial *)CONFIG_SYS_UNIPHIER_SERIAL_BASE1,
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#else
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NULL,
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#endif
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#ifdef CONFIG_SYS_UNIPHIER_SERIAL_BASE2
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(struct uniphier_serial *)CONFIG_SYS_UNIPHIER_SERIAL_BASE2,
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#else
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NULL,
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#endif
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#ifdef CONFIG_SYS_UNIPHIER_SERIAL_BASE3
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(struct uniphier_serial *)CONFIG_SYS_UNIPHIER_SERIAL_BASE3,
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#else
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NULL,
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#endif
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};
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/* Multi serial device functions */
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#define DECLARE_ESERIAL_FUNCTIONS(port) \
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static int eserial##port##_init(void) \
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{ \
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uniphier_serial_init(serial_ports[port]); \
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return 0 ; \
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} \
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static void eserial##port##_setbrg(void) \
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{ \
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uniphier_serial_setbrg(serial_ports[port]); \
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} \
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static int eserial##port##_getc(void) \
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{ \
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return uniphier_serial_getc(serial_ports[port]); \
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} \
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static int eserial##port##_tstc(void) \
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{ \
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return uniphier_serial_tstc(serial_ports[port]); \
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} \
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static void eserial##port##_putc(const char c) \
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{ \
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uniphier_serial_putc(serial_ports[port], c); \
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}
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/* Serial device descriptor */
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#define INIT_ESERIAL_STRUCTURE(port, __name) { \
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.name = __name, \
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.start = eserial##port##_init, \
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.stop = NULL, \
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.setbrg = eserial##port##_setbrg, \
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.getc = eserial##port##_getc, \
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.tstc = eserial##port##_tstc, \
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.putc = eserial##port##_putc, \
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.puts = default_serial_puts, \
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}
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#if defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE0)
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DECLARE_ESERIAL_FUNCTIONS(0);
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struct serial_device uniphier_serial0_device =
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INIT_ESERIAL_STRUCTURE(0, "ttyS0");
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#endif
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#if defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE1)
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DECLARE_ESERIAL_FUNCTIONS(1);
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struct serial_device uniphier_serial1_device =
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INIT_ESERIAL_STRUCTURE(1, "ttyS1");
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#endif
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#if defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE2)
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DECLARE_ESERIAL_FUNCTIONS(2);
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struct serial_device uniphier_serial2_device =
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INIT_ESERIAL_STRUCTURE(2, "ttyS2");
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#endif
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#if defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE3)
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DECLARE_ESERIAL_FUNCTIONS(3);
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struct serial_device uniphier_serial3_device =
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INIT_ESERIAL_STRUCTURE(3, "ttyS3");
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#endif
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__weak struct serial_device *default_serial_console(void)
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{
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#if defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE0)
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return &uniphier_serial0_device;
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#elif defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE1)
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return &uniphier_serial1_device;
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#elif defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE2)
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return &uniphier_serial2_device;
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#elif defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE3)
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return &uniphier_serial3_device;
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#else
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#error "No uniphier serial ports configured."
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#endif
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}
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void uniphier_serial_initialize(void)
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{
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#if defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE0)
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serial_register(&uniphier_serial0_device);
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#endif
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#if defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE1)
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serial_register(&uniphier_serial1_device);
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#endif
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#if defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE2)
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serial_register(&uniphier_serial2_device);
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#endif
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#if defined(CONFIG_SYS_UNIPHIER_SERIAL_BASE3)
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serial_register(&uniphier_serial3_device);
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#endif
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}
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