325 lines
7.4 KiB
C
325 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for the 98626/98644/internal serial interface on hp300/hp400
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* (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
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*
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* Ported from 2.2 and modified to use the normal 8250 driver
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* by Kars de Jong <jongk@linux-m68k.org>, May 2004.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/serial.h>
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#include <linux/serial_8250.h>
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#include <linux/delay.h>
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#include <linux/dio.h>
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#include <linux/console.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include "8250.h"
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#if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI) && !defined(CONFIG_COMPILE_TEST)
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#warning CONFIG_SERIAL_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
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#endif
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#ifdef CONFIG_HPAPCI
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struct hp300_port {
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struct hp300_port *next; /* next port */
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int line; /* line (tty) number */
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};
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static struct hp300_port *hp300_ports;
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#endif
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#ifdef CONFIG_HPDCA
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static int hpdca_init_one(struct dio_dev *d,
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const struct dio_device_id *ent);
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static void hpdca_remove_one(struct dio_dev *d);
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static struct dio_device_id hpdca_dio_tbl[] = {
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{ DIO_ID_DCA0 },
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{ DIO_ID_DCA0REM },
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{ DIO_ID_DCA1 },
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{ DIO_ID_DCA1REM },
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{ 0 }
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};
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static struct dio_driver hpdca_driver = {
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.name = "hpdca",
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.id_table = hpdca_dio_tbl,
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.probe = hpdca_init_one,
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.remove = hpdca_remove_one,
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};
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#endif
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static unsigned int num_ports;
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extern int hp300_uart_scode;
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/* Offset to UART registers from base of DCA */
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#define UART_OFFSET 17
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#define DCA_ID 0x01 /* ID (read), reset (write) */
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#define DCA_IC 0x03 /* Interrupt control */
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/* Interrupt control */
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#define DCA_IC_IE 0x80 /* Master interrupt enable */
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#define HPDCA_BAUD_BASE 153600
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/* Base address of the Frodo part */
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#define FRODO_BASE (0x41c000)
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/*
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* Where we find the 8250-like APCI ports, and how far apart they are.
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*/
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#define FRODO_APCIBASE 0x0
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#define FRODO_APCISPACE 0x20
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#define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
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#define HPAPCI_BAUD_BASE 500400
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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/*
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* Parse the bootinfo to find descriptions for headless console and
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* debug serial ports and register them with the 8250 driver.
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*/
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int __init hp300_setup_serial_console(void)
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{
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int scode;
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struct uart_port port;
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memset(&port, 0, sizeof(port));
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if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
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return 0;
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if (DIO_SCINHOLE(hp300_uart_scode))
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return 0;
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scode = hp300_uart_scode;
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/* Memory mapped I/O */
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port.iotype = UPIO_MEM;
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port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
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port.type = PORT_UNKNOWN;
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/* Check for APCI console */
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if (scode == 256) {
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#ifdef CONFIG_HPAPCI
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pr_info("Serial console is HP APCI 1\n");
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port.uartclk = HPAPCI_BAUD_BASE * 16;
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port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
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port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
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port.regshift = 2;
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add_preferred_console("ttyS", port.line, "9600n8");
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#else
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pr_warn("Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
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return 0;
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#endif
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} else {
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#ifdef CONFIG_HPDCA
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unsigned long pa = dio_scodetophysaddr(scode);
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if (!pa)
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return 0;
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pr_info("Serial console is HP DCA at select code %d\n", scode);
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port.uartclk = HPDCA_BAUD_BASE * 16;
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port.mapbase = (pa + UART_OFFSET);
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port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
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port.regshift = 1;
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port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
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/* Enable board-interrupts */
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out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
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if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80)
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add_preferred_console("ttyS", port.line, "9600n8");
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#else
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pr_warn("Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
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return 0;
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#endif
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}
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if (early_serial_setup(&port) < 0)
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pr_warn("%s: early_serial_setup() failed.\n", __func__);
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return 0;
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}
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#endif /* CONFIG_SERIAL_8250_CONSOLE */
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#ifdef CONFIG_HPDCA
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static int hpdca_init_one(struct dio_dev *d,
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const struct dio_device_id *ent)
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{
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struct uart_8250_port uart;
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int line;
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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if (hp300_uart_scode == d->scode) {
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/* Already got it. */
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return 0;
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}
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#endif
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memset(&uart, 0, sizeof(uart));
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/* Memory mapped I/O */
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uart.port.iotype = UPIO_MEM;
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uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
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uart.port.irq = d->ipl;
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uart.port.uartclk = HPDCA_BAUD_BASE * 16;
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uart.port.mapbase = (d->resource.start + UART_OFFSET);
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uart.port.membase = (char *)(uart.port.mapbase + DIO_VIRADDRBASE);
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uart.port.regshift = 1;
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uart.port.dev = &d->dev;
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line = serial8250_register_8250_port(&uart);
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if (line < 0) {
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dev_notice(&d->dev,
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"8250_hp300: register_serial() DCA scode %d irq %d failed\n",
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d->scode, uart.port.irq);
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return -ENOMEM;
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}
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/* Enable board-interrupts */
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out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
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dio_set_drvdata(d, (void *)line);
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/* Reset the DCA */
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out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
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udelay(100);
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num_ports++;
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return 0;
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}
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#endif
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static int __init hp300_8250_init(void)
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{
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static int called;
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#ifdef CONFIG_HPAPCI
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int line;
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unsigned long base;
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struct uart_8250_port uart;
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struct hp300_port *port;
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int i;
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#endif
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if (called)
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return -ENODEV;
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called = 1;
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if (!MACH_IS_HP300)
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return -ENODEV;
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#ifdef CONFIG_HPDCA
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dio_register_driver(&hpdca_driver);
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#endif
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#ifdef CONFIG_HPAPCI
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if (hp300_model < HP_400) {
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if (!num_ports)
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return -ENODEV;
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return 0;
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}
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/* These models have the Frodo chip.
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* Port 0 is reserved for the Apollo Domain keyboard.
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* Port 1 is either the console or the DCA.
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*/
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for (i = 1; i < 4; i++) {
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/* Port 1 is the console on a 425e, on other machines it's
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* mapped to DCA.
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*/
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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if (i == 1)
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continue;
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#endif
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/* Create new serial device */
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port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
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if (!port)
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return -ENOMEM;
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memset(&uart, 0, sizeof(uart));
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base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
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/* Memory mapped I/O */
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uart.port.iotype = UPIO_MEM;
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uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ
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| UPF_BOOT_AUTOCONF;
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/* XXX - no interrupt support yet */
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uart.port.irq = 0;
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uart.port.uartclk = HPAPCI_BAUD_BASE * 16;
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uart.port.mapbase = base;
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uart.port.membase = (char *)(base + DIO_VIRADDRBASE);
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uart.port.regshift = 2;
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line = serial8250_register_8250_port(&uart);
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if (line < 0) {
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dev_notice(uart.port.dev,
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"8250_hp300: register_serial() APCI %d irq %d failed\n",
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i, uart.port.irq);
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kfree(port);
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continue;
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}
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port->line = line;
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port->next = hp300_ports;
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hp300_ports = port;
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num_ports++;
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}
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#endif
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/* Any boards found? */
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if (!num_ports)
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return -ENODEV;
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return 0;
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}
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#ifdef CONFIG_HPDCA
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static void hpdca_remove_one(struct dio_dev *d)
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{
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int line;
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line = (int) dio_get_drvdata(d);
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if (d->resource.start) {
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/* Disable board-interrupts */
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out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
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}
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serial8250_unregister_port(line);
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}
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#endif
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static void __exit hp300_8250_exit(void)
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{
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#ifdef CONFIG_HPAPCI
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struct hp300_port *port, *to_free;
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for (port = hp300_ports; port; ) {
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serial8250_unregister_port(port->line);
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to_free = port;
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port = port->next;
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kfree(to_free);
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}
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hp300_ports = NULL;
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#endif
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#ifdef CONFIG_HPDCA
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dio_unregister_driver(&hpdca_driver);
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#endif
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}
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module_init(hp300_8250_init);
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module_exit(hp300_8250_exit);
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MODULE_DESCRIPTION("HP DCA/APCI serial driver");
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MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
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MODULE_LICENSE("GPL");
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