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