1 files changed, 324 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_hp300.c b/drivers/tty/serial/8250/8250_hp300.c
new file mode 100644
index 000000000..3012ea03d
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_hp300.c
@@ -0,0 +1,324 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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) && !defined(CONFIG_COMPILE_TEST)
+#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
+		pr_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
+		pr_warn("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;
+
+		pr_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
+		pr_warn("Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
+		return 0;
+#endif
+	}
+
+	if (early_serial_setup(&port) < 0)
+		pr_warn("%s: early_serial_setup() failed.\n", __func__);
+	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) {
+		dev_notice(&d->dev,
+			  "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) {
+			dev_notice(uart.port.dev,
+				   "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");