1 files changed, 327 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 000000000000..c13438c93012
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_hp300.c
@@ -0,0 +1,327 @@
+/*
+ * 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_core.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_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 __devinit hpdca_init_one(struct dio_dev *d,
+                                        const struct dio_device_id *ent);
+static void __devexit 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    = __devexit_p(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.
+ * This function should be called before serial_console_init() is called
+ * to make sure the serial console will be available for use. IA-64 kernel
+ * calls this function from setup_arch() after the EFI and ACPI tables have
+ * been parsed.
+ */
+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 __devinit hpdca_init_one(struct dio_dev *d,
+                                const struct dio_device_id *ent)
+{
+        struct uart_port port;
+        int line;
+
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+        if (hp300_uart_scode == d->scode) {
+                /* Already got it. */
+                return 0;
+        }
+#endif
+        memset(&port, 0, sizeof(struct uart_port));
+
+        /* Memory mapped I/O */
+        port.iotype = UPIO_MEM;
+        port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
+        port.irq = d->ipl;
+        port.uartclk = HPDCA_BAUD_BASE * 16;
+        port.mapbase = (d->resource.start + UART_OFFSET);
+        port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
+        port.regshift = 1;
+        port.dev = &d->dev;
+        line = serial8250_register_port(&port);
+
+        if (line < 0) {
+                printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
+                       " irq %d failed\n", d->scode, 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_port uport;
+        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(&uport, 0, sizeof(struct uart_port));
+
+                base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
+
+                /* Memory mapped I/O */
+                uport.iotype = UPIO_MEM;
+                uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \
+                              | UPF_BOOT_AUTOCONF;
+                /* XXX - no interrupt support yet */
+                uport.irq = 0;
+                uport.uartclk = HPAPCI_BAUD_BASE * 16;
+                uport.mapbase = base;
+                uport.membase = (char *)(base + DIO_VIRADDRBASE);
+                uport.regshift = 2;
+
+                line = serial8250_register_port(&uport);
+
+                if (line < 0) {
+                        printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
+                               " %d irq %d failed\n", i, uport.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 __devexit 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");