Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 437 insertions, 0 deletions

diff --git a/drivers/parport/parport_gsc.c b/drivers/parport/parport_gsc.c
new file mode 100644
index 000000000000..02d72acd1c89
--- /dev/null
+++ b/drivers/parport/parport_gsc.c
@@ -0,0 +1,437 @@
+/*
+ *      Low-level parallel-support for PC-style hardware integrated in the 
+ *      LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ *      (C) 1999-2001 by Helge Deller <deller@gmx.de>
+ *
+ * 
+ * based on parport_pc.c by 
+ *          Grant Guenther <grant@torque.net>
+ *          Phil Blundell <philb@gnu.org>
+ *          Tim Waugh <tim@cyberelk.demon.co.uk>
+ *          Jose Renau <renau@acm.org>
+ *          David Campbell <campbell@torque.net>
+ *          Andrea Arcangeli
+ */
+
+#undef DEBUG    /* undef for production */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/sysctl.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/uaccess.h>
+#include <asm/superio.h>
+
+#include <linux/parport.h>
+#include <asm/pdc.h>
+#include <asm/parisc-device.h>
+#include <asm/hardware.h>
+#include "parport_gsc.h"
+
+
+MODULE_AUTHOR("Helge Deller <deller@gmx.de>");
+MODULE_DESCRIPTION("HP-PARISC PC-style parallel port driver");
+MODULE_SUPPORTED_DEVICE("integrated PC-style parallel port");
+MODULE_LICENSE("GPL");
+
+
+/*
+ * Clear TIMEOUT BIT in EPP MODE
+ *
+ * This is also used in SPP detection.
+ */
+static int clear_epp_timeout(struct parport *pb)
+{
+        unsigned char r;
+
+        if (!(parport_gsc_read_status(pb) & 0x01))
+                return 1;
+
+        /* To clear timeout some chips require double read */
+        parport_gsc_read_status(pb);
+        r = parport_gsc_read_status(pb);
+        parport_writeb (r | 0x01, STATUS (pb)); /* Some reset by writing 1 */
+        parport_writeb (r & 0xfe, STATUS (pb)); /* Others by writing 0 */
+        r = parport_gsc_read_status(pb);
+
+        return !(r & 0x01);
+}
+
+/*
+ * Access functions.
+ *
+ * Most of these aren't static because they may be used by the
+ * parport_xxx_yyy macros.  extern __inline__ versions of several
+ * of these are in parport_gsc.h.
+ */
+
+static irqreturn_t parport_gsc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        parport_generic_irq(irq, (struct parport *) dev_id, regs);
+        return IRQ_HANDLED;
+}
+
+void parport_gsc_init_state(struct pardevice *dev, struct parport_state *s)
+{
+        s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
+}
+
+void parport_gsc_save_state(struct parport *p, struct parport_state *s)
+{
+        s->u.pc.ctr = parport_readb (CONTROL (p));
+}
+
+void parport_gsc_restore_state(struct parport *p, struct parport_state *s)
+{
+        parport_writeb (s->u.pc.ctr, CONTROL (p));
+}
+
+struct parport_operations parport_gsc_ops = 
+{
+        .write_data     = parport_gsc_write_data,
+        .read_data      = parport_gsc_read_data,
+
+        .write_control  = parport_gsc_write_control,
+        .read_control   = parport_gsc_read_control,
+        .frob_control   = parport_gsc_frob_control,
+
+        .read_status    = parport_gsc_read_status,
+
+        .enable_irq     = parport_gsc_enable_irq,
+        .disable_irq    = parport_gsc_disable_irq,
+
+        .data_forward   = parport_gsc_data_forward,
+        .data_reverse   = parport_gsc_data_reverse,
+
+        .init_state     = parport_gsc_init_state,
+        .save_state     = parport_gsc_save_state,
+        .restore_state  = parport_gsc_restore_state,
+
+        .epp_write_data = parport_ieee1284_epp_write_data,
+        .epp_read_data  = parport_ieee1284_epp_read_data,
+        .epp_write_addr = parport_ieee1284_epp_write_addr,
+        .epp_read_addr  = parport_ieee1284_epp_read_addr,
+
+        .ecp_write_data = parport_ieee1284_ecp_write_data,
+        .ecp_read_data  = parport_ieee1284_ecp_read_data,
+        .ecp_write_addr = parport_ieee1284_ecp_write_addr,
+
+        .compat_write_data      = parport_ieee1284_write_compat,
+        .nibble_read_data       = parport_ieee1284_read_nibble,
+        .byte_read_data         = parport_ieee1284_read_byte,
+
+        .owner          = THIS_MODULE,
+};
+
+/* --- Mode detection ------------------------------------- */
+
+/*
+ * Checks for port existence, all ports support SPP MODE
+ */
+static int __devinit parport_SPP_supported(struct parport *pb)
+{
+        unsigned char r, w;
+
+        /*
+         * first clear an eventually pending EPP timeout 
+         * I (sailer@ife.ee.ethz.ch) have an SMSC chipset
+         * that does not even respond to SPP cycles if an EPP
+         * timeout is pending
+         */
+        clear_epp_timeout(pb);
+
+        /* Do a simple read-write test to make sure the port exists. */
+        w = 0xc;
+        parport_writeb (w, CONTROL (pb));
+
+        /* Is there a control register that we can read from?  Some
+         * ports don't allow reads, so read_control just returns a
+         * software copy. Some ports _do_ allow reads, so bypass the
+         * software copy here.  In addition, some bits aren't
+         * writable. */
+        r = parport_readb (CONTROL (pb));
+        if ((r & 0xf) == w) {
+                w = 0xe;
+                parport_writeb (w, CONTROL (pb));
+                r = parport_readb (CONTROL (pb));
+                parport_writeb (0xc, CONTROL (pb));
+                if ((r & 0xf) == w)
+                        return PARPORT_MODE_PCSPP;
+        }
+
+        /* Try the data register.  The data lines aren't tri-stated at
+         * this stage, so we expect back what we wrote. */
+        w = 0xaa;
+        parport_gsc_write_data (pb, w);
+        r = parport_gsc_read_data (pb);
+        if (r == w) {
+                w = 0x55;
+                parport_gsc_write_data (pb, w);
+                r = parport_gsc_read_data (pb);
+                if (r == w)
+                        return PARPORT_MODE_PCSPP;
+        }
+
+        return 0;
+}
+
+/* Detect PS/2 support.
+ *
+ * Bit 5 (0x20) sets the PS/2 data direction; setting this high
+ * allows us to read data from the data lines.  In theory we would get back
+ * 0xff but any peripheral attached to the port may drag some or all of the
+ * lines down to zero.  So if we get back anything that isn't the contents
+ * of the data register we deem PS/2 support to be present. 
+ *
+ * Some SPP ports have "half PS/2" ability - you can't turn off the line
+ * drivers, but an external peripheral with sufficiently beefy drivers of
+ * its own can overpower them and assert its own levels onto the bus, from
+ * where they can then be read back as normal.  Ports with this property
+ * and the right type of device attached are likely to fail the SPP test,
+ * (as they will appear to have stuck bits) and so the fact that they might
+ * be misdetected here is rather academic. 
+ */
+
+static int __devinit parport_PS2_supported(struct parport *pb)
+{
+        int ok = 0;
+  
+        clear_epp_timeout(pb);
+
+        /* try to tri-state the buffer */
+        parport_gsc_data_reverse (pb);
+        
+        parport_gsc_write_data(pb, 0x55);
+        if (parport_gsc_read_data(pb) != 0x55) ok++;
+
+        parport_gsc_write_data(pb, 0xaa);
+        if (parport_gsc_read_data(pb) != 0xaa) ok++;
+
+        /* cancel input mode */
+        parport_gsc_data_forward (pb);
+
+        if (ok) {
+                pb->modes |= PARPORT_MODE_TRISTATE;
+        } else {
+                struct parport_gsc_private *priv = pb->private_data;
+                priv->ctr_writable &= ~0x20;
+        }
+
+        return ok;
+}
+
+
+/* --- Initialisation code -------------------------------- */
+
+struct parport *__devinit parport_gsc_probe_port (unsigned long base,
+                                                 unsigned long base_hi,
+                                                 int irq, int dma,
+                                                 struct pci_dev *dev)
+{
+        struct parport_gsc_private *priv;
+        struct parport_operations *ops;
+        struct parport tmp;
+        struct parport *p = &tmp;
+
+        priv = kmalloc (sizeof (struct parport_gsc_private), GFP_KERNEL);
+        if (!priv) {
+                printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base);
+                return NULL;
+        }
+        ops = kmalloc (sizeof (struct parport_operations), GFP_KERNEL);
+        if (!ops) {
+                printk (KERN_DEBUG "parport (0x%lx): no memory for ops!\n",
+                        base);
+                kfree (priv);
+                return NULL;
+        }
+        memcpy (ops, &parport_gsc_ops, sizeof (struct parport_operations));
+        priv->ctr = 0xc;
+        priv->ctr_writable = 0xff;
+        priv->dma_buf = 0;
+        priv->dma_handle = 0;
+        priv->dev = dev;
+        p->base = base;
+        p->base_hi = base_hi;
+        p->irq = irq;
+        p->dma = dma;
+        p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
+        p->ops = ops;
+        p->private_data = priv;
+        p->physport = p;
+        if (!parport_SPP_supported (p)) {
+                /* No port. */
+                kfree (priv);
+                return NULL;
+        }
+        parport_PS2_supported (p);
+
+        if (!(p = parport_register_port(base, PARPORT_IRQ_NONE,
+                                        PARPORT_DMA_NONE, ops))) {
+                kfree (priv);
+                kfree (ops);
+                return NULL;
+        }
+
+        p->base_hi = base_hi;
+        p->modes = tmp.modes;
+        p->size = (p->modes & PARPORT_MODE_EPP)?8:3;
+        p->private_data = priv;
+
+        printk(KERN_INFO "%s: PC-style at 0x%lx", p->name, p->base);
+        p->irq = irq;
+        if (p->irq == PARPORT_IRQ_AUTO) {
+                p->irq = PARPORT_IRQ_NONE;
+        }
+        if (p->irq != PARPORT_IRQ_NONE) {
+                printk(", irq %d", p->irq);
+
+                if (p->dma == PARPORT_DMA_AUTO) {
+                        p->dma = PARPORT_DMA_NONE;
+                }
+        }
+        if (p->dma == PARPORT_DMA_AUTO) /* To use DMA, giving the irq
+                                           is mandatory (see above) */
+                p->dma = PARPORT_DMA_NONE;
+
+        printk(" [");
+#define printmode(x) {if(p->modes&PARPORT_MODE_##x){printk("%s%s",f?",":"",#x);f++;}}
+        {
+                int f = 0;
+                printmode(PCSPP);
+                printmode(TRISTATE);
+                printmode(COMPAT)
+                printmode(EPP);
+//              printmode(ECP);
+//              printmode(DMA);
+        }
+#undef printmode
+        printk("]\n");
+
+        if (p->irq != PARPORT_IRQ_NONE) {
+                if (request_irq (p->irq, parport_gsc_interrupt,
+                                 0, p->name, p)) {
+                        printk (KERN_WARNING "%s: irq %d in use, "
+                                "resorting to polled operation\n",
+                                p->name, p->irq);
+                        p->irq = PARPORT_IRQ_NONE;
+                        p->dma = PARPORT_DMA_NONE;
+                }
+        }
+
+        /* Done probing.  Now put the port into a sensible start-up state. */
+
+        parport_gsc_write_data(p, 0);
+        parport_gsc_data_forward (p);
+
+        /* Now that we've told the sharing engine about the port, and
+           found out its characteristics, let the high-level drivers
+           know about it. */
+        parport_announce_port (p);
+
+        return p;
+}
+
+
+#define PARPORT_GSC_OFFSET 0x800
+
+static int __initdata parport_count;
+
+static int __devinit parport_init_chip(struct parisc_device *dev)
+{
+        struct parport *p;
+        unsigned long port;
+
+        if (!dev->irq) {
+                printk("IRQ not found for parallel device at 0x%lx\n", dev->hpa);
+                return -ENODEV;
+        }
+
+        port = dev->hpa + PARPORT_GSC_OFFSET;
+        
+        /* some older machines with ASP-chip don't support
+         * the enhanced parport modes.
+         */
+        if (boot_cpu_data.cpu_type > pcxt && !pdc_add_valid(port+4)) {
+
+                /* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */
+                printk("%s: initialize bidirectional-mode.\n", __FUNCTION__);
+                parport_writeb ( (0x10 + 0x20), port + 4);
+
+        } else {
+                printk("%s: enhanced parport-modes not supported.\n", __FUNCTION__);
+        }
+        
+        p = parport_gsc_probe_port(port, 0, dev->irq,
+                        /* PARPORT_IRQ_NONE */ PARPORT_DMA_NONE, NULL);
+        if (p)
+                parport_count++;
+        dev->dev.driver_data = p;
+
+        return 0;
+}
+
+static int __devexit parport_remove_chip(struct parisc_device *dev)
+{
+        struct parport *p = dev->dev.driver_data;
+        if (p) {
+                struct parport_gsc_private *priv = p->private_data;
+                struct parport_operations *ops = p->ops;
+                parport_remove_port(p);
+                if (p->dma != PARPORT_DMA_NONE)
+                        free_dma(p->dma);
+                if (p->irq != PARPORT_IRQ_NONE)
+                        free_irq(p->irq, p);
+                if (priv->dma_buf)
+                        pci_free_consistent(priv->dev, PAGE_SIZE,
+                                            priv->dma_buf,
+                                            priv->dma_handle);
+                kfree (p->private_data);
+                parport_put_port(p);
+                kfree (ops); /* hope no-one cached it */
+        }
+        return 0;
+}
+
+static struct parisc_device_id parport_tbl[] = {
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x74 },
+        { 0, }
+};
+
+MODULE_DEVICE_TABLE(parisc, parport_tbl);
+
+static struct parisc_driver parport_driver = {
+        .name           = "Parallel",
+        .id_table       = parport_tbl,
+        .probe          = parport_init_chip,
+        .remove         = __devexit_p(parport_remove_chip),
+};
+
+int __devinit parport_gsc_init(void)
+{
+        return register_parisc_driver(&parport_driver);
+}
+
+static void __devexit parport_gsc_exit(void)
+{
+        unregister_parisc_driver(&parport_driver);
+}
+
+module_init(parport_gsc_init);
+module_exit(parport_gsc_exit);