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, 295 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-elektor.c b/drivers/i2c/busses/i2c-elektor.c
new file mode 100644
index 00000000000..0a7720000a0
--- /dev/null
+++ b/drivers/i2c/busses/i2c-elektor.c
@@ -0,0 +1,295 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-elektor.c i2c-hw access for PCF8584 style isa bus adaptes             */
+/* ------------------------------------------------------------------------- */
+/*   Copyright (C) 1995-97 Simon G. Vogl
+                   1998-99 Hans Berglund
+
+    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.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.		     */
+/* ------------------------------------------------------------------------- */
+
+/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
+   Frodo Looijaard <frodol@dds.nl> */
+
+/* Partialy rewriten by Oleg I. Vdovikin for mmapped support of 
+   for Alpha Processor Inc. UP-2000(+) boards */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/wait.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-pcf.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include "../algos/i2c-algo-pcf.h"
+
+#define DEFAULT_BASE 0x330
+
+static int base;
+static int irq;
+static int clock  = 0x1c;
+static int own    = 0x55;
+static int mmapped;
+
+/* vdovikin: removed static struct i2c_pcf_isa gpi; code - 
+  this module in real supports only one device, due to missing arguments
+  in some functions, called from the algo-pcf module. Sometimes it's
+  need to be rewriten - but for now just remove this for simpler reading */
+
+static wait_queue_head_t pcf_wait;
+static int pcf_pending;
+static spinlock_t lock;
+
+/* ----- local functions ----------------------------------------------	*/
+
+static void pcf_isa_setbyte(void *data, int ctl, int val)
+{
+	int address = ctl ? (base + 1) : base;
+
+	/* enable irq if any specified for serial operation */
+	if (ctl && irq && (val & I2C_PCF_ESO)) {
+		val |= I2C_PCF_ENI;
+	}
+
+	pr_debug("i2c-elektor: Write 0x%X 0x%02X\n", address, val & 255);
+
+	switch (mmapped) {
+	case 0: /* regular I/O */
+		outb(val, address);
+		break;
+	case 2: /* double mapped I/O needed for UP2000 board,
+                   I don't know why this... */
+		writeb(val, (void *)address);
+		/* fall */
+	case 1: /* memory mapped I/O */
+		writeb(val, (void *)address);
+		break;
+	}
+}
+
+static int pcf_isa_getbyte(void *data, int ctl)
+{
+	int address = ctl ? (base + 1) : base;
+	int val = mmapped ? readb((void *)address) : inb(address);
+
+	pr_debug("i2c-elektor: Read 0x%X 0x%02X\n", address, val);
+
+	return (val);
+}
+
+static int pcf_isa_getown(void *data)
+{
+	return (own);
+}
+
+
+static int pcf_isa_getclock(void *data)
+{
+	return (clock);
+}
+
+static void pcf_isa_waitforpin(void) {
+	DEFINE_WAIT(wait);
+	int timeout = 2;
+	unsigned long flags;
+
+	if (irq > 0) {
+		spin_lock_irqsave(&lock, flags);
+		if (pcf_pending == 0) {
+			spin_unlock_irqrestore(&lock, flags);
+			prepare_to_wait(&pcf_wait, &wait, TASK_INTERRUPTIBLE);
+			if (schedule_timeout(timeout*HZ)) {
+				spin_lock_irqsave(&lock, flags);
+				if (pcf_pending == 1) {
+					pcf_pending = 0;
+				}
+				spin_unlock_irqrestore(&lock, flags);
+			}
+			finish_wait(&pcf_wait, &wait);
+		} else {
+			pcf_pending = 0;
+			spin_unlock_irqrestore(&lock, flags);
+		}
+	} else {
+		udelay(100);
+	}
+}
+
+
+static irqreturn_t pcf_isa_handler(int this_irq, void *dev_id, struct pt_regs *regs) {
+	spin_lock(&lock);
+	pcf_pending = 1;
+	spin_unlock(&lock);
+	wake_up_interruptible(&pcf_wait);
+	return IRQ_HANDLED;
+}
+
+
+static int pcf_isa_init(void)
+{
+	spin_lock_init(&lock);
+	if (!mmapped) {
+		if (!request_region(base, 2, "i2c (isa bus adapter)")) {
+			printk(KERN_ERR
+			       "i2c-elektor: requested I/O region (0x%X:2) "
+			       "is in use.\n", base);
+			return -ENODEV;
+		}
+	}
+	if (irq > 0) {
+		if (request_irq(irq, pcf_isa_handler, 0, "PCF8584", NULL) < 0) {
+			printk(KERN_ERR "i2c-elektor: Request irq%d failed\n", irq);
+			irq = 0;
+		} else
+			enable_irq(irq);
+	}
+	return 0;
+}
+
+/* ------------------------------------------------------------------------
+ * Encapsulate the above functions in the correct operations structure.
+ * This is only done when more than one hardware adapter is supported.
+ */
+static struct i2c_algo_pcf_data pcf_isa_data = {
+	.setpcf	    = pcf_isa_setbyte,
+	.getpcf	    = pcf_isa_getbyte,
+	.getown	    = pcf_isa_getown,
+	.getclock   = pcf_isa_getclock,
+	.waitforpin = pcf_isa_waitforpin,
+	.udelay	    = 10,
+	.mdelay	    = 10,
+	.timeout    = 100,
+};
+
+static struct i2c_adapter pcf_isa_ops = {
+	.owner		= THIS_MODULE,
+	.class		= I2C_CLASS_HWMON,
+	.id		= I2C_HW_P_ELEK,
+	.algo_data	= &pcf_isa_data,
+	.name		= "PCF8584 ISA adapter",
+};
+
+static int __init i2c_pcfisa_init(void) 
+{
+#ifdef __alpha__
+	/* check to see we have memory mapped PCF8584 connected to the 
+	Cypress cy82c693 PCI-ISA bridge as on UP2000 board */
+	if (base == 0) {
+		struct pci_dev *cy693_dev;
+		
+		cy693_dev = pci_get_device(PCI_VENDOR_ID_CONTAQ, 
+					   PCI_DEVICE_ID_CONTAQ_82C693, NULL);
+		if (cy693_dev) {
+			char config;
+			/* yeap, we've found cypress, let's check config */
+			if (!pci_read_config_byte(cy693_dev, 0x47, &config)) {
+				
+				pr_debug("i2c-elektor: found cy82c693, config register 0x47 = 0x%02x.\n", config);
+
+				/* UP2000 board has this register set to 0xe1,
+                                   but the most significant bit as seems can be 
+				   reset during the proper initialisation
+                                   sequence if guys from API decides to do that
+                                   (so, we can even enable Tsunami Pchip
+                                   window for the upper 1 Gb) */
+
+				/* so just check for ROMCS at 0xe0000,
+                                   ROMCS enabled for writes
+				   and external XD Bus buffer in use. */
+				if ((config & 0x7f) == 0x61) {
+					/* seems to be UP2000 like board */
+					base = 0xe0000;
+                                        /* I don't know why we need to
+                                           write twice */
+					mmapped = 2;
+                                        /* UP2000 drives ISA with
+					   8.25 MHz (PCI/4) clock
+					   (this can be read from cypress) */
+					clock = I2C_PCF_CLK | I2C_PCF_TRNS90;
+					printk(KERN_INFO "i2c-elektor: found API UP2000 like board, will probe PCF8584 later.\n");
+				}
+			}
+			pci_dev_put(cy693_dev);
+		}
+	}
+#endif
+
+	/* sanity checks for mmapped I/O */
+	if (mmapped && base < 0xc8000) {
+		printk(KERN_ERR "i2c-elektor: incorrect base address (0x%0X) specified for mmapped I/O.\n", base);
+		return -ENODEV;
+	}
+
+	printk(KERN_INFO "i2c-elektor: i2c pcf8584-isa adapter driver\n");
+
+	if (base == 0) {
+		base = DEFAULT_BASE;
+	}
+
+	init_waitqueue_head(&pcf_wait);
+	if (pcf_isa_init())
+		return -ENODEV;
+	if (i2c_pcf_add_bus(&pcf_isa_ops) < 0)
+		goto fail;
+	
+	printk(KERN_ERR "i2c-elektor: found device at %#x.\n", base);
+
+	return 0;
+
+ fail:
+	if (irq > 0) {
+		disable_irq(irq);
+		free_irq(irq, NULL);
+	}
+
+	if (!mmapped)
+		release_region(base , 2);
+	return -ENODEV;
+}
+
+static void i2c_pcfisa_exit(void)
+{
+	i2c_pcf_del_bus(&pcf_isa_ops);
+
+	if (irq > 0) {
+		disable_irq(irq);
+		free_irq(irq, NULL);
+	}
+
+	if (!mmapped)
+		release_region(base , 2);
+}
+
+MODULE_AUTHOR("Hans Berglund <hb@spacetec.no>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for PCF8584 ISA bus adapter");
+MODULE_LICENSE("GPL");
+
+module_param(base, int, 0);
+module_param(irq, int, 0);
+module_param(clock, int, 0);
+module_param(own, int, 0);
+module_param(mmapped, int, 0);
+
+module_init(i2c_pcfisa_init);
+module_exit(i2c_pcfisa_exit);