Linux-2.6.12-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!
diff --git a/drivers/i2c/busses/i2c-elektor.c b/drivers/i2c/busses/i2c-elektor.c
new file mode 100644
index 0000000..0a77200
--- /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);