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, 347 insertions, 0 deletions

diff --git a/drivers/sbus/char/vfc_i2c.c b/drivers/sbus/char/vfc_i2c.c
new file mode 100644
index 000000000000..95e3cebf792c
--- /dev/null
+++ b/drivers/sbus/char/vfc_i2c.c
@@ -0,0 +1,347 @@
+/*
+ * drivers/sbus/char/vfc_i2c.c
+ *
+ * Driver for the Videopix Frame Grabber.
+ * 
+ * Functions that support the Phillips i2c(I squared C) bus on the vfc
+ *  Documentation for the Phillips I2C bus can be found on the 
+ *  phillips home page
+ *
+ * Copyright (C) 1996 Manish Vachharajani (mvachhar@noc.rutgers.edu)
+ *
+ */
+
+/* NOTE: It seems to me that the documentation regarding the
+pcd8584t/pcf8584 does not show the correct way to address the i2c bus.
+Based on the information on the I2C bus itself and the remainder of
+the Phillips docs the following algorithims apper to be correct.  I am
+fairly certain that the flowcharts in the phillips docs are wrong. */
+
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <asm/sbus.h>
+
+#if 0 
+#define VFC_I2C_DEBUG
+#endif
+
+#include "vfc.h"
+#include "vfc_i2c.h"
+
+#define WRITE_S1(__val) \
+	sbus_writel(__val, &dev->regs->i2c_s1)
+#define WRITE_REG(__val) \
+	sbus_writel(__val, &dev->regs->i2c_reg)
+
+#define VFC_I2C_READ (0x1)
+#define VFC_I2C_WRITE (0x0)
+     
+/****** 
+  The i2c bus controller chip on the VFC is a pcd8584t, but
+  phillips claims it doesn't exist.  As far as I can tell it is
+  identical to the PCF8584 so I treat it like it is the pcf8584.
+  
+  NOTE: The pcf8584 only cares
+  about the msb of the word you feed it 
+*****/
+
+int vfc_pcf8584_init(struct vfc_dev *dev) 
+{
+	/* This will also choose register S0_OWN so we can set it. */
+	WRITE_S1(RESET);
+
+	/* The pcf8584 shifts this value left one bit and uses
+	 * it as its i2c bus address.
+	 */
+	WRITE_REG(0x55000000);
+
+	/* This will set the i2c bus at the same speed sun uses,
+	 * and set another magic bit.
+	 */
+	WRITE_S1(SELECT(S2));
+	WRITE_REG(0x14000000);
+	
+	/* Enable the serial port, idle the i2c bus and set
+	 * the data reg to s0.
+	 */
+	WRITE_S1(CLEAR_I2C_BUS);
+	udelay(100);
+	return 0;
+}
+
+void vfc_i2c_delay_wakeup(struct vfc_dev *dev) 
+{
+	/* Used to profile code and eliminate too many delays */
+	VFC_I2C_DEBUG_PRINTK(("vfc%d: Delaying\n", dev->instance));
+	wake_up(&dev->poll_wait);
+}
+
+void vfc_i2c_delay_no_busy(struct vfc_dev *dev, unsigned long usecs) 
+{
+	init_timer(&dev->poll_timer);
+	dev->poll_timer.expires = jiffies + 
+		((unsigned long)usecs*(HZ))/1000000;
+	dev->poll_timer.data=(unsigned long)dev;
+	dev->poll_timer.function=(void *)(unsigned long)vfc_i2c_delay_wakeup;
+	add_timer(&dev->poll_timer);
+	sleep_on(&dev->poll_wait);
+	del_timer(&dev->poll_timer);
+}
+
+void inline vfc_i2c_delay(struct vfc_dev *dev) 
+{ 
+	vfc_i2c_delay_no_busy(dev, 100);
+}
+
+int vfc_init_i2c_bus(struct vfc_dev *dev)
+{
+	WRITE_S1(ENABLE_SERIAL | SELECT(S0) | ACK);
+	vfc_i2c_reset_bus(dev);
+	return 0;
+}
+
+int vfc_i2c_reset_bus(struct vfc_dev *dev) 
+{
+	VFC_I2C_DEBUG_PRINTK((KERN_DEBUG "vfc%d: Resetting the i2c bus\n",
+			      dev->instance));
+	if(dev == NULL)
+		return -EINVAL;
+	if(dev->regs == NULL)
+		return -EINVAL;
+	WRITE_S1(SEND_I2C_STOP);
+	WRITE_S1(SEND_I2C_STOP | ACK);
+	vfc_i2c_delay(dev);
+	WRITE_S1(CLEAR_I2C_BUS);
+	VFC_I2C_DEBUG_PRINTK((KERN_DEBUG "vfc%d: I2C status %x\n",
+			      dev->instance,
+			      sbus_readl(&dev->regs->i2c_s1)));
+	return 0;
+}
+
+int vfc_i2c_wait_for_bus(struct vfc_dev *dev) 
+{
+	int timeout = 1000; 
+
+	while(!(sbus_readl(&dev->regs->i2c_s1) & BB)) {
+		if(!(timeout--))
+			return -ETIMEDOUT;
+		vfc_i2c_delay(dev);
+	}
+	return 0;
+}
+
+int vfc_i2c_wait_for_pin(struct vfc_dev *dev, int ack)
+{
+	int timeout = 1000; 
+	int s1;
+
+	while ((s1 = sbus_readl(&dev->regs->i2c_s1)) & PIN) {
+		if (!(timeout--))
+			return -ETIMEDOUT;
+		vfc_i2c_delay(dev);
+	}
+	if (ack == VFC_I2C_ACK_CHECK) {
+		if(s1 & LRB)
+			return -EIO; 
+	}
+	return 0;
+}
+
+#define SHIFT(a) ((a) << 24)
+int vfc_i2c_xmit_addr(struct vfc_dev *dev, unsigned char addr, char mode) 
+{ 
+	int ret, raddr;
+#if 1
+	WRITE_S1(SEND_I2C_STOP | ACK);
+	WRITE_S1(SELECT(S0) | ENABLE_SERIAL);
+	vfc_i2c_delay(dev);
+#endif
+
+	switch(mode) {
+	case VFC_I2C_READ:
+		raddr = SHIFT(((unsigned int)addr | 0x1));
+		WRITE_REG(raddr);
+		VFC_I2C_DEBUG_PRINTK(("vfc%d: receiving from i2c addr 0x%x\n",
+				      dev->instance, addr | 0x1));
+		break;
+	case VFC_I2C_WRITE:
+		raddr = SHIFT((unsigned int)addr & ~0x1);
+		WRITE_REG(raddr);
+		VFC_I2C_DEBUG_PRINTK(("vfc%d: sending to i2c addr 0x%x\n",
+				      dev->instance, addr & ~0x1));
+		break;
+	default:
+		return -EINVAL;
+	};
+
+	WRITE_S1(SEND_I2C_START);
+	vfc_i2c_delay(dev);
+	ret = vfc_i2c_wait_for_pin(dev,VFC_I2C_ACK_CHECK); /* We wait
+							      for the
+							      i2c send
+							      to finish
+							      here but
+							      Sun
+							      doesn't,
+							      hmm */
+	if (ret) {
+		printk(KERN_ERR "vfc%d: VFC xmit addr timed out or no ack\n",
+		       dev->instance);
+		return ret;
+	} else if (mode == VFC_I2C_READ) {
+		if ((ret = sbus_readl(&dev->regs->i2c_reg) & 0xff000000) != raddr) {
+			printk(KERN_WARNING 
+			       "vfc%d: returned slave address "
+			       "mismatch(%x,%x)\n",
+			       dev->instance, raddr, ret);
+		}
+	}	
+	return 0;
+}
+
+int vfc_i2c_xmit_byte(struct vfc_dev *dev,unsigned char *byte) 
+{
+	int ret;
+	u32 val = SHIFT((unsigned int)*byte);
+
+	WRITE_REG(val);
+
+	ret = vfc_i2c_wait_for_pin(dev, VFC_I2C_ACK_CHECK); 
+	switch(ret) {
+	case -ETIMEDOUT: 
+		printk(KERN_ERR "vfc%d: VFC xmit byte timed out or no ack\n",
+		       dev->instance);
+		break;
+	case -EIO:
+		ret = XMIT_LAST_BYTE;
+		break;
+	default:
+		break;
+	};
+
+	return ret;
+}
+
+int vfc_i2c_recv_byte(struct vfc_dev *dev, unsigned char *byte, int last) 
+{
+	int ret;
+
+	if (last) {
+		WRITE_REG(NEGATIVE_ACK);
+		VFC_I2C_DEBUG_PRINTK(("vfc%d: sending negative ack\n",
+				      dev->instance));
+	} else {
+		WRITE_S1(ACK);
+	}
+
+	ret = vfc_i2c_wait_for_pin(dev, VFC_I2C_NO_ACK_CHECK);
+	if(ret) {
+		printk(KERN_ERR "vfc%d: "
+		       "VFC recv byte timed out\n",
+		       dev->instance);
+	}
+	*byte = (sbus_readl(&dev->regs->i2c_reg)) >> 24;
+	return ret;
+}
+
+int vfc_i2c_recvbuf(struct vfc_dev *dev, unsigned char addr,
+		    char *buf, int count)
+{
+	int ret, last;
+
+	if(!(count && buf && dev && dev->regs) )
+		return -EINVAL;
+
+	if ((ret = vfc_i2c_wait_for_bus(dev))) {
+		printk(KERN_ERR "vfc%d: VFC I2C bus busy\n", dev->instance);
+		return ret;
+	}
+
+	if ((ret = vfc_i2c_xmit_addr(dev, addr, VFC_I2C_READ))) {
+		WRITE_S1(SEND_I2C_STOP);
+		vfc_i2c_delay(dev);
+		return ret;
+	}
+	
+	last = 0;
+	while (count--) {
+		if (!count)
+			last = 1;
+		if ((ret = vfc_i2c_recv_byte(dev, buf, last))) {
+			printk(KERN_ERR "vfc%d: "
+			       "VFC error while receiving byte\n",
+			       dev->instance);
+			WRITE_S1(SEND_I2C_STOP);
+			ret = -EINVAL;
+		}
+		buf++;
+	}
+	WRITE_S1(SEND_I2C_STOP | ACK);
+	vfc_i2c_delay(dev);
+	return ret;
+}
+
+int vfc_i2c_sendbuf(struct vfc_dev *dev, unsigned char addr, 
+		    char *buf, int count) 
+{
+	int ret;
+	
+	if (!(buf && dev && dev->regs))
+		return -EINVAL;
+	
+	if ((ret = vfc_i2c_wait_for_bus(dev))) {
+		printk(KERN_ERR "vfc%d: VFC I2C bus busy\n", dev->instance);
+		return ret;
+	}
+	
+	if ((ret = vfc_i2c_xmit_addr(dev, addr, VFC_I2C_WRITE))) {
+		WRITE_S1(SEND_I2C_STOP);
+		vfc_i2c_delay(dev);
+		return ret;
+	}
+	
+	while(count--) {
+		ret = vfc_i2c_xmit_byte(dev, buf);
+		switch(ret) {
+		case XMIT_LAST_BYTE:
+			VFC_I2C_DEBUG_PRINTK(("vfc%d: "
+					      "Receiver ended transmission with "
+					      " %d bytes remaining\n",
+					      dev->instance, count));
+			ret = 0;
+			goto done;
+			break;
+		case 0:
+			break;
+		default:
+			printk(KERN_ERR "vfc%d: "
+			       "VFC error while sending byte\n", dev->instance);
+			break;
+		};
+
+		buf++;
+	}
+done:
+	WRITE_S1(SEND_I2C_STOP | ACK);
+	vfc_i2c_delay(dev);
+	return ret;
+}
+
+
+
+
+
+
+
+
+