Hi,
The following patch adds support for the OpenCores I2C controller IP
core (See http://www.opencores.org/projects.cgi/web/i2c/overview).
Signed-off-by: Peter Korsgaard <[email protected]>
---
drivers/i2c/busses/Kconfig | 11 +
drivers/i2c/busses/Makefile | 1
drivers/i2c/busses/i2c-ocores.c | 358 ++++++++++++++++++++++++++++++++++++++++
include/linux/i2c-ocores.h | 20 ++
4 files changed, 390 insertions(+)
Index: linux/drivers/i2c/busses/Kconfig
===================================================================
--- linux.orig/drivers/i2c/busses/Kconfig 2006-04-19 10:24:35.000000000 +0200
+++ linux/drivers/i2c/busses/Kconfig 2006-04-19 10:24:38.000000000 +0200
@@ -517,4 +517,15 @@
This driver can also be built as a module. If so, the module
will be called i2c-mv64xxx.
+config I2C_OCORES
+ tristate "OpenCores I2C Controller"
+ depends on I2C
+ help
+ If you say yes to this option, support will be included for the
+ OpenCores I2C controller. For details see
+ http://www.opencores.org/projects.cgi/web/i2c/overview
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-ocores.
+
endmenu
Index: linux/drivers/i2c/busses/Makefile
===================================================================
--- linux.orig/drivers/i2c/busses/Makefile 2006-03-20 06:53:29.000000000 +0100
+++ linux/drivers/i2c/busses/Makefile 2006-04-19 10:24:38.000000000 +0200
@@ -40,6 +40,7 @@
obj-$(CONFIG_I2C_VIA) += i2c-via.o
obj-$(CONFIG_I2C_VIAPRO) += i2c-viapro.o
obj-$(CONFIG_I2C_VOODOO3) += i2c-voodoo3.o
+obj-$(CONFIG_I2C_OCORES) += i2c-ocores.o
obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
Index: linux/drivers/i2c/busses/i2c-ocores.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux/drivers/i2c/busses/i2c-ocores.c 2006-04-21 10:51:05.000000000 +0200
@@ -0,0 +1,358 @@
+/*
+ * i2c-ocores.c: I2C bus driver for OpenCores I2C controller
+ * (http://www.opencores.org/projects.cgi/web/i2c/overview).
+ *
+ * Peter Korsgaard <[email protected]>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/i2c-ocores.h>
+
+struct ocores_i2c {
+ void __iomem *base;
+ int regstep;
+ wait_queue_head_t wait;
+ struct i2c_adapter adap;
+ struct i2c_msg *msg;
+ int pos;
+ int nmsgs;
+ int state; /* see STATE_ */
+};
+
+/* registers */
+#define OCI2C_PRELOW 0
+#define OCI2C_PREHIGH 1
+#define OCI2C_CONTROL 2
+#define OCI2C_DATA 3
+#define OCI2C_CMD 4
+#define OCI2C_STATUS 4
+
+#define OCI2C_CMD_START 0x91
+#define OCI2C_CMD_STOP 0x41
+#define OCI2C_CMD_READ 0x21
+#define OCI2C_CMD_WRITE 0x11
+#define OCI2C_CMD_READ_ACK 0x21
+#define OCI2C_CMD_READ_NACK 0x29
+#define OCI2C_CMD_IACK 0x01
+
+#define OCI2C_STAT_BUSY 0x40
+#define OCI2C_STAT_TIP 0x02
+#define OCI2C_STAT_NACK 0x80
+#define OCI2C_STAT_ARBLOST 0x20
+#define OCI2C_STAT_IF 0x01
+
+#define STATE_DONE 0
+#define STATE_START 1
+#define STATE_WRITE 2
+#define STATE_READ 3
+#define STATE_ERROR 4
+
+static __inline__ void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value)
+{
+ iowrite8(value, i2c->base + reg * i2c->regstep);
+}
+
+static __inline__ u8 oc_getreg(struct ocores_i2c *i2c, int reg)
+{
+ return ioread8(i2c->base + reg * i2c->regstep);
+}
+
+static void ocores_process(struct ocores_i2c *i2c)
+{
+ struct i2c_msg *msg = i2c->msg;
+ u8 stat = oc_getreg(i2c, OCI2C_STATUS);
+
+ if ((i2c->state == STATE_DONE) || (i2c->state == STATE_ERROR))
+ {
+ /* stop has been sent */
+ oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK);
+ wake_up_interruptible(&i2c->wait);
+ return;
+ }
+
+ /* error? */
+ if (stat & OCI2C_STAT_ARBLOST)
+ {
+ i2c->state = STATE_ERROR;
+ oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP);
+ return;
+ }
+
+ if ((i2c->state == STATE_START) || (i2c->state == STATE_WRITE))
+ {
+ i2c->state =
+ (msg->flags & I2C_M_RD) ? STATE_READ : STATE_WRITE;
+
+ if (stat & OCI2C_STAT_NACK)
+ {
+ i2c->state = STATE_ERROR;
+ oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP);
+ return;
+ }
+ }
+ else
+ msg->buf[i2c->pos++] = oc_getreg(i2c, OCI2C_DATA);
+
+ /* end of msg? */
+ if (i2c->pos == msg->len)
+ {
+ i2c->nmsgs--;
+ i2c->msg++;
+ i2c->pos = 0;
+ msg = i2c->msg;
+
+ if (i2c->nmsgs) /* end? */
+ {
+ /* send start? */
+ if (!(msg->flags & I2C_M_NOSTART))
+ {
+ u8 addr = (msg->addr << 1);
+
+ if (msg->flags & I2C_M_RD)
+ addr |= 1;
+
+ i2c->state = STATE_START;
+
+ oc_setreg(i2c, OCI2C_DATA, addr);
+ oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START);
+ return;
+ }
+ else
+ i2c->state = (msg->flags & I2C_M_RD)
+ ? STATE_READ : STATE_WRITE;
+ }
+ else
+ {
+ i2c->state = STATE_DONE;
+ oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP);
+ return;
+ }
+ }
+
+ if (i2c->state == STATE_READ)
+ {
+ oc_setreg(i2c, OCI2C_CMD, i2c->pos == (msg->len-1) ?
+ OCI2C_CMD_READ_NACK : OCI2C_CMD_READ_ACK);
+ }
+ else
+ {
+ oc_setreg(i2c, OCI2C_DATA, msg->buf[i2c->pos++]);
+ oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_WRITE);
+ }
+}
+
+static irqreturn_t ocores_isr(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct ocores_i2c *i2c = dev_id;
+
+ ocores_process(i2c);
+
+ return IRQ_HANDLED;
+}
+
+static int ocores_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+{
+ struct ocores_i2c *i2c = i2c_get_adapdata(adap);
+
+ i2c->msg = msgs;
+ i2c->pos = 0;
+ i2c->nmsgs = num;
+ i2c->state = STATE_START;
+
+ oc_setreg(i2c, OCI2C_DATA,
+ (i2c->msg->addr << 1) |
+ ((i2c->msg->flags & I2C_M_RD) ? 1:0));
+
+ oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START);
+
+ if (wait_event_interruptible_timeout(i2c->wait,
+ (i2c->state == STATE_ERROR) ||
+ (i2c->state == STATE_DONE), HZ*5))
+ return (i2c->state == STATE_DONE) ? num : -EIO;
+ else
+ return -ETIMEDOUT;
+}
+
+static void ocores_init(struct ocores_i2c *i2c,
+ struct ocores_i2c_platform_data *pdata)
+{
+ int prescale;
+
+ /* make sure the device is disabled */
+ oc_setreg(i2c, OCI2C_CONTROL, 0);
+
+ prescale = (pdata->clock_khz / (5*100)) - 1;
+ oc_setreg(i2c, OCI2C_PRELOW, prescale & 0xff);
+ oc_setreg(i2c, OCI2C_PREHIGH, prescale >> 8);
+
+ /* Init the device */
+ oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK);
+ oc_setreg(i2c, OCI2C_CONTROL, 0xc0);
+}
+
+
+static u32 ocores_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm ocores_algorithm = {
+ .master_xfer = ocores_xfer,
+ .functionality = ocores_func,
+};
+
+static struct i2c_adapter ocores_adapter = {
+ .owner = THIS_MODULE,
+ .name = "i2c-ocores",
+ .class = I2C_CLASS_HWMON,
+ .algo = &ocores_algorithm,
+ .timeout = 2,
+ .retries = 1
+};
+
+
+static int __devinit ocores_i2c_probe(struct platform_device *pdev)
+{
+ struct ocores_i2c* i2c;
+ struct ocores_i2c_platform_data* pdata;
+ struct resource *res, *res2;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res2)
+ return -ENODEV;
+
+ pdata = (struct ocores_i2c_platform_data*) pdev->dev.platform_data;
+ if (!pdata)
+ return -ENODEV;
+
+ i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
+ if (!i2c)
+ return -ENOMEM;
+
+ if (!request_mem_region(res->start, res->end - res->start + 1,
+ pdev->name)) {
+ dev_err(&pdev->dev, "Memory region busy\n");
+ ret = -EBUSY;
+ goto request_mem_failed;
+ }
+
+ i2c->base = ioremap(res->start, res->end - res->start + 1);
+ if (!i2c->base)
+ {
+ dev_err(&pdev->dev, "Unable to map registers\n");
+ ret = -EIO;
+ goto map_failed;
+ }
+
+ i2c->regstep = pdata->regstep;
+ ocores_init(i2c, pdata);
+
+ init_waitqueue_head(&i2c->wait);
+ ret = request_irq(res2->start, ocores_isr, 0,
+ pdev->name, i2c);
+ if (ret)
+ {
+ dev_err(&pdev->dev, "Cannot claim IRQ\n");
+ goto request_irq_failed;
+ }
+
+ /* hook up driver to tree */
+ platform_set_drvdata(pdev, i2c);
+ i2c->adap = ocores_adapter;
+ i2c_set_adapdata(&i2c->adap, i2c);
+ i2c->adap.dev.parent = &pdev->dev;
+
+ /* add i2c adapter to i2c tree */
+ ret = i2c_add_adapter(&i2c->adap);
+ if (ret)
+ {
+ dev_err(&pdev->dev, "Failed to add adapter\n");
+ goto add_adapter_failed;
+ }
+
+ return 0;
+
+ add_adapter_failed:
+ free_irq(res2->start, i2c);
+ request_irq_failed:
+ iounmap(i2c->base);
+ map_failed:
+ release_mem_region(res->start, res->end - res->start + 1);
+ request_mem_failed:
+ kfree(i2c);
+
+ return ret;
+}
+
+static int __devexit ocores_i2c_remove(struct platform_device* pdev)
+{
+ struct ocores_i2c *i2c = platform_get_drvdata(pdev);
+ struct resource *res;
+
+ /* disable i2c logic */
+ oc_setreg(i2c, OCI2C_CONTROL, 0);
+
+ /* remove adapter & data */
+ i2c_del_adapter(&i2c->adap);
+ platform_set_drvdata(pdev, NULL);
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (res)
+ free_irq(res->start, i2c);
+
+ iounmap(i2c->base);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res)
+ release_mem_region(res->start, res->end - res->start + 1);
+
+ kfree(i2c);
+
+ return 0;
+}
+
+static struct platform_driver ocores_i2c_driver = {
+ .probe = ocores_i2c_probe,
+ .remove = ocores_i2c_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "ocores-i2c",
+ },
+};
+
+static int __init ocores_i2c_init(void)
+{
+ return platform_driver_register(&ocores_i2c_driver);
+}
+
+static void __exit ocores_i2c_exit(void)
+{
+ platform_driver_unregister(&ocores_i2c_driver);
+}
+
+module_init(ocores_i2c_init);
+module_exit(ocores_i2c_exit);
+
+MODULE_AUTHOR("Peter Korsgaard <[email protected]>");
+MODULE_DESCRIPTION("OpenCores I2C bus driver");
+MODULE_LICENSE("GPL");
Index: linux/include/linux/i2c-ocores.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux/include/linux/i2c-ocores.h 2006-04-21 10:54:43.000000000 +0200
@@ -0,0 +1,20 @@
+/*
+ * i2c-ocores.h - definitions for the i2c-ocores interface
+ *
+ * Peter Korsgaard <[email protected]>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#ifndef _LINUX_I2C_OCORES_H
+#define _LINUX_I2C_OCORES_H
+
+struct ocores_i2c_platform_data {
+ u32 regstep; /* distance between registers */
+ u32 clock_khz; /* input clock in KHz */
+};
+
+#endif /* _LINUX_I2C_OCORES_H */
+
--
Bye, Peter Korsgaard
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