Re: [PATCH][I2C] Marvell mv64xxx i2c driver
From: Mark A. Greer
Date: Wed Jan 26 2005 - 19:35:00 EST
Greg KH wrote:
Please put <asm/ after <linux/
Done.
You have a lot of pr_debug and other printk() for stuff in this driver.
Please use dev_dbg(), dev_err() and friends instead. That way you get a
consistant message, that points to the exact device that is causing the
message.
Cool. Done.
You have some big inline functions here. Should they really be inline?
We aren't really worried about speed here, right? Size is probably a
bigger issue.
No, no, and done.
Is this header file really needed? Does any other file other than this
single driver ever include it? If not, please just put it into the
driver itself.
No, no, and done.
Included is an *incremental* patch that I hope addresses your concerns.
Thanks Greg.
Mark
--
diff -Nru a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
--- a/drivers/i2c/busses/i2c-mv64xxx.c 2005-01-26 16:52:56 -07:00
+++ b/drivers/i2c/busses/i2c-mv64xxx.c 2005-01-26 16:52:56 -07:00
@@ -11,21 +11,94 @@
* 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/pci.h>
-#include <linux/wait.h>
#include <linux/spinlock.h>
-#include <asm/io.h>
-#include <asm/ocp.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
-#include <linux/delay.h>
#include <linux/mv643xx.h>
-#include "i2c-mv64xxx.h"
+#include <asm/io.h>
+
+/* Register defines */
+#define MV64XXX_I2C_REG_SLAVE_ADDR 0x00
+#define MV64XXX_I2C_REG_DATA 0x04
+#define MV64XXX_I2C_REG_CONTROL 0x08
+#define MV64XXX_I2C_REG_STATUS 0x0c
+#define MV64XXX_I2C_REG_BAUD 0x0c
+#define MV64XXX_I2C_REG_EXT_SLAVE_ADDR 0x10
+#define MV64XXX_I2C_REG_SOFT_RESET 0x1c
+
+#define MV64XXX_I2C_REG_CONTROL_ACK 0x00000004
+#define MV64XXX_I2C_REG_CONTROL_IFLG 0x00000008
+#define MV64XXX_I2C_REG_CONTROL_STOP 0x00000010
+#define MV64XXX_I2C_REG_CONTROL_START 0x00000020
+#define MV64XXX_I2C_REG_CONTROL_TWSIEN 0x00000040
+#define MV64XXX_I2C_REG_CONTROL_INTEN 0x00000080
+
+/* Ctlr status values */
+#define MV64XXX_I2C_STATUS_BUS_ERR 0x00
+#define MV64XXX_I2C_STATUS_MAST_START 0x08
+#define MV64XXX_I2C_STATUS_MAST_REPEAT_START 0x10
+#define MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK 0x18
+#define MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK 0x20
+#define MV64XXX_I2C_STATUS_MAST_WR_ACK 0x28
+#define MV64XXX_I2C_STATUS_MAST_WR_NO_ACK 0x30
+#define MV64XXX_I2C_STATUS_MAST_LOST_ARB 0x38
+#define MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK 0x40
+#define MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK 0x48
+#define MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK 0x50
+#define MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK 0x58
+#define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK 0xd0
+#define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_NO_ACK 0xd8
+#define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK 0xe0
+#define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_NO_ACK 0xe8
+#define MV64XXX_I2C_STATUS_NO_STATUS 0xf8
+
+/* Driver states */
+enum {
+ MV64XXX_I2C_STATE_INVALID,
+ MV64XXX_I2C_STATE_IDLE,
+ MV64XXX_I2C_STATE_WAITING_FOR_START_COND,
+ MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK,
+ MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK,
+ MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK,
+ MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA,
+ MV64XXX_I2C_STATE_ABORTING,
+};
+
+/* Driver actions */
+enum {
+ MV64XXX_I2C_ACTION_INVALID,
+ MV64XXX_I2C_ACTION_CONTINUE,
+ MV64XXX_I2C_ACTION_SEND_START,
+ MV64XXX_I2C_ACTION_SEND_ADDR_1,
+ MV64XXX_I2C_ACTION_SEND_ADDR_2,
+ MV64XXX_I2C_ACTION_SEND_DATA,
+ MV64XXX_I2C_ACTION_RCV_DATA,
+ MV64XXX_I2C_ACTION_RCV_DATA_STOP,
+ MV64XXX_I2C_ACTION_SEND_STOP,
+};
+
+struct mv64xxx_i2c_data {
+ int irq;
+ uint state;
+ uint action;
+ u32 cntl_bits;
+ void *reg_base;
+ ulong reg_base_p;
+ u32 addr1;
+ u32 addr2;
+ uint bytes_left;
+ uint byte_posn;
+ uint block;
+ int rc;
+ u32 freq_m;
+ u32 freq_n;
+ wait_queue_head_t waitq;
+ spinlock_t lock;
+ struct i2c_msg *msg;
+ struct i2c_adapter adapter;
+};
/*
*****************************************************************************
@@ -34,12 +107,9 @@
*
*****************************************************************************
*/
-static inline void
+static void
mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
{
- pr_debug("mv64xxx_i2c_fsm: ENTER--state: %d, status: 0x%x\n",
- drv_data->state, status);
-
/*
* If state is idle, then this is likely the remnants of an old
* operation that driver has given up on or the user has killed.
@@ -48,14 +118,12 @@
if (drv_data->state == MV64XXX_I2C_STATE_IDLE) {
drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
drv_data->state = MV64XXX_I2C_STATE_IDLE;
- pr_debug("mv64xxx_i2c_fsm: EXIT--Entered when in IDLE state\n");
return;
}
if (drv_data->state == MV64XXX_I2C_STATE_ABORTING) {
drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
drv_data->state = MV64XXX_I2C_STATE_IDLE;
- pr_debug("mv64xxx_i2c_fsm: EXIT--Aborting\n");
return;
}
@@ -135,27 +203,22 @@
break;
default:
- printk(KERN_ERR "mv64xxx_i2c_fsm: Ctlr Error -- "
- "state: 0x%x, status: 0x%x\n", drv_data->state, status);
- printk(KERN_INFO "addr: 0x%x, flags: 0x%x\n",
- drv_data->msg->addr, drv_data->msg->flags);
+ dev_err(&drv_data->adapter.dev,
+ "mv64xxx_i2c_fsm: Ctlr Error -- state: 0x%x, "
+ "status: 0x%x, addr: 0x%x, flags: 0x%x\n",
+ drv_data->state, status, drv_data->msg->addr,
+ drv_data->msg->flags);
drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
drv_data->state = MV64XXX_I2C_STATE_IDLE;
drv_data->rc = -EIO;
}
- pr_debug("mv64xxx_i2c_fsm: EXIT--action: %d, state: %d, rc: 0x%x\n",
- drv_data->action, drv_data->state, drv_data->rc);
return;
}
static void
mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
{
- pr_debug("mv64xxx_i2c_do_action: ENTER--action: %d, state: %d, "
- "cntl: 0x%x\n", drv_data->action, drv_data->state,
- drv_data->cntl_bits);
-
switch(drv_data->action) {
case MV64XXX_I2C_ACTION_CONTINUE:
writel(drv_data->cntl_bits,
@@ -207,7 +270,8 @@
case MV64XXX_I2C_ACTION_INVALID:
default:
- printk(KERN_ERR "mv64xxx_i2c_do_action: Invalid action: %d\n",
+ dev_err(&drv_data->adapter.dev,
+ "mv64xxx_i2c_do_action: Invalid action: %d\n",
drv_data->action);
drv_data->rc = -EIO;
/* FALLTHRU */
@@ -220,7 +284,6 @@
break;
}
- pr_debug("mv64xxx_i2c_do_action: EXIT\n");
return;
}
@@ -252,7 +315,7 @@
*
*****************************************************************************
*/
-static inline void
+static void
mv64xxx_i2c_prepare_for_io(struct mv64xxx_i2c_data *drv_data,
struct i2c_msg *msg)
{
@@ -283,7 +346,7 @@
return;
}
-static inline void
+static void
mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data)
{
long flags, time_left;
@@ -312,7 +375,8 @@
if (!time_left <= 0) {
drv_data->state = MV64XXX_I2C_STATE_IDLE;
- printk(KERN_WARNING "mv64xxx: I2C bus locked\n");
+ dev_err(&drv_data->adapter.dev,
+ "mv64xxx: I2C bus locked\n");
}
}
else
@@ -321,7 +385,7 @@
return;
}
-static inline int
+static int
mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg)
{
long flags;
@@ -484,7 +548,7 @@
if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
MV64XXX_I2C_CTLR_NAME, drv_data)) {
- printk(KERN_ERR "mv64xxx: Can't register intr handler "
+ dev_err(dev, "mv64xxx: Can't register intr handler "
"irq: %d\\n", drv_data->irq);
mv64xxx_i2c_unmap_regs(drv_data);
@@ -492,8 +556,8 @@
return -EINVAL;
}
else if ((rc = i2c_add_adapter(&drv_data->adapter)) != 0) {
- printk(KERN_WARNING "mv64xxx: Can't add i2c adapter "
- "rc: %d\n", -rc);
+ dev_err(dev, "mv64xxx: Can't add i2c adapter, rc: %d\n",
+ -rc);
free_irq(drv_data->irq, drv_data);
mv64xxx_i2c_unmap_regs(drv_data);
kfree(drv_data);
diff -Nru a/drivers/i2c/busses/i2c-mv64xxx.h b/drivers/i2c/busses/i2c-mv64xxx.h
--- a/drivers/i2c/busses/i2c-mv64xxx.h 2005-01-26 16:52:56 -07:00
+++ /dev/null Wed Dec 31 16:00:00 196900
@@ -1,99 +0,0 @@
-/*
- * drivers/i2c/busses/i2c-mv64xxx.h
- *
- * Driver for the i2c controller on the Marvell line of host bridges for MIPS
- * and PPC (e.g, gt642[46]0, mv643[46]0, mv644[46]0).
- *
- * Author: Mark A. Greer <mgreer@xxxxxxxxxx>
- *
- * 2005 (c) MontaVista, Software, Inc. 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 I2C_MV64XXX_H
-#define I2C_MV64XXX_H
-
-/* Register defines */
-#define MV64XXX_I2C_REG_SLAVE_ADDR 0x00
-#define MV64XXX_I2C_REG_DATA 0x04
-#define MV64XXX_I2C_REG_CONTROL 0x08
-#define MV64XXX_I2C_REG_STATUS 0x0c
-#define MV64XXX_I2C_REG_BAUD 0x0c
-#define MV64XXX_I2C_REG_EXT_SLAVE_ADDR 0x10
-#define MV64XXX_I2C_REG_SOFT_RESET 0x1c
-
-#define MV64XXX_I2C_REG_CONTROL_ACK 0x00000004
-#define MV64XXX_I2C_REG_CONTROL_IFLG 0x00000008
-#define MV64XXX_I2C_REG_CONTROL_STOP 0x00000010
-#define MV64XXX_I2C_REG_CONTROL_START 0x00000020
-#define MV64XXX_I2C_REG_CONTROL_TWSIEN 0x00000040
-#define MV64XXX_I2C_REG_CONTROL_INTEN 0x00000080
-
-/* Ctlr status values */
-#define MV64XXX_I2C_STATUS_BUS_ERR 0x00
-#define MV64XXX_I2C_STATUS_MAST_START 0x08
-#define MV64XXX_I2C_STATUS_MAST_REPEAT_START 0x10
-#define MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK 0x18
-#define MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK 0x20
-#define MV64XXX_I2C_STATUS_MAST_WR_ACK 0x28
-#define MV64XXX_I2C_STATUS_MAST_WR_NO_ACK 0x30
-#define MV64XXX_I2C_STATUS_MAST_LOST_ARB 0x38
-#define MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK 0x40
-#define MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK 0x48
-#define MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK 0x50
-#define MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK 0x58
-#define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK 0xd0
-#define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_NO_ACK 0xd8
-#define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK 0xe0
-#define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_NO_ACK 0xe8
-#define MV64XXX_I2C_STATUS_NO_STATUS 0xf8
-
-/* Driver states */
-enum {
- MV64XXX_I2C_STATE_INVALID,
- MV64XXX_I2C_STATE_IDLE,
- MV64XXX_I2C_STATE_WAITING_FOR_START_COND,
- MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK,
- MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK,
- MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK,
- MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA,
- MV64XXX_I2C_STATE_ABORTING,
-};
-
-/* Driver actions */
-enum {
- MV64XXX_I2C_ACTION_INVALID,
- MV64XXX_I2C_ACTION_CONTINUE,
- MV64XXX_I2C_ACTION_SEND_START,
- MV64XXX_I2C_ACTION_SEND_ADDR_1,
- MV64XXX_I2C_ACTION_SEND_ADDR_2,
- MV64XXX_I2C_ACTION_SEND_DATA,
- MV64XXX_I2C_ACTION_RCV_DATA,
- MV64XXX_I2C_ACTION_RCV_DATA_STOP,
- MV64XXX_I2C_ACTION_SEND_STOP,
-};
-
-struct mv64xxx_i2c_data {
- int irq;
- uint state;
- uint action;
- u32 cntl_bits;
- void *reg_base;
- ulong reg_base_p;
- u32 addr1;
- u32 addr2;
- uint bytes_left;
- uint byte_posn;
- uint block;
- int rc;
- u32 freq_m;
- u32 freq_n;
- wait_queue_head_t waitq;
- spinlock_t lock;
- struct i2c_msg *msg;
- struct i2c_adapter adapter;
-};
-
-#endif /* I2C_MV64XXX_H */