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SubjectRE: [PATCH v2] Staging: dt3155: Cleanup memory mapped i/o access
On Tuesday, June 22, 2010 3:39 PM, Greg KH wrote:
> You are still doing something odd, this one doesn't apply either. Is
> your email client messing something up?
>
> strange.

Hmm. I thought I had that worked out since I haven't had any problems lately.

Can you please try this one?

---
The macros ReadMReg and WriteMReg are really just private versions of
the kernel's readl and writel functions. Use the kernel's functions
instead. And since ioremap returns a (void __iomem *) not a (u8 *),
change all the uses of dt3155_lbase to reflect this.

While here, make dt3155_lbase static since it is only used in the
dt3155_drv.c file. Also, remove the global variable dt3155_bbase
since it is not used anywhere in the code.

Where is makes sense, create a local 'mmio' variable instead of using
dt3155_lbase[minor] to make the code more readable.

This change also affects the {Read|Write}I2C functions so they are
also modified as needed.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Scott Smedley <ss@aao.gov.au>

---
V2 - rebased to next-20100621

diff --git a/drivers/staging/dt3155/dt3155_drv.c b/drivers/staging/dt3155/dt3155_drv.c
index dcd3849..88c9e59 100644
--- a/drivers/staging/dt3155/dt3155_drv.c
+++ b/drivers/staging/dt3155/dt3155_drv.c
@@ -64,8 +64,8 @@ extern void printques(int);
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
+#include <linux/io.h>

-#include <asm/io.h>
#include <asm/uaccess.h>

#include "dt3155.h"
@@ -112,14 +112,12 @@ int dt3155_major = 0;
struct dt3155_status dt3155_status[MAXBOARDS];

/* kernel logical address of the board */
-u8 *dt3155_lbase[MAXBOARDS] = { NULL
+static void __iomem *dt3155_lbase[MAXBOARDS] = { NULL
#if MAXBOARDS == 2
, NULL
#endif
};
-/* DT3155 registers */
-u8 *dt3155_bbase = NULL; /* kernel logical address of the *
- * buffer region */
+
u32 dt3155_dev_open[MAXBOARDS] = {0
#if MAXBOARDS == 2
, 0
@@ -139,11 +137,11 @@ static void quick_stop (int minor)
{
// TODO: scott was here
#if 1
- ReadMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
+ int_csr_r.reg = readl(dt3155_lbase[minor] + INT_CSR);
/* disable interrupts */
int_csr_r.fld.FLD_END_EVE_EN = 0;
int_csr_r.fld.FLD_END_ODD_EN = 0;
- WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
+ writel(int_csr_r.reg, dt3155_lbase[minor] + INT_CSR);

dt3155_status[minor].state &= ~(DT3155_STATE_STOP|0xff);
/* mark the system stopped: */
@@ -171,6 +169,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
int index;
unsigned long flags;
u32 buffer_addr;
+ void __iomem *mmio;

/* find out who issued the interrupt */
for (index = 0; index < ndevices; index++) {
@@ -187,8 +186,10 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
return;
}

+ mmio = dt3155_lbase[minor];
+
/* Check for corruption and set a flag if so */
- ReadMReg((dt3155_lbase[minor] + CSR1), csr1_r.reg);
+ csr1_r.reg = readl(mmio + CSR1);

if ((csr1_r.fld.FLD_CRPT_EVE) || (csr1_r.fld.FLD_CRPT_ODD))
{
@@ -200,7 +201,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
return;
}

- ReadMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
+ int_csr_r.reg = readl(mmio + INT_CSR);

/* Handle the even field ... */
if (int_csr_r.fld.FLD_END_EVE)
@@ -211,7 +212,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
dt3155_fbuffer[minor]->frame_count++;
}

- ReadI2C(dt3155_lbase[minor], EVEN_CSR, &i2c_even_csr.reg);
+ ReadI2C(mmio, EVEN_CSR, &i2c_even_csr.reg);

/* Clear the interrupt? */
int_csr_r.fld.FLD_END_EVE = 1;
@@ -231,7 +232,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
}
}

- WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
+ writel(int_csr_r.reg, mmio + INT_CSR);

/* Set up next DMA if we are doing FIELDS */
if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
@@ -249,7 +250,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)

/* Set up the DMA address for the next field */
local_irq_restore(flags);
- WriteMReg((dt3155_lbase[minor] + ODD_DMA_START), buffer_addr);
+ writel(buffer_addr, mmio + ODD_DMA_START);
}

/* Check for errors. */
@@ -257,7 +258,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
if (i2c_even_csr.fld.ERROR_EVE)
dt3155_errno = DT_ERR_OVERRUN;

- WriteI2C(dt3155_lbase[minor], EVEN_CSR, i2c_even_csr.reg);
+ WriteI2C(mmio, EVEN_CSR, i2c_even_csr.reg);

/* Note that we actually saw an even field meaning */
/* that subsequent odd field complete the frame */
@@ -274,7 +275,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* ... now handle the odd field */
if (int_csr_r.fld.FLD_END_ODD)
{
- ReadI2C(dt3155_lbase[minor], ODD_CSR, &i2c_odd_csr.reg);
+ ReadI2C(mmio, ODD_CSR, &i2c_odd_csr.reg);

/* Clear the interrupt? */
int_csr_r.fld.FLD_END_ODD = 1;
@@ -310,7 +311,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
}
}

- WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
+ writel(int_csr_r.reg, mmio + INT_CSR);

/* if the odd field has been acquired, then */
/* change the next dma location for both fields */
@@ -387,14 +388,14 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
{
- WriteMReg((dt3155_lbase[minor] + EVEN_DMA_START), buffer_addr);
+ writel(buffer_addr, mmio + EVEN_DMA_START);
}
else
{
- WriteMReg((dt3155_lbase[minor] + EVEN_DMA_START), buffer_addr);
+ writel(buffer_addr, mmio + EVEN_DMA_START);

- WriteMReg((dt3155_lbase[minor] + ODD_DMA_START), buffer_addr
- + dt3155_status[minor].config.cols);
+ writel(buffer_addr + dt3155_status[minor].config.cols,
+ mmio + ODD_DMA_START);
}

/* Do error checking */
@@ -402,7 +403,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
if (i2c_odd_csr.fld.ERROR_ODD)
dt3155_errno = DT_ERR_OVERRUN;

- WriteI2C(dt3155_lbase[minor], ODD_CSR, i2c_odd_csr.reg);
+ WriteI2C(mmio, ODD_CSR, i2c_odd_csr.reg);

return;
}
@@ -419,6 +420,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
static void dt3155_init_isr(int minor)
{
const u32 stride = dt3155_status[minor].config.cols;
+ void __iomem *mmio = dt3155_lbase[minor];

switch (dt3155_status[minor].state & DT3155_STATE_MODE)
{
@@ -429,12 +431,9 @@ static void dt3155_init_isr(int minor)
even_dma_stride_r = 0;
odd_dma_stride_r = 0;

- WriteMReg((dt3155_lbase[minor] + EVEN_DMA_START),
- even_dma_start_r);
- WriteMReg((dt3155_lbase[minor] + EVEN_DMA_STRIDE),
- even_dma_stride_r);
- WriteMReg((dt3155_lbase[minor] + ODD_DMA_STRIDE),
- odd_dma_stride_r);
+ writel(even_dma_start_r, mmio + EVEN_DMA_START);
+ writel(even_dma_stride_r, mmio + EVEN_DMA_STRIDE);
+ writel(odd_dma_stride_r, mmio + ODD_DMA_STRIDE);
break;
}

@@ -447,14 +446,10 @@ static void dt3155_init_isr(int minor)
even_dma_stride_r = stride;
odd_dma_stride_r = stride;

- WriteMReg((dt3155_lbase[minor] + EVEN_DMA_START),
- even_dma_start_r);
- WriteMReg((dt3155_lbase[minor] + ODD_DMA_START),
- odd_dma_start_r);
- WriteMReg((dt3155_lbase[minor] + EVEN_DMA_STRIDE),
- even_dma_stride_r);
- WriteMReg((dt3155_lbase[minor] + ODD_DMA_STRIDE),
- odd_dma_stride_r);
+ writel(even_dma_start_r, mmio + EVEN_DMA_START);
+ writel(odd_dma_start_r, mmio + ODD_DMA_START);
+ writel(even_dma_stride_r, mmio + EVEN_DMA_STRIDE);
+ writel(odd_dma_stride_r, mmio + ODD_DMA_STRIDE);
break;
}
}
@@ -462,9 +457,9 @@ static void dt3155_init_isr(int minor)
/* 50/60 Hz should be set before this point but let's make sure it is */
/* right anyway */

- ReadI2C(dt3155_lbase[minor], CSR2, &i2c_csr2.reg);
+ ReadI2C(mmio, CSR2, &i2c_csr2.reg);
i2c_csr2.fld.HZ50 = FORMAT50HZ;
- WriteI2C(dt3155_lbase[minor], CSR2, i2c_csr2.reg);
+ WriteI2C(mmio, CSR2, i2c_csr2.reg);

/* enable busmaster chip, clear flags */

@@ -484,7 +479,7 @@ static void dt3155_init_isr(int minor)
csr1_r.fld.FLD_CRPT_EVE = 1; /* writing a 1 clears flags */
csr1_r.fld.FLD_CRPT_ODD = 1;

- WriteMReg((dt3155_lbase[minor] + CSR1),csr1_r.reg);
+ writel(csr1_r.reg, mmio + CSR1);

/* Enable interrupts at the end of each field */

@@ -493,14 +488,14 @@ static void dt3155_init_isr(int minor)
int_csr_r.fld.FLD_END_ODD_EN = 1;
int_csr_r.fld.FLD_START_EN = 0;

- WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
+ writel(int_csr_r.reg, mmio + INT_CSR);

/* start internal BUSY bits */

- ReadI2C(dt3155_lbase[minor], CSR2, &i2c_csr2.reg);
+ ReadI2C(mmio, CSR2, &i2c_csr2.reg);
i2c_csr2.fld.BUSY_ODD = 1;
i2c_csr2.fld.BUSY_EVE = 1;
- WriteI2C(dt3155_lbase[minor], CSR2, i2c_csr2.reg);
+ WriteI2C(mmio, CSR2, i2c_csr2.reg);

/* Now its up to the interrupt routine!! */

@@ -709,7 +704,7 @@ static int dt3155_open(struct inode* inode, struct file* filep)

/* Disable ALL interrupts */
int_csr_r.reg = 0;
- WriteMReg((dt3155_lbase[minor] + INT_CSR), int_csr_r.reg);
+ writel(int_csr_r.reg, dt3155_lbase[minor] + INT_CSR);

init_waitqueue_head(&(dt3155_read_wait_queue[minor]));

@@ -911,7 +906,7 @@ static int find_PCI (void)

/* Remap the base address to a logical address through which we
* can access it. */
- dt3155_lbase[pci_index - 1] = ioremap(base,PCI_PAGE_SIZE);
+ dt3155_lbase[pci_index - 1] = ioremap(base, PCI_PAGE_SIZE);
dt3155_status[pci_index - 1].reg_addr = base;
DT_3155_DEBUG_MSG("DT3155: New logical address is %p \n",
dt3155_lbase[pci_index-1]);
@@ -1036,7 +1031,7 @@ int init_module(void)
int_csr_r.reg = 0;
for( index = 0; index < ndevices; index++)
{
- WriteMReg((dt3155_lbase[index] + INT_CSR), int_csr_r.reg);
+ writel(int_csr_r.reg, dt3155_lbase[index] + INT_CSR);
if(dt3155_status[index].device_installed)
{
/*
diff --git a/drivers/staging/dt3155/dt3155_drv.h b/drivers/staging/dt3155/dt3155_drv.h
index 95e68c3..c447c61 100644
--- a/drivers/staging/dt3155/dt3155_drv.h
+++ b/drivers/staging/dt3155/dt3155_drv.h
@@ -24,12 +24,6 @@ MA 02111-1307 USA
#ifndef DT3155_DRV_INC
#define DT3155_DRV_INC

-/* kernel logical address of the frame grabbers */
-extern u8 *dt3155_lbase[MAXBOARDS];
-
-/* kernel logical address of ram buffer */
-extern u8 *dt3155_bbase;
-
#ifdef __KERNEL__
#include <linux/wait.h>

diff --git a/drivers/staging/dt3155/dt3155_io.c b/drivers/staging/dt3155/dt3155_io.c
index 7792e71..485cc5e 100644
--- a/drivers/staging/dt3155/dt3155_io.c
+++ b/drivers/staging/dt3155/dt3155_io.c
@@ -21,6 +21,8 @@
*/

#include <linux/delay.h>
+#include <linux/io.h>
+
#include "dt3155.h"
#include "dt3155_io.h"
#include "dt3155_drv.h"
@@ -75,13 +77,13 @@ u8 i2c_pm_lut_data;
*
* This function handles read/write timing and r/w timeout error
*/
-static int wait_ibsyclr(u8 *lpReg)
+static int wait_ibsyclr(void __iomem *mmio)
{
/* wait 100 microseconds */
udelay(100L);
/* __delay(loops_per_sec/10000); */

- ReadMReg(lpReg + IIC_CSR2, iic_csr2_r.reg);
+ iic_csr2_r.reg = readl(mmio + IIC_CSR2);
if (iic_csr2_r.fld.NEW_CYCLE) {
/* if NEW_CYCLE didn't clear */
/* TIMEOUT ERROR */
@@ -101,11 +103,11 @@ static int wait_ibsyclr(u8 *lpReg)
* 2nd parameter is reg. index;
* 3rd is value to be written
*/
-int WriteI2C(u8 *lpReg, u_short wIregIndex, u8 byVal)
+int WriteI2C(void __iomem *mmio, u_short wIregIndex, u8 byVal)
{
/* read 32 bit IIC_CSR2 register data into union */

- ReadMReg((lpReg + IIC_CSR2), iic_csr2_r.reg);
+ iic_csr2_r.reg = readl(mmio + IIC_CSR2);

/* for write operation */
iic_csr2_r.fld.DIR_RD = 0;
@@ -117,10 +119,10 @@ int WriteI2C(u8 *lpReg, u_short wIregIndex, u8 byVal)
iic_csr2_r.fld.NEW_CYCLE = 1;

/* xfer union data into 32 bit IIC_CSR2 register */
- WriteMReg((lpReg + IIC_CSR2), iic_csr2_r.reg);
+ writel(iic_csr2_r.reg, mmio + IIC_CSR2);

/* wait for IIC cycle to finish */
- return wait_ibsyclr(lpReg);
+ return wait_ibsyclr(mmio);
}

/*
@@ -132,12 +134,12 @@ int WriteI2C(u8 *lpReg, u_short wIregIndex, u8 byVal)
* 2nd parameter is reg. index;
* 3rd is adrs of value to be read
*/
-int ReadI2C(u8 *lpReg, u_short wIregIndex, u8 *byVal)
+int ReadI2C(void __iomem *mmio, u_short wIregIndex, u8 *byVal)
{
int writestat; /* status for return */

/* read 32 bit IIC_CSR2 register data into union */
- ReadMReg((lpReg + IIC_CSR2), iic_csr2_r.reg);
+ iic_csr2_r.reg = readl(mmio + IIC_CSR2);

/* for read operation */
iic_csr2_r.fld.DIR_RD = 1;
@@ -149,14 +151,14 @@ int ReadI2C(u8 *lpReg, u_short wIregIndex, u8 *byVal)
iic_csr2_r.fld.NEW_CYCLE = 1;

/* xfer union's data into 32 bit IIC_CSR2 register */
- WriteMReg((lpReg + IIC_CSR2), iic_csr2_r.reg);
+ writel(iic_csr2_r.reg, mmio + IIC_CSR2);

/* wait for IIC cycle to finish */
- writestat = wait_ibsyclr(lpReg);
+ writestat = wait_ibsyclr(mmio);

/* Next 2 commands read 32 bit IIC_CSR1 register's data into union */
/* first read data is in IIC_CSR1 */
- ReadMReg((lpReg + IIC_CSR1), iic_csr1_r.reg);
+ iic_csr1_r.reg = readl(mmio + IIC_CSR1);

/* now get data u8 out of register */
*byVal = (u8) iic_csr1_r.fld.RD_DATA;
diff --git a/drivers/staging/dt3155/dt3155_io.h b/drivers/staging/dt3155/dt3155_io.h
index d1a2510..a9aa754 100644
--- a/drivers/staging/dt3155/dt3155_io.h
+++ b/drivers/staging/dt3155/dt3155_io.h
@@ -34,11 +34,6 @@ MA 02111-1307 USA
#ifndef DT3155_IO_INC
#define DT3155_IO_INC

-/* macros to access registers */
-
-#define WriteMReg(Address, Data) (*((u32 *)(Address)) = Data)
-#define ReadMReg(Address, Data) (Data = *((u32 *)(Address)))
-
/***************** 32 bit register globals **************/

/* offsets for 32-bit memory mapped registers */
@@ -352,7 +347,7 @@ extern u8 i2c_pm_lut_data;

/* access 8-bit IIC registers */

-extern int ReadI2C(u8 *lpReg, u_short wIregIndex, u8 *byVal);
-extern int WriteI2C(u8 *lpReg, u_short wIregIndex, u8 byVal);
+extern int ReadI2C(void __iomem *mmio, u_short wIregIndex, u8 *byVal);
+extern int WriteI2C(void __iomem *mmio, u_short wIregIndex, u8 byVal);

#endif

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