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Date: Tue, 11 Sep 2012 13:34:54 +0200
From: Samuel Iglesias Gonsálvez
<siglesias@...lia.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
industrypack-devel@...ts.sourceforge.net,
Jens Taprogge <jens.taprogge@...rogge.org>,
Samuel Iglesias Gonsálvez
<siglesias@...lia.com>
Subject: [PATCH v2 01/20] Staging: ipack/bridges/tpci200: Put the TPCI200 control registers into a struct.
From: Jens Taprogge <jens.taprogge@...rogge.org>
This saves us from a little pointer arithmetic and cleans up the code a bit.
Signed-off-by: Jens Taprogge <jens.taprogge@...rogge.org>
Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@...lia.com>
---
drivers/staging/ipack/bridges/tpci200.c | 28 +++++++---------------------
drivers/staging/ipack/bridges/tpci200.h | 21 +++++++++++++--------
2 files changed, 20 insertions(+), 29 deletions(-)
diff --git a/drivers/staging/ipack/bridges/tpci200.c b/drivers/staging/ipack/bridges/tpci200.c
index 302fc21..c88166d 100644
--- a/drivers/staging/ipack/bridges/tpci200.c
+++ b/drivers/staging/ipack/bridges/tpci200.c
@@ -14,14 +14,6 @@
#include <linux/module.h>
#include "tpci200.h"
-/* TPCI200 controls registers */
-static const int control_reg[] = {
- TPCI200_CONTROL_A_REG,
- TPCI200_CONTROL_B_REG,
- TPCI200_CONTROL_C_REG,
- TPCI200_CONTROL_D_REG
-};
-
static int tpci200_slot_unregister(struct ipack_device *dev);
static struct tpci200_board *check_slot(struct ipack_device *dev)
@@ -85,8 +77,7 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
irqreturn_t ret = IRQ_NONE;
/* Read status register */
- status_reg = readw(tpci200->info->interface_regs +
- TPCI200_STATUS_REG);
+ status_reg = readw(&tpci200->info->interface_regs->status);
if (status_reg & TPCI200_SLOT_INT_MASK) {
unhandled_ints = status_reg & TPCI200_SLOT_INT_MASK;
@@ -107,7 +98,7 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
}
}
}
- /* Interrupt not handled are disabled */
+ /* Interrupts not handled are disabled */
if (unhandled_ints) {
for (i = 0; i < TPCI200_NB_SLOT; i++) {
if (unhandled_ints & ((TPCI200_INT0_EN | TPCI200_INT1_EN) << (2*i))) {
@@ -115,13 +106,11 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
"No registered ISR for slot [%d:%d]!. IRQ will be disabled.\n",
tpci200->number, i);
reg_value = readw(
- tpci200->info->interface_regs +
- control_reg[i]);
+ &tpci200->info->interface_regs->control[i]);
reg_value &=
~(TPCI200_INT0_EN | TPCI200_INT1_EN);
writew(reg_value,
- (tpci200->info->interface_regs +
- control_reg[i]));
+ &tpci200->info->interface_regs->control[i]);
}
}
}
@@ -219,8 +208,7 @@ static int tpci200_register(struct tpci200_board *tpci200)
(void __iomem *)mem_base + TPCI200_MEM8_GAP*i;
tpci200->slots[i].mem_phys.size = TPCI200_MEM8_SIZE;
- writew(slot_ctrl, (tpci200->info->interface_regs +
- control_reg[i]));
+ writew(slot_ctrl, &tpci200->info->interface_regs->control[i]);
}
res = request_irq(tpci200->info->pdev->irq,
@@ -259,8 +247,7 @@ static int __tpci200_request_irq(struct tpci200_board *tpci200,
* clock rate 8 MHz
*/
slot_ctrl = TPCI200_INT0_EN | TPCI200_INT1_EN;
- writew(slot_ctrl, (tpci200->info->interface_regs +
- control_reg[dev->slot]));
+ writew(slot_ctrl, &tpci200->info->interface_regs->control[dev->slot]);
return 0;
}
@@ -279,8 +266,7 @@ static void __tpci200_free_irq(struct tpci200_board *tpci200,
* clock rate 8 MHz
*/
slot_ctrl = 0;
- writew(slot_ctrl, (tpci200->info->interface_regs +
- control_reg[dev->slot]));
+ writew(slot_ctrl, &tpci200->info->interface_regs->control[dev->slot]);
}
static int tpci200_free_irq(struct ipack_device *dev)
diff --git a/drivers/staging/ipack/bridges/tpci200.h b/drivers/staging/ipack/bridges/tpci200.h
index 38acba1..867d696 100644
--- a/drivers/staging/ipack/bridges/tpci200.h
+++ b/drivers/staging/ipack/bridges/tpci200.h
@@ -37,13 +37,15 @@
#define TPCI200_MEM16_SPACE_BAR 4
#define TPCI200_MEM8_SPACE_BAR 5
-#define TPCI200_REVISION_REG 0x00
-#define TPCI200_CONTROL_A_REG 0x02
-#define TPCI200_CONTROL_B_REG 0x04
-#define TPCI200_CONTROL_C_REG 0x06
-#define TPCI200_CONTROL_D_REG 0x08
-#define TPCI200_RESET_REG 0x0A
-#define TPCI200_STATUS_REG 0x0C
+struct tpci200_regs {
+ u16 revision;
+ /* writes to control should occur with the mutex held to protect
+ * read-modify-write operations */
+ u16 control[4];
+ u16 reset;
+ u16 status;
+ u8 reserved[242];
+} __packed;
#define TPCI200_IFACE_SIZE 0x100
@@ -63,6 +65,7 @@
#define TPCI200_MEM16_GAP 0x00800000
#define TPCI200_MEM16_SIZE 0x00800000
+/* control field in tpci200_regs */
#define TPCI200_INT0_EN 0x0040
#define TPCI200_INT1_EN 0x0080
#define TPCI200_INT0_EDGE 0x0010
@@ -72,11 +75,13 @@
#define TPCI200_RECOVER_EN 0x0002
#define TPCI200_CLK32 0x0001
+/* reset field in tpci200_regs */
#define TPCI200_A_RESET 0x0001
#define TPCI200_B_RESET 0x0002
#define TPCI200_C_RESET 0x0004
#define TPCI200_D_RESET 0x0008
+/* status field in tpci200_regs */
#define TPCI200_A_TIMEOUT 0x1000
#define TPCI200_B_TIMEOUT 0x2000
#define TPCI200_C_TIMEOUT 0x4000
@@ -149,7 +154,7 @@ struct tpci200_slot {
struct tpci200_infos {
struct pci_dev *pdev;
struct pci_device_id *id_table;
- void __iomem *interface_regs;
+ struct tpci200_regs __iomem *interface_regs;
void __iomem *ioidint_space;
void __iomem *mem8_space;
void __iomem *cfg_regs;
--
1.7.10.4
--
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