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Staging: ipack/bridges/tpci200: add helpers for writing control regs. 

Convert tpci200_set_clockrate and tpci200_interrupt.

Signed-off-by: Jens Taprogge <jens.taprogge@taprogge.org>
Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Taprogge 2012-09-12 14:55:23 +02:00 committed by Greg Kroah-Hartman
parent 0d66002556
commit 0118681b2b
1 changed files with 32 additions and 17 deletions
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49
drivers/staging/ipack/bridges/tpci200.c
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@ -53,6 +53,32 @@ static struct tpci200_board *check_slot(struct ipack_device *dev)
return tpci200;
}
static void __tpci200_clear_mask(__le16 __iomem *addr, u16 mask)
{
iowrite16(ioread16(addr) & (~mask), addr);
}
static void tpci200_clear_mask(struct tpci200_board *tpci200,
__le16 __iomem *addr, u16 mask)
{
mutex_lock(&tpci200->mutex);
__tpci200_clear_mask(addr, mask);
mutex_unlock(&tpci200->mutex);
}
static void __tpci200_set_mask(__le16 __iomem *addr, u16 mask)
{
iowrite16(ioread16(addr) | mask, addr);
}
static void tpci200_set_mask(struct tpci200_board *tpci200,
__le16 __iomem *addr, u16 mask)
{
mutex_lock(&tpci200->mutex);
__tpci200_set_mask(addr, mask);
mutex_unlock(&tpci200->mutex);
}
static void tpci200_unregister(struct tpci200_board *tpci200)
{
int i;
@ -86,7 +112,7 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
{
struct tpci200_board *tpci200 = (struct tpci200_board *) dev_id;
int i;
unsigned short status_reg, reg_value;
unsigned short status_reg;
unsigned short unhandled_ints = 0;
irqreturn_t ret = IRQ_NONE;
struct slot_irq *slot_irq;
@ -124,12 +150,9 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
dev_info(&slot_irq->holder->dev,
"No registered ISR for slot [%d:%d]!. IRQ will be disabled.\n",
tpci200->number, i);
reg_value = readw(
&tpci200->info->interface_regs->control[i]);
reg_value &=
~(TPCI200_INT0_EN | TPCI200_INT1_EN);
writew(reg_value,
&tpci200->info->interface_regs->control[i]);
__tpci200_clear_mask(
&tpci200->info->interface_regs->control[i],
TPCI200_INT0_EN | TPCI200_INT1_EN);
}
}
}
@ -518,30 +541,22 @@ static int tpci200_set_clockrate(struct ipack_device *dev, int mherz)
{
struct tpci200_board *tpci200 = check_slot(dev);
u16 __iomem *addr;
u16 reg;
if (!tpci200)
return -ENODEV;
addr = &tpci200->info->interface_regs->control[dev->slot];
/* Ensure the control register is not changed by another task after we
* have read it. */
mutex_lock(&tpci200->mutex);
reg = ioread16(addr);
switch (mherz) {
case 8:
reg &= ~(TPCI200_CLK32);
tpci200_clear_mask(tpci200, addr, TPCI200_CLK32);
break;
case 32:
reg |= TPCI200_CLK32;
tpci200_set_mask(tpci200, addr, TPCI200_CLK32);
break;
default:
mutex_unlock(&tpci200->mutex);
return -EINVAL;
}
iowrite16(reg, addr);
mutex_unlock(&tpci200->mutex);
return 0;
}