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Date: Tue, 09 Aug 2011 13:07:09 +1000
From: Ryan Mallon <rmallon@...il.com>
To: H Hartley Sweeten <hartleys@...ionengravers.com>
CC: Linux Kernel <linux-kernel@...r.kernel.org>,
"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>
Subject: Re: gpio: ep93xx: remove unused inline function
On 09/08/11 10:22, H Hartley Sweeten wrote:
> On Monday, August 08, 2011 4:54 PM, Ryan Mallon wrote:
>> Note that we have a lot of line>> 3 and (1<< (line& 7)) scattered
>> through this file. We could do something like this (completely untested):
>>
>> ----
>> gpio-ep93xx: Add helper functions for irq_port and irq_port_mask
>>
>> Signed-off-by: Ryan Mallon<rmallon@...il.com>
>> ---
>>
>> diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
>> index 72fb9c6..3092155 100644
>> --- a/drivers/gpio/gpio-ep93xx.c
>> +++ b/drivers/gpio/gpio-ep93xx.c
>> @@ -45,6 +45,16 @@ static const u8 eoi_register_offset[3] = { 0x98, 0xb4, 0x54 };
>> static const u8 int_en_register_offset[3] = { 0x9c, 0xb8, 0x58 };
>> static const u8 int_debounce_register_offset[3] = { 0xa8, 0xc4, 0x64 };
>>
>> +static inline int irq_port_mask(unsigned int irq)
>> +{
>> + return 1<< (irq_to_gpio(irq)& 7);
>> +}
>> +
>> +static inline int irq_port(unsigned int irq)
>> +{
>> + return irq_to_gpio(irq)>> 3;
>> +}
>> +
> Ryan,
>
> If you _do_ want to consolidate the port/mask stuff how about something like
> this instead? This at least gets the irq_to_gpio() call in one place.
>
Either approach should be fine. Since the helper functions are inline
the compiler should be smart enough to realise that it only needs to
call irq_to_gpio once. You don't really need to rename port_mask to mask
either, it just makes the patch more verbose than it needs to be.
If you want to put this through can you please add:
Signed-off-by: Ryan Mallon <rmallon@...il.com>
Thanks,
~Ryan
> Regards,
> Hartley
>
> ---
>
> gpio: ep93xx: Add helper function to convert irq to gpio, port, and mask.
>
> Signed-off-by: H Hartley Sweeten<hsweeten@...ionengravers.com>
>
> ---
>
> diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
> index 468b27d..59074f6 100644
> --- a/drivers/gpio/gpio-ep93xx.c
> +++ b/drivers/gpio/gpio-ep93xx.c
> @@ -46,6 +46,17 @@ static const u8 eoi_register_offset[3] = { 0x98, 0xb4, 0x54 };
> static const u8 int_en_register_offset[3] = { 0x9c, 0xb8, 0x58 };
> static const u8 int_debounce_register_offset[3] = { 0xa8, 0xc4, 0x64 };
>
> +static int ep93xx_gpio_irq_to_gpio_port_mask(unsigned int irq,
> + int *port, int *mask)
> +{
> + int gpio = irq_to_gpio(irq);
> +
> + *port = gpio>> 3;
> + *mask = 1<< (gpio& 7);
> +
> + return gpio;
> +}
> +
> static void ep93xx_gpio_update_int_params(unsigned port)
> {
> BUG_ON(port> 2);
> @@ -69,14 +80,14 @@ static inline void ep93xx_gpio_int_mask(unsigned line)
>
> static void ep93xx_gpio_int_debounce(unsigned int irq, bool enable)
> {
> - int line = irq_to_gpio(irq);
> - int port = line>> 3;
> - int port_mask = 1<< (line& 7);
> + int port, mask;
> +
> + ep93xx_gpio_irq_to_gpio_port_mask(irq,&port,&mask);
>
> if (enable)
> - gpio_int_debounce[port] |= port_mask;
> + gpio_int_debounce[port] |= mask;
> else
> - gpio_int_debounce[port]&= ~port_mask;
> + gpio_int_debounce[port]&= ~mask;
>
> __raw_writeb(gpio_int_debounce[port],
> EP93XX_GPIO_REG(int_debounce_register_offset[port]));
> @@ -119,48 +130,50 @@ static void ep93xx_gpio_f_irq_handler(unsigned int irq, struct irq_desc *desc)
>
> static void ep93xx_gpio_irq_ack(struct irq_data *d)
> {
> - int line = irq_to_gpio(d->irq);
> - int port = line>> 3;
> - int port_mask = 1<< (line& 7);
> + int port, mask;
> +
> + ep93xx_gpio_irq_to_gpio_port_mask(d->irq,&port,&mask);
>
> if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
> - gpio_int_type2[port] ^= port_mask; /* switch edge direction */
> + gpio_int_type2[port] ^= mask; /* switch edge direction */
> ep93xx_gpio_update_int_params(port);
> }
>
> - __raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
> + __raw_writeb(mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
> }
>
> static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
> {
> - int line = irq_to_gpio(d->irq);
> - int port = line>> 3;
> - int port_mask = 1<< (line& 7);
> + int port, mask;
> +
> + ep93xx_gpio_irq_to_gpio_port_mask(d->irq,&port,&mask);
>
> if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH)
> - gpio_int_type2[port] ^= port_mask; /* switch edge direction */
> + gpio_int_type2[port] ^= mask; /* switch edge direction */
>
> - gpio_int_unmasked[port]&= ~port_mask;
> + gpio_int_unmasked[port]&= ~mask;
> ep93xx_gpio_update_int_params(port);
>
> - __raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
> + __raw_writeb(mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
> }
>
> static void ep93xx_gpio_irq_mask(struct irq_data *d)
> {
> - int line = irq_to_gpio(d->irq);
> - int port = line>> 3;
> + int port, mask;
> +
> + ep93xx_gpio_irq_to_gpio_port_mask(d->irq,&port,&mask);
>
> - gpio_int_unmasked[port]&= ~(1<< (line& 7));
> + gpio_int_unmasked[port]&= ~mask;
> ep93xx_gpio_update_int_params(port);
> }
>
> static void ep93xx_gpio_irq_unmask(struct irq_data *d)
> {
> - int line = irq_to_gpio(d->irq);
> - int port = line>> 3;
> + int port, mask;
>
> - gpio_int_unmasked[port] |= 1<< (line& 7);
> + ep93xx_gpio_irq_to_gpio_port_mask(d->irq,&port,&mask);
> +
> + gpio_int_unmasked[port] |= mask;
> ep93xx_gpio_update_int_params(port);
> }
>
> @@ -171,41 +184,41 @@ static void ep93xx_gpio_irq_unmask(struct irq_data *d)
> */
> static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
> {
> - const int gpio = irq_to_gpio(d->irq);
> - const int port = gpio>> 3;
> - const int port_mask = 1<< (gpio& 7);
> + int gpio, port, mask;
> irq_flow_handler_t handler;
>
> + gpio = ep93xx_gpio_irq_to_gpio_port_mask(d->irq,&port,&mask);
> +
> gpio_direction_input(gpio);
>
> switch (type) {
> case IRQ_TYPE_EDGE_RISING:
> - gpio_int_type1[port] |= port_mask;
> - gpio_int_type2[port] |= port_mask;
> + gpio_int_type1[port] |= mask;
> + gpio_int_type2[port] |= mask;
> handler = handle_edge_irq;
> break;
> case IRQ_TYPE_EDGE_FALLING:
> - gpio_int_type1[port] |= port_mask;
> - gpio_int_type2[port]&= ~port_mask;
> + gpio_int_type1[port] |= mask;
> + gpio_int_type2[port]&= ~mask;
> handler = handle_edge_irq;
> break;
> case IRQ_TYPE_LEVEL_HIGH:
> - gpio_int_type1[port]&= ~port_mask;
> - gpio_int_type2[port] |= port_mask;
> + gpio_int_type1[port]&= ~mask;
> + gpio_int_type2[port] |= mask;
> handler = handle_level_irq;
> break;
> case IRQ_TYPE_LEVEL_LOW:
> - gpio_int_type1[port]&= ~port_mask;
> - gpio_int_type2[port]&= ~port_mask;
> + gpio_int_type1[port]&= ~mask;
> + gpio_int_type2[port]&= ~mask;
> handler = handle_level_irq;
> break;
> case IRQ_TYPE_EDGE_BOTH:
> - gpio_int_type1[port] |= port_mask;
> + gpio_int_type1[port] |= mask;
> /* set initial polarity based on current input level */
> if (gpio_get_value(gpio))
> - gpio_int_type2[port]&= ~port_mask; /* falling */
> + gpio_int_type2[port]&= ~mask; /* falling */
> else
> - gpio_int_type2[port] |= port_mask; /* rising */
> + gpio_int_type2[port] |= mask; /* rising */
> handler = handle_edge_irq;
> break;
> default:
> @@ -215,7 +228,7 @@ static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
>
> __irq_set_handler_locked(d->irq, handler);
>
> - gpio_int_enabled[port] |= port_mask;
> + gpio_int_enabled[port] |= mask;
>
> ep93xx_gpio_update_int_params(port);
>
--
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