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SubjectRe: [PATCH] mfd: let asic3 use mem resource instead of bus_shift
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Am Samstag, den 05.07.2008, 22:20 +0200 schrieb Philipp Zabel:
> The bus_shift parameter in platform_data is not needed
> as we can tell the driver with the IOMEM_RESOURCE whether
> the ASIC is located on a 16bit or 32bit memory bus.
>
> bus_shift as a configuration parameter is confusing at best
> because sometimes it means "shift register number left by n bits",
> sometimes it means "shift 32bit register address right by n bits"
> (see asic->bus_shift = 2 - pdata->bus_shift ...).
>
> The htc-egpio driver uses a more descriptive bus_width parameter,
> but for drivers where the register map size is fixed, we don't even
> need this. With this patch, the asic3 driver will calculate its
> bus_shift from the memory resource size (ASIC3_MAP_SIZE_16BIT or
> ASIC3_MAP_SIZE_32BIT).
>
> Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
> ---
> drivers/mfd/asic3.c | 11 +++++------
> include/linux/mfd/asic3.h | 3 ++-
> 2 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
> index f2fb233..3b870e7 100644
> --- a/drivers/mfd/asic3.c
> +++ b/drivers/mfd/asic3.c
> @@ -313,6 +313,7 @@ static int __init asic3_irq_probe(struct platform_device *pdev)
> struct asic3 *asic = platform_get_drvdata(pdev);
> unsigned long clksel = 0;
> unsigned int irq, irq_base;
> + int map_size;
>
> asic->irq_nr = platform_get_irq(pdev, 0);
> if (asic->irq_nr < 0)
> @@ -551,8 +552,8 @@ static int __init asic3_probe(struct platform_device *pdev)
> goto out_free;
> }
>
> -
> - asic->mapping = ioremap(mem->start, PAGE_SIZE);
> + map_size = mem->end - mem->start + 1;
> + asic->mapping = ioremap(mem->start, map_size);
> if (!asic->mapping) {
> ret = -ENOMEM;
> dev_err(asic->dev, "Couldn't ioremap\n");
> @@ -561,10 +562,8 @@ static int __init asic3_probe(struct platform_device *pdev)
>
> asic->irq_base = pdata->irq_base;
>
> - if (pdata && pdata->bus_shift)
> - asic->bus_shift = 2 - pdata->bus_shift;
> - else
> - asic->bus_shift = 0;
> + /* calculate bus shift from mem resource */
> + asic->bus_shift = 2 - (map_size >> 12);
>
> clksel = 0;
> asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
> diff --git a/include/linux/mfd/asic3.h b/include/linux/mfd/asic3.h
> index 8f8c46c..2de526a 100644
> --- a/include/linux/mfd/asic3.h
> +++ b/include/linux/mfd/asic3.h
> @@ -498,6 +498,7 @@ struct asic3_platform_data {
> #define ASIC3_SDIO_CTRL_LEDCtrl 0x7C
> #define ASIC3_SDIO_CTRL_SoftwareReset 0x1C0
>
> -#define ASIC3_MAP_SIZE 0x2000
> +#define ASIC3_MAP_SIZE_32BIT 0x2000
> +#define ASIC3_MAP_SIZE_16BIT 0x1000
>
> #endif /* __ASIC3_H__ */

Second try. I forgot to remove bus_shift struct asic3_platform_data
before.

regards
Philipp

---
Subject: [PATCH] mfd: let asic3 use mem resource instead of bus_shift

The bus_shift parameter in platform_data is not needed
as we can tell the driver with the IOMEM_RESOURCE whether
the ASIC is located on a 16bit or 32bit memory bus.

The htc-egpio driver uses a more descriptive bus_width parameter,
but for drivers where the register map size fixed, we don't even
need this.
bus_shift as a configuration parameter is confusing at best
because sometimes it means "shift register number left by n bits",
sometimes it means "shift 32bit register address right by n bits"
(see asic->bus_shift = 2 - pdata->bus_shift ...).

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
---
drivers/mfd/asic3.c | 11 +++++------
include/linux/mfd/asic3.h | 5 ++---
2 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
index f2fb233..3b870e7 100644
--- a/drivers/mfd/asic3.c
+++ b/drivers/mfd/asic3.c
@@ -313,6 +313,7 @@ static int __init asic3_irq_probe(struct platform_device *pdev)
struct asic3 *asic = platform_get_drvdata(pdev);
unsigned long clksel = 0;
unsigned int irq, irq_base;
+ int map_size;

asic->irq_nr = platform_get_irq(pdev, 0);
if (asic->irq_nr < 0)
@@ -551,8 +552,8 @@ static int __init asic3_probe(struct platform_device *pdev)
goto out_free;
}

-
- asic->mapping = ioremap(mem->start, PAGE_SIZE);
+ map_size = mem->end - mem->start + 1;
+ asic->mapping = ioremap(mem->start, map_size);
if (!asic->mapping) {
ret = -ENOMEM;
dev_err(asic->dev, "Couldn't ioremap\n");
@@ -561,10 +562,8 @@ static int __init asic3_probe(struct platform_device *pdev)

asic->irq_base = pdata->irq_base;

- if (pdata && pdata->bus_shift)
- asic->bus_shift = 2 - pdata->bus_shift;
- else
- asic->bus_shift = 0;
+ /* calculate bus shift from mem resource */
+ asic->bus_shift = 2 - (map_size >> 12);

clksel = 0;
asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
diff --git a/include/linux/mfd/asic3.h b/include/linux/mfd/asic3.h
index 8f8c46c..322cd6d 100644
--- a/include/linux/mfd/asic3.h
+++ b/include/linux/mfd/asic3.h
@@ -20,8 +20,6 @@ struct asic3_platform_data {
u16 *gpio_config;
unsigned int gpio_config_num;

- unsigned int bus_shift;
-
unsigned int irq_base;

unsigned int gpio_base;
@@ -498,6 +496,7 @@ struct asic3_platform_data {
#define ASIC3_SDIO_CTRL_LEDCtrl 0x7C
#define ASIC3_SDIO_CTRL_SoftwareReset 0x1C0

-#define ASIC3_MAP_SIZE 0x2000
+#define ASIC3_MAP_SIZE_32BIT 0x2000
+#define ASIC3_MAP_SIZE_16BIT 0x1000

#endif /* __ASIC3_H__ */
--
1.5.6

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