On Tue, Nov 23, 2010 at 09:25:28AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 08:36 Tue 23 Nov , Sascha Hauer wrote:
> > On Sun, Nov 21, 2010 at 05:28:54AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > On 14:58 Sat 20 Nov , Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > > On 14:40 Sat 20 Nov , Sascha Hauer wrote:
> > > > > On Fri, Nov 19, 2010 at 12:30:09PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > > > > On 09:00 Fri 19 Nov , Sascha Hauer wrote:
> > > > > > > Hi J,
> > > > > > >
> > > > > > > On Fri, Nov 12, 2010 at 07:18:54PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > > > > > > introdude also some helper to manager them
> > > > > > > >
> > > > > > > > and add multi resource per device support
> > > > > > > >
> > > > > > > > ram device: use resource structure instead of memory_platform_data
> > > > > > > >
> > > > > > > > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
> > > > > > >
> > > > > > >
> > > > > > > You shouldn't use a resource_size_t type to access registers. This will
> > > > > > > lead to problems when we start to support 64bit resource sizes
> > > > > > no as resource_size_t is 64 bit aware
> > > > >
> > > > > And exactly this is the problem. void * is usually only 32bit on arm.
> > > > > This will lead to compiler warnings and sparse isn't happy about
> > > > > unsigned long in readl/writel anyway.
> > > > IIRC on arm resource_size_t is never 64bit at least on the current ARMvx
> >
> > Think of MMC/SD cards > 4G.
> ok but I do not see the import on the ressource for the drivers?
Look at this excerpt from your patch:
@@ -675,10 +686,11 @@ static int mci_request(struct mci_host *mci_pdata,
struct mci_cmd *cmd,
{
struct device_d *hw_dev = mci_pdata->hw_dev;
int rc;
+ resource_size_t map_base = dev_resource_get_start(hw_dev);
/* enable clock */
- writel(readl(hw_dev->map_base + SDICON) | SDICON_CLKEN,
- hw_dev->map_base + SDICON);
+ writel(readl(map_base + SDICON) | SDICON_CLKEN,
+ map_base + SDICON);
if ((cmd->resp_type == 0) || (data == NULL))
rc = s3c_mci_std_cmds(hw_dev, cmd);
You pass map_base which is of type resource_size_t to writel. Sparse
will barf when the address is not a void __iomem *. Also,
resource_size_t may be 64bit which is then implicitely casted to void *.
This is why it should look like this:
@@ -675,10 +686,11 @@ static int mci_request(struct mci_host *mci_pdata,
struct mci_cmd *cmd,
{
struct device_d *hw_dev = mci_pdata->hw_dev;
int rc;
+ void __iomem *map_base = TO_IOMEM(dev_resource_get_start(hw_dev));
/* enable clock */
- writel(readl(hw_dev->map_base + SDICON) | SDICON_CLKEN,
- hw_dev->map_base + SDICON);
+ writel(readl(map_base + SDICON) | SDICON_CLKEN,
+ map_base + SDICON);
if ((cmd->resp_type == 0) || (data == NULL))
rc = s3c_mci_std_cmds(hw_dev, cmd);
Sascha
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