From: Sascha Hauer <s.hauer@pengutronix.de>
To: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 1/5] device: introduce resource structure to simplify resource delaration
Date: Tue, 23 Nov 2010 12:34:34 +0100 [thread overview]
Message-ID: <20101123113434.GH6017@pengutronix.de> (raw)
In-Reply-To: <20101123082528.GE11909@game.jcrosoft.org>
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@jcrosoft.com>
> > > > > > >
> > > > > > >
> > > > > > > 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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next prev parent reply other threads:[~2010-11-23 11:34 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-12 18:02 [To test] [PATCH 0/5] device: introduce resource structure Jean-Christophe PLAGNIOL-VILLARD
2010-11-12 18:18 ` [PATCH 1/5] device: introduce resource structure to simplify resource delaration Jean-Christophe PLAGNIOL-VILLARD
2010-11-19 8:00 ` Sascha Hauer
2010-11-19 11:30 ` Jean-Christophe PLAGNIOL-VILLARD
2010-11-20 13:40 ` Sascha Hauer
2010-11-20 13:58 ` Jean-Christophe PLAGNIOL-VILLARD
2010-11-21 4:28 ` Jean-Christophe PLAGNIOL-VILLARD
2010-11-21 6:46 ` Jean-Christophe PLAGNIOL-VILLARD
2010-11-23 7:36 ` Sascha Hauer
2010-11-23 8:25 ` Jean-Christophe PLAGNIOL-VILLARD
2010-11-23 11:34 ` Sascha Hauer [this message]
2011-01-27 8:20 ` Sascha Hauer
2010-11-12 18:18 ` [PATCH 2/5] mem: add multiple resource support Jean-Christophe PLAGNIOL-VILLARD
2010-11-12 18:18 ` [PATCH 3/5] arm/setup_memory_tags: " Jean-Christophe PLAGNIOL-VILLARD
2010-11-12 18:18 ` [PATCH 4/5] edb93xx: convert to multiple mem resources Jean-Christophe PLAGNIOL-VILLARD
2010-11-12 18:18 ` [PATCH 5/5] pcm037: " Jean-Christophe PLAGNIOL-VILLARD
2010-11-17 13:59 ` [PATCH 1/2] mem: multiple resource support allow exclude a resource Jean-Christophe PLAGNIOL-VILLARD
2010-11-19 8:24 ` Sascha Hauer
2010-11-19 11:31 ` Jean-Christophe PLAGNIOL-VILLARD
2010-11-17 13:59 ` [PATCH 2/2] mem: convert to DEVFS_MEM_BAREBOX_ONLY for freescale-mx25-3-stack/pcm037/pvm038 Jean-Christophe PLAGNIOL-VILLARD
2010-11-17 14:09 ` Baruch Siach
2010-11-17 14:02 ` [To test] [PATCH 0/5] device: introduce resource structure Jean-Christophe PLAGNIOL-VILLARD
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