Ramos Falcon, Ernesto had written, on 07/28/2010 09:40 AM, the following:
Remove unnecessary volatile variables; use accessor
functions __raw_readl/__raw_writel instead when applicable.
Signed-off-by: Ernesto Ramos <ernesto@xxxxxx>
---
drivers/staging/tidspbridge/core/tiomap3430.c | 8 ++++----
drivers/staging/tidspbridge/dynload/tramp.c | 4 ++--
drivers/staging/tidspbridge/pmgr/cmm.c | 7 ++++---
3 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/staging/tidspbridge/core/tiomap3430.c b/drivers/staging/tidspbridge/core/tiomap3430.c
index 08a2f5f..ae1f394 100644
--- a/drivers/staging/tidspbridge/core/tiomap3430.c
+++ b/drivers/staging/tidspbridge/core/tiomap3430.c
@@ -404,7 +404,7 @@ static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
pr_err("%s: Illegal SM base\n", __func__);
status = -EPERM;
} else
- *((volatile u32 *)dw_sync_addr) = 0xffffffff;
+ __raw_writel(0xffffffff, dw_sync_addr);
curious question: any reason not to use writel instead of __raw_writel?
if (DSP_SUCCEEDED(status)) {
resources = dev_context->resources;
@@ -584,7 +584,7 @@ static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
dev_dbg(bridge, "Waiting for Sync @ 0x%x\n", dw_sync_addr);
dev_dbg(bridge, "DSP c_int00 Address = 0x%x\n", dsp_addr);
if (dsp_debug)
- while (*((volatile u16 *)dw_sync_addr))
+ while (__raw_readw(dw_sync_addr))
;;
may be for a later on patch -> we seem to have a potential infinite loop
here..
/* Wait for DSP to clear word in shared memory */
@@ -602,7 +602,7 @@ static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
/* Write the synchronization bit to indicate the
* completion of OPP table update to DSP
*/
- *((volatile u32 *)dw_sync_addr) = 0XCAFECAFE;
+ __raw_writel(0XCAFECAFE, dw_sync_addr);
/* update board state */
dev_context->dw_brd_state = BRD_RUNNING;
@@ -1852,7 +1852,7 @@ bool wait_for_start(struct bridge_dev_context *dev_context, u32 dw_sync_addr)
u16 timeout = TIHELEN_ACKTIMEOUT;
/* Wait for response from board */
- while (*((volatile u16 *)dw_sync_addr) && --timeout)
+ while (__raw_readw(dw_sync_addr) && --timeout)
udelay(10);
/* If timed out: return false */
diff --git a/drivers/staging/tidspbridge/dynload/tramp.c b/drivers/staging/tidspbridge/dynload/tramp.c
index 81314d2..60d22ea 100644
--- a/drivers/staging/tidspbridge/dynload/tramp.c
+++ b/drivers/staging/tidspbridge/dynload/tramp.c
@@ -86,8 +86,8 @@ static u8 priv_h2a(u8 value)
static void priv_tramp_sym_gen_name(u32 value, char *dst)
{
u32 i;
- volatile char *prefix = TRAMP_SYM_PREFIX;
- volatile char *dst_local = dst;
+ char *prefix = TRAMP_SYM_PREFIX;
+ char *dst_local = dst;
u8 tmp;
/* Clear out the destination, including the ending NULL */
diff --git a/drivers/staging/tidspbridge/pmgr/cmm.c b/drivers/staging/tidspbridge/pmgr/cmm.c
index 874ed64..b7cba1b 100644
--- a/drivers/staging/tidspbridge/pmgr/cmm.c
+++ b/drivers/staging/tidspbridge/pmgr/cmm.c
@@ -1008,6 +1008,7 @@ void *cmm_xlator_alloc_buf(struct cmm_xlatorobject *xlator, void *va_buf,
{
struct cmm_xlator *xlator_obj = (struct cmm_xlator *)xlator;
void *pbuf = NULL;
+ void *tmp_va_buff;
struct cmm_attrs attrs;
DBC_REQUIRE(refs > 0);
@@ -1019,16 +1020,16 @@ void *cmm_xlator_alloc_buf(struct cmm_xlatorobject *xlator, void *va_buf,
if (xlator_obj) {
attrs.ul_seg_id = xlator_obj->ul_seg_id;
- *(volatile u32 *)va_buf = 0;
+ __raw_writel(0, va_buf);
/* Alloc SM */
pbuf =
cmm_calloc_buf(xlator_obj->hcmm_mgr, pa_size, &attrs, NULL);
if (pbuf) {
/* convert to translator(node/strm) process Virtual
* address */
- *(volatile u32 **)va_buf =
- (u32 *) cmm_xlator_translate(xlator,
+ tmp_va_buff = cmm_xlator_translate(xlator,
pbuf, CMM_PA2VA);
+ __raw_writel((u32)tmp_va_buff, va_buf);
a) is the u32 cast of tmp_va_buff really necessary?
b) tmp_va_buff is used only in this branch, why not reduce the scope of
the variable to just to this if branch
or an optional way could be:
--- a/drivers/staging/tidspbridge/pmgr/cmm.c
+++ b/drivers/staging/tidspbridge/pmgr/cmm.c
@@ -1022,18 +1022,17 @@ void *cmm_xlator_alloc_buf(struct
cmm_xlatorobject *xlator, void *va_buf,
DBC_REQUIRE(xlator_obj->ul_seg_id > 0);
if (xlator_obj) {
+ void *t_buf = 0;
attrs.ul_seg_id = xlator_obj->ul_seg_id;
- *(volatile u32 *)va_buf = 0;
/* Alloc SM */
pbuf =
cmm_calloc_buf(xlator_obj->hcmm_mgr, pa_size, &attrs, NULL);
if (pbuf) {
/* convert to translator(node/strm) process Virtual
* address */
- *(volatile u32 **)va_buf =
- (u32 *) cmm_xlator_translate(xlator,
- pbuf, CMM_PA2VA);
+ t_buf = cmm_xlator_translate(xlator, pbuf, CMM_PA2VA);
}
+ writel(t_buf, va_buf);
}
return pbuf;
}
}
}
return pbuf;
--
Regards,
Nishanth Menon
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