diff mbox

[19/24] sh: use __iomem pointers for MMIO

Message ID 1347658492-11608-20-git-send-email-arnd@arndb.de (mailing list archive)
State Rejected
Headers show

Commit Message

Arnd Bergmann Sept. 14, 2012, 9:34 p.m. UTC 
ARM is moving to stricter checks on readl/write functions,
so we need to use the correct types everywhere.

I'm not completely sure about this patch, and it will
probably require some arch/sh changes to go along with it,
but it's clear that something has to be done to avoid
getting hundreds of new warnings on each shmobile build
in v3.7.
Please see this as a prototype.

Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: linux-sh@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/sh/intc/access.c    |   56 +++++++++++++++++++++----------------------
 drivers/sh/intc/chip.c      |    8 +++----
 drivers/sh/intc/core.c      |    6 +++--
 drivers/sh/intc/handle.c    |    6 ++---
 drivers/sh/intc/internals.h |   18 +++++++-------
 drivers/sh/intc/virq.c      |    3 ++-
 include/linux/sh_clk.h      |    4 ++--
 7 files changed, 52 insertions(+), 49 deletions(-)

Comments

Paul Mundt Sept. 18, 2012, 7:37 a.m. UTC | #1 
On Fri, Sep 14, 2012 at 11:34:47PM +0200, Arnd Bergmann wrote:
> ARM is moving to stricter checks on readl/write functions,
> so we need to use the correct types everywhere.
> 
> I'm not completely sure about this patch, and it will
> probably require some arch/sh changes to go along with it,
> but it's clear that something has to be done to avoid
> getting hundreds of new warnings on each shmobile build
> in v3.7.
> Please see this as a prototype.
> 
I have no intention of making this change for arch/sh.

The __raw variants already accept both __iomem pointers and integer
addresses, which was largely intentional. New code could use the __iomem
annotations while older code could continue to use the integer addresses
without issue. If you wish to go through the kernel and audit every
single __raw user, you're certainly welcome to, but until then such a
change is premature.
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Arnd Bergmann Sept. 18, 2012, 8:01 a.m. UTC | #2 
On Tuesday 18 September 2012, Paul Mundt wrote:
> On Fri, Sep 14, 2012 at 11:34:47PM +0200, Arnd Bergmann wrote:
> > ARM is moving to stricter checks on readl/write functions,
> > so we need to use the correct types everywhere.
> > 
> > I'm not completely sure about this patch, and it will
> > probably require some arch/sh changes to go along with it,
> > but it's clear that something has to be done to avoid
> > getting hundreds of new warnings on each shmobile build
> > in v3.7.
> > Please see this as a prototype.
> > 
> I have no intention of making this change for arch/sh.
> 
> The __raw variants already accept both __iomem pointers and integer
> addresses, which was largely intentional. New code could use the __iomem
> annotations while older code could continue to use the integer addresses
> without issue.

Ok, I'm dropping this patch from the series then.

> If you wish to go through the kernel and audit every
> single __raw user, you're certainly welcome to, but until then such a
> change is premature.

I've done it for all the defconfig files for now, which probably covers
most of the drivers that are relevant on ARM. I still have a backlog
of unrelated warning fixes from that. Once I'm done with those, I'm planning
to do another round of randconfig builds, which hopefully catches the
rest. I'll just exclude drivers/sh from those builds for now.

	Arnd

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diff mbox

Patch

diff --git a/drivers/sh/intc/access.c b/drivers/sh/intc/access.c
index f892ae1..5bd0a56 100644
--- a/drivers/sh/intc/access.c
+++ b/drivers/sh/intc/access.c
@@ -11,7 +11,7 @@ 
 #include <linux/io.h>
 #include "internals.h"
 
-unsigned long intc_phys_to_virt(struct intc_desc_int *d, unsigned long address)
+void __iomem *intc_phys_to_virt(struct intc_desc_int *d, unsigned long address)
 {
 	struct intc_window *window;
 	int k;
@@ -27,23 +27,23 @@  unsigned long intc_phys_to_virt(struct intc_desc_int *d, unsigned long address)
 			continue;
 
 		address -= window->phys;
-		address += (unsigned long)window->virt;
 
-		return address;
+		return window->virt + address;
 	}
 
 	/* no windows defined, register must be 1:1 mapped virt:phys */
-	return address;
+	return (void __iomem *)address;
 }
 
 unsigned int intc_get_reg(struct intc_desc_int *d, unsigned long address)
 {
 	unsigned int k;
+	void __iomem *virt;
 
-	address = intc_phys_to_virt(d, address);
+	virt = intc_phys_to_virt(d, address);
 
 	for (k = 0; k < d->nr_reg; k++) {
-		if (d->reg[k] == address)
+		if (d->reg[k] == virt)
 			return k;
 	}
 
@@ -72,25 +72,25 @@  unsigned long intc_get_field_from_handle(unsigned int value, unsigned int handle
 	return (value & mask) >> shift;
 }
 
-static unsigned long test_8(unsigned long addr, unsigned long h,
+static unsigned long test_8(void __iomem * addr, unsigned long h,
 			    unsigned long ignore)
 {
 	return intc_get_field_from_handle(__raw_readb(addr), h);
 }
 
-static unsigned long test_16(unsigned long addr, unsigned long h,
+static unsigned long test_16(void __iomem * addr, unsigned long h,
 			     unsigned long ignore)
 {
 	return intc_get_field_from_handle(__raw_readw(addr), h);
 }
 
-static unsigned long test_32(unsigned long addr, unsigned long h,
+static unsigned long test_32(void __iomem * addr, unsigned long h,
 			     unsigned long ignore)
 {
 	return intc_get_field_from_handle(__raw_readl(addr), h);
 }
 
-static unsigned long write_8(unsigned long addr, unsigned long h,
+static unsigned long write_8(void __iomem * addr, unsigned long h,
 			     unsigned long data)
 {
 	__raw_writeb(intc_set_field_from_handle(0, data, h), addr);
@@ -98,7 +98,7 @@  static unsigned long write_8(unsigned long addr, unsigned long h,
 	return 0;
 }
 
-static unsigned long write_16(unsigned long addr, unsigned long h,
+static unsigned long write_16(void __iomem * addr, unsigned long h,
 			      unsigned long data)
 {
 	__raw_writew(intc_set_field_from_handle(0, data, h), addr);
@@ -106,7 +106,7 @@  static unsigned long write_16(unsigned long addr, unsigned long h,
 	return 0;
 }
 
-static unsigned long write_32(unsigned long addr, unsigned long h,
+static unsigned long write_32(void __iomem * addr, unsigned long h,
 			      unsigned long data)
 {
 	__raw_writel(intc_set_field_from_handle(0, data, h), addr);
@@ -114,7 +114,7 @@  static unsigned long write_32(unsigned long addr, unsigned long h,
 	return 0;
 }
 
-static unsigned long modify_8(unsigned long addr, unsigned long h,
+static unsigned long modify_8(void __iomem * addr, unsigned long h,
 			      unsigned long data)
 {
 	unsigned long flags;
@@ -127,7 +127,7 @@  static unsigned long modify_8(unsigned long addr, unsigned long h,
 	return 0;
 }
 
-static unsigned long modify_16(unsigned long addr, unsigned long h,
+static unsigned long modify_16(void __iomem * addr, unsigned long h,
 			       unsigned long data)
 {
 	unsigned long flags;
@@ -140,7 +140,7 @@  static unsigned long modify_16(unsigned long addr, unsigned long h,
 	return 0;
 }
 
-static unsigned long modify_32(unsigned long addr, unsigned long h,
+static unsigned long modify_32(void __iomem * addr, unsigned long h,
 			       unsigned long data)
 {
 	unsigned long flags;
@@ -153,9 +153,9 @@  static unsigned long modify_32(unsigned long addr, unsigned long h,
 	return 0;
 }
 
-static unsigned long intc_mode_field(unsigned long addr,
+static unsigned long intc_mode_field(void __iomem * addr,
 				     unsigned long handle,
-				     unsigned long (*fn)(unsigned long,
+				     unsigned long (*fn)(void __iomem *addr,
 						unsigned long,
 						unsigned long),
 				     unsigned int irq)
@@ -163,9 +163,9 @@  static unsigned long intc_mode_field(unsigned long addr,
 	return fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1));
 }
 
-static unsigned long intc_mode_zero(unsigned long addr,
+static unsigned long intc_mode_zero(void __iomem * addr,
 				    unsigned long handle,
-				    unsigned long (*fn)(unsigned long,
+				    unsigned long (*fn)(void __iomem *addr,
 					       unsigned long,
 					       unsigned long),
 				    unsigned int irq)
@@ -173,9 +173,9 @@  static unsigned long intc_mode_zero(unsigned long addr,
 	return fn(addr, handle, 0);
 }
 
-static unsigned long intc_mode_prio(unsigned long addr,
+static unsigned long intc_mode_prio(void __iomem * addr,
 				    unsigned long handle,
-				    unsigned long (*fn)(unsigned long,
+				    unsigned long (*fn)(void __iomem *addr,
 					       unsigned long,
 					       unsigned long),
 				    unsigned int irq)
@@ -183,7 +183,7 @@  static unsigned long intc_mode_prio(unsigned long addr,
 	return fn(addr, handle, intc_get_prio_level(irq));
 }
 
-unsigned long (*intc_reg_fns[])(unsigned long addr,
+unsigned long (*intc_reg_fns[])(void __iomem * addr,
 				unsigned long h,
 				unsigned long data) = {
 	[REG_FN_TEST_BASE + 0] = test_8,
@@ -197,9 +197,9 @@  unsigned long (*intc_reg_fns[])(unsigned long addr,
 	[REG_FN_MODIFY_BASE + 3] = modify_32,
 };
 
-unsigned long (*intc_enable_fns[])(unsigned long addr,
+unsigned long (*intc_enable_fns[])(void __iomem * addr,
 				   unsigned long handle,
-				   unsigned long (*fn)(unsigned long,
+				   unsigned long (*fn)(void __iomem *,
 					    unsigned long,
 					    unsigned long),
 				   unsigned int irq) = {
@@ -210,9 +210,9 @@  unsigned long (*intc_enable_fns[])(unsigned long addr,
 	[MODE_PCLR_REG] = intc_mode_prio,
 };
 
-unsigned long (*intc_disable_fns[])(unsigned long addr,
+unsigned long (*intc_disable_fns[])(void __iomem * addr,
 				    unsigned long handle,
-				    unsigned long (*fn)(unsigned long,
+				    unsigned long (*fn)(void __iomem *,
 					     unsigned long,
 					     unsigned long),
 				    unsigned int irq) = {
@@ -223,9 +223,9 @@  unsigned long (*intc_disable_fns[])(unsigned long addr,
 	[MODE_PCLR_REG] = intc_mode_field,
 };
 
-unsigned long (*intc_enable_noprio_fns[])(unsigned long addr,
+unsigned long (*intc_enable_noprio_fns[])(void __iomem * addr,
 					  unsigned long handle,
-					  unsigned long (*fn)(unsigned long,
+					  unsigned long (*fn)(void __iomem *,
 						unsigned long,
 						unsigned long),
 					  unsigned int irq) = {
diff --git a/drivers/sh/intc/chip.c b/drivers/sh/intc/chip.c
index 012df26..2928264 100644
--- a/drivers/sh/intc/chip.c
+++ b/drivers/sh/intc/chip.c
@@ -17,7 +17,7 @@  void _intc_enable(struct irq_data *data, unsigned long handle)
 {
 	unsigned int irq = data->irq;
 	struct intc_desc_int *d = get_intc_desc(irq);
-	unsigned long addr;
+	void __iomem *addr;
 	unsigned int cpu;
 
 	for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) {
@@ -43,7 +43,7 @@  static void intc_disable(struct irq_data *data)
 	unsigned int irq = data->irq;
 	struct intc_desc_int *d = get_intc_desc(irq);
 	unsigned long handle = (unsigned long)irq_data_get_irq_chip_data(data);
-	unsigned long addr;
+	void __iomem *addr;
 	unsigned int cpu;
 
 	intc_balancing_disable(irq);
@@ -83,7 +83,7 @@  static void intc_mask_ack(struct irq_data *data)
 	unsigned int irq = data->irq;
 	struct intc_desc_int *d = get_intc_desc(irq);
 	unsigned long handle = intc_get_ack_handle(irq);
-	unsigned long addr;
+	void __iomem * addr;
 
 	intc_disable(data);
 
@@ -177,7 +177,7 @@  static int intc_set_type(struct irq_data *data, unsigned int type)
 	struct intc_desc_int *d = get_intc_desc(irq);
 	unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK];
 	struct intc_handle_int *ihp;
-	unsigned long addr;
+	void __iomem *addr;
 
 	if (!value)
 		return -EINVAL;
diff --git a/drivers/sh/intc/core.c b/drivers/sh/intc/core.c
index 32c26d7..1ddbba0 100644
--- a/drivers/sh/intc/core.c
+++ b/drivers/sh/intc/core.c
@@ -172,10 +172,12 @@  static unsigned int __init save_reg(struct intc_desc_int *d,
 				    unsigned long value,
 				    unsigned int smp)
 {
+	void __iomem *virt;
+
 	if (value) {
-		value = intc_phys_to_virt(d, value);
+		virt = intc_phys_to_virt(d, value);
 
-		d->reg[cnt] = value;
+		d->reg[cnt] = virt;
 #ifdef CONFIG_SMP
 		d->smp[cnt] = smp;
 #endif
diff --git a/drivers/sh/intc/handle.c b/drivers/sh/intc/handle.c
index 7863a44..1971ef1 100644
--- a/drivers/sh/intc/handle.c
+++ b/drivers/sh/intc/handle.c
@@ -206,10 +206,10 @@  static unsigned int intc_ack_data(struct intc_desc *desc,
 static void intc_enable_disable(struct intc_desc_int *d,
 				unsigned long handle, int do_enable)
 {
-	unsigned long addr;
+	void __iomem *addr;
 	unsigned int cpu;
-	unsigned long (*fn)(unsigned long, unsigned long,
-		   unsigned long (*)(unsigned long, unsigned long,
+	unsigned long(*fn)(void __iomem *, unsigned long,
+		   unsigned long (*)(void __iomem *, unsigned long,
 				     unsigned long),
 		   unsigned int);
 
diff --git a/drivers/sh/intc/internals.h b/drivers/sh/intc/internals.h
index 7dff08e..29e4299 100644
--- a/drivers/sh/intc/internals.h
+++ b/drivers/sh/intc/internals.h
@@ -56,7 +56,7 @@  struct intc_desc_int {
 	struct radix_tree_root tree;
 	raw_spinlock_t lock;
 	unsigned int index;
-	unsigned long *reg;
+	void * __iomem *reg;
 #ifdef CONFIG_SMP
 	unsigned long *smp;
 #endif
@@ -120,25 +120,25 @@  static inline int intc_handle_int_cmp(const void *a, const void *b)
 
 /* access.c */
 extern unsigned long
-(*intc_reg_fns[])(unsigned long addr, unsigned long h, unsigned long data);
+(*intc_reg_fns[])(void __iomem * addr, unsigned long h, unsigned long data);
 
 extern unsigned long
-(*intc_enable_fns[])(unsigned long addr, unsigned long handle,
-		     unsigned long (*fn)(unsigned long,
+(*intc_enable_fns[])(void __iomem * addr, unsigned long handle,
+		     unsigned long (*fn)(void __iomem *,
 				unsigned long, unsigned long),
 		     unsigned int irq);
 extern unsigned long
-(*intc_disable_fns[])(unsigned long addr, unsigned long handle,
-		      unsigned long (*fn)(unsigned long,
+(*intc_disable_fns[])(void __iomem * addr, unsigned long handle,
+		      unsigned long (*fn)(void __iomem *,
 				unsigned long, unsigned long),
 		      unsigned int irq);
 extern unsigned long
-(*intc_enable_noprio_fns[])(unsigned long addr, unsigned long handle,
-		            unsigned long (*fn)(unsigned long,
+(*intc_enable_noprio_fns[])(void __iomem * addr, unsigned long handle,
+		            unsigned long (*fn)(void __iomem *,
 				unsigned long, unsigned long),
 			    unsigned int irq);
 
-unsigned long intc_phys_to_virt(struct intc_desc_int *d, unsigned long address);
+void __iomem * intc_phys_to_virt(struct intc_desc_int *d, unsigned long address);
 unsigned int intc_get_reg(struct intc_desc_int *d, unsigned long address);
 unsigned int intc_set_field_from_handle(unsigned int value,
 			    unsigned int field_value,
diff --git a/drivers/sh/intc/virq.c b/drivers/sh/intc/virq.c
index f30ac93..d45cfcd 100644
--- a/drivers/sh/intc/virq.c
+++ b/drivers/sh/intc/virq.c
@@ -117,7 +117,8 @@  static void intc_virq_handler(unsigned int irq, struct irq_desc *desc)
 	chip->irq_mask_ack(data);
 
 	for_each_virq(entry, vlist) {
-		unsigned long addr, handle;
+		void __iomem *addr;
+		unsigned long handle;
 
 		handle = (unsigned long)irq_get_handler_data(entry->irq);
 		addr = INTC_REG(d, _INTC_ADDR_E(handle), 0);
diff --git a/include/linux/sh_clk.h b/include/linux/sh_clk.h
index 5091091..6579041 100644
--- a/include/linux/sh_clk.h
+++ b/include/linux/sh_clk.h
@@ -173,7 +173,7 @@  int sh_clk_div4_reparent_register(struct clk *clks, int nr,
 #define SH_CLK_DIV6_EXT(_reg, _flags, _parents,			\
 			_num_parents, _src_shift, _src_width)	\
 {								\
-	.enable_reg = (void __iomem *)_reg,			\
+	.enable_reg = _reg,					\
 	.enable_bit = 0, /* unused */				\
 	.flags = _flags | CLK_MASK_DIV_ON_DISABLE,		\
 	.div_mask = SH_CLK_DIV6_MSK,				\
@@ -186,7 +186,7 @@  int sh_clk_div4_reparent_register(struct clk *clks, int nr,
 #define SH_CLK_DIV6(_parent, _reg, _flags)			\
 {								\
 	.parent		= _parent,				\
-	.enable_reg	= (void __iomem *)_reg,			\
+	.enable_reg	= _reg,					\
 	.enable_bit	= 0,	/* unused */			\
 	.div_mask	= SH_CLK_DIV6_MSK,			\
 	.flags		= _flags | CLK_MASK_DIV_ON_DISABLE,	\