[PATCH v3 0/4] support smc91x on mainstone and devicetree

[PATCH v3 0/4] support smc91x on mainstone and devicetree

[Robert Jarzmik]

This serie aims at bringing support to mainstone board on a device-tree based
build, as what is already in place for legacy mainstone.

The bulk of the mainstone "specific" behavior is that a u16 write doesn't work
on a address of the form 4*n + 2, while it works on 4*n.

The legacy workaround was in SMC_outw(), with calls to
machine_is_mainstone(). These calls don't work with a pxa27x-dt machine type,
which is used when a generic device-tree pxa27x machine is used to boot the
mainstone board.

Therefore, this serie enables the smc91c111 adapter of the mainstone board to
work on a device-tree build, exaclty as it's been working for years with the
legacy arch/arm/mach-pxa/mainstone.c definition.

As a sum up, this extends an existing mechanism to device-tree based pxa platforms.

Cheers.

--
Robert

Robert Jarzmik (4):
  ARM: pxa: enhance smc91x platform data
  net: smc91x: isolate u16 writes alignment workaround
  net: smc91x: take into account half-word workaround
  net: smsc91x: add u16 workaround for pxa platforms

 .../devicetree/bindings/net/smsc-lan91c111.txt     |  2 +
 arch/arm/mach-pxa/idp.c                            |  1 +
 arch/arm/mach-pxa/mainstone.c                      |  1 +
 arch/arm/mach-pxa/stargate2.c                      |  1 +
 arch/mn10300/unit-asb2303/include/unit/smc91111.h  |  2 +-
 drivers/net/ethernet/smsc/smc91x.c                 |  5 +-
 drivers/net/ethernet/smsc/smc91x.h                 | 82 ++++++++++++----------
 include/linux/smc91x.h                             |  1 +
 8 files changed, 55 insertions(+), 40 deletions(-)

-- 
2.1.4

[PATCH v3 1/4] ARM: pxa: enhance smc91x platform data

[Robert Jarzmik]

Instead of having the smc91x driver relying on machine_is_*() calls,
provide this data through platform data, ie. idp, mainstone and
stargate.

This way, the driver doesn't need anymore machine_is_*() calls, which
wouldn't work anymore with a device-tree build.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 arch/arm/mach-pxa/idp.c       | 1 +
 arch/arm/mach-pxa/mainstone.c | 1 +
 arch/arm/mach-pxa/stargate2.c | 1 +
 include/linux/smc91x.h        | 1 +
 4 files changed, 4 insertions(+)

diff --git a/arch/arm/mach-pxa/idp.c b/arch/arm/mach-pxa/idp.c
index 66070acaa888..d1db32b1a2c6 100644
--- a/arch/arm/mach-pxa/idp.c
+++ b/arch/arm/mach-pxa/idp.c
@@ -85,6 +85,7 @@ static struct resource smc91x_resources[] = {
 static struct smc91x_platdata smc91x_platdata = {
 	.flags = SMC91X_USE_8BIT | SMC91X_USE_16BIT | SMC91X_USE_32BIT |
 		 SMC91X_USE_DMA | SMC91X_NOWAIT,
+	.pxa_u16_align4 = true,
 };
 
 static struct platform_device smc91x_device = {
diff --git a/arch/arm/mach-pxa/mainstone.c b/arch/arm/mach-pxa/mainstone.c
index 40964069a17c..a2d851a3a546 100644
--- a/arch/arm/mach-pxa/mainstone.c
+++ b/arch/arm/mach-pxa/mainstone.c
@@ -140,6 +140,7 @@ static struct resource smc91x_resources[] = {
 static struct smc91x_platdata mainstone_smc91x_info = {
 	.flags	= SMC91X_USE_8BIT | SMC91X_USE_16BIT | SMC91X_USE_32BIT |
 		  SMC91X_NOWAIT | SMC91X_USE_DMA,
+	.pxa_u16_align4 = true,
 };
 
 static struct platform_device smc91x_device = {
diff --git a/arch/arm/mach-pxa/stargate2.c b/arch/arm/mach-pxa/stargate2.c
index 702f4f14b708..7b6610e9dae4 100644
--- a/arch/arm/mach-pxa/stargate2.c
+++ b/arch/arm/mach-pxa/stargate2.c
@@ -673,6 +673,7 @@ static struct resource smc91x_resources[] = {
 static struct smc91x_platdata stargate2_smc91x_info = {
 	.flags = SMC91X_USE_8BIT | SMC91X_USE_16BIT | SMC91X_USE_32BIT
 	| SMC91X_NOWAIT | SMC91X_USE_DMA,
+	.pxa_u16_align4 = true,
 };
 
 static struct platform_device smc91x_device = {
diff --git a/include/linux/smc91x.h b/include/linux/smc91x.h
index e302c447e057..129bc674dcf5 100644
--- a/include/linux/smc91x.h
+++ b/include/linux/smc91x.h
@@ -39,6 +39,7 @@ struct smc91x_platdata {
 	unsigned long flags;
 	unsigned char leda;
 	unsigned char ledb;
+	bool pxa_u16_align4;	/* PXA buggy u16 writes on 4*n+2 addresses */
 };
 
 #endif /* __SMC91X_H__ */
-- 
2.1.4

[PATCH v3 2/4] net: smc91x: isolate u16 writes alignment workaround

[Robert Jarzmik]

Writes to u16 has a special handling on 3 PXA platforms, where the
hardware wiring forces these writes to be u32 aligned.

This patch isolates this handling for PXA platforms as before, but
enables this "workaround" to be set up dynamically, which will be the
case in device-tree build types.

This patch was tested on 2 PXA platforms : mainstone, which relies on
the workaround, and lubbock, which doesn't.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
--
Since v2: fixed arch/mn10300 case
      	  removed machine_is_*() calls
---
 arch/mn10300/unit-asb2303/include/unit/smc91111.h |  2 +-
 drivers/net/ethernet/smsc/smc91x.c                |  3 +-
 drivers/net/ethernet/smsc/smc91x.h                | 82 ++++++++++++-----------
 3 files changed, 47 insertions(+), 40 deletions(-)

diff --git a/arch/mn10300/unit-asb2303/include/unit/smc91111.h b/arch/mn10300/unit-asb2303/include/unit/smc91111.h
index dd456e9c513f..dd4e2946438e 100644
--- a/arch/mn10300/unit-asb2303/include/unit/smc91111.h
+++ b/arch/mn10300/unit-asb2303/include/unit/smc91111.h
@@ -30,7 +30,7 @@
 
 #if SMC_CAN_USE_16BIT
 #define SMC_inw(a, r)		inw((unsigned long) ((a) + (r)))
-#define SMC_outw(v, a, r)	outw(v, (unsigned long) ((a) + (r)))
+#define SMC_outw(lp, v, a, r)	outw(v, (unsigned long) ((a) + (r)))
 #define SMC_insw(a, r, p, l)	insw((unsigned long) ((a) + (r)), (p), (l))
 #define SMC_outsw(a, r, p, l)	outsw((unsigned long) ((a) + (r)), (p), (l))
 #endif
diff --git a/drivers/net/ethernet/smsc/smc91x.c b/drivers/net/ethernet/smsc/smc91x.c
index 9b4780f87863..705d99b2d947 100644
--- a/drivers/net/ethernet/smsc/smc91x.c
+++ b/drivers/net/ethernet/smsc/smc91x.c
@@ -602,7 +602,8 @@ static void smc_hardware_send_pkt(unsigned long data)
 	SMC_PUSH_DATA(lp, buf, len & ~1);
 
 	/* Send final ctl word with the last byte if there is one */
-	SMC_outw(((len & 1) ? (0x2000 | buf[len-1]) : 0), ioaddr, DATA_REG(lp));
+	SMC_outw(lp, ((len & 1) ? (0x2000 | buf[len - 1]) : 0), ioaddr,
+		 DATA_REG(lp));
 
 	/*
 	 * If THROTTLE_TX_PKTS is set, we stop the queue here. This will
diff --git a/drivers/net/ethernet/smsc/smc91x.h b/drivers/net/ethernet/smsc/smc91x.h
index ea8465467469..45e6b81a6a92 100644
--- a/drivers/net/ethernet/smsc/smc91x.h
+++ b/drivers/net/ethernet/smsc/smc91x.h
@@ -63,8 +63,6 @@
 
 #if defined(CONFIG_ARM)
 
-#include <asm/mach-types.h>
-
 /* Now the bus width is specified in the platform data
  * pretend here to support all I/O access types
  */
@@ -86,11 +84,11 @@
 
 #define SMC_inl(a, r)		readl((a) + (r))
 #define SMC_outb(v, a, r)	writeb(v, (a) + (r))
-#define SMC_outw(v, a, r)						\
+#define SMC_outw(lp, v, a, r)						\
 	do {								\
 		unsigned int __v = v, __smc_r = r;			\
 		if (SMC_16BIT(lp))					\
-			__SMC_outw(__v, a, __smc_r);			\
+			__SMC_outw(lp, __v, a, __smc_r);		\
 		else if (SMC_8BIT(lp))					\
 			SMC_outw_b(__v, a, __smc_r);			\
 		else							\
@@ -107,10 +105,10 @@
 #define SMC_IRQ_FLAGS		(-1)	/* from resource */
 
 /* We actually can't write halfwords properly if not word aligned */
-static inline void __SMC_outw(u16 val, void __iomem *ioaddr, int reg)
+static inline void _SMC_outw_align4(u16 val, void __iomem *ioaddr, int reg,
+				    bool use_align4_workaround)
 {
-	if ((machine_is_mainstone() || machine_is_stargate2() ||
-	     machine_is_pxa_idp()) && reg & 2) {
+	if (use_align4_workaround) {
 		unsigned int v = val << 16;
 		v |= readl(ioaddr + (reg & ~2)) & 0xffff;
 		writel(v, ioaddr + (reg & ~2));
@@ -119,6 +117,12 @@ static inline void __SMC_outw(u16 val, void __iomem *ioaddr, int reg)
 	}
 }
 
+#define __SMC_outw(lp, v, a, r)						\
+	_SMC_outw_align4((v), (a), (r),					\
+			 IS_BUILTIN(CONFIG_ARCH_PXA) && ((r) & 2) &&	\
+			 (lp)->cfg.pxa_u16_align4)
+
+
 #elif	defined(CONFIG_SH_SH4202_MICRODEV)
 
 #define SMC_CAN_USE_8BIT	0
@@ -129,7 +133,7 @@ static inline void __SMC_outw(u16 val, void __iomem *ioaddr, int reg)
 #define SMC_inw(a, r)		inw((a) + (r) - 0xa0000000)
 #define SMC_inl(a, r)		inl((a) + (r) - 0xa0000000)
 #define SMC_outb(v, a, r)	outb(v, (a) + (r) - 0xa0000000)
-#define SMC_outw(v, a, r)	outw(v, (a) + (r) - 0xa0000000)
+#define SMC_outw(lp, v, a, r)	outw(v, (a) + (r) - 0xa0000000)
 #define SMC_outl(v, a, r)	outl(v, (a) + (r) - 0xa0000000)
 #define SMC_insl(a, r, p, l)	insl((a) + (r) - 0xa0000000, p, l)
 #define SMC_outsl(a, r, p, l)	outsl((a) + (r) - 0xa0000000, p, l)
@@ -147,7 +151,7 @@ static inline void __SMC_outw(u16 val, void __iomem *ioaddr, int reg)
 #define SMC_inb(a, r)		inb(((u32)a) + (r))
 #define SMC_inw(a, r)		inw(((u32)a) + (r))
 #define SMC_outb(v, a, r)	outb(v, ((u32)a) + (r))
-#define SMC_outw(v, a, r)	outw(v, ((u32)a) + (r))
+#define SMC_outw(lp, v, a, r)	outw(v, ((u32)a) + (r))
 #define SMC_insw(a, r, p, l)	insw(((u32)a) + (r), p, l)
 #define SMC_outsw(a, r, p, l)	outsw(((u32)a) + (r), p, l)
 
@@ -175,7 +179,7 @@ static inline void __SMC_outw(u16 val, void __iomem *ioaddr, int reg)
 #define SMC_inw(a, r)           readw((a) + (r))
 #define SMC_inl(a, r)           readl((a) + (r))
 #define SMC_outb(v, a, r)       writeb(v, (a) + (r))
-#define SMC_outw(v, a, r)       writew(v, (a) + (r))
+#define SMC_outw(lp, v, a, r)   writew(v, (a) + (r))
 #define SMC_outl(v, a, r)       writel(v, (a) + (r))
 #define SMC_insw(a, r, p, l)    readsw((a) + (r), p, l)
 #define SMC_outsw(a, r, p, l)   writesw((a) + (r), p, l)
@@ -207,7 +211,7 @@ static inline void mcf_outsw(void *a, unsigned char *p, int l)
 }
 
 #define SMC_inw(a, r)		_swapw(readw((a) + (r)))
-#define SMC_outw(v, a, r)	writew(_swapw(v), (a) + (r))
+#define SMC_outw(lp, v, a, r)	writew(_swapw(v), (a) + (r))
 #define SMC_insw(a, r, p, l)	mcf_insw(a + r, p, l)
 #define SMC_outsw(a, r, p, l)	mcf_outsw(a + r, p, l)
 
@@ -241,7 +245,7 @@ static inline void mcf_outsw(void *a, unsigned char *p, int l)
 #define SMC_inw(a, r)		ioread16((a) + (r))
 #define SMC_inl(a, r)		ioread32((a) + (r))
 #define SMC_outb(v, a, r)	iowrite8(v, (a) + (r))
-#define SMC_outw(v, a, r)	iowrite16(v, (a) + (r))
+#define SMC_outw(lp, v, a, r)	iowrite16(v, (a) + (r))
 #define SMC_outl(v, a, r)	iowrite32(v, (a) + (r))
 #define SMC_insw(a, r, p, l)	ioread16_rep((a) + (r), p, l)
 #define SMC_outsw(a, r, p, l)	iowrite16_rep((a) + (r), p, l)
@@ -303,6 +307,8 @@ struct smc_local {
 
 	/* the low address lines on some platforms aren't connected... */
 	int	io_shift;
+	/* on some platforms a u16 write must be 4-bytes aligned */
+	bool	half_word_align4;
 
 	struct smc91x_platdata cfg;
 };
@@ -457,7 +463,7 @@ smc_pxa_dma_insw(void __iomem *ioaddr, struct smc_local *lp, int reg, int dma,
 
 #if ! SMC_CAN_USE_16BIT
 
-#define SMC_outw(x, ioaddr, reg)	SMC_outw_b(x, ioaddr, reg)
+#define SMC_outw(lp, x, ioaddr, reg)	SMC_outw_b(x, ioaddr, reg)
 #define SMC_inw(ioaddr, reg)		SMC_inw_b(ioaddr, reg)
 #define SMC_insw(a, r, p, l)		BUG()
 #define SMC_outsw(a, r, p, l)		BUG()
@@ -909,7 +915,7 @@ static const char * chip_ids[ 16 ] =  {
 		else if (SMC_8BIT(lp))				\
 			SMC_outb(x, ioaddr, PN_REG(lp));		\
 		else							\
-			SMC_outw(x, ioaddr, PN_REG(lp));		\
+			SMC_outw(lp, x, ioaddr, PN_REG(lp));		\
 	} while (0)
 
 #define SMC_GET_AR(lp)						\
@@ -937,7 +943,7 @@ static const char * chip_ids[ 16 ] =  {
 			int __mask;					\
 			local_irq_save(__flags);			\
 			__mask = SMC_inw(ioaddr, INT_REG(lp)) & ~0xff; \
-			SMC_outw(__mask | (x), ioaddr, INT_REG(lp));	\
+			SMC_outw(lp, __mask | (x), ioaddr, INT_REG(lp)); \
 			local_irq_restore(__flags);			\
 		}							\
 	} while (0)
@@ -951,7 +957,7 @@ static const char * chip_ids[ 16 ] =  {
 		if (SMC_8BIT(lp))					\
 			SMC_outb(x, ioaddr, IM_REG(lp));		\
 		else							\
-			SMC_outw((x) << 8, ioaddr, INT_REG(lp));	\
+			SMC_outw(lp, (x) << 8, ioaddr, INT_REG(lp));	\
 	} while (0)
 
 #define SMC_CURRENT_BANK(lp)	SMC_inw(ioaddr, BANK_SELECT)
@@ -961,22 +967,22 @@ static const char * chip_ids[ 16 ] =  {
 		if (SMC_MUST_ALIGN_WRITE(lp))				\
 			SMC_outl((x)<<16, ioaddr, 12<<SMC_IO_SHIFT);	\
 		else							\
-			SMC_outw(x, ioaddr, BANK_SELECT);		\
+			SMC_outw(lp, x, ioaddr, BANK_SELECT);		\
 	} while (0)
 
 #define SMC_GET_BASE(lp)		SMC_inw(ioaddr, BASE_REG(lp))
 
-#define SMC_SET_BASE(lp, x)		SMC_outw(x, ioaddr, BASE_REG(lp))
+#define SMC_SET_BASE(lp, x)	SMC_outw(lp, x, ioaddr, BASE_REG(lp))
 
 #define SMC_GET_CONFIG(lp)	SMC_inw(ioaddr, CONFIG_REG(lp))
 
-#define SMC_SET_CONFIG(lp, x)	SMC_outw(x, ioaddr, CONFIG_REG(lp))
+#define SMC_SET_CONFIG(lp, x)	SMC_outw(lp, x, ioaddr, CONFIG_REG(lp))
 
 #define SMC_GET_COUNTER(lp)	SMC_inw(ioaddr, COUNTER_REG(lp))
 
 #define SMC_GET_CTL(lp)		SMC_inw(ioaddr, CTL_REG(lp))
 
-#define SMC_SET_CTL(lp, x)		SMC_outw(x, ioaddr, CTL_REG(lp))
+#define SMC_SET_CTL(lp, x)	SMC_outw(lp, x, ioaddr, CTL_REG(lp))
 
 #define SMC_GET_MII(lp)		SMC_inw(ioaddr, MII_REG(lp))
 
@@ -987,20 +993,20 @@ static const char * chip_ids[ 16 ] =  {
 		if (SMC_MUST_ALIGN_WRITE(lp))				\
 			SMC_outl((x)<<16, ioaddr, SMC_REG(lp, 8, 1));	\
 		else							\
-			SMC_outw(x, ioaddr, GP_REG(lp));		\
+			SMC_outw(lp, x, ioaddr, GP_REG(lp));		\
 	} while (0)
 
-#define SMC_SET_MII(lp, x)		SMC_outw(x, ioaddr, MII_REG(lp))
+#define SMC_SET_MII(lp, x)	SMC_outw(lp, x, ioaddr, MII_REG(lp))
 
 #define SMC_GET_MIR(lp)		SMC_inw(ioaddr, MIR_REG(lp))
 
-#define SMC_SET_MIR(lp, x)		SMC_outw(x, ioaddr, MIR_REG(lp))
+#define SMC_SET_MIR(lp, x)	SMC_outw(lp, x, ioaddr, MIR_REG(lp))
 
 #define SMC_GET_MMU_CMD(lp)	SMC_inw(ioaddr, MMU_CMD_REG(lp))
 
-#define SMC_SET_MMU_CMD(lp, x)	SMC_outw(x, ioaddr, MMU_CMD_REG(lp))
+#define SMC_SET_MMU_CMD(lp, x)	SMC_outw(lp, x, ioaddr, MMU_CMD_REG(lp))
 
-#define SMC_GET_FIFO(lp)		SMC_inw(ioaddr, FIFO_REG(lp))
+#define SMC_GET_FIFO(lp)	SMC_inw(ioaddr, FIFO_REG(lp))
 
 #define SMC_GET_PTR(lp)		SMC_inw(ioaddr, PTR_REG(lp))
 
@@ -1009,14 +1015,14 @@ static const char * chip_ids[ 16 ] =  {
 		if (SMC_MUST_ALIGN_WRITE(lp))				\
 			SMC_outl((x)<<16, ioaddr, SMC_REG(lp, 4, 2));	\
 		else							\
-			SMC_outw(x, ioaddr, PTR_REG(lp));		\
+			SMC_outw(lp, x, ioaddr, PTR_REG(lp));		\
 	} while (0)
 
 #define SMC_GET_EPH_STATUS(lp)	SMC_inw(ioaddr, EPH_STATUS_REG(lp))
 
 #define SMC_GET_RCR(lp)		SMC_inw(ioaddr, RCR_REG(lp))
 
-#define SMC_SET_RCR(lp, x)		SMC_outw(x, ioaddr, RCR_REG(lp))
+#define SMC_SET_RCR(lp, x)		SMC_outw(lp, x, ioaddr, RCR_REG(lp))
 
 #define SMC_GET_REV(lp)		SMC_inw(ioaddr, REV_REG(lp))
 
@@ -1027,12 +1033,12 @@ static const char * chip_ids[ 16 ] =  {
 		if (SMC_MUST_ALIGN_WRITE(lp))				\
 			SMC_outl((x)<<16, ioaddr, SMC_REG(lp, 8, 0));	\
 		else							\
-			SMC_outw(x, ioaddr, RPC_REG(lp));		\
+			SMC_outw(lp, x, ioaddr, RPC_REG(lp));		\
 	} while (0)
 
 #define SMC_GET_TCR(lp)		SMC_inw(ioaddr, TCR_REG(lp))
 
-#define SMC_SET_TCR(lp, x)		SMC_outw(x, ioaddr, TCR_REG(lp))
+#define SMC_SET_TCR(lp, x)	SMC_outw(lp, x, ioaddr, TCR_REG(lp))
 
 #ifndef SMC_GET_MAC_ADDR
 #define SMC_GET_MAC_ADDR(lp, addr)					\
@@ -1049,18 +1055,18 @@ static const char * chip_ids[ 16 ] =  {
 
 #define SMC_SET_MAC_ADDR(lp, addr)					\
 	do {								\
-		SMC_outw(addr[0]|(addr[1] << 8), ioaddr, ADDR0_REG(lp)); \
-		SMC_outw(addr[2]|(addr[3] << 8), ioaddr, ADDR1_REG(lp)); \
-		SMC_outw(addr[4]|(addr[5] << 8), ioaddr, ADDR2_REG(lp)); \
+		SMC_outw(lp, addr[0] | (addr[1] << 8), ioaddr, ADDR0_REG(lp)); \
+		SMC_outw(lp, addr[2] | (addr[3] << 8), ioaddr, ADDR1_REG(lp)); \
+		SMC_outw(lp, addr[4] | (addr[5] << 8), ioaddr, ADDR2_REG(lp)); \
 	} while (0)
 
 #define SMC_SET_MCAST(lp, x)						\
 	do {								\
 		const unsigned char *mt = (x);				\
-		SMC_outw(mt[0] | (mt[1] << 8), ioaddr, MCAST_REG1(lp)); \
-		SMC_outw(mt[2] | (mt[3] << 8), ioaddr, MCAST_REG2(lp)); \
-		SMC_outw(mt[4] | (mt[5] << 8), ioaddr, MCAST_REG3(lp)); \
-		SMC_outw(mt[6] | (mt[7] << 8), ioaddr, MCAST_REG4(lp)); \
+		SMC_outw(lp, mt[0] | (mt[1] << 8), ioaddr, MCAST_REG1(lp)); \
+		SMC_outw(lp, mt[2] | (mt[3] << 8), ioaddr, MCAST_REG2(lp)); \
+		SMC_outw(lp, mt[4] | (mt[5] << 8), ioaddr, MCAST_REG3(lp)); \
+		SMC_outw(lp, mt[6] | (mt[7] << 8), ioaddr, MCAST_REG4(lp)); \
 	} while (0)
 
 #define SMC_PUT_PKT_HDR(lp, status, length)				\
@@ -1069,8 +1075,8 @@ static const char * chip_ids[ 16 ] =  {
 			SMC_outl((status) | (length)<<16, ioaddr,	\
 				 DATA_REG(lp));			\
 		else {							\
-			SMC_outw(status, ioaddr, DATA_REG(lp));	\
-			SMC_outw(length, ioaddr, DATA_REG(lp));	\
+			SMC_outw(lp, status, ioaddr, DATA_REG(lp));	\
+			SMC_outw(lp, length, ioaddr, DATA_REG(lp));	\
 		}							\
 	} while (0)
 
-- 
2.1.4

[PATCH v3 3/4] net: smc91x: take into account half-word workaround

[Robert Jarzmik]

For device-tree builds, platforms such as mainstone, idp and stargate2
must have their u16 writes all aligned on 32 bit boundaries. This is
already enabled in platform data builds, and this patch adds it to
device-tree builds.

Signed-off-by: Robert Jarzmik <robert.jarzmik-GANU6spQydw@public.gmane.org>
---
Since v1: rename dt property to pxa-u16-align4
---
 drivers/net/ethernet/smsc/smc91x.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/smsc/smc91x.c b/drivers/net/ethernet/smsc/smc91x.c
index 705d99b2d947..65077c77082a 100644
--- a/drivers/net/ethernet/smsc/smc91x.c
+++ b/drivers/net/ethernet/smsc/smc91x.c
@@ -2326,6 +2326,8 @@ static int smc_drv_probe(struct platform_device *pdev)
 		if (!device_property_read_u32(&pdev->dev, "reg-shift",
 					      &val))
 			lp->io_shift = val;
+		lp->cfg.pxa_u16_align4 =
+			device_property_read_bool(&pdev->dev, "pxa-u16-align4");
 	}
 #endif
 
-- 
2.1.4

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[PATCH v3 4/4] net: smsc91x: add u16 workaround for pxa platforms

[Robert Jarzmik]

Add a workaround for mainstone, idp and stargate2 boards, for u16 writes
which must be aligned on 32 bits addresses.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Jeremy Linton <jeremy.linton@arm.com>
---
Since v1: rename dt property to pxa-u16-align4
      	  change the binding documentation file
---
 Documentation/devicetree/bindings/net/smsc-lan91c111.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
index e77e167593db..309e37eb7c7c 100644
--- a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
+++ b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
@@ -13,3 +13,5 @@ Optional properties:
   16-bit access only.
 - power-gpios: GPIO to control the PWRDWN pin
 - reset-gpios: GPIO to control the RESET pin
+- pxa-u16-align4 : Boolean, put in place the workaround the force all
+		   u16 writes to be 32 bits aligned
-- 
2.1.4

Re: [PATCH v3 4/4] net: smsc91x: add u16 workaround for pxa platforms

[Rob Herring]

On Mon, Oct 17, 2016 at 09:45:32PM +0200, Robert Jarzmik wrote:
> Add a workaround for mainstone, idp and stargate2 boards, for u16 writes
> which must be aligned on 32 bits addresses.
> 
> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
> Cc: Jeremy Linton <jeremy.linton@arm.com>
> ---
> Since v1: rename dt property to pxa-u16-align4
>       	  change the binding documentation file
> ---
>  Documentation/devicetree/bindings/net/smsc-lan91c111.txt | 2 ++
>  1 file changed, 2 insertions(+)

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v3 0/4] support smc91x on mainstone and devicetree

[David Miller]

From: Robert Jarzmik <robert.jarzmik@free.fr>
Date: Mon, 17 Oct 2016 21:45:28 +0200

> This serie aims at bringing support to mainstone board on a device-tree based
> build, as what is already in place for legacy mainstone.
> 
> The bulk of the mainstone "specific" behavior is that a u16 write doesn't work
> on a address of the form 4*n + 2, while it works on 4*n.
> 
> The legacy workaround was in SMC_outw(), with calls to
> machine_is_mainstone(). These calls don't work with a pxa27x-dt machine type,
> which is used when a generic device-tree pxa27x machine is used to boot the
> mainstone board.
> 
> Therefore, this serie enables the smc91c111 adapter of the mainstone board to
> work on a device-tree build, exaclty as it's been working for years with the
> legacy arch/arm/mach-pxa/mainstone.c definition.
> 
> As a sum up, this extends an existing mechanism to device-tree based pxa platforms.

Series applied, thanks.