add fix for macb driver for avr32 from Linux git

target/avr32/atmel-ngw100/patches/4.1.6/0001-net-macb-improve-big-endian-CPU-support.patch

@@ -0,0 +1,282 @@
+From f2ce8a9e48385f444389e75cfe293637c3eb5410 Mon Sep 17 00:00:00 2001
+From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+Date: Fri, 24 Jul 2015 21:23:59 +0300
+Subject: [PATCH] net/macb: improve big endian CPU support
+
+The commit a50dad355a53 (net: macb: Add big endian CPU support) converted I/O
+accessors to readl_relaxed() and writel_relaxed() and consequentially broke
+MACB driver on AVR32 platforms such as ATNGW100.
+
+This patch improves I/O access by checking endiannes first and use the
+corresponding methods.
+
+Fixes: a50dad355a53 (net: macb: Add big endian CPU support)
+Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
+---
+ drivers/net/ethernet/cadence/macb.c |  103 ++++++++++++++++++++++++++---------
+ drivers/net/ethernet/cadence/macb.h |   28 ++++------
+ 2 files changed, 87 insertions(+), 44 deletions(-)
+
+diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
+index caeb395..9d06e3d 100644
+--- a/drivers/net/ethernet/cadence/macb.c
++++ b/drivers/net/ethernet/cadence/macb.c
+@@ -104,6 +104,57 @@ static void *macb_rx_buffer(struct macb *bp, unsigned int index)
+ 	return bp->rx_buffers + bp->rx_buffer_size * macb_rx_ring_wrap(index);
+ }
+ 
++/* I/O accessors */
++static u32 hw_readl_native(struct macb *bp, int offset)
++{
++	return __raw_readl(bp->regs + offset);
++}
++
++static void hw_writel_native(struct macb *bp, int offset, u32 value)
++{
++	__raw_writel(value, bp->regs + offset);
++}
++
++static u32 hw_readl(struct macb *bp, int offset)
++{
++	return readl_relaxed(bp->regs + offset);
++}
++
++static void hw_writel(struct macb *bp, int offset, u32 value)
++{
++	writel_relaxed(value, bp->regs + offset);
++}
++
++/*
++ * Find the CPU endianness by using the loopback bit of NCR register. When the
++ * CPU is in big endian we need to program swaped mode for management
++ * descriptor access.
++ */
++static bool hw_is_native_io(void __iomem *addr)
++{
++	u32 value = MACB_BIT(LLB);
++
++	__raw_writel(value, addr + MACB_NCR);
++	value = __raw_readl(addr + MACB_NCR);
++
++	/* Write 0 back to disable everything */
++	__raw_writel(0, addr + MACB_NCR);
++
++	return value == MACB_BIT(LLB);
++}
++
++static bool hw_is_gem(void __iomem *addr, bool native_io)
++{
++	u32 id;
++
++	if (native_io)
++		id = __raw_readl(addr + MACB_MID);
++	else
++		id = readl_relaxed(addr + MACB_MID);
++
++	return MACB_BFEXT(IDNUM, id) >= 0x2;
++}
++
+ static void macb_set_hwaddr(struct macb *bp)
+ {
+ 	u32 bottom;
+@@ -449,14 +500,14 @@ err_out:
+ 
+ static void macb_update_stats(struct macb *bp)
+ {
+-	u32 __iomem *reg = bp->regs + MACB_PFR;
+ 	u32 *p = &bp->hw_stats.macb.rx_pause_frames;
+ 	u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
++	int offset = MACB_PFR;
+ 
+ 	WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
+ 
+-	for(; p < end; p++, reg++)
+-		*p += readl_relaxed(reg);
++	for(; p < end; p++, offset += 4)
++		*p += bp->readl(bp, offset);
+ }
+ 
+ static int macb_halt_tx(struct macb *bp)
+@@ -1603,7 +1654,6 @@ static u32 macb_dbw(struct macb *bp)
+ static void macb_configure_dma(struct macb *bp)
+ {
+ 	u32 dmacfg;
+-	u32 tmp, ncr;
+ 
+ 	if (macb_is_gem(bp)) {
+ 		dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
+@@ -1613,22 +1663,11 @@ static void macb_configure_dma(struct macb *bp)
+ 		dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
+ 		dmacfg &= ~GEM_BIT(ENDIA_PKT);
+ 
+-		/* Find the CPU endianness by using the loopback bit of net_ctrl
+-		 * register. save it first. When the CPU is in big endian we
+-		 * need to program swaped mode for management descriptor access.
+-		 */
+-		ncr = macb_readl(bp, NCR);
+-		__raw_writel(MACB_BIT(LLB), bp->regs + MACB_NCR);
+-		tmp =  __raw_readl(bp->regs + MACB_NCR);
+-
+-		if (tmp == MACB_BIT(LLB))
++		if (bp->native_io)
+ 			dmacfg &= ~GEM_BIT(ENDIA_DESC);
+ 		else
+ 			dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */
+ 
+-		/* Restore net_ctrl */
+-		macb_writel(bp, NCR, ncr);
+-
+ 		if (bp->dev->features & NETIF_F_HW_CSUM)
+ 			dmacfg |= GEM_BIT(TXCOEN);
+ 		else
+@@ -1902,14 +1941,14 @@ static void gem_update_stats(struct macb *bp)
+ 
+ 	for (i = 0; i < GEM_STATS_LEN; ++i, ++p) {
+ 		u32 offset = gem_statistics[i].offset;
+-		u64 val = readl_relaxed(bp->regs + offset);
++		u64 val = bp->readl(bp, offset);
+ 
+ 		bp->ethtool_stats[i] += val;
+ 		*p += val;
+ 
+ 		if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) {
+ 			/* Add GEM_OCTTXH, GEM_OCTRXH */
+-			val = readl_relaxed(bp->regs + offset + 4);
++			val = bp->readl(bp, offset + 4);
+ 			bp->ethtool_stats[i] += ((u64)val) << 32;
+ 			*(++p) += val;
+ 		}
+@@ -2190,7 +2229,7 @@ static void macb_configure_caps(struct macb *bp, const struct macb_config *dt_co
+ 	if (dt_conf)
+ 		bp->caps = dt_conf->caps;
+ 
+-	if (macb_is_gem_hw(bp->regs)) {
++	if (hw_is_gem(bp->regs, bp->native_io)) {
+ 		bp->caps |= MACB_CAPS_MACB_IS_GEM;
+ 
+ 		dcfg = gem_readl(bp, DCFG1);
+@@ -2205,6 +2244,7 @@ static void macb_configure_caps(struct macb *bp, const struct macb_config *dt_co
+ }
+ 
+ static void macb_probe_queues(void __iomem *mem,
++			      bool native_io,
+ 			      unsigned int *queue_mask,
+ 			      unsigned int *num_queues)
+ {
+@@ -2219,7 +2259,7 @@ static void macb_probe_queues(void __iomem *mem,
+ 	 * we are early in the probe process and don't have the
+ 	 * MACB_CAPS_MACB_IS_GEM flag positioned
+ 	 */
+-	if (!macb_is_gem_hw(mem))
++	if (!hw_is_gem(mem, native_io))
+ 		return;
+ 
+ 	/* bit 0 is never set but queue 0 always exists */
+@@ -2786,6 +2826,7 @@ static int macb_probe(struct platform_device *pdev)
+ 	struct clk *pclk, *hclk, *tx_clk;
+ 	unsigned int queue_mask, num_queues;
+ 	struct macb_platform_data *pdata;
++	bool native_io;
+ 	struct phy_device *phydev;
+ 	struct net_device *dev;
+ 	struct resource *regs;
+@@ -2794,6 +2835,11 @@ static int macb_probe(struct platform_device *pdev)
+ 	struct macb *bp;
+ 	int err;
+ 
++	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	mem = devm_ioremap_resource(&pdev->dev, regs);
++	if (IS_ERR(mem))
++		return PTR_ERR(mem);
++
+ 	if (np) {
+ 		const struct of_device_id *match;
+ 
+@@ -2809,14 +2855,9 @@ static int macb_probe(struct platform_device *pdev)
+ 	if (err)
+ 		return err;
+ 
+-	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+-	mem = devm_ioremap_resource(&pdev->dev, regs);
+-	if (IS_ERR(mem)) {
+-		err = PTR_ERR(mem);
+-		goto err_disable_clocks;
+-	}
++	native_io = hw_is_native_io(mem);
+ 
+-	macb_probe_queues(mem, &queue_mask, &num_queues);
++	macb_probe_queues(mem, native_io, &queue_mask, &num_queues);
+ 	dev = alloc_etherdev_mq(sizeof(*bp), num_queues);
+ 	if (!dev) {
+ 		err = -ENOMEM;
+@@ -2831,6 +2872,14 @@ static int macb_probe(struct platform_device *pdev)
+ 	bp->pdev = pdev;
+ 	bp->dev = dev;
+ 	bp->regs = mem;
++	bp->native_io = native_io;
++	if (native_io) {
++		bp->readl = hw_readl_native;
++		bp->writel = hw_writel_native;
++	} else {
++		bp->readl = hw_readl;
++		bp->writel = hw_writel;
++	}
+ 	bp->num_queues = num_queues;
+ 	bp->queue_mask = queue_mask;
+ 	if (macb_config)
+diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
+index d746559..f245340 100644
+--- a/drivers/net/ethernet/cadence/macb.h
++++ b/drivers/net/ethernet/cadence/macb.h
+@@ -429,18 +429,12 @@
+ 	 | GEM_BF(name, value))
+ 
+ /* Register access macros */
+-#define macb_readl(port,reg)				\
+-	readl_relaxed((port)->regs + MACB_##reg)
+-#define macb_writel(port,reg,value)			\
+-	writel_relaxed((value), (port)->regs + MACB_##reg)
+-#define gem_readl(port, reg)				\
+-	readl_relaxed((port)->regs + GEM_##reg)
+-#define gem_writel(port, reg, value)			\
+-	writel_relaxed((value), (port)->regs + GEM_##reg)
+-#define queue_readl(queue, reg)				\
+-	readl_relaxed((queue)->bp->regs + (queue)->reg)
+-#define queue_writel(queue, reg, value)			\
+-	writel_relaxed((value), (queue)->bp->regs + (queue)->reg)
++#define macb_readl(port, reg)		(port)->readl((port), MACB_##reg)
++#define macb_writel(port, reg, value)	(port)->writel((port), MACB_##reg, (value))
++#define gem_readl(port, reg)		(port)->readl((port), GEM_##reg)
++#define gem_writel(port, reg, value)	(port)->writel((port), GEM_##reg, (value))
++#define queue_readl(queue, reg)		(queue)->bp->readl((queue)->bp, (queue)->reg)
++#define queue_writel(queue, reg, value)	(queue)->bp->writel((queue)->bp, (queue)->reg, (value))
+ 
+ /* Conditional GEM/MACB macros.  These perform the operation to the correct
+  * register dependent on whether the device is a GEM or a MACB.  For registers
+@@ -785,6 +779,11 @@ struct macb_queue {
+ 
+ struct macb {
+ 	void __iomem		*regs;
++	bool			native_io;
++
++	/* hardware IO accessors */
++	u32	(*readl)(struct macb *bp, int offset);
++	void	(*writel)(struct macb *bp, int offset, u32 value);
+ 
+ 	unsigned int		rx_tail;
+ 	unsigned int		rx_prepared_head;
+@@ -843,9 +842,4 @@ static inline bool macb_is_gem(struct macb *bp)
+ 	return !!(bp->caps & MACB_CAPS_MACB_IS_GEM);
+ }
+ 
+-static inline bool macb_is_gem_hw(void __iomem *addr)
+-{
+-	return !!(MACB_BFEXT(IDNUM, readl_relaxed(addr + MACB_MID)) >= 0x2);
+-}
+-
+ #endif /* _MACB_H */
+-- 
+1.7.10.4
+