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net: bcmgenet: Use correct I/O accessors
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The GENET driver currently uses __raw_{read,write}l which means
native I/O endian. This works correctly for an ARM LE kernel (default)
but fails miserably on an ARM BE (BE8) kernel where registers are kept
little endian, so replace uses with {read,write}l_relaxed here which is
what we want because this is all performance sensitive code.

Signed-off-by: Florian Fainelli <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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@ffainelli @davem330
ffainelli authored and davem330 committed Aug 29, 2017
1 parent b6eb9d5 commit 69d2ea9
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Showing 2 changed files with 58 additions and 30 deletions.
75 changes: 47 additions & 28 deletions drivers/net/ethernet/broadcom/genet/bcmgenet.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -72,31 +72,50 @@
#define GENET_RDMA_REG_OFF (priv->hw_params->rdma_offset + \
TOTAL_DESC * DMA_DESC_SIZE)

static inline void bcmgenet_writel(u32 value, void __iomem *offset)
{
/* MIPS chips strapped for BE will automagically configure the
* peripheral registers for CPU-native byte order.
*/
if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
__raw_writel(value, offset);
else
writel_relaxed(value, offset);
}

static inline u32 bcmgenet_readl(void __iomem *offset)
{
if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
return __raw_readl(offset);
else
return readl_relaxed(offset);
}

static inline void dmadesc_set_length_status(struct bcmgenet_priv *priv,
void __iomem *d, u32 value)
{
__raw_writel(value, d + DMA_DESC_LENGTH_STATUS);
bcmgenet_writel(value, d + DMA_DESC_LENGTH_STATUS);
}

static inline u32 dmadesc_get_length_status(struct bcmgenet_priv *priv,
void __iomem *d)
{
return __raw_readl(d + DMA_DESC_LENGTH_STATUS);
return bcmgenet_readl(d + DMA_DESC_LENGTH_STATUS);
}

static inline void dmadesc_set_addr(struct bcmgenet_priv *priv,
void __iomem *d,
dma_addr_t addr)
{
__raw_writel(lower_32_bits(addr), d + DMA_DESC_ADDRESS_LO);
bcmgenet_writel(lower_32_bits(addr), d + DMA_DESC_ADDRESS_LO);

/* Register writes to GISB bus can take couple hundred nanoseconds
* and are done for each packet, save these expensive writes unless
* the platform is explicitly configured for 64-bits/LPAE.
*/
#ifdef CONFIG_PHYS_ADDR_T_64BIT
if (priv->hw_params->flags & GENET_HAS_40BITS)
__raw_writel(upper_32_bits(addr), d + DMA_DESC_ADDRESS_HI);
bcmgenet_writel(upper_32_bits(addr), d + DMA_DESC_ADDRESS_HI);
#endif
}

Expand All @@ -113,15 +132,15 @@ static inline dma_addr_t dmadesc_get_addr(struct bcmgenet_priv *priv,
{
dma_addr_t addr;

addr = __raw_readl(d + DMA_DESC_ADDRESS_LO);
addr = bcmgenet_readl(d + DMA_DESC_ADDRESS_LO);

/* Register writes to GISB bus can take couple hundred nanoseconds
* and are done for each packet, save these expensive writes unless
* the platform is explicitly configured for 64-bits/LPAE.
*/
#ifdef CONFIG_PHYS_ADDR_T_64BIT
if (priv->hw_params->flags & GENET_HAS_40BITS)
addr |= (u64)__raw_readl(d + DMA_DESC_ADDRESS_HI) << 32;
addr |= (u64)bcmgenet_readl(d + DMA_DESC_ADDRESS_HI) << 32;
#endif
return addr;
}
Expand Down Expand Up @@ -156,16 +175,16 @@ static inline u32 bcmgenet_tbuf_ctrl_get(struct bcmgenet_priv *priv)
if (GENET_IS_V1(priv))
return bcmgenet_rbuf_readl(priv, TBUF_CTRL_V1);
else
return __raw_readl(priv->base +
priv->hw_params->tbuf_offset + TBUF_CTRL);
return bcmgenet_readl(priv->base +
priv->hw_params->tbuf_offset + TBUF_CTRL);
}

static inline void bcmgenet_tbuf_ctrl_set(struct bcmgenet_priv *priv, u32 val)
{
if (GENET_IS_V1(priv))
bcmgenet_rbuf_writel(priv, val, TBUF_CTRL_V1);
else
__raw_writel(val, priv->base +
bcmgenet_writel(val, priv->base +
priv->hw_params->tbuf_offset + TBUF_CTRL);
}

Expand All @@ -174,16 +193,16 @@ static inline u32 bcmgenet_bp_mc_get(struct bcmgenet_priv *priv)
if (GENET_IS_V1(priv))
return bcmgenet_rbuf_readl(priv, TBUF_BP_MC_V1);
else
return __raw_readl(priv->base +
priv->hw_params->tbuf_offset + TBUF_BP_MC);
return bcmgenet_readl(priv->base +
priv->hw_params->tbuf_offset + TBUF_BP_MC);
}

static inline void bcmgenet_bp_mc_set(struct bcmgenet_priv *priv, u32 val)
{
if (GENET_IS_V1(priv))
bcmgenet_rbuf_writel(priv, val, TBUF_BP_MC_V1);
else
__raw_writel(val, priv->base +
bcmgenet_writel(val, priv->base +
priv->hw_params->tbuf_offset + TBUF_BP_MC);
}

Expand Down Expand Up @@ -326,28 +345,28 @@ static inline struct bcmgenet_priv *dev_to_priv(struct device *dev)
static inline u32 bcmgenet_tdma_readl(struct bcmgenet_priv *priv,
enum dma_reg r)
{
return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
return bcmgenet_readl(priv->base + GENET_TDMA_REG_OFF +
DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
}

static inline void bcmgenet_tdma_writel(struct bcmgenet_priv *priv,
u32 val, enum dma_reg r)
{
__raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
bcmgenet_writel(val, priv->base + GENET_TDMA_REG_OFF +
DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
}

static inline u32 bcmgenet_rdma_readl(struct bcmgenet_priv *priv,
enum dma_reg r)
{
return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
return bcmgenet_readl(priv->base + GENET_RDMA_REG_OFF +
DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
}

static inline void bcmgenet_rdma_writel(struct bcmgenet_priv *priv,
u32 val, enum dma_reg r)
{
__raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
bcmgenet_writel(val, priv->base + GENET_RDMA_REG_OFF +
DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
}

Expand Down Expand Up @@ -418,16 +437,16 @@ static inline u32 bcmgenet_tdma_ring_readl(struct bcmgenet_priv *priv,
unsigned int ring,
enum dma_ring_reg r)
{
return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
(DMA_RING_SIZE * ring) +
genet_dma_ring_regs[r]);
return bcmgenet_readl(priv->base + GENET_TDMA_REG_OFF +
(DMA_RING_SIZE * ring) +
genet_dma_ring_regs[r]);
}

static inline void bcmgenet_tdma_ring_writel(struct bcmgenet_priv *priv,
unsigned int ring, u32 val,
enum dma_ring_reg r)
{
__raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
bcmgenet_writel(val, priv->base + GENET_TDMA_REG_OFF +
(DMA_RING_SIZE * ring) +
genet_dma_ring_regs[r]);
}
Expand All @@ -436,16 +455,16 @@ static inline u32 bcmgenet_rdma_ring_readl(struct bcmgenet_priv *priv,
unsigned int ring,
enum dma_ring_reg r)
{
return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
(DMA_RING_SIZE * ring) +
genet_dma_ring_regs[r]);
return bcmgenet_readl(priv->base + GENET_RDMA_REG_OFF +
(DMA_RING_SIZE * ring) +
genet_dma_ring_regs[r]);
}

static inline void bcmgenet_rdma_ring_writel(struct bcmgenet_priv *priv,
unsigned int ring, u32 val,
enum dma_ring_reg r)
{
__raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
bcmgenet_writel(val, priv->base + GENET_RDMA_REG_OFF +
(DMA_RING_SIZE * ring) +
genet_dma_ring_regs[r]);
}
Expand Down Expand Up @@ -991,12 +1010,12 @@ static void bcmgenet_eee_enable_set(struct net_device *dev, bool enable)
bcmgenet_umac_writel(priv, reg, UMAC_EEE_CTRL);

/* Enable EEE and switch to a 27Mhz clock automatically */
reg = __raw_readl(priv->base + off);
reg = bcmgenet_readl(priv->base + off);
if (enable)
reg |= TBUF_EEE_EN | TBUF_PM_EN;
else
reg &= ~(TBUF_EEE_EN | TBUF_PM_EN);
__raw_writel(reg, priv->base + off);
bcmgenet_writel(reg, priv->base + off);

/* Do the same for thing for RBUF */
reg = bcmgenet_rbuf_readl(priv, RBUF_ENERGY_CTRL);
Expand Down
13 changes: 11 additions & 2 deletions drivers/net/ethernet/broadcom/genet/bcmgenet.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -672,12 +672,21 @@ struct bcmgenet_priv {
static inline u32 bcmgenet_##name##_readl(struct bcmgenet_priv *priv, \
u32 off) \
{ \
return __raw_readl(priv->base + offset + off); \
/* MIPS chips strapped for BE will automagically configure the \
* peripheral registers for CPU-native byte order. \
*/ \
if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) \
return __raw_readl(priv->base + offset + off); \
else \
return readl_relaxed(priv->base + offset + off); \
} \
static inline void bcmgenet_##name##_writel(struct bcmgenet_priv *priv, \
u32 val, u32 off) \
{ \
__raw_writel(val, priv->base + offset + off); \
if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) \
return __raw_writel(val, priv->base + offset + off); \
else \
writel_relaxed(val, priv->base + offset + off); \
}

GENET_IO_MACRO(ext, GENET_EXT_OFF);
Expand Down

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