ARM: Orion: Set eth packet size csum offload limit

commit 58569aee5a1a5dcc25c34a0a2ed9a377874e6b05 upstream.

The mv643xx ethernet controller limits the packet size for the TX
checksum offloading. This patch sets this limits for Kirkwood and
Dove which have smaller limits that the default.

As a side note, this patch is an updated version of a patch sent some years
ago: http://lists.infradead.org/pipermail/linux-arm-kernel/2010-June/017320.html
which seems to have been lost.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
[bwh: Backported to 3.2: adjust for the extra two parameters of
 orion_ge0{0,1}_init()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

7 files changed, 21 insertions, 10 deletions

diff --git a/arch/arm/mach-dove/common.c b/arch/arm/mach-dove/common.c
index 1620b154fd5..cb105bf8d39 100644
--- a/arch/arm/mach-dove/common.c
+++ b/arch/arm/mach-dove/common.c
@@ -92,7 +92,7 @@ void __init dove_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge00_init(eth_data, &dove_mbus_dram_info,
 			DOVE_GE00_PHYS_BASE, IRQ_DOVE_GE00_SUM,
-			0, get_tclk());
+			0, get_tclk(), 1600);
 }
 
 /*****************************************************************************
diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index c5dbbb35e0b..06faa97ddf1 100644
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -88,7 +88,7 @@ void __init kirkwood_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 
 	orion_ge00_init(eth_data, &kirkwood_mbus_dram_info,
 			GE00_PHYS_BASE, IRQ_KIRKWOOD_GE00_SUM,
-			IRQ_KIRKWOOD_GE00_ERR, kirkwood_tclk);
+			IRQ_KIRKWOOD_GE00_ERR, kirkwood_tclk, 1600);
 }
 
 
@@ -102,7 +102,7 @@ void __init kirkwood_ge01_init(struct mv643xx_eth_platform_data *eth_data)
 
 	orion_ge01_init(eth_data, &kirkwood_mbus_dram_info,
 			GE01_PHYS_BASE, IRQ_KIRKWOOD_GE01_SUM,
-			IRQ_KIRKWOOD_GE01_ERR, kirkwood_tclk);
+			IRQ_KIRKWOOD_GE01_ERR, kirkwood_tclk, 1600);
 }
 
 
diff --git a/arch/arm/mach-mv78xx0/common.c b/arch/arm/mach-mv78xx0/common.c
index d90e244e05e..570ee4d09b0 100644
--- a/arch/arm/mach-mv78xx0/common.c
+++ b/arch/arm/mach-mv78xx0/common.c
@@ -202,7 +202,8 @@ void __init mv78xx0_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge00_init(eth_data, &mv78xx0_mbus_dram_info,
 			GE00_PHYS_BASE, IRQ_MV78XX0_GE00_SUM,
-			IRQ_MV78XX0_GE_ERR, get_tclk());
+			IRQ_MV78XX0_GE_ERR, get_tclk(),
+			MV643XX_TX_CSUM_DEFAULT_LIMIT);
 }
 
 
@@ -213,7 +214,8 @@ void __init mv78xx0_ge01_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge01_init(eth_data, &mv78xx0_mbus_dram_info,
 			GE01_PHYS_BASE, IRQ_MV78XX0_GE01_SUM,
-			NO_IRQ, get_tclk());
+			NO_IRQ, get_tclk(),
+			MV643XX_TX_CSUM_DEFAULT_LIMIT);
 }
 
 
diff --git a/arch/arm/mach-orion5x/common.c b/arch/arm/mach-orion5x/common.c
index 53b68b8f518..20260dbaa8a 100644
--- a/arch/arm/mach-orion5x/common.c
+++ b/arch/arm/mach-orion5x/common.c
@@ -95,7 +95,8 @@ void __init orion5x_eth_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge00_init(eth_data, &orion5x_mbus_dram_info,
 			ORION5X_ETH_PHYS_BASE, IRQ_ORION5X_ETH_SUM,
-			IRQ_ORION5X_ETH_ERR, orion5x_tclk);
+			IRQ_ORION5X_ETH_ERR, orion5x_tclk,
+			MV643XX_TX_CSUM_DEFAULT_LIMIT);
 }
 
 
diff --git a/arch/arm/plat-orion/common.c b/arch/arm/plat-orion/common.c
index 11dce87c248..8a6886aad26 100644
--- a/arch/arm/plat-orion/common.c
+++ b/arch/arm/plat-orion/common.c
@@ -263,10 +263,12 @@ void __init orion_ge00_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
 			    unsigned long irq_err,
-			    int tclk)
+			    int tclk,
+			    unsigned int tx_csum_limit)
 {
 	fill_resources(&orion_ge00_shared, orion_ge00_shared_resources,
 		       mapbase + 0x2000, SZ_16K - 1, irq_err);
+	orion_ge00_shared_data.tx_csum_limit = tx_csum_limit;
 	ge_complete(&orion_ge00_shared_data, mbus_dram_info, tclk,
 		    orion_ge00_resources, irq, &orion_ge00_shared,
 		    eth_data, &orion_ge00);
@@ -317,10 +319,12 @@ void __init orion_ge01_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
 			    unsigned long irq_err,
-			    int tclk)
+			    int tclk,
+			    unsigned int tx_csum_limit)
 {
 	fill_resources(&orion_ge01_shared, orion_ge01_shared_resources,
 		       mapbase + 0x2000, SZ_16K - 1, irq_err);
+	orion_ge01_shared_data.tx_csum_limit = tx_csum_limit;
 	ge_complete(&orion_ge01_shared_data, mbus_dram_info, tclk,
 		    orion_ge01_resources, irq, &orion_ge01_shared,
 		    eth_data, &orion_ge01);
diff --git a/arch/arm/plat-orion/include/plat/common.h b/arch/arm/plat-orion/include/plat/common.h
index a2c0e31ce0d..b637daef9b8 100644
--- a/arch/arm/plat-orion/include/plat/common.h
+++ b/arch/arm/plat-orion/include/plat/common.h
@@ -41,14 +41,16 @@ void __init orion_ge00_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
 			    unsigned long irq_err,
-			    int tclk);
+			    int tclk,
+			    unsigned int tx_csum_limit);
 
 void __init orion_ge01_init(struct mv643xx_eth_platform_data *eth_data,
 			    struct mbus_dram_target_info *mbus_dram_info,
 			    unsigned long mapbase,
 			    unsigned long irq,
 			    unsigned long irq_err,
-			    int tclk);
+			    int tclk,
+			    unsigned int tx_csum_limit);
 
 void __init orion_ge10_init(struct mv643xx_eth_platform_data *eth_data,
 			    struct mbus_dram_target_info *mbus_dram_info,
diff --git a/include/linux/mv643xx_eth.h b/include/linux/mv643xx_eth.h
index 30b0c4e78f9..43e038a1a03 100644
--- a/include/linux/mv643xx_eth.h
+++ b/include/linux/mv643xx_eth.h
@@ -15,6 +15,8 @@
 #define MV643XX_ETH_SIZE_REG_4		0x2224
 #define MV643XX_ETH_BASE_ADDR_ENABLE_REG	0x2290
 
+#define MV643XX_TX_CSUM_DEFAULT_LIMIT	0
+
 struct mv643xx_eth_shared_platform_data {
 	struct mbus_dram_target_info	*dram;
 	struct platform_device	*shared_smi;