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amd-xgbe: Base AXI DMA cache settings on device tree

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The default cache operations for ARM64 were changed during 3.15.
To use coherent operations a "dma-coherent" device tree property
is required.  If that property is not present in the device tree
node then the non-coherent operations are assigned for the device.

Add support to the amd-xgbe driver to assign the AXI DMA cache settings
based on whether the "dma-coherent" property is present in the device
node.  If present, use settings that work with the caches.  If not
present, use settings that do not look at the caches.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas 2014-07-02 13:04:57 -05:00 committed by David S. Miller
parent 9867e8fb2c
commit cfa50c7811
3 changed files with 37 additions and 18 deletions
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28
drivers/net/ethernet/amd/xgbe/xgbe-dev.c
View File

@ -1455,23 +1455,23 @@ static void xgbe_config_dma_cache(struct xgbe_prv_data *pdata)
unsigned int arcache, awcache;
arcache = 0;
XGMAC_SET_BITS(arcache, DMA_AXIARCR, DRC, XGBE_DMA_ARCACHE);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, DRD, XGBE_DMA_ARDOMAIN);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, TEC, XGBE_DMA_ARCACHE);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, TED, XGBE_DMA_ARDOMAIN);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, THC, XGBE_DMA_ARCACHE);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, THD, XGBE_DMA_ARDOMAIN);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, DRC, pdata->arcache);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, DRD, pdata->axdomain);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, TEC, pdata->arcache);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, TED, pdata->axdomain);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, THC, pdata->arcache);
XGMAC_SET_BITS(arcache, DMA_AXIARCR, THD, pdata->axdomain);
XGMAC_IOWRITE(pdata, DMA_AXIARCR, arcache);
awcache = 0;
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, DWC, XGBE_DMA_AWCACHE);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, DWD, XGBE_DMA_AWDOMAIN);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, RPC, XGBE_DMA_AWCACHE);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, RPD, XGBE_DMA_AWDOMAIN);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, RHC, XGBE_DMA_AWCACHE);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, RHD, XGBE_DMA_AWDOMAIN);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, TDC, XGBE_DMA_AWCACHE);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, TDD, XGBE_DMA_AWDOMAIN);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, DWC, pdata->awcache);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, DWD, pdata->axdomain);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, RPC, pdata->awcache);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, RPD, pdata->axdomain);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, RHC, pdata->awcache);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, RHD, pdata->axdomain);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, TDC, pdata->awcache);
XGMAC_SET_BITS(awcache, DMA_AXIAWCR, TDD, pdata->axdomain);
XGMAC_IOWRITE(pdata, DMA_AXIAWCR, awcache);
}

10
drivers/net/ethernet/amd/xgbe/xgbe-main.c
View File

@ -297,6 +297,16 @@ static int xgbe_probe(struct platform_device *pdev)
*(dev->dma_mask) = DMA_BIT_MASK(40);
dev->coherent_dma_mask = DMA_BIT_MASK(40);
if (of_property_read_bool(dev->of_node, "dma-coherent")) {
pdata->axdomain = XGBE_DMA_OS_AXDOMAIN;
pdata->arcache = XGBE_DMA_OS_ARCACHE;
pdata->awcache = XGBE_DMA_OS_AWCACHE;
} else {
pdata->axdomain = XGBE_DMA_SYS_AXDOMAIN;
pdata->arcache = XGBE_DMA_SYS_ARCACHE;
pdata->awcache = XGBE_DMA_SYS_AWCACHE;
}
ret = platform_get_irq(pdev, 0);
if (ret < 0) {
dev_err(dev, "platform_get_irq failed\n");

17
drivers/net/ethernet/amd/xgbe/xgbe.h
View File

@ -143,10 +143,14 @@
#define XGBE_MAX_DMA_CHANNELS 16
/* DMA cache settings - Outer sharable, write-back, write-allocate */
#define XGBE_DMA_ARDOMAIN 0x2
#define XGBE_DMA_ARCACHE 0xb
#define XGBE_DMA_AWDOMAIN 0x2
#define XGBE_DMA_AWCACHE 0xf
#define XGBE_DMA_OS_AXDOMAIN 0x2
#define XGBE_DMA_OS_ARCACHE 0xb
#define XGBE_DMA_OS_AWCACHE 0xf
/* DMA cache settings - System, no caches used */
#define XGBE_DMA_SYS_AXDOMAIN 0x3
#define XGBE_DMA_SYS_ARCACHE 0x0
#define XGBE_DMA_SYS_AWCACHE 0x0
#define XGBE_DMA_INTERRUPT_MASK 0x31c7
@ -536,6 +540,11 @@ struct xgbe_prv_data {
struct xgbe_hw_if hw_if;
struct xgbe_desc_if desc_if;
/* AXI DMA settings */
unsigned int axdomain;
unsigned int arcache;
unsigned int awcache;
/* Rings for Tx/Rx on a DMA channel */
struct xgbe_channel *channel;
unsigned int channel_count;