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ata: ahci allow 64-bit DMA for SATA 

Allow 64-bit DMA on AHCI. If not supported by the host controller, at
least print a message and fail.

Signed-off-by: Roman Kapl <rka@sysgo.com>
This commit is contained in:
Roman Kapl 2019-10-14 11:21:09 +02:00 committed by Tom Rini
parent 34856b0f1c
commit 6e7325533b
1 changed files with 11 additions and 3 deletions
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14
drivers/ata/ahci.c
View File

@ -50,6 +50,8 @@ struct ahci_uc_priv *probe_ent = NULL;
#define WAIT_MS_FLUSH 5000
#define WAIT_MS_LINKUP 200
#define AHCI_CAP_S64A BIT(31)
__weak void __iomem *ahci_port_base(void __iomem *base, u32 port)
{
return base + 0x100 + (port * 0x80);
@ -503,9 +505,15 @@ static int ahci_fill_sg(struct ahci_uc_priv *uc_priv, u8 port,
}
for (i = 0; i < sg_count; i++) {
ahci_sg->addr =
cpu_to_le32((unsigned long) buf + i * MAX_DATA_BYTE_COUNT);
ahci_sg->addr_hi = 0;
/* We assume virt=phys */
phys_addr_t pa = (unsigned long)buf + i * MAX_DATA_BYTE_COUNT;
ahci_sg->addr = cpu_to_le32(lower_32_bits(pa));
ahci_sg->addr_hi = cpu_to_le32(upper_32_bits(pa));
if (ahci_sg->addr_hi && !(uc_priv->cap & AHCI_CAP_S64A)) {
printf("Error: DMA address too high\n");
return -1;
}
ahci_sg->flags_size = cpu_to_le32(0x3fffff &
(buf_len < MAX_DATA_BYTE_COUNT
? (buf_len - 1)