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authorTaylor Hutt <thutt@chromium.org>2012-10-29 05:23:59 +0000
committerTom Rini <trini@ti.com>2012-11-02 15:20:42 -0700
commit90b276f6a2a9e197eadce297fd593d85397bc430 (patch)
tree6f336b2cc5bc16f9312ef15a86eb1af5b6ead516 /drivers
parent64738e8ae89214030061f62d6598e837664916c3 (diff)
downloadu-boot-linaro-stable-90b276f6a2a9e197eadce297fd593d85397bc430.tar.gz
ahci: flush / invalidate dcache around SATA commands
Exynos5 automatically performs DMA when the SATA controller executes commands. This adds the necessary dcache-to-memory flush & invalidation calls to allow the DMA to properly function. Signed-off-by: Taylor Hutt <thutt@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/ahci.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/block/ahci.c b/drivers/block/ahci.c
index 00de0868a..a05d9cfd7 100644
--- a/drivers/block/ahci.c
+++ b/drivers/block/ahci.c
@@ -70,6 +70,39 @@ static void ahci_setup_port(struct ahci_ioports *port, unsigned long base,
#define msleep(a) udelay(a * 1000)
+static void ahci_dcache_flush_range(unsigned begin, unsigned len)
+{
+ const unsigned long start = begin;
+ const unsigned long end = start + len;
+
+ debug("%s: flush dcache: [%#lx, %#lx)\n", __func__, start, end);
+ flush_dcache_range(start, end);
+}
+
+/*
+ * SATA controller DMAs to physical RAM. Ensure data from the
+ * controller is invalidated from dcache; next access comes from
+ * physical RAM.
+ */
+static void ahci_dcache_invalidate_range(unsigned begin, unsigned len)
+{
+ const unsigned long start = begin;
+ const unsigned long end = start + len;
+
+ debug("%s: invalidate dcache: [%#lx, %#lx)\n", __func__, start, end);
+ invalidate_dcache_range(start, end);
+}
+
+/*
+ * Ensure data for SATA controller is flushed out of dcache and
+ * written to physical memory.
+ */
+static void ahci_dcache_flush_sata_cmd(struct ahci_ioports *pp)
+{
+ ahci_dcache_flush_range((unsigned long)pp->cmd_slot,
+ AHCI_PORT_PRIV_DMA_SZ);
+}
+
static int waiting_for_cmd_completed(volatile u8 *offset,
int timeout_msec,
u32 sign)
@@ -392,6 +425,7 @@ static void ahci_set_feature(u8 port)
memcpy((unsigned char *)pp->cmd_tbl, fis, sizeof(fis));
ahci_fill_cmd_slot(pp, cmd_fis_len);
+ ahci_dcache_flush_sata_cmd(pp);
writel(1, port_mmio + PORT_CMD_ISSUE);
readl(port_mmio + PORT_CMD_ISSUE);
@@ -496,12 +530,17 @@ static int ahci_device_data_io(u8 port, u8 *fis, int fis_len, u8 *buf,
opts = (fis_len >> 2) | (sg_count << 16) | (is_write << 6);
ahci_fill_cmd_slot(pp, opts);
+ ahci_dcache_flush_sata_cmd(pp);
+ ahci_dcache_flush_range((unsigned)buf, (unsigned)buf_len);
+
writel_with_flush(1, port_mmio + PORT_CMD_ISSUE);
if (waiting_for_cmd_completed(port_mmio + PORT_CMD_ISSUE, 150, 0x1)) {
printf("timeout exit!\n");
return -1;
}
+
+ ahci_dcache_invalidate_range((unsigned)buf, (unsigned)buf_len);
debug("%s: %d byte transferred.\n", __func__, pp->cmd_slot->status);
return 0;