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| author | sonic zhang <sonic.adi@gmail.com> | 2007-11-27 12:47:39 +0800 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-12-01 17:35:58 -0500 |
| commit | f88c480dac88a754f84e943cb5539d59cda3c089 (patch) | |
| tree | 5c2485dcab759849ecfda80d2f6b0fdc93c983b1 /drivers/ata/pata_bf54x.c | |
| parent | 92d499d991ec4f5cbd00d6f33967eab9d3ee8d6c (diff) | |
| download | linux-f88c480dac88a754f84e943cb5539d59cda3c089.tar.bz2 | |
Set proper ATA UDMA mode for bf548 according to system clock.
UDMA Mode - Frequency compatibility
UDMA5 - 100 MB/s - SCLK = 133 MHz
UDMA4 - 66 MB/s - SCLK >= 80 MHz
UDMA3 - 44.4 MB/s - SCLK >= 50 MHz
UDMA2 - 33 MB/s - SCLK >= 40 MHz
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/pata_bf54x.c')
| -rw-r--r-- | drivers/ata/pata_bf54x.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/ata/pata_bf54x.c b/drivers/ata/pata_bf54x.c index 81db405a5445..088a41f4e656 100644 --- a/drivers/ata/pata_bf54x.c +++ b/drivers/ata/pata_bf54x.c @@ -1489,6 +1489,8 @@ static int __devinit bfin_atapi_probe(struct platform_device *pdev) int board_idx = 0; struct resource *res; struct ata_host *host; + unsigned int fsclk = get_sclk(); + int udma_mode = 5; const struct ata_port_info *ppi[] = { &bfin_port_info[board_idx], NULL }; @@ -1507,6 +1509,11 @@ static int __devinit bfin_atapi_probe(struct platform_device *pdev) if (res == NULL) return -EINVAL; + while (bfin_port_info[board_idx].udma_mask>0 && udma_fsclk[udma_mode] > fsclk) { + udma_mode--; + bfin_port_info[board_idx].udma_mask >>= 1; + } + /* * Now that that's out of the way, wire up the port.. */ |