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authorSteven A. Falco <sfalco@harris.com>2008-08-15 15:34:10 -0400
committerWolfgang Denk <wd@denx.de>2008-08-21 01:31:04 +0200
commit36c2d3062ecc6ab85f8e237180eb134464c48418 (patch)
tree67cfe217e923dab6797979aaffe39d4756dfd6ab /common/cmd_ide.c
parent9571b84cb1423876f1153081b9e6a51d90fbcdc4 (diff)
Add a hook to allow board-specific PIO mode setting.
This patch adds a hook whereby a board-specific routine can be called to configure hardware for a PIO mode. The prototype for the board-specific routine is: int inline ide_set_piomode(int pio_mode) ide_set_piomode should be prepared to configure hardware for a pio_mode between 0 and 6, inclusive. It should return 0 on success or 1 on failure. Signed-off-by: Steven A. Falco <sfalco@harris.com>
Diffstat (limited to 'common/cmd_ide.c')
-rw-r--r--common/cmd_ide.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/common/cmd_ide.c b/common/cmd_ide.c
index d6ba79f7040..069100700a8 100644
--- a/common/cmd_ide.c
+++ b/common/cmd_ide.c
@@ -543,6 +543,16 @@ __ide_inb(int dev, int port)
unsigned char inline ide_inb(int dev, int port)
__attribute__((weak, alias("__ide_inb")));
+#ifdef CONFIG_TUNE_PIO
+int inline
+__ide_set_piomode(int pio_mode)
+{
+ return 0;
+}
+int inline ide_set_piomode(int pio_mode)
+ __attribute__((weak, alias("__ide_set_piomode")));
+#endif
+
void ide_init (void)
{
@@ -1053,6 +1063,10 @@ static void ide_ident (block_dev_desc_t *dev_desc)
int do_retry = 0;
#endif
+#ifdef CONFIG_TUNE_PIO
+ int pio_mode;
+#endif
+
#if 0
int mode, cycle_time;
#endif
@@ -1168,6 +1182,38 @@ static void ide_ident (block_dev_desc_t *dev_desc)
else
dev_desc->removable = 0;
+#ifdef CONFIG_TUNE_PIO
+ /* Mode 0 - 2 only, are directly determined by word 51. */
+ pio_mode = iop->tPIO;
+ if (pio_mode > 2) {
+ printf("WARNING: Invalid PIO (word 51 = %d).\n", pio_mode);
+ pio_mode = 0; /* Force it to dead slow, and hope for the best... */
+ }
+
+ /* Any CompactFlash Storage Card that supports PIO mode 3 or above
+ * shall set bit 1 of word 53 to one and support the fields contained
+ * in words 64 through 70.
+ */
+ if (iop->field_valid & 0x02) {
+ /* Mode 3 and above are possible. Check in order from slow
+ * to fast, so we wind up with the highest mode allowed.
+ */
+ if (iop->eide_pio_modes & 0x01)
+ pio_mode = 3;
+ if (iop->eide_pio_modes & 0x02)
+ pio_mode = 4;
+ if (ata_id_is_cfa((u16 *)iop)) {
+ if ((iop->cf_advanced_caps & 0x07) == 0x01)
+ pio_mode = 5;
+ if ((iop->cf_advanced_caps & 0x07) == 0x02)
+ pio_mode = 6;
+ }
+ }
+
+ /* System-specific, depends on bus speeds, etc. */
+ ide_set_piomode(pio_mode);
+#endif /* CONFIG_TUNE_PIO */
+
#if 0
/*
* Drive PIO mode autoselection