SATA: do not auto-initialize during boot

Rather than have the board code initialize SATA automatically during boot,
make the user manually run "sata init".  This brings the SATA subsystem in
line with common U-Boot policy.

Rather than having a dedicated weak function "is_sata_supported", people
can override sata_initialize() to do their weird board stuff.  Then they
can call the actual __sata_initialize().

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

board/freescale/mpc8536ds/mpc8536ds.c

@@ -582,15 +582,15 @@ get_board_ddr_clk(ulong dummy)
 }
 #endif
 
-int is_sata_supported(void)
+int sata_initialize(void)
 {
 	volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
 	uint sdrs2_io_sel =
 		(gur->pordevsr & MPC85xx_PORDEVSR_SRDS2_IO_SEL) >> 27;
 	if (sdrs2_io_sel & 0x04)
-		return 0;
-
 		return 1;
+
+	return __sata_initialize();
 }
 
 int board_eth_init(bd_t *bis)

common/cmd_sata.c

@@ -31,7 +31,7 @@
 int curr_device = -1;
 block_dev_desc_t sata_dev_desc[CONFIG_SYS_SATA_MAX_DEVICE];
 
-int sata_initialize(void)
+int __sata_initialize(void)
 {
 	int rc;
 	int i;
@@ -55,6 +55,7 @@ int sata_initialize(void)
 	curr_device = 0;
 	return rc;
 }
+int sata_initialize(void) __attribute__((weak,alias("__sata_initialize")));
 
 block_dev_desc_t *sata_get_dev(int dev)
 {
@@ -65,6 +66,14 @@ int do_sata(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
 	int rc = 0;
 
+	if (argc == 2 && strcmp(argv[1], "init") == 0)
+		return sata_initialize();
+
+	/* If the user has not yet run `sata init`, do it now */
+	if (curr_device == -1)
+		if (sata_initialize())
+			return 1;
+
 	switch (argc) {
 	case 0:
 	case 1:
@@ -186,6 +195,7 @@ int do_sata(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 U_BOOT_CMD(
 	sata, 5, 1, do_sata,
 	"sata	- SATA sub system\n",
+	"init - init SATA sub system\n"
 	"sata info - show available SATA devices\n"
 	"sata device [dev] - show or set current device\n"
 	"sata part [dev] - print partition table\n"

include/sata.h

@@ -7,5 +7,6 @@ ulong sata_read(int dev, ulong blknr, ulong blkcnt, void *buffer);
 ulong sata_write(int dev, ulong blknr, ulong blkcnt, const void *buffer);
 
 int sata_initialize(void);
+int __sata_initialize(void);
 
 #endif

lib_ppc/board.c

@@ -38,9 +38,6 @@
 #if defined(CONFIG_CMD_IDE)
 #include <ide.h>
 #endif
-#if defined(CONFIG_CMD_SATA)
-#include <sata.h>
-#endif
 #if defined(CONFIG_CMD_SCSI)
 #include <scsi.h>
 #endif
@@ -639,16 +636,6 @@ void board_init_f (ulong bootflag)
 	/* NOTREACHED - relocate_code() does not return */
 }
 
-int __is_sata_supported(void)
-{
-	/* For some boards, when sata disabled by the switch, and the
-	 * driver still access the sata registers, the cpu will hangup.
-	 * please define platform specific is_sata_supported() if your
-	 * board have such issue.*/
-	return 1;
-}
-int is_sata_supported(void) __attribute__((weak, alias("__is_sata_supported")));
-
 /************************************************************************
  *
  * This is the next part if the initialization sequence: we are now
@@ -1152,13 +1139,6 @@ void board_init_r (gd_t *id, ulong dest_addr)
 #endif
 #endif
 
-#if defined(CONFIG_CMD_SATA)
-	if (is_sata_supported()) {
-		puts("SATA:  ");
-		sata_initialize();
-	}
-#endif
-
 #ifdef CONFIG_LAST_STAGE_INIT
 	WATCHDOG_RESET ();
 	/*