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authorTimur Tabi <timur@freescale.com>2012-07-13 14:28:42 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-02 10:30:37 -0700
commite85f60c9fc3d5ecc66e6598c0e487aa5c4b7feeb (patch)
treec06136af613eae207b7bb31afda7260cf44c533a
parent3dcb53637949c288a1ff2a06ee3c0a212ace6ef1 (diff)
powerpc/85xx: p1022ds: disable the NAND flash node if video is enabled
commit 6269f2584a359766f53005c676daff8aee60cbed upstream. The Freescale P1022 has a unique pin muxing "feature" where the DIU video controller's video signals are muxed with 24 of the local bus address signals. When the DIU is enabled, the bulk of the local bus is disabled, preventing access to memory-mapped devices like NAND flash and the pixis FPGA. Therefore, if the DIU is going to be enabled, then memory-mapped devices on the localbus, like NAND flash, need to be disabled. This patch is similar to "powerpc/85xx: p1022ds: disable the NOR flash node if video is enabled", except that it disables the NAND flash node instead. This PIXIS node needs to remain enabled because it is used by platform code to switch into indirect mode. Signed-off-by: Timur Tabi <timur@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/powerpc/platforms/85xx/p1022_ds.c38
1 files changed, 29 insertions, 9 deletions
diff --git a/arch/powerpc/platforms/85xx/p1022_ds.c b/arch/powerpc/platforms/85xx/p1022_ds.c
index 978330ccdde6..f867ae42fae5 100644
--- a/arch/powerpc/platforms/85xx/p1022_ds.c
+++ b/arch/powerpc/platforms/85xx/p1022_ds.c
@@ -435,6 +435,8 @@ static void __init disable_one_node(struct device_node *np, struct property *new
prom_update_property(np, new, old);
else
prom_add_property(np, new);
+
+ pr_info("p1022ds: disabling %s node\n", np->full_name);
}
/* TRUE if there is a "video=fslfb" command-line parameter. */
@@ -499,28 +501,46 @@ static void __init p1022_ds_setup_arch(void)
diu_ops.valid_monitor_port = p1022ds_valid_monitor_port;
/*
- * Disable the NOR flash node if there is video=fslfb... command-line
- * parameter. When the DIU is active, NOR flash is unavailable, so we
- * have to disable the node before the MTD driver loads.
+ * Disable the NOR and NAND flash nodes if there is video=fslfb...
+ * command-line parameter. When the DIU is active, the localbus is
+ * unavailable, so we have to disable these nodes before the MTD
+ * driver loads.
*/
if (fslfb) {
struct device_node *np =
of_find_compatible_node(NULL, NULL, "fsl,p1022-elbc");
if (np) {
- np = of_find_compatible_node(np, NULL, "cfi-flash");
- if (np) {
+ struct device_node *np2;
+
+ of_node_get(np);
+ np2 = of_find_compatible_node(np, NULL, "cfi-flash");
+ if (np2) {
static struct property nor_status = {
.name = "status",
.value = "disabled",
.length = sizeof("disabled"),
};
- pr_info("p1022ds: disabling %s node",
- np->full_name);
- disable_one_node(np, &nor_status);
- of_node_put(np);
+ disable_one_node(np2, &nor_status);
+ of_node_put(np2);
+ }
+
+ of_node_get(np);
+ np2 = of_find_compatible_node(np, NULL,
+ "fsl,elbc-fcm-nand");
+ if (np2) {
+ static struct property nand_status = {
+ .name = "status",
+ .value = "disabled",
+ .length = sizeof("disabled"),
+ };
+
+ disable_one_node(np2, &nand_status);
+ of_node_put(np2);
}
+
+ of_node_put(np);
}
}