diff options
| -rw-r--r-- | arch/powerpc/boot/dts/fsl/p1022si-post.dtsi | 6 | ||||
| -rw-r--r-- | arch/powerpc/platforms/85xx/p1022_ds.c | 71 |
2 files changed, 76 insertions, 1 deletions
diff --git a/arch/powerpc/boot/dts/fsl/p1022si-post.dtsi b/arch/powerpc/boot/dts/fsl/p1022si-post.dtsi index de45215..06216b8 100644 --- a/arch/powerpc/boot/dts/fsl/p1022si-post.dtsi +++ b/arch/powerpc/boot/dts/fsl/p1022si-post.dtsi @@ -35,7 +35,11 @@ &lbc { #address-cells = <2>; #size-cells = <1>; - compatible = "fsl,p1022-elbc", "fsl,elbc", "simple-bus"; + /* + * The localbus on the P1022 is not a simple-bus because of the eLBC + * pin muxing when the DIU is enabled. + */ + compatible = "fsl,p1022-elbc", "fsl,elbc"; interrupts = <19 2 0 0>; }; diff --git a/arch/powerpc/platforms/85xx/p1022_ds.c b/arch/powerpc/platforms/85xx/p1022_ds.c index 63ba790..e211b0d 100644 --- a/arch/powerpc/platforms/85xx/p1022_ds.c +++ b/arch/powerpc/platforms/85xx/p1022_ds.c @@ -249,6 +249,49 @@ void __init p1022_ds_pic_init(void) mpic_init(mpic); } +#if defined(CONFIG_FB_FSL_DIU) || defined(CONFIG_FB_FSL_DIU_MODULE) + +/* + * Disables a node in the device tree. + * + * This function is called before kmalloc() is available, so the 'new' object + * should be allocated in the global area. The easiest way is to do that is + * to allocate one static local variable for each call to this function. + */ +static void __init disable_one_node(struct device_node *np, struct property *new) +{ + struct property *old; + + old = of_find_property(np, new->name, NULL); + if (old) + prom_update_property(np, new, old); + else + prom_add_property(np, new); +} + +/* TRUE if there is a "video=fslfb" command-line parameter. */ +static bool fslfb; + +/* + * Search for a "video=fslfb" command-line parameter, and set 'fslfb' to + * true if we find it. + * + * We need to use early_param() instead of __setup() because the normal + * __setup() gets called to late. However, early_param() gets called very + * early, before the device tree is unflattened, so all we can do now is set a + * global variable. Later on, p1022_ds_setup_arch() will use that variable + * to determine if we need to update the device tree. + */ +static int __init early_video_setup(char *options) +{ + fslfb = (strncmp(options, "fslfb:", 6) == 0); + + return 0; +} +early_param("video", early_video_setup); + +#endif + /* * Setup the architecture */ @@ -286,6 +329,34 @@ static void __init p1022_ds_setup_arch(void) diu_ops.set_monitor_port = p1022ds_set_monitor_port; diu_ops.set_pixel_clock = p1022ds_set_pixel_clock; 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. + */ + 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) { + 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); + } + } + + } + #endif mpc85xx_smp_init(); |