drivers/video/fbdev/valkyriefb.h

Source file repositories/reference/linux-study-clean/drivers/video/fbdev/valkyriefb.h

File Facts

System
Linux kernel
Corpus path
drivers/video/fbdev/valkyriefb.h
Extension
.h
Size
5297 bytes
Lines
197
Domain
Driver Families
Bucket
drivers/video
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct cmap_regs {
	unsigned char addr;
	char pad1[VALKYRIE_REG_PADSIZE];
	unsigned char lut;
};

/*
 * Structure of the registers for the "valkyrie" display adaptor.
 */

struct vpreg {			/* padded register */
	unsigned char r;
	char pad[VALKYRIE_REG_PADSIZE];
};


struct valkyrie_regs {
	struct vpreg mode;
	struct vpreg depth;
	struct vpreg status;
	struct vpreg reg3;
	struct vpreg intr;
	struct vpreg reg5;
	struct vpreg intr_enb;
	struct vpreg msense;
};

/*
 * Register initialization tables for the valkyrie display.
 *
 * Dot clock rate is
 * 3.9064MHz * 2**clock_params[2] * clock_params[1] / clock_params[0].
 */
struct valkyrie_regvals {
	unsigned char mode;
	unsigned char clock_params[3];
	int	pitch[2];		/* bytes/line, indexed by color_mode */
	int	hres;
	int	vres;
};

#ifndef CONFIG_MAC
/* Register values for 1024x768, 75Hz mode (17) */
/* I'm not sure which mode this is (16 or 17), so I'm defining it as 17,
 * since the equivalent mode in controlfb (which I adapted this from) is
 * also 17. Just because MacOS can't do this on Valkyrie doesn't mean we
 * can't! :)
 *
 * I was going to use 12, 31, 3, which I found by myself, but instead I'm
 * using 11, 28, 3 like controlfb, for consistency's sake.
 */

static struct valkyrie_regvals valkyrie_reg_init_17 = {
    15, 
    { 11, 28, 3 },  /* pixel clock = 79.55MHz for V=74.50Hz */
    { 1024, 0 },
	1024, 768
};

/* Register values for 1024x768, 72Hz mode (15) */
/* This used to be 12, 30, 3 for pixel clock = 78.12MHz for V=72.12Hz, but
 * that didn't match MacOS in the same video mode on this chip, and it also
 * caused the 15" Apple Studio Display to not work in this mode. While this
 * mode still doesn't match MacOS exactly (as far as I can tell), it's a lot
 * closer now, and it works with the Apple Studio Display.
 *
 * Yes, even though MacOS calls it "72Hz", in reality it's about 70Hz.
 */
static struct valkyrie_regvals valkyrie_reg_init_15 = {
    15,
    { 12, 29, 3 },  /* pixel clock = 75.52MHz for V=69.71Hz? */
		    /* I interpolated the V=69.71 from the vmode 14 and old 15
		     * numbers. Is this result correct?
		     */
    { 1024, 0 },
	1024, 768
};

/* Register values for 1024x768, 60Hz mode (14) */
static struct valkyrie_regvals valkyrie_reg_init_14 = {
    14,
    { 15, 31, 3 },  /* pixel clock = 64.58MHz for V=59.62Hz */
    { 1024, 0 },
	1024, 768
};
#endif /* !defined CONFIG_MAC */

/* Register values for 832x624, 75Hz mode (13) */
static struct valkyrie_regvals valkyrie_reg_init_13 = {
    9,

Annotation

Implementation Notes