#include <linux/fb.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
+#include <linux/delay.h>
#include <video/fbcon.h>
struct fb_info *cfb;
-#define CMAP_SIZE 16
+#define CMAP_MAX_SIZE 16
/* The /proc entry for the backlight. */
static struct proc_dir_entry *clps7111fb_backlight_proc_entry = NULL;
static int clps7111fb_proc_backlight_write(struct file *file,
const char *buffer, unsigned long count, void *data);
+/*
+ * LCD AC Prescale. This comes from the LCD panel manufacturers specifications.
+ * This determines how many clocks + 1 of CL1 before the M signal toggles.
+ * The number of lines on the display must not be divisible by this number.
+ */
+static unsigned int lcd_ac_prescale = 13;
+
/*
* Set a single color register. Return != 0 for invalid regno.
*/
{
unsigned int level, mask, shift, pal;
- if (regno >= CMAP_SIZE)
+ if (regno >= (1 << info->var.bits_per_pixel))
return 1;
/* gray = 0.30*R + 0.58*G + 0.11*B */
if (var->bits_per_pixel > 4)
return -EINVAL;
+
+ return 0;
}
/*
static int
clps7111fb_set_par(struct fb_info *info)
{
- unsigned int lcdcon, syscon;
+ unsigned int lcdcon, syscon, pixclock;
- switch (var->bits_per_pixel) {
+ switch (info->var.bits_per_pixel) {
case 1:
- info->fix.visual = FB_VISUAL_MONO01;
+ info->fix.visual = FB_VISUAL_MONO01;
break;
case 2:
- info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+ info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
case 4:
- info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+ info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
}
info->fix.line_length = info->var.xres_virtual * info->var.bits_per_pixel / 8;
- /*
- * LCDCON must only be changed while the LCD is disabled
- */
lcdcon = (info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel) / 128 - 1;
lcdcon |= ((info->var.xres_virtual / 16) - 1) << 13;
- lcdcon |= 2 << 19;
- lcdcon |= 13 << 25;
- lcdcon |= LCDCON_GSEN;
- lcdcon |= LCDCON_GSMD;
+ lcdcon |= lcd_ac_prescale << 25;
+
+ /*
+ * Calculate pixel prescale value from the pixclock. This is:
+ * 36.864MHz / pixclock_mhz - 1.
+ * However, pixclock is in picoseconds, so this ends up being:
+ * 36864000 * pixclock_ps / 10^12 - 1
+ * and this will overflow the 32-bit math. We perform this as
+ * (9 * 4096000 == 36864000):
+ * pixclock_ps * 9 * (4096000 / 10^12) - 1
+ */
+ pixclock = 9 * info->var.pixclock / 244140 - 1;
+ lcdcon |= pixclock << 19;
+
+ if (info->var.bits_per_pixel == 4)
+ lcdcon |= LCDCON_GSMD;
+ if (info->var.bits_per_pixel >= 2)
+ lcdcon |= LCDCON_GSEN;
+ /*
+ * LCDCON must only be changed while the LCD is disabled
+ */
syscon = clps_readl(SYSCON1);
clps_writel(syscon & ~SYSCON1_LCDEN, SYSCON1);
clps_writel(lcdcon, LCDCON);
{
if (blank) {
if (machine_is_edb7211()) {
- int i;
-
/* Turn off the LCD backlight. */
clps_writeb(clps_readb(PDDR) & ~EDB_PD3_LCDBL, PDDR);
}
} else {
if (machine_is_edb7211()) {
- int i;
-
/* Power up the LCD controller. */
clps_writel(clps_readl(SYSCON1) | SYSCON1_LCDEN,
SYSCON1);
return count;
}
+static void __init clps711x_guess_lcd_params(struct fb_info *info)
+{
+ unsigned int lcdcon, syscon, size;
+ unsigned long phys_base = PAGE_OFFSET;
+ void *virt_base = (void *)PAGE_OFFSET;
+
+ info->var.xres_virtual = 640;
+ info->var.yres_virtual = 240;
+ info->var.bits_per_pixel = 4;
+ info->var.activate = FB_ACTIVATE_NOW;
+ info->var.height = -1;
+ info->var.width = -1;
+ info->var.pixclock = 93006; /* 10.752MHz pixel clock */
+
+ /*
+ * If the LCD controller is already running, decode the values
+ * in LCDCON to xres/yres/bpp/pixclock/acprescale
+ */
+ syscon = clps_readl(SYSCON1);
+ if (syscon & SYSCON1_LCDEN) {
+ lcdcon = clps_readl(LCDCON);
+
+ /*
+ * Decode GSMD and GSEN bits to bits per pixel
+ */
+ switch (lcdcon & (LCDCON_GSMD | LCDCON_GSEN)) {
+ case LCDCON_GSMD | LCDCON_GSEN:
+ info->var.bits_per_pixel = 4;
+ break;
+
+ case LCDCON_GSEN:
+ info->var.bits_per_pixel = 2;
+ break;
+
+ default:
+ info->var.bits_per_pixel = 1;
+ break;
+ }
+
+ /*
+ * Decode xres/yres
+ */
+ info->var.xres_virtual = (((lcdcon >> 13) & 0x3f) + 1) * 16;
+ info->var.yres_virtual = (((lcdcon & 0x1fff) + 1) * 128) /
+ (info->var.xres_virtual *
+ info->var.bits_per_pixel);
+
+ /*
+ * Calculate pixclock
+ */
+ info->var.pixclock = (((lcdcon >> 19) & 0x3f) + 1) * 244140 / 9;
+
+ /*
+ * Grab AC prescale
+ */
+ lcd_ac_prescale = (lcdcon >> 25) & 0x1f;
+ }
+
+ info->var.xres = info->var.xres_virtual;
+ info->var.yres = info->var.yres_virtual;
+ info->var.grayscale = info->var.bits_per_pixel > 1;
+
+ size = info->var.xres * info->var.yres * info->var.bits_per_pixel / 8;
+
+ /*
+ * Might be worth checking to see if we can use the on-board
+ * RAM if size here...
+ * CLPS7110 - no on-board SRAM
+ * EP7212 - 38400 bytes
+ */
+ if (size < 38400) {
+ printk(KERN_INFO "CLPS711xFB: could use on-board SRAM?\n");
+ }
+
+ if ((syscon & SYSCON1_LCDEN) == 0) {
+ /*
+ * The display isn't running. Ensure that
+ * the display memory is empty.
+ */
+ memset(virt_base, 0, size);
+ }
+
+ info->screen_base = virt_base;
+ info->fix.smem_start = phys_base;
+ info->fix.smem_len = PAGE_ALIGN(size);
+ info->fix.type = FB_TYPE_PACKED_PIXELS;
+}
int __init clps711xfb_init(void)
{
goto out;
memset(cfb, 0, sizeof(*cfb) + sizeof(struct display));
- memset((void *)PAGE_OFFSET, 0, 0x14000);
+ strcpy(cfb->fix.id, "clps711x");
cfb->currcon = -1;
-
- strcpy(cfb->fix.id, "clps7111");
- cfb->screen_base = (void *)PAGE_OFFSET;
- cfb->fix.smem_start = PAGE_OFFSET;
- cfb->fix.smem_len = 0x14000;
- cfb->fix.type = FB_TYPE_PACKED_PIXELS;
-
- cfb->var.xres = 640;
- cfb->var.xres_virtual = 640;
- cfb->var.yres = 240;
- cfb->var.yres_virtual = 240;
- cfb->var.bits_per_pixel = 4;
- cfb->var.grayscale = 1;
- cfb->var.activate = FB_ACTIVATE_NOW;
- cfb->var.height = -1;
- cfb->var.width = -1;
-
cfb->fbops = &clps7111fb_ops;
- cfb->changevar = NULL;
- cfb->switch_con = gen_switch;
- cfb->updatevar = gen_update_var;
+ cfb->changevar = NULL;
+ cfb->switch_con = gen_switch;
+ cfb->updatevar = gen_update_var;
cfb->flags = FBINFO_FLAG_DEFAULT;
cfb->disp = (struct display *)(cfb + 1);
- fb_alloc_cmap(&cfb->cmap, CMAP_SIZE, 0);
+ clps711x_guess_lcd_params(cfb);
+
+ fb_alloc_cmap(&cfb->cmap, CMAP_MAX_SIZE, 0);
/* Register the /proc entries. */
clps7111fb_backlight_proc_entry = create_proc_entry("backlight", 0444,
}
if (machine_is_edb7211()) {
- int i;
-
/* Power up the LCD panel. */
clps_writeb(clps_readb(PDDR) | EDB_PD2_LCDEN, PDDR);
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