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-rw-r--r--drivers/video/vgastate.c490
1 files changed, 490 insertions, 0 deletions
diff --git a/drivers/video/vgastate.c b/drivers/video/vgastate.c
new file mode 100644
index 000000000..122fb3c3e
--- /dev/null
+++ b/drivers/video/vgastate.c
@@ -0,0 +1,490 @@
+/*
+ * linux/drivers/video/vgastate.c -- VGA state save/restore
+ *
+ * Copyright 2002 James Simmons
+ *
+ * Copyright history from vga16fb.c:
+ * Copyright 1999 Ben Pfaff and Petr Vandrovec
+ * Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm
+ * Based on VESA framebuffer (c) 1998 Gerd Knorr
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ */
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/fb.h>
+#include <linux/vmalloc.h>
+#include <video/vga.h>
+
+struct regstate {
+ __u8 *vga_font0;
+ __u8 *vga_font1;
+ __u8 *vga_text;
+ __u8 *vga_cmap;
+ __u8 *attr;
+ __u8 *crtc;
+ __u8 *gfx;
+ __u8 *seq;
+ __u8 misc;
+};
+
+static inline unsigned char vga_rcrtcs(void __iomem *regbase, unsigned short iobase,
+ unsigned char reg)
+{
+ vga_w(regbase, iobase + 0x4, reg);
+ return vga_r(regbase, iobase + 0x5);
+}
+
+static inline void vga_wcrtcs(void __iomem *regbase, unsigned short iobase,
+ unsigned char reg, unsigned char val)
+{
+ vga_w(regbase, iobase + 0x4, reg);
+ vga_w(regbase, iobase + 0x5, val);
+}
+
+static void save_vga_text(struct vgastate *state, void __iomem *fbbase)
+{
+ struct regstate *saved = (struct regstate *) state->vidstate;
+ int i;
+ u8 misc, attr10, gr4, gr5, gr6, seq1, seq2, seq4;
+ unsigned short iobase;
+
+ /* if in graphics mode, no need to save */
+ misc = vga_r(state->vgabase, VGA_MIS_R);
+ iobase = (misc & 1) ? 0x3d0 : 0x3b0;
+
+ vga_r(state->vgabase, iobase + 0xa);
+ vga_w(state->vgabase, VGA_ATT_W, 0x00);
+ attr10 = vga_rattr(state->vgabase, 0x10);
+ vga_r(state->vgabase, iobase + 0xa);
+ vga_w(state->vgabase, VGA_ATT_W, 0x20);
+
+ if (attr10 & 1)
+ return;
+
+ /* save regs */
+ gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ);
+ gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE);
+ gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC);
+ seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE);
+ seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE);
+
+ /* blank screen */
+ seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
+ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5);
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
+
+ /* save font at plane 2 */
+ if (state->flags & VGA_SAVE_FONT0) {
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
+ for (i = 0; i < 4 * 8192; i++)
+ saved->vga_font0[i] = vga_r(fbbase, i);
+ }
+
+ /* save font at plane 3 */
+ if (state->flags & VGA_SAVE_FONT1) {
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
+ for (i = 0; i < state->memsize; i++)
+ saved->vga_font1[i] = vga_r(fbbase, i);
+ }
+
+ /* save font at plane 0/1 */
+ if (state->flags & VGA_SAVE_TEXT) {
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
+ for (i = 0; i < 8192; i++)
+ saved->vga_text[i] = vga_r(fbbase, i);
+
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
+ for (i = 0; i < 8192; i++)
+ saved->vga_text[8192+i] = vga_r(fbbase + 2 * 8192, i);
+ }
+
+ /* restore regs */
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4);
+
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6);
+
+ /* unblank screen */
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
+ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5));
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
+
+ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1);
+}
+
+static void restore_vga_text(struct vgastate *state, void __iomem *fbbase)
+{
+ struct regstate *saved = (struct regstate *) state->vidstate;
+ int i;
+ u8 gr1, gr3, gr4, gr5, gr6, gr8;
+ u8 seq1, seq2, seq4;
+
+ /* save regs */
+ gr1 = vga_rgfx(state->vgabase, VGA_GFX_SR_ENABLE);
+ gr3 = vga_rgfx(state->vgabase, VGA_GFX_DATA_ROTATE);
+ gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ);
+ gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE);
+ gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC);
+ gr8 = vga_rgfx(state->vgabase, VGA_GFX_BIT_MASK);
+ seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE);
+ seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE);
+
+ /* blank screen */
+ seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
+ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5);
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
+
+ if (state->depth == 4) {
+ vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, 0xff);
+ vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, 0x00);
+ }
+
+ /* restore font at plane 2 */
+ if (state->flags & VGA_SAVE_FONT0) {
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
+ for (i = 0; i < 4 * 8192; i++)
+ vga_w(fbbase, i, saved->vga_font0[i]);
+ }
+
+ /* restore font at plane 3 */
+ if (state->flags & VGA_SAVE_FONT1) {
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
+ for (i = 0; i < state->memsize; i++)
+ vga_w(fbbase, i, saved->vga_font1[i]);
+ }
+
+ /* restore font at plane 0/1 */
+ if (state->flags & VGA_SAVE_TEXT) {
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
+ for (i = 0; i < 8192; i++)
+ vga_w(fbbase, i, saved->vga_text[i]);
+
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
+ for (i = 0; i < 8192; i++)
+ vga_w(fbbase, i, saved->vga_text[8192+i]);
+ }
+
+ /* unblank screen */
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
+ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5));
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
+
+ /* restore regs */
+ vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, gr1);
+ vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, gr3);
+ vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4);
+ vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5);
+ vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6);
+ vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, gr8);
+
+ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1);
+ vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2);
+ vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4);
+}
+
+static void save_vga_mode(struct vgastate *state)
+{
+ struct regstate *saved = (struct regstate *) state->vidstate;
+ unsigned short iobase;
+ int i;
+
+ saved->misc = vga_r(state->vgabase, VGA_MIS_R);
+ if (saved->misc & 1)
+ iobase = 0x3d0;
+ else
+ iobase = 0x3b0;
+
+ for (i = 0; i < state->num_crtc; i++)
+ saved->crtc[i] = vga_rcrtcs(state->vgabase, iobase, i);
+
+ vga_r(state->vgabase, iobase + 0xa);
+ vga_w(state->vgabase, VGA_ATT_W, 0x00);
+ for (i = 0; i < state->num_attr; i++) {
+ vga_r(state->vgabase, iobase + 0xa);
+ saved->attr[i] = vga_rattr(state->vgabase, i);
+ }
+ vga_r(state->vgabase, iobase + 0xa);
+ vga_w(state->vgabase, VGA_ATT_W, 0x20);
+
+ for (i = 0; i < state->num_gfx; i++)
+ saved->gfx[i] = vga_rgfx(state->vgabase, i);
+
+ for (i = 0; i < state->num_seq; i++)
+ saved->seq[i] = vga_rseq(state->vgabase, i);
+}
+
+static void restore_vga_mode(struct vgastate *state)
+{
+ struct regstate *saved = (struct regstate *) state->vidstate;
+ unsigned short iobase;
+ int i;
+
+ vga_w(state->vgabase, VGA_MIS_W, saved->misc);
+
+ if (saved->misc & 1)
+ iobase = 0x3d0;
+ else
+ iobase = 0x3b0;
+
+ /* turn off display */
+ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE,
+ saved->seq[VGA_SEQ_CLOCK_MODE] | 0x20);
+
+ /* disable sequencer */
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01);
+
+ /* enable palette addressing */
+ vga_r(state->vgabase, iobase + 0xa);
+ vga_w(state->vgabase, VGA_ATT_W, 0x00);
+
+ for (i = 2; i < state->num_seq; i++)
+ vga_wseq(state->vgabase, i, saved->seq[i]);
+
+
+ /* unprotect vga regs */
+ vga_wcrtcs(state->vgabase, iobase, 17, saved->crtc[17] & ~0x80);
+ for (i = 0; i < state->num_crtc; i++)
+ vga_wcrtcs(state->vgabase, iobase, i, saved->crtc[i]);
+
+ for (i = 0; i < state->num_gfx; i++)
+ vga_wgfx(state->vgabase, i, saved->gfx[i]);
+
+ for (i = 0; i < state->num_attr; i++) {
+ vga_r(state->vgabase, iobase + 0xa);
+ vga_wattr(state->vgabase, i, saved->attr[i]);
+ }
+
+ /* reenable sequencer */
+ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
+ /* turn display on */
+ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE,
+ saved->seq[VGA_SEQ_CLOCK_MODE] & ~(1 << 5));
+
+ /* disable video/palette source */
+ vga_r(state->vgabase, iobase + 0xa);
+ vga_w(state->vgabase, VGA_ATT_W, 0x20);
+}
+
+static void save_vga_cmap(struct vgastate *state)
+{
+ struct regstate *saved = (struct regstate *) state->vidstate;
+ int i;
+
+ vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
+
+ /* assumes DAC is readable and writable */
+ vga_w(state->vgabase, VGA_PEL_IR, 0x00);
+ for (i = 0; i < 768; i++)
+ saved->vga_cmap[i] = vga_r(state->vgabase, VGA_PEL_D);
+}
+
+static void restore_vga_cmap(struct vgastate *state)
+{
+ struct regstate *saved = (struct regstate *) state->vidstate;
+ int i;
+
+ vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
+
+ /* assumes DAC is readable and writable */
+ vga_w(state->vgabase, VGA_PEL_IW, 0x00);
+ for (i = 0; i < 768; i++)
+ vga_w(state->vgabase, VGA_PEL_D, saved->vga_cmap[i]);
+}
+
+static void vga_cleanup(struct vgastate *state)
+{
+ if (state->vidstate != NULL) {
+ struct regstate *saved = (struct regstate *) state->vidstate;
+
+ vfree(saved->vga_font0);
+ vfree(saved->vga_font1);
+ vfree(saved->vga_text);
+ vfree(saved->vga_cmap);
+ vfree(saved->attr);
+ kfree(saved);
+ state->vidstate = NULL;
+ }
+}
+
+int save_vga(struct vgastate *state)
+{
+ struct regstate *saved;
+
+ saved = kzalloc(sizeof(struct regstate), GFP_KERNEL);
+
+ if (saved == NULL)
+ return 1;
+
+ state->vidstate = (void *)saved;
+
+ if (state->flags & VGA_SAVE_CMAP) {
+ saved->vga_cmap = vmalloc(768);
+ if (!saved->vga_cmap) {
+ vga_cleanup(state);
+ return 1;
+ }
+ save_vga_cmap(state);
+ }
+
+ if (state->flags & VGA_SAVE_MODE) {
+ int total;
+
+ if (state->num_attr < 21)
+ state->num_attr = 21;
+ if (state->num_crtc < 25)
+ state->num_crtc = 25;
+ if (state->num_gfx < 9)
+ state->num_gfx = 9;
+ if (state->num_seq < 5)
+ state->num_seq = 5;
+ total = state->num_attr + state->num_crtc +
+ state->num_gfx + state->num_seq;
+
+ saved->attr = vmalloc(total);
+ if (!saved->attr) {
+ vga_cleanup(state);
+ return 1;
+ }
+ saved->crtc = saved->attr + state->num_attr;
+ saved->gfx = saved->crtc + state->num_crtc;
+ saved->seq = saved->gfx + state->num_gfx;
+
+ save_vga_mode(state);
+ }
+
+ if (state->flags & VGA_SAVE_FONTS) {
+ void __iomem *fbbase;
+
+ /* exit if window is less than 32K */
+ if (state->memsize && state->memsize < 4 * 8192) {
+ vga_cleanup(state);
+ return 1;
+ }
+ if (!state->memsize)
+ state->memsize = 8 * 8192;
+
+ if (!state->membase)
+ state->membase = 0xA0000;
+
+ fbbase = ioremap(state->membase, state->memsize);
+
+ if (!fbbase) {
+ vga_cleanup(state);
+ return 1;
+ }
+
+ /*
+ * save only first 32K used by vgacon
+ */
+ if (state->flags & VGA_SAVE_FONT0) {
+ saved->vga_font0 = vmalloc(4 * 8192);
+ if (!saved->vga_font0) {
+ iounmap(fbbase);
+ vga_cleanup(state);
+ return 1;
+ }
+ }
+ /*
+ * largely unused, but if required by the caller
+ * we'll just save everything.
+ */
+ if (state->flags & VGA_SAVE_FONT1) {
+ saved->vga_font1 = vmalloc(state->memsize);
+ if (!saved->vga_font1) {
+ iounmap(fbbase);
+ vga_cleanup(state);
+ return 1;
+ }
+ }
+ /*
+ * Save 8K at plane0[0], and 8K at plane1[16K]
+ */
+ if (state->flags & VGA_SAVE_TEXT) {
+ saved->vga_text = vmalloc(8192 * 2);
+ if (!saved->vga_text) {
+ iounmap(fbbase);
+ vga_cleanup(state);
+ return 1;
+ }
+ }
+
+ save_vga_text(state, fbbase);
+ iounmap(fbbase);
+ }
+ return 0;
+}
+
+int restore_vga(struct vgastate *state)
+{
+ if (state->vidstate == NULL)
+ return 1;
+
+ if (state->flags & VGA_SAVE_MODE)
+ restore_vga_mode(state);
+
+ if (state->flags & VGA_SAVE_FONTS) {
+ void __iomem *fbbase = ioremap(state->membase, state->memsize);
+
+ if (!fbbase) {
+ vga_cleanup(state);
+ return 1;
+ }
+ restore_vga_text(state, fbbase);
+ iounmap(fbbase);
+ }
+
+ if (state->flags & VGA_SAVE_CMAP)
+ restore_vga_cmap(state);
+
+ vga_cleanup(state);
+ return 0;
+}
+
+EXPORT_SYMBOL(save_vga);
+EXPORT_SYMBOL(restore_vga);
+
+MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
+MODULE_DESCRIPTION("VGA State Save/Restore");
+MODULE_LICENSE("GPL");
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 12:35:16 +0000