aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/video/s3fb.c
diff options
context:
space:
mode:
authorOndrej Zary <linux@rainbow-software.org>2011-04-18 10:14:57 +0000
committerPaul Mundt <lethal@linux-sh.org>2011-04-19 15:50:53 +0900
commit86c0f043a737dadf034a4e6f29aefb074f4a1146 (patch)
tree4cacb1364fd037a0128b91e8f714335d2332851e /drivers/video/s3fb.c
parent6e4b26805a90b6682dd4ea0fd426dcda8ca5164a (diff)
s3fb: add DDC support
Add I2C support for the DDC bus and also default mode initialization by reading monitor EDID to the s3fb driver. Tested on Trio64V+ (2 cards), Trio64V2/DX, Virge (3 cards), Virge/DX (3 cards), Virge/GX2, Trio3D/2X (4 cards), Trio3D. Will probably not work on Trio32 - my 2 cards have DDC support in BIOS that looks different from the other cards but the DDC pins on the VGA connector are not connected. Signed-off-by: Ondrej Zary <linux@rainbow-software.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video/s3fb.c')
-rw-r--r--drivers/video/s3fb.c206
1 files changed, 201 insertions, 5 deletions
diff --git a/drivers/video/s3fb.c b/drivers/video/s3fb.c
index c4482f2e5799..9a345209535b 100644
--- a/drivers/video/s3fb.c
+++ b/drivers/video/s3fb.c
@@ -25,6 +25,9 @@
#include <linux/console.h> /* Why should fb driver call console functions? because console_lock() */
#include <video/vga.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif
@@ -36,6 +39,12 @@ struct s3fb_info {
struct mutex open_lock;
unsigned int ref_count;
u32 pseudo_palette[16];
+#ifdef CONFIG_FB_S3_DDC
+ u8 __iomem *mmio;
+ bool ddc_registered;
+ struct i2c_adapter ddc_adapter;
+ struct i2c_algo_bit_data ddc_algo;
+#endif
};
@@ -105,6 +114,9 @@ static const char * const s3_names[] = {"S3 Unknown", "S3 Trio32", "S3 Trio64",
#define CHIP_UNDECIDED_FLAG 0x80
#define CHIP_MASK 0xFF
+#define MMIO_OFFSET 0x1000000
+#define MMIO_SIZE 0x10000
+
/* CRT timing register sets */
static const struct vga_regset s3_h_total_regs[] = {{0x00, 0, 7}, {0x5D, 0, 0}, VGA_REGSET_END};
@@ -140,7 +152,7 @@ static const struct svga_timing_regs s3_timing_regs = {
/* Module parameters */
-static char *mode_option __devinitdata = "640x480-8@60";
+static char *mode_option __devinitdata;
#ifdef CONFIG_MTRR
static int mtrr __devinitdata = 1;
@@ -169,6 +181,119 @@ MODULE_PARM_DESC(fasttext, "Enable S3 fast text mode (1=enable, 0=disable, defau
/* ------------------------------------------------------------------------- */
+#ifdef CONFIG_FB_S3_DDC
+
+#define DDC_REG 0xaa /* Trio 3D/1X/2X */
+#define DDC_MMIO_REG 0xff20 /* all other chips */
+#define DDC_SCL_OUT (1 << 0)
+#define DDC_SDA_OUT (1 << 1)
+#define DDC_SCL_IN (1 << 2)
+#define DDC_SDA_IN (1 << 3)
+#define DDC_DRIVE_EN (1 << 4)
+
+static bool s3fb_ddc_needs_mmio(int chip)
+{
+ return !(chip == CHIP_360_TRIO3D_1X ||
+ chip == CHIP_362_TRIO3D_2X ||
+ chip == CHIP_368_TRIO3D_2X);
+}
+
+static u8 s3fb_ddc_read(struct s3fb_info *par)
+{
+ if (s3fb_ddc_needs_mmio(par->chip))
+ return readb(par->mmio + DDC_MMIO_REG);
+ else
+ return vga_rcrt(par->state.vgabase, DDC_REG);
+}
+
+static void s3fb_ddc_write(struct s3fb_info *par, u8 val)
+{
+ if (s3fb_ddc_needs_mmio(par->chip))
+ writeb(val, par->mmio + DDC_MMIO_REG);
+ else
+ vga_wcrt(par->state.vgabase, DDC_REG, val);
+}
+
+static void s3fb_ddc_setscl(void *data, int val)
+{
+ struct s3fb_info *par = data;
+ unsigned char reg;
+
+ reg = s3fb_ddc_read(par) | DDC_DRIVE_EN;
+ if (val)
+ reg |= DDC_SCL_OUT;
+ else
+ reg &= ~DDC_SCL_OUT;
+ s3fb_ddc_write(par, reg);
+}
+
+static void s3fb_ddc_setsda(void *data, int val)
+{
+ struct s3fb_info *par = data;
+ unsigned char reg;
+
+ reg = s3fb_ddc_read(par) | DDC_DRIVE_EN;
+ if (val)
+ reg |= DDC_SDA_OUT;
+ else
+ reg &= ~DDC_SDA_OUT;
+ s3fb_ddc_write(par, reg);
+}
+
+static int s3fb_ddc_getscl(void *data)
+{
+ struct s3fb_info *par = data;
+
+ return !!(s3fb_ddc_read(par) & DDC_SCL_IN);
+}
+
+static int s3fb_ddc_getsda(void *data)
+{
+ struct s3fb_info *par = data;
+
+ return !!(s3fb_ddc_read(par) & DDC_SDA_IN);
+}
+
+static int __devinit s3fb_setup_ddc_bus(struct fb_info *info)
+{
+ struct s3fb_info *par = info->par;
+
+ strlcpy(par->ddc_adapter.name, info->fix.id,
+ sizeof(par->ddc_adapter.name));
+ par->ddc_adapter.owner = THIS_MODULE;
+ par->ddc_adapter.class = I2C_CLASS_DDC;
+ par->ddc_adapter.algo_data = &par->ddc_algo;
+ par->ddc_adapter.dev.parent = info->device;
+ par->ddc_algo.setsda = s3fb_ddc_setsda;
+ par->ddc_algo.setscl = s3fb_ddc_setscl;
+ par->ddc_algo.getsda = s3fb_ddc_getsda;
+ par->ddc_algo.getscl = s3fb_ddc_getscl;
+ par->ddc_algo.udelay = 10;
+ par->ddc_algo.timeout = 20;
+ par->ddc_algo.data = par;
+
+ i2c_set_adapdata(&par->ddc_adapter, par);
+
+ /*
+ * some Virge cards have external MUX to switch chip I2C bus between
+ * DDC and extension pins - switch it do DDC
+ */
+/* vga_wseq(par->state.vgabase, 0x08, 0x06); - not needed, already unlocked */
+ if (par->chip == CHIP_357_VIRGE_GX2 ||
+ par->chip == CHIP_359_VIRGE_GX2P)
+ svga_wseq_mask(par->state.vgabase, 0x0d, 0x01, 0x03);
+ else
+ svga_wseq_mask(par->state.vgabase, 0x0d, 0x00, 0x03);
+ /* some Virge need this or the DDC is ignored */
+ svga_wcrt_mask(par->state.vgabase, 0x5c, 0x03, 0x03);
+
+ return i2c_bit_add_bus(&par->ddc_adapter);
+}
+#endif /* CONFIG_FB_S3_DDC */
+
+
+/* ------------------------------------------------------------------------- */
+
/* Set font in S3 fast text mode */
static void s3fb_settile_fast(struct fb_info *info, struct fb_tilemap *map)
@@ -994,6 +1119,7 @@ static int __devinit s3_pci_probe(struct pci_dev *dev, const struct pci_device_i
struct s3fb_info *par;
int rc;
u8 regval, cr38, cr39;
+ bool found = false;
/* Ignore secondary VGA device because there is no VGA arbitration */
if (! svga_primary_device(dev)) {
@@ -1110,12 +1236,69 @@ static int __devinit s3_pci_probe(struct pci_dev *dev, const struct pci_device_i
info->fix.ypanstep = 0;
info->fix.accel = FB_ACCEL_NONE;
info->pseudo_palette = (void*) (par->pseudo_palette);
+ info->var.bits_per_pixel = 8;
+
+#ifdef CONFIG_FB_S3_DDC
+ /* Enable MMIO if needed */
+ if (s3fb_ddc_needs_mmio(par->chip)) {
+ par->mmio = ioremap(info->fix.smem_start + MMIO_OFFSET, MMIO_SIZE);
+ if (par->mmio)
+ svga_wcrt_mask(par->state.vgabase, 0x53, 0x08, 0x08); /* enable MMIO */
+ else
+ dev_err(info->device, "unable to map MMIO at 0x%lx, disabling DDC",
+ info->fix.smem_start + MMIO_OFFSET);
+ }
+ if (!s3fb_ddc_needs_mmio(par->chip) || par->mmio)
+ if (s3fb_setup_ddc_bus(info) == 0) {
+ u8 *edid = fb_ddc_read(&par->ddc_adapter);
+ par->ddc_registered = true;
+ if (edid) {
+ fb_edid_to_monspecs(edid, &info->monspecs);
+ kfree(edid);
+ if (!info->monspecs.modedb)
+ dev_err(info->device, "error getting mode database\n");
+ else {
+ const struct fb_videomode *m;
+
+ fb_videomode_to_modelist(info->monspecs.modedb,
+ info->monspecs.modedb_len,
+ &info->modelist);
+ m = fb_find_best_display(&info->monspecs, &info->modelist);
+ if (m) {
+ fb_videomode_to_var(&info->var, m);
+ /* fill all other info->var's fields */
+ if (s3fb_check_var(&info->var, info) == 0)
+ found = true;
+ }
+ }
+ }
+ }
+#endif
+ if (!mode_option && !found)
+ mode_option = "640x480-8@60";
/* Prepare startup mode */
- rc = fb_find_mode(&(info->var), info, mode_option, NULL, 0, NULL, 8);
- if (! ((rc == 1) || (rc == 2))) {
- rc = -EINVAL;
- dev_err(info->device, "mode %s not found\n", mode_option);
+ if (mode_option) {
+ rc = fb_find_mode(&info->var, info, mode_option,
+ info->monspecs.modedb, info->monspecs.modedb_len,
+ NULL, info->var.bits_per_pixel);
+ if (!rc || rc == 4) {
+ rc = -EINVAL;
+ dev_err(info->device, "mode %s not found\n", mode_option);
+ fb_destroy_modedb(info->monspecs.modedb);
+ info->monspecs.modedb = NULL;
+ goto err_find_mode;
+ }
+ }
+
+ fb_destroy_modedb(info->monspecs.modedb);
+ info->monspecs.modedb = NULL;
+
+ /* maximize virtual vertical size for fast scrolling */
+ info->var.yres_virtual = info->fix.smem_len * 8 /
+ (info->var.bits_per_pixel * info->var.xres_virtual);
+ if (info->var.yres_virtual < info->var.yres) {
+ dev_err(info->device, "virtual vertical size smaller than real\n");
goto err_find_mode;
}
@@ -1164,6 +1347,12 @@ err_reg_fb:
fb_dealloc_cmap(&info->cmap);
err_alloc_cmap:
err_find_mode:
+#ifdef CONFIG_FB_S3_DDC
+ if (par->ddc_registered)
+ i2c_del_adapter(&par->ddc_adapter);
+ if (par->mmio)
+ iounmap(par->mmio);
+#endif
pci_iounmap(dev, info->screen_base);
err_iomap:
pci_release_regions(dev);
@@ -1195,6 +1384,13 @@ static void __devexit s3_pci_remove(struct pci_dev *dev)
unregister_framebuffer(info);
fb_dealloc_cmap(&info->cmap);
+#ifdef CONFIG_FB_S3_DDC
+ if (par->ddc_registered)
+ i2c_del_adapter(&par->ddc_adapter);
+ if (par->mmio)
+ iounmap(par->mmio);
+#endif
+
pci_iounmap(dev, info->screen_base);
pci_release_regions(dev);
/* pci_disable_device(dev); */

Privacy Policy