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path: root/drivers/video/fbdev/controlfb.c
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Diffstat (limited to 'drivers/video/fbdev/controlfb.c')
-rw-r--r--drivers/video/fbdev/controlfb.c1084
1 files changed, 1084 insertions, 0 deletions
diff --git a/drivers/video/fbdev/controlfb.c b/drivers/video/fbdev/controlfb.c
new file mode 100644
index 00000000000..fdadef97923
--- /dev/null
+++ b/drivers/video/fbdev/controlfb.c
@@ -0,0 +1,1084 @@
+/*
+ * controlfb.c -- frame buffer device for the PowerMac 'control' display
+ *
+ * Created 12 July 1998 by Dan Jacobowitz <dan@debian.org>
+ * Copyright (C) 1998 Dan Jacobowitz
+ * Copyright (C) 2001 Takashi Oe
+ *
+ * Mmap code by Michel Lanners <mlan@cpu.lu>
+ *
+ * Frame buffer structure from:
+ * drivers/video/chipsfb.c -- frame buffer device for
+ * Chips & Technologies 65550 chip.
+ *
+ * Copyright (C) 1998 Paul Mackerras
+ *
+ * This file is derived from the Powermac "chips" driver:
+ * Copyright (C) 1997 Fabio Riccardi.
+ * And from the frame buffer device for Open Firmware-initialized devices:
+ * Copyright (C) 1997 Geert Uytterhoeven.
+ *
+ * Hardware information from:
+ * control.c: Console support for PowerMac "control" display adaptor.
+ * Copyright (C) 1996 Paul Mackerras
+ *
+ * Updated to 2.5 framebuffer API by Ben Herrenschmidt
+ * <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>,
+ * and James Simmons <jsimmons@infradead.org>.
+ *
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/nvram.h>
+#include <linux/adb.h>
+#include <linux/cuda.h>
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/pgtable.h>
+#include <asm/btext.h>
+
+#include "macmodes.h"
+#include "controlfb.h"
+
+struct fb_par_control {
+ int vmode, cmode;
+ int xres, yres;
+ int vxres, vyres;
+ int xoffset, yoffset;
+ int pitch;
+ struct control_regvals regvals;
+ unsigned long sync;
+ unsigned char ctrl;
+};
+
+#define DIRTY(z) ((x)->z != (y)->z)
+#define DIRTY_CMAP(z) (memcmp(&((x)->z), &((y)->z), sizeof((y)->z)))
+static inline int PAR_EQUAL(struct fb_par_control *x, struct fb_par_control *y)
+{
+ int i, results;
+
+ results = 1;
+ for (i = 0; i < 3; i++)
+ results &= !DIRTY(regvals.clock_params[i]);
+ if (!results)
+ return 0;
+ for (i = 0; i < 16; i++)
+ results &= !DIRTY(regvals.regs[i]);
+ if (!results)
+ return 0;
+ return (!DIRTY(cmode) && !DIRTY(xres) && !DIRTY(yres)
+ && !DIRTY(vxres) && !DIRTY(vyres));
+}
+static inline int VAR_MATCH(struct fb_var_screeninfo *x, struct fb_var_screeninfo *y)
+{
+ return (!DIRTY(bits_per_pixel) && !DIRTY(xres)
+ && !DIRTY(yres) && !DIRTY(xres_virtual)
+ && !DIRTY(yres_virtual)
+ && !DIRTY_CMAP(red) && !DIRTY_CMAP(green) && !DIRTY_CMAP(blue));
+}
+
+struct fb_info_control {
+ struct fb_info info;
+ struct fb_par_control par;
+ u32 pseudo_palette[16];
+
+ struct cmap_regs __iomem *cmap_regs;
+ unsigned long cmap_regs_phys;
+
+ struct control_regs __iomem *control_regs;
+ unsigned long control_regs_phys;
+ unsigned long control_regs_size;
+
+ __u8 __iomem *frame_buffer;
+ unsigned long frame_buffer_phys;
+ unsigned long fb_orig_base;
+ unsigned long fb_orig_size;
+
+ int control_use_bank2;
+ unsigned long total_vram;
+ unsigned char vram_attr;
+};
+
+/* control register access macro */
+#define CNTRL_REG(INFO,REG) (&(((INFO)->control_regs->REG).r))
+
+
+/******************** Prototypes for exported functions ********************/
+/*
+ * struct fb_ops
+ */
+static int controlfb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info);
+static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int transp, struct fb_info *info);
+static int controlfb_blank(int blank_mode, struct fb_info *info);
+static int controlfb_mmap(struct fb_info *info,
+ struct vm_area_struct *vma);
+static int controlfb_set_par (struct fb_info *info);
+static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info);
+
+/******************** Prototypes for internal functions **********************/
+
+static void set_control_clock(unsigned char *params);
+static int init_control(struct fb_info_control *p);
+static void control_set_hardware(struct fb_info_control *p,
+ struct fb_par_control *par);
+static int control_of_init(struct device_node *dp);
+static void find_vram_size(struct fb_info_control *p);
+static int read_control_sense(struct fb_info_control *p);
+static int calc_clock_params(unsigned long clk, unsigned char *param);
+static int control_var_to_par(struct fb_var_screeninfo *var,
+ struct fb_par_control *par, const struct fb_info *fb_info);
+static inline void control_par_to_var(struct fb_par_control *par,
+ struct fb_var_screeninfo *var);
+static void control_init_info(struct fb_info *info, struct fb_info_control *p);
+static void control_cleanup(void);
+
+
+/************************** Internal variables *******************************/
+
+static struct fb_info_control *control_fb;
+
+static int default_vmode __initdata = VMODE_NVRAM;
+static int default_cmode __initdata = CMODE_NVRAM;
+
+
+static struct fb_ops controlfb_ops = {
+ .owner = THIS_MODULE,
+ .fb_check_var = controlfb_check_var,
+ .fb_set_par = controlfb_set_par,
+ .fb_setcolreg = controlfb_setcolreg,
+ .fb_pan_display = controlfb_pan_display,
+ .fb_blank = controlfb_blank,
+ .fb_mmap = controlfb_mmap,
+ .fb_fillrect = cfb_fillrect,
+ .fb_copyarea = cfb_copyarea,
+ .fb_imageblit = cfb_imageblit,
+};
+
+
+/******************** The functions for controlfb_ops ********************/
+
+#ifdef MODULE
+MODULE_LICENSE("GPL");
+
+int init_module(void)
+{
+ struct device_node *dp;
+ int ret = -ENXIO;
+
+ dp = of_find_node_by_name(NULL, "control");
+ if (dp != 0 && !control_of_init(dp))
+ ret = 0;
+ of_node_put(dp);
+
+ return ret;
+}
+
+void cleanup_module(void)
+{
+ control_cleanup();
+}
+#endif
+
+/*
+ * Checks a var structure
+ */
+static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)
+{
+ struct fb_par_control par;
+ int err;
+
+ err = control_var_to_par(var, &par, info);
+ if (err)
+ return err;
+ control_par_to_var(&par, var);
+
+ return 0;
+}
+
+/*
+ * Applies current var to display
+ */
+static int controlfb_set_par (struct fb_info *info)
+{
+ struct fb_info_control *p = (struct fb_info_control *) info;
+ struct fb_par_control par;
+ int err;
+
+ if((err = control_var_to_par(&info->var, &par, info))) {
+ printk (KERN_ERR "controlfb_set_par: error calling"
+ " control_var_to_par: %d.\n", err);
+ return err;
+ }
+
+ control_set_hardware(p, &par);
+
+ info->fix.visual = (p->par.cmode == CMODE_8) ?
+ FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
+ info->fix.line_length = p->par.pitch;
+ info->fix.xpanstep = 32 >> p->par.cmode;
+ info->fix.ypanstep = 1;
+
+ return 0;
+}
+
+/*
+ * Set screen start address according to var offset values
+ */
+static inline void set_screen_start(int xoffset, int yoffset,
+ struct fb_info_control *p)
+{
+ struct fb_par_control *par = &p->par;
+
+ par->xoffset = xoffset;
+ par->yoffset = yoffset;
+ out_le32(CNTRL_REG(p,start_addr),
+ par->yoffset * par->pitch + (par->xoffset << par->cmode));
+}
+
+
+static int controlfb_pan_display(struct fb_var_screeninfo *var,
+ struct fb_info *info)
+{
+ unsigned int xoffset, hstep;
+ struct fb_info_control *p = (struct fb_info_control *)info;
+ struct fb_par_control *par = &p->par;
+
+ /*
+ * make sure start addr will be 32-byte aligned
+ */
+ hstep = 0x1f >> par->cmode;
+ xoffset = (var->xoffset + hstep) & ~hstep;
+
+ if (xoffset+par->xres > par->vxres ||
+ var->yoffset+par->yres > par->vyres)
+ return -EINVAL;
+
+ set_screen_start(xoffset, var->yoffset, p);
+
+ return 0;
+}
+
+
+/*
+ * Private mmap since we want to have a different caching on the framebuffer
+ * for controlfb.
+ * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.
+ */
+static int controlfb_mmap(struct fb_info *info,
+ struct vm_area_struct *vma)
+{
+ unsigned long mmio_pgoff;
+ unsigned long start;
+ u32 len;
+
+ start = info->fix.smem_start;
+ len = info->fix.smem_len;
+ mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
+ if (vma->vm_pgoff >= mmio_pgoff) {
+ if (info->var.accel_flags)
+ return -EINVAL;
+ vma->vm_pgoff -= mmio_pgoff;
+ start = info->fix.mmio_start;
+ len = info->fix.mmio_len;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ } else {
+ /* framebuffer */
+ vma->vm_page_prot = pgprot_cached_wthru(vma->vm_page_prot);
+ }
+
+ return vm_iomap_memory(vma, start, len);
+}
+
+static int controlfb_blank(int blank_mode, struct fb_info *info)
+{
+ struct fb_info_control *p = (struct fb_info_control *) info;
+ unsigned ctrl;
+
+ ctrl = ld_le32(CNTRL_REG(p,ctrl));
+ if (blank_mode > 0)
+ switch (blank_mode) {
+ case FB_BLANK_VSYNC_SUSPEND:
+ ctrl &= ~3;
+ break;
+ case FB_BLANK_HSYNC_SUSPEND:
+ ctrl &= ~0x30;
+ break;
+ case FB_BLANK_POWERDOWN:
+ ctrl &= ~0x33;
+ /* fall through */
+ case FB_BLANK_NORMAL:
+ ctrl |= 0x400;
+ break;
+ default:
+ break;
+ }
+ else {
+ ctrl &= ~0x400;
+ ctrl |= 0x33;
+ }
+ out_le32(CNTRL_REG(p,ctrl), ctrl);
+
+ return 0;
+}
+
+static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+ u_int transp, struct fb_info *info)
+{
+ struct fb_info_control *p = (struct fb_info_control *) info;
+ __u8 r, g, b;
+
+ if (regno > 255)
+ return 1;
+
+ r = red >> 8;
+ g = green >> 8;
+ b = blue >> 8;
+
+ out_8(&p->cmap_regs->addr, regno); /* tell clut what addr to fill */
+ out_8(&p->cmap_regs->lut, r); /* send one color channel at */
+ out_8(&p->cmap_regs->lut, g); /* a time... */
+ out_8(&p->cmap_regs->lut, b);
+
+ if (regno < 16) {
+ int i;
+ switch (p->par.cmode) {
+ case CMODE_16:
+ p->pseudo_palette[regno] =
+ (regno << 10) | (regno << 5) | regno;
+ break;
+ case CMODE_32:
+ i = (regno << 8) | regno;
+ p->pseudo_palette[regno] = (i << 16) | i;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+
+/******************** End of controlfb_ops implementation ******************/
+
+
+
+static void set_control_clock(unsigned char *params)
+{
+#ifdef CONFIG_ADB_CUDA
+ struct adb_request req;
+ int i;
+
+ for (i = 0; i < 3; ++i) {
+ cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
+ 0x50, i + 1, params[i]);
+ while (!req.complete)
+ cuda_poll();
+ }
+#endif
+}
+
+
+/*
+ * finish off the driver initialization and register
+ */
+static int __init init_control(struct fb_info_control *p)
+{
+ int full, sense, vmode, cmode, vyres;
+ struct fb_var_screeninfo var;
+ int rc;
+
+ printk(KERN_INFO "controlfb: ");
+
+ full = p->total_vram == 0x400000;
+
+ /* Try to pick a video mode out of NVRAM if we have one. */
+#ifdef CONFIG_NVRAM
+ if (default_cmode == CMODE_NVRAM) {
+ cmode = nvram_read_byte(NV_CMODE);
+ if(cmode < CMODE_8 || cmode > CMODE_32)
+ cmode = CMODE_8;
+ } else
+#endif
+ cmode=default_cmode;
+#ifdef CONFIG_NVRAM
+ if (default_vmode == VMODE_NVRAM) {
+ vmode = nvram_read_byte(NV_VMODE);
+ if (vmode < 1 || vmode > VMODE_MAX ||
+ control_mac_modes[vmode - 1].m[full] < cmode) {
+ sense = read_control_sense(p);
+ printk("Monitor sense value = 0x%x, ", sense);
+ vmode = mac_map_monitor_sense(sense);
+ if (control_mac_modes[vmode - 1].m[full] < cmode)
+ vmode = VMODE_640_480_60;
+ }
+ } else
+#endif
+ {
+ vmode=default_vmode;
+ if (control_mac_modes[vmode - 1].m[full] < cmode) {
+ if (cmode > CMODE_8)
+ cmode--;
+ else
+ vmode = VMODE_640_480_60;
+ }
+ }
+
+ /* Initialize info structure */
+ control_init_info(&p->info, p);
+
+ /* Setup default var */
+ if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
+ /* This shouldn't happen! */
+ printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
+try_again:
+ vmode = VMODE_640_480_60;
+ cmode = CMODE_8;
+ if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
+ printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
+ return -ENXIO;
+ }
+ printk(KERN_INFO "controlfb: ");
+ }
+ printk("using video mode %d and color mode %d.\n", vmode, cmode);
+
+ vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
+ if (vyres > var.yres)
+ var.yres_virtual = vyres;
+
+ /* Apply default var */
+ var.activate = FB_ACTIVATE_NOW;
+ rc = fb_set_var(&p->info, &var);
+ if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
+ goto try_again;
+
+ /* Register with fbdev layer */
+ if (register_framebuffer(&p->info) < 0)
+ return -ENXIO;
+
+ fb_info(&p->info, "control display adapter\n");
+
+ return 0;
+}
+
+#define RADACAL_WRITE(a,d) \
+ out_8(&p->cmap_regs->addr, (a)); \
+ out_8(&p->cmap_regs->dat, (d))
+
+/* Now how about actually saying, Make it so! */
+/* Some things in here probably don't need to be done each time. */
+static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
+{
+ struct control_regvals *r;
+ volatile struct preg __iomem *rp;
+ int i, cmode;
+
+ if (PAR_EQUAL(&p->par, par)) {
+ /*
+ * check if only xoffset or yoffset differs.
+ * this prevents flickers in typical VT switch case.
+ */
+ if (p->par.xoffset != par->xoffset ||
+ p->par.yoffset != par->yoffset)
+ set_screen_start(par->xoffset, par->yoffset, p);
+
+ return;
+ }
+
+ p->par = *par;
+ cmode = p->par.cmode;
+ r = &par->regvals;
+
+ /* Turn off display */
+ out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
+
+ set_control_clock(r->clock_params);
+
+ RADACAL_WRITE(0x20, r->radacal_ctrl);
+ RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
+ RADACAL_WRITE(0x10, 0);
+ RADACAL_WRITE(0x11, 0);
+
+ rp = &p->control_regs->vswin;
+ for (i = 0; i < 16; ++i, ++rp)
+ out_le32(&rp->r, r->regs[i]);
+
+ out_le32(CNTRL_REG(p,pitch), par->pitch);
+ out_le32(CNTRL_REG(p,mode), r->mode);
+ out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
+ out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
+ + (par->xoffset << cmode));
+ out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
+ out_le32(CNTRL_REG(p,intr_ena), 0);
+
+ /* Turn on display */
+ out_le32(CNTRL_REG(p,ctrl), par->ctrl);
+
+#ifdef CONFIG_BOOTX_TEXT
+ btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
+ p->par.xres, p->par.yres,
+ (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
+ p->par.pitch);
+#endif /* CONFIG_BOOTX_TEXT */
+}
+
+
+/*
+ * Parse user specified options (`video=controlfb:')
+ */
+static void __init control_setup(char *options)
+{
+ char *this_opt;
+
+ if (!options || !*options)
+ return;
+
+ while ((this_opt = strsep(&options, ",")) != NULL) {
+ if (!strncmp(this_opt, "vmode:", 6)) {
+ int vmode = simple_strtoul(this_opt+6, NULL, 0);
+ if (vmode > 0 && vmode <= VMODE_MAX &&
+ control_mac_modes[vmode - 1].m[1] >= 0)
+ default_vmode = vmode;
+ } else if (!strncmp(this_opt, "cmode:", 6)) {
+ int depth = simple_strtoul(this_opt+6, NULL, 0);
+ switch (depth) {
+ case CMODE_8:
+ case CMODE_16:
+ case CMODE_32:
+ default_cmode = depth;
+ break;
+ case 8:
+ default_cmode = CMODE_8;
+ break;
+ case 15:
+ case 16:
+ default_cmode = CMODE_16;
+ break;
+ case 24:
+ case 32:
+ default_cmode = CMODE_32;
+ break;
+ }
+ }
+ }
+}
+
+static int __init control_init(void)
+{
+ struct device_node *dp;
+ char *option = NULL;
+ int ret = -ENXIO;
+
+ if (fb_get_options("controlfb", &option))
+ return -ENODEV;
+ control_setup(option);
+
+ dp = of_find_node_by_name(NULL, "control");
+ if (dp != 0 && !control_of_init(dp))
+ ret = 0;
+ of_node_put(dp);
+
+ return ret;
+}
+
+module_init(control_init);
+
+/* Work out which banks of VRAM we have installed. */
+/* danj: I guess the card just ignores writes to nonexistant VRAM... */
+
+static void __init find_vram_size(struct fb_info_control *p)
+{
+ int bank1, bank2;
+
+ /*
+ * Set VRAM in 2MB (bank 1) mode
+ * VRAM Bank 2 will be accessible through offset 0x600000 if present
+ * and VRAM Bank 1 will not respond at that offset even if present
+ */
+ out_le32(CNTRL_REG(p,vram_attr), 0x31);
+
+ out_8(&p->frame_buffer[0x600000], 0xb3);
+ out_8(&p->frame_buffer[0x600001], 0x71);
+ asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])
+ : "memory" );
+ mb();
+ asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])
+ : "memory" );
+ mb();
+
+ bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
+ && (in_8(&p->frame_buffer[0x600001]) == 0x71);
+
+ /*
+ * Set VRAM in 2MB (bank 2) mode
+ * VRAM Bank 1 will be accessible through offset 0x000000 if present
+ * and VRAM Bank 2 will not respond at that offset even if present
+ */
+ out_le32(CNTRL_REG(p,vram_attr), 0x39);
+
+ out_8(&p->frame_buffer[0], 0x5a);
+ out_8(&p->frame_buffer[1], 0xc7);
+ asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])
+ : "memory" );
+ mb();
+ asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])
+ : "memory" );
+ mb();
+
+ bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
+ && (in_8(&p->frame_buffer[1]) == 0xc7);
+
+ if (bank2) {
+ if (!bank1) {
+ /*
+ * vram bank 2 only
+ */
+ p->control_use_bank2 = 1;
+ p->vram_attr = 0x39;
+ p->frame_buffer += 0x600000;
+ p->frame_buffer_phys += 0x600000;
+ } else {
+ /*
+ * 4 MB vram
+ */
+ p->vram_attr = 0x51;
+ }
+ } else {
+ /*
+ * vram bank 1 only
+ */
+ p->vram_attr = 0x31;
+ }
+
+ p->total_vram = (bank1 + bank2) * 0x200000;
+
+ printk(KERN_INFO "controlfb: VRAM Total = %dMB "
+ "(%dMB @ bank 1, %dMB @ bank 2)\n",
+ (bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
+}
+
+
+/*
+ * find "control" and initialize
+ */
+static int __init control_of_init(struct device_node *dp)
+{
+ struct fb_info_control *p;
+ struct resource fb_res, reg_res;
+
+ if (control_fb) {
+ printk(KERN_ERR "controlfb: only one control is supported\n");
+ return -ENXIO;
+ }
+
+ if (of_pci_address_to_resource(dp, 2, &fb_res) ||
+ of_pci_address_to_resource(dp, 1, &reg_res)) {
+ printk(KERN_ERR "can't get 2 addresses for control\n");
+ return -ENXIO;
+ }
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (p == 0)
+ return -ENXIO;
+ control_fb = p; /* save it for cleanups */
+
+ /* Map in frame buffer and registers */
+ p->fb_orig_base = fb_res.start;
+ p->fb_orig_size = resource_size(&fb_res);
+ /* use the big-endian aperture (??) */
+ p->frame_buffer_phys = fb_res.start + 0x800000;
+ p->control_regs_phys = reg_res.start;
+ p->control_regs_size = resource_size(&reg_res);
+
+ if (!p->fb_orig_base ||
+ !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
+ p->fb_orig_base = 0;
+ goto error_out;
+ }
+ /* map at most 8MB for the frame buffer */
+ p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
+ _PAGE_WRITETHRU);
+
+ if (!p->control_regs_phys ||
+ !request_mem_region(p->control_regs_phys, p->control_regs_size,
+ "controlfb regs")) {
+ p->control_regs_phys = 0;
+ goto error_out;
+ }
+ p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
+
+ p->cmap_regs_phys = 0xf301b000; /* XXX not in prom? */
+ if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
+ p->cmap_regs_phys = 0;
+ goto error_out;
+ }
+ p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
+
+ if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
+ goto error_out;
+
+ find_vram_size(p);
+ if (!p->total_vram)
+ goto error_out;
+
+ if (init_control(p) < 0)
+ goto error_out;
+
+ return 0;
+
+error_out:
+ control_cleanup();
+ return -ENXIO;
+}
+
+/*
+ * Get the monitor sense value.
+ * Note that this can be called before calibrate_delay,
+ * so we can't use udelay.
+ */
+static int read_control_sense(struct fb_info_control *p)
+{
+ int sense;
+
+ out_le32(CNTRL_REG(p,mon_sense), 7); /* drive all lines high */
+ __delay(200);
+ out_le32(CNTRL_REG(p,mon_sense), 077); /* turn off drivers */
+ __delay(2000);
+ sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
+
+ /* drive each sense line low in turn and collect the other 2 */
+ out_le32(CNTRL_REG(p,mon_sense), 033); /* drive A low */
+ __delay(2000);
+ sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
+ out_le32(CNTRL_REG(p,mon_sense), 055); /* drive B low */
+ __delay(2000);
+ sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
+ | ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
+ out_le32(CNTRL_REG(p,mon_sense), 066); /* drive C low */
+ __delay(2000);
+ sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
+
+ out_le32(CNTRL_REG(p,mon_sense), 077); /* turn off drivers */
+
+ return sense;
+}
+
+/********************** Various translation functions **********************/
+
+#define CONTROL_PIXCLOCK_BASE 256016
+#define CONTROL_PIXCLOCK_MIN 5000 /* ~ 200 MHz dot clock */
+
+/*
+ * calculate the clock paramaters to be sent to CUDA according to given
+ * pixclock in pico second.
+ */
+static int calc_clock_params(unsigned long clk, unsigned char *param)
+{
+ unsigned long p0, p1, p2, k, l, m, n, min;
+
+ if (clk > (CONTROL_PIXCLOCK_BASE << 3))
+ return 1;
+
+ p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
+ l = clk << p2;
+ p0 = 0;
+ p1 = 0;
+ for (k = 1, min = l; k < 32; k++) {
+ unsigned long rem;
+
+ m = CONTROL_PIXCLOCK_BASE * k;
+ n = m / l;
+ rem = m % l;
+ if (n && (n < 128) && rem < min) {
+ p0 = k;
+ p1 = n;
+ min = rem;
+ }
+ }
+ if (!p0 || !p1)
+ return 1;
+
+ param[0] = p0;
+ param[1] = p1;
+ param[2] = p2;
+
+ return 0;
+}
+
+
+/*
+ * This routine takes a user-supplied var, and picks the best vmode/cmode
+ * from it.
+ */
+
+static int control_var_to_par(struct fb_var_screeninfo *var,
+ struct fb_par_control *par, const struct fb_info *fb_info)
+{
+ int cmode, piped_diff, hstep;
+ unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
+ hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
+ unsigned long pixclock;
+ struct fb_info_control *p = (struct fb_info_control *) fb_info;
+ struct control_regvals *r = &par->regvals;
+
+ switch (var->bits_per_pixel) {
+ case 8:
+ par->cmode = CMODE_8;
+ if (p->total_vram > 0x200000) {
+ r->mode = 3;
+ r->radacal_ctrl = 0x20;
+ piped_diff = 13;
+ } else {
+ r->mode = 2;
+ r->radacal_ctrl = 0x10;
+ piped_diff = 9;
+ }
+ break;
+ case 15:
+ case 16:
+ par->cmode = CMODE_16;
+ if (p->total_vram > 0x200000) {
+ r->mode = 2;
+ r->radacal_ctrl = 0x24;
+ piped_diff = 5;
+ } else {
+ r->mode = 1;
+ r->radacal_ctrl = 0x14;
+ piped_diff = 3;
+ }
+ break;
+ case 32:
+ par->cmode = CMODE_32;
+ if (p->total_vram > 0x200000) {
+ r->mode = 1;
+ r->radacal_ctrl = 0x28;
+ } else {
+ r->mode = 0;
+ r->radacal_ctrl = 0x18;
+ }
+ piped_diff = 1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /*
+ * adjust xres and vxres so that the corresponding memory widths are
+ * 32-byte aligned
+ */
+ hstep = 31 >> par->cmode;
+ par->xres = (var->xres + hstep) & ~hstep;
+ par->vxres = (var->xres_virtual + hstep) & ~hstep;
+ par->xoffset = (var->xoffset + hstep) & ~hstep;
+ if (par->vxres < par->xres)
+ par->vxres = par->xres;
+ par->pitch = par->vxres << par->cmode;
+
+ par->yres = var->yres;
+ par->vyres = var->yres_virtual;
+ par->yoffset = var->yoffset;
+ if (par->vyres < par->yres)
+ par->vyres = par->yres;
+
+ par->sync = var->sync;
+
+ if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
+ return -EINVAL;
+
+ if (par->xoffset + par->xres > par->vxres)
+ par->xoffset = par->vxres - par->xres;
+ if (par->yoffset + par->yres > par->vyres)
+ par->yoffset = par->vyres - par->yres;
+
+ pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
+ var->pixclock;
+ if (calc_clock_params(pixclock, r->clock_params))
+ return -EINVAL;
+
+ hperiod = ((var->left_margin + par->xres + var->right_margin
+ + var->hsync_len) >> 1) - 2;
+ hssync = hperiod + 1;
+ hsblank = hssync - (var->right_margin >> 1);
+ hesync = (var->hsync_len >> 1) - 1;
+ heblank = (var->left_margin >> 1) + hesync;
+ piped = heblank - piped_diff;
+ heq = var->hsync_len >> 2;
+ hlfln = (hperiod+2) >> 1;
+ hserr = hssync-hesync;
+ vperiod = (var->vsync_len + var->lower_margin + par->yres
+ + var->upper_margin) << 1;
+ vssync = vperiod - 2;
+ vesync = (var->vsync_len << 1) - vperiod + vssync;
+ veblank = (var->upper_margin << 1) + vesync;
+ vsblank = vssync - (var->lower_margin << 1);
+ vswin = (vsblank+vssync) >> 1;
+ vewin = (vesync+veblank) >> 1;
+
+ r->regs[0] = vswin;
+ r->regs[1] = vsblank;
+ r->regs[2] = veblank;
+ r->regs[3] = vewin;
+ r->regs[4] = vesync;
+ r->regs[5] = vssync;
+ r->regs[6] = vperiod;
+ r->regs[7] = piped;
+ r->regs[8] = hperiod;
+ r->regs[9] = hsblank;
+ r->regs[10] = heblank;
+ r->regs[11] = hesync;
+ r->regs[12] = hssync;
+ r->regs[13] = heq;
+ r->regs[14] = hlfln;
+ r->regs[15] = hserr;
+
+ if (par->xres >= 1280 && par->cmode >= CMODE_16)
+ par->ctrl = 0x7f;
+ else
+ par->ctrl = 0x3b;
+
+ if (mac_var_to_vmode(var, &par->vmode, &cmode))
+ par->vmode = 0;
+
+ return 0;
+}
+
+
+/*
+ * Convert hardware data in par to an fb_var_screeninfo
+ */
+
+static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
+{
+ struct control_regints *rv;
+
+ rv = (struct control_regints *) par->regvals.regs;
+
+ memset(var, 0, sizeof(*var));
+ var->xres = par->xres;
+ var->yres = par->yres;
+ var->xres_virtual = par->vxres;
+ var->yres_virtual = par->vyres;
+ var->xoffset = par->xoffset;
+ var->yoffset = par->yoffset;
+
+ switch(par->cmode) {
+ default:
+ case CMODE_8:
+ var->bits_per_pixel = 8;
+ var->red.length = 8;
+ var->green.length = 8;
+ var->blue.length = 8;
+ break;
+ case CMODE_16: /* RGB 555 */
+ var->bits_per_pixel = 16;
+ var->red.offset = 10;
+ var->red.length = 5;
+ var->green.offset = 5;
+ var->green.length = 5;
+ var->blue.length = 5;
+ break;
+ case CMODE_32: /* RGB 888 */
+ var->bits_per_pixel = 32;
+ var->red.offset = 16;
+ var->red.length = 8;
+ var->green.offset = 8;
+ var->green.length = 8;
+ var->blue.length = 8;
+ var->transp.offset = 24;
+ var->transp.length = 8;
+ break;
+ }
+ var->height = -1;
+ var->width = -1;
+ var->vmode = FB_VMODE_NONINTERLACED;
+
+ var->left_margin = (rv->heblank - rv->hesync) << 1;
+ var->right_margin = (rv->hssync - rv->hsblank) << 1;
+ var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
+
+ var->upper_margin = (rv->veblank - rv->vesync) >> 1;
+ var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
+ var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
+
+ var->sync = par->sync;
+
+ /*
+ * 10^12 * clock_params[0] / (3906400 * clock_params[1]
+ * * 2^clock_params[2])
+ * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
+ * >> clock_params[2]
+ */
+ /* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
+ var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
+ var->pixclock /= par->regvals.clock_params[1];
+ var->pixclock >>= par->regvals.clock_params[2];
+}
+
+/*
+ * Set misc info vars for this driver
+ */
+static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
+{
+ /* Fill fb_info */
+ info->par = &p->par;
+ info->fbops = &controlfb_ops;
+ info->pseudo_palette = p->pseudo_palette;
+ info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
+ info->screen_base = p->frame_buffer + CTRLFB_OFF;
+
+ fb_alloc_cmap(&info->cmap, 256, 0);
+
+ /* Fill fix common fields */
+ strcpy(info->fix.id, "control");
+ info->fix.mmio_start = p->control_regs_phys;
+ info->fix.mmio_len = sizeof(struct control_regs);
+ info->fix.type = FB_TYPE_PACKED_PIXELS;
+ info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
+ info->fix.smem_len = p->total_vram - CTRLFB_OFF;
+ info->fix.ywrapstep = 0;
+ info->fix.type_aux = 0;
+ info->fix.accel = FB_ACCEL_NONE;
+}
+
+
+static void control_cleanup(void)
+{
+ struct fb_info_control *p = control_fb;
+
+ if (!p)
+ return;
+
+ if (p->cmap_regs)
+ iounmap(p->cmap_regs);
+ if (p->control_regs)
+ iounmap(p->control_regs);
+ if (p->frame_buffer) {
+ if (p->control_use_bank2)
+ p->frame_buffer -= 0x600000;
+ iounmap(p->frame_buffer);
+ }
+ if (p->cmap_regs_phys)
+ release_mem_region(p->cmap_regs_phys, 0x1000);
+ if (p->control_regs_phys)
+ release_mem_region(p->control_regs_phys, p->control_regs_size);
+ if (p->fb_orig_base)
+ release_mem_region(p->fb_orig_base, p->fb_orig_size);
+ kfree(p);
+}
+
+
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 08:51:44 +0000