| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Geode GX framebuffer driver. |
| * |
| * Copyright (C) 2006 Arcom Control Systems Ltd. |
| * |
| * This driver assumes that the BIOS has created a virtual PCI device header |
| * for the video device. The PCI header is assumed to contain the following |
| * BARs: |
| * |
| * BAR0 - framebuffer memory |
| * BAR1 - graphics processor registers |
| * BAR2 - display controller registers |
| * BAR3 - video processor and flat panel control registers. |
| * |
| * 16 MiB of framebuffer memory is assumed to be available. |
| */ |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <linux/delay.h> |
| #include <linux/fb.h> |
| #include <linux/console.h> |
| #include <linux/suspend.h> |
| #include <linux/init.h> |
| #include <linux/pci.h> |
| #include <linux/cs5535.h> |
| |
| #include <asm/olpc.h> |
| |
| #include "gxfb.h" |
| |
| static char *mode_option; |
| static int vram; |
| static int vt_switch; |
| |
| /* Modes relevant to the GX (taken from modedb.c) */ |
| static struct fb_videomode gx_modedb[] = { |
| /* 640x480-60 VESA */ |
| { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2, |
| 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 640x480-75 VESA */ |
| { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3, |
| 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 640x480-85 VESA */ |
| { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3, |
| 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 800x600-60 VESA */ |
| { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 800x600-75 VESA */ |
| { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 800x600-85 VESA */ |
| { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1024x768-60 VESA */ |
| { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6, |
| 0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1024x768-75 VESA */ |
| { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1024x768-85 VESA */ |
| { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1280x960-60 VESA */ |
| { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1280x960-85 VESA */ |
| { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1280x1024-60 VESA */ |
| { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1280x1024-75 VESA */ |
| { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1280x1024-85 VESA */ |
| { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1600x1200-60 VESA */ |
| { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1600x1200-75 VESA */ |
| { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| /* 1600x1200-85 VESA */ |
| { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA }, |
| }; |
| |
| static struct fb_videomode gx_dcon_modedb[] = { |
| /* The only mode the DCON has is 1200x900 */ |
| { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3, |
| FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
| FB_VMODE_NONINTERLACED, 0 } |
| }; |
| |
| static void get_modedb(struct fb_videomode **modedb, unsigned int *size) |
| { |
| if (olpc_has_dcon()) { |
| *modedb = (struct fb_videomode *) gx_dcon_modedb; |
| *size = ARRAY_SIZE(gx_dcon_modedb); |
| } else { |
| *modedb = (struct fb_videomode *) gx_modedb; |
| *size = ARRAY_SIZE(gx_modedb); |
| } |
| } |
| |
| static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) |
| { |
| if (var->xres > 1600 || var->yres > 1200) |
| return -EINVAL; |
| if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16) |
| return -EINVAL; |
| |
| if (var->bits_per_pixel == 32) { |
| var->red.offset = 16; var->red.length = 8; |
| var->green.offset = 8; var->green.length = 8; |
| var->blue.offset = 0; var->blue.length = 8; |
| } else if (var->bits_per_pixel == 16) { |
| var->red.offset = 11; var->red.length = 5; |
| var->green.offset = 5; var->green.length = 6; |
| var->blue.offset = 0; var->blue.length = 5; |
| } else if (var->bits_per_pixel == 8) { |
| var->red.offset = 0; var->red.length = 8; |
| var->green.offset = 0; var->green.length = 8; |
| var->blue.offset = 0; var->blue.length = 8; |
| } else |
| return -EINVAL; |
| var->transp.offset = 0; var->transp.length = 0; |
| |
| /* Enough video memory? */ |
| if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len) |
| return -EINVAL; |
| |
| /* FIXME: Check timing parameters here? */ |
| |
| return 0; |
| } |
| |
| static int gxfb_set_par(struct fb_info *info) |
| { |
| if (info->var.bits_per_pixel > 8) |
| info->fix.visual = FB_VISUAL_TRUECOLOR; |
| else |
| info->fix.visual = FB_VISUAL_PSEUDOCOLOR; |
| |
| info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel); |
| |
| gx_set_mode(info); |
| |
| return 0; |
| } |
| |
| static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) |
| { |
| chan &= 0xffff; |
| chan >>= 16 - bf->length; |
| return chan << bf->offset; |
| } |
| |
| static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green, |
| unsigned blue, unsigned transp, |
| struct fb_info *info) |
| { |
| if (info->var.grayscale) { |
| /* grayscale = 0.30*R + 0.59*G + 0.11*B */ |
| red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; |
| } |
| |
| /* Truecolor has hardware independent palette */ |
| if (info->fix.visual == FB_VISUAL_TRUECOLOR) { |
| u32 *pal = info->pseudo_palette; |
| u32 v; |
| |
| if (regno >= 16) |
| return -EINVAL; |
| |
| v = chan_to_field(red, &info->var.red); |
| v |= chan_to_field(green, &info->var.green); |
| v |= chan_to_field(blue, &info->var.blue); |
| |
| pal[regno] = v; |
| } else { |
| if (regno >= 256) |
| return -EINVAL; |
| |
| gx_set_hw_palette_reg(info, regno, red, green, blue); |
| } |
| |
| return 0; |
| } |
| |
| static int gxfb_blank(int blank_mode, struct fb_info *info) |
| { |
| return gx_blank_display(info, blank_mode); |
| } |
| |
| static int gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev) |
| { |
| struct gxfb_par *par = info->par; |
| int ret; |
| |
| ret = pci_enable_device(dev); |
| if (ret < 0) |
| return ret; |
| |
| ret = pci_request_region(dev, 3, "gxfb (video processor)"); |
| if (ret < 0) |
| return ret; |
| par->vid_regs = pci_ioremap_bar(dev, 3); |
| if (!par->vid_regs) |
| return -ENOMEM; |
| |
| ret = pci_request_region(dev, 2, "gxfb (display controller)"); |
| if (ret < 0) |
| return ret; |
| par->dc_regs = pci_ioremap_bar(dev, 2); |
| if (!par->dc_regs) |
| return -ENOMEM; |
| |
| ret = pci_request_region(dev, 1, "gxfb (graphics processor)"); |
| if (ret < 0) |
| return ret; |
| par->gp_regs = pci_ioremap_bar(dev, 1); |
| |
| if (!par->gp_regs) |
| return -ENOMEM; |
| |
| ret = pci_request_region(dev, 0, "gxfb (framebuffer)"); |
| if (ret < 0) |
| return ret; |
| |
| info->fix.smem_start = pci_resource_start(dev, 0); |
| info->fix.smem_len = vram ? vram : gx_frame_buffer_size(); |
| info->screen_base = ioremap_wc(info->fix.smem_start, |
| info->fix.smem_len); |
| if (!info->screen_base) |
| return -ENOMEM; |
| |
| /* Set the 16MiB aligned base address of the graphics memory region |
| * in the display controller */ |
| |
| write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000); |
| |
| dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n", |
| info->fix.smem_len / 1024, info->fix.smem_start); |
| |
| return 0; |
| } |
| |
| static const struct fb_ops gxfb_ops = { |
| .owner = THIS_MODULE, |
| .fb_check_var = gxfb_check_var, |
| .fb_set_par = gxfb_set_par, |
| .fb_setcolreg = gxfb_setcolreg, |
| .fb_blank = gxfb_blank, |
| /* No HW acceleration for now. */ |
| .fb_fillrect = cfb_fillrect, |
| .fb_copyarea = cfb_copyarea, |
| .fb_imageblit = cfb_imageblit, |
| }; |
| |
| static struct fb_info *gxfb_init_fbinfo(struct device *dev) |
| { |
| struct gxfb_par *par; |
| struct fb_info *info; |
| |
| /* Alloc enough space for the pseudo palette. */ |
| info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16, |
| dev); |
| if (!info) |
| return NULL; |
| |
| par = info->par; |
| |
| strcpy(info->fix.id, "Geode GX"); |
| |
| info->fix.type = FB_TYPE_PACKED_PIXELS; |
| info->fix.type_aux = 0; |
| info->fix.xpanstep = 0; |
| info->fix.ypanstep = 0; |
| info->fix.ywrapstep = 0; |
| info->fix.accel = FB_ACCEL_NONE; |
| |
| info->var.nonstd = 0; |
| info->var.activate = FB_ACTIVATE_NOW; |
| info->var.height = -1; |
| info->var.width = -1; |
| info->var.accel_flags = 0; |
| info->var.vmode = FB_VMODE_NONINTERLACED; |
| |
| info->fbops = &gxfb_ops; |
| info->flags = FBINFO_DEFAULT; |
| info->node = -1; |
| |
| info->pseudo_palette = (void *)par + sizeof(struct gxfb_par); |
| |
| info->var.grayscale = 0; |
| |
| if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { |
| framebuffer_release(info); |
| return NULL; |
| } |
| |
| return info; |
| } |
| |
| static int __maybe_unused gxfb_suspend(struct device *dev) |
| { |
| struct fb_info *info = dev_get_drvdata(dev); |
| |
| console_lock(); |
| gx_powerdown(info); |
| fb_set_suspend(info, 1); |
| console_unlock(); |
| |
| /* there's no point in setting PCI states; we emulate PCI, so |
| * we don't end up getting power savings anyways */ |
| |
| return 0; |
| } |
| |
| static int __maybe_unused gxfb_resume(struct device *dev) |
| { |
| struct fb_info *info = dev_get_drvdata(dev); |
| int ret; |
| |
| console_lock(); |
| ret = gx_powerup(info); |
| if (ret) { |
| printk(KERN_ERR "gxfb: power up failed!\n"); |
| return ret; |
| } |
| |
| fb_set_suspend(info, 0); |
| console_unlock(); |
| return 0; |
| } |
| |
| static int gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
| { |
| struct gxfb_par *par; |
| struct fb_info *info; |
| int ret; |
| unsigned long val; |
| |
| struct fb_videomode *modedb_ptr; |
| unsigned int modedb_size; |
| |
| info = gxfb_init_fbinfo(&pdev->dev); |
| if (!info) |
| return -ENOMEM; |
| par = info->par; |
| |
| if ((ret = gxfb_map_video_memory(info, pdev)) < 0) { |
| dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n"); |
| goto err; |
| } |
| |
| /* Figure out if this is a TFT or CRT part */ |
| |
| rdmsrl(MSR_GX_GLD_MSR_CONFIG, val); |
| |
| if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP) |
| par->enable_crt = 0; |
| else |
| par->enable_crt = 1; |
| |
| get_modedb(&modedb_ptr, &modedb_size); |
| ret = fb_find_mode(&info->var, info, mode_option, |
| modedb_ptr, modedb_size, NULL, 16); |
| if (ret == 0 || ret == 4) { |
| dev_err(&pdev->dev, "could not find valid video mode\n"); |
| ret = -EINVAL; |
| goto err; |
| } |
| |
| |
| /* Clear the frame buffer of garbage. */ |
| memset_io(info->screen_base, 0, info->fix.smem_len); |
| |
| gxfb_check_var(&info->var, info); |
| gxfb_set_par(info); |
| |
| pm_set_vt_switch(vt_switch); |
| |
| if (register_framebuffer(info) < 0) { |
| ret = -EINVAL; |
| goto err; |
| } |
| pci_set_drvdata(pdev, info); |
| fb_info(info, "%s frame buffer device\n", info->fix.id); |
| return 0; |
| |
| err: |
| if (info->screen_base) { |
| iounmap(info->screen_base); |
| pci_release_region(pdev, 0); |
| } |
| if (par->vid_regs) { |
| iounmap(par->vid_regs); |
| pci_release_region(pdev, 3); |
| } |
| if (par->dc_regs) { |
| iounmap(par->dc_regs); |
| pci_release_region(pdev, 2); |
| } |
| if (par->gp_regs) { |
| iounmap(par->gp_regs); |
| pci_release_region(pdev, 1); |
| } |
| |
| fb_dealloc_cmap(&info->cmap); |
| framebuffer_release(info); |
| return ret; |
| } |
| |
| static void gxfb_remove(struct pci_dev *pdev) |
| { |
| struct fb_info *info = pci_get_drvdata(pdev); |
| struct gxfb_par *par = info->par; |
| |
| unregister_framebuffer(info); |
| |
| iounmap((void __iomem *)info->screen_base); |
| pci_release_region(pdev, 0); |
| |
| iounmap(par->vid_regs); |
| pci_release_region(pdev, 3); |
| |
| iounmap(par->dc_regs); |
| pci_release_region(pdev, 2); |
| |
| iounmap(par->gp_regs); |
| pci_release_region(pdev, 1); |
| |
| fb_dealloc_cmap(&info->cmap); |
| |
| framebuffer_release(info); |
| } |
| |
| static const struct pci_device_id gxfb_id_table[] = { |
| { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) }, |
| { 0, } |
| }; |
| |
| MODULE_DEVICE_TABLE(pci, gxfb_id_table); |
| |
| static const struct dev_pm_ops gxfb_pm_ops = { |
| #ifdef CONFIG_PM_SLEEP |
| .suspend = gxfb_suspend, |
| .resume = gxfb_resume, |
| .freeze = NULL, |
| .thaw = gxfb_resume, |
| .poweroff = NULL, |
| .restore = gxfb_resume, |
| #endif |
| }; |
| |
| static struct pci_driver gxfb_driver = { |
| .name = "gxfb", |
| .id_table = gxfb_id_table, |
| .probe = gxfb_probe, |
| .remove = gxfb_remove, |
| .driver.pm = &gxfb_pm_ops, |
| }; |
| |
| #ifndef MODULE |
| static int __init gxfb_setup(char *options) |
| { |
| |
| char *opt; |
| |
| if (!options || !*options) |
| return 0; |
| |
| while ((opt = strsep(&options, ",")) != NULL) { |
| if (!*opt) |
| continue; |
| |
| mode_option = opt; |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| static int __init gxfb_init(void) |
| { |
| #ifndef MODULE |
| char *option = NULL; |
| |
| if (fb_get_options("gxfb", &option)) |
| return -ENODEV; |
| |
| gxfb_setup(option); |
| #endif |
| return pci_register_driver(&gxfb_driver); |
| } |
| |
| static void __exit gxfb_cleanup(void) |
| { |
| pci_unregister_driver(&gxfb_driver); |
| } |
| |
| module_init(gxfb_init); |
| module_exit(gxfb_cleanup); |
| |
| module_param(mode_option, charp, 0); |
| MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])"); |
| |
| module_param(vram, int, 0); |
| MODULE_PARM_DESC(vram, "video memory size"); |
| |
| module_param(vt_switch, int, 0); |
| MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume"); |
| |
| MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX"); |
| MODULE_LICENSE("GPL"); |