// SPDX-License-Identifier: GPL-2.0-only /* * drivers/video/pvr2fb.c * * Frame buffer and fbcon support for the NEC PowerVR2 found within the Sega * Dreamcast. * * Copyright (c) 2001 M. R. Brown <[email protected]> * Copyright (c) 2001 - 2008 Paul Mundt <[email protected]> * * This driver is mostly based on the excellent amifb and vfb sources. It uses * an odd scheme for converting hardware values to/from framebuffer values, * here are some hacked-up formulas: * * The Dreamcast has screen offsets from each side of its four borders and * the start offsets of the display window. I used these values to calculate * 'pseudo' values (think of them as placeholders) for the fb video mode, so * that when it came time to convert these values back into their hardware * values, I could just add mode- specific offsets to get the correct mode * settings: * * left_margin = diwstart_h - borderstart_h; * right_margin = borderstop_h - (diwstart_h + xres); * upper_margin = diwstart_v - borderstart_v; * lower_margin = borderstop_v - (diwstart_h + yres); * * hsync_len = borderstart_h + (hsync_total - borderstop_h); * vsync_len = borderstart_v + (vsync_total - borderstop_v); * * Then, when it's time to convert back to hardware settings, the only * constants are the borderstart_* offsets, all other values are derived from * the fb video mode: * * // PAL * borderstart_h = 116; * borderstart_v = 44; * ... * borderstop_h = borderstart_h + hsync_total - hsync_len; * ... * diwstart_v = borderstart_v - upper_margin; * * However, in the current implementation, the borderstart values haven't had * the benefit of being fully researched, so some modes may be broken. */ #undef DEBUG #include <linux/aperture.h> #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/delay.h> #include <linux/interrupt.h> #include <linux/fb.h> #include <linux/init.h> #include <linux/pci.h> #ifdef CONFIG_SH_DREAMCAST #include <asm/machvec.h> #include <mach-dreamcast/mach/sysasic.h> #endif #ifdef CONFIG_PVR2_DMA #include <linux/pagemap.h> #include <mach/dma.h> #include <asm/dma.h> #endif #ifdef CONFIG_SH_STORE_QUEUES #include <linux/uaccess.h> #include <cpu/sq.h> #endif #ifndef PCI_DEVICE_ID_NEC_NEON250 #define PCI_DEVICE_ID_NEC_NEON250 … #endif /* 2D video registers */ #define DISP_BASE … #define DISP_BRDRCOLR … #define DISP_DIWMODE … #define DISP_DIWADDRL … #define DISP_DIWADDRS … #define DISP_DIWSIZE … #define DISP_SYNCCONF … #define DISP_BRDRHORZ … #define DISP_SYNCSIZE … #define DISP_BRDRVERT … #define DISP_DIWCONF … #define DISP_DIWHSTRT … #define DISP_DIWVSTRT … #define DISP_PIXDEPTH … /* Pixel clocks, one for TV output, doubled for VGA output */ #define TV_CLK … #define VGA_CLK … /* This is for 60Hz - the VTOTAL is doubled for interlaced modes */ #define PAL_HTOTAL … #define PAL_VTOTAL … #define NTSC_HTOTAL … #define NTSC_VTOTAL … /* Supported cable types */ enum { … }; /* Supported video output types */ enum { … }; /* Supported palette types */ enum { … }; struct pvr2_params { … }; static struct pvr2_params cables[] = …; static struct pvr2_params outputs[] = …; /* * This describes the current video mode */ static struct pvr2fb_par { … } *currentpar; static struct fb_info *fb_info; static struct fb_fix_screeninfo pvr2_fix = …; static const struct fb_var_screeninfo pvr2_var = …; static int cable_type = …; static int video_output = …; static int nopan = …; static int nowrap = …; /* * We do all updating, blanking, etc. during the vertical retrace period */ static unsigned int do_vmode_full = …; /* Change the video mode */ static unsigned int do_vmode_pan = …; /* Update the video mode */ static short do_blank = …; /* (Un)Blank the screen */ static unsigned int is_blanked = …; /* Is the screen blanked? */ #ifdef CONFIG_SH_STORE_QUEUES static unsigned long pvr2fb_map; #endif #ifdef CONFIG_PVR2_DMA static unsigned int shdma = PVR2_CASCADE_CHAN; static unsigned int pvr2dma = ONCHIP_NR_DMA_CHANNELS; #endif static struct fb_videomode pvr2_modedb[] = …; #define NUM_TOTAL_MODES … #define DEFMODE_NTSC … #define DEFMODE_PAL … #define DEFMODE_VGA … static int defmode = …; static char *mode_option = …; static inline void pvr2fb_set_pal_type(unsigned int type) { … } static inline void pvr2fb_set_pal_entry(struct pvr2fb_par *par, unsigned int regno, unsigned int val) { … } static int pvr2fb_blank(int blank, struct fb_info *info) { … } static inline unsigned long get_line_length(int xres_virtual, int bpp) { … } static void set_color_bitfields(struct fb_var_screeninfo *var) { … } static int pvr2fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, unsigned int blue, unsigned int transp, struct fb_info *info) { … } /* * Determine the cable type and initialize the cable output format. Don't do * anything if the cable type has been overidden (via "cable:XX"). */ #define PCTRA … #define PDTRA … #define VOUTC … static int pvr2_init_cable(void) { … } static int pvr2fb_set_par(struct fb_info *info) { … } static int pvr2fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { … } static void pvr2_update_display(struct fb_info *info) { … } /* * Initialize the video mode. Currently, the 16bpp and 24bpp modes aren't * very stable. It's probably due to the fact that a lot of the 2D video * registers are still undocumented. */ static void pvr2_init_display(struct fb_info *info) { … } /* Simulate blanking by making the border cover the entire screen */ #define BLANK_BIT … static void pvr2_do_blank(void) { … } static irqreturn_t __maybe_unused pvr2fb_interrupt(int irq, void *dev_id) { … } #ifdef CONFIG_PVR2_DMA static ssize_t pvr2fb_write(struct fb_info *info, const char *buf, size_t count, loff_t *ppos) { unsigned long dst, start, end, len; unsigned int nr_pages; struct page **pages; int ret, i; if (!info->screen_base) return -ENODEV; nr_pages = (count + PAGE_SIZE - 1) >> PAGE_SHIFT; pages = kmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL); if (!pages) return -ENOMEM; ret = pin_user_pages_fast((unsigned long)buf, nr_pages, FOLL_WRITE, pages); if (ret < nr_pages) { if (ret < 0) { /* * Clamp the unsigned nr_pages to zero so that the * error handling works. And leave ret at whatever * -errno value was returned from GUP. */ nr_pages = 0; } else { nr_pages = ret; /* * Use -EINVAL to represent a mildly desperate guess at * why we got fewer pages (maybe even zero pages) than * requested. */ ret = -EINVAL; } goto out_unmap; } dma_configure_channel(shdma, 0x12c1); dst = (unsigned long)fb_info->screen_base + *ppos; start = (unsigned long)page_address(pages[0]); end = (unsigned long)page_address(pages[nr_pages]); len = nr_pages << PAGE_SHIFT; /* Half-assed contig check */ if (start + len == end) { /* As we do this in one shot, it's either all or nothing.. */ if ((*ppos + len) > fb_info->fix.smem_len) { ret = -ENOSPC; goto out_unmap; } dma_write(shdma, start, 0, len); dma_write(pvr2dma, 0, dst, len); dma_wait_for_completion(pvr2dma); goto out; } /* Not contiguous, writeout per-page instead.. */ for (i = 0; i < nr_pages; i++, dst += PAGE_SIZE) { if ((*ppos + (i << PAGE_SHIFT)) > fb_info->fix.smem_len) { ret = -ENOSPC; goto out_unmap; } dma_write_page(shdma, (unsigned long)page_address(pages[i]), 0); dma_write_page(pvr2dma, 0, dst); dma_wait_for_completion(pvr2dma); } out: *ppos += count; ret = count; out_unmap: unpin_user_pages(pages, nr_pages); kfree(pages); return ret; } #endif /* CONFIG_PVR2_DMA */ static const struct fb_ops pvr2fb_ops = …; #ifndef MODULE static int pvr2_get_param_val(const struct pvr2_params *p, const char *s, int size) { … } #endif static char *pvr2_get_param_name(const struct pvr2_params *p, int val, int size) { … } /** * pvr2fb_common_init * * Common init code for the PVR2 chips. * * This mostly takes care of the common aspects of the fb setup and * registration. It's expected that the board-specific init code has * already setup pvr2_fix with something meaningful at this point. * * Device info reporting is also done here, as well as picking a sane * default from the modedb. For board-specific modelines, simply define * a per-board modedb. * * Also worth noting is that the cable and video output types are likely * always going to be VGA for the PCI-based PVR2 boards, but we leave this * in for flexibility anyways. Who knows, maybe someone has tv-out on a * PCI-based version of these things ;-) */ static int __maybe_unused pvr2fb_common_init(void) { … } #ifdef CONFIG_SH_DREAMCAST static int __init pvr2fb_dc_init(void) { if (!mach_is_dreamcast()) return -ENXIO; /* Make a guess at the monitor based on the attached cable */ if (pvr2_init_cable() == CT_VGA) { fb_info->monspecs.hfmin = 30000; fb_info->monspecs.hfmax = 70000; fb_info->monspecs.vfmin = 60; fb_info->monspecs.vfmax = 60; } else { /* Not VGA, using a TV (taken from acornfb) */ fb_info->monspecs.hfmin = 15469; fb_info->monspecs.hfmax = 15781; fb_info->monspecs.vfmin = 49; fb_info->monspecs.vfmax = 51; } /* * XXX: This needs to pull default video output via BIOS or other means */ if (video_output < 0) { if (cable_type == CT_VGA) { video_output = VO_VGA; } else { video_output = VO_NTSC; } } /* * Nothing exciting about the DC PVR2 .. only a measly 8MiB. */ pvr2_fix.smem_start = 0xa5000000; /* RAM starts here */ pvr2_fix.smem_len = 8 << 20; pvr2_fix.mmio_start = 0xa05f8000; /* registers start here */ pvr2_fix.mmio_len = 0x2000; if (request_irq(HW_EVENT_VSYNC, pvr2fb_interrupt, IRQF_SHARED, "pvr2 VBL handler", fb_info)) { return -EBUSY; } #ifdef CONFIG_PVR2_DMA if (request_dma(pvr2dma, "pvr2") != 0) { free_irq(HW_EVENT_VSYNC, fb_info); return -EBUSY; } #endif return pvr2fb_common_init(); } static void pvr2fb_dc_exit(void) { if (fb_info->screen_base) { iounmap(fb_info->screen_base); fb_info->screen_base = NULL; } if (currentpar->mmio_base) { iounmap(currentpar->mmio_base); currentpar->mmio_base = NULL; } free_irq(HW_EVENT_VSYNC, fb_info); #ifdef CONFIG_PVR2_DMA free_dma(pvr2dma); #endif } #endif /* CONFIG_SH_DREAMCAST */ #ifdef CONFIG_PCI static int pvr2fb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { … } static void pvr2fb_pci_remove(struct pci_dev *pdev) { … } static const struct pci_device_id pvr2fb_pci_tbl[] = …; MODULE_DEVICE_TABLE(pci, pvr2fb_pci_tbl); static struct pci_driver pvr2fb_pci_driver = …; static int __init pvr2fb_pci_init(void) { … } static void pvr2fb_pci_exit(void) { … } #endif /* CONFIG_PCI */ /* * Parse command arguments. Supported arguments are: * inverse Use inverse color maps * cable:composite|rgb|vga Override the video cable type * output:NTSC|PAL|VGA Override the video output format * * <xres>x<yres>[-<bpp>][@<refresh>] or, * <name>[-<bpp>][@<refresh>] Startup using this video mode */ #ifndef MODULE static int __init pvr2fb_setup(char *options) { … } #endif static struct pvr2_board { … } board_driver[] __refdata = …; static int __init pvr2fb_init(void) { … } static void __exit pvr2fb_exit(void) { … } module_init(…) …; module_exit(pvr2fb_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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