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Diffstat (limited to '')
| -rw-r--r-- | drivers/video/fbdev/sa1100fb.c | 1229 |
1 files changed, 1229 insertions, 0 deletions
diff --git a/drivers/video/fbdev/sa1100fb.c b/drivers/video/fbdev/sa1100fb.c new file mode 100644 index 000000000..017c8efe8 --- /dev/null +++ b/drivers/video/fbdev/sa1100fb.c @@ -0,0 +1,1229 @@ +/* + * linux/drivers/video/sa1100fb.c + * + * Copyright (C) 1999 Eric A. Thomas + * Based on acornfb.c Copyright (C) Russell King. + * + * 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. + * + * StrongARM 1100 LCD Controller Frame Buffer Driver + * + * Please direct your questions and comments on this driver to the following + * email address: + * + * linux-arm-kernel@lists.arm.linux.org.uk + * + * Clean patches should be sent to the ARM Linux Patch System. Please see the + * following web page for more information: + * + * https://www.arm.linux.org.uk/developer/patches/info.shtml + * + * Thank you. + * + * Known problems: + * - With the Neponset plugged into an Assabet, LCD powerdown + * doesn't work (LCD stays powered up). Therefore we shouldn't + * blank the screen. + * - We don't limit the CPU clock rate nor the mode selection + * according to the available SDRAM bandwidth. + * + * Other notes: + * - Linear grayscale palettes and the kernel. + * Such code does not belong in the kernel. The kernel frame buffer + * drivers do not expect a linear colourmap, but a colourmap based on + * the VT100 standard mapping. + * + * If your _userspace_ requires a linear colourmap, then the setup of + * such a colourmap belongs _in userspace_, not in the kernel. Code + * to set the colourmap correctly from user space has been sent to + * David Neuer. It's around 8 lines of C code, plus another 4 to + * detect if we are using grayscale. + * + * - The following must never be specified in a panel definition: + * LCCR0_LtlEnd, LCCR3_PixClkDiv, LCCR3_VrtSnchL, LCCR3_HorSnchL + * + * - The following should be specified: + * either LCCR0_Color or LCCR0_Mono + * either LCCR0_Sngl or LCCR0_Dual + * either LCCR0_Act or LCCR0_Pas + * either LCCR3_OutEnH or LCCD3_OutEnL + * either LCCR3_PixRsEdg or LCCR3_PixFlEdg + * either LCCR3_ACBsDiv or LCCR3_ACBsCntOff + * + * Code Status: + * 1999/04/01: + * - Driver appears to be working for Brutus 320x200x8bpp mode. Other + * resolutions are working, but only the 8bpp mode is supported. + * Changes need to be made to the palette encode and decode routines + * to support 4 and 16 bpp modes. + * Driver is not designed to be a module. The FrameBuffer is statically + * allocated since dynamic allocation of a 300k buffer cannot be + * guaranteed. + * + * 1999/06/17: + * - FrameBuffer memory is now allocated at run-time when the + * driver is initialized. + * + * 2000/04/10: Nicolas Pitre <nico@fluxnic.net> + * - Big cleanup for dynamic selection of machine type at run time. + * + * 2000/07/19: Jamey Hicks <jamey@crl.dec.com> + * - Support for Bitsy aka Compaq iPAQ H3600 added. + * + * 2000/08/07: Tak-Shing Chan <tchan.rd@idthk.com> + * Jeff Sutherland <jsutherland@accelent.com> + * - Resolved an issue caused by a change made to the Assabet's PLD + * earlier this year which broke the framebuffer driver for newer + * Phase 4 Assabets. Some other parameters were changed to optimize + * for the Sharp display. + * + * 2000/08/09: Kunihiko IMAI <imai@vasara.co.jp> + * - XP860 support added + * + * 2000/08/19: Mark Huang <mhuang@livetoy.com> + * - Allows standard options to be passed on the kernel command line + * for most common passive displays. + * + * 2000/08/29: + * - s/save_flags_cli/local_irq_save/ + * - remove unneeded extra save_flags_cli in sa1100fb_enable_lcd_controller + * + * 2000/10/10: Erik Mouw <J.A.K.Mouw@its.tudelft.nl> + * - Updated LART stuff. Fixed some minor bugs. + * + * 2000/10/30: Murphy Chen <murphy@mail.dialogue.com.tw> + * - Pangolin support added + * + * 2000/10/31: Roman Jordan <jor@hoeft-wessel.de> + * - Huw Webpanel support added + * + * 2000/11/23: Eric Peng <ericpeng@coventive.com> + * - Freebird add + * + * 2001/02/07: Jamey Hicks <jamey.hicks@compaq.com> + * Cliff Brake <cbrake@accelent.com> + * - Added PM callback + * + * 2001/05/26: <rmk@arm.linux.org.uk> + * - Fix 16bpp so that (a) we use the right colours rather than some + * totally random colour depending on what was in page 0, and (b) + * we don't de-reference a NULL pointer. + * - remove duplicated implementation of consistent_alloc() + * - convert dma address types to dma_addr_t + * - remove unused 'montype' stuff + * - remove redundant zero inits of init_var after the initial + * memset. + * - remove allow_modeset (acornfb idea does not belong here) + * + * 2001/05/28: <rmk@arm.linux.org.uk> + * - massive cleanup - move machine dependent data into structures + * - I've left various #warnings in - if you see one, and know + * the hardware concerned, please get in contact with me. + * + * 2001/05/31: <rmk@arm.linux.org.uk> + * - Fix LCCR1 HSW value, fix all machine type specifications to + * keep values in line. (Please check your machine type specs) + * + * 2001/06/10: <rmk@arm.linux.org.uk> + * - Fiddle with the LCD controller from task context only; mainly + * so that we can run with interrupts on, and sleep. + * - Convert #warnings into #errors. No pain, no gain. ;) + * + * 2001/06/14: <rmk@arm.linux.org.uk> + * - Make the palette BPS value for 12bpp come out correctly. + * - Take notice of "greyscale" on any colour depth. + * - Make truecolor visuals use the RGB channel encoding information. + * + * 2001/07/02: <rmk@arm.linux.org.uk> + * - Fix colourmap problems. + * + * 2001/07/13: <abraham@2d3d.co.za> + * - Added support for the ICP LCD-Kit01 on LART. This LCD is + * manufactured by Prime View, model no V16C6448AB + * + * 2001/07/23: <rmk@arm.linux.org.uk> + * - Hand merge version from handhelds.org CVS tree. See patch + * notes for 595/1 for more information. + * - Drop 12bpp (it's 16bpp with different colour register mappings). + * - This hardware can not do direct colour. Therefore we don't + * support it. + * + * 2001/07/27: <rmk@arm.linux.org.uk> + * - Halve YRES on dual scan LCDs. + * + * 2001/08/22: <rmk@arm.linux.org.uk> + * - Add b/w iPAQ pixclock value. + * + * 2001/10/12: <rmk@arm.linux.org.uk> + * - Add patch 681/1 and clean up stork definitions. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/fb.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/cpufreq.h> +#include <linux/gpio/consumer.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/mutex.h> +#include <linux/io.h> +#include <linux/clk.h> + +#include <video/sa1100fb.h> + +#include <mach/hardware.h> +#include <asm/mach-types.h> +#include <mach/shannon.h> + +/* + * Complain if VAR is out of range. + */ +#define DEBUG_VAR 1 + +#include "sa1100fb.h" + +static const struct sa1100fb_rgb rgb_4 = { + .red = { .offset = 0, .length = 4, }, + .green = { .offset = 0, .length = 4, }, + .blue = { .offset = 0, .length = 4, }, + .transp = { .offset = 0, .length = 0, }, +}; + +static const struct sa1100fb_rgb rgb_8 = { + .red = { .offset = 0, .length = 8, }, + .green = { .offset = 0, .length = 8, }, + .blue = { .offset = 0, .length = 8, }, + .transp = { .offset = 0, .length = 0, }, +}; + +static const struct sa1100fb_rgb def_rgb_16 = { + .red = { .offset = 11, .length = 5, }, + .green = { .offset = 5, .length = 6, }, + .blue = { .offset = 0, .length = 5, }, + .transp = { .offset = 0, .length = 0, }, +}; + + + +static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_info *); +static void set_ctrlr_state(struct sa1100fb_info *fbi, u_int state); + +static inline void sa1100fb_schedule_work(struct sa1100fb_info *fbi, u_int state) +{ + unsigned long flags; + + local_irq_save(flags); + /* + * We need to handle two requests being made at the same time. + * There are two important cases: + * 1. When we are changing VT (C_REENABLE) while unblanking (C_ENABLE) + * We must perform the unblanking, which will do our REENABLE for us. + * 2. When we are blanking, but immediately unblank before we have + * blanked. We do the "REENABLE" thing here as well, just to be sure. + */ + if (fbi->task_state == C_ENABLE && state == C_REENABLE) + state = (u_int) -1; + if (fbi->task_state == C_DISABLE && state == C_ENABLE) + state = C_REENABLE; + + if (state != (u_int)-1) { + fbi->task_state = state; + schedule_work(&fbi->task); + } + local_irq_restore(flags); +} + +static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) +{ + chan &= 0xffff; + chan >>= 16 - bf->length; + return chan << bf->offset; +} + +/* + * Convert bits-per-pixel to a hardware palette PBS value. + */ +static inline u_int palette_pbs(struct fb_var_screeninfo *var) +{ + int ret = 0; + switch (var->bits_per_pixel) { + case 4: ret = 0 << 12; break; + case 8: ret = 1 << 12; break; + case 16: ret = 2 << 12; break; + } + return ret; +} + +static int +sa1100fb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue, + u_int trans, struct fb_info *info) +{ + struct sa1100fb_info *fbi = + container_of(info, struct sa1100fb_info, fb); + u_int val, ret = 1; + + if (regno < fbi->palette_size) { + val = ((red >> 4) & 0xf00); + val |= ((green >> 8) & 0x0f0); + val |= ((blue >> 12) & 0x00f); + + if (regno == 0) + val |= palette_pbs(&fbi->fb.var); + + fbi->palette_cpu[regno] = val; + ret = 0; + } + return ret; +} + +static int +sa1100fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, + u_int trans, struct fb_info *info) +{ + struct sa1100fb_info *fbi = + container_of(info, struct sa1100fb_info, fb); + unsigned int val; + int ret = 1; + + /* + * If inverse mode was selected, invert all the colours + * rather than the register number. The register number + * is what you poke into the framebuffer to produce the + * colour you requested. + */ + if (fbi->inf->cmap_inverse) { + red = 0xffff - red; + green = 0xffff - green; + blue = 0xffff - blue; + } + + /* + * If greyscale is true, then we convert the RGB value + * to greyscale no mater what visual we are using. + */ + if (fbi->fb.var.grayscale) + red = green = blue = (19595 * red + 38470 * green + + 7471 * blue) >> 16; + + switch (fbi->fb.fix.visual) { + case FB_VISUAL_TRUECOLOR: + /* + * 12 or 16-bit True Colour. We encode the RGB value + * according to the RGB bitfield information. + */ + if (regno < 16) { + val = chan_to_field(red, &fbi->fb.var.red); + val |= chan_to_field(green, &fbi->fb.var.green); + val |= chan_to_field(blue, &fbi->fb.var.blue); + + fbi->pseudo_palette[regno] = val; + ret = 0; + } + break; + + case FB_VISUAL_STATIC_PSEUDOCOLOR: + case FB_VISUAL_PSEUDOCOLOR: + ret = sa1100fb_setpalettereg(regno, red, green, blue, trans, info); + break; + } + + return ret; +} + +#ifdef CONFIG_CPU_FREQ +/* + * sa1100fb_display_dma_period() + * Calculate the minimum period (in picoseconds) between two DMA + * requests for the LCD controller. If we hit this, it means we're + * doing nothing but LCD DMA. + */ +static inline unsigned int sa1100fb_display_dma_period(struct fb_var_screeninfo *var) +{ + /* + * Period = pixclock * bits_per_byte * bytes_per_transfer + * / memory_bits_per_pixel; + */ + return var->pixclock * 8 * 16 / var->bits_per_pixel; +} +#endif + +/* + * sa1100fb_check_var(): + * Round up in the following order: bits_per_pixel, xres, + * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale, + * bitfields, horizontal timing, vertical timing. + */ +static int +sa1100fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) +{ + struct sa1100fb_info *fbi = + container_of(info, struct sa1100fb_info, fb); + int rgbidx; + + if (var->xres < MIN_XRES) + var->xres = MIN_XRES; + if (var->yres < MIN_YRES) + var->yres = MIN_YRES; + if (var->xres > fbi->inf->xres) + var->xres = fbi->inf->xres; + if (var->yres > fbi->inf->yres) + var->yres = fbi->inf->yres; + var->xres_virtual = max(var->xres_virtual, var->xres); + var->yres_virtual = max(var->yres_virtual, var->yres); + + dev_dbg(fbi->dev, "var->bits_per_pixel=%d\n", var->bits_per_pixel); + switch (var->bits_per_pixel) { + case 4: + rgbidx = RGB_4; + break; + case 8: + rgbidx = RGB_8; + break; + case 16: + rgbidx = RGB_16; + break; + default: + return -EINVAL; + } + + /* + * Copy the RGB parameters for this display + * from the machine specific parameters. + */ + var->red = fbi->rgb[rgbidx]->red; + var->green = fbi->rgb[rgbidx]->green; + var->blue = fbi->rgb[rgbidx]->blue; + var->transp = fbi->rgb[rgbidx]->transp; + + dev_dbg(fbi->dev, "RGBT length = %d:%d:%d:%d\n", + var->red.length, var->green.length, var->blue.length, + var->transp.length); + + dev_dbg(fbi->dev, "RGBT offset = %d:%d:%d:%d\n", + var->red.offset, var->green.offset, var->blue.offset, + var->transp.offset); + +#ifdef CONFIG_CPU_FREQ + dev_dbg(fbi->dev, "dma period = %d ps, clock = %ld kHz\n", + sa1100fb_display_dma_period(var), + clk_get_rate(fbi->clk) / 1000); +#endif + + return 0; +} + +static void sa1100fb_set_visual(struct sa1100fb_info *fbi, u32 visual) +{ + if (fbi->inf->set_visual) + fbi->inf->set_visual(visual); +} + +/* + * sa1100fb_set_par(): + * Set the user defined part of the display for the specified console + */ +static int sa1100fb_set_par(struct fb_info *info) +{ + struct sa1100fb_info *fbi = + container_of(info, struct sa1100fb_info, fb); + struct fb_var_screeninfo *var = &info->var; + unsigned long palette_mem_size; + + dev_dbg(fbi->dev, "set_par\n"); + + if (var->bits_per_pixel == 16) + fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR; + else if (!fbi->inf->cmap_static) + fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR; + else { + /* + * Some people have weird ideas about wanting static + * pseudocolor maps. I suspect their user space + * applications are broken. + */ + fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; + } + + fbi->fb.fix.line_length = var->xres_virtual * + var->bits_per_pixel / 8; + fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16; + + palette_mem_size = fbi->palette_size * sizeof(u16); + + dev_dbg(fbi->dev, "palette_mem_size = 0x%08lx\n", palette_mem_size); + + fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size); + fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size; + + /* + * Set (any) board control register to handle new color depth + */ + sa1100fb_set_visual(fbi, fbi->fb.fix.visual); + sa1100fb_activate_var(var, fbi); + + return 0; +} + +#if 0 +static int +sa1100fb_set_cmap(struct fb_cmap *cmap, int kspc, int con, + struct fb_info *info) +{ + struct sa1100fb_info *fbi = (struct sa1100fb_info *)info; + + /* + * Make sure the user isn't doing something stupid. + */ + if (!kspc && (fbi->fb.var.bits_per_pixel == 16 || fbi->inf->cmap_static)) + return -EINVAL; + + return gen_set_cmap(cmap, kspc, con, info); +} +#endif + +/* + * Formal definition of the VESA spec: + * On + * This refers to the state of the display when it is in full operation + * Stand-By + * This defines an optional operating state of minimal power reduction with + * the shortest recovery time + * Suspend + * This refers to a level of power management in which substantial power + * reduction is achieved by the display. The display can have a longer + * recovery time from this state than from the Stand-by state + * Off + * This indicates that the display is consuming the lowest level of power + * and is non-operational. Recovery from this state may optionally require + * the user to manually power on the monitor + * + * Now, the fbdev driver adds an additional state, (blank), where they + * turn off the video (maybe by colormap tricks), but don't mess with the + * video itself: think of it semantically between on and Stand-By. + * + * So here's what we should do in our fbdev blank routine: + * + * VESA_NO_BLANKING (mode 0) Video on, front/back light on + * VESA_VSYNC_SUSPEND (mode 1) Video on, front/back light off + * VESA_HSYNC_SUSPEND (mode 2) Video on, front/back light off + * VESA_POWERDOWN (mode 3) Video off, front/back light off + * + * This will match the matrox implementation. + */ +/* + * sa1100fb_blank(): + * Blank the display by setting all palette values to zero. Note, the + * 12 and 16 bpp modes don't really use the palette, so this will not + * blank the display in all modes. + */ +static int sa1100fb_blank(int blank, struct fb_info *info) +{ + struct sa1100fb_info *fbi = + container_of(info, struct sa1100fb_info, fb); + int i; + + dev_dbg(fbi->dev, "sa1100fb_blank: blank=%d\n", blank); + + switch (blank) { + case FB_BLANK_POWERDOWN: + case FB_BLANK_VSYNC_SUSPEND: + case FB_BLANK_HSYNC_SUSPEND: + case FB_BLANK_NORMAL: + if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR || + fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) + for (i = 0; i < fbi->palette_size; i++) + sa1100fb_setpalettereg(i, 0, 0, 0, 0, info); + sa1100fb_schedule_work(fbi, C_DISABLE); + break; + + case FB_BLANK_UNBLANK: + if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR || + fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR) + fb_set_cmap(&fbi->fb.cmap, info); + sa1100fb_schedule_work(fbi, C_ENABLE); + } + return 0; +} + +static int sa1100fb_mmap(struct fb_info *info, + struct vm_area_struct *vma) +{ + struct sa1100fb_info *fbi = + container_of(info, struct sa1100fb_info, fb); + unsigned long off = vma->vm_pgoff << PAGE_SHIFT; + + if (off < info->fix.smem_len) { + vma->vm_pgoff += 1; /* skip over the palette */ + return dma_mmap_wc(fbi->dev, vma, fbi->map_cpu, fbi->map_dma, + fbi->map_size); + } + + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + + return vm_iomap_memory(vma, info->fix.mmio_start, info->fix.mmio_len); +} + +static const struct fb_ops sa1100fb_ops = { + .owner = THIS_MODULE, + .fb_check_var = sa1100fb_check_var, + .fb_set_par = sa1100fb_set_par, +// .fb_set_cmap = sa1100fb_set_cmap, + .fb_setcolreg = sa1100fb_setcolreg, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, + .fb_blank = sa1100fb_blank, + .fb_mmap = sa1100fb_mmap, +}; + +/* + * Calculate the PCD value from the clock rate (in picoseconds). + * We take account of the PPCR clock setting. + */ +static inline unsigned int get_pcd(struct sa1100fb_info *fbi, + unsigned int pixclock) +{ + unsigned int pcd = clk_get_rate(fbi->clk) / 100 / 1000; + + pcd *= pixclock; + pcd /= 10000000; + + return pcd + 1; /* make up for integer math truncations */ +} + +/* + * sa1100fb_activate_var(): + * Configures LCD Controller based on entries in var parameter. Settings are + * only written to the controller if changes were made. + */ +static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_info *fbi) +{ + struct sa1100fb_lcd_reg new_regs; + u_int half_screen_size, yres, pcd; + u_long flags; + + dev_dbg(fbi->dev, "Configuring SA1100 LCD\n"); + + dev_dbg(fbi->dev, "var: xres=%d hslen=%d lm=%d rm=%d\n", + var->xres, var->hsync_len, + var->left_margin, var->right_margin); + dev_dbg(fbi->dev, "var: yres=%d vslen=%d um=%d bm=%d\n", + var->yres, var->vsync_len, + var->upper_margin, var->lower_margin); + +#if DEBUG_VAR + if (var->xres < 16 || var->xres > 1024) + dev_err(fbi->dev, "%s: invalid xres %d\n", + fbi->fb.fix.id, var->xres); + if (var->hsync_len < 1 || var->hsync_len > 64) + dev_err(fbi->dev, "%s: invalid hsync_len %d\n", + fbi->fb.fix.id, var->hsync_len); + if (var->left_margin < 1 || var->left_margin > 255) + dev_err(fbi->dev, "%s: invalid left_margin %d\n", + fbi->fb.fix.id, var->left_margin); + if (var->right_margin < 1 || var->right_margin > 255) + dev_err(fbi->dev, "%s: invalid right_margin %d\n", + fbi->fb.fix.id, var->right_margin); + if (var->yres < 1 || var->yres > 1024) + dev_err(fbi->dev, "%s: invalid yres %d\n", + fbi->fb.fix.id, var->yres); + if (var->vsync_len < 1 || var->vsync_len > 64) + dev_err(fbi->dev, "%s: invalid vsync_len %d\n", + fbi->fb.fix.id, var->vsync_len); + if (var->upper_margin < 0 || var->upper_margin > 255) + dev_err(fbi->dev, "%s: invalid upper_margin %d\n", + fbi->fb.fix.id, var->upper_margin); + if (var->lower_margin < 0 || var->lower_margin > 255) + dev_err(fbi->dev, "%s: invalid lower_margin %d\n", + fbi->fb.fix.id, var->lower_margin); +#endif + + new_regs.lccr0 = fbi->inf->lccr0 | + LCCR0_LEN | LCCR0_LDM | LCCR0_BAM | + LCCR0_ERM | LCCR0_LtlEnd | LCCR0_DMADel(0); + + new_regs.lccr1 = + LCCR1_DisWdth(var->xres) + + LCCR1_HorSnchWdth(var->hsync_len) + + LCCR1_BegLnDel(var->left_margin) + + LCCR1_EndLnDel(var->right_margin); + + /* + * If we have a dual scan LCD, then we need to halve + * the YRES parameter. + */ + yres = var->yres; + if (fbi->inf->lccr0 & LCCR0_Dual) + yres /= 2; + + new_regs.lccr2 = + LCCR2_DisHght(yres) + + LCCR2_VrtSnchWdth(var->vsync_len) + + LCCR2_BegFrmDel(var->upper_margin) + + LCCR2_EndFrmDel(var->lower_margin); + + pcd = get_pcd(fbi, var->pixclock); + new_regs.lccr3 = LCCR3_PixClkDiv(pcd) | fbi->inf->lccr3 | + (var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) | + (var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL); + + dev_dbg(fbi->dev, "nlccr0 = 0x%08lx\n", new_regs.lccr0); + dev_dbg(fbi->dev, "nlccr1 = 0x%08lx\n", new_regs.lccr1); + dev_dbg(fbi->dev, "nlccr2 = 0x%08lx\n", new_regs.lccr2); + dev_dbg(fbi->dev, "nlccr3 = 0x%08lx\n", new_regs.lccr3); + + half_screen_size = var->bits_per_pixel; + half_screen_size = half_screen_size * var->xres * var->yres / 16; + + /* Update shadow copy atomically */ + local_irq_save(flags); + fbi->dbar1 = fbi->palette_dma; + fbi->dbar2 = fbi->screen_dma + half_screen_size; + + fbi->reg_lccr0 = new_regs.lccr0; + fbi->reg_lccr1 = new_regs.lccr1; + fbi->reg_lccr2 = new_regs.lccr2; + fbi->reg_lccr3 = new_regs.lccr3; + local_irq_restore(flags); + + /* + * Only update the registers if the controller is enabled + * and something has changed. + */ + if (readl_relaxed(fbi->base + LCCR0) != fbi->reg_lccr0 || + readl_relaxed(fbi->base + LCCR1) != fbi->reg_lccr1 || + readl_relaxed(fbi->base + LCCR2) != fbi->reg_lccr2 || + readl_relaxed(fbi->base + LCCR3) != fbi->reg_lccr3 || + readl_relaxed(fbi->base + DBAR1) != fbi->dbar1 || + readl_relaxed(fbi->base + DBAR2) != fbi->dbar2) + sa1100fb_schedule_work(fbi, C_REENABLE); + + return 0; +} + +/* + * NOTE! The following functions are purely helpers for set_ctrlr_state. + * Do not call them directly; set_ctrlr_state does the correct serialisation + * to ensure that things happen in the right way 100% of time time. + * -- rmk + */ +static inline void __sa1100fb_backlight_power(struct sa1100fb_info *fbi, int on) +{ + dev_dbg(fbi->dev, "backlight o%s\n", on ? "n" : "ff"); + + if (fbi->inf->backlight_power) + fbi->inf->backlight_power(on); +} + +static inline void __sa1100fb_lcd_power(struct sa1100fb_info *fbi, int on) +{ + dev_dbg(fbi->dev, "LCD power o%s\n", on ? "n" : "ff"); + + if (fbi->inf->lcd_power) + fbi->inf->lcd_power(on); +} + +static void sa1100fb_setup_gpio(struct sa1100fb_info *fbi) +{ + u_int mask = 0; + + /* + * Enable GPIO<9:2> for LCD use if: + * 1. Active display, or + * 2. Color Dual Passive display + * + * see table 11.8 on page 11-27 in the SA1100 manual + * -- Erik. + * + * SA1110 spec update nr. 25 says we can and should + * clear LDD15 to 12 for 4 or 8bpp modes with active + * panels. + */ + if ((fbi->reg_lccr0 & LCCR0_CMS) == LCCR0_Color && + (fbi->reg_lccr0 & (LCCR0_Dual|LCCR0_Act)) != 0) { + mask = GPIO_LDD11 | GPIO_LDD10 | GPIO_LDD9 | GPIO_LDD8; + + if (fbi->fb.var.bits_per_pixel > 8 || + (fbi->reg_lccr0 & (LCCR0_Dual|LCCR0_Act)) == LCCR0_Dual) + mask |= GPIO_LDD15 | GPIO_LDD14 | GPIO_LDD13 | GPIO_LDD12; + + } + + if (mask) { + unsigned long flags; + + /* + * SA-1100 requires the GPIO direction register set + * appropriately for the alternate function. Hence + * we set it here via bitmask rather than excessive + * fiddling via the GPIO subsystem - and even then + * we'll still have to deal with GAFR. + */ + local_irq_save(flags); + GPDR |= mask; + GAFR |= mask; + local_irq_restore(flags); + } +} + +static void sa1100fb_enable_controller(struct sa1100fb_info *fbi) +{ + dev_dbg(fbi->dev, "Enabling LCD controller\n"); + + /* + * Make sure the mode bits are present in the first palette entry + */ + fbi->palette_cpu[0] &= 0xcfff; + fbi->palette_cpu[0] |= palette_pbs(&fbi->fb.var); + + /* enable LCD controller clock */ + clk_prepare_enable(fbi->clk); + + /* Sequence from 11.7.10 */ + writel_relaxed(fbi->reg_lccr3, fbi->base + LCCR3); + writel_relaxed(fbi->reg_lccr2, fbi->base + LCCR2); + writel_relaxed(fbi->reg_lccr1, fbi->base + LCCR1); + writel_relaxed(fbi->reg_lccr0 & ~LCCR0_LEN, fbi->base + LCCR0); + writel_relaxed(fbi->dbar1, fbi->base + DBAR1); + writel_relaxed(fbi->dbar2, fbi->base + DBAR2); + writel_relaxed(fbi->reg_lccr0 | LCCR0_LEN, fbi->base + LCCR0); + + if (fbi->shannon_lcden) + gpiod_set_value(fbi->shannon_lcden, 1); + + dev_dbg(fbi->dev, "DBAR1: 0x%08x\n", readl_relaxed(fbi->base + DBAR1)); + dev_dbg(fbi->dev, "DBAR2: 0x%08x\n", readl_relaxed(fbi->base + DBAR2)); + dev_dbg(fbi->dev, "LCCR0: 0x%08x\n", readl_relaxed(fbi->base + LCCR0)); + dev_dbg(fbi->dev, "LCCR1: 0x%08x\n", readl_relaxed(fbi->base + LCCR1)); + dev_dbg(fbi->dev, "LCCR2: 0x%08x\n", readl_relaxed(fbi->base + LCCR2)); + dev_dbg(fbi->dev, "LCCR3: 0x%08x\n", readl_relaxed(fbi->base + LCCR3)); +} + +static void sa1100fb_disable_controller(struct sa1100fb_info *fbi) +{ + DECLARE_WAITQUEUE(wait, current); + u32 lccr0; + + dev_dbg(fbi->dev, "Disabling LCD controller\n"); + + if (fbi->shannon_lcden) + gpiod_set_value(fbi->shannon_lcden, 0); + + set_current_state(TASK_UNINTERRUPTIBLE); + add_wait_queue(&fbi->ctrlr_wait, &wait); + + /* Clear LCD Status Register */ + writel_relaxed(~0, fbi->base + LCSR); + + lccr0 = readl_relaxed(fbi->base + LCCR0); + lccr0 &= ~LCCR0_LDM; /* Enable LCD Disable Done Interrupt */ + writel_relaxed(lccr0, fbi->base + LCCR0); + lccr0 &= ~LCCR0_LEN; /* Disable LCD Controller */ + writel_relaxed(lccr0, fbi->base + LCCR0); + + schedule_timeout(20 * HZ / 1000); + remove_wait_queue(&fbi->ctrlr_wait, &wait); + + /* disable LCD controller clock */ + clk_disable_unprepare(fbi->clk); +} + +/* + * sa1100fb_handle_irq: Handle 'LCD DONE' interrupts. + */ +static irqreturn_t sa1100fb_handle_irq(int irq, void *dev_id) +{ + struct sa1100fb_info *fbi = dev_id; + unsigned int lcsr = readl_relaxed(fbi->base + LCSR); + + if (lcsr & LCSR_LDD) { + u32 lccr0 = readl_relaxed(fbi->base + LCCR0) | LCCR0_LDM; + writel_relaxed(lccr0, fbi->base + LCCR0); + wake_up(&fbi->ctrlr_wait); + } + + writel_relaxed(lcsr, fbi->base + LCSR); + return IRQ_HANDLED; +} + +/* + * This function must be called from task context only, since it will + * sleep when disabling the LCD controller, or if we get two contending + * processes trying to alter state. + */ +static void set_ctrlr_state(struct sa1100fb_info *fbi, u_int state) +{ + u_int old_state; + + mutex_lock(&fbi->ctrlr_lock); + + old_state = fbi->state; + + /* + * Hack around fbcon initialisation. + */ + if (old_state == C_STARTUP && state == C_REENABLE) + state = C_ENABLE; + + switch (state) { + case C_DISABLE_CLKCHANGE: + /* + * Disable controller for clock change. If the + * controller is already disabled, then do nothing. + */ + if (old_state != C_DISABLE && old_state != C_DISABLE_PM) { + fbi->state = state; + sa1100fb_disable_controller(fbi); + } + break; + + case C_DISABLE_PM: + case C_DISABLE: + /* + * Disable controller + */ + if (old_state != C_DISABLE) { + fbi->state = state; + + __sa1100fb_backlight_power(fbi, 0); + if (old_state != C_DISABLE_CLKCHANGE) + sa1100fb_disable_controller(fbi); + __sa1100fb_lcd_power(fbi, 0); + } + break; + + case C_ENABLE_CLKCHANGE: + /* + * Enable the controller after clock change. Only + * do this if we were disabled for the clock change. + */ + if (old_state == C_DISABLE_CLKCHANGE) { + fbi->state = C_ENABLE; + sa1100fb_enable_controller(fbi); + } + break; + + case C_REENABLE: + /* + * Re-enable the controller only if it was already + * enabled. This is so we reprogram the control + * registers. + */ + if (old_state == C_ENABLE) { + sa1100fb_disable_controller(fbi); + sa1100fb_setup_gpio(fbi); + sa1100fb_enable_controller(fbi); + } + break; + + case C_ENABLE_PM: + /* + * Re-enable the controller after PM. This is not + * perfect - think about the case where we were doing + * a clock change, and we suspended half-way through. + */ + if (old_state != C_DISABLE_PM) + break; + fallthrough; + + case C_ENABLE: + /* + * Power up the LCD screen, enable controller, and + * turn on the backlight. + */ + if (old_state != C_ENABLE) { + fbi->state = C_ENABLE; + sa1100fb_setup_gpio(fbi); + __sa1100fb_lcd_power(fbi, 1); + sa1100fb_enable_controller(fbi); + __sa1100fb_backlight_power(fbi, 1); + } + break; + } + mutex_unlock(&fbi->ctrlr_lock); +} + +/* + * Our LCD controller task (which is called when we blank or unblank) + * via keventd. + */ +static void sa1100fb_task(struct work_struct *w) +{ + struct sa1100fb_info *fbi = container_of(w, struct sa1100fb_info, task); + u_int state = xchg(&fbi->task_state, -1); + + set_ctrlr_state(fbi, state); +} + +#ifdef CONFIG_CPU_FREQ +/* + * CPU clock speed change handler. We need to adjust the LCD timing + * parameters when the CPU clock is adjusted by the power management + * subsystem. + */ +static int +sa1100fb_freq_transition(struct notifier_block *nb, unsigned long val, + void *data) +{ + struct sa1100fb_info *fbi = TO_INF(nb, freq_transition); + u_int pcd; + + switch (val) { + case CPUFREQ_PRECHANGE: + set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE); + break; + + case CPUFREQ_POSTCHANGE: + pcd = get_pcd(fbi, fbi->fb.var.pixclock); + fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd); + set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE); + break; + } + return 0; +} +#endif + +#ifdef CONFIG_PM +/* + * Power management hooks. Note that we won't be called from IRQ context, + * unlike the blank functions above, so we may sleep. + */ +static int sa1100fb_suspend(struct platform_device *dev, pm_message_t state) +{ + struct sa1100fb_info *fbi = platform_get_drvdata(dev); + + set_ctrlr_state(fbi, C_DISABLE_PM); + return 0; +} + +static int sa1100fb_resume(struct platform_device *dev) +{ + struct sa1100fb_info *fbi = platform_get_drvdata(dev); + + set_ctrlr_state(fbi, C_ENABLE_PM); + return 0; +} +#else +#define sa1100fb_suspend NULL +#define sa1100fb_resume NULL +#endif + +/* + * sa1100fb_map_video_memory(): + * Allocates the DRAM memory for the frame buffer. This buffer is + * remapped into a non-cached, non-buffered, memory region to + * allow palette and pixel writes to occur without flushing the + * cache. Once this area is remapped, all virtual memory + * access to the video memory should occur at the new region. + */ +static int sa1100fb_map_video_memory(struct sa1100fb_info *fbi) +{ + /* + * We reserve one page for the palette, plus the size + * of the framebuffer. + */ + fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE); + fbi->map_cpu = dma_alloc_wc(fbi->dev, fbi->map_size, &fbi->map_dma, + GFP_KERNEL); + + if (fbi->map_cpu) { + fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE; + fbi->screen_dma = fbi->map_dma + PAGE_SIZE; + /* + * FIXME: this is actually the wrong thing to place in + * smem_start. But fbdev suffers from the problem that + * it needs an API which doesn't exist (in this case, + * dma_writecombine_mmap) + */ + fbi->fb.fix.smem_start = fbi->screen_dma; + } + + return fbi->map_cpu ? 0 : -ENOMEM; +} + +/* Fake monspecs to fill in fbinfo structure */ +static const struct fb_monspecs monspecs = { + .hfmin = 30000, + .hfmax = 70000, + .vfmin = 50, + .vfmax = 65, +}; + + +static struct sa1100fb_info *sa1100fb_init_fbinfo(struct device *dev) +{ + struct sa1100fb_mach_info *inf = dev_get_platdata(dev); + struct sa1100fb_info *fbi; + unsigned i; + + fbi = devm_kzalloc(dev, sizeof(struct sa1100fb_info), GFP_KERNEL); + if (!fbi) + return NULL; + + fbi->dev = dev; + + strcpy(fbi->fb.fix.id, SA1100_NAME); + + fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS; + fbi->fb.fix.type_aux = 0; + fbi->fb.fix.xpanstep = 0; + fbi->fb.fix.ypanstep = 0; + fbi->fb.fix.ywrapstep = 0; + fbi->fb.fix.accel = FB_ACCEL_NONE; + + fbi->fb.var.nonstd = 0; + fbi->fb.var.activate = FB_ACTIVATE_NOW; + fbi->fb.var.height = -1; + fbi->fb.var.width = -1; + fbi->fb.var.accel_flags = 0; + fbi->fb.var.vmode = FB_VMODE_NONINTERLACED; + + fbi->fb.fbops = &sa1100fb_ops; + fbi->fb.flags = FBINFO_DEFAULT; + fbi->fb.monspecs = monspecs; + fbi->fb.pseudo_palette = fbi->pseudo_palette; + + fbi->rgb[RGB_4] = &rgb_4; + fbi->rgb[RGB_8] = &rgb_8; + fbi->rgb[RGB_16] = &def_rgb_16; + + /* + * People just don't seem to get this. We don't support + * anything but correct entries now, so panic if someone + * does something stupid. + */ + if (inf->lccr3 & (LCCR3_VrtSnchL|LCCR3_HorSnchL|0xff) || + inf->pixclock == 0) + panic("sa1100fb error: invalid LCCR3 fields set or zero " + "pixclock."); + + fbi->fb.var.xres = inf->xres; + fbi->fb.var.xres_virtual = inf->xres; + fbi->fb.var.yres = inf->yres; + fbi->fb.var.yres_virtual = inf->yres; + fbi->fb.var.bits_per_pixel = inf->bpp; + fbi->fb.var.pixclock = inf->pixclock; + fbi->fb.var.hsync_len = inf->hsync_len; + fbi->fb.var.left_margin = inf->left_margin; + fbi->fb.var.right_margin = inf->right_margin; + fbi->fb.var.vsync_len = inf->vsync_len; + fbi->fb.var.upper_margin = inf->upper_margin; + fbi->fb.var.lower_margin = inf->lower_margin; + fbi->fb.var.sync = inf->sync; + fbi->fb.var.grayscale = inf->cmap_greyscale; + fbi->state = C_STARTUP; + fbi->task_state = (u_char)-1; + fbi->fb.fix.smem_len = inf->xres * inf->yres * + inf->bpp / 8; + fbi->inf = inf; + + /* Copy the RGB bitfield overrides */ + for (i = 0; i < NR_RGB; i++) + if (inf->rgb[i]) + fbi->rgb[i] = inf->rgb[i]; + + init_waitqueue_head(&fbi->ctrlr_wait); + INIT_WORK(&fbi->task, sa1100fb_task); + mutex_init(&fbi->ctrlr_lock); + + return fbi; +} + +static int sa1100fb_probe(struct platform_device *pdev) +{ + struct sa1100fb_info *fbi; + int ret, irq; + + if (!dev_get_platdata(&pdev->dev)) { + dev_err(&pdev->dev, "no platform LCD data\n"); + return -EINVAL; + } + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return -EINVAL; + + fbi = sa1100fb_init_fbinfo(&pdev->dev); + if (!fbi) + return -ENOMEM; + + fbi->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(fbi->base)) + return PTR_ERR(fbi->base); + + fbi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(fbi->clk)) + return PTR_ERR(fbi->clk); + + ret = devm_request_irq(&pdev->dev, irq, sa1100fb_handle_irq, 0, + "LCD", fbi); + if (ret) { + dev_err(&pdev->dev, "request_irq failed: %d\n", ret); + return ret; + } + + fbi->shannon_lcden = gpiod_get_optional(&pdev->dev, "shannon-lcden", + GPIOD_OUT_LOW); + if (IS_ERR(fbi->shannon_lcden)) + return PTR_ERR(fbi->shannon_lcden); + + /* Initialize video memory */ + ret = sa1100fb_map_video_memory(fbi); + if (ret) + return ret; + + /* + * This makes sure that our colour bitfield + * descriptors are correctly initialised. + */ + sa1100fb_check_var(&fbi->fb.var, &fbi->fb); + + platform_set_drvdata(pdev, fbi); + + ret = register_framebuffer(&fbi->fb); + if (ret < 0) { + dma_free_wc(fbi->dev, fbi->map_size, fbi->map_cpu, + fbi->map_dma); + return ret; + } + +#ifdef CONFIG_CPU_FREQ + fbi->freq_transition.notifier_call = sa1100fb_freq_transition; + cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER); +#endif + + /* This driver cannot be unloaded at the moment */ + return 0; +} + +static struct platform_driver sa1100fb_driver = { + .probe = sa1100fb_probe, + .suspend = sa1100fb_suspend, + .resume = sa1100fb_resume, + .driver = { + .name = "sa11x0-fb", + }, +}; + +int __init sa1100fb_init(void) +{ + if (fb_get_options("sa1100fb", NULL)) + return -ENODEV; + + return platform_driver_register(&sa1100fb_driver); +} + +module_init(sa1100fb_init); +MODULE_DESCRIPTION("StrongARM-1100/1110 framebuffer driver"); +MODULE_LICENSE("GPL"); |