/* * linux/arch/arm/mach-nspire/clcd.c * * Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2, as * published by the Free Software Foundation. * */ #include <linux/init.h> #include <linux/of.h> #include <linux/amba/bus.h> #include <linux/amba/clcd.h> #include <linux/dma-mapping.h> static struct clcd_panel nspire_cx_lcd_panel = { .mode = { .name = "Color LCD", .refresh = 60, .xres = 320, .yres = 240, .sync = 0, .vmode = FB_VMODE_NONINTERLACED, .pixclock = 1, .hsync_len = 6, .vsync_len = 1, .right_margin = 50, .left_margin = 38, .lower_margin = 3, .upper_margin = 17, }, .width = 65, /* ~6.50 cm */ .height = 49, /* ~4.87 cm */ .tim2 = TIM2_IPC, .cntl = CNTL_LCDTFT | CNTL_LCDVCOMP(1), .bpp = 16, .caps = CLCD_CAP_565, }; static struct clcd_panel nspire_classic_lcd_panel = { .mode = { .name = "Grayscale LCD", .refresh = 60, .xres = 320, .yres = 240, .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, .vmode = FB_VMODE_NONINTERLACED, .pixclock = 1, .hsync_len = 6, .vsync_len = 1, .right_margin = 6, .left_margin = 6, }, .width = 71, /* 7.11cm */ .height = 53, /* 5.33cm */ .tim2 = 0x80007d0, .cntl = CNTL_LCDMONO8, .bpp = 8, .grayscale = 1, .caps = CLCD_CAP_5551, }; int nspire_clcd_setup(struct clcd_fb *fb) { struct clcd_panel *panel; size_t panel_size; const char *type; dma_addr_t dma; int err; BUG_ON(!fb->dev->dev.of_node); err = of_property_read_string(fb->dev->dev.of_node, "lcd-type", &type); if (err) { pr_err("CLCD: Could not find lcd-type property\n"); return err; } if (!strcmp(type, "cx")) { panel = &nspire_cx_lcd_panel; } else if (!strcmp(type, "classic")) { panel = &nspire_classic_lcd_panel; } else { pr_err("CLCD: Unknown lcd-type %s\n", type); return -EINVAL; } panel_size = ((panel->mode.xres * panel->mode.yres) * panel->bpp) / 8; panel_size = ALIGN(panel_size, PAGE_SIZE); fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, panel_size, &dma, GFP_KERNEL); if (!fb->fb.screen_base) { pr_err("CLCD: unable to map framebuffer\n"); return -ENOMEM; } fb->fb.fix.smem_start = dma; fb->fb.fix.smem_len = panel_size; fb->panel = panel; return 0; } int nspire_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma) { return dma_mmap_writecombine(&fb->dev->dev, vma, fb->fb.screen_base, fb->fb.fix.smem_start, fb->fb.fix.smem_len); } void nspire_clcd_remove(struct clcd_fb *fb) { dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len, fb->fb.screen_base, fb->fb.fix.smem_start); }