From 72330b0eeefc7abda35b5af55d0e2a9a3d05f04c Mon Sep 17 00:00:00 2001 From: Juergen Beisert Date: Tue, 16 Dec 2008 11:44:07 +0100 Subject: i.MX Framebuffer: Use readl/writel instead of direct pointer deref This patch prepares the current i.MX1 framebuffer driver for usage in the whole i.MX family. It switches to readl/writel for register accesses. Also it moves the register definitions to the driver where they belong. Acked-by: Krzysztof Helt Signed-off-by: Juergen Beisert Signed-off-by: Sascha Hauer --- drivers/video/imxfb.c | 193 +++++++++++++++++++++++++++++++++----------------- drivers/video/imxfb.h | 3 +- 2 files changed, 130 insertions(+), 66 deletions(-) (limited to 'drivers/video') diff --git a/drivers/video/imxfb.c b/drivers/video/imxfb.c index a990d432f524..1bccf5ad0c7d 100644 --- a/drivers/video/imxfb.c +++ b/drivers/video/imxfb.c @@ -16,7 +16,6 @@ * linux-arm-kernel@lists.arm.linux.org.uk */ -//#define DEBUG 1 #include #include @@ -32,9 +31,8 @@ #include #include #include +#include -#include -#include #include /* @@ -44,6 +42,73 @@ #include "imxfb.h" +#define DRIVER_NAME "imx-fb" + +#define LCDC_SSA 0x00 + +#define LCDC_SIZE 0x04 +#define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20) +#define SIZE_YMAX(y) ((y) & 0x1ff) + +#define LCDC_VPW 0x08 +#define VPW_VPW(x) ((x) & 0x3ff) + +#define LCDC_CPOS 0x0C +#define CPOS_CC1 (1<<31) +#define CPOS_CC0 (1<<30) +#define CPOS_OP (1<<28) +#define CPOS_CXP(x) (((x) & 3ff) << 16) +#define CPOS_CYP(y) ((y) & 0x1ff) + +#define LCDC_LCWHB 0x10 +#define LCWHB_BK_EN (1<<31) +#define LCWHB_CW(w) (((w) & 0x1f) << 24) +#define LCWHB_CH(h) (((h) & 0x1f) << 16) +#define LCWHB_BD(x) ((x) & 0xff) + +#define LCDC_LCHCC 0x14 +#define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11) +#define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5) +#define LCHCC_CUR_COL_B(b) ((b) & 0x1f) + +#define LCDC_PCR 0x18 + +#define LCDC_HCR 0x1C +#define HCR_H_WIDTH(x) (((x) & 0x3f) << 26) +#define HCR_H_WAIT_1(x) (((x) & 0xff) << 8) +#define HCR_H_WAIT_2(x) ((x) & 0xff) + +#define LCDC_VCR 0x20 +#define VCR_V_WIDTH(x) (((x) & 0x3f) << 26) +#define VCR_V_WAIT_1(x) (((x) & 0xff) << 8) +#define VCR_V_WAIT_2(x) ((x) & 0xff) + +#define LCDC_POS 0x24 +#define POS_POS(x) ((x) & 1f) + +#define LCDC_LSCR1 0x28 +/* bit fields in imxfb.h */ + +#define LCDC_PWMR 0x2C +/* bit fields in imxfb.h */ + +#define LCDC_DMACR 0x30 +/* bit fields in imxfb.h */ + +#define LCDC_RMCR 0x34 +#define RMCR_LCDC_EN (1<<1) +#define RMCR_SELF_REF (1<<0) + +#define LCDC_LCDICR 0x38 +#define LCDICR_INT_SYN (1<<2) +#define LCDICR_INT_CON (1) + +#define LCDC_LCDISR 0x40 +#define LCDISR_UDR_ERR (1<<3) +#define LCDISR_ERR_RES (1<<2) +#define LCDISR_EOF (1<<1) +#define LCDISR_BOF (1<<0) + static struct imxfb_rgb def_rgb_16 = { .red = { .offset = 8, .length = 4, }, .green = { .offset = 4, .length = 4, }, @@ -67,7 +132,6 @@ static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) return chan << bf->offset; } -#define LCDC_PALETTE(x) __REG2(IMX_LCDC_BASE+0x800, (x)<<2) static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue, u_int trans, struct fb_info *info) @@ -81,7 +145,7 @@ imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue, (CNVT_TOHW(green,4) << 4) | CNVT_TOHW(blue, 4); - LCDC_PALETTE(regno) = val; + writel(val, fbi->regs + 0x800 + (regno << 2)); ret = 0; } return ret; @@ -235,18 +299,23 @@ static void imxfb_enable_controller(struct imxfb_info *fbi) pr_debug("Enabling LCD controller\n"); /* initialize LCDC */ - LCDC_RMCR &= ~RMCR_LCDC_EN; /* just to be safe... */ + writel(readl(fbi->regs + LCDC_RMCR) & ~RMCR_LCDC_EN, + fbi->regs + LCDC_RMCR); /* just to be safe... */ + + writel(fbi->screen_dma, fbi->regs + LCDC_SSA); - LCDC_SSA = fbi->screen_dma; /* physical screen start address */ - LCDC_VPW = VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4); + writel(VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4), + fbi->regs + LCDC_VPW); - LCDC_POS = 0x00000000; /* panning offset 0 (0 pixel offset) */ + /* panning offset 0 (0 pixel offset) */ + writel(0x00000000, fbi->regs + LCDC_POS); /* disable hardware cursor */ - LCDC_CPOS &= ~(CPOS_CC0 | CPOS_CC1); + writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1), + fbi->regs + LCDC_CPOS); - LCDC_RMCR = RMCR_LCDC_EN; + writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR); if(fbi->backlight_power) fbi->backlight_power(1); @@ -263,7 +332,7 @@ static void imxfb_disable_controller(struct imxfb_info *fbi) if(fbi->lcd_power) fbi->lcd_power(0); - LCDC_RMCR = 0; + writel(0, fbi->regs + LCDC_RMCR); } static int imxfb_blank(int blank, struct fb_info *info) @@ -340,19 +409,22 @@ static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *inf info->fix.id, var->lower_margin); #endif - LCDC_HCR = HCR_H_WIDTH(var->hsync_len) | - HCR_H_WAIT_1(var->left_margin) | - HCR_H_WAIT_2(var->right_margin); + writel(HCR_H_WIDTH(var->hsync_len) | + HCR_H_WAIT_1(var->left_margin) | + HCR_H_WAIT_2(var->right_margin), + fbi->regs + LCDC_HCR); - LCDC_VCR = VCR_V_WIDTH(var->vsync_len) | - VCR_V_WAIT_1(var->upper_margin) | - VCR_V_WAIT_2(var->lower_margin); + writel(VCR_V_WIDTH(var->vsync_len) | + VCR_V_WAIT_1(var->upper_margin) | + VCR_V_WAIT_2(var->lower_margin), + fbi->regs + LCDC_VCR); - LCDC_SIZE = SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres); - LCDC_PCR = fbi->pcr; - LCDC_PWMR = fbi->pwmr; - LCDC_LSCR1 = fbi->lscr1; - LCDC_DMACR = fbi->dmacr; + writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres), + fbi->regs + LCDC_SIZE); + writel(fbi->pcr, fbi->regs + LCDC_PCR); + writel(fbi->pwmr, fbi->regs + LCDC_PWMR); + writel(fbi->lscr1, fbi->regs + LCDC_LSCR1); + writel(fbi->dmacr, fbi->regs + LCDC_DMACR); return 0; } @@ -384,10 +456,10 @@ static int imxfb_resume(struct platform_device *dev) #define imxfb_resume NULL #endif -static int __init imxfb_init_fbinfo(struct device *dev) +static int __init imxfb_init_fbinfo(struct platform_device *pdev) { - struct imxfb_mach_info *inf = dev->platform_data; - struct fb_info *info = dev_get_drvdata(dev); + struct imxfb_mach_info *inf = pdev->dev.platform_data; + struct fb_info *info = dev_get_drvdata(&pdev->dev); struct imxfb_info *fbi = info->par; pr_debug("%s\n",__func__); @@ -397,7 +469,6 @@ static int __init imxfb_init_fbinfo(struct device *dev) return -ENOMEM; memset(fbi, 0, sizeof(struct imxfb_info)); - fbi->dev = dev; strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id)); @@ -453,31 +524,6 @@ static int __init imxfb_init_fbinfo(struct device *dev) return 0; } -/* - * Allocates the DRAM memory for the frame buffer. This buffer is - * remapped into a non-cached, non-buffered, memory region to - * allow 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 __init imxfb_map_video_memory(struct fb_info *info) -{ - struct imxfb_info *fbi = info->par; - - fbi->map_size = PAGE_ALIGN(info->fix.smem_len); - fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size, - &fbi->map_dma,GFP_KERNEL); - - if (fbi->map_cpu) { - info->screen_base = fbi->map_cpu; - fbi->screen_cpu = fbi->map_cpu; - fbi->screen_dma = fbi->map_dma; - info->fix.smem_start = fbi->screen_dma; - } - - return fbi->map_cpu ? 0 : -ENOMEM; -} - static int __init imxfb_probe(struct platform_device *pdev) { struct imxfb_info *fbi; @@ -506,23 +552,38 @@ static int __init imxfb_probe(struct platform_device *pdev) platform_set_drvdata(pdev, info); - ret = imxfb_init_fbinfo(&pdev->dev); + ret = imxfb_init_fbinfo(pdev); if( ret < 0 ) goto failed_init; - res = request_mem_region(res->start, res->end - res->start + 1, "IMXFB"); + res = request_mem_region(res->start, resource_size(res), + DRIVER_NAME); if (!res) { ret = -EBUSY; - goto failed_regs; + goto failed_req; + } + + fbi->regs = ioremap(res->start, resource_size(res)); + if (fbi->regs == NULL) { + printk(KERN_ERR"Cannot map frame buffer registers\n"); + goto failed_ioremap; } if (!inf->fixed_screen_cpu) { - ret = imxfb_map_video_memory(info); - if (ret) { + fbi->map_size = PAGE_ALIGN(info->fix.smem_len); + fbi->map_cpu = dma_alloc_writecombine(&pdev->dev, + fbi->map_size, &fbi->map_dma, GFP_KERNEL); + + if (!fbi->map_cpu) { dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret); ret = -ENOMEM; goto failed_map; } + + info->screen_base = fbi->map_cpu; + fbi->screen_cpu = fbi->map_cpu; + fbi->screen_dma = fbi->map_dma; + info->fix.smem_start = fbi->screen_dma; } else { /* Fixed framebuffer mapping enables location of the screen in eSRAM */ fbi->map_cpu = inf->fixed_screen_cpu; @@ -559,18 +620,20 @@ failed_register: failed_cmap: if (!inf->fixed_screen_cpu) dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu, - fbi->map_dma); + fbi->map_dma); failed_map: - kfree(info->pseudo_palette); -failed_regs: + iounmap(fbi->regs); +failed_ioremap: release_mem_region(res->start, res->end - res->start); +failed_req: + kfree(info->pseudo_palette); failed_init: platform_set_drvdata(pdev, NULL); framebuffer_release(info); return ret; } -static int imxfb_remove(struct platform_device *pdev) +static int __devexit imxfb_remove(struct platform_device *pdev) { struct fb_info *info = platform_get_drvdata(pdev); struct imxfb_info *fbi = info->par; @@ -586,6 +649,7 @@ static int imxfb_remove(struct platform_device *pdev) kfree(info->pseudo_palette); framebuffer_release(info); + iounmap(fbi->regs); release_mem_region(res->start, res->end - res->start + 1); platform_set_drvdata(pdev, NULL); @@ -600,19 +664,18 @@ void imxfb_shutdown(struct platform_device * dev) } static struct platform_driver imxfb_driver = { - .probe = imxfb_probe, .suspend = imxfb_suspend, .resume = imxfb_resume, - .remove = imxfb_remove, + .remove = __devexit_p(imxfb_remove), .shutdown = imxfb_shutdown, .driver = { - .name = "imx-fb", + .name = DRIVER_NAME, }, }; int __init imxfb_init(void) { - return platform_driver_register(&imxfb_driver); + return platform_driver_probe(&imxfb_driver, imxfb_probe); } static void __exit imxfb_cleanup(void) diff --git a/drivers/video/imxfb.h b/drivers/video/imxfb.h index e837a8b48eb8..baa86a0fe29e 100644 --- a/drivers/video/imxfb.h +++ b/drivers/video/imxfb.h @@ -29,7 +29,8 @@ struct imxfb_rgb { #define NR_RGB 2 struct imxfb_info { - struct device *dev; + void __iomem *regs; + struct imxfb_rgb *rgb[NR_RGB]; u_int max_bpp; -- cgit v1.2.3-59-g8ed1b