linux/drivers/video/fbdev/imxfb.c
Uwe Kleine-König 5c694f8094 video: fbdev: imxfb: ensure balanced regulator usage
The fbdev framework doesn't care to call the .set_power callback only on
changes. So the driver has to care for itself that the regulator doesn't
get disabled more often than enabled.

This fixes the regulator warning

	unbalanced disables for lcd supply

which can be triggered by doing

	echo 4 > /sys/class/lcd/imxfb-lcd/lcd_power

twice.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200323211626.24812-1-u.kleine-koenig@pengutronix.de
2020-04-17 15:50:07 +02:00

1141 lines
26 KiB
C

/*
* Freescale i.MX Frame Buffer device driver
*
* Copyright (C) 2004 Sascha Hauer, Pengutronix
* 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.
*
* Please direct your questions and comments on this driver to the following
* email address:
*
* linux-arm-kernel@lists.arm.linux.org.uk
*/
#include <linux/module.h>
#include <linux/kernel.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/clk.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/lcd.h>
#include <linux/math64.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
#include <linux/platform_data/video-imxfb.h>
/*
* Complain if VAR is out of range.
*/
#define DEBUG_VAR 1
#define DRIVER_NAME "imx-fb"
#define LCDC_SSA 0x00
#define LCDC_SIZE 0x04
#define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20)
#define YMAX_MASK_IMX1 0x1ff
#define YMAX_MASK_IMX21 0x3ff
#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 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 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_MX1 (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)
#define IMXFB_LSCR1_DEFAULT 0x00120300
#define LCDC_LAUSCR 0x80
#define LAUSCR_AUS_MODE (1<<31)
/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
static const char *fb_mode;
/*
* These are the bitfields for each
* display depth that we support.
*/
struct imxfb_rgb {
struct fb_bitfield red;
struct fb_bitfield green;
struct fb_bitfield blue;
struct fb_bitfield transp;
};
enum imxfb_type {
IMX1_FB,
IMX21_FB,
};
struct imxfb_info {
struct platform_device *pdev;
void __iomem *regs;
struct clk *clk_ipg;
struct clk *clk_ahb;
struct clk *clk_per;
enum imxfb_type devtype;
bool enabled;
/*
* These are the addresses we mapped
* the framebuffer memory region to.
*/
dma_addr_t map_dma;
u_int map_size;
u_int palette_size;
dma_addr_t dbar1;
dma_addr_t dbar2;
u_int pcr;
u_int lauscr;
u_int pwmr;
u_int lscr1;
u_int dmacr;
bool cmap_inverse;
bool cmap_static;
struct imx_fb_videomode *mode;
int num_modes;
struct regulator *lcd_pwr;
int lcd_pwr_enabled;
};
static const struct platform_device_id imxfb_devtype[] = {
{
.name = "imx1-fb",
.driver_data = IMX1_FB,
}, {
.name = "imx21-fb",
.driver_data = IMX21_FB,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, imxfb_devtype);
static const struct of_device_id imxfb_of_dev_id[] = {
{
.compatible = "fsl,imx1-fb",
.data = &imxfb_devtype[IMX1_FB],
}, {
.compatible = "fsl,imx21-fb",
.data = &imxfb_devtype[IMX21_FB],
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
static inline int is_imx1_fb(struct imxfb_info *fbi)
{
return fbi->devtype == IMX1_FB;
}
#define IMX_NAME "IMX"
/*
* Minimum X and Y resolutions
*/
#define MIN_XRES 64
#define MIN_YRES 64
/* Actually this really is 18bit support, the lowest 2 bits of each colour
* are unused in hardware. We claim to have 24bit support to make software
* like X work, which does not support 18bit.
*/
static struct imxfb_rgb def_rgb_18 = {
.red = {.offset = 16, .length = 8,},
.green = {.offset = 8, .length = 8,},
.blue = {.offset = 0, .length = 8,},
.transp = {.offset = 0, .length = 0,},
};
static struct imxfb_rgb def_rgb_16_tft = {
.red = {.offset = 11, .length = 5,},
.green = {.offset = 5, .length = 6,},
.blue = {.offset = 0, .length = 5,},
.transp = {.offset = 0, .length = 0,},
};
static struct imxfb_rgb def_rgb_16_stn = {
.red = {.offset = 8, .length = 4,},
.green = {.offset = 4, .length = 4,},
.blue = {.offset = 0, .length = 4,},
.transp = {.offset = 0, .length = 0,},
};
static struct imxfb_rgb def_rgb_8 = {
.red = {.offset = 0, .length = 8,},
.green = {.offset = 0, .length = 8,},
.blue = {.offset = 0, .length = 8,},
.transp = {.offset = 0, .length = 0,},
};
static int imxfb_activate_var(struct fb_var_screeninfo *var,
struct fb_info *info);
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 imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
u_int trans, struct fb_info *info)
{
struct imxfb_info *fbi = info->par;
u_int val, ret = 1;
#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
if (regno < fbi->palette_size) {
val = (CNVT_TOHW(red, 4) << 8) |
(CNVT_TOHW(green,4) << 4) |
CNVT_TOHW(blue, 4);
writel(val, fbi->regs + 0x800 + (regno << 2));
ret = 0;
}
return ret;
}
static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
u_int trans, struct fb_info *info)
{
struct imxfb_info *fbi = info->par;
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->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 (info->var.grayscale)
red = green = blue = (19595 * red + 38470 * green +
7471 * blue) >> 16;
switch (info->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) {
u32 *pal = info->pseudo_palette;
val = chan_to_field(red, &info->var.red);
val |= chan_to_field(green, &info->var.green);
val |= chan_to_field(blue, &info->var.blue);
pal[regno] = val;
ret = 0;
}
break;
case FB_VISUAL_STATIC_PSEUDOCOLOR:
case FB_VISUAL_PSEUDOCOLOR:
ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
break;
}
return ret;
}
static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
{
struct imx_fb_videomode *m;
int i;
if (!fb_mode)
return &fbi->mode[0];
for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
if (!strcmp(m->mode.name, fb_mode))
return m;
}
return NULL;
}
/*
* imxfb_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 imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
struct imxfb_info *fbi = info->par;
struct imxfb_rgb *rgb;
const struct imx_fb_videomode *imxfb_mode;
unsigned long lcd_clk;
unsigned long long tmp;
u32 pcr = 0;
if (var->xres < MIN_XRES)
var->xres = MIN_XRES;
if (var->yres < MIN_YRES)
var->yres = MIN_YRES;
imxfb_mode = imxfb_find_mode(fbi);
if (!imxfb_mode)
return -EINVAL;
var->xres = imxfb_mode->mode.xres;
var->yres = imxfb_mode->mode.yres;
var->bits_per_pixel = imxfb_mode->bpp;
var->pixclock = imxfb_mode->mode.pixclock;
var->hsync_len = imxfb_mode->mode.hsync_len;
var->left_margin = imxfb_mode->mode.left_margin;
var->right_margin = imxfb_mode->mode.right_margin;
var->vsync_len = imxfb_mode->mode.vsync_len;
var->upper_margin = imxfb_mode->mode.upper_margin;
var->lower_margin = imxfb_mode->mode.lower_margin;
var->sync = imxfb_mode->mode.sync;
var->xres_virtual = max(var->xres_virtual, var->xres);
var->yres_virtual = max(var->yres_virtual, var->yres);
pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
lcd_clk = clk_get_rate(fbi->clk_per);
tmp = var->pixclock * (unsigned long long)lcd_clk;
do_div(tmp, 1000000);
if (do_div(tmp, 1000000) > 500000)
tmp++;
pcr = (unsigned int)tmp;
if (--pcr > 0x3F) {
pcr = 0x3F;
printk(KERN_WARNING "Must limit pixel clock to %luHz\n",
lcd_clk / pcr);
}
switch (var->bits_per_pixel) {
case 32:
pcr |= PCR_BPIX_18;
rgb = &def_rgb_18;
break;
case 16:
default:
if (is_imx1_fb(fbi))
pcr |= PCR_BPIX_12;
else
pcr |= PCR_BPIX_16;
if (imxfb_mode->pcr & PCR_TFT)
rgb = &def_rgb_16_tft;
else
rgb = &def_rgb_16_stn;
break;
case 8:
pcr |= PCR_BPIX_8;
rgb = &def_rgb_8;
break;
}
/* add sync polarities */
pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25));
fbi->pcr = pcr;
/*
* The LCDC AUS Mode Control Register does not exist on imx1.
*/
if (!is_imx1_fb(fbi) && imxfb_mode->aus_mode)
fbi->lauscr = LAUSCR_AUS_MODE;
/*
* Copy the RGB parameters for this display
* from the machine specific parameters.
*/
var->red = rgb->red;
var->green = rgb->green;
var->blue = rgb->blue;
var->transp = rgb->transp;
pr_debug("RGBT length = %d:%d:%d:%d\n",
var->red.length, var->green.length, var->blue.length,
var->transp.length);
pr_debug("RGBT offset = %d:%d:%d:%d\n",
var->red.offset, var->green.offset, var->blue.offset,
var->transp.offset);
return 0;
}
/*
* imxfb_set_par():
* Set the user defined part of the display for the specified console
*/
static int imxfb_set_par(struct fb_info *info)
{
struct imxfb_info *fbi = info->par;
struct fb_var_screeninfo *var = &info->var;
if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
info->fix.visual = FB_VISUAL_TRUECOLOR;
else if (!fbi->cmap_static)
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
else {
/*
* Some people have weird ideas about wanting static
* pseudocolor maps. I suspect their user space
* applications are broken.
*/
info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
}
info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
imxfb_activate_var(var, info);
return 0;
}
static int imxfb_enable_controller(struct imxfb_info *fbi)
{
int ret;
if (fbi->enabled)
return 0;
pr_debug("Enabling LCD controller\n");
writel(fbi->map_dma, fbi->regs + LCDC_SSA);
/* panning offset 0 (0 pixel offset) */
writel(0x00000000, fbi->regs + LCDC_POS);
/* disable hardware cursor */
writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1),
fbi->regs + LCDC_CPOS);
/*
* RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt
* on other SoCs
*/
writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
ret = clk_prepare_enable(fbi->clk_ipg);
if (ret)
goto err_enable_ipg;
ret = clk_prepare_enable(fbi->clk_ahb);
if (ret)
goto err_enable_ahb;
ret = clk_prepare_enable(fbi->clk_per);
if (ret)
goto err_enable_per;
fbi->enabled = true;
return 0;
err_enable_per:
clk_disable_unprepare(fbi->clk_ahb);
err_enable_ahb:
clk_disable_unprepare(fbi->clk_ipg);
err_enable_ipg:
writel(0, fbi->regs + LCDC_RMCR);
return ret;
}
static void imxfb_disable_controller(struct imxfb_info *fbi)
{
if (!fbi->enabled)
return;
pr_debug("Disabling LCD controller\n");
clk_disable_unprepare(fbi->clk_per);
clk_disable_unprepare(fbi->clk_ahb);
clk_disable_unprepare(fbi->clk_ipg);
fbi->enabled = false;
writel(0, fbi->regs + LCDC_RMCR);
}
static int imxfb_blank(int blank, struct fb_info *info)
{
struct imxfb_info *fbi = info->par;
pr_debug("imxfb_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:
imxfb_disable_controller(fbi);
break;
case FB_BLANK_UNBLANK:
return imxfb_enable_controller(fbi);
}
return 0;
}
static const struct fb_ops imxfb_ops = {
.owner = THIS_MODULE,
.fb_check_var = imxfb_check_var,
.fb_set_par = imxfb_set_par,
.fb_setcolreg = imxfb_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_blank = imxfb_blank,
};
/*
* imxfb_activate_var():
* Configures LCD Controller based on entries in var parameter. Settings are
* only written to the controller if changes were made.
*/
static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
struct imxfb_info *fbi = info->par;
u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21;
pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
var->xres, var->hsync_len,
var->left_margin, var->right_margin);
pr_debug("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)
printk(KERN_ERR "%s: invalid xres %d\n",
info->fix.id, var->xres);
if (var->hsync_len < 1 || var->hsync_len > 64)
printk(KERN_ERR "%s: invalid hsync_len %d\n",
info->fix.id, var->hsync_len);
if (var->left_margin > 255)
printk(KERN_ERR "%s: invalid left_margin %d\n",
info->fix.id, var->left_margin);
if (var->right_margin > 255)
printk(KERN_ERR "%s: invalid right_margin %d\n",
info->fix.id, var->right_margin);
if (var->yres < 1 || var->yres > ymax_mask)
printk(KERN_ERR "%s: invalid yres %d\n",
info->fix.id, var->yres);
if (var->vsync_len > 100)
printk(KERN_ERR "%s: invalid vsync_len %d\n",
info->fix.id, var->vsync_len);
if (var->upper_margin > 63)
printk(KERN_ERR "%s: invalid upper_margin %d\n",
info->fix.id, var->upper_margin);
if (var->lower_margin > 255)
printk(KERN_ERR "%s: invalid lower_margin %d\n",
info->fix.id, var->lower_margin);
#endif
/* physical screen start address */
writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4),
fbi->regs + LCDC_VPW);
writel(HCR_H_WIDTH(var->hsync_len - 1) |
HCR_H_WAIT_1(var->right_margin - 1) |
HCR_H_WAIT_2(var->left_margin - 3),
fbi->regs + LCDC_HCR);
writel(VCR_V_WIDTH(var->vsync_len) |
VCR_V_WAIT_1(var->lower_margin) |
VCR_V_WAIT_2(var->upper_margin),
fbi->regs + LCDC_VCR);
writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask),
fbi->regs + LCDC_SIZE);
writel(fbi->pcr, fbi->regs + LCDC_PCR);
if (fbi->pwmr)
writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
/* dmacr = 0 is no valid value, as we need DMA control marks. */
if (fbi->dmacr)
writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
if (fbi->lauscr)
writel(fbi->lauscr, fbi->regs + LCDC_LAUSCR);
return 0;
}
static int imxfb_init_fbinfo(struct platform_device *pdev)
{
struct imx_fb_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct fb_info *info = dev_get_drvdata(&pdev->dev);
struct imxfb_info *fbi = info->par;
struct device_node *np;
pr_debug("%s\n",__func__);
info->pseudo_palette = kmalloc_array(16, sizeof(u32), GFP_KERNEL);
if (!info->pseudo_palette)
return -ENOMEM;
memset(fbi, 0, sizeof(struct imxfb_info));
fbi->devtype = pdev->id_entry->driver_data;
strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
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 = &imxfb_ops;
info->flags = FBINFO_FLAG_DEFAULT |
FBINFO_READS_FAST;
if (pdata) {
fbi->lscr1 = pdata->lscr1;
fbi->dmacr = pdata->dmacr;
fbi->pwmr = pdata->pwmr;
} else {
np = pdev->dev.of_node;
info->var.grayscale = of_property_read_bool(np,
"cmap-greyscale");
fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse");
fbi->cmap_static = of_property_read_bool(np, "cmap-static");
fbi->lscr1 = IMXFB_LSCR1_DEFAULT;
of_property_read_u32(np, "fsl,lpccr", &fbi->pwmr);
of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1);
of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr);
}
return 0;
}
static int imxfb_of_read_mode(struct device *dev, struct device_node *np,
struct imx_fb_videomode *imxfb_mode)
{
int ret;
struct fb_videomode *of_mode = &imxfb_mode->mode;
u32 bpp;
u32 pcr;
ret = of_property_read_string(np, "model", &of_mode->name);
if (ret)
of_mode->name = NULL;
ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE);
if (ret) {
dev_err(dev, "Failed to get videomode from DT\n");
return ret;
}
ret = of_property_read_u32(np, "bits-per-pixel", &bpp);
ret |= of_property_read_u32(np, "fsl,pcr", &pcr);
if (ret) {
dev_err(dev, "Failed to read bpp and pcr from DT\n");
return -EINVAL;
}
if (bpp < 1 || bpp > 255) {
dev_err(dev, "Bits per pixel have to be between 1 and 255\n");
return -EINVAL;
}
imxfb_mode->bpp = bpp;
imxfb_mode->pcr = pcr;
/*
* fsl,aus-mode is optional
*/
imxfb_mode->aus_mode = of_property_read_bool(np, "fsl,aus-mode");
return 0;
}
static int imxfb_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi)
{
struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
if (!fi || fi->par == fbi)
return 1;
return 0;
}
static int imxfb_lcd_get_contrast(struct lcd_device *lcddev)
{
struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
return fbi->pwmr & 0xff;
}
static int imxfb_lcd_set_contrast(struct lcd_device *lcddev, int contrast)
{
struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
if (fbi->pwmr && fbi->enabled) {
if (contrast > 255)
contrast = 255;
else if (contrast < 0)
contrast = 0;
fbi->pwmr &= ~0xff;
fbi->pwmr |= contrast;
writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
}
return 0;
}
static int imxfb_lcd_get_power(struct lcd_device *lcddev)
{
struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
if (!IS_ERR(fbi->lcd_pwr) &&
!regulator_is_enabled(fbi->lcd_pwr))
return FB_BLANK_POWERDOWN;
return FB_BLANK_UNBLANK;
}
static int imxfb_regulator_set(struct imxfb_info *fbi, int enable)
{
int ret;
if (enable == fbi->lcd_pwr_enabled)
return 0;
if (enable)
ret = regulator_enable(fbi->lcd_pwr);
else
ret = regulator_disable(fbi->lcd_pwr);
if (ret == 0)
fbi->lcd_pwr_enabled = enable;
return ret;
}
static int imxfb_lcd_set_power(struct lcd_device *lcddev, int power)
{
struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev);
if (!IS_ERR(fbi->lcd_pwr))
return imxfb_regulator_set(fbi, power == FB_BLANK_UNBLANK);
return 0;
}
static struct lcd_ops imxfb_lcd_ops = {
.check_fb = imxfb_lcd_check_fb,
.get_contrast = imxfb_lcd_get_contrast,
.set_contrast = imxfb_lcd_set_contrast,
.get_power = imxfb_lcd_get_power,
.set_power = imxfb_lcd_set_power,
};
static int imxfb_setup(void)
{
char *opt, *options = NULL;
if (fb_get_options("imxfb", &options))
return -ENODEV;
if (!options || !*options)
return 0;
while ((opt = strsep(&options, ",")) != NULL) {
if (!*opt)
continue;
else
fb_mode = opt;
}
return 0;
}
static int imxfb_probe(struct platform_device *pdev)
{
struct imxfb_info *fbi;
struct lcd_device *lcd;
struct fb_info *info;
struct imx_fb_platform_data *pdata;
struct resource *res;
struct imx_fb_videomode *m;
const struct of_device_id *of_id;
int ret, i;
int bytes_per_pixel;
dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
ret = imxfb_setup();
if (ret < 0)
return ret;
of_id = of_match_device(imxfb_of_dev_id, &pdev->dev);
if (of_id)
pdev->id_entry = of_id->data;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
pdata = dev_get_platdata(&pdev->dev);
info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
if (!info)
return -ENOMEM;
fbi = info->par;
platform_set_drvdata(pdev, info);
ret = imxfb_init_fbinfo(pdev);
if (ret < 0)
goto failed_init;
if (pdata) {
if (!fb_mode)
fb_mode = pdata->mode[0].mode.name;
fbi->mode = pdata->mode;
fbi->num_modes = pdata->num_modes;
} else {
struct device_node *display_np;
fb_mode = NULL;
display_np = of_parse_phandle(pdev->dev.of_node, "display", 0);
if (!display_np) {
dev_err(&pdev->dev, "No display defined in devicetree\n");
ret = -EINVAL;
goto failed_of_parse;
}
/*
* imxfb does not support more modes, we choose only the native
* mode.
*/
fbi->num_modes = 1;
fbi->mode = devm_kzalloc(&pdev->dev,
sizeof(struct imx_fb_videomode), GFP_KERNEL);
if (!fbi->mode) {
ret = -ENOMEM;
goto failed_of_parse;
}
ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode);
if (ret)
goto failed_of_parse;
}
/* Calculate maximum bytes used per pixel. In most cases this should
* be the same as m->bpp/8 */
m = &fbi->mode[0];
bytes_per_pixel = (m->bpp + 7) / 8;
for (i = 0; i < fbi->num_modes; i++, m++)
info->fix.smem_len = max_t(size_t, info->fix.smem_len,
m->mode.xres * m->mode.yres * bytes_per_pixel);
res = request_mem_region(res->start, resource_size(res),
DRIVER_NAME);
if (!res) {
ret = -EBUSY;
goto failed_req;
}
fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(fbi->clk_ipg)) {
ret = PTR_ERR(fbi->clk_ipg);
goto failed_getclock;
}
/*
* The LCDC controller does not have an enable bit. The
* controller starts directly when the clocks are enabled.
* If the clocks are enabled when the controller is not yet
* programmed with proper register values (enabled at the
* bootloader, for example) then it just goes into some undefined
* state.
* To avoid this issue, let's enable and disable LCDC IPG clock
* so that we force some kind of 'reset' to the LCDC block.
*/
ret = clk_prepare_enable(fbi->clk_ipg);
if (ret)
goto failed_getclock;
clk_disable_unprepare(fbi->clk_ipg);
fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(fbi->clk_ahb)) {
ret = PTR_ERR(fbi->clk_ahb);
goto failed_getclock;
}
fbi->clk_per = devm_clk_get(&pdev->dev, "per");
if (IS_ERR(fbi->clk_per)) {
ret = PTR_ERR(fbi->clk_per);
goto failed_getclock;
}
fbi->regs = ioremap(res->start, resource_size(res));
if (fbi->regs == NULL) {
dev_err(&pdev->dev, "Cannot map frame buffer registers\n");
ret = -ENOMEM;
goto failed_ioremap;
}
fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
info->screen_buffer = dma_alloc_wc(&pdev->dev, fbi->map_size,
&fbi->map_dma, GFP_KERNEL);
if (!info->screen_buffer) {
dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
ret = -ENOMEM;
goto failed_map;
}
info->fix.smem_start = fbi->map_dma;
if (pdata && pdata->init) {
ret = pdata->init(fbi->pdev);
if (ret)
goto failed_platform_init;
}
INIT_LIST_HEAD(&info->modelist);
for (i = 0; i < fbi->num_modes; i++)
fb_add_videomode(&fbi->mode[i].mode, &info->modelist);
/*
* This makes sure that our colour bitfield
* descriptors are correctly initialised.
*/
imxfb_check_var(&info->var, info);
/*
* For modes > 8bpp, the color map is bypassed.
* Therefore, 256 entries are enough.
*/
ret = fb_alloc_cmap(&info->cmap, 256, 0);
if (ret < 0)
goto failed_cmap;
imxfb_set_par(info);
ret = register_framebuffer(info);
if (ret < 0) {
dev_err(&pdev->dev, "failed to register framebuffer\n");
goto failed_register;
}
fbi->lcd_pwr = devm_regulator_get(&pdev->dev, "lcd");
if (PTR_ERR(fbi->lcd_pwr) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto failed_lcd;
}
lcd = devm_lcd_device_register(&pdev->dev, "imxfb-lcd", &pdev->dev, fbi,
&imxfb_lcd_ops);
if (IS_ERR(lcd)) {
ret = PTR_ERR(lcd);
goto failed_lcd;
}
lcd->props.max_contrast = 0xff;
imxfb_enable_controller(fbi);
fbi->pdev = pdev;
return 0;
failed_lcd:
unregister_framebuffer(info);
failed_register:
fb_dealloc_cmap(&info->cmap);
failed_cmap:
if (pdata && pdata->exit)
pdata->exit(fbi->pdev);
failed_platform_init:
dma_free_wc(&pdev->dev, fbi->map_size, info->screen_buffer,
fbi->map_dma);
failed_map:
iounmap(fbi->regs);
failed_ioremap:
failed_getclock:
release_mem_region(res->start, resource_size(res));
failed_req:
failed_of_parse:
kfree(info->pseudo_palette);
failed_init:
framebuffer_release(info);
return ret;
}
static int imxfb_remove(struct platform_device *pdev)
{
struct imx_fb_platform_data *pdata;
struct fb_info *info = platform_get_drvdata(pdev);
struct imxfb_info *fbi = info->par;
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
imxfb_disable_controller(fbi);
unregister_framebuffer(info);
fb_dealloc_cmap(&info->cmap);
pdata = dev_get_platdata(&pdev->dev);
if (pdata && pdata->exit)
pdata->exit(fbi->pdev);
dma_free_wc(&pdev->dev, fbi->map_size, info->screen_buffer,
fbi->map_dma);
iounmap(fbi->regs);
release_mem_region(res->start, resource_size(res));
kfree(info->pseudo_palette);
framebuffer_release(info);
return 0;
}
static int __maybe_unused imxfb_suspend(struct device *dev)
{
struct fb_info *info = dev_get_drvdata(dev);
struct imxfb_info *fbi = info->par;
imxfb_disable_controller(fbi);
return 0;
}
static int __maybe_unused imxfb_resume(struct device *dev)
{
struct fb_info *info = dev_get_drvdata(dev);
struct imxfb_info *fbi = info->par;
imxfb_enable_controller(fbi);
return 0;
}
static SIMPLE_DEV_PM_OPS(imxfb_pm_ops, imxfb_suspend, imxfb_resume);
static struct platform_driver imxfb_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = imxfb_of_dev_id,
.pm = &imxfb_pm_ops,
},
.probe = imxfb_probe,
.remove = imxfb_remove,
.id_table = imxfb_devtype,
};
module_platform_driver(imxfb_driver);
MODULE_DESCRIPTION("Freescale i.MX framebuffer driver");
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
MODULE_LICENSE("GPL");