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linux-stable/drivers/video/mx3fb.c
Fabio Estevam f3d8496e9c drivers/video/mx3fb.c: use NULL for pointer 
Fix the following sparse error:

  drivers/video/mx3fb.c:1309:28: warning: Using plain integer as NULL pointer

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-21 17:22:19 -08:00

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/*
* Copyright (C) 2008
* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
*
* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/console.h>
#include <linux/clk.h>
#include <linux/mutex.h>
#include <linux/dma/ipu-dma.h>
#include <linux/platform_data/dma-imx.h>
#include <linux/platform_data/video-mx3fb.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#define MX3FB_NAME "mx3_sdc_fb"
#define MX3FB_REG_OFFSET 0xB4
/* SDC Registers */
#define SDC_COM_CONF (0xB4 - MX3FB_REG_OFFSET)
#define SDC_GW_CTRL (0xB8 - MX3FB_REG_OFFSET)
#define SDC_FG_POS (0xBC - MX3FB_REG_OFFSET)
#define SDC_BG_POS (0xC0 - MX3FB_REG_OFFSET)
#define SDC_CUR_POS (0xC4 - MX3FB_REG_OFFSET)
#define SDC_PWM_CTRL (0xC8 - MX3FB_REG_OFFSET)
#define SDC_CUR_MAP (0xCC - MX3FB_REG_OFFSET)
#define SDC_HOR_CONF (0xD0 - MX3FB_REG_OFFSET)
#define SDC_VER_CONF (0xD4 - MX3FB_REG_OFFSET)
#define SDC_SHARP_CONF_1 (0xD8 - MX3FB_REG_OFFSET)
#define SDC_SHARP_CONF_2 (0xDC - MX3FB_REG_OFFSET)
/* Register bits */
#define SDC_COM_TFT_COLOR 0x00000001UL
#define SDC_COM_FG_EN 0x00000010UL
#define SDC_COM_GWSEL 0x00000020UL
#define SDC_COM_GLB_A 0x00000040UL
#define SDC_COM_KEY_COLOR_G 0x00000080UL
#define SDC_COM_BG_EN 0x00000200UL
#define SDC_COM_SHARP 0x00001000UL
#define SDC_V_SYNC_WIDTH_L 0x00000001UL
/* Display Interface registers */
#define DI_DISP_IF_CONF (0x0124 - MX3FB_REG_OFFSET)
#define DI_DISP_SIG_POL (0x0128 - MX3FB_REG_OFFSET)
#define DI_SER_DISP1_CONF (0x012C - MX3FB_REG_OFFSET)
#define DI_SER_DISP2_CONF (0x0130 - MX3FB_REG_OFFSET)
#define DI_HSP_CLK_PER (0x0134 - MX3FB_REG_OFFSET)
#define DI_DISP0_TIME_CONF_1 (0x0138 - MX3FB_REG_OFFSET)
#define DI_DISP0_TIME_CONF_2 (0x013C - MX3FB_REG_OFFSET)
#define DI_DISP0_TIME_CONF_3 (0x0140 - MX3FB_REG_OFFSET)
#define DI_DISP1_TIME_CONF_1 (0x0144 - MX3FB_REG_OFFSET)
#define DI_DISP1_TIME_CONF_2 (0x0148 - MX3FB_REG_OFFSET)
#define DI_DISP1_TIME_CONF_3 (0x014C - MX3FB_REG_OFFSET)
#define DI_DISP2_TIME_CONF_1 (0x0150 - MX3FB_REG_OFFSET)
#define DI_DISP2_TIME_CONF_2 (0x0154 - MX3FB_REG_OFFSET)
#define DI_DISP2_TIME_CONF_3 (0x0158 - MX3FB_REG_OFFSET)
#define DI_DISP3_TIME_CONF (0x015C - MX3FB_REG_OFFSET)
#define DI_DISP0_DB0_MAP (0x0160 - MX3FB_REG_OFFSET)
#define DI_DISP0_DB1_MAP (0x0164 - MX3FB_REG_OFFSET)
#define DI_DISP0_DB2_MAP (0x0168 - MX3FB_REG_OFFSET)
#define DI_DISP0_CB0_MAP (0x016C - MX3FB_REG_OFFSET)
#define DI_DISP0_CB1_MAP (0x0170 - MX3FB_REG_OFFSET)
#define DI_DISP0_CB2_MAP (0x0174 - MX3FB_REG_OFFSET)
#define DI_DISP1_DB0_MAP (0x0178 - MX3FB_REG_OFFSET)
#define DI_DISP1_DB1_MAP (0x017C - MX3FB_REG_OFFSET)
#define DI_DISP1_DB2_MAP (0x0180 - MX3FB_REG_OFFSET)
#define DI_DISP1_CB0_MAP (0x0184 - MX3FB_REG_OFFSET)
#define DI_DISP1_CB1_MAP (0x0188 - MX3FB_REG_OFFSET)
#define DI_DISP1_CB2_MAP (0x018C - MX3FB_REG_OFFSET)
#define DI_DISP2_DB0_MAP (0x0190 - MX3FB_REG_OFFSET)
#define DI_DISP2_DB1_MAP (0x0194 - MX3FB_REG_OFFSET)
#define DI_DISP2_DB2_MAP (0x0198 - MX3FB_REG_OFFSET)
#define DI_DISP2_CB0_MAP (0x019C - MX3FB_REG_OFFSET)
#define DI_DISP2_CB1_MAP (0x01A0 - MX3FB_REG_OFFSET)
#define DI_DISP2_CB2_MAP (0x01A4 - MX3FB_REG_OFFSET)
#define DI_DISP3_B0_MAP (0x01A8 - MX3FB_REG_OFFSET)
#define DI_DISP3_B1_MAP (0x01AC - MX3FB_REG_OFFSET)
#define DI_DISP3_B2_MAP (0x01B0 - MX3FB_REG_OFFSET)
#define DI_DISP_ACC_CC (0x01B4 - MX3FB_REG_OFFSET)
#define DI_DISP_LLA_CONF (0x01B8 - MX3FB_REG_OFFSET)
#define DI_DISP_LLA_DATA (0x01BC - MX3FB_REG_OFFSET)
/* DI_DISP_SIG_POL bits */
#define DI_D3_VSYNC_POL_SHIFT 28
#define DI_D3_HSYNC_POL_SHIFT 27
#define DI_D3_DRDY_SHARP_POL_SHIFT 26
#define DI_D3_CLK_POL_SHIFT 25
#define DI_D3_DATA_POL_SHIFT 24
/* DI_DISP_IF_CONF bits */
#define DI_D3_CLK_IDLE_SHIFT 26
#define DI_D3_CLK_SEL_SHIFT 25
#define DI_D3_DATAMSK_SHIFT 24
enum ipu_panel {
IPU_PANEL_SHARP_TFT,
IPU_PANEL_TFT,
};
struct ipu_di_signal_cfg {
unsigned datamask_en:1;
unsigned clksel_en:1;
unsigned clkidle_en:1;
unsigned data_pol:1; /* true = inverted */
unsigned clk_pol:1; /* true = rising edge */
unsigned enable_pol:1;
unsigned Hsync_pol:1; /* true = active high */
unsigned Vsync_pol:1;
};
static const struct fb_videomode mx3fb_modedb[] = {
{
/* 240x320 @ 60 Hz */
.name = "Sharp-QVGA",
.refresh = 60,
.xres = 240,
.yres = 320,
.pixclock = 185925,
.left_margin = 9,
.right_margin = 16,
.upper_margin = 7,
.lower_margin = 9,
.hsync_len = 1,
.vsync_len = 1,
.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_SHARP_MODE |
FB_SYNC_CLK_INVERT | FB_SYNC_DATA_INVERT |
FB_SYNC_CLK_IDLE_EN,
.vmode = FB_VMODE_NONINTERLACED,
.flag = 0,
}, {
/* 240x33 @ 60 Hz */
.name = "Sharp-CLI",
.refresh = 60,
.xres = 240,
.yres = 33,
.pixclock = 185925,
.left_margin = 9,
.right_margin = 16,
.upper_margin = 7,
.lower_margin = 9 + 287,
.hsync_len = 1,
.vsync_len = 1,
.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_SHARP_MODE |
FB_SYNC_CLK_INVERT | FB_SYNC_DATA_INVERT |
FB_SYNC_CLK_IDLE_EN,
.vmode = FB_VMODE_NONINTERLACED,
.flag = 0,
}, {
/* 640x480 @ 60 Hz */
.name = "NEC-VGA",
.refresh = 60,
.xres = 640,
.yres = 480,
.pixclock = 38255,
.left_margin = 144,
.right_margin = 0,
.upper_margin = 34,
.lower_margin = 40,
.hsync_len = 1,
.vsync_len = 1,
.sync = FB_SYNC_VERT_HIGH_ACT | FB_SYNC_OE_ACT_HIGH,
.vmode = FB_VMODE_NONINTERLACED,
.flag = 0,
}, {
/* NTSC TV output */
.name = "TV-NTSC",
.refresh = 60,
.xres = 640,
.yres = 480,
.pixclock = 37538,
.left_margin = 38,
.right_margin = 858 - 640 - 38 - 3,
.upper_margin = 36,
.lower_margin = 518 - 480 - 36 - 1,
.hsync_len = 3,
.vsync_len = 1,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
.flag = 0,
}, {
/* PAL TV output */
.name = "TV-PAL",
.refresh = 50,
.xres = 640,
.yres = 480,
.pixclock = 37538,
.left_margin = 38,
.right_margin = 960 - 640 - 38 - 32,
.upper_margin = 32,
.lower_margin = 555 - 480 - 32 - 3,
.hsync_len = 32,
.vsync_len = 3,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
.flag = 0,
}, {
/* TV output VGA mode, 640x480 @ 65 Hz */
.name = "TV-VGA",
.refresh = 60,
.xres = 640,
.yres = 480,
.pixclock = 40574,
.left_margin = 35,
.right_margin = 45,
.upper_margin = 9,
.lower_margin = 1,
.hsync_len = 46,
.vsync_len = 5,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
.flag = 0,
},
};
struct mx3fb_data {
struct fb_info *fbi;
int backlight_level;
void __iomem *reg_base;
spinlock_t lock;
struct device *dev;
uint32_t h_start_width;
uint32_t v_start_width;
enum disp_data_mapping disp_data_fmt;
};
struct dma_chan_request {
struct mx3fb_data *mx3fb;
enum ipu_channel id;
};
/* MX3 specific framebuffer information. */
struct mx3fb_info {
int blank;
enum ipu_channel ipu_ch;
uint32_t cur_ipu_buf;
u32 pseudo_palette[16];
struct completion flip_cmpl;
struct mutex mutex; /* Protects fb-ops */
struct mx3fb_data *mx3fb;
struct idmac_channel *idmac_channel;
struct dma_async_tx_descriptor *txd;
dma_cookie_t cookie;
struct scatterlist sg[2];
struct fb_var_screeninfo cur_var; /* current var info */
};
static void mx3fb_dma_done(void *);
/* Used fb-mode and bpp. Can be set on kernel command line, therefore file-static. */
static const char *fb_mode;
static unsigned long default_bpp = 16;
static u32 mx3fb_read_reg(struct mx3fb_data *mx3fb, unsigned long reg)
{
return __raw_readl(mx3fb->reg_base + reg);
}
static void mx3fb_write_reg(struct mx3fb_data *mx3fb, u32 value, unsigned long reg)
{
__raw_writel(value, mx3fb->reg_base + reg);
}
struct di_mapping {
uint32_t b0, b1, b2;
};
static const struct di_mapping di_mappings[] = {
[IPU_DISP_DATA_MAPPING_RGB666] = { 0x0005000f, 0x000b000f, 0x0011000f },
[IPU_DISP_DATA_MAPPING_RGB565] = { 0x0004003f, 0x000a000f, 0x000f003f },
[IPU_DISP_DATA_MAPPING_RGB888] = { 0x00070000, 0x000f0000, 0x00170000 },
};
static void sdc_fb_init(struct mx3fb_info *fbi)
{
struct mx3fb_data *mx3fb = fbi->mx3fb;
uint32_t reg;
reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
mx3fb_write_reg(mx3fb, reg | SDC_COM_BG_EN, SDC_COM_CONF);
}
/* Returns enabled flag before uninit */
static uint32_t sdc_fb_uninit(struct mx3fb_info *fbi)
{
struct mx3fb_data *mx3fb = fbi->mx3fb;
uint32_t reg;
reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
mx3fb_write_reg(mx3fb, reg & ~SDC_COM_BG_EN, SDC_COM_CONF);
return reg & SDC_COM_BG_EN;
}
static void sdc_enable_channel(struct mx3fb_info *mx3_fbi)
{
struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
struct idmac_channel *ichan = mx3_fbi->idmac_channel;
struct dma_chan *dma_chan = &ichan->dma_chan;
unsigned long flags;
dma_cookie_t cookie;
if (mx3_fbi->txd)
dev_dbg(mx3fb->dev, "mx3fbi %p, desc %p, sg %p\n", mx3_fbi,
to_tx_desc(mx3_fbi->txd), to_tx_desc(mx3_fbi->txd)->sg);
else
dev_dbg(mx3fb->dev, "mx3fbi %p, txd = NULL\n", mx3_fbi);
/* This enables the channel */
if (mx3_fbi->cookie < 0) {
mx3_fbi->txd = dmaengine_prep_slave_sg(dma_chan,
&mx3_fbi->sg[0], 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
if (!mx3_fbi->txd) {
dev_err(mx3fb->dev, "Cannot allocate descriptor on %d\n",
dma_chan->chan_id);
return;
}
mx3_fbi->txd->callback_param = mx3_fbi->txd;
mx3_fbi->txd->callback = mx3fb_dma_done;
cookie = mx3_fbi->txd->tx_submit(mx3_fbi->txd);
dev_dbg(mx3fb->dev, "%d: Submit %p #%d [%c]\n", __LINE__,
mx3_fbi->txd, cookie, list_empty(&ichan->queue) ? '-' : '+');
} else {
if (!mx3_fbi->txd || !mx3_fbi->txd->tx_submit) {
dev_err(mx3fb->dev, "Cannot enable channel %d\n",
dma_chan->chan_id);
return;
}
/* Just re-activate the same buffer */
dma_async_issue_pending(dma_chan);
cookie = mx3_fbi->cookie;
dev_dbg(mx3fb->dev, "%d: Re-submit %p #%d [%c]\n", __LINE__,
mx3_fbi->txd, cookie, list_empty(&ichan->queue) ? '-' : '+');
}
if (cookie >= 0) {
spin_lock_irqsave(&mx3fb->lock, flags);
sdc_fb_init(mx3_fbi);
mx3_fbi->cookie = cookie;
spin_unlock_irqrestore(&mx3fb->lock, flags);
}
/*
* Attention! Without this msleep the channel keeps generating
* interrupts. Next sdc_set_brightness() is going to be called
* from mx3fb_blank().
*/
msleep(2);
}
static void sdc_disable_channel(struct mx3fb_info *mx3_fbi)
{
struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
uint32_t enabled;
unsigned long flags;
if (mx3_fbi->txd == NULL)
return;
spin_lock_irqsave(&mx3fb->lock, flags);
enabled = sdc_fb_uninit(mx3_fbi);
spin_unlock_irqrestore(&mx3fb->lock, flags);
mx3_fbi->txd->chan->device->device_control(mx3_fbi->txd->chan,
DMA_TERMINATE_ALL, 0);
mx3_fbi->txd = NULL;
mx3_fbi->cookie = -EINVAL;
}
/**
* sdc_set_window_pos() - set window position of the respective plane.
* @mx3fb: mx3fb context.
* @channel: IPU DMAC channel ID.
* @x_pos: X coordinate relative to the top left corner to place window at.
* @y_pos: Y coordinate relative to the top left corner to place window at.
* @return: 0 on success or negative error code on failure.
*/
static int sdc_set_window_pos(struct mx3fb_data *mx3fb, enum ipu_channel channel,
int16_t x_pos, int16_t y_pos)
{
if (channel != IDMAC_SDC_0)
return -EINVAL;
x_pos += mx3fb->h_start_width;
y_pos += mx3fb->v_start_width;
mx3fb_write_reg(mx3fb, (x_pos << 16) | y_pos, SDC_BG_POS);
return 0;
}
/**
* sdc_init_panel() - initialize a synchronous LCD panel.
* @mx3fb: mx3fb context.
* @panel: panel type.
* @pixel_clk: desired pixel clock frequency in Hz.
* @width: width of panel in pixels.
* @height: height of panel in pixels.
* @h_start_width: number of pixel clocks between the HSYNC signal pulse
* and the start of valid data.
* @h_sync_width: width of the HSYNC signal in units of pixel clocks.
* @h_end_width: number of pixel clocks between the end of valid data
* and the HSYNC signal for next line.
* @v_start_width: number of lines between the VSYNC signal pulse and the
* start of valid data.
* @v_sync_width: width of the VSYNC signal in units of lines
* @v_end_width: number of lines between the end of valid data and the
* VSYNC signal for next frame.
* @sig: bitfield of signal polarities for LCD interface.
* @return: 0 on success or negative error code on failure.
*/
static int sdc_init_panel(struct mx3fb_data *mx3fb, enum ipu_panel panel,
uint32_t pixel_clk,
uint16_t width, uint16_t height,
uint16_t h_start_width, uint16_t h_sync_width,
uint16_t h_end_width, uint16_t v_start_width,
uint16_t v_sync_width, uint16_t v_end_width,
struct ipu_di_signal_cfg sig)
{
unsigned long lock_flags;
uint32_t reg;
uint32_t old_conf;
uint32_t div;
struct clk *ipu_clk;
const struct di_mapping *map;
dev_dbg(mx3fb->dev, "panel size = %d x %d", width, height);
if (v_sync_width == 0 || h_sync_width == 0)
return -EINVAL;
/* Init panel size and blanking periods */
reg = ((uint32_t) (h_sync_width - 1) << 26) |
((uint32_t) (width + h_start_width + h_end_width - 1) << 16);
mx3fb_write_reg(mx3fb, reg, SDC_HOR_CONF);
#ifdef DEBUG
printk(KERN_CONT " hor_conf %x,", reg);
#endif
reg = ((uint32_t) (v_sync_width - 1) << 26) | SDC_V_SYNC_WIDTH_L |
((uint32_t) (height + v_start_width + v_end_width - 1) << 16);
mx3fb_write_reg(mx3fb, reg, SDC_VER_CONF);
#ifdef DEBUG
printk(KERN_CONT " ver_conf %x\n", reg);
#endif
mx3fb->h_start_width = h_start_width;
mx3fb->v_start_width = v_start_width;
switch (panel) {
case IPU_PANEL_SHARP_TFT:
mx3fb_write_reg(mx3fb, 0x00FD0102L, SDC_SHARP_CONF_1);
mx3fb_write_reg(mx3fb, 0x00F500F4L, SDC_SHARP_CONF_2);
mx3fb_write_reg(mx3fb, SDC_COM_SHARP | SDC_COM_TFT_COLOR, SDC_COM_CONF);
break;
case IPU_PANEL_TFT:
mx3fb_write_reg(mx3fb, SDC_COM_TFT_COLOR, SDC_COM_CONF);
break;
default:
return -EINVAL;
}
/* Init clocking */
/*
* Calculate divider: fractional part is 4 bits so simply multiple by
* 2^4 to get fractional part, as long as we stay under ~250MHz and on
* i.MX31 it (HSP_CLK) is <= 178MHz. Currently 128.267MHz
*/
ipu_clk = clk_get(mx3fb->dev, NULL);
if (!IS_ERR(ipu_clk)) {
div = clk_get_rate(ipu_clk) * 16 / pixel_clk;
clk_put(ipu_clk);
} else {
div = 0;
}
if (div < 0x40) { /* Divider less than 4 */
dev_dbg(mx3fb->dev,
"InitPanel() - Pixel clock divider less than 4\n");
div = 0x40;
}
dev_dbg(mx3fb->dev, "pixel clk = %u, divider %u.%u\n",
pixel_clk, div >> 4, (div & 7) * 125);
spin_lock_irqsave(&mx3fb->lock, lock_flags);
/*
* DISP3_IF_CLK_DOWN_WR is half the divider value and 2 fraction bits
* fewer. Subtract 1 extra from DISP3_IF_CLK_DOWN_WR based on timing
* debug. DISP3_IF_CLK_UP_WR is 0
*/
mx3fb_write_reg(mx3fb, (((div / 8) - 1) << 22) | div, DI_DISP3_TIME_CONF);
/* DI settings */
old_conf = mx3fb_read_reg(mx3fb, DI_DISP_IF_CONF) & 0x78FFFFFF;
old_conf |= sig.datamask_en << DI_D3_DATAMSK_SHIFT |
sig.clksel_en << DI_D3_CLK_SEL_SHIFT |
sig.clkidle_en << DI_D3_CLK_IDLE_SHIFT;
mx3fb_write_reg(mx3fb, old_conf, DI_DISP_IF_CONF);
old_conf = mx3fb_read_reg(mx3fb, DI_DISP_SIG_POL) & 0xE0FFFFFF;
old_conf |= sig.data_pol << DI_D3_DATA_POL_SHIFT |
sig.clk_pol << DI_D3_CLK_POL_SHIFT |
sig.enable_pol << DI_D3_DRDY_SHARP_POL_SHIFT |
sig.Hsync_pol << DI_D3_HSYNC_POL_SHIFT |
sig.Vsync_pol << DI_D3_VSYNC_POL_SHIFT;
mx3fb_write_reg(mx3fb, old_conf, DI_DISP_SIG_POL);
map = &di_mappings[mx3fb->disp_data_fmt];
mx3fb_write_reg(mx3fb, map->b0, DI_DISP3_B0_MAP);
mx3fb_write_reg(mx3fb, map->b1, DI_DISP3_B1_MAP);
mx3fb_write_reg(mx3fb, map->b2, DI_DISP3_B2_MAP);
spin_unlock_irqrestore(&mx3fb->lock, lock_flags);
dev_dbg(mx3fb->dev, "DI_DISP_IF_CONF = 0x%08X\n",
mx3fb_read_reg(mx3fb, DI_DISP_IF_CONF));
dev_dbg(mx3fb->dev, "DI_DISP_SIG_POL = 0x%08X\n",
mx3fb_read_reg(mx3fb, DI_DISP_SIG_POL));
dev_dbg(mx3fb->dev, "DI_DISP3_TIME_CONF = 0x%08X\n",
mx3fb_read_reg(mx3fb, DI_DISP3_TIME_CONF));
return 0;
}
/**
* sdc_set_color_key() - set the transparent color key for SDC graphic plane.
* @mx3fb: mx3fb context.
* @channel: IPU DMAC channel ID.
* @enable: boolean to enable or disable color keyl.
* @color_key: 24-bit RGB color to use as transparent color key.
* @return: 0 on success or negative error code on failure.
*/
static int sdc_set_color_key(struct mx3fb_data *mx3fb, enum ipu_channel channel,
bool enable, uint32_t color_key)
{
uint32_t reg, sdc_conf;
unsigned long lock_flags;
spin_lock_irqsave(&mx3fb->lock, lock_flags);
sdc_conf = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
if (channel == IDMAC_SDC_0)
sdc_conf &= ~SDC_COM_GWSEL;
else
sdc_conf |= SDC_COM_GWSEL;
if (enable) {
reg = mx3fb_read_reg(mx3fb, SDC_GW_CTRL) & 0xFF000000L;
mx3fb_write_reg(mx3fb, reg | (color_key & 0x00FFFFFFL),
SDC_GW_CTRL);
sdc_conf |= SDC_COM_KEY_COLOR_G;
} else {
sdc_conf &= ~SDC_COM_KEY_COLOR_G;
}
mx3fb_write_reg(mx3fb, sdc_conf, SDC_COM_CONF);
spin_unlock_irqrestore(&mx3fb->lock, lock_flags);
return 0;
}
/**
* sdc_set_global_alpha() - set global alpha blending modes.
* @mx3fb: mx3fb context.
* @enable: boolean to enable or disable global alpha blending. If disabled,
* per pixel blending is used.
* @alpha: global alpha value.
* @return: 0 on success or negative error code on failure.
*/
static int sdc_set_global_alpha(struct mx3fb_data *mx3fb, bool enable, uint8_t alpha)
{
uint32_t reg;
unsigned long lock_flags;
spin_lock_irqsave(&mx3fb->lock, lock_flags);
if (enable) {
reg = mx3fb_read_reg(mx3fb, SDC_GW_CTRL) & 0x00FFFFFFL;
mx3fb_write_reg(mx3fb, reg | ((uint32_t) alpha << 24), SDC_GW_CTRL);
reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
mx3fb_write_reg(mx3fb, reg | SDC_COM_GLB_A, SDC_COM_CONF);
} else {
reg = mx3fb_read_reg(mx3fb, SDC_COM_CONF);
mx3fb_write_reg(mx3fb, reg & ~SDC_COM_GLB_A, SDC_COM_CONF);
}
spin_unlock_irqrestore(&mx3fb->lock, lock_flags);
return 0;
}
static void sdc_set_brightness(struct mx3fb_data *mx3fb, uint8_t value)
{
dev_dbg(mx3fb->dev, "%s: value = %d\n", __func__, value);
/* This might be board-specific */
mx3fb_write_reg(mx3fb, 0x03000000UL | value << 16, SDC_PWM_CTRL);
return;
}
static uint32_t bpp_to_pixfmt(int bpp)
{
uint32_t pixfmt = 0;
switch (bpp) {
case 24:
pixfmt = IPU_PIX_FMT_BGR24;
break;
case 32:
pixfmt = IPU_PIX_FMT_BGR32;
break;
case 16:
pixfmt = IPU_PIX_FMT_RGB565;
break;
}
return pixfmt;
}
static int mx3fb_blank(int blank, struct fb_info *fbi);
static int mx3fb_map_video_memory(struct fb_info *fbi, unsigned int mem_len,
bool lock);
static int mx3fb_unmap_video_memory(struct fb_info *fbi);
/**
* mx3fb_set_fix() - set fixed framebuffer parameters from variable settings.
* @info: framebuffer information pointer
* @return: 0 on success or negative error code on failure.
*/
static int mx3fb_set_fix(struct fb_info *fbi)
{
struct fb_fix_screeninfo *fix = &fbi->fix;
struct fb_var_screeninfo *var = &fbi->var;
strncpy(fix->id, "DISP3 BG", 8);
fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
fix->type = FB_TYPE_PACKED_PIXELS;
fix->accel = FB_ACCEL_NONE;
fix->visual = FB_VISUAL_TRUECOLOR;
fix->xpanstep = 1;
fix->ypanstep = 1;
return 0;
}
static void mx3fb_dma_done(void *arg)
{
struct idmac_tx_desc *tx_desc = to_tx_desc(arg);
struct dma_chan *chan = tx_desc->txd.chan;
struct idmac_channel *ichannel = to_idmac_chan(chan);
struct mx3fb_data *mx3fb = ichannel->client;
struct mx3fb_info *mx3_fbi = mx3fb->fbi->par;
dev_dbg(mx3fb->dev, "irq %d callback\n", ichannel->eof_irq);
/* We only need one interrupt, it will be re-enabled as needed */
disable_irq_nosync(ichannel->eof_irq);
complete(&mx3_fbi->flip_cmpl);
}
static bool mx3fb_must_set_par(struct fb_info *fbi)
{
struct mx3fb_info *mx3_fbi = fbi->par;
struct fb_var_screeninfo old_var = mx3_fbi->cur_var;
struct fb_var_screeninfo new_var = fbi->var;
if ((fbi->var.activate & FB_ACTIVATE_FORCE) &&
(fbi->var.activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW)
return true;
/*
* Ignore xoffset and yoffset update,
* because pan display handles this case.
*/
old_var.xoffset = new_var.xoffset;
old_var.yoffset = new_var.yoffset;
return !!memcmp(&old_var, &new_var, sizeof(struct fb_var_screeninfo));
}
static int __set_par(struct fb_info *fbi, bool lock)
{
u32 mem_len, cur_xoffset, cur_yoffset;
struct ipu_di_signal_cfg sig_cfg;
enum ipu_panel mode = IPU_PANEL_TFT;
struct mx3fb_info *mx3_fbi = fbi->par;
struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
struct idmac_channel *ichan = mx3_fbi->idmac_channel;
struct idmac_video_param *video = &ichan->params.video;
struct scatterlist *sg = mx3_fbi->sg;
/* Total cleanup */
if (mx3_fbi->txd)
sdc_disable_channel(mx3_fbi);
mx3fb_set_fix(fbi);
mem_len = fbi->var.yres_virtual * fbi->fix.line_length;
if (mem_len > fbi->fix.smem_len) {
if (fbi->fix.smem_start)
mx3fb_unmap_video_memory(fbi);
if (mx3fb_map_video_memory(fbi, mem_len, lock) < 0)
return -ENOMEM;
}
sg_init_table(&sg[0], 1);
sg_init_table(&sg[1], 1);
sg_dma_address(&sg[0]) = fbi->fix.smem_start;
sg_set_page(&sg[0], virt_to_page(fbi->screen_base),
fbi->fix.smem_len,
offset_in_page(fbi->screen_base));
if (mx3_fbi->ipu_ch == IDMAC_SDC_0) {
memset(&sig_cfg, 0, sizeof(sig_cfg));
if (fbi->var.sync & FB_SYNC_HOR_HIGH_ACT)
sig_cfg.Hsync_pol = true;
if (fbi->var.sync & FB_SYNC_VERT_HIGH_ACT)
sig_cfg.Vsync_pol = true;
if (fbi->var.sync & FB_SYNC_CLK_INVERT)
sig_cfg.clk_pol = true;
if (fbi->var.sync & FB_SYNC_DATA_INVERT)
sig_cfg.data_pol = true;
if (fbi->var.sync & FB_SYNC_OE_ACT_HIGH)
sig_cfg.enable_pol = true;
if (fbi->var.sync & FB_SYNC_CLK_IDLE_EN)
sig_cfg.clkidle_en = true;
if (fbi->var.sync & FB_SYNC_CLK_SEL_EN)
sig_cfg.clksel_en = true;
if (fbi->var.sync & FB_SYNC_SHARP_MODE)
mode = IPU_PANEL_SHARP_TFT;
dev_dbg(fbi->device, "pixclock = %ul Hz\n",
(u32) (PICOS2KHZ(fbi->var.pixclock) * 1000UL));
if (sdc_init_panel(mx3fb, mode,
(PICOS2KHZ(fbi->var.pixclock)) * 1000UL,
fbi->var.xres, fbi->var.yres,
fbi->var.left_margin,
fbi->var.hsync_len,
fbi->var.right_margin +
fbi->var.hsync_len,
fbi->var.upper_margin,
fbi->var.vsync_len,
fbi->var.lower_margin +
fbi->var.vsync_len, sig_cfg) != 0) {
dev_err(fbi->device,
"mx3fb: Error initializing panel.\n");
return -EINVAL;
}
}
sdc_set_window_pos(mx3fb, mx3_fbi->ipu_ch, 0, 0);
mx3_fbi->cur_ipu_buf = 0;
video->out_pixel_fmt = bpp_to_pixfmt(fbi->var.bits_per_pixel);
video->out_width = fbi->var.xres;
video->out_height = fbi->var.yres;
video->out_stride = fbi->var.xres_virtual;
if (mx3_fbi->blank == FB_BLANK_UNBLANK) {
sdc_enable_channel(mx3_fbi);
/*
* sg[0] points to fb smem_start address
* and is actually active in controller.
*/
mx3_fbi->cur_var.xoffset = 0;
mx3_fbi->cur_var.yoffset = 0;
}
/*
* Preserve xoffset and yoffest in case they are
* inactive in controller as fb is blanked.
*/
cur_xoffset = mx3_fbi->cur_var.xoffset;
cur_yoffset = mx3_fbi->cur_var.yoffset;
mx3_fbi->cur_var = fbi->var;
mx3_fbi->cur_var.xoffset = cur_xoffset;
mx3_fbi->cur_var.yoffset = cur_yoffset;
return 0;
}
/**
* mx3fb_set_par() - set framebuffer parameters and change the operating mode.
* @fbi: framebuffer information pointer.
* @return: 0 on success or negative error code on failure.
*/
static int mx3fb_set_par(struct fb_info *fbi)
{
struct mx3fb_info *mx3_fbi = fbi->par;
struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
struct idmac_channel *ichan = mx3_fbi->idmac_channel;
int ret;
dev_dbg(mx3fb->dev, "%s [%c]\n", __func__, list_empty(&ichan->queue) ? '-' : '+');
mutex_lock(&mx3_fbi->mutex);
ret = mx3fb_must_set_par(fbi) ? __set_par(fbi, true) : 0;
mutex_unlock(&mx3_fbi->mutex);
return ret;
}
/**
* mx3fb_check_var() - check and adjust framebuffer variable parameters.
* @var: framebuffer variable parameters
* @fbi: framebuffer information pointer
*/
static int mx3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *fbi)
{
struct mx3fb_info *mx3_fbi = fbi->par;
u32 vtotal;
u32 htotal;
dev_dbg(fbi->device, "%s\n", __func__);
if (var->xres_virtual < var->xres)
var->xres_virtual = var->xres;
if (var->yres_virtual < var->yres)
var->yres_virtual = var->yres;
if ((var->bits_per_pixel != 32) && (var->bits_per_pixel != 24) &&
(var->bits_per_pixel != 16))
var->bits_per_pixel = default_bpp;
switch (var->bits_per_pixel) {
case 16:
var->red.length = 5;
var->red.offset = 11;
var->red.msb_right = 0;
var->green.length = 6;
var->green.offset = 5;
var->green.msb_right = 0;
var->blue.length = 5;
var->blue.offset = 0;
var->blue.msb_right = 0;
var->transp.length = 0;
var->transp.offset = 0;
var->transp.msb_right = 0;
break;
case 24:
var->red.length = 8;
var->red.offset = 16;
var->red.msb_right = 0;
var->green.length = 8;
var->green.offset = 8;
var->green.msb_right = 0;
var->blue.length = 8;
var->blue.offset = 0;
var->blue.msb_right = 0;
var->transp.length = 0;
var->transp.offset = 0;
var->transp.msb_right = 0;
break;
case 32:
var->red.length = 8;
var->red.offset = 16;
var->red.msb_right = 0;
var->green.length = 8;
var->green.offset = 8;
var->green.msb_right = 0;
var->blue.length = 8;
var->blue.offset = 0;
var->blue.msb_right = 0;
var->transp.length = 8;
var->transp.offset = 24;
var->transp.msb_right = 0;
break;
}
if (var->pixclock < 1000) {
htotal = var->xres + var->right_margin + var->hsync_len +
var->left_margin;
vtotal = var->yres + var->lower_margin + var->vsync_len +
var->upper_margin;
var->pixclock = (vtotal * htotal * 6UL) / 100UL;
var->pixclock = KHZ2PICOS(var->pixclock);
dev_dbg(fbi->device, "pixclock set for 60Hz refresh = %u ps\n",
var->pixclock);
}
var->height = -1;
var->width = -1;
var->grayscale = 0;
/* Preserve sync flags */
var->sync |= mx3_fbi->cur_var.sync;
mx3_fbi->cur_var.sync |= var->sync;
return 0;
}
static u32 chan_to_field(unsigned int chan, struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
static int mx3fb_setcolreg(unsigned int regno, unsigned int red,
unsigned int green, unsigned int blue,
unsigned int trans, struct fb_info *fbi)
{
struct mx3fb_info *mx3_fbi = fbi->par;
u32 val;
int ret = 1;
dev_dbg(fbi->device, "%s, regno = %u\n", __func__, regno);
mutex_lock(&mx3_fbi->mutex);
/*
* If greyscale is true, then we convert the RGB value
* to greyscale no matter what visual we are using.
*/
if (fbi->var.grayscale)
red = green = blue = (19595 * red + 38470 * green +
7471 * blue) >> 16;
switch (fbi->fix.visual) {
case FB_VISUAL_TRUECOLOR:
/*
* 16-bit True Colour. We encode the RGB value
* according to the RGB bitfield information.
*/
if (regno < 16) {
u32 *pal = fbi->pseudo_palette;
val = chan_to_field(red, &fbi->var.red);
val |= chan_to_field(green, &fbi->var.green);
val |= chan_to_field(blue, &fbi->var.blue);
pal[regno] = val;
ret = 0;
}
break;
case FB_VISUAL_STATIC_PSEUDOCOLOR:
case FB_VISUAL_PSEUDOCOLOR:
break;
}
mutex_unlock(&mx3_fbi->mutex);
return ret;
}
static void __blank(int blank, struct fb_info *fbi)
{
struct mx3fb_info *mx3_fbi = fbi->par;
struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
int was_blank = mx3_fbi->blank;
mx3_fbi->blank = blank;
/* Attention!
* Do not call sdc_disable_channel() for a channel that is disabled
* already! This will result in a kernel NULL pointer dereference
* (mx3_fbi->txd is NULL). Hide the fact, that all blank modes are
* handled equally by this driver.
*/
if (blank > FB_BLANK_UNBLANK && was_blank > FB_BLANK_UNBLANK)
return;
switch (blank) {
case FB_BLANK_POWERDOWN:
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
case FB_BLANK_NORMAL:
sdc_set_brightness(mx3fb, 0);
memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);
/* Give LCD time to update - enough for 50 and 60 Hz */
msleep(25);
sdc_disable_channel(mx3_fbi);
break;
case FB_BLANK_UNBLANK:
sdc_enable_channel(mx3_fbi);
sdc_set_brightness(mx3fb, mx3fb->backlight_level);
break;
}
}
/**
* mx3fb_blank() - blank the display.
*/
static int mx3fb_blank(int blank, struct fb_info *fbi)
{
struct mx3fb_info *mx3_fbi = fbi->par;
dev_dbg(fbi->device, "%s, blank = %d, base %p, len %u\n", __func__,
blank, fbi->screen_base, fbi->fix.smem_len);
if (mx3_fbi->blank == blank)
return 0;
mutex_lock(&mx3_fbi->mutex);
__blank(blank, fbi);
mutex_unlock(&mx3_fbi->mutex);
return 0;
}
/**
* mx3fb_pan_display() - pan or wrap the display
* @var: variable screen buffer information.
* @info: framebuffer information pointer.
*
* We look only at xoffset, yoffset and the FB_VMODE_YWRAP flag
*/
static int mx3fb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *fbi)
{
struct mx3fb_info *mx3_fbi = fbi->par;
u32 y_bottom;
unsigned long base;
off_t offset;
dma_cookie_t cookie;
struct scatterlist *sg = mx3_fbi->sg;
struct dma_chan *dma_chan = &mx3_fbi->idmac_channel->dma_chan;
struct dma_async_tx_descriptor *txd;
int ret;
dev_dbg(fbi->device, "%s [%c]\n", __func__,
list_empty(&mx3_fbi->idmac_channel->queue) ? '-' : '+');
if (var->xoffset > 0) {
dev_dbg(fbi->device, "x panning not supported\n");
return -EINVAL;
}
if (mx3_fbi->cur_var.xoffset == var->xoffset &&
mx3_fbi->cur_var.yoffset == var->yoffset)
return 0; /* No change, do nothing */
y_bottom = var->yoffset;
if (!(var->vmode & FB_VMODE_YWRAP))
y_bottom += fbi->var.yres;
if (y_bottom > fbi->var.yres_virtual)
return -EINVAL;
mutex_lock(&mx3_fbi->mutex);
offset = var->yoffset * fbi->fix.line_length
+ var->xoffset * (fbi->var.bits_per_pixel / 8);
base = fbi->fix.smem_start + offset;
dev_dbg(fbi->device, "Updating SDC BG buf %d address=0x%08lX\n",
mx3_fbi->cur_ipu_buf, base);
/*
* We enable the End of Frame interrupt, which will free a tx-descriptor,
* which we will need for the next device_prep_slave_sg(). The
* IRQ-handler will disable the IRQ again.
*/
init_completion(&mx3_fbi->flip_cmpl);
enable_irq(mx3_fbi->idmac_channel->eof_irq);
ret = wait_for_completion_timeout(&mx3_fbi->flip_cmpl, HZ / 10);
if (ret <= 0) {
mutex_unlock(&mx3_fbi->mutex);
dev_info(fbi->device, "Panning failed due to %s\n", ret < 0 ?
"user interrupt" : "timeout");
disable_irq(mx3_fbi->idmac_channel->eof_irq);
return ret ? : -ETIMEDOUT;
}
mx3_fbi->cur_ipu_buf = !mx3_fbi->cur_ipu_buf;
sg_dma_address(&sg[mx3_fbi->cur_ipu_buf]) = base;
sg_set_page(&sg[mx3_fbi->cur_ipu_buf],
virt_to_page(fbi->screen_base + offset), fbi->fix.smem_len,
offset_in_page(fbi->screen_base + offset));
if (mx3_fbi->txd)
async_tx_ack(mx3_fbi->txd);
txd = dmaengine_prep_slave_sg(dma_chan, sg +
mx3_fbi->cur_ipu_buf, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
if (!txd) {
dev_err(fbi->device,
"Error preparing a DMA transaction descriptor.\n");
mutex_unlock(&mx3_fbi->mutex);
return -EIO;
}
txd->callback_param = txd;
txd->callback = mx3fb_dma_done;
/*
* Emulate original mx3fb behaviour: each new call to idmac_tx_submit()
* should switch to another buffer
*/
cookie = txd->tx_submit(txd);
dev_dbg(fbi->device, "%d: Submit %p #%d\n", __LINE__, txd, cookie);
if (cookie < 0) {
dev_err(fbi->device,
"Error updating SDC buf %d to address=0x%08lX\n",
mx3_fbi->cur_ipu_buf, base);
mutex_unlock(&mx3_fbi->mutex);
return -EIO;
}
mx3_fbi->txd = txd;
fbi->var.xoffset = var->xoffset;
fbi->var.yoffset = var->yoffset;
if (var->vmode & FB_VMODE_YWRAP)
fbi->var.vmode |= FB_VMODE_YWRAP;
else
fbi->var.vmode &= ~FB_VMODE_YWRAP;
mx3_fbi->cur_var = fbi->var;
mutex_unlock(&mx3_fbi->mutex);
dev_dbg(fbi->device, "Update complete\n");
return 0;
}
/*
* This structure contains the pointers to the control functions that are
* invoked by the core framebuffer driver to perform operations like
* blitting, rectangle filling, copy regions and cursor definition.
*/
static struct fb_ops mx3fb_ops = {
.owner = THIS_MODULE,
.fb_set_par = mx3fb_set_par,
.fb_check_var = mx3fb_check_var,
.fb_setcolreg = mx3fb_setcolreg,
.fb_pan_display = mx3fb_pan_display,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
.fb_blank = mx3fb_blank,
};
#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.
*/
/*
* Suspends the framebuffer and blanks the screen. Power management support
*/
static int mx3fb_suspend(struct platform_device *pdev, pm_message_t state)
{
struct mx3fb_data *mx3fb = platform_get_drvdata(pdev);
struct mx3fb_info *mx3_fbi = mx3fb->fbi->par;
console_lock();
fb_set_suspend(mx3fb->fbi, 1);
console_unlock();
if (mx3_fbi->blank == FB_BLANK_UNBLANK) {
sdc_disable_channel(mx3_fbi);
sdc_set_brightness(mx3fb, 0);
}
return 0;
}
/*
* Resumes the framebuffer and unblanks the screen. Power management support
*/
static int mx3fb_resume(struct platform_device *pdev)
{
struct mx3fb_data *mx3fb = platform_get_drvdata(pdev);
struct mx3fb_info *mx3_fbi = mx3fb->fbi->par;
if (mx3_fbi->blank == FB_BLANK_UNBLANK) {
sdc_enable_channel(mx3_fbi);
sdc_set_brightness(mx3fb, mx3fb->backlight_level);
}
console_lock();
fb_set_suspend(mx3fb->fbi, 0);
console_unlock();
return 0;
}
#else
#define mx3fb_suspend NULL
#define mx3fb_resume NULL
#endif
/*
* Main framebuffer functions
*/
/**
* mx3fb_map_video_memory() - allocates the DRAM memory for the frame buffer.
* @fbi: framebuffer information pointer
* @mem_len: length of mapped memory
* @lock: do not lock during initialisation
* @return: Error code indicating success or failure
*
* 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 mx3fb_map_video_memory(struct fb_info *fbi, unsigned int mem_len,
bool lock)
{
int retval = 0;
dma_addr_t addr;
fbi->screen_base = dma_alloc_writecombine(fbi->device,
mem_len,
&addr, GFP_DMA);
if (!fbi->screen_base) {
dev_err(fbi->device, "Cannot allocate %u bytes framebuffer memory\n",
mem_len);
retval = -EBUSY;
goto err0;
}
if (lock)
mutex_lock(&fbi->mm_lock);
fbi->fix.smem_start = addr;
fbi->fix.smem_len = mem_len;
if (lock)
mutex_unlock(&fbi->mm_lock);
dev_dbg(fbi->device, "allocated fb @ p=0x%08x, v=0x%p, size=%d.\n",
(uint32_t) fbi->fix.smem_start, fbi->screen_base, fbi->fix.smem_len);
fbi->screen_size = fbi->fix.smem_len;
/* Clear the screen */
memset((char *)fbi->screen_base, 0, fbi->fix.smem_len);
return 0;
err0:
fbi->fix.smem_len = 0;
fbi->fix.smem_start = 0;
fbi->screen_base = NULL;
return retval;
}
/**
* mx3fb_unmap_video_memory() - de-allocate frame buffer memory.
* @fbi: framebuffer information pointer
* @return: error code indicating success or failure
*/
static int mx3fb_unmap_video_memory(struct fb_info *fbi)
{
dma_free_writecombine(fbi->device, fbi->fix.smem_len,
fbi->screen_base, fbi->fix.smem_start);
fbi->screen_base = NULL;
mutex_lock(&fbi->mm_lock);
fbi->fix.smem_start = 0;
fbi->fix.smem_len = 0;
mutex_unlock(&fbi->mm_lock);
return 0;
}
/**
* mx3fb_init_fbinfo() - initialize framebuffer information object.
* @return: initialized framebuffer structure.
*/
static struct fb_info *mx3fb_init_fbinfo(struct device *dev, struct fb_ops *ops)
{
struct fb_info *fbi;
struct mx3fb_info *mx3fbi;
int ret;
/* Allocate sufficient memory for the fb structure */
fbi = framebuffer_alloc(sizeof(struct mx3fb_info), dev);
if (!fbi)
return NULL;
mx3fbi = fbi->par;
mx3fbi->cookie = -EINVAL;
mx3fbi->cur_ipu_buf = 0;
fbi->var.activate = FB_ACTIVATE_NOW;
fbi->fbops = ops;
fbi->flags = FBINFO_FLAG_DEFAULT;
fbi->pseudo_palette = mx3fbi->pseudo_palette;
mutex_init(&mx3fbi->mutex);
/* Allocate colormap */
ret = fb_alloc_cmap(&fbi->cmap, 16, 0);
if (ret < 0) {
framebuffer_release(fbi);
return NULL;
}
return fbi;
}
static int init_fb_chan(struct mx3fb_data *mx3fb, struct idmac_channel *ichan)
{
struct device *dev = mx3fb->dev;
struct mx3fb_platform_data *mx3fb_pdata = dev->platform_data;
const char *name = mx3fb_pdata->name;
unsigned int irq;
struct fb_info *fbi;
struct mx3fb_info *mx3fbi;
const struct fb_videomode *mode;
int ret, num_modes;
if (mx3fb_pdata->disp_data_fmt >= ARRAY_SIZE(di_mappings)) {
dev_err(dev, "Illegal display data format %d\n",
mx3fb_pdata->disp_data_fmt);
return -EINVAL;
}
ichan->client = mx3fb;
irq = ichan->eof_irq;
if (ichan->dma_chan.chan_id != IDMAC_SDC_0)
return -EINVAL;
fbi = mx3fb_init_fbinfo(dev, &mx3fb_ops);
if (!fbi)
return -ENOMEM;
if (!fb_mode)
fb_mode = name;
if (!fb_mode) {
ret = -EINVAL;
goto emode;
}
if (mx3fb_pdata->mode && mx3fb_pdata->num_modes) {
mode = mx3fb_pdata->mode;
num_modes = mx3fb_pdata->num_modes;
} else {
mode = mx3fb_modedb;
num_modes = ARRAY_SIZE(mx3fb_modedb);
}
if (!fb_find_mode(&fbi->var, fbi, fb_mode, mode,
num_modes, NULL, default_bpp)) {
ret = -EBUSY;
goto emode;
}
fb_videomode_to_modelist(mode, num_modes, &fbi->modelist);
/* Default Y virtual size is 2x panel size */
fbi->var.yres_virtual = fbi->var.yres * 2;
mx3fb->fbi = fbi;
/* set Display Interface clock period */
mx3fb_write_reg(mx3fb, 0x00100010L, DI_HSP_CLK_PER);
/* Might need to trigger HSP clock change - see 44.3.3.8.5 */
sdc_set_brightness(mx3fb, 255);
sdc_set_global_alpha(mx3fb, true, 0xFF);
sdc_set_color_key(mx3fb, IDMAC_SDC_0, false, 0);
mx3fbi = fbi->par;
mx3fbi->idmac_channel = ichan;
mx3fbi->ipu_ch = ichan->dma_chan.chan_id;
mx3fbi->mx3fb = mx3fb;
mx3fbi->blank = FB_BLANK_NORMAL;
mx3fb->disp_data_fmt = mx3fb_pdata->disp_data_fmt;
init_completion(&mx3fbi->flip_cmpl);
disable_irq(ichan->eof_irq);
dev_dbg(mx3fb->dev, "disabling irq %d\n", ichan->eof_irq);
ret = __set_par(fbi, false);
if (ret < 0)
goto esetpar;
__blank(FB_BLANK_UNBLANK, fbi);
dev_info(dev, "registered, using mode %s\n", fb_mode);
ret = register_framebuffer(fbi);
if (ret < 0)
goto erfb;
return 0;
erfb:
esetpar:
emode:
fb_dealloc_cmap(&fbi->cmap);
framebuffer_release(fbi);
return ret;
}
static bool chan_filter(struct dma_chan *chan, void *arg)
{
struct dma_chan_request *rq = arg;
struct device *dev;
struct mx3fb_platform_data *mx3fb_pdata;
if (!imx_dma_is_ipu(chan))
return false;
if (!rq)
return false;
dev = rq->mx3fb->dev;
mx3fb_pdata = dev->platform_data;
return rq->id == chan->chan_id &&
mx3fb_pdata->dma_dev == chan->device->dev;
}
static void release_fbi(struct fb_info *fbi)
{
mx3fb_unmap_video_memory(fbi);
fb_dealloc_cmap(&fbi->cmap);
unregister_framebuffer(fbi);
framebuffer_release(fbi);
}
static int mx3fb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
int ret;
struct resource *sdc_reg;
struct mx3fb_data *mx3fb;
dma_cap_mask_t mask;
struct dma_chan *chan;
struct dma_chan_request rq;
/*
* Display Interface (DI) and Synchronous Display Controller (SDC)
* registers
*/
sdc_reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!sdc_reg)
return -EINVAL;
mx3fb = kzalloc(sizeof(*mx3fb), GFP_KERNEL);
if (!mx3fb)
return -ENOMEM;
spin_lock_init(&mx3fb->lock);
mx3fb->reg_base = ioremap(sdc_reg->start, resource_size(sdc_reg));
if (!mx3fb->reg_base) {
ret = -ENOMEM;
goto eremap;
}
pr_debug("Remapped %pR at %p\n", sdc_reg, mx3fb->reg_base);
/* IDMAC interface */
dmaengine_get();
mx3fb->dev = dev;
platform_set_drvdata(pdev, mx3fb);
rq.mx3fb = mx3fb;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
dma_cap_set(DMA_PRIVATE, mask);
rq.id = IDMAC_SDC_0;
chan = dma_request_channel(mask, chan_filter, &rq);
if (!chan) {
ret = -EBUSY;
goto ersdc0;
}
mx3fb->backlight_level = 255;
ret = init_fb_chan(mx3fb, to_idmac_chan(chan));
if (ret < 0)
goto eisdc0;
return 0;
eisdc0:
dma_release_channel(chan);
ersdc0:
dmaengine_put();
iounmap(mx3fb->reg_base);
eremap:
kfree(mx3fb);
dev_err(dev, "mx3fb: failed to register fb\n");
return ret;
}
static int mx3fb_remove(struct platform_device *dev)
{
struct mx3fb_data *mx3fb = platform_get_drvdata(dev);
struct fb_info *fbi = mx3fb->fbi;
struct mx3fb_info *mx3_fbi = fbi->par;
struct dma_chan *chan;
chan = &mx3_fbi->idmac_channel->dma_chan;
release_fbi(fbi);
dma_release_channel(chan);
dmaengine_put();
iounmap(mx3fb->reg_base);
kfree(mx3fb);
return 0;
}
static struct platform_driver mx3fb_driver = {
.driver = {
.name = MX3FB_NAME,
.owner = THIS_MODULE,
},
.probe = mx3fb_probe,
.remove = mx3fb_remove,
.suspend = mx3fb_suspend,
.resume = mx3fb_resume,
};
/*
* Parse user specified options (`video=mx3fb:')
* example:
* video=mx3fb:bpp=16
*/
static int __init mx3fb_setup(void)
{
#ifndef MODULE
char *opt, *options = NULL;
if (fb_get_options("mx3fb", &options))
return -ENODEV;
if (!options || !*options)
return 0;
while ((opt = strsep(&options, ",")) != NULL) {
if (!*opt)
continue;
if (!strncmp(opt, "bpp=", 4))
default_bpp = simple_strtoul(opt + 4, NULL, 0);
else
fb_mode = opt;
}
#endif
return 0;
}
static int __init mx3fb_init(void)
{
int ret = mx3fb_setup();
if (ret < 0)
return ret;
ret = platform_driver_register(&mx3fb_driver);
return ret;
}
static void __exit mx3fb_exit(void)
{
platform_driver_unregister(&mx3fb_driver);
}
module_init(mx3fb_init);
module_exit(mx3fb_exit);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("MX3 framebuffer driver");
MODULE_ALIAS("platform:" MX3FB_NAME);
MODULE_LICENSE("GPL v2");
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