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linux/drivers/video/fbdev/amba-clcd-versatile.c
Linus Walleij cfbd950d5e video: ARM CLCD: fix Vexpress regression 
The CLCD does not come up on Versatile Express as it does not
(currently) have a syscon node for controlling the block apart
from the CLCD itself. Make sure the .init() function can bail
out without an error making it probe again.

Reported-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Amit Pundir <amit.pundir@linaro.org>
Tested-by: Nicolae Rosia <nicolae_rosia@mentor.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
2016-11-03 12:20:14 +02:00

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#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/amba/bus.h>
#include <linux/amba/clcd.h>
#include <linux/platform_data/video-clcd-versatile.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/bitops.h>
#include "amba-clcd-versatile.h"
static struct clcd_panel vga = {
.mode = {
.name = "VGA",
.refresh = 60,
.xres = 640,
.yres = 480,
.pixclock = 39721,
.left_margin = 40,
.right_margin = 24,
.upper_margin = 32,
.lower_margin = 11,
.hsync_len = 96,
.vsync_len = 2,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
},
.width = -1,
.height = -1,
.tim2 = TIM2_BCD | TIM2_IPC,
.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
.caps = CLCD_CAP_5551 | CLCD_CAP_565 | CLCD_CAP_888,
.bpp = 16,
};
static struct clcd_panel xvga = {
.mode = {
.name = "XVGA",
.refresh = 60,
.xres = 1024,
.yres = 768,
.pixclock = 15748,
.left_margin = 152,
.right_margin = 48,
.upper_margin = 23,
.lower_margin = 3,
.hsync_len = 104,
.vsync_len = 4,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
},
.width = -1,
.height = -1,
.tim2 = TIM2_BCD | TIM2_IPC,
.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
.caps = CLCD_CAP_5551 | CLCD_CAP_565 | CLCD_CAP_888,
.bpp = 16,
};
/* Sanyo TM38QV67A02A - 3.8 inch QVGA (320x240) Color TFT */
static struct clcd_panel sanyo_tm38qv67a02a = {
.mode = {
.name = "Sanyo TM38QV67A02A",
.refresh = 116,
.xres = 320,
.yres = 240,
.pixclock = 100000,
.left_margin = 6,
.right_margin = 6,
.upper_margin = 5,
.lower_margin = 5,
.hsync_len = 6,
.vsync_len = 6,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
},
.width = -1,
.height = -1,
.tim2 = TIM2_BCD,
.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
.caps = CLCD_CAP_5551,
.bpp = 16,
};
static struct clcd_panel sanyo_2_5_in = {
.mode = {
.name = "Sanyo QVGA Portrait",
.refresh = 116,
.xres = 240,
.yres = 320,
.pixclock = 100000,
.left_margin = 20,
.right_margin = 10,
.upper_margin = 2,
.lower_margin = 2,
.hsync_len = 10,
.vsync_len = 2,
.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED,
},
.width = -1,
.height = -1,
.tim2 = TIM2_IVS | TIM2_IHS | TIM2_IPC,
.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
.caps = CLCD_CAP_5551,
.bpp = 16,
};
/* Epson L2F50113T00 - 2.2 inch 176x220 Color TFT */
static struct clcd_panel epson_l2f50113t00 = {
.mode = {
.name = "Epson L2F50113T00",
.refresh = 390,
.xres = 176,
.yres = 220,
.pixclock = 62500,
.left_margin = 3,
.right_margin = 2,
.upper_margin = 1,
.lower_margin = 0,
.hsync_len = 3,
.vsync_len = 2,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
},
.width = -1,
.height = -1,
.tim2 = TIM2_BCD | TIM2_IPC,
.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
.caps = CLCD_CAP_5551,
.bpp = 16,
};
static struct clcd_panel *panels[] = {
&vga,
&xvga,
&sanyo_tm38qv67a02a,
&sanyo_2_5_in,
&epson_l2f50113t00,
};
struct clcd_panel *versatile_clcd_get_panel(const char *name)
{
int i;
for (i = 0; i < ARRAY_SIZE(panels); i++)
if (strcmp(panels[i]->mode.name, name) == 0)
break;
if (i < ARRAY_SIZE(panels))
return panels[i];
pr_err("CLCD: couldn't get parameters for panel %s\n", name);
return NULL;
}
int versatile_clcd_setup_dma(struct clcd_fb *fb, unsigned long framesize)
{
dma_addr_t dma;
fb->fb.screen_base = dma_alloc_wc(&fb->dev->dev, framesize, &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 = framesize;
return 0;
}
int versatile_clcd_mmap_dma(struct clcd_fb *fb, struct vm_area_struct *vma)
{
return dma_mmap_wc(&fb->dev->dev, vma, fb->fb.screen_base,
fb->fb.fix.smem_start, fb->fb.fix.smem_len);
}
void versatile_clcd_remove_dma(struct clcd_fb *fb)
{
dma_free_wc(&fb->dev->dev, fb->fb.fix.smem_len, fb->fb.screen_base,
fb->fb.fix.smem_start);
}
#ifdef CONFIG_OF
static struct regmap *versatile_syscon_map;
static struct regmap *versatile_ib2_map;
/*
* We detect the different syscon types from the compatible strings.
*/
enum versatile_clcd {
INTEGRATOR_CLCD_CM,
VERSATILE_CLCD,
REALVIEW_CLCD_EB,
REALVIEW_CLCD_PB1176,
REALVIEW_CLCD_PB11MP,
REALVIEW_CLCD_PBA8,
REALVIEW_CLCD_PBX,
};
static const struct of_device_id versatile_clcd_of_match[] = {
{
.compatible = "arm,core-module-integrator",
.data = (void *)INTEGRATOR_CLCD_CM,
},
{
.compatible = "arm,versatile-sysreg",
.data = (void *)VERSATILE_CLCD,
},
{
.compatible = "arm,realview-eb-syscon",
.data = (void *)REALVIEW_CLCD_EB,
},
{
.compatible = "arm,realview-pb1176-syscon",
.data = (void *)REALVIEW_CLCD_PB1176,
},
{
.compatible = "arm,realview-pb11mp-syscon",
.data = (void *)REALVIEW_CLCD_PB11MP,
},
{
.compatible = "arm,realview-pba8-syscon",
.data = (void *)REALVIEW_CLCD_PBA8,
},
{
.compatible = "arm,realview-pbx-syscon",
.data = (void *)REALVIEW_CLCD_PBX,
},
{},
};
/*
* Core module CLCD control on the Integrator/CP, bits
* 8 thru 19 of the CM_CONTROL register controls a bunch
* of CLCD settings.
*/
#define INTEGRATOR_HDR_CTRL_OFFSET 0x0C
#define INTEGRATOR_CLCD_LCDBIASEN BIT(8)
#define INTEGRATOR_CLCD_LCDBIASUP BIT(9)
#define INTEGRATOR_CLCD_LCDBIASDN BIT(10)
/* Bits 11,12,13 controls the LCD type */
#define INTEGRATOR_CLCD_LCDMUX_MASK (BIT(11)|BIT(12)|BIT(13))
#define INTEGRATOR_CLCD_LCDMUX_LCD24 BIT(11)
#define INTEGRATOR_CLCD_LCDMUX_VGA565 BIT(12)
#define INTEGRATOR_CLCD_LCDMUX_SHARP (BIT(11)|BIT(12))
#define INTEGRATOR_CLCD_LCDMUX_VGA555 BIT(13)
#define INTEGRATOR_CLCD_LCDMUX_VGA24 (BIT(11)|BIT(12)|BIT(13))
#define INTEGRATOR_CLCD_LCD0_EN BIT(14)
#define INTEGRATOR_CLCD_LCD1_EN BIT(15)
/* R/L flip on Sharp */
#define INTEGRATOR_CLCD_LCD_STATIC1 BIT(16)
/* U/D flip on Sharp */
#define INTEGRATOR_CLCD_LCD_STATIC2 BIT(17)
/* No connection on Sharp */
#define INTEGRATOR_CLCD_LCD_STATIC BIT(18)
/* 0 = 24bit VGA, 1 = 18bit VGA */
#define INTEGRATOR_CLCD_LCD_N24BITEN BIT(19)
#define INTEGRATOR_CLCD_MASK (INTEGRATOR_CLCD_LCDBIASEN | \
INTEGRATOR_CLCD_LCDBIASUP | \
INTEGRATOR_CLCD_LCDBIASDN | \
INTEGRATOR_CLCD_LCDMUX_MASK | \
INTEGRATOR_CLCD_LCD0_EN | \
INTEGRATOR_CLCD_LCD1_EN | \
INTEGRATOR_CLCD_LCD_STATIC1 | \
INTEGRATOR_CLCD_LCD_STATIC2 | \
INTEGRATOR_CLCD_LCD_STATIC | \
INTEGRATOR_CLCD_LCD_N24BITEN)
static void integrator_clcd_enable(struct clcd_fb *fb)
{
struct fb_var_screeninfo *var = &fb->fb.var;
u32 val;
dev_info(&fb->dev->dev, "enable Integrator CLCD connectors\n");
/* FIXME: really needed? */
val = INTEGRATOR_CLCD_LCD_STATIC1 | INTEGRATOR_CLCD_LCD_STATIC2 |
INTEGRATOR_CLCD_LCD0_EN | INTEGRATOR_CLCD_LCD1_EN;
if (var->bits_per_pixel <= 8 ||
(var->bits_per_pixel == 16 && var->green.length == 5))
/* Pseudocolor, RGB555, BGR555 */
val |= INTEGRATOR_CLCD_LCDMUX_VGA555;
else if (fb->fb.var.bits_per_pixel <= 16)
/* truecolor RGB565 */
val |= INTEGRATOR_CLCD_LCDMUX_VGA565;
else
val = 0; /* no idea for this, don't trust the docs */
regmap_update_bits(versatile_syscon_map,
INTEGRATOR_HDR_CTRL_OFFSET,
INTEGRATOR_CLCD_MASK,
val);
}
/*
* This configuration register in the Versatile and RealView
* family is uniformly present but appears more and more
* unutilized starting with the RealView series.
*/
#define SYS_CLCD 0x50
#define SYS_CLCD_MODE_MASK (BIT(0)|BIT(1))
#define SYS_CLCD_MODE_888 0
#define SYS_CLCD_MODE_5551 BIT(0)
#define SYS_CLCD_MODE_565_R_LSB BIT(1)
#define SYS_CLCD_MODE_565_B_LSB (BIT(0)|BIT(1))
#define SYS_CLCD_CONNECTOR_MASK (BIT(2)|BIT(3)|BIT(4)|BIT(5))
#define SYS_CLCD_NLCDIOON BIT(2)
#define SYS_CLCD_VDDPOSSWITCH BIT(3)
#define SYS_CLCD_PWR3V5SWITCH BIT(4)
#define SYS_CLCD_VDDNEGSWITCH BIT(5)
#define SYS_CLCD_TSNSS BIT(6) /* touchscreen enable */
#define SYS_CLCD_SSPEXP BIT(7) /* SSP expansion enable */
/* The Versatile can detect the connected panel type */
#define SYS_CLCD_CLCDID_MASK (BIT(8)|BIT(9)|BIT(10)|BIT(11)|BIT(12))
#define SYS_CLCD_ID_SANYO_3_8 (0x00 << 8)
#define SYS_CLCD_ID_SHARP_8_4 (0x01 << 8)
#define SYS_CLCD_ID_EPSON_2_2 (0x02 << 8)
#define SYS_CLCD_ID_SANYO_2_5 (0x07 << 8)
#define SYS_CLCD_ID_VGA (0x1f << 8)
#define SYS_CLCD_TSNDAV BIT(13) /* data ready from TS */
/* IB2 control register for the Versatile daughterboard */
#define IB2_CTRL 0x00
#define IB2_CTRL_LCD_SD BIT(1) /* 1 = shut down LCD */
#define IB2_CTRL_LCD_BL_ON BIT(0)
#define IB2_CTRL_LCD_MASK (BIT(0)|BIT(1))
static void versatile_clcd_disable(struct clcd_fb *fb)
{
dev_info(&fb->dev->dev, "disable Versatile CLCD connectors\n");
regmap_update_bits(versatile_syscon_map,
SYS_CLCD,
SYS_CLCD_CONNECTOR_MASK,
0);
/* If we're on an IB2 daughterboard, turn off display */
if (versatile_ib2_map) {
dev_info(&fb->dev->dev, "disable IB2 display\n");
regmap_update_bits(versatile_ib2_map,
IB2_CTRL,
IB2_CTRL_LCD_MASK,
IB2_CTRL_LCD_SD);
}
}
static void versatile_clcd_enable(struct clcd_fb *fb)
{
struct fb_var_screeninfo *var = &fb->fb.var;
u32 val = 0;
dev_info(&fb->dev->dev, "enable Versatile CLCD connectors\n");
switch (var->green.length) {
case 5:
val |= SYS_CLCD_MODE_5551;
break;
case 6:
if (var->red.offset == 0)
val |= SYS_CLCD_MODE_565_R_LSB;
else
val |= SYS_CLCD_MODE_565_B_LSB;
break;
case 8:
val |= SYS_CLCD_MODE_888;
break;
}
/* Set up the MUX */
regmap_update_bits(versatile_syscon_map,
SYS_CLCD,
SYS_CLCD_MODE_MASK,
val);
/* Then enable the display */
regmap_update_bits(versatile_syscon_map,
SYS_CLCD,
SYS_CLCD_CONNECTOR_MASK,
SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
/* If we're on an IB2 daughterboard, turn on display */
if (versatile_ib2_map) {
dev_info(&fb->dev->dev, "enable IB2 display\n");
regmap_update_bits(versatile_ib2_map,
IB2_CTRL,
IB2_CTRL_LCD_MASK,
IB2_CTRL_LCD_BL_ON);
}
}
static void versatile_clcd_decode(struct clcd_fb *fb, struct clcd_regs *regs)
{
clcdfb_decode(fb, regs);
/* Always clear BGR for RGB565: we do the routing externally */
if (fb->fb.var.green.length == 6)
regs->cntl &= ~CNTL_BGR;
}
static void realview_clcd_disable(struct clcd_fb *fb)
{
dev_info(&fb->dev->dev, "disable RealView CLCD connectors\n");
regmap_update_bits(versatile_syscon_map,
SYS_CLCD,
SYS_CLCD_CONNECTOR_MASK,
0);
}
static void realview_clcd_enable(struct clcd_fb *fb)
{
dev_info(&fb->dev->dev, "enable RealView CLCD connectors\n");
regmap_update_bits(versatile_syscon_map,
SYS_CLCD,
SYS_CLCD_CONNECTOR_MASK,
SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH);
}
struct versatile_panel {
u32 id;
char *compatible;
bool ib2;
};
static const struct versatile_panel versatile_panels[] = {
{
.id = SYS_CLCD_ID_VGA,
.compatible = "VGA",
},
{
.id = SYS_CLCD_ID_SANYO_3_8,
.compatible = "sanyo,tm38qv67a02a",
},
{
.id = SYS_CLCD_ID_SHARP_8_4,
.compatible = "sharp,lq084v1dg21",
},
{
.id = SYS_CLCD_ID_EPSON_2_2,
.compatible = "epson,l2f50113t00",
},
{
.id = SYS_CLCD_ID_SANYO_2_5,
.compatible = "sanyo,alr252rgt",
.ib2 = true,
},
};
static void versatile_panel_probe(struct device *dev,
struct device_node *endpoint)
{
struct versatile_panel const *vpanel = NULL;
struct device_node *panel = NULL;
u32 val;
int ret;
int i;
/*
* The Versatile CLCD has a panel auto-detection mechanism.
* We use this and look for the compatible panel in the
* device tree.
*/
ret = regmap_read(versatile_syscon_map, SYS_CLCD, &val);
if (ret) {
dev_err(dev, "cannot read CLCD syscon register\n");
return;
}
val &= SYS_CLCD_CLCDID_MASK;
/* First find corresponding panel information */
for (i = 0; i < ARRAY_SIZE(versatile_panels); i++) {
vpanel = &versatile_panels[i];
if (val == vpanel->id) {
dev_err(dev, "autodetected panel \"%s\"\n",
vpanel->compatible);
break;
}
}
if (i == ARRAY_SIZE(versatile_panels)) {
dev_err(dev, "could not auto-detect panel\n");
return;
}
panel = of_graph_get_remote_port_parent(endpoint);
if (!panel) {
dev_err(dev, "could not locate panel in DT\n");
return;
}
if (!of_device_is_compatible(panel, vpanel->compatible))
dev_err(dev, "panel in DT is not compatible with the "
"auto-detected panel, continuing anyway\n");
/*
* If we have a Sanyo 2.5" port
* that we're running on an IB2 and proceed to look for the
* IB2 syscon regmap.
*/
if (!vpanel->ib2)
return;
versatile_ib2_map = syscon_regmap_lookup_by_compatible(
"arm,versatile-ib2-syscon");
if (IS_ERR(versatile_ib2_map)) {
dev_err(dev, "could not locate IB2 control register\n");
versatile_ib2_map = NULL;
return;
}
}
int versatile_clcd_init_panel(struct clcd_fb *fb,
struct device_node *endpoint)
{
const struct of_device_id *clcd_id;
enum versatile_clcd versatile_clcd_type;
struct device_node *np;
struct regmap *map;
struct device *dev = &fb->dev->dev;
np = of_find_matching_node_and_match(NULL, versatile_clcd_of_match,
&clcd_id);
if (!np) {
/* Vexpress does not have this */
return 0;
}
versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
map = syscon_node_to_regmap(np);
if (IS_ERR(map)) {
dev_err(dev, "no Versatile syscon regmap\n");
return PTR_ERR(map);
}
switch (versatile_clcd_type) {
case INTEGRATOR_CLCD_CM:
versatile_syscon_map = map;
fb->board->enable = integrator_clcd_enable;
/* Override the caps, we have only these */
fb->board->caps = CLCD_CAP_5551 | CLCD_CAP_RGB565 |
CLCD_CAP_888;
dev_info(dev, "set up callbacks for Integrator PL110\n");
break;
case VERSATILE_CLCD:
versatile_syscon_map = map;
fb->board->enable = versatile_clcd_enable;
fb->board->disable = versatile_clcd_disable;
fb->board->decode = versatile_clcd_decode;
versatile_panel_probe(dev, endpoint);
dev_info(dev, "set up callbacks for Versatile\n");
break;
case REALVIEW_CLCD_EB:
case REALVIEW_CLCD_PB1176:
case REALVIEW_CLCD_PB11MP:
case REALVIEW_CLCD_PBA8:
case REALVIEW_CLCD_PBX:
versatile_syscon_map = map;
fb->board->enable = realview_clcd_enable;
fb->board->disable = realview_clcd_disable;
dev_info(dev, "set up callbacks for RealView PL111\n");
break;
default:
dev_info(dev, "unknown Versatile system controller\n");
break;
}
return 0;
}
EXPORT_SYMBOL_GPL(versatile_clcd_init_panel);
#endif
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