diff options
Diffstat (limited to 'drivers/video/fbdev/amba-clcd-versatile.c')
| -rw-r--r-- | drivers/video/fbdev/amba-clcd-versatile.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/drivers/video/fbdev/amba-clcd-versatile.c b/drivers/video/fbdev/amba-clcd-versatile.c index a8a22daa3f9d..9a90817b1550 100644 --- a/drivers/video/fbdev/amba-clcd-versatile.c +++ b/drivers/video/fbdev/amba-clcd-versatile.c @@ -3,6 +3,12 @@ #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 = { @@ -178,3 +184,388 @@ 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_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"); + + 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, + 0, + INTEGRATOR_CLCD_MASK); +} + +/* + * 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) { + dev_err(dev, "no Versatile syscon node\n"); + return -ENODEV; + } + versatile_clcd_type = (enum versatile_clcd)clcd_id->data; + + map = syscon_node_to_regmap(np); + if (!map) { + dev_err(dev, "no Versatile syscon regmap\n"); + return -ENODEV; + } + + 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; +} + +#endif |