diff options
Diffstat (limited to 'drivers/gpu/drm/pl111/pl111_versatile.c')
| -rw-r--r-- | drivers/gpu/drm/pl111/pl111_versatile.c | 232 |
1 files changed, 192 insertions, 40 deletions
diff --git a/drivers/gpu/drm/pl111/pl111_versatile.c b/drivers/gpu/drm/pl111/pl111_versatile.c index 38f4ee05285e..bdd883f4f0da 100644 --- a/drivers/gpu/drm/pl111/pl111_versatile.c +++ b/drivers/gpu/drm/pl111/pl111_versatile.c @@ -1,15 +1,24 @@ // SPDX-License-Identifier: GPL-2.0-only -#include <linux/amba/clcd-regs.h> + +/* + * Versatile family (ARM reference designs) handling for the PL11x. + * This is based on code and know-how in the previous frame buffer + * driver in drivers/video/fbdev/amba-clcd.c: + * Copyright (C) 2001 ARM Limited, by David A Rusling + * Updated to 2.5 by Deep Blue Solutions Ltd. + * Major contributions and discoveries by Russell King. + */ + +#include <linux/bitops.h> #include <linux/device.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/regmap.h> -#include <linux/mfd/syscon.h> -#include <linux/bitops.h> -#include <linux/module.h> -#include <drm/drmP.h> +#include <linux/vexpress.h> + #include "pl111_versatile.h" -#include "pl111_vexpress.h" #include "pl111_drm.h" static struct regmap *versatile_syscon_map; @@ -18,6 +27,7 @@ static struct regmap *versatile_syscon_map; * We detect the different syscon types from the compatible strings. */ enum versatile_clcd { + INTEGRATOR_IMPD1, INTEGRATOR_CLCD_CM, VERSATILE_CLCD, REALVIEW_CLCD_EB, @@ -64,6 +74,14 @@ static const struct of_device_id versatile_clcd_of_match[] = { {}, }; +static const struct of_device_id impd1_clcd_of_match[] = { + { + .compatible = "arm,im-pd1-syscon", + .data = (void *)INTEGRATOR_IMPD1, + }, + {}, +}; + /* * Core module CLCD control on the Integrator/CP, bits * 8 thru 19 of the CM_CONTROL register controls a bunch @@ -124,6 +142,36 @@ static void pl111_integrator_enable(struct drm_device *drm, u32 format) val); } +#define IMPD1_CTRL_OFFSET 0x18 +#define IMPD1_CTRL_DISP_LCD (0 << 0) +#define IMPD1_CTRL_DISP_VGA (1 << 0) +#define IMPD1_CTRL_DISP_LCD1 (2 << 0) +#define IMPD1_CTRL_DISP_ENABLE (1 << 2) +#define IMPD1_CTRL_DISP_MASK (7 << 0) + +static void pl111_impd1_enable(struct drm_device *drm, u32 format) +{ + u32 val; + + dev_info(drm->dev, "enable IM-PD1 CLCD connectors\n"); + val = IMPD1_CTRL_DISP_VGA | IMPD1_CTRL_DISP_ENABLE; + + regmap_update_bits(versatile_syscon_map, + IMPD1_CTRL_OFFSET, + IMPD1_CTRL_DISP_MASK, + val); +} + +static void pl111_impd1_disable(struct drm_device *drm) +{ + dev_info(drm->dev, "disable IM-PD1 CLCD connectors\n"); + + regmap_update_bits(versatile_syscon_map, + IMPD1_CTRL_OFFSET, + IMPD1_CTRL_DISP_MASK, + 0); +} + /* * This configuration register in the Versatile and RealView * family is uniformly present but appears more and more @@ -270,6 +318,20 @@ static const struct pl111_variant_data pl110_integrator = { }; /* + * The IM-PD1 variant is a PL110 with a bunch of broken, or not + * yet implemented features + */ +static const struct pl111_variant_data pl110_impd1 = { + .name = "PL110 IM-PD1", + .is_pl110 = true, + .broken_clockdivider = true, + .broken_vblank = true, + .formats = pl110_integrator_pixel_formats, + .nformats = ARRAY_SIZE(pl110_integrator_pixel_formats), + .fb_bpp = 16, +}; + +/* * This is the in-between PL110 variant found in the ARM Versatile, * supporting RGB565/BGR565 */ @@ -307,13 +369,110 @@ static const struct pl111_variant_data pl111_vexpress = { .broken_clockdivider = true, }; +#define VEXPRESS_FPGAMUX_MOTHERBOARD 0x00 +#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_1 0x01 +#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_2 0x02 + +static int pl111_vexpress_clcd_init(struct device *dev, struct device_node *np, + struct pl111_drm_dev_private *priv) +{ + struct platform_device *pdev; + struct device_node *root; + struct device_node *child; + struct device_node *ct_clcd = NULL; + struct regmap *map; + bool has_coretile_clcd = false; + bool has_coretile_hdlcd = false; + bool mux_motherboard = true; + u32 val; + int ret; + + if (!IS_ENABLED(CONFIG_VEXPRESS_CONFIG)) + return -ENODEV; + + /* + * Check if we have a CLCD or HDLCD on the core tile by checking if a + * CLCD or HDLCD is available in the root of the device tree. + */ + root = of_find_node_by_path("/"); + if (!root) + return -EINVAL; + + for_each_available_child_of_node(root, child) { + if (of_device_is_compatible(child, "arm,pl111")) { + has_coretile_clcd = true; + ct_clcd = child; + break; + } + if (of_device_is_compatible(child, "arm,hdlcd")) { + has_coretile_hdlcd = true; + of_node_put(child); + break; + } + } + + of_node_put(root); + + /* + * If there is a coretile HDLCD and it has a driver, + * do not mux the CLCD on the motherboard to the DVI. + */ + if (has_coretile_hdlcd && IS_ENABLED(CONFIG_DRM_HDLCD)) + mux_motherboard = false; + + /* + * On the Vexpress CA9 we let the CLCD on the coretile + * take precedence, so also in this case do not mux the + * motherboard to the DVI. + */ + if (has_coretile_clcd) + mux_motherboard = false; + + if (mux_motherboard) { + dev_info(dev, "DVI muxed to motherboard CLCD\n"); + val = VEXPRESS_FPGAMUX_MOTHERBOARD; + } else if (ct_clcd == dev->of_node) { + dev_info(dev, + "DVI muxed to daughterboard 1 (core tile) CLCD\n"); + val = VEXPRESS_FPGAMUX_DAUGHTERBOARD_1; + } else { + dev_info(dev, "core tile graphics present\n"); + dev_info(dev, "this device will be deactivated\n"); + return -ENODEV; + } + + /* Call into deep Vexpress configuration API */ + pdev = of_find_device_by_node(np); + if (!pdev) { + dev_err(dev, "can't find the sysreg device, deferring\n"); + return -EPROBE_DEFER; + } + + map = devm_regmap_init_vexpress_config(&pdev->dev); + if (IS_ERR(map)) { + platform_device_put(pdev); + return PTR_ERR(map); + } + + ret = regmap_write(map, 0, val); + platform_device_put(pdev); + if (ret) { + dev_err(dev, "error setting DVI muxmode\n"); + return -ENODEV; + } + + priv->variant = &pl111_vexpress; + dev_info(dev, "initializing Versatile Express PL111\n"); + + return 0; +} + int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv) { const struct of_device_id *clcd_id; enum versatile_clcd versatile_clcd_type; struct device_node *np; struct regmap *map; - int ret; np = of_find_matching_node_and_match(NULL, versatile_clcd_of_match, &clcd_id); @@ -321,39 +480,32 @@ int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv) /* Non-ARM reference designs, just bail out */ return 0; } + versatile_clcd_type = (enum versatile_clcd)clcd_id->data; /* Versatile Express special handling */ if (versatile_clcd_type == VEXPRESS_CLCD_V2M) { - struct platform_device *pdev; - - /* Registers a driver for the muxfpga */ - ret = vexpress_muxfpga_init(); - if (ret) { - dev_err(dev, "unable to initialize muxfpga driver\n"); - of_node_put(np); - return ret; - } + int ret = pl111_vexpress_clcd_init(dev, np, priv); + of_node_put(np); + if (ret) + dev_err(dev, "Versatile Express init failed - %d", ret); + return ret; + } - /* Call into deep Vexpress configuration API */ - pdev = of_find_device_by_node(np); - if (!pdev) { - dev_err(dev, "can't find the sysreg device, deferring\n"); - of_node_put(np); - return -EPROBE_DEFER; - } - map = dev_get_drvdata(&pdev->dev); - if (!map) { - dev_err(dev, "sysreg has not yet probed\n"); - platform_device_put(pdev); - of_node_put(np); - return -EPROBE_DEFER; - } - } else { - map = syscon_node_to_regmap(np); + /* + * On the Integrator, check if we should use the IM-PD1 instead, + * if we find it, it will take precedence. This is on the Integrator/AP + * which only has this option for PL110 graphics. + */ + if (versatile_clcd_type == INTEGRATOR_CLCD_CM) { + np = of_find_matching_node_and_match(NULL, impd1_clcd_of_match, + &clcd_id); + if (np) + versatile_clcd_type = (enum versatile_clcd)clcd_id->data; } - of_node_put(np); + map = syscon_node_to_regmap(np); + of_node_put(np); if (IS_ERR(map)) { dev_err(dev, "no Versatile syscon regmap\n"); return PTR_ERR(map); @@ -366,6 +518,13 @@ int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv) priv->variant_display_enable = pl111_integrator_enable; dev_info(dev, "set up callbacks for Integrator PL110\n"); break; + case INTEGRATOR_IMPD1: + versatile_syscon_map = map; + priv->variant = &pl110_impd1; + priv->variant_display_enable = pl111_impd1_enable; + priv->variant_display_disable = pl111_impd1_disable; + dev_info(dev, "set up callbacks for IM-PD1 PL110\n"); + break; case VERSATILE_CLCD: versatile_syscon_map = map; /* This can do RGB565 with external PLD */ @@ -392,13 +551,6 @@ int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv) priv->variant_display_disable = pl111_realview_clcd_disable; dev_info(dev, "set up callbacks for RealView PL111\n"); break; - case VEXPRESS_CLCD_V2M: - priv->variant = &pl111_vexpress; - dev_info(dev, "initializing Versatile Express PL111\n"); - ret = pl111_vexpress_clcd_init(dev, priv, map); - if (ret) - return ret; - break; default: dev_info(dev, "unknown Versatile system controller\n"); break; |