324 lines
8 KiB
C
Executable file
324 lines
8 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/*
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* rcar_du_of.c - Legacy DT bindings compatibility
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*
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* Copyright (C) 2018 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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* Based on work from Jyri Sarha <jsarha@ti.com>
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* Copyright (C) 2015 Texas Instruments
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_fdt.h>
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#include <linux/of_graph.h>
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#include <linux/slab.h>
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#include "rcar_du_crtc.h"
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#include "rcar_du_drv.h"
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#include "rcar_du_of.h"
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/* -----------------------------------------------------------------------------
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* Generic Overlay Handling
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*/
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struct rcar_du_of_overlay {
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const char *compatible;
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void *begin;
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void *end;
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};
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#define RCAR_DU_OF_DTB(type, soc) \
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extern char __dtb_rcar_du_of_##type##_##soc##_begin[]; \
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extern char __dtb_rcar_du_of_##type##_##soc##_end[]
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#define RCAR_DU_OF_OVERLAY(type, soc) \
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{ \
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.compatible = "renesas,du-" #soc, \
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.begin = __dtb_rcar_du_of_##type##_##soc##_begin, \
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.end = __dtb_rcar_du_of_##type##_##soc##_end, \
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}
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static int __init rcar_du_of_apply_overlay(const struct rcar_du_of_overlay *dtbs,
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const char *compatible)
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{
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const struct rcar_du_of_overlay *dtb = NULL;
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unsigned int i;
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int ovcs_id;
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for (i = 0; dtbs[i].compatible; ++i) {
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if (!strcmp(dtbs[i].compatible, compatible)) {
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dtb = &dtbs[i];
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break;
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}
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}
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if (!dtb)
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return -ENODEV;
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ovcs_id = 0;
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return of_overlay_fdt_apply(dtb->begin, dtb->end - dtb->begin,
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&ovcs_id);
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}
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static int __init rcar_du_of_add_property(struct of_changeset *ocs,
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struct device_node *np,
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const char *name, const void *value,
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int length)
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{
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struct property *prop;
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int ret = -ENOMEM;
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prop = kzalloc(sizeof(*prop), GFP_KERNEL);
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if (!prop)
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return -ENOMEM;
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prop->name = kstrdup(name, GFP_KERNEL);
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if (!prop->name)
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goto out_err;
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prop->value = kmemdup(value, length, GFP_KERNEL);
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if (!prop->value)
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goto out_err;
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of_property_set_flag(prop, OF_DYNAMIC);
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prop->length = length;
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ret = of_changeset_add_property(ocs, np, prop);
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if (!ret)
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return 0;
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out_err:
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kfree(prop->value);
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kfree(prop->name);
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kfree(prop);
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return ret;
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}
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/* -----------------------------------------------------------------------------
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* LVDS Overlays
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*/
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RCAR_DU_OF_DTB(lvds, r8a7790);
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RCAR_DU_OF_DTB(lvds, r8a7791);
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RCAR_DU_OF_DTB(lvds, r8a7793);
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RCAR_DU_OF_DTB(lvds, r8a7795);
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RCAR_DU_OF_DTB(lvds, r8a7796);
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static const struct rcar_du_of_overlay rcar_du_lvds_overlays[] __initconst = {
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RCAR_DU_OF_OVERLAY(lvds, r8a7790),
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RCAR_DU_OF_OVERLAY(lvds, r8a7791),
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RCAR_DU_OF_OVERLAY(lvds, r8a7793),
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RCAR_DU_OF_OVERLAY(lvds, r8a7795),
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RCAR_DU_OF_OVERLAY(lvds, r8a7796),
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{ /* Sentinel */ },
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};
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static struct of_changeset rcar_du_lvds_changeset;
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static void __init rcar_du_of_lvds_patch_one(struct device_node *lvds,
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const struct of_phandle_args *clk,
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struct device_node *local,
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struct device_node *remote)
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{
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unsigned int psize;
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unsigned int i;
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__be32 value[4];
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int ret;
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/*
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* Set the LVDS clocks property. This can't be performed by the overlay
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* as the structure of the clock specifier has changed over time, and we
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* don't know at compile time which binding version the system we will
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* run on uses.
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*/
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if (clk->args_count >= ARRAY_SIZE(value) - 1)
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return;
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of_changeset_init(&rcar_du_lvds_changeset);
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value[0] = cpu_to_be32(clk->np->phandle);
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for (i = 0; i < clk->args_count; ++i)
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value[i + 1] = cpu_to_be32(clk->args[i]);
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psize = (clk->args_count + 1) * 4;
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ret = rcar_du_of_add_property(&rcar_du_lvds_changeset, lvds,
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"clocks", value, psize);
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if (ret < 0)
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goto done;
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/*
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* Insert the node in the OF graph: patch the LVDS ports remote-endpoint
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* properties to point to the endpoints of the sibling nodes in the
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* graph. This can't be performed by the overlay: on the input side the
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* overlay would contain a phandle for the DU LVDS output port that
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* would clash with the system DT, and on the output side the connection
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* is board-specific.
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*/
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value[0] = cpu_to_be32(local->phandle);
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value[1] = cpu_to_be32(remote->phandle);
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for (i = 0; i < 2; ++i) {
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struct device_node *endpoint;
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endpoint = of_graph_get_endpoint_by_regs(lvds, i, 0);
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if (!endpoint) {
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ret = -EINVAL;
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goto done;
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}
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ret = rcar_du_of_add_property(&rcar_du_lvds_changeset,
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endpoint, "remote-endpoint",
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&value[i], sizeof(value[i]));
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of_node_put(endpoint);
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if (ret < 0)
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goto done;
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}
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ret = of_changeset_apply(&rcar_du_lvds_changeset);
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done:
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if (ret < 0)
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of_changeset_destroy(&rcar_du_lvds_changeset);
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}
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struct lvds_of_data {
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struct resource res;
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struct of_phandle_args clkspec;
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struct device_node *local;
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struct device_node *remote;
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};
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static void __init rcar_du_of_lvds_patch(const struct of_device_id *of_ids)
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{
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const struct rcar_du_device_info *info;
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const struct of_device_id *match;
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struct lvds_of_data lvds_data[2] = { };
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struct device_node *lvds_node;
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struct device_node *soc_node;
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struct device_node *du_node;
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char compatible[22];
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const char *soc_name;
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unsigned int i;
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int ret;
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/* Get the DU node and exit if not present or disabled. */
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du_node = of_find_matching_node_and_match(NULL, of_ids, &match);
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if (!du_node || !of_device_is_available(du_node)) {
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of_node_put(du_node);
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return;
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}
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info = match->data;
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soc_node = of_get_parent(du_node);
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if (WARN_ON(info->num_lvds > ARRAY_SIZE(lvds_data)))
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goto done;
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/*
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* Skip if the LVDS nodes already exists.
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*
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* The nodes are searched based on the compatible string, which we
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* construct from the SoC name found in the DU compatible string. As a
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* match has been found we know the compatible string matches the
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* expected format and can thus skip some of the string manipulation
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* normal safety checks.
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*/
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soc_name = strchr(match->compatible, '-') + 1;
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sprintf(compatible, "renesas,%s-lvds", soc_name);
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lvds_node = of_find_compatible_node(NULL, NULL, compatible);
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if (lvds_node) {
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of_node_put(lvds_node);
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return;
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}
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/*
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* Parse the DU node and store the register specifier, the clock
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* specifier and the local and remote endpoint of the LVDS link for
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* later use.
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*/
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for (i = 0; i < info->num_lvds; ++i) {
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struct lvds_of_data *lvds = &lvds_data[i];
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unsigned int port;
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char name[7];
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int index;
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sprintf(name, "lvds.%u", i);
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index = of_property_match_string(du_node, "clock-names", name);
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if (index < 0)
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continue;
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ret = of_parse_phandle_with_args(du_node, "clocks",
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"#clock-cells", index,
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&lvds->clkspec);
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if (ret < 0)
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continue;
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port = info->routes[RCAR_DU_OUTPUT_LVDS0 + i].port;
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lvds->local = of_graph_get_endpoint_by_regs(du_node, port, 0);
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if (!lvds->local)
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continue;
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lvds->remote = of_graph_get_remote_endpoint(lvds->local);
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if (!lvds->remote)
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continue;
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index = of_property_match_string(du_node, "reg-names", name);
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if (index < 0)
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continue;
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of_address_to_resource(du_node, index, &lvds->res);
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}
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/* Parse and apply the overlay. This will resolve phandles. */
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ret = rcar_du_of_apply_overlay(rcar_du_lvds_overlays,
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match->compatible);
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if (ret < 0)
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goto done;
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/* Patch the newly created LVDS encoder nodes. */
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for_each_child_of_node(soc_node, lvds_node) {
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struct resource res;
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if (!of_device_is_compatible(lvds_node, compatible))
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continue;
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/* Locate the lvds_data entry based on the resource start. */
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ret = of_address_to_resource(lvds_node, 0, &res);
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if (ret < 0)
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continue;
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for (i = 0; i < ARRAY_SIZE(lvds_data); ++i) {
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if (lvds_data[i].res.start == res.start)
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break;
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}
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if (i == ARRAY_SIZE(lvds_data))
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continue;
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/* Patch the LVDS encoder. */
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rcar_du_of_lvds_patch_one(lvds_node, &lvds_data[i].clkspec,
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lvds_data[i].local,
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lvds_data[i].remote);
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}
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done:
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for (i = 0; i < info->num_lvds; ++i) {
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of_node_put(lvds_data[i].clkspec.np);
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of_node_put(lvds_data[i].local);
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of_node_put(lvds_data[i].remote);
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}
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of_node_put(soc_node);
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of_node_put(du_node);
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}
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void __init rcar_du_of_init(const struct of_device_id *of_ids)
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{
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rcar_du_of_lvds_patch(of_ids);
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}
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