366 lines
9.1 KiB
C
366 lines
9.1 KiB
C
/*
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* platform.c - bus/device related devicetree functions
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*
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* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* based on Linux devicetree support
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <malloc.h>
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#include <of.h>
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#include <of_address.h>
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#include <linux/amba/bus.h>
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/**
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* of_find_device_by_node - Find the platform_device associated with a node
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* @np: Pointer to device tree node
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*
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* Returns platform_device pointer, or NULL if not found
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*/
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struct device_d *of_find_device_by_node(struct device_node *np)
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{
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struct device_d *dev;
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for_each_device(dev)
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if (dev->device_node == np)
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return dev;
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return NULL;
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}
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EXPORT_SYMBOL(of_find_device_by_node);
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/**
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* of_device_make_bus_id - Use the device node data to assign a unique name
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* @dev: pointer to device structure that is linked to a device tree node
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*
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* This routine will first try using either the dcr-reg or the reg property
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* value to derive a unique name. As a last resort it will use the node
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* name followed by a unique number.
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*/
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static void of_device_make_bus_id(struct device_d *dev)
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{
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static int bus_no_reg_magic;
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struct device_node *np = dev->device_node;
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const __be32 *reg, *addrp;
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u64 addr;
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char *name, *at;
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name = xstrdup(np->name);
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at = strchr(name, '@');
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if (at)
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*at = '\0';
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#ifdef CONFIG_PPC_DCR
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/*
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* If it's a DCR based device, use 'd' for native DCRs
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* and 'D' for MMIO DCRs.
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*/
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reg = of_get_property(np, "dcr-reg", NULL);
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if (reg) {
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#ifdef CONFIG_PPC_DCR_NATIVE
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snprintf(dev->name, MAX_DRIVER_NAME, "d%x.%s", *reg, name);
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#else /* CONFIG_PPC_DCR_NATIVE */
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u64 addr = of_translate_dcr_address(np, *reg, NULL);
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if (addr != OF_BAD_ADDR) {
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snprintf(dev->name, MAX_DRIVER_NAME, "D%llx.%s",
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(unsigned long long)addr, name);
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free(name);
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return;
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}
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#endif /* !CONFIG_PPC_DCR_NATIVE */
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}
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#endif /* CONFIG_PPC_DCR */
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/*
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* For MMIO, get the physical address
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*/
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reg = of_get_property(np, "reg", NULL);
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if (reg) {
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if (of_can_translate_address(np)) {
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addr = of_translate_address(np, reg);
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} else {
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addrp = of_get_address(np, 0, NULL, NULL);
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if (addrp)
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addr = of_read_number(addrp, 1);
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else
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addr = OF_BAD_ADDR;
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}
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if (addr != OF_BAD_ADDR) {
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snprintf(dev->name, MAX_DRIVER_NAME, "%llx.%s",
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(unsigned long long)addr, name);
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free(name);
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return;
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}
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}
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/*
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* No BusID, use the node name and add a globally incremented counter
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*/
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snprintf(dev->name, MAX_DRIVER_NAME, "%s.%d", name, bus_no_reg_magic++);
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free(name);
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}
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/**
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* of_platform_device_create - Alloc, initialize and register an of_device
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* @np: pointer to node to create device for
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* @parent: device model parent device.
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*
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* Returns pointer to created platform device, or NULL if a device was not
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* registered. Unavailable devices will not get registered.
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*/
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struct device_d *of_platform_device_create(struct device_node *np,
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struct device_d *parent)
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{
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struct device_d *dev;
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struct resource *res = NULL, temp_res;
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int i, j, ret, num_reg = 0, match;
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if (!of_device_is_available(np))
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return NULL;
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/* count the io resources */
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if (of_can_translate_address(np))
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while (of_address_to_resource(np, num_reg, &temp_res) == 0)
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num_reg++;
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/* Populate the resource table */
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if (num_reg) {
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res = xzalloc(sizeof(*res) * num_reg);
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for (i = 0; i < num_reg; i++) {
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ret = of_address_to_resource(np, i, &res[i]);
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if (ret) {
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free(res);
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return NULL;
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}
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}
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/*
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* A device may already be registered as platform_device.
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* Instead of registering the same device again, just
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* add this node to the existing device.
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*/
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for_each_device(dev) {
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if (!dev->resource)
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continue;
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for (i = 0, match = 0; i < num_reg; i++)
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for (j = 0; j < dev->num_resources; j++)
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if (dev->resource[j].start ==
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res[i].start &&
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dev->resource[j].end ==
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res[i].end) {
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match++;
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break;
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}
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/* check if all address resources match */
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if (match == num_reg) {
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debug("connecting %s to %s\n",
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np->name, dev_name(dev));
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dev->device_node = np;
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free(res);
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return dev;
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}
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}
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}
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/* setup generic device info */
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dev = xzalloc(sizeof(*dev));
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dev->id = DEVICE_ID_SINGLE;
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dev->device_node = np;
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dev->parent = parent;
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dev->resource = res;
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dev->num_resources = num_reg;
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of_device_make_bus_id(dev);
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debug("%s: register device %s, io=" PRINTF_CONVERSION_RESOURCE "\n",
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__func__, dev_name(dev),
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(num_reg) ? dev->resource[0].start : (-1));
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ret = platform_device_register(dev);
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if (!ret)
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return dev;
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free(dev);
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if (num_reg)
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free(res);
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return NULL;
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}
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/**
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* of_device_enable_and_register - Enable and register device
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* @np: pointer to node to enable create device for
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*
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* Returns pointer to created platform device, or NULL if a device was not
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* registered. Unavailable devices will not get registered.
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*/
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struct device_d *of_device_enable_and_register(struct device_node *np)
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{
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struct device_d *dev;
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of_device_enable(np);
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dev = of_platform_device_create(np, NULL);
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if (!dev)
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return NULL;
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return dev;
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}
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EXPORT_SYMBOL(of_device_enable_and_register);
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/**
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* of_device_enable_and_register_by_name - Enable and register device by name
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* @name: name or path of the device node
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*
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* Returns pointer to created platform device, or NULL if a device was not
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* registered. Unavailable devices will not get registered.
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*/
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struct device_d *of_device_enable_and_register_by_name(const char *name)
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{
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struct device_node *node;
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node = of_find_node_by_name(NULL, name);
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if (!node)
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node = of_find_node_by_path(name);
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if (!node)
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return NULL;
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return of_device_enable_and_register(node);
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}
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EXPORT_SYMBOL(of_device_enable_and_register_by_name);
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#ifdef CONFIG_ARM_AMBA
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static struct device_d *of_amba_device_create(struct device_node *np)
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{
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struct amba_device *dev;
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int ret;
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debug("Creating amba device %s\n", np->full_name);
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if (!of_device_is_available(np))
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return NULL;
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dev = xzalloc(sizeof(*dev));
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/* setup generic device info */
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dev->dev.id = DEVICE_ID_SINGLE;
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dev->dev.device_node = np;
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of_device_make_bus_id(&dev->dev);
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ret = of_address_to_resource(np, 0, &dev->res);
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if (ret)
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goto amba_err_free;
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dev->dev.resource = &dev->res;
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dev->dev.num_resources = 1;
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/* Allow the HW Peripheral ID to be overridden */
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of_property_read_u32(np, "arm,primecell-periphid", &dev->periphid);
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debug("register device 0x%08x\n", dev->dev.resource[0].start);
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ret = amba_device_add(dev);
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if (ret)
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goto amba_err_free;
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return &dev->dev;
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amba_err_free:
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free(dev);
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return NULL;
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}
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#else /* CONFIG_ARM_AMBA */
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static inline struct amba_device *of_amba_device_create(struct device_node *np)
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{
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return NULL;
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}
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#endif /* CONFIG_ARM_AMBA */
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/**
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* of_platform_bus_create() - Create a device for a node and its children.
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* @bus: device node of the bus to instantiate
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* @matches: match table for bus nodes
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* @parent: parent for new device, or NULL for top level.
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*
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* Creates a platform_device for the provided device_node, and optionally
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* recursively create devices for all the child nodes.
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*/
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static int of_platform_bus_create(struct device_node *bus,
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const struct of_device_id *matches,
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struct device_d *parent)
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{
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struct device_node *child;
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struct device_d *dev;
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int rc = 0;
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/* Make sure it has a compatible property */
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if (!of_get_property(bus, "compatible", NULL)) {
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pr_debug("%s() - skipping %s, no compatible prop\n",
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__func__, bus->full_name);
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return 0;
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}
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if (of_device_is_compatible(bus, "arm,primecell")) {
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if (of_amba_device_create(bus))
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return 0;
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}
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dev = of_platform_device_create(bus, parent);
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if (!dev || !of_match_node(matches, bus))
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return 0;
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for_each_child_of_node(bus, child) {
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pr_debug(" create child: %s\n", child->full_name);
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rc = of_platform_bus_create(child, matches, dev);
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if (rc)
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break;
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}
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return rc;
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}
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/**
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* of_platform_populate() - Populate platform_devices from device tree data
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* @root: parent of the first level to probe or NULL for the root of the tree
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* @matches: match table, NULL to use the default
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* @parent: parent to hook devices from, NULL for toplevel
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*
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* This function walks the device tree given by @root node and creates devices
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* from nodes. It requires all device nodes to have a 'compatible' property,
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* and it is suitable for creating devices which are children of the root
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* node.
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*
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* Returns 0 on success, < 0 on failure.
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*/
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int of_platform_populate(struct device_node *root,
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const struct of_device_id *matches,
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struct device_d *parent)
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{
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struct device_node *child;
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int rc = 0;
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if (!root)
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root = of_find_node_by_path("/");
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if (!root)
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return -EINVAL;
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for_each_child_of_node(root, child) {
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rc = of_platform_bus_create(child, matches, parent);
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if (rc)
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break;
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}
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return rc;
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}
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EXPORT_SYMBOL_GPL(of_platform_populate);
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