linux/drivers/bus/omap-ocp2scp.c
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   1/*
   2 * omap-ocp2scp.c - transform ocp interface protocol to scp protocol
   3 *
   4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * Author: Kishon Vijay Abraham I <kishon@ti.com>
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 */
  18
  19#include <linux/module.h>
  20#include <linux/platform_device.h>
  21#include <linux/err.h>
  22#include <linux/pm_runtime.h>
  23#include <linux/of.h>
  24#include <linux/of_platform.h>
  25#include <linux/platform_data/omap_ocp2scp.h>
  26
  27/**
  28 * _count_resources - count for the number of resources
  29 * @res: struct resource *
  30 *
  31 * Count and return the number of resources populated for the device that is
  32 * connected to ocp2scp.
  33 */
  34static unsigned _count_resources(struct resource *res)
  35{
  36        int cnt = 0;
  37
  38        while (res->start != res->end) {
  39                cnt++;
  40                res++;
  41        }
  42
  43        return cnt;
  44}
  45
  46static int ocp2scp_remove_devices(struct device *dev, void *c)
  47{
  48        struct platform_device *pdev = to_platform_device(dev);
  49
  50        platform_device_unregister(pdev);
  51
  52        return 0;
  53}
  54
  55static int __devinit omap_ocp2scp_probe(struct platform_device *pdev)
  56{
  57        int ret;
  58        unsigned res_cnt, i;
  59        struct device_node *np = pdev->dev.of_node;
  60        struct platform_device *pdev_child;
  61        struct omap_ocp2scp_platform_data *pdata = pdev->dev.platform_data;
  62        struct omap_ocp2scp_dev *dev;
  63
  64        if (np) {
  65                ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
  66                if (ret) {
  67                        dev_err(&pdev->dev,
  68                            "failed to add resources for ocp2scp child\n");
  69                        goto err0;
  70                }
  71        } else if (pdata) {
  72                for (i = 0, dev = *pdata->devices; i < pdata->dev_cnt; i++,
  73                    dev++) {
  74                        res_cnt = _count_resources(dev->res);
  75
  76                        pdev_child = platform_device_alloc(dev->drv_name,
  77                            PLATFORM_DEVID_AUTO);
  78                        if (!pdev_child) {
  79                                dev_err(&pdev->dev,
  80                                  "failed to allocate mem for ocp2scp child\n");
  81                                goto err0;
  82                        }
  83
  84                        ret = platform_device_add_resources(pdev_child,
  85                            dev->res, res_cnt);
  86                        if (ret) {
  87                                dev_err(&pdev->dev,
  88                                 "failed to add resources for ocp2scp child\n");
  89                                goto err1;
  90                        }
  91
  92                        pdev_child->dev.parent  = &pdev->dev;
  93
  94                        ret = platform_device_add(pdev_child);
  95                        if (ret) {
  96                                dev_err(&pdev->dev,
  97                                   "failed to register ocp2scp child device\n");
  98                                goto err1;
  99                        }
 100                }
 101        } else {
 102                dev_err(&pdev->dev, "OCP2SCP initialized without plat data\n");
 103                return -EINVAL;
 104        }
 105
 106        pm_runtime_enable(&pdev->dev);
 107
 108        return 0;
 109
 110err1:
 111        platform_device_put(pdev_child);
 112
 113err0:
 114        device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
 115
 116        return ret;
 117}
 118
 119static int __devexit omap_ocp2scp_remove(struct platform_device *pdev)
 120{
 121        pm_runtime_disable(&pdev->dev);
 122        device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
 123
 124        return 0;
 125}
 126
 127#ifdef CONFIG_OF
 128static const struct of_device_id omap_ocp2scp_id_table[] = {
 129        { .compatible = "ti,omap-ocp2scp" },
 130        {}
 131};
 132MODULE_DEVICE_TABLE(of, omap_ocp2scp_id_table);
 133#endif
 134
 135static struct platform_driver omap_ocp2scp_driver = {
 136        .probe          = omap_ocp2scp_probe,
 137        .remove         = __devexit_p(omap_ocp2scp_remove),
 138        .driver         = {
 139                .name   = "omap-ocp2scp",
 140                .owner  = THIS_MODULE,
 141                .of_match_table = of_match_ptr(omap_ocp2scp_id_table),
 142        },
 143};
 144
 145module_platform_driver(omap_ocp2scp_driver);
 146
 147MODULE_ALIAS("platform: omap-ocp2scp");
 148MODULE_AUTHOR("Texas Instruments Inc.");
 149MODULE_DESCRIPTION("OMAP OCP2SCP driver");
 150MODULE_LICENSE("GPL v2");
 151
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