+++ /dev/null
-/*
- * Copyright (C) 2007 Google, Inc.
- * Copyright (C) 2011 Intel, Inc.
- * Copyright (C) 2013 Intel, Inc.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/io.h>
-
-#define PDEV_BUS_OP_DONE (0x00)
-#define PDEV_BUS_OP_REMOVE_DEV (0x04)
-#define PDEV_BUS_OP_ADD_DEV (0x08)
-
-#define PDEV_BUS_OP_INIT (0x00)
-
-#define PDEV_BUS_OP (0x00)
-#define PDEV_BUS_GET_NAME (0x04)
-#define PDEV_BUS_NAME_LEN (0x08)
-#define PDEV_BUS_ID (0x0c)
-#define PDEV_BUS_IO_BASE (0x10)
-#define PDEV_BUS_IO_SIZE (0x14)
-#define PDEV_BUS_IRQ (0x18)
-#define PDEV_BUS_IRQ_COUNT (0x1c)
-#define PDEV_BUS_GET_NAME_HIGH (0x20)
-
-struct pdev_bus_dev {
- struct list_head list;
- struct platform_device pdev;
- struct resource resources[0];
-};
-
-static void goldfish_pdev_worker(struct work_struct *work);
-
-static void __iomem *pdev_bus_base;
-static unsigned long pdev_bus_addr;
-static unsigned long pdev_bus_len;
-static u32 pdev_bus_irq;
-static LIST_HEAD(pdev_bus_new_devices);
-static LIST_HEAD(pdev_bus_registered_devices);
-static LIST_HEAD(pdev_bus_removed_devices);
-static DECLARE_WORK(pdev_bus_worker, goldfish_pdev_worker);
-
-
-static void goldfish_pdev_worker(struct work_struct *work)
-{
- int ret;
- struct pdev_bus_dev *pos, *n;
-
- list_for_each_entry_safe(pos, n, &pdev_bus_removed_devices, list) {
- list_del(&pos->list);
- platform_device_unregister(&pos->pdev);
- kfree(pos);
- }
- list_for_each_entry_safe(pos, n, &pdev_bus_new_devices, list) {
- list_del(&pos->list);
- ret = platform_device_register(&pos->pdev);
- if (ret)
- pr_err("goldfish_pdev_worker failed to register device, %s\n",
- pos->pdev.name);
- list_add_tail(&pos->list, &pdev_bus_registered_devices);
- }
-}
-
-static void goldfish_pdev_remove(void)
-{
- struct pdev_bus_dev *pos, *n;
- u32 base;
-
- base = readl(pdev_bus_base + PDEV_BUS_IO_BASE);
-
- list_for_each_entry_safe(pos, n, &pdev_bus_new_devices, list) {
- if (pos->resources[0].start == base) {
- list_del(&pos->list);
- kfree(pos);
- return;
- }
- }
- list_for_each_entry_safe(pos, n, &pdev_bus_registered_devices, list) {
- if (pos->resources[0].start == base) {
- list_del(&pos->list);
- list_add_tail(&pos->list, &pdev_bus_removed_devices);
- schedule_work(&pdev_bus_worker);
- return;
- }
- };
- pr_err("goldfish_pdev_remove could not find device at %x\n", base);
-}
-
-static int goldfish_new_pdev(void)
-{
- struct pdev_bus_dev *dev;
- u32 name_len;
- u32 irq = -1, irq_count;
- int resource_count = 2;
- u32 base;
- char *name;
-
- base = readl(pdev_bus_base + PDEV_BUS_IO_BASE);
-
- irq_count = readl(pdev_bus_base + PDEV_BUS_IRQ_COUNT);
- name_len = readl(pdev_bus_base + PDEV_BUS_NAME_LEN);
- if (irq_count)
- resource_count++;
-
- dev = kzalloc(sizeof(*dev) +
- sizeof(struct resource) * resource_count +
- name_len + 1 + sizeof(*dev->pdev.dev.dma_mask), GFP_ATOMIC);
- if (dev == NULL)
- return -ENOMEM;
-
- dev->pdev.num_resources = resource_count;
- dev->pdev.resource = (struct resource *)(dev + 1);
- dev->pdev.name = name = (char *)(dev->pdev.resource + resource_count);
- dev->pdev.dev.coherent_dma_mask = ~0;
- dev->pdev.dev.dma_mask = (void *)(dev->pdev.name + name_len + 1);
- *dev->pdev.dev.dma_mask = ~0;
-
-#ifdef CONFIG_64BIT
- writel((u32)((u64)name>>32), pdev_bus_base + PDEV_BUS_GET_NAME_HIGH);
-#endif
- writel((u32)(unsigned long)name, pdev_bus_base + PDEV_BUS_GET_NAME);
- name[name_len] = '\0';
- dev->pdev.id = readl(pdev_bus_base + PDEV_BUS_ID);
- dev->pdev.resource[0].start = base;
- dev->pdev.resource[0].end = base +
- readl(pdev_bus_base + PDEV_BUS_IO_SIZE) - 1;
- dev->pdev.resource[0].flags = IORESOURCE_MEM;
- if (irq_count) {
- irq = readl(pdev_bus_base + PDEV_BUS_IRQ);
- dev->pdev.resource[1].start = irq;
- dev->pdev.resource[1].end = irq + irq_count - 1;
- dev->pdev.resource[1].flags = IORESOURCE_IRQ;
- }
-
- pr_debug("goldfish_new_pdev %s at %x irq %d\n", name, base, irq);
- list_add_tail(&dev->list, &pdev_bus_new_devices);
- schedule_work(&pdev_bus_worker);
-
- return 0;
-}
-
-static irqreturn_t goldfish_pdev_bus_interrupt(int irq, void *dev_id)
-{
- irqreturn_t ret = IRQ_NONE;
-
- while (1) {
- u32 op = readl(pdev_bus_base + PDEV_BUS_OP);
-
- switch (op) {
- case PDEV_BUS_OP_REMOVE_DEV:
- goldfish_pdev_remove();
- ret = IRQ_HANDLED;
- break;
-
- case PDEV_BUS_OP_ADD_DEV:
- goldfish_new_pdev();
- ret = IRQ_HANDLED;
- break;
-
- case PDEV_BUS_OP_DONE:
- default:
- return ret;
- }
- }
-}
-
-static int goldfish_pdev_bus_probe(struct platform_device *pdev)
-{
- int ret;
- struct resource *r;
-
- r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (r == NULL)
- return -EINVAL;
-
- pdev_bus_addr = r->start;
- pdev_bus_len = resource_size(r);
-
- pdev_bus_base = ioremap(pdev_bus_addr, pdev_bus_len);
- if (pdev_bus_base == NULL) {
- ret = -ENOMEM;
- dev_err(&pdev->dev, "unable to map Goldfish MMIO.\n");
- goto free_resources;
- }
-
- r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (r == NULL) {
- ret = -ENOENT;
- goto free_map;
- }
-
- pdev_bus_irq = r->start;
-
- ret = request_irq(pdev_bus_irq, goldfish_pdev_bus_interrupt,
- IRQF_SHARED, "goldfish_pdev_bus", pdev);
- if (ret) {
- dev_err(&pdev->dev, "unable to request Goldfish IRQ\n");
- goto free_map;
- }
-
- writel(PDEV_BUS_OP_INIT, pdev_bus_base + PDEV_BUS_OP);
- return 0;
-
-free_map:
- iounmap(pdev_bus_base);
-free_resources:
- release_mem_region(pdev_bus_addr, pdev_bus_len);
- return ret;
-}
-
-static struct platform_driver goldfish_pdev_bus_driver = {
- .probe = goldfish_pdev_bus_probe,
- .driver = {
- .name = "goldfish_pdev_bus"
- }
-};
-builtin_platform_driver(goldfish_pdev_bus_driver);
projects / platform / kernel / linux-rpi.git / commitdiff