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platform: goldfish: Retire pdev_bus
Not used by goldfish. Signed-off-by: Roman Kiryanov <rkir@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roman Kiryanov
Greg Kroah-Hartman
parent
68275680ea
commit
9a481bdc16
@ -10,11 +10,6 @@ menuconfig GOLDFISH
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if GOLDFISH
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config GOLDFISH_BUS
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bool "Goldfish platform bus"
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---help---
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This is a virtual bus to host Goldfish Android Virtual Devices.
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config GOLDFISH_PIPE
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tristate "Goldfish virtual device for QEMU pipes"
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---help---
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@ -1,5 +1,4 @@
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#
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# Makefile for Goldfish platform specific drivers
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#
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obj-$(CONFIG_GOLDFISH_BUS) += pdev_bus.o
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obj-$(CONFIG_GOLDFISH_PIPE) += goldfish_pipe.o
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@ -1,232 +0,0 @@
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/*
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* Copyright (C) 2007 Google, Inc.
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* Copyright (C) 2011 Intel, Inc.
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* Copyright (C) 2013 Intel, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#define PDEV_BUS_OP_DONE (0x00)
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#define PDEV_BUS_OP_REMOVE_DEV (0x04)
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#define PDEV_BUS_OP_ADD_DEV (0x08)
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#define PDEV_BUS_OP_INIT (0x00)
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#define PDEV_BUS_OP (0x00)
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#define PDEV_BUS_GET_NAME (0x04)
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#define PDEV_BUS_NAME_LEN (0x08)
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#define PDEV_BUS_ID (0x0c)
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#define PDEV_BUS_IO_BASE (0x10)
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#define PDEV_BUS_IO_SIZE (0x14)
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#define PDEV_BUS_IRQ (0x18)
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#define PDEV_BUS_IRQ_COUNT (0x1c)
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#define PDEV_BUS_GET_NAME_HIGH (0x20)
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struct pdev_bus_dev {
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struct list_head list;
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struct platform_device pdev;
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struct resource resources[0];
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};
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static void goldfish_pdev_worker(struct work_struct *work);
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static void __iomem *pdev_bus_base;
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static unsigned long pdev_bus_addr;
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static unsigned long pdev_bus_len;
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static u32 pdev_bus_irq;
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static LIST_HEAD(pdev_bus_new_devices);
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static LIST_HEAD(pdev_bus_registered_devices);
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static LIST_HEAD(pdev_bus_removed_devices);
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static DECLARE_WORK(pdev_bus_worker, goldfish_pdev_worker);
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static void goldfish_pdev_worker(struct work_struct *work)
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{
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int ret;
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struct pdev_bus_dev *pos, *n;
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list_for_each_entry_safe(pos, n, &pdev_bus_removed_devices, list) {
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list_del(&pos->list);
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platform_device_unregister(&pos->pdev);
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kfree(pos);
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}
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list_for_each_entry_safe(pos, n, &pdev_bus_new_devices, list) {
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list_del(&pos->list);
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ret = platform_device_register(&pos->pdev);
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if (ret)
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pr_err("goldfish_pdev_worker failed to register device, %s\n",
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pos->pdev.name);
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list_add_tail(&pos->list, &pdev_bus_registered_devices);
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}
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}
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static void goldfish_pdev_remove(void)
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{
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struct pdev_bus_dev *pos, *n;
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u32 base;
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base = readl(pdev_bus_base + PDEV_BUS_IO_BASE);
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list_for_each_entry_safe(pos, n, &pdev_bus_new_devices, list) {
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if (pos->resources[0].start == base) {
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list_del(&pos->list);
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kfree(pos);
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return;
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}
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}
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list_for_each_entry_safe(pos, n, &pdev_bus_registered_devices, list) {
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if (pos->resources[0].start == base) {
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list_del(&pos->list);
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list_add_tail(&pos->list, &pdev_bus_removed_devices);
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schedule_work(&pdev_bus_worker);
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return;
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}
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};
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pr_err("goldfish_pdev_remove could not find device at %x\n", base);
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}
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static int goldfish_new_pdev(void)
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{
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struct pdev_bus_dev *dev;
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u32 name_len;
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u32 irq = -1, irq_count;
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int resource_count = 2;
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u32 base;
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char *name;
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base = readl(pdev_bus_base + PDEV_BUS_IO_BASE);
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irq_count = readl(pdev_bus_base + PDEV_BUS_IRQ_COUNT);
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name_len = readl(pdev_bus_base + PDEV_BUS_NAME_LEN);
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if (irq_count)
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resource_count++;
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dev = kzalloc(sizeof(*dev) +
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sizeof(struct resource) * resource_count +
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name_len + 1 + sizeof(*dev->pdev.dev.dma_mask), GFP_ATOMIC);
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if (dev == NULL)
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return -ENOMEM;
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dev->pdev.num_resources = resource_count;
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dev->pdev.resource = (struct resource *)(dev + 1);
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dev->pdev.name = name = (char *)(dev->pdev.resource + resource_count);
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dev->pdev.dev.coherent_dma_mask = ~0;
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dev->pdev.dev.dma_mask = (void *)(dev->pdev.name + name_len + 1);
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*dev->pdev.dev.dma_mask = ~0;
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#ifdef CONFIG_64BIT
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writel((u32)((u64)name>>32), pdev_bus_base + PDEV_BUS_GET_NAME_HIGH);
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#endif
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writel((u32)(unsigned long)name, pdev_bus_base + PDEV_BUS_GET_NAME);
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name[name_len] = '\0';
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dev->pdev.id = readl(pdev_bus_base + PDEV_BUS_ID);
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dev->pdev.resource[0].start = base;
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dev->pdev.resource[0].end = base +
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readl(pdev_bus_base + PDEV_BUS_IO_SIZE) - 1;
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dev->pdev.resource[0].flags = IORESOURCE_MEM;
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if (irq_count) {
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irq = readl(pdev_bus_base + PDEV_BUS_IRQ);
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dev->pdev.resource[1].start = irq;
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dev->pdev.resource[1].end = irq + irq_count - 1;
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dev->pdev.resource[1].flags = IORESOURCE_IRQ;
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}
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pr_debug("goldfish_new_pdev %s at %x irq %d\n", name, base, irq);
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list_add_tail(&dev->list, &pdev_bus_new_devices);
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schedule_work(&pdev_bus_worker);
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return 0;
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}
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static irqreturn_t goldfish_pdev_bus_interrupt(int irq, void *dev_id)
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{
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irqreturn_t ret = IRQ_NONE;
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while (1) {
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u32 op = readl(pdev_bus_base + PDEV_BUS_OP);
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switch (op) {
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case PDEV_BUS_OP_REMOVE_DEV:
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goldfish_pdev_remove();
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ret = IRQ_HANDLED;
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break;
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case PDEV_BUS_OP_ADD_DEV:
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goldfish_new_pdev();
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ret = IRQ_HANDLED;
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break;
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case PDEV_BUS_OP_DONE:
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default:
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return ret;
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}
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}
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}
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static int goldfish_pdev_bus_probe(struct platform_device *pdev)
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{
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int ret;
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struct resource *r;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (r == NULL)
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return -EINVAL;
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pdev_bus_addr = r->start;
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pdev_bus_len = resource_size(r);
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pdev_bus_base = ioremap(pdev_bus_addr, pdev_bus_len);
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if (pdev_bus_base == NULL) {
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ret = -ENOMEM;
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dev_err(&pdev->dev, "unable to map Goldfish MMIO.\n");
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goto free_resources;
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}
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r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (r == NULL) {
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ret = -ENOENT;
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goto free_map;
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}
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pdev_bus_irq = r->start;
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ret = request_irq(pdev_bus_irq, goldfish_pdev_bus_interrupt,
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IRQF_SHARED, "goldfish_pdev_bus", pdev);
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if (ret) {
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dev_err(&pdev->dev, "unable to request Goldfish IRQ\n");
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goto free_map;
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}
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writel(PDEV_BUS_OP_INIT, pdev_bus_base + PDEV_BUS_OP);
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return 0;
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free_map:
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iounmap(pdev_bus_base);
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free_resources:
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release_mem_region(pdev_bus_addr, pdev_bus_len);
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return ret;
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}
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static struct platform_driver goldfish_pdev_bus_driver = {
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.probe = goldfish_pdev_bus_probe,
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.driver = {
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.name = "goldfish_pdev_bus"
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}
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};
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builtin_platform_driver(goldfish_pdev_bus_driver);
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