![Paul Gortmaker](/assets/img/avatar_default.png)
This driver is configured with a Kconfig option that is declared as a bool. Hence it is not possible for the code to be built as modular. However the code is currently using the module_platform_driver() macro for driver registration. While this currently works, we really don't want to be including the module.h header in non-modular code, which we'll be forced to do, pending some upcoming code relocation from init.h into module.h. So we fix it now by using the non-modular equivalent. And since we've already established that the code is non-modular, we can completely drop any code relating to module_exit. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
230 lines
6 KiB
C
230 lines
6 KiB
C
/*
|
|
* 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_DONE:
|
|
return IRQ_NONE;
|
|
|
|
case PDEV_BUS_OP_REMOVE_DEV:
|
|
goldfish_pdev_remove();
|
|
break;
|
|
|
|
case PDEV_BUS_OP_ADD_DEV:
|
|
goldfish_new_pdev();
|
|
break;
|
|
}
|
|
ret = IRQ_HANDLED;
|
|
}
|
|
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);
|