static int goldfish_tty_probe(struct platform_device *pdev)
{
int ret;
int i;
struct resource *r;
struct device *ttydev;
uint32_t base;
uint32_t irq;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if(r == NULL)
return -EINVAL;
base = IO_ADDRESS(r->start - IO_START);
r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if(r == NULL)
return -EINVAL;
irq = r->start;
if(pdev->id >= goldfish_tty_line_count)
return -EINVAL;
mutex_lock(&goldfish_tty_lock);
if(goldfish_tty_current_line_count == 0) {
ret = goldfish_tty_create_driver();
if(ret)
goto err_create_driver_failed;
}
goldfish_tty_current_line_count++;
spin_lock_init(&goldfish_ttys[pdev->id].lock);
goldfish_ttys[pdev->id].base = base;
goldfish_ttys[pdev->id].irq = irq;
writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);
ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED, "goldfish_tty", pdev);
if(ret)
goto err_request_irq_failed;
ttydev = tty_register_device(goldfish_tty_driver, pdev->id, NULL);
if(IS_ERR(ttydev)) {
ret = PTR_ERR(ttydev);
goto err_tty_register_device_failed;
}
strcpy(goldfish_ttys[pdev->id].console.name, "ttyS");
goldfish_ttys[pdev->id].console.write = goldfish_tty_console_write;
goldfish_ttys[pdev->id].console.device = goldfish_tty_console_device;
goldfish_ttys[pdev->id].console.setup = goldfish_tty_console_setup;
goldfish_ttys[pdev->id].console.flags = CON_PRINTBUFFER;
goldfish_ttys[pdev->id].console.index = pdev->id;
register_console(&goldfish_ttys[pdev->id].console);
mutex_unlock(&goldfish_tty_lock);
return 0;
tty_unregister_device(goldfish_tty_driver, i);
err_tty_register_device_failed:
free_irq(irq, pdev);
err_request_irq_failed:
goldfish_tty_current_line_count--;
if(goldfish_tty_current_line_count == 0) {
goldfish_tty_delete_driver();
}
err_create_driver_failed:
mutex_unlock(&goldfish_tty_lock);
return ret;
}
static int goldfish_tty_probe(struct platform_device *pdev)
{
struct goldfish_tty *qtty;
int ret = -ENODEV;
struct resource *r;
struct device *ttydev;
void __iomem *base;
u32 irq;
unsigned int line;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
pr_err("goldfish_tty: No MEM resource available!\n");
return -ENOMEM;
}
base = ioremap(r->start, 0x1000);
if (!base) {
pr_err("goldfish_tty: Unable to ioremap base!\n");
return -ENOMEM;
}
r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!r) {
pr_err("goldfish_tty: No IRQ resource available!\n");
goto err_unmap;
}
irq = r->start;
mutex_lock(&goldfish_tty_lock);
if (pdev->id == PLATFORM_DEVID_NONE)
line = goldfish_tty_current_line_count;
else
line = pdev->id;
if (line >= goldfish_tty_line_count) {
pr_err("goldfish_tty: Reached maximum tty number of %d.\n",
goldfish_tty_current_line_count);
ret = -ENOMEM;
goto err_unlock;
}
if (goldfish_tty_current_line_count == 0) {
ret = goldfish_tty_create_driver();
if (ret)
goto err_unlock;
}
goldfish_tty_current_line_count++;
qtty = &goldfish_ttys[line];
spin_lock_init(&qtty->lock);
tty_port_init(&qtty->port);
qtty->port.ops = &goldfish_port_ops;
qtty->base = base;
qtty->irq = irq;
qtty->dev = &pdev->dev;
/*
* Goldfish TTY device used by the Goldfish emulator
* should identify itself with 0, forcing the driver
* to use virtual addresses. Goldfish TTY device
* on Ranchu emulator (qemu2) returns 1 here and
* driver will use physical addresses.
*/
qtty->version = readl(base + GOLDFISH_TTY_REG_VERSION);
/*
* Goldfish TTY device on Ranchu emulator (qemu2)
* will use DMA for read/write IO operations.
*/
if (qtty->version > 0) {
/*
* Initialize dma_mask to 32-bits.
*/
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
if (ret) {
dev_err(&pdev->dev, "No suitable DMA available.\n");
goto err_dec_line_count;
}
}
writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_REG_CMD);
ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED,
"goldfish_tty", qtty);
if (ret) {
pr_err("goldfish_tty: No IRQ available!\n");
goto err_dec_line_count;
}
ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
line, &pdev->dev);
if (IS_ERR(ttydev)) {
ret = PTR_ERR(ttydev);
goto err_tty_register_device_failed;
}
strcpy(qtty->console.name, "ttyGF");
qtty->console.write = goldfish_tty_console_write;
qtty->console.device = goldfish_tty_console_device;
qtty->console.setup = goldfish_tty_console_setup;
qtty->console.flags = CON_PRINTBUFFER;
qtty->console.index = line;
register_console(&qtty->console);
platform_set_drvdata(pdev, qtty);
mutex_unlock(&goldfish_tty_lock);
return 0;
err_tty_register_device_failed:
free_irq(irq, qtty);
err_dec_line_count:
goldfish_tty_current_line_count--;
if (goldfish_tty_current_line_count == 0)
goldfish_tty_delete_driver();
err_unlock:
mutex_unlock(&goldfish_tty_lock);
err_unmap:
iounmap(base);
return ret;
}
