diff options
| -rw-r--r-- | drivers/platform/goldfish/goldfish_pipe.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c index 7a56be9c9432..c214434e8811 100644 --- a/drivers/platform/goldfish/goldfish_pipe.c +++ b/drivers/platform/goldfish/goldfish_pipe.c @@ -77,6 +77,7 @@ #define PIPE_REG_PARAMS_ADDR_LOW 0x18 /* read/write: batch data address */ #define PIPE_REG_PARAMS_ADDR_HIGH 0x1c /* read/write: batch data address */ #define PIPE_REG_ACCESS_PARAMS 0x20 /* write: batch access */ +#define PIPE_REG_VERSION 0x24 /* read: device version */ /* list of commands for PIPE_REG_COMMAND */ #define CMD_OPEN 1 /* open new channel */ @@ -126,6 +127,7 @@ struct goldfish_pipe_dev { unsigned char __iomem *base; struct access_params *aps; int irq; + u32 version; }; static struct goldfish_pipe_dev pipe_dev[1]; @@ -296,26 +298,43 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, char __user *buffer, int status, wakeBit; struct page *page; + /* Either vaddr or paddr depending on the device version */ + unsigned long xaddr; + /* * We grab the pages on a page-by-page basis in case user * space gives us a potentially huge buffer but the read only * returns a small amount, then there's no need to pin that * much memory to the process. */ + down_read(¤t->mm->mmap_sem); ret = get_user_pages(current, current->mm, address, 1, !is_write, 0, &page, NULL); + up_read(¤t->mm->mmap_sem); if (ret < 0) return ret; + if (dev->version) { + /* Device version 1 or newer (qemu-android) expects the + * physical address. + */ + xaddr = page_to_phys(page) | (address & ~PAGE_MASK); + } else { + /* Device version 0 (classic emulator) expects the + * virtual address. + */ + xaddr = address; + } + /* Now, try to transfer the bytes in the current page */ spin_lock_irqsave(&dev->lock, irq_flags); if (access_with_param(dev, is_write ? CMD_WRITE_BUFFER : CMD_READ_BUFFER, - address, avail, pipe, &status)) { + xaddr, avail, pipe, &status)) { gf_write_ptr(pipe, dev->base + PIPE_REG_CHANNEL, dev->base + PIPE_REG_CHANNEL_HIGH); writel(avail, dev->base + PIPE_REG_SIZE); - gf_write_ptr((void *)address, + gf_write_ptr((void *)xaddr, dev->base + PIPE_REG_ADDRESS, dev->base + PIPE_REG_ADDRESS_HIGH); writel(is_write ? CMD_WRITE_BUFFER : CMD_READ_BUFFER, @@ -610,6 +629,12 @@ static int goldfish_pipe_probe(struct platform_device *pdev) goto error; } setup_access_params_addr(pdev, dev); + + /* Although the pipe device in the classic Android emulator does not + * recognize the 'version' register, it won't treat this as an error + * either and will simply return 0, which is fine. + */ + dev->version = readl(dev->base + PIPE_REG_VERSION); return 0; error: |