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author | Paul Mundt <lethal@linux-sh.org> | 2011-03-17 07:44:08 (GMT) |
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committer | Paul Mundt <lethal@linux-sh.org> | 2011-03-17 07:44:08 (GMT) |
commit | 1d2a1959fe534279cf37aba20b08c24c20840e52 (patch) | |
tree | 67c0b9aa7fe22a44bf0b4af88947799203eb8f67 /drivers/usb/otg/ulpi_viewport.c | |
parent | 5a79ce76e9bb8f4b2cd8106ee36d15ee05013bcf (diff) | |
parent | 054cfaacf88865bff1dd58d305443d5d6c068a08 (diff) | |
download | linux-1d2a1959fe534279cf37aba20b08c24c20840e52.tar.xz |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into sh-latest
Diffstat (limited to 'drivers/usb/otg/ulpi_viewport.c')
-rw-r--r-- | drivers/usb/otg/ulpi_viewport.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/usb/otg/ulpi_viewport.c b/drivers/usb/otg/ulpi_viewport.c new file mode 100644 index 0000000..e9a37f9 --- /dev/null +++ b/drivers/usb/otg/ulpi_viewport.c @@ -0,0 +1,80 @@ +/* + * Copyright (C) 2011 Google, 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/usb.h> +#include <linux/io.h> +#include <linux/usb/otg.h> +#include <linux/usb/ulpi.h> + +#define ULPI_VIEW_WAKEUP (1 << 31) +#define ULPI_VIEW_RUN (1 << 30) +#define ULPI_VIEW_WRITE (1 << 29) +#define ULPI_VIEW_READ (0 << 29) +#define ULPI_VIEW_ADDR(x) (((x) & 0xff) << 16) +#define ULPI_VIEW_DATA_READ(x) (((x) >> 8) & 0xff) +#define ULPI_VIEW_DATA_WRITE(x) ((x) & 0xff) + +static int ulpi_viewport_wait(void __iomem *view, u32 mask) +{ + unsigned long usec = 2000; + + while (usec--) { + if (!(readl(view) & mask)) + return 0; + + udelay(1); + }; + + return -ETIMEDOUT; +} + +static int ulpi_viewport_read(struct otg_transceiver *otg, u32 reg) +{ + int ret; + void __iomem *view = otg->io_priv; + + writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); + ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); + if (ret) + return ret; + + writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view); + ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN); + if (ret) + return ret; + + return ULPI_VIEW_DATA_READ(readl(view)); +} + +static int ulpi_viewport_write(struct otg_transceiver *otg, u32 val, u32 reg) +{ + int ret; + void __iomem *view = otg->io_priv; + + writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view); + ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP); + if (ret) + return ret; + + writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) | + ULPI_VIEW_ADDR(reg), view); + + return ulpi_viewport_wait(view, ULPI_VIEW_RUN); +} + +struct otg_io_access_ops ulpi_viewport_access_ops = { + .read = ulpi_viewport_read, + .write = ulpi_viewport_write, +}; |