1 files changed, 211 insertions, 0 deletions

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
new file mode 100644
index 000000000000..3fd3adf90541
--- /dev/null
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -0,0 +1,211 @@
+/*
+ * Renesas USB driver
+ *
+ * Copyright (C) 2011 Renesas Solutions Corp.
+ * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+#include <linux/delay.h>
+#include <linux/io.h>
+#include "./common.h"
+#include "./pipe.h"
+
+/*
+ *              FIFO ctrl
+ */
+static void usbhsf_send_terminator(struct usbhs_pipe *pipe)
+{
+        struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
+
+        usbhs_bset(priv, CFIFOCTR, BVAL, BVAL);
+}
+
+static int usbhsf_fifo_barrier(struct usbhs_priv *priv)
+{
+        int timeout = 1024;
+
+        do {
+                /* The FIFO port is accessible */
+                if (usbhs_read(priv, CFIFOCTR) & FRDY)
+                        return 0;
+
+                udelay(10);
+        } while (timeout--);
+
+        return -EBUSY;
+}
+
+static void usbhsf_fifo_clear(struct usbhs_pipe *pipe)
+{
+        struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
+
+        if (!usbhs_pipe_is_dcp(pipe))
+                usbhsf_fifo_barrier(priv);
+
+        usbhs_write(priv, CFIFOCTR, BCLR);
+}
+
+static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv)
+{
+        return usbhs_read(priv, CFIFOCTR) & DTLN_MASK;
+}
+
+static int usbhsf_fifo_select(struct usbhs_pipe *pipe, int write)
+{
+        struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
+        struct device *dev = usbhs_priv_to_dev(priv);
+        int timeout = 1024;
+        u16 mask = ((1 << 5) | 0xF);            /* mask of ISEL | CURPIPE */
+        u16 base = usbhs_pipe_number(pipe);     /* CURPIPE */
+
+        if (usbhs_pipe_is_dcp(pipe))
+                base |= (1 == write) << 5;      /* ISEL */
+
+        /* "base" will be used below  */
+        usbhs_write(priv, CFIFOSEL, base | MBW_32);
+
+        /* check ISEL and CURPIPE value */
+        while (timeout--) {
+                if (base == (mask & usbhs_read(priv, CFIFOSEL)))
+                        return 0;
+                udelay(10);
+        }
+
+        dev_err(dev, "fifo select error\n");
+
+        return -EIO;
+}
+
+/*
+ *              PIO fifo functions
+ */
+int usbhs_fifo_prepare_write(struct usbhs_pipe *pipe)
+{
+        return usbhsf_fifo_select(pipe, 1);
+}
+
+int usbhs_fifo_write(struct usbhs_pipe *pipe, u8 *buf, int len)
+{
+        struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
+        void __iomem *addr = priv->base + CFIFO;
+        int maxp = usbhs_pipe_get_maxpacket(pipe);
+        int total_len;
+        int i, ret;
+
+        ret = usbhs_pipe_is_accessible(pipe);
+        if (ret < 0)
+                return ret;
+
+        ret = usbhsf_fifo_select(pipe, 1);
+        if (ret < 0)
+                return ret;
+
+        ret = usbhsf_fifo_barrier(priv);
+        if (ret < 0)
+                return ret;
+
+        len = min(len, maxp);
+        total_len = len;
+
+        /*
+         * FIXME
+         *
+         * 32-bit access only
+         */
+        if (len >= 4 &&
+            !((unsigned long)buf & 0x03)) {
+                iowrite32_rep(addr, buf, len / 4);
+                len %= 4;
+                buf += total_len - len;
+        }
+
+        /* the rest operation */
+        for (i = 0; i < len; i++)
+                iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
+
+        if (total_len < maxp)
+                usbhsf_send_terminator(pipe);
+
+        return total_len;
+}
+
+int usbhs_fifo_prepare_read(struct usbhs_pipe *pipe)
+{
+        int ret;
+
+        /*
+         * select pipe and enable it to prepare packet receive
+         */
+        ret = usbhsf_fifo_select(pipe, 0);
+        if (ret < 0)
+                return ret;
+
+        usbhs_pipe_enable(pipe);
+
+        return ret;
+}
+
+int usbhs_fifo_read(struct usbhs_pipe *pipe, u8 *buf, int len)
+{
+        struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
+        void __iomem *addr = priv->base + CFIFO;
+        int rcv_len;
+        int i, ret;
+        int total_len;
+        u32 data = 0;
+
+        ret = usbhsf_fifo_select(pipe, 0);
+        if (ret < 0)
+                return ret;
+
+        ret = usbhsf_fifo_barrier(priv);
+        if (ret < 0)
+                return ret;
+
+        rcv_len = usbhsf_fifo_rcv_len(priv);
+
+        /*
+         * Buffer clear if Zero-Length packet
+         *
+         * see
+         * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
+         */
+        if (0 == rcv_len) {
+                usbhsf_fifo_clear(pipe);
+                return 0;
+        }
+
+        len = min(rcv_len, len);
+        total_len = len;
+
+        /*
+         * FIXME
+         *
+         * 32-bit access only
+         */
+        if (len >= 4 &&
+            !((unsigned long)buf & 0x03)) {
+                ioread32_rep(addr, buf, len / 4);
+                len %= 4;
+                buf += rcv_len - len;
+        }
+
+        /* the rest operation */
+        for (i = 0; i < len; i++) {
+                if (!(i & 0x03))
+                        data = ioread32(addr);
+
+                buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
+        }
+
+        return total_len;
+}