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/*
* 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;
}
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