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usb: m66592-udc buffer management update 

This patch updates the m66592-udc buffer management code.

Use fixed buffers for bulk and isochronous pipes, also make
sure to handle the isochronous-as-bulk case. With fixed buffers
there is no need to keep track of used buffers with bi_bufnum.

Also, this fixes a potential buffer offset problem where the
base offset incorrectly varies with the number of pipes used.

With this patch applied it is possible to use m66592-udc for
both Ethernet and Serial using CONFIG_USB_CDC_COMPOSITE.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2009-06-26 06:59:17 +00:00 committed by Paul Mundt
parent 5084f61a4d
commit 4048e5ca29
2 changed files with 12 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/usb/gadget/m66592-udc.c
View File

@ -37,7 +37,7 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yoshihiro Shimoda");
MODULE_ALIAS("platform:m66592_udc");
#define DRIVER_VERSION "18 Oct 2007"
#define DRIVER_VERSION "26 Jun 2009"
/* module parameters */
#if defined(CONFIG_SUPERH_BUILT_IN_M66592)
@ -276,24 +276,27 @@ static int pipe_buffer_setting(struct m66592 *m66592,
buf_bsize = 0;
break;
case M66592_BULK:
bufnum = m66592->bi_bufnum +
(info->pipe - M66592_BASE_PIPENUM_BULK) * 16;
m66592->bi_bufnum += 16;
/* isochronous pipes may be used as bulk pipes */
if (info->pipe > M66592_BASE_PIPENUM_BULK)
bufnum = info->pipe - M66592_BASE_PIPENUM_BULK;
else
bufnum = info->pipe - M66592_BASE_PIPENUM_ISOC;
bufnum = M66592_BASE_BUFNUM + (bufnum * 16);
buf_bsize = 7;
pipecfg |= M66592_DBLB;
if (!info->dir_in)
pipecfg |= M66592_SHTNAK;
break;
case M66592_ISO:
bufnum = m66592->bi_bufnum +
bufnum = M66592_BASE_BUFNUM +
(info->pipe - M66592_BASE_PIPENUM_ISOC) * 16;
m66592->bi_bufnum += 16;
buf_bsize = 7;
break;
}
if (m66592->bi_bufnum > M66592_MAX_BUFNUM) {
pr_err("m66592 pipe memory is insufficient(%d)\n",
m66592->bi_bufnum);
if (buf_bsize && ((bufnum + 16) >= M66592_MAX_BUFNUM)) {
pr_err("m66592 pipe memory is insufficient\n");
return -ENOMEM;
}
@ -313,17 +316,6 @@ static void pipe_buffer_release(struct m66592 *m66592,
if (info->pipe == 0)
return;
switch (info->type) {
case M66592_BULK:
if (is_bulk_pipe(info->pipe))
m66592->bi_bufnum -= 16;
break;
case M66592_ISO:
if (is_isoc_pipe(info->pipe))
m66592->bi_bufnum -= 16;
break;
}
if (is_bulk_pipe(info->pipe)) {
m66592->bulk--;
} else if (is_interrupt_pipe(info->pipe))
@ -1603,8 +1595,6 @@ static int __init m66592_probe(struct platform_device *pdev)
m66592->timer.data = (unsigned long)m66592;
m66592->reg = reg;
m66592->bi_bufnum = M66592_BASE_BUFNUM;
ret = request_irq(irq, m66592_irq, IRQF_DISABLED | IRQF_SHARED,
udc_name, m66592);
if (ret < 0) {

1
drivers/usb/gadget/m66592-udc.h
View File

@ -506,7 +506,6 @@ struct m66592 {
int interrupt;
int isochronous;
int num_dma;
int bi_bufnum; /* bulk and isochronous's bufnum */
};
#define gadget_to_m66592(_gadget) container_of(_gadget, struct m66592, gadget)