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libertas: get SD8688 rx length with one CMD52 

Usually, the 16-bit rx length is read from scratch pad registers
with two CMD52 transactions:
SD8385: 	IF_SDIO_SCRATCH_OLD (0x80fe/0x80ff)
SD8686/SD8688:	IF_SDIO_SCRATCH     (0x34/0x35)

Alternatively, SD8688 firmware offers an enhanced method for driver
to read an 8-bit rx length (in units) with a single CMD52:
IF_SDIO_RX_UNIT 0x43 is read one time after firmware is ready.
IF_SDIO_RX_LEN  0x42 is read every time when rx interrupt is received.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bing Zhao 2009-05-19 19:48:19 -07:00 committed by John W. Linville
parent e70a5ac5d2
commit b136a1414c
2 changed files with 58 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
drivers/net/wireless/libertas/if_sdio.c
View File

@ -107,6 +107,8 @@ struct if_sdio_card {
struct workqueue_struct *workqueue;
struct work_struct packet_worker;
u8 rx_unit;
};
/********************************************************************/
@ -136,6 +138,46 @@ static u16 if_sdio_read_scratch(struct if_sdio_card *card, int *err)
return scratch;
}
static u8 if_sdio_read_rx_unit(struct if_sdio_card *card)
{
int ret;
u8 rx_unit;
rx_unit = sdio_readb(card->func, IF_SDIO_RX_UNIT, &ret);
if (ret)
rx_unit = 0;
return rx_unit;
}
static u16 if_sdio_read_rx_len(struct if_sdio_card *card, int *err)
{
int ret;
u16 rx_len;
switch (card->model) {
case IF_SDIO_MODEL_8385:
case IF_SDIO_MODEL_8686:
rx_len = if_sdio_read_scratch(card, &ret);
break;
case IF_SDIO_MODEL_8688:
default: /* for newer chipsets */
rx_len = sdio_readb(card->func, IF_SDIO_RX_LEN, &ret);
if (!ret)
rx_len <<= card->rx_unit;
else
rx_len = 0xffff; /* invalid length */
break;
}
if (err)
*err = ret;
return rx_len;
}
static int if_sdio_handle_cmd(struct if_sdio_card *card,
u8 *buffer, unsigned size)
{
@ -254,7 +296,7 @@ static int if_sdio_card_to_host(struct if_sdio_card *card)
lbs_deb_enter(LBS_DEB_SDIO);
size = if_sdio_read_scratch(card, &ret);
size = if_sdio_read_rx_len(card, &ret);
if (ret)
goto out;
@ -923,10 +965,21 @@ static int if_sdio_probe(struct sdio_func *func,
priv->fw_ready = 1;
sdio_claim_host(func);
/*
* Get rx_unit if the chip is SD8688 or newer.
* SD8385 & SD8686 do not have rx_unit.
*/
if ((card->model != IF_SDIO_MODEL_8385)
&& (card->model != IF_SDIO_MODEL_8686))
card->rx_unit = if_sdio_read_rx_unit(card);
else
card->rx_unit = 0;
/*
* Enable interrupts now that everything is set up
*/
sdio_claim_host(func);
sdio_writeb(func, 0x0f, IF_SDIO_H_INT_MASK, &ret);
sdio_release_host(func);
if (ret)

3
drivers/net/wireless/libertas/if_sdio.h
View File

@ -44,6 +44,9 @@
#define IF_SDIO_SCRATCH_OLD 0x80fe
#define IF_SDIO_FIRMWARE_OK 0xfedc
#define IF_SDIO_RX_LEN 0x42
#define IF_SDIO_RX_UNIT 0x43
#define IF_SDIO_EVENT 0x80fc
#define IF_SDIO_BLOCK_SIZE 256