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libertas: document register meanings

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Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Holger Schurig 2008-06-05 13:07:04 +02:00 committed by John W. Linville
parent 3073556171
commit 5314325692
1 changed files with 80 additions and 9 deletions
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89
drivers/net/wireless/libertas/if_cs.c
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@ -159,7 +159,9 @@ static int if_cs_poll_while_fw_download(struct if_cs_card *card, uint addr, u8 r
/* First the bitmasks for the host/card interrupt/status registers: */
/*
* First the bitmasks for the host/card interrupt/status registers:
*/
#define IF_CS_BIT_TX 0x0001
#define IF_CS_BIT_RX 0x0002
#define IF_CS_BIT_COMMAND 0x0004
@ -167,35 +169,104 @@ static int if_cs_poll_while_fw_download(struct if_cs_card *card, uint addr, u8 r
#define IF_CS_BIT_EVENT 0x0010
#define IF_CS_BIT_MASK 0x001f
/* And now the individual registers and assorted masks */
/*
* It's not really clear to me what the host status register is for. It
* needs to be set almost in union with "host int cause". The following
* bits from above are used:
*
* IF_CS_BIT_TX driver downloaded a data packet
* IF_CS_BIT_RX driver got a data packet
* IF_CS_BIT_COMMAND driver downloaded a command
* IF_CS_BIT_RESP not used (has some meaning with powerdown)
* IF_CS_BIT_EVENT driver read a host event
*/
#define IF_CS_HOST_STATUS 0x00000000
/*
* With the host int cause register can the host (that is, Linux) cause
* an interrupt in the firmware, to tell the firmware about those events:
*
* IF_CS_BIT_TX a data packet has been downloaded
* IF_CS_BIT_RX a received data packet has retrieved
* IF_CS_BIT_COMMAND a firmware block or a command has been downloaded
* IF_CS_BIT_RESP not used (has some meaning with powerdown)
* IF_CS_BIT_EVENT a host event (link lost etc) has been retrieved
*/
#define IF_CS_HOST_INT_CAUSE 0x00000002
/*
* The host int mask register is used to enable/disable interrupt. However,
* I have the suspicion that disabled interrupts are lost.
*/
#define IF_CS_HOST_INT_MASK 0x00000004
/*
* Used to send or receive data packets:
*/
#define IF_CS_HOST_WRITE 0x00000016
#define IF_CS_HOST_WRITE_LEN 0x00000014
#define IF_CS_HOST_CMD 0x0000001A
#define IF_CS_HOST_CMD_LEN 0x00000018
#define IF_CS_READ 0x00000010
#define IF_CS_READ_LEN 0x00000024
/*
* Used to send commands (and to send firmware block) and to
* receive command responses:
*/
#define IF_CS_HOST_CMD 0x0000001A
#define IF_CS_HOST_CMD_LEN 0x00000018
#define IF_CS_CARD_CMD 0x00000012
#define IF_CS_CARD_CMD_LEN 0x00000030
/*
* The card status registers shows what the card/firmware actually
* accepts:
*
* IF_CS_BIT_TX you may send a data packet
* IF_CS_BIT_RX you may retrieve a data packet
* IF_CS_BIT_COMMAND you may send a command
* IF_CS_BIT_RESP you may retrieve a command response
* IF_CS_BIT_EVENT the card has a event for use (link lost, snr low etc)
*
* When reading this register several times, you will get back the same
* results --- with one exception: the IF_CS_BIT_EVENT clear itself
* automatically.
*
* Not that we don't rely on BIT_RX,_BIT_RESP or BIT_EVENT because
* we handle this via the card int cause register.
*/
#define IF_CS_CARD_STATUS 0x00000020
#define IF_CS_CARD_STATUS_MASK 0x7f00
/*
* The card int cause register is used by the card/firmware to notify us
* about the following events:
*
* IF_CS_BIT_TX a data packet has successfully been sentx
* IF_CS_BIT_RX a data packet has been received and can be retrieved
* IF_CS_BIT_COMMAND not used
* IF_CS_BIT_RESP the firmware has a command response for us
* IF_CS_BIT_EVENT the card has a event for use (link lost, snr low etc)
*/
#define IF_CS_CARD_INT_CAUSE 0x00000022
/*
* This is used to for handshaking with the card's bootloader/helper image
* to synchronize downloading of firmware blocks.
*/
#define IF_CS_CARD_SQ_READ_LOW 0x00000028
#define IF_CS_CARD_SQ_HELPER_OK 0x10
/*
* The scratch register tells us ...
*
* IF_CS_SCRATCH_BOOT_OK the bootloader runs
* IF_CS_SCRATCH_HELPER_OK the helper firmware already runs
*/
#define IF_CS_SCRATCH 0x0000003F
#define IF_CS_SCRATCH_BOOT_OK 0x00
#define IF_CS_SCRATCH_HELPER_OK 0x5a
/********************************************************************/
@ -465,11 +536,11 @@ static int if_cs_prog_helper(struct if_cs_card *card)
/* "If the value is 0x5a, the firmware is already
* downloaded successfully"
*/
if (scratch == 0x5a)
if (scratch == IF_CS_SCRATCH_HELPER_OK)
goto done;
/* "If the value is != 00, it is invalid value of register */
if (scratch != 0x00) {
if (scratch != IF_CS_SCRATCH_BOOT_OK) {
ret = -ENODEV;
goto done;
}