diff options
Diffstat (limited to 'drivers/net/wireless/libertas/if_cs.c')
| -rw-r--r-- | drivers/net/wireless/libertas/if_cs.c | 162 |
1 files changed, 122 insertions, 40 deletions
diff --git a/drivers/net/wireless/libertas/if_cs.c b/drivers/net/wireless/libertas/if_cs.c index 873ab10a078..cc70d53fadd 100644 --- a/drivers/net/wireless/libertas/if_cs.c +++ b/drivers/net/wireless/libertas/if_cs.c @@ -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 +169,110 @@ 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 -#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 - +/* + * Used to send or receive data packets: + */ +#define IF_CS_WRITE 0x00000016 +#define IF_CS_WRITE_LEN 0x00000014 #define IF_CS_READ 0x00000010 #define IF_CS_READ_LEN 0x00000024 -#define IF_CS_CARD_CMD 0x00000012 -#define IF_CS_CARD_CMD_LEN 0x00000030 +/* + * Used to send commands (and to send firmware block) and to + * receive command responses: + */ +#define IF_CS_CMD 0x0000001A +#define IF_CS_CMD_LEN 0x00000018 +#define IF_CS_RESP 0x00000012 +#define IF_CS_RESP_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 -#define IF_CS_CARD_SQ_READ_LOW 0x00000028 -#define IF_CS_CARD_SQ_HELPER_OK 0x10 +/* + * This is used to for handshaking with the card's bootloader/helper image + * to synchronize downloading of firmware blocks. + */ +#define IF_CS_SQ_READ_LOW 0x00000028 +#define IF_CS_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 +/* + * Used to detect ancient chips: + */ +#define IF_CS_PRODUCT_ID 0x0000001C +#define IF_CS_CF8385_B1_REV 0x12 /********************************************************************/ @@ -228,8 +305,8 @@ static int if_cs_send_cmd(struct lbs_private *priv, u8 *buf, u16 nb) /* Is hardware ready? */ while (1) { - u16 val = if_cs_read16(card, IF_CS_CARD_STATUS); - if (val & IF_CS_BIT_COMMAND) + u16 status = if_cs_read16(card, IF_CS_CARD_STATUS); + if (status & IF_CS_BIT_COMMAND) break; if (++loops > 100) { lbs_pr_err("card not ready for commands\n"); @@ -238,12 +315,12 @@ static int if_cs_send_cmd(struct lbs_private *priv, u8 *buf, u16 nb) mdelay(1); } - if_cs_write16(card, IF_CS_HOST_CMD_LEN, nb); + if_cs_write16(card, IF_CS_CMD_LEN, nb); - if_cs_write16_rep(card, IF_CS_HOST_CMD, buf, nb / 2); + if_cs_write16_rep(card, IF_CS_CMD, buf, nb / 2); /* Are we supposed to transfer an odd amount of bytes? */ if (nb & 1) - if_cs_write8(card, IF_CS_HOST_CMD, buf[nb-1]); + if_cs_write8(card, IF_CS_CMD, buf[nb-1]); /* "Assert the download over interrupt command in the Host * status register" */ @@ -274,12 +351,12 @@ static void if_cs_send_data(struct lbs_private *priv, u8 *buf, u16 nb) status = if_cs_read16(card, IF_CS_CARD_STATUS); BUG_ON((status & IF_CS_BIT_TX) == 0); - if_cs_write16(card, IF_CS_HOST_WRITE_LEN, nb); + if_cs_write16(card, IF_CS_WRITE_LEN, nb); /* write even number of bytes, then odd byte if necessary */ - if_cs_write16_rep(card, IF_CS_HOST_WRITE, buf, nb / 2); + if_cs_write16_rep(card, IF_CS_WRITE, buf, nb / 2); if (nb & 1) - if_cs_write8(card, IF_CS_HOST_WRITE, buf[nb-1]); + if_cs_write8(card, IF_CS_WRITE, buf[nb-1]); if_cs_write16(card, IF_CS_HOST_STATUS, IF_CS_BIT_TX); if_cs_write16(card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_TX); @@ -307,16 +384,16 @@ static int if_cs_receive_cmdres(struct lbs_private *priv, u8 *data, u32 *len) goto out; } - *len = if_cs_read16(priv->card, IF_CS_CARD_CMD_LEN); + *len = if_cs_read16(priv->card, IF_CS_RESP_LEN); if ((*len == 0) || (*len > LBS_CMD_BUFFER_SIZE)) { lbs_pr_err("card cmd buffer has invalid # of bytes (%d)\n", *len); goto out; } /* read even number of bytes, then odd byte if necessary */ - if_cs_read16_rep(priv->card, IF_CS_CARD_CMD, data, *len/sizeof(u16)); + if_cs_read16_rep(priv->card, IF_CS_RESP, data, *len/sizeof(u16)); if (*len & 1) - data[*len-1] = if_cs_read8(priv->card, IF_CS_CARD_CMD); + data[*len-1] = if_cs_read8(priv->card, IF_CS_RESP); /* This is a workaround for a firmware that reports too much * bytes */ @@ -379,6 +456,8 @@ static irqreturn_t if_cs_interrupt(int irq, void *data) /* Ask card interrupt cause register if there is something for us */ cause = if_cs_read16(card, IF_CS_CARD_INT_CAUSE); + lbs_deb_cs("cause 0x%04x\n", cause); + if (cause == 0) { /* Not for us */ return IRQ_NONE; @@ -390,10 +469,6 @@ static irqreturn_t if_cs_interrupt(int irq, void *data) return IRQ_HANDLED; } - /* Clear interrupt cause */ - if_cs_write16(card, IF_CS_CARD_INT_CAUSE, cause & IF_CS_BIT_MASK); - lbs_deb_cs("cause 0x%04x\n", cause); - if (cause & IF_CS_BIT_RX) { struct sk_buff *skb; lbs_deb_cs("rx packet\n"); @@ -426,14 +501,15 @@ static irqreturn_t if_cs_interrupt(int irq, void *data) } if (cause & IF_CS_BIT_EVENT) { - u16 event = if_cs_read16(priv->card, IF_CS_CARD_STATUS) - & IF_CS_CARD_STATUS_MASK; + u16 status = if_cs_read16(priv->card, IF_CS_CARD_STATUS); if_cs_write16(priv->card, IF_CS_HOST_INT_CAUSE, IF_CS_BIT_EVENT); - lbs_deb_cs("host event 0x%04x\n", event); - lbs_queue_event(priv, event >> 8 & 0xff); + lbs_queue_event(priv, (status & IF_CS_CARD_STATUS_MASK) >> 8); } + /* Clear interrupt cause */ + if_cs_write16(card, IF_CS_CARD_INT_CAUSE, cause & IF_CS_BIT_MASK); + lbs_deb_leave(LBS_DEB_CS); return IRQ_HANDLED; } @@ -464,11 +540,11 @@ 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; } @@ -496,11 +572,11 @@ static int if_cs_prog_helper(struct if_cs_card *card) /* "write the number of bytes to be sent to the I/O Command * write length register" */ - if_cs_write16(card, IF_CS_HOST_CMD_LEN, count); + if_cs_write16(card, IF_CS_CMD_LEN, count); /* "write this to I/O Command port register as 16 bit writes */ if (count) - if_cs_write16_rep(card, IF_CS_HOST_CMD, + if_cs_write16_rep(card, IF_CS_CMD, &fw->data[sent], count >> 1); @@ -557,15 +633,15 @@ static int if_cs_prog_real(struct if_cs_card *card) } lbs_deb_cs("fw size %td\n", fw->size); - ret = if_cs_poll_while_fw_download(card, IF_CS_CARD_SQ_READ_LOW, - IF_CS_CARD_SQ_HELPER_OK); + ret = if_cs_poll_while_fw_download(card, IF_CS_SQ_READ_LOW, + IF_CS_SQ_HELPER_OK); if (ret < 0) { lbs_pr_err("helper firmware doesn't answer\n"); goto err_release; } for (sent = 0; sent < fw->size; sent += len) { - len = if_cs_read16(card, IF_CS_CARD_SQ_READ_LOW); + len = if_cs_read16(card, IF_CS_SQ_READ_LOW); if (len & 1) { retry++; lbs_pr_info("odd, need to retry this firmware block\n"); @@ -583,9 +659,9 @@ static int if_cs_prog_real(struct if_cs_card *card) } - if_cs_write16(card, IF_CS_HOST_CMD_LEN, len); + if_cs_write16(card, IF_CS_CMD_LEN, len); - if_cs_write16_rep(card, IF_CS_HOST_CMD, + if_cs_write16_rep(card, IF_CS_CMD, &fw->data[sent], (len+1) >> 1); if_cs_write8(card, IF_CS_HOST_STATUS, IF_CS_BIT_COMMAND); @@ -789,6 +865,12 @@ static int if_cs_probe(struct pcmcia_device *p_dev) p_dev->irq.AssignedIRQ, p_dev->io.BasePort1, p_dev->io.BasePort1 + p_dev->io.NumPorts1 - 1); + /* Check if we have a current silicon */ + if (if_cs_read8(card, IF_CS_PRODUCT_ID) < IF_CS_CF8385_B1_REV) { + lbs_pr_err("old chips like 8385 rev B1 aren't supported\n"); + ret = -ENODEV; + goto out2; + } /* Load the firmware early, before calling into libertas.ko */ ret = if_cs_prog_helper(card); |