diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/dm9000.c | 53 |
1 files changed, 39 insertions, 14 deletions
diff --git a/drivers/net/dm9000.c b/drivers/net/dm9000.c index fa7eb39dbf3..a769c89a369 100644 --- a/drivers/net/dm9000.c +++ b/drivers/net/dm9000.c @@ -102,6 +102,24 @@ static int watchdog = 5000; module_param(watchdog, int, 0400); MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds"); +/* DM9000 register address locking. + * + * The DM9000 uses an address register to control where data written + * to the data register goes. This means that the address register + * must be preserved over interrupts or similar calls. + * + * During interrupt and other critical calls, a spinlock is used to + * protect the system, but the calls themselves save the address + * in the address register in case they are interrupting another + * access to the device. + * + * For general accesses a lock is provided so that calls which are + * allowed to sleep are serialised so that the address register does + * not need to be saved. This lock also serves to serialise access + * to the EEPROM and PHY access registers which are shared between + * these two devices. + */ + /* Structure/enum declaration ------------------------------- */ typedef struct board_info { @@ -132,6 +150,8 @@ typedef struct board_info { struct resource *data_req; struct resource *irq_res; + struct mutex addr_lock; /* phy and eeprom access lock */ + spinlock_t lock; struct mii_if_info mii; @@ -365,26 +385,16 @@ static void dm9000_get_drvinfo(struct net_device *dev, static int dm9000_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { board_info_t *dm = to_dm9000_board(dev); - unsigned long flags; - spin_lock_irqsave(&dm->lock, flags); mii_ethtool_gset(&dm->mii, cmd); - spin_lock_irqsave(&dm->lock, flags); - return 0; } static int dm9000_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) { board_info_t *dm = to_dm9000_board(dev); - unsigned long flags; - int rc; - - spin_lock_irqsave(&dm->lock, flags); - rc = mii_ethtool_sset(&dm->mii, cmd); - spin_lock_irqsave(&dm->lock, flags); - return rc; + return mii_ethtool_sset(&dm->mii, cmd); } static int dm9000_nway_reset(struct net_device *dev) @@ -475,6 +485,7 @@ dm9000_probe(struct platform_device *pdev) db->dev = &pdev->dev; spin_lock_init(&db->lock); + mutex_init(&db->addr_lock); if (pdev->num_resources < 2) { ret = -ENODEV; @@ -997,8 +1008,10 @@ dm9000_rx(struct net_device *dev) * Read a word data from EEPROM */ static void -dm9000_read_eeprom(board_info_t * db, int offset, unsigned char *to) +dm9000_read_eeprom(board_info_t *db, int offset, unsigned char *to) { + mutex_lock(&db->addr_lock); + iow(db, DM9000_EPAR, offset); iow(db, DM9000_EPCR, EPCR_ERPRR); mdelay(8); /* according to the datasheet 200us should be enough, @@ -1007,6 +1020,8 @@ dm9000_read_eeprom(board_info_t * db, int offset, unsigned char *to) to[0] = ior(db, DM9000_EPDRL); to[1] = ior(db, DM9000_EPDRH); + + mutex_unlock(&db->addr_lock); } #ifdef DM9000_PROGRAM_EEPROM @@ -1016,12 +1031,16 @@ dm9000_read_eeprom(board_info_t * db, int offset, unsigned char *to) static void write_srom_word(board_info_t * db, int offset, u16 val) { + mutex_lock(&db->addr_lock); + iow(db, DM9000_EPAR, offset); iow(db, DM9000_EPDRH, ((val >> 8) & 0xff)); iow(db, DM9000_EPDRL, (val & 0xff)); iow(db, DM9000_EPCR, EPCR_WEP | EPCR_ERPRW); mdelay(8); /* same shit */ iow(db, DM9000_EPCR, 0); + + mutex_unlock(&db->addr_lock); } /* @@ -1129,6 +1148,8 @@ dm9000_phy_read(struct net_device *dev, int phy_reg_unused, int reg) unsigned int reg_save; int ret; + mutex_lock(&db->addr_lock); + spin_lock_irqsave(&db->lock,flags); /* Save previous register address */ @@ -1156,6 +1177,7 @@ dm9000_phy_read(struct net_device *dev, int phy_reg_unused, int reg) writeb(reg_save, db->io_addr); spin_unlock_irqrestore(&db->lock,flags); + mutex_unlock(&db->addr_lock); return ret; } @@ -1169,6 +1191,8 @@ dm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg, int value) unsigned long flags; unsigned long reg_save; + mutex_lock(&db->addr_lock); + spin_lock_irqsave(&db->lock,flags); /* Save previous register address */ @@ -1184,7 +1208,7 @@ dm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg, int value) iow(db, DM9000_EPCR, 0xa); /* Issue phyxcer write command */ writeb(reg_save, db->io_addr); - spin_unlock_irqrestore(&db->lock,flags); + spin_unlock_irqrestore(&db->lock, flags); dm9000_msleep(db, 1); /* Wait write complete */ @@ -1196,7 +1220,8 @@ dm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg, int value) /* restore the previous address */ writeb(reg_save, db->io_addr); - spin_unlock_irqrestore(&db->lock,flags); + spin_unlock_irqrestore(&db->lock, flags); + mutex_unlock(&db->addr_lock); } static int |