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smsc911x: add dynamic bus configuration
Convert the driver to select 16-bit or 32-bit bus access at runtime, at a small performance cost. Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steve Glendinning
David S. Miller
parent
6fabd715e6
commit
2107fb8b5b
3 changed files with 83 additions and 79 deletions
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@ -77,19 +77,16 @@ struct smsc911x_data {
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unsigned int generation;
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/* device configuration (copied from platform_data during probe) */
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unsigned int irq_polarity;
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unsigned int irq_type;
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phy_interface_t phy_interface;
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struct smsc911x_platform_config config;
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/* This needs to be acquired before calling any of below:
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* smsc911x_mac_read(), smsc911x_mac_write()
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*/
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spinlock_t mac_lock;
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#if (!SMSC_CAN_USE_32BIT)
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/* spinlock to ensure 16-bit accesses are serialised */
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/* spinlock to ensure 16-bit accesses are serialised.
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* unused with a 32-bit bus */
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spinlock_t dev_lock;
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#endif
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struct phy_device *phy_dev;
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struct mii_bus *mii_bus;
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@ -121,70 +118,56 @@ struct smsc911x_data {
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unsigned int hashlo;
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};
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#if SMSC_CAN_USE_32BIT
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static inline u32 smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
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{
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return readl(pdata->ioaddr + reg);
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}
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static inline void smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
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u32 val)
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{
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writel(val, pdata->ioaddr + reg);
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}
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/* Writes a packet to the TX_DATA_FIFO */
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static inline void
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smsc911x_tx_writefifo(struct smsc911x_data *pdata, unsigned int *buf,
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unsigned int wordcount)
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{
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writesl(pdata->ioaddr + TX_DATA_FIFO, buf, wordcount);
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}
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/* Reads a packet out of the RX_DATA_FIFO */
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static inline void
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smsc911x_rx_readfifo(struct smsc911x_data *pdata, unsigned int *buf,
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unsigned int wordcount)
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{
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readsl(pdata->ioaddr + RX_DATA_FIFO, buf, wordcount);
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}
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#else /* SMSC_CAN_USE_32BIT */
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/* These 16-bit access functions are significantly slower, due to the locking
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/* The 16-bit access functions are significantly slower, due to the locking
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* necessary. If your bus hardware can be configured to do this for you
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* (in response to a single 32-bit operation from software), you should use
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* the 32-bit access functions instead. */
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static inline u32 smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
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{
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unsigned long flags;
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u32 data;
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if (pdata->config.flags & SMSC911X_USE_32BIT)
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return readl(pdata->ioaddr + reg);
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/* these two 16-bit reads must be performed consecutively, so must
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* not be interrupted by our own ISR (which would start another
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* read operation) */
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spin_lock_irqsave(&pdata->dev_lock, flags);
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data = ((readw(pdata->ioaddr + reg) & 0xFFFF) |
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((readw(pdata->ioaddr + reg + 2) & 0xFFFF) << 16));
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spin_unlock_irqrestore(&pdata->dev_lock, flags);
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if (pdata->config.flags & SMSC911X_USE_16BIT) {
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u32 data;
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unsigned long flags;
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return data;
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/* these two 16-bit reads must be performed consecutively, so
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* must not be interrupted by our own ISR (which would start
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* another read operation) */
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spin_lock_irqsave(&pdata->dev_lock, flags);
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data = ((readw(pdata->ioaddr + reg) & 0xFFFF) |
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((readw(pdata->ioaddr + reg + 2) & 0xFFFF) << 16));
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spin_unlock_irqrestore(&pdata->dev_lock, flags);
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return data;
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}
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BUG();
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}
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static inline void smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
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u32 val)
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{
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unsigned long flags;
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if (pdata->config.flags & SMSC911X_USE_32BIT) {
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writel(val, pdata->ioaddr + reg);
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return;
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}
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/* these two 16-bit writes must be performed consecutively, so must
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* not be interrupted by our own ISR (which would start another
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* read operation) */
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spin_lock_irqsave(&pdata->dev_lock, flags);
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writew(val & 0xFFFF, pdata->ioaddr + reg);
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writew((val >> 16) & 0xFFFF, pdata->ioaddr + reg + 2);
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spin_unlock_irqrestore(&pdata->dev_lock, flags);
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if (pdata->config.flags & SMSC911X_USE_16BIT) {
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unsigned long flags;
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/* these two 16-bit writes must be performed consecutively, so
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* must not be interrupted by our own ISR (which would start
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* another read operation) */
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spin_lock_irqsave(&pdata->dev_lock, flags);
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writew(val & 0xFFFF, pdata->ioaddr + reg);
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writew((val >> 16) & 0xFFFF, pdata->ioaddr + reg + 2);
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spin_unlock_irqrestore(&pdata->dev_lock, flags);
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return;
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}
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BUG();
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}
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/* Writes a packet to the TX_DATA_FIFO */
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@ -192,8 +175,18 @@ static inline void
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smsc911x_tx_writefifo(struct smsc911x_data *pdata, unsigned int *buf,
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unsigned int wordcount)
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{
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while (wordcount--)
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smsc911x_reg_write(pdata, TX_DATA_FIFO, *buf++);
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if (pdata->config.flags & SMSC911X_USE_32BIT) {
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writesl(pdata->ioaddr + TX_DATA_FIFO, buf, wordcount);
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return;
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}
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if (pdata->config.flags & SMSC911X_USE_16BIT) {
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while (wordcount--)
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smsc911x_reg_write(pdata, TX_DATA_FIFO, *buf++);
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return;
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}
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BUG();
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}
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/* Reads a packet out of the RX_DATA_FIFO */
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@ -201,11 +194,19 @@ static inline void
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smsc911x_rx_readfifo(struct smsc911x_data *pdata, unsigned int *buf,
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unsigned int wordcount)
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{
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while (wordcount--)
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*buf++ = smsc911x_reg_read(pdata, RX_DATA_FIFO);
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}
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if (pdata->config.flags & SMSC911X_USE_32BIT) {
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readsl(pdata->ioaddr + RX_DATA_FIFO, buf, wordcount);
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return;
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}
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#endif /* SMSC_CAN_USE_32BIT */
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if (pdata->config.flags & SMSC911X_USE_16BIT) {
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while (wordcount--)
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*buf++ = smsc911x_reg_read(pdata, RX_DATA_FIFO);
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return;
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}
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BUG();
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}
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/* waits for MAC not busy, with timeout. Only called by smsc911x_mac_read
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* and smsc911x_mac_write, so assumes mac_lock is held */
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@ -790,7 +791,7 @@ static int smsc911x_mii_probe(struct net_device *dev)
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}
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phydev = phy_connect(dev, phydev->dev.bus_id,
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&smsc911x_phy_adjust_link, 0, pdata->phy_interface);
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&smsc911x_phy_adjust_link, 0, pdata->config.phy_interface);
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if (IS_ERR(phydev)) {
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pr_err("%s: Could not attach to PHY\n", dev->name);
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@ -1205,14 +1206,14 @@ static int smsc911x_open(struct net_device *dev)
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/* Set interrupt deassertion to 100uS */
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intcfg = ((10 << 24) | INT_CFG_IRQ_EN_);
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if (pdata->irq_polarity) {
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if (pdata->config.irq_polarity) {
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SMSC_TRACE(IFUP, "irq polarity: active high");
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intcfg |= INT_CFG_IRQ_POL_;
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} else {
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SMSC_TRACE(IFUP, "irq polarity: active low");
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}
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if (pdata->irq_type) {
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if (pdata->config.irq_type) {
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SMSC_TRACE(IFUP, "irq type: push-pull");
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intcfg |= INT_CFG_IRQ_TYPE_;
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} else {
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@ -1767,9 +1768,7 @@ static int __devinit smsc911x_init(struct net_device *dev)
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SMSC_TRACE(PROBE, "IRQ: %d", dev->irq);
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SMSC_TRACE(PROBE, "PHY will be autodetected.");
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#if (!SMSC_CAN_USE_32BIT)
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spin_lock_init(&pdata->dev_lock);
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#endif
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if (pdata->ioaddr == 0) {
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SMSC_WARNING(PROBE, "pdata->ioaddr: 0x00000000");
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@ -1910,6 +1909,7 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
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{
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struct net_device *dev;
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struct smsc911x_data *pdata;
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struct smsc911x_platform_config *config = pdev->dev.platform_data;
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struct resource *res;
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unsigned int intcfg = 0;
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int res_size;
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@ -1918,6 +1918,13 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
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pr_info("%s: Driver version %s.\n", SMSC_CHIPNAME, SMSC_DRV_VERSION);
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/* platform data specifies irq & dynamic bus configuration */
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if (!pdev->dev.platform_data) {
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pr_warning("%s: platform_data not provided\n", SMSC_CHIPNAME);
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retval = -ENODEV;
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goto out_0;
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}
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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"smsc911x-memory");
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if (!res)
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@ -1949,15 +1956,8 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
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dev->irq = platform_get_irq(pdev, 0);
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pdata->ioaddr = ioremap_nocache(res->start, res_size);
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/* copy config parameters across if present, otherwise pdata
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* defaults to zeros */
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if (pdev->dev.platform_data) {
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struct smsc911x_platform_config *config =
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pdev->dev.platform_data;
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pdata->irq_polarity = config->irq_polarity;
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pdata->irq_type = config->irq_type;
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pdata->phy_interface = config->phy_interface;
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}
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/* copy config parameters across to pdata */
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memcpy(&pdata->config, config, sizeof(pdata->config));
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pdata->dev = dev;
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pdata->msg_enable = ((1 << debug) - 1);
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@ -1974,10 +1974,10 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
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goto out_unmap_io_3;
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/* configure irq polarity and type before connecting isr */
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if (pdata->irq_polarity == SMSC911X_IRQ_POLARITY_ACTIVE_HIGH)
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if (pdata->config.irq_polarity == SMSC911X_IRQ_POLARITY_ACTIVE_HIGH)
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intcfg |= INT_CFG_IRQ_POL_;
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if (pdata->irq_type == SMSC911X_IRQ_TYPE_PUSH_PULL)
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if (pdata->config.irq_type == SMSC911X_IRQ_TYPE_PUSH_PULL)
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intcfg |= INT_CFG_IRQ_TYPE_;
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smsc911x_reg_write(pdata, INT_CFG, intcfg);
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@ -21,7 +21,6 @@
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#ifndef __SMSC911X_H__
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#define __SMSC911X_H__
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#define SMSC_CAN_USE_32BIT 1
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#define TX_FIFO_LOW_THRESHOLD ((u32)1600)
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#define SMSC911X_EEPROM_SIZE ((u32)7)
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#define USE_DEBUG 0
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@ -28,6 +28,7 @@
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struct smsc911x_platform_config {
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unsigned int irq_polarity;
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unsigned int irq_type;
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unsigned int flags;
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phy_interface_t phy_interface;
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};
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@ -39,4 +40,8 @@ struct smsc911x_platform_config {
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#define SMSC911X_IRQ_TYPE_OPEN_DRAIN 0
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#define SMSC911X_IRQ_TYPE_PUSH_PULL 1
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/* Constants for flags */
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#define SMSC911X_USE_16BIT (BIT(0))
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#define SMSC911X_USE_32BIT (BIT(1))
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#endif /* __LINUX_SMSC911X_H__ */
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