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Date: Wed, 5 Nov 2008 10:35:38 +0000
From: Steve Glendinning <steve.glendinning@...c.com>
To: netdev@...r.kernel.org
Cc: catalin.marinas@....com, Bahadir.Balban@....com,
dustin@...soria.com, bgat@...lgatliff.com,
Ian Saturley <ian.saturley@...c.com>, g.liakhovetski@....de,
Peter Korsgaard <jacmet@...site.dk>,
Steve Glendinning <steve.glendinning@...c.com>
Subject: [PATCH 2/6] 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@...c.com>
---
drivers/net/smsc911x.c | 158 +++++++++++++++++++++++-----------------------
drivers/net/smsc911x.h | 1 -
include/linux/smsc911x.h | 5 ++
3 files changed, 84 insertions(+), 80 deletions(-)
diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
index fe51788..4b8ff84 100644
--- a/drivers/net/smsc911x.c
+++ b/drivers/net/smsc911x.c
@@ -77,19 +77,16 @@ struct smsc911x_data {
unsigned int generation;
/* device configuration (copied from platform_data during probe) */
- unsigned int irq_polarity;
- unsigned int irq_type;
- phy_interface_t phy_interface;
+ struct smsc911x_platform_config config;
/* This needs to be acquired before calling any of below:
* smsc911x_mac_read(), smsc911x_mac_write()
*/
spinlock_t mac_lock;
-#if (!SMSC_CAN_USE_32BIT)
- /* spinlock to ensure 16-bit accesses are serialised */
+ /* spinlock to ensure 16-bit accesses are serialised.
+ * unused with a 32-bit bus */
spinlock_t dev_lock;
-#endif
struct phy_device *phy_dev;
struct mii_bus *mii_bus;
@@ -121,70 +118,56 @@ struct smsc911x_data {
unsigned int hashlo;
};
-#if SMSC_CAN_USE_32BIT
-
-static inline u32 smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
-{
- return readl(pdata->ioaddr + reg);
-}
-
-static inline void smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
- u32 val)
-{
- writel(val, pdata->ioaddr + reg);
-}
-
-/* Writes a packet to the TX_DATA_FIFO */
-static inline void
-smsc911x_tx_writefifo(struct smsc911x_data *pdata, unsigned int *buf,
- unsigned int wordcount)
-{
- writesl(pdata->ioaddr + TX_DATA_FIFO, buf, wordcount);
-}
-
-/* Reads a packet out of the RX_DATA_FIFO */
-static inline void
-smsc911x_rx_readfifo(struct smsc911x_data *pdata, unsigned int *buf,
- unsigned int wordcount)
-{
- readsl(pdata->ioaddr + RX_DATA_FIFO, buf, wordcount);
-}
-
-#else /* SMSC_CAN_USE_32BIT */
-
-/* These 16-bit access functions are significantly slower, due to the locking
+/* The 16-bit access functions are significantly slower, due to the locking
* necessary. If your bus hardware can be configured to do this for you
* (in response to a single 32-bit operation from software), you should use
* the 32-bit access functions instead. */
static inline u32 smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
{
- unsigned long flags;
- u32 data;
-
- /* these two 16-bit reads must be performed consecutively, so must
- * not be interrupted by our own ISR (which would start another
- * read operation) */
- spin_lock_irqsave(&pdata->dev_lock, flags);
- data = ((readw(pdata->ioaddr + reg) & 0xFFFF) |
- ((readw(pdata->ioaddr + reg + 2) & 0xFFFF) << 16));
- spin_unlock_irqrestore(&pdata->dev_lock, flags);
+ if (pdata->config.flags & SMSC911X_USE_32BIT)
+ return readl(pdata->ioaddr + reg);
+
+ if (pdata->config.flags & SMSC911X_USE_16BIT) {
+ u32 data;
+ unsigned long flags;
+
+ /* these two 16-bit reads must be performed consecutively, so
+ * must not be interrupted by our own ISR (which would start
+ * another read operation) */
+ spin_lock_irqsave(&pdata->dev_lock, flags);
+ data = ((readw(pdata->ioaddr + reg) & 0xFFFF) |
+ ((readw(pdata->ioaddr + reg + 2) & 0xFFFF) << 16));
+ spin_unlock_irqrestore(&pdata->dev_lock, flags);
+
+ return data;
+ }
- return data;
+ BUG();
}
static inline void smsc911x_reg_write(struct smsc911x_data *pdata, u32 reg,
u32 val)
{
- unsigned long flags;
+ if (pdata->config.flags & SMSC911X_USE_32BIT) {
+ writel(val, pdata->ioaddr + reg);
+ return;
+ }
+
+ if (pdata->config.flags & SMSC911X_USE_16BIT) {
+ unsigned long flags;
+
+ /* these two 16-bit writes must be performed consecutively, so
+ * must not be interrupted by our own ISR (which would start
+ * another read operation) */
+ spin_lock_irqsave(&pdata->dev_lock, flags);
+ writew(val & 0xFFFF, pdata->ioaddr + reg);
+ writew((val >> 16) & 0xFFFF, pdata->ioaddr + reg + 2);
+ spin_unlock_irqrestore(&pdata->dev_lock, flags);
+ return;
+ }
- /* these two 16-bit writes must be performed consecutively, so must
- * not be interrupted by our own ISR (which would start another
- * read operation) */
- spin_lock_irqsave(&pdata->dev_lock, flags);
- writew(val & 0xFFFF, pdata->ioaddr + reg);
- writew((val >> 16) & 0xFFFF, pdata->ioaddr + reg + 2);
- spin_unlock_irqrestore(&pdata->dev_lock, flags);
+ BUG();
}
/* Writes a packet to the TX_DATA_FIFO */
@@ -192,8 +175,18 @@ static inline void
smsc911x_tx_writefifo(struct smsc911x_data *pdata, unsigned int *buf,
unsigned int wordcount)
{
- while (wordcount--)
- smsc911x_reg_write(pdata, TX_DATA_FIFO, *buf++);
+ if (pdata->config.flags & SMSC911X_USE_32BIT) {
+ writesl(pdata->ioaddr + TX_DATA_FIFO, buf, wordcount);
+ return;
+ }
+
+ if (pdata->config.flags & SMSC911X_USE_16BIT) {
+ while (wordcount--)
+ smsc911x_reg_write(pdata, TX_DATA_FIFO, *buf++);
+ return;
+ }
+
+ BUG();
}
/* Reads a packet out of the RX_DATA_FIFO */
@@ -201,11 +194,19 @@ static inline void
smsc911x_rx_readfifo(struct smsc911x_data *pdata, unsigned int *buf,
unsigned int wordcount)
{
- while (wordcount--)
- *buf++ = smsc911x_reg_read(pdata, RX_DATA_FIFO);
-}
+ if (pdata->config.flags & SMSC911X_USE_32BIT) {
+ readsl(pdata->ioaddr + RX_DATA_FIFO, buf, wordcount);
+ return;
+ }
-#endif /* SMSC_CAN_USE_32BIT */
+ if (pdata->config.flags & SMSC911X_USE_16BIT) {
+ while (wordcount--)
+ *buf++ = smsc911x_reg_read(pdata, RX_DATA_FIFO);
+ return;
+ }
+
+ BUG();
+}
/* waits for MAC not busy, with timeout. Only called by smsc911x_mac_read
* and smsc911x_mac_write, so assumes mac_lock is held */
@@ -790,7 +791,7 @@ static int smsc911x_mii_probe(struct net_device *dev)
}
phydev = phy_connect(dev, phydev->dev.bus_id,
- &smsc911x_phy_adjust_link, 0, pdata->phy_interface);
+ &smsc911x_phy_adjust_link, 0, pdata->config.phy_interface);
if (IS_ERR(phydev)) {
pr_err("%s: Could not attach to PHY\n", dev->name);
@@ -1205,14 +1206,14 @@ static int smsc911x_open(struct net_device *dev)
/* Set interrupt deassertion to 100uS */
intcfg = ((10 << 24) | INT_CFG_IRQ_EN_);
- if (pdata->irq_polarity) {
+ if (pdata->config.irq_polarity) {
SMSC_TRACE(IFUP, "irq polarity: active high");
intcfg |= INT_CFG_IRQ_POL_;
} else {
SMSC_TRACE(IFUP, "irq polarity: active low");
}
- if (pdata->irq_type) {
+ if (pdata->config.irq_type) {
SMSC_TRACE(IFUP, "irq type: push-pull");
intcfg |= INT_CFG_IRQ_TYPE_;
} else {
@@ -1767,9 +1768,7 @@ static int __devinit smsc911x_init(struct net_device *dev)
SMSC_TRACE(PROBE, "IRQ: %d", dev->irq);
SMSC_TRACE(PROBE, "PHY will be autodetected.");
-#if (!SMSC_CAN_USE_32BIT)
spin_lock_init(&pdata->dev_lock);
-#endif
if (pdata->ioaddr == 0) {
SMSC_WARNING(PROBE, "pdata->ioaddr: 0x00000000");
@@ -1910,6 +1909,7 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
{
struct net_device *dev;
struct smsc911x_data *pdata;
+ struct smsc911x_platform_config *config = pdev->dev.platform_data;
struct resource *res;
unsigned int intcfg = 0;
int res_size;
@@ -1918,6 +1918,13 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
pr_info("%s: Driver version %s.\n", SMSC_CHIPNAME, SMSC_DRV_VERSION);
+ /* platform data specifies irq & dynamic bus configuration */
+ if (!pdev->dev.platform_data) {
+ pr_warning("%s: platform_data not provided\n", SMSC_CHIPNAME);
+ retval = -ENODEV;
+ goto out_0;
+ }
+
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"smsc911x-memory");
if (!res)
@@ -1949,15 +1956,8 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
dev->irq = platform_get_irq(pdev, 0);
pdata->ioaddr = ioremap_nocache(res->start, res_size);
- /* copy config parameters across if present, otherwise pdata
- * defaults to zeros */
- if (pdev->dev.platform_data) {
- struct smsc911x_platform_config *config =
- pdev->dev.platform_data;
- pdata->irq_polarity = config->irq_polarity;
- pdata->irq_type = config->irq_type;
- pdata->phy_interface = config->phy_interface;
- }
+ /* copy config parameters across to pdata */
+ memcpy(&pdata->config, config, sizeof(pdata->config));
pdata->dev = dev;
pdata->msg_enable = ((1 << debug) - 1);
@@ -1974,10 +1974,10 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev)
goto out_unmap_io_3;
/* configure irq polarity and type before connecting isr */
- if (pdata->irq_polarity == SMSC911X_IRQ_POLARITY_ACTIVE_HIGH)
+ if (pdata->config.irq_polarity == SMSC911X_IRQ_POLARITY_ACTIVE_HIGH)
intcfg |= INT_CFG_IRQ_POL_;
- if (pdata->irq_type == SMSC911X_IRQ_TYPE_PUSH_PULL)
+ if (pdata->config.irq_type == SMSC911X_IRQ_TYPE_PUSH_PULL)
intcfg |= INT_CFG_IRQ_TYPE_;
smsc911x_reg_write(pdata, INT_CFG, intcfg);
diff --git a/drivers/net/smsc911x.h b/drivers/net/smsc911x.h
index feb36de..f818cf0 100644
--- a/drivers/net/smsc911x.h
+++ b/drivers/net/smsc911x.h
@@ -21,7 +21,6 @@
#ifndef __SMSC911X_H__
#define __SMSC911X_H__
-#define SMSC_CAN_USE_32BIT 1
#define TX_FIFO_LOW_THRESHOLD ((u32)1600)
#define SMSC911X_EEPROM_SIZE ((u32)7)
#define USE_DEBUG 0
diff --git a/include/linux/smsc911x.h b/include/linux/smsc911x.h
index 47c4ffd..1cbf031 100644
--- a/include/linux/smsc911x.h
+++ b/include/linux/smsc911x.h
@@ -28,6 +28,7 @@
struct smsc911x_platform_config {
unsigned int irq_polarity;
unsigned int irq_type;
+ unsigned int flags;
phy_interface_t phy_interface;
};
@@ -39,4 +40,8 @@ struct smsc911x_platform_config {
#define SMSC911X_IRQ_TYPE_OPEN_DRAIN 0
#define SMSC911X_IRQ_TYPE_PUSH_PULL 1
+/* Constants for flags */
+#define SMSC911X_USE_16BIT (BIT(0))
+#define SMSC911X_USE_32BIT (BIT(1))
+
#endif /* __LINUX_SMSC911X_H__ */
--
1.5.6.5
--
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