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authorMichael Buesch <mb@bu3sch.de>2008-04-02 19:46:56 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-04-08 16:44:40 -0400
commitd625a29ba649a4df6027520ffc378f23c0e6883e (patch)
tree07b895d38717e24e655948c963f4287f551df42f
parent93af2614513103216038afa708718295e7016dbb (diff)
ssb: Add support for block-I/O
This adds support for block based I/O to SSB. This is needed in order to efficiently support PIO data transfers to the card. The block-I/O support is only compiled, if it's selected by the weird driver that needs it. So there's no overhead for sane devices. Signed-off-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--drivers/ssb/Kconfig5
-rw-r--r--drivers/ssb/main.c102
-rw-r--r--drivers/ssb/pci.c70
-rw-r--r--drivers/ssb/pcmcia.c119
-rw-r--r--include/linux/ssb/ssb.h19
5 files changed, 315 insertions, 0 deletions
diff --git a/drivers/ssb/Kconfig b/drivers/ssb/Kconfig
index 0f7cce2560d..cd845b8acd1 100644
--- a/drivers/ssb/Kconfig
+++ b/drivers/ssb/Kconfig
@@ -24,6 +24,11 @@ config SSB
config SSB_SPROM
bool
+# Support for Block-I/O. SELECT this from the driver that needs it.
+config SSB_BLOCKIO
+ bool
+ depends on SSB
+
config SSB_PCIHOST_POSSIBLE
bool
depends on SSB && (PCI = y || PCI = SSB)
diff --git a/drivers/ssb/main.c b/drivers/ssb/main.c
index 3e58db7ef60..19ddd2bd105 100644
--- a/drivers/ssb/main.c
+++ b/drivers/ssb/main.c
@@ -555,6 +555,55 @@ static u32 ssb_ssb_read32(struct ssb_device *dev, u16 offset)
return readl(bus->mmio + offset);
}
+#ifdef CONFIG_SSB_BLOCKIO
+static void ssb_ssb_block_read(struct ssb_device *dev, void *buffer,
+ size_t count, u16 offset, u8 reg_width)
+{
+ struct ssb_bus *bus = dev->bus;
+ void __iomem *addr;
+
+ offset += dev->core_index * SSB_CORE_SIZE;
+ addr = bus->mmio + offset;
+
+ switch (reg_width) {
+ case sizeof(u8): {
+ u8 *buf = buffer;
+
+ while (count) {
+ *buf = __raw_readb(addr);
+ buf++;
+ count--;
+ }
+ break;
+ }
+ case sizeof(u16): {
+ __le16 *buf = buffer;
+
+ SSB_WARN_ON(count & 1);
+ while (count) {
+ *buf = (__force __le16)__raw_readw(addr);
+ buf++;
+ count -= 2;
+ }
+ break;
+ }
+ case sizeof(u32): {
+ __le32 *buf = buffer;
+
+ SSB_WARN_ON(count & 3);
+ while (count) {
+ *buf = (__force __le32)__raw_readl(addr);
+ buf++;
+ count -= 4;
+ }
+ break;
+ }
+ default:
+ SSB_WARN_ON(1);
+ }
+}
+#endif /* CONFIG_SSB_BLOCKIO */
+
static void ssb_ssb_write8(struct ssb_device *dev, u16 offset, u8 value)
{
struct ssb_bus *bus = dev->bus;
@@ -579,6 +628,55 @@ static void ssb_ssb_write32(struct ssb_device *dev, u16 offset, u32 value)
writel(value, bus->mmio + offset);
}
+#ifdef CONFIG_SSB_BLOCKIO
+static void ssb_ssb_block_write(struct ssb_device *dev, const void *buffer,
+ size_t count, u16 offset, u8 reg_width)
+{
+ struct ssb_bus *bus = dev->bus;
+ void __iomem *addr;
+
+ offset += dev->core_index * SSB_CORE_SIZE;
+ addr = bus->mmio + offset;
+
+ switch (reg_width) {
+ case sizeof(u8): {
+ const u8 *buf = buffer;
+
+ while (count) {
+ __raw_writeb(*buf, addr);
+ buf++;
+ count--;
+ }
+ break;
+ }
+ case sizeof(u16): {
+ const __le16 *buf = buffer;
+
+ SSB_WARN_ON(count & 1);
+ while (count) {
+ __raw_writew((__force u16)(*buf), addr);
+ buf++;
+ count -= 2;
+ }
+ break;
+ }
+ case sizeof(u32): {
+ const __le32 *buf = buffer;
+
+ SSB_WARN_ON(count & 3);
+ while (count) {
+ __raw_writel((__force u32)(*buf), addr);
+ buf++;
+ count -= 4;
+ }
+ break;
+ }
+ default:
+ SSB_WARN_ON(1);
+ }
+}
+#endif /* CONFIG_SSB_BLOCKIO */
+
/* Ops for the plain SSB bus without a host-device (no PCI or PCMCIA). */
static const struct ssb_bus_ops ssb_ssb_ops = {
.read8 = ssb_ssb_read8,
@@ -587,6 +685,10 @@ static const struct ssb_bus_ops ssb_ssb_ops = {
.write8 = ssb_ssb_write8,
.write16 = ssb_ssb_write16,
.write32 = ssb_ssb_write32,
+#ifdef CONFIG_SSB_BLOCKIO
+ .block_read = ssb_ssb_block_read,
+ .block_write = ssb_ssb_block_write,
+#endif
};
static int ssb_fetch_invariants(struct ssb_bus *bus,
diff --git a/drivers/ssb/pci.c b/drivers/ssb/pci.c
index f1514b33cfa..904b1a8d088 100644
--- a/drivers/ssb/pci.c
+++ b/drivers/ssb/pci.c
@@ -613,6 +613,41 @@ static u32 ssb_pci_read32(struct ssb_device *dev, u16 offset)
return ioread32(bus->mmio + offset);
}
+#ifdef CONFIG_SSB_BLOCKIO
+static void ssb_pci_block_read(struct ssb_device *dev, void *buffer,
+ size_t count, u16 offset, u8 reg_width)
+{
+ struct ssb_bus *bus = dev->bus;
+ void __iomem *addr = bus->mmio + offset;
+
+ if (unlikely(ssb_pci_assert_buspower(bus)))
+ goto error;
+ if (unlikely(bus->mapped_device != dev)) {
+ if (unlikely(ssb_pci_switch_core(bus, dev)))
+ goto error;
+ }
+ switch (reg_width) {
+ case sizeof(u8):
+ ioread8_rep(addr, buffer, count);
+ break;
+ case sizeof(u16):
+ SSB_WARN_ON(count & 1);
+ ioread16_rep(addr, buffer, count >> 1);
+ break;
+ case sizeof(u32):
+ SSB_WARN_ON(count & 3);
+ ioread32_rep(addr, buffer, count >> 2);
+ break;
+ default:
+ SSB_WARN_ON(1);
+ }
+
+ return;
+error:
+ memset(buffer, 0xFF, count);
+}
+#endif /* CONFIG_SSB_BLOCKIO */
+
static void ssb_pci_write8(struct ssb_device *dev, u16 offset, u8 value)
{
struct ssb_bus *bus = dev->bus;
@@ -652,6 +687,37 @@ static void ssb_pci_write32(struct ssb_device *dev, u16 offset, u32 value)
iowrite32(value, bus->mmio + offset);
}
+#ifdef CONFIG_SSB_BLOCKIO
+static void ssb_pci_block_write(struct ssb_device *dev, const void *buffer,
+ size_t count, u16 offset, u8 reg_width)
+{
+ struct ssb_bus *bus = dev->bus;
+ void __iomem *addr = bus->mmio + offset;
+
+ if (unlikely(ssb_pci_assert_buspower(bus)))
+ return;
+ if (unlikely(bus->mapped_device != dev)) {
+ if (unlikely(ssb_pci_switch_core(bus, dev)))
+ return;
+ }
+ switch (reg_width) {
+ case sizeof(u8):
+ iowrite8_rep(addr, buffer, count);
+ break;
+ case sizeof(u16):
+ SSB_WARN_ON(count & 1);
+ iowrite16_rep(addr, buffer, count >> 1);
+ break;
+ case sizeof(u32):
+ SSB_WARN_ON(count & 3);
+ iowrite32_rep(addr, buffer, count >> 2);
+ break;
+ default:
+ SSB_WARN_ON(1);
+ }
+}
+#endif /* CONFIG_SSB_BLOCKIO */
+
/* Not "static", as it's used in main.c */
const struct ssb_bus_ops ssb_pci_ops = {
.read8 = ssb_pci_read8,
@@ -660,6 +726,10 @@ const struct ssb_bus_ops ssb_pci_ops = {
.write8 = ssb_pci_write8,
.write16 = ssb_pci_write16,
.write32 = ssb_pci_write32,
+#ifdef CONFIG_SSB_BLOCKIO
+ .block_read = ssb_pci_block_read,
+ .block_write = ssb_pci_block_write,
+#endif
};
static ssize_t ssb_pci_attr_sprom_show(struct device *pcidev,
diff --git a/drivers/ssb/pcmcia.c b/drivers/ssb/pcmcia.c
index dcaf2412bea..24c2a46c147 100644
--- a/drivers/ssb/pcmcia.c
+++ b/drivers/ssb/pcmcia.c
@@ -285,6 +285,64 @@ static u32 ssb_pcmcia_read32(struct ssb_device *dev, u16 offset)
return (lo | (hi << 16));
}
+#ifdef CONFIG_SSB_BLOCKIO
+static void ssb_pcmcia_block_read(struct ssb_device *dev, void *buffer,
+ size_t count, u16 offset, u8 reg_width)
+{
+ struct ssb_bus *bus = dev->bus;
+ unsigned long flags;
+ void __iomem *addr = bus->mmio + offset;
+ int err;
+
+ spin_lock_irqsave(&bus->bar_lock, flags);
+ err = select_core_and_segment(dev, &offset);
+ if (unlikely(err)) {
+ memset(buffer, 0xFF, count);
+ goto unlock;
+ }
+ switch (reg_width) {
+ case sizeof(u8): {
+ u8 *buf = buffer;
+
+ while (count) {
+ *buf = __raw_readb(addr);
+ buf++;
+ count--;
+ }
+ break;
+ }
+ case sizeof(u16): {
+ __le16 *buf = buffer;
+
+ SSB_WARN_ON(count & 1);
+ while (count) {
+ *buf = (__force __le16)__raw_readw(addr);
+ buf++;
+ count -= 2;
+ }
+ break;
+ }
+ case sizeof(u32): {
+ __le16 *buf = buffer;
+
+ SSB_WARN_ON(count & 3);
+ while (count) {
+ *buf = (__force __le16)__raw_readw(addr);
+ buf++;
+ *buf = (__force __le16)__raw_readw(addr + 2);
+ buf++;
+ count -= 4;
+ }
+ break;
+ }
+ default:
+ SSB_WARN_ON(1);
+ }
+unlock:
+ spin_unlock_irqrestore(&bus->bar_lock, flags);
+}
+#endif /* CONFIG_SSB_BLOCKIO */
+
static void ssb_pcmcia_write8(struct ssb_device *dev, u16 offset, u8 value)
{
struct ssb_bus *bus = dev->bus;
@@ -329,6 +387,63 @@ static void ssb_pcmcia_write32(struct ssb_device *dev, u16 offset, u32 value)
spin_unlock_irqrestore(&bus->bar_lock, flags);
}
+#ifdef CONFIG_SSB_BLOCKIO
+static void ssb_pcmcia_block_write(struct ssb_device *dev, const void *buffer,
+ size_t count, u16 offset, u8 reg_width)
+{
+ struct ssb_bus *bus = dev->bus;
+ unsigned long flags;
+ void __iomem *addr = bus->mmio + offset;
+ int err;
+
+ spin_lock_irqsave(&bus->bar_lock, flags);
+ err = select_core_and_segment(dev, &offset);
+ if (unlikely(err))
+ goto unlock;
+ switch (reg_width) {
+ case sizeof(u8): {
+ const u8 *buf = buffer;
+
+ while (count) {
+ __raw_writeb(*buf, addr);
+ buf++;
+ count--;
+ }
+ break;
+ }
+ case sizeof(u16): {
+ const __le16 *buf = buffer;
+
+ SSB_WARN_ON(count & 1);
+ while (count) {
+ __raw_writew((__force u16)(*buf), addr);
+ buf++;
+ count -= 2;
+ }
+ break;
+ }
+ case sizeof(u32): {
+ const __le16 *buf = buffer;
+
+ SSB_WARN_ON(count & 3);
+ while (count) {
+ __raw_writew((__force u16)(*buf), addr);
+ buf++;
+ __raw_writew((__force u16)(*buf), addr + 2);
+ buf++;
+ count -= 4;
+ }
+ break;
+ }
+ default:
+ SSB_WARN_ON(1);
+ }
+unlock:
+ mmiowb();
+ spin_unlock_irqrestore(&bus->bar_lock, flags);
+}
+#endif /* CONFIG_SSB_BLOCKIO */
+
/* Not "static", as it's used in main.c */
const struct ssb_bus_ops ssb_pcmcia_ops = {
.read8 = ssb_pcmcia_read8,
@@ -337,6 +452,10 @@ const struct ssb_bus_ops ssb_pcmcia_ops = {
.write8 = ssb_pcmcia_write8,
.write16 = ssb_pcmcia_write16,
.write32 = ssb_pcmcia_write32,
+#ifdef CONFIG_SSB_BLOCKIO
+ .block_read = ssb_pcmcia_block_read,
+ .block_write = ssb_pcmcia_block_write,
+#endif
};
static int ssb_pcmcia_sprom_command(struct ssb_bus *bus, u8 command)
diff --git a/include/linux/ssb/ssb.h b/include/linux/ssb/ssb.h
index a8ca396f810..9f95afd0e9e 100644
--- a/include/linux/ssb/ssb.h
+++ b/include/linux/ssb/ssb.h
@@ -78,6 +78,12 @@ struct ssb_bus_ops {
void (*write8)(struct ssb_device *dev, u16 offset, u8 value);
void (*write16)(struct ssb_device *dev, u16 offset, u16 value);
void (*write32)(struct ssb_device *dev, u16 offset, u32 value);
+#ifdef CONFIG_SSB_BLOCKIO
+ void (*block_read)(struct ssb_device *dev, void *buffer,
+ size_t count, u16 offset, u8 reg_width);
+ void (*block_write)(struct ssb_device *dev, const void *buffer,
+ size_t count, u16 offset, u8 reg_width);
+#endif
};
@@ -374,6 +380,19 @@ static inline void ssb_write32(struct ssb_device *dev, u16 offset, u32 value)
{
dev->ops->write32(dev, offset, value);
}
+#ifdef CONFIG_SSB_BLOCKIO
+static inline void ssb_block_read(struct ssb_device *dev, void *buffer,
+ size_t count, u16 offset, u8 reg_width)
+{
+ dev->ops->block_read(dev, buffer, count, offset, reg_width);
+}
+
+static inline void ssb_block_write(struct ssb_device *dev, const void *buffer,
+ size_t count, u16 offset, u8 reg_width)
+{
+ dev->ops->block_write(dev, buffer, count, offset, reg_width);
+}
+#endif /* CONFIG_SSB_BLOCKIO */
/* Translation (routing) bits that need to be ORed to DMA