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-rw-r--r--arch/arm/mach-sa1100/generic.c25
-rw-r--r--drivers/dma/Kconfig9
-rw-r--r--drivers/dma/Makefile1
-rw-r--r--drivers/dma/sa11x0-dma.c1109
-rw-r--r--drivers/net/irda/Kconfig2
-rw-r--r--drivers/net/irda/sa1100_ir.c953
-rw-r--r--include/linux/sa11x0-dma.h24
7 files changed, 1700 insertions, 423 deletions
diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c
index 2b33b459746..1752686e9ab 100644
--- a/arch/arm/mach-sa1100/generic.c
+++ b/arch/arm/mach-sa1100/generic.c
@@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
+#include <linux/dma-mapping.h>
#include <linux/pm.h>
#include <linux/cpufreq.h>
#include <linux/ioport.h>
@@ -289,6 +290,29 @@ static struct platform_device sa11x0rtc_device = {
.id = -1,
};
+static struct resource sa11x0dma_resources[] = {
+ DEFINE_RES_MEM(__PREG(DDAR(0)), 6 * DMASp),
+ DEFINE_RES_IRQ(IRQ_DMA0),
+ DEFINE_RES_IRQ(IRQ_DMA1),
+ DEFINE_RES_IRQ(IRQ_DMA2),
+ DEFINE_RES_IRQ(IRQ_DMA3),
+ DEFINE_RES_IRQ(IRQ_DMA4),
+ DEFINE_RES_IRQ(IRQ_DMA5),
+};
+
+static u64 sa11x0dma_dma_mask = DMA_BIT_MASK(32);
+
+static struct platform_device sa11x0dma_device = {
+ .name = "sa11x0-dma",
+ .id = -1,
+ .dev = {
+ .dma_mask = &sa11x0dma_dma_mask,
+ .coherent_dma_mask = 0xffffffff,
+ },
+ .num_resources = ARRAY_SIZE(sa11x0dma_resources),
+ .resource = sa11x0dma_resources,
+};
+
static struct platform_device *sa11x0_devices[] __initdata = {
&sa11x0udc_device,
&sa11x0uart1_device,
@@ -297,6 +321,7 @@ static struct platform_device *sa11x0_devices[] __initdata = {
&sa11x0pcmcia_device,
&sa11x0fb_device,
&sa11x0rtc_device,
+ &sa11x0dma_device,
};
static int __init sa1100_init(void)
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index f1a274994bb..4a6c46dea8a 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -252,6 +252,15 @@ config EP93XX_DMA
help
Enable support for the Cirrus Logic EP93xx M2P/M2M DMA controller.
+config DMA_SA11X0
+ tristate "SA-11x0 DMA support"
+ depends on ARCH_SA1100
+ select DMA_ENGINE
+ help
+ Support the DMA engine found on Intel StrongARM SA-1100 and
+ SA-1110 SoCs. This DMA engine can only be used with on-chip
+ devices.
+
config DMA_ENGINE
bool
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 009a222e828..86b795baba9 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -27,3 +27,4 @@ obj-$(CONFIG_PL330_DMA) += pl330.o
obj-$(CONFIG_PCH_DMA) += pch_dma.o
obj-$(CONFIG_AMBA_PL08X) += amba-pl08x.o
obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
+obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o
diff --git a/drivers/dma/sa11x0-dma.c b/drivers/dma/sa11x0-dma.c
new file mode 100644
index 00000000000..16a6b48883c
--- /dev/null
+++ b/drivers/dma/sa11x0-dma.c
@@ -0,0 +1,1109 @@
+/*
+ * SA11x0 DMAengine support
+ *
+ * Copyright (C) 2012 Russell King
+ * Derived in part from arch/arm/mach-sa1100/dma.c,
+ * Copyright (C) 2000, 2001 by Nicolas Pitre
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/sa11x0-dma.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#define NR_PHY_CHAN 6
+#define DMA_ALIGN 3
+#define DMA_MAX_SIZE 0x1fff
+#define DMA_CHUNK_SIZE 0x1000
+
+#define DMA_DDAR 0x00
+#define DMA_DCSR_S 0x04
+#define DMA_DCSR_C 0x08
+#define DMA_DCSR_R 0x0c
+#define DMA_DBSA 0x10
+#define DMA_DBTA 0x14
+#define DMA_DBSB 0x18
+#define DMA_DBTB 0x1c
+#define DMA_SIZE 0x20
+
+#define DCSR_RUN (1 << 0)
+#define DCSR_IE (1 << 1)
+#define DCSR_ERROR (1 << 2)
+#define DCSR_DONEA (1 << 3)
+#define DCSR_STRTA (1 << 4)
+#define DCSR_DONEB (1 << 5)
+#define DCSR_STRTB (1 << 6)
+#define DCSR_BIU (1 << 7)
+
+#define DDAR_RW (1 << 0) /* 0 = W, 1 = R */
+#define DDAR_E (1 << 1) /* 0 = LE, 1 = BE */
+#define DDAR_BS (1 << 2) /* 0 = BS4, 1 = BS8 */
+#define DDAR_DW (1 << 3) /* 0 = 8b, 1 = 16b */
+#define DDAR_Ser0UDCTr (0x0 << 4)
+#define DDAR_Ser0UDCRc (0x1 << 4)
+#define DDAR_Ser1SDLCTr (0x2 << 4)
+#define DDAR_Ser1SDLCRc (0x3 << 4)
+#define DDAR_Ser1UARTTr (0x4 << 4)
+#define DDAR_Ser1UARTRc (0x5 << 4)
+#define DDAR_Ser2ICPTr (0x6 << 4)
+#define DDAR_Ser2ICPRc (0x7 << 4)
+#define DDAR_Ser3UARTTr (0x8 << 4)
+#define DDAR_Ser3UARTRc (0x9 << 4)
+#define DDAR_Ser4MCP0Tr (0xa << 4)
+#define DDAR_Ser4MCP0Rc (0xb << 4)
+#define DDAR_Ser4MCP1Tr (0xc << 4)
+#define DDAR_Ser4MCP1Rc (0xd << 4)
+#define DDAR_Ser4SSPTr (0xe << 4)
+#define DDAR_Ser4SSPRc (0xf << 4)
+
+struct sa11x0_dma_sg {
+ u32 addr;
+ u32 len;
+};
+
+struct sa11x0_dma_desc {
+ struct dma_async_tx_descriptor tx;
+ u32 ddar;
+ size_t size;
+
+ /* maybe protected by c->lock */
+ struct list_head node;
+ unsigned sglen;
+ struct sa11x0_dma_sg sg[0];
+};
+
+struct sa11x0_dma_phy;
+
+struct sa11x0_dma_chan {
+ struct dma_chan chan;
+ spinlock_t lock;
+ dma_cookie_t lc;
+
+ /* protected by c->lock */
+ struct sa11x0_dma_phy *phy;
+ enum dma_status status;
+ struct list_head desc_submitted;
+ struct list_head desc_issued;
+
+ /* protected by d->lock */
+ struct list_head node;
+
+ u32 ddar;
+ const char *name;
+};
+
+struct sa11x0_dma_phy {
+ void __iomem *base;
+ struct sa11x0_dma_dev *dev;
+ unsigned num;
+
+ struct sa11x0_dma_chan *vchan;
+
+ /* Protected by c->lock */
+ unsigned sg_load;
+ struct sa11x0_dma_desc *txd_load;
+ unsigned sg_done;
+ struct sa11x0_dma_desc *txd_done;
+#ifdef CONFIG_PM_SLEEP
+ u32 dbs[2];
+ u32 dbt[2];
+ u32 dcsr;
+#endif
+};
+
+struct sa11x0_dma_dev {
+ struct dma_device slave;
+ void __iomem *base;
+ spinlock_t lock;
+ struct tasklet_struct task;
+ struct list_head chan_pending;
+ struct list_head desc_complete;
+ struct sa11x0_dma_phy phy[NR_PHY_CHAN];
+};
+
+static struct sa11x0_dma_chan *to_sa11x0_dma_chan(struct dma_chan *chan)
+{
+ return container_of(chan, struct sa11x0_dma_chan, chan);
+}
+
+static struct sa11x0_dma_dev *to_sa11x0_dma(struct dma_device *dmadev)
+{
+ return container_of(dmadev, struct sa11x0_dma_dev, slave);
+}
+
+static struct sa11x0_dma_desc *to_sa11x0_dma_tx(struct dma_async_tx_descriptor *tx)
+{
+ return container_of(tx, struct sa11x0_dma_desc, tx);
+}
+
+static struct sa11x0_dma_desc *sa11x0_dma_next_desc(struct sa11x0_dma_chan *c)
+{
+ if (list_empty(&c->desc_issued))
+ return NULL;
+
+ return list_first_entry(&c->desc_issued, struct sa11x0_dma_desc, node);
+}
+
+static void sa11x0_dma_start_desc(struct sa11x0_dma_phy *p, struct sa11x0_dma_desc *txd)
+{
+ list_del(&txd->node);
+ p->txd_load = txd;
+ p->sg_load = 0;
+
+ dev_vdbg(p->dev->slave.dev, "pchan %u: txd %p[%x]: starting: DDAR:%x\n",
+ p->num, txd, txd->tx.cookie, txd->ddar);
+}
+
+static void noinline sa11x0_dma_start_sg(struct sa11x0_dma_phy *p,
+ struct sa11x0_dma_chan *c)
+{
+ struct sa11x0_dma_desc *txd = p->txd_load;
+ struct sa11x0_dma_sg *sg;
+ void __iomem *base = p->base;
+ unsigned dbsx, dbtx;
+ u32 dcsr;
+
+ if (!txd)
+ return;
+
+ dcsr = readl_relaxed(base + DMA_DCSR_R);
+
+ /* Don't try to load the next transfer if both buffers are started */
+ if ((dcsr & (DCSR_STRTA | DCSR_STRTB)) == (DCSR_STRTA | DCSR_STRTB))
+ return;
+
+ if (p->sg_load == txd->sglen) {
+ struct sa11x0_dma_desc *txn = sa11x0_dma_next_desc(c);
+
+ /*
+ * We have reached the end of the current descriptor.
+ * Peek at the next descriptor, and if compatible with
+ * the current, start processing it.
+ */
+ if (txn && txn->ddar == txd->ddar) {
+ txd = txn;
+ sa11x0_dma_start_desc(p, txn);
+ } else {
+ p->txd_load = NULL;
+ return;
+ }
+ }
+
+ sg = &txd->sg[p->sg_load++];
+
+ /* Select buffer to load according to channel status */
+ if (((dcsr & (DCSR_BIU | DCSR_STRTB)) == (DCSR_BIU | DCSR_STRTB)) ||
+ ((dcsr & (DCSR_BIU | DCSR_STRTA)) == 0)) {
+ dbsx = DMA_DBSA;
+ dbtx = DMA_DBTA;
+ dcsr = DCSR_STRTA | DCSR_IE | DCSR_RUN;
+ } else {
+ dbsx = DMA_DBSB;
+ dbtx = DMA_DBTB;
+ dcsr = DCSR_STRTB | DCSR_IE | DCSR_RUN;
+ }
+
+ writel_relaxed(sg->addr, base + dbsx);
+ writel_relaxed(sg->len, base + dbtx);
+ writel(dcsr, base + DMA_DCSR_S);
+
+ dev_dbg(p->dev->slave.dev, "pchan %u: load: DCSR:%02x DBS%c:%08x DBT%c:%08x\n",
+ p->num, dcsr,
+ 'A' + (dbsx == DMA_DBSB), sg->addr,
+ 'A' + (dbtx == DMA_DBTB), sg->len);
+}
+
+static void noinline sa11x0_dma_complete(struct sa11x0_dma_phy *p,
+ struct sa11x0_dma_chan *c)
+{
+ struct sa11x0_dma_desc *txd = p->txd_done;
+
+ if (++p->sg_done == txd->sglen) {
+ struct sa11x0_dma_dev *d = p->dev;
+
+ dev_vdbg(d->slave.dev, "pchan %u: txd %p[%x]: completed\n",
+ p->num, p->txd_done, p->txd_done->tx.cookie);
+
+ c->lc = txd->tx.cookie;
+
+ spin_lock(&d->lock);
+ list_add_tail(&txd->node, &d->desc_complete);
+ spin_unlock(&d->lock);
+
+ p->sg_done = 0;
+ p->txd_done = p->txd_load;
+
+ tasklet_schedule(&d->task);
+ }
+
+ sa11x0_dma_start_sg(p, c);
+}
+
+static irqreturn_t sa11x0_dma_irq(int irq, void *dev_id)
+{
+ struct sa11x0_dma_phy *p = dev_id;
+ struct sa11x0_dma_dev *d = p->dev;
+ struct sa11x0_dma_chan *c;
+ u32 dcsr;
+
+ dcsr = readl_relaxed(p->base + DMA_DCSR_R);
+ if (!(dcsr & (DCSR_ERROR | DCSR_DONEA | DCSR_DONEB)))
+ return IRQ_NONE;
+
+ /* Clear reported status bits */
+ writel_relaxed(dcsr & (DCSR_ERROR | DCSR_DONEA | DCSR_DONEB),
+ p->base + DMA_DCSR_C);
+
+ dev_dbg(d->slave.dev, "pchan %u: irq: DCSR:%02x\n", p->num, dcsr);
+
+ if (dcsr & DCSR_ERROR) {
+ dev_err(d->slave.dev, "pchan %u: error. DCSR:%02x DDAR:%08x DBSA:%08x DBTA:%08x DBSB:%08x DBTB:%08x\n",
+ p->num, dcsr,
+ readl_relaxed(p->base + DMA_DDAR),
+ readl_relaxed(p->base + DMA_DBSA),
+ readl_relaxed(p->base + DMA_DBTA),
+ readl_relaxed(p->base + DMA_DBSB),
+ readl_relaxed(p->base + DMA_DBTB));
+ }
+
+ c = p->vchan;
+ if (c) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&c->lock, flags);
+ /*
+ * Now that we're holding the lock, check that the vchan
+ * really is associated with this pchan before touching the
+ * hardware. This should always succeed, because we won't
+ * change p->vchan or c->phy while the channel is actively
+ * transferring.
+ */
+ if (c->phy == p) {
+ if (dcsr & DCSR_DONEA)
+ sa11x0_dma_complete(p, c);
+ if (dcsr & DCSR_DONEB)
+ sa11x0_dma_complete(p, c);
+ }
+ spin_unlock_irqrestore(&c->lock, flags);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void sa11x0_dma_start_txd(struct sa11x0_dma_chan *c)
+{
+ struct sa11x0_dma_desc *txd = sa11x0_dma_next_desc(c);
+
+ /* If the issued list is empty, we have no further txds to process */
+ if (txd) {
+ struct sa11x0_dma_phy *p = c->phy;
+
+ sa11x0_dma_start_desc(p, txd);
+ p->txd_done = txd;
+ p->sg_done = 0;
+
+ /* The channel should not have any transfers started */
+ WARN_ON(readl_relaxed(p->base + DMA_DCSR_R) &
+ (DCSR_STRTA | DCSR_STRTB));
+
+ /* Clear the run and start bits before changing DDAR */
+ writel_relaxed(DCSR_RUN | DCSR_STRTA | DCSR_STRTB,
+ p->base + DMA_DCSR_C);
+ writel_relaxed(txd->ddar, p->base + DMA_DDAR);
+
+ /* Try to start both buffers */
+ sa11x0_dma_start_sg(p, c);
+ sa11x0_dma_start_sg(p, c);
+ }
+}
+
+static void sa11x0_dma_tasklet(unsigned long arg)
+{
+ struct sa11x0_dma_dev *d = (struct sa11x0_dma_dev *)arg;
+ struct sa11x0_dma_phy *p;
+ struct sa11x0_dma_chan *c;
+ struct sa11x0_dma_desc *txd, *txn;
+ LIST_HEAD(head);
+ unsigned pch, pch_alloc = 0;
+
+ dev_dbg(d->slave.dev, "tasklet enter\n");
+
+ /* Get the completed tx descriptors */
+ spin_lock_irq(&d->lock);
+ list_splice_init(&d->desc_complete, &head);
+ spin_unlock_irq(&d->lock);
+
+ list_for_each_entry(txd, &head, node) {
+ c = to_sa11x0_dma_chan(txd->tx.chan);
+
+ dev_dbg(d->slave.dev, "vchan %p: txd %p[%x] completed\n",
+ c, txd, txd->tx.cookie);
+
+ spin_lock_irq(&c->lock);
+ p = c->phy;
+ if (p) {
+ if (!p->txd_done)
+ sa11x0_dma_start_txd(c);
+ if (!p->txd_done) {
+ /* No current txd associated with this channel */
+ dev_dbg(d->slave.dev, "pchan %u: free\n", p->num);
+
+ /* Mark this channel free */
+ c->phy = NULL;
+ p->vchan = NULL;
+ }
+ }
+ spin_unlock_irq(&c->lock);
+ }
+
+ spin_lock_irq(&d->lock);
+ for (pch = 0; pch < NR_PHY_CHAN; pch++) {
+ p = &d->phy[pch];
+
+ if (p->vchan == NULL && !list_empty(&d->chan_pending)) {
+ c = list_first_entry(&d->chan_pending,
+ struct sa11x0_dma_chan, node);
+ list_del_init(&c->node);
+
+ pch_alloc |= 1 << pch;
+
+ /* Mark this channel allocated */
+ p->vchan = c;
+
+ dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, c);
+ }
+ }
+ spin_unlock_irq(&d->lock);
+
+ for (pch = 0; pch < NR_PHY_CHAN; pch++) {
+ if (pch_alloc & (1 << pch)) {
+ p = &d->phy[pch];
+ c = p->vchan;
+
+ spin_lock_irq(&c->lock);
+ c->phy = p;
+
+ sa11x0_dma_start_txd(c);
+ spin_unlock_irq(&c->lock);
+ }
+ }
+
+ /* Now free the completed tx descriptor, and call their callbacks */
+ list_for_each_entry_safe(txd, txn, &head, node) {
+ dma_async_tx_callback callback = txd->tx.callback;
+ void *callback_param = txd->tx.callback_param;
+
+ dev_dbg(d->slave.dev, "txd %p[%x]: callback and free\n",
+ txd, txd->tx.cookie);
+
+ kfree(txd);
+
+ if (callback)
+ callback(callback_param);
+ }
+
+ dev_dbg(d->slave.dev, "tasklet exit\n");
+}
+
+
+static void sa11x0_dma_desc_free(struct sa11x0_dma_dev *d, struct list_head *head)
+{
+ struct sa11x0_dma_desc *txd, *txn;
+
+ list_for_each_entry_safe(txd, txn, head, node) {
+ dev_dbg(d->slave.dev, "txd %p: freeing\n", txd);
+ kfree(txd);
+ }
+}
+
+static int sa11x0_dma_alloc_chan_resources(struct dma_chan *chan)
+{
+ return 0;
+}
+
+static void sa11x0_dma_free_chan_resources(struct dma_chan *chan)
+{
+ struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
+ struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
+ unsigned long flags;
+ LIST_HEAD(head);
+
+ spin_lock_irqsave(&c->lock, flags);
+ spin_lock(&d->lock);
+ list_del_init(&c->node);
+ spin_unlock(&d->lock);
+
+ list_splice_tail_init(&c->desc_submitted, &head);
+ list_splice_tail_init(&c->desc_issued, &head);
+ spin_unlock_irqrestore(&c->lock, flags);
+
+ sa11x0_dma_desc_free(d, &head);
+}
+
+static dma_addr_t sa11x0_dma_pos(struct sa11x0_dma_phy *p)
+{
+ unsigned reg;
+ u32 dcsr;
+
+ dcsr = readl_relaxed(p->base + DMA_DCSR_R);
+
+ if ((dcsr & (DCSR_BIU | DCSR_STRTA)) == DCSR_STRTA ||
+ (dcsr & (DCSR_BIU | DCSR_STRTB)) == DCSR_BIU)
+ reg = DMA_DBSA;
+ else
+ reg = DMA_DBSB;
+
+ return readl_relaxed(p->base + reg);
+}
+
+static enum dma_status sa11x0_dma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie, struct dma_tx_state *state)
+{
+ struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
+ struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
+ struct sa11x0_dma_phy *p;
+ struct sa11x0_dma_desc *txd;
+ dma_cookie_t last_used, last_complete;
+ unsigned long flags;
+ enum dma_status ret;
+ size_t bytes = 0;
+
+ last_used = c->chan.cookie;
+ last_complete = c->lc;
+
+ ret = dma_async_is_complete(cookie, last_complete, last_used);
+ if (ret == DMA_SUCCESS) {
+ dma_set_tx_state(state, last_complete, last_used, 0);
+ return ret;
+ }
+
+ spin_lock_irqsave(&c->lock, flags);
+ p = c->phy;
+ ret = c->status;
+ if (p) {
+ dma_addr_t addr = sa11x0_dma_pos(p);
+
+ dev_vdbg(d->slave.dev, "tx_status: addr:%x\n", addr);
+
+ txd = p->txd_done;
+ if (txd) {
+ unsigned i;
+
+ for (i = 0; i < txd->sglen; i++) {
+ dev_vdbg(d->slave.dev, "tx_status: [%u] %x+%x\n",
+ i, txd->sg[i].addr, txd->sg[i].len);
+ if (addr >= txd->sg[i].addr &&
+ addr < txd->sg[i].addr + txd->sg[i].len) {
+ unsigned len;
+
+ len = txd->sg[i].len -
+ (addr - txd->sg[i].addr);
+ dev_vdbg(d->slave.dev, "tx_status: [%u] +%x\n",
+ i, len);
+ bytes += len;
+ i++;
+ break;
+ }
+ }
+ for (; i < txd->sglen; i++) {
+ dev_vdbg(d->slave.dev, "tx_status: [%u] %x+%x ++\n",
+ i, txd->sg[i].addr, txd->sg[i].len);
+ bytes += txd->sg[i].len;
+ }
+ }
+ if (txd != p->txd_load && p->txd_load)
+ bytes += p->txd_load->size;
+ }
+ list_for_each_entry(txd, &c->desc_issued, node) {
+ bytes += txd->size;
+ }
+ spin_unlock_irqrestore(&c->lock, flags);
+
+ dma_set_tx_state(state, last_complete, last_used, bytes);
+
+ dev_vdbg(d->slave.dev, "tx_status: bytes 0x%zx\n", bytes);
+
+ return ret;
+}
+
+/*
+ * Move pending txds to the issued list, and re-init pending list.
+ * If not already pending, add this channel to the list of pending
+ * channels and trigger the tasklet to run.
+ */
+static void sa11x0_dma_issue_pending(struct dma_chan *chan)
+{
+ struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
+ struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
+ unsigned long flags;
+
+ spin_lock_irqsave(&c->lock, flags);
+ list_splice_tail_init(&c->desc_submitted, &c->desc_issued);
+ if (!list_empty(&c->desc_issued)) {
+ spin_lock(&d->lock);
+ if (!c->phy && list_empty(&c->node)) {
+ list_add_tail(&c->node, &d->chan_pending);
+ tasklet_schedule(&d->task);
+ dev_dbg(d->slave.dev, "vchan %p: issued\n", c);
+ }
+ spin_unlock(&d->lock);
+ } else
+ dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", c);
+ spin_unlock_irqrestore(&c->lock, flags);
+}
+
+static dma_cookie_t sa11x0_dma_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(tx->chan);
+ struct sa11x0_dma_desc *txd = to_sa11x0_dma_tx(tx);
+ unsigned long flags;
+
+ spin_lock_irqsave(&c->lock, flags);
+ c->chan.cookie += 1;
+ if (c->chan.cookie < 0)
+ c->chan.cookie = 1;
+ txd->tx.cookie = c->chan.cookie;
+
+ list_add_tail(&txd->node, &c->desc_submitted);
+ spin_unlock_irqrestore(&c->lock, flags);
+
+ dev_dbg(tx->chan->device->dev, "vchan %p: txd %p[%x]: submitted\n",
+ c, txd, txd->tx.cookie);
+
+ return txd->tx.cookie;
+}
+
+static struct dma_async_tx_descriptor *sa11x0_dma_prep_slave_sg(
+ struct dma_chan *chan, struct scatterlist *sg, unsigned int sglen,
+ enum dma_transfer_direction dir, unsigned long flags)
+{
+ struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
+ struct sa11x0_dma_desc *txd;
+ struct scatterlist *sgent;
+ unsigned i, j = sglen;
+ size_t size = 0;
+
+ /* SA11x0 channels can only operate in their native direction */
+ if (dir != (c->ddar & DDAR_RW ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV)) {
+ dev_err(chan->device->dev, "vchan %p: bad DMA direction: DDAR:%08x dir:%u\n",
+ c, c->ddar, dir);
+ return NULL;
+ }
+
+ /* Do not allow zero-sized txds */
+ if (sglen == 0)
+ return NULL;
+
+ for_each_sg(sg, sgent, sglen, i) {
+ dma_addr_t addr = sg_dma_address(sgent);
+ unsigned int len = sg_dma_len(sgent);
+
+ if (len > DMA_MAX_SIZE)
+ j += DIV_ROUND_UP(len, DMA_MAX_SIZE & ~DMA_ALIGN) - 1;
+ if (addr & DMA_ALIGN) {
+ dev_dbg(chan->device->dev, "vchan %p: bad buffer alignment: %08x\n",
+ c, addr);
+ return NULL;
+ }
+ }
+
+ txd = kzalloc(sizeof(*txd) + j * sizeof(txd->sg[0]), GFP_ATOMIC);
+ if (!txd) {
+ dev_dbg(chan->device->dev, "vchan %p: kzalloc failed\n", c);
+ return NULL;
+ }
+
+ j = 0;
+ for_each_sg(sg, sgent, sglen, i) {
+ dma_addr_t addr = sg_dma_address(sgent);
+ unsigned len = sg_dma_len(sgent);
+
+ size += len;
+
+ do {
+ unsigned tlen = len;
+
+ /*
+ * Check whether the transfer will fit. If not, try
+ * to split the transfer up such that we end up with
+ * equal chunks - but make sure that we preserve the
+ * alignment. This avoids small segments.
+ */
+ if (tlen > DMA_MAX_SIZE) {
+ unsigned mult = DIV_ROUND_UP(tlen,
+ DMA_MAX_SIZE & ~DMA_ALIGN);
+
+ tlen = (tlen / mult) & ~DMA_ALIGN;
+ }
+
+ txd->sg[j].addr = addr;
+ txd->sg[j].len = tlen;
+
+ addr += tlen;
+ len -= tlen;
+ j++;
+ } while (len);
+ }
+
+ dma_async_tx_descriptor_init(&txd->tx, &c->chan);
+ txd->tx.flags = flags;
+ txd->tx.tx_submit = sa11x0_dma_tx_submit;
+ txd->ddar = c->ddar;
+ txd->size = size;
+ txd->sglen = j;
+
+ dev_dbg(chan->device->dev, "vchan %p: txd %p: size %u nr %u\n",
+ c, txd, txd->size, txd->sglen);
+
+ return &txd->tx;
+}
+
+static int sa11x0_dma_slave_config(struct sa11x0_dma_chan *c, struct dma_slave_config *cfg)
+{
+ u32 ddar = c->ddar & ((0xf << 4) | DDAR_RW);
+ dma_addr_t addr;
+ enum dma_slave_buswidth width;
+ u32 maxburst;
+
+ if (ddar & DDAR_RW) {
+ addr = cfg->src_addr;
+ width = cfg->src_addr_width;
+ maxburst = cfg->src_maxburst;
+ } else {
+ addr = cfg->dst_addr;
+ width = cfg->dst_addr_width;
+ maxburst = cfg->dst_maxburst;
+ }
+
+ if ((width != DMA_SLAVE_BUSWIDTH_1_BYTE &&
+ width != DMA_SLAVE_BUSWIDTH_2_BYTES) ||
+ (maxburst != 4 && maxburst != 8))
+ return -EINVAL;
+
+ if (width == DMA_SLAVE_BUSWIDTH_2_BYTES)
+ ddar |= DDAR_DW;
+ if (maxburst == 8)
+ ddar |= DDAR_BS;
+
+ dev_dbg(c->chan.device->dev, "vchan %p: dma_slave_config addr %x width %u burst %u\n",
+ c, addr, width, maxburst);
+
+ c->ddar = ddar | (addr & 0xf0000000) | (addr & 0x003ffffc) << 6;
+
+ return 0;
+}
+
+static int sa11x0_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
+ struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device);
+ struct sa11x0_dma_phy *p;
+ LIST_HEAD(head);
+ unsigned long flags;
+ int ret;
+
+ switch (cmd) {
+ case DMA_SLAVE_CONFIG:
+ return sa11x0_dma_slave_config(c, (struct dma_slave_config *)arg);
+
+ case DMA_TERMINATE_ALL:
+ dev_dbg(d->slave.dev, "vchan %p: terminate all\n", c);
+ /* Clear the tx descriptor lists */
+ spin_lock_irqsave(&c->lock, flags);
+ list_splice_tail_init(&c->desc_submitted, &head);
+ list_splice_tail_init(&c->desc_issued, &head);
+
+ p = c->phy;
+ if (p) {
+ struct sa11x0_dma_desc *txd, *txn;
+
+ dev_dbg(d->slave.dev, "pchan %u: terminating\n", p->num);
+ /* vchan is assigned to a pchan - stop the channel */
+ writel(DCSR_RUN | DCSR_IE |
+ DCSR_STRTA | DCSR_DONEA |
+ DCSR_STRTB | DCSR_DONEB,
+ p->base + DMA_DCSR_C);
+
+ list_for_each_entry_safe(txd, txn, &d->desc_complete, node)
+ if (txd->tx.chan == &c->chan)
+ list_move(&txd->node, &head);
+
+ if (p->txd_load) {
+ if (p->txd_load != p->txd_done)
+ list_add_tail(&p->txd_load->node, &head);
+ p->txd_load = NULL;
+ }
+ if (p->txd_done) {
+ list_add_tail(&p->txd_done->node, &head);
+ p->txd_done = NULL;
+ }
+ c->phy = NULL;
+ spin_lock(&d->lock);
+ p->vchan = NULL;
+ spin_unlock(&d->lock);
+ tasklet_schedule(&d->task);
+ }
+ spin_unlock_irqrestore(&c->lock, flags);
+ sa11x0_dma_desc_free(d, &head);
+ ret = 0;
+ break;
+
+ case DMA_PAUSE:
+ dev_dbg(d->slave.dev, "vchan %p: pause\n", c);
+ spin_lock_irqsave(&c->lock, flags);
+ if (c->status == DMA_IN_PROGRESS) {
+ c->status = DMA_PAUSED;
+
+ p = c->phy;
+ if (p) {
+ writel(DCSR_RUN | DCSR_IE, p->base + DMA_DCSR_C);
+ } else {
+ spin_lock(&d->lock);
+ list_del_init(&c->node);
+ spin_unlock(&d->lock);
+ }
+ }
+ spin_unlock_irqrestore(&c->lock, flags);
+ ret = 0;
+ break;
+
+ case DMA_RESUME:
+ dev_dbg(d->slave.dev, "vchan %p: resume\n", c);
+ spin_lock_irqsave(&c->lock, flags);
+ if (c->status == DMA_PAUSED) {
+ c->status = DMA_IN_PROGRESS;
+
+ p = c->phy;
+ if (p) {
+ writel(DCSR_RUN | DCSR_IE, p->base + DMA_DCSR_S);
+ } else if (!list_empty(&c->desc_issued)) {
+ spin_lock(&d->lock);
+ list_add_tail(&c->node, &d->chan_pending);
+ spin_unlock(&d->lock);
+ }
+ }
+ spin_unlock_irqrestore(&c->lock, flags);
+ ret = 0;
+ break;
+
+ default:
+ ret = -ENXIO;
+ break;
+ }
+
+ return ret;
+}
+
+struct sa11x0_dma_channel_desc {
+ u32 ddar;
+ const char *name;
+};
+
+#define CD(d1, d2) { .ddar = DDAR_##d1 | d2, .name = #d1 }
+static const struct sa11x0_dma_channel_desc chan_desc[] = {
+ CD(Ser0UDCTr, 0),
+ CD(Ser0UDCRc, DDAR_RW),
+ CD(Ser1SDLCTr, 0),
+ CD(Ser1SDLCRc, DDAR_RW),
+ CD(Ser1UARTTr, 0),
+ CD(Ser1UARTRc, DDAR_RW),
+ CD(Ser2ICPTr, 0),
+ CD(Ser2ICPRc, DDAR_RW),
+ CD(Ser3UARTTr, 0),
+ CD(Ser3UARTRc, DDAR_RW),
+ CD(Ser4MCP0Tr, 0),
+ CD(Ser4MCP0Rc, DDAR_RW),
+ CD(Ser4MCP1Tr, 0),
+ CD(Ser4MCP1Rc, DDAR_RW),
+ CD(Ser4SSPTr, 0),
+ CD(Ser4SSPRc, DDAR_RW),
+};
+
+static int __devinit sa11x0_dma_init_dmadev(struct dma_device *dmadev,
+ struct device *dev)
+{
+ unsigned i;
+
+ dmadev->chancnt = ARRAY_SIZE(chan_desc);
+ INIT_LIST_HEAD(&dmadev->channels);
+ dmadev->dev = dev;
+ dmadev->device_alloc_chan_resources = sa11x0_dma_alloc_chan_resources;
+ dmadev->device_free_chan_resources = sa11x0_dma_free_chan_resources;
+ dmadev->device_control = sa11x0_dma_control;
+ dmadev->device_tx_status = sa11x0_dma_tx_status;
+ dmadev->device_issue_pending = sa11x0_dma_issue_pending;
+
+ for (i = 0; i < dmadev->chancnt; i++) {
+ struct sa11x0_dma_chan *c;
+
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
+ if (!c) {
+ dev_err(dev, "no memory for channel %u\n", i);
+ return -ENOMEM;
+ }
+
+ c->chan.device = dmadev;
+ c->status = DMA_IN_PROGRESS;
+ c->ddar = chan_desc[i].ddar;
+ c->name = chan_desc[i].name;
+ spin_lock_init(&c->lock);
+ INIT_LIST_HEAD(&c->desc_submitted);
+ INIT_LIST_HEAD(&c->desc_issued);
+ INIT_LIST_HEAD(&c->node);
+ list_add_tail(&c->chan.device_node, &dmadev->channels);
+ }
+
+ return dma_async_device_register(dmadev);
+}
+
+static int sa11x0_dma_request_irq(struct platform_device *pdev, int nr,
+ void *data)
+{
+ int irq = platform_get_irq(pdev, nr);
+
+ if (irq <= 0)
+ return -ENXIO;
+
+ return request_irq(irq, sa11x0_dma_irq, 0, dev_name(&pdev->dev), data);
+}
+
+static void sa11x0_dma_free_irq(struct platform_device *pdev, int nr,
+ void *data)
+{
+ int irq = platform_get_irq(pdev, nr);
+ if (irq > 0)
+ free_irq(irq, data);
+}
+
+static void sa11x0_dma_free_channels(struct dma_device *dmadev)
+{
+ struct sa11x0_dma_chan *c, *cn;
+
+ list_for_each_entry_safe(c, cn, &dmadev->channels, chan.device_node) {
+ list_del(&c->chan.device_node);
+ kfree(c);
+ }
+}
+
+static int __devinit sa11x0_dma_probe(struct platform_device *pdev)
+{
+ struct sa11x0_dma_dev *d;
+ struct resource *res;
+ unsigned i;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENXIO;
+
+ d = kzalloc(sizeof(*d), GFP_KERNEL);
+ if (!d) {
+ ret = -ENOMEM;
+ goto err_alloc;
+ }
+
+ spin_lock_init(&d->lock);
+ INIT_LIST_HEAD(&d->chan_pending);
+ INIT_LIST_HEAD(&d->desc_complete);
+
+ d->base = ioremap(res->start, resource_size(res));
+ if (!d->base) {
+ ret = -ENOMEM;
+ goto err_ioremap;
+ }
+
+ tasklet_init(&d->task, sa11x0_dma_tasklet, (unsigned long)d);
+
+ for (i = 0; i < NR_PHY_CHAN; i++) {
+ struct sa11x0_dma_phy *p = &d->phy[i];
+
+ p->dev = d;
+ p->num = i;
+ p->base = d->base + i * DMA_SIZE;
+ writel_relaxed(DCSR_RUN | DCSR_IE | DCSR_ERROR |
+ DCSR_DONEA | DCSR_STRTA | DCSR_DONEB | DCSR_STRTB,
+ p->base + DMA_DCSR_C);
+ writel_relaxed(0, p->base + DMA_DDAR);
+
+ ret = sa11x0_dma_request_irq(pdev, i, p);
+ if (ret) {
+ while (i) {
+ i--;
+ sa11x0_dma_free_irq(pdev, i, &d->phy[i]);
+ }
+ goto err_irq;
+ }
+ }
+
+ dma_cap_set(DMA_SLAVE, d->slave.cap_mask);
+ d->slave.device_prep_slave_sg = sa11x0_dma_prep_slave_sg;
+ ret = sa11x0_dma_init_dmadev(&d->slave, &pdev->dev);
+ if (ret) {
+ dev_warn(d->slave.dev, "failed to register slave async device: %d\n",
+ ret);
+ goto err_slave_reg;
+ }
+
+ platform_set_drvdata(pdev, d);
+ return 0;
+
+ err_slave_reg:
+ sa11x0_dma_free_channels(&d->slave);
+ for (i = 0; i < NR_PHY_CHAN; i++)
+ sa11x0_dma_free_irq(pdev, i, &d->phy[i]);
+ err_irq:
+ tasklet_kill(&d->task);
+ iounmap(d->base);
+ err_ioremap:
+ kfree(d);
+ err_alloc:
+ return ret;
+}
+
+static int __devexit sa11x0_dma_remove(struct platform_device *pdev)
+{
+ struct sa11x0_dma_dev *d = platform_get_drvdata(pdev);
+ unsigned pch;
+
+ dma_async_device_unregister(&d->slave);
+
+ sa11x0_dma_free_channels(&d->slave);
+ for (pch = 0; pch < NR_PHY_CHAN; pch++)
+ sa11x0_dma_free_irq(pdev, pch, &d->phy[pch]);
+ tasklet_kill(&d->task);
+ iounmap(d->base);
+ kfree(d);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int sa11x0_dma_suspend(struct device *dev)
+{
+ struct sa11x0_dma_dev *d = dev_get_drvdata(dev);
+ unsigned pch;
+
+ for (pch = 0; pch < NR_PHY_CHAN; pch++) {
+ struct sa11x0_dma_phy *p = &d->phy[pch];
+ u32 dcsr, saved_dcsr;
+
+ dcsr = saved_dcsr = readl_relaxed(p->base + DMA_DCSR_R);
+ if (dcsr & DCSR_RUN) {
+ writel(DCSR_RUN | DCSR_IE, p->base + DMA_DCSR_C);
+ dcsr = readl_relaxed(p->base + DMA_DCSR_R);
+ }
+
+ saved_dcsr &= DCSR_RUN | DCSR_IE;
+ if (dcsr & DCSR_BIU) {
+ p->dbs[0] = readl_relaxed(p->base + DMA_DBSB);
+ p->dbt[0] = readl_relaxed(p->base + DMA_DBTB);
+ p->dbs[1] = readl_relaxed(p->base + DMA_DBSA);
+ p->dbt[1] = readl_relaxed(p->base + DMA_DBTA);
+ saved_dcsr |= (dcsr & DCSR_STRTA ? DCSR_STRTB : 0) |
+ (dcsr & DCSR_STRTB ? DCSR_STRTA : 0);
+ } else {
+ p->dbs[0] = readl_relaxed(p->base + DMA_DBSA);
+ p->dbt[0] = readl_relaxed(p->base + DMA_DBTA);
+ p->dbs[1] = readl_relaxed(p->base + DMA_DBSB);
+ p->dbt[1] = readl_relaxed(p->base + DMA_DBTB);
+ saved_dcsr |= dcsr & (DCSR_STRTA | DCSR_STRTB);
+ }
+ p->dcsr = saved_dcsr;
+
+ writel(DCSR_STRTA | DCSR_STRTB, p->base + DMA_DCSR_C);
+ }
+
+ return 0;
+}
+
+static int sa11x0_dma_resume(struct device *dev)
+{
+ struct sa11x0_dma_dev *d = dev_get_drvdata(dev);
+ unsigned pch;
+
+ for (pch = 0; pch < NR_PHY_CHAN; pch++) {
+ struct sa11x0_dma_phy *p = &d->phy[pch];
+ struct sa11x0_dma_desc *txd = NULL;
+ u32 dcsr = readl_relaxed(p->base + DMA_DCSR_R);
+
+ WARN_ON(dcsr & (DCSR_BIU | DCSR_STRTA | DCSR_STRTB | DCSR_RUN));
+
+ if (p->txd_done)
+ txd = p->txd_done;
+ else if (p->txd_load)
+ txd = p->txd_load;
+
+ if (!txd)
+ continue;
+
+ writel_relaxed(txd->ddar, p->base + DMA_DDAR);
+
+ writel_relaxed(p->dbs[0], p->base + DMA_DBSA);
+ writel_relaxed(p->dbt[0], p->base + DMA_DBTA);
+ writel_relaxed(p->dbs[1], p->base + DMA_DBSB);
+ writel_relaxed(p->dbt[1], p->base + DMA_DBTB);
+ writel_relaxed(p->dcsr, p->base + DMA_DCSR_S);
+ }
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops sa11x0_dma_pm_ops = {
+ .suspend_noirq = sa11x0_dma_suspend,
+ .resume_noirq = sa11x0_dma_resume,
+ .freeze_noirq = sa11x0_dma_suspend,
+ .thaw_noirq = sa11x0_dma_resume,
+ .poweroff_noirq = sa11x0_dma_suspend,
+ .restore_noirq = sa11x0_dma_resume,
+};
+
+static struct platform_driver sa11x0_dma_driver = {
+ .driver = {
+ .name = "sa11x0-dma",
+ .owner = THIS_MODULE,
+ .pm = &sa11x0_dma_pm_ops,
+ },
+ .probe = sa11x0_dma_probe,
+ .remove = __devexit_p(sa11x0_dma_remove),
+};
+
+bool sa11x0_dma_filter_fn(struct dma_chan *chan, void *param)
+{
+ if (chan->device->dev->driver == &sa11x0_dma_driver.driver) {
+ struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
+ const char *p = param;
+
+ return !strcmp(c->name, p);
+ }
+ return false;
+}
+EXPORT_SYMBOL(sa11x0_dma_filter_fn);
+
+static int __init sa11x0_dma_init(void)
+{
+ return platform_driver_register(&sa11x0_dma_driver);
+}
+subsys_initcall(sa11x0_dma_init);
+
+static void __exit sa11x0_dma_exit(void)
+{
+ platform_driver_unregister(&sa11x0_dma_driver);
+}
+module_exit(sa11x0_dma_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("SA-11x0 DMA driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sa11x0-dma");
diff --git a/drivers/net/irda/Kconfig b/drivers/net/irda/Kconfig
index e535137eb2d..468047866c8 100644
--- a/drivers/net/irda/Kconfig
+++ b/drivers/net/irda/Kconfig
@@ -356,7 +356,7 @@ config VLSI_FIR
config SA1100_FIR
tristate "SA1100 Internal IR"
- depends on ARCH_SA1100 && IRDA
+ depends on ARCH_SA1100 && IRDA && DMA_SA11X0
config VIA_FIR
tristate "VIA VT8231/VT1211 SIR/MIR/FIR"
diff --git a/drivers/net/irda/sa1100_ir.c b/drivers/net/irda/sa1100_ir.c
index da2705061a6..a0d1913a58d 100644
--- a/drivers/net/irda/sa1100_ir.c
+++ b/drivers/net/irda/sa1100_ir.c
@@ -15,7 +15,7 @@
* This driver takes one kernel command line parameter, sa1100ir=, with
* the following options:
* max_rate:baudrate - set the maximum baud rate
- * power_leve:level - set the transmitter power level
+ * power_level:level - set the transmitter power level
* tx_lpm:0|1 - set transmit low power mode
*/
#include <linux/module.h>
@@ -30,13 +30,13 @@
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/sa11x0-dma.h>
#include <net/irda/irda.h>
#include <net/irda/wrapper.h>
#include <net/irda/irda_device.h>
-#include <asm/irq.h>
-#include <mach/dma.h>
#include <mach/hardware.h>
#include <asm/mach/irda.h>
@@ -44,8 +44,15 @@ static int power_level = 3;
static int tx_lpm;
static int max_rate = 4000000;
+struct sa1100_buf {
+ struct device *dev;
+ struct sk_buff *skb;
+ struct scatterlist sg;
+ struct dma_chan *chan;
+ dma_cookie_t cookie;
+};
+
struct sa1100_irda {
- unsigned char hscr0;
unsigned char utcr4;
unsigned char power;
unsigned char open;
@@ -53,12 +60,8 @@ struct sa1100_irda {
int speed;
int newspeed;
- struct sk_buff *txskb;
- struct sk_buff *rxskb;
- dma_addr_t txbuf_dma;
- dma_addr_t rxbuf_dma;
- dma_regs_t *txdma;
- dma_regs_t *rxdma;
+ struct sa1100_buf dma_rx;
+ struct sa1100_buf dma_tx;
struct device *dev;
struct irda_platform_data *pdata;
@@ -67,23 +70,103 @@ struct sa1100_irda {
iobuff_t tx_buff;
iobuff_t rx_buff;
+
+ int (*tx_start)(struct sk_buff *, struct net_device *, struct sa1100_irda *);
+ irqreturn_t (*irq)(struct net_device *, struct sa1100_irda *);
};
+static int sa1100_irda_set_speed(struct sa1100_irda *, int);
+
#define IS_FIR(si) ((si)->speed >= 4000000)
#define HPSIR_MAX_RXLEN 2047
+static struct dma_slave_config sa1100_irda_sir_tx = {
+ .direction = DMA_TO_DEVICE,
+ .dst_addr = __PREG(Ser2UTDR),
+ .dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
+ .dst_maxburst = 4,
+};
+
+static struct dma_slave_config sa1100_irda_fir_rx = {
+ .direction = DMA_FROM_DEVICE,
+ .src_addr = __PREG(Ser2HSDR),
+ .src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
+ .src_maxburst = 8,
+};
+
+static struct dma_slave_config sa1100_irda_fir_tx = {
+ .direction = DMA_TO_DEVICE,
+ .dst_addr = __PREG(Ser2HSDR),
+ .dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
+ .dst_maxburst = 8,
+};
+
+static unsigned sa1100_irda_dma_xferred(struct sa1100_buf *buf)
+{
+ struct dma_chan *chan = buf->chan;
+ struct dma_tx_state state;
+ enum dma_status status;
+
+ status = chan->device->device_tx_status(chan, buf->cookie, &state);
+ if (status != DMA_PAUSED)
+ return 0;
+
+ return sg_dma_len(&buf->sg) - state.residue;
+}
+
+static int sa1100_irda_dma_request(struct device *dev, struct sa1100_buf *buf,
+ const char *name, struct dma_slave_config *cfg)
+{
+ dma_cap_mask_t m;
+ int ret;
+
+ dma_cap_zero(m);
+ dma_cap_set(DMA_SLAVE, m);
+
+ buf->chan = dma_request_channel(m, sa11x0_dma_filter_fn, (void *)name);
+ if (!buf->chan) {
+ dev_err(dev, "unable to request DMA channel for %s\n",
+ name);
+ return -ENOENT;
+ }
+
+ ret = dmaengine_slave_config(buf->chan, cfg);
+ if (ret)
+ dev_warn(dev, "DMA slave_config for %s returned %d\n",
+ name, ret);
+
+ buf->dev = buf->chan->device->dev;
+
+ return 0;
+}
+
+static void sa1100_irda_dma_start(struct sa1100_buf *buf,
+ enum dma_transfer_direction dir, dma_async_tx_callback cb, void *cb_p)
+{
+ struct dma_async_tx_descriptor *desc;
+ struct dma_chan *chan = buf->chan;
+
+ desc = chan->device->device_prep_slave_sg(chan, &buf->sg, 1, dir,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (desc) {
+ desc->callback = cb;
+ desc->callback_param = cb_p;
+ buf->cookie = dmaengine_submit(desc);
+ dma_async_issue_pending(chan);
+ }
+}
+
/*
* Allocate and map the receive buffer, unless it is already allocated.
*/
static int sa1100_irda_rx_alloc(struct sa1100_irda *si)
{
- if (si->rxskb)
+ if (si->dma_rx.skb)
return 0;
- si->rxskb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC);
-
- if (!si->rxskb) {
+ si->dma_rx.skb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC);
+ if (!si->dma_rx.skb) {
printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n");
return -ENOMEM;
}
@@ -92,11 +175,14 @@ static int sa1100_irda_rx_alloc(struct sa1100_irda *si)
* Align any IP headers that may be contained
* within the frame.
*/
- skb_reserve(si->rxskb, 1);
+ skb_reserve(si->dma_rx.skb, 1);
+
+ sg_set_buf(&si->dma_rx.sg, si->dma_rx.skb->data, HPSIR_MAX_RXLEN);
+ if (dma_map_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE) == 0) {
+ dev_kfree_skb_any(si->dma_rx.skb);
+ return -ENOMEM;
+ }
- si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data,
- HPSIR_MAX_RXLEN,
- DMA_FROM_DEVICE);
return 0;
}
@@ -106,7 +192,7 @@ static int sa1100_irda_rx_alloc(struct sa1100_irda *si)
*/
static void sa1100_irda_rx_dma_start(struct sa1100_irda *si)
{
- if (!si->rxskb) {
+ if (!si->dma_rx.skb) {
printk(KERN_ERR "sa1100_ir: rx buffer went missing\n");
return;
}
@@ -114,254 +200,87 @@ static void sa1100_irda_rx_dma_start(struct sa1100_irda *si)
/*
* First empty receive FIFO
*/
- Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
+ Ser2HSCR0 = HSCR0_HSSP;
/*
* Enable the DMA, receiver and receive interrupt.
*/
- sa1100_clear_dma(si->rxdma);
- sa1100_start_dma(si->rxdma, si->rxbuf_dma, HPSIR_MAX_RXLEN);
- Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_RXE;
+ dmaengine_terminate_all(si->dma_rx.chan);
+ sa1100_irda_dma_start(&si->dma_rx, DMA_DEV_TO_MEM, NULL, NULL);
+
+ Ser2HSCR0 = HSCR0_HSSP | HSCR0_RXE;
}
-/*
- * Set the IrDA communications speed.
- */
-static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed)
+static void sa1100_irda_check_speed(struct sa1100_irda *si)
{
- unsigned long flags;
- int brd, ret = -EINVAL;
-
- switch (speed) {
- case 9600: case 19200: case 38400:
- case 57600: case 115200:
- brd = 3686400 / (16 * speed) - 1;
-
- /*
- * Stop the receive DMA.
- */
- if (IS_FIR(si))
- sa1100_stop_dma(si->rxdma);
-
- local_irq_save(flags);
-
- Ser2UTCR3 = 0;
- Ser2HSCR0 = HSCR0_UART;
-
- Ser2UTCR1 = brd >> 8;
- Ser2UTCR2 = brd;
-
- /*
- * Clear status register
- */
- Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
- Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
-
- if (si->pdata->set_speed)
- si->pdata->set_speed(si->dev, speed);
-
- si->speed = speed;
-
- local_irq_restore(flags);
- ret = 0;
- break;
-
- case 4000000:
- local_irq_save(flags);
-
- si->hscr0 = 0;
-
- Ser2HSSR0 = 0xff;
- Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
- Ser2UTCR3 = 0;
-
- si->speed = speed;
-
- if (si->pdata->set_speed)
- si->pdata->set_speed(si->dev, speed);
-
- sa1100_irda_rx_alloc(si);
- sa1100_irda_rx_dma_start(si);
-
- local_irq_restore(flags);
-
- break;
-
- default:
- break;
+ if (si->newspeed) {
+ sa1100_irda_set_speed(si, si->newspeed);
+ si->newspeed = 0;
}
-
- return ret;
}
/*
- * Control the power state of the IrDA transmitter.
- * State:
- * 0 - off
- * 1 - short range, lowest power
- * 2 - medium range, medium power
- * 3 - maximum range, high power
- *
- * Currently, only assabet is known to support this.
+ * HP-SIR format support.
*/
-static int
-__sa1100_irda_set_power(struct sa1100_irda *si, unsigned int state)
+static void sa1100_irda_sirtxdma_irq(void *id)
{
- int ret = 0;
- if (si->pdata->set_power)
- ret = si->pdata->set_power(si->dev, state);
- return ret;
-}
-
-static inline int
-sa1100_set_power(struct sa1100_irda *si, unsigned int state)
-{
- int ret;
-
- ret = __sa1100_irda_set_power(si, state);
- if (ret == 0)
- si->power = state;
+ struct net_device *dev = id;
+ struct sa1100_irda *si = netdev_priv(dev);
- return ret;
-}
+ dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE);
+ dev_kfree_skb(si->dma_tx.skb);
+ si->dma_tx.skb = NULL;
-static int sa1100_irda_startup(struct sa1100_irda *si)
-{
- int ret;
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += sg_dma_len(&si->dma_tx.sg);
- /*
- * Ensure that the ports for this device are setup correctly.
- */
- if (si->pdata->startup) {
- ret = si->pdata->startup(si->dev);
- if (ret)
- return ret;
- }
-
- /*
- * Configure PPC for IRDA - we want to drive TXD2 low.
- * We also want to drive this pin low during sleep.
- */
- PPSR &= ~PPC_TXD2;
- PSDR &= ~PPC_TXD2;
- PPDR |= PPC_TXD2;
-
- /*
- * Enable HP-SIR modulation, and ensure that the port is disabled.
- */
- Ser2UTCR3 = 0;
- Ser2HSCR0 = HSCR0_UART;
- Ser2UTCR4 = si->utcr4;
- Ser2UTCR0 = UTCR0_8BitData;
- Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL;
+ /* We need to ensure that the transmitter has finished. */
+ do
+ rmb();
+ while (Ser2UTSR1 & UTSR1_TBY);
/*
- * Clear status register
+ * Ok, we've finished transmitting. Now enable the receiver.
+ * Sometimes we get a receive IRQ immediately after a transmit...
*/
Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
+ Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
- ret = sa1100_irda_set_speed(si, si->speed = 9600);
- if (ret) {
- Ser2UTCR3 = 0;
- Ser2HSCR0 = 0;
-
- if (si->pdata->shutdown)
- si->pdata->shutdown(si->dev);
- }
-
- return ret;
-}
-
-static void sa1100_irda_shutdown(struct sa1100_irda *si)
-{
- /*
- * Stop all DMA activity.
- */
- sa1100_stop_dma(si->rxdma);
- sa1100_stop_dma(si->txdma);
-
- /* Disable the port. */
- Ser2UTCR3 = 0;
- Ser2HSCR0 = 0;
+ sa1100_irda_check_speed(si);
- if (si->pdata->shutdown)
- si->pdata->shutdown(si->dev);
+ /* I'm hungry! */
+ netif_wake_queue(dev);
}
-#ifdef CONFIG_PM
-/*
- * Suspend the IrDA interface.
- */
-static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state)
+static int sa1100_irda_sir_tx_start(struct sk_buff *skb, struct net_device *dev,
+ struct sa1100_irda *si)
{
- struct net_device *dev = platform_get_drvdata(pdev);
- struct sa1100_irda *si;
-
- if (!dev)
- return 0;
-
- si = netdev_priv(dev);
- if (si->open) {
- /*
- * Stop the transmit queue
- */
- netif_device_detach(dev);
- disable_irq(dev->irq);
- sa1100_irda_shutdown(si);
- __sa1100_irda_set_power(si, 0);
+ si->tx_buff.data = si->tx_buff.head;
+ si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data,
+ si->tx_buff.truesize);
+
+ si->dma_tx.skb = skb;
+ sg_set_buf(&si->dma_tx.sg, si->tx_buff.data, si->tx_buff.len);
+ if (dma_map_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE) == 0) {
+ si->dma_tx.skb = NULL;
+ netif_wake_queue(dev);
+ dev->stats.tx_dropped++;
+ return NETDEV_TX_OK;
}
- return 0;
-}
-
-/*
- * Resume the IrDA interface.
- */
-static int sa1100_irda_resume(struct platform_device *pdev)
-{
- struct net_device *dev = platform_get_drvdata(pdev);
- struct sa1100_irda *si;
-
- if (!dev)
- return 0;
+ sa1100_irda_dma_start(&si->dma_tx, DMA_MEM_TO_DEV, sa1100_irda_sirtxdma_irq, dev);
- si = netdev_priv(dev);
- if (si->open) {
- /*
- * If we missed a speed change, initialise at the new speed
- * directly. It is debatable whether this is actually
- * required, but in the interests of continuing from where
- * we left off it is desirable. The converse argument is
- * that we should re-negotiate at 9600 baud again.
- */
- if (si->newspeed) {
- si->speed = si->newspeed;
- si->newspeed = 0;
- }
-
- sa1100_irda_startup(si);
- __sa1100_irda_set_power(si, si->power);
- enable_irq(dev->irq);
-
- /*
- * This automatically wakes up the queue
- */
- netif_device_attach(dev);
- }
+ /*
+ * The mean turn-around time is enforced by XBOF padding,
+ * so we don't have to do anything special here.
+ */
+ Ser2UTCR3 = UTCR3_TXE;
- return 0;
+ return NETDEV_TX_OK;
}
-#else
-#define sa1100_irda_suspend NULL
-#define sa1100_irda_resume NULL
-#endif
-/*
- * HP-SIR format interrupt service routines.
- */
-static void sa1100_irda_hpsir_irq(struct net_device *dev)
+static irqreturn_t sa1100_irda_sir_irq(struct net_device *dev, struct sa1100_irda *si)
{
- struct sa1100_irda *si = netdev_priv(dev);
int status;
status = Ser2UTSR0;
@@ -414,51 +333,96 @@ static void sa1100_irda_hpsir_irq(struct net_device *dev)
}
- if (status & UTSR0_TFS && si->tx_buff.len) {
- /*
- * Transmitter FIFO is not full
- */
- do {
- Ser2UTDR = *si->tx_buff.data++;
- si->tx_buff.len -= 1;
- } while (Ser2UTSR1 & UTSR1_TNF && si->tx_buff.len);
+ return IRQ_HANDLED;
+}
- if (si->tx_buff.len == 0) {
- dev->stats.tx_packets++;
- dev->stats.tx_bytes += si->tx_buff.data -
- si->tx_buff.head;
+/*
+ * FIR format support.
+ */
+static void sa1100_irda_firtxdma_irq(void *id)
+{
+ struct net_device *dev = id;
+ struct sa1100_irda *si = netdev_priv(dev);
+ struct sk_buff *skb;
- /*
- * We need to ensure that the transmitter has
- * finished.
- */
- do
- rmb();
- while (Ser2UTSR1 & UTSR1_TBY);
+ /*
+ * Wait for the transmission to complete. Unfortunately,
+ * the hardware doesn't give us an interrupt to indicate
+ * "end of frame".
+ */
+ do
+ rmb();
+ while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY);
- /*
- * Ok, we've finished transmitting. Now enable
- * the receiver. Sometimes we get a receive IRQ
- * immediately after a transmit...
- */
- Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
- Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
+ /*
+ * Clear the transmit underrun bit.
+ */
+ Ser2HSSR0 = HSSR0_TUR;
- if (si->newspeed) {
- sa1100_irda_set_speed(si, si->newspeed);
- si->newspeed = 0;
- }
+ /*
+ * Do we need to change speed? Note that we're lazy
+ * here - we don't free the old dma_rx.skb. We don't need
+ * to allocate a buffer either.
+ */
+ sa1100_irda_check_speed(si);
- /* I'm hungry! */
- netif_wake_queue(dev);
- }
+ /*
+ * Start reception. This disables the transmitter for
+ * us. This will be using the existing RX buffer.
+ */
+ sa1100_irda_rx_dma_start(si);
+
+ /* Account and free the packet. */
+ skb = si->dma_tx.skb;
+ if (skb) {
+ dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1,
+ DMA_TO_DEVICE);
+ dev->stats.tx_packets ++;
+ dev->stats.tx_bytes += skb->len;
+ dev_kfree_skb_irq(skb);
+ si->dma_tx.skb = NULL;
}
+
+ /*
+ * Make sure that the TX queue is available for sending
+ * (for retries). TX has priority over RX at all times.
+ */
+ netif_wake_queue(dev);
+}
+
+static int sa1100_irda_fir_tx_start(struct sk_buff *skb, struct net_device *dev,
+ struct sa1100_irda *si)
+{
+ int mtt = irda_get_mtt(skb);
+
+ si->dma_tx.skb = skb;
+ sg_set_buf(&si->dma_tx.sg, skb->data, skb->len);
+ if (dma_map_sg(si->dma_tx.dev, &si->dma_tx.sg, 1, DMA_TO_DEVICE) == 0) {
+ si->dma_tx.skb = NULL;
+ netif_wake_queue(dev);
+ dev->stats.tx_dropped++;
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
+ }
+
+ sa1100_irda_dma_start(&si->dma_tx, DMA_MEM_TO_DEV, sa1100_irda_firtxdma_irq, dev);
+
+ /*
+ * If we have a mean turn-around time, impose the specified
+ * specified delay. We could shorten this by timing from
+ * the point we received the packet.
+ */
+ if (mtt)
+ udelay(mtt);
+
+ Ser2HSCR0 = HSCR0_HSSP | HSCR0_TXE;
+
+ return NETDEV_TX_OK;
}
static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev)
{
- struct sk_buff *skb = si->rxskb;
- dma_addr_t dma_addr;
+ struct sk_buff *skb = si->dma_rx.skb;
unsigned int len, stat, data;
if (!skb) {
@@ -469,11 +433,10 @@ static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev
/*
* Get the current data position.
*/
- dma_addr = sa1100_get_dma_pos(si->rxdma);
- len = dma_addr - si->rxbuf_dma;
+ len = sa1100_irda_dma_xferred(&si->dma_rx);
if (len > HPSIR_MAX_RXLEN)
len = HPSIR_MAX_RXLEN;
- dma_unmap_single(si->dev, si->rxbuf_dma, len, DMA_FROM_DEVICE);
+ dma_unmap_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE);
do {
/*
@@ -501,7 +464,7 @@ static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev
} while (Ser2HSSR0 & HSSR0_EIF);
if (stat & HSSR1_EOF) {
- si->rxskb = NULL;
+ si->dma_rx.skb = NULL;
skb_put(skb, len);
skb->dev = dev;
@@ -518,28 +481,23 @@ static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev
netif_rx(skb);
} else {
/*
- * Remap the buffer.
+ * Remap the buffer - it was previously mapped, and we
+ * hope that this succeeds.
*/
- si->rxbuf_dma = dma_map_single(si->dev, si->rxskb->data,
- HPSIR_MAX_RXLEN,
- DMA_FROM_DEVICE);
+ dma_map_sg(si->dma_rx.dev, &si->dma_rx.sg, 1, DMA_FROM_DEVICE);
}
}
/*
- * FIR format interrupt service routine. We only have to
- * handle RX events; transmit events go via the TX DMA handler.
- *
- * No matter what, we disable RX, process, and the restart RX.
+ * We only have to handle RX events here; transmit events go via the TX
+ * DMA handler. We disable RX, process, and the restart RX.
*/
-static void sa1100_irda_fir_irq(struct net_device *dev)
+static irqreturn_t sa1100_irda_fir_irq(struct net_device *dev, struct sa1100_irda *si)
{
- struct sa1100_irda *si = netdev_priv(dev);
-
/*
* Stop RX DMA
*/
- sa1100_stop_dma(si->rxdma);
+ dmaengine_pause(si->dma_rx.chan);
/*
* Framing error - we throw away the packet completely.
@@ -555,7 +513,7 @@ static void sa1100_irda_fir_irq(struct net_device *dev)
/*
* Clear out the DMA...
*/
- Ser2HSCR0 = si->hscr0 | HSCR0_HSSP;
+ Ser2HSCR0 = HSCR0_HSSP;
/*
* Clear selected status bits now, so we
@@ -577,74 +535,124 @@ static void sa1100_irda_fir_irq(struct net_device *dev)
* No matter what happens, we must restart reception.
*/
sa1100_irda_rx_dma_start(si);
-}
-static irqreturn_t sa1100_irda_irq(int irq, void *dev_id)
-{
- struct net_device *dev = dev_id;
- if (IS_FIR(((struct sa1100_irda *)netdev_priv(dev))))
- sa1100_irda_fir_irq(dev);
- else
- sa1100_irda_hpsir_irq(dev);
return IRQ_HANDLED;
}
/*
- * TX DMA completion handler.
+ * Set the IrDA communications speed.
*/
-static void sa1100_irda_txdma_irq(void *id)
+static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed)
{
- struct net_device *dev = id;
- struct sa1100_irda *si = netdev_priv(dev);
- struct sk_buff *skb = si->txskb;
+ unsigned long flags;
+ int brd, ret = -EINVAL;
- si->txskb = NULL;
+ switch (speed) {
+ case 9600: case 19200: case 38400:
+ case 57600: case 115200:
+ brd = 3686400 / (16 * speed) - 1;
- /*
- * Wait for the transmission to complete. Unfortunately,
- * the hardware doesn't give us an interrupt to indicate
- * "end of frame".
- */
- do
- rmb();
- while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY);
+ /* Stop the receive DMA, and configure transmit. */
+ if (IS_FIR(si)) {
+ dmaengine_terminate_all(si->dma_rx.chan);
+ dmaengine_slave_config(si->dma_tx.chan,
+ &sa1100_irda_sir_tx);
+ }
- /*
- * Clear the transmit underrun bit.
- */
- Ser2HSSR0 = HSSR0_TUR;
+ local_irq_save(flags);
- /*
- * Do we need to change speed? Note that we're lazy
- * here - we don't free the old rxskb. We don't need
- * to allocate a buffer either.
- */
- if (si->newspeed) {
- sa1100_irda_set_speed(si, si->newspeed);
- si->newspeed = 0;
- }
+ Ser2UTCR3 = 0;
+ Ser2HSCR0 = HSCR0_UART;
- /*
- * Start reception. This disables the transmitter for
- * us. This will be using the existing RX buffer.
- */
- sa1100_irda_rx_dma_start(si);
+ Ser2UTCR1 = brd >> 8;
+ Ser2UTCR2 = brd;
- /*
- * Account and free the packet.
- */
- if (skb) {
- dma_unmap_single(si->dev, si->txbuf_dma, skb->len, DMA_TO_DEVICE);
- dev->stats.tx_packets ++;
- dev->stats.tx_bytes += skb->len;
- dev_kfree_skb_irq(skb);
+ /*
+ * Clear status register
+ */
+ Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
+ Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
+
+ if (si->pdata->set_speed)
+ si->pdata->set_speed(si->dev, speed);
+
+ si->speed = speed;
+ si->tx_start = sa1100_irda_sir_tx_start;
+ si->irq = sa1100_irda_sir_irq;
+
+ local_irq_restore(flags);
+ ret = 0;
+ break;
+
+ case 4000000:
+ if (!IS_FIR(si))
+ dmaengine_slave_config(si->dma_tx.chan,
+ &sa1100_irda_fir_tx);
+
+ local_irq_save(flags);
+
+ Ser2HSSR0 = 0xff;
+ Ser2HSCR0 = HSCR0_HSSP;
+ Ser2UTCR3 = 0;
+
+ si->speed = speed;
+ si->tx_start = sa1100_irda_fir_tx_start;
+ si->irq = sa1100_irda_fir_irq;
+
+ if (si->pdata->set_speed)
+ si->pdata->set_speed(si->dev, speed);
+
+ sa1100_irda_rx_alloc(si);
+ sa1100_irda_rx_dma_start(si);
+
+ local_irq_restore(flags);
+
+ break;
+
+ default:
+ break;
}
- /*
- * Make sure that the TX queue is available for sending
- * (for retries). TX has priority over RX at all times.
- */
- netif_wake_queue(dev);
+ return ret;
+}
+
+/*
+ * Control the power state of the IrDA transmitter.
+ * State:
+ * 0 - off
+ * 1 - short range, lowest power
+ * 2 - medium range, medium power
+ * 3 - maximum range, high power
+ *
+ * Currently, only assabet is known to support this.
+ */
+static int
+__sa1100_irda_set_power(struct sa1100_irda *si, unsigned int state)
+{
+ int ret = 0;
+ if (si->pdata->set_power)
+ ret = si->pdata->set_power(si->dev, state);
+ return ret;
+}
+
+static inline int
+sa1100_set_power(struct sa1100_irda *si, unsigned int state)
+{
+ int ret;
+
+ ret = __sa1100_irda_set_power(si, state);
+ if (ret == 0)
+ si->power = state;
+
+ return ret;
+}
+
+static irqreturn_t sa1100_irda_irq(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct sa1100_irda *si = netdev_priv(dev);
+
+ return si->irq(dev, si);
}
static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
@@ -660,62 +668,19 @@ static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
if (speed != si->speed && speed != -1)
si->newspeed = speed;
- /*
- * If this is an empty frame, we can bypass a lot.
- */
+ /* If this is an empty frame, we can bypass a lot. */
if (skb->len == 0) {
- if (si->newspeed) {
- si->newspeed = 0;
- sa1100_irda_set_speed(si, speed);
- }
+ sa1100_irda_check_speed(si);
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
- if (!IS_FIR(si)) {
- netif_stop_queue(dev);
-
- si->tx_buff.data = si->tx_buff.head;
- si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data,
- si->tx_buff.truesize);
-
- /*
- * Set the transmit interrupt enable. This will fire
- * off an interrupt immediately. Note that we disable
- * the receiver so we won't get spurious characteres
- * received.
- */
- Ser2UTCR3 = UTCR3_TIE | UTCR3_TXE;
-
- dev_kfree_skb(skb);
- } else {
- int mtt = irda_get_mtt(skb);
-
- /*
- * We must not be transmitting...
- */
- BUG_ON(si->txskb);
-
- netif_stop_queue(dev);
-
- si->txskb = skb;
- si->txbuf_dma = dma_map_single(si->dev, skb->data,
- skb->len, DMA_TO_DEVICE);
-
- sa1100_start_dma(si->txdma, si->txbuf_dma, skb->len);
-
- /*
- * If we have a mean turn-around time, impose the specified
- * specified delay. We could shorten this by timing from
- * the point we received the packet.
- */
- if (mtt)
- udelay(mtt);
+ netif_stop_queue(dev);
- Ser2HSCR0 = si->hscr0 | HSCR0_HSSP | HSCR0_TXE;
- }
+ /* We must not already have a skb to transmit... */
+ BUG_ON(si->dma_tx.skb);
- return NETDEV_TX_OK;
+ return si->tx_start(skb, dev, si);
}
static int
@@ -762,6 +727,69 @@ sa1100_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
return ret;
}
+static int sa1100_irda_startup(struct sa1100_irda *si)
+{
+ int ret;
+
+ /*
+ * Ensure that the ports for this device are setup correctly.
+ */
+ if (si->pdata->startup) {
+ ret = si->pdata->startup(si->dev);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * Configure PPC for IRDA - we want to drive TXD2 low.
+ * We also want to drive this pin low during sleep.
+ */
+ PPSR &= ~PPC_TXD2;
+ PSDR &= ~PPC_TXD2;
+ PPDR |= PPC_TXD2;
+
+ /*
+ * Enable HP-SIR modulation, and ensure that the port is disabled.
+ */
+ Ser2UTCR3 = 0;
+ Ser2HSCR0 = HSCR0_UART;
+ Ser2UTCR4 = si->utcr4;
+ Ser2UTCR0 = UTCR0_8BitData;
+ Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL;
+
+ /*
+ * Clear status register
+ */
+ Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
+
+ ret = sa1100_irda_set_speed(si, si->speed = 9600);
+ if (ret) {
+ Ser2UTCR3 = 0;
+ Ser2HSCR0 = 0;
+
+ if (si->pdata->shutdown)
+ si->pdata->shutdown(si->dev);
+ }
+
+ return ret;
+}
+
+static void sa1100_irda_shutdown(struct sa1100_irda *si)
+{
+ /*
+ * Stop all DMA activity.
+ */
+ dmaengine_terminate_all(si->dma_rx.chan);
+ dmaengine_terminate_all(si->dma_tx.chan);
+
+ /* Disable the port. */
+ Ser2UTCR3 = 0;
+ Ser2HSCR0 = 0;
+
+ if (si->pdata->shutdown)
+ si->pdata->shutdown(si->dev);
+}
+
static int sa1100_irda_start(struct net_device *dev)
{
struct sa1100_irda *si = netdev_priv(dev);
@@ -769,26 +797,17 @@ static int sa1100_irda_start(struct net_device *dev)
si->speed = 9600;
- err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev);
- if (err)
- goto err_irq;
-
- err = sa1100_request_dma(DMA_Ser2HSSPRd, "IrDA receive",
- NULL, NULL, &si->rxdma);
+ err = sa1100_irda_dma_request(si->dev, &si->dma_rx, "Ser2ICPRc",
+ &sa1100_irda_fir_rx);
if (err)
goto err_rx_dma;
- err = sa1100_request_dma(DMA_Ser2HSSPWr, "IrDA transmit",
- sa1100_irda_txdma_irq, dev, &si->txdma);
+ err = sa1100_irda_dma_request(si->dev, &si->dma_tx, "Ser2ICPTr",
+ &sa1100_irda_sir_tx);
if (err)
goto err_tx_dma;
/*
- * The interrupt must remain disabled for now.
- */
- disable_irq(dev->irq);
-
- /*
* Setup the serial port for the specified speed.
*/
err = sa1100_irda_startup(si);
@@ -803,44 +822,60 @@ static int sa1100_irda_start(struct net_device *dev)
if (!si->irlap)
goto err_irlap;
+ err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev);
+ if (err)
+ goto err_irq;
+
/*
* Now enable the interrupt and start the queue
*/
si->open = 1;
sa1100_set_power(si, power_level); /* low power mode */
- enable_irq(dev->irq);
+
netif_start_queue(dev);
return 0;
+err_irq:
+ irlap_close(si->irlap);
err_irlap:
si->open = 0;
sa1100_irda_shutdown(si);
err_startup:
- sa1100_free_dma(si->txdma);
+ dma_release_channel(si->dma_tx.chan);
err_tx_dma:
- sa1100_free_dma(si->rxdma);
+ dma_release_channel(si->dma_rx.chan);
err_rx_dma:
- free_irq(dev->irq, dev);
-err_irq:
return err;
}
static int sa1100_irda_stop(struct net_device *dev)
{
struct sa1100_irda *si = netdev_priv(dev);
+ struct sk_buff *skb;
+
+ netif_stop_queue(dev);
- disable_irq(dev->irq);
+ si->open = 0;
sa1100_irda_shutdown(si);
/*
- * If we have been doing DMA receive, make sure we
+ * If we have been doing any DMA activity, make sure we
* tidy that up cleanly.
*/
- if (si->rxskb) {
- dma_unmap_single(si->dev, si->rxbuf_dma, HPSIR_MAX_RXLEN,
- DMA_FROM_DEVICE);
- dev_kfree_skb(si->rxskb);
- si->rxskb = NULL;
+ skb = si->dma_rx.skb;
+ if (skb) {
+ dma_unmap_sg(si->dma_rx.dev, &si->dma_rx.sg, 1,
+ DMA_FROM_DEVICE);
+ dev_kfree_skb(skb);
+ si->dma_rx.skb = NULL;
+ }
+
+ skb = si->dma_tx.skb;
+ if (skb) {
+ dma_unmap_sg(si->dma_tx.dev, &si->dma_tx.sg, 1,
+ DMA_TO_DEVICE);
+ dev_kfree_skb(skb);
+ si->dma_tx.skb = NULL;
}
/* Stop IrLAP */
@@ -849,14 +884,11 @@ static int sa1100_irda_stop(struct net_device *dev)
si->irlap = NULL;
}
- netif_stop_queue(dev);
- si->open = 0;
-
/*
* Free resources
*/
- sa1100_free_dma(si->txdma);
- sa1100_free_dma(si->rxdma);
+ dma_release_channel(si->dma_tx.chan);
+ dma_release_channel(si->dma_rx.chan);
free_irq(dev->irq, dev);
sa1100_set_power(si, 0);
@@ -888,11 +920,15 @@ static int sa1100_irda_probe(struct platform_device *pdev)
struct net_device *dev;
struct sa1100_irda *si;
unsigned int baudrate_mask;
- int err;
+ int err, irq;
if (!pdev->dev.platform_data)
return -EINVAL;
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0)
+ return irq < 0 ? irq : -ENXIO;
+
err = request_mem_region(__PREG(Ser2UTCR0), 0x24, "IrDA") ? 0 : -EBUSY;
if (err)
goto err_mem_1;
@@ -907,22 +943,27 @@ static int sa1100_irda_probe(struct platform_device *pdev)
if (!dev)
goto err_mem_4;
+ SET_NETDEV_DEV(dev, &pdev->dev);
+
si = netdev_priv(dev);
si->dev = &pdev->dev;
si->pdata = pdev->dev.platform_data;
+ sg_init_table(&si->dma_rx.sg, 1);
+ sg_init_table(&si->dma_tx.sg, 1);
+
/*
* Initialise the HP-SIR buffers
*/
err = sa1100_irda_init_iobuf(&si->rx_buff, 14384);
if (err)
goto err_mem_5;
- err = sa1100_irda_init_iobuf(&si->tx_buff, 4000);
+ err = sa1100_irda_init_iobuf(&si->tx_buff, IRDA_SIR_MAX_FRAME);
if (err)
goto err_mem_5;
dev->netdev_ops = &sa1100_irda_netdev_ops;
- dev->irq = IRQ_Ser2ICP;
+ dev->irq = irq;
irda_init_max_qos_capabilies(&si->qos);
@@ -996,6 +1037,74 @@ static int sa1100_irda_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+/*
+ * Suspend the IrDA interface.
+ */
+static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct sa1100_irda *si;
+
+ if (!dev)
+ return 0;
+
+ si = netdev_priv(dev);
+ if (si->open) {
+ /*
+ * Stop the transmit queue
+ */
+ netif_device_detach(dev);
+ disable_irq(dev->irq);
+ sa1100_irda_shutdown(si);
+ __sa1100_irda_set_power(si, 0);
+ }
+
+ return 0;
+}
+
+/*
+ * Resume the IrDA interface.
+ */
+static int sa1100_irda_resume(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct sa1100_irda *si;
+
+ if (!dev)
+ return 0;
+
+ si = netdev_priv(dev);
+ if (si->open) {
+ /*
+ * If we missed a speed change, initialise at the new speed
+ * directly. It is debatable whether this is actually
+ * required, but in the interests of continuing from where
+ * we left off it is desirable. The converse argument is
+ * that we should re-negotiate at 9600 baud again.
+ */
+ if (si->newspeed) {
+ si->speed = si->newspeed;
+ si->newspeed = 0;
+ }
+
+ sa1100_irda_startup(si);
+ __sa1100_irda_set_power(si, si->power);
+ enable_irq(dev->irq);
+
+ /*
+ * This automatically wakes up the queue
+ */
+ netif_device_attach(dev);
+ }
+
+ return 0;
+}
+#else
+#define sa1100_irda_suspend NULL
+#define sa1100_irda_resume NULL
+#endif
+
static struct platform_driver sa1100ir_driver = {
.probe = sa1100_irda_probe,
.remove = sa1100_irda_remove,
diff --git a/include/linux/sa11x0-dma.h b/include/linux/sa11x0-dma.h
new file mode 100644
index 00000000000..65839a58b8e
--- /dev/null
+++ b/include/linux/sa11x0-dma.h
@@ -0,0 +1,24 @@
+/*
+ * SA11x0 DMA Engine support
+ *
+ * Copyright (C) 2012 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __LINUX_SA11X0_DMA_H
+#define __LINUX_SA11X0_DMA_H
+
+struct dma_chan;
+
+#if defined(CONFIG_DMA_SA11X0) || defined(CONFIG_DMA_SA11X0_MODULE)
+bool sa11x0_dma_filter_fn(struct dma_chan *, void *);
+#else
+static inline bool sa11x0_dma_filter_fn(struct dma_chan *c, void *d)
+{
+ return false;
+}
+#endif
+
+#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-24 07:59:45 +0000