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Subject[RFC PATCH 2/2 -mm] RapidIO: TSI721 Add DMA Engine support
Date
Adds support for DMA Engine API.

Includes following changes:
- Modifies BDMA register offset definitions to support per-channel handling
- Separates BDMA channel reserved for RIO Maintenance requests
- Adds DMA Engine callback routines

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
---
drivers/rapidio/devices/Kconfig | 8 +
drivers/rapidio/devices/Makefile | 1 +
drivers/rapidio/devices/tsi721.c | 201 ++++++----
drivers/rapidio/devices/tsi721.h | 107 ++++-
drivers/rapidio/devices/tsi721_dma.c | 802 ++++++++++++++++++++++++++++++++++
5 files changed, 1029 insertions(+), 90 deletions(-)
create mode 100644 drivers/rapidio/devices/tsi721_dma.c
diff --git a/drivers/rapidio/devices/Kconfig b/drivers/rapidio/devices/Kconfig
index 12a9d7f..3a2db3d 100644
--- a/drivers/rapidio/devices/Kconfig
+++ b/drivers/rapidio/devices/Kconfig
@@ -8,3 +8,11 @@ config RAPIDIO_TSI721
default "n"
---help---
Include support for IDT Tsi721 PCI Express Serial RapidIO controller.
+
+config TSI721_DMA
+ bool "IDT Tsi721 RapidIO DMA support"
+ depends on RAPIDIO_TSI721
+ default "n"
+ select RAPIDIO_DMA_ENGINE
+ help
+ Enable DMA support for IDT Tsi721 PCIe-to-SRIO controller.
diff --git a/drivers/rapidio/devices/Makefile b/drivers/rapidio/devices/Makefile
index 3b7b4e2..8cbce45 100644
--- a/drivers/rapidio/devices/Makefile
+++ b/drivers/rapidio/devices/Makefile
@@ -3,3 +3,4 @@
#

obj-$(CONFIG_RAPIDIO_TSI721) += tsi721.o
+obj-$(CONFIG_TSI721_DMA) += tsi721_dma.o
diff --git a/drivers/rapidio/devices/tsi721.c b/drivers/rapidio/devices/tsi721.c
index 5225930..5e893a6 100644
--- a/drivers/rapidio/devices/tsi721.c
+++ b/drivers/rapidio/devices/tsi721.c
@@ -108,6 +108,7 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
u16 destid, u8 hopcount, u32 offset, int len,
u32 *data, int do_wr)
{
+ void __iomem *regs = priv->regs + TSI721_DMAC_BASE(priv->mdma.ch_id);
struct tsi721_dma_desc *bd_ptr;
u32 rd_count, swr_ptr, ch_stat;
int i, err = 0;
@@ -116,10 +117,9 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
if (offset > (RIO_MAINT_SPACE_SZ - len) || (len != sizeof(u32)))
return -EINVAL;

- bd_ptr = priv->bdma[TSI721_DMACH_MAINT].bd_base;
+ bd_ptr = priv->mdma.bd_base;

- rd_count = ioread32(
- priv->regs + TSI721_DMAC_DRDCNT(TSI721_DMACH_MAINT));
+ rd_count = ioread32(regs + TSI721_DMAC_DRDCNT);

/* Initialize DMA descriptor */
bd_ptr[0].type_id = cpu_to_le32((DTYPE2 << 29) | (op << 19) | destid);
@@ -134,19 +134,18 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
mb();

/* Start DMA operation */
- iowrite32(rd_count + 2,
- priv->regs + TSI721_DMAC_DWRCNT(TSI721_DMACH_MAINT));
- ioread32(priv->regs + TSI721_DMAC_DWRCNT(TSI721_DMACH_MAINT));
+ iowrite32(rd_count + 2, regs + TSI721_DMAC_DWRCNT);
+ ioread32(regs + TSI721_DMAC_DWRCNT);
i = 0;

/* Wait until DMA transfer is finished */
- while ((ch_stat = ioread32(priv->regs +
- TSI721_DMAC_STS(TSI721_DMACH_MAINT))) & TSI721_DMAC_STS_RUN) {
+ while ((ch_stat = ioread32(regs + TSI721_DMAC_STS))
+ & TSI721_DMAC_STS_RUN) {
udelay(1);
if (++i >= 5000000) {
dev_dbg(&priv->pdev->dev,
"%s : DMA[%d] read timeout ch_status=%x\n",
- __func__, TSI721_DMACH_MAINT, ch_stat);
+ __func__, priv->mdma.ch_id, ch_stat);
if (!do_wr)
*data = 0xffffffff;
err = -EIO;
@@ -162,13 +161,10 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
__func__, ch_stat);
dev_dbg(&priv->pdev->dev, "OP=%d : destid=%x hc=%x off=%x\n",
do_wr ? MAINT_WR : MAINT_RD, destid, hopcount, offset);
- iowrite32(TSI721_DMAC_INT_ALL,
- priv->regs + TSI721_DMAC_INT(TSI721_DMACH_MAINT));
- iowrite32(TSI721_DMAC_CTL_INIT,
- priv->regs + TSI721_DMAC_CTL(TSI721_DMACH_MAINT));
+ iowrite32(TSI721_DMAC_INT_ALL, regs + TSI721_DMAC_INT);
+ iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
udelay(10);
- iowrite32(0, priv->regs +
- TSI721_DMAC_DWRCNT(TSI721_DMACH_MAINT));
+ iowrite32(0, regs + TSI721_DMAC_DWRCNT);
udelay(1);
if (!do_wr)
*data = 0xffffffff;
@@ -184,8 +180,8 @@ static int tsi721_maint_dma(struct tsi721_device *priv, u32 sys_size,
* NOTE: Skipping check and clear FIFO entries because we are waiting
* for transfer to be completed.
*/
- swr_ptr = ioread32(priv->regs + TSI721_DMAC_DSWP(TSI721_DMACH_MAINT));
- iowrite32(swr_ptr, priv->regs + TSI721_DMAC_DSRP(TSI721_DMACH_MAINT));
+ swr_ptr = ioread32(regs + TSI721_DMAC_DSWP);
+ iowrite32(swr_ptr, regs + TSI721_DMAC_DSRP);
err_out:

return err;
@@ -540,6 +536,22 @@ static irqreturn_t tsi721_irqhandler(int irq, void *ptr)
tsi721_pw_handler(mport);
}

+#ifdef CONFIG_TSI721_DMA
+ if (dev_int & TSI721_DEV_INT_BDMA_CH) {
+ int ch;
+
+ if (dev_ch_int & TSI721_INT_BDMA_CHAN_M) {
+ dev_dbg(&priv->pdev->dev,
+ "IRQ from DMA channel 0x%08x\n", dev_ch_int);
+
+ for (ch = 0; ch < TSI721_DMA_MAXCH; ch++) {
+ if (!(dev_ch_int & TSI721_INT_BDMA_CHAN(ch)))
+ continue;
+ tsi721_bdma_handler(&priv->bdma[ch]);
+ }
+ }
+ }
+#endif
return IRQ_HANDLED;
}

@@ -552,18 +564,26 @@ static void tsi721_interrupts_init(struct tsi721_device *priv)
priv->regs + TSI721_SR_CHINT(IDB_QUEUE));
iowrite32(TSI721_SR_CHINT_IDBQRCV,
priv->regs + TSI721_SR_CHINTE(IDB_QUEUE));
- iowrite32(TSI721_INT_SR2PC_CHAN(IDB_QUEUE),
- priv->regs + TSI721_DEV_CHAN_INTE);

/* Enable SRIO MAC interrupts */
iowrite32(TSI721_RIO_EM_DEV_INT_EN_INT,
priv->regs + TSI721_RIO_EM_DEV_INT_EN);

+ /* Enable interrupts from channels in use */
+#ifdef CONFIG_TSI721_DMA
+ intr = TSI721_INT_SR2PC_CHAN(IDB_QUEUE) |
+ (TSI721_INT_BDMA_CHAN_M &
+ ~TSI721_INT_BDMA_CHAN(TSI721_DMACH_MAINT));
+#else
+ intr = TSI721_INT_SR2PC_CHAN(IDB_QUEUE);
+#endif
+ iowrite32(intr, priv->regs + TSI721_DEV_CHAN_INTE);
+
if (priv->flags & TSI721_USING_MSIX)
intr = TSI721_DEV_INT_SRIO;
else
intr = TSI721_DEV_INT_SR2PC_CH | TSI721_DEV_INT_SRIO |
- TSI721_DEV_INT_SMSG_CH;
+ TSI721_DEV_INT_SMSG_CH | TSI721_DEV_INT_BDMA_CH;

iowrite32(intr, priv->regs + TSI721_DEV_INTE);
ioread32(priv->regs + TSI721_DEV_INTE);
@@ -714,12 +734,29 @@ static int tsi721_enable_msix(struct tsi721_device *priv)
TSI721_MSIX_OMSG_INT(i);
}

+#ifdef CONFIG_TSI721_DMA
+ /*
+ * Initialize MSI-X entries for Block DMA Engine:
+ * this driver supports XXX DMA channels
+ * (one is reserved for SRIO maintenance transactions)
+ */
+ for (i = 0; i < TSI721_DMA_CHNUM; i++) {
+ entries[TSI721_VECT_DMA0_DONE + i].entry =
+ TSI721_MSIX_DMACH_DONE(i);
+ entries[TSI721_VECT_DMA0_INT + i].entry =
+ TSI721_MSIX_DMACH_INT(i);
+ }
+#endif /* CONFIG_TSI721_DMA */
+
err = pci_enable_msix(priv->pdev, entries, ARRAY_SIZE(entries));
if (err) {
if (err > 0)
dev_info(&priv->pdev->dev,
"Only %d MSI-X vectors available, "
"not using MSI-X\n", err);
+ else
+ dev_err(&priv->pdev->dev,
+ "Failed to enable MSI-X (err=%d)\n", err);
return err;
}

@@ -759,6 +796,22 @@ static int tsi721_enable_msix(struct tsi721_device *priv)
i, pci_name(priv->pdev));
}

+#ifdef CONFIG_TSI721_DMA
+ for (i = 0; i < TSI721_DMA_CHNUM; i++) {
+ priv->msix[TSI721_VECT_DMA0_DONE + i].vector =
+ entries[TSI721_VECT_DMA0_DONE + i].vector;
+ snprintf(priv->msix[TSI721_VECT_DMA0_DONE + i].irq_name,
+ IRQ_DEVICE_NAME_MAX, DRV_NAME "-dmad%d@pci:%s",
+ i, pci_name(priv->pdev));
+
+ priv->msix[TSI721_VECT_DMA0_INT + i].vector =
+ entries[TSI721_VECT_DMA0_INT + i].vector;
+ snprintf(priv->msix[TSI721_VECT_DMA0_INT + i].irq_name,
+ IRQ_DEVICE_NAME_MAX, DRV_NAME "-dmai%d@pci:%s",
+ i, pci_name(priv->pdev));
+ }
+#endif /* CONFIG_TSI721_DMA */
+
return 0;
}
#endif /* CONFIG_PCI_MSI */
@@ -889,20 +942,34 @@ static void tsi721_doorbell_free(struct tsi721_device *priv)
priv->idb_base = NULL;
}

-static int tsi721_bdma_ch_init(struct tsi721_device *priv, int chnum)
+/**
+ * tsi721_bdma_maint_init - Initialize maintenance request BDMA channel.
+ * @priv: pointer to tsi721 private data
+ *
+ * Initialize BDMA channel allocated for RapidIO maintenance read/write
+ * request generation
+ * Returns %0 on success or %-ENOMEM on failure.
+ */
+static int tsi721_bdma_maint_init(struct tsi721_device *priv)
{
struct tsi721_dma_desc *bd_ptr;
u64 *sts_ptr;
dma_addr_t bd_phys, sts_phys;
int sts_size;
- int bd_num = priv->bdma[chnum].bd_num;
+ int bd_num = 2;
+ void __iomem *regs;

- dev_dbg(&priv->pdev->dev, "Init Block DMA Engine, CH%d\n", chnum);
+ dev_dbg(&priv->pdev->dev,
+ "Init Block DMA Engine for Maintenance requests, CH%d\n",
+ TSI721_DMACH_MAINT);

/*
* Initialize DMA channel for maintenance requests
*/

+ priv->mdma.ch_id = TSI721_DMACH_MAINT;
+ regs = priv->regs + TSI721_DMAC_BASE(TSI721_DMACH_MAINT);
+
/* Allocate space for DMA descriptors */
bd_ptr = dma_alloc_coherent(&priv->pdev->dev,
bd_num * sizeof(struct tsi721_dma_desc),
@@ -910,8 +977,9 @@ static int tsi721_bdma_ch_init(struct tsi721_device *priv, int chnum)
if (!bd_ptr)
return -ENOMEM;

- priv->bdma[chnum].bd_phys = bd_phys;
- priv->bdma[chnum].bd_base = bd_ptr;
+ priv->mdma.bd_num = bd_num;
+ priv->mdma.bd_phys = bd_phys;
+ priv->mdma.bd_base = bd_ptr;

memset(bd_ptr, 0, bd_num * sizeof(struct tsi721_dma_desc));

@@ -930,13 +998,13 @@ static int tsi721_bdma_ch_init(struct tsi721_device *priv, int chnum)
dma_free_coherent(&priv->pdev->dev,
bd_num * sizeof(struct tsi721_dma_desc),
bd_ptr, bd_phys);
- priv->bdma[chnum].bd_base = NULL;
+ priv->mdma.bd_base = NULL;
return -ENOMEM;
}

- priv->bdma[chnum].sts_phys = sts_phys;
- priv->bdma[chnum].sts_base = sts_ptr;
- priv->bdma[chnum].sts_size = sts_size;
+ priv->mdma.sts_phys = sts_phys;
+ priv->mdma.sts_base = sts_ptr;
+ priv->mdma.sts_size = sts_size;

memset(sts_ptr, 0, sts_size);

@@ -951,83 +1019,61 @@ static int tsi721_bdma_ch_init(struct tsi721_device *priv, int chnum)
bd_ptr[bd_num - 1].next_hi = cpu_to_le32((u64)bd_phys >> 32);

/* Setup DMA descriptor pointers */
- iowrite32(((u64)bd_phys >> 32),
- priv->regs + TSI721_DMAC_DPTRH(chnum));
+ iowrite32(((u64)bd_phys >> 32), regs + TSI721_DMAC_DPTRH);
iowrite32(((u64)bd_phys & TSI721_DMAC_DPTRL_MASK),
- priv->regs + TSI721_DMAC_DPTRL(chnum));
+ regs + TSI721_DMAC_DPTRL);

/* Setup descriptor status FIFO */
- iowrite32(((u64)sts_phys >> 32),
- priv->regs + TSI721_DMAC_DSBH(chnum));
+ iowrite32(((u64)sts_phys >> 32), regs + TSI721_DMAC_DSBH);
iowrite32(((u64)sts_phys & TSI721_DMAC_DSBL_MASK),
- priv->regs + TSI721_DMAC_DSBL(chnum));
+ regs + TSI721_DMAC_DSBL);
iowrite32(TSI721_DMAC_DSSZ_SIZE(sts_size),
- priv->regs + TSI721_DMAC_DSSZ(chnum));
+ regs + TSI721_DMAC_DSSZ);

/* Clear interrupt bits */
- iowrite32(TSI721_DMAC_INT_ALL,
- priv->regs + TSI721_DMAC_INT(chnum));
+ iowrite32(TSI721_DMAC_INT_ALL, regs + TSI721_DMAC_INT);

- ioread32(priv->regs + TSI721_DMAC_INT(chnum));
+ ioread32(regs + TSI721_DMAC_INT);

/* Toggle DMA channel initialization */
- iowrite32(TSI721_DMAC_CTL_INIT, priv->regs + TSI721_DMAC_CTL(chnum));
- ioread32(priv->regs + TSI721_DMAC_CTL(chnum));
+ iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);
+ ioread32(regs + TSI721_DMAC_CTL);
udelay(10);

return 0;
}

-static int tsi721_bdma_ch_free(struct tsi721_device *priv, int chnum)
+static int tsi721_bdma_maint_free(struct tsi721_device *priv)
{
u32 ch_stat;
+ struct tsi721_bdma_maint *mdma = &priv->mdma;
+ void __iomem *regs = priv->regs + TSI721_DMAC_BASE(mdma->ch_id);

- if (priv->bdma[chnum].bd_base == NULL)
+ if (mdma->bd_base == NULL)
return 0;

/* Check if DMA channel still running */
- ch_stat = ioread32(priv->regs + TSI721_DMAC_STS(chnum));
+ ch_stat = ioread32(regs + TSI721_DMAC_STS);
if (ch_stat & TSI721_DMAC_STS_RUN)
return -EFAULT;

/* Put DMA channel into init state */
- iowrite32(TSI721_DMAC_CTL_INIT,
- priv->regs + TSI721_DMAC_CTL(chnum));
+ iowrite32(TSI721_DMAC_CTL_INIT, regs + TSI721_DMAC_CTL);

/* Free space allocated for DMA descriptors */
dma_free_coherent(&priv->pdev->dev,
- priv->bdma[chnum].bd_num * sizeof(struct tsi721_dma_desc),
- priv->bdma[chnum].bd_base, priv->bdma[chnum].bd_phys);
- priv->bdma[chnum].bd_base = NULL;
+ mdma->bd_num * sizeof(struct tsi721_dma_desc),
+ mdma->bd_base, mdma->bd_phys);
+ mdma->bd_base = NULL;

/* Free space allocated for status FIFO */
dma_free_coherent(&priv->pdev->dev,
- priv->bdma[chnum].sts_size * sizeof(struct tsi721_dma_sts),
- priv->bdma[chnum].sts_base, priv->bdma[chnum].sts_phys);
- priv->bdma[chnum].sts_base = NULL;
- return 0;
-}
-
-static int tsi721_bdma_init(struct tsi721_device *priv)
-{
- /* Initialize BDMA channel allocated for RapidIO maintenance read/write
- * request generation
- */
- priv->bdma[TSI721_DMACH_MAINT].bd_num = 2;
- if (tsi721_bdma_ch_init(priv, TSI721_DMACH_MAINT)) {
- dev_err(&priv->pdev->dev, "Unable to initialize maintenance DMA"
- " channel %d, aborting\n", TSI721_DMACH_MAINT);
- return -ENOMEM;
- }
-
+ mdma->sts_size * sizeof(struct tsi721_dma_sts),
+ mdma->sts_base, mdma->sts_phys);
+ mdma->sts_base = NULL;
return 0;
}

-static void tsi721_bdma_free(struct tsi721_device *priv)
-{
- tsi721_bdma_ch_free(priv, TSI721_DMACH_MAINT);
-}
-
/* Enable Inbound Messaging Interrupts */
static void
tsi721_imsg_interrupt_enable(struct tsi721_device *priv, int ch,
@@ -2043,7 +2089,8 @@ static void tsi721_disable_ints(struct tsi721_device *priv)

/* Disable all BDMA Channel interrupts */
for (ch = 0; ch < TSI721_DMA_MAXCH; ch++)
- iowrite32(0, priv->regs + TSI721_DMAC_INTE(ch));
+ iowrite32(0,
+ priv->regs + TSI721_DMAC_BASE(ch) + TSI721_DMAC_INTE);

/* Disable all general BDMA interrupts */
iowrite32(0, priv->regs + TSI721_BDMA_INTE);
@@ -2292,7 +2339,7 @@ static int __devinit tsi721_probe(struct pci_dev *pdev,
tsi721_init_pc2sr_mapping(priv);
tsi721_init_sr2pc_mapping(priv);

- if (tsi721_bdma_init(priv)) {
+ if (tsi721_bdma_maint_init(priv)) {
dev_err(&pdev->dev, "BDMA initialization failed, aborting\n");
err = -ENOMEM;
goto err_unmap_bars;
@@ -2312,12 +2359,16 @@ static int __devinit tsi721_probe(struct pci_dev *pdev,
if (err)
goto err_free_consistent;

+#ifdef CONFIG_TSI721_DMA
+ tsi721_register_dma(priv);
+#endif
+
return 0;

err_free_consistent:
tsi721_doorbell_free(priv);
err_free_bdma:
- tsi721_bdma_free(priv);
+ tsi721_bdma_maint_free(priv);
err_unmap_bars:
if (priv->regs)
iounmap(priv->regs);
diff --git a/drivers/rapidio/devices/tsi721.h b/drivers/rapidio/devices/tsi721.h
index 58be4de..2f756dc 100644
--- a/drivers/rapidio/devices/tsi721.h
+++ b/drivers/rapidio/devices/tsi721.h
@@ -21,6 +21,10 @@
#ifndef __TSI721_H
#define __TSI721_H

+#ifdef CONFIG_TSI721_DMA
+#include <linux/dmaengine.h>
+#endif
+
#define DRV_NAME "tsi721"

#define DEFAULT_HOPCOUNT 0xff
@@ -165,6 +169,8 @@
#define TSI721_DEV_INTE 0x29840
#define TSI721_DEV_INT 0x29844
#define TSI721_DEV_INTSET 0x29848
+#define TSI721_DEV_INT_BDMA_CH 0x00002000
+#define TSI721_DEV_INT_BDMA_NCH 0x00001000
#define TSI721_DEV_INT_SMSG_CH 0x00000800
#define TSI721_DEV_INT_SMSG_NCH 0x00000400
#define TSI721_DEV_INT_SR2PC_CH 0x00000200
@@ -179,6 +185,8 @@
#define TSI721_INT_IMSG_CHAN(x) (1 << (16 + (x)))
#define TSI721_INT_OMSG_CHAN_M 0x0000ff00
#define TSI721_INT_OMSG_CHAN(x) (1 << (8 + (x)))
+#define TSI721_INT_BDMA_CHAN_M 0x000000ff
+#define TSI721_INT_BDMA_CHAN(x) (1 << (x))

/*
* PC2SR block registers
@@ -233,14 +241,16 @@
* x = 0..7
*/

-#define TSI721_DMAC_DWRCNT(x) (0x51000 + (x) * 0x1000)
-#define TSI721_DMAC_DRDCNT(x) (0x51004 + (x) * 0x1000)
+#define TSI721_DMAC_BASE(x) (0x51000 + (x) * 0x1000)
+
+#define TSI721_DMAC_DWRCNT 0x000
+#define TSI721_DMAC_DRDCNT 0x004

-#define TSI721_DMAC_CTL(x) (0x51008 + (x) * 0x1000)
+#define TSI721_DMAC_CTL 0x008
#define TSI721_DMAC_CTL_SUSP 0x00000002
#define TSI721_DMAC_CTL_INIT 0x00000001

-#define TSI721_DMAC_INT(x) (0x5100c + (x) * 0x1000)
+#define TSI721_DMAC_INT 0x00c
#define TSI721_DMAC_INT_STFULL 0x00000010
#define TSI721_DMAC_INT_DONE 0x00000008
#define TSI721_DMAC_INT_SUSP 0x00000004
@@ -248,34 +258,33 @@
#define TSI721_DMAC_INT_IOFDONE 0x00000001
#define TSI721_DMAC_INT_ALL 0x0000001f

-#define TSI721_DMAC_INTSET(x) (0x51010 + (x) * 0x1000)
+#define TSI721_DMAC_INTSET 0x010

-#define TSI721_DMAC_STS(x) (0x51014 + (x) * 0x1000)
+#define TSI721_DMAC_STS 0x014
#define TSI721_DMAC_STS_ABORT 0x00400000
#define TSI721_DMAC_STS_RUN 0x00200000
#define TSI721_DMAC_STS_CS 0x001f0000

-#define TSI721_DMAC_INTE(x) (0x51018 + (x) * 0x1000)
+#define TSI721_DMAC_INTE 0x018

-#define TSI721_DMAC_DPTRL(x) (0x51024 + (x) * 0x1000)
+#define TSI721_DMAC_DPTRL 0x024
#define TSI721_DMAC_DPTRL_MASK 0xffffffe0

-#define TSI721_DMAC_DPTRH(x) (0x51028 + (x) * 0x1000)
+#define TSI721_DMAC_DPTRH 0x028

-#define TSI721_DMAC_DSBL(x) (0x5102c + (x) * 0x1000)
+#define TSI721_DMAC_DSBL 0x02c
#define TSI721_DMAC_DSBL_MASK 0xffffffc0

-#define TSI721_DMAC_DSBH(x) (0x51030 + (x) * 0x1000)
+#define TSI721_DMAC_DSBH 0x030

-#define TSI721_DMAC_DSSZ(x) (0x51034 + (x) * 0x1000)
+#define TSI721_DMAC_DSSZ 0x034
#define TSI721_DMAC_DSSZ_SIZE_M 0x0000000f
#define TSI721_DMAC_DSSZ_SIZE(size) (__fls(size) - 4)

-
-#define TSI721_DMAC_DSRP(x) (0x51038 + (x) * 0x1000)
+#define TSI721_DMAC_DSRP 0x038
#define TSI721_DMAC_DSRP_MASK 0x0007ffff

-#define TSI721_DMAC_DSWP(x) (0x5103c + (x) * 0x1000)
+#define TSI721_DMAC_DSWP 0x03c
#define TSI721_DMAC_DSWP_MASK 0x0007ffff

#define TSI721_BDMA_INTE 0x5f000
@@ -624,7 +633,48 @@ enum tsi721_smsg_int_flag {

/* Structures */

+#ifdef CONFIG_TSI721_DMA
+
+struct tsi721_tx_desc {
+ struct dma_async_tx_descriptor txd;
+ struct tsi721_dma_desc *hw_desc;
+ u16 destid;
+ /* low 64-bits of 66-bit RIO address */
+ u64 rio_addr;
+ /* upper 2-bits of 66-bit RIO address */
+ u8 rio_addr_u;
+ bool interrupt;
+ struct list_head desc_node;
+ struct list_head tx_list;
+};
+
struct tsi721_bdma_chan {
+ int id;
+ void __iomem *regs;
+ int bd_num; /* number of buffer descriptors */
+ void *bd_base; /* start of DMA descriptors */
+ dma_addr_t bd_phys;
+ void *sts_base; /* start of DMA BD status FIFO */
+ dma_addr_t sts_phys;
+ int sts_size;
+ u32 sts_rdptr;
+ u32 wr_count;
+ u32 wr_count_next;
+
+ struct dma_chan dchan;
+ struct tsi721_tx_desc *tx_desc;
+ spinlock_t lock;
+ struct list_head active_list;
+ struct list_head queue;
+ struct list_head free_list;
+ dma_cookie_t completed_cookie;
+ struct tasklet_struct tasklet;
+};
+
+#endif /* CONFIG_TSI721_DMA */
+
+struct tsi721_bdma_maint {
+ int ch_id; /* BDMA channel number */
int bd_num; /* number of buffer descriptors */
void *bd_base; /* start of DMA descriptors */
dma_addr_t bd_phys;
@@ -719,6 +769,24 @@ enum tsi721_msix_vect {
TSI721_VECT_IMB1_INT,
TSI721_VECT_IMB2_INT,
TSI721_VECT_IMB3_INT,
+#ifdef CONFIG_TSI721_DMA
+ TSI721_VECT_DMA0_DONE,
+ TSI721_VECT_DMA1_DONE,
+ TSI721_VECT_DMA2_DONE,
+ TSI721_VECT_DMA3_DONE,
+ TSI721_VECT_DMA4_DONE,
+ TSI721_VECT_DMA5_DONE,
+ TSI721_VECT_DMA6_DONE,
+ TSI721_VECT_DMA7_DONE,
+ TSI721_VECT_DMA0_INT,
+ TSI721_VECT_DMA1_INT,
+ TSI721_VECT_DMA2_INT,
+ TSI721_VECT_DMA3_INT,
+ TSI721_VECT_DMA4_INT,
+ TSI721_VECT_DMA5_INT,
+ TSI721_VECT_DMA6_INT,
+ TSI721_VECT_DMA7_INT,
+#endif /* CONFIG_TSI721_DMA */
TSI721_VECT_MAX
};

@@ -752,7 +820,11 @@ struct tsi721_device {
u32 pw_discard_count;

/* BDMA Engine */
+ struct tsi721_bdma_maint mdma; /* Maintenance rd/wr request channel */
+
+#ifdef CONFIG_TSI721_DMA
struct tsi721_bdma_chan bdma[TSI721_DMA_CHNUM];
+#endif

/* Inbound Messaging */
int imsg_init[TSI721_IMSG_CHNUM];
@@ -763,4 +835,9 @@ struct tsi721_device {
struct tsi721_omsg_ring omsg_ring[TSI721_OMSG_CHNUM];
};

+#ifdef CONFIG_TSI721_DMA
+extern void tsi721_bdma_handler(struct tsi721_bdma_chan *chan);
+extern int __devinit tsi721_register_dma(struct tsi721_device *priv);
+#endif
+
#endif
diff --git a/drivers/rapidio/devices/tsi721_dma.c b/drivers/rapidio/devices/tsi721_dma.c
new file mode 100644
index 0000000..75a27a0
--- /dev/null
+++ b/drivers/rapidio/devices/tsi721_dma.c
@@ -0,0 +1,802 @@
+/*
+ * DMA Engine support for Tsi721 PCIExpress-to-SRIO bridge
+ *
+ * Copyright 2011 Integrated Device Technology, Inc.
+ * Alexandre Bounine <alexandre.bounine@idt.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/io.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/rio.h>
+#include <linux/rio_drv.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/kfifo.h>
+#include <linux/delay.h>
+
+#include "tsi721.h"
+
+static inline struct tsi721_bdma_chan *to_tsi721_chan(struct dma_chan *chan)
+{
+ return container_of(chan, struct tsi721_bdma_chan, dchan);
+}
+
+static inline struct tsi721_device *to_tsi721(struct dma_device *ddev)
+{
+ return container_of(ddev, struct rio_mport, dma)->priv;
+}
+
+static inline
+struct tsi721_tx_desc *to_tsi721_desc(struct dma_async_tx_descriptor *txd)
+{
+ return container_of(txd, struct tsi721_tx_desc, txd);
+}
+
+static inline
+struct tsi721_tx_desc *tsi721_dma_first_active(struct tsi721_bdma_chan *chan)
+{
+ return list_first_entry(&chan->active_list,
+ struct tsi721_tx_desc, desc_node);
+}
+
+static int tsi721_bdma_ch_init(struct tsi721_bdma_chan *chan)
+{
+ struct tsi721_dma_desc *bd_ptr;
+ struct device *dev = chan->dchan.device->dev;
+ u64 *sts_ptr;
+ dma_addr_t bd_phys;
+ dma_addr_t sts_phys;
+ int sts_size;
+ int bd_num = chan->bd_num;
+
+ dev_dbg(dev, "Init Block DMA Engine, CH%d\n", chan->id);
+
+ /* Allocate space for DMA descriptors */
+ bd_ptr = dma_alloc_coherent(dev,
+ bd_num * sizeof(struct tsi721_dma_desc),
+ &bd_phys, GFP_KERNEL);
+ if (!bd_ptr)
+ return -ENOMEM;
+
+ chan->bd_phys = bd_phys;
+ chan->bd_base = bd_ptr;
+
+ memset(bd_ptr, 0, bd_num * sizeof(struct tsi721_dma_desc));
+
+ dev_dbg(dev, "DMA descriptors @ %p (phys = %llx)\n",
+ bd_ptr, (unsigned long long)bd_phys);
+
+ /* Allocate space for descriptor status FIFO */
+ sts_size = (bd_num >= TSI721_DMA_MINSTSSZ) ?
+ bd_num : TSI721_DMA_MINSTSSZ;
+ sts_size = roundup_pow_of_two(sts_size);
+ sts_ptr = dma_alloc_coherent(dev,
+ sts_size * sizeof(struct tsi721_dma_sts),
+ &sts_phys, GFP_KERNEL);
+ if (!sts_ptr) {
+ /* Free space allocated for DMA descriptors */
+ dma_free_coherent(dev,
+ bd_num * sizeof(struct tsi721_dma_desc),
+ bd_ptr, bd_phys);
+ chan->bd_base = NULL;
+ return -ENOMEM;
+ }
+
+ chan->sts_phys = sts_phys;
+ chan->sts_base = sts_ptr;
+ chan->sts_size = sts_size;
+
+ memset(sts_ptr, 0, sts_size);
+
+ dev_dbg(dev,
+ "desc status FIFO @ %p (phys = %llx) size=0x%x\n",
+ sts_ptr, (unsigned long long)sts_phys, sts_size);
+
+ /* Initialize DMA descriptors ring */
+ bd_ptr[bd_num - 1].type_id = cpu_to_le32(DTYPE3 << 29);
+ bd_ptr[bd_num - 1].next_lo = cpu_to_le32((u64)bd_phys &
+ TSI721_DMAC_DPTRL_MASK);
+ bd_ptr[bd_num - 1].next_hi = cpu_to_le32((u64)bd_phys >> 32);
+
+ /* Setup DMA descriptor pointers */
+ iowrite32(((u64)bd_phys >> 32),
+ chan->regs + TSI721_DMAC_DPTRH);
+ iowrite32(((u64)bd_phys & TSI721_DMAC_DPTRL_MASK),
+ chan->regs + TSI721_DMAC_DPTRL);
+
+ /* Setup descriptor status FIFO */
+ iowrite32(((u64)sts_phys >> 32),
+ chan->regs + TSI721_DMAC_DSBH);
+ iowrite32(((u64)sts_phys & TSI721_DMAC_DSBL_MASK),
+ chan->regs + TSI721_DMAC_DSBL);
+ iowrite32(TSI721_DMAC_DSSZ_SIZE(sts_size),
+ chan->regs + TSI721_DMAC_DSSZ);
+
+ /* Clear interrupt bits */
+ iowrite32(TSI721_DMAC_INT_ALL,
+ chan->regs + TSI721_DMAC_INT);
+
+ ioread32(chan->regs + TSI721_DMAC_INT);
+
+ /* Toggle DMA channel initialization */
+ iowrite32(TSI721_DMAC_CTL_INIT, chan->regs + TSI721_DMAC_CTL);
+ ioread32(chan->regs + TSI721_DMAC_CTL);
+ chan->wr_count = chan->wr_count_next = 0;
+ chan->sts_rdptr = 0;
+ udelay(10);
+
+ return 0;
+}
+
+static int tsi721_bdma_ch_free(struct tsi721_bdma_chan *chan)
+{
+ u32 ch_stat;
+
+ if (chan->bd_base == NULL)
+ return 0;
+
+ /* Check if DMA channel still running */
+ ch_stat = ioread32(chan->regs + TSI721_DMAC_STS);
+ if (ch_stat & TSI721_DMAC_STS_RUN)
+ return -EFAULT;
+
+ /* Put DMA channel into init state */
+ iowrite32(TSI721_DMAC_CTL_INIT, chan->regs + TSI721_DMAC_CTL);
+
+ /* Free space allocated for DMA descriptors */
+ dma_free_coherent(chan->dchan.device->dev,
+ chan->bd_num * sizeof(struct tsi721_dma_desc),
+ chan->bd_base, chan->bd_phys);
+ chan->bd_base = NULL;
+
+ /* Free space allocated for status FIFO */
+ dma_free_coherent(chan->dchan.device->dev,
+ chan->sts_size * sizeof(struct tsi721_dma_sts),
+ chan->sts_base, chan->sts_phys);
+ chan->sts_base = NULL;
+ return 0;
+}
+
+static
+void tsi721_bdma_interrupt_enable(struct tsi721_bdma_chan *chan, int enable)
+{
+ if (enable) {
+ /* Clear pending BDMA channel interrupts */
+ iowrite32(TSI721_DMAC_INT_ALL, chan->regs + TSI721_DMAC_INT);
+ ioread32(chan->regs + TSI721_DMAC_INT);
+ /* Enable BDMA channel interrupts */
+ iowrite32(TSI721_DMAC_INT_ALL, chan->regs + TSI721_DMAC_INTE);
+ } else {
+ /* Disable BDMA channel interrupts */
+ iowrite32(0, chan->regs + TSI721_DMAC_INTE);
+ /* Clear pending BDMA channel interrupts */
+ iowrite32(TSI721_DMAC_INT_ALL, chan->regs + TSI721_DMAC_INT);
+ }
+
+}
+
+static bool tsi721_dma_is_idle(struct tsi721_bdma_chan *chan)
+{
+ u32 sts;
+
+ sts = ioread32(chan->regs + TSI721_DMAC_STS);
+ return ((sts & TSI721_DMAC_STS_RUN) == 0);
+}
+
+void tsi721_bdma_handler(struct tsi721_bdma_chan *chan)
+{
+ /* Disable BDMA channel interrupts */
+ iowrite32(0, chan->regs + TSI721_DMAC_INTE);
+
+ tasklet_schedule(&chan->tasklet);
+}
+
+#ifdef CONFIG_PCI_MSI
+/**
+ * tsi721_omsg_msix - MSI-X interrupt handler for outbound messaging
+ * @irq: Linux interrupt number
+ * @ptr: Pointer to interrupt-specific data (mport structure)
+ *
+ * Handles outbound messaging interrupts signaled using MSI-X.
+ */
+static irqreturn_t tsi721_bdma_msix(int irq, void *ptr)
+{
+ struct tsi721_bdma_chan *chan = ptr;
+
+ tsi721_bdma_handler(chan);
+ return IRQ_HANDLED;
+}
+#endif /* CONFIG_PCI_MSI */
+
+/* Must be called with the spinlock held */
+static void tsi721_start_dma(struct tsi721_bdma_chan *chan)
+{
+ if (!tsi721_dma_is_idle(chan)) {
+ dev_err(chan->dchan.device->dev,
+ "BUG: Attempt to start non-idle channel\n");
+ return;
+ }
+
+ if (chan->wr_count == chan->wr_count_next) {
+ dev_err(chan->dchan.device->dev,
+ "BUG: Attempt to start DMA with no BDs ready\n");
+ return;
+ }
+
+ dev_dbg(chan->dchan.device->dev,
+ "tx_chan: %p, chan: %d, regs: %p\n",
+ chan, chan->dchan.chan_id, chan->regs);
+
+ iowrite32(chan->wr_count_next, chan->regs + TSI721_DMAC_DWRCNT);
+ ioread32(chan->regs + TSI721_DMAC_DWRCNT);
+
+ chan->wr_count = chan->wr_count_next;
+}
+
+static void tsi721_desc_put(struct tsi721_bdma_chan *chan,
+ struct tsi721_tx_desc *desc)
+{
+ dev_dbg(chan->dchan.device->dev, "Put desc: %p into free list\n", desc);
+
+ if (desc) {
+ spin_lock_bh(&chan->lock);
+ list_splice_init(&desc->tx_list, &chan->free_list);
+ list_add(&desc->desc_node, &chan->free_list);
+ chan->wr_count_next = chan->wr_count;
+ spin_unlock_bh(&chan->lock);
+ }
+}
+
+static struct tsi721_tx_desc *tsi721_desc_get(struct tsi721_bdma_chan *chan)
+{
+ struct tsi721_tx_desc *tx_desc, *_tx_desc;
+ struct tsi721_tx_desc *ret = NULL;
+ int i;
+
+ spin_lock_bh(&chan->lock);
+ list_for_each_entry_safe(tx_desc, _tx_desc,
+ &chan->free_list, desc_node) {
+ if (async_tx_test_ack(&tx_desc->txd)) {
+ list_del(&tx_desc->desc_node);
+ ret = tx_desc;
+ break;
+ }
+ dev_dbg(chan->dchan.device->dev,
+ "desc %p not ACKed\n", tx_desc);
+ }
+
+ i = chan->wr_count_next % chan->bd_num;
+ if (i == chan->bd_num - 1) {
+ i = 0;
+ chan->wr_count_next++; /* skip link descriptor */
+ }
+
+ chan->wr_count_next++;
+ tx_desc->txd.phys = chan->bd_phys + i * sizeof(struct tsi721_dma_desc);
+ tx_desc->hw_desc = &((struct tsi721_dma_desc *)chan->bd_base)[i];
+
+ spin_unlock_bh(&chan->lock);
+
+ return ret;
+}
+
+static
+int tsi721_fill_desc(struct tsi721_bdma_chan *chan, struct tsi721_tx_desc *desc,
+ struct scatterlist *sg, enum dma_rtype rtype, u32 sys_size)
+{
+ struct tsi721_dma_desc *bd_ptr = desc->hw_desc;
+ u64 rio_addr;
+
+ if (sg_dma_len(sg) > TSI721_DMAD_BCOUNT1 + 1) {
+ dev_err(chan->dchan.device->dev, "SG element is too large\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(chan->dchan.device->dev,
+ "desc: 0x%llx, addr: 0x%llx len: 0x%x\n",
+ (u64)desc->txd.phys, (unsigned long long)sg_dma_address(sg),
+ sg_dma_len(sg));
+
+ dev_dbg(chan->dchan.device->dev, "bd_ptr = %p did=%d raddr=0x%llx\n",
+ bd_ptr, desc->destid, desc->rio_addr);
+
+ /* Initialize DMA descriptor */
+ bd_ptr->type_id = cpu_to_le32((DTYPE1 << 29) |
+ (rtype << 19) | desc->destid);
+ if (desc->interrupt)
+ bd_ptr->type_id |= cpu_to_le32(TSI721_DMAD_IOF);
+ bd_ptr->bcount = cpu_to_le32(((desc->rio_addr & 0x3) << 30) |
+ (sys_size << 26) | sg_dma_len(sg));
+ rio_addr = (desc->rio_addr >> 2) |
+ ((u64)(desc->rio_addr_u & 0x3) << 62);
+ bd_ptr->raddr_lo = cpu_to_le32(rio_addr & 0xffffffff);
+ bd_ptr->raddr_hi = cpu_to_le32(rio_addr >> 32);
+ bd_ptr->t1.bufptr_lo = cpu_to_le32(
+ (u64)sg_dma_address(sg) & 0xffffffff);
+ bd_ptr->t1.bufptr_hi = cpu_to_le32((u64)sg_dma_address(sg) >> 32);
+ bd_ptr->t1.s_dist = 0;
+ bd_ptr->t1.s_size = 0;
+
+ mb();
+
+ return 0;
+}
+
+static void tsi721_dma_chain_complete(struct tsi721_bdma_chan *chan,
+ struct tsi721_tx_desc *desc)
+{
+ struct dma_async_tx_descriptor *txd = &desc->txd;
+ dma_async_tx_callback callback = txd->callback;
+ void *param = txd->callback_param;
+
+ list_splice_init(&desc->tx_list, &chan->free_list);
+ list_move(&desc->desc_node, &chan->free_list);
+ chan->completed_cookie = txd->cookie;
+
+ if (callback)
+ callback(param);
+}
+
+static void tsi721_dma_complete_all(struct tsi721_bdma_chan *chan)
+{
+ struct tsi721_tx_desc *desc, *_d;
+ LIST_HEAD(list);
+
+ BUG_ON(!tsi721_dma_is_idle(chan));
+
+ if (!list_empty(&chan->queue))
+ tsi721_start_dma(chan);
+
+ list_splice_init(&chan->active_list, &list);
+ list_splice_init(&chan->queue, &chan->active_list);
+
+ list_for_each_entry_safe(desc, _d, &list, desc_node)
+ tsi721_dma_chain_complete(chan, desc);
+}
+
+static void tsi721_clr_stat(struct tsi721_bdma_chan *chan)
+{
+ u32 srd_ptr;
+ u64 *sts_ptr;
+ int i, j;
+
+ /* Check and clear descriptor status FIFO entries */
+ srd_ptr = chan->sts_rdptr;
+ sts_ptr = chan->sts_base;
+ j = srd_ptr * 8;
+ while (sts_ptr[j]) {
+ for (i = 0; i < 8 && sts_ptr[j]; i++, j++)
+ sts_ptr[j] = 0;
+
+ ++srd_ptr;
+ srd_ptr %= chan->sts_size;
+ j = srd_ptr * 8;
+ }
+
+ iowrite32(srd_ptr, chan->regs + TSI721_DMAC_DSRP);
+ chan->sts_rdptr = srd_ptr;
+}
+
+static void tsi721_advance_work(struct tsi721_bdma_chan *chan)
+{
+ if (list_empty(&chan->active_list) ||
+ list_is_singular(&chan->active_list)) {
+ dev_dbg(chan->dchan.device->dev,
+ "%s: Active_list empty\n", __func__);
+ tsi721_dma_complete_all(chan);
+ } else {
+ dev_dbg(chan->dchan.device->dev,
+ "%s: Active_list NOT empty\n", __func__);
+ tsi721_dma_chain_complete(chan, tsi721_dma_first_active(chan));
+ tsi721_start_dma(chan);
+ }
+}
+
+static void tsi721_dma_tasklet(unsigned long data)
+{
+ struct tsi721_bdma_chan *chan = (struct tsi721_bdma_chan *)data;
+ u32 dmac_int, dmac_sts;
+
+ dmac_int = ioread32(chan->regs + TSI721_DMAC_INT);
+ dev_dbg(chan->dchan.device->dev, "%s: DMAC%d_INT = 0x%x\n",
+ __func__, chan->id, dmac_int);
+ /* Clear channel interrupts */
+ iowrite32(dmac_int, chan->regs + TSI721_DMAC_INT);
+
+ if (dmac_int & TSI721_DMAC_INT_ERR) {
+ dmac_sts = ioread32(chan->regs + TSI721_DMAC_STS);
+ dev_err(chan->dchan.device->dev,
+ "%s: DMA ERROR - DMAC%d_STS = 0x%x\n",
+ __func__, chan->id, dmac_sts);
+ }
+
+ if (dmac_int & TSI721_DMAC_INT_STFULL) {
+ dev_err(chan->dchan.device->dev,
+ "%s: DMAC%d descriptor status FIFO is full\n",
+ __func__, chan->id);
+ }
+
+ if (dmac_int & (TSI721_DMAC_INT_DONE | TSI721_DMAC_INT_IOFDONE)) {
+ tsi721_clr_stat(chan);
+ spin_lock(&chan->lock);
+ tsi721_advance_work(chan);
+ spin_unlock(&chan->lock);
+ }
+
+ /* Re-Enable BDMA channel interrupts */
+ iowrite32(TSI721_DMAC_INT_ALL, chan->regs + TSI721_DMAC_INTE);
+}
+
+static dma_cookie_t tsi721_tx_submit(struct dma_async_tx_descriptor *txd)
+{
+ struct tsi721_tx_desc *desc = to_tsi721_desc(txd);
+ struct tsi721_bdma_chan *chan = to_tsi721_chan(txd->chan);
+ dma_cookie_t cookie;
+
+ spin_lock_bh(&chan->lock);
+
+ cookie = txd->chan->cookie;
+ if (++cookie < 0)
+ cookie = 1;
+ txd->chan->cookie = cookie;
+ txd->cookie = cookie;
+
+ if (list_empty(&chan->active_list)) {
+ list_add_tail(&desc->desc_node, &chan->active_list);
+ tsi721_start_dma(chan);
+ } else {
+ list_add_tail(&desc->desc_node, &chan->queue);
+ }
+
+ spin_unlock_bh(&chan->lock);
+ return cookie;
+}
+
+static int tsi721_alloc_chan_resources(struct dma_chan *dchan)
+{
+ struct tsi721_bdma_chan *chan = to_tsi721_chan(dchan);
+ struct tsi721_device *priv = to_tsi721(dchan->device);
+ struct tsi721_tx_desc *desc = NULL;
+ LIST_HEAD(tmp_list);
+ int i;
+ int rc;
+
+ if (chan->bd_base)
+ return chan->bd_num - 1;
+
+ /* Initialize BDMA channel */
+ if (tsi721_bdma_ch_init(chan)) {
+ dev_err(dchan->device->dev, "Unable to initialize data DMA"
+ " channel %d, aborting\n", chan->id);
+ return -ENOMEM;
+ }
+
+ /* Allocate matching number of logical descriptors */
+ desc = kzalloc((chan->bd_num - 1) * sizeof(struct tsi721_tx_desc),
+ GFP_KERNEL);
+ if (!desc) {
+ dev_err(dchan->device->dev,
+ "Failed to allocate logical descriptors\n");
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ chan->tx_desc = desc;
+
+ for (i = 0; i < chan->bd_num - 1; i++) {
+ dma_async_tx_descriptor_init(&desc[i].txd, dchan);
+ desc[i].txd.tx_submit = tsi721_tx_submit;
+ desc[i].txd.flags = DMA_CTRL_ACK;
+ INIT_LIST_HEAD(&desc[i].tx_list);
+ list_add_tail(&desc[i].desc_node, &tmp_list);
+ }
+
+ spin_lock_bh(&chan->lock);
+ list_splice(&tmp_list, &chan->free_list);
+ chan->completed_cookie = dchan->cookie = 1;
+ spin_unlock_bh(&chan->lock);
+
+#ifdef CONFIG_PCI_MSI
+ if (priv->flags & TSI721_USING_MSIX) {
+ /* Request interrupt service if we are in MSI-X mode */
+ rc = request_irq(
+ priv->msix[TSI721_VECT_DMA0_DONE + chan->id].vector,
+ tsi721_bdma_msix, 0,
+ priv->msix[TSI721_VECT_DMA0_DONE + chan->id].irq_name,
+ (void *)chan);
+
+ if (rc) {
+ dev_dbg(dchan->device->dev,
+ "Unable to allocate MSI-X interrupt for "
+ "BDMA%d-DONE\n", chan->id);
+ goto err_out;
+ }
+
+ rc = request_irq(priv->msix[TSI721_VECT_DMA0_INT +
+ chan->id].vector,
+ tsi721_bdma_msix, 0,
+ priv->msix[TSI721_VECT_DMA0_INT + chan->id].irq_name,
+ (void *)chan);
+
+ if (rc) {
+ dev_dbg(dchan->device->dev,
+ "Unable to allocate MSI-X interrupt for "
+ "BDMA%d-INT\n", chan->id);
+ free_irq(
+ priv->msix[TSI721_VECT_DMA0_DONE +
+ chan->id].vector,
+ (void *)chan);
+ rc = -EIO;
+ goto err_out;
+ }
+ }
+#endif /* CONFIG_PCI_MSI */
+
+ tsi721_bdma_interrupt_enable(chan, 1);
+
+ return chan->bd_num - 1;
+
+err_out:
+ kfree(desc);
+ tsi721_bdma_ch_free(chan);
+ return rc;
+}
+
+static void tsi721_free_chan_resources(struct dma_chan *dchan)
+{
+ struct tsi721_bdma_chan *chan = to_tsi721_chan(dchan);
+ struct tsi721_device *priv = to_tsi721(dchan->device);
+ LIST_HEAD(list);
+
+ dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
+
+ BUG_ON(!list_empty(&chan->active_list));
+ BUG_ON(!list_empty(&chan->queue));
+
+ spin_lock_irq(&chan->lock);
+ list_splice_init(&chan->free_list, &list);
+ spin_unlock_irq(&chan->lock);
+
+ tsi721_bdma_interrupt_enable(chan, 0);
+
+#ifdef CONFIG_PCI_MSI
+ if (priv->flags & TSI721_USING_MSIX) {
+ free_irq(priv->msix[TSI721_VECT_DMA0_DONE + chan->id].vector,
+ (void *)chan);
+ free_irq(priv->msix[TSI721_VECT_DMA0_INT + chan->id].vector,
+ (void *)chan);
+ }
+#endif /* CONFIG_PCI_MSI */
+
+ tsi721_bdma_ch_free(chan);
+ kfree(chan->tx_desc);
+}
+
+static
+enum dma_status tsi721_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
+ dma_cookie_t last_used;
+ dma_cookie_t last_completed;
+ int ret;
+
+ spin_lock_irq(&bdma_chan->lock);
+ last_completed = bdma_chan->completed_cookie;
+ last_used = dchan->cookie;
+ spin_unlock_irq(&bdma_chan->lock);
+
+ ret = dma_async_is_complete(cookie, last_completed, last_used);
+
+ dma_set_tx_state(txstate, last_completed, last_used, 0);
+
+ dev_dbg(dchan->device->dev,
+ "%s: exit, ret: %d, last_completed: %d, last_used: %d\n",
+ __func__, ret, last_completed, last_used);
+
+ return ret;
+}
+
+static void tsi721_issue_pending(struct dma_chan *dchan)
+{
+ struct tsi721_bdma_chan *chan = to_tsi721_chan(dchan);
+
+ dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
+
+ if (tsi721_dma_is_idle(chan)) {
+ spin_lock_bh(&chan->lock);
+ tsi721_advance_work(chan);
+ spin_unlock_bh(&chan->lock);
+ } else
+ dev_dbg(dchan->device->dev,
+ "%s: DMA channel still busy\n", __func__);
+}
+
+static
+struct dma_async_tx_descriptor *tsi721_prep_slave_sg(struct dma_chan *dchan,
+ struct scatterlist *sgl, unsigned int sg_len,
+ enum dma_data_direction direction, unsigned long flags)
+{
+ struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan);
+ struct tsi721_tx_desc *desc = NULL;
+ struct tsi721_tx_desc *first = NULL;
+ struct scatterlist *sg;
+ struct rio_dma_ext *rext = dchan->private;
+ u64 rio_addr = rext->rio_addr; /* FIXME: assuming 64-bit rio_addr for now */
+ unsigned int i;
+ u32 sys_size = dma_to_mport(dchan->device)->sys_size;
+ enum dma_rtype rtype;
+
+ if (!sgl || !sg_len) {
+ dev_err(dchan->device->dev, "%s: No SG list\n", __func__);
+ return NULL;
+ }
+
+ if (direction == DMA_FROM_DEVICE)
+ rtype = NREAD;
+ else if (direction == DMA_TO_DEVICE) {
+ switch (rext->wr_type) {
+ case RDW_ALL_NWRITE:
+ rtype = ALL_NWRITE;
+ break;
+ case RDW_ALL_NWRITE_R:
+ rtype = ALL_NWRITE_R;
+ break;
+ case RDW_LAST_NWRITE_R:
+ default:
+ rtype = LAST_NWRITE_R;
+ break;
+ }
+ } else {
+ dev_err(dchan->device->dev,
+ "%s: Unsupported DMA direction option\n", __func__);
+ return NULL;
+ }
+
+ for_each_sg(sgl, sg, sg_len, i) {
+ int err;
+
+ dev_dbg(dchan->device->dev, "%s: sg #%d\n", __func__, i);
+ desc = tsi721_desc_get(bdma_chan);
+ if (!desc) {
+ dev_err(dchan->device->dev,
+ "Not enough descriptors available\n");
+ goto err_desc_get;
+ }
+
+ if (sg_is_last(sg))
+ desc->interrupt = (flags & DMA_PREP_INTERRUPT) != 0;
+ else
+ desc->interrupt = false;
+
+ desc->destid = rext->destid;
+ desc->rio_addr = rio_addr;
+ desc->rio_addr_u = 0;
+
+ err = tsi721_fill_desc(bdma_chan, desc, sg, rtype, sys_size);
+ if (err) {
+ dev_err(dchan->device->dev,
+ "Failed to build desc: %d\n", err);
+ goto err_desc_get;
+ }
+
+ rio_addr += sg_dma_len(sg);
+
+ if (!first)
+ first = desc;
+ else
+ list_add_tail(&desc->desc_node, &first->tx_list);
+ }
+
+ first->txd.cookie = -EBUSY;
+ desc->txd.flags = flags;
+
+ return &first->txd;
+
+err_desc_get:
+ tsi721_desc_put(bdma_chan, first);
+ return NULL;
+}
+
+static int tsi721_device_control(struct dma_chan *dchan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ struct tsi721_bdma_chan *chan = to_tsi721_chan(dchan);
+ struct tsi721_tx_desc *desc, *_d;
+ LIST_HEAD(list);
+
+ dev_dbg(dchan->device->dev, "%s: Entry\n", __func__);
+
+ if (cmd != DMA_TERMINATE_ALL)
+ return -ENXIO;
+
+ spin_lock_bh(&chan->lock);
+
+ /* make sure to stop the transfer */
+ iowrite32(TSI721_DMAC_CTL_SUSP, chan->regs + TSI721_DMAC_CTL);
+
+ list_splice_init(&chan->active_list, &list);
+ list_splice_init(&chan->queue, &list);
+
+ list_for_each_entry_safe(desc, _d, &list, desc_node)
+ tsi721_dma_chain_complete(chan, desc);
+
+ spin_unlock_bh(&chan->lock);
+
+ return 0;
+}
+
+int __devinit tsi721_register_dma(struct tsi721_device *priv)
+{
+ int i;
+ int nr_channels = TSI721_DMA_MAXCH;
+ int err;
+ struct rio_mport *mport = priv->mport;
+
+ mport->dma.dev = &priv->pdev->dev;
+ mport->dma.chancnt = nr_channels;
+
+ INIT_LIST_HEAD(&mport->dma.channels);
+
+ for (i = 0; i < nr_channels; i++) {
+ struct tsi721_bdma_chan *bdma_chan = &priv->bdma[i];
+
+ if (i == TSI721_DMACH_MAINT)
+ continue;
+
+ bdma_chan->bd_num = 64;
+ bdma_chan->regs = priv->regs + TSI721_DMAC_BASE(i);
+
+ bdma_chan->dchan.device = &mport->dma;
+ bdma_chan->dchan.cookie = 1;
+ bdma_chan->dchan.chan_id = i;
+ bdma_chan->id = i;
+
+ spin_lock_init(&bdma_chan->lock);
+
+ INIT_LIST_HEAD(&bdma_chan->active_list);
+ INIT_LIST_HEAD(&bdma_chan->queue);
+ INIT_LIST_HEAD(&bdma_chan->free_list);
+
+ tasklet_init(&bdma_chan->tasklet, tsi721_dma_tasklet,
+ (unsigned long)bdma_chan);
+ list_add_tail(&bdma_chan->dchan.device_node,
+ &mport->dma.channels);
+ }
+
+ dma_cap_zero(mport->dma.cap_mask);
+ dma_cap_set(DMA_PRIVATE, mport->dma.cap_mask);
+ dma_cap_set(DMA_RAPIDIO, mport->dma.cap_mask);
+
+ mport->dma.device_alloc_chan_resources = tsi721_alloc_chan_resources;
+ mport->dma.device_free_chan_resources = tsi721_free_chan_resources;
+ mport->dma.device_tx_status = tsi721_tx_status;
+ mport->dma.device_issue_pending = tsi721_issue_pending;
+ mport->dma.device_prep_slave_sg = tsi721_prep_slave_sg;
+ mport->dma.device_control = tsi721_device_control;
+
+ err = dma_async_device_register(&mport->dma);
+ if (err)
+ dev_err(&priv->pdev->dev, "Failed to register DMA device\n");
+
+ return err;
+}
--
1.7.6


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  Last update: 2011-09-30 23:43    [from the cache]
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