* [PATCH v3 5/7] spi: dw-mid: move to use core SPI DMA mappings
[not found] ` <1425912531-23457-1-git-send-email-andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
` (3 preceding siblings ...)
2015-03-09 14:48 ` [PATCH v3 4/7] spi: dw-mid: clear ongoing DMA transfers on timeout Andy Shevchenko
@ 2015-03-09 14:48 ` Andy Shevchenko
2015-03-09 14:48 ` [PATCH v3 6/7] spi: dw-mid: convert to use dw_dmac instead of intel_mid_dma Andy Shevchenko
2015-03-09 14:48 ` [PATCH v3 7/7] dmaengine: intel-mid-dma: remove the driver Andy Shevchenko
6 siblings, 0 replies; 11+ messages in thread
From: Andy Shevchenko @ 2015-03-09 14:48 UTC (permalink / raw)
To: Mark Brown, linux-spi-u79uwXL29TY76Z2rM5mHXA; +Cc: Andy Shevchenko
SPI core has a comprehensive function set to map and unmap a message when it's
needed. This patch converts driver to use that advantage.
Signed-off-by: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
drivers/spi/spi-dw-mid.c | 52 ++++++++++++++++++++++++++++--------------------
drivers/spi/spi-dw.c | 40 +++++++------------------------------
drivers/spi/spi-dw.h | 17 ++++++----------
3 files changed, 43 insertions(+), 66 deletions(-)
diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c
index e614190..599dad4 100644
--- a/drivers/spi/spi-dw-mid.c
+++ b/drivers/spi/spi-dw-mid.c
@@ -69,6 +69,7 @@ static int mid_spi_dma_init(struct dw_spi *dws)
rxs->hs_mode = LNW_DMA_HW_HS;
rxs->cfg_mode = LNW_DMA_PER_TO_MEM;
dws->rxchan->private = rxs;
+ dws->master->dma_rx = dws->rxchan;
/* 2. Init tx channel */
dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, dws);
@@ -78,6 +79,7 @@ static int mid_spi_dma_init(struct dw_spi *dws)
txs->hs_mode = LNW_DMA_HW_HS;
txs->cfg_mode = LNW_DMA_MEM_TO_PER;
dws->txchan->private = txs;
+ dws->master->dma_tx = dws->txchan;
dws->dma_inited = 1;
return 0;
@@ -116,6 +118,17 @@ static irqreturn_t dma_transfer(struct dw_spi *dws)
return IRQ_HANDLED;
}
+static bool mid_spi_can_dma(struct spi_master *master, struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct dw_spi *dws = spi_master_get_devdata(master);
+
+ if (!dws->dma_inited)
+ return false;
+
+ return xfer->len > dws->fifo_len;
+}
+
static enum dma_slave_buswidth convert_dma_width(u32 dma_width) {
if (dma_width == 1)
return DMA_SLAVE_BUSWIDTH_1_BYTE;
@@ -139,12 +152,13 @@ static void dw_spi_dma_tx_done(void *arg)
spi_finalize_current_transfer(dws->master);
}
-static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws)
+static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws,
+ struct spi_transfer *xfer)
{
struct dma_slave_config txconf;
struct dma_async_tx_descriptor *txdesc;
- if (!dws->tx_dma)
+ if (!xfer->tx_buf)
return NULL;
txconf.direction = DMA_MEM_TO_DEV;
@@ -156,13 +170,9 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws)
dmaengine_slave_config(dws->txchan, &txconf);
- memset(&dws->tx_sgl, 0, sizeof(dws->tx_sgl));
- dws->tx_sgl.dma_address = dws->tx_dma;
- dws->tx_sgl.length = dws->len;
-
txdesc = dmaengine_prep_slave_sg(dws->txchan,
- &dws->tx_sgl,
- 1,
+ xfer->tx_sg.sgl,
+ xfer->tx_sg.nents,
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!txdesc)
@@ -188,12 +198,13 @@ static void dw_spi_dma_rx_done(void *arg)
spi_finalize_current_transfer(dws->master);
}
-static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws)
+static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws,
+ struct spi_transfer *xfer)
{
struct dma_slave_config rxconf;
struct dma_async_tx_descriptor *rxdesc;
- if (!dws->rx_dma)
+ if (!xfer->rx_buf)
return NULL;
rxconf.direction = DMA_DEV_TO_MEM;
@@ -205,13 +216,9 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws)
dmaengine_slave_config(dws->rxchan, &rxconf);
- memset(&dws->rx_sgl, 0, sizeof(dws->rx_sgl));
- dws->rx_sgl.dma_address = dws->rx_dma;
- dws->rx_sgl.length = dws->len;
-
rxdesc = dmaengine_prep_slave_sg(dws->rxchan,
- &dws->rx_sgl,
- 1,
+ xfer->rx_sg.sgl,
+ xfer->rx_sg.nents,
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!rxdesc)
@@ -223,16 +230,16 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws)
return rxdesc;
}
-static int mid_spi_dma_setup(struct dw_spi *dws)
+static int mid_spi_dma_setup(struct dw_spi *dws, struct spi_transfer *xfer)
{
u16 dma_ctrl = 0;
dw_writew(dws, DW_SPI_DMARDLR, 0xf);
dw_writew(dws, DW_SPI_DMATDLR, 0x10);
- if (dws->tx_dma)
+ if (xfer->tx_buf)
dma_ctrl |= SPI_DMA_TDMAE;
- if (dws->rx_dma)
+ if (xfer->rx_buf)
dma_ctrl |= SPI_DMA_RDMAE;
dw_writew(dws, DW_SPI_DMACR, dma_ctrl);
@@ -244,15 +251,15 @@ static int mid_spi_dma_setup(struct dw_spi *dws)
return 0;
}
-static int mid_spi_dma_transfer(struct dw_spi *dws)
+static int mid_spi_dma_transfer(struct dw_spi *dws, struct spi_transfer *xfer)
{
struct dma_async_tx_descriptor *txdesc, *rxdesc;
/* Prepare the TX dma transfer */
- txdesc = dw_spi_dma_prepare_tx(dws);
+ txdesc = dw_spi_dma_prepare_tx(dws, xfer);
/* Prepare the RX dma transfer */
- rxdesc = dw_spi_dma_prepare_rx(dws);
+ rxdesc = dw_spi_dma_prepare_rx(dws, xfer);
/* rx must be started before tx due to spi instinct */
if (rxdesc) {
@@ -286,6 +293,7 @@ static struct dw_spi_dma_ops mid_dma_ops = {
.dma_init = mid_spi_dma_init,
.dma_exit = mid_spi_dma_exit,
.dma_setup = mid_spi_dma_setup,
+ .can_dma = mid_spi_can_dma,
.dma_transfer = mid_spi_dma_transfer,
.dma_stop = mid_spi_dma_stop,
};
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index d53cffe..2437bfc 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -217,32 +217,6 @@ static void dw_reader(struct dw_spi *dws)
}
}
-/*
- * Note: first step is the protocol driver prepares
- * a dma-capable memory, and this func just need translate
- * the virt addr to physical
- */
-static int map_dma_buffers(struct spi_master *master,
- struct spi_device *spi, struct spi_transfer *transfer)
-{
- struct dw_spi *dws = spi_master_get_devdata(master);
- struct chip_data *chip = spi_get_ctldata(spi);
-
- if (!master->cur_msg->is_dma_mapped
- || !dws->dma_inited
- || !chip->enable_dma
- || !dws->dma_ops)
- return 0;
-
- if (transfer->tx_dma)
- dws->tx_dma = transfer->tx_dma;
-
- if (transfer->rx_dma)
- dws->rx_dma = transfer->rx_dma;
-
- return 1;
-}
-
static void int_error_stop(struct dw_spi *dws, const char *msg)
{
spi_reset_chip(dws);
@@ -322,11 +296,10 @@ static int dw_spi_transfer_one(struct spi_master *master,
u32 cr0 = 0;
int ret;
+ dws->dma_mapped = 0;
dws->n_bytes = chip->n_bytes;
dws->dma_width = chip->dma_width;
- dws->rx_dma = transfer->rx_dma;
- dws->tx_dma = transfer->tx_dma;
dws->tx = (void *)transfer->tx_buf;
dws->tx_end = dws->tx + transfer->len;
dws->rx = transfer->rx_buf;
@@ -386,7 +359,8 @@ static int dw_spi_transfer_one(struct spi_master *master,
dw_writew(dws, DW_SPI_CTRL0, cr0);
/* Check if current transfer is a DMA transaction */
- dws->dma_mapped = map_dma_buffers(master, spi, transfer);
+ if (master->can_dma && master->can_dma(master, spi, transfer))
+ dws->dma_mapped = master->cur_msg_mapped;
/* For poll mode just disable all interrupts */
spi_mask_intr(dws, 0xff);
@@ -396,7 +370,7 @@ static int dw_spi_transfer_one(struct spi_master *master,
* we only need set the TXEI IRQ, as TX/RX always happen syncronizely
*/
if (dws->dma_mapped) {
- ret = dws->dma_ops->dma_setup(dws);
+ ret = dws->dma_ops->dma_setup(dws, transfer);
if (ret < 0) {
spi_enable_chip(dws, 1);
return ret;
@@ -416,7 +390,7 @@ static int dw_spi_transfer_one(struct spi_master *master,
spi_enable_chip(dws, 1);
if (dws->dma_mapped) {
- ret = dws->dma_ops->dma_transfer(dws);
+ ret = dws->dma_ops->dma_transfer(dws, transfer);
if (ret < 0)
return ret;
}
@@ -470,8 +444,6 @@ static int dw_spi_setup(struct spi_device *spi)
chip->rx_threshold = 0;
chip->tx_threshold = 0;
-
- chip->enable_dma = chip_info->enable_dma;
}
if (spi->bits_per_word == 8) {
@@ -584,6 +556,8 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
if (ret) {
dev_warn(dev, "DMA init failed\n");
dws->dma_inited = 0;
+ } else {
+ master->can_dma = dws->dma_ops->can_dma;
}
}
diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
index 7f130bd..f298df5 100644
--- a/drivers/spi/spi-dw.h
+++ b/drivers/spi/spi-dw.h
@@ -91,8 +91,10 @@ struct dw_spi;
struct dw_spi_dma_ops {
int (*dma_init)(struct dw_spi *dws);
void (*dma_exit)(struct dw_spi *dws);
- int (*dma_setup)(struct dw_spi *dws);
- int (*dma_transfer)(struct dw_spi *dws);
+ int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer);
+ bool (*can_dma)(struct spi_master *master, struct spi_device *spi,
+ struct spi_transfer *xfer);
+ int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer);
void (*dma_stop)(struct dw_spi *dws);
};
@@ -117,20 +119,14 @@ struct dw_spi {
void *rx;
void *rx_end;
int dma_mapped;
- dma_addr_t rx_dma;
- dma_addr_t tx_dma;
- size_t rx_map_len;
- size_t tx_map_len;
u8 n_bytes; /* current is a 1/2 bytes op */
u32 dma_width;
irqreturn_t (*transfer_handler)(struct dw_spi *dws);
- /* Dma info */
+ /* DMA info */
int dma_inited;
struct dma_chan *txchan;
- struct scatterlist tx_sgl;
struct dma_chan *rxchan;
- struct scatterlist rx_sgl;
unsigned long dma_chan_busy;
struct device *dma_dev;
dma_addr_t dma_addr; /* phy address of the Data register */
@@ -206,14 +202,13 @@ static inline void spi_reset_chip(struct dw_spi *dws)
/*
* Each SPI slave device to work with dw_api controller should
- * has such a structure claiming its working mode (PIO/DMA etc),
+ * has such a structure claiming its working mode (poll or PIO/DMA),
* which can be save in the "controller_data" member of the
* struct spi_device.
*/
struct dw_spi_chip {
u8 poll_mode; /* 1 for controller polling mode */
u8 type; /* SPI/SSP/MicroWire */
- u8 enable_dma;
void (*cs_control)(u32 command);
};
--
2.1.4
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^ permalink raw reply related [flat|nested] 11+ messages in thread* [PATCH v3 7/7] dmaengine: intel-mid-dma: remove the driver
[not found] ` <1425912531-23457-1-git-send-email-andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
` (5 preceding siblings ...)
2015-03-09 14:48 ` [PATCH v3 6/7] spi: dw-mid: convert to use dw_dmac instead of intel_mid_dma Andy Shevchenko
@ 2015-03-09 14:48 ` Andy Shevchenko
[not found] ` <1425912531-23457-8-git-send-email-andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
6 siblings, 1 reply; 11+ messages in thread
From: Andy Shevchenko @ 2015-03-09 14:48 UTC (permalink / raw)
To: Mark Brown, linux-spi-u79uwXL29TY76Z2rM5mHXA
Cc: Andy Shevchenko, Vinod Koul, dmaengine-u79uwXL29TY76Z2rM5mHXA
Since the last and the only user of this driver is converted to use dw_dmac we
can remove driver from the tree.
Moreover, besides the driver is unmaintained a long time, it serves for the
DesignWare DMA IP, for which we have already driver in the tree.
Cc: Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
drivers/dma/Kconfig | 13 -
drivers/dma/Makefile | 1 -
drivers/dma/intel_mid_dma.c | 1447 --------------------------------------
drivers/dma/intel_mid_dma_regs.h | 299 --------
include/linux/intel_mid_dma.h | 76 --
5 files changed, 1836 deletions(-)
delete mode 100644 drivers/dma/intel_mid_dma.c
delete mode 100644 drivers/dma/intel_mid_dma_regs.h
delete mode 100644 include/linux/intel_mid_dma.h
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 074ffad..91eced0 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -51,19 +51,6 @@ config INTEL_MIC_X100_DMA
OS and tools for MIC to use with this driver are available from
<http://software.intel.com/en-us/mic-developer>.
-config INTEL_MID_DMAC
- tristate "Intel MID DMA support for Peripheral DMA controllers"
- depends on PCI && X86
- select DMA_ENGINE
- default n
- help
- Enable support for the Intel(R) MID DMA engine present
- in Intel MID chipsets.
-
- Say Y here if you have such a chipset.
-
- If unsure, say N.
-
config ASYNC_TX_ENABLE_CHANNEL_SWITCH
bool
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index bf44858..7e8301c 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -6,7 +6,6 @@ obj-$(CONFIG_DMA_VIRTUAL_CHANNELS) += virt-dma.o
obj-$(CONFIG_DMA_ACPI) += acpi-dma.o
obj-$(CONFIG_DMA_OF) += of-dma.o
-obj-$(CONFIG_INTEL_MID_DMAC) += intel_mid_dma.o
obj-$(CONFIG_DMATEST) += dmatest.o
obj-$(CONFIG_INTEL_IOATDMA) += ioat/
obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o
diff --git a/drivers/dma/intel_mid_dma.c b/drivers/dma/intel_mid_dma.c
deleted file mode 100644
index 5aaead9..0000000
--- a/drivers/dma/intel_mid_dma.c
+++ /dev/null
@@ -1,1447 +0,0 @@
-/*
- * intel_mid_dma.c - Intel Langwell DMA Drivers
- *
- * Copyright (C) 2008-10 Intel Corp
- * Author: Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
- * The driver design is based on dw_dmac driver
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * 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; version 2 of the License.
- *
- * 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/pci.h>
-#include <linux/interrupt.h>
-#include <linux/pm_runtime.h>
-#include <linux/intel_mid_dma.h>
-#include <linux/module.h>
-
-#include "dmaengine.h"
-
-#define MAX_CHAN 4 /*max ch across controllers*/
-#include "intel_mid_dma_regs.h"
-
-#define INTEL_MID_DMAC1_ID 0x0814
-#define INTEL_MID_DMAC2_ID 0x0813
-#define INTEL_MID_GP_DMAC2_ID 0x0827
-#define INTEL_MFLD_DMAC1_ID 0x0830
-#define LNW_PERIPHRAL_MASK_BASE 0xFFAE8008
-#define LNW_PERIPHRAL_MASK_SIZE 0x10
-#define LNW_PERIPHRAL_STATUS 0x0
-#define LNW_PERIPHRAL_MASK 0x8
-
-struct intel_mid_dma_probe_info {
- u8 max_chan;
- u8 ch_base;
- u16 block_size;
- u32 pimr_mask;
-};
-
-#define INFO(_max_chan, _ch_base, _block_size, _pimr_mask) \
- ((kernel_ulong_t)&(struct intel_mid_dma_probe_info) { \
- .max_chan = (_max_chan), \
- .ch_base = (_ch_base), \
- .block_size = (_block_size), \
- .pimr_mask = (_pimr_mask), \
- })
-
-/*****************************************************************************
-Utility Functions*/
-/**
- * get_ch_index - convert status to channel
- * @status: status mask
- * @base: dma ch base value
- *
- * Modify the status mask and return the channel index needing
- * attention (or -1 if neither)
- */
-static int get_ch_index(int *status, unsigned int base)
-{
- int i;
- for (i = 0; i < MAX_CHAN; i++) {
- if (*status & (1 << (i + base))) {
- *status = *status & ~(1 << (i + base));
- pr_debug("MDMA: index %d New status %x\n", i, *status);
- return i;
- }
- }
- return -1;
-}
-
-/**
- * get_block_ts - calculates dma transaction length
- * @len: dma transfer length
- * @tx_width: dma transfer src width
- * @block_size: dma controller max block size
- *
- * Based on src width calculate the DMA trsaction length in data items
- * return data items or FFFF if exceeds max length for block
- */
-static int get_block_ts(int len, int tx_width, int block_size)
-{
- int byte_width = 0, block_ts = 0;
-
- switch (tx_width) {
- case DMA_SLAVE_BUSWIDTH_1_BYTE:
- byte_width = 1;
- break;
- case DMA_SLAVE_BUSWIDTH_2_BYTES:
- byte_width = 2;
- break;
- case DMA_SLAVE_BUSWIDTH_4_BYTES:
- default:
- byte_width = 4;
- break;
- }
-
- block_ts = len/byte_width;
- if (block_ts > block_size)
- block_ts = 0xFFFF;
- return block_ts;
-}
-
-/*****************************************************************************
-DMAC1 interrupt Functions*/
-
-/**
- * dmac1_mask_periphral_intr - mask the periphral interrupt
- * @mid: dma device for which masking is required
- *
- * Masks the DMA periphral interrupt
- * this is valid for DMAC1 family controllers only
- * This controller should have periphral mask registers already mapped
- */
-static void dmac1_mask_periphral_intr(struct middma_device *mid)
-{
- u32 pimr;
-
- if (mid->pimr_mask) {
- pimr = readl(mid->mask_reg + LNW_PERIPHRAL_MASK);
- pimr |= mid->pimr_mask;
- writel(pimr, mid->mask_reg + LNW_PERIPHRAL_MASK);
- }
- return;
-}
-
-/**
- * dmac1_unmask_periphral_intr - unmask the periphral interrupt
- * @midc: dma channel for which masking is required
- *
- * UnMasks the DMA periphral interrupt,
- * this is valid for DMAC1 family controllers only
- * This controller should have periphral mask registers already mapped
- */
-static void dmac1_unmask_periphral_intr(struct intel_mid_dma_chan *midc)
-{
- u32 pimr;
- struct middma_device *mid = to_middma_device(midc->chan.device);
-
- if (mid->pimr_mask) {
- pimr = readl(mid->mask_reg + LNW_PERIPHRAL_MASK);
- pimr &= ~mid->pimr_mask;
- writel(pimr, mid->mask_reg + LNW_PERIPHRAL_MASK);
- }
- return;
-}
-
-/**
- * enable_dma_interrupt - enable the periphral interrupt
- * @midc: dma channel for which enable interrupt is required
- *
- * Enable the DMA periphral interrupt,
- * this is valid for DMAC1 family controllers only
- * This controller should have periphral mask registers already mapped
- */
-static void enable_dma_interrupt(struct intel_mid_dma_chan *midc)
-{
- dmac1_unmask_periphral_intr(midc);
-
- /*en ch interrupts*/
- iowrite32(UNMASK_INTR_REG(midc->ch_id), midc->dma_base + MASK_TFR);
- iowrite32(UNMASK_INTR_REG(midc->ch_id), midc->dma_base + MASK_ERR);
- return;
-}
-
-/**
- * disable_dma_interrupt - disable the periphral interrupt
- * @midc: dma channel for which disable interrupt is required
- *
- * Disable the DMA periphral interrupt,
- * this is valid for DMAC1 family controllers only
- * This controller should have periphral mask registers already mapped
- */
-static void disable_dma_interrupt(struct intel_mid_dma_chan *midc)
-{
- /*Check LPE PISR, make sure fwd is disabled*/
- iowrite32(MASK_INTR_REG(midc->ch_id), midc->dma_base + MASK_BLOCK);
- iowrite32(MASK_INTR_REG(midc->ch_id), midc->dma_base + MASK_TFR);
- iowrite32(MASK_INTR_REG(midc->ch_id), midc->dma_base + MASK_ERR);
- return;
-}
-
-/*****************************************************************************
-DMA channel helper Functions*/
-/**
- * mid_desc_get - get a descriptor
- * @midc: dma channel for which descriptor is required
- *
- * Obtain a descriptor for the channel. Returns NULL if none are free.
- * Once the descriptor is returned it is private until put on another
- * list or freed
- */
-static struct intel_mid_dma_desc *midc_desc_get(struct intel_mid_dma_chan *midc)
-{
- struct intel_mid_dma_desc *desc, *_desc;
- struct intel_mid_dma_desc *ret = NULL;
-
- spin_lock_bh(&midc->lock);
- list_for_each_entry_safe(desc, _desc, &midc->free_list, desc_node) {
- if (async_tx_test_ack(&desc->txd)) {
- list_del(&desc->desc_node);
- ret = desc;
- break;
- }
- }
- spin_unlock_bh(&midc->lock);
- return ret;
-}
-
-/**
- * mid_desc_put - put a descriptor
- * @midc: dma channel for which descriptor is required
- * @desc: descriptor to put
- *
- * Return a descriptor from lwn_desc_get back to the free pool
- */
-static void midc_desc_put(struct intel_mid_dma_chan *midc,
- struct intel_mid_dma_desc *desc)
-{
- if (desc) {
- spin_lock_bh(&midc->lock);
- list_add_tail(&desc->desc_node, &midc->free_list);
- spin_unlock_bh(&midc->lock);
- }
-}
-/**
- * midc_dostart - begin a DMA transaction
- * @midc: channel for which txn is to be started
- * @first: first descriptor of series
- *
- * Load a transaction into the engine. This must be called with midc->lock
- * held and bh disabled.
- */
-static void midc_dostart(struct intel_mid_dma_chan *midc,
- struct intel_mid_dma_desc *first)
-{
- struct middma_device *mid = to_middma_device(midc->chan.device);
-
- /* channel is idle */
- if (midc->busy && test_ch_en(midc->dma_base, midc->ch_id)) {
- /*error*/
- pr_err("ERR_MDMA: channel is busy in start\n");
- /* The tasklet will hopefully advance the queue... */
- return;
- }
- midc->busy = true;
- /*write registers and en*/
- iowrite32(first->sar, midc->ch_regs + SAR);
- iowrite32(first->dar, midc->ch_regs + DAR);
- iowrite32(first->lli_phys, midc->ch_regs + LLP);
- iowrite32(first->cfg_hi, midc->ch_regs + CFG_HIGH);
- iowrite32(first->cfg_lo, midc->ch_regs + CFG_LOW);
- iowrite32(first->ctl_lo, midc->ch_regs + CTL_LOW);
- iowrite32(first->ctl_hi, midc->ch_regs + CTL_HIGH);
- pr_debug("MDMA:TX SAR %x,DAR %x,CFGL %x,CFGH %x,CTLH %x, CTLL %x\n",
- (int)first->sar, (int)first->dar, first->cfg_hi,
- first->cfg_lo, first->ctl_hi, first->ctl_lo);
- first->status = DMA_IN_PROGRESS;
-
- iowrite32(ENABLE_CHANNEL(midc->ch_id), mid->dma_base + DMA_CHAN_EN);
-}
-
-/**
- * midc_descriptor_complete - process completed descriptor
- * @midc: channel owning the descriptor
- * @desc: the descriptor itself
- *
- * Process a completed descriptor and perform any callbacks upon
- * the completion. The completion handling drops the lock during the
- * callbacks but must be called with the lock held.
- */
-static void midc_descriptor_complete(struct intel_mid_dma_chan *midc,
- struct intel_mid_dma_desc *desc)
- __releases(&midc->lock) __acquires(&midc->lock)
-{
- struct dma_async_tx_descriptor *txd = &desc->txd;
- dma_async_tx_callback callback_txd = NULL;
- struct intel_mid_dma_lli *llitem;
- void *param_txd = NULL;
-
- dma_cookie_complete(txd);
- callback_txd = txd->callback;
- param_txd = txd->callback_param;
-
- if (desc->lli != NULL) {
- /*clear the DONE bit of completed LLI in memory*/
- llitem = desc->lli + desc->current_lli;
- llitem->ctl_hi &= CLEAR_DONE;
- if (desc->current_lli < desc->lli_length-1)
- (desc->current_lli)++;
- else
- desc->current_lli = 0;
- }
- spin_unlock_bh(&midc->lock);
- if (callback_txd) {
- pr_debug("MDMA: TXD callback set ... calling\n");
- callback_txd(param_txd);
- }
- if (midc->raw_tfr) {
- desc->status = DMA_COMPLETE;
- if (desc->lli != NULL) {
- pci_pool_free(desc->lli_pool, desc->lli,
- desc->lli_phys);
- pci_pool_destroy(desc->lli_pool);
- desc->lli = NULL;
- }
- list_move(&desc->desc_node, &midc->free_list);
- midc->busy = false;
- }
- spin_lock_bh(&midc->lock);
-
-}
-/**
- * midc_scan_descriptors - check the descriptors in channel
- * mark completed when tx is completete
- * @mid: device
- * @midc: channel to scan
- *
- * Walk the descriptor chain for the device and process any entries
- * that are complete.
- */
-static void midc_scan_descriptors(struct middma_device *mid,
- struct intel_mid_dma_chan *midc)
-{
- struct intel_mid_dma_desc *desc = NULL, *_desc = NULL;
-
- /*tx is complete*/
- list_for_each_entry_safe(desc, _desc, &midc->active_list, desc_node) {
- if (desc->status == DMA_IN_PROGRESS)
- midc_descriptor_complete(midc, desc);
- }
- return;
- }
-/**
- * midc_lli_fill_sg - Helper function to convert
- * SG list to Linked List Items.
- *@midc: Channel
- *@desc: DMA descriptor
- *@sglist: Pointer to SG list
- *@sglen: SG list length
- *@flags: DMA transaction flags
- *
- * Walk through the SG list and convert the SG list into Linked
- * List Items (LLI).
- */
-static int midc_lli_fill_sg(struct intel_mid_dma_chan *midc,
- struct intel_mid_dma_desc *desc,
- struct scatterlist *sglist,
- unsigned int sglen,
- unsigned int flags)
-{
- struct intel_mid_dma_slave *mids;
- struct scatterlist *sg;
- dma_addr_t lli_next, sg_phy_addr;
- struct intel_mid_dma_lli *lli_bloc_desc;
- union intel_mid_dma_ctl_lo ctl_lo;
- union intel_mid_dma_ctl_hi ctl_hi;
- int i;
-
- pr_debug("MDMA: Entered midc_lli_fill_sg\n");
- mids = midc->mid_slave;
-
- lli_bloc_desc = desc->lli;
- lli_next = desc->lli_phys;
-
- ctl_lo.ctl_lo = desc->ctl_lo;
- ctl_hi.ctl_hi = desc->ctl_hi;
- for_each_sg(sglist, sg, sglen, i) {
- /*Populate CTL_LOW and LLI values*/
- if (i != sglen - 1) {
- lli_next = lli_next +
- sizeof(struct intel_mid_dma_lli);
- } else {
- /*Check for circular list, otherwise terminate LLI to ZERO*/
- if (flags & DMA_PREP_CIRCULAR_LIST) {
- pr_debug("MDMA: LLI is configured in circular mode\n");
- lli_next = desc->lli_phys;
- } else {
- lli_next = 0;
- ctl_lo.ctlx.llp_dst_en = 0;
- ctl_lo.ctlx.llp_src_en = 0;
- }
- }
- /*Populate CTL_HI values*/
- ctl_hi.ctlx.block_ts = get_block_ts(sg_dma_len(sg),
- desc->width,
- midc->dma->block_size);
- /*Populate SAR and DAR values*/
- sg_phy_addr = sg_dma_address(sg);
- if (desc->dirn == DMA_MEM_TO_DEV) {
- lli_bloc_desc->sar = sg_phy_addr;
- lli_bloc_desc->dar = mids->dma_slave.dst_addr;
- } else if (desc->dirn == DMA_DEV_TO_MEM) {
- lli_bloc_desc->sar = mids->dma_slave.src_addr;
- lli_bloc_desc->dar = sg_phy_addr;
- }
- /*Copy values into block descriptor in system memroy*/
- lli_bloc_desc->llp = lli_next;
- lli_bloc_desc->ctl_lo = ctl_lo.ctl_lo;
- lli_bloc_desc->ctl_hi = ctl_hi.ctl_hi;
-
- lli_bloc_desc++;
- }
- /*Copy very first LLI values to descriptor*/
- desc->ctl_lo = desc->lli->ctl_lo;
- desc->ctl_hi = desc->lli->ctl_hi;
- desc->sar = desc->lli->sar;
- desc->dar = desc->lli->dar;
-
- return 0;
-}
-/*****************************************************************************
-DMA engine callback Functions*/
-/**
- * intel_mid_dma_tx_submit - callback to submit DMA transaction
- * @tx: dma engine descriptor
- *
- * Submit the DMA transaction for this descriptor, start if ch idle
- */
-static dma_cookie_t intel_mid_dma_tx_submit(struct dma_async_tx_descriptor *tx)
-{
- struct intel_mid_dma_desc *desc = to_intel_mid_dma_desc(tx);
- struct intel_mid_dma_chan *midc = to_intel_mid_dma_chan(tx->chan);
- dma_cookie_t cookie;
-
- spin_lock_bh(&midc->lock);
- cookie = dma_cookie_assign(tx);
-
- if (list_empty(&midc->active_list))
- list_add_tail(&desc->desc_node, &midc->active_list);
- else
- list_add_tail(&desc->desc_node, &midc->queue);
-
- midc_dostart(midc, desc);
- spin_unlock_bh(&midc->lock);
-
- return cookie;
-}
-
-/**
- * intel_mid_dma_issue_pending - callback to issue pending txn
- * @chan: chan where pending trascation needs to be checked and submitted
- *
- * Call for scan to issue pending descriptors
- */
-static void intel_mid_dma_issue_pending(struct dma_chan *chan)
-{
- struct intel_mid_dma_chan *midc = to_intel_mid_dma_chan(chan);
-
- spin_lock_bh(&midc->lock);
- if (!list_empty(&midc->queue))
- midc_scan_descriptors(to_middma_device(chan->device), midc);
- spin_unlock_bh(&midc->lock);
-}
-
-/**
- * intel_mid_dma_tx_status - Return status of txn
- * @chan: chan for where status needs to be checked
- * @cookie: cookie for txn
- * @txstate: DMA txn state
- *
- * Return status of DMA txn
- */
-static enum dma_status intel_mid_dma_tx_status(struct dma_chan *chan,
- dma_cookie_t cookie,
- struct dma_tx_state *txstate)
-{
- struct intel_mid_dma_chan *midc = to_intel_mid_dma_chan(chan);
- enum dma_status ret;
-
- ret = dma_cookie_status(chan, cookie, txstate);
- if (ret != DMA_COMPLETE) {
- spin_lock_bh(&midc->lock);
- midc_scan_descriptors(to_middma_device(chan->device), midc);
- spin_unlock_bh(&midc->lock);
-
- ret = dma_cookie_status(chan, cookie, txstate);
- }
-
- return ret;
-}
-
-static int intel_mid_dma_config(struct dma_chan *chan,
- struct dma_slave_config *slave)
-{
- struct intel_mid_dma_chan *midc = to_intel_mid_dma_chan(chan);
- struct intel_mid_dma_slave *mid_slave;
-
- BUG_ON(!midc);
- BUG_ON(!slave);
- pr_debug("MDMA: slave control called\n");
-
- mid_slave = to_intel_mid_dma_slave(slave);
-
- BUG_ON(!mid_slave);
-
- midc->mid_slave = mid_slave;
- return 0;
-}
-
-static int intel_mid_dma_terminate_all(struct dma_chan *chan)
-{
- struct intel_mid_dma_chan *midc = to_intel_mid_dma_chan(chan);
- struct middma_device *mid = to_middma_device(chan->device);
- struct intel_mid_dma_desc *desc, *_desc;
- union intel_mid_dma_cfg_lo cfg_lo;
-
- spin_lock_bh(&midc->lock);
- if (midc->busy == false) {
- spin_unlock_bh(&midc->lock);
- return 0;
- }
- /*Suspend and disable the channel*/
- cfg_lo.cfg_lo = ioread32(midc->ch_regs + CFG_LOW);
- cfg_lo.cfgx.ch_susp = 1;
- iowrite32(cfg_lo.cfg_lo, midc->ch_regs + CFG_LOW);
- iowrite32(DISABLE_CHANNEL(midc->ch_id), mid->dma_base + DMA_CHAN_EN);
- midc->busy = false;
- /* Disable interrupts */
- disable_dma_interrupt(midc);
- midc->descs_allocated = 0;
-
- spin_unlock_bh(&midc->lock);
- list_for_each_entry_safe(desc, _desc, &midc->active_list, desc_node) {
- if (desc->lli != NULL) {
- pci_pool_free(desc->lli_pool, desc->lli,
- desc->lli_phys);
- pci_pool_destroy(desc->lli_pool);
- desc->lli = NULL;
- }
- list_move(&desc->desc_node, &midc->free_list);
- }
- return 0;
-}
-
-
-/**
- * intel_mid_dma_prep_memcpy - Prep memcpy txn
- * @chan: chan for DMA transfer
- * @dest: destn address
- * @src: src address
- * @len: DMA transfer len
- * @flags: DMA flags
- *
- * Perform a DMA memcpy. Note we support slave periphral DMA transfers only
- * The periphral txn details should be filled in slave structure properly
- * Returns the descriptor for this txn
- */
-static struct dma_async_tx_descriptor *intel_mid_dma_prep_memcpy(
- struct dma_chan *chan, dma_addr_t dest,
- dma_addr_t src, size_t len, unsigned long flags)
-{
- struct intel_mid_dma_chan *midc;
- struct intel_mid_dma_desc *desc = NULL;
- struct intel_mid_dma_slave *mids;
- union intel_mid_dma_ctl_lo ctl_lo;
- union intel_mid_dma_ctl_hi ctl_hi;
- union intel_mid_dma_cfg_lo cfg_lo;
- union intel_mid_dma_cfg_hi cfg_hi;
- enum dma_slave_buswidth width;
-
- pr_debug("MDMA: Prep for memcpy\n");
- BUG_ON(!chan);
- if (!len)
- return NULL;
-
- midc = to_intel_mid_dma_chan(chan);
- BUG_ON(!midc);
-
- mids = midc->mid_slave;
- BUG_ON(!mids);
-
- pr_debug("MDMA:called for DMA %x CH %d Length %zu\n",
- midc->dma->pci_id, midc->ch_id, len);
- pr_debug("MDMA:Cfg passed Mode %x, Dirn %x, HS %x, Width %x\n",
- mids->cfg_mode, mids->dma_slave.direction,
- mids->hs_mode, mids->dma_slave.src_addr_width);
-
- /*calculate CFG_LO*/
- if (mids->hs_mode == LNW_DMA_SW_HS) {
- cfg_lo.cfg_lo = 0;
- cfg_lo.cfgx.hs_sel_dst = 1;
- cfg_lo.cfgx.hs_sel_src = 1;
- } else if (mids->hs_mode == LNW_DMA_HW_HS)
- cfg_lo.cfg_lo = 0x00000;
-
- /*calculate CFG_HI*/
- if (mids->cfg_mode == LNW_DMA_MEM_TO_MEM) {
- /*SW HS only*/
- cfg_hi.cfg_hi = 0;
- } else {
- cfg_hi.cfg_hi = 0;
- if (midc->dma->pimr_mask) {
- cfg_hi.cfgx.protctl = 0x0; /*default value*/
- cfg_hi.cfgx.fifo_mode = 1;
- if (mids->dma_slave.direction == DMA_MEM_TO_DEV) {
- cfg_hi.cfgx.src_per = 0;
- if (mids->device_instance == 0)
- cfg_hi.cfgx.dst_per = 3;
- if (mids->device_instance == 1)
- cfg_hi.cfgx.dst_per = 1;
- } else if (mids->dma_slave.direction == DMA_DEV_TO_MEM) {
- if (mids->device_instance == 0)
- cfg_hi.cfgx.src_per = 2;
- if (mids->device_instance == 1)
- cfg_hi.cfgx.src_per = 0;
- cfg_hi.cfgx.dst_per = 0;
- }
- } else {
- cfg_hi.cfgx.protctl = 0x1; /*default value*/
- cfg_hi.cfgx.src_per = cfg_hi.cfgx.dst_per =
- midc->ch_id - midc->dma->chan_base;
- }
- }
-
- /*calculate CTL_HI*/
- ctl_hi.ctlx.reser = 0;
- ctl_hi.ctlx.done = 0;
- width = mids->dma_slave.src_addr_width;
-
- ctl_hi.ctlx.block_ts = get_block_ts(len, width, midc->dma->block_size);
- pr_debug("MDMA:calc len %d for block size %d\n",
- ctl_hi.ctlx.block_ts, midc->dma->block_size);
- /*calculate CTL_LO*/
- ctl_lo.ctl_lo = 0;
- ctl_lo.ctlx.int_en = 1;
- ctl_lo.ctlx.dst_msize = mids->dma_slave.src_maxburst;
- ctl_lo.ctlx.src_msize = mids->dma_slave.dst_maxburst;
-
- /*
- * Here we need some translation from "enum dma_slave_buswidth"
- * to the format for our dma controller
- * standard intel_mid_dmac's format
- * 1 Byte 0b000
- * 2 Bytes 0b001
- * 4 Bytes 0b010
- */
- ctl_lo.ctlx.dst_tr_width = mids->dma_slave.dst_addr_width / 2;
- ctl_lo.ctlx.src_tr_width = mids->dma_slave.src_addr_width / 2;
-
- if (mids->cfg_mode == LNW_DMA_MEM_TO_MEM) {
- ctl_lo.ctlx.tt_fc = 0;
- ctl_lo.ctlx.sinc = 0;
- ctl_lo.ctlx.dinc = 0;
- } else {
- if (mids->dma_slave.direction == DMA_MEM_TO_DEV) {
- ctl_lo.ctlx.sinc = 0;
- ctl_lo.ctlx.dinc = 2;
- ctl_lo.ctlx.tt_fc = 1;
- } else if (mids->dma_slave.direction == DMA_DEV_TO_MEM) {
- ctl_lo.ctlx.sinc = 2;
- ctl_lo.ctlx.dinc = 0;
- ctl_lo.ctlx.tt_fc = 2;
- }
- }
-
- pr_debug("MDMA:Calc CTL LO %x, CTL HI %x, CFG LO %x, CFG HI %x\n",
- ctl_lo.ctl_lo, ctl_hi.ctl_hi, cfg_lo.cfg_lo, cfg_hi.cfg_hi);
-
- enable_dma_interrupt(midc);
-
- desc = midc_desc_get(midc);
- if (desc == NULL)
- goto err_desc_get;
- desc->sar = src;
- desc->dar = dest ;
- desc->len = len;
- desc->cfg_hi = cfg_hi.cfg_hi;
- desc->cfg_lo = cfg_lo.cfg_lo;
- desc->ctl_lo = ctl_lo.ctl_lo;
- desc->ctl_hi = ctl_hi.ctl_hi;
- desc->width = width;
- desc->dirn = mids->dma_slave.direction;
- desc->lli_phys = 0;
- desc->lli = NULL;
- desc->lli_pool = NULL;
- return &desc->txd;
-
-err_desc_get:
- pr_err("ERR_MDMA: Failed to get desc\n");
- midc_desc_put(midc, desc);
- return NULL;
-}
-/**
- * intel_mid_dma_prep_slave_sg - Prep slave sg txn
- * @chan: chan for DMA transfer
- * @sgl: scatter gather list
- * @sg_len: length of sg txn
- * @direction: DMA transfer dirtn
- * @flags: DMA flags
- * @context: transfer context (ignored)
- *
- * Prepares LLI based periphral transfer
- */
-static struct dma_async_tx_descriptor *intel_mid_dma_prep_slave_sg(
- struct dma_chan *chan, struct scatterlist *sgl,
- unsigned int sg_len, enum dma_transfer_direction direction,
- unsigned long flags, void *context)
-{
- struct intel_mid_dma_chan *midc = NULL;
- struct intel_mid_dma_slave *mids = NULL;
- struct intel_mid_dma_desc *desc = NULL;
- struct dma_async_tx_descriptor *txd = NULL;
- union intel_mid_dma_ctl_lo ctl_lo;
-
- pr_debug("MDMA: Prep for slave SG\n");
-
- if (!sg_len) {
- pr_err("MDMA: Invalid SG length\n");
- return NULL;
- }
- midc = to_intel_mid_dma_chan(chan);
- BUG_ON(!midc);
-
- mids = midc->mid_slave;
- BUG_ON(!mids);
-
- if (!midc->dma->pimr_mask) {
- /* We can still handle sg list with only one item */
- if (sg_len == 1) {
- txd = intel_mid_dma_prep_memcpy(chan,
- mids->dma_slave.dst_addr,
- mids->dma_slave.src_addr,
- sg_dma_len(sgl),
- flags);
- return txd;
- } else {
- pr_warn("MDMA: SG list is not supported by this controller\n");
- return NULL;
- }
- }
-
- pr_debug("MDMA: SG Length = %d, direction = %d, Flags = %#lx\n",
- sg_len, direction, flags);
-
- txd = intel_mid_dma_prep_memcpy(chan, 0, 0, sg_dma_len(sgl), flags);
- if (NULL == txd) {
- pr_err("MDMA: Prep memcpy failed\n");
- return NULL;
- }
-
- desc = to_intel_mid_dma_desc(txd);
- desc->dirn = direction;
- ctl_lo.ctl_lo = desc->ctl_lo;
- ctl_lo.ctlx.llp_dst_en = 1;
- ctl_lo.ctlx.llp_src_en = 1;
- desc->ctl_lo = ctl_lo.ctl_lo;
- desc->lli_length = sg_len;
- desc->current_lli = 0;
- /* DMA coherent memory pool for LLI descriptors*/
- desc->lli_pool = pci_pool_create("intel_mid_dma_lli_pool",
- midc->dma->pdev,
- (sizeof(struct intel_mid_dma_lli)*sg_len),
- 32, 0);
- if (NULL == desc->lli_pool) {
- pr_err("MID_DMA:LLI pool create failed\n");
- return NULL;
- }
-
- desc->lli = pci_pool_alloc(desc->lli_pool, GFP_KERNEL, &desc->lli_phys);
- if (!desc->lli) {
- pr_err("MID_DMA: LLI alloc failed\n");
- pci_pool_destroy(desc->lli_pool);
- return NULL;
- }
-
- midc_lli_fill_sg(midc, desc, sgl, sg_len, flags);
- if (flags & DMA_PREP_INTERRUPT) {
- iowrite32(UNMASK_INTR_REG(midc->ch_id),
- midc->dma_base + MASK_BLOCK);
- pr_debug("MDMA:Enabled Block interrupt\n");
- }
- return &desc->txd;
-}
-
-/**
- * intel_mid_dma_free_chan_resources - Frees dma resources
- * @chan: chan requiring attention
- *
- * Frees the allocated resources on this DMA chan
- */
-static void intel_mid_dma_free_chan_resources(struct dma_chan *chan)
-{
- struct intel_mid_dma_chan *midc = to_intel_mid_dma_chan(chan);
- struct middma_device *mid = to_middma_device(chan->device);
- struct intel_mid_dma_desc *desc, *_desc;
-
- if (true == midc->busy) {
- /*trying to free ch in use!!!!!*/
- pr_err("ERR_MDMA: trying to free ch in use\n");
- }
- spin_lock_bh(&midc->lock);
- midc->descs_allocated = 0;
- list_for_each_entry_safe(desc, _desc, &midc->active_list, desc_node) {
- list_del(&desc->desc_node);
- pci_pool_free(mid->dma_pool, desc, desc->txd.phys);
- }
- list_for_each_entry_safe(desc, _desc, &midc->free_list, desc_node) {
- list_del(&desc->desc_node);
- pci_pool_free(mid->dma_pool, desc, desc->txd.phys);
- }
- list_for_each_entry_safe(desc, _desc, &midc->queue, desc_node) {
- list_del(&desc->desc_node);
- pci_pool_free(mid->dma_pool, desc, desc->txd.phys);
- }
- spin_unlock_bh(&midc->lock);
- midc->in_use = false;
- midc->busy = false;
- /* Disable CH interrupts */
- iowrite32(MASK_INTR_REG(midc->ch_id), mid->dma_base + MASK_BLOCK);
- iowrite32(MASK_INTR_REG(midc->ch_id), mid->dma_base + MASK_ERR);
- pm_runtime_put(&mid->pdev->dev);
-}
-
-/**
- * intel_mid_dma_alloc_chan_resources - Allocate dma resources
- * @chan: chan requiring attention
- *
- * Allocates DMA resources on this chan
- * Return the descriptors allocated
- */
-static int intel_mid_dma_alloc_chan_resources(struct dma_chan *chan)
-{
- struct intel_mid_dma_chan *midc = to_intel_mid_dma_chan(chan);
- struct middma_device *mid = to_middma_device(chan->device);
- struct intel_mid_dma_desc *desc;
- dma_addr_t phys;
- int i = 0;
-
- pm_runtime_get_sync(&mid->pdev->dev);
-
- if (mid->state == SUSPENDED) {
- if (dma_resume(&mid->pdev->dev)) {
- pr_err("ERR_MDMA: resume failed");
- return -EFAULT;
- }
- }
-
- /* ASSERT: channel is idle */
- if (test_ch_en(mid->dma_base, midc->ch_id)) {
- /*ch is not idle*/
- pr_err("ERR_MDMA: ch not idle\n");
- pm_runtime_put(&mid->pdev->dev);
- return -EIO;
- }
- dma_cookie_init(chan);
-
- spin_lock_bh(&midc->lock);
- while (midc->descs_allocated < DESCS_PER_CHANNEL) {
- spin_unlock_bh(&midc->lock);
- desc = pci_pool_alloc(mid->dma_pool, GFP_KERNEL, &phys);
- if (!desc) {
- pr_err("ERR_MDMA: desc failed\n");
- pm_runtime_put(&mid->pdev->dev);
- return -ENOMEM;
- /*check*/
- }
- dma_async_tx_descriptor_init(&desc->txd, chan);
- desc->txd.tx_submit = intel_mid_dma_tx_submit;
- desc->txd.flags = DMA_CTRL_ACK;
- desc->txd.phys = phys;
- spin_lock_bh(&midc->lock);
- i = ++midc->descs_allocated;
- list_add_tail(&desc->desc_node, &midc->free_list);
- }
- spin_unlock_bh(&midc->lock);
- midc->in_use = true;
- midc->busy = false;
- pr_debug("MID_DMA: Desc alloc done ret: %d desc\n", i);
- return i;
-}
-
-/**
- * midc_handle_error - Handle DMA txn error
- * @mid: controller where error occurred
- * @midc: chan where error occurred
- *
- * Scan the descriptor for error
- */
-static void midc_handle_error(struct middma_device *mid,
- struct intel_mid_dma_chan *midc)
-{
- midc_scan_descriptors(mid, midc);
-}
-
-/**
- * dma_tasklet - DMA interrupt tasklet
- * @data: tasklet arg (the controller structure)
- *
- * Scan the controller for interrupts for completion/error
- * Clear the interrupt and call for handling completion/error
- */
-static void dma_tasklet(unsigned long data)
-{
- struct middma_device *mid = NULL;
- struct intel_mid_dma_chan *midc = NULL;
- u32 status, raw_tfr, raw_block;
- int i;
-
- mid = (struct middma_device *)data;
- if (mid == NULL) {
- pr_err("ERR_MDMA: tasklet Null param\n");
- return;
- }
- pr_debug("MDMA: in tasklet for device %x\n", mid->pci_id);
- raw_tfr = ioread32(mid->dma_base + RAW_TFR);
- raw_block = ioread32(mid->dma_base + RAW_BLOCK);
- status = raw_tfr | raw_block;
- status &= mid->intr_mask;
- while (status) {
- /*txn interrupt*/
- i = get_ch_index(&status, mid->chan_base);
- if (i < 0) {
- pr_err("ERR_MDMA:Invalid ch index %x\n", i);
- return;
- }
- midc = &mid->ch[i];
- if (midc == NULL) {
- pr_err("ERR_MDMA:Null param midc\n");
- return;
- }
- pr_debug("MDMA:Tx complete interrupt %x, Ch No %d Index %d\n",
- status, midc->ch_id, i);
- midc->raw_tfr = raw_tfr;
- midc->raw_block = raw_block;
- spin_lock_bh(&midc->lock);
- /*clearing this interrupts first*/
- iowrite32((1 << midc->ch_id), mid->dma_base + CLEAR_TFR);
- if (raw_block) {
- iowrite32((1 << midc->ch_id),
- mid->dma_base + CLEAR_BLOCK);
- }
- midc_scan_descriptors(mid, midc);
- pr_debug("MDMA:Scan of desc... complete, unmasking\n");
- iowrite32(UNMASK_INTR_REG(midc->ch_id),
- mid->dma_base + MASK_TFR);
- if (raw_block) {
- iowrite32(UNMASK_INTR_REG(midc->ch_id),
- mid->dma_base + MASK_BLOCK);
- }
- spin_unlock_bh(&midc->lock);
- }
-
- status = ioread32(mid->dma_base + RAW_ERR);
- status &= mid->intr_mask;
- while (status) {
- /*err interrupt*/
- i = get_ch_index(&status, mid->chan_base);
- if (i < 0) {
- pr_err("ERR_MDMA:Invalid ch index %x\n", i);
- return;
- }
- midc = &mid->ch[i];
- if (midc == NULL) {
- pr_err("ERR_MDMA:Null param midc\n");
- return;
- }
- pr_debug("MDMA:Tx complete interrupt %x, Ch No %d Index %d\n",
- status, midc->ch_id, i);
-
- iowrite32((1 << midc->ch_id), mid->dma_base + CLEAR_ERR);
- spin_lock_bh(&midc->lock);
- midc_handle_error(mid, midc);
- iowrite32(UNMASK_INTR_REG(midc->ch_id),
- mid->dma_base + MASK_ERR);
- spin_unlock_bh(&midc->lock);
- }
- pr_debug("MDMA:Exiting takslet...\n");
- return;
-}
-
-static void dma_tasklet1(unsigned long data)
-{
- pr_debug("MDMA:in takslet1...\n");
- return dma_tasklet(data);
-}
-
-static void dma_tasklet2(unsigned long data)
-{
- pr_debug("MDMA:in takslet2...\n");
- return dma_tasklet(data);
-}
-
-/**
- * intel_mid_dma_interrupt - DMA ISR
- * @irq: IRQ where interrupt occurred
- * @data: ISR cllback data (the controller structure)
- *
- * See if this is our interrupt if so then schedule the tasklet
- * otherwise ignore
- */
-static irqreturn_t intel_mid_dma_interrupt(int irq, void *data)
-{
- struct middma_device *mid = data;
- u32 tfr_status, err_status;
- int call_tasklet = 0;
-
- tfr_status = ioread32(mid->dma_base + RAW_TFR);
- err_status = ioread32(mid->dma_base + RAW_ERR);
- if (!tfr_status && !err_status)
- return IRQ_NONE;
-
- /*DMA Interrupt*/
- pr_debug("MDMA:Got an interrupt on irq %d\n", irq);
- pr_debug("MDMA: Status %x, Mask %x\n", tfr_status, mid->intr_mask);
- tfr_status &= mid->intr_mask;
- if (tfr_status) {
- /*need to disable intr*/
- iowrite32((tfr_status << INT_MASK_WE), mid->dma_base + MASK_TFR);
- iowrite32((tfr_status << INT_MASK_WE), mid->dma_base + MASK_BLOCK);
- pr_debug("MDMA: Calling tasklet %x\n", tfr_status);
- call_tasklet = 1;
- }
- err_status &= mid->intr_mask;
- if (err_status) {
- iowrite32((err_status << INT_MASK_WE),
- mid->dma_base + MASK_ERR);
- call_tasklet = 1;
- }
- if (call_tasklet)
- tasklet_schedule(&mid->tasklet);
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t intel_mid_dma_interrupt1(int irq, void *data)
-{
- return intel_mid_dma_interrupt(irq, data);
-}
-
-static irqreturn_t intel_mid_dma_interrupt2(int irq, void *data)
-{
- return intel_mid_dma_interrupt(irq, data);
-}
-
-/**
- * mid_setup_dma - Setup the DMA controller
- * @pdev: Controller PCI device structure
- *
- * Initialize the DMA controller, channels, registers with DMA engine,
- * ISR. Initialize DMA controller channels.
- */
-static int mid_setup_dma(struct pci_dev *pdev)
-{
- struct middma_device *dma = pci_get_drvdata(pdev);
- int err, i;
-
- /* DMA coherent memory pool for DMA descriptor allocations */
- dma->dma_pool = pci_pool_create("intel_mid_dma_desc_pool", pdev,
- sizeof(struct intel_mid_dma_desc),
- 32, 0);
- if (NULL == dma->dma_pool) {
- pr_err("ERR_MDMA:pci_pool_create failed\n");
- err = -ENOMEM;
- goto err_dma_pool;
- }
-
- INIT_LIST_HEAD(&dma->common.channels);
- dma->pci_id = pdev->device;
- if (dma->pimr_mask) {
- dma->mask_reg = ioremap(LNW_PERIPHRAL_MASK_BASE,
- LNW_PERIPHRAL_MASK_SIZE);
- if (dma->mask_reg == NULL) {
- pr_err("ERR_MDMA:Can't map periphral intr space !!\n");
- err = -ENOMEM;
- goto err_ioremap;
- }
- } else
- dma->mask_reg = NULL;
-
- pr_debug("MDMA:Adding %d channel for this controller\n", dma->max_chan);
- /*init CH structures*/
- dma->intr_mask = 0;
- dma->state = RUNNING;
- for (i = 0; i < dma->max_chan; i++) {
- struct intel_mid_dma_chan *midch = &dma->ch[i];
-
- midch->chan.device = &dma->common;
- dma_cookie_init(&midch->chan);
- midch->ch_id = dma->chan_base + i;
- pr_debug("MDMA:Init CH %d, ID %d\n", i, midch->ch_id);
-
- midch->dma_base = dma->dma_base;
- midch->ch_regs = dma->dma_base + DMA_CH_SIZE * midch->ch_id;
- midch->dma = dma;
- dma->intr_mask |= 1 << (dma->chan_base + i);
- spin_lock_init(&midch->lock);
-
- INIT_LIST_HEAD(&midch->active_list);
- INIT_LIST_HEAD(&midch->queue);
- INIT_LIST_HEAD(&midch->free_list);
- /*mask interrupts*/
- iowrite32(MASK_INTR_REG(midch->ch_id),
- dma->dma_base + MASK_BLOCK);
- iowrite32(MASK_INTR_REG(midch->ch_id),
- dma->dma_base + MASK_SRC_TRAN);
- iowrite32(MASK_INTR_REG(midch->ch_id),
- dma->dma_base + MASK_DST_TRAN);
- iowrite32(MASK_INTR_REG(midch->ch_id),
- dma->dma_base + MASK_ERR);
- iowrite32(MASK_INTR_REG(midch->ch_id),
- dma->dma_base + MASK_TFR);
-
- disable_dma_interrupt(midch);
- list_add_tail(&midch->chan.device_node, &dma->common.channels);
- }
- pr_debug("MDMA: Calc Mask as %x for this controller\n", dma->intr_mask);
-
- /*init dma structure*/
- dma_cap_zero(dma->common.cap_mask);
- dma_cap_set(DMA_MEMCPY, dma->common.cap_mask);
- dma_cap_set(DMA_SLAVE, dma->common.cap_mask);
- dma_cap_set(DMA_PRIVATE, dma->common.cap_mask);
- dma->common.dev = &pdev->dev;
-
- dma->common.device_alloc_chan_resources =
- intel_mid_dma_alloc_chan_resources;
- dma->common.device_free_chan_resources =
- intel_mid_dma_free_chan_resources;
-
- dma->common.device_tx_status = intel_mid_dma_tx_status;
- dma->common.device_prep_dma_memcpy = intel_mid_dma_prep_memcpy;
- dma->common.device_issue_pending = intel_mid_dma_issue_pending;
- dma->common.device_prep_slave_sg = intel_mid_dma_prep_slave_sg;
- dma->common.device_config = intel_mid_dma_config;
- dma->common.device_terminate_all = intel_mid_dma_terminate_all;
-
- /*enable dma cntrl*/
- iowrite32(REG_BIT0, dma->dma_base + DMA_CFG);
-
- /*register irq */
- if (dma->pimr_mask) {
- pr_debug("MDMA:Requesting irq shared for DMAC1\n");
- err = request_irq(pdev->irq, intel_mid_dma_interrupt1,
- IRQF_SHARED, "INTEL_MID_DMAC1", dma);
- if (0 != err)
- goto err_irq;
- } else {
- dma->intr_mask = 0x03;
- pr_debug("MDMA:Requesting irq for DMAC2\n");
- err = request_irq(pdev->irq, intel_mid_dma_interrupt2,
- IRQF_SHARED, "INTEL_MID_DMAC2", dma);
- if (0 != err)
- goto err_irq;
- }
- /*register device w/ engine*/
- err = dma_async_device_register(&dma->common);
- if (0 != err) {
- pr_err("ERR_MDMA:device_register failed: %d\n", err);
- goto err_engine;
- }
- if (dma->pimr_mask) {
- pr_debug("setting up tasklet1 for DMAC1\n");
- tasklet_init(&dma->tasklet, dma_tasklet1, (unsigned long)dma);
- } else {
- pr_debug("setting up tasklet2 for DMAC2\n");
- tasklet_init(&dma->tasklet, dma_tasklet2, (unsigned long)dma);
- }
- return 0;
-
-err_engine:
- free_irq(pdev->irq, dma);
-err_irq:
- if (dma->mask_reg)
- iounmap(dma->mask_reg);
-err_ioremap:
- pci_pool_destroy(dma->dma_pool);
-err_dma_pool:
- pr_err("ERR_MDMA:setup_dma failed: %d\n", err);
- return err;
-
-}
-
-/**
- * middma_shutdown - Shutdown the DMA controller
- * @pdev: Controller PCI device structure
- *
- * Called by remove
- * Unregister DMa controller, clear all structures and free interrupt
- */
-static void middma_shutdown(struct pci_dev *pdev)
-{
- struct middma_device *device = pci_get_drvdata(pdev);
-
- dma_async_device_unregister(&device->common);
- pci_pool_destroy(device->dma_pool);
- if (device->mask_reg)
- iounmap(device->mask_reg);
- if (device->dma_base)
- iounmap(device->dma_base);
- free_irq(pdev->irq, device);
- return;
-}
-
-/**
- * intel_mid_dma_probe - PCI Probe
- * @pdev: Controller PCI device structure
- * @id: pci device id structure
- *
- * Initialize the PCI device, map BARs, query driver data.
- * Call setup_dma to complete contoller and chan initilzation
- */
-static int intel_mid_dma_probe(struct pci_dev *pdev,
- const struct pci_device_id *id)
-{
- struct middma_device *device;
- u32 base_addr, bar_size;
- struct intel_mid_dma_probe_info *info;
- int err;
-
- pr_debug("MDMA: probe for %x\n", pdev->device);
- info = (void *)id->driver_data;
- pr_debug("MDMA: CH %d, base %d, block len %d, Periphral mask %x\n",
- info->max_chan, info->ch_base,
- info->block_size, info->pimr_mask);
-
- err = pci_enable_device(pdev);
- if (err)
- goto err_enable_device;
-
- err = pci_request_regions(pdev, "intel_mid_dmac");
- if (err)
- goto err_request_regions;
-
- err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
- if (err)
- goto err_set_dma_mask;
-
- err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
- if (err)
- goto err_set_dma_mask;
-
- device = kzalloc(sizeof(*device), GFP_KERNEL);
- if (!device) {
- pr_err("ERR_MDMA:kzalloc failed probe\n");
- err = -ENOMEM;
- goto err_kzalloc;
- }
- device->pdev = pci_dev_get(pdev);
-
- base_addr = pci_resource_start(pdev, 0);
- bar_size = pci_resource_len(pdev, 0);
- device->dma_base = ioremap_nocache(base_addr, DMA_REG_SIZE);
- if (!device->dma_base) {
- pr_err("ERR_MDMA:ioremap failed\n");
- err = -ENOMEM;
- goto err_ioremap;
- }
- pci_set_drvdata(pdev, device);
- pci_set_master(pdev);
- device->max_chan = info->max_chan;
- device->chan_base = info->ch_base;
- device->block_size = info->block_size;
- device->pimr_mask = info->pimr_mask;
-
- err = mid_setup_dma(pdev);
- if (err)
- goto err_dma;
-
- pm_runtime_put_noidle(&pdev->dev);
- pm_runtime_allow(&pdev->dev);
- return 0;
-
-err_dma:
- iounmap(device->dma_base);
-err_ioremap:
- pci_dev_put(pdev);
- kfree(device);
-err_kzalloc:
-err_set_dma_mask:
- pci_release_regions(pdev);
- pci_disable_device(pdev);
-err_request_regions:
-err_enable_device:
- pr_err("ERR_MDMA:Probe failed %d\n", err);
- return err;
-}
-
-/**
- * intel_mid_dma_remove - PCI remove
- * @pdev: Controller PCI device structure
- *
- * Free up all resources and data
- * Call shutdown_dma to complete contoller and chan cleanup
- */
-static void intel_mid_dma_remove(struct pci_dev *pdev)
-{
- struct middma_device *device = pci_get_drvdata(pdev);
-
- pm_runtime_get_noresume(&pdev->dev);
- pm_runtime_forbid(&pdev->dev);
- middma_shutdown(pdev);
- pci_dev_put(pdev);
- kfree(device);
- pci_release_regions(pdev);
- pci_disable_device(pdev);
-}
-
-/* Power Management */
-/*
-* dma_suspend - PCI suspend function
-*
-* @pci: PCI device structure
-* @state: PM message
-*
-* This function is called by OS when a power event occurs
-*/
-static int dma_suspend(struct device *dev)
-{
- struct pci_dev *pci = to_pci_dev(dev);
- int i;
- struct middma_device *device = pci_get_drvdata(pci);
- pr_debug("MDMA: dma_suspend called\n");
-
- for (i = 0; i < device->max_chan; i++) {
- if (device->ch[i].in_use)
- return -EAGAIN;
- }
- dmac1_mask_periphral_intr(device);
- device->state = SUSPENDED;
- pci_save_state(pci);
- pci_disable_device(pci);
- pci_set_power_state(pci, PCI_D3hot);
- return 0;
-}
-
-/**
-* dma_resume - PCI resume function
-*
-* @pci: PCI device structure
-*
-* This function is called by OS when a power event occurs
-*/
-int dma_resume(struct device *dev)
-{
- struct pci_dev *pci = to_pci_dev(dev);
- int ret;
- struct middma_device *device = pci_get_drvdata(pci);
-
- pr_debug("MDMA: dma_resume called\n");
- pci_set_power_state(pci, PCI_D0);
- pci_restore_state(pci);
- ret = pci_enable_device(pci);
- if (ret) {
- pr_err("MDMA: device can't be enabled for %x\n", pci->device);
- return ret;
- }
- device->state = RUNNING;
- iowrite32(REG_BIT0, device->dma_base + DMA_CFG);
- return 0;
-}
-
-static int dma_runtime_suspend(struct device *dev)
-{
- struct pci_dev *pci_dev = to_pci_dev(dev);
- struct middma_device *device = pci_get_drvdata(pci_dev);
-
- device->state = SUSPENDED;
- return 0;
-}
-
-static int dma_runtime_resume(struct device *dev)
-{
- struct pci_dev *pci_dev = to_pci_dev(dev);
- struct middma_device *device = pci_get_drvdata(pci_dev);
-
- device->state = RUNNING;
- iowrite32(REG_BIT0, device->dma_base + DMA_CFG);
- return 0;
-}
-
-static int dma_runtime_idle(struct device *dev)
-{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct middma_device *device = pci_get_drvdata(pdev);
- int i;
-
- for (i = 0; i < device->max_chan; i++) {
- if (device->ch[i].in_use)
- return -EAGAIN;
- }
-
- return 0;
-}
-
-/******************************************************************************
-* PCI stuff
-*/
-static struct pci_device_id intel_mid_dma_ids[] = {
- { PCI_VDEVICE(INTEL, INTEL_MID_DMAC1_ID), INFO(2, 6, 4095, 0x200020)},
- { PCI_VDEVICE(INTEL, INTEL_MID_DMAC2_ID), INFO(2, 0, 2047, 0)},
- { PCI_VDEVICE(INTEL, INTEL_MID_GP_DMAC2_ID), INFO(2, 0, 2047, 0)},
- { PCI_VDEVICE(INTEL, INTEL_MFLD_DMAC1_ID), INFO(4, 0, 4095, 0x400040)},
- { 0, }
-};
-MODULE_DEVICE_TABLE(pci, intel_mid_dma_ids);
-
-static const struct dev_pm_ops intel_mid_dma_pm = {
- .runtime_suspend = dma_runtime_suspend,
- .runtime_resume = dma_runtime_resume,
- .runtime_idle = dma_runtime_idle,
- .suspend = dma_suspend,
- .resume = dma_resume,
-};
-
-static struct pci_driver intel_mid_dma_pci_driver = {
- .name = "Intel MID DMA",
- .id_table = intel_mid_dma_ids,
- .probe = intel_mid_dma_probe,
- .remove = intel_mid_dma_remove,
-#ifdef CONFIG_PM
- .driver = {
- .pm = &intel_mid_dma_pm,
- },
-#endif
-};
-
-static int __init intel_mid_dma_init(void)
-{
- pr_debug("INFO_MDMA: LNW DMA Driver Version %s\n",
- INTEL_MID_DMA_DRIVER_VERSION);
- return pci_register_driver(&intel_mid_dma_pci_driver);
-}
-fs_initcall(intel_mid_dma_init);
-
-static void __exit intel_mid_dma_exit(void)
-{
- pci_unregister_driver(&intel_mid_dma_pci_driver);
-}
-module_exit(intel_mid_dma_exit);
-
-MODULE_AUTHOR("Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>");
-MODULE_DESCRIPTION("Intel (R) MID DMAC Driver");
-MODULE_LICENSE("GPL v2");
-MODULE_VERSION(INTEL_MID_DMA_DRIVER_VERSION);
diff --git a/drivers/dma/intel_mid_dma_regs.h b/drivers/dma/intel_mid_dma_regs.h
deleted file mode 100644
index 17b4219..0000000
--- a/drivers/dma/intel_mid_dma_regs.h
+++ /dev/null
@@ -1,299 +0,0 @@
-/*
- * intel_mid_dma_regs.h - Intel MID DMA Drivers
- *
- * Copyright (C) 2008-10 Intel Corp
- * Author: Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * 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; version 2 of the License.
- *
- * 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.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- *
- */
-#ifndef __INTEL_MID_DMAC_REGS_H__
-#define __INTEL_MID_DMAC_REGS_H__
-
-#include <linux/dmaengine.h>
-#include <linux/dmapool.h>
-#include <linux/pci_ids.h>
-
-#define INTEL_MID_DMA_DRIVER_VERSION "1.1.0"
-
-#define REG_BIT0 0x00000001
-#define REG_BIT8 0x00000100
-#define INT_MASK_WE 0x8
-#define CLEAR_DONE 0xFFFFEFFF
-#define UNMASK_INTR_REG(chan_num) \
- ((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
-#define MASK_INTR_REG(chan_num) (REG_BIT8 << chan_num)
-
-#define ENABLE_CHANNEL(chan_num) \
- ((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
-
-#define DISABLE_CHANNEL(chan_num) \
- (REG_BIT8 << chan_num)
-
-#define DESCS_PER_CHANNEL 16
-/*DMA Registers*/
-/*registers associated with channel programming*/
-#define DMA_REG_SIZE 0x400
-#define DMA_CH_SIZE 0x58
-
-/*CH X REG = (DMA_CH_SIZE)*CH_NO + REG*/
-#define SAR 0x00 /* Source Address Register*/
-#define DAR 0x08 /* Destination Address Register*/
-#define LLP 0x10 /* Linked List Pointer Register*/
-#define CTL_LOW 0x18 /* Control Register*/
-#define CTL_HIGH 0x1C /* Control Register*/
-#define CFG_LOW 0x40 /* Configuration Register Low*/
-#define CFG_HIGH 0x44 /* Configuration Register high*/
-
-#define STATUS_TFR 0x2E8
-#define STATUS_BLOCK 0x2F0
-#define STATUS_ERR 0x308
-
-#define RAW_TFR 0x2C0
-#define RAW_BLOCK 0x2C8
-#define RAW_ERR 0x2E0
-
-#define MASK_TFR 0x310
-#define MASK_BLOCK 0x318
-#define MASK_SRC_TRAN 0x320
-#define MASK_DST_TRAN 0x328
-#define MASK_ERR 0x330
-
-#define CLEAR_TFR 0x338
-#define CLEAR_BLOCK 0x340
-#define CLEAR_SRC_TRAN 0x348
-#define CLEAR_DST_TRAN 0x350
-#define CLEAR_ERR 0x358
-
-#define INTR_STATUS 0x360
-#define DMA_CFG 0x398
-#define DMA_CHAN_EN 0x3A0
-
-/*DMA channel control registers*/
-union intel_mid_dma_ctl_lo {
- struct {
- u32 int_en:1; /*enable or disable interrupts*/
- /*should be 0*/
- u32 dst_tr_width:3; /*destination transfer width*/
- /*usually 32 bits = 010*/
- u32 src_tr_width:3; /*source transfer width*/
- /*usually 32 bits = 010*/
- u32 dinc:2; /*destination address inc/dec*/
- /*For mem:INC=00, Periphral NoINC=11*/
- u32 sinc:2; /*source address inc or dec, as above*/
- u32 dst_msize:3; /*destination burst transaction length*/
- /*always = 16 ie 011*/
- u32 src_msize:3; /*source burst transaction length*/
- /*always = 16 ie 011*/
- u32 reser1:3;
- u32 tt_fc:3; /*transfer type and flow controller*/
- /*M-M = 000
- P-M = 010
- M-P = 001*/
- u32 dms:2; /*destination master select = 0*/
- u32 sms:2; /*source master select = 0*/
- u32 llp_dst_en:1; /*enable/disable destination LLP = 0*/
- u32 llp_src_en:1; /*enable/disable source LLP = 0*/
- u32 reser2:3;
- } ctlx;
- u32 ctl_lo;
-};
-
-union intel_mid_dma_ctl_hi {
- struct {
- u32 block_ts:12; /*block transfer size*/
- u32 done:1; /*Done - updated by DMAC*/
- u32 reser:19; /*configured by DMAC*/
- } ctlx;
- u32 ctl_hi;
-
-};
-
-/*DMA channel configuration registers*/
-union intel_mid_dma_cfg_lo {
- struct {
- u32 reser1:5;
- u32 ch_prior:3; /*channel priority = 0*/
- u32 ch_susp:1; /*channel suspend = 0*/
- u32 fifo_empty:1; /*FIFO empty or not R bit = 0*/
- u32 hs_sel_dst:1; /*select HW/SW destn handshaking*/
- /*HW = 0, SW = 1*/
- u32 hs_sel_src:1; /*select HW/SW src handshaking*/
- u32 reser2:6;
- u32 dst_hs_pol:1; /*dest HS interface polarity*/
- u32 src_hs_pol:1; /*src HS interface polarity*/
- u32 max_abrst:10; /*max AMBA burst len = 0 (no sw limit*/
- u32 reload_src:1; /*auto reload src addr =1 if src is P*/
- u32 reload_dst:1; /*AR destn addr =1 if dstn is P*/
- } cfgx;
- u32 cfg_lo;
-};
-
-union intel_mid_dma_cfg_hi {
- struct {
- u32 fcmode:1; /*flow control mode = 1*/
- u32 fifo_mode:1; /*FIFO mode select = 1*/
- u32 protctl:3; /*protection control = 0*/
- u32 rsvd:2;
- u32 src_per:4; /*src hw HS interface*/
- u32 dst_per:4; /*dstn hw HS interface*/
- u32 reser2:17;
- } cfgx;
- u32 cfg_hi;
-};
-
-
-/**
- * struct intel_mid_dma_chan - internal mid representation of a DMA channel
- * @chan: dma_chan strcture represetation for mid chan
- * @ch_regs: MMIO register space pointer to channel register
- * @dma_base: MMIO register space DMA engine base pointer
- * @ch_id: DMA channel id
- * @lock: channel spinlock
- * @active_list: current active descriptors
- * @queue: current queued up descriptors
- * @free_list: current free descriptors
- * @slave: dma slave structure
- * @descs_allocated: total number of descriptors allocated
- * @dma: dma device structure pointer
- * @busy: bool representing if ch is busy (active txn) or not
- * @in_use: bool representing if ch is in use or not
- * @raw_tfr: raw trf interrupt received
- * @raw_block: raw block interrupt received
- */
-struct intel_mid_dma_chan {
- struct dma_chan chan;
- void __iomem *ch_regs;
- void __iomem *dma_base;
- int ch_id;
- spinlock_t lock;
- struct list_head active_list;
- struct list_head queue;
- struct list_head free_list;
- unsigned int descs_allocated;
- struct middma_device *dma;
- bool busy;
- bool in_use;
- u32 raw_tfr;
- u32 raw_block;
- struct intel_mid_dma_slave *mid_slave;
-};
-
-static inline struct intel_mid_dma_chan *to_intel_mid_dma_chan(
- struct dma_chan *chan)
-{
- return container_of(chan, struct intel_mid_dma_chan, chan);
-}
-
-enum intel_mid_dma_state {
- RUNNING = 0,
- SUSPENDED,
-};
-/**
- * struct middma_device - internal representation of a DMA device
- * @pdev: PCI device
- * @dma_base: MMIO register space pointer of DMA
- * @dma_pool: for allocating DMA descriptors
- * @common: embedded struct dma_device
- * @tasklet: dma tasklet for processing interrupts
- * @ch: per channel data
- * @pci_id: DMA device PCI ID
- * @intr_mask: Interrupt mask to be used
- * @mask_reg: MMIO register for periphral mask
- * @chan_base: Base ch index (read from driver data)
- * @max_chan: max number of chs supported (from drv_data)
- * @block_size: Block size of DMA transfer supported (from drv_data)
- * @pimr_mask: MMIO register addr for periphral interrupt (from drv_data)
- * @state: dma PM device state
- */
-struct middma_device {
- struct pci_dev *pdev;
- void __iomem *dma_base;
- struct pci_pool *dma_pool;
- struct dma_device common;
- struct tasklet_struct tasklet;
- struct intel_mid_dma_chan ch[MAX_CHAN];
- unsigned int pci_id;
- unsigned int intr_mask;
- void __iomem *mask_reg;
- int chan_base;
- int max_chan;
- int block_size;
- unsigned int pimr_mask;
- enum intel_mid_dma_state state;
-};
-
-static inline struct middma_device *to_middma_device(struct dma_device *common)
-{
- return container_of(common, struct middma_device, common);
-}
-
-struct intel_mid_dma_desc {
- void __iomem *block; /*ch ptr*/
- struct list_head desc_node;
- struct dma_async_tx_descriptor txd;
- size_t len;
- dma_addr_t sar;
- dma_addr_t dar;
- u32 cfg_hi;
- u32 cfg_lo;
- u32 ctl_lo;
- u32 ctl_hi;
- struct pci_pool *lli_pool;
- struct intel_mid_dma_lli *lli;
- dma_addr_t lli_phys;
- unsigned int lli_length;
- unsigned int current_lli;
- dma_addr_t next;
- enum dma_transfer_direction dirn;
- enum dma_status status;
- enum dma_slave_buswidth width; /*width of DMA txn*/
- enum intel_mid_dma_mode cfg_mode; /*mode configuration*/
-
-};
-
-struct intel_mid_dma_lli {
- dma_addr_t sar;
- dma_addr_t dar;
- dma_addr_t llp;
- u32 ctl_lo;
- u32 ctl_hi;
-} __attribute__ ((packed));
-
-static inline int test_ch_en(void __iomem *dma, u32 ch_no)
-{
- u32 en_reg = ioread32(dma + DMA_CHAN_EN);
- return (en_reg >> ch_no) & 0x1;
-}
-
-static inline struct intel_mid_dma_desc *to_intel_mid_dma_desc
- (struct dma_async_tx_descriptor *txd)
-{
- return container_of(txd, struct intel_mid_dma_desc, txd);
-}
-
-static inline struct intel_mid_dma_slave *to_intel_mid_dma_slave
- (struct dma_slave_config *slave)
-{
- return container_of(slave, struct intel_mid_dma_slave, dma_slave);
-}
-
-
-int dma_resume(struct device *dev);
-
-#endif /*__INTEL_MID_DMAC_REGS_H__*/
diff --git a/include/linux/intel_mid_dma.h b/include/linux/intel_mid_dma.h
deleted file mode 100644
index 10496bd..0000000
--- a/include/linux/intel_mid_dma.h
+++ /dev/null
@@ -1,76 +0,0 @@
-/*
- * intel_mid_dma.h - Intel MID DMA Drivers
- *
- * Copyright (C) 2008-10 Intel Corp
- * Author: Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * 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; version 2 of the License.
- *
- * 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.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- *
- */
-#ifndef __INTEL_MID_DMA_H__
-#define __INTEL_MID_DMA_H__
-
-#include <linux/dmaengine.h>
-
-#define DMA_PREP_CIRCULAR_LIST (1 << 10)
-
-/*DMA mode configurations*/
-enum intel_mid_dma_mode {
- LNW_DMA_PER_TO_MEM = 0, /*periphral to memory configuration*/
- LNW_DMA_MEM_TO_PER, /*memory to periphral configuration*/
- LNW_DMA_MEM_TO_MEM, /*mem to mem confg (testing only)*/
-};
-
-/*DMA handshaking*/
-enum intel_mid_dma_hs_mode {
- LNW_DMA_HW_HS = 0, /*HW Handshaking only*/
- LNW_DMA_SW_HS = 1, /*SW Handshaking not recommended*/
-};
-
-/*Burst size configuration*/
-enum intel_mid_dma_msize {
- LNW_DMA_MSIZE_1 = 0x0,
- LNW_DMA_MSIZE_4 = 0x1,
- LNW_DMA_MSIZE_8 = 0x2,
- LNW_DMA_MSIZE_16 = 0x3,
- LNW_DMA_MSIZE_32 = 0x4,
- LNW_DMA_MSIZE_64 = 0x5,
-};
-
-/**
- * struct intel_mid_dma_slave - DMA slave structure
- *
- * @dirn: DMA trf direction
- * @src_width: tx register width
- * @dst_width: rx register width
- * @hs_mode: HW/SW handshaking mode
- * @cfg_mode: DMA data transfer mode (per-per/mem-per/mem-mem)
- * @src_msize: Source DMA burst size
- * @dst_msize: Dst DMA burst size
- * @per_addr: Periphral address
- * @device_instance: DMA peripheral device instance, we can have multiple
- * peripheral device connected to single DMAC
- */
-struct intel_mid_dma_slave {
- enum intel_mid_dma_hs_mode hs_mode; /*handshaking*/
- enum intel_mid_dma_mode cfg_mode; /*mode configuration*/
- unsigned int device_instance; /*0, 1 for periphral instance*/
- struct dma_slave_config dma_slave;
-};
-
-#endif /*__INTEL_MID_DMA_H__*/
--
2.1.4
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