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davinci: add EDMA driver

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Original code for 2.6.10 and 2.6.28 series done by Texas Instruments
and MontaVista, but major updates and rework done by Troy Kisky and
David Brownell.

Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Kevin Hilman 2009-04-14 07:18:14 -05:00
parent e60990023c
commit a4768d2275
3 changed files with 1364 additions and 1 deletions
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2
arch/arm/mach-davinci/Makefile
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@ -5,7 +5,7 @@
# Common objects
obj-y := time.o irq.o clock.o serial.o io.o id.o psc.o \
gpio.o mux.o devices.o usb.o
gpio.o mux.o devices.o dma.o usb.o
# Board specific
obj-$(CONFIG_MACH_DAVINCI_EVM) += board-evm.o

1135
arch/arm/mach-davinci/dma.c Normal file
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228
arch/arm/mach-davinci/include/mach/edma.h Normal file
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@ -0,0 +1,228 @@
/*
* TI DAVINCI dma definitions
*
* Copyright (C) 2006-2009 Texas Instruments.
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* This EDMA3 programming framework exposes two basic kinds of resource:
*
* Channel Triggers transfers, usually from a hardware event but
* also manually or by "chaining" from DMA completions.
* Each channel is coupled to a Parameter RAM (PaRAM) slot.
*
* Slot Each PaRAM slot holds a DMA transfer descriptor (PaRAM
* "set"), source and destination addresses, a link to a
* next PaRAM slot (if any), options for the transfer, and
* instructions for updating those addresses. There are
* more than twice as many slots as event channels.
*
* Each PaRAM set describes a sequence of transfers, either for one large
* buffer or for several discontiguous smaller buffers. An EDMA transfer
* is driven only from a channel, which performs the transfers specified
* in its PaRAM slot until there are no more transfers. When that last
* transfer completes, the "link" field may be used to reload the channel's
* PaRAM slot with a new transfer descriptor.
*
* The EDMA Channel Controller (CC) maps requests from channels into physical
* Transfer Controller (TC) requests when the channel triggers (by hardware
* or software events, or by chaining). The two physical DMA channels provided
* by the TCs are thus shared by many logical channels.
*
* DaVinci hardware also has a "QDMA" mechanism which is not currently
* supported through this interface. (DSP firmware uses it though.)
*/
#ifndef EDMA_H_
#define EDMA_H_
/* PaRAM slots are laid out like this */
struct edmacc_param {
unsigned int opt;
unsigned int src;
unsigned int a_b_cnt;
unsigned int dst;
unsigned int src_dst_bidx;
unsigned int link_bcntrld;
unsigned int src_dst_cidx;
unsigned int ccnt;
};
#define CCINT0_INTERRUPT 16
#define CCERRINT_INTERRUPT 17
#define TCERRINT0_INTERRUPT 18
#define TCERRINT1_INTERRUPT 19
/* fields in edmacc_param.opt */
#define SAM BIT(0)
#define DAM BIT(1)
#define SYNCDIM BIT(2)
#define STATIC BIT(3)
#define EDMA_FWID (0x07 << 8)
#define TCCMODE BIT(11)
#define EDMA_TCC(t) ((t) << 12)
#define TCINTEN BIT(20)
#define ITCINTEN BIT(21)
#define TCCHEN BIT(22)
#define ITCCHEN BIT(23)
#define TRWORD (0x7<<2)
#define PAENTRY (0x1ff<<5)
/* Drivers should avoid using these symbolic names for dm644x
* channels, and use platform_device IORESOURCE_DMA resources
* instead. (Other DaVinci chips have different peripherals
* and thus have different DMA channel mappings.)
*/
#define DAVINCI_DMA_MCBSP_TX 2
#define DAVINCI_DMA_MCBSP_RX 3
#define DAVINCI_DMA_VPSS_HIST 4
#define DAVINCI_DMA_VPSS_H3A 5
#define DAVINCI_DMA_VPSS_PRVU 6
#define DAVINCI_DMA_VPSS_RSZ 7
#define DAVINCI_DMA_IMCOP_IMXINT 8
#define DAVINCI_DMA_IMCOP_VLCDINT 9
#define DAVINCI_DMA_IMCO_PASQINT 10
#define DAVINCI_DMA_IMCOP_DSQINT 11
#define DAVINCI_DMA_SPI_SPIX 16
#define DAVINCI_DMA_SPI_SPIR 17
#define DAVINCI_DMA_UART0_URXEVT0 18
#define DAVINCI_DMA_UART0_UTXEVT0 19
#define DAVINCI_DMA_UART1_URXEVT1 20
#define DAVINCI_DMA_UART1_UTXEVT1 21
#define DAVINCI_DMA_UART2_URXEVT2 22
#define DAVINCI_DMA_UART2_UTXEVT2 23
#define DAVINCI_DMA_MEMSTK_MSEVT 24
#define DAVINCI_DMA_MMCRXEVT 26
#define DAVINCI_DMA_MMCTXEVT 27
#define DAVINCI_DMA_I2C_ICREVT 28
#define DAVINCI_DMA_I2C_ICXEVT 29
#define DAVINCI_DMA_GPIO_GPINT0 32
#define DAVINCI_DMA_GPIO_GPINT1 33
#define DAVINCI_DMA_GPIO_GPINT2 34
#define DAVINCI_DMA_GPIO_GPINT3 35
#define DAVINCI_DMA_GPIO_GPINT4 36
#define DAVINCI_DMA_GPIO_GPINT5 37
#define DAVINCI_DMA_GPIO_GPINT6 38
#define DAVINCI_DMA_GPIO_GPINT7 39
#define DAVINCI_DMA_GPIO_GPBNKINT0 40
#define DAVINCI_DMA_GPIO_GPBNKINT1 41
#define DAVINCI_DMA_GPIO_GPBNKINT2 42
#define DAVINCI_DMA_GPIO_GPBNKINT3 43
#define DAVINCI_DMA_GPIO_GPBNKINT4 44
#define DAVINCI_DMA_TIMER0_TINT0 48
#define DAVINCI_DMA_TIMER1_TINT1 49
#define DAVINCI_DMA_TIMER2_TINT2 50
#define DAVINCI_DMA_TIMER3_TINT3 51
#define DAVINCI_DMA_PWM0 52
#define DAVINCI_DMA_PWM1 53
#define DAVINCI_DMA_PWM2 54
/*ch_status paramater of callback function possible values*/
#define DMA_COMPLETE 1
#define DMA_CC_ERROR 2
#define DMA_TC1_ERROR 3
#define DMA_TC2_ERROR 4
enum address_mode {
INCR = 0,
FIFO = 1
};
enum fifo_width {
W8BIT = 0,
W16BIT = 1,
W32BIT = 2,
W64BIT = 3,
W128BIT = 4,
W256BIT = 5
};
enum dma_event_q {
EVENTQ_0 = 0,
EVENTQ_1 = 1,
EVENTQ_DEFAULT = -1
};
enum sync_dimension {
ASYNC = 0,
ABSYNC = 1
};
#define EDMA_CHANNEL_ANY -1 /* for edma_alloc_channel() */
#define EDMA_SLOT_ANY -1 /* for edma_alloc_slot() */
/* alloc/free DMA channels and their dedicated parameter RAM slots */
int edma_alloc_channel(int channel,
void (*callback)(unsigned channel, u16 ch_status, void *data),
void *data, enum dma_event_q);
void edma_free_channel(unsigned channel);
/* alloc/free parameter RAM slots */
int edma_alloc_slot(int slot);
void edma_free_slot(unsigned slot);
/* calls that operate on part of a parameter RAM slot */
void edma_set_src(unsigned slot, dma_addr_t src_port,
enum address_mode mode, enum fifo_width);
void edma_set_dest(unsigned slot, dma_addr_t dest_port,
enum address_mode mode, enum fifo_width);
void edma_get_position(unsigned slot, dma_addr_t *src, dma_addr_t *dst);
void edma_set_src_index(unsigned slot, s16 src_bidx, s16 src_cidx);
void edma_set_dest_index(unsigned slot, s16 dest_bidx, s16 dest_cidx);
void edma_set_transfer_params(unsigned slot, u16 acnt, u16 bcnt, u16 ccnt,
u16 bcnt_rld, enum sync_dimension sync_mode);
void edma_link(unsigned from, unsigned to);
void edma_unlink(unsigned from);
/* calls that operate on an entire parameter RAM slot */
void edma_write_slot(unsigned slot, const struct edmacc_param *params);
void edma_read_slot(unsigned slot, struct edmacc_param *params);
/* channel control operations */
int edma_start(unsigned channel);
void edma_stop(unsigned channel);
void edma_clean_channel(unsigned channel);
void edma_clear_event(unsigned channel);
void edma_pause(unsigned channel);
void edma_resume(unsigned channel);
/* UNRELATED TO DMA */
int davinci_alloc_iram(unsigned size);
void davinci_free_iram(unsigned addr, unsigned size);
/* platform_data for EDMA driver */
struct edma_soc_info {
/* how many dma resources of each type */
unsigned n_channel;
unsigned n_region;
unsigned n_slot;
unsigned n_tc;
/* list of channels with no even trigger; terminated by "-1" */
const s8 *noevent;
};
#endif