d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
a18a7a414a
freebsd-dev/sys/arm/ti/ti_sdma.c
Oleksandr Tymoshenko e53470fee3 Merging of projects/armv6, part 10 
- Support for Texas Instruments SoCs:
	- AM335x
	- OMAP4

- Kernel configs, DTS for Beaglebone and Pandaboard

Submitted by:	Ben Gray, Damjan Marion
2012-08-15 06:31:32 +00:00

1247 lines
31 KiB
C
Raw Blame History

/*-
* Copyright (c) 2011
* Ben Gray <ben.r.gray@gmail.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/interrupt.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <sys/queue.h>
#include <sys/taskqueue.h>
#include <sys/timetc.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/ti/ti_cpuid.h>
#include <arm/ti/ti_prcm.h>
#include <arm/ti/ti_sdma.h>
#include <arm/ti/ti_sdmareg.h>
/**
* Kernel functions for using the DMA controller
*
*
* DMA TRANSFERS:
* A DMA transfer block consists of a number of frames (FN). Each frame
* consists of a number of elements, and each element can have a size of 8, 16,
* or 32 bits.
*
* OMAP44xx and newer chips support linked list (aka scatter gather) transfers,
* where a linked list of source/destination pairs can be placed in memory
* for the H/W to process. Earlier chips only allowed you to chain multiple
* channels together. However currently this linked list feature is not
* supported by the driver.
*
*/
/**
* Data structure per DMA channel.
*
*
*/
struct ti_sdma_channel {
/*
* The configuration registers for the given channel, these are modified
* by the set functions and only written to the actual registers when a
* transaction is started.
*/
uint32_t reg_csdp;
uint32_t reg_ccr;
uint32_t reg_cicr;
/* Set when one of the configuration registers above change */
uint32_t need_reg_write;
/* Callback function used when an interrupt is tripped on the given channel */
void (*callback)(unsigned int ch, uint32_t ch_status, void *data);
/* Callback data passed in the callback ... duh */
void* callback_data;
};
/**
* DMA driver context, allocated and stored globally, this driver is not
* intetned to ever be unloaded (see ti_sdma_sc).
*
*/
struct ti_sdma_softc {
device_t sc_dev;
struct resource* sc_irq_res;
struct resource* sc_mem_res;
/*
* I guess in theory we should have a mutex per DMA channel for register
* modifications. But since we know we are never going to be run on a SMP
* system, we can use just the single lock for all channels.
*/
struct mtx sc_mtx;
/* Stores the H/W revision read from the registers */
uint32_t sc_hw_rev;
/*
* Bits in the sc_active_channels data field indicate if the channel has
* been activated.
*/
uint32_t sc_active_channels;
struct ti_sdma_channel sc_channel[NUM_DMA_CHANNELS];
};
static struct ti_sdma_softc *ti_sdma_sc = NULL;
/**
* Macros for driver mutex locking
*/
#define TI_SDMA_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
#define TI_SDMA_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
#define TI_SDMA_LOCK_INIT(_sc) \
mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
"ti_sdma", MTX_SPIN)
#define TI_SDMA_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
#define TI_SDMA_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
#define TI_SDMA_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
/**
* Function prototypes
*
*/
static void ti_sdma_intr(void *);
/**
* ti_sdma_read_4 - reads a 32-bit value from one of the DMA registers
* @sc: DMA device context
* @off: The offset of a register from the DMA register address range
*
*
* RETURNS:
* 32-bit value read from the register.
*/
static inline uint32_t
ti_sdma_read_4(struct ti_sdma_softc *sc, bus_size_t off)
{
return bus_read_4(sc->sc_mem_res, off);
}
/**
* ti_sdma_write_4 - writes a 32-bit value to one of the DMA registers
* @sc: DMA device context
* @off: The offset of a register from the DMA register address range
*
*
* RETURNS:
* 32-bit value read from the register.
*/
static inline void
ti_sdma_write_4(struct ti_sdma_softc *sc, bus_size_t off, uint32_t val)
{
bus_write_4(sc->sc_mem_res, off, val);
}
/**
* ti_sdma_is_omap3_rev - returns true if H/W is from OMAP3 series
* @sc: DMA device context
*
*/
static inline int
ti_sdma_is_omap3_rev(struct ti_sdma_softc *sc)
{
return (sc->sc_hw_rev == DMA4_OMAP3_REV);
}
/**
* ti_sdma_is_omap4_rev - returns true if H/W is from OMAP4 series
* @sc: DMA device context
*
*/
static inline int
ti_sdma_is_omap4_rev(struct ti_sdma_softc *sc)
{
return (sc->sc_hw_rev == DMA4_OMAP4_REV);
}
/**
* ti_sdma_intr - interrupt handler for all 4 DMA IRQs
* @arg: ignored
*
* Called when any of the four DMA IRQs are triggered.
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* nothing
*/
static void
ti_sdma_intr(void *arg)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
uint32_t intr;
uint32_t csr;
unsigned int ch, j;
struct ti_sdma_channel* channel;
TI_SDMA_LOCK(sc);
for (j = 0; j < NUM_DMA_IRQS; j++) {
/* Get the flag interrupts (enabled) */
intr = ti_sdma_read_4(sc, DMA4_IRQSTATUS_L(j));
intr &= ti_sdma_read_4(sc, DMA4_IRQENABLE_L(j));
if (intr == 0x00000000)
continue;
/* Loop through checking the status bits */
for (ch = 0; ch < NUM_DMA_CHANNELS; ch++) {
if (intr & (1 << ch)) {
channel = &sc->sc_channel[ch];
/* Read the CSR regsiter and verify we don't have a spurious IRQ */
csr = ti_sdma_read_4(sc, DMA4_CSR(ch));
if (csr == 0) {
device_printf(sc->sc_dev, "Spurious DMA IRQ for channel "
"%d\n", ch);
continue;
}
/* Sanity check this channel is active */
if ((sc->sc_active_channels & (1 << ch)) == 0) {
device_printf(sc->sc_dev, "IRQ %d for a non-activated "
"channel %d\n", j, ch);
continue;
}
/* Check the status error codes */
if (csr & DMA4_CSR_DROP)
device_printf(sc->sc_dev, "Synchronization event drop "
"occurred during the transfer on channel %u\n",
ch);
if (csr & DMA4_CSR_SECURE_ERR)
device_printf(sc->sc_dev, "Secure transaction error event "
"on channel %u\n", ch);
if (csr & DMA4_CSR_MISALIGNED_ADRS_ERR)
device_printf(sc->sc_dev, "Misaligned address error event "
"on channel %u\n", ch);
if (csr & DMA4_CSR_TRANS_ERR) {
device_printf(sc->sc_dev, "Transaction error event on "
"channel %u\n", ch);
/*
* Apparently according to linux code, there is an errata
* that says the channel is not disabled upon this error.
* They explicitly disable the channel here .. since I
* haven't seen the errata, I'm going to ignore for now.
*/
}
/* Clear the status flags for the IRQ */
ti_sdma_write_4(sc, DMA4_CSR(ch), DMA4_CSR_CLEAR_MASK);
ti_sdma_write_4(sc, DMA4_IRQSTATUS_L(j), (1 << ch));
/* Call the callback for the given channel */
if (channel->callback)
channel->callback(ch, csr, channel->callback_data);
}
}
}
TI_SDMA_UNLOCK(sc);
return;
}
/**
* ti_sdma_activate_channel - activates a DMA channel
* @ch: upon return contains the channel allocated
* @callback: a callback function to associate with the channel
* @data: optional data supplied when the callback is called
*
* Simply activates a channel be enabling and writing default values to the
* channel's register set. It doesn't start a transaction, just populates the
* internal data structures and sets defaults.
*
* Note this function doesn't enable interrupts, for that you need to call
* ti_sdma_enable_channel_irq(). If not using IRQ to detect the end of the
* transfer, you can use ti_sdma_status_poll() to detect a change in the
* status.
*
* A channel must be activated before any of the other DMA functions can be
* called on it.
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* 0 on success, otherwise an error code
*/
int
ti_sdma_activate_channel(unsigned int *ch,
void (*callback)(unsigned int ch, uint32_t status, void *data),
void *data)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
struct ti_sdma_channel *channel = NULL;
uint32_t addr;
unsigned int i;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
if (ch == NULL)
return (EINVAL);
TI_SDMA_LOCK(sc);
/* Check to see if all channels are in use */
if (sc->sc_active_channels == 0xffffffff) {
TI_SDMA_UNLOCK(sc);
return (ENOMEM);
}
/* Find the first non-active channel */
for (i = 0; i < NUM_DMA_CHANNELS; i++) {
if (!(sc->sc_active_channels & (0x1 << i))) {
sc->sc_active_channels |= (0x1 << i);
*ch = i;
break;
}
}
/* Get the channel struct and populate the fields */
channel = &sc->sc_channel[*ch];
channel->callback = callback;
channel->callback_data = data;
channel->need_reg_write = 1;
/* Set the default configuration for the DMA channel */
channel->reg_csdp = DMA4_CSDP_DATA_TYPE(0x2)
| DMA4_CSDP_SRC_BURST_MODE(0)
| DMA4_CSDP_DST_BURST_MODE(0)
| DMA4_CSDP_SRC_ENDIANISM(0)
| DMA4_CSDP_DST_ENDIANISM(0)
| DMA4_CSDP_WRITE_MODE(0)
| DMA4_CSDP_SRC_PACKED(0)
| DMA4_CSDP_DST_PACKED(0);
channel->reg_ccr = DMA4_CCR_DST_ADDRESS_MODE(1)
| DMA4_CCR_SRC_ADDRESS_MODE(1)
| DMA4_CCR_READ_PRIORITY(0)
| DMA4_CCR_WRITE_PRIORITY(0)
| DMA4_CCR_SYNC_TRIGGER(0)
| DMA4_CCR_FRAME_SYNC(0)
| DMA4_CCR_BLOCK_SYNC(0);
channel->reg_cicr = DMA4_CICR_TRANS_ERR_IE
| DMA4_CICR_SECURE_ERR_IE
| DMA4_CICR_SUPERVISOR_ERR_IE
| DMA4_CICR_MISALIGNED_ADRS_ERR_IE;
/* Clear all the channel registers, this should abort any transaction */
for (addr = DMA4_CCR(*ch); addr <= DMA4_COLOR(*ch); addr += 4)
ti_sdma_write_4(sc, addr, 0x00000000);
TI_SDMA_UNLOCK(sc);
return 0;
}
/**
* ti_sdma_deactivate_channel - deactivates a channel
* @ch: the channel to deactivate
*
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_deactivate_channel(unsigned int ch)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
unsigned int j;
unsigned int addr;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
/* First check if the channel is currently active */
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EBUSY);
}
/* Mark the channel as inactive */
sc->sc_active_channels &= ~(1 << ch);
/* Disable all DMA interrupts for the channel. */
ti_sdma_write_4(sc, DMA4_CICR(ch), 0);
/* Make sure the DMA transfer is stopped. */
ti_sdma_write_4(sc, DMA4_CCR(ch), 0);
/* Clear the CSR register and IRQ status register */
ti_sdma_write_4(sc, DMA4_CSR(ch), DMA4_CSR_CLEAR_MASK);
for (j = 0; j < NUM_DMA_IRQS; j++) {
ti_sdma_write_4(sc, DMA4_IRQSTATUS_L(j), (1 << ch));
}
/* Clear all the channel registers, this should abort any transaction */
for (addr = DMA4_CCR(ch); addr <= DMA4_COLOR(ch); addr += 4)
ti_sdma_write_4(sc, addr, 0x00000000);
TI_SDMA_UNLOCK(sc);
return 0;
}
/**
* ti_sdma_disable_channel_irq - disables IRQ's on the given channel
* @ch: the channel to disable IRQ's on
*
* Disable interupt generation for the given channel.
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_disable_channel_irq(unsigned int ch)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
uint32_t irq_enable;
unsigned int j;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
/* Disable all the individual error conditions */
sc->sc_channel[ch].reg_cicr = 0x0000;
ti_sdma_write_4(sc, DMA4_CICR(ch), 0x0000);
/* Disable the channel interrupt enable */
for (j = 0; j < NUM_DMA_IRQS; j++) {
irq_enable = ti_sdma_read_4(sc, DMA4_IRQENABLE_L(j));
irq_enable &= ~(1 << ch);
ti_sdma_write_4(sc, DMA4_IRQENABLE_L(j), irq_enable);
}
/* Indicate the registers need to be rewritten on the next transaction */
sc->sc_channel[ch].need_reg_write = 1;
TI_SDMA_UNLOCK(sc);
return (0);
}
/**
* ti_sdma_disable_channel_irq - enables IRQ's on the given channel
* @ch: the channel to enable IRQ's on
* @flags: bitmask of interrupt types to enable
*
* Flags can be a bitmask of the following options:
* DMA_IRQ_FLAG_DROP
* DMA_IRQ_FLAG_HALF_FRAME_COMPL
* DMA_IRQ_FLAG_FRAME_COMPL
* DMA_IRQ_FLAG_START_LAST_FRAME
* DMA_IRQ_FLAG_BLOCK_COMPL
* DMA_IRQ_FLAG_ENDOF_PKT
* DMA_IRQ_FLAG_DRAIN
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_enable_channel_irq(unsigned int ch, uint32_t flags)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
uint32_t irq_enable;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
/* Always enable the error interrupts if we have interrupts enabled */
flags |= DMA4_CICR_TRANS_ERR_IE | DMA4_CICR_SECURE_ERR_IE |
DMA4_CICR_SUPERVISOR_ERR_IE | DMA4_CICR_MISALIGNED_ADRS_ERR_IE;
sc->sc_channel[ch].reg_cicr = flags;
/* Write the values to the register */
ti_sdma_write_4(sc, DMA4_CICR(ch), flags);
/* Enable the channel interrupt enable */
irq_enable = ti_sdma_read_4(sc, DMA4_IRQENABLE_L(0));
irq_enable |= (1 << ch);
ti_sdma_write_4(sc, DMA4_IRQENABLE_L(0), irq_enable);
/* Indicate the registers need to be rewritten on the next transaction */
sc->sc_channel[ch].need_reg_write = 1;
TI_SDMA_UNLOCK(sc);
return (0);
}
/**
* ti_sdma_get_channel_status - returns the status of a given channel
* @ch: the channel number to get the status of
* @status: upon return will contain the status bitmask, see below for possible
* values.
*
* DMA_STATUS_DROP
* DMA_STATUS_HALF
* DMA_STATUS_FRAME
* DMA_STATUS_LAST
* DMA_STATUS_BLOCK
* DMA_STATUS_SYNC
* DMA_STATUS_PKT
* DMA_STATUS_TRANS_ERR
* DMA_STATUS_SECURE_ERR
* DMA_STATUS_SUPERVISOR_ERR
* DMA_STATUS_MISALIGNED_ADRS_ERR
* DMA_STATUS_DRAIN_END
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_get_channel_status(unsigned int ch, uint32_t *status)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
uint32_t csr;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
TI_SDMA_UNLOCK(sc);
csr = ti_sdma_read_4(sc, DMA4_CSR(ch));
if (status != NULL)
*status = csr;
return (0);
}
/**
* ti_sdma_start_xfer - starts a DMA transfer
* @ch: the channel number to set the endianess of
* @src_paddr: the source phsyical address
* @dst_paddr: the destination phsyical address
* @frmcnt: the number of frames per block
* @elmcnt: the number of elements in a frame, an element is either an 8, 16
* or 32-bit value as defined by ti_sdma_set_xfer_burst()
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_start_xfer(unsigned int ch, unsigned int src_paddr,
unsigned long dst_paddr,
unsigned int frmcnt, unsigned int elmcnt)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
struct ti_sdma_channel *channel;
uint32_t ccr;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
channel = &sc->sc_channel[ch];
/* a) Write the CSDP register */
ti_sdma_write_4(sc, DMA4_CSDP(ch),
channel->reg_csdp | DMA4_CSDP_WRITE_MODE(1));
/* b) Set the number of element per frame CEN[23:0] */
ti_sdma_write_4(sc, DMA4_CEN(ch), elmcnt);
/* c) Set the number of frame per block CFN[15:0] */
ti_sdma_write_4(sc, DMA4_CFN(ch), frmcnt);
/* d) Set the Source/dest start address index CSSA[31:0]/CDSA[31:0] */
ti_sdma_write_4(sc, DMA4_CSSA(ch), src_paddr);
ti_sdma_write_4(sc, DMA4_CDSA(ch), dst_paddr);
/* e) Write the CCR register */
ti_sdma_write_4(sc, DMA4_CCR(ch), channel->reg_ccr);
/* f) - Set the source element index increment CSEI[15:0] */
ti_sdma_write_4(sc, DMA4_CSE(ch), 0x0001);
/* - Set the source frame index increment CSFI[15:0] */
ti_sdma_write_4(sc, DMA4_CSF(ch), 0x0001);
/* - Set the destination element index increment CDEI[15:0]*/
ti_sdma_write_4(sc, DMA4_CDE(ch), 0x0001);
/* - Set the destination frame index increment CDFI[31:0] */
ti_sdma_write_4(sc, DMA4_CDF(ch), 0x0001);
/* Clear the status register */
ti_sdma_write_4(sc, DMA4_CSR(ch), 0x1FFE);
/* Write the start-bit and away we go */
ccr = ti_sdma_read_4(sc, DMA4_CCR(ch));
ccr |= (1 << 7);
ti_sdma_write_4(sc, DMA4_CCR(ch), ccr);
/* Clear the reg write flag */
channel->need_reg_write = 0;
TI_SDMA_UNLOCK(sc);
return (0);
}
/**
* ti_sdma_start_xfer_packet - starts a packet DMA transfer
* @ch: the channel number to use for the transfer
* @src_paddr: the source physical address
* @dst_paddr: the destination physical address
* @frmcnt: the number of frames to transfer
* @elmcnt: the number of elements in a frame, an element is either an 8, 16
* or 32-bit value as defined by ti_sdma_set_xfer_burst()
* @pktsize: the number of elements in each transfer packet
*
* The @frmcnt and @elmcnt define the overall number of bytes to transfer,
* typically @frmcnt is 1 and @elmcnt contains the total number of elements.
* @pktsize is the size of each individual packet, there might be multiple
* packets per transfer. i.e. for the following with element size of 32-bits
*
* frmcnt = 1, elmcnt = 512, pktsize = 128
*
* Total transfer bytes = 1 * 512 = 512 elements or 2048 bytes
* Packets transfered = 128 / 512 = 4
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_start_xfer_packet(unsigned int ch, unsigned int src_paddr,
unsigned long dst_paddr, unsigned int frmcnt,
unsigned int elmcnt, unsigned int pktsize)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
struct ti_sdma_channel *channel;
uint32_t ccr;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
channel = &sc->sc_channel[ch];
/* a) Write the CSDP register */
if (channel->need_reg_write)
ti_sdma_write_4(sc, DMA4_CSDP(ch),
channel->reg_csdp | DMA4_CSDP_WRITE_MODE(1));
/* b) Set the number of elements to transfer CEN[23:0] */
ti_sdma_write_4(sc, DMA4_CEN(ch), elmcnt);
/* c) Set the number of frames to transfer CFN[15:0] */
ti_sdma_write_4(sc, DMA4_CFN(ch), frmcnt);
/* d) Set the Source/dest start address index CSSA[31:0]/CDSA[31:0] */
ti_sdma_write_4(sc, DMA4_CSSA(ch), src_paddr);
ti_sdma_write_4(sc, DMA4_CDSA(ch), dst_paddr);
/* e) Write the CCR register */
ti_sdma_write_4(sc, DMA4_CCR(ch),
channel->reg_ccr | DMA4_CCR_PACKET_TRANS);
/* f) - Set the source element index increment CSEI[15:0] */
ti_sdma_write_4(sc, DMA4_CSE(ch), 0x0001);
/* - Set the packet size, this is dependent on the sync source */
if (channel->reg_ccr & DMA4_CCR_SEL_SRC_DST_SYNC(1))
ti_sdma_write_4(sc, DMA4_CSF(ch), pktsize);
else
ti_sdma_write_4(sc, DMA4_CDF(ch), pktsize);
/* - Set the destination frame index increment CDFI[31:0] */
ti_sdma_write_4(sc, DMA4_CDE(ch), 0x0001);
/* Clear the status register */
ti_sdma_write_4(sc, DMA4_CSR(ch), 0x1FFE);
/* Write the start-bit and away we go */
ccr = ti_sdma_read_4(sc, DMA4_CCR(ch));
ccr |= (1 << 7);
ti_sdma_write_4(sc, DMA4_CCR(ch), ccr);
/* Clear the reg write flag */
channel->need_reg_write = 0;
TI_SDMA_UNLOCK(sc);
return (0);
}
/**
* ti_sdma_stop_xfer - stops any currently active transfers
* @ch: the channel number to set the endianess of
*
* This function call is effectively a NOP if no transaction is in progress.
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_stop_xfer(unsigned int ch)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
unsigned int j;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
/* Disable all DMA interrupts for the channel. */
ti_sdma_write_4(sc, DMA4_CICR(ch), 0);
/* Make sure the DMA transfer is stopped. */
ti_sdma_write_4(sc, DMA4_CCR(ch), 0);
/* Clear the CSR register and IRQ status register */
ti_sdma_write_4(sc, DMA4_CSR(ch), DMA4_CSR_CLEAR_MASK);
for (j = 0; j < NUM_DMA_IRQS; j++) {
ti_sdma_write_4(sc, DMA4_IRQSTATUS_L(j), (1 << ch));
}
/* Configuration registers need to be re-written on the next xfer */
sc->sc_channel[ch].need_reg_write = 1;
TI_SDMA_UNLOCK(sc);
return (0);
}
/**
* ti_sdma_set_xfer_endianess - sets the endianess of subsequent transfers
* @ch: the channel number to set the endianess of
* @src: the source endianess (either DMA_ENDIAN_LITTLE or DMA_ENDIAN_BIG)
* @dst: the destination endianess (either DMA_ENDIAN_LITTLE or DMA_ENDIAN_BIG)
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_set_xfer_endianess(unsigned int ch, unsigned int src, unsigned int dst)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
sc->sc_channel[ch].reg_csdp &= ~DMA4_CSDP_SRC_ENDIANISM(1);
sc->sc_channel[ch].reg_csdp |= DMA4_CSDP_SRC_ENDIANISM(src);
sc->sc_channel[ch].reg_csdp &= ~DMA4_CSDP_DST_ENDIANISM(1);
sc->sc_channel[ch].reg_csdp |= DMA4_CSDP_DST_ENDIANISM(dst);
sc->sc_channel[ch].need_reg_write = 1;
TI_SDMA_UNLOCK(sc);
return 0;
}
/**
* ti_sdma_set_xfer_burst - sets the source and destination element size
* @ch: the channel number to set the burst settings of
* @src: the source endianess (either DMA_BURST_NONE, DMA_BURST_16, DMA_BURST_32
* or DMA_BURST_64)
* @dst: the destination endianess (either DMA_BURST_NONE, DMA_BURST_16,
* DMA_BURST_32 or DMA_BURST_64)
*
* This function sets the size of the elements for all subsequent transfers.
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_set_xfer_burst(unsigned int ch, unsigned int src, unsigned int dst)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
sc->sc_channel[ch].reg_csdp &= ~DMA4_CSDP_SRC_BURST_MODE(0x3);
sc->sc_channel[ch].reg_csdp |= DMA4_CSDP_SRC_BURST_MODE(src);
sc->sc_channel[ch].reg_csdp &= ~DMA4_CSDP_DST_BURST_MODE(0x3);
sc->sc_channel[ch].reg_csdp |= DMA4_CSDP_DST_BURST_MODE(dst);
sc->sc_channel[ch].need_reg_write = 1;
TI_SDMA_UNLOCK(sc);
return 0;
}
/**
* ti_sdma_set_xfer_data_type - driver attach function
* @ch: the channel number to set the endianess of
* @type: the xfer data type (either DMA_DATA_8BITS_SCALAR, DMA_DATA_16BITS_SCALAR
* or DMA_DATA_32BITS_SCALAR)
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_set_xfer_data_type(unsigned int ch, unsigned int type)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
sc->sc_channel[ch].reg_csdp &= ~DMA4_CSDP_DATA_TYPE(0x3);
sc->sc_channel[ch].reg_csdp |= DMA4_CSDP_DATA_TYPE(type);
sc->sc_channel[ch].need_reg_write = 1;
TI_SDMA_UNLOCK(sc);
return 0;
}
/**
* ti_sdma_set_callback - driver attach function
* @dev: dma device handle
*
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_set_callback(unsigned int ch,
void (*callback)(unsigned int ch, uint32_t status, void *data),
void *data)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
sc->sc_channel[ch].callback = callback;
sc->sc_channel[ch].callback_data = data;
sc->sc_channel[ch].need_reg_write = 1;
TI_SDMA_UNLOCK(sc);
return 0;
}
/**
* ti_sdma_sync_params - sets channel sync settings
* @ch: the channel number to set the sync on
* @trigger: the number of the sync trigger, this depends on what other H/W
* module is triggering/receiving the DMA transactions
* @mode: flags describing the sync mode to use, it may have one or more of
* the following bits set; TI_SDMA_SYNC_FRAME,
* TI_SDMA_SYNC_BLOCK, TI_SDMA_SYNC_TRIG_ON_SRC.
*
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_sync_params(unsigned int ch, unsigned int trigger, unsigned int mode)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
uint32_t ccr;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
ccr = sc->sc_channel[ch].reg_ccr;
ccr &= ~DMA4_CCR_SYNC_TRIGGER(0x7F);
ccr |= DMA4_CCR_SYNC_TRIGGER(trigger + 1);
if (mode & TI_SDMA_SYNC_FRAME)
ccr |= DMA4_CCR_FRAME_SYNC(1);
else
ccr &= ~DMA4_CCR_FRAME_SYNC(1);
if (mode & TI_SDMA_SYNC_BLOCK)
ccr |= DMA4_CCR_BLOCK_SYNC(1);
else
ccr &= ~DMA4_CCR_BLOCK_SYNC(1);
if (mode & TI_SDMA_SYNC_TRIG_ON_SRC)
ccr |= DMA4_CCR_SEL_SRC_DST_SYNC(1);
else
ccr &= ~DMA4_CCR_SEL_SRC_DST_SYNC(1);
sc->sc_channel[ch].reg_ccr = ccr;
sc->sc_channel[ch].need_reg_write = 1;
TI_SDMA_UNLOCK(sc);
return 0;
}
/**
* ti_sdma_set_addr_mode - driver attach function
* @ch: the channel number to set the endianess of
* @rd_mode: the xfer source addressing mode (either DMA_ADDR_CONSTANT,
* DMA_ADDR_POST_INCREMENT, DMA_ADDR_SINGLE_INDEX or
* DMA_ADDR_DOUBLE_INDEX)
* @wr_mode: the xfer destination addressing mode (either DMA_ADDR_CONSTANT,
* DMA_ADDR_POST_INCREMENT, DMA_ADDR_SINGLE_INDEX or
* DMA_ADDR_DOUBLE_INDEX)
*
*
* LOCKING:
* DMA registers protected by internal mutex
*
* RETURNS:
* EH_HANDLED or EH_NOT_HANDLED
*/
int
ti_sdma_set_addr_mode(unsigned int ch, unsigned int src_mode,
unsigned int dst_mode)
{
struct ti_sdma_softc *sc = ti_sdma_sc;
uint32_t ccr;
/* Sanity check */
if (sc == NULL)
return (ENOMEM);
TI_SDMA_LOCK(sc);
if ((sc->sc_active_channels & (1 << ch)) == 0) {
TI_SDMA_UNLOCK(sc);
return (EINVAL);
}
ccr = sc->sc_channel[ch].reg_ccr;
ccr &= ~DMA4_CCR_SRC_ADDRESS_MODE(0x3);
ccr |= DMA4_CCR_SRC_ADDRESS_MODE(src_mode);
ccr &= ~DMA4_CCR_DST_ADDRESS_MODE(0x3);
ccr |= DMA4_CCR_DST_ADDRESS_MODE(dst_mode);
sc->sc_channel[ch].reg_ccr = ccr;
sc->sc_channel[ch].need_reg_write = 1;
TI_SDMA_UNLOCK(sc);
return 0;
}
/**
* ti_sdma_probe - driver probe function
* @dev: dma device handle
*
*
*
* RETURNS:
* Always returns 0.
*/
static int
ti_sdma_probe(device_t dev)
{
if (!ofw_bus_is_compatible(dev, "ti,sdma"))
return (ENXIO);
device_set_desc(dev, "TI sDMA Controller");
return (0);
}
/**
* ti_sdma_attach - driver attach function
* @dev: dma device handle
*
* Initialises memory mapping/pointers to the DMA register set and requests
* IRQs. This is effectively the setup function for the driver.
*
* RETURNS:
* 0 on success or a negative error code failure.
*/
static int
ti_sdma_attach(device_t dev)
{
struct ti_sdma_softc *sc = device_get_softc(dev);
unsigned int timeout;
unsigned int i;
int rid;
void *ihl;
int err;
/* Setup the basics */
sc->sc_dev = dev;
/* No channels active at the moment */
sc->sc_active_channels = 0x00000000;
/* Mutex to protect the shared data structures */
TI_SDMA_LOCK_INIT(sc);
/* Get the memory resource for the register mapping */
rid = 0;
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (sc->sc_mem_res == NULL)
panic("%s: Cannot map registers", device_get_name(dev));
/* Enable the interface and functional clocks */
ti_prcm_clk_enable(SDMA_CLK);
/* Read the sDMA revision register and sanity check it's known */
sc->sc_hw_rev = ti_sdma_read_4(sc, DMA4_REVISION);
device_printf(dev, "sDMA revision %08x\n", sc->sc_hw_rev);
if (!ti_sdma_is_omap4_rev(sc) && !ti_sdma_is_omap3_rev(sc)) {
device_printf(sc->sc_dev, "error - unknown sDMA H/W revision\n");
return (EINVAL);
}
/* Disable all interrupts */
for (i = 0; i < NUM_DMA_IRQS; i++) {
ti_sdma_write_4(sc, DMA4_IRQENABLE_L(i), 0x00000000);
}
/* Soft-reset is only supported on pre-OMAP44xx devices */
if (ti_sdma_is_omap3_rev(sc)) {
/* Soft-reset */
ti_sdma_write_4(sc, DMA4_OCP_SYSCONFIG, 0x0002);
/* Set the timeout to 100ms*/
timeout = (hz < 10) ? 1 : ((100 * hz) / 1000);
/* Wait for DMA reset to complete */
while ((ti_sdma_read_4(sc, DMA4_SYSSTATUS) & 0x1) == 0x0) {
/* Sleep for a tick */
pause("DMARESET", 1);
if (timeout-- == 0) {
device_printf(sc->sc_dev, "sDMA reset operation timed out\n");
return (EINVAL);
}
}
}
/*
* Install interrupt handlers for the for possible interrupts. Any channel
* can trip one of the four IRQs
*/
rid = 0;
sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE | RF_SHAREABLE);
if (sc->sc_irq_res == NULL)
panic("Unable to setup the dma irq handler.\n");
err = bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
NULL, ti_sdma_intr, NULL, &ihl);
if (err)
panic("%s: Cannot register IRQ", device_get_name(dev));
/* Store the DMA structure globally ... this driver should never be unloaded */
ti_sdma_sc = sc;
return (0);
}
static device_method_t ti_sdma_methods[] = {
DEVMETHOD(device_probe, ti_sdma_probe),
DEVMETHOD(device_attach, ti_sdma_attach),
{0, 0},
};
static driver_t ti_sdma_driver = {
"ti_sdma",
ti_sdma_methods,
sizeof(struct ti_sdma_softc),
};
static devclass_t ti_sdma_devclass;
DRIVER_MODULE(ti_sdma, simplebus, ti_sdma_driver, ti_sdma_devclass, 0, 0);
MODULE_DEPEND(ti_sdma, ti_prcm, 1, 1, 1);
Reference in New Issue View Git Blame Copy Permalink