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qemu-e2k/hw/dma/xlnx_csu_dma.c
Peter Maydell 9598c1bb39 ptimer: Rename PTIMER_POLICY_DEFAULT to PTIMER_POLICY_LEGACY 
The traditional ptimer behaviour includes a collection of weird edge
case behaviours.  In 2016 we improved the ptimer implementation to
fix these and generally make the behaviour more flexible, with
ptimers opting in to the new behaviour by passing an appropriate set
of policy flags to ptimer_init().  For backwards-compatibility, we
defined PTIMER_POLICY_DEFAULT (which sets no flags) to give the old
weird behaviour.

This turns out to be a poor choice of name, because people writing
new devices which use ptimers are misled into thinking that the
default is probably a sensible choice of flags, when in fact it is
almost always not what you want.  Rename PTIMER_POLICY_DEFAULT to
PTIMER_POLICY_LEGACY and beef up the comment to more clearly say that
new devices should not be using it.

The code-change part of this commit was produced by
  sed -i -e 's/PTIMER_POLICY_DEFAULT/PTIMER_POLICY_LEGACY/g' $(git grep -l PTIMER_POLICY_DEFAULT)
with the exception of a test name string change in
tests/unit/ptimer-test.c which was added manually.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Francisco Iglesias <francisco.iglesias@amd.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220516103058.162280-1-peter.maydell@linaro.org
2022-05-19 16:19:03 +01:00

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/*
* Xilinx Platform CSU Stream DMA emulation
*
* This implementation is based on
* https://github.com/Xilinx/qemu/blob/master/hw/dma/csu_stream_dma.c
*
* 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 or
* (at your option) version 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qapi/error.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "sysemu/dma.h"
#include "hw/ptimer.h"
#include "hw/stream.h"
#include "hw/register.h"
#include "hw/dma/xlnx_csu_dma.h"
/*
* Ref: UG1087 (v1.7) February 8, 2019
* https://www.xilinx.com/html_docs/registers/ug1087/ug1087-zynq-ultrascale-registers.html
* CSUDMA Module section
*/
REG32(ADDR, 0x0)
FIELD(ADDR, ADDR, 2, 30) /* wo */
REG32(SIZE, 0x4)
FIELD(SIZE, SIZE, 2, 27) /* wo */
FIELD(SIZE, LAST_WORD, 0, 1) /* rw, only exists in SRC */
REG32(STATUS, 0x8)
FIELD(STATUS, DONE_CNT, 13, 3) /* wtc */
FIELD(STATUS, FIFO_LEVEL, 5, 8) /* ro */
FIELD(STATUS, OUTSTANDING, 1, 4) /* ro */
FIELD(STATUS, BUSY, 0, 1) /* ro */
REG32(CTRL, 0xc)
FIELD(CTRL, FIFOTHRESH, 25, 7) /* rw, only exists in DST, reset 0x40 */
FIELD(CTRL, APB_ERR_RESP, 24, 1) /* rw */
FIELD(CTRL, ENDIANNESS, 23, 1) /* rw */
FIELD(CTRL, AXI_BRST_TYPE, 22, 1) /* rw */
FIELD(CTRL, TIMEOUT_VAL, 10, 12) /* rw, reset: 0xFFE */
FIELD(CTRL, FIFO_THRESH, 2, 8) /* rw, reset: 0x80 */
FIELD(CTRL, PAUSE_STRM, 1, 1) /* rw */
FIELD(CTRL, PAUSE_MEM, 0, 1) /* rw */
REG32(CRC, 0x10)
REG32(INT_STATUS, 0x14)
FIELD(INT_STATUS, FIFO_OVERFLOW, 7, 1) /* wtc */
FIELD(INT_STATUS, INVALID_APB, 6, 1) /* wtc */
FIELD(INT_STATUS, THRESH_HIT, 5, 1) /* wtc */
FIELD(INT_STATUS, TIMEOUT_MEM, 4, 1) /* wtc */
FIELD(INT_STATUS, TIMEOUT_STRM, 3, 1) /* wtc */
FIELD(INT_STATUS, AXI_BRESP_ERR, 2, 1) /* wtc, SRC: AXI_RDERR */
FIELD(INT_STATUS, DONE, 1, 1) /* wtc */
FIELD(INT_STATUS, MEM_DONE, 0, 1) /* wtc */
REG32(INT_ENABLE, 0x18)
FIELD(INT_ENABLE, FIFO_OVERFLOW, 7, 1) /* wtc */
FIELD(INT_ENABLE, INVALID_APB, 6, 1) /* wtc */
FIELD(INT_ENABLE, THRESH_HIT, 5, 1) /* wtc */
FIELD(INT_ENABLE, TIMEOUT_MEM, 4, 1) /* wtc */
FIELD(INT_ENABLE, TIMEOUT_STRM, 3, 1) /* wtc */
FIELD(INT_ENABLE, AXI_BRESP_ERR, 2, 1) /* wtc, SRC: AXI_RDERR */
FIELD(INT_ENABLE, DONE, 1, 1) /* wtc */
FIELD(INT_ENABLE, MEM_DONE, 0, 1) /* wtc */
REG32(INT_DISABLE, 0x1c)
FIELD(INT_DISABLE, FIFO_OVERFLOW, 7, 1) /* wtc */
FIELD(INT_DISABLE, INVALID_APB, 6, 1) /* wtc */
FIELD(INT_DISABLE, THRESH_HIT, 5, 1) /* wtc */
FIELD(INT_DISABLE, TIMEOUT_MEM, 4, 1) /* wtc */
FIELD(INT_DISABLE, TIMEOUT_STRM, 3, 1) /* wtc */
FIELD(INT_DISABLE, AXI_BRESP_ERR, 2, 1) /* wtc, SRC: AXI_RDERR */
FIELD(INT_DISABLE, DONE, 1, 1) /* wtc */
FIELD(INT_DISABLE, MEM_DONE, 0, 1) /* wtc */
REG32(INT_MASK, 0x20)
FIELD(INT_MASK, FIFO_OVERFLOW, 7, 1) /* ro, reset: 0x1 */
FIELD(INT_MASK, INVALID_APB, 6, 1) /* ro, reset: 0x1 */
FIELD(INT_MASK, THRESH_HIT, 5, 1) /* ro, reset: 0x1 */
FIELD(INT_MASK, TIMEOUT_MEM, 4, 1) /* ro, reset: 0x1 */
FIELD(INT_MASK, TIMEOUT_STRM, 3, 1) /* ro, reset: 0x1 */
FIELD(INT_MASK, AXI_BRESP_ERR, 2, 1) /* ro, reset: 0x1, SRC: AXI_RDERR */
FIELD(INT_MASK, DONE, 1, 1) /* ro, reset: 0x1 */
FIELD(INT_MASK, MEM_DONE, 0, 1) /* ro, reset: 0x1 */
REG32(CTRL2, 0x24)
FIELD(CTRL2, ARCACHE, 24, 3) /* rw */
FIELD(CTRL2, ROUTE_BIT, 23, 1) /* rw */
FIELD(CTRL2, TIMEOUT_EN, 22, 1) /* rw */
FIELD(CTRL2, TIMEOUT_PRE, 4, 12) /* rw, reset: 0xFFF */
FIELD(CTRL2, MAX_OUTS_CMDS, 0, 4) /* rw, reset: 0x8 */
REG32(ADDR_MSB, 0x28)
FIELD(ADDR_MSB, ADDR_MSB, 0, 17) /* wo */
#define R_CTRL_TIMEOUT_VAL_RESET (0xFFE)
#define R_CTRL_FIFO_THRESH_RESET (0x80)
#define R_CTRL_FIFOTHRESH_RESET (0x40)
#define R_CTRL2_TIMEOUT_PRE_RESET (0xFFF)
#define R_CTRL2_MAX_OUTS_CMDS_RESET (0x8)
#define XLNX_CSU_DMA_ERR_DEBUG (0)
#define XLNX_CSU_DMA_INT_R_MASK (0xff)
/* UG1807: Set the prescaler value for the timeout in clk (~2.5ns) cycles */
#define XLNX_CSU_DMA_TIMER_FREQ (400 * 1000 * 1000)
static bool xlnx_csu_dma_is_paused(XlnxCSUDMA *s)
{
bool paused;
paused = !!(s->regs[R_CTRL] & R_CTRL_PAUSE_STRM_MASK);
paused |= !!(s->regs[R_CTRL] & R_CTRL_PAUSE_MEM_MASK);
return paused;
}
static bool xlnx_csu_dma_get_eop(XlnxCSUDMA *s)
{
return s->r_size_last_word;
}
static bool xlnx_csu_dma_burst_is_fixed(XlnxCSUDMA *s)
{
return !!(s->regs[R_CTRL] & R_CTRL_AXI_BRST_TYPE_MASK);
}
static bool xlnx_csu_dma_timeout_enabled(XlnxCSUDMA *s)
{
return !!(s->regs[R_CTRL2] & R_CTRL2_TIMEOUT_EN_MASK);
}
static void xlnx_csu_dma_update_done_cnt(XlnxCSUDMA *s, int a)
{
int cnt;
/* Increase DONE_CNT */
cnt = ARRAY_FIELD_EX32(s->regs, STATUS, DONE_CNT) + a;
ARRAY_FIELD_DP32(s->regs, STATUS, DONE_CNT, cnt);
}
static void xlnx_csu_dma_data_process(XlnxCSUDMA *s, uint8_t *buf, uint32_t len)
{
uint32_t bswap;
uint32_t i;
bswap = s->regs[R_CTRL] & R_CTRL_ENDIANNESS_MASK;
if (s->is_dst && !bswap) {
/* Fast when ENDIANNESS cleared */
return;
}
for (i = 0; i < len; i += 4) {
uint8_t *b = &buf[i];
union {
uint8_t u8[4];
uint32_t u32;
} v = {
.u8 = { b[0], b[1], b[2], b[3] }
};
if (!s->is_dst) {
s->regs[R_CRC] += v.u32;
}
if (bswap) {
/*
* No point using bswap, we need to writeback
* into a potentially unaligned pointer.
*/
b[0] = v.u8[3];
b[1] = v.u8[2];
b[2] = v.u8[1];
b[3] = v.u8[0];
}
}
}
static void xlnx_csu_dma_update_irq(XlnxCSUDMA *s)
{
qemu_set_irq(s->irq, !!(s->regs[R_INT_STATUS] & ~s->regs[R_INT_MASK]));
}
/* len is in bytes */
static uint32_t xlnx_csu_dma_read(XlnxCSUDMA *s, uint8_t *buf, uint32_t len)
{
hwaddr addr = (hwaddr)s->regs[R_ADDR_MSB] << 32 | s->regs[R_ADDR];
MemTxResult result = MEMTX_OK;
if (xlnx_csu_dma_burst_is_fixed(s)) {
uint32_t i;
for (i = 0; i < len && (result == MEMTX_OK); i += s->width) {
uint32_t mlen = MIN(len - i, s->width);
result = address_space_rw(&s->dma_as, addr, s->attr,
buf + i, mlen, false);
}
} else {
result = address_space_rw(&s->dma_as, addr, s->attr, buf, len, false);
}
if (result == MEMTX_OK) {
xlnx_csu_dma_data_process(s, buf, len);
} else {
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address " TARGET_FMT_plx
" for mem read", __func__, addr);
s->regs[R_INT_STATUS] |= R_INT_STATUS_AXI_BRESP_ERR_MASK;
xlnx_csu_dma_update_irq(s);
}
return len;
}
/* len is in bytes */
static uint32_t xlnx_csu_dma_write(XlnxCSUDMA *s, uint8_t *buf, uint32_t len)
{
hwaddr addr = (hwaddr)s->regs[R_ADDR_MSB] << 32 | s->regs[R_ADDR];
MemTxResult result = MEMTX_OK;
xlnx_csu_dma_data_process(s, buf, len);
if (xlnx_csu_dma_burst_is_fixed(s)) {
uint32_t i;
for (i = 0; i < len && (result == MEMTX_OK); i += s->width) {
uint32_t mlen = MIN(len - i, s->width);
result = address_space_rw(&s->dma_as, addr, s->attr,
buf, mlen, true);
buf += mlen;
}
} else {
result = address_space_rw(&s->dma_as, addr, s->attr, buf, len, true);
}
if (result != MEMTX_OK) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address " TARGET_FMT_plx
" for mem write", __func__, addr);
s->regs[R_INT_STATUS] |= R_INT_STATUS_AXI_BRESP_ERR_MASK;
xlnx_csu_dma_update_irq(s);
}
return len;
}
static void xlnx_csu_dma_done(XlnxCSUDMA *s)
{
s->regs[R_STATUS] &= ~R_STATUS_BUSY_MASK;
s->regs[R_INT_STATUS] |= R_INT_STATUS_DONE_MASK;
if (!s->is_dst) {
s->regs[R_INT_STATUS] |= R_INT_STATUS_MEM_DONE_MASK;
}
xlnx_csu_dma_update_done_cnt(s, 1);
}
static uint32_t xlnx_csu_dma_advance(XlnxCSUDMA *s, uint32_t len)
{
uint32_t size = s->regs[R_SIZE];
hwaddr dst = (hwaddr)s->regs[R_ADDR_MSB] << 32 | s->regs[R_ADDR];
assert(len <= size);
size -= len;
s->regs[R_SIZE] = size;
if (!xlnx_csu_dma_burst_is_fixed(s)) {
dst += len;
s->regs[R_ADDR] = (uint32_t) dst;
s->regs[R_ADDR_MSB] = dst >> 32;
}
if (size == 0) {
xlnx_csu_dma_done(s);
}
return size;
}
static void xlnx_csu_dma_src_notify(void *opaque)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(opaque);
unsigned char buf[4 * 1024];
size_t rlen = 0;
ptimer_transaction_begin(s->src_timer);
/* Stop the backpreassure timer */
ptimer_stop(s->src_timer);
while (s->regs[R_SIZE] && !xlnx_csu_dma_is_paused(s) &&
stream_can_push(s->tx_dev, xlnx_csu_dma_src_notify, s)) {
uint32_t plen = MIN(s->regs[R_SIZE], sizeof buf);
bool eop = false;
/* Did we fit it all? */
if (s->regs[R_SIZE] == plen && xlnx_csu_dma_get_eop(s)) {
eop = true;
}
/* DMA transfer */
xlnx_csu_dma_read(s, buf, plen);
rlen = stream_push(s->tx_dev, buf, plen, eop);
xlnx_csu_dma_advance(s, rlen);
}
if (xlnx_csu_dma_timeout_enabled(s) && s->regs[R_SIZE] &&
!stream_can_push(s->tx_dev, xlnx_csu_dma_src_notify, s)) {
uint32_t timeout = ARRAY_FIELD_EX32(s->regs, CTRL, TIMEOUT_VAL);
uint32_t div = ARRAY_FIELD_EX32(s->regs, CTRL2, TIMEOUT_PRE) + 1;
uint32_t freq = XLNX_CSU_DMA_TIMER_FREQ;
freq /= div;
ptimer_set_freq(s->src_timer, freq);
ptimer_set_count(s->src_timer, timeout);
ptimer_run(s->src_timer, 1);
}
ptimer_transaction_commit(s->src_timer);
xlnx_csu_dma_update_irq(s);
}
static uint64_t addr_pre_write(RegisterInfo *reg, uint64_t val)
{
/* Address is word aligned */
return val & R_ADDR_ADDR_MASK;
}
static uint64_t size_pre_write(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
if (s->regs[R_SIZE] != 0) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Starting DMA while already running.\n", __func__);
}
if (!s->is_dst) {
s->r_size_last_word = !!(val & R_SIZE_LAST_WORD_MASK);
}
/* Size is word aligned */
return val & R_SIZE_SIZE_MASK;
}
static uint64_t size_post_read(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
return val | s->r_size_last_word;
}
static void size_post_write(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
s->regs[R_STATUS] |= R_STATUS_BUSY_MASK;
/*
* Note that if SIZE is programmed to 0, and the DMA is started,
* the interrupts DONE and MEM_DONE will be asserted.
*/
if (s->regs[R_SIZE] == 0) {
xlnx_csu_dma_done(s);
xlnx_csu_dma_update_irq(s);
return;
}
/* Set SIZE is considered the last step in transfer configuration */
if (!s->is_dst) {
xlnx_csu_dma_src_notify(s);
} else {
if (s->notify) {
s->notify(s->notify_opaque);
}
}
}
static uint64_t status_pre_write(RegisterInfo *reg, uint64_t val)
{
return val & (R_STATUS_DONE_CNT_MASK | R_STATUS_BUSY_MASK);
}
static void ctrl_post_write(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
if (!s->is_dst) {
if (!xlnx_csu_dma_is_paused(s)) {
xlnx_csu_dma_src_notify(s);
}
} else {
if (!xlnx_csu_dma_is_paused(s) && s->notify) {
s->notify(s->notify_opaque);
}
}
}
static uint64_t int_status_pre_write(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
/* DMA counter decrements when flag 'DONE' is cleared */
if ((val & s->regs[R_INT_STATUS] & R_INT_STATUS_DONE_MASK)) {
xlnx_csu_dma_update_done_cnt(s, -1);
}
return s->regs[R_INT_STATUS] & ~val;
}
static void int_status_post_write(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
xlnx_csu_dma_update_irq(s);
}
static uint64_t int_enable_pre_write(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
uint32_t v32 = val;
/*
* R_INT_ENABLE doesn't have its own state.
* It is used to indirectly modify R_INT_MASK.
*
* 1: Enable this interrupt field (the mask bit will be cleared to 0)
* 0: No effect
*/
s->regs[R_INT_MASK] &= ~v32;
return 0;
}
static void int_enable_post_write(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
xlnx_csu_dma_update_irq(s);
}
static uint64_t int_disable_pre_write(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
uint32_t v32 = val;
/*
* R_INT_DISABLE doesn't have its own state.
* It is used to indirectly modify R_INT_MASK.
*
* 1: Disable this interrupt field (the mask bit will be set to 1)
* 0: No effect
*/
s->regs[R_INT_MASK] |= v32;
return 0;
}
static void int_disable_post_write(RegisterInfo *reg, uint64_t val)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(reg->opaque);
xlnx_csu_dma_update_irq(s);
}
static uint64_t addr_msb_pre_write(RegisterInfo *reg, uint64_t val)
{
return val & R_ADDR_MSB_ADDR_MSB_MASK;
}
static MemTxResult xlnx_csu_dma_class_read(XlnxCSUDMA *s, hwaddr addr,
uint32_t len)
{
RegisterInfo *reg = &s->regs_info[R_SIZE];
uint64_t we = MAKE_64BIT_MASK(0, 4 * 8);
s->regs[R_ADDR] = addr;
s->regs[R_ADDR_MSB] = (uint64_t)addr >> 32;
register_write(reg, len, we, object_get_typename(OBJECT(s)), false);
return (s->regs[R_SIZE] == 0) ? MEMTX_OK : MEMTX_ERROR;
}
static const RegisterAccessInfo *xlnx_csu_dma_regs_info[] = {
#define DMACH_REGINFO(NAME, snd) \
(const RegisterAccessInfo []) { \
{ \
.name = #NAME "_ADDR", \
.addr = A_ADDR, \
.pre_write = addr_pre_write \
}, { \
.name = #NAME "_SIZE", \
.addr = A_SIZE, \
.pre_write = size_pre_write, \
.post_write = size_post_write, \
.post_read = size_post_read \
}, { \
.name = #NAME "_STATUS", \
.addr = A_STATUS, \
.pre_write = status_pre_write, \
.w1c = R_STATUS_DONE_CNT_MASK, \
.ro = (R_STATUS_BUSY_MASK \
| R_STATUS_FIFO_LEVEL_MASK \
| R_STATUS_OUTSTANDING_MASK) \
}, { \
.name = #NAME "_CTRL", \
.addr = A_CTRL, \
.post_write = ctrl_post_write, \
.reset = ((R_CTRL_TIMEOUT_VAL_RESET << R_CTRL_TIMEOUT_VAL_SHIFT) \
| (R_CTRL_FIFO_THRESH_RESET << R_CTRL_FIFO_THRESH_SHIFT)\
| (snd ? 0 : R_CTRL_FIFOTHRESH_RESET \
<< R_CTRL_FIFOTHRESH_SHIFT)) \
}, { \
.name = #NAME "_CRC", \
.addr = A_CRC, \
}, { \
.name = #NAME "_INT_STATUS", \
.addr = A_INT_STATUS, \
.pre_write = int_status_pre_write, \
.post_write = int_status_post_write \
}, { \
.name = #NAME "_INT_ENABLE", \
.addr = A_INT_ENABLE, \
.pre_write = int_enable_pre_write, \
.post_write = int_enable_post_write \
}, { \
.name = #NAME "_INT_DISABLE", \
.addr = A_INT_DISABLE, \
.pre_write = int_disable_pre_write, \
.post_write = int_disable_post_write \
}, { \
.name = #NAME "_INT_MASK", \
.addr = A_INT_MASK, \
.ro = ~0, \
.reset = XLNX_CSU_DMA_INT_R_MASK \
}, { \
.name = #NAME "_CTRL2", \
.addr = A_CTRL2, \
.reset = ((R_CTRL2_TIMEOUT_PRE_RESET \
<< R_CTRL2_TIMEOUT_PRE_SHIFT) \
| (R_CTRL2_MAX_OUTS_CMDS_RESET \
<< R_CTRL2_MAX_OUTS_CMDS_SHIFT)) \
}, { \
.name = #NAME "_ADDR_MSB", \
.addr = A_ADDR_MSB, \
.pre_write = addr_msb_pre_write \
} \
}
DMACH_REGINFO(DMA_SRC, true),
DMACH_REGINFO(DMA_DST, false)
};
static const MemoryRegionOps xlnx_csu_dma_ops = {
.read = register_read_memory,
.write = register_write_memory,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
}
};
static void xlnx_csu_dma_src_timeout_hit(void *opaque)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(opaque);
/* Ignore if the timeout is masked */
if (!xlnx_csu_dma_timeout_enabled(s)) {
return;
}
s->regs[R_INT_STATUS] |= R_INT_STATUS_TIMEOUT_STRM_MASK;
xlnx_csu_dma_update_irq(s);
}
static size_t xlnx_csu_dma_stream_push(StreamSink *obj, uint8_t *buf,
size_t len, bool eop)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(obj);
uint32_t size = s->regs[R_SIZE];
uint32_t mlen = MIN(size, len) & (~3); /* Size is word aligned */
/* Be called when it's DST */
assert(s->is_dst);
if (size == 0 || len <= 0) {
return 0;
}
if (len && (xlnx_csu_dma_is_paused(s) || mlen == 0)) {
qemu_log_mask(LOG_GUEST_ERROR,
"csu-dma: DST channel dropping %zd b of data.\n", len);
s->regs[R_INT_STATUS] |= R_INT_STATUS_FIFO_OVERFLOW_MASK;
return len;
}
if (xlnx_csu_dma_write(s, buf, mlen) != mlen) {
return 0;
}
xlnx_csu_dma_advance(s, mlen);
xlnx_csu_dma_update_irq(s);
return mlen;
}
static bool xlnx_csu_dma_stream_can_push(StreamSink *obj,
StreamCanPushNotifyFn notify,
void *notify_opaque)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(obj);
if (s->regs[R_SIZE] != 0) {
return true;
} else {
s->notify = notify;
s->notify_opaque = notify_opaque;
return false;
}
}
static void xlnx_csu_dma_reset(DeviceState *dev)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(dev);
unsigned int i;
for (i = 0; i < ARRAY_SIZE(s->regs_info); ++i) {
register_reset(&s->regs_info[i]);
}
}
static void xlnx_csu_dma_realize(DeviceState *dev, Error **errp)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(dev);
RegisterInfoArray *reg_array;
if (!s->is_dst && !s->tx_dev) {
error_setg(errp, "zynqmp.csu-dma: Stream not connected");
return;
}
if (!s->dma_mr) {
error_setg(errp, TYPE_XLNX_CSU_DMA " 'dma' link not set");
return;
}
address_space_init(&s->dma_as, s->dma_mr, "csu-dma");
reg_array =
register_init_block32(dev, xlnx_csu_dma_regs_info[!!s->is_dst],
XLNX_CSU_DMA_R_MAX,
s->regs_info, s->regs,
&xlnx_csu_dma_ops,
XLNX_CSU_DMA_ERR_DEBUG,
XLNX_CSU_DMA_R_MAX * 4);
memory_region_add_subregion(&s->iomem,
0x0,
&reg_array->mem);
sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq);
s->src_timer = ptimer_init(xlnx_csu_dma_src_timeout_hit,
s, PTIMER_POLICY_LEGACY);
s->attr = MEMTXATTRS_UNSPECIFIED;
s->r_size_last_word = 0;
}
static const VMStateDescription vmstate_xlnx_csu_dma = {
.name = TYPE_XLNX_CSU_DMA,
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_PTIMER(src_timer, XlnxCSUDMA),
VMSTATE_UINT16(width, XlnxCSUDMA),
VMSTATE_BOOL(is_dst, XlnxCSUDMA),
VMSTATE_BOOL(r_size_last_word, XlnxCSUDMA),
VMSTATE_UINT32_ARRAY(regs, XlnxCSUDMA, XLNX_CSU_DMA_R_MAX),
VMSTATE_END_OF_LIST(),
}
};
static Property xlnx_csu_dma_properties[] = {
/*
* Ref PG021, Stream Data Width:
* Data width in bits of the AXI S2MM AXI4-Stream Data bus.
* This value must be equal or less than the Memory Map Data Width.
* Valid values are 8, 16, 32, 64, 128, 512 and 1024.
* "dma-width" is the byte value of the "Stream Data Width".
*/
DEFINE_PROP_UINT16("dma-width", XlnxCSUDMA, width, 4),
/*
* The CSU DMA is a two-channel, simple DMA, allowing separate control of
* the SRC (read) channel and DST (write) channel. "is-dst" is used to mark
* which channel the device is connected to.
*/
DEFINE_PROP_BOOL("is-dst", XlnxCSUDMA, is_dst, true),
DEFINE_PROP_END_OF_LIST(),
};
static void xlnx_csu_dma_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
StreamSinkClass *ssc = STREAM_SINK_CLASS(klass);
XlnxCSUDMAClass *xcdc = XLNX_CSU_DMA_CLASS(klass);
dc->reset = xlnx_csu_dma_reset;
dc->realize = xlnx_csu_dma_realize;
dc->vmsd = &vmstate_xlnx_csu_dma;
device_class_set_props(dc, xlnx_csu_dma_properties);
ssc->push = xlnx_csu_dma_stream_push;
ssc->can_push = xlnx_csu_dma_stream_can_push;
xcdc->read = xlnx_csu_dma_class_read;
}
static void xlnx_csu_dma_init(Object *obj)
{
XlnxCSUDMA *s = XLNX_CSU_DMA(obj);
memory_region_init(&s->iomem, obj, TYPE_XLNX_CSU_DMA,
XLNX_CSU_DMA_R_MAX * 4);
object_property_add_link(obj, "stream-connected-dma", TYPE_STREAM_SINK,
(Object **)&s->tx_dev,
qdev_prop_allow_set_link_before_realize,
OBJ_PROP_LINK_STRONG);
object_property_add_link(obj, "dma", TYPE_MEMORY_REGION,
(Object **)&s->dma_mr,
qdev_prop_allow_set_link_before_realize,
OBJ_PROP_LINK_STRONG);
}
static const TypeInfo xlnx_csu_dma_info = {
.name = TYPE_XLNX_CSU_DMA,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(XlnxCSUDMA),
.class_init = xlnx_csu_dma_class_init,
.class_size = sizeof(XlnxCSUDMAClass),
.instance_init = xlnx_csu_dma_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_STREAM_SINK },
{ }
}
};
static void xlnx_csu_dma_register_types(void)
{
type_register_static(&xlnx_csu_dma_info);
}
type_init(xlnx_csu_dma_register_types)
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