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xilinx_spips: Generalised to model QSPI

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Extended the xilinx spips controller to model QSPI as well. Paremeterised the
operational difference with the normal spi controller (num_ss_bits, width of the
tx/rx fifo heads etc.). Multiple bus functionality is modelled (needed for QSPI
dual parallel mode. LQSPI is modelled.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
This commit is contained in:
Peter Crosthwaite 2012-10-15 14:37:04 +10:00
parent 419336a9f9
commit f12411440b
1 changed files with 256 additions and 35 deletions
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291
hw/xilinx_spips.c
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@ -28,6 +28,7 @@
#include "qemu-log.h"
#include "fifo.h"
#include "ssi.h"
#include "bitops.h"
#ifdef XILINX_SPIPS_ERR_DEBUG
#define DB_PRINT(...) do { \
@ -40,6 +41,8 @@
/* config register */
#define R_CONFIG (0x00 / 4)
#define IFMODE (1 << 31)
#define ENDIAN (1 << 26)
#define MODEFAIL_GEN_EN (1 << 17)
#define MAN_START_COM (1 << 16)
#define MAN_START_EN (1 << 15)
@ -75,45 +78,101 @@
#define R_SLAVE_IDLE_COUNT (0x24 / 4)
#define R_TX_THRES (0x28 / 4)
#define R_RX_THRES (0x2C / 4)
#define R_TXD1 (0x80 / 4)
#define R_TXD2 (0x84 / 4)
#define R_TXD3 (0x88 / 4)
#define R_LQSPI_CFG (0xa0 / 4)
#define R_LQSPI_CFG_RESET 0x03A002EB
#define LQSPI_CFG_LQ_MODE (1 << 31)
#define LQSPI_CFG_TWO_MEM (1 << 30)
#define LQSPI_CFG_SEP_BUS (1 << 30)
#define LQSPI_CFG_U_PAGE (1 << 28)
#define LQSPI_CFG_MODE_EN (1 << 25)
#define LQSPI_CFG_MODE_WIDTH 8
#define LQSPI_CFG_MODE_SHIFT 16
#define LQSPI_CFG_DUMMY_WIDTH 3
#define LQSPI_CFG_DUMMY_SHIFT 8
#define LQSPI_CFG_INST_CODE 0xFF
#define R_LQSPI_STS (0xA4 / 4)
#define LQSPI_STS_WR_RECVD (1 << 1)
#define R_MOD_ID (0xFC / 4)
#define R_MAX (R_MOD_ID+1)
/* size of TXRX FIFOs */
#define NUM_CS_LINES 4
#define RXFF_A 32
#define TXFF_A 32
/* 16MB per linear region */
#define LQSPI_ADDRESS_BITS 24
/* Bite off 4k chunks at a time */
#define LQSPI_CACHE_SIZE 1024
#define SNOOP_CHECKING 0xFF
#define SNOOP_NONE 0xFE
#define SNOOP_STRIPING 0
typedef struct {
SysBusDevice busdev;
MemoryRegion iomem;
MemoryRegion mmlqspi;
qemu_irq irq;
int irqline;
qemu_irq cs_lines[NUM_CS_LINES];
SSIBus *spi;
uint8_t num_cs;
uint8_t num_busses;
uint8_t snoop_state;
qemu_irq *cs_lines;
SSIBus **spi;
Fifo8 rx_fifo;
Fifo8 tx_fifo;
uint8_t num_txrx_bytes;
uint32_t regs[R_MAX];
uint32_t lqspi_buf[LQSPI_CACHE_SIZE];
hwaddr lqspi_cached_addr;
} XilinxSPIPS;
static inline int num_effective_busses(XilinxSPIPS *s)
{
return (s->regs[R_LQSPI_STS] & LQSPI_CFG_SEP_BUS &&
s->regs[R_LQSPI_STS] & LQSPI_CFG_TWO_MEM) ? s->num_busses : 1;
}
static void xilinx_spips_update_cs_lines(XilinxSPIPS *s)
{
int i;
int i, j;
bool found = false;
int field = s->regs[R_CONFIG] >> CS_SHIFT;
for (i = 0; i < NUM_CS_LINES; i++) {
if (~field & (1 << i) && !found) {
found = true;
DB_PRINT("selecting slave %d\n", i);
qemu_set_irq(s->cs_lines[i], 0);
} else {
qemu_set_irq(s->cs_lines[i], 1);
for (i = 0; i < s->num_cs; i++) {
for (j = 0; j < num_effective_busses(s); j++) {
int upage = !!(s->regs[R_LQSPI_STS] & LQSPI_CFG_U_PAGE);
int cs_to_set = (j * s->num_cs + i + upage) %
(s->num_cs * s->num_busses);
if (~field & (1 << i) && !found) {
DB_PRINT("selecting slave %d\n", i);
qemu_set_irq(s->cs_lines[cs_to_set], 0);
} else {
qemu_set_irq(s->cs_lines[cs_to_set], 1);
}
}
}
if (~field & (1 << i)) {
found = true;
}
}
if (!found) {
s->snoop_state = SNOOP_CHECKING;
}
}
static void xilinx_spips_update_ixr(XilinxSPIPS *s)
@ -154,6 +213,8 @@ static void xilinx_spips_reset(DeviceState *d)
s->regs[R_RX_THRES] = 1;
/* FIXME: move magic number definition somewhere sensible */
s->regs[R_MOD_ID] = 0x01090106;
s->regs[R_LQSPI_CFG] = R_LQSPI_CFG_RESET;
s->snoop_state = SNOOP_CHECKING;
xilinx_spips_update_ixr(s);
xilinx_spips_update_cs_lines(s);
}
@ -161,26 +222,68 @@ static void xilinx_spips_reset(DeviceState *d)
static void xilinx_spips_flush_txfifo(XilinxSPIPS *s)
{
for (;;) {
uint32_t r;
uint8_t value;
int i;
uint8_t rx;
uint8_t tx = 0;
if (fifo8_is_empty(&s->tx_fifo)) {
s->regs[R_INTR_STATUS] |= IXR_TX_FIFO_UNDERFLOW;
break;
} else {
value = fifo8_pop(&s->tx_fifo);
for (i = 0; i < num_effective_busses(s); ++i) {
if (!i || s->snoop_state == SNOOP_STRIPING) {
if (fifo8_is_empty(&s->tx_fifo)) {
s->regs[R_INTR_STATUS] |= IXR_TX_FIFO_UNDERFLOW;
xilinx_spips_update_ixr(s);
return;
} else {
tx = fifo8_pop(&s->tx_fifo);
}
}
rx = ssi_transfer(s->spi[i], (uint32_t)tx);
DB_PRINT("tx = %02x rx = %02x\n", tx, rx);
if (!i || s->snoop_state == SNOOP_STRIPING) {
if (fifo8_is_full(&s->rx_fifo)) {
s->regs[R_INTR_STATUS] |= IXR_RX_FIFO_OVERFLOW;
DB_PRINT("rx FIFO overflow");
} else {
fifo8_push(&s->rx_fifo, (uint8_t)rx);
}
}
}
r = ssi_transfer(s->spi, (uint32_t)value);
DB_PRINT("tx = %02x rx = %02x\n", value, r);
if (fifo8_is_full(&s->rx_fifo)) {
s->regs[R_INTR_STATUS] |= IXR_RX_FIFO_OVERFLOW;
DB_PRINT("rx FIFO overflow");
} else {
fifo8_push(&s->rx_fifo, (uint8_t)r);
switch (s->snoop_state) {
case (SNOOP_CHECKING):
switch (tx) { /* new instruction code */
case 0x0b: /* dual/quad output read DOR/QOR */
case 0x6b:
s->snoop_state = 4;
break;
/* FIXME: these vary between vendor - set to spansion */
case 0xbb: /* high performance dual read DIOR */
s->snoop_state = 4;
break;
case 0xeb: /* high performance quad read QIOR */
s->snoop_state = 6;
break;
default:
s->snoop_state = SNOOP_NONE;
}
break;
case (SNOOP_STRIPING):
case (SNOOP_NONE):
break;
default:
s->snoop_state--;
}
}
xilinx_spips_update_ixr(s);
}
static inline void rx_data_bytes(XilinxSPIPS *s, uint32_t *value, int max)
{
int i;
*value = 0;
for (i = 0; i < max && !fifo8_is_empty(&s->rx_fifo); ++i) {
uint32_t next = fifo8_pop(&s->rx_fifo) & 0xFF;
*value |= next << 8 * (s->regs[R_CONFIG] & ENDIAN ? 3-i : i);
}
}
static uint64_t xilinx_spips_read(void *opaque, hwaddr addr,
@ -214,7 +317,7 @@ static uint64_t xilinx_spips_read(void *opaque, hwaddr addr,
mask = 0;
break;
case R_RX_DATA:
ret = (uint32_t)fifo8_pop(&s->rx_fifo);
rx_data_bytes(s, &ret, s->num_txrx_bytes);
DB_PRINT("addr=" TARGET_FMT_plx " = %x\n", addr * 4, ret);
xilinx_spips_update_ixr(s);
return ret;
@ -224,6 +327,20 @@ static uint64_t xilinx_spips_read(void *opaque, hwaddr addr,
}
static inline void tx_data_bytes(XilinxSPIPS *s, uint32_t value, int num)
{
int i;
for (i = 0; i < num && !fifo8_is_full(&s->tx_fifo); ++i) {
if (s->regs[R_CONFIG] & ENDIAN) {
fifo8_push(&s->tx_fifo, (uint8_t)(value >> 24));
value <<= 8;
} else {
fifo8_push(&s->tx_fifo, (uint8_t)value);
value >>= 8;
}
}
}
static void xilinx_spips_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
@ -264,7 +381,16 @@ static void xilinx_spips_write(void *opaque, hwaddr addr,
mask = 0;
break;
case R_TX_DATA:
fifo8_push(&s->tx_fifo, (uint8_t)value);
tx_data_bytes(s, (uint32_t)value, s->num_txrx_bytes);
goto no_reg_update;
case R_TXD1:
tx_data_bytes(s, (uint32_t)value, 1);
goto no_reg_update;
case R_TXD2:
tx_data_bytes(s, (uint32_t)value, 2);
goto no_reg_update;
case R_TXD3:
tx_data_bytes(s, (uint32_t)value, 3);
goto no_reg_update;
}
s->regs[addr] = (s->regs[addr] & ~mask) | (value & mask);
@ -282,6 +408,81 @@ static const MemoryRegionOps spips_ops = {
.endianness = DEVICE_LITTLE_ENDIAN,
};
#define LQSPI_CACHE_SIZE 1024
static uint64_t
lqspi_read(void *opaque, hwaddr addr, unsigned int size)
{
int i;
XilinxSPIPS *s = opaque;
if (addr >= s->lqspi_cached_addr &&
addr <= s->lqspi_cached_addr + LQSPI_CACHE_SIZE - 4) {
return s->lqspi_buf[(addr - s->lqspi_cached_addr) >> 2];
} else {
int flash_addr = (addr / num_effective_busses(s));
int slave = flash_addr >> LQSPI_ADDRESS_BITS;
int cache_entry = 0;
DB_PRINT("config reg status: %08x\n", s->regs[R_LQSPI_CFG]);
fifo8_reset(&s->tx_fifo);
fifo8_reset(&s->rx_fifo);
s->regs[R_CONFIG] &= ~CS;
s->regs[R_CONFIG] |= (~(1 << slave) << CS_SHIFT) & CS;
xilinx_spips_update_cs_lines(s);
/* instruction */
DB_PRINT("pushing read instruction: %02x\n",
(uint8_t)(s->regs[R_LQSPI_CFG] & LQSPI_CFG_INST_CODE));
fifo8_push(&s->tx_fifo, s->regs[R_LQSPI_CFG] & LQSPI_CFG_INST_CODE);
/* read address */
DB_PRINT("pushing read address %06x\n", flash_addr);
fifo8_push(&s->tx_fifo, (uint8_t)(flash_addr >> 16));
fifo8_push(&s->tx_fifo, (uint8_t)(flash_addr >> 8));
fifo8_push(&s->tx_fifo, (uint8_t)flash_addr);
/* mode bits */
if (s->regs[R_LQSPI_CFG] & LQSPI_CFG_MODE_EN) {
fifo8_push(&s->tx_fifo, extract32(s->regs[R_LQSPI_CFG],
LQSPI_CFG_MODE_SHIFT,
LQSPI_CFG_MODE_WIDTH));
}
/* dummy bytes */
for (i = 0; i < (extract32(s->regs[R_LQSPI_CFG], LQSPI_CFG_DUMMY_SHIFT,
LQSPI_CFG_DUMMY_WIDTH)); ++i) {
DB_PRINT("pushing dummy byte\n");
fifo8_push(&s->tx_fifo, 0);
}
xilinx_spips_flush_txfifo(s);
fifo8_reset(&s->rx_fifo);
DB_PRINT("starting QSPI data read\n");
for (i = 0; i < LQSPI_CACHE_SIZE / 4; ++i) {
tx_data_bytes(s, 0, 4);
xilinx_spips_flush_txfifo(s);
rx_data_bytes(s, &s->lqspi_buf[cache_entry], 4);
cache_entry++;
}
s->regs[R_CONFIG] |= CS;
xilinx_spips_update_cs_lines(s);
s->lqspi_cached_addr = addr;
return lqspi_read(opaque, addr, size);
}
}
static const MemoryRegionOps lqspi_ops = {
.read = lqspi_read,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4
}
};
static int xilinx_spips_init(SysBusDevice *dev)
{
XilinxSPIPS *s = FROM_SYSBUS(typeof(*s), dev);
@ -289,18 +490,30 @@ static int xilinx_spips_init(SysBusDevice *dev)
DB_PRINT("inited device model\n");
s->spi = ssi_create_bus(&dev->qdev, "spi");
s->spi = g_new(SSIBus *, s->num_busses);
for (i = 0; i < s->num_busses; ++i) {
char bus_name[16];
snprintf(bus_name, 16, "spi%d", i);
s->spi[i] = ssi_create_bus(&dev->qdev, bus_name);
}
ssi_auto_connect_slaves(DEVICE(s), s->cs_lines, s->spi);
s->cs_lines = g_new(qemu_irq, s->num_cs * s->num_busses);
ssi_auto_connect_slaves(DEVICE(s), s->cs_lines, s->spi[0]);
ssi_auto_connect_slaves(DEVICE(s), s->cs_lines, s->spi[1]);
sysbus_init_irq(dev, &s->irq);
for (i = 0; i < NUM_CS_LINES; ++i) {
for (i = 0; i < s->num_cs * s->num_busses; ++i) {
sysbus_init_irq(dev, &s->cs_lines[i]);
}
memory_region_init_io(&s->iomem, &spips_ops, s, "spi", R_MAX*4);
sysbus_init_mmio(dev, &s->iomem);
memory_region_init_io(&s->mmlqspi, &lqspi_ops, s, "lqspi",
(1 << LQSPI_ADDRESS_BITS) * 2);
sysbus_init_mmio(dev, &s->mmlqspi);
s->irqline = -1;
s->lqspi_cached_addr = ~0ULL;
fifo8_create(&s->rx_fifo, RXFF_A);
fifo8_create(&s->tx_fifo, TXFF_A);
@ -317,18 +530,25 @@ static int xilinx_spips_post_load(void *opaque, int version_id)
static const VMStateDescription vmstate_xilinx_spips = {
.name = "xilinx_spips",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.version_id = 2,
.minimum_version_id = 2,
.minimum_version_id_old = 2,
.post_load = xilinx_spips_post_load,
.fields = (VMStateField[]) {
VMSTATE_FIFO8(tx_fifo, XilinxSPIPS),
VMSTATE_FIFO8(rx_fifo, XilinxSPIPS),
VMSTATE_UINT32_ARRAY(regs, XilinxSPIPS, R_MAX),
VMSTATE_UINT8(snoop_state, XilinxSPIPS),
VMSTATE_END_OF_LIST()
}
};
static Property xilinx_spips_properties[] = {
DEFINE_PROP_UINT8("num-busses", XilinxSPIPS, num_busses, 1),
DEFINE_PROP_UINT8("num-ss-bits", XilinxSPIPS, num_cs, 4),
DEFINE_PROP_UINT8("num-txrx-bytes", XilinxSPIPS, num_txrx_bytes, 1),
DEFINE_PROP_END_OF_LIST(),
};
static void xilinx_spips_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
@ -336,6 +556,7 @@ static void xilinx_spips_class_init(ObjectClass *klass, void *data)
sdc->init = xilinx_spips_init;
dc->reset = xilinx_spips_reset;
dc->props = xilinx_spips_properties;
dc->vmsd = &vmstate_xilinx_spips;
}