u-boot/drivers/spi/zynqmp_gqspi.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2018 Xilinx
*
* Xilinx ZynqMP Generic Quad-SPI(QSPI) controller driver(master mode only)
*/
#include <common.h>
#include <cpu_func.h>
#include <log.h>
#include <asm/arch/sys_proto.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <clk.h>
#include <dm.h>
#include <malloc.h>
#include <memalign.h>
#include <spi.h>
#include <spi-mem.h>
#include <ubi_uboot.h>
#include <wait_bit.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/sizes.h>
#include <zynqmp_firmware.h>
#define GQSPI_GFIFO_STRT_MODE_MASK BIT(29)
#define GQSPI_CONFIG_MODE_EN_MASK (3 << 30)
#define GQSPI_CONFIG_DMA_MODE (2 << 30)
#define GQSPI_CONFIG_CPHA_MASK BIT(2)
#define GQSPI_CONFIG_CPOL_MASK BIT(1)
/*
* QSPI Interrupt Registers bit Masks
*
* All the four interrupt registers (Status/Mask/Enable/Disable) have the same
* bit definitions.
*/
#define GQSPI_IXR_TXNFULL_MASK 0x00000004 /* QSPI TX FIFO Overflow */
#define GQSPI_IXR_TXFULL_MASK 0x00000008 /* QSPI TX FIFO is full */
#define GQSPI_IXR_TXFIFOEMPTY_MASK 0x00000100 /* QSPI TX FIFO is Empty */
#define GQSPI_IXR_RXNEMTY_MASK 0x00000010 /* QSPI RX FIFO Not Empty */
#define GQSPI_IXR_GFEMTY_MASK 0x00000080 /* QSPI Generic FIFO Empty */
#define GQSPI_IXR_GFNFULL_MASK 0x00000200 /* QSPI GENFIFO not full */
#define GQSPI_IXR_ALL_MASK (GQSPI_IXR_TXNFULL_MASK | \
GQSPI_IXR_RXNEMTY_MASK)
/*
* QSPI Enable Register bit Masks
*
* This register is used to enable or disable the QSPI controller
*/
#define GQSPI_ENABLE_ENABLE_MASK 0x00000001 /* QSPI Enable Bit Mask */
#define GQSPI_GFIFO_LOW_BUS BIT(14)
#define GQSPI_GFIFO_CS_LOWER BIT(12)
#define GQSPI_GFIFO_UP_BUS BIT(15)
#define GQSPI_GFIFO_CS_UPPER BIT(13)
#define GQSPI_SPI_MODE_QSPI (3 << 10)
#define GQSPI_SPI_MODE_SPI BIT(10)
#define GQSPI_SPI_MODE_DUAL_SPI (2 << 10)
#define GQSPI_IMD_DATA_CS_ASSERT 5
#define GQSPI_IMD_DATA_CS_DEASSERT 5
#define GQSPI_GFIFO_TX BIT(16)
#define GQSPI_GFIFO_RX BIT(17)
#define GQSPI_GFIFO_STRIPE_MASK BIT(18)
#define GQSPI_GFIFO_IMD_MASK 0xFF
#define GQSPI_GFIFO_EXP_MASK BIT(9)
#define GQSPI_GFIFO_DATA_XFR_MASK BIT(8)
#define GQSPI_STRT_GEN_FIFO BIT(28)
#define GQSPI_GEN_FIFO_STRT_MOD BIT(29)
#define GQSPI_GFIFO_WP_HOLD BIT(19)
#define GQSPI_BAUD_DIV_MASK (7 << 3)
#define GQSPI_DFLT_BAUD_RATE_DIV BIT(3)
#define GQSPI_GFIFO_ALL_INT_MASK 0xFBE
#define GQSPI_DMA_DST_I_STS_DONE BIT(1)
#define GQSPI_DMA_DST_I_STS_MASK 0xFE
#define MODEBITS 0x6
#define GQSPI_GFIFO_SELECT BIT(0)
#define GQSPI_FIFO_THRESHOLD 1
#define GQSPI_GENFIFO_THRESHOLD 31
#define SPI_XFER_ON_BOTH 0
#define SPI_XFER_ON_LOWER 1
#define SPI_XFER_ON_UPPER 2
#define GQSPI_DMA_ALIGN 0x4
#define GQSPI_MAX_BAUD_RATE_VAL 7
#define GQSPI_DFLT_BAUD_RATE_VAL 2
#define GQSPI_TIMEOUT 100000000
#define GQSPI_BAUD_DIV_SHIFT 2
#define GQSPI_LPBK_DLY_ADJ_LPBK_SHIFT 5
#define GQSPI_LPBK_DLY_ADJ_DLY_1 0x1
#define GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT 3
#define GQSPI_LPBK_DLY_ADJ_DLY_0 0x3
#define GQSPI_USE_DATA_DLY 0x1
#define GQSPI_USE_DATA_DLY_SHIFT 31
#define GQSPI_DATA_DLY_ADJ_VALUE 0x2
#define GQSPI_DATA_DLY_ADJ_SHIFT 28
#define TAP_DLY_BYPASS_LQSPI_RX_VALUE 0x1
#define TAP_DLY_BYPASS_LQSPI_RX_SHIFT 2
#define GQSPI_DATA_DLY_ADJ_OFST 0x000001F8
#define IOU_TAPDLY_BYPASS_OFST !(IS_ENABLED(CONFIG_ARCH_VERSAL) || \
IS_ENABLED(CONFIG_ARCH_VERSAL_NET)) ? \
0xFF180390 : 0xF103003C
#define GQSPI_LPBK_DLY_ADJ_LPBK_MASK 0x00000020
#define GQSPI_FREQ_37_5MHZ 37500000
#define GQSPI_FREQ_40MHZ 40000000
#define GQSPI_FREQ_100MHZ 100000000
#define GQSPI_FREQ_150MHZ 150000000
#define IOU_TAPDLY_BYPASS_MASK 0x7
#define GQSPI_REG_OFFSET 0x100
#define GQSPI_DMA_REG_OFFSET 0x800
/* QSPI register offsets */
struct zynqmp_qspi_regs {
u32 confr; /* 0x00 */
u32 isr; /* 0x04 */
u32 ier; /* 0x08 */
u32 idisr; /* 0x0C */
u32 imaskr; /* 0x10 */
u32 enbr; /* 0x14 */
u32 dr; /* 0x18 */
u32 txd0r; /* 0x1C */
u32 drxr; /* 0x20 */
u32 sicr; /* 0x24 */
u32 txftr; /* 0x28 */
u32 rxftr; /* 0x2C */
u32 gpior; /* 0x30 */
u32 reserved0; /* 0x34 */
u32 lpbkdly; /* 0x38 */
u32 reserved1; /* 0x3C */
u32 genfifo; /* 0x40 */
u32 gqspisel; /* 0x44 */
u32 reserved2; /* 0x48 */
u32 gqfifoctrl; /* 0x4C */
u32 gqfthr; /* 0x50 */
u32 gqpollcfg; /* 0x54 */
u32 gqpollto; /* 0x58 */
u32 gqxfersts; /* 0x5C */
u32 gqfifosnap; /* 0x60 */
u32 gqrxcpy; /* 0x64 */
u32 reserved3[36]; /* 0x68 */
u32 gqspidlyadj; /* 0xF8 */
};
struct zynqmp_qspi_dma_regs {
u32 dmadst; /* 0x00 */
u32 dmasize; /* 0x04 */
u32 dmasts; /* 0x08 */
u32 dmactrl; /* 0x0C */
u32 reserved0; /* 0x10 */
u32 dmaisr; /* 0x14 */
u32 dmaier; /* 0x18 */
u32 dmaidr; /* 0x1C */
u32 dmaimr; /* 0x20 */
u32 dmactrl2; /* 0x24 */
u32 dmadstmsb; /* 0x28 */
};
struct zynqmp_qspi_plat {
struct zynqmp_qspi_regs *regs;
struct zynqmp_qspi_dma_regs *dma_regs;
u32 frequency;
u32 speed_hz;
unsigned int io_mode;
};
struct zynqmp_qspi_priv {
struct zynqmp_qspi_regs *regs;
struct zynqmp_qspi_dma_regs *dma_regs;
const void *tx_buf;
void *rx_buf;
unsigned int len;
unsigned int io_mode;
int bytes_to_transfer;
int bytes_to_receive;
const struct spi_mem_op *op;
};
__weak int zynqmp_mmio_write(const u32 address, const u32 mask, const u32 value)
{
return 0;
}
static int zynqmp_qspi_of_to_plat(struct udevice *bus)
{
struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
debug("%s\n", __func__);
plat->regs = (struct zynqmp_qspi_regs *)(dev_read_addr(bus) +
GQSPI_REG_OFFSET);
plat->dma_regs = (struct zynqmp_qspi_dma_regs *)
(dev_read_addr(bus) + GQSPI_DMA_REG_OFFSET);
plat->io_mode = dev_read_bool(bus, "has-io-mode");
return 0;
}
static void zynqmp_qspi_init_hw(struct zynqmp_qspi_priv *priv)
{
u32 config_reg;
struct zynqmp_qspi_regs *regs = priv->regs;
writel(GQSPI_GFIFO_SELECT, &regs->gqspisel);
writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->idisr);
writel(GQSPI_FIFO_THRESHOLD, &regs->txftr);
writel(GQSPI_FIFO_THRESHOLD, &regs->rxftr);
writel(GQSPI_GENFIFO_THRESHOLD, &regs->gqfthr);
writel(GQSPI_GFIFO_ALL_INT_MASK, &regs->isr);
writel(~GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
config_reg = readl(&regs->confr);
config_reg &= ~(GQSPI_GFIFO_STRT_MODE_MASK |
GQSPI_CONFIG_MODE_EN_MASK);
config_reg |= GQSPI_GFIFO_WP_HOLD | GQSPI_DFLT_BAUD_RATE_DIV;
config_reg |= GQSPI_GFIFO_STRT_MODE_MASK;
if (!priv->io_mode)
config_reg |= GQSPI_CONFIG_DMA_MODE;
writel(config_reg, &regs->confr);
writel(GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
}
static u32 zynqmp_qspi_bus_select(struct zynqmp_qspi_priv *priv)
{
u32 gqspi_fifo_reg = 0;
gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS |
GQSPI_GFIFO_CS_LOWER;
return gqspi_fifo_reg;
}
static u32 zynqmp_qspi_genfifo_mode(u8 buswidth)
{
switch (buswidth) {
case 1:
return GQSPI_SPI_MODE_SPI;
case 2:
return GQSPI_SPI_MODE_DUAL_SPI;
case 4:
return GQSPI_SPI_MODE_QSPI;
default:
debug("Unsupported bus width %u\n", buswidth);
return GQSPI_SPI_MODE_SPI;
}
}
static void zynqmp_qspi_fill_gen_fifo(struct zynqmp_qspi_priv *priv,
u32 gqspi_fifo_reg)
{
struct zynqmp_qspi_regs *regs = priv->regs;
u32 config_reg, ier;
int ret = 0;
writel(gqspi_fifo_reg, &regs->genfifo);
config_reg = readl(&regs->confr);
/* Manual start if needed */
config_reg |= GQSPI_STRT_GEN_FIFO;
writel(config_reg, &regs->confr);
/* Enable interrupts */
ier = readl(&regs->ier);
ier |= GQSPI_IXR_GFEMTY_MASK;
writel(ier, &regs->ier);
/* Wait until the gen fifo is empty to write the new command */
ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_GFEMTY_MASK, 1,
GQSPI_TIMEOUT, 1);
if (ret)
printf("%s Timeout\n", __func__);
}
static void zynqmp_qspi_chipselect(struct zynqmp_qspi_priv *priv, int is_on)
{
u32 gqspi_fifo_reg = 0;
if (is_on) {
gqspi_fifo_reg = zynqmp_qspi_bus_select(priv);
gqspi_fifo_reg |= GQSPI_SPI_MODE_SPI |
GQSPI_IMD_DATA_CS_ASSERT;
} else {
gqspi_fifo_reg = GQSPI_GFIFO_LOW_BUS;
gqspi_fifo_reg |= GQSPI_IMD_DATA_CS_DEASSERT;
}
debug("GFIFO_CMD_CS: 0x%x\n", gqspi_fifo_reg);
zynqmp_qspi_fill_gen_fifo(priv, gqspi_fifo_reg);
}
static void zynqmp_qspi_set_tapdelay(struct udevice *bus, u32 baudrateval)
{
struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
struct zynqmp_qspi_regs *regs = priv->regs;
u32 tapdlybypass = 0, lpbkdlyadj = 0, datadlyadj = 0, clk_rate;
u32 reqhz = 0;
clk_rate = plat->frequency;
reqhz = (clk_rate / (GQSPI_BAUD_DIV_SHIFT << baudrateval));
debug("%s, req_hz:%d, clk_rate:%d, baudrateval:%d\n",
__func__, reqhz, clk_rate, baudrateval);
if (!(IS_ENABLED(CONFIG_ARCH_VERSAL) ||
IS_ENABLED(CONFIG_ARCH_VERSAL_NET))) {
if (reqhz <= GQSPI_FREQ_40MHZ) {
tapdlybypass = TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
TAP_DLY_BYPASS_LQSPI_RX_SHIFT;
} else if (reqhz <= GQSPI_FREQ_100MHZ) {
tapdlybypass = TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
TAP_DLY_BYPASS_LQSPI_RX_SHIFT;
lpbkdlyadj = GQSPI_LPBK_DLY_ADJ_LPBK_MASK;
datadlyadj = (GQSPI_USE_DATA_DLY <<
GQSPI_USE_DATA_DLY_SHIFT) |
(GQSPI_DATA_DLY_ADJ_VALUE <<
GQSPI_DATA_DLY_ADJ_SHIFT);
} else if (reqhz <= GQSPI_FREQ_150MHZ) {
lpbkdlyadj = GQSPI_LPBK_DLY_ADJ_LPBK_MASK |
GQSPI_LPBK_DLY_ADJ_DLY_0;
}
zynqmp_mmio_write(IOU_TAPDLY_BYPASS_OFST,
IOU_TAPDLY_BYPASS_MASK, tapdlybypass);
} else {
if (reqhz <= GQSPI_FREQ_37_5MHZ) {
tapdlybypass = TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
TAP_DLY_BYPASS_LQSPI_RX_SHIFT;
} else if (reqhz <= GQSPI_FREQ_100MHZ) {
tapdlybypass = TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
TAP_DLY_BYPASS_LQSPI_RX_SHIFT;
lpbkdlyadj = GQSPI_LPBK_DLY_ADJ_LPBK_MASK;
datadlyadj = GQSPI_USE_DATA_DLY <<
GQSPI_USE_DATA_DLY_SHIFT;
} else if (reqhz <= GQSPI_FREQ_150MHZ) {
lpbkdlyadj = GQSPI_LPBK_DLY_ADJ_LPBK_MASK |
(GQSPI_LPBK_DLY_ADJ_DLY_1 <<
GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT);
}
writel(tapdlybypass, IOU_TAPDLY_BYPASS_OFST);
}
writel(lpbkdlyadj, &regs->lpbkdly);
writel(datadlyadj, &regs->gqspidlyadj);
}
static int zynqmp_qspi_set_speed(struct udevice *bus, uint speed)
{
struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
struct zynqmp_qspi_regs *regs = priv->regs;
u32 confr;
u8 baud_rate_val = 0;
debug("%s\n", __func__);
if (speed > plat->frequency)
speed = plat->frequency;
if (plat->speed_hz != speed) {
/* Set the clock frequency */
/* If speed == 0, default to lowest speed */
while ((baud_rate_val < 8) &&
((plat->frequency /
(2 << baud_rate_val)) > speed))
baud_rate_val++;
if (baud_rate_val > GQSPI_MAX_BAUD_RATE_VAL)
baud_rate_val = GQSPI_DFLT_BAUD_RATE_VAL;
plat->speed_hz = plat->frequency / (2 << baud_rate_val);
confr = readl(&regs->confr);
confr &= ~GQSPI_BAUD_DIV_MASK;
confr |= (baud_rate_val << 3);
writel(confr, &regs->confr);
zynqmp_qspi_set_tapdelay(bus, baud_rate_val);
debug("regs=%p, speed=%d\n", priv->regs, plat->speed_hz);
}
return 0;
}
static int zynqmp_qspi_probe(struct udevice *bus)
{
struct zynqmp_qspi_plat *plat = dev_get_plat(bus);
struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
struct clk clk;
unsigned long clock;
int ret;
debug("%s: bus:%p, priv:%p\n", __func__, bus, priv);
priv->regs = plat->regs;
priv->dma_regs = plat->dma_regs;
priv->io_mode = plat->io_mode;
ret = clk_get_by_index(bus, 0, &clk);
if (ret < 0) {
dev_err(bus, "failed to get clock\n");
return ret;
}
clock = clk_get_rate(&clk);
if (IS_ERR_VALUE(clock)) {
dev_err(bus, "failed to get rate\n");
return clock;
}
debug("%s: CLK %ld\n", __func__, clock);
ret = clk_enable(&clk);
if (ret) {
dev_err(bus, "failed to enable clock\n");
return ret;
}
plat->frequency = clock;
plat->speed_hz = plat->frequency / 2;
/* init the zynq spi hw */
zynqmp_qspi_init_hw(priv);
return 0;
}
static int zynqmp_qspi_set_mode(struct udevice *bus, uint mode)
{
struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
struct zynqmp_qspi_regs *regs = priv->regs;
u32 confr;
debug("%s\n", __func__);
/* Set the SPI Clock phase and polarities */
confr = readl(&regs->confr);
confr &= ~(GQSPI_CONFIG_CPHA_MASK | GQSPI_CONFIG_CPOL_MASK);
if (mode & SPI_CPHA)
confr |= GQSPI_CONFIG_CPHA_MASK;
if (mode & SPI_CPOL)
confr |= GQSPI_CONFIG_CPOL_MASK;
writel(confr, &regs->confr);
return 0;
}
static int zynqmp_qspi_fill_tx_fifo(struct zynqmp_qspi_priv *priv, u32 size)
{
u32 data;
int ret = 0;
struct zynqmp_qspi_regs *regs = priv->regs;
u32 *buf = (u32 *)priv->tx_buf;
u32 len = size;
debug("TxFIFO: 0x%x, size: 0x%x\n", readl(&regs->isr),
size);
while (size) {
ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_TXNFULL_MASK, 1,
GQSPI_TIMEOUT, 1);
if (ret) {
printf("%s: Timeout\n", __func__);
return ret;
}
if (size >= 4) {
writel(*buf, &regs->txd0r);
buf++;
size -= 4;
} else {
switch (size) {
case 1:
data = *((u8 *)buf);
buf += 1;
data |= GENMASK(31, 8);
break;
case 2:
data = *((u16 *)buf);
buf += 2;
data |= GENMASK(31, 16);
break;
case 3:
data = *buf;
buf += 3;
data |= GENMASK(31, 24);
break;
}
writel(data, &regs->txd0r);
size = 0;
}
}
ret = wait_for_bit_le32(&regs->isr, GQSPI_IXR_TXFIFOEMPTY_MASK, 1,
GQSPI_TIMEOUT, 1);
if (ret) {
printf("%s: Timeout\n", __func__);
return ret;
}
priv->tx_buf += len;
return 0;
}
static void zynqmp_qspi_genfifo_cmd(struct zynqmp_qspi_priv *priv)
{
const struct spi_mem_op *op = priv->op;
u32 gen_fifo_cmd;
u8 i, dummy_cycles, addr;
/* Send opcode */
gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(op->cmd.buswidth);
gen_fifo_cmd |= GQSPI_GFIFO_TX;
gen_fifo_cmd |= op->cmd.opcode;
zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
/* Send address */
for (i = 0; i < op->addr.nbytes; i++) {
addr = op->addr.val >> (8 * (op->addr.nbytes - i - 1));
gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(op->addr.buswidth);
gen_fifo_cmd |= GQSPI_GFIFO_TX;
gen_fifo_cmd |= addr;
debug("GFIFO_CMD_Cmd = 0x%x\n", gen_fifo_cmd);
zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
}
/* Send dummy */
if (op->dummy.nbytes) {
dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth;
gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(op->dummy.buswidth);
gen_fifo_cmd &= ~(GQSPI_GFIFO_TX | GQSPI_GFIFO_RX);
gen_fifo_cmd |= GQSPI_GFIFO_DATA_XFR_MASK;
gen_fifo_cmd |= dummy_cycles;
zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
}
}
static u32 zynqmp_qspi_calc_exp(struct zynqmp_qspi_priv *priv,
u32 *gen_fifo_cmd)
{
u32 expval = 8;
u32 len;
while (1) {
if (priv->len > 255) {
if (priv->len & (1 << expval)) {
*gen_fifo_cmd &= ~GQSPI_GFIFO_IMD_MASK;
*gen_fifo_cmd |= GQSPI_GFIFO_EXP_MASK;
*gen_fifo_cmd |= expval;
priv->len -= (1 << expval);
return expval;
}
expval++;
} else {
*gen_fifo_cmd &= ~(GQSPI_GFIFO_IMD_MASK |
GQSPI_GFIFO_EXP_MASK);
*gen_fifo_cmd |= (u8)priv->len;
len = (u8)priv->len;
priv->len = 0;
return len;
}
}
}
static int zynqmp_qspi_genfifo_fill_tx(struct zynqmp_qspi_priv *priv)
{
u32 gen_fifo_cmd;
u32 len;
int ret = 0;
gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(priv->op->data.buswidth);
gen_fifo_cmd |= GQSPI_GFIFO_TX | GQSPI_GFIFO_DATA_XFR_MASK;
while (priv->len) {
len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
debug("GFIFO_CMD_TX:0x%x\n", gen_fifo_cmd);
if (gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK)
ret = zynqmp_qspi_fill_tx_fifo(priv, 1 << len);
else
ret = zynqmp_qspi_fill_tx_fifo(priv, len);
if (ret)
return ret;
}
return ret;
}
static int zynqmp_qspi_start_io(struct zynqmp_qspi_priv *priv,
u32 gen_fifo_cmd, u32 *buf)
{
u32 len;
u32 actuallen = priv->len;
u32 config_reg, ier, isr;
u32 timeout = GQSPI_TIMEOUT;
struct zynqmp_qspi_regs *regs = priv->regs;
u32 last_bits;
u32 *traverse = buf;
while (priv->len) {
len = zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
/* If exponent bit is set, reset immediate to be 2^len */
if (gen_fifo_cmd & GQSPI_GFIFO_EXP_MASK)
priv->bytes_to_receive = (1 << len);
else
priv->bytes_to_receive = len;
zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
/* Manual start */
config_reg = readl(&regs->confr);
config_reg |= GQSPI_STRT_GEN_FIFO;
writel(config_reg, &regs->confr);
/* Enable RX interrupts for IO mode */
ier = readl(&regs->ier);
ier |= GQSPI_IXR_ALL_MASK;
writel(ier, &regs->ier);
while (priv->bytes_to_receive && timeout) {
isr = readl(&regs->isr);
if (isr & GQSPI_IXR_RXNEMTY_MASK) {
if (priv->bytes_to_receive >= 4) {
*traverse = readl(&regs->drxr);
traverse++;
priv->bytes_to_receive -= 4;
} else {
last_bits = readl(&regs->drxr);
memcpy(traverse, &last_bits,
priv->bytes_to_receive);
priv->bytes_to_receive = 0;
}
timeout = GQSPI_TIMEOUT;
} else {
udelay(1);
timeout--;
}
}
debug("buf:0x%lx, rxbuf:0x%lx, *buf:0x%x len: 0x%x\n",
(unsigned long)buf, (unsigned long)priv->rx_buf,
*buf, actuallen);
if (!timeout) {
printf("IO timeout: %d\n", readl(&regs->isr));
return -1;
}
}
return 0;
}
static int zynqmp_qspi_start_dma(struct zynqmp_qspi_priv *priv,
u32 gen_fifo_cmd, u32 *buf)
{
unsigned long addr;
u32 size;
u32 actuallen = priv->len;
u32 totallen = priv->len;
int ret = 0;
struct zynqmp_qspi_dma_regs *dma_regs = priv->dma_regs;
while (totallen) {
if (totallen >= SZ_512M)
priv->len = SZ_256M;
else
priv->len = totallen;
totallen -= priv->len; /* Save remaining bytes length to read */
actuallen = priv->len; /* Actual number of bytes reading */
writel(lower_32_bits((unsigned long)buf), &dma_regs->dmadst);
writel(upper_32_bits((unsigned long)buf) & GENMASK(11, 0),
&dma_regs->dmadstmsb);
writel(roundup(priv->len, GQSPI_DMA_ALIGN), &dma_regs->dmasize);
writel(GQSPI_DMA_DST_I_STS_MASK, &dma_regs->dmaier);
addr = (unsigned long)buf;
size = roundup(priv->len, GQSPI_DMA_ALIGN);
invalidate_dcache_range(addr, addr + size);
while (priv->len) {
zynqmp_qspi_calc_exp(priv, &gen_fifo_cmd);
zynqmp_qspi_fill_gen_fifo(priv, gen_fifo_cmd);
debug("GFIFO_CMD_RX:0x%x\n", gen_fifo_cmd);
}
ret = wait_for_bit_le32(&dma_regs->dmaisr,
GQSPI_DMA_DST_I_STS_DONE, 1,
GQSPI_TIMEOUT, 1);
if (ret) {
printf("DMA Timeout:0x%x\n", readl(&dma_regs->dmaisr));
return -ETIMEDOUT;
}
writel(GQSPI_DMA_DST_I_STS_DONE, &dma_regs->dmaisr);
debug("buf:0x%lx, rxbuf:0x%lx, *buf:0x%x len: 0x%x\n",
(unsigned long)buf, (unsigned long)priv->rx_buf, *buf,
actuallen);
if (buf != priv->rx_buf)
memcpy(priv->rx_buf, buf, actuallen);
buf = (u32 *)((u8 *)buf + actuallen);
priv->rx_buf = (u8 *)priv->rx_buf + actuallen;
}
return 0;
}
static int zynqmp_qspi_genfifo_fill_rx(struct zynqmp_qspi_priv *priv)
{
u32 gen_fifo_cmd;
u32 *buf;
u32 actuallen = priv->len;
gen_fifo_cmd = zynqmp_qspi_bus_select(priv);
gen_fifo_cmd |= zynqmp_qspi_genfifo_mode(priv->op->data.buswidth);
gen_fifo_cmd |= GQSPI_GFIFO_RX | GQSPI_GFIFO_DATA_XFR_MASK;
/*
* Check if receive buffer is aligned to 4 byte and length
* is multiples of four byte as we are using dma to receive.
*/
if ((!((unsigned long)priv->rx_buf & (GQSPI_DMA_ALIGN - 1)) &&
!(actuallen % GQSPI_DMA_ALIGN)) || priv->io_mode) {
buf = (u32 *)priv->rx_buf;
if (priv->io_mode)
return zynqmp_qspi_start_io(priv, gen_fifo_cmd, buf);
else
return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
}
ALLOC_CACHE_ALIGN_BUFFER(u8, tmp, roundup(priv->len, GQSPI_DMA_ALIGN));
buf = (u32 *)tmp;
return zynqmp_qspi_start_dma(priv, gen_fifo_cmd, buf);
}
static int zynqmp_qspi_claim_bus(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
struct zynqmp_qspi_regs *regs = priv->regs;
writel(GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
return 0;
}
static int zynqmp_qspi_release_bus(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct zynqmp_qspi_priv *priv = dev_get_priv(bus);
struct zynqmp_qspi_regs *regs = priv->regs;
writel(~GQSPI_ENABLE_ENABLE_MASK, &regs->enbr);
return 0;
}
static int zynqmp_qspi_exec_op(struct spi_slave *slave,
const struct spi_mem_op *op)
{
struct zynqmp_qspi_priv *priv = dev_get_priv(slave->dev->parent);
int ret = 0;
priv->op = op;
priv->tx_buf = op->data.buf.out;
priv->rx_buf = op->data.buf.in;
priv->len = op->data.nbytes;
zynqmp_qspi_chipselect(priv, 1);
/* Send opcode, addr, dummy */
zynqmp_qspi_genfifo_cmd(priv);
/* Request the transfer */
if (op->data.dir == SPI_MEM_DATA_IN)
ret = zynqmp_qspi_genfifo_fill_rx(priv);
else if (op->data.dir == SPI_MEM_DATA_OUT)
ret = zynqmp_qspi_genfifo_fill_tx(priv);
zynqmp_qspi_chipselect(priv, 0);
return ret;
}
static const struct spi_controller_mem_ops zynqmp_qspi_mem_ops = {
.exec_op = zynqmp_qspi_exec_op,
};
static const struct dm_spi_ops zynqmp_qspi_ops = {
.claim_bus = zynqmp_qspi_claim_bus,
.release_bus = zynqmp_qspi_release_bus,
.set_speed = zynqmp_qspi_set_speed,
.set_mode = zynqmp_qspi_set_mode,
.mem_ops = &zynqmp_qspi_mem_ops,
};
static const struct udevice_id zynqmp_qspi_ids[] = {
{ .compatible = "xlnx,zynqmp-qspi-1.0" },
{ .compatible = "xlnx,versal-qspi-1.0" },
{ }
};
U_BOOT_DRIVER(zynqmp_qspi) = {
.name = "zynqmp_qspi",
.id = UCLASS_SPI,
.of_match = zynqmp_qspi_ids,
.ops = &zynqmp_qspi_ops,
.of_to_plat = zynqmp_qspi_of_to_plat,
.plat_auto = sizeof(struct zynqmp_qspi_plat),
.priv_auto = sizeof(struct zynqmp_qspi_priv),
.probe = zynqmp_qspi_probe,
};