u-boot/drivers/spi/zynq_qspi.c
Nathan Rossi 04a44d3671 spi: zynq_qspi: Add configuration to disable LQSPI feature
When the Zynq Boot ROM code loads the payload from QSPI it uses the
LQSPI feature of the QSPI device, however it does not clean up its
configuration before handing over to the payload which leaves the device
confgured to by-pass the standard non-linear operating mode.

This ensures the Linear QSPI mode is disabled before re-enabling the
device.

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Cc: Jagan Teki <jteki@openedev.com>
Cc: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2015-12-18 13:15:57 +01:00

630 lines
16 KiB
C

/*
* (C) Copyright 2013 Xilinx, Inc.
* (C) Copyright 2015 Jagan Teki <jteki@openedev.com>
*
* Xilinx Zynq Quad-SPI(QSPI) controller driver (master mode only)
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <spi.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
/* zynq qspi register bit masks ZYNQ_QSPI_<REG>_<BIT>_MASK */
#define ZYNQ_QSPI_CR_IFMODE_MASK BIT(31) /* Flash intrface mode*/
#define ZYNQ_QSPI_CR_MSA_MASK BIT(15) /* Manual start enb */
#define ZYNQ_QSPI_CR_MCS_MASK BIT(14) /* Manual chip select */
#define ZYNQ_QSPI_CR_PCS_MASK BIT(10) /* Peri chip select */
#define ZYNQ_QSPI_CR_FW_MASK GENMASK(7, 6) /* FIFO width */
#define ZYNQ_QSPI_CR_SS_MASK GENMASK(13, 10) /* Slave Select */
#define ZYNQ_QSPI_CR_BAUD_MASK GENMASK(5, 3) /* Baud rate div */
#define ZYNQ_QSPI_CR_CPHA_MASK BIT(2) /* Clock phase */
#define ZYNQ_QSPI_CR_CPOL_MASK BIT(1) /* Clock polarity */
#define ZYNQ_QSPI_CR_MSTREN_MASK BIT(0) /* Mode select */
#define ZYNQ_QSPI_IXR_RXNEMPTY_MASK BIT(4) /* RX_FIFO_not_empty */
#define ZYNQ_QSPI_IXR_TXOW_MASK BIT(2) /* TX_FIFO_not_full */
#define ZYNQ_QSPI_IXR_ALL_MASK GENMASK(6, 0) /* All IXR bits */
#define ZYNQ_QSPI_ENR_SPI_EN_MASK BIT(0) /* SPI Enable */
#define ZYNQ_QSPI_LQSPICFG_LQMODE_MASK BIT(31) /* Linear QSPI Mode */
/* zynq qspi Transmit Data Register */
#define ZYNQ_QSPI_TXD_00_00_OFFSET 0x1C /* Transmit 4-byte inst */
#define ZYNQ_QSPI_TXD_00_01_OFFSET 0x80 /* Transmit 1-byte inst */
#define ZYNQ_QSPI_TXD_00_10_OFFSET 0x84 /* Transmit 2-byte inst */
#define ZYNQ_QSPI_TXD_00_11_OFFSET 0x88 /* Transmit 3-byte inst */
#define ZYNQ_QSPI_TXFIFO_THRESHOLD 1 /* Tx FIFO threshold level*/
#define ZYNQ_QSPI_RXFIFO_THRESHOLD 32 /* Rx FIFO threshold level */
#define ZYNQ_QSPI_CR_BAUD_MAX 8 /* Baud rate divisor max val */
#define ZYNQ_QSPI_CR_BAUD_SHIFT 3 /* Baud rate divisor shift */
#define ZYNQ_QSPI_CR_SS_SHIFT 10 /* Slave select shift */
#define ZYNQ_QSPI_FIFO_DEPTH 63
#ifndef CONFIG_SYS_ZYNQ_QSPI_WAIT
#define CONFIG_SYS_ZYNQ_QSPI_WAIT CONFIG_SYS_HZ/100 /* 10 ms */
#endif
/* zynq qspi register set */
struct zynq_qspi_regs {
u32 cr; /* 0x00 */
u32 isr; /* 0x04 */
u32 ier; /* 0x08 */
u32 idr; /* 0x0C */
u32 imr; /* 0x10 */
u32 enr; /* 0x14 */
u32 dr; /* 0x18 */
u32 txd0r; /* 0x1C */
u32 drxr; /* 0x20 */
u32 sicr; /* 0x24 */
u32 txftr; /* 0x28 */
u32 rxftr; /* 0x2C */
u32 gpior; /* 0x30 */
u32 reserved0[19];
u32 txd1r; /* 0x80 */
u32 txd2r; /* 0x84 */
u32 txd3r; /* 0x88 */
u32 reserved1[5];
u32 lqspicfg; /* 0xA0 */
u32 lqspists; /* 0xA4 */
};
/* zynq qspi platform data */
struct zynq_qspi_platdata {
struct zynq_qspi_regs *regs;
u32 frequency; /* input frequency */
u32 speed_hz;
};
/* zynq qspi priv */
struct zynq_qspi_priv {
struct zynq_qspi_regs *regs;
u8 cs;
u8 mode;
u8 fifo_depth;
u32 freq; /* required frequency */
const void *tx_buf;
void *rx_buf;
unsigned len;
int bytes_to_transfer;
int bytes_to_receive;
unsigned int is_inst;
unsigned cs_change:1;
};
static int zynq_qspi_ofdata_to_platdata(struct udevice *bus)
{
struct zynq_qspi_platdata *plat = bus->platdata;
const void *blob = gd->fdt_blob;
int node = bus->of_offset;
plat->regs = (struct zynq_qspi_regs *)fdtdec_get_addr(blob,
node, "reg");
/* FIXME: Use 166MHz as a suitable default */
plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
166666666);
plat->speed_hz = plat->frequency / 2;
debug("%s: regs=%p max-frequency=%d\n", __func__,
plat->regs, plat->frequency);
return 0;
}
static void zynq_qspi_init_hw(struct zynq_qspi_priv *priv)
{
struct zynq_qspi_regs *regs = priv->regs;
u32 confr;
/* Disable QSPI */
writel(~ZYNQ_QSPI_ENR_SPI_EN_MASK, &regs->enr);
/* Disable Interrupts */
writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->idr);
/* Clear the TX and RX threshold reg */
writel(ZYNQ_QSPI_TXFIFO_THRESHOLD, &regs->txftr);
writel(ZYNQ_QSPI_RXFIFO_THRESHOLD, &regs->rxftr);
/* Clear the RX FIFO */
while (readl(&regs->isr) & ZYNQ_QSPI_IXR_RXNEMPTY_MASK)
readl(&regs->drxr);
/* Clear Interrupts */
writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->isr);
/* Manual slave select and Auto start */
confr = readl(&regs->cr);
confr &= ~ZYNQ_QSPI_CR_MSA_MASK;
confr |= ZYNQ_QSPI_CR_IFMODE_MASK | ZYNQ_QSPI_CR_MCS_MASK |
ZYNQ_QSPI_CR_PCS_MASK | ZYNQ_QSPI_CR_FW_MASK |
ZYNQ_QSPI_CR_MSTREN_MASK;
writel(confr, &regs->cr);
/* Disable the LQSPI feature */
confr = readl(&regs->lqspicfg);
confr &= ~ZYNQ_QSPI_LQSPICFG_LQMODE_MASK;
writel(confr, &regs->lqspicfg);
/* Enable SPI */
writel(ZYNQ_QSPI_ENR_SPI_EN_MASK, &regs->enr);
}
static int zynq_qspi_probe(struct udevice *bus)
{
struct zynq_qspi_platdata *plat = dev_get_platdata(bus);
struct zynq_qspi_priv *priv = dev_get_priv(bus);
priv->regs = plat->regs;
priv->fifo_depth = ZYNQ_QSPI_FIFO_DEPTH;
/* init the zynq spi hw */
zynq_qspi_init_hw(priv);
return 0;
}
/*
* zynq_qspi_read_data - Copy data to RX buffer
* @zqspi: Pointer to the zynq_qspi structure
* @data: The 32 bit variable where data is stored
* @size: Number of bytes to be copied from data to RX buffer
*/
static void zynq_qspi_read_data(struct zynq_qspi_priv *priv, u32 data, u8 size)
{
u8 byte3;
debug("%s: data 0x%04x rx_buf addr: 0x%08x size %d\n", __func__ ,
data, (unsigned)(priv->rx_buf), size);
if (priv->rx_buf) {
switch (size) {
case 1:
*((u8 *)priv->rx_buf) = data;
priv->rx_buf += 1;
break;
case 2:
*((u16 *)priv->rx_buf) = data;
priv->rx_buf += 2;
break;
case 3:
*((u16 *)priv->rx_buf) = data;
priv->rx_buf += 2;
byte3 = (u8)(data >> 16);
*((u8 *)priv->rx_buf) = byte3;
priv->rx_buf += 1;
break;
case 4:
/* Can not assume word aligned buffer */
memcpy(priv->rx_buf, &data, size);
priv->rx_buf += 4;
break;
default:
/* This will never execute */
break;
}
}
priv->bytes_to_receive -= size;
if (priv->bytes_to_receive < 0)
priv->bytes_to_receive = 0;
}
/*
* zynq_qspi_write_data - Copy data from TX buffer
* @zqspi: Pointer to the zynq_qspi structure
* @data: Pointer to the 32 bit variable where data is to be copied
* @size: Number of bytes to be copied from TX buffer to data
*/
static void zynq_qspi_write_data(struct zynq_qspi_priv *priv,
u32 *data, u8 size)
{
if (priv->tx_buf) {
switch (size) {
case 1:
*data = *((u8 *)priv->tx_buf);
priv->tx_buf += 1;
*data |= 0xFFFFFF00;
break;
case 2:
*data = *((u16 *)priv->tx_buf);
priv->tx_buf += 2;
*data |= 0xFFFF0000;
break;
case 3:
*data = *((u16 *)priv->tx_buf);
priv->tx_buf += 2;
*data |= (*((u8 *)priv->tx_buf) << 16);
priv->tx_buf += 1;
*data |= 0xFF000000;
break;
case 4:
/* Can not assume word aligned buffer */
memcpy(data, priv->tx_buf, size);
priv->tx_buf += 4;
break;
default:
/* This will never execute */
break;
}
} else {
*data = 0;
}
debug("%s: data 0x%08x tx_buf addr: 0x%08x size %d\n", __func__,
*data, (u32)priv->tx_buf, size);
priv->bytes_to_transfer -= size;
if (priv->bytes_to_transfer < 0)
priv->bytes_to_transfer = 0;
}
static void zynq_qspi_chipselect(struct zynq_qspi_priv *priv, int is_on)
{
u32 confr;
struct zynq_qspi_regs *regs = priv->regs;
confr = readl(&regs->cr);
if (is_on) {
/* Select the slave */
confr &= ~ZYNQ_QSPI_CR_SS_MASK;
confr |= (~(1 << priv->cs) << ZYNQ_QSPI_CR_SS_SHIFT) &
ZYNQ_QSPI_CR_SS_MASK;
} else
/* Deselect the slave */
confr |= ZYNQ_QSPI_CR_SS_MASK;
writel(confr, &regs->cr);
}
/*
* zynq_qspi_fill_tx_fifo - Fills the TX FIFO with as many bytes as possible
* @zqspi: Pointer to the zynq_qspi structure
*/
static void zynq_qspi_fill_tx_fifo(struct zynq_qspi_priv *priv, u32 size)
{
u32 data = 0;
u32 fifocount = 0;
unsigned len, offset;
struct zynq_qspi_regs *regs = priv->regs;
static const unsigned offsets[4] = {
ZYNQ_QSPI_TXD_00_00_OFFSET, ZYNQ_QSPI_TXD_00_01_OFFSET,
ZYNQ_QSPI_TXD_00_10_OFFSET, ZYNQ_QSPI_TXD_00_11_OFFSET };
while ((fifocount < size) &&
(priv->bytes_to_transfer > 0)) {
if (priv->bytes_to_transfer >= 4) {
if (priv->tx_buf) {
memcpy(&data, priv->tx_buf, 4);
priv->tx_buf += 4;
} else {
data = 0;
}
writel(data, &regs->txd0r);
priv->bytes_to_transfer -= 4;
fifocount++;
} else {
/* Write TXD1, TXD2, TXD3 only if TxFIFO is empty. */
if (!(readl(&regs->isr)
& ZYNQ_QSPI_IXR_TXOW_MASK) &&
!priv->rx_buf)
return;
len = priv->bytes_to_transfer;
zynq_qspi_write_data(priv, &data, len);
offset = (priv->rx_buf) ? offsets[0] : offsets[len];
writel(data, &regs->cr + (offset / 4));
}
}
}
/*
* zynq_qspi_irq_poll - Interrupt service routine of the QSPI controller
* @zqspi: Pointer to the zynq_qspi structure
*
* This function handles TX empty and Mode Fault interrupts only.
* On TX empty interrupt this function reads the received data from RX FIFO and
* fills the TX FIFO if there is any data remaining to be transferred.
* On Mode Fault interrupt this function indicates that transfer is completed,
* the SPI subsystem will identify the error as the remaining bytes to be
* transferred is non-zero.
*
* returns: 0 for poll timeout
* 1 transfer operation complete
*/
static int zynq_qspi_irq_poll(struct zynq_qspi_priv *priv)
{
struct zynq_qspi_regs *regs = priv->regs;
u32 rxindex = 0;
u32 rxcount;
u32 status, timeout;
/* Poll until any of the interrupt status bits are set */
timeout = get_timer(0);
do {
status = readl(&regs->isr);
} while ((status == 0) &&
(get_timer(timeout) < CONFIG_SYS_ZYNQ_QSPI_WAIT));
if (status == 0) {
printf("zynq_qspi_irq_poll: Timeout!\n");
return -ETIMEDOUT;
}
writel(status, &regs->isr);
/* Disable all interrupts */
writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->idr);
if ((status & ZYNQ_QSPI_IXR_TXOW_MASK) ||
(status & ZYNQ_QSPI_IXR_RXNEMPTY_MASK)) {
/*
* This bit is set when Tx FIFO has < THRESHOLD entries. We have
* the THRESHOLD value set to 1, so this bit indicates Tx FIFO
* is empty
*/
rxcount = priv->bytes_to_receive - priv->bytes_to_transfer;
rxcount = (rxcount % 4) ? ((rxcount/4)+1) : (rxcount/4);
while ((rxindex < rxcount) &&
(rxindex < ZYNQ_QSPI_RXFIFO_THRESHOLD)) {
/* Read out the data from the RX FIFO */
u32 data;
data = readl(&regs->drxr);
if (priv->bytes_to_receive >= 4) {
if (priv->rx_buf) {
memcpy(priv->rx_buf, &data, 4);
priv->rx_buf += 4;
}
priv->bytes_to_receive -= 4;
} else {
zynq_qspi_read_data(priv, data,
priv->bytes_to_receive);
}
rxindex++;
}
if (priv->bytes_to_transfer) {
/* There is more data to send */
zynq_qspi_fill_tx_fifo(priv,
ZYNQ_QSPI_RXFIFO_THRESHOLD);
writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->ier);
} else {
/*
* If transfer and receive is completed then only send
* complete signal
*/
if (!priv->bytes_to_receive) {
/* return operation complete */
writel(ZYNQ_QSPI_IXR_ALL_MASK,
&regs->idr);
return 1;
}
}
}
return 0;
}
/*
* zynq_qspi_start_transfer - Initiates the QSPI transfer
* @qspi: Pointer to the spi_device structure
* @transfer: Pointer to the spi_transfer structure which provide information
* about next transfer parameters
*
* This function fills the TX FIFO, starts the QSPI transfer, and waits for the
* transfer to be completed.
*
* returns: Number of bytes transferred in the last transfer
*/
static int zynq_qspi_start_transfer(struct zynq_qspi_priv *priv)
{
u32 data = 0;
struct zynq_qspi_regs *regs = priv->regs;
debug("%s: qspi: 0x%08x transfer: 0x%08x len: %d\n", __func__,
(u32)priv, (u32)priv, priv->len);
priv->bytes_to_transfer = priv->len;
priv->bytes_to_receive = priv->len;
if (priv->len < 4)
zynq_qspi_fill_tx_fifo(priv, priv->len);
else
zynq_qspi_fill_tx_fifo(priv, priv->fifo_depth);
writel(ZYNQ_QSPI_IXR_ALL_MASK, &regs->ier);
/* wait for completion */
do {
data = zynq_qspi_irq_poll(priv);
} while (data == 0);
return (priv->len) - (priv->bytes_to_transfer);
}
static int zynq_qspi_transfer(struct zynq_qspi_priv *priv)
{
unsigned cs_change = 1;
int status = 0;
while (1) {
/* Select the chip if required */
if (cs_change)
zynq_qspi_chipselect(priv, 1);
cs_change = priv->cs_change;
if (!priv->tx_buf && !priv->rx_buf && priv->len) {
status = -1;
break;
}
/* Request the transfer */
if (priv->len) {
status = zynq_qspi_start_transfer(priv);
priv->is_inst = 0;
}
if (status != priv->len) {
if (status > 0)
status = -EMSGSIZE;
debug("zynq_qspi_transfer:%d len:%d\n",
status, priv->len);
break;
}
status = 0;
if (cs_change)
/* Deselect the chip */
zynq_qspi_chipselect(priv, 0);
break;
}
return 0;
}
static int zynq_qspi_claim_bus(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct zynq_qspi_priv *priv = dev_get_priv(bus);
struct zynq_qspi_regs *regs = priv->regs;
writel(ZYNQ_QSPI_ENR_SPI_EN_MASK, &regs->enr);
return 0;
}
static int zynq_qspi_release_bus(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct zynq_qspi_priv *priv = dev_get_priv(bus);
struct zynq_qspi_regs *regs = priv->regs;
writel(~ZYNQ_QSPI_ENR_SPI_EN_MASK, &regs->enr);
return 0;
}
static int zynq_qspi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct udevice *bus = dev->parent;
struct zynq_qspi_priv *priv = dev_get_priv(bus);
struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
priv->cs = slave_plat->cs;
priv->tx_buf = dout;
priv->rx_buf = din;
priv->len = bitlen / 8;
debug("zynq_qspi_xfer: bus:%i cs:%i bitlen:%i len:%i flags:%lx\n",
bus->seq, slave_plat->cs, bitlen, priv->len, flags);
/*
* Festering sore.
* Assume that the beginning of a transfer with bits to
* transmit must contain a device command.
*/
if (dout && flags & SPI_XFER_BEGIN)
priv->is_inst = 1;
else
priv->is_inst = 0;
if (flags & SPI_XFER_END)
priv->cs_change = 1;
else
priv->cs_change = 0;
zynq_qspi_transfer(priv);
return 0;
}
static int zynq_qspi_set_speed(struct udevice *bus, uint speed)
{
struct zynq_qspi_platdata *plat = bus->platdata;
struct zynq_qspi_priv *priv = dev_get_priv(bus);
struct zynq_qspi_regs *regs = priv->regs;
uint32_t confr;
u8 baud_rate_val = 0;
if (speed > plat->frequency)
speed = plat->frequency;
/* Set the clock frequency */
confr = readl(&regs->cr);
if (speed == 0) {
/* Set baudrate x8, if the freq is 0 */
baud_rate_val = 0x2;
} else if (plat->speed_hz != speed) {
while ((baud_rate_val < ZYNQ_QSPI_CR_BAUD_MAX) &&
((plat->frequency /
(2 << baud_rate_val)) > speed))
baud_rate_val++;
plat->speed_hz = speed / (2 << baud_rate_val);
}
confr &= ~ZYNQ_QSPI_CR_BAUD_MASK;
confr |= (baud_rate_val << ZYNQ_QSPI_CR_BAUD_SHIFT);
writel(confr, &regs->cr);
priv->freq = speed;
debug("%s: regs=%p, speed=%d\n", __func__, priv->regs, priv->freq);
return 0;
}
static int zynq_qspi_set_mode(struct udevice *bus, uint mode)
{
struct zynq_qspi_priv *priv = dev_get_priv(bus);
struct zynq_qspi_regs *regs = priv->regs;
uint32_t confr;
/* Set the SPI Clock phase and polarities */
confr = readl(&regs->cr);
confr &= ~(ZYNQ_QSPI_CR_CPHA_MASK | ZYNQ_QSPI_CR_CPOL_MASK);
if (mode & SPI_CPHA)
confr |= ZYNQ_QSPI_CR_CPHA_MASK;
if (mode & SPI_CPOL)
confr |= ZYNQ_QSPI_CR_CPOL_MASK;
writel(confr, &regs->cr);
priv->mode = mode;
debug("%s: regs=%p, mode=%d\n", __func__, priv->regs, priv->mode);
return 0;
}
static const struct dm_spi_ops zynq_qspi_ops = {
.claim_bus = zynq_qspi_claim_bus,
.release_bus = zynq_qspi_release_bus,
.xfer = zynq_qspi_xfer,
.set_speed = zynq_qspi_set_speed,
.set_mode = zynq_qspi_set_mode,
};
static const struct udevice_id zynq_qspi_ids[] = {
{ .compatible = "xlnx,zynq-qspi-1.0" },
{ }
};
U_BOOT_DRIVER(zynq_qspi) = {
.name = "zynq_qspi",
.id = UCLASS_SPI,
.of_match = zynq_qspi_ids,
.ops = &zynq_qspi_ops,
.ofdata_to_platdata = zynq_qspi_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct zynq_qspi_platdata),
.priv_auto_alloc_size = sizeof(struct zynq_qspi_priv),
.probe = zynq_qspi_probe,
};