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/*
* (C) Copyright 2013 Inc.
*
* Xilinx Zynq PS SPI controller driver (master mode only)
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <common.h>
#include <malloc.h>
#include <spi.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
/* zynq spi register bit masks ZYNQ_SPI_<REG>_<BIT>_MASK */
#define ZYNQ_SPI_CR_MSA_MASK (1 << 15) /* Manual start enb */
#define ZYNQ_SPI_CR_MCS_MASK (1 << 14) /* Manual chip select */
#define ZYNQ_SPI_CR_CS_MASK (0xF << 10) /* Chip select */
#define ZYNQ_SPI_CR_BRD_MASK (0x7 << 3) /* Baud rate div */
#define ZYNQ_SPI_CR_CPHA_MASK (1 << 2) /* Clock phase */
#define ZYNQ_SPI_CR_CPOL_MASK (1 << 1) /* Clock polarity */
#define ZYNQ_SPI_CR_MSTREN_MASK (1 << 0) /* Mode select */
#define ZYNQ_SPI_IXR_RXNEMPTY_MASK (1 << 4) /* RX_FIFO_not_empty */
#define ZYNQ_SPI_IXR_TXOW_MASK (1 << 2) /* TX_FIFO_not_full */
#define ZYNQ_SPI_IXR_ALL_MASK 0x7F /* All IXR bits */
#define ZYNQ_SPI_ENR_SPI_EN_MASK (1 << 0) /* SPI Enable */
#define ZYNQ_SPI_FIFO_DEPTH 128
#ifndef CONFIG_SYS_ZYNQ_SPI_WAIT
#define CONFIG_SYS_ZYNQ_SPI_WAIT (CONFIG_SYS_HZ/100) /* 10 ms */
#endif
/* zynq spi register set */
struct zynq_spi_regs {
u32 cr; /* 0x00 */
u32 isr; /* 0x04 */
u32 ier; /* 0x08 */
u32 idr; /* 0x0C */
u32 imr; /* 0x10 */
u32 enr; /* 0x14 */
u32 dr; /* 0x18 */
u32 txdr; /* 0x1C */
u32 rxdr; /* 0x20 */
};
/* zynq spi slave */
struct zynq_spi_slave {
struct spi_slave slave;
struct zynq_spi_regs *base;
u8 mode;
u8 fifo_depth;
u32 speed_hz;
u32 input_hz;
u32 req_hz;
};
static inline struct zynq_spi_slave *to_zynq_spi_slave(struct spi_slave *slave)
{
return container_of(slave, struct zynq_spi_slave, slave);
}
static inline struct zynq_spi_regs *get_zynq_spi_base(int dev)
{
if (dev)
return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR1;
else
return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR0;
}
static void zynq_spi_init_hw(struct zynq_spi_slave *zslave)
{
u32 confr;
/* Disable SPI */
writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
/* Disable Interrupts */
writel(ZYNQ_SPI_IXR_ALL_MASK, &zslave->base->idr);
/* Clear RX FIFO */
while (readl(&zslave->base->isr) &
ZYNQ_SPI_IXR_RXNEMPTY_MASK)
readl(&zslave->base->rxdr);
/* Clear Interrupts */
writel(ZYNQ_SPI_IXR_ALL_MASK, &zslave->base->isr);
/* Manual slave select and Auto start */
confr = ZYNQ_SPI_CR_MCS_MASK | ZYNQ_SPI_CR_CS_MASK |
ZYNQ_SPI_CR_MSTREN_MASK;
confr &= ~ZYNQ_SPI_CR_MSA_MASK;
writel(confr, &zslave->base->cr);
/* Enable SPI */
writel(ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
}
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
/* 2 bus with 3 chipselect */
return bus < 2 && cs < 3;
}
void spi_cs_activate(struct spi_slave *slave)
{
struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
u32 cr;
debug("spi_cs_activate: 0x%08x\n", (u32)slave);
clrbits_le32(&zslave->base->cr, ZYNQ_SPI_CR_CS_MASK);
cr = readl(&zslave->base->cr);
/*
* CS cal logic: CS[13:10]
* xxx0 - cs0
* xx01 - cs1
* x011 - cs2
*/
cr |= (~(0x1 << slave->cs) << 10) & ZYNQ_SPI_CR_CS_MASK;
writel(cr, &zslave->base->cr);
}
void spi_cs_deactivate(struct spi_slave *slave)
{
struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
debug("spi_cs_deactivate: 0x%08x\n", (u32)slave);
setbits_le32(&zslave->base->cr, ZYNQ_SPI_CR_CS_MASK);
}
void spi_init()
{
/* nothing to do */
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct zynq_spi_slave *zslave;
if (!spi_cs_is_valid(bus, cs))
return NULL;
zslave = spi_alloc_slave(struct zynq_spi_slave, bus, cs);
if (!zslave) {
printf("SPI_error: Fail to allocate zynq_spi_slave\n");
return NULL;
}
zslave->base = get_zynq_spi_base(bus);
zslave->mode = mode;
zslave->fifo_depth = ZYNQ_SPI_FIFO_DEPTH;
zslave->input_hz = 166666700;
zslave->speed_hz = zslave->input_hz / 2;
zslave->req_hz = max_hz;
/* init the zynq spi hw */
zynq_spi_init_hw(zslave);
return &zslave->slave;
}
void spi_free_slave(struct spi_slave *slave)
{
struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
debug("spi_free_slave: 0x%08x\n", (u32)slave);
free(zslave);
}
int spi_claim_bus(struct spi_slave *slave)
{
struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
u32 confr = 0;
u8 baud_rate_val = 0;
writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
/* Set the SPI Clock phase and polarities */
confr = readl(&zslave->base->cr);
confr &= ~(ZYNQ_SPI_CR_CPHA_MASK | ZYNQ_SPI_CR_CPOL_MASK);
if (zslave->mode & SPI_CPHA)
confr |= ZYNQ_SPI_CR_CPHA_MASK;
if (zslave->mode & SPI_CPOL)
confr |= ZYNQ_SPI_CR_CPOL_MASK;
/* Set the clock frequency */
if (zslave->req_hz == 0) {
/* Set baudrate x8, if the req_hz is 0 */
baud_rate_val = 0x2;
} else if (zslave->speed_hz != zslave->req_hz) {
while ((baud_rate_val < 8) &&
((zslave->input_hz /
(2 << baud_rate_val)) > zslave->req_hz))
baud_rate_val++;
zslave->speed_hz = zslave->req_hz / (2 << baud_rate_val);
}
confr &= ~ZYNQ_SPI_CR_BRD_MASK;
confr |= (baud_rate_val << 3);
writel(confr, &zslave->base->cr);
writel(ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
return 0;
}
void spi_release_bus(struct spi_slave *slave)
{
struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
debug("spi_release_bus: 0x%08x\n", (u32)slave);
writel(~ZYNQ_SPI_ENR_SPI_EN_MASK, &zslave->base->enr);
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
struct zynq_spi_slave *zslave = to_zynq_spi_slave(slave);
u32 len = bitlen / 8;
u32 tx_len = len, rx_len = len, tx_tvl;
const u8 *tx_buf = dout;
u8 *rx_buf = din, buf;
u32 ts, status;
debug("spi_xfer: bus:%i cs:%i bitlen:%i len:%i flags:%lx\n",
slave->bus, slave->cs, bitlen, len, flags);
if (bitlen == 0)
return -1;
if (bitlen % 8) {
debug("spi_xfer: Non byte aligned SPI transfer\n");
return -1;
}
if (flags & SPI_XFER_BEGIN)
spi_cs_activate(slave);
while (rx_len > 0) {
/* Write the data into TX FIFO - tx threshold is fifo_depth */
tx_tvl = 0;
while ((tx_tvl < zslave->fifo_depth) && tx_len) {
if (tx_buf)
buf = *tx_buf++;
else
buf = 0;
writel(buf, &zslave->base->txdr);
tx_len--;
tx_tvl++;
}
/* Check TX FIFO completion */
ts = get_timer(0);
status = readl(&zslave->base->isr);
while (!(status & ZYNQ_SPI_IXR_TXOW_MASK)) {
if (get_timer(ts) > CONFIG_SYS_ZYNQ_SPI_WAIT) {
printf("spi_xfer: Timeout! TX FIFO not full\n");
return -1;
}
status = readl(&zslave->base->isr);
}
/* Read the data from RX FIFO */
status = readl(&zslave->base->isr);
while (status & ZYNQ_SPI_IXR_RXNEMPTY_MASK) {
buf = readl(&zslave->base->rxdr);
if (rx_buf)
*rx_buf++ = buf;
status = readl(&zslave->base->isr);
rx_len--;
}
}
if (flags & SPI_XFER_END)
spi_cs_deactivate(slave);
return 0;
}
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