diff options
Diffstat (limited to 'drivers/spi/sh_qspi.c')
| -rw-r--r-- | drivers/spi/sh_qspi.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/drivers/spi/sh_qspi.c b/drivers/spi/sh_qspi.c new file mode 100644 index 0000000..edeb42d --- /dev/null +++ b/drivers/spi/sh_qspi.c @@ -0,0 +1,277 @@ +/* + * SH QSPI (Quad SPI) driver + * + * Copyright (C) 2013 Renesas Electronics Corporation + * Copyright (C) 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <malloc.h> +#include <spi.h> +#include <asm/io.h> + +/* SH QSPI register bit masks <REG>_<BIT> */ +#define SPCR_MSTR 0x08 +#define SPCR_SPE 0x40 +#define SPSR_SPRFF 0x80 +#define SPSR_SPTEF 0x20 +#define SPPCR_IO3FV 0x04 +#define SPPCR_IO2FV 0x02 +#define SPPCR_IO1FV 0x01 +#define SPBDCR_RXBC0 (1 << 0) +#define SPCMD_SCKDEN (1 << 15) +#define SPCMD_SLNDEN (1 << 14) +#define SPCMD_SPNDEN (1 << 13) +#define SPCMD_SSLKP (1 << 7) +#define SPCMD_BRDV0 (1 << 2) +#define SPCMD_INIT1 SPCMD_SCKDEN | SPCMD_SLNDEN | \ + SPCMD_SPNDEN | SPCMD_SSLKP | \ + SPCMD_BRDV0 +#define SPCMD_INIT2 SPCMD_SPNDEN | SPCMD_SSLKP | \ + SPCMD_BRDV0 +#define SPBFCR_TXRST (1 << 7) +#define SPBFCR_RXRST (1 << 6) + +/* SH QSPI register set */ +struct sh_qspi_regs { + unsigned char spcr; + unsigned char sslp; + unsigned char sppcr; + unsigned char spsr; + unsigned long spdr; + unsigned char spscr; + unsigned char spssr; + unsigned char spbr; + unsigned char spdcr; + unsigned char spckd; + unsigned char sslnd; + unsigned char spnd; + unsigned char dummy0; + unsigned short spcmd0; + unsigned short spcmd1; + unsigned short spcmd2; + unsigned short spcmd3; + unsigned char spbfcr; + unsigned char dummy1; + unsigned short spbdcr; + unsigned long spbmul0; + unsigned long spbmul1; + unsigned long spbmul2; + unsigned long spbmul3; +}; + +struct sh_qspi_slave { + struct spi_slave slave; + struct sh_qspi_regs *regs; +}; + +static inline struct sh_qspi_slave *to_sh_qspi(struct spi_slave *slave) +{ + return container_of(slave, struct sh_qspi_slave, slave); +} + +static void sh_qspi_init(struct sh_qspi_slave *ss) +{ + /* QSPI initialize */ + /* Set master mode only */ + writeb(SPCR_MSTR, &ss->regs->spcr); + + /* Set SSL signal level */ + writeb(0x00, &ss->regs->sslp); + + /* Set MOSI signal value when transfer is in idle state */ + writeb(SPPCR_IO3FV|SPPCR_IO2FV, &ss->regs->sppcr); + + /* Set bit rate. See 58.3.8 Quad Serial Peripheral Interface */ + writeb(0x01, &ss->regs->spbr); + + /* Disable Dummy Data Transmission */ + writeb(0x00, &ss->regs->spdcr); + + /* Set clock delay value */ + writeb(0x00, &ss->regs->spckd); + + /* Set SSL negation delay value */ + writeb(0x00, &ss->regs->sslnd); + + /* Set next-access delay value */ + writeb(0x00, &ss->regs->spnd); + + /* Set equence command */ + writew(SPCMD_INIT2, &ss->regs->spcmd0); + + /* Reset transfer and receive Buffer */ + setbits_8(&ss->regs->spbfcr, SPBFCR_TXRST|SPBFCR_RXRST); + + /* Clear transfer and receive Buffer control bit */ + clrbits_8(&ss->regs->spbfcr, SPBFCR_TXRST|SPBFCR_RXRST); + + /* Set equence control method. Use equence0 only */ + writeb(0x00, &ss->regs->spscr); + + /* Enable SPI function */ + setbits_8(&ss->regs->spcr, SPCR_SPE); +} + +int spi_cs_is_valid(unsigned int bus, unsigned int cs) +{ + return 1; +} + +void spi_cs_activate(struct spi_slave *slave) +{ + struct sh_qspi_slave *ss = to_sh_qspi(slave); + + /* Set master mode only */ + writeb(SPCR_MSTR, &ss->regs->spcr); + + /* Set command */ + writew(SPCMD_INIT1, &ss->regs->spcmd0); + + /* Reset transfer and receive Buffer */ + setbits_8(&ss->regs->spbfcr, SPBFCR_TXRST|SPBFCR_RXRST); + + /* Clear transfer and receive Buffer control bit */ + clrbits_8(&ss->regs->spbfcr, SPBFCR_TXRST|SPBFCR_RXRST); + + /* Set equence control method. Use equence0 only */ + writeb(0x00, &ss->regs->spscr); + + /* Enable SPI function */ + setbits_8(&ss->regs->spcr, SPCR_SPE); +} + +void spi_cs_deactivate(struct spi_slave *slave) +{ + struct sh_qspi_slave *ss = to_sh_qspi(slave); + + /* Disable SPI Function */ + clrbits_8(&ss->regs->spcr, SPCR_SPE); +} + +void spi_init(void) +{ + /* nothing to do */ +} + +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + struct sh_qspi_slave *ss; + + if (!spi_cs_is_valid(bus, cs)) + return NULL; + + ss = spi_alloc_slave(struct sh_qspi_slave, bus, cs); + if (!ss) { + printf("SPI_error: Fail to allocate sh_qspi_slave\n"); + return NULL; + } + + ss->regs = (struct sh_qspi_regs *)CONFIG_SH_QSPI_BASE; + + /* Init SH QSPI */ + sh_qspi_init(ss); + + return &ss->slave; +} + +void spi_free_slave(struct spi_slave *slave) +{ + struct sh_qspi_slave *spi = to_sh_qspi(slave); + + free(spi); +} + +int spi_claim_bus(struct spi_slave *slave) +{ + return 0; +} + +void spi_release_bus(struct spi_slave *slave) +{ +} + +int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, + void *din, unsigned long flags) +{ + struct sh_qspi_slave *ss = to_sh_qspi(slave); + unsigned long nbyte; + int ret = 0; + unsigned char dtdata = 0, drdata; + unsigned char *tdata = &dtdata, *rdata = &drdata; + unsigned long *spbmul0 = &ss->regs->spbmul0; + + if (dout == NULL && din == NULL) { + if (flags & SPI_XFER_END) + spi_cs_deactivate(slave); + return 0; + } + + if (bitlen % 8) { + printf("%s: bitlen is not 8bit alined %d", __func__, bitlen); + return 1; + } + + nbyte = bitlen / 8; + + if (flags & SPI_XFER_BEGIN) { + spi_cs_activate(slave); + + /* Set 1048576 byte */ + writel(0x100000, spbmul0); + } + + if (flags & SPI_XFER_END) + writel(nbyte, spbmul0); + + if (dout != NULL) + tdata = (unsigned char *)dout; + + if (din != NULL) + rdata = din; + + while (nbyte > 0) { + while (!(readb(&ss->regs->spsr) & SPSR_SPTEF)) { + if (ctrlc()) { + puts("abort\n"); + return 1; + } + udelay(10); + } + + writeb(*tdata, (unsigned char *)(&ss->regs->spdr)); + + while ((readw(&ss->regs->spbdcr) != SPBDCR_RXBC0)) { + if (ctrlc()) { + puts("abort\n"); + return 1; + } + udelay(1); + } + + while (!(readb(&ss->regs->spsr) & SPSR_SPRFF)) { + if (ctrlc()) { + puts("abort\n"); + return 1; + } + udelay(10); + } + + *rdata = readb((unsigned char *)(&ss->regs->spdr)); + + if (dout != NULL) + tdata++; + if (din != NULL) + rdata++; + + nbyte--; + } + + if (flags & SPI_XFER_END) + spi_cs_deactivate(slave); + + return ret; +} |