diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/spi/cf_qspi.c')
| -rw-r--r-- | qemu/roms/u-boot/drivers/spi/cf_qspi.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/spi/cf_qspi.c b/qemu/roms/u-boot/drivers/spi/cf_qspi.c new file mode 100644 index 000000000..6b8563366 --- /dev/null +++ b/qemu/roms/u-boot/drivers/spi/cf_qspi.c @@ -0,0 +1,355 @@ +/* + * Freescale Coldfire Queued SPI driver + * + * NOTE: + * This driver is written to transfer 8 bit at-a-time and uses the dedicated + * SPI slave select pins as bit-banged GPIO to work with spi_flash subsystem. + * + * Copyright (C) 2011 Ruggedcom, Inc. + * Richard Retanubun (richardretanubun@freescale.com) + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <malloc.h> +#include <spi.h> +#include <asm/immap.h> +#include <asm/io.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define clamp(x, low, high) (min(max(low, x), high)) +#define to_cf_qspi_slave(s) container_of(s, struct cf_qspi_slave, s) + +struct cf_qspi_slave { + struct spi_slave slave; /* Specific bus:cs ID for each device */ + qspi_t *regs; /* Pointer to SPI controller registers */ + u16 qmr; /* QMR: Queued Mode Register */ + u16 qwr; /* QWR: Queued Wrap Register */ + u16 qcr; /* QCR: Queued Command Ram */ +}; + +/* Register write wrapper functions */ +static void write_qmr(volatile qspi_t *qspi, u16 val) { qspi->mr = val; } +static void write_qdlyr(volatile qspi_t *qspi, u16 val) { qspi->dlyr = val; } +static void write_qwr(volatile qspi_t *qspi, u16 val) { qspi->wr = val; } +static void write_qir(volatile qspi_t *qspi, u16 val) { qspi->ir = val; } +static void write_qar(volatile qspi_t *qspi, u16 val) { qspi->ar = val; } +static void write_qdr(volatile qspi_t *qspi, u16 val) { qspi->dr = val; } +/* Register read wrapper functions */ +static u16 read_qdlyr(volatile qspi_t *qspi) { return qspi->dlyr; } +static u16 read_qwr(volatile qspi_t *qspi) { return qspi->wr; } +static u16 read_qir(volatile qspi_t *qspi) { return qspi->ir; } +static u16 read_qdr(volatile qspi_t *qspi) { return qspi->dr; } + +/* These call points may be different for each ColdFire CPU */ +extern void cfspi_port_conf(void); +static void cfspi_cs_activate(uint bus, uint cs, uint cs_active_high); +static void cfspi_cs_deactivate(uint bus, uint cs, uint cs_active_high); + +int spi_claim_bus(struct spi_slave *slave) +{ + return 0; +} +void spi_release_bus(struct spi_slave *slave) +{ +} + +__attribute__((weak)) +void spi_init(void) +{ + cfspi_port_conf(); +} + +__attribute__((weak)) +void spi_cs_activate(struct spi_slave *slave) +{ + struct cf_qspi_slave *dev = to_cf_qspi_slave(slave); + + cfspi_cs_activate(slave->bus, slave->cs, !(dev->qwr & QSPI_QWR_CSIV)); +} + +__attribute__((weak)) +void spi_cs_deactivate(struct spi_slave *slave) +{ + struct cf_qspi_slave *dev = to_cf_qspi_slave(slave); + + cfspi_cs_deactivate(slave->bus, slave->cs, !(dev->qwr & QSPI_QWR_CSIV)); +} + +__attribute__((weak)) +int spi_cs_is_valid(unsigned int bus, unsigned int cs) +{ + /* Only 1 bus and 4 chipselect per controller */ + if (bus == 0 && (cs >= 0 && cs < 4)) + return 1; + else + return 0; +} + +void spi_free_slave(struct spi_slave *slave) +{ + struct cf_qspi_slave *dev = to_cf_qspi_slave(slave); + + free(dev); +} + +/* Translate information given by spi_setup_slave to members of cf_qspi_slave */ +struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, + unsigned int max_hz, unsigned int mode) +{ + struct cf_qspi_slave *dev = NULL; + + if (!spi_cs_is_valid(bus, cs)) + return NULL; + + dev = spi_alloc_slave(struct cf_qspi_slave, bus, cs); + if (!dev) + return NULL; + + /* Initialize to known value */ + dev->regs = (qspi_t *)MMAP_QSPI; + dev->qmr = 0; + dev->qwr = 0; + dev->qcr = 0; + + + /* Map max_hz to QMR[BAUD] */ + if (max_hz == 0) /* Go as fast as possible */ + dev->qmr = 2u; + else /* Get the closest baud rate */ + dev->qmr = clamp(((gd->bus_clk >> 2) + max_hz - 1)/max_hz, + 2u, 255u); + + /* Map mode to QMR[CPOL] and QMR[CPHA] */ + if (mode & SPI_CPOL) + dev->qmr |= QSPI_QMR_CPOL; + + if (mode & SPI_CPHA) + dev->qmr |= QSPI_QMR_CPHA; + + /* Hardcode bit length to 8 bit per transter */ + dev->qmr |= QSPI_QMR_BITS_8; + + /* Set QMR[MSTR] to enable QSPI as master */ + dev->qmr |= QSPI_QMR_MSTR; + + /* + * Set QCR and QWR to default values for spi flash operation. + * If more custom QCR and QRW are needed, overload mode variable + */ + dev->qcr = (QSPI_QDR_CONT | QSPI_QDR_BITSE); + + if (!(mode & SPI_CS_HIGH)) + dev->qwr |= QSPI_QWR_CSIV; + + return &dev->slave; +} + +/* Transfer 8 bit at a time */ +int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, + void *din, unsigned long flags) +{ + struct cf_qspi_slave *dev = to_cf_qspi_slave(slave); + volatile qspi_t *qspi = dev->regs; + u8 *txbuf = (u8 *)dout; + u8 *rxbuf = (u8 *)din; + u32 count = DIV_ROUND_UP(bitlen, 8); + u32 n, i = 0; + + /* Sanitize arguments */ + if (slave == NULL) { + printf("%s: NULL slave ptr\n", __func__); + return -1; + } + + if (flags & SPI_XFER_BEGIN) + spi_cs_activate(slave); + + /* There is something to send, lets process it. spi_xfer is also called + * just to toggle chip select, so bitlen of 0 is valid */ + if (count > 0) { + /* + * NOTE: Since chip select is driven as a bit-bang-ed GPIO + * using spi_cs_activate() and spi_cs_deactivate(), + * the chip select settings inside the controller + * (i.e. QCR[CONT] and QWR[CSIV]) are moot. The bits are set to + * keep the controller settings consistent with the actual + * operation of the bus. + */ + + /* Write the slave device's settings for the controller.*/ + write_qmr(qspi, dev->qmr); + write_qwr(qspi, dev->qwr); + + /* Limit transfer to 16 at a time */ + n = min(count, 16u); + do { + /* Setup queue end point */ + write_qwr(qspi, ((read_qwr(qspi) & QSPI_QWR_ENDQP_MASK) + | QSPI_QWR_ENDQP((n-1)))); + + /* Write Command RAM */ + write_qar(qspi, QSPI_QAR_CMD); + for (i = 0; i < n; ++i) + write_qdr(qspi, dev->qcr); + + /* Write TxBuf, if none given, fill with ZEROes */ + write_qar(qspi, QSPI_QAR_TRANS); + if (txbuf) { + for (i = 0; i < n; ++i) + write_qdr(qspi, *txbuf++); + } else { + for (i = 0; i < n; ++i) + write_qdr(qspi, 0); + } + + /* Clear QIR[SPIF] by writing a 1 to it */ + write_qir(qspi, read_qir(qspi) | QSPI_QIR_SPIF); + /* Set QDLYR[SPE] to start sending */ + write_qdlyr(qspi, read_qdlyr(qspi) | QSPI_QDLYR_SPE); + + /* Poll QIR[SPIF] for transfer completion */ + while ((read_qir(qspi) & QSPI_QIR_SPIF) != 1) + udelay(1); + + /* If given read RxBuf, load data to it */ + if (rxbuf) { + write_qar(qspi, QSPI_QAR_RECV); + for (i = 0; i < n; ++i) + *rxbuf++ = read_qdr(qspi); + } + + /* Decrement count */ + count -= n; + } while (count); + } + + if (flags & SPI_XFER_END) + spi_cs_deactivate(slave); + + return 0; +} + +/* Each MCF CPU may have different pin assignments for chip selects. */ +#if defined(CONFIG_M5271) +/* Assert chip select, val = [1|0] , dir = out, mode = GPIO */ +void cfspi_cs_activate(uint bus, uint cs, uint cs_active_high) +{ + debug("%s: bus %d cs %d cs_active_high %d\n", + __func__, bus, cs, cs_active_high); + + switch (cs) { + case 0: /* QSPI_CS[0] = PQSPI[3] */ + if (cs_active_high) + mbar_writeByte(MCF_GPIO_PPDSDR_QSPI, 0x08); + else + mbar_writeByte(MCF_GPIO_PCLRR_QSPI, 0xF7); + + mbar_writeByte(MCF_GPIO_PDDR_QSPI, + mbar_readByte(MCF_GPIO_PDDR_QSPI) | 0x08); + + mbar_writeByte(MCF_GPIO_PAR_QSPI, + mbar_readByte(MCF_GPIO_PAR_QSPI) & 0xDF); + break; + case 1: /* QSPI_CS[1] = PQSPI[4] */ + if (cs_active_high) + mbar_writeByte(MCF_GPIO_PPDSDR_QSPI, 0x10); + else + mbar_writeByte(MCF_GPIO_PCLRR_QSPI, 0xEF); + + mbar_writeByte(MCF_GPIO_PDDR_QSPI, + mbar_readByte(MCF_GPIO_PDDR_QSPI) | 0x10); + + mbar_writeByte(MCF_GPIO_PAR_QSPI, + mbar_readByte(MCF_GPIO_PAR_QSPI) & 0x3F); + break; + case 2: /* QSPI_CS[2] = PTIMER[7] */ + if (cs_active_high) + mbar_writeByte(MCF_GPIO_PPDSDR_TIMER, 0x80); + else + mbar_writeByte(MCF_GPIO_PCLRR_TIMER, 0x7F); + + mbar_writeByte(MCF_GPIO_PDDR_TIMER, + mbar_readByte(MCF_GPIO_PDDR_TIMER) | 0x80); + + mbar_writeShort(MCF_GPIO_PAR_TIMER, + mbar_readShort(MCF_GPIO_PAR_TIMER) & 0x3FFF); + break; + case 3: /* QSPI_CS[3] = PTIMER[3] */ + if (cs_active_high) + mbar_writeByte(MCF_GPIO_PPDSDR_TIMER, 0x08); + else + mbar_writeByte(MCF_GPIO_PCLRR_TIMER, 0xF7); + + mbar_writeByte(MCF_GPIO_PDDR_TIMER, + mbar_readByte(MCF_GPIO_PDDR_TIMER) | 0x08); + + mbar_writeShort(MCF_GPIO_PAR_TIMER, + mbar_readShort(MCF_GPIO_PAR_TIMER) & 0xFF3F); + break; + } +} + +/* Deassert chip select, val = [1|0], dir = in, mode = GPIO + * direction set as IN to undrive the pin, external pullup/pulldown will bring + * bus to deassert state. + */ +void cfspi_cs_deactivate(uint bus, uint cs, uint cs_active_high) +{ + debug("%s: bus %d cs %d cs_active_high %d\n", + __func__, bus, cs, cs_active_high); + + switch (cs) { + case 0: /* QSPI_CS[0] = PQSPI[3] */ + if (cs_active_high) + mbar_writeByte(MCF_GPIO_PCLRR_QSPI, 0xF7); + else + mbar_writeByte(MCF_GPIO_PPDSDR_QSPI, 0x08); + + mbar_writeByte(MCF_GPIO_PDDR_QSPI, + mbar_readByte(MCF_GPIO_PDDR_QSPI) & 0xF7); + + mbar_writeByte(MCF_GPIO_PAR_QSPI, + mbar_readByte(MCF_GPIO_PAR_QSPI) & 0xDF); + break; + case 1: /* QSPI_CS[1] = PQSPI[4] */ + if (cs_active_high) + mbar_writeByte(MCF_GPIO_PCLRR_QSPI, 0xEF); + else + mbar_writeByte(MCF_GPIO_PPDSDR_QSPI, 0x10); + + mbar_writeByte(MCF_GPIO_PDDR_QSPI, + mbar_readByte(MCF_GPIO_PDDR_QSPI) & 0xEF); + + mbar_writeByte(MCF_GPIO_PAR_QSPI, + mbar_readByte(MCF_GPIO_PAR_QSPI) & 0x3F); + break; + case 2: /* QSPI_CS[2] = PTIMER[7] */ + if (cs_active_high) + mbar_writeByte(MCF_GPIO_PCLRR_TIMER, 0x7F); + else + mbar_writeByte(MCF_GPIO_PPDSDR_TIMER, 0x80); + + mbar_writeByte(MCF_GPIO_PDDR_TIMER, + mbar_readByte(MCF_GPIO_PDDR_TIMER) & 0x7F); + + mbar_writeShort(MCF_GPIO_PAR_TIMER, + mbar_readShort(MCF_GPIO_PAR_TIMER) & 0x3FFF); + break; + case 3: /* QSPI_CS[3] = PTIMER[3] */ + if (cs_active_high) + mbar_writeByte(MCF_GPIO_PCLRR_TIMER, 0xF7); + else + mbar_writeByte(MCF_GPIO_PPDSDR_TIMER, 0x08); + + mbar_writeByte(MCF_GPIO_PDDR_TIMER, + mbar_readByte(MCF_GPIO_PDDR_TIMER) & 0xF7); + + mbar_writeShort(MCF_GPIO_PAR_TIMER, + mbar_readShort(MCF_GPIO_PAR_TIMER) & 0xFF3F); + break; + } +} +#endif /* CONFIG_M5271 */ |