diff options
Diffstat (limited to 'drivers/spi/cf_qspi.c')
-rw-r--r-- | drivers/spi/cf_qspi.c | 354 |
1 files changed, 0 insertions, 354 deletions
diff --git a/drivers/spi/cf_qspi.c b/drivers/spi/cf_qspi.c deleted file mode 100644 index e57e63e..0000000 --- a/drivers/spi/cf_qspi.c +++ /dev/null @@ -1,354 +0,0 @@ -/* - * 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 to_cf_qspi_slave(s) container_of(s, struct cf_qspi_slave, slave) - -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, - 2lu, 255lu); - - /* 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 */ |