/* * Altera SPI driver * * based on bfin_spi.c * Copyright (c) 2005-2008 Analog Devices Inc. * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw> * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <asm/io.h> #include <malloc.h> #include <spi.h> #define ALTERA_SPI_RXDATA 0 #define ALTERA_SPI_TXDATA 4 #define ALTERA_SPI_STATUS 8 #define ALTERA_SPI_CONTROL 12 #define ALTERA_SPI_SLAVE_SEL 20 #define ALTERA_SPI_STATUS_ROE_MSK (0x8) #define ALTERA_SPI_STATUS_TOE_MSK (0x10) #define ALTERA_SPI_STATUS_TMT_MSK (0x20) #define ALTERA_SPI_STATUS_TRDY_MSK (0x40) #define ALTERA_SPI_STATUS_RRDY_MSK (0x80) #define ALTERA_SPI_STATUS_E_MSK (0x100) #define ALTERA_SPI_CONTROL_IROE_MSK (0x8) #define ALTERA_SPI_CONTROL_ITOE_MSK (0x10) #define ALTERA_SPI_CONTROL_ITRDY_MSK (0x40) #define ALTERA_SPI_CONTROL_IRRDY_MSK (0x80) #define ALTERA_SPI_CONTROL_IE_MSK (0x100) #define ALTERA_SPI_CONTROL_SSO_MSK (0x400) #ifndef CONFIG_SYS_ALTERA_SPI_LIST #define CONFIG_SYS_ALTERA_SPI_LIST { CONFIG_SYS_SPI_BASE } #endif static ulong altera_spi_base_list[] = CONFIG_SYS_ALTERA_SPI_LIST; struct altera_spi_slave { struct spi_slave slave; ulong base; }; #define to_altera_spi_slave(s) container_of(s, struct altera_spi_slave, slave) __attribute__((weak)) int spi_cs_is_valid(unsigned int bus, unsigned int cs) { return bus < ARRAY_SIZE(altera_spi_base_list) && cs < 32; } __attribute__((weak)) void spi_cs_activate(struct spi_slave *slave) { struct altera_spi_slave *altspi = to_altera_spi_slave(slave); writel(1 << slave->cs, altspi->base + ALTERA_SPI_SLAVE_SEL); writel(ALTERA_SPI_CONTROL_SSO_MSK, altspi->base + ALTERA_SPI_CONTROL); } __attribute__((weak)) void spi_cs_deactivate(struct spi_slave *slave) { struct altera_spi_slave *altspi = to_altera_spi_slave(slave); writel(0, altspi->base + ALTERA_SPI_CONTROL); writel(0, altspi->base + ALTERA_SPI_SLAVE_SEL); } void spi_init(void) { } void spi_set_speed(struct spi_slave *slave, uint hz) { /* altera spi core does not support programmable speed */ } struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, unsigned int max_hz, unsigned int mode) { struct altera_spi_slave *altspi; if (!spi_cs_is_valid(bus, cs)) return NULL; altspi = spi_alloc_slave(struct altera_spi_slave, bus, cs); if (!altspi) return NULL; altspi->base = altera_spi_base_list[bus]; debug("%s: bus:%i cs:%i base:%lx\n", __func__, bus, cs, altspi->base); return &altspi->slave; } void spi_free_slave(struct spi_slave *slave) { struct altera_spi_slave *altspi = to_altera_spi_slave(slave); free(altspi); } int spi_claim_bus(struct spi_slave *slave) { struct altera_spi_slave *altspi = to_altera_spi_slave(slave); debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs); writel(0, altspi->base + ALTERA_SPI_CONTROL); writel(0, altspi->base + ALTERA_SPI_SLAVE_SEL); return 0; } void spi_release_bus(struct spi_slave *slave) { struct altera_spi_slave *altspi = to_altera_spi_slave(slave); debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs); writel(0, altspi->base + ALTERA_SPI_SLAVE_SEL); } #ifndef CONFIG_ALTERA_SPI_IDLE_VAL # define CONFIG_ALTERA_SPI_IDLE_VAL 0xff #endif int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout, void *din, unsigned long flags) { struct altera_spi_slave *altspi = to_altera_spi_slave(slave); /* assume spi core configured to do 8 bit transfers */ uint bytes = bitlen / 8; const uchar *txp = dout; uchar *rxp = din; debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__, slave->bus, slave->cs, bitlen, bytes, flags); if (bitlen == 0) goto done; if (bitlen % 8) { flags |= SPI_XFER_END; goto done; } /* empty read buffer */ if (readl(altspi->base + ALTERA_SPI_STATUS) & ALTERA_SPI_STATUS_RRDY_MSK) readl(altspi->base + ALTERA_SPI_RXDATA); if (flags & SPI_XFER_BEGIN) spi_cs_activate(slave); while (bytes--) { uchar d = txp ? *txp++ : CONFIG_ALTERA_SPI_IDLE_VAL; debug("%s: tx:%x ", __func__, d); writel(d, altspi->base + ALTERA_SPI_TXDATA); while (!(readl(altspi->base + ALTERA_SPI_STATUS) & ALTERA_SPI_STATUS_RRDY_MSK)) ; d = readl(altspi->base + ALTERA_SPI_RXDATA); if (rxp) *rxp++ = d; debug("rx:%x\n", d); } done: if (flags & SPI_XFER_END) spi_cs_deactivate(slave); return 0; }