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drivers/spi/mpc8xxx_spi.c
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/* * Copyright (c) 2006 Ben Warren, Qstreams Networks Inc. |
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* With help from the common/soft_spi and arch/powerpc/cpu/mpc8260 drivers |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ #include <common.h> |
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#include <malloc.h> |
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#include <spi.h> #include <asm/mpc8xxx_spi.h> |
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#define SPI_EV_NE (0x80000000 >> 22) /* Receiver Not Empty */ #define SPI_EV_NF (0x80000000 >> 23) /* Transmitter Not Full */ |
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#define SPI_MODE_LOOP (0x80000000 >> 1) /* Loopback mode */ #define SPI_MODE_REV (0x80000000 >> 5) /* Reverse mode - MSB first */ #define SPI_MODE_MS (0x80000000 >> 6) /* Always master */ #define SPI_MODE_EN (0x80000000 >> 7) /* Enable interface */ |
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#define SPI_TIMEOUT 1000 |
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struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, unsigned int max_hz, unsigned int mode) { struct spi_slave *slave; if (!spi_cs_is_valid(bus, cs)) return NULL; |
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slave = spi_alloc_slave_base(bus, cs); |
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if (!slave) return NULL; |
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/* * TODO: Some of the code in spi_init() should probably move * here, or into spi_claim_bus() below. */ return slave; } void spi_free_slave(struct spi_slave *slave) { free(slave); } |
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void spi_init(void) { |
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volatile spi8xxx_t *spi = &((immap_t *) (CONFIG_SYS_IMMR))->spi; |
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/* |
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* SPI pins on the MPC83xx are not muxed, so all we do is initialize * some registers |
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*/ |
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spi->mode = SPI_MODE_REV | SPI_MODE_MS | SPI_MODE_EN; |
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spi->mode = (spi->mode & 0xfff0ffff) | BIT(16); /* Use SYSCLK / 8 |
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(16.67MHz typ.) */ |
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spi->event = 0xffffffff; /* Clear all SPI events */ spi->mask = 0x00000000; /* Mask all SPI interrupts */ spi->com = 0; /* LST bit doesn't do anything, so disregard */ } |
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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) |
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{ |
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volatile spi8xxx_t *spi = &((immap_t *) (CONFIG_SYS_IMMR))->spi; |
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unsigned int tmpdout, tmpdin, event; |
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int numBlks = DIV_ROUND_UP(bitlen, 32); |
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int tm, isRead = 0; unsigned char charSize = 32; |
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debug("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u ", slave->bus, slave->cs, *(uint *) dout, *(uint *) din, bitlen); |
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if (flags & SPI_XFER_BEGIN) spi_cs_activate(slave); |
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spi->event = 0xffffffff; /* Clear all SPI events */ /* handle data in 32-bit chunks */ while (numBlks--) { tmpdout = 0; charSize = (bitlen >= 32 ? 32 : bitlen); /* Shift data so it's msb-justified */ tmpdout = *(u32 *) dout >> (32 - charSize); /* The LEN field of the SPMODE register is set as follows: * |
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* Bit length setting * len <= 4 3 * 4 < len <= 16 len - 1 * len > 16 0 |
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*/ |
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spi->mode &= ~SPI_MODE_EN; |
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if (bitlen <= 16) { if (bitlen <= 4) spi->mode = (spi->mode & 0xff0fffff) | |
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(3 << 20); |
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else spi->mode = (spi->mode & 0xff0fffff) | |
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((bitlen - 1) << 20); |
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} else { spi->mode = (spi->mode & 0xff0fffff); |
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/* Set up the next iteration if sending > 32 bits */ bitlen -= 32; dout += 4; } |
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spi->mode |= SPI_MODE_EN; |
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spi->tx = tmpdout; /* Write the data out */ debug("*** spi_xfer: ... %08x written ", tmpdout); |
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/* |
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* Wait for SPI transmit to get out * or time out (1 second = 1000 ms) * The NE event must be read and cleared first |
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*/ |
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for (tm = 0, isRead = 0; tm < SPI_TIMEOUT; ++tm) { event = spi->event; if (event & SPI_EV_NE) { tmpdin = spi->rx; spi->event |= SPI_EV_NE; isRead = 1; *(u32 *) din = (tmpdin << (32 - charSize)); if (charSize == 32) { /* Advance output buffer by 32 bits */ din += 4; } } |
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/* * Only bail when we've had both NE and NF events. |
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* This will cause timeouts on RO devices, so maybe * in the future put an arbitrary delay after writing |
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* the device. Arbitrary delays suck, though... */ |
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if (isRead && (event & SPI_EV_NF)) break; } if (tm >= SPI_TIMEOUT) puts("*** spi_xfer: Time out during SPI transfer"); debug("*** spi_xfer: transfer ended. Value=%08x ", tmpdin); } |
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if (flags & SPI_XFER_END) spi_cs_deactivate(slave); |
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return 0; } |