1 files changed, 401 insertions, 0 deletions
diff --git a/u-boot/drivers/spi/bfin_spi.c b/u-boot/drivers/spi/bfin_spi.c
new file mode 100644
index 0000000..d7e1474
--- /dev/null
+++ b/u-boot/drivers/spi/bfin_spi.c
@@ -0,0 +1,401 @@
+/*
+ * Driver for Blackfin On-Chip SPI device
+ *
+ * Copyright (c) 2005-2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+/*#define DEBUG*/
+
+#include <common.h>
+#include <malloc.h>
+#include <spi.h>
+
+#include <asm/blackfin.h>
+#include <asm/dma.h>
+#include <asm/gpio.h>
+#include <asm/portmux.h>
+#include <asm/mach-common/bits/spi.h>
+
+struct bfin_spi_slave {
+	struct spi_slave slave;
+	void *mmr_base;
+	u16 ctl, baud, flg;
+};
+
+#define MAKE_SPI_FUNC(mmr, off) \
+static inline void write_##mmr(struct bfin_spi_slave *bss, u16 val) { bfin_write16(bss->mmr_base + off, val); } \
+static inline u16 read_##mmr(struct bfin_spi_slave *bss) { return bfin_read16(bss->mmr_base + off); }
+MAKE_SPI_FUNC(SPI_CTL,  0x00)
+MAKE_SPI_FUNC(SPI_FLG,  0x04)
+MAKE_SPI_FUNC(SPI_STAT, 0x08)
+MAKE_SPI_FUNC(SPI_TDBR, 0x0c)
+MAKE_SPI_FUNC(SPI_RDBR, 0x10)
+MAKE_SPI_FUNC(SPI_BAUD, 0x14)
+
+#define to_bfin_spi_slave(s) container_of(s, struct bfin_spi_slave, slave)
+
+#define gpio_cs(cs) ((cs) - MAX_CTRL_CS)
+#ifdef CONFIG_BFIN_SPI_GPIO_CS
+# define is_gpio_cs(cs) ((cs) > MAX_CTRL_CS)
+#else
+# define is_gpio_cs(cs) 0
+#endif
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+	if (is_gpio_cs(cs))
+		return gpio_is_valid(gpio_cs(cs));
+	else
+		return (cs >= 1 && cs <= MAX_CTRL_CS);
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+	struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
+
+	if (is_gpio_cs(slave->cs)) {
+		unsigned int cs = gpio_cs(slave->cs);
+		gpio_set_value(cs, bss->flg);
+		debug("%s: SPI_CS_GPIO:%x\n", __func__, gpio_get_value(cs));
+	} else {
+		write_SPI_FLG(bss,
+			(read_SPI_FLG(bss) &
+			~((!bss->flg << 8) << slave->cs)) |
+			(1 << slave->cs));
+		debug("%s: SPI_FLG:%x\n", __func__, read_SPI_FLG(bss));
+	}
+
+	SSYNC();
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+	struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
+
+	if (is_gpio_cs(slave->cs)) {
+		unsigned int cs = gpio_cs(slave->cs);
+		gpio_set_value(cs, !bss->flg);
+		debug("%s: SPI_CS_GPIO:%x\n", __func__, gpio_get_value(cs));
+	} else {
+		u16 flg;
+
+		/* make sure we force the cs to deassert rather than let the
+		 * pin float back up.  otherwise, exact timings may not be
+		 * met some of the time leading to random behavior (ugh).
+		 */
+		flg = read_SPI_FLG(bss) | ((!bss->flg << 8) << slave->cs);
+		write_SPI_FLG(bss, flg);
+		SSYNC();
+		debug("%s: SPI_FLG:%x\n", __func__, read_SPI_FLG(bss));
+
+		flg &= ~(1 << slave->cs);
+		write_SPI_FLG(bss, flg);
+		debug("%s: SPI_FLG:%x\n", __func__, read_SPI_FLG(bss));
+	}
+
+	SSYNC();
+}
+
+void spi_init()
+{
+}
+
+#ifdef SPI_CTL
+# define SPI0_CTL SPI_CTL
+#endif
+
+#define SPI_PINS(n) \
+	[n] = { 0, P_SPI##n##_SCK, P_SPI##n##_MISO, P_SPI##n##_MOSI, 0 }
+static unsigned short pins[][5] = {
+#ifdef SPI0_CTL
+	SPI_PINS(0),
+#endif
+#ifdef SPI1_CTL
+	SPI_PINS(1),
+#endif
+#ifdef SPI2_CTL
+	SPI_PINS(2),
+#endif
+};
+
+#define SPI_CS_PINS(n) \
+	[n] = { \
+		P_SPI##n##_SSEL1, P_SPI##n##_SSEL2, P_SPI##n##_SSEL3, \
+		P_SPI##n##_SSEL4, P_SPI##n##_SSEL5, P_SPI##n##_SSEL6, \
+		P_SPI##n##_SSEL7, \
+	}
+static const unsigned short cs_pins[][7] = {
+#ifdef SPI0_CTL
+	SPI_CS_PINS(0),
+#endif
+#ifdef SPI1_CTL
+	SPI_CS_PINS(1),
+#endif
+#ifdef SPI2_CTL
+	SPI_CS_PINS(2),
+#endif
+};
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+		unsigned int max_hz, unsigned int mode)
+{
+	struct bfin_spi_slave *bss;
+	ulong sclk;
+	u32 mmr_base;
+	u32 baud;
+
+	if (!spi_cs_is_valid(bus, cs))
+		return NULL;
+
+	if (bus >= ARRAY_SIZE(pins) || pins[bus] == NULL) {
+		debug("%s: invalid bus %u\n", __func__, bus);
+		return NULL;
+	}
+	switch (bus) {
+#ifdef SPI0_CTL
+		case 0: mmr_base = SPI0_CTL; break;
+#endif
+#ifdef SPI1_CTL
+		case 1: mmr_base = SPI1_CTL; break;
+#endif
+#ifdef SPI2_CTL
+		case 2: mmr_base = SPI2_CTL; break;
+#endif
+		default: return NULL;
+	}
+
+	sclk = get_sclk();
+	baud = sclk / (2 * max_hz);
+	/* baud should be rounded up */
+	if (sclk % (2 * max_hz))
+		baud += 1;
+	if (baud < 2)
+		baud = 2;
+	else if (baud > (u16)-1)
+		baud = -1;
+
+	bss = malloc(sizeof(*bss));
+	if (!bss)
+		return NULL;
+
+	bss->slave.bus = bus;
+	bss->slave.cs = cs;
+	bss->mmr_base = (void *)mmr_base;
+	bss->ctl = SPE | MSTR | TDBR_CORE;
+	if (mode & SPI_CPHA) bss->ctl |= CPHA;
+	if (mode & SPI_CPOL) bss->ctl |= CPOL;
+	if (mode & SPI_LSB_FIRST) bss->ctl |= LSBF;
+	bss->baud = baud;
+	bss->flg = mode & SPI_CS_HIGH ? 1 : 0;
+
+	debug("%s: bus:%i cs:%i mmr:%x ctl:%x baud:%i flg:%i\n", __func__,
+		bus, cs, mmr_base, bss->ctl, baud, bss->flg);
+
+	return &bss->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+	struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
+	free(bss);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+	struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
+
+	debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
+
+	if (is_gpio_cs(slave->cs)) {
+		unsigned int cs = gpio_cs(slave->cs);
+		gpio_request(cs, "bfin-spi");
+		gpio_direction_output(cs, !bss->flg);
+		pins[slave->bus][0] = P_DONTCARE;
+	} else
+		pins[slave->bus][0] = cs_pins[slave->bus][slave->cs - 1];
+	peripheral_request_list(pins[slave->bus], "bfin-spi");
+
+	write_SPI_CTL(bss, bss->ctl);
+	write_SPI_BAUD(bss, bss->baud);
+	SSYNC();
+
+	return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+	struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
+
+	debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
+
+	peripheral_free_list(pins[slave->bus]);
+	if (is_gpio_cs(slave->cs))
+		gpio_free(gpio_cs(slave->cs));
+
+	write_SPI_CTL(bss, 0);
+	SSYNC();
+}
+
+#ifdef __ADSPBF54x__
+# define SPI_DMA_BASE DMA4_NEXT_DESC_PTR
+#elif defined(__ADSPBF533__) || defined(__ADSPBF532__) || defined(__ADSPBF531__) || \
+      defined(__ADSPBF538__) || defined(__ADSPBF539__)
+# define SPI_DMA_BASE DMA5_NEXT_DESC_PTR
+#elif defined(__ADSPBF561__)
+# define SPI_DMA_BASE DMA2_4_NEXT_DESC_PTR
+#elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__) || \
+      defined(__ADSPBF52x__) || defined(__ADSPBF51x__)
+# define SPI_DMA_BASE DMA7_NEXT_DESC_PTR
+#else
+# error "Please provide SPI DMA channel defines"
+#endif
+static volatile struct dma_register *dma = (void *)SPI_DMA_BASE;
+
+#ifndef CONFIG_BFIN_SPI_IDLE_VAL
+# define CONFIG_BFIN_SPI_IDLE_VAL 0xff
+#endif
+
+#ifdef CONFIG_BFIN_SPI_NO_DMA
+# define SPI_DMA 0
+#else
+# define SPI_DMA 1
+#endif
+
+static int spi_dma_xfer(struct bfin_spi_slave *bss, const u8 *tx, u8 *rx,
+			uint bytes)
+{
+	int ret = -1;
+	u16 ndsize, spi_config, dma_config;
+	struct dmasg dmasg[2];
+	const u8 *buf;
+
+	if (tx) {
+		debug("%s: doing half duplex TX\n", __func__);
+		buf = tx;
+		spi_config = TDBR_DMA;
+		dma_config = 0;
+	} else {
+		debug("%s: doing half duplex RX\n", __func__);
+		buf = rx;
+		spi_config = RDBR_DMA;
+		dma_config = WNR;
+	}
+
+	dmasg[0].start_addr = (unsigned long)buf;
+	dmasg[0].x_modify = 1;
+	dma_config |= WDSIZE_8 | DMAEN;
+	if (bytes <= 65536) {
+		blackfin_dcache_flush_invalidate_range(buf, buf + bytes);
+		ndsize = NDSIZE_5;
+		dmasg[0].cfg = NDSIZE_0 | dma_config | FLOW_STOP | DI_EN;
+		dmasg[0].x_count = bytes;
+	} else {
+		blackfin_dcache_flush_invalidate_range(buf, buf + 65536 - 1);
+		ndsize = NDSIZE_7;
+		dmasg[0].cfg = NDSIZE_5 | dma_config | FLOW_ARRAY | DMA2D;
+		dmasg[0].x_count = 0;	/* 2^16 */
+		dmasg[0].y_count = bytes >> 16;	/* count / 2^16 */
+		dmasg[0].y_modify = 1;
+		dmasg[1].start_addr = (unsigned long)(buf + (bytes & ~0xFFFF));
+		dmasg[1].cfg = NDSIZE_0 | dma_config | FLOW_STOP | DI_EN;
+		dmasg[1].x_count = bytes & 0xFFFF; /* count % 2^16 */
+		dmasg[1].x_modify = 1;
+	}
+
+	dma->cfg = 0;
+	dma->irq_status = DMA_DONE | DMA_ERR;
+	dma->curr_desc_ptr = dmasg;
+	write_SPI_CTL(bss, (bss->ctl & ~TDBR_CORE));
+	write_SPI_STAT(bss, -1);
+	SSYNC();
+
+	write_SPI_TDBR(bss, CONFIG_BFIN_SPI_IDLE_VAL);
+	dma->cfg = ndsize | FLOW_ARRAY | DMAEN;
+	write_SPI_CTL(bss, (bss->ctl & ~TDBR_CORE) | spi_config);
+	SSYNC();
+
+	/*
+	 * We already invalidated the first 64k,
+	 * now while we just wait invalidate the remaining part.
+	 * Its not likely that the DMA is going to overtake
+	 */
+	if (bytes > 65536)
+		blackfin_dcache_flush_invalidate_range(buf + 65536, buf + bytes);
+
+	while (!(dma->irq_status & DMA_DONE))
+		if (ctrlc())
+			goto done;
+
+	dma->cfg = 0;
+
+	ret = 0;
+ done:
+	write_SPI_CTL(bss, bss->ctl);
+	return ret;
+}
+
+static int spi_pio_xfer(struct bfin_spi_slave *bss, const u8 *tx, u8 *rx,
+			uint bytes)
+{
+	/* todo: take advantage of hardware fifos  */
+	while (bytes--) {
+		u8 value = (tx ? *tx++ : CONFIG_BFIN_SPI_IDLE_VAL);
+		debug("%s: tx:%x ", __func__, value);
+		write_SPI_TDBR(bss, value);
+		SSYNC();
+		while ((read_SPI_STAT(bss) & TXS))
+			if (ctrlc())
+				return -1;
+		while (!(read_SPI_STAT(bss) & SPIF))
+			if (ctrlc())
+				return -1;
+		while (!(read_SPI_STAT(bss) & RXS))
+			if (ctrlc())
+				return -1;
+		value = read_SPI_RDBR(bss);
+		if (rx)
+			*rx++ = value;
+		debug("rx:%x\n", value);
+	}
+
+	return 0;
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+		void *din, unsigned long flags)
+{
+	struct bfin_spi_slave *bss = to_bfin_spi_slave(slave);
+	const u8 *tx = dout;
+	u8 *rx = din;
+	uint bytes = bitlen / 8;
+	int ret = 0;
+
+	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;
+
+	/* we can only do 8 bit transfers */
+	if (bitlen % 8) {
+		flags |= SPI_XFER_END;
+		goto done;
+	}
+
+	if (flags & SPI_XFER_BEGIN)
+		spi_cs_activate(slave);
+
+	/* TX DMA doesn't work quite right */
+	if (SPI_DMA && bytes > 6 && (!tx /*|| !rx*/))
+		ret = spi_dma_xfer(bss, tx, rx, bytes);
+	else
+		ret = spi_pio_xfer(bss, tx, rx, bytes);
+
+ done:
+	if (flags & SPI_XFER_END)
+		spi_cs_deactivate(slave);
+
+	return ret;
+}