X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Froms%2Fu-boot%2Fdrivers%2Fspi%2Fatmel_spi.c;fp=qemu%2Froms%2Fu-boot%2Fdrivers%2Fspi%2Fatmel_spi.c;h=ed6278b86fdef4eac9851a7e1dc3802658c27fc6;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/qemu/roms/u-boot/drivers/spi/atmel_spi.c b/qemu/roms/u-boot/drivers/spi/atmel_spi.c
new file mode 100644
index 000000000..ed6278b86
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/spi/atmel_spi.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <spi.h>
+#include <malloc.h>
+
+#include <asm/io.h>
+
+#include <asm/arch/clk.h>
+#include <asm/arch/hardware.h>
+
+#include "atmel_spi.h"
+
+static int spi_has_wdrbt(struct atmel_spi_slave *slave)
+{
+	unsigned int ver;
+
+	ver = spi_readl(slave, VERSION);
+
+	return (ATMEL_SPI_VERSION_REV(ver) >= 0x210);
+}
+
+void spi_init()
+{
+
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+			unsigned int max_hz, unsigned int mode)
+{
+	struct atmel_spi_slave	*as;
+	unsigned int		scbr;
+	u32			csrx;
+	void			*regs;
+
+	if (!spi_cs_is_valid(bus, cs))
+		return NULL;
+
+	switch (bus) {
+	case 0:
+		regs = (void *)ATMEL_BASE_SPI0;
+		break;
+#ifdef ATMEL_BASE_SPI1
+	case 1:
+		regs = (void *)ATMEL_BASE_SPI1;
+		break;
+#endif
+#ifdef ATMEL_BASE_SPI2
+	case 2:
+		regs = (void *)ATMEL_BASE_SPI2;
+		break;
+#endif
+#ifdef ATMEL_BASE_SPI3
+	case 3:
+		regs = (void *)ATMEL_BASE_SPI3;
+		break;
+#endif
+	default:
+		return NULL;
+	}
+
+
+	scbr = (get_spi_clk_rate(bus) + max_hz - 1) / max_hz;
+	if (scbr > ATMEL_SPI_CSRx_SCBR_MAX)
+		/* Too low max SCK rate */
+		return NULL;
+	if (scbr < 1)
+		scbr = 1;
+
+	csrx = ATMEL_SPI_CSRx_SCBR(scbr);
+	csrx |= ATMEL_SPI_CSRx_BITS(ATMEL_SPI_BITS_8);
+	if (!(mode & SPI_CPHA))
+		csrx |= ATMEL_SPI_CSRx_NCPHA;
+	if (mode & SPI_CPOL)
+		csrx |= ATMEL_SPI_CSRx_CPOL;
+
+	as = spi_alloc_slave(struct atmel_spi_slave, bus, cs);
+	if (!as)
+		return NULL;
+
+	as->regs = regs;
+	as->mr = ATMEL_SPI_MR_MSTR | ATMEL_SPI_MR_MODFDIS
+			| ATMEL_SPI_MR_PCS(~(1 << cs) & 0xf);
+	if (spi_has_wdrbt(as))
+		as->mr |= ATMEL_SPI_MR_WDRBT;
+
+	spi_writel(as, CSR(cs), csrx);
+
+	return &as->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+	struct atmel_spi_slave *as = to_atmel_spi(slave);
+
+	free(as);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+	struct atmel_spi_slave *as = to_atmel_spi(slave);
+
+	/* Enable the SPI hardware */
+	spi_writel(as, CR, ATMEL_SPI_CR_SPIEN);
+
+	/*
+	 * Select the slave. This should set SCK to the correct
+	 * initial state, etc.
+	 */
+	spi_writel(as, MR, as->mr);
+
+	return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+	struct atmel_spi_slave *as = to_atmel_spi(slave);
+
+	/* Disable the SPI hardware */
+	spi_writel(as, CR, ATMEL_SPI_CR_SPIDIS);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
+		const void *dout, void *din, unsigned long flags)
+{
+	struct atmel_spi_slave *as = to_atmel_spi(slave);
+	unsigned int	len_tx;
+	unsigned int	len_rx;
+	unsigned int	len;
+	u32		status;
+	const u8	*txp = dout;
+	u8		*rxp = din;
+	u8		value;
+
+	if (bitlen == 0)
+		/* Finish any previously submitted transfers */
+		goto out;
+
+	/*
+	 * TODO: The controller can do non-multiple-of-8 bit
+	 * transfers, but this driver currently doesn't support it.
+	 *
+	 * It's also not clear how such transfers are supposed to be
+	 * represented as a stream of bytes...this is a limitation of
+	 * the current SPI interface.
+	 */
+	if (bitlen % 8) {
+		/* Errors always terminate an ongoing transfer */
+		flags |= SPI_XFER_END;
+		goto out;
+	}
+
+	len = bitlen / 8;
+
+	/*
+	 * The controller can do automatic CS control, but it is
+	 * somewhat quirky, and it doesn't really buy us much anyway
+	 * in the context of U-Boot.
+	 */
+	if (flags & SPI_XFER_BEGIN) {
+		spi_cs_activate(slave);
+		/*
+		 * sometimes the RDR is not empty when we get here,
+		 * in theory that should not happen, but it DOES happen.
+		 * Read it here to be on the safe side.
+		 * That also clears the OVRES flag. Required if the
+		 * following loop exits due to OVRES!
+		 */
+		spi_readl(as, RDR);
+	}
+
+	for (len_tx = 0, len_rx = 0; len_rx < len; ) {
+		status = spi_readl(as, SR);
+
+		if (status & ATMEL_SPI_SR_OVRES)
+			return -1;
+
+		if (len_tx < len && (status & ATMEL_SPI_SR_TDRE)) {
+			if (txp)
+				value = *txp++;
+			else
+				value = 0;
+			spi_writel(as, TDR, value);
+			len_tx++;
+		}
+		if (status & ATMEL_SPI_SR_RDRF) {
+			value = spi_readl(as, RDR);
+			if (rxp)
+				*rxp++ = value;
+			len_rx++;
+		}
+	}
+
+out:
+	if (flags & SPI_XFER_END) {
+		/*
+		 * Wait until the transfer is completely done before
+		 * we deactivate CS.
+		 */
+		do {
+			status = spi_readl(as, SR);
+		} while (!(status & ATMEL_SPI_SR_TXEMPTY));
+
+		spi_cs_deactivate(slave);
+	}
+
+	return 0;
+}