[U-Boot] [PATCH v3 04/10] SPI: Add Orion SPI driver
Sebastian Hesselbarth
sebastian.hesselbarth at gmail.com
Wed Jan 16 20:25:22 CET 2013
This adds an SPI driver found on Marvell Orion SoCs. This driver is
taken from kirkwood_spi but removes mpp configuration as dove has
dedicated spi pins. To have a common driver for orion5x, kirkwood,
and dove, mpp configuration should be handled in some cpu/board-specific
setup.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
---
Cc: u-boot at lists.denx.de
Cc: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
Cc: Rabeeh Khoury <rabeeh at solid-run.com>
Cc: Albert Aribaud <albert.u.boot at aribaud.net>
Cc: Prafulla Wadaskar <prafulla at marvell.com>
Cc: Andy Fleming <afleming at gmail.com>
Cc: Joe Hershberger <joe.hershberger at gmail.com>
Cc: Daniel Stodden <daniel.stodden at gmail.com>
Cc: Luka Perkov <luka at openwrt.org>
---
drivers/spi/Makefile | 1 +
drivers/spi/orion_spi.c | 217 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 218 insertions(+)
create mode 100644 drivers/spi/orion_spi.c
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 824d357..624bb72 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -35,6 +35,7 @@ COBJS-$(CONFIG_CF_SPI) += cf_spi.o
COBJS-$(CONFIG_CF_QSPI) += cf_qspi.o
COBJS-$(CONFIG_DAVINCI_SPI) += davinci_spi.o
COBJS-$(CONFIG_EXYNOS_SPI) += exynos_spi.o
+COBJS-$(CONFIG_ORION_SPI) += orion_spi.o
COBJS-$(CONFIG_KIRKWOOD_SPI) += kirkwood_spi.o
COBJS-$(CONFIG_MPC52XX_SPI) += mpc52xx_spi.o
COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
diff --git a/drivers/spi/orion_spi.c b/drivers/spi/orion_spi.c
new file mode 100644
index 0000000..8a50531
--- /dev/null
+++ b/drivers/spi/orion_spi.c
@@ -0,0 +1,217 @@
+/*
+ * Marvell Orion SoCs common spi driver
+ *
+ * Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
+ * based on kirkwood_spi.c written by
+ * Prafulla Wadaskar <prafulla at marvell.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <spi.h>
+#include <asm/io.h>
+#include <asm/arch/config.h>
+
+/* SPI Registers on orion SOC */
+struct orionspi_registers {
+ u32 ctrl; /* 0x00 */
+ u32 cfg; /* 0x04 */
+ u32 dout; /* 0x08 */
+ u32 din; /* 0x0c */
+ u32 irq_cause; /* 0x10 */
+ u32 irq_mask; /* 0x14 */
+};
+
+#define ORIONSPI_CLKPRESCL_MASK 0x1f
+#define ORIONSPI_CLKPRESCL_MIN 0x12
+#define ORIONSPI_CSN_ACT 1 /* Activates serial memory interface */
+#define ORIONSPI_SMEMRDY (1 << 1) /* SerMem Data xfer ready */
+#define ORIONSPI_IRQUNMASK 1 /* unmask SPI interrupt */
+#define ORIONSPI_IRQMASK 0 /* mask SPI interrupt */
+#define ORIONSPI_SMEMRDIRQ 1 /* SerMem data xfer ready irq */
+#define ORIONSPI_XFERLEN_1BYTE 0
+#define ORIONSPI_XFERLEN_2BYTE (1 << 5)
+#define ORIONSPI_XFERLEN_MASK (1 << 5)
+#define ORIONSPI_ADRLEN_1BYTE 0
+#define ORIONSPI_ADRLEN_2BYTE (1 << 8)
+#define ORIONSPI_ADRLEN_3BYTE (2 << 8)
+#define ORIONSPI_ADRLEN_4BYTE (3 << 8)
+#define ORIONSPI_ADRLEN_MASK (3 << 8)
+#define ORIONSPI_TIMEOUT 10000
+
+static struct orionspi_registers *spireg =
+ (struct orionspi_registers *)ORION_SPI_BASE;
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+ unsigned int max_hz, unsigned int mode)
+{
+ struct spi_slave *slave;
+ u32 data;
+ u32 kwspi_mpp_config[] = { 0, 0 };
+
+ if (!spi_cs_is_valid(bus, cs))
+ return NULL;
+
+ slave = malloc(sizeof(struct spi_slave));
+ if (!slave)
+ return NULL;
+
+ slave->bus = bus;
+ slave->cs = cs;
+
+ writel(~ORIONSPI_CSN_ACT | ORIONSPI_SMEMRDY, &spireg->ctrl);
+
+ /* calculate spi clock prescaller using max_hz */
+ data = ((CONFIG_SYS_TCLK / 2) / max_hz) + 0x10;
+ data = data < ORIONSPI_CLKPRESCL_MIN ? ORIONSPI_CLKPRESCL_MIN : data;
+ data = data > ORIONSPI_CLKPRESCL_MASK ? ORIONSPI_CLKPRESCL_MASK : data;
+
+ /* program spi clock prescaller using max_hz */
+ writel(ORIONSPI_ADRLEN_3BYTE | data, &spireg->cfg);
+ debug("data = 0x%08x\n", data);
+
+ writel(ORIONSPI_SMEMRDIRQ, &spireg->irq_cause);
+ writel(ORIONSPI_IRQMASK, &spireg->irq_mask);
+
+ return slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+ free(slave);
+}
+
+#if defined(CONFIG_SYS_KW_SPI_MPP)
+u32 spi_mpp_backup[4];
+#endif
+
+__attribute__((weak)) int board_spi_claim_bus(struct spi_slave *slave)
+{
+ return 0;
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+ return board_spi_claim_bus(slave);
+}
+
+__attribute__((weak)) void board_spi_release_bus(struct spi_slave *slave)
+{
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+ board_spi_release_bus(slave);
+}
+
+#ifndef CONFIG_SPI_CS_IS_VALID
+/*
+ * you can define this function board specific
+ * define above CONFIG in board specific config file and
+ * provide the function in board specific src file
+ */
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ return (bus == 0 && (cs == 0 || cs == 1));
+}
+#endif
+
+void spi_init(void)
+{
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+ writel(readl(&spireg->ctrl) | ORIONSPI_IRQUNMASK, &spireg->ctrl);
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+ writel(readl(&spireg->ctrl) & ORIONSPI_IRQMASK, &spireg->ctrl);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+ void *din, unsigned long flags)
+{
+ unsigned int tmpdout, tmpdin;
+ int tm, isread = 0;
+
+ debug("spi_xfer: slave %u:%u dout %p din %p bitlen %u\n",
+ slave->bus, slave->cs, dout, din, bitlen);
+
+ if (flags & SPI_XFER_BEGIN)
+ spi_cs_activate(slave);
+
+ /*
+ * handle data in 8-bit chunks
+ * TBD: 2byte xfer mode to be enabled
+ */
+ writel(((readl(&spireg->cfg) & ~ORIONSPI_XFERLEN_MASK) |
+ ORIONSPI_XFERLEN_1BYTE), &spireg->cfg);
+
+ while (bitlen > 4) {
+ debug("loopstart bitlen %d\n", bitlen);
+ tmpdout = 0;
+
+ /* Shift data so it's msb-justified */
+ if (dout)
+ tmpdout = *(u32 *) dout & 0x0ff;
+
+ writel(~ORIONSPI_SMEMRDIRQ, &spireg->irq_cause);
+ writel(tmpdout, &spireg->dout); /* Write the data out */
+ debug("*** spi_xfer: ... %08x written, bitlen %d\n",
+ tmpdout, bitlen);
+
+ /*
+ * Wait for SPI transmit to get out
+ * or time out (1 second = 1000 ms)
+ * The NE event must be read and cleared first
+ */
+ for (tm = 0, isread = 0; tm < ORIONSPI_TIMEOUT; ++tm) {
+ if (readl(&spireg->irq_cause) & ORIONSPI_SMEMRDIRQ) {
+ isread = 1;
+ tmpdin = readl(&spireg->din);
+ debug
+ ("spi_xfer: din %p..%08x read\n",
+ din, tmpdin);
+
+ if (din) {
+ *((u8 *) din) = (u8) tmpdin;
+ din += 1;
+ }
+ if (dout)
+ dout += 1;
+ bitlen -= 8;
+ }
+ if (isread)
+ break;
+ }
+ if (tm >= ORIONSPI_TIMEOUT)
+ printf("*** spi_xfer: Time out during SPI transfer\n");
+
+ debug("loopend bitlen %d\n", bitlen);
+ }
+
+ if (flags & SPI_XFER_END)
+ spi_cs_deactivate(slave);
+
+ return 0;
+}
--
1.7.10.4
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