mfd: add driver for sequencer serial port

TI's sequencer serial port (TI-SSP) is a jack-of-all-trades type of serial port
device.  It has a built-in programmable execution engine that can be programmed
to operate as almost any serial bus (I2C, SPI, EasyScale, and others).

This patch adds a driver for this controller device.  The driver does not
expose a user-land interface.  Protocol drivers built on top of this layer are
expected to remain in-kernel.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/include/linux/mfd/ti_ssp.h b/include/linux/mfd/ti_ssp.h
new file mode 100644
index 000000000000..021fe0912435
--- /dev/null
+++ b/include/linux/mfd/ti_ssp.h
@@ -0,0 +1,87 @@
+/*
+ * Sequencer Serial Port (SSP) driver for Texas Instruments' SoCs
+ *
+ * Copyright (C) 2010 Texas Instruments Inc
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __TI_SSP_H__
+#define __TI_SSP_H__
+
+struct ti_ssp_dev_data {
+        const char      *dev_name;
+        void            *pdata;
+        size_t          pdata_size;
+};
+
+struct ti_ssp_data {
+        unsigned long           out_clock;
+        struct ti_ssp_dev_data  dev_data[2];
+};
+
+/*
+ * Sequencer port IO pin configuration bits.  These do not correlate 1-1 with
+ * the hardware.  The iosel field in the port data combines iosel1 and iosel2,
+ * and is therefore not a direct map to register space.  It is best to use the
+ * macros below to construct iosel values.
+ *
+ * least significant 16 bits --> iosel1
+ * most significant 16 bits  --> iosel2
+ */
+
+#define SSP_IN                  0x0000
+#define SSP_DATA                0x0001
+#define SSP_CLOCK               0x0002
+#define SSP_CHIPSEL             0x0003
+#define SSP_OUT                 0x0004
+#define SSP_PIN_SEL(pin, v)     ((v) << ((pin) * 3))
+#define SSP_PIN_MASK(pin)       SSP_PIN_SEL(pin, 0x7)
+#define SSP_INPUT_SEL(pin)      ((pin) << 16)
+
+/* Sequencer port config bits */
+#define SSP_EARLY_DIN           BIT(8)
+#define SSP_DELAY_DOUT          BIT(9)
+
+/* Sequence map definitions */
+#define SSP_CLK_HIGH            BIT(0)
+#define SSP_CLK_LOW             0
+#define SSP_DATA_HIGH           BIT(1)
+#define SSP_DATA_LOW            0
+#define SSP_CS_HIGH             BIT(2)
+#define SSP_CS_LOW              0
+#define SSP_OUT_MODE            BIT(3)
+#define SSP_IN_MODE             0
+#define SSP_DATA_REG            BIT(4)
+#define SSP_ADDR_REG            0
+
+#define SSP_OPCODE_DIRECT       ((0x0) << 5)
+#define SSP_OPCODE_TOGGLE       ((0x1) << 5)
+#define SSP_OPCODE_SHIFT        ((0x2) << 5)
+#define SSP_OPCODE_BRANCH0      ((0x4) << 5)
+#define SSP_OPCODE_BRANCH1      ((0x5) << 5)
+#define SSP_OPCODE_BRANCH       ((0x6) << 5)
+#define SSP_OPCODE_STOP         ((0x7) << 5)
+#define SSP_BRANCH(addr)        ((addr) << 8)
+#define SSP_COUNT(cycles)       ((cycles) << 8)
+
+int ti_ssp_raw_read(struct device *dev);
+int ti_ssp_raw_write(struct device *dev, u32 val);
+int ti_ssp_load(struct device *dev, int offs, u32* prog, int len);
+int ti_ssp_run(struct device *dev, u32 pc, u32 input, u32 *output);
+int ti_ssp_set_mode(struct device *dev, int mode);
+int ti_ssp_set_iosel(struct device *dev, u32 iosel);
+
+#endif /* __TI_SSP_H__ */