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 cy...@ti.com
---
arch/arm/mach-davinci/include/mach/ti_ssp.h | 89 +
drivers/misc/Kconfig| 10 +
drivers/misc/Makefile |1 +
drivers/misc/ti_ssp.c | 492 +++
4 files changed, 592 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-davinci/include/mach/ti_ssp.h
create mode 100644 drivers/misc/ti_ssp.c
diff --git a/arch/arm/mach-davinci/include/mach/ti_ssp.h
b/arch/arm/mach-davinci/include/mach/ti_ssp.h
new file mode 100644
index 000..c98d0f2
--- /dev/null
+++ b/arch/arm/mach-davinci/include/mach/ti_ssp.h
@@ -0,0 +1,89 @@
+/*
+ * 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;
+ unsigned long iosel; /* see note below */
+ unsigned long config;
+ const 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 0x
+#define SSP_DATA 0x0001
+#define SSP_CLOCK 0x0002
+#define SSP_CHIPSEL0x0003
+#define SSP_OUT0x0004
+#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_LOW0
+#define SSP_DATA_HIGH BIT(1)
+#define SSP_DATA_LOW 0
+#define SSP_CS_HIGHBIT(2)
+#define SSP_CS_LOW 0
+#define SSP_OUT_MODE BIT(3)
+#define SSP_IN_MODE0
+#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__ */
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index b743312..a8b7ce3 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -390,6 +390,16 @@ config BMP085
To compile this driver as a module, choose M here: the
module will be called bmp085.
+config TI_SSP
+ tristate Sequencer Serial Port support
+ depends on ARCH_DAVINCI_TNETV107X
+ ---help---
+ Say Y here if you want support for the Sequencer Serial Port
+ in a Texas Instruments TNETV107X SoC.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ti_ssp.
+
source
