Patchwork [U-Boot,06/11] i2c: add FTI2C010 I2C controller support

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Submitter Kuo-Jung Su
Date March 29, 2013, 7:06 a.m.
Message ID <1364540788-13943-7-git-send-email-dantesu@gmail.com>
Download mbox | patch
Permalink /patch/232379/
State Superseded
Delegated to: Albert ARIBAUD
Headers show

Comments

Kuo-Jung Su - March 29, 2013, 7:06 a.m.
From: Kuo-Jung Su <dantesu@faraday-tech.com>

Faraday FTI2C010 is a multi-function I2C controller
which supports both master and slave mode.
This patch simplily implements the master mode only.

Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
---
 drivers/i2c/Makefile   |    1 +
 drivers/i2c/fti2c010.c |  360 ++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/i2c/fti2c010.h |   68 +++++++++
 3 files changed, 429 insertions(+)
 create mode 100644 drivers/i2c/fti2c010.c
 create mode 100644 drivers/i2c/fti2c010.h

--
1.7.9.5

Patch

diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 5dbdbe3..ed2b8c0 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -29,6 +29,7 @@  COBJS-$(CONFIG_BFIN_TWI_I2C) += bfin-twi_i2c.o
 COBJS-$(CONFIG_DRIVER_DAVINCI_I2C) += davinci_i2c.o
 COBJS-$(CONFIG_DW_I2C) += designware_i2c.o
 COBJS-$(CONFIG_FSL_I2C) += fsl_i2c.o
+COBJS-$(CONFIG_FTI2C010) += fti2c010.o
 COBJS-$(CONFIG_I2C_MVTWSI) += mvtwsi.o
 COBJS-$(CONFIG_I2C_MV) += mv_i2c.o
 COBJS-$(CONFIG_I2C_MXC) += mxc_i2c.o
diff --git a/drivers/i2c/fti2c010.c b/drivers/i2c/fti2c010.c
new file mode 100644
index 0000000..be5e02c
--- /dev/null
+++ b/drivers/i2c/fti2c010.c
@@ -0,0 +1,360 @@ 
+/*
+ * Faraday I2C Controller
+ *
+ * (C) Copyright 2010 Faraday Technology
+ * Dante Su <dantesu@faraday-tech.com>
+ *
+ * This file is released under the terms of GPL v2 and any later version.
+ * See the file COPYING in the root directory of the source tree for details.
+ */
+
+#include <common.h>
+#include <i2c.h>
+
+#include "fti2c010.h"
+
+#define I2C_RD        1
+#define I2C_WR        0
+
+struct fti2c010_chip {
+	uint32_t bus;
+	uint32_t speed;
+	uint32_t iobase;
+};
+
+#if defined(CONFIG_HARD_I2C)
+
+static struct fti2c010_chip fti2c010_info[] = {
+#ifdef CONFIG_I2C_MULTI_BUS
+# ifdef CONFIG_FTI2C010_BASE0
+	{
+		.bus    = 0,
+		.speed  = 0,
+		.iobase = CONFIG_FTI2C010_BASE0,
+	},
+# endif
+# ifdef CONFIG_FTI2C010_BASE1
+	{
+		.bus    = 1,
+		.speed  = 0,
+		.iobase = CONFIG_FTI2C010_BASE1,
+	},
+# endif
+# ifdef CONFIG_FTI2C010_BASE2
+	{
+		.bus    = 2,
+		.speed  = 0,
+		.iobase = CONFIG_FTI2C010_BASE2,
+	},
+# endif
+# ifdef CONFIG_FTI2C010_BASE3
+	{
+		.bus    = 3,
+		.speed  = 0,
+		.iobase = CONFIG_FTI2C010_BASE3,
+	},
+# endif
+#else    /* #ifdef CONFIG_I2C_MULTI_BUS */
+	{
+		.bus    = 0,
+		.speed  = 0,
+		.iobase = CONFIG_FTI2C010_BASE,
+	},
+#endif    /* #ifdef CONFIG_I2C_MULTI_BUS */
+};
+
+static struct fti2c010_chip *priv = fti2c010_info;
+
+/* Register access macros */
+#define I2C_REG32(priv, off)	\
+	*(volatile uint32_t *)((priv)->iobase + (off))
+
+static int fti2c010_wait(uint32_t mask)
+{
+	int ret = -1;
+	uint32_t stat, t;
+
+	for (t = get_timer(0); get_timer(t) < 100; ) {
+		stat = I2C_REG32(priv, REG_SR);
+		if ((stat & mask) == mask) {
+			ret = 0;
+			break;
+		}
+	}
+
+	return ret;
+}
+
+/*
+ * u-boot I2C API
+ */
+
+/*
+ * Initialization, must be called once on start up, may be called
+ * repeatedly to change the speed and slave addresses.
+ */
+void i2c_init(int speed, int slaveaddr)
+{
+	if (speed || priv->speed == 0)
+		i2c_set_bus_speed(speed);
+}
+
+/*
+ * Probe the given I2C chip address.  Returns 0 if a chip responded,
+ * not 0 on failure.
+ */
+int i2c_probe(uchar chip)
+{
+	int rc;
+
+	i2c_init(0, chip);
+
+	/* 1. Select slave device (7bits Address + 1bit R/W) */
+	I2C_REG32(priv, REG_DR) = (chip << 1) + I2C_WR;
+	I2C_REG32(priv, REG_CR) = CR_ENABLE | CR_TBEN | CR_START;
+	rc = fti2c010_wait(SR_DT);
+	if (rc)
+		return rc;
+
+	/* 2. Select device register */
+	I2C_REG32(priv, REG_DR) = 0;
+	I2C_REG32(priv, REG_CR) = CR_ENABLE | CR_TBEN;
+	rc = fti2c010_wait(SR_DT);
+
+	return rc;
+}
+
+/*
+ * Read/Write interface:
+ *   chip:    I2C chip address, range 0..127
+ *   addr:    Memory (register) address within the chip
+ *   alen:    Number of bytes to use for addr (typically 1, 2 for larger
+ *              memories, 0 for register type devices with only one
+ *              register)
+ *   buffer:  Where to read/write the data
+ *   len:     How many bytes to read/write
+ *
+ *   Returns: 0 on success, not 0 on failure
+ */
+int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
+{
+	int rc, pos;
+	uchar paddr[4];
+
+	i2c_init(0, chip);
+
+	paddr[0] = (addr >> 0)  & 0xFF;
+	paddr[1] = (addr >> 8)  & 0xFF;
+	paddr[2] = (addr >> 16) & 0xFF;
+	paddr[3] = (addr >> 24) & 0xFF;
+
+	/*
+	 * Phase A. Set register address
+	 */
+
+	/* A.1 Select slave device (7bits Address + 1bit R/W) */
+	I2C_REG32(priv, REG_DR) = (chip << 1) + I2C_WR;
+	I2C_REG32(priv, REG_CR) = CR_ENABLE | CR_TBEN | CR_START;
+	rc = fti2c010_wait(SR_DT);
+	if (rc)
+		return rc;
+
+	/* A.2 Select device register */
+	for (pos = 0; pos < alen; ++pos) {
+		uint32_t ctrl = CR_ENABLE | CR_TBEN;
+		I2C_REG32(priv, REG_DR) = paddr[pos];
+		I2C_REG32(priv, REG_CR) = ctrl;
+		rc = fti2c010_wait(SR_DT);
+		if (rc)
+			return rc;
+	}
+
+	/*
+	 * Phase B. Get register data
+	 */
+
+	/* B.1 Select slave device (7bits Address + 1bit R/W) */
+	I2C_REG32(priv, REG_DR) = (chip << 1) + I2C_RD;
+	I2C_REG32(priv, REG_CR) = CR_ENABLE | CR_TBEN | CR_START;
+	rc = fti2c010_wait(SR_DT);
+	if (rc)
+		return rc;
+
+	/* B.2 Get register data */
+	for (pos = 0; pos < len; ++pos) {
+		uint32_t ctrl = CR_ENABLE | CR_TBEN;
+		uint32_t stat = SR_DR;
+		if (pos == len - 1) {
+			ctrl |= CR_NAK | CR_STOP;
+			stat |= SR_ACK;
+		}
+		I2C_REG32(priv, REG_CR) = ctrl;
+		rc = fti2c010_wait(stat);
+		if (rc)
+			break;
+		buf[pos] = (uchar)(I2C_REG32(priv, REG_DR) & 0xFF);
+	}
+
+	return rc;
+}
+
+/*
+ * Read/Write interface:
+ *   chip:    I2C chip address, range 0..127
+ *   addr:    Memory (register) address within the chip
+ *   alen:    Number of bytes to use for addr (typically 1, 2 for larger
+ *              memories, 0 for register type devices with only one
+ *              register)
+ *   buffer:  Where to read/write the data
+ *   len:     How many bytes to read/write
+ *
+ *   Returns: 0 on success, not 0 on failure
+ */
+int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
+{
+	int rc, pos;
+	uchar paddr[4];
+
+	i2c_init(0, chip);
+
+	paddr[0] = (addr >> 0)  & 0xFF;
+	paddr[1] = (addr >> 8)  & 0xFF;
+	paddr[2] = (addr >> 16) & 0xFF;
+	paddr[3] = (addr >> 24) & 0xFF;
+
+	/*
+	 * Phase A. Set register address
+	 */
+
+	/* A.1 Select slave device (7bits Address + 1bit R/W) */
+	I2C_REG32(priv, REG_DR) = (chip << 1) + I2C_WR;
+	I2C_REG32(priv, REG_CR) = CR_ENABLE | CR_TBEN | CR_START;
+	rc = fti2c010_wait(SR_DT);
+	if (rc)
+		return rc;
+
+	/* A.2 Select device register */
+	for (pos = 0; pos < alen; ++pos) {
+		uint32_t ctrl = CR_ENABLE | CR_TBEN;
+		I2C_REG32(priv, REG_DR) = paddr[pos];
+		I2C_REG32(priv, REG_CR) = ctrl;
+		rc = fti2c010_wait(SR_DT);
+		if (rc)
+			return rc;
+	}
+
+	/*
+	 * Phase B. Set register data
+	 */
+
+	for (pos = 0; pos < len; ++pos) {
+		uint32_t ctrl = CR_ENABLE | CR_TBEN;
+		if (pos == len - 1)
+			ctrl |= CR_STOP;
+		I2C_REG32(priv, REG_DR) = buf[pos];
+		I2C_REG32(priv, REG_CR) = ctrl;
+		rc = fti2c010_wait(SR_DT);
+		if (rc)
+			break;
+	}
+
+	return rc;
+}
+
+/*
+ * Functions for setting the current I2C bus and its speed
+ */
+#ifdef CONFIG_I2C_MULTI_BUS
+
+/*
+ * i2c_set_bus_num:
+ *
+ *  Change the active I2C bus.  Subsequent read/write calls will
+ *  go to this one.
+ *
+ *    bus - bus index, zero based
+ *
+ *    Returns: 0 on success, not 0 on failure
+ *
+ */
+int i2c_set_bus_num(unsigned int bus)
+{
+	if (bus >= sizeof(fti2c010_info) / sizeof(fti2c010_info[0]))
+		return -1;
+	priv = fti2c010_info + bus;
+	i2c_init(5000, 0);
+	return 0;
+}
+
+/*
+ * i2c_get_bus_num:
+ *
+ *  Returns index of currently active I2C bus.  Zero-based.
+ */
+
+unsigned int i2c_get_bus_num(void)
+{
+	return priv->bus;
+}
+
+#endif    /* #ifdef CONFIG_I2C_MULTI_BUS */
+
+/*
+ * i2c_set_bus_speed:
+ *
+ *  Change the speed of the active I2C bus
+ *
+ *    speed - bus speed in Hz
+ *
+ *    Returns: 0 on success, not 0 on failure
+ *
+ */
+int i2c_set_bus_speed(unsigned int speed)
+{
+#ifdef CONFIG_FTI2C010_SCLK
+	unsigned long apb = CONFIG_FTI2C010_SCLK;
+#else
+	unsigned long apb = clk_get_rate("I2C");
+#endif
+	unsigned long div = 0x640;
+	unsigned long gsr = 0;
+	unsigned long tsr = 0x20;
+	unsigned long t;
+
+	I2C_REG32(priv, REG_CR) = 1;
+	t = get_timer(0);
+	while (get_timer(t) < 100) {
+		if (I2C_REG32(priv, REG_CR) & 1)
+			continue;
+		break;
+	}
+
+	/* SCLout = PCLK/(2*(COUNT + 2) + GSR) */
+	priv->speed = apb / (2 * (div + 2) + gsr);
+
+	if (speed > 0) {
+		for (div = 0; div < 0x1000000; ++div) {
+			priv->speed = apb / (2 * (div + 2) + gsr);
+			if (priv->speed < speed)
+				break;
+		}
+	}
+
+	I2C_REG32(priv, REG_TGSR) = (gsr << 10) | tsr;
+	I2C_REG32(priv, REG_CDR)  = div;
+
+	return 0;
+}
+
+/*
+ * i2c_get_bus_speed:
+ *
+ *  Returns speed of currently active I2C bus in Hz
+ */
+
+unsigned int i2c_get_bus_speed(void)
+{
+	return priv->speed;
+}
+
+#endif /* CONFIG_HARD_I2C */
diff --git a/drivers/i2c/fti2c010.h b/drivers/i2c/fti2c010.h
new file mode 100644
index 0000000..704b3a2
--- /dev/null
+++ b/drivers/i2c/fti2c010.h
@@ -0,0 +1,68 @@ 
+/*
+ * Faraday I2C Controller
+ *
+ * (C) Copyright 2010 Faraday Technology
+ * Dante Su <dantesu@faraday-tech.com>
+ *
+ * This file is released under the terms of GPL v2 and any later version.
+ * See the file COPYING in the root directory of the source tree for details.
+ */
+
+#ifndef __FTI2C010_H
+#define __FTI2C010_H
+
+/*
+ * FTI2C010 registers
+ */
+#define REG_CR              0x00    /* control register */
+#define REG_SR              0x04    /* status register */
+#define REG_CDR             0x08    /* clock division register */
+#define REG_DR              0x0C    /* data register */
+#define REG_SAR             0x10    /* slave address register */
+#define REG_TGSR            0x14    /* time & glitch suppression register */
+#define REG_BMR             0x18    /* bus monitor register */
+#define REG_REVR            0x30    /* revision register */
+
+/*
+ * REG_CTRL
+ */
+#define CR_ALIEN      0x2000  /* Arbitration lose */
+#define CR_SAMIEN     0x1000  /* slave address match */
+#define CR_STOPIEN    0x800   /* stop condition */
+#define CR_BERRIEN    0x400   /* non ACK response */
+#define CR_DRIEN      0x200   /* data receive */
+#define CR_DTIEN      0x100   /* data transmit */
+#define CR_TBEN       0x80    /* transfer byte enable */
+#define CR_NAK        0x40    /* with this bit set, fti2c010 will not drive ACK signal */
+#define CR_STOP       0x20    /* stop */
+#define CR_START      0x10    /* start */
+#define CR_GCEN       0x8     /* general call */
+#define CR_SCLEN      0x4     /* enable clock */
+#define CR_I2CEN      0x2     /* enable I2C */
+#define CR_I2CRST     0x1     /* reset I2C */
+#define CR_ENABLE	\
+	(CR_ALIEN | CR_SAMIEN | CR_STOPIEN | CR_BERRIEN \
+	| CR_DRIEN | CR_DTIEN | CR_SCLEN | CR_I2CEN)
+
+/*
+ * REG_STAT
+ */
+#define SR_CLRAL      0x400
+#define SR_CLRGC      0x200
+#define SR_CLRSAM     0x100
+#define SR_CLRSTOP    0x80
+#define SR_CLRBERR    0x40
+#define SR_DR         0x20     /* DR received one new data byte */
+#define SR_DT         0x10     /* DR trandmitted one new data byte */
+#define SR_BB         0x8
+#define SR_BUSY       0x4
+#define SR_ACK        0x2
+#define SR_RW         0x1
+
+/*
+ * REG_BMR
+ */
+#define BMR_SCL         0x2
+#define BMR_SDA         0x1
+
+#endif /* EOF */