mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-12 16:19:53 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34687 3c298f89-4303-0410-b956-a3cf2f4a3e73
1048 lines
28 KiB
Diff
1048 lines
28 KiB
Diff
From f2ac37c0a5297ca4663da9e4328c77736504b484 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sun, 20 May 2012 00:42:39 +0200
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Subject: [PATCH 113/123] I2C: MIPS: lantiq: add FALC-ON i2c bus master
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This patch adds the driver needed to make the I2C bus work on FALC-ON SoCs.
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Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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drivers/i2c/busses/Kconfig | 10 +
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drivers/i2c/busses/Makefile | 1 +
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drivers/i2c/busses/i2c-lantiq.c | 747 +++++++++++++++++++++++++++++++++++++++
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drivers/i2c/busses/i2c-lantiq.h | 234 ++++++++++++
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4 files changed, 992 insertions(+)
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create mode 100644 drivers/i2c/busses/i2c-lantiq.c
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create mode 100644 drivers/i2c/busses/i2c-lantiq.h
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diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
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index e9df461..e03f821 100644
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--- a/drivers/i2c/busses/Kconfig
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+++ b/drivers/i2c/busses/Kconfig
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@@ -460,6 +460,16 @@ config I2C_IOP3XX
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This driver can also be built as a module. If so, the module
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will be called i2c-iop3xx.
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+config I2C_LANTIQ
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+ tristate "Lantiq I2C interface"
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+ depends on LANTIQ && SOC_FALCON
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+ help
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+ If you say yes to this option, support will be included for the
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+ Lantiq I2C core.
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+
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+ This driver can also be built as a module. If so, the module
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+ will be called i2c-lantiq.
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+
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config I2C_MPC
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tristate "MPC107/824x/85xx/512x/52xx/83xx/86xx"
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depends on PPC
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diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
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index 395b516..74a789a 100644
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--- a/drivers/i2c/busses/Makefile
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+++ b/drivers/i2c/busses/Makefile
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@@ -45,6 +45,7 @@ obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o
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obj-$(CONFIG_I2C_IMX) += i2c-imx.o
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obj-$(CONFIG_I2C_INTEL_MID) += i2c-intel-mid.o
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obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o
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+obj-$(CONFIG_I2C_LANTIQ) += i2c-lantiq.o
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obj-$(CONFIG_I2C_MPC) += i2c-mpc.o
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obj-$(CONFIG_I2C_MV64XXX) += i2c-mv64xxx.o
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obj-$(CONFIG_I2C_MXS) += i2c-mxs.o
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diff --git a/drivers/i2c/busses/i2c-lantiq.c b/drivers/i2c/busses/i2c-lantiq.c
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new file mode 100644
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index 0000000..9a5f58b
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--- /dev/null
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+++ b/drivers/i2c/busses/i2c-lantiq.c
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@@ -0,0 +1,747 @@
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+
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+/*
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+ * Lantiq I2C bus adapter
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+ *
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+ * Parts based on i2c-designware.c and other i2c drivers from Linux 2.6.33
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/delay.h>
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+#include <linux/slab.h> /* for kzalloc, kfree */
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+#include <linux/i2c.h>
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+#include <linux/errno.h>
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+#include <linux/completion.h>
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+#include <linux/interrupt.h>
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+#include <linux/platform_device.h>
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+#include <linux/io.h>
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+#include <linux/of_irq.h>
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+#include <linux/of_i2c.h>
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+
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+#include <lantiq_soc.h>
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+#include "i2c-lantiq.h"
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+
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+/*
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+ * CURRENT ISSUES:
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+ * - no high speed support
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+ * - ten bit mode is not tested (no slave devices)
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+ */
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+
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+/* access macros */
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+#define i2c_r32(reg) \
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+ __raw_readl(&(priv->membase)->reg)
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+#define i2c_w32(val, reg) \
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+ __raw_writel(val, &(priv->membase)->reg)
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+#define i2c_w32_mask(clear, set, reg) \
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+ i2c_w32((i2c_r32(reg) & ~(clear)) | (set), reg)
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+
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+#define DRV_NAME "i2c-lantiq"
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+#define DRV_VERSION "1.00"
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+
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+#define LTQ_I2C_BUSY_TIMEOUT 20 /* ms */
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+
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+#ifdef DEBUG
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+#define LTQ_I2C_XFER_TIMEOUT (25*HZ)
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+#else
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+#define LTQ_I2C_XFER_TIMEOUT HZ
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+#endif
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+
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+#define LTQ_I2C_IMSC_DEFAULT_MASK (I2C_IMSC_I2C_P_INT_EN | \
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+ I2C_IMSC_I2C_ERR_INT_EN)
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+
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+#define LTQ_I2C_ARB_LOST (1 << 0)
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+#define LTQ_I2C_NACK (1 << 1)
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+#define LTQ_I2C_RX_UFL (1 << 2)
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+#define LTQ_I2C_RX_OFL (1 << 3)
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+#define LTQ_I2C_TX_UFL (1 << 4)
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+#define LTQ_I2C_TX_OFL (1 << 5)
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+
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+struct ltq_i2c {
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+ struct mutex mutex;
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+
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+
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+ /* active clock settings */
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+ unsigned int input_clock; /* clock input for i2c hardware block */
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+ unsigned int i2c_clock; /* approximated bus clock in kHz */
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+
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+ struct clk *clk_gate;
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+ struct clk *clk_input;
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+
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+
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+ /* resources (memory and interrupts) */
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+ int irq_lb; /* last burst irq */
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+
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+ struct lantiq_reg_i2c __iomem *membase; /* base of mapped registers */
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+
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+ struct i2c_adapter adap;
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+ struct device *dev;
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+
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+ struct completion cmd_complete;
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+
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+
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+ /* message transfer data */
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+ struct i2c_msg *current_msg; /* current message */
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+ int msgs_num; /* number of messages to handle */
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+ u8 *msg_buf; /* current buffer */
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+ u32 msg_buf_len; /* remaining length of current buffer */
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+ int msg_err; /* error status of the current transfer */
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+
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+
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+ /* master status codes */
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+ enum {
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+ STATUS_IDLE,
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+ STATUS_ADDR, /* address phase */
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+ STATUS_WRITE,
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+ STATUS_READ,
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+ STATUS_READ_END,
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+ STATUS_STOP
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+ } status;
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+};
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+
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+static irqreturn_t ltq_i2c_isr(int irq, void *dev_id);
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+
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+static inline void enable_burst_irq(struct ltq_i2c *priv)
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+{
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+ i2c_w32_mask(0, I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, imsc);
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+}
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+static inline void disable_burst_irq(struct ltq_i2c *priv)
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+{
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+ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, 0, imsc);
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+}
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+
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+static void prepare_msg_send_addr(struct ltq_i2c *priv)
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+{
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+ struct i2c_msg *msg = priv->current_msg;
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+ int rd = !!(msg->flags & I2C_M_RD); /* extends to 0 or 1 */
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+ u16 addr = msg->addr;
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+
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+ /* new i2c_msg */
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+ priv->msg_buf = msg->buf;
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+ priv->msg_buf_len = msg->len;
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+ if (rd)
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+ priv->status = STATUS_READ;
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+ else
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+ priv->status = STATUS_WRITE;
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+
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+ /* send slave address */
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+ if (msg->flags & I2C_M_TEN) {
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+ i2c_w32(0xf0 | ((addr & 0x300) >> 7) | rd, txd);
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+ i2c_w32(addr & 0xff, txd);
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+ } else {
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+ i2c_w32((addr & 0x7f) << 1 | rd, txd);
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+ }
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+}
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+
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+static void ltq_i2c_set_tx_len(struct ltq_i2c *priv)
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+{
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+ struct i2c_msg *msg = priv->current_msg;
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+ int len = (msg->flags & I2C_M_TEN) ? 2 : 1;
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+
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+ pr_debug("set_tx_len %cX\n", (msg->flags & I2C_M_RD) ? 'R' : 'T');
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+
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+ priv->status = STATUS_ADDR;
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+
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+ if (!(msg->flags & I2C_M_RD))
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+ len += msg->len;
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+ else
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+ /* set maximum received packet size (before rx int!) */
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+ i2c_w32(msg->len, mrps_ctrl);
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+ i2c_w32(len, tps_ctrl);
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+ enable_burst_irq(priv);
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+}
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+
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+static int ltq_i2c_hw_set_clock(struct i2c_adapter *adap)
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+{
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+ struct ltq_i2c *priv = i2c_get_adapdata(adap);
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+ unsigned int input_clock = clk_get_rate(priv->clk_input);
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+ u32 dec, inc = 1;
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+
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+ /* clock changed? */
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+ if (priv->input_clock == input_clock)
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+ return 0;
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+
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+ /*
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+ * this formula is only an approximation, found by the recommended
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+ * values in the "I2C Architecture Specification 1.7.1"
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+ */
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+ dec = input_clock / (priv->i2c_clock * 2);
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+ if (dec <= 6)
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+ return -ENXIO;
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+
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+ i2c_w32(0, fdiv_high_cfg);
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+ i2c_w32((inc << I2C_FDIV_CFG_INC_OFFSET) |
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+ (dec << I2C_FDIV_CFG_DEC_OFFSET),
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+ fdiv_cfg);
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+
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+ dev_info(priv->dev, "setup clocks (in %d kHz, bus %d kHz, dec=%d)\n",
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+ input_clock, priv->i2c_clock, dec);
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+
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+ priv->input_clock = input_clock;
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+ return 0;
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+}
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+
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+static int ltq_i2c_hw_init(struct i2c_adapter *adap)
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+{
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+ int ret = 0;
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+ struct ltq_i2c *priv = i2c_get_adapdata(adap);
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+
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+ /* disable bus */
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+ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
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+
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+#ifndef DEBUG
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+ /* set normal operation clock divider */
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+ i2c_w32(1 << I2C_CLC_RMC_OFFSET, clc);
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+#else
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+ /* for debugging a higher divider value! */
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+ i2c_w32(0xF0 << I2C_CLC_RMC_OFFSET, clc);
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+#endif
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+
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+ /* setup clock */
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+ ret = ltq_i2c_hw_set_clock(adap);
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+ if (ret != 0) {
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+ dev_warn(priv->dev, "invalid clock settings\n");
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+ return ret;
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+ }
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+
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+ /* configure fifo */
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+ i2c_w32(I2C_FIFO_CFG_TXFC | /* tx fifo as flow controller */
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+ I2C_FIFO_CFG_RXFC | /* rx fifo as flow controller */
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+ I2C_FIFO_CFG_TXFA_TXFA2 | /* tx fifo 4-byte aligned */
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+ I2C_FIFO_CFG_RXFA_RXFA2 | /* rx fifo 4-byte aligned */
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+ I2C_FIFO_CFG_TXBS_TXBS0 | /* tx fifo burst size is 1 word */
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+ I2C_FIFO_CFG_RXBS_RXBS0, /* rx fifo burst size is 1 word */
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+ fifo_cfg);
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+
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+ /* configure address */
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+ i2c_w32(I2C_ADDR_CFG_SOPE_EN | /* generate stop when no more data in
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+ the fifo */
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+ I2C_ADDR_CFG_SONA_EN | /* generate stop when NA received */
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+ I2C_ADDR_CFG_MnS_EN | /* we are master device */
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+ 0, /* our slave address (not used!) */
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+ addr_cfg);
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+
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+ /* enable bus */
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+ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl);
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+
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+ return 0;
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+}
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+
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+static int ltq_i2c_wait_bus_not_busy(struct ltq_i2c *priv)
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+{
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+ unsigned long timeout;
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+
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+ timeout = jiffies + msecs_to_jiffies(LTQ_I2C_BUSY_TIMEOUT);
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+
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+ do {
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+ u32 stat = i2c_r32(bus_stat);
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+
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+ if ((stat & I2C_BUS_STAT_BS_MASK) == I2C_BUS_STAT_BS_FREE)
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+ return 0;
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+
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+ cond_resched();
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+ } while (!time_after_eq(jiffies, timeout));
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+
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+ dev_err(priv->dev, "timeout waiting for bus ready\n");
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+ return -ETIMEDOUT;
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+}
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+
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+static void ltq_i2c_tx(struct ltq_i2c *priv, int last)
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+{
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+ if (priv->msg_buf_len && priv->msg_buf) {
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+ i2c_w32(*priv->msg_buf, txd);
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+
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+ if (--priv->msg_buf_len)
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+ priv->msg_buf++;
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+ else
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+ priv->msg_buf = NULL;
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+ } else {
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+ last = 1;
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+ }
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+
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+ if (last)
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+ disable_burst_irq(priv);
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+}
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+
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+static void ltq_i2c_rx(struct ltq_i2c *priv, int last)
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+{
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+ u32 fifo_stat, timeout;
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+ if (priv->msg_buf_len && priv->msg_buf) {
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+ timeout = 5000000;
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+ do {
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+ fifo_stat = i2c_r32(ffs_stat);
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+ } while (!fifo_stat && --timeout);
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+ if (!timeout) {
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+ last = 1;
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+ pr_debug("\nrx timeout\n");
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+ goto err;
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+ }
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+ while (fifo_stat) {
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+ *priv->msg_buf = i2c_r32(rxd);
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+ if (--priv->msg_buf_len) {
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+ priv->msg_buf++;
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+ } else {
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+ priv->msg_buf = NULL;
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+ last = 1;
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+ break;
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+ }
|
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+ /*
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+ * do not read more than burst size, otherwise no "last
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+ * burst" is generated and the transaction is blocked!
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+ */
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+ fifo_stat = 0;
|
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+ }
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+ } else {
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+ last = 1;
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+ }
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+err:
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+ if (last) {
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+ disable_burst_irq(priv);
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+
|
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+ if (priv->status == STATUS_READ_END) {
|
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+ /*
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+ * do the STATUS_STOP and complete() here, as sometimes
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+ * the tx_end is already seen before this is finished
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+ */
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+ priv->status = STATUS_STOP;
|
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+ complete(&priv->cmd_complete);
|
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+ } else {
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+ i2c_w32(I2C_ENDD_CTRL_SETEND, endd_ctrl);
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+ priv->status = STATUS_READ_END;
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+ }
|
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+ }
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+}
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+
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+static void ltq_i2c_xfer_init(struct ltq_i2c *priv)
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+{
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+ /* enable interrupts */
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+ i2c_w32(LTQ_I2C_IMSC_DEFAULT_MASK, imsc);
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+
|
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+ /* trigger transfer of first msg */
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+ ltq_i2c_set_tx_len(priv);
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+}
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+
|
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+static void dump_msgs(struct i2c_msg msgs[], int num, int rx)
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+{
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+#if defined(DEBUG)
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+ int i, j;
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+ pr_debug("Messages %d %s\n", num, rx ? "out" : "in");
|
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+ for (i = 0; i < num; i++) {
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+ pr_debug("%2d %cX Msg(%d) addr=0x%X: ", i,
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+ (msgs[i].flags & I2C_M_RD) ? 'R' : 'T',
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+ msgs[i].len, msgs[i].addr);
|
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+ if (!(msgs[i].flags & I2C_M_RD) || rx) {
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+ for (j = 0; j < msgs[i].len; j++)
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+ pr_debug("%02X ", msgs[i].buf[j]);
|
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+ }
|
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+ pr_debug("\n");
|
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+ }
|
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+#endif
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+}
|
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+
|
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+static void ltq_i2c_release_bus(struct ltq_i2c *priv)
|
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+{
|
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+ if ((i2c_r32(bus_stat) & I2C_BUS_STAT_BS_MASK) == I2C_BUS_STAT_BS_BM)
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+ i2c_w32(I2C_ENDD_CTRL_SETEND, endd_ctrl);
|
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+}
|
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+
|
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+static int ltq_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
|
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+ int num)
|
|
+{
|
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+ struct ltq_i2c *priv = i2c_get_adapdata(adap);
|
|
+ int ret;
|
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+
|
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+ dev_dbg(priv->dev, "xfer %u messages\n", num);
|
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+ dump_msgs(msgs, num, 0);
|
|
+
|
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+ mutex_lock(&priv->mutex);
|
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+
|
|
+ INIT_COMPLETION(priv->cmd_complete);
|
|
+ priv->current_msg = msgs;
|
|
+ priv->msgs_num = num;
|
|
+ priv->msg_err = 0;
|
|
+ priv->status = STATUS_IDLE;
|
|
+
|
|
+ /* wait for the bus to become ready */
|
|
+ ret = ltq_i2c_wait_bus_not_busy(priv);
|
|
+ if (ret)
|
|
+ goto done;
|
|
+
|
|
+ while (priv->msgs_num) {
|
|
+ /* start the transfers */
|
|
+ ltq_i2c_xfer_init(priv);
|
|
+
|
|
+ /* wait for transfers to complete */
|
|
+ ret = wait_for_completion_interruptible_timeout(
|
|
+ &priv->cmd_complete, LTQ_I2C_XFER_TIMEOUT);
|
|
+ if (ret == 0) {
|
|
+ dev_err(priv->dev, "controller timed out\n");
|
|
+ ltq_i2c_hw_init(adap);
|
|
+ ret = -ETIMEDOUT;
|
|
+ goto done;
|
|
+ } else if (ret < 0)
|
|
+ goto done;
|
|
+
|
|
+ if (priv->msg_err) {
|
|
+ if (priv->msg_err & LTQ_I2C_NACK)
|
|
+ ret = -ENXIO;
|
|
+ else
|
|
+ ret = -EREMOTEIO;
|
|
+ goto done;
|
|
+ }
|
|
+ if (--priv->msgs_num)
|
|
+ priv->current_msg++;
|
|
+ }
|
|
+ /* no error? */
|
|
+ ret = num;
|
|
+
|
|
+done:
|
|
+ ltq_i2c_release_bus(priv);
|
|
+
|
|
+ mutex_unlock(&priv->mutex);
|
|
+
|
|
+ if (ret >= 0)
|
|
+ dump_msgs(msgs, num, 1);
|
|
+
|
|
+ pr_debug("XFER ret %d\n", ret);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static irqreturn_t ltq_i2c_isr_burst(int irq, void *dev_id)
|
|
+{
|
|
+ struct ltq_i2c *priv = dev_id;
|
|
+ struct i2c_msg *msg = priv->current_msg;
|
|
+ int last = (irq == priv->irq_lb);
|
|
+
|
|
+ if (last)
|
|
+ pr_debug("LB ");
|
|
+ else
|
|
+ pr_debug("B ");
|
|
+
|
|
+ if (msg->flags & I2C_M_RD) {
|
|
+ switch (priv->status) {
|
|
+ case STATUS_ADDR:
|
|
+ pr_debug("X");
|
|
+ prepare_msg_send_addr(priv);
|
|
+ disable_burst_irq(priv);
|
|
+ break;
|
|
+ case STATUS_READ:
|
|
+ case STATUS_READ_END:
|
|
+ pr_debug("R");
|
|
+ ltq_i2c_rx(priv, last);
|
|
+ break;
|
|
+ default:
|
|
+ disable_burst_irq(priv);
|
|
+ pr_warn("Status R %d\n", priv->status);
|
|
+ break;
|
|
+ }
|
|
+ } else {
|
|
+ switch (priv->status) {
|
|
+ case STATUS_ADDR:
|
|
+ pr_debug("x");
|
|
+ prepare_msg_send_addr(priv);
|
|
+ break;
|
|
+ case STATUS_WRITE:
|
|
+ pr_debug("w");
|
|
+ ltq_i2c_tx(priv, last);
|
|
+ break;
|
|
+ default:
|
|
+ disable_burst_irq(priv);
|
|
+ pr_warn("Status W %d\n", priv->status);
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ i2c_w32(I2C_ICR_BREQ_INT_CLR | I2C_ICR_LBREQ_INT_CLR, icr);
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+static void ltq_i2c_isr_prot(struct ltq_i2c *priv)
|
|
+{
|
|
+ u32 i_pro = i2c_r32(p_irqss);
|
|
+
|
|
+ pr_debug("i2c-p");
|
|
+
|
|
+ /* not acknowledge */
|
|
+ if (i_pro & I2C_P_IRQSS_NACK) {
|
|
+ priv->msg_err |= LTQ_I2C_NACK;
|
|
+ pr_debug(" nack");
|
|
+ }
|
|
+
|
|
+ /* arbitration lost */
|
|
+ if (i_pro & I2C_P_IRQSS_AL) {
|
|
+ priv->msg_err |= LTQ_I2C_ARB_LOST;
|
|
+ pr_debug(" arb-lost");
|
|
+ }
|
|
+ /* tx -> rx switch */
|
|
+ if (i_pro & I2C_P_IRQSS_RX)
|
|
+ pr_debug(" rx");
|
|
+
|
|
+ /* tx end */
|
|
+ if (i_pro & I2C_P_IRQSS_TX_END)
|
|
+ pr_debug(" txend");
|
|
+ pr_debug("\n");
|
|
+
|
|
+ if (!priv->msg_err) {
|
|
+ /* tx -> rx switch */
|
|
+ if (i_pro & I2C_P_IRQSS_RX) {
|
|
+ priv->status = STATUS_READ;
|
|
+ enable_burst_irq(priv);
|
|
+ }
|
|
+ if (i_pro & I2C_P_IRQSS_TX_END) {
|
|
+ if (priv->status == STATUS_READ)
|
|
+ priv->status = STATUS_READ_END;
|
|
+ else {
|
|
+ disable_burst_irq(priv);
|
|
+ priv->status = STATUS_STOP;
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+
|
|
+ i2c_w32(i_pro, p_irqsc);
|
|
+}
|
|
+
|
|
+static irqreturn_t ltq_i2c_isr(int irq, void *dev_id)
|
|
+{
|
|
+ u32 i_raw, i_err = 0;
|
|
+ struct ltq_i2c *priv = dev_id;
|
|
+
|
|
+ i_raw = i2c_r32(mis);
|
|
+ pr_debug("i_raw 0x%08X\n", i_raw);
|
|
+
|
|
+ /* error interrupt */
|
|
+ if (i_raw & I2C_RIS_I2C_ERR_INT_INTOCC) {
|
|
+ i_err = i2c_r32(err_irqss);
|
|
+ pr_debug("i_err 0x%08X bus_stat 0x%04X\n",
|
|
+ i_err, i2c_r32(bus_stat));
|
|
+
|
|
+ /* tx fifo overflow (8) */
|
|
+ if (i_err & I2C_ERR_IRQSS_TXF_OFL)
|
|
+ priv->msg_err |= LTQ_I2C_TX_OFL;
|
|
+
|
|
+ /* tx fifo underflow (4) */
|
|
+ if (i_err & I2C_ERR_IRQSS_TXF_UFL)
|
|
+ priv->msg_err |= LTQ_I2C_TX_UFL;
|
|
+
|
|
+ /* rx fifo overflow (2) */
|
|
+ if (i_err & I2C_ERR_IRQSS_RXF_OFL)
|
|
+ priv->msg_err |= LTQ_I2C_RX_OFL;
|
|
+
|
|
+ /* rx fifo underflow (1) */
|
|
+ if (i_err & I2C_ERR_IRQSS_RXF_UFL)
|
|
+ priv->msg_err |= LTQ_I2C_RX_UFL;
|
|
+
|
|
+ i2c_w32(i_err, err_irqsc);
|
|
+ }
|
|
+
|
|
+ /* protocol interrupt */
|
|
+ if (i_raw & I2C_RIS_I2C_P_INT_INTOCC)
|
|
+ ltq_i2c_isr_prot(priv);
|
|
+
|
|
+ if ((priv->msg_err) || (priv->status == STATUS_STOP))
|
|
+ complete(&priv->cmd_complete);
|
|
+
|
|
+ return IRQ_HANDLED;
|
|
+}
|
|
+
|
|
+static u32 ltq_i2c_functionality(struct i2c_adapter *adap)
|
|
+{
|
|
+ return I2C_FUNC_I2C |
|
|
+ I2C_FUNC_10BIT_ADDR |
|
|
+ I2C_FUNC_SMBUS_EMUL;
|
|
+}
|
|
+
|
|
+static struct i2c_algorithm ltq_i2c_algorithm = {
|
|
+ .master_xfer = ltq_i2c_xfer,
|
|
+ .functionality = ltq_i2c_functionality,
|
|
+};
|
|
+
|
|
+static int __devinit ltq_i2c_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct device_node *node = pdev->dev.of_node;
|
|
+ struct ltq_i2c *priv;
|
|
+ struct i2c_adapter *adap;
|
|
+ struct resource *mmres, irqres[4];
|
|
+ int ret = 0;
|
|
+
|
|
+ dev_dbg(&pdev->dev, "probing\n");
|
|
+
|
|
+ mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ ret = of_irq_to_resource_table(node, irqres, 4);
|
|
+ if (!mmres || (ret != 4)) {
|
|
+ dev_err(&pdev->dev, "no resources\n");
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ /* allocate private data */
|
|
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
+ if (!priv) {
|
|
+ dev_err(&pdev->dev, "can't allocate private data\n");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
+ adap = &priv->adap;
|
|
+ i2c_set_adapdata(adap, priv);
|
|
+ adap->owner = THIS_MODULE;
|
|
+ adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
|
|
+ strlcpy(adap->name, DRV_NAME "-adapter", sizeof(adap->name));
|
|
+ adap->algo = <q_i2c_algorithm;
|
|
+
|
|
+ if (of_property_read_u32(node, "clock-frequency", &priv->i2c_clock)) {
|
|
+ dev_warn(&pdev->dev, "No I2C speed selected, using 100kHz\n");
|
|
+ priv->i2c_clock = 100000;
|
|
+ }
|
|
+
|
|
+ init_completion(&priv->cmd_complete);
|
|
+ mutex_init(&priv->mutex);
|
|
+
|
|
+ priv->membase = devm_request_and_ioremap(&pdev->dev, mmres);
|
|
+ if (priv->membase == NULL)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ priv->dev = &pdev->dev;
|
|
+ priv->irq_lb = irqres[0].start;
|
|
+
|
|
+ ret = devm_request_irq(&pdev->dev, irqres[0].start, ltq_i2c_isr_burst,
|
|
+ IRQF_DISABLED, "i2c lb", priv);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't get last burst IRQ %d\n",
|
|
+ irqres[0].start);
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ ret = devm_request_irq(&pdev->dev, irqres[1].start, ltq_i2c_isr_burst,
|
|
+ IRQF_DISABLED, "i2c b", priv);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't get burst IRQ %d\n",
|
|
+ irqres[1].start);
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ ret = devm_request_irq(&pdev->dev, irqres[2].start, ltq_i2c_isr,
|
|
+ IRQF_DISABLED, "i2c err", priv);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't get error IRQ %d\n",
|
|
+ irqres[2].start);
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ ret = devm_request_irq(&pdev->dev, irqres[3].start, ltq_i2c_isr,
|
|
+ IRQF_DISABLED, "i2c p", priv);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't get protocol IRQ %d\n",
|
|
+ irqres[3].start);
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ dev_dbg(&pdev->dev, "mapped io-space to %p\n", priv->membase);
|
|
+ dev_dbg(&pdev->dev, "use IRQs %d, %d, %d, %d\n", irqres[0].start,
|
|
+ irqres[1].start, irqres[2].start, irqres[3].start);
|
|
+
|
|
+ priv->clk_gate = devm_clk_get(&pdev->dev, NULL);
|
|
+ if (IS_ERR(priv->clk_gate)) {
|
|
+ dev_err(&pdev->dev, "failed to get i2c clk\n");
|
|
+ return -ENOENT;
|
|
+ }
|
|
+
|
|
+ /* this is a static clock, which has no refcounting */
|
|
+ priv->clk_input = clk_get_fpi();
|
|
+ if (IS_ERR(priv->clk_input)) {
|
|
+ dev_err(&pdev->dev, "failed to get fpi clk\n");
|
|
+ return -ENOENT;
|
|
+ }
|
|
+
|
|
+ clk_activate(priv->clk_gate);
|
|
+
|
|
+ /* add our adapter to the i2c stack */
|
|
+ ret = i2c_add_numbered_adapter(adap);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't register I2C adapter\n");
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ platform_set_drvdata(pdev, priv);
|
|
+ i2c_set_adapdata(adap, priv);
|
|
+
|
|
+ /* print module version information */
|
|
+ dev_dbg(&pdev->dev, "module id=%u revision=%u\n",
|
|
+ (i2c_r32(id) & I2C_ID_ID_MASK) >> I2C_ID_ID_OFFSET,
|
|
+ (i2c_r32(id) & I2C_ID_REV_MASK) >> I2C_ID_REV_OFFSET);
|
|
+
|
|
+ /* initialize HW */
|
|
+ ret = ltq_i2c_hw_init(adap);
|
|
+ if (ret) {
|
|
+ dev_err(&pdev->dev, "can't configure adapter\n");
|
|
+ i2c_del_adapter(adap);
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+ } else {
|
|
+ dev_info(&pdev->dev, "version %s\n", DRV_VERSION);
|
|
+ }
|
|
+
|
|
+ of_i2c_register_devices(adap);
|
|
+
|
|
+out:
|
|
+ /* if init failed, we need to deactivate the clock gate */
|
|
+ if (ret)
|
|
+ clk_deactivate(priv->clk_gate);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int __devexit ltq_i2c_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct ltq_i2c *priv = platform_get_drvdata(pdev);
|
|
+
|
|
+ /* disable bus */
|
|
+ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
|
|
+
|
|
+ /* power down the core */
|
|
+ clk_deactivate(priv->clk_gate);
|
|
+
|
|
+ /* remove driver */
|
|
+ i2c_del_adapter(&priv->adap);
|
|
+ kfree(priv);
|
|
+
|
|
+ dev_dbg(&pdev->dev, "removed\n");
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+static const struct of_device_id ltq_i2c_match[] = {
|
|
+ { .compatible = "lantiq,lantiq-i2c" },
|
|
+ {},
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, ltq_i2c_match);
|
|
+
|
|
+static struct platform_driver ltq_i2c_driver = {
|
|
+ .probe = ltq_i2c_probe,
|
|
+ .remove = __devexit_p(ltq_i2c_remove),
|
|
+ .driver = {
|
|
+ .name = DRV_NAME,
|
|
+ .owner = THIS_MODULE,
|
|
+ .of_match_table = ltq_i2c_match,
|
|
+ },
|
|
+};
|
|
+
|
|
+module_platform_driver(ltq_i2c_driver);
|
|
+
|
|
+MODULE_DESCRIPTION("Lantiq I2C bus adapter");
|
|
+MODULE_AUTHOR("Thomas Langer <thomas.langer@lantiq.com>");
|
|
+MODULE_ALIAS("platform:" DRV_NAME);
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_VERSION(DRV_VERSION);
|
|
diff --git a/drivers/i2c/busses/i2c-lantiq.h b/drivers/i2c/busses/i2c-lantiq.h
|
|
new file mode 100644
|
|
index 0000000..7a86b89
|
|
--- /dev/null
|
|
+++ b/drivers/i2c/busses/i2c-lantiq.h
|
|
@@ -0,0 +1,234 @@
|
|
+#ifndef I2C_LANTIQ_H
|
|
+#define I2C_LANTIQ_H
|
|
+
|
|
+/* I2C register structure */
|
|
+struct lantiq_reg_i2c {
|
|
+ /* I2C Kernel Clock Control Register */
|
|
+ unsigned int clc; /* 0x00000000 */
|
|
+ /* Reserved */
|
|
+ unsigned int res_0; /* 0x00000004 */
|
|
+ /* I2C Identification Register */
|
|
+ unsigned int id; /* 0x00000008 */
|
|
+ /* Reserved */
|
|
+ unsigned int res_1; /* 0x0000000C */
|
|
+ /*
|
|
+ * I2C RUN Control Register
|
|
+ * This register enables and disables the I2C peripheral. Before
|
|
+ * enabling, the I2C has to be configured properly. After enabling
|
|
+ * no configuration is possible
|
|
+ */
|
|
+ unsigned int run_ctrl; /* 0x00000010 */
|
|
+ /*
|
|
+ * I2C End Data Control Register
|
|
+ * This register is used to either turn around the data transmission
|
|
+ * direction or to address another slave without sending a stop
|
|
+ * condition. Also the software can stop the slave-transmitter by
|
|
+ * sending a not-accolade when working as master-receiver or even
|
|
+ * stop data transmission immediately when operating as
|
|
+ * master-transmitter. The writing to the bits of this control
|
|
+ * register is only effective when in MASTER RECEIVES BYTES, MASTER
|
|
+ * TRANSMITS BYTES, MASTER RESTART or SLAVE RECEIVE BYTES state
|
|
+ */
|
|
+ unsigned int endd_ctrl; /* 0x00000014 */
|
|
+ /*
|
|
+ * I2C Fractional Divider Configuration Register
|
|
+ * These register is used to program the fractional divider of the I2C
|
|
+ * bus. Before the peripheral is switched on by setting the RUN-bit the
|
|
+ * two (fixed) values for the two operating frequencies are programmed
|
|
+ * into these (configuration) registers. The Register FDIV_HIGH_CFG has
|
|
+ * the same layout as I2C_FDIV_CFG.
|
|
+ */
|
|
+ unsigned int fdiv_cfg; /* 0x00000018 */
|
|
+ /*
|
|
+ * I2C Fractional Divider (highspeed mode) Configuration Register
|
|
+ * These register is used to program the fractional divider of the I2C
|
|
+ * bus. Before the peripheral is switched on by setting the RUN-bit the
|
|
+ * two (fixed) values for the two operating frequencies are programmed
|
|
+ * into these (configuration) registers. The Register FDIV_CFG has the
|
|
+ * same layout as I2C_FDIV_CFG.
|
|
+ */
|
|
+ unsigned int fdiv_high_cfg; /* 0x0000001C */
|
|
+ /* I2C Address Configuration Register */
|
|
+ unsigned int addr_cfg; /* 0x00000020 */
|
|
+ /* I2C Bus Status Register
|
|
+ * This register gives a status information of the I2C. This additional
|
|
+ * information can be used by the software to start proper actions.
|
|
+ */
|
|
+ unsigned int bus_stat; /* 0x00000024 */
|
|
+ /* I2C FIFO Configuration Register */
|
|
+ unsigned int fifo_cfg; /* 0x00000028 */
|
|
+ /* I2C Maximum Received Packet Size Register */
|
|
+ unsigned int mrps_ctrl; /* 0x0000002C */
|
|
+ /* I2C Received Packet Size Status Register */
|
|
+ unsigned int rps_stat; /* 0x00000030 */
|
|
+ /* I2C Transmit Packet Size Register */
|
|
+ unsigned int tps_ctrl; /* 0x00000034 */
|
|
+ /* I2C Filled FIFO Stages Status Register */
|
|
+ unsigned int ffs_stat; /* 0x00000038 */
|
|
+ /* Reserved */
|
|
+ unsigned int res_2; /* 0x0000003C */
|
|
+ /* I2C Timing Configuration Register */
|
|
+ unsigned int tim_cfg; /* 0x00000040 */
|
|
+ /* Reserved */
|
|
+ unsigned int res_3[7]; /* 0x00000044 */
|
|
+ /* I2C Error Interrupt Request Source Mask Register */
|
|
+ unsigned int err_irqsm; /* 0x00000060 */
|
|
+ /* I2C Error Interrupt Request Source Status Register */
|
|
+ unsigned int err_irqss; /* 0x00000064 */
|
|
+ /* I2C Error Interrupt Request Source Clear Register */
|
|
+ unsigned int err_irqsc; /* 0x00000068 */
|
|
+ /* Reserved */
|
|
+ unsigned int res_4; /* 0x0000006C */
|
|
+ /* I2C Protocol Interrupt Request Source Mask Register */
|
|
+ unsigned int p_irqsm; /* 0x00000070 */
|
|
+ /* I2C Protocol Interrupt Request Source Status Register */
|
|
+ unsigned int p_irqss; /* 0x00000074 */
|
|
+ /* I2C Protocol Interrupt Request Source Clear Register */
|
|
+ unsigned int p_irqsc; /* 0x00000078 */
|
|
+ /* Reserved */
|
|
+ unsigned int res_5; /* 0x0000007C */
|
|
+ /* I2C Raw Interrupt Status Register */
|
|
+ unsigned int ris; /* 0x00000080 */
|
|
+ /* I2C Interrupt Mask Control Register */
|
|
+ unsigned int imsc; /* 0x00000084 */
|
|
+ /* I2C Masked Interrupt Status Register */
|
|
+ unsigned int mis; /* 0x00000088 */
|
|
+ /* I2C Interrupt Clear Register */
|
|
+ unsigned int icr; /* 0x0000008C */
|
|
+ /* I2C Interrupt Set Register */
|
|
+ unsigned int isr; /* 0x00000090 */
|
|
+ /* I2C DMA Enable Register */
|
|
+ unsigned int dmae; /* 0x00000094 */
|
|
+ /* Reserved */
|
|
+ unsigned int res_6[8154]; /* 0x00000098 */
|
|
+ /* I2C Transmit Data Register */
|
|
+ unsigned int txd; /* 0x00008000 */
|
|
+ /* Reserved */
|
|
+ unsigned int res_7[4095]; /* 0x00008004 */
|
|
+ /* I2C Receive Data Register */
|
|
+ unsigned int rxd; /* 0x0000C000 */
|
|
+ /* Reserved */
|
|
+ unsigned int res_8[4095]; /* 0x0000C004 */
|
|
+};
|
|
+
|
|
+/*
|
|
+ * Clock Divider for Normal Run Mode
|
|
+ * Max 8-bit divider value. IF RMC is 0 the module is disabled. Note: As long
|
|
+ * as the new divider value RMC is not valid, the register returns 0x0000 00xx
|
|
+ * on reading.
|
|
+ */
|
|
+#define I2C_CLC_RMC_MASK 0x0000FF00
|
|
+/* field offset */
|
|
+#define I2C_CLC_RMC_OFFSET 8
|
|
+
|
|
+/* Fields of "I2C Identification Register" */
|
|
+/* Module ID */
|
|
+#define I2C_ID_ID_MASK 0x0000FF00
|
|
+/* field offset */
|
|
+#define I2C_ID_ID_OFFSET 8
|
|
+/* Revision */
|
|
+#define I2C_ID_REV_MASK 0x000000FF
|
|
+/* field offset */
|
|
+#define I2C_ID_REV_OFFSET 0
|
|
+
|
|
+/* Fields of "I2C Interrupt Mask Control Register" */
|
|
+/* Enable */
|
|
+#define I2C_IMSC_BREQ_INT_EN 0x00000008
|
|
+/* Enable */
|
|
+#define I2C_IMSC_LBREQ_INT_EN 0x00000004
|
|
+
|
|
+/* Fields of "I2C Fractional Divider Configuration Register" */
|
|
+/* field offset */
|
|
+#define I2C_FDIV_CFG_INC_OFFSET 16
|
|
+
|
|
+/* Fields of "I2C Interrupt Mask Control Register" */
|
|
+/* Enable */
|
|
+#define I2C_IMSC_I2C_P_INT_EN 0x00000020
|
|
+/* Enable */
|
|
+#define I2C_IMSC_I2C_ERR_INT_EN 0x00000010
|
|
+
|
|
+/* Fields of "I2C Error Interrupt Request Source Status Register" */
|
|
+/* TXF_OFL */
|
|
+#define I2C_ERR_IRQSS_TXF_OFL 0x00000008
|
|
+/* TXF_UFL */
|
|
+#define I2C_ERR_IRQSS_TXF_UFL 0x00000004
|
|
+/* RXF_OFL */
|
|
+#define I2C_ERR_IRQSS_RXF_OFL 0x00000002
|
|
+/* RXF_UFL */
|
|
+#define I2C_ERR_IRQSS_RXF_UFL 0x00000001
|
|
+
|
|
+/* Fields of "I2C Raw Interrupt Status Register" */
|
|
+/* Read: Interrupt occurred. */
|
|
+#define I2C_RIS_I2C_ERR_INT_INTOCC 0x00000010
|
|
+/* Read: Interrupt occurred. */
|
|
+#define I2C_RIS_I2C_P_INT_INTOCC 0x00000020
|
|
+
|
|
+/* Fields of "I2C FIFO Configuration Register" */
|
|
+/* TX FIFO Flow Control */
|
|
+#define I2C_FIFO_CFG_TXFC 0x00020000
|
|
+/* RX FIFO Flow Control */
|
|
+#define I2C_FIFO_CFG_RXFC 0x00010000
|
|
+/* Word aligned (character alignment of four characters) */
|
|
+#define I2C_FIFO_CFG_TXFA_TXFA2 0x00002000
|
|
+/* Word aligned (character alignment of four characters) */
|
|
+#define I2C_FIFO_CFG_RXFA_RXFA2 0x00000200
|
|
+/* 1 word */
|
|
+#define I2C_FIFO_CFG_TXBS_TXBS0 0x00000000
|
|
+
|
|
+/* Fields of "I2C FIFO Configuration Register" */
|
|
+/* 1 word */
|
|
+#define I2C_FIFO_CFG_RXBS_RXBS0 0x00000000
|
|
+/* Stop on Packet End Enable */
|
|
+#define I2C_ADDR_CFG_SOPE_EN 0x00200000
|
|
+/* Stop on Not Acknowledge Enable */
|
|
+#define I2C_ADDR_CFG_SONA_EN 0x00100000
|
|
+/* Enable */
|
|
+#define I2C_ADDR_CFG_MnS_EN 0x00080000
|
|
+
|
|
+/* Fields of "I2C Interrupt Clear Register" */
|
|
+/* Clear */
|
|
+#define I2C_ICR_BREQ_INT_CLR 0x00000008
|
|
+/* Clear */
|
|
+#define I2C_ICR_LBREQ_INT_CLR 0x00000004
|
|
+
|
|
+/* Fields of "I2C Fractional Divider Configuration Register" */
|
|
+/* field offset */
|
|
+#define I2C_FDIV_CFG_DEC_OFFSET 0
|
|
+
|
|
+/* Fields of "I2C Bus Status Register" */
|
|
+/* Bus Status */
|
|
+#define I2C_BUS_STAT_BS_MASK 0x00000003
|
|
+/* Read from I2C Bus. */
|
|
+#define I2C_BUS_STAT_RNW_READ 0x00000004
|
|
+/* I2C Bus is free. */
|
|
+#define I2C_BUS_STAT_BS_FREE 0x00000000
|
|
+/*
|
|
+ * The device is working as master and has claimed the control on the
|
|
+ * I2C-bus (busy master).
|
|
+ */
|
|
+#define I2C_BUS_STAT_BS_BM 0x00000002
|
|
+
|
|
+/* Fields of "I2C RUN Control Register" */
|
|
+/* Enable */
|
|
+#define I2C_RUN_CTRL_RUN_EN 0x00000001
|
|
+
|
|
+/* Fields of "I2C End Data Control Register" */
|
|
+/*
|
|
+ * Set End of Transmission
|
|
+ * Note:Do not write '1' to this bit when bus is free. This will cause an
|
|
+ * abort after the first byte when a new transfer is started.
|
|
+ */
|
|
+#define I2C_ENDD_CTRL_SETEND 0x00000002
|
|
+
|
|
+/* Fields of "I2C Protocol Interrupt Request Source Status Register" */
|
|
+/* NACK */
|
|
+#define I2C_P_IRQSS_NACK 0x00000010
|
|
+/* AL */
|
|
+#define I2C_P_IRQSS_AL 0x00000008
|
|
+/* RX */
|
|
+#define I2C_P_IRQSS_RX 0x00000040
|
|
+/* TX_END */
|
|
+#define I2C_P_IRQSS_TX_END 0x00000020
|
|
+
|
|
+
|
|
+#endif /* I2C_LANTIQ_H */
|
|
--
|
|
1.7.10.4
|
|
|