mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 22:23:27 +00:00
654bc380ec
keep default as 3.14, mt7621 gic need to be ported to 3.18 Signed-off-by: John Crispin <blogic@openwrt.org> SVN-Revision: 44349
371 lines
9.1 KiB
Diff
371 lines
9.1 KiB
Diff
From 225f36695bb07dad9510f9affd79e63f1a44a195 Mon Sep 17 00:00:00 2001
|
|
From: John Crispin <blogic@openwrt.org>
|
|
Date: Sun, 27 Jul 2014 09:52:56 +0100
|
|
Subject: [PATCH 52/57] i2c: MIPS: adds ralink I2C driver
|
|
|
|
Signed-off-by: John Crispin <blogic@openwrt.org>
|
|
---
|
|
.../devicetree/bindings/i2c/i2c-ralink.txt | 27 ++
|
|
drivers/i2c/busses/Kconfig | 4 +
|
|
drivers/i2c/busses/Makefile | 1 +
|
|
drivers/i2c/busses/i2c-ralink.c | 274 ++++++++++++++++++++
|
|
4 files changed, 306 insertions(+)
|
|
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-ralink.txt
|
|
create mode 100644 drivers/i2c/busses/i2c-ralink.c
|
|
|
|
--- /dev/null
|
|
+++ b/Documentation/devicetree/bindings/i2c/i2c-ralink.txt
|
|
@@ -0,0 +1,27 @@
|
|
+I2C for Ralink platforms
|
|
+
|
|
+Required properties :
|
|
+- compatible : Must be "link,rt3052-i2c"
|
|
+- reg: physical base address of the controller and length of memory mapped
|
|
+ region.
|
|
+- #address-cells = <1>;
|
|
+- #size-cells = <0>;
|
|
+
|
|
+Optional properties:
|
|
+- Child nodes conforming to i2c bus binding
|
|
+
|
|
+Example :
|
|
+
|
|
+palmbus@10000000 {
|
|
+ i2c@900 {
|
|
+ compatible = "link,rt3052-i2c";
|
|
+ reg = <0x900 0x100>;
|
|
+ #address-cells = <1>;
|
|
+ #size-cells = <0>;
|
|
+
|
|
+ hwmon@4b {
|
|
+ compatible = "national,lm92";
|
|
+ reg = <0x4b>;
|
|
+ };
|
|
+ };
|
|
+};
|
|
--- a/drivers/i2c/busses/Kconfig
|
|
+++ b/drivers/i2c/busses/Kconfig
|
|
@@ -710,6 +710,10 @@ config I2C_RK3X
|
|
This driver can also be built as a module. If so, the module will
|
|
be called i2c-rk3x.
|
|
|
|
+config I2C_RALINK
|
|
+ tristate "Ralink I2C Controller"
|
|
+ select OF_I2C
|
|
+
|
|
config HAVE_S3C2410_I2C
|
|
bool
|
|
help
|
|
--- a/drivers/i2c/busses/Makefile
|
|
+++ b/drivers/i2c/busses/Makefile
|
|
@@ -66,6 +66,7 @@ obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
|
|
obj-$(CONFIG_I2C_PUV3) += i2c-puv3.o
|
|
obj-$(CONFIG_I2C_PXA) += i2c-pxa.o
|
|
obj-$(CONFIG_I2C_PXA_PCI) += i2c-pxa-pci.o
|
|
+obj-$(CONFIG_I2C_RALINK) += i2c-ralink.o
|
|
obj-$(CONFIG_I2C_QUP) += i2c-qup.o
|
|
obj-$(CONFIG_I2C_RIIC) += i2c-riic.o
|
|
obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o
|
|
--- /dev/null
|
|
+++ b/drivers/i2c/busses/i2c-ralink.c
|
|
@@ -0,0 +1,299 @@
|
|
+/*
|
|
+ * drivers/i2c/busses/i2c-ralink.c
|
|
+ *
|
|
+ * Copyright (C) 2013 Steven Liu <steven_liu@mediatek.com>
|
|
+ *
|
|
+ * Improve driver for i2cdetect from i2c-tools to detect i2c devices on the bus.
|
|
+ * (C) 2014 Sittisak <sittisaks@hotmail.com>
|
|
+ *
|
|
+ * This software is licensed under the terms of the GNU General Public
|
|
+ * License version 2, as published by the Free Software Foundation, and
|
|
+ * may be copied, distributed, and modified under those terms.
|
|
+ *
|
|
+ * 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.
|
|
+ *
|
|
+ */
|
|
+
|
|
+#include <linux/interrupt.h>
|
|
+#include <linux/kernel.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/reset.h>
|
|
+#include <linux/delay.h>
|
|
+#include <linux/slab.h>
|
|
+#include <linux/init.h>
|
|
+#include <linux/errno.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <linux/i2c.h>
|
|
+#include <linux/io.h>
|
|
+#include <linux/err.h>
|
|
+
|
|
+#include <asm/mach-ralink/ralink_regs.h>
|
|
+
|
|
+#define REG_CONFIG_REG 0x00
|
|
+#define REG_CLKDIV_REG 0x04
|
|
+#define REG_DEVADDR_REG 0x08
|
|
+#define REG_ADDR_REG 0x0C
|
|
+#define REG_DATAOUT_REG 0x10
|
|
+#define REG_DATAIN_REG 0x14
|
|
+#define REG_STATUS_REG 0x18
|
|
+#define REG_STARTXFR_REG 0x1C
|
|
+#define REG_BYTECNT_REG 0x20
|
|
+
|
|
+#define I2C_STARTERR BIT(4)
|
|
+#define I2C_ACKERR BIT(3)
|
|
+#define I2C_DATARDY BIT(2)
|
|
+#define I2C_SDOEMPTY BIT(1)
|
|
+#define I2C_BUSY BIT(0)
|
|
+
|
|
+#define I2C_DEVADLEN_7 (6 << 2)
|
|
+#define I2C_ADDRDIS BIT(1)
|
|
+
|
|
+#define I2C_RETRY 0x1000
|
|
+
|
|
+#define CLKDIV_VALUE 200 // clock rate is 40M, 40M / (200*2) = 100k (standard i2c bus rate).
|
|
+//#define CLKDIV_VALUE 50 // clock rate is 40M, 40M / (50*2) = 400k (fast i2c bus rate).
|
|
+
|
|
+#define READ_CMD 0x01
|
|
+#define WRITE_CMD 0x00
|
|
+#define READ_BLOCK 64
|
|
+
|
|
+static void __iomem *membase;
|
|
+static struct i2c_adapter *adapter;
|
|
+
|
|
+static void rt_i2c_w32(u32 val, unsigned reg)
|
|
+{
|
|
+ iowrite32(val, membase + reg);
|
|
+}
|
|
+
|
|
+static u32 rt_i2c_r32(unsigned reg)
|
|
+{
|
|
+ return ioread32(membase + reg);
|
|
+}
|
|
+
|
|
+static inline int rt_i2c_get_ack(void)
|
|
+{
|
|
+ return (rt_i2c_r32(REG_STATUS_REG) & I2C_ACKERR) ? -EIO : 0;
|
|
+}
|
|
+
|
|
+static inline int rt_i2c_wait_rx_done(void)
|
|
+{
|
|
+ int retries = I2C_RETRY;
|
|
+
|
|
+ do {
|
|
+ if (!retries--)
|
|
+ break;
|
|
+ } while(!(rt_i2c_r32(REG_STATUS_REG) & I2C_DATARDY));
|
|
+
|
|
+ return (retries < 0) ? -ETIMEDOUT : 0;
|
|
+}
|
|
+
|
|
+static inline int rt_i2c_wait_idle(void)
|
|
+{
|
|
+ int retries = I2C_RETRY;
|
|
+
|
|
+ do {
|
|
+ if (!retries--)
|
|
+ break;
|
|
+ } while(rt_i2c_r32(REG_STATUS_REG) & I2C_BUSY);
|
|
+
|
|
+ return (retries < 0);
|
|
+}
|
|
+
|
|
+static inline int rt_i2c_wait_tx_done(void)
|
|
+{
|
|
+ int retries = I2C_RETRY;
|
|
+
|
|
+ do {
|
|
+ if (!retries--)
|
|
+ break;
|
|
+ } while(!(rt_i2c_r32(REG_STATUS_REG) & I2C_SDOEMPTY));
|
|
+
|
|
+ return (retries < 0) ? -ETIMEDOUT : 0;
|
|
+}
|
|
+
|
|
+static int rt_i2c_handle_msg(struct i2c_adapter *a, struct i2c_msg* msg)
|
|
+{
|
|
+ int i = 0, j = 0, pos = 0;
|
|
+ int nblock = msg->len / READ_BLOCK;
|
|
+ int rem = msg->len % READ_BLOCK;
|
|
+ int ret = 0;
|
|
+
|
|
+ if (msg->flags & I2C_M_TEN) {
|
|
+ printk("10 bits addr not supported\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
+ if (msg->flags & I2C_M_RD) {
|
|
+ for (i = 0; i < nblock; i++) {
|
|
+ if (rt_i2c_wait_idle()) {
|
|
+ printk("i2c-read line busy\n");
|
|
+ return -ETIMEDOUT;
|
|
+ }
|
|
+ rt_i2c_w32(READ_BLOCK - 1, REG_BYTECNT_REG);
|
|
+ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG);
|
|
+ for (j = 0; j < READ_BLOCK; j++) {
|
|
+ if (rt_i2c_wait_rx_done() < 0)
|
|
+ ret = rt_i2c_wait_rx_done();
|
|
+ if (rt_i2c_get_ack() < 0)
|
|
+ ret = rt_i2c_get_ack();
|
|
+ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (rt_i2c_wait_idle()) {
|
|
+ printk("i2c-read line busy\n");
|
|
+ return -ETIMEDOUT;
|
|
+ }
|
|
+ if (rem) {
|
|
+ rt_i2c_w32(rem - 1, REG_BYTECNT_REG);
|
|
+ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG);
|
|
+ }
|
|
+ for (i = 0; i < rem; i++) {
|
|
+ if (rt_i2c_wait_rx_done() < 0)
|
|
+ ret = rt_i2c_wait_rx_done();
|
|
+ if (rt_i2c_get_ack() < 0)
|
|
+ ret = rt_i2c_get_ack();
|
|
+
|
|
+ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG);
|
|
+ }
|
|
+ } else {
|
|
+ if (rt_i2c_wait_idle()) {
|
|
+ printk("i2c-write line busy\n");
|
|
+ return -ETIMEDOUT;
|
|
+ }
|
|
+ rt_i2c_w32(msg->len - 1, REG_BYTECNT_REG);
|
|
+ for (i = 0; i < msg->len; i++) {
|
|
+ rt_i2c_w32(msg->buf[i], REG_DATAOUT_REG);
|
|
+ rt_i2c_w32(WRITE_CMD, REG_STARTXFR_REG);
|
|
+
|
|
+ if (rt_i2c_wait_tx_done() < 0)
|
|
+ ret = rt_i2c_wait_tx_done();
|
|
+ if (rt_i2c_get_ack() < 0)
|
|
+ ret = rt_i2c_get_ack();
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int rt_i2c_master_xfer(struct i2c_adapter *a, struct i2c_msg *m, int n)
|
|
+{
|
|
+ int i = 0;
|
|
+ int ret = 0;
|
|
+
|
|
+ if (rt_i2c_wait_idle()) {
|
|
+ printk("i2c-master_xfer line busy\n");
|
|
+ return -ETIMEDOUT;
|
|
+ }
|
|
+
|
|
+ device_reset(a->dev.parent);
|
|
+
|
|
+ rt_i2c_w32(m->addr, REG_DEVADDR_REG);
|
|
+ rt_i2c_w32(I2C_DEVADLEN_7 | I2C_ADDRDIS, REG_CONFIG_REG);
|
|
+ rt_i2c_w32(CLKDIV_VALUE, REG_CLKDIV_REG);
|
|
+
|
|
+ for (i = 0; i < n && !ret; i++) {
|
|
+ ret = rt_i2c_handle_msg(a, &m[i]);
|
|
+
|
|
+ if (ret < 0) {
|
|
+ return ret;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return n;
|
|
+}
|
|
+
|
|
+static u32 rt_i2c_func(struct i2c_adapter *a)
|
|
+{
|
|
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
|
|
+}
|
|
+
|
|
+static const struct i2c_algorithm rt_i2c_algo = {
|
|
+ .master_xfer = rt_i2c_master_xfer,
|
|
+ .functionality = rt_i2c_func,
|
|
+};
|
|
+
|
|
+static int rt_i2c_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
+ int ret;
|
|
+
|
|
+ if (!res) {
|
|
+ dev_err(&pdev->dev, "no memory resource found\n");
|
|
+ return -ENODEV;
|
|
+ }
|
|
+
|
|
+ adapter = devm_kzalloc(&pdev->dev, sizeof(struct i2c_adapter), GFP_KERNEL);
|
|
+ if (!adapter) {
|
|
+ dev_err(&pdev->dev, "failed to allocate i2c_adapter\n");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
+
|
|
+ membase = devm_ioremap_resource(&pdev->dev, res);
|
|
+ if (IS_ERR(membase))
|
|
+ return PTR_ERR(membase);
|
|
+
|
|
+ strlcpy(adapter->name, dev_name(&pdev->dev), sizeof(adapter->name));
|
|
+ adapter->owner = THIS_MODULE;
|
|
+ adapter->nr = pdev->id;
|
|
+ adapter->timeout = HZ;
|
|
+ adapter->algo = &rt_i2c_algo;
|
|
+ adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
|
|
+ adapter->dev.parent = &pdev->dev;
|
|
+ adapter->dev.of_node = pdev->dev.of_node;
|
|
+
|
|
+ ret = i2c_add_numbered_adapter(adapter);
|
|
+ if (ret)
|
|
+ return ret;
|
|
+
|
|
+ platform_set_drvdata(pdev, adapter);
|
|
+
|
|
+ dev_info(&pdev->dev, "loaded\n");
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int rt_i2c_remove(struct platform_device *pdev)
|
|
+{
|
|
+ platform_set_drvdata(pdev, NULL);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static const struct of_device_id i2c_rt_dt_ids[] = {
|
|
+ { .compatible = "ralink,rt2880-i2c", },
|
|
+ { /* sentinel */ }
|
|
+};
|
|
+
|
|
+MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids);
|
|
+
|
|
+static struct platform_driver rt_i2c_driver = {
|
|
+ .probe = rt_i2c_probe,
|
|
+ .remove = rt_i2c_remove,
|
|
+ .driver = {
|
|
+ .owner = THIS_MODULE,
|
|
+ .name = "i2c-ralink",
|
|
+ .of_match_table = i2c_rt_dt_ids,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __init i2c_rt_init (void)
|
|
+{
|
|
+ return platform_driver_register(&rt_i2c_driver);
|
|
+}
|
|
+subsys_initcall(i2c_rt_init);
|
|
+
|
|
+static void __exit i2c_rt_exit (void)
|
|
+{
|
|
+ platform_driver_unregister(&rt_i2c_driver);
|
|
+}
|
|
+
|
|
+module_exit (i2c_rt_exit);
|
|
+
|
|
+MODULE_AUTHOR("Steven Liu <steven_liu@mediatek.com>");
|
|
+MODULE_DESCRIPTION("Ralink I2c host driver");
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_ALIAS("platform:Ralink-I2C");
|