aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/ramips/patches-3.8/0066-i2c-MIPS-adds-ralink-I2C-driver.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/ramips/patches-3.8/0066-i2c-MIPS-adds-ralink-I2C-driver.patch')
-rw-r--r--target/linux/ramips/patches-3.8/0066-i2c-MIPS-adds-ralink-I2C-driver.patch358
1 files changed, 0 insertions, 358 deletions
diff --git a/target/linux/ramips/patches-3.8/0066-i2c-MIPS-adds-ralink-I2C-driver.patch b/target/linux/ramips/patches-3.8/0066-i2c-MIPS-adds-ralink-I2C-driver.patch
deleted file mode 100644
index 286020a148..0000000000
--- a/target/linux/ramips/patches-3.8/0066-i2c-MIPS-adds-ralink-I2C-driver.patch
+++ /dev/null
@@ -1,358 +0,0 @@
-From 68fc18202484e98861ef7eed2a78b64b16c73db9 Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Mon, 29 Apr 2013 14:40:43 +0200
-Subject: [PATCH 66/79] 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
-
-diff --git a/Documentation/devicetree/bindings/i2c/i2c-ralink.txt b/Documentation/devicetree/bindings/i2c/i2c-ralink.txt
-new file mode 100644
-index 0000000..8fa8ac3
---- /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>;
-+ };
-+ };
-+};
-diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
-index bdca511..19b1105 100644
---- a/drivers/i2c/busses/Kconfig
-+++ b/drivers/i2c/busses/Kconfig
-@@ -604,6 +604,10 @@ config I2C_PXA_SLAVE
- is necessary for systems where the PXA may be a target on the
- I2C bus.
-
-+config I2C_RALINK
-+ tristate "Ralink I2C Controller"
-+ select OF_I2C
-+
- config HAVE_S3C2410_I2C
- bool
- help
-diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
-index 6181f3f..4cf4a88 100644
---- a/drivers/i2c/busses/Makefile
-+++ b/drivers/i2c/busses/Makefile
-@@ -60,6 +60,7 @@ 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_S3C2410) += i2c-s3c2410.o
- obj-$(CONFIG_I2C_S6000) += i2c-s6000.o
- obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o
-diff --git a/drivers/i2c/busses/i2c-ralink.c b/drivers/i2c/busses/i2c-ralink.c
-new file mode 100644
-index 0000000..b5abf0f
---- /dev/null
-+++ b/drivers/i2c/busses/i2c-ralink.c
-@@ -0,0 +1,274 @@
-+/*
-+ * drivers/i2c/busses/i2c-ralink.c
-+ *
-+ * Copyright (C) 2013 Steven Liu <steven_liu@mediatek.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/of_i2c.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 0x400
-+
-+#define CLKDIV_VALUE 600
-+
-+#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_wait_rx_done(void)
-+{
-+ int retries = I2C_RETRY;
-+
-+ do {
-+ if (!retries--)
-+ break;
-+ } while(!(rt_i2c_r32(REG_STATUS_REG) & I2C_DATARDY));
-+
-+ return (retries < 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);
-+}
-+
-+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;
-+
-+ 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++) {
-+ rt_i2c_wait_idle();
-+ 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())
-+ return -1;
-+ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG);
-+ }
-+ }
-+
-+ rt_i2c_wait_idle();
-+ 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())
-+ return -1;
-+ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG);
-+ }
-+ } else {
-+ rt_i2c_wait_idle();
-+ rt_i2c_w32(msg->len - 1, REG_BYTECNT_REG);
-+ rt_i2c_w32(msg->buf[0], REG_DATAOUT_REG);
-+ rt_i2c_w32(WRITE_CMD, REG_STARTXFR_REG);
-+ for (i = 1; i < msg->len; i++) {
-+ rt_i2c_w32(msg->buf[i], REG_DATAOUT_REG);
-+ if (rt_i2c_wait_tx_done())
-+ return -1;
-+ }
-+ }
-+
-+ return msg->len;
-+}
-+
-+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 transfer failed\n");
-+ return 0;
-+ }
-+
-+ 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) {
-+ printk("i2c transfer failed\n");
-+ return 0;
-+ }
-+
-+ 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_request_and_ioremap(&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;
-+
-+ of_i2c_register_devices(adapter);
-+
-+ 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");
---
-1.7.10.4
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-29 05:36:53 +0000