diff options
Diffstat (limited to 'target/linux/ramips/patches-3.10/0026-i2c-MIPS-adds-ralink-I2C-driver.patch')
| -rw-r--r-- | target/linux/ramips/patches-3.10/0026-i2c-MIPS-adds-ralink-I2C-driver.patch | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.10/0026-i2c-MIPS-adds-ralink-I2C-driver.patch b/target/linux/ramips/patches-3.10/0026-i2c-MIPS-adds-ralink-I2C-driver.patch new file mode 100644 index 0000000..bee64f8 --- /dev/null +++ b/target/linux/ramips/patches-3.10/0026-i2c-MIPS-adds-ralink-I2C-driver.patch @@ -0,0 +1,358 @@ +From 4596818bca07e0928168970839e08875cf51b4cc Mon Sep 17 00:00:00 2001 +From: John Crispin <blogic@openwrt.org> +Date: Mon, 29 Apr 2013 14:40:43 +0200 +Subject: [PATCH 26/33] 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 631736e..e2c2381 100644 +--- a/drivers/i2c/busses/Kconfig ++++ b/drivers/i2c/busses/Kconfig +@@ -628,6 +628,10 @@ 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 8f4fc23..7e39a13 100644 +--- a/drivers/i2c/busses/Makefile ++++ b/drivers/i2c/busses/Makefile +@@ -62,6 +62,7 @@ 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..f4dc13d +--- /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 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_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); ++ 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()) ++ return -1; ++ } ++ } ++ ++ return 0; ++} ++ ++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 + |