diff options
Diffstat (limited to 'target/linux/cns3xxx/files/drivers/i2c/busses/i2c-cns3xxx.c')
| -rw-r--r-- | target/linux/cns3xxx/files/drivers/i2c/busses/i2c-cns3xxx.c | 374 |
1 files changed, 0 insertions, 374 deletions
diff --git a/target/linux/cns3xxx/files/drivers/i2c/busses/i2c-cns3xxx.c b/target/linux/cns3xxx/files/drivers/i2c/busses/i2c-cns3xxx.c deleted file mode 100644 index 7acff37d26..0000000000 --- a/target/linux/cns3xxx/files/drivers/i2c/busses/i2c-cns3xxx.c +++ /dev/null @@ -1,374 +0,0 @@ -/* - * Cavium CNS3xxx I2C Host Controller - * - * Copyright 2010 Cavium Network - * Copyright 2012 Gateworks Corporation - * Chris Lang <clang@gateworks.com> - * Tim Harvey <tharvey@gateworks.com> - * - * This file is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, Version 2, as - * published by the Free Software Foundation. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/platform_device.h> -#include <asm/io.h> -#include <linux/wait.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/i2c.h> -#include <linux/slab.h> -#include <linux/clk.h> - -/* - * We need the memory map - */ - -#define I2C_MEM_MAP_ADDR(x) (i2c->base + x) -#define I2C_MEM_MAP_VALUE(x) (*((unsigned int volatile*)I2C_MEM_MAP_ADDR(x))) - -#define I2C_CONTROLLER_REG I2C_MEM_MAP_VALUE(0x00) -#define I2C_TIME_OUT_REG I2C_MEM_MAP_VALUE(0x04) -#define I2C_SLAVE_ADDRESS_REG I2C_MEM_MAP_VALUE(0x08) -#define I2C_WRITE_DATA_REG I2C_MEM_MAP_VALUE(0x0C) -#define I2C_READ_DATA_REG I2C_MEM_MAP_VALUE(0x10) -#define I2C_INTERRUPT_STATUS_REG I2C_MEM_MAP_VALUE(0x14) -#define I2C_INTERRUPT_ENABLE_REG I2C_MEM_MAP_VALUE(0x18) -#define I2C_TWI_OUT_DLY_REG I2C_MEM_MAP_VALUE(0x1C) - -#define I2C_BUS_ERROR_FLAG (0x1) -#define I2C_ACTION_DONE_FLAG (0x2) - -#define CNS3xxx_I2C_ENABLE() (I2C_CONTROLLER_REG) |= ((unsigned int)0x1 << 31) -#define CNS3xxx_I2C_DISABLE() (I2C_CONTROLLER_REG) &= ~((unsigned int)0x1 << 31) -#define CNS3xxx_I2C_ENABLE_INTR() (I2C_INTERRUPT_ENABLE_REG) |= 0x03 -#define CNS3xxx_I2C_DISABLE_INTR() (I2C_INTERRUPT_ENABLE_REG) &= 0xfc - -#define TWI_TIMEOUT (10*HZ) -#define I2C_100KHZ 100000 -#define I2C_200KHZ 200000 -#define I2C_300KHZ 300000 -#define I2C_400KHZ 400000 - -#define CNS3xxx_I2C_CLK I2C_100KHZ - -#define STATE_DONE 1 -#define STATE_ERROR 2 - -struct cns3xxx_i2c { - struct device *dev; - void __iomem *base; /* virtual */ - wait_queue_head_t wait; - struct i2c_adapter adap; - struct i2c_msg *msg; - u8 state; /* see STATE_ */ - u8 error; /* see TWI_STATUS register */ - int rd_wr_len; - u8 *buf; -}; - -static u32 cns3xxx_i2c_func(struct i2c_adapter *adap) -{ - return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; -} - -static int -cns3xxx_i2c_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg) -{ - struct cns3xxx_i2c *i2c = i2c_get_adapdata(adap); - int i, j; - u8 buf[1] = { 0 }; - - if (msg->len == 0) { - /* - * We are probably doing a probe for a device here, - * so set the length to one, and data to 0 - */ - msg->len = 1; - i2c->buf = buf; - } else { - i2c->buf = msg->buf; - } - - if (msg->flags & I2C_M_TEN) { - printk - ("%s:%d: Presently the driver does not handle extended addressing\n", - __FUNCTION__, __LINE__); - return -EINVAL; - } - i2c->msg = msg; - - for (i = 0; i < msg->len; i++) { - if (msg->len - i >= 4) - i2c->rd_wr_len = 3; - else - i2c->rd_wr_len = msg->len - i - 1; - - // Set Data Width and TWI_EN - I2C_CONTROLLER_REG = 0x80000000 | (i2c->rd_wr_len << 2) | (i2c->rd_wr_len); - - // Clear Write Reg - I2C_WRITE_DATA_REG = 0; - - // Set the slave address - I2C_SLAVE_ADDRESS_REG = (msg->addr << 1); - - // Are we Writing - if (!(msg->flags & I2C_M_RD)) { - I2C_CONTROLLER_REG |= (1 << 4); - if (i != 0) { - /* - * We need to set the address in the first byte. - * The base address is going to be in buf[0] and then - * it needs to be incremented by i - 1. - */ - i2c->buf--; - *i2c->buf = buf[0] + i - 1; - - if (i2c->rd_wr_len < 3) { - i += i2c->rd_wr_len; - i2c->rd_wr_len++; - I2C_CONTROLLER_REG = 0x80000000 | (1 << 4) | (i2c->rd_wr_len << 2) | (i2c->rd_wr_len); - } else { - i += i2c->rd_wr_len - 1; - } - } else { - i += i2c->rd_wr_len; - buf[0] = *i2c->buf; - } - for (j = 0; j <= i2c->rd_wr_len; j++) { - I2C_WRITE_DATA_REG |= ((*i2c->buf++) << (8 * j)); - } - } else { - i += i2c->rd_wr_len; - } - - // Start the Transfer - i2c->state = 0; // Clear out the State - i2c->error = 0; - I2C_CONTROLLER_REG |= (1 << 6); - - if (wait_event_timeout(i2c->wait, (i2c->state == STATE_ERROR) || - (i2c->state == STATE_DONE), TWI_TIMEOUT)) { - if (i2c->state == STATE_ERROR) { - dev_dbg(i2c->dev, "controller error: 0x%2x", i2c->error); - return -EAGAIN; // try again - } - } else { - dev_err(i2c->dev, "controller timed out " - "waiting for start condition to finish\n"); - return -ETIMEDOUT; - } - } - return 0; -} - -static int -cns3xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) -{ - int i; - int ret; - for (i = 0; i < num; i++) - { - ret = cns3xxx_i2c_xfer_msg(adap, &msgs[i]); - if (ret < 0) { - return ret; - } - } - return num; -} - - -static struct i2c_algorithm cns3xxx_i2c_algo = { - .master_xfer = cns3xxx_i2c_xfer, - .functionality = cns3xxx_i2c_func, -}; - -static struct i2c_adapter cns3xxx_i2c_adapter = { - .owner = THIS_MODULE, - .algo = &cns3xxx_i2c_algo, - .algo_data = NULL, - .nr = 0, - .name = "CNS3xxx I2C 0", - .retries = 5, -}; - -static void cns3xxx_i2c_adapter_init(struct cns3xxx_i2c *i2c) -{ - struct clk *clk; - - clk = devm_clk_get(i2c->dev, "cpu"); - if (WARN_ON(!clk)) - return; - - /* Disable the I2C */ - I2C_CONTROLLER_REG = 0; /* Disabled the I2C */ - - /* Check the Reg Dump when testing */ - I2C_TIME_OUT_REG = - (((((clk_get_rate(clk) / (2 * CNS3xxx_I2C_CLK)) - - 1) & 0x3FF) << 8) | (1 << 7) | 0x7F); - I2C_TWI_OUT_DLY_REG |= 0x3; - - /* Enable The Interrupt */ - CNS3xxx_I2C_ENABLE_INTR(); - - /* Clear Interrupt Status (0x2 | 0x1) */ - I2C_INTERRUPT_STATUS_REG |= (I2C_ACTION_DONE_FLAG | I2C_BUS_ERROR_FLAG); - - /* Enable the I2C Controller */ - CNS3xxx_I2C_ENABLE(); -} - -static irqreturn_t cns3xxx_i2c_isr(int irq, void *dev_id) -{ - struct cns3xxx_i2c *i2c = dev_id; - int i; - uint32_t stat = I2C_INTERRUPT_STATUS_REG; - - /* Clear Interrupt */ - I2C_INTERRUPT_STATUS_REG |= 0x1; - - if (stat & I2C_BUS_ERROR_FLAG) { - i2c->state = STATE_ERROR; - i2c->error = (I2C_INTERRUPT_STATUS_REG & 0xff00)>>8; - } else { - if (i2c->msg->flags & I2C_M_RD) { - for (i = 0; i <= i2c->rd_wr_len; i++) - { - *i2c->buf++ = ((I2C_READ_DATA_REG >> (8 * i)) & 0xff); - } - } - i2c->state = STATE_DONE; - } - wake_up(&i2c->wait); - return IRQ_HANDLED; -} - -static int cns3xxx_i2c_probe(struct platform_device *pdev) -{ - struct cns3xxx_i2c *i2c; - struct resource *res, *res2; - int ret; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - printk("%s: IORESOURCE_MEM not defined \n", __FUNCTION__); - return -ENODEV; - } - - res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!res2) { - printk("%s: IORESOURCE_IRQ not defined \n", __FUNCTION__); - return -ENODEV; - } - - i2c = kzalloc(sizeof(*i2c), GFP_KERNEL); - if (!i2c) - return -ENOMEM; - - if (!request_mem_region(res->start, res->end - res->start + 1, - pdev->name)) { - dev_err(&pdev->dev, "Memory region busy\n"); - ret = -EBUSY; - goto request_mem_failed; - } - - i2c->dev = &pdev->dev; - i2c->base = ioremap(res->start, res->end - res->start + 1); - if (!i2c->base) { - dev_err(&pdev->dev, "Unable to map registers\n"); - ret = -EIO; - goto map_failed; - } - - cns3xxx_i2c_adapter_init(i2c); - - init_waitqueue_head(&i2c->wait); - ret = request_irq(res2->start, cns3xxx_i2c_isr, 0, pdev->name, i2c); - if (ret) { - dev_err(&pdev->dev, "Cannot claim IRQ\n"); - goto request_irq_failed; - } - - platform_set_drvdata(pdev, i2c); - i2c->adap = cns3xxx_i2c_adapter; - i2c_set_adapdata(&i2c->adap, i2c); - i2c->adap.dev.parent = &pdev->dev; - - /* add i2c adapter to i2c tree */ - ret = i2c_add_numbered_adapter(&i2c->adap); - if (ret) { - dev_err(&pdev->dev, "Failed to add adapter\n"); - goto add_adapter_failed; - } - - return 0; - - add_adapter_failed: - free_irq(res2->start, i2c); - request_irq_failed: - iounmap(i2c->base); - map_failed: - release_mem_region(res->start, res->end - res->start + 1); - request_mem_failed: - kfree(i2c); - - return ret; -} - -static int cns3xxx_i2c_remove(struct platform_device *pdev) -{ - struct cns3xxx_i2c *i2c = platform_get_drvdata(pdev); - struct resource *res; - - /* disable i2c logic */ - CNS3xxx_I2C_DISABLE_INTR(); - CNS3xxx_I2C_DISABLE(); - /* remove adapter & data */ - i2c_del_adapter(&i2c->adap); - platform_set_drvdata(pdev, NULL); - - res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (res) - free_irq(res->start, i2c); - - iounmap(i2c->base); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res) - release_mem_region(res->start, res->end - res->start + 1); - - kfree(i2c); - - return 0; -} - -static struct platform_driver cns3xxx_i2c_driver = { - .probe = cns3xxx_i2c_probe, - .remove = cns3xxx_i2c_remove, - .driver = { - .owner = THIS_MODULE, - .name = "cns3xxx-i2c", - }, -}; - -static int __init cns3xxx_i2c_init(void) -{ - return platform_driver_register(&cns3xxx_i2c_driver); -} - -static void __exit cns3xxx_i2c_exit(void) -{ - platform_driver_unregister(&cns3xxx_i2c_driver); -} - -module_init(cns3xxx_i2c_init); -module_exit(cns3xxx_i2c_exit); - -MODULE_AUTHOR("Cavium Networks"); -MODULE_DESCRIPTION("Cavium CNS3XXX I2C Controller"); -MODULE_LICENSE("GPL"); |