diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/busses/i2c-ocores.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/i2c/busses/i2c-ocores.c | 414 |
1 files changed, 0 insertions, 414 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/busses/i2c-ocores.c b/ANDROID_3.4.5/drivers/i2c/busses/i2c-ocores.c deleted file mode 100644 index 18068dee..00000000 --- a/ANDROID_3.4.5/drivers/i2c/busses/i2c-ocores.c +++ /dev/null @@ -1,414 +0,0 @@ -/* - * i2c-ocores.c: I2C bus driver for OpenCores I2C controller - * (http://www.opencores.org/projects.cgi/web/i2c/overview). - * - * Peter Korsgaard <jacmet@sunsite.dk> - * - * This file is licensed under the terms of the GNU General Public License - * version 2. This program is licensed "as is" without any warranty of any - * kind, whether express or implied. - */ - -/* - * Device tree configuration: - * - * Required properties: - * - compatible : "opencores,i2c-ocores" - * - reg : bus address start and address range size of device - * - interrupts : interrupt number - * - regstep : size of device registers in bytes - * - clock-frequency : frequency of bus clock in Hz - * - * Example: - * - * i2c0: ocores@a0000000 { - * compatible = "opencores,i2c-ocores"; - * reg = <0xa0000000 0x8>; - * interrupts = <10>; - * - * regstep = <1>; - * clock-frequency = <20000000>; - * - * -- Devices connected on this I2C bus get - * -- defined here; address- and size-cells - * -- apply to these child devices - * - * #address-cells = <1>; - * #size-cells = <0>; - * - * dummy@60 { - * compatible = "dummy"; - * reg = <60>; - * }; - * }; - * - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/platform_device.h> -#include <linux/i2c.h> -#include <linux/interrupt.h> -#include <linux/wait.h> -#include <linux/i2c-ocores.h> -#include <linux/slab.h> -#include <linux/io.h> - -struct ocores_i2c { - void __iomem *base; - int regstep; - wait_queue_head_t wait; - struct i2c_adapter adap; - struct i2c_msg *msg; - int pos; - int nmsgs; - int state; /* see STATE_ */ - int clock_khz; -}; - -/* registers */ -#define OCI2C_PRELOW 0 -#define OCI2C_PREHIGH 1 -#define OCI2C_CONTROL 2 -#define OCI2C_DATA 3 -#define OCI2C_CMD 4 /* write only */ -#define OCI2C_STATUS 4 /* read only, same address as OCI2C_CMD */ - -#define OCI2C_CTRL_IEN 0x40 -#define OCI2C_CTRL_EN 0x80 - -#define OCI2C_CMD_START 0x91 -#define OCI2C_CMD_STOP 0x41 -#define OCI2C_CMD_READ 0x21 -#define OCI2C_CMD_WRITE 0x11 -#define OCI2C_CMD_READ_ACK 0x21 -#define OCI2C_CMD_READ_NACK 0x29 -#define OCI2C_CMD_IACK 0x01 - -#define OCI2C_STAT_IF 0x01 -#define OCI2C_STAT_TIP 0x02 -#define OCI2C_STAT_ARBLOST 0x20 -#define OCI2C_STAT_BUSY 0x40 -#define OCI2C_STAT_NACK 0x80 - -#define STATE_DONE 0 -#define STATE_START 1 -#define STATE_WRITE 2 -#define STATE_READ 3 -#define STATE_ERROR 4 - -static inline void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value) -{ - iowrite8(value, i2c->base + reg * i2c->regstep); -} - -static inline u8 oc_getreg(struct ocores_i2c *i2c, int reg) -{ - return ioread8(i2c->base + reg * i2c->regstep); -} - -static void ocores_process(struct ocores_i2c *i2c) -{ - struct i2c_msg *msg = i2c->msg; - u8 stat = oc_getreg(i2c, OCI2C_STATUS); - - if ((i2c->state == STATE_DONE) || (i2c->state == STATE_ERROR)) { - /* stop has been sent */ - oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK); - wake_up(&i2c->wait); - return; - } - - /* error? */ - if (stat & OCI2C_STAT_ARBLOST) { - i2c->state = STATE_ERROR; - oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP); - return; - } - - if ((i2c->state == STATE_START) || (i2c->state == STATE_WRITE)) { - i2c->state = - (msg->flags & I2C_M_RD) ? STATE_READ : STATE_WRITE; - - if (stat & OCI2C_STAT_NACK) { - i2c->state = STATE_ERROR; - oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP); - return; - } - } else - msg->buf[i2c->pos++] = oc_getreg(i2c, OCI2C_DATA); - - /* end of msg? */ - if (i2c->pos == msg->len) { - i2c->nmsgs--; - i2c->msg++; - i2c->pos = 0; - msg = i2c->msg; - - if (i2c->nmsgs) { /* end? */ - /* send start? */ - if (!(msg->flags & I2C_M_NOSTART)) { - u8 addr = (msg->addr << 1); - - if (msg->flags & I2C_M_RD) - addr |= 1; - - i2c->state = STATE_START; - - oc_setreg(i2c, OCI2C_DATA, addr); - oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START); - return; - } else - i2c->state = (msg->flags & I2C_M_RD) - ? STATE_READ : STATE_WRITE; - } else { - i2c->state = STATE_DONE; - oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP); - return; - } - } - - if (i2c->state == STATE_READ) { - oc_setreg(i2c, OCI2C_CMD, i2c->pos == (msg->len-1) ? - OCI2C_CMD_READ_NACK : OCI2C_CMD_READ_ACK); - } else { - oc_setreg(i2c, OCI2C_DATA, msg->buf[i2c->pos++]); - oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_WRITE); - } -} - -static irqreturn_t ocores_isr(int irq, void *dev_id) -{ - struct ocores_i2c *i2c = dev_id; - - ocores_process(i2c); - - return IRQ_HANDLED; -} - -static int ocores_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) -{ - struct ocores_i2c *i2c = i2c_get_adapdata(adap); - - i2c->msg = msgs; - i2c->pos = 0; - i2c->nmsgs = num; - i2c->state = STATE_START; - - oc_setreg(i2c, OCI2C_DATA, - (i2c->msg->addr << 1) | - ((i2c->msg->flags & I2C_M_RD) ? 1:0)); - - oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START); - - if (wait_event_timeout(i2c->wait, (i2c->state == STATE_ERROR) || - (i2c->state == STATE_DONE), HZ)) - return (i2c->state == STATE_DONE) ? num : -EIO; - else - return -ETIMEDOUT; -} - -static void ocores_init(struct ocores_i2c *i2c) -{ - int prescale; - u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL); - - /* make sure the device is disabled */ - oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN)); - - prescale = (i2c->clock_khz / (5*100)) - 1; - oc_setreg(i2c, OCI2C_PRELOW, prescale & 0xff); - oc_setreg(i2c, OCI2C_PREHIGH, prescale >> 8); - - /* Init the device */ - oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK); - oc_setreg(i2c, OCI2C_CONTROL, ctrl | OCI2C_CTRL_IEN | OCI2C_CTRL_EN); -} - - -static u32 ocores_func(struct i2c_adapter *adap) -{ - return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; -} - -static const struct i2c_algorithm ocores_algorithm = { - .master_xfer = ocores_xfer, - .functionality = ocores_func, -}; - -static struct i2c_adapter ocores_adapter = { - .owner = THIS_MODULE, - .name = "i2c-ocores", - .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, - .algo = &ocores_algorithm, -}; - -#ifdef CONFIG_OF -static int ocores_i2c_of_probe(struct platform_device* pdev, - struct ocores_i2c* i2c) -{ - const __be32* val; - - val = of_get_property(pdev->dev.of_node, "regstep", NULL); - if (!val) { - dev_err(&pdev->dev, "Missing required parameter 'regstep'"); - return -ENODEV; - } - i2c->regstep = be32_to_cpup(val); - - val = of_get_property(pdev->dev.of_node, "clock-frequency", NULL); - if (!val) { - dev_err(&pdev->dev, - "Missing required parameter 'clock-frequency'"); - return -ENODEV; - } - i2c->clock_khz = be32_to_cpup(val) / 1000; - - return 0; -} -#else -#define ocores_i2c_of_probe(pdev,i2c) -ENODEV -#endif - -static int __devinit ocores_i2c_probe(struct platform_device *pdev) -{ - struct ocores_i2c *i2c; - struct ocores_i2c_platform_data *pdata; - struct resource *res, *res2; - int ret; - int i; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENODEV; - - res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!res2) - return -ENODEV; - - i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL); - if (!i2c) - return -ENOMEM; - - if (!devm_request_mem_region(&pdev->dev, res->start, - resource_size(res), pdev->name)) { - dev_err(&pdev->dev, "Memory region busy\n"); - return -EBUSY; - } - - i2c->base = devm_ioremap_nocache(&pdev->dev, res->start, - resource_size(res)); - if (!i2c->base) { - dev_err(&pdev->dev, "Unable to map registers\n"); - return -EIO; - } - - pdata = pdev->dev.platform_data; - if (pdata) { - i2c->regstep = pdata->regstep; - i2c->clock_khz = pdata->clock_khz; - } else { - ret = ocores_i2c_of_probe(pdev, i2c); - if (ret) - return ret; - } - - ocores_init(i2c); - - init_waitqueue_head(&i2c->wait); - ret = devm_request_irq(&pdev->dev, res2->start, ocores_isr, 0, - pdev->name, i2c); - if (ret) { - dev_err(&pdev->dev, "Cannot claim IRQ\n"); - return ret; - } - - /* hook up driver to tree */ - platform_set_drvdata(pdev, i2c); - i2c->adap = ocores_adapter; - i2c_set_adapdata(&i2c->adap, i2c); - i2c->adap.dev.parent = &pdev->dev; - i2c->adap.dev.of_node = pdev->dev.of_node; - - /* add i2c adapter to i2c tree */ - ret = i2c_add_adapter(&i2c->adap); - if (ret) { - dev_err(&pdev->dev, "Failed to add adapter\n"); - return ret; - } - - /* add in known devices to the bus */ - if (pdata) { - for (i = 0; i < pdata->num_devices; i++) - i2c_new_device(&i2c->adap, pdata->devices + i); - } - - return 0; -} - -static int __devexit ocores_i2c_remove(struct platform_device* pdev) -{ - struct ocores_i2c *i2c = platform_get_drvdata(pdev); - - /* disable i2c logic */ - oc_setreg(i2c, OCI2C_CONTROL, oc_getreg(i2c, OCI2C_CONTROL) - & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN)); - - /* remove adapter & data */ - i2c_del_adapter(&i2c->adap); - platform_set_drvdata(pdev, NULL); - - return 0; -} - -#ifdef CONFIG_PM -static int ocores_i2c_suspend(struct platform_device *pdev, pm_message_t state) -{ - struct ocores_i2c *i2c = platform_get_drvdata(pdev); - u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL); - - /* make sure the device is disabled */ - oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN)); - - return 0; -} - -static int ocores_i2c_resume(struct platform_device *pdev) -{ - struct ocores_i2c *i2c = platform_get_drvdata(pdev); - - ocores_init(i2c); - - return 0; -} -#else -#define ocores_i2c_suspend NULL -#define ocores_i2c_resume NULL -#endif - -static struct of_device_id ocores_i2c_match[] = { - { .compatible = "opencores,i2c-ocores", }, - {}, -}; -MODULE_DEVICE_TABLE(of, ocores_i2c_match); - -static struct platform_driver ocores_i2c_driver = { - .probe = ocores_i2c_probe, - .remove = __devexit_p(ocores_i2c_remove), - .suspend = ocores_i2c_suspend, - .resume = ocores_i2c_resume, - .driver = { - .owner = THIS_MODULE, - .name = "ocores-i2c", - .of_match_table = ocores_i2c_match, - }, -}; - -module_platform_driver(ocores_i2c_driver); - -MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>"); -MODULE_DESCRIPTION("OpenCores I2C bus driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:ocores-i2c"); |