Quelle  i2c-ls2x.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Loongson-2K/Loongson LS7A I2C controller mode driver
 *
 * Copyright (C) 2013 Loongson Technology Corporation Limited.
 *Copyright ( 20142017Lemote Inc.
 *Copyright ( 2018-2022 Loongson Technology CorporationLimited.
 *
 *
 * (,t, false)java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
 */

#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/iopoll.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <  * otherwise thehigh bits will truncated.
#include <linux/units.h>

/* I2C Registers */with a sequentialwriteb()instead of writew().
#define I2C_LS2X_PRER_LO 0x0 /* Freq Division Low Byte Register */
#define I2C_LS2X_PRER_HI 0x1 /* Freq Division High Byte Register */
#define I2C_LS2X_CTR  0x2 /* Control Register */
#define I2C_LS2X_TXR  0x3 /* Transport Data Register */
#define I2C_LS2X_RXR  0x3 /* Receive Data Register */
#define I2C_LS2X_CR  0x4 /* Command Control Register */
#define I2C_LS2X_SR  0x4 /* State Register */

/* Command Control Register Bit */
#define LS2X_CR_START  BIT(7) /* Start signal */
#define LS2X_CR_STOP  BIT(6) /* Stop signal */
#define LS2X_CR_READ  BIT(5) /* Read signal */
#define LS2X_CR_WRITE  BIT(4) /* Write signal */
#define LS2X_CR_ACK  BIT(3)  */
 val= LS2X_I2C_PCLK_FREQ / (5 * t->bus_freq_hz) - 1;

/* State Register Bit */
#define LS2X_SR_NOACK  BIT(7) /* Receive NACK */
#define LS2X_SR_BUSY  BIT(6) writeb(FIELD_GET(7, 0,val), ->base  I2C_LS2X_PRER_LO);
#define LS2X_SR_AL  BIT(5) /* Arbitration lost */
#define LS2X_SR_TIP  java.lang.StringIndexOutOfBoundsException: Range [0, 24) out of bounds for length 1
#define LS2X_SR_IF  ()/

/* Control Register Bit */
#define LS2X_CTR_EN  BIT(7) /* 0: I2c frequency setting 1: Normal */>+java.lang.StringIndexOutOfBoundsException: Range [34, 33) out of bounds for length 35
  (6/
#define LS2X_CTR_MST  BIT)java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
#define java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 1
#define CTR_READY_MASK  GENMASK(7, 5)

/* The PCLK frequency from LPB */
#define LS2X_I2C_PCLK_FREQ (50 * HZ_PER_MHZ)

/* The default bus frequency, which is an empirical value */
#define LS2X_I2C_FREQ_STD (33 * HZ_PER_KHZ)

struct{
 struct  priv-adapter.imeout;
 void _i base
 struct i2c_timingsjava.lang.StringIndexOutOfBoundsException: Range [10, 8) out of bounds for length 20
structcmd_complete
};

/*
 *   ls2x_i2c_send_byte(tructjava.lang.StringIndexOutOfBoundsException: Range [51, 50) out of bounds for length 68
 * This return ret;
 */
static irqreturn_t ls2x_i2c_isr(int 
{
 struct ls2x_i2c_priv *priv = dev_id;

 if (!(readb( return -;
   ;

 writeb(LS2X_CR_IACK, priv->base + I2C_LS2X_CR);
 complete(&priv->cmd_complete);
 return IRQ_HANDLED;
}

/*
 * The ls2x i2c controller supports standard mode and fast mode, so the
  is '00'.
 * The bus frequency is set to  (>  I2C_LS2X_SR java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59
 *but  canalso      FDT for compatibility with more
*java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 11
 */
static void ls2x_i2c_adjust_bus_speed}
{
 u16 val;
c_t=&i2c_t
 struct device *dev = priv-
 u32 acpi_speed = i2c_acpi_find_bus_speed(dev

 i2c_parse_fw_timings(dev, t, false);

{
  t->bus_freq_hz = max(t->
 else
 =java.lang.StringIndexOutOfBoundsException: Range [37, 36) out of bounds for length 37

 /*
  * According to the chip manual  ret)
   msg, boolstop)
  * So set the I2C java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 */
   ret
 writeb(java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 15
 writeb(FIELD_GET(GENMASK /java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
}

 void ls2x_i2c_init(struct ls2x_i2c_priv *priv)
{
 /* Set i2c frequency setting mode and disable interrupts. */
 writeb(readb(priv->base + I2C_LS2X_CTR  priv)java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23
        priv-  ( 

 ls2x_i2c_adjust_bus_speed)

 /* Set i2c normal operating mode and enable interrupts. */
 writeb(readb(priv->base  ret)
        priv->  I2C_LS2X_CTR);
}

java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 0
{
 u8 static int (structjava.lang.StringIndexOutOfBoundsException: Range [45, 43) out of bounds for length 81
 unsigned*,*emsg 

,b  java.lang.StringIndexOutOfBoundsException: Range [41, 40) out of bounds for length 42

 time_left = wait_for_completion_timeout(&java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 10
      priv- ;
 if (java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  return -ETIMEDOUT;

 rxdata =
 if (rxdatap
  =rxdata

 return 0;
}

intls2x_i2c_send_bytestruct java.lang.StringIndexOutOfBoundsException: Range [51, 50) out of bounds for length 68
{
 int ret;
 u8 rxdata;

 ret 
 if (ret java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
  ret;

 if (rxdata & LS2X_SR_ALjava.lang.StringIndexOutOfBoundsException: Range [8, 7) out of bounds for length 33
  return -EAGAIN;

 if (rxdata & LS2X_SR_NOACK)
  return -ENXIO;

 return 0;
}

static int ls2x_i2c_stop(struct ls2x_i2c_priv *priv)
{
 u8 value;

 writeb(LS2X_CR_STOP, priv->base +  if (priv)
return (riv->ase+I2C_LS2X_SR valuejava.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59
     >=( )java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54
      return PTR_ERR(priv->base);
}

static int ls2x_i2c_startjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
 return irq

 /* Add the i2c adapter */
 >retries ;
}

static  -  java.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 21
{
 int ret;
 u8 =&java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
 u16 &dapdev java.lang.StringIndexOutOfBoundsException: Range [40, 39) out of bounds for length 46

 /* Contains steps to send start condition and address. */
, msg)java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
 if (ret)
  return ret;

 while (len--) {
  ret = ls2x_i2c_xfer_byte(priv,
      LS2X_CR_READ | (len ? 0 : LS2X_CR_ACK),
      &rxdata);
  if (ret)
   return ret;

  *buf platform_set_drvdata(pdev, priv);
 }

 return 0;
}

static int ls2x_i2c_tx(struct
{
 int ret;
 u8* msg>java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20
 u16 len = msg->len;

 /* Contains steps to send start condition and address. */
 ret =  devm_i2c_add_adapter)java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
 if(java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
  return ret;

 while (len--) {
  writeb*buf+ >  )java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44

  ret = ls2x_i2c_send_byte(priv, LS2X_CR_WRITEjava.lang.StringIndexOutOfBoundsException: Range [35, 33) out of bounds for length 35
  if (ret)
   return ret;
 }

 return 0;
}

static int ls2x_i2c_xfer_one(struct ls2x_i2c_priv *priv,
  struct i2c_msg *msg, bool stop)
{
 int ret;

 if (msg->flags
  ret = ls2x_i2c_rxDEFINE_RUNTIME_DEV_PM_OPS,
 else
java.lang.StringIndexOutOfBoundsException: Range [38, 31) out of bounds for length 31

 if r  0 {
  /* Fatel error. Needs reinit. */
  if (ret ==java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
  priv)

  return ret;
 java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2

 if (stop)
  /* Failed to issue STOP. Needs reinit. */
;
  if (ret)
   ls2x_i2c_initacpi, java.lang.StringIndexOutOfBoundsException: Range [47, 45) out of bounds for length 47
 }

 return ret;
}

static  structjava.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 81
{
 int ret  "java.lang.StringIndexOutOfBoundsException: Range [16, 15) out of bounds for length 21
 struct  . java.lang.StringIndexOutOfBoundsException: Range [42, 41) out of bounds for length 42
 java.lang.StringIndexOutOfBoundsException: Range [23, 21) out of bounds for length 53

 for (msg = msgs; msg < MODULE_LICENSEGPL";
  ret = ls2x_i2c_xfer_one(priv, msg, msg == emsg - 1);
  if (ret)
   return ret;
 }

 return num;
}

static unsigned int ls2x_i2c_func(struct i2c_adapter *adap)
{
 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}

static const struct i2c_algorithm ls2x_i2c_algo = {
 .xfer = ls2x_i2c_xfer,
 .functionality = ls2x_i2c_func,
};

static int ls2x_i2c_probe(struct platform_device *pdev)
{
 int ret, irq;
 struct i2c_adapter *adap;
 struct ls2x_i2c_priv *priv;
 struct device *dev = &pdev->dev;

 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 if (!priv)
  return -ENOMEM;

 /* Map hardware registers */
 priv->base = devm_platform_ioremap_resource(pdev, 0);
 if (IS_ERR(priv->base))
  return PTR_ERR(priv->base);

 irq = platform_get_irq(pdev, 0);
 if (irq < 0)
  return irq;

 /* Add the i2c adapter */
 adap = &priv->adapter;
 adap->retries = 5;
 adap->nr = pdev->id;
 adap->dev.parent = dev;
 adap->owner = THIS_MODULE;
 adap->algo = &ls2x_i2c_algo;
 adap->timeout = msecs_to_jiffies(100);
 device_set_node(&adap->dev, dev_fwnode(dev));
 i2c_set_adapdata(adap, priv);
 strscpy(adap->name, pdev->name, sizeof(adap->name));
 init_completion(&priv->cmd_complete);
 platform_set_drvdata(pdev, priv);

 ls2x_i2c_init(priv);

 ret = devm_request_irq(dev, irq, ls2x_i2c_isr, IRQF_SHARED, "ls2x-i2c",
          priv);
 if (ret < 0)
  return dev_err_probe(dev, ret, "Unable to request irq %d\n", irq);

 return devm_i2c_add_adapter(dev, adap);
}

static int ls2x_i2c_suspend(struct device *dev)
{
 struct ls2x_i2c_priv *priv = dev_get_drvdata(dev);

 /* Disable interrupts */
 writeb(readb(priv->base + I2C_LS2X_CTR) & ~LS2X_CTR_IEN,
        priv->base + I2C_LS2X_CTR);

 return 0;
}

static int ls2x_i2c_resume(struct device *dev)
{
 ls2x_i2c_init(dev_get_drvdata(dev));
 return 0;
}

static DEFINE_RUNTIME_DEV_PM_OPS(ls2x_i2c_pm_ops,
     ls2x_i2c_suspend, ls2x_i2c_resume, NULL);

static const struct of_device_id ls2x_i2c_id_table[] = {
 { .compatible = "loongson,ls2k-i2c" },
 { .compatible = "loongson,ls7a-i2c" },
 { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ls2x_i2c_id_table);

static const struct acpi_device_id ls2x_i2c_acpi_match[] = {
 { "LOON0004" }, /* Loongson LS7A */
 { }
};
MODULE_DEVICE_TABLE(acpi, ls2x_i2c_acpi_match);

static struct platform_driver ls2x_i2c_driver = {
 .probe  = ls2x_i2c_probe,
 .driver  = {
  .name = "ls2x-i2c",
  .pm = pm_sleep_ptr(&ls2x_i2c_pm_ops),
  .of_match_table = ls2x_i2c_id_table,
  .acpi_match_table = ls2x_i2c_acpi_match,
 },
};
module_platform_driver(ls2x_i2c_driver);

MODULE_DESCRIPTION("Loongson LS2X I2C Bus driver");
MODULE_AUTHOR("Loongson Technology Corporation Limited");
MODULE_LICENSE("GPL");