root/drivers/staging/rtl8192e/rtl8192e/rtl_eeprom.c

DEFINITIONS

1. _rtl92e_gpio_write_bit
2. _rtl92e_gpio_get_bit
3. _rtl92e_eeprom_ck_cycle
4. _rtl92e_eeprom_xfer
5. rtl92e_eeprom_read

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright(c) 2008 - 2010 Realtek Corporation. All rights reserved.
   4  *
   5  * Based on the r8180 driver, which is:
   6  * Copyright 2004-2005 Andrea Merello <andrea.merello@gmail.com>, et al.
   7  *
   8  * Contact Information: wlanfae <wlanfae@realtek.com>
   9  */
  10 #include "rtl_core.h"
  11 #include "rtl_eeprom.h"
  12 
  13 static void _rtl92e_gpio_write_bit(struct net_device *dev, int no, bool val)
  14 {
  15         u8 reg = rtl92e_readb(dev, EPROM_CMD);
  16 
  17         if (val)
  18                 reg |= 1 << no;
  19         else
  20                 reg &= ~(1 << no);
  21 
  22         rtl92e_writeb(dev, EPROM_CMD, reg);
  23         udelay(EPROM_DELAY);
  24 }
  25 
  26 static bool _rtl92e_gpio_get_bit(struct net_device *dev, int no)
  27 {
  28         u8 reg = rtl92e_readb(dev, EPROM_CMD);
  29 
  30         return (reg >> no) & 0x1;
  31 }
  32 
  33 static void _rtl92e_eeprom_ck_cycle(struct net_device *dev)
  34 {
  35         _rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 1);
  36         _rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 0);
  37 }
  38 
  39 static u16 _rtl92e_eeprom_xfer(struct net_device *dev, u16 data, int tx_len)
  40 {
  41         u16 ret = 0;
  42         int rx_len = 16;
  43 
  44         _rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 1);
  45         _rtl92e_eeprom_ck_cycle(dev);
  46 
  47         while (tx_len--) {
  48                 _rtl92e_gpio_write_bit(dev, EPROM_W_BIT,
  49                                        (data >> tx_len) & 0x1);
  50                 _rtl92e_eeprom_ck_cycle(dev);
  51         }
  52 
  53         _rtl92e_gpio_write_bit(dev, EPROM_W_BIT, 0);
  54 
  55         while (rx_len--) {
  56                 _rtl92e_eeprom_ck_cycle(dev);
  57                 ret |= _rtl92e_gpio_get_bit(dev, EPROM_R_BIT) << rx_len;
  58         }
  59 
  60         _rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 0);
  61         _rtl92e_eeprom_ck_cycle(dev);
  62 
  63         return ret;
  64 }
  65 
  66 u32 rtl92e_eeprom_read(struct net_device *dev, u32 addr)
  67 {
  68         struct r8192_priv *priv = rtllib_priv(dev);
  69         u32 ret = 0;
  70 
  71         rtl92e_writeb(dev, EPROM_CMD,
  72                       (EPROM_CMD_PROGRAM << EPROM_CMD_OPERATING_MODE_SHIFT));
  73         udelay(EPROM_DELAY);
  74 
  75         /* EEPROM is configured as x16 */
  76         if (priv->epromtype == EEPROM_93C56)
  77                 ret = _rtl92e_eeprom_xfer(dev, (addr & 0xFF) | (0x6 << 8), 11);
  78         else
  79                 ret = _rtl92e_eeprom_xfer(dev, (addr & 0x3F) | (0x6 << 6), 9);
  80 
  81         rtl92e_writeb(dev, EPROM_CMD,
  82                       (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
  83         return ret;
  84 }