1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright(c) 2008 - 2010 Realtek Corporation. All rights reserved.
5 * Based on the r8180 driver, which is:
6 * Copyright 2004-2005 Andrea Merello <andrea.merello@gmail.com>, et al.
8 * Contact Information: wlanfae <wlanfae@realtek.com>
11 #include "rtl_eeprom.h"
13 static void _rtl92e_gpio_write_bit(struct net_device *dev, int no, bool val)
15 u8 reg = rtl92e_readb(dev, EPROM_CMD);
22 rtl92e_writeb(dev, EPROM_CMD, reg);
26 static bool _rtl92e_gpio_get_bit(struct net_device *dev, int no)
28 u8 reg = rtl92e_readb(dev, EPROM_CMD);
30 return (reg >> no) & 0x1;
33 static void _rtl92e_eeprom_ck_cycle(struct net_device *dev)
35 _rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 1);
36 _rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 0);
39 static u16 _rtl92e_eeprom_xfer(struct net_device *dev, u16 data, int tx_len)
44 _rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 1);
45 _rtl92e_eeprom_ck_cycle(dev);
48 _rtl92e_gpio_write_bit(dev, EPROM_W_BIT,
49 (data >> tx_len) & 0x1);
50 _rtl92e_eeprom_ck_cycle(dev);
53 _rtl92e_gpio_write_bit(dev, EPROM_W_BIT, 0);
56 _rtl92e_eeprom_ck_cycle(dev);
57 ret |= _rtl92e_gpio_get_bit(dev, EPROM_R_BIT) << rx_len;
60 _rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 0);
61 _rtl92e_eeprom_ck_cycle(dev);
66 u32 rtl92e_eeprom_read(struct net_device *dev, u32 addr)
68 struct r8192_priv *priv = rtllib_priv(dev);
71 rtl92e_writeb(dev, EPROM_CMD,
72 (EPROM_CMD_PROGRAM << EPROM_CMD_OPERATING_MODE_SHIFT));
75 /* EEPROM is configured as x16 */
76 if (priv->epromtype == EEPROM_93C56)
77 ret = _rtl92e_eeprom_xfer(dev, (addr & 0xFF) | (0x6 << 8), 11);
79 ret = _rtl92e_eeprom_xfer(dev, (addr & 0x3F) | (0x6 << 6), 9);
81 rtl92e_writeb(dev, EPROM_CMD,
82 (EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));