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 } 85