// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright(c) 2008 - 2010 Realtek Corporation. All rights reserved.
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*
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* Based on the r8180 driver, which is:
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* Copyright 2004-2005 Andrea Merello <andrea.merello@gmail.com>, et al.
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*
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* Contact Information: wlanfae <wlanfae@realtek.com>
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*/
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#include "rtl_core.h"
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#include "rtl_eeprom.h"
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static void _rtl92e_gpio_write_bit(struct net_device *dev, int no, bool val)
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{
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u8 reg = rtl92e_readb(dev, EPROM_CMD);
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if (val)
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reg |= 1 << no;
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else
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reg &= ~(1 << no);
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rtl92e_writeb(dev, EPROM_CMD, reg);
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udelay(EPROM_DELAY);
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}
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static bool _rtl92e_gpio_get_bit(struct net_device *dev, int no)
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{
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u8 reg = rtl92e_readb(dev, EPROM_CMD);
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return (reg >> no) & 0x1;
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}
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static void _rtl92e_eeprom_ck_cycle(struct net_device *dev)
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{
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_rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 1);
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_rtl92e_gpio_write_bit(dev, EPROM_CK_BIT, 0);
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}
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static u16 _rtl92e_eeprom_xfer(struct net_device *dev, u16 data, int tx_len)
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{
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u16 ret = 0;
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int rx_len = 16;
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_rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 1);
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_rtl92e_eeprom_ck_cycle(dev);
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while (tx_len--) {
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_rtl92e_gpio_write_bit(dev, EPROM_W_BIT,
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(data >> tx_len) & 0x1);
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_rtl92e_eeprom_ck_cycle(dev);
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}
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_rtl92e_gpio_write_bit(dev, EPROM_W_BIT, 0);
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while (rx_len--) {
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_rtl92e_eeprom_ck_cycle(dev);
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ret |= _rtl92e_gpio_get_bit(dev, EPROM_R_BIT) << rx_len;
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}
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_rtl92e_gpio_write_bit(dev, EPROM_CS_BIT, 0);
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_rtl92e_eeprom_ck_cycle(dev);
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return ret;
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}
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u32 rtl92e_eeprom_read(struct net_device *dev, u32 addr)
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{
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struct r8192_priv *priv = rtllib_priv(dev);
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u32 ret = 0;
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rtl92e_writeb(dev, EPROM_CMD,
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(EPROM_CMD_PROGRAM << EPROM_CMD_OPERATING_MODE_SHIFT));
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udelay(EPROM_DELAY);
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/* EEPROM is configured as x16 */
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if (priv->epromtype == EEPROM_93C56)
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ret = _rtl92e_eeprom_xfer(dev, (addr & 0xFF) | (0x6 << 8), 11);
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else
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ret = _rtl92e_eeprom_xfer(dev, (addr & 0x3F) | (0x6 << 6), 9);
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rtl92e_writeb(dev, EPROM_CMD,
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(EPROM_CMD_NORMAL<<EPROM_CMD_OPERATING_MODE_SHIFT));
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return ret;
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}
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