// SPDX-License-Identifier: GPL-2.0
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/******************************************************************************
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* rtl871x_eeprom.c
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*
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* Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
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* Linux device driver for RTL8192SU
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*
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* Modifications for inclusion into the Linux staging tree are
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* Copyright(c) 2010 Larry Finger. All rights reserved.
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*
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* Contact information:
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* WLAN FAE <wlanfae@realtek.com>
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* Larry Finger <Larry.Finger@lwfinger.net>
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*
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******************************************************************************/
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#define _RTL871X_EEPROM_C_
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#include "osdep_service.h"
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#include "drv_types.h"
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static void up_clk(struct _adapter *padapter, u16 *x)
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{
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*x = *x | _EESK;
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r8712_write8(padapter, EE_9346CR, (u8)*x);
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udelay(CLOCK_RATE);
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}
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static void down_clk(struct _adapter *padapter, u16 *x)
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{
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*x = *x & ~_EESK;
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r8712_write8(padapter, EE_9346CR, (u8)*x);
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udelay(CLOCK_RATE);
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}
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static void shift_out_bits(struct _adapter *padapter, u16 data, u16 count)
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{
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u16 x, mask;
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if (padapter->surprise_removed)
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goto out;
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mask = 0x01 << (count - 1);
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x = r8712_read8(padapter, EE_9346CR);
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x &= ~(_EEDO | _EEDI);
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do {
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x &= ~_EEDI;
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if (data & mask)
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x |= _EEDI;
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if (padapter->surprise_removed)
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goto out;
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r8712_write8(padapter, EE_9346CR, (u8)x);
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udelay(CLOCK_RATE);
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up_clk(padapter, &x);
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down_clk(padapter, &x);
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mask >>= 1;
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} while (mask);
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if (padapter->surprise_removed)
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goto out;
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x &= ~_EEDI;
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r8712_write8(padapter, EE_9346CR, (u8)x);
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out:;
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}
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static u16 shift_in_bits(struct _adapter *padapter)
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{
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u16 x, d = 0, i;
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if (padapter->surprise_removed)
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goto out;
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x = r8712_read8(padapter, EE_9346CR);
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x &= ~(_EEDO | _EEDI);
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d = 0;
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for (i = 0; i < 16; i++) {
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d <<= 1;
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up_clk(padapter, &x);
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if (padapter->surprise_removed)
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goto out;
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x = r8712_read8(padapter, EE_9346CR);
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x &= ~(_EEDI);
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if (x & _EEDO)
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d |= 1;
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down_clk(padapter, &x);
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}
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out:
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return d;
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}
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static void standby(struct _adapter *padapter)
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{
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u8 x;
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x = r8712_read8(padapter, EE_9346CR);
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x &= ~(_EECS | _EESK);
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r8712_write8(padapter, EE_9346CR, x);
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udelay(CLOCK_RATE);
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x |= _EECS;
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r8712_write8(padapter, EE_9346CR, x);
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udelay(CLOCK_RATE);
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}
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static u16 wait_eeprom_cmd_done(struct _adapter *padapter)
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{
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u8 x;
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u16 i;
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standby(padapter);
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for (i = 0; i < 200; i++) {
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x = r8712_read8(padapter, EE_9346CR);
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if (x & _EEDO)
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return true;
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udelay(CLOCK_RATE);
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}
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return false;
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}
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static void eeprom_clean(struct _adapter *padapter)
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{
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u16 x;
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if (padapter->surprise_removed)
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return;
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x = r8712_read8(padapter, EE_9346CR);
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if (padapter->surprise_removed)
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return;
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x &= ~(_EECS | _EEDI);
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r8712_write8(padapter, EE_9346CR, (u8)x);
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if (padapter->surprise_removed)
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return;
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up_clk(padapter, &x);
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if (padapter->surprise_removed)
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return;
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down_clk(padapter, &x);
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}
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void r8712_eeprom_write16(struct _adapter *padapter, u16 reg, u16 data)
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{
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u8 x;
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u8 tmp8_ori, tmp8_new, tmp8_clk_ori, tmp8_clk_new;
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tmp8_ori = r8712_read8(padapter, 0x102502f1);
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tmp8_new = tmp8_ori & 0xf7;
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if (tmp8_ori != tmp8_new)
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r8712_write8(padapter, 0x102502f1, tmp8_new);
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tmp8_clk_ori = r8712_read8(padapter, 0x10250003);
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tmp8_clk_new = tmp8_clk_ori | 0x20;
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if (tmp8_clk_new != tmp8_clk_ori)
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r8712_write8(padapter, 0x10250003, tmp8_clk_new);
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x = r8712_read8(padapter, EE_9346CR);
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x &= ~(_EEDI | _EEDO | _EESK | _EEM0);
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x |= _EEM1 | _EECS;
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r8712_write8(padapter, EE_9346CR, x);
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shift_out_bits(padapter, EEPROM_EWEN_OPCODE, 5);
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if (padapter->eeprom_address_size == 8) /*CF+ and SDIO*/
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shift_out_bits(padapter, 0, 6);
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else /* USB */
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shift_out_bits(padapter, 0, 4);
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standby(padapter);
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/* Erase this particular word. Write the erase opcode and register
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* number in that order. The opcode is 3bits in length; reg is 6
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* bits long.
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*/
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standby(padapter);
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/* write the new word to the EEPROM
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* send the write opcode the EEPORM
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*/
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shift_out_bits(padapter, EEPROM_WRITE_OPCODE, 3);
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/* select which word in the EEPROM that we are writing to. */
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shift_out_bits(padapter, reg, padapter->eeprom_address_size);
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/* write the data to the selected EEPROM word. */
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shift_out_bits(padapter, data, 16);
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if (wait_eeprom_cmd_done(padapter)) {
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standby(padapter);
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shift_out_bits(padapter, EEPROM_EWDS_OPCODE, 5);
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shift_out_bits(padapter, reg, 4);
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eeprom_clean(padapter);
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}
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if (tmp8_clk_new != tmp8_clk_ori)
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r8712_write8(padapter, 0x10250003, tmp8_clk_ori);
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if (tmp8_new != tmp8_ori)
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r8712_write8(padapter, 0x102502f1, tmp8_ori);
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}
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u16 r8712_eeprom_read16(struct _adapter *padapter, u16 reg) /*ReadEEprom*/
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{
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u16 x;
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u16 data = 0;
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u8 tmp8_ori, tmp8_new, tmp8_clk_ori, tmp8_clk_new;
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tmp8_ori = r8712_read8(padapter, 0x102502f1);
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tmp8_new = tmp8_ori & 0xf7;
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if (tmp8_ori != tmp8_new)
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r8712_write8(padapter, 0x102502f1, tmp8_new);
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tmp8_clk_ori = r8712_read8(padapter, 0x10250003);
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tmp8_clk_new = tmp8_clk_ori | 0x20;
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if (tmp8_clk_new != tmp8_clk_ori)
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r8712_write8(padapter, 0x10250003, tmp8_clk_new);
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if (padapter->surprise_removed)
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goto out;
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/* select EEPROM, reset bits, set _EECS */
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x = r8712_read8(padapter, EE_9346CR);
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if (padapter->surprise_removed)
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goto out;
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x &= ~(_EEDI | _EEDO | _EESK | _EEM0);
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x |= _EEM1 | _EECS;
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r8712_write8(padapter, EE_9346CR, (unsigned char)x);
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/* write the read opcode and register number in that order
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* The opcode is 3bits in length, reg is 6 bits long
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*/
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shift_out_bits(padapter, EEPROM_READ_OPCODE, 3);
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shift_out_bits(padapter, reg, padapter->eeprom_address_size);
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/* Now read the data (16 bits) in from the selected EEPROM word */
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data = shift_in_bits(padapter);
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eeprom_clean(padapter);
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out:
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if (tmp8_clk_new != tmp8_clk_ori)
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r8712_write8(padapter, 0x10250003, tmp8_clk_ori);
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if (tmp8_new != tmp8_ori)
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r8712_write8(padapter, 0x102502f1, tmp8_ori);
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return data;
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}
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