linux/drivers/reset/sti/reset-stih415.c
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   1/*
   2 * Copyright (C) 2013 STMicroelectronics (R&D) Limited
   3 * Author: Stephen Gallimore <stephen.gallimore@st.com>
   4 * Author: Srinivas Kandagatla <srinivas.kandagatla@st.com>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 */
  11#include <linux/module.h>
  12#include <linux/of.h>
  13#include <linux/of_platform.h>
  14#include <linux/platform_device.h>
  15
  16#include <dt-bindings/reset-controller/stih415-resets.h>
  17
  18#include "reset-syscfg.h"
  19
  20/*
  21 * STiH415 Peripheral powerdown definitions.
  22 */
  23static const char stih415_front[] = "st,stih415-front-syscfg";
  24static const char stih415_rear[] = "st,stih415-rear-syscfg";
  25static const char stih415_sbc[] = "st,stih415-sbc-syscfg";
  26static const char stih415_lpm[] = "st,stih415-lpm-syscfg";
  27
  28#define STIH415_PDN_FRONT(_bit) \
  29        _SYSCFG_RST_CH(stih415_front, SYSCFG_114, _bit, SYSSTAT_187, _bit)
  30
  31#define STIH415_PDN_REAR(_cntl, _stat) \
  32        _SYSCFG_RST_CH(stih415_rear, SYSCFG_336, _cntl, SYSSTAT_384, _stat)
  33
  34#define STIH415_SRST_REAR(_reg, _bit) \
  35        _SYSCFG_RST_CH_NO_ACK(stih415_rear, _reg, _bit)
  36
  37#define STIH415_SRST_SBC(_reg, _bit) \
  38        _SYSCFG_RST_CH_NO_ACK(stih415_sbc, _reg, _bit)
  39
  40#define STIH415_SRST_FRONT(_reg, _bit) \
  41        _SYSCFG_RST_CH_NO_ACK(stih415_front, _reg, _bit)
  42
  43#define STIH415_SRST_LPM(_reg, _bit) \
  44        _SYSCFG_RST_CH_NO_ACK(stih415_lpm, _reg, _bit)
  45
  46#define SYSCFG_114      0x38 /* Powerdown request EMI/NAND/Keyscan */
  47#define SYSSTAT_187     0x15c /* Powerdown status EMI/NAND/Keyscan */
  48
  49#define SYSCFG_336      0x90 /* Powerdown request USB/SATA/PCIe */
  50#define SYSSTAT_384     0x150 /* Powerdown status USB/SATA/PCIe */
  51
  52#define SYSCFG_376      0x130 /* Reset generator 0 control 0 */
  53#define SYSCFG_166      0x108 /* Softreset Ethernet 0 */
  54#define SYSCFG_31       0x7c /* Softreset Ethernet 1 */
  55#define LPM_SYSCFG_1    0x4 /* Softreset IRB */
  56
  57static const struct syscfg_reset_channel_data stih415_powerdowns[] = {
  58        [STIH415_EMISS_POWERDOWN]       = STIH415_PDN_FRONT(0),
  59        [STIH415_NAND_POWERDOWN]        = STIH415_PDN_FRONT(1),
  60        [STIH415_KEYSCAN_POWERDOWN]     = STIH415_PDN_FRONT(2),
  61        [STIH415_USB0_POWERDOWN]        = STIH415_PDN_REAR(0, 0),
  62        [STIH415_USB1_POWERDOWN]        = STIH415_PDN_REAR(1, 1),
  63        [STIH415_USB2_POWERDOWN]        = STIH415_PDN_REAR(2, 2),
  64        [STIH415_SATA0_POWERDOWN]       = STIH415_PDN_REAR(3, 3),
  65        [STIH415_SATA1_POWERDOWN]       = STIH415_PDN_REAR(4, 4),
  66        [STIH415_PCIE_POWERDOWN]        = STIH415_PDN_REAR(5, 8),
  67};
  68
  69static const struct syscfg_reset_channel_data stih415_softresets[] = {
  70        [STIH415_ETH0_SOFTRESET] = STIH415_SRST_FRONT(SYSCFG_166, 0),
  71        [STIH415_ETH1_SOFTRESET] = STIH415_SRST_SBC(SYSCFG_31, 0),
  72        [STIH415_IRB_SOFTRESET]  = STIH415_SRST_LPM(LPM_SYSCFG_1, 6),
  73        [STIH415_USB0_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 9),
  74        [STIH415_USB1_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 10),
  75        [STIH415_USB2_SOFTRESET] = STIH415_SRST_REAR(SYSCFG_376, 11),
  76        [STIH415_KEYSCAN_SOFTRESET] = STIH415_SRST_LPM(LPM_SYSCFG_1, 8),
  77};
  78
  79static struct syscfg_reset_controller_data stih415_powerdown_controller = {
  80        .wait_for_ack = true,
  81        .nr_channels = ARRAY_SIZE(stih415_powerdowns),
  82        .channels = stih415_powerdowns,
  83};
  84
  85static struct syscfg_reset_controller_data stih415_softreset_controller = {
  86        .wait_for_ack = false,
  87        .active_low = true,
  88        .nr_channels = ARRAY_SIZE(stih415_softresets),
  89        .channels = stih415_softresets,
  90};
  91
  92static struct of_device_id stih415_reset_match[] = {
  93        { .compatible = "st,stih415-powerdown",
  94          .data = &stih415_powerdown_controller, },
  95        { .compatible = "st,stih415-softreset",
  96          .data = &stih415_softreset_controller, },
  97        {},
  98};
  99
 100static struct platform_driver stih415_reset_driver = {
 101        .probe = syscfg_reset_probe,
 102        .driver = {
 103                .name = "reset-stih415",
 104                .of_match_table = stih415_reset_match,
 105        },
 106};
 107
 108static int __init stih415_reset_init(void)
 109{
 110        return platform_driver_register(&stih415_reset_driver);
 111}
 112arch_initcall(stih415_reset_init);
 113
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