linux/drivers/reset/sti/reset-stih416.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/stih416-resets.h>
  17
  18#include "reset-syscfg.h"
  19
  20/*
  21 * STiH416 Peripheral powerdown definitions.
  22 */
  23static const char stih416_front[] = "st,stih416-front-syscfg";
  24static const char stih416_rear[] = "st,stih416-rear-syscfg";
  25static const char stih416_sbc[] = "st,stih416-sbc-syscfg";
  26static const char stih416_lpm[] = "st,stih416-lpm-syscfg";
  27static const char stih416_cpu[] = "st,stih416-cpu-syscfg";
  28
  29#define STIH416_PDN_FRONT(_bit) \
  30        _SYSCFG_RST_CH(stih416_front, SYSCFG_1500, _bit, SYSSTAT_1578, _bit)
  31
  32#define STIH416_PDN_REAR(_cntl, _stat) \
  33        _SYSCFG_RST_CH(stih416_rear, SYSCFG_2525, _cntl, SYSSTAT_2583, _stat)
  34
  35#define SYSCFG_1500     0x7d0 /* Powerdown request EMI/NAND/Keyscan */
  36#define SYSSTAT_1578    0x908 /* Powerdown status EMI/NAND/Keyscan */
  37
  38#define SYSCFG_2525     0x834 /* Powerdown request USB/SATA/PCIe */
  39#define SYSSTAT_2583    0x91c /* Powerdown status USB/SATA/PCIe */
  40
  41#define SYSCFG_2552     0x8A0 /* Reset Generator control 0 */
  42#define SYSCFG_1539     0x86c /* Softreset Ethernet 0 */
  43#define SYSCFG_510      0x7f8 /* Softreset Ethernet 1 */
  44#define LPM_SYSCFG_1    0x4 /* Softreset IRB */
  45#define SYSCFG_2553     0x8a4 /* Softreset SATA0/1, PCIE0/1 */
  46#define SYSCFG_7563     0x8cc /* MPE softresets 0 */
  47#define SYSCFG_7564     0x8d0 /* MPE softresets 1 */
  48
  49#define STIH416_SRST_CPU(_reg, _bit) \
  50         _SYSCFG_RST_CH_NO_ACK(stih416_cpu, _reg, _bit)
  51
  52#define STIH416_SRST_FRONT(_reg, _bit) \
  53         _SYSCFG_RST_CH_NO_ACK(stih416_front, _reg, _bit)
  54
  55#define STIH416_SRST_REAR(_reg, _bit) \
  56         _SYSCFG_RST_CH_NO_ACK(stih416_rear, _reg, _bit)
  57
  58#define STIH416_SRST_LPM(_reg, _bit) \
  59         _SYSCFG_RST_CH_NO_ACK(stih416_lpm, _reg, _bit)
  60
  61#define STIH416_SRST_SBC(_reg, _bit) \
  62         _SYSCFG_RST_CH_NO_ACK(stih416_sbc, _reg, _bit)
  63
  64static const struct syscfg_reset_channel_data stih416_powerdowns[] = {
  65        [STIH416_EMISS_POWERDOWN]       = STIH416_PDN_FRONT(0),
  66        [STIH416_NAND_POWERDOWN]        = STIH416_PDN_FRONT(1),
  67        [STIH416_KEYSCAN_POWERDOWN]     = STIH416_PDN_FRONT(2),
  68        [STIH416_USB0_POWERDOWN]        = STIH416_PDN_REAR(0, 0),
  69        [STIH416_USB1_POWERDOWN]        = STIH416_PDN_REAR(1, 1),
  70        [STIH416_USB2_POWERDOWN]        = STIH416_PDN_REAR(2, 2),
  71        [STIH416_USB3_POWERDOWN]        = STIH416_PDN_REAR(6, 5),
  72        [STIH416_SATA0_POWERDOWN]       = STIH416_PDN_REAR(3, 3),
  73        [STIH416_SATA1_POWERDOWN]       = STIH416_PDN_REAR(4, 4),
  74        [STIH416_PCIE0_POWERDOWN]       = STIH416_PDN_REAR(7, 9),
  75        [STIH416_PCIE1_POWERDOWN]       = STIH416_PDN_REAR(5, 8),
  76};
  77
  78static const struct syscfg_reset_channel_data stih416_softresets[] = {
  79        [STIH416_ETH0_SOFTRESET] = STIH416_SRST_FRONT(SYSCFG_1539, 0),
  80        [STIH416_ETH1_SOFTRESET] = STIH416_SRST_SBC(SYSCFG_510, 0),
  81        [STIH416_IRB_SOFTRESET]  = STIH416_SRST_LPM(LPM_SYSCFG_1, 6),
  82        [STIH416_USB0_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 9),
  83        [STIH416_USB1_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 10),
  84        [STIH416_USB2_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 11),
  85        [STIH416_USB3_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 28),
  86        [STIH416_SATA0_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 7),
  87        [STIH416_SATA1_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 3),
  88        [STIH416_PCIE0_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 15),
  89        [STIH416_PCIE1_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 2),
  90        [STIH416_AUD_DAC_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 14),
  91        [STIH416_HDTVOUT_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 5),
  92        [STIH416_VTAC_M_RX_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 25),
  93        [STIH416_VTAC_A_RX_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2552, 26),
  94        [STIH416_SYNC_HD_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 5),
  95        [STIH416_SYNC_SD_SOFTRESET] = STIH416_SRST_REAR(SYSCFG_2553, 6),
  96        [STIH416_BLITTER_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 10),
  97        [STIH416_GPU_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 11),
  98        [STIH416_VTAC_M_TX_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 18),
  99        [STIH416_VTAC_A_TX_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 19),
 100        [STIH416_VTG_AUX_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 21),
 101        [STIH416_JPEG_DEC_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7563, 23),
 102        [STIH416_HVA_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 2),
 103        [STIH416_COMPO_M_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 3),
 104        [STIH416_COMPO_A_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 4),
 105        [STIH416_VP8_DEC_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 10),
 106        [STIH416_VTG_MAIN_SOFTRESET] = STIH416_SRST_CPU(SYSCFG_7564, 16),
 107        [STIH416_KEYSCAN_SOFTRESET] = STIH416_SRST_LPM(LPM_SYSCFG_1, 8),
 108};
 109
 110static struct syscfg_reset_controller_data stih416_powerdown_controller = {
 111        .wait_for_ack   = true,
 112        .nr_channels    = ARRAY_SIZE(stih416_powerdowns),
 113        .channels       = stih416_powerdowns,
 114};
 115
 116static struct syscfg_reset_controller_data stih416_softreset_controller = {
 117        .wait_for_ack = false,
 118        .active_low = true,
 119        .nr_channels = ARRAY_SIZE(stih416_softresets),
 120        .channels = stih416_softresets,
 121};
 122
 123static struct of_device_id stih416_reset_match[] = {
 124        { .compatible = "st,stih416-powerdown",
 125          .data = &stih416_powerdown_controller, },
 126        { .compatible = "st,stih416-softreset",
 127          .data = &stih416_softreset_controller, },
 128        {},
 129};
 130
 131static struct platform_driver stih416_reset_driver = {
 132        .probe = syscfg_reset_probe,
 133        .driver = {
 134                .name = "reset-stih416",
 135                .of_match_table = stih416_reset_match,
 136        },
 137};
 138
 139static int __init stih416_reset_init(void)
 140{
 141        return platform_driver_register(&stih416_reset_driver);
 142}
 143arch_initcall(stih416_reset_init);
 144
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