kernel/drivers/reset/sti/reset-stih407.c

   1 /*
   2  * Copyright (C) 2014 STMicroelectronics (R&D) Limited
   3  * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/of_platform.h>
  13 #include <linux/platform_device.h>
  14 #include <dt-bindings/reset-controller/stih407-resets.h>
  15 #include "reset-syscfg.h"
  16
  17 /* STiH407 Peripheral powerdown definitions. */
  18 static const char stih407_core[] = "st,stih407-core-syscfg";
  19 static const char stih407_sbc_reg[] = "st,stih407-sbc-reg-syscfg";
  20 static const char stih407_lpm[] = "st,stih407-lpm-syscfg";
  21
  22 #define STIH407_PDN_0(_bit) \
  23         _SYSCFG_RST_CH(stih407_core, SYSCFG_5000, _bit, SYSSTAT_5500, _bit)
  24 #define STIH407_PDN_1(_bit) \
  25         _SYSCFG_RST_CH(stih407_core, SYSCFG_5001, _bit, SYSSTAT_5501, _bit)
  26 #define STIH407_PDN_ETH(_bit, _stat) \
  27         _SYSCFG_RST_CH(stih407_sbc_reg, SYSCFG_4032, _bit, SYSSTAT_4520, _stat)
  28
  29 /* Powerdown requests control 0 */
  30 #define SYSCFG_5000     0x0
  31 #define SYSSTAT_5500    0x7d0
  32 /* Powerdown requests control 1 (High Speed Links) */
  33 #define SYSCFG_5001     0x4
  34 #define SYSSTAT_5501    0x7d4
  35
  36 /* Ethernet powerdown/status/reset */
  37 #define SYSCFG_4032     0x80
  38 #define SYSSTAT_4520    0x820
  39 #define SYSCFG_4002     0x8
  40
  41 static const struct syscfg_reset_channel_data stih407_powerdowns[] = {
  42         [STIH407_EMISS_POWERDOWN] = STIH407_PDN_0(1),
  43         [STIH407_NAND_POWERDOWN] = STIH407_PDN_0(0),
  44         [STIH407_USB3_POWERDOWN] = STIH407_PDN_1(6),
  45         [STIH407_USB2_PORT1_POWERDOWN] = STIH407_PDN_1(5),
  46         [STIH407_USB2_PORT0_POWERDOWN] = STIH407_PDN_1(4),
  47         [STIH407_PCIE1_POWERDOWN] = STIH407_PDN_1(3),
  48         [STIH407_PCIE0_POWERDOWN] = STIH407_PDN_1(2),
  49         [STIH407_SATA1_POWERDOWN] = STIH407_PDN_1(1),
  50         [STIH407_SATA0_POWERDOWN] = STIH407_PDN_1(0),
  51         [STIH407_ETH1_POWERDOWN] = STIH407_PDN_ETH(0, 2),
  52 };
  53
  54 /* Reset Generator control 0/1 */
  55 #define SYSCFG_5131     0x20c
  56 #define SYSCFG_5132     0x210
  57
  58 #define LPM_SYSCFG_1    0x4     /* Softreset IRB & SBC UART */
  59
  60 #define STIH407_SRST_CORE(_reg, _bit) \
  61         _SYSCFG_RST_CH_NO_ACK(stih407_core, _reg, _bit)
  62
  63 #define STIH407_SRST_SBC(_reg, _bit) \
  64         _SYSCFG_RST_CH_NO_ACK(stih407_sbc_reg, _reg, _bit)
  65
  66 #define STIH407_SRST_LPM(_reg, _bit) \
  67         _SYSCFG_RST_CH_NO_ACK(stih407_lpm, _reg, _bit)
  68
  69 static const struct syscfg_reset_channel_data stih407_softresets[] = {
  70         [STIH407_ETH1_SOFTRESET] = STIH407_SRST_SBC(SYSCFG_4002, 4),
  71         [STIH407_MMC1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 3),
  72         [STIH407_USB2_PORT0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 28),
  73         [STIH407_USB2_PORT1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 29),
  74         [STIH407_PICOPHY_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 30),
  75         [STIH407_IRB_SOFTRESET] = STIH407_SRST_LPM(LPM_SYSCFG_1, 6),
  76         [STIH407_PCIE0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 6),
  77         [STIH407_PCIE1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 15),
  78         [STIH407_SATA0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 7),
  79         [STIH407_SATA1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 16),
  80         [STIH407_MIPHY0_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 4),
  81         [STIH407_MIPHY1_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 13),
  82         [STIH407_MIPHY2_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 22),
  83         [STIH407_SATA0_PWR_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 5),
  84         [STIH407_SATA1_PWR_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 14),
  85         [STIH407_DELTA_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 3),
  86         [STIH407_BLITTER_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 10),
  87         [STIH407_HDTVOUT_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 11),
  88         [STIH407_HDQVDP_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 12),
  89         [STIH407_VDP_AUX_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 14),
  90         [STIH407_COMPO_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 15),
  91         [STIH407_HDMI_TX_PHY_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 21),
  92         [STIH407_JPEG_DEC_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 23),
  93         [STIH407_VP8_DEC_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 24),
  94         [STIH407_GPU_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5131, 30),
  95         [STIH407_HVA_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 0),
  96         [STIH407_ERAM_HVA_SOFTRESET] = STIH407_SRST_CORE(SYSCFG_5132, 1),
  97         [STIH407_LPM_SOFTRESET] = STIH407_SRST_SBC(SYSCFG_4002, 2),
  98         [STIH407_KEYSCAN_SOFTRESET] = STIH407_SRST_LPM(LPM_SYSCFG_1, 8),
  99 };
 100
 101 /* PicoPHY reset/control */
 102 #define SYSCFG_5061     0x0f4
 103
 104 static const struct syscfg_reset_channel_data stih407_picophyresets[] = {
 105         [STIH407_PICOPHY0_RESET] = STIH407_SRST_CORE(SYSCFG_5061, 5),
 106         [STIH407_PICOPHY1_RESET] = STIH407_SRST_CORE(SYSCFG_5061, 6),
 107         [STIH407_PICOPHY2_RESET] = STIH407_SRST_CORE(SYSCFG_5061, 7),
 108 };
 109
 110 static const struct syscfg_reset_controller_data stih407_powerdown_controller = {
 111         .wait_for_ack = true,
 112         .nr_channels = ARRAY_SIZE(stih407_powerdowns),
 113         .channels = stih407_powerdowns,
 114 };
 115
 116 static const struct syscfg_reset_controller_data stih407_softreset_controller = {
 117         .wait_for_ack = false,
 118         .active_low = true,
 119         .nr_channels = ARRAY_SIZE(stih407_softresets),
 120         .channels = stih407_softresets,
 121 };
 122
 123 static const struct syscfg_reset_controller_data stih407_picophyreset_controller = {
 124         .wait_for_ack = false,
 125         .nr_channels = ARRAY_SIZE(stih407_picophyresets),
 126         .channels = stih407_picophyresets,
 127 };
 128
 129 static struct of_device_id stih407_reset_match[] = {
 130         {
 131                 .compatible = "st,stih407-powerdown",
 132                 .data = &stih407_powerdown_controller,
 133         },
 134         {
 135                 .compatible = "st,stih407-softreset",
 136                 .data = &stih407_softreset_controller,
 137         },
 138         {
 139                 .compatible = "st,stih407-picophyreset",
 140                 .data = &stih407_picophyreset_controller,
 141         },
 142         { /* sentinel */ },
 143 };
 144
 145 static struct platform_driver stih407_reset_driver = {
 146         .probe = syscfg_reset_probe,
 147         .driver = {
 148                 .name = "reset-stih407",
 149                 .of_match_table = stih407_reset_match,
 150         },
 151 };
 152
 153 static int __init stih407_reset_init(void)
 154 {
 155         return platform_driver_register(&stih407_reset_driver);
 156 }
 157
 158 arch_initcall(stih407_reset_init);