kernel/drivers/reset/sti/reset-stih415.c

   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  */
  23 static const char stih415_front[] = "st,stih415-front-syscfg";
  24 static const char stih415_rear[] = "st,stih415-rear-syscfg";
  25 static const char stih415_sbc[] = "st,stih415-sbc-syscfg";
  26 static 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
  57 static 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
  69 static 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
  79 static 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
  85 static 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
  92 static 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
 100 static 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
 108 static int __init stih415_reset_init(void)
 109 {
 110         return platform_driver_register(&stih415_reset_driver);
 111 }
 112 arch_initcall(stih415_reset_init);