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 .owner = THIS_MODULE,
105 .of_match_table = stih415_reset_match,
106 },
107 };
108
stih415_reset_init(void)109 static int __init stih415_reset_init(void)
110 {
111 return platform_driver_register(&stih415_reset_driver);
112 }
113 arch_initcall(stih415_reset_init);
114