1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2018 Xilinx, Inc.
9 #include <linux/platform_device.h>
10 #include <linux/reset-controller.h>
11 #include <linux/firmware/xlnx-zynqmp.h>
12 #include <linux/of_device.h>
14 #define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
15 #define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
16 #define VERSAL_NR_RESETS 95
18 struct zynqmp_reset_soc_data
{
23 struct zynqmp_reset_data
{
24 struct reset_controller_dev rcdev
;
25 const struct zynqmp_reset_soc_data
*data
;
28 static inline struct zynqmp_reset_data
*
29 to_zynqmp_reset_data(struct reset_controller_dev
*rcdev
)
31 return container_of(rcdev
, struct zynqmp_reset_data
, rcdev
);
34 static int zynqmp_reset_assert(struct reset_controller_dev
*rcdev
,
37 struct zynqmp_reset_data
*priv
= to_zynqmp_reset_data(rcdev
);
39 return zynqmp_pm_reset_assert(priv
->data
->reset_id
+ id
,
40 PM_RESET_ACTION_ASSERT
);
43 static int zynqmp_reset_deassert(struct reset_controller_dev
*rcdev
,
46 struct zynqmp_reset_data
*priv
= to_zynqmp_reset_data(rcdev
);
48 return zynqmp_pm_reset_assert(priv
->data
->reset_id
+ id
,
49 PM_RESET_ACTION_RELEASE
);
52 static int zynqmp_reset_status(struct reset_controller_dev
*rcdev
,
55 struct zynqmp_reset_data
*priv
= to_zynqmp_reset_data(rcdev
);
58 err
= zynqmp_pm_reset_get_status(priv
->data
->reset_id
+ id
, &val
);
65 static int zynqmp_reset_reset(struct reset_controller_dev
*rcdev
,
68 struct zynqmp_reset_data
*priv
= to_zynqmp_reset_data(rcdev
);
70 return zynqmp_pm_reset_assert(priv
->data
->reset_id
+ id
,
71 PM_RESET_ACTION_PULSE
);
74 static int zynqmp_reset_of_xlate(struct reset_controller_dev
*rcdev
,
75 const struct of_phandle_args
*reset_spec
)
77 return reset_spec
->args
[0];
80 static const struct zynqmp_reset_soc_data zynqmp_reset_data
= {
81 .reset_id
= ZYNQMP_RESET_ID
,
82 .num_resets
= ZYNQMP_NR_RESETS
,
85 static const struct zynqmp_reset_soc_data versal_reset_data
= {
87 .num_resets
= VERSAL_NR_RESETS
,
90 static const struct reset_control_ops zynqmp_reset_ops
= {
91 .reset
= zynqmp_reset_reset
,
92 .assert = zynqmp_reset_assert
,
93 .deassert
= zynqmp_reset_deassert
,
94 .status
= zynqmp_reset_status
,
97 static int zynqmp_reset_probe(struct platform_device
*pdev
)
99 struct zynqmp_reset_data
*priv
;
101 priv
= devm_kzalloc(&pdev
->dev
, sizeof(*priv
), GFP_KERNEL
);
105 priv
->data
= of_device_get_match_data(&pdev
->dev
);
109 platform_set_drvdata(pdev
, priv
);
111 priv
->rcdev
.ops
= &zynqmp_reset_ops
;
112 priv
->rcdev
.owner
= THIS_MODULE
;
113 priv
->rcdev
.of_node
= pdev
->dev
.of_node
;
114 priv
->rcdev
.nr_resets
= priv
->data
->num_resets
;
115 priv
->rcdev
.of_reset_n_cells
= 1;
116 priv
->rcdev
.of_xlate
= zynqmp_reset_of_xlate
;
118 return devm_reset_controller_register(&pdev
->dev
, &priv
->rcdev
);
121 static const struct of_device_id zynqmp_reset_dt_ids
[] = {
122 { .compatible
= "xlnx,zynqmp-reset", .data
= &zynqmp_reset_data
, },
123 { .compatible
= "xlnx,versal-reset", .data
= &versal_reset_data
, },
127 static struct platform_driver zynqmp_reset_driver
= {
128 .probe
= zynqmp_reset_probe
,
130 .name
= KBUILD_MODNAME
,
131 .of_match_table
= zynqmp_reset_dt_ids
,
135 static int __init
zynqmp_reset_init(void)
137 return platform_driver_register(&zynqmp_reset_driver
);
140 arch_initcall(zynqmp_reset_init
);