1 /*
2  * (C) Copyright 2015-2016
3  * Texas Instruments Incorporated - http://www.ti.com/
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 #define pr_fmt(fmt) "%s: " fmt, __func__
7 #include <common.h>
8 #include <dm.h>
9 #include <errno.h>
10 #include <fdtdec.h>
11 #include <remoteproc.h>
12 #include <mach/psc_defs.h>
13 
14 DECLARE_GLOBAL_DATA_PTR;
15 
16 /**
17  * struct ti_powerproc_privdata - power processor private data
18  * @loadaddr:	base address for loading the power processor
19  * @psc_module:	psc module address.
20  */
21 struct ti_powerproc_privdata {
22 	phys_addr_t loadaddr;
23 	u32 psc_module;
24 };
25 
26 /**
27  * ti_of_to_priv() - generate private data from device tree
28  * @dev:	corresponding ti remote processor device
29  * @priv:	pointer to driver specific private data
30  *
31  * Return: 0 if all went ok, else corresponding -ve error
32  */
33 static int ti_of_to_priv(struct udevice *dev,
34 			 struct ti_powerproc_privdata *priv)
35 {
36 	int node = dev->of_offset;
37 	const void *blob = gd->fdt_blob;
38 	int tmp;
39 
40 	if (!blob) {
41 		debug("'%s' no dt?\n", dev->name);
42 		return -EINVAL;
43 	}
44 
45 	priv->loadaddr = fdtdec_get_addr(blob, node, "reg");
46 	if (priv->loadaddr == FDT_ADDR_T_NONE) {
47 		debug("'%s': no 'reg' property\n", dev->name);
48 		return -EINVAL;
49 	}
50 
51 	tmp = fdtdec_get_int(blob, node, "ti,lpsc_module", -EINVAL);
52 	if (tmp < 0) {
53 		debug("'%s': no 'ti,lpsc_module' property\n", dev->name);
54 		return tmp;
55 	}
56 	priv->psc_module = tmp;
57 
58 	return 0;
59 }
60 
61 /**
62  * ti_powerproc_probe() - Basic probe
63  * @dev:	corresponding ti remote processor device
64  *
65  * Return: 0 if all went ok, else corresponding -ve error
66  */
67 static int ti_powerproc_probe(struct udevice *dev)
68 {
69 	struct dm_rproc_uclass_pdata *uc_pdata;
70 	struct ti_powerproc_privdata *priv;
71 	int ret;
72 
73 	uc_pdata = dev_get_uclass_platdata(dev);
74 	priv = dev_get_priv(dev);
75 
76 	ret = ti_of_to_priv(dev, priv);
77 
78 	debug("%s probed with slave_addr=0x%08lX module=%d(%d)\n",
79 	      uc_pdata->name, priv->loadaddr, priv->psc_module, ret);
80 
81 	return ret;
82 }
83 
84 /**
85  * ti_powerproc_load() - Loadup the TI remote processor
86  * @dev:	corresponding ti remote processor device
87  * @addr:	Address in memory where image binary is stored
88  * @size:	Size in bytes of the image binary
89  *
90  * Return: 0 if all went ok, else corresponding -ve error
91  */
92 static int ti_powerproc_load(struct udevice *dev, ulong addr, ulong size)
93 {
94 	struct dm_rproc_uclass_pdata *uc_pdata;
95 	struct ti_powerproc_privdata *priv;
96 	int ret;
97 
98 	uc_pdata = dev_get_uclass_platdata(dev);
99 	if (!uc_pdata) {
100 		debug("%s: no uc pdata!\n", dev->name);
101 		return -EINVAL;
102 	}
103 
104 	priv = dev_get_priv(dev);
105 	ret = psc_module_keep_in_reset_enabled(priv->psc_module, false);
106 	if (ret) {
107 		debug("%s Unable to disable module '%d'(ret=%d)\n",
108 		      uc_pdata->name, priv->psc_module, ret);
109 		return ret;
110 	}
111 
112 	debug("%s: Loading binary from 0x%08lX, size 0x%08lX to 0x%08lX\n",
113 	      uc_pdata->name, addr, size, priv->loadaddr);
114 
115 	memcpy((void *)priv->loadaddr, (void *)addr, size);
116 
117 	debug("%s: Complete!\n", uc_pdata->name);
118 	return 0;
119 }
120 
121 /**
122  * ti_powerproc_start() - (replace: short desc)
123  * @dev:	corresponding ti remote processor device
124  *
125  * Return: 0 if all went ok, else corresponding -ve error
126  */
127 static int ti_powerproc_start(struct udevice *dev)
128 {
129 	struct dm_rproc_uclass_pdata *uc_pdata;
130 	struct ti_powerproc_privdata *priv;
131 	int ret;
132 
133 	uc_pdata = dev_get_uclass_platdata(dev);
134 	if (!uc_pdata) {
135 		debug("%s: no uc pdata!\n", dev->name);
136 		return -EINVAL;
137 	}
138 
139 	priv = dev_get_priv(dev);
140 	ret = psc_disable_module(priv->psc_module);
141 	if (ret) {
142 		debug("%s Unable to disable module '%d'(ret=%d)\n",
143 		      uc_pdata->name, priv->psc_module, ret);
144 		return ret;
145 	}
146 
147 	ret = psc_module_release_from_reset(priv->psc_module);
148 	if (ret) {
149 		debug("%s Failed to wait for module '%d'(ret=%d)\n",
150 		      uc_pdata->name, priv->psc_module, ret);
151 		return ret;
152 	}
153 	ret = psc_enable_module(priv->psc_module);
154 	if (ret) {
155 		debug("%s Unable to disable module '%d'(ret=%d)\n",
156 		      uc_pdata->name, priv->psc_module, ret);
157 		return ret;
158 	}
159 
160 	return 0;
161 }
162 
163 static const struct dm_rproc_ops ti_powerproc_ops = {
164 	.load = ti_powerproc_load,
165 	.start = ti_powerproc_start,
166 };
167 
168 static const struct udevice_id ti_powerproc_ids[] = {
169 	{.compatible = "ti,power-processor"},
170 	{}
171 };
172 
173 U_BOOT_DRIVER(ti_powerproc) = {
174 	.name = "ti_power_proc",
175 	.of_match = ti_powerproc_ids,
176 	.id = UCLASS_REMOTEPROC,
177 	.ops = &ti_powerproc_ops,
178 	.probe = ti_powerproc_probe,
179 	.priv_auto_alloc_size = sizeof(struct ti_powerproc_privdata),
180 };
181