1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
// SPDX-License-Identifier: GPL-2.0
/*
* PRU-ICSS platform driver for various TI SoCs
*
* Copyright (C) 2020-2021 Texas Instruments Incorporated - https://www.ti.com/
*/
#include <common.h>
#include <dm.h>
#include <dm/of_access.h>
#include <errno.h>
#include <clk.h>
#include <reset.h>
#include <regmap.h>
#include <syscon.h>
#include <asm/io.h>
#include <power-domain.h>
#include <linux/pruss_driver.h>
#include <dm/device_compat.h>
#define PRUSS_CFG_IEPCLK 0x30
#define ICSSG_CFG_CORE_SYNC 0x3c
#define ICSSG_TASK_MGR_OFFSET 0x2a000
/* PRUSS_IEPCLK register bits */
#define PRUSS_IEPCLK_IEP_OCP_CLK_EN BIT(0)
/* ICSSG CORE_SYNC register bits */
#define ICSSG_CORE_VBUSP_SYNC_EN BIT(0)
/*
* pruss_request_tm_region() - Request pruss for task manager region
* @dev: corresponding k3 device
* @loc: the task manager physical address
*
* Return: 0 if all goes good, else appropriate error message.
*/
int pruss_request_tm_region(struct udevice *dev, phys_addr_t *loc)
{
struct pruss *priv;
priv = dev_get_priv(dev);
if (!priv || !priv->mem_regions[PRUSS_MEM_DRAM0].pa)
return -EINVAL;
*loc = priv->mem_regions[PRUSS_MEM_DRAM0].pa + ICSSG_TASK_MGR_OFFSET;
return 0;
}
/**
* pruss_request_mem_region() - request a memory resource
* @dev: the pruss device
* @mem_id: the memory resource id
* @region: pointer to memory region structure to be filled in
*
* This function allows a client driver to request a memory resource,
* and if successful, will let the client driver own the particular
* memory region until released using the pruss_release_mem_region()
* API.
*
* Returns the memory region if requested resource is available, an
* error otherwise
*/
int pruss_request_mem_region(struct udevice *dev, enum pruss_mem mem_id,
struct pruss_mem_region *region)
{
struct pruss *pruss;
pruss = dev_get_priv(dev);
if (!pruss || !region)
return -EINVAL;
if (mem_id >= PRUSS_MEM_MAX)
return -EINVAL;
if (pruss->mem_in_use[mem_id])
return -EBUSY;
*region = pruss->mem_regions[mem_id];
pruss->mem_in_use[mem_id] = region;
return 0;
}
/**
* pruss_release_mem_region() - release a memory resource
* @dev: the pruss device
* @region: the memory region to release
*
* This function is the complimentary function to
* pruss_request_mem_region(), and allows the client drivers to
* release back a memory resource.
*
* Returns 0 on success, an error code otherwise
*/
int pruss_release_mem_region(struct udevice *dev,
struct pruss_mem_region *region)
{
struct pruss *pruss;
int id;
pruss = dev_get_priv(dev);
if (!pruss || !region)
return -EINVAL;
/* find out the memory region being released */
for (id = 0; id < PRUSS_MEM_MAX; id++) {
if (pruss->mem_in_use[id] == region)
break;
}
if (id == PRUSS_MEM_MAX)
return -EINVAL;
pruss->mem_in_use[id] = NULL;
return 0;
}
/**
* pruss_cfg_update() - configure a PRUSS CFG sub-module register
* @dev: the pruss device
* @reg: register offset within the CFG sub-module
* @mask: bit mask to use for programming the @val
* @val: value to write
*
* Programs a given register within the PRUSS CFG sub-module
*
* Returns 0 on success, or an error code otherwise
*/
int pruss_cfg_update(struct udevice *dev, unsigned int reg,
unsigned int mask, unsigned int val)
{
struct pruss *pruss;
pruss = dev_get_priv(dev);
if (IS_ERR_OR_NULL(pruss))
return -EINVAL;
return regmap_update_bits(pruss->cfg, reg, mask, val);
}
/**
* pruss_probe() - Basic probe
* @dev: corresponding k3 device
*
* Return: 0 if all goes good, else appropriate error message.
*/
static int pruss_probe(struct udevice *dev)
{
const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" };
ofnode sub_node, node, memories;
struct udevice *syscon;
struct pruss *priv;
int ret, idx, i;
priv = dev_get_priv(dev);
node = dev_ofnode(dev);
priv->dev = dev;
memories = ofnode_find_subnode(node, "memories");
for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
idx = ofnode_stringlist_search(memories, "reg-names", mem_names[i]);
priv->mem_regions[i].pa = ofnode_get_addr_size_index(memories, idx,
(u64 *)&priv->mem_regions[i].size);
}
sub_node = ofnode_find_subnode(node, "cfg");
ret = uclass_get_device_by_ofnode(UCLASS_SYSCON, sub_node,
&syscon);
priv->cfg = syscon_get_regmap(syscon);
if (IS_ERR(priv->cfg)) {
dev_err(dev, "unable to get cfg regmap (%ld)\n",
PTR_ERR(priv->cfg));
return -ENODEV;
}
/*
* ToDo: To be modelled as clocks.
* The CORE block uses two multiplexers to allow software to
* select one of three source clocks (ICSSGn_CORE_CLK, ICSSGn_ICLK or
* ICSSGn_IEP_CLK) for the final clock source of the CORE block.
* The user needs to configure ICSSG_CORE_SYNC_REG[0] CORE_VBUSP_SYNC_EN
* bit & ICSSG_IEPCLK_REG[0] IEP_OCP_CLK_EN bit in order to select the
* clock source to the CORE block.
*/
ret = regmap_update_bits(priv->cfg, ICSSG_CFG_CORE_SYNC,
ICSSG_CORE_VBUSP_SYNC_EN,
ICSSG_CORE_VBUSP_SYNC_EN);
if (ret)
return ret;
ret = regmap_update_bits(priv->cfg, PRUSS_CFG_IEPCLK,
PRUSS_IEPCLK_IEP_OCP_CLK_EN,
PRUSS_IEPCLK_IEP_OCP_CLK_EN);
if (ret)
return ret;
dev_dbg(dev, "pruss successfully probed %s\n", dev->name);
return 0;
}
static const struct udevice_id pruss_ids[] = {
{ .compatible = "ti,am654-icssg"},
{}
};
U_BOOT_DRIVER(pruss) = {
.name = "pruss",
.of_match = pruss_ids,
.id = UCLASS_MISC,
.probe = pruss_probe,
.priv_auto = sizeof(struct pruss),
};
|