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
|
/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/occ_gpe0/apss_util.c $ */
/* */
/* OpenPOWER OnChipController Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2015 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
#include "pk.h"
#include "ppe42_scom.h"
#include "pss_constants.h"
#include "apss_util.h"
#define SPIPSS_P2S_ONGOING_MASK 0x8000000000000000
/*
* Function Specification
*
* Name: apss_set_ffdc
*
* Description: Fills up the error struct with the given data.
*
* End Function Specification
*/
void apss_set_ffdc(GpeErrorStruct *o_error, uint32_t i_addr, uint32_t i_rc, uint64_t i_ffdc)
{
o_error->addr = i_addr;
//Return codes defined in apss_struct.h
o_error->rc = i_rc;
o_error->ffdc = i_ffdc;
}
/*
* Function Specification:
*
* Name: wait_spi_completion
*
* Description: Read the specified register (SPIPSS_P2S_STATUS_REG
* or SPIPSS_ADC_STATUS_REG), and check if it's p2s_ongoing
* bit is 0 (operations done). If not, wait
* up to the timeout usec (~1usec per retry).
* If still not clear, continue looping,
* If error/reserved bits are set, a return code will be sent back
*
* Inputs: error: a pointer to a GpeErrorStruct, to populate rc, ffdc,
* and address, in case a scom get error happens
* timeout: # usec to wait for ongoing bit to clear
* Register: SPIPSS_P2S_STATUS_REG or SPIPSS_ADC_STATUS_REG
*
* return: 0 -> Success: spi transaction completed within timeout limit
* not 0 -> timeout: spi transaction did not complete within timeout
* bits 0:31 are masked, and returned back for potential
* analysis of the reason that the transaction timed out
*
* End Function Specification
*/
int wait_spi_completion(GpeErrorStruct *error, uint32_t reg, uint8_t timeout)
{
int i = 0;
int rc;
uint64_t status;
if((reg != SPIPSS_P2S_STATUS_REG) && (reg != SPIPSS_ADC_STATUS_REG))
{
PK_TRACE("gpe0:wait_spi_completion failed: Invalid Register 0x%08x", reg);
rc = GPE_RC_INVALID_REG;
apss_set_ffdc(error, reg, rc, 0x00);
}
else
{
// Keep polling the P2S_ONGOING bits for timeout
for (i = 0; i< timeout; i++)
{
rc = getscom_abs(reg, &status);
if(rc)
{
PK_TRACE("gpe0:wait_spi_completion failed with rc = 0x%08x", rc);
apss_set_ffdc(error, reg, GPE_RC_SCOM_GET_FAILED, rc);
rc = GPE_RC_SCOM_GET_FAILED;
break;
}
// bit zero is the P2s_ONGOING / HWCTRL_ONGOING
// set to 1: means operation is in progress (ONGOING)
// set to 0: means operation is complete, therefore exit for loop.
if((status & SPIPSS_P2S_ONGOING_MASK) == 0)
{
rc = 0;
break;
}
// sleep for 1 microsecond before retry
busy_wait(1);
}
}
//Timed out waiting on P2S_ONGOING / HWCTRL_ONGOING bit.
if (i >= timeout)
{
PK_TRACE("gpe0:wait_spi_completion Timed out waiting for p2s_ongoing to clear.");
apss_set_ffdc(error, reg, GPE_RC_SPI_TIMEOUT, rc);
rc = GPE_RC_SPI_TIMEOUT;
}
return rc;
}
/*
* Function Specification:
*
* Name: busy_wait
*
* Description: a counting loop to simulate sleep calls, and is ISR safe.
*
* Inputs: t_microseconds: time to sleep in microseconds
*
* return: none
*
* End Function Specification
*/
void busy_wait(uint32_t t_microseconds)
{
uint32_t start_decrementer_value; // The decrementer register value at the beginning
uint32_t end_decrementer_value; // The decrementer register value at the end
uint32_t current_decrementer_value; // The current decrementer register value
uint32_t duration;
MFDEC(start_decrementer_value); // get the decrementer register value at the beginning
current_decrementer_value = start_decrementer_value;
// multiply the delay time by the 37.5 MHz external clock frequency.
// I believe that the ppe42_mullw macro works fine, but the
// compiler parameter settings seems broken.
// @todo: This is a temporary fix, use external frequency directive.
duration = (t_microseconds << 5)
+ (t_microseconds << 2)
+ (t_microseconds)
+ (t_microseconds >> 1);
// Calculate the decrementer register value at the end of the busy wait period
end_decrementer_value = start_decrementer_value - duration;
if(start_decrementer_value < end_decrementer_value); // decrementer overflows during the busy wait?
{
MFDEC(current_decrementer_value);
while(current_decrementer_value < end_decrementer_value) // Wait until Decrementer overflows
MFDEC(current_decrementer_value);
}
while (current_decrementer_value > end_decrementer_value) // Wait until end_decrementer_value is reached
MFDEC(current_decrementer_value);
}
void ipc_scom_operation(ipc_msg_t* cmd, void* arg)
{
int l_rc;
ipc_async_cmd_t *async_cmd = (ipc_async_cmd_t*)cmd;
ipc_scom_op_t *scom_op = (ipc_scom_op_t*) async_cmd->cmd_data;
if (scom_op->read)
{
l_rc = getscom_abs(scom_op->addr, &scom_op->data);
}
else
{
l_rc = putscom_abs(scom_op->addr, scom_op->data);
}
if(l_rc)
{
scom_op->rc = l_rc;
PK_TRACE("Error doing generic scom! RC: 0x%08X Addr: 0x%08X Read: %d Data: 0x%08X", l_rc,
scom_op->addr, scom_op->read, scom_op->data);
}
}
|
