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
218
219
220
221
222
|
/*
* ARC FPGA Platform support code
*
* Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/types.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/console.h>
#include <linux/of_platform.h>
#include <asm/setup.h>
#include <asm/clk.h>
#include <asm/mach_desc.h>
#include <plat/memmap.h>
#include <plat/smp.h>
#include <plat/irq.h>
/*-----------------------BVCI Latency Unit -----------------------------*/
#ifdef CONFIG_ARC_HAS_BVCI_LAT_UNIT
int lat_cycles = CONFIG_BVCI_LAT_CYCLES;
/* BVCI Bus Profiler: Latency Unit */
static void __init setup_bvci_lat_unit(void)
{
#define MAX_BVCI_UNITS 12
unsigned int i;
unsigned int *base = (unsigned int *)BVCI_LAT_UNIT_BASE;
const unsigned long units_req = CONFIG_BVCI_LAT_UNITS;
const unsigned int REG_UNIT = 21;
const unsigned int REG_VAL = 22;
/*
* There are multiple Latency Units corresponding to the many
* interfaces of the system bus arbiter (both CPU side as well as
* the peripheral side).
*
* Unit 0 - System Arb and Mem Controller - adds latency to all
* memory trasactions
* Unit 1 - I$ and System Bus
* Unit 2 - D$ and System Bus
* ..
* Unit 12 - IDE Disk controller and System Bus
*
* The programmers model requires writing to lat_unit reg first
* and then the latency value (cycles) to lat_value reg
*/
if (CONFIG_BVCI_LAT_UNITS == 0) {
writel(0, base + REG_UNIT);
writel(lat_cycles, base + REG_VAL);
pr_info("BVCI Latency for all Memory Transactions %d cycles\n",
lat_cycles);
} else {
for_each_set_bit(i, &units_req, MAX_BVCI_UNITS) {
writel(i + 1, base + REG_UNIT); /* loop is 0 based */
writel(lat_cycles, base + REG_VAL);
pr_info("BVCI Latency for Unit[%d] = %d cycles\n",
(i + 1), lat_cycles);
}
}
}
#else
static void __init setup_bvci_lat_unit(void)
{
}
#endif
/*----------------------- Platform Devices -----------------------------*/
static unsigned long arc_uart_info[] = {
0, /* uart->is_emulated (runtime @running_on_hw) */
0, /* uart->port.uartclk */
0, /* uart->baud */
0
};
#if defined(CONFIG_SERIAL_ARC_CONSOLE)
/*
* static platform data - but only for early serial
* TBD: derive this from a special DT node
*/
static struct resource arc_uart0_res[] = {
{
.start = UART0_BASE,
.end = UART0_BASE + 0xFF,
.flags = IORESOURCE_MEM,
},
{
.start = UART0_IRQ,
.end = UART0_IRQ,
.flags = IORESOURCE_IRQ,
},
};
static struct platform_device arc_uart0_dev = {
.name = "arc-uart",
.id = 0,
.num_resources = ARRAY_SIZE(arc_uart0_res),
.resource = arc_uart0_res,
.dev = {
.platform_data = &arc_uart_info,
},
};
static struct platform_device *fpga_early_devs[] __initdata = {
&arc_uart0_dev,
};
#endif
static void arc_fpga_serial_init(void)
{
/* To let driver workaround ISS bug: baudh Reg can't be set to 0 */
arc_uart_info[0] = !running_on_hw;
arc_uart_info[1] = arc_get_core_freq();
arc_uart_info[2] = CONFIG_ARC_SERIAL_BAUD;
#if defined(CONFIG_SERIAL_ARC_CONSOLE)
early_platform_add_devices(fpga_early_devs,
ARRAY_SIZE(fpga_early_devs));
/*
* ARC console driver registers itself as an early platform driver
* of class "earlyprintk".
* Install it here, followed by probe of devices.
* The installation here doesn't require earlyprintk in command line
* To do so however, replace the lines below with
* parse_early_param();
* early_platform_driver_probe("earlyprintk", 1, 1);
* ^^
*/
early_platform_driver_register_all("earlyprintk");
early_platform_driver_probe("earlyprintk", 1, 0);
/*
* This is to make sure that arc uart would be preferred console
* despite one/more of following:
* -command line lacked "console=ttyARC0" or
* -CONFIG_VT_CONSOLE was enabled (for no reason whatsoever)
* Note that this needs to be done after above early console is reg,
* otherwise the early console never gets a chance to run.
*/
add_preferred_console("ttyARC", 0, "115200");
#endif
}
static void __init plat_fpga_early_init(void)
{
pr_info("[plat-arcfpga]: registering early dev resources\n");
setup_bvci_lat_unit();
arc_fpga_serial_init();
}
static struct of_dev_auxdata plat_auxdata_lookup[] __initdata = {
#if defined(CONFIG_SERIAL_ARC) || defined(CONFIG_SERIAL_ARC_MODULE)
OF_DEV_AUXDATA("snps,arc-uart", UART0_BASE, "arc-uart", arc_uart_info),
#endif
{}
};
static void __init plat_fpga_populate_dev(void)
{
pr_info("[plat-arcfpga]: registering device resources\n");
/*
* Traverses flattened DeviceTree - registering platform devices
* complete with their resources
*/
of_platform_populate(NULL, of_default_bus_match_table,
plat_auxdata_lookup, NULL);
}
/*----------------------- Machine Descriptions ------------------------------
*
* Machine description is simply a set of platform/board specific callbacks
* This is not directly related to DeviceTree based dynamic device creation,
* however as part of early device tree scan, we also select the right
* callback set, by matching the DT compatible name.
*/
static const char *aa4_compat[] __initdata = {
"snps,arc-angel4",
NULL,
};
MACHINE_START(ANGEL4, "angel4")
.dt_compat = aa4_compat,
.init_early = plat_fpga_early_init,
.init_machine = plat_fpga_populate_dev,
.init_irq = plat_fpga_init_IRQ,
#ifdef CONFIG_SMP
.init_smp = iss_model_init_smp,
#endif
MACHINE_END
static const char *ml509_compat[] __initdata = {
"snps,arc-ml509",
NULL,
};
MACHINE_START(ML509, "ml509")
.dt_compat = ml509_compat,
.init_early = plat_fpga_early_init,
.init_machine = plat_fpga_populate_dev,
.init_irq = plat_fpga_init_IRQ,
#ifdef CONFIG_SMP
.init_smp = iss_model_init_smp,
#endif
MACHINE_END
|
