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
|
/*-
* Copyright (c) 2013 Ian Lepore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "opt_platform.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <machine/bus.h>
#include <arm/ti/ti_prcm.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_cpu.h>
#include <dev/uart/uart_cpu_fdt.h>
#include <dev/uart/uart_bus.h>
#include <dev/uart/uart_dev_ns8250.h>
#include "uart_if.h"
/*
* High-level UART interface.
*/
struct ti8250_softc {
struct ns8250_softc ns8250_base;
/*uint32_t mystuff;*/
};
#define MDR1_REG 8
#define MDR1_MODE_UART 0
#define MDR1_MODE_DISABLE 7
#define SYSCC_REG 15
#define SYSCC_SOFTRESET (1 << 1)
#define SYSS_REG 16
#define SYSS_STATUS_RESETDONE (1 << 0)
static int
ti8250_bus_probe(struct uart_softc *sc)
{
int status;
int devid;
clk_ident_t clkid;
pcell_t prop;
phandle_t node;
/*
* Get the device id from FDT. If it's not there we can't turn on the
* right clocks, so bail, unless we're doing unit 0. We assume that's
* the serial console, whose clock isn't controllable anyway, and we
* sure don't want to break the console because of a config error.
*/
node = ofw_bus_get_node(sc->sc_dev);
if ((OF_getprop(node, "uart-device-id", &prop, sizeof(prop))) <= 0) {
device_printf(sc->sc_dev,
"missing uart-device-id attribute in FDT\n");
if (device_get_unit(sc->sc_dev) != 0)
return (ENXIO);
devid = 0;
} else
devid = fdt32_to_cpu(prop);
/* Enable clocks for this device. We can't continue if that fails. */
clkid = UART0_CLK + devid;
if ((status = ti_prcm_clk_enable(clkid)) != 0)
return (status);
/*
* Set the hardware to disabled mode, do a full device reset, then set
* it to uart mode. Most devices will be reset-and-disabled already,
* but you never know what a bootloader might have done.
*/
uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE);
uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET);
while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE)
continue;
uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART);
status = ns8250_bus_probe(sc);
if (status == 0)
device_set_desc(sc->sc_dev, "TI UART (16550 compatible)");
return (status);
}
static kobj_method_t ti8250_methods[] = {
KOBJMETHOD(uart_probe, ti8250_bus_probe),
KOBJMETHOD(uart_attach, ns8250_bus_attach),
KOBJMETHOD(uart_detach, ns8250_bus_detach),
KOBJMETHOD(uart_flush, ns8250_bus_flush),
KOBJMETHOD(uart_getsig, ns8250_bus_getsig),
KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl),
KOBJMETHOD(uart_ipend, ns8250_bus_ipend),
KOBJMETHOD(uart_param, ns8250_bus_param),
KOBJMETHOD(uart_receive, ns8250_bus_receive),
KOBJMETHOD(uart_setsig, ns8250_bus_setsig),
KOBJMETHOD(uart_transmit, ns8250_bus_transmit),
KOBJMETHOD_END
};
static struct uart_class uart_ti8250_class = {
"ti8250",
ti8250_methods,
sizeof(struct ti8250_softc),
.uc_ops = &uart_ns8250_ops,
.uc_range = 0x88,
.uc_rclk = 48000000
};
static struct ofw_compat_data compat_data[] = {
{"ti,ns16550", (uintptr_t)&uart_ti8250_class},
{NULL, (uintptr_t)NULL},
};
UART_FDT_CLASS_AND_DEVICE(compat_data);
|
