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
|
/*
* linux/drivers/serial/cpm_uart_cpm2.c
*
* Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
*
* Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
* Pantelis Antoniou (panto@intracom.gr) (CPM1)
*
* Copyright (C) 2004 Freescale Semiconductor, Inc.
* (C) 2004 Intracom, S.A.
* (C) 2006 MontaVista Software, Inc.
* Vitaly Bordug <vbordug@ru.mvista.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/device.h>
#include <linux/bootmem.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/fs_pd.h>
#include <asm/prom.h>
#include <linux/serial_core.h>
#include <linux/kernel.h>
#include "cpm_uart.h"
/**************************************************************/
void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
{
cpm_command(port->command, cmd);
}
void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
struct device_node *np)
{
void __iomem *pram;
unsigned long offset;
struct resource res;
resource_size_t len;
/* Don't remap parameter RAM if it has already been initialized
* during console setup.
*/
if (IS_SMC(port) && port->smcup)
return port->smcup;
else if (!IS_SMC(port) && port->sccup)
return port->sccup;
if (of_address_to_resource(np, 1, &res))
return NULL;
len = resource_size(&res);
pram = ioremap(res.start, len);
if (!pram)
return NULL;
if (!IS_SMC(port))
return pram;
if (len != 2) {
printk(KERN_WARNING "cpm_uart[%d]: device tree references "
"SMC pram, using boot loader/wrapper pram mapping. "
"Please fix your device tree to reference the pram "
"base register instead.\n",
port->port.line);
return pram;
}
offset = cpm_dpalloc(PROFF_SMC_SIZE, 64);
out_be16(pram, offset);
iounmap(pram);
return cpm_muram_addr(offset);
}
void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
{
if (!IS_SMC(port))
iounmap(pram);
}
/*
* Allocate DP-Ram and memory buffers. We need to allocate a transmit and
* receive buffer descriptors from dual port ram, and a character
* buffer area from host mem. If we are allocating for the console we need
* to do it from bootmem
*/
int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
{
int dpmemsz, memsz;
u8 __iomem *dp_mem;
unsigned long dp_offset;
u8 *mem_addr;
dma_addr_t dma_addr = 0;
pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
dp_offset = cpm_dpalloc(dpmemsz, 8);
if (IS_ERR_VALUE(dp_offset)) {
printk(KERN_ERR
"cpm_uart_cpm.c: could not allocate buffer descriptors\n");
return -ENOMEM;
}
dp_mem = cpm_dpram_addr(dp_offset);
memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
if (is_con) {
mem_addr = kzalloc(memsz, GFP_NOWAIT);
dma_addr = virt_to_bus(mem_addr);
}
else
mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
GFP_KERNEL);
if (mem_addr == NULL) {
cpm_dpfree(dp_offset);
printk(KERN_ERR
"cpm_uart_cpm.c: could not allocate coherent memory\n");
return -ENOMEM;
}
pinfo->dp_addr = dp_offset;
pinfo->mem_addr = mem_addr;
pinfo->dma_addr = dma_addr;
pinfo->mem_size = memsz;
pinfo->rx_buf = mem_addr;
pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
* pinfo->rx_fifosize);
pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
return 0;
}
void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
{
dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
pinfo->rx_fifosize) +
L1_CACHE_ALIGN(pinfo->tx_nrfifos *
pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
pinfo->dma_addr);
cpm_dpfree(pinfo->dp_addr);
}
|
