1 /*
2 * linux/drivers/serial/cpm_uart_cpm2.c
3 *
4 * Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
5 *
6 * Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
7 * Pantelis Antoniou (panto@intracom.gr) (CPM1)
8 *
9 * Copyright (C) 2004 Freescale Semiconductor, Inc.
10 * (C) 2004 Intracom, S.A.
11 * (C) 2006 MontaVista Software, Inc.
12 * Vitaly Bordug <vbordug@ru.mvista.com>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 *
28 */
29
30 #include <linux/module.h>
31 #include <linux/tty.h>
32 #include <linux/ioport.h>
33 #include <linux/init.h>
34 #include <linux/serial.h>
35 #include <linux/console.h>
36 #include <linux/sysrq.h>
37 #include <linux/device.h>
38 #include <linux/bootmem.h>
39 #include <linux/dma-mapping.h>
40
41 #include <asm/io.h>
42 #include <asm/irq.h>
43 #include <asm/fs_pd.h>
44 #include <asm/prom.h>
45
46 #include <linux/serial_core.h>
47 #include <linux/kernel.h>
48
49 #include "cpm_uart.h"
50
51 /**************************************************************/
52
53 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
54 {
55 cpm_command(port->command, cmd);
56 }
57
58 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
59 struct device_node *np)
60 {
61 void __iomem *pram;
62 unsigned long offset;
63 struct resource res;
64 unsigned long len;
65
66 /* Don't remap parameter RAM if it has already been initialized
67 * during console setup.
68 */
69 if (IS_SMC(port) && port->smcup)
70 return port->smcup;
71 else if (!IS_SMC(port) && port->sccup)
72 return port->sccup;
73
74 if (of_address_to_resource(np, 1, &res))
75 return NULL;
76
77 len = 1 + res.end - res.start;
78 pram = ioremap(res.start, len);
79 if (!pram)
80 return NULL;
81
82 if (!IS_SMC(port))
83 return pram;
84
85 if (len != 2) {
86 printk(KERN_WARNING "cpm_uart[%d]: device tree references "
87 "SMC pram, using boot loader/wrapper pram mapping. "
88 "Please fix your device tree to reference the pram "
89 "base register instead.\n",
90 port->port.line);
91 return pram;
92 }
93
94 offset = cpm_dpalloc(PROFF_SMC_SIZE, 64);
95 out_be16(pram, offset);
96 iounmap(pram);
97 return cpm_muram_addr(offset);
98 }
99
100 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
101 {
102 if (!IS_SMC(port))
103 iounmap(pram);
104 }
105
106 /*
107 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
108 * receive buffer descriptors from dual port ram, and a character
109 * buffer area from host mem. If we are allocating for the console we need
110 * to do it from bootmem
111 */
112 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
113 {
114 int dpmemsz, memsz;
115 u8 __iomem *dp_mem;
116 unsigned long dp_offset;
117 u8 *mem_addr;
118 dma_addr_t dma_addr = 0;
119
120 pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
121
122 dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
123 dp_offset = cpm_dpalloc(dpmemsz, 8);
124 if (IS_ERR_VALUE(dp_offset)) {
125 printk(KERN_ERR
126 "cpm_uart_cpm.c: could not allocate buffer descriptors\n");
127 return -ENOMEM;
128 }
129
130 dp_mem = cpm_dpram_addr(dp_offset);
131
132 memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
133 L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
134 if (is_con) {
135 mem_addr = kzalloc(memsz, GFP_NOWAIT);
136 dma_addr = virt_to_bus(mem_addr);
137 }
138 else
139 mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
140 GFP_KERNEL);
141
142 if (mem_addr == NULL) {
143 cpm_dpfree(dp_offset);
144 printk(KERN_ERR
145 "cpm_uart_cpm.c: could not allocate coherent memory\n");
146 return -ENOMEM;
147 }
148
149 pinfo->dp_addr = dp_offset;
150 pinfo->mem_addr = mem_addr;
151 pinfo->dma_addr = dma_addr;
152 pinfo->mem_size = memsz;
153
154 pinfo->rx_buf = mem_addr;
155 pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
156 * pinfo->rx_fifosize);
157
158 pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
159 pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
160
161 return 0;
162 }
163
164 void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
165 {
166 dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
167 pinfo->rx_fifosize) +
168 L1_CACHE_ALIGN(pinfo->tx_nrfifos *
169 pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
170 pinfo->dma_addr);
171
172 cpm_dpfree(pinfo->dp_addr);
173 }
174
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