1 /*
2 * linux/drivers/serial/cpm_uart.c
3 *
4 * Driver for CPM (SCC/SMC) serial ports; CPM1 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
45 #include <linux/serial_core.h>
46 #include <linux/kernel.h>
47
48 #include <linux/of.h>
49
50 #include "cpm_uart.h"
51
52 /**************************************************************/
53
cpm_line_cr_cmd(struct uart_cpm_port * port,int cmd)54 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
55 {
56 cpm_command(port->command, cmd);
57 }
58
cpm_uart_map_pram(struct uart_cpm_port * port,struct device_node * np)59 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
60 struct device_node *np)
61 {
62 return of_iomap(np, 1);
63 }
64
cpm_uart_unmap_pram(struct uart_cpm_port * port,void __iomem * pram)65 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
66 {
67 iounmap(pram);
68 }
69
70 /*
71 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
72 * receive buffer descriptors from dual port ram, and a character
73 * buffer area from host mem. If we are allocating for the console we need
74 * to do it from bootmem
75 */
cpm_uart_allocbuf(struct uart_cpm_port * pinfo,unsigned int is_con)76 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
77 {
78 int dpmemsz, memsz;
79 u8 *dp_mem;
80 unsigned long dp_offset;
81 u8 *mem_addr;
82 dma_addr_t dma_addr = 0;
83
84 pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
85
86 dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
87 dp_offset = cpm_dpalloc(dpmemsz, 8);
88 if (IS_ERR_VALUE(dp_offset)) {
89 printk(KERN_ERR
90 "cpm_uart_cpm1.c: could not allocate buffer descriptors\n");
91 return -ENOMEM;
92 }
93 dp_mem = cpm_dpram_addr(dp_offset);
94
95 memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
96 L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
97 if (is_con) {
98 /* was hostalloc but changed cause it blows away the */
99 /* large tlb mapping when pinning the kernel area */
100 mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8));
101 dma_addr = (u32)cpm_dpram_phys(mem_addr);
102 } else
103 mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
104 GFP_KERNEL);
105
106 if (mem_addr == NULL) {
107 cpm_dpfree(dp_offset);
108 printk(KERN_ERR
109 "cpm_uart_cpm1.c: could not allocate coherent memory\n");
110 return -ENOMEM;
111 }
112
113 pinfo->dp_addr = dp_offset;
114 pinfo->mem_addr = mem_addr; /* virtual address*/
115 pinfo->dma_addr = dma_addr; /* physical address*/
116 pinfo->mem_size = memsz;
117
118 pinfo->rx_buf = mem_addr;
119 pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
120 * pinfo->rx_fifosize);
121
122 pinfo->rx_bd_base = (cbd_t __iomem __force *)dp_mem;
123 pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
124
125 return 0;
126 }
127
cpm_uart_freebuf(struct uart_cpm_port * pinfo)128 void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
129 {
130 dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
131 pinfo->rx_fifosize) +
132 L1_CACHE_ALIGN(pinfo->tx_nrfifos *
133 pinfo->tx_fifosize), pinfo->mem_addr,
134 pinfo->dma_addr);
135
136 cpm_dpfree(pinfo->dp_addr);
137 }
138