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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/serial/cpm_uart.c | |
3 | * | |
4 | * Driver for CPM (SCC/SMC) serial ports; CPM1 definitions | |
5 | * | |
4c8d3d99 | 6 | * Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2) |
1da177e4 | 7 | * Pantelis Antoniou (panto@intracom.gr) (CPM1) |
311c4627 | 8 | * |
1da177e4 LT |
9 | * Copyright (C) 2004 Freescale Semiconductor, Inc. |
10 | * (C) 2004 Intracom, S.A. | |
6e197696 | 11 | * (C) 2006 MontaVista Software, Inc. |
0d844065 | 12 | * Vitaly Bordug <vbordug@ru.mvista.com> |
1da177e4 LT |
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 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/tty.h> | |
5a0e3ad6 | 32 | #include <linux/gfp.h> |
1da177e4 LT |
33 | #include <linux/ioport.h> |
34 | #include <linux/init.h> | |
35 | #include <linux/serial.h> | |
36 | #include <linux/console.h> | |
37 | #include <linux/sysrq.h> | |
38 | #include <linux/device.h> | |
39 | #include <linux/bootmem.h> | |
40 | #include <linux/dma-mapping.h> | |
41 | ||
42 | #include <asm/io.h> | |
43 | #include <asm/irq.h> | |
f25222b9 | 44 | #include <asm/fs_pd.h> |
1da177e4 LT |
45 | |
46 | #include <linux/serial_core.h> | |
47 | #include <linux/kernel.h> | |
48 | ||
d464df26 LP |
49 | #include <linux/of.h> |
50 | ||
1da177e4 LT |
51 | #include "cpm_uart.h" |
52 | ||
53 | /**************************************************************/ | |
54 | ||
7ae87036 SW |
55 | void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd) |
56 | { | |
362f9b6f | 57 | cpm_command(port->command, cmd); |
7ae87036 | 58 | } |
d464df26 LP |
59 | |
60 | void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port, | |
61 | struct device_node *np) | |
62 | { | |
63 | return of_iomap(np, 1); | |
64 | } | |
65 | ||
66 | void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram) | |
67 | { | |
68 | iounmap(pram); | |
69 | } | |
70 | ||
1da177e4 | 71 | /* |
311c4627 | 72 | * Allocate DP-Ram and memory buffers. We need to allocate a transmit and |
1da177e4 LT |
73 | * receive buffer descriptors from dual port ram, and a character |
74 | * buffer area from host mem. If we are allocating for the console we need | |
75 | * to do it from bootmem | |
76 | */ | |
77 | int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con) | |
78 | { | |
79 | int dpmemsz, memsz; | |
80 | u8 *dp_mem; | |
4c35630c | 81 | unsigned long dp_offset; |
1da177e4 LT |
82 | u8 *mem_addr; |
83 | dma_addr_t dma_addr = 0; | |
84 | ||
85 | pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line); | |
86 | ||
87 | dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos); | |
88 | dp_offset = cpm_dpalloc(dpmemsz, 8); | |
4c35630c | 89 | if (IS_ERR_VALUE(dp_offset)) { |
1da177e4 LT |
90 | printk(KERN_ERR |
91 | "cpm_uart_cpm1.c: could not allocate buffer descriptors\n"); | |
92 | return -ENOMEM; | |
93 | } | |
94 | dp_mem = cpm_dpram_addr(dp_offset); | |
95 | ||
96 | memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) + | |
97 | L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize); | |
98 | if (is_con) { | |
311c4627 KG |
99 | /* was hostalloc but changed cause it blows away the */ |
100 | /* large tlb mapping when pinning the kernel area */ | |
4e4b7952 | 101 | mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8)); |
f25222b9 | 102 | dma_addr = (u32)cpm_dpram_phys(mem_addr); |
1da177e4 | 103 | } else |
8b05cefc | 104 | mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr, |
1da177e4 LT |
105 | GFP_KERNEL); |
106 | ||
107 | if (mem_addr == NULL) { | |
108 | cpm_dpfree(dp_offset); | |
109 | printk(KERN_ERR | |
110 | "cpm_uart_cpm1.c: could not allocate coherent memory\n"); | |
111 | return -ENOMEM; | |
112 | } | |
113 | ||
114 | pinfo->dp_addr = dp_offset; | |
09b03b6c VB |
115 | pinfo->mem_addr = mem_addr; /* virtual address*/ |
116 | pinfo->dma_addr = dma_addr; /* physical address*/ | |
117 | pinfo->mem_size = memsz; | |
1da177e4 LT |
118 | |
119 | pinfo->rx_buf = mem_addr; | |
120 | pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos | |
121 | * pinfo->rx_fifosize); | |
122 | ||
c1dcfd9d | 123 | pinfo->rx_bd_base = (cbd_t __iomem __force *)dp_mem; |
1da177e4 LT |
124 | pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos; |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | void cpm_uart_freebuf(struct uart_cpm_port *pinfo) | |
130 | { | |
8b05cefc BB |
131 | dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos * |
132 | pinfo->rx_fifosize) + | |
1da177e4 LT |
133 | L1_CACHE_ALIGN(pinfo->tx_nrfifos * |
134 | pinfo->tx_fifosize), pinfo->mem_addr, | |
135 | pinfo->dma_addr); | |
136 | ||
137 | cpm_dpfree(pinfo->dp_addr); | |
138 | } |