Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/serial/cpm_uart_cpm2.c | |
3 | * | |
4 | * Driver for CPM (SCC/SMC) serial ports; CPM2 definitions | |
5 | * | |
4c8d3d99 | 6 | * Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2) |
1da177e4 | 7 | * Pantelis Antoniou (panto@intracom.gr) (CPM1) |
0d844065 | 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> | |
32 | #include <linux/ioport.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
3dd0dcbe | 44 | #include <asm/fs_pd.h> |
d464df26 | 45 | #include <asm/prom.h> |
1da177e4 LT |
46 | |
47 | #include <linux/serial_core.h> | |
48 | #include <linux/kernel.h> | |
49 | ||
50 | #include "cpm_uart.h" | |
51 | ||
52 | /**************************************************************/ | |
53 | ||
7ae87036 SW |
54 | void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd) |
55 | { | |
362f9b6f | 56 | cpm_command(port->command, cmd); |
7ae87036 | 57 | } |
d464df26 LP |
58 | |
59 | void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port, | |
60 | struct device_node *np) | |
61 | { | |
62 | void __iomem *pram; | |
63 | unsigned long offset; | |
64 | struct resource res; | |
23144366 | 65 | resource_size_t len; |
d464df26 LP |
66 | |
67 | /* Don't remap parameter RAM if it has already been initialized | |
68 | * during console setup. | |
69 | */ | |
70 | if (IS_SMC(port) && port->smcup) | |
71 | return port->smcup; | |
72 | else if (!IS_SMC(port) && port->sccup) | |
73 | return port->sccup; | |
74 | ||
75 | if (of_address_to_resource(np, 1, &res)) | |
76 | return NULL; | |
77 | ||
23144366 | 78 | len = resource_size(&res); |
d464df26 LP |
79 | pram = ioremap(res.start, len); |
80 | if (!pram) | |
81 | return NULL; | |
82 | ||
83 | if (!IS_SMC(port)) | |
84 | return pram; | |
85 | ||
86 | if (len != 2) { | |
87 | printk(KERN_WARNING "cpm_uart[%d]: device tree references " | |
88 | "SMC pram, using boot loader/wrapper pram mapping. " | |
89 | "Please fix your device tree to reference the pram " | |
90 | "base register instead.\n", | |
91 | port->port.line); | |
92 | return pram; | |
93 | } | |
94 | ||
95 | offset = cpm_dpalloc(PROFF_SMC_SIZE, 64); | |
96 | out_be16(pram, offset); | |
97 | iounmap(pram); | |
98 | return cpm_muram_addr(offset); | |
99 | } | |
100 | ||
101 | void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram) | |
102 | { | |
103 | if (!IS_SMC(port)) | |
104 | iounmap(pram); | |
105 | } | |
106 | ||
1da177e4 | 107 | /* |
0d844065 | 108 | * Allocate DP-Ram and memory buffers. We need to allocate a transmit and |
1da177e4 LT |
109 | * receive buffer descriptors from dual port ram, and a character |
110 | * buffer area from host mem. If we are allocating for the console we need | |
111 | * to do it from bootmem | |
112 | */ | |
113 | int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con) | |
114 | { | |
115 | int dpmemsz, memsz; | |
15f8c604 | 116 | u8 __iomem *dp_mem; |
4c35630c | 117 | unsigned long dp_offset; |
1da177e4 LT |
118 | u8 *mem_addr; |
119 | dma_addr_t dma_addr = 0; | |
120 | ||
121 | pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line); | |
122 | ||
123 | dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos); | |
124 | dp_offset = cpm_dpalloc(dpmemsz, 8); | |
4c35630c | 125 | if (IS_ERR_VALUE(dp_offset)) { |
1da177e4 LT |
126 | printk(KERN_ERR |
127 | "cpm_uart_cpm.c: could not allocate buffer descriptors\n"); | |
128 | return -ENOMEM; | |
129 | } | |
130 | ||
131 | dp_mem = cpm_dpram_addr(dp_offset); | |
132 | ||
133 | memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) + | |
134 | L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize); | |
09b03b6c | 135 | if (is_con) { |
6e900de3 | 136 | mem_addr = kzalloc(memsz, GFP_NOWAIT); |
8e30a9a2 | 137 | dma_addr = virt_to_bus(mem_addr); |
09b03b6c | 138 | } |
1da177e4 | 139 | else |
8b05cefc | 140 | mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr, |
1da177e4 LT |
141 | GFP_KERNEL); |
142 | ||
143 | if (mem_addr == NULL) { | |
144 | cpm_dpfree(dp_offset); | |
145 | printk(KERN_ERR | |
146 | "cpm_uart_cpm.c: could not allocate coherent memory\n"); | |
147 | return -ENOMEM; | |
148 | } | |
149 | ||
150 | pinfo->dp_addr = dp_offset; | |
151 | pinfo->mem_addr = mem_addr; | |
152 | pinfo->dma_addr = dma_addr; | |
09b03b6c | 153 | pinfo->mem_size = memsz; |
1da177e4 LT |
154 | |
155 | pinfo->rx_buf = mem_addr; | |
156 | pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos | |
157 | * pinfo->rx_fifosize); | |
158 | ||
15f8c604 | 159 | pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem; |
1da177e4 LT |
160 | pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos; |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | void cpm_uart_freebuf(struct uart_cpm_port *pinfo) | |
166 | { | |
8b05cefc BB |
167 | dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos * |
168 | pinfo->rx_fifosize) + | |
1da177e4 | 169 | L1_CACHE_ALIGN(pinfo->tx_nrfifos * |
c1dcfd9d | 170 | pinfo->tx_fifosize), (void __force *)pinfo->mem_addr, |
1da177e4 LT |
171 | pinfo->dma_addr); |
172 | ||
173 | cpm_dpfree(pinfo->dp_addr); | |
174 | } |