2 * linux/drivers/serial/cpm_uart_cpm2.c
4 * Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
6 * Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
7 * Pantelis Antoniou (panto@intracom.gr) (CPM1)
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>
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.
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.
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
30 #include <linux/module.h>
31 #include <linux/tty.h>
32 #include <linux/ioport.h>
33 #include <linux/slab.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>
44 #include <asm/fs_pd.h>
47 #include <linux/serial_core.h>
48 #include <linux/kernel.h>
52 /**************************************************************/
54 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
56 cpm_command(port->command, cmd);
59 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
60 struct device_node *np)
67 /* Don't remap parameter RAM if it has already been initialized
68 * during console setup.
70 if (IS_SMC(port) && port->smcup)
72 else if (!IS_SMC(port) && port->sccup)
75 if (of_address_to_resource(np, 1, &res))
78 len = resource_size(&res);
79 pram = ioremap(res.start, len);
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",
95 offset = cpm_dpalloc(PROFF_SMC_SIZE, 64);
96 out_be16(pram, offset);
98 return cpm_muram_addr(offset);
101 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
108 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
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
113 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
117 unsigned long dp_offset;
119 dma_addr_t dma_addr = 0;
121 pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
123 dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
124 dp_offset = cpm_dpalloc(dpmemsz, 8);
125 if (IS_ERR_VALUE(dp_offset)) {
127 "cpm_uart_cpm.c: could not allocate buffer descriptors\n");
131 dp_mem = cpm_dpram_addr(dp_offset);
133 memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
134 L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
136 mem_addr = kzalloc(memsz, GFP_NOWAIT);
137 dma_addr = virt_to_bus(mem_addr);
140 mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
143 if (mem_addr == NULL) {
144 cpm_dpfree(dp_offset);
146 "cpm_uart_cpm.c: could not allocate coherent memory\n");
150 pinfo->dp_addr = dp_offset;
151 pinfo->mem_addr = mem_addr;
152 pinfo->dma_addr = dma_addr;
153 pinfo->mem_size = memsz;
155 pinfo->rx_buf = mem_addr;
156 pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
157 * pinfo->rx_fifosize);
159 pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
160 pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
165 void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
167 dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
168 pinfo->rx_fifosize) +
169 L1_CACHE_ALIGN(pinfo->tx_nrfifos *
170 pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
173 cpm_dpfree(pinfo->dp_addr);