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/gfp.h> 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> 44#include <asm/fs_pd.h> 45 46#include <linux/serial_core.h> 47#include <linux/kernel.h> 48 49#include <linux/of.h> 50 51#include "cpm_uart.h" 52 53/**************************************************************/ 54 55void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd) 56{ 57 cpm_command(port->command, cmd); 58} 59 60void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port, 61 struct device_node *np) 62{ 63 return of_iomap(np, 1); 64} 65 66void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram) 67{ 68 iounmap(pram); 69} 70 71/* 72 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and 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 */ 77int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con) 78{ 79 int dpmemsz, memsz; 80 u8 *dp_mem; 81 unsigned long dp_offset; 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); 89 if (IS_ERR_VALUE(dp_offset)) { 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) { 99 /* was hostalloc but changed cause it blows away the */ 100 /* large tlb mapping when pinning the kernel area */ 101 mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8)); 102 dma_addr = (u32)cpm_dpram_phys(mem_addr); 103 } else 104 mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr, 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; 115 pinfo->mem_addr = mem_addr; /* virtual address*/ 116 pinfo->dma_addr = dma_addr; /* physical address*/ 117 pinfo->mem_size = memsz; 118 119 pinfo->rx_buf = mem_addr; 120 pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos 121 * pinfo->rx_fifosize); 122 123 pinfo->rx_bd_base = (cbd_t __iomem __force *)dp_mem; 124 pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos; 125 126 return 0; 127} 128 129void cpm_uart_freebuf(struct uart_cpm_port *pinfo) 130{ 131 dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos * 132 pinfo->rx_fifosize) + 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} 139