LXR linux/drivers/tty/serial/cpm_uart/cpm_uart

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 *  Driver for CPM (SCC/SMC) serial ports; CPM1 definitions
   4 *
   5 *  Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
   6 *              Pantelis Antoniou (panto@intracom.gr) (CPM1)
   7 *
   8 *  Copyright (C) 2004 Freescale Semiconductor, Inc.
   9 *            (C) 2004 Intracom, S.A.
  10 *            (C) 2006 MontaVista Software, Inc.
  11 *              Vitaly Bordug <vbordug@ru.mvista.com>
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/tty.h>
  16#include <linux/gfp.h>
  17#include <linux/ioport.h>
  18#include <linux/serial.h>
  19#include <linux/console.h>
  20#include <linux/sysrq.h>
  21#include <linux/device.h>
  22#include <linux/memblock.h>
  23#include <linux/dma-mapping.h>
  24
  25#include <asm/io.h>
  26#include <asm/irq.h>
  27#include <asm/fs_pd.h>
  28
  29#include <linux/serial_core.h>
  30#include <linux/kernel.h>
  31
  32#include <linux/of.h>
  33#include <linux/of_address.h>
  34
  35#include "cpm_uart.h"
  36
  37/**************************************************************/
  38
  39void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
  40{
  41        cpm_command(port->command, cmd);
  42}
  43
  44void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
  45                                struct device_node *np)
  46{
  47        return of_iomap(np, 1);
  48}
  49
  50void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
  51{
  52        iounmap(pram);
  53}
  54
  55/*
  56 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
  57 * receive buffer descriptors from dual port ram, and a character
  58 * buffer area from host mem. If we are allocating for the console we need
  59 * to do it from bootmem
  60 */
  61int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
  62{
  63        int dpmemsz, memsz;
  64        u8 *dp_mem;
  65        unsigned long dp_offset;
  66        u8 *mem_addr;
  67        dma_addr_t dma_addr = 0;
  68
  69        pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
  70
  71        dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
  72        dp_offset = cpm_dpalloc(dpmemsz, 8);
  73        if (IS_ERR_VALUE(dp_offset)) {
  74                printk(KERN_ERR
  75                       "cpm_uart_cpm1.c: could not allocate buffer descriptors\n");
  76                return -ENOMEM;
  77        }
  78        dp_mem = cpm_dpram_addr(dp_offset);
  79
  80        memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
  81            L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
  82        if (is_con) {
  83                /* was hostalloc but changed cause it blows away the */
  84                /* large tlb mapping when pinning the kernel area    */
  85                mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8));
  86                dma_addr = (u32)cpm_dpram_phys(mem_addr);
  87        } else
  88                mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
  89                                              GFP_KERNEL);
  90
  91        if (mem_addr == NULL) {
  92                cpm_dpfree(dp_offset);
  93                printk(KERN_ERR
  94                       "cpm_uart_cpm1.c: could not allocate coherent memory\n");
  95                return -ENOMEM;
  96        }
  97
  98        pinfo->dp_addr = dp_offset;
  99        pinfo->mem_addr = mem_addr;             /*  virtual address*/
 100        pinfo->dma_addr = dma_addr;             /*  physical address*/
 101        pinfo->mem_size = memsz;
 102
 103        pinfo->rx_buf = mem_addr;
 104        pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
 105                                                       * pinfo->rx_fifosize);
 106
 107        pinfo->rx_bd_base = (cbd_t __iomem __force *)dp_mem;
 108        pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
 109
 110        return 0;
 111}
 112
 113void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
 114{
 115        dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
 116                                                          pinfo->rx_fifosize) +
 117                          L1_CACHE_ALIGN(pinfo->tx_nrfifos *
 118                                         pinfo->tx_fifosize), pinfo->mem_addr,
 119                          pinfo->dma_addr);
 120
 121        cpm_dpfree(pinfo->dp_addr);
 122}
 123