drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c

   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/bootmem.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
  39 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
  40 {
  41         cpm_command(port->command, cmd);
  42 }
  43
  44 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
  45                                 struct device_node *np)
  46 {
  47         return of_iomap(np, 1);
  48 }
  49
  50 void 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  */
  61 int 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
 113 void 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 }