cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cpm_uart_cpm1.c (3371B)

      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}