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}