123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Driver for CPM (SCC/SMC) serial ports; CPM1 definitions
|
|
*
|
|
* Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
|
|
* Pantelis Antoniou (panto@intracom.gr) (CPM1)
|
|
*
|
|
* Copyright (C) 2004 Freescale Semiconductor, Inc.
|
|
* (C) 2004 Intracom, S.A.
|
|
* (C) 2006 MontaVista Software, Inc.
|
|
* Vitaly Bordug <vbordug@ru.mvista.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/console.h>
|
|
#include <linux/sysrq.h>
|
|
#include <linux/device.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/dma-mapping.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/fs_pd.h>
|
|
|
|
#include <linux/serial_core.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
|
|
#include "cpm_uart.h"
|
|
|
|
/**************************************************************/
|
|
|
|
void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
|
|
{
|
|
cpm_command(port->command, cmd);
|
|
}
|
|
|
|
void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
|
|
struct device_node *np)
|
|
{
|
|
return of_iomap(np, 1);
|
|
}
|
|
|
|
void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
|
|
{
|
|
iounmap(pram);
|
|
}
|
|
|
|
/*
|
|
* Allocate DP-Ram and memory buffers. We need to allocate a transmit and
|
|
* receive buffer descriptors from dual port ram, and a character
|
|
* buffer area from host mem. If we are allocating for the console we need
|
|
* to do it from bootmem
|
|
*/
|
|
int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
|
|
{
|
|
int dpmemsz, memsz;
|
|
u8 *dp_mem;
|
|
unsigned long dp_offset;
|
|
u8 *mem_addr;
|
|
dma_addr_t dma_addr = 0;
|
|
|
|
pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
|
|
|
|
dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
|
|
dp_offset = cpm_dpalloc(dpmemsz, 8);
|
|
if (IS_ERR_VALUE(dp_offset)) {
|
|
printk(KERN_ERR
|
|
"cpm_uart_cpm1.c: could not allocate buffer descriptors\n");
|
|
return -ENOMEM;
|
|
}
|
|
dp_mem = cpm_dpram_addr(dp_offset);
|
|
|
|
memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
|
|
L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
|
|
if (is_con) {
|
|
/* was hostalloc but changed cause it blows away the */
|
|
/* large tlb mapping when pinning the kernel area */
|
|
mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8));
|
|
dma_addr = (u32)cpm_dpram_phys(mem_addr);
|
|
} else
|
|
mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
|
|
GFP_KERNEL);
|
|
|
|
if (mem_addr == NULL) {
|
|
cpm_dpfree(dp_offset);
|
|
printk(KERN_ERR
|
|
"cpm_uart_cpm1.c: could not allocate coherent memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pinfo->dp_addr = dp_offset;
|
|
pinfo->mem_addr = mem_addr; /* virtual address*/
|
|
pinfo->dma_addr = dma_addr; /* physical address*/
|
|
pinfo->mem_size = memsz;
|
|
|
|
pinfo->rx_buf = mem_addr;
|
|
pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
|
|
* pinfo->rx_fifosize);
|
|
|
|
pinfo->rx_bd_base = (cbd_t __iomem __force *)dp_mem;
|
|
pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
|
|
{
|
|
dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
|
|
pinfo->rx_fifosize) +
|
|
L1_CACHE_ALIGN(pinfo->tx_nrfifos *
|
|
pinfo->tx_fifosize), pinfo->mem_addr,
|
|
pinfo->dma_addr);
|
|
|
|
cpm_dpfree(pinfo->dp_addr);
|
|
}
|