158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
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*
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* Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
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* Pantelis Antoniou (panto@intracom.gr) (CPM1)
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*
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* Copyright (C) 2004 Freescale Semiconductor, Inc.
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* (C) 2004 Intracom, S.A.
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* (C) 2006 MontaVista Software, Inc.
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* Vitaly Bordug <vbordug@ru.mvista.com>
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*/
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/serial.h>
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#include <linux/console.h>
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#include <linux/sysrq.h>
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#include <linux/device.h>
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#include <linux/memblock.h>
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#include <linux/dma-mapping.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/fs_pd.h>
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#include <asm/prom.h>
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#include <linux/serial_core.h>
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#include <linux/kernel.h>
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#include "cpm_uart.h"
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/**************************************************************/
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void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
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{
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cpm_command(port->command, cmd);
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}
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void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
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struct device_node *np)
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{
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void __iomem *pram;
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unsigned long offset;
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struct resource res;
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resource_size_t len;
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/* Don't remap parameter RAM if it has already been initialized
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* during console setup.
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*/
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if (IS_SMC(port) && port->smcup)
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return port->smcup;
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else if (!IS_SMC(port) && port->sccup)
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return port->sccup;
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if (of_address_to_resource(np, 1, &res))
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return NULL;
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len = resource_size(&res);
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pram = ioremap(res.start, len);
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if (!pram)
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return NULL;
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if (!IS_SMC(port))
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return pram;
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if (len != 2) {
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printk(KERN_WARNING "cpm_uart[%d]: device tree references "
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"SMC pram, using boot loader/wrapper pram mapping. "
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"Please fix your device tree to reference the pram "
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"base register instead.\n",
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port->port.line);
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return pram;
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}
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offset = cpm_dpalloc(PROFF_SMC_SIZE, 64);
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out_be16(pram, offset);
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iounmap(pram);
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return cpm_muram_addr(offset);
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}
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void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
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{
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if (!IS_SMC(port))
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iounmap(pram);
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}
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/*
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* Allocate DP-Ram and memory buffers. We need to allocate a transmit and
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* receive buffer descriptors from dual port ram, and a character
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* buffer area from host mem. If we are allocating for the console we need
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* to do it from bootmem
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*/
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int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
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{
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int dpmemsz, memsz;
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u8 __iomem *dp_mem;
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unsigned long dp_offset;
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u8 *mem_addr;
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dma_addr_t dma_addr = 0;
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pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
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dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
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dp_offset = cpm_dpalloc(dpmemsz, 8);
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if (IS_ERR_VALUE(dp_offset)) {
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printk(KERN_ERR
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"cpm_uart_cpm.c: could not allocate buffer descriptors\n");
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return -ENOMEM;
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}
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dp_mem = cpm_dpram_addr(dp_offset);
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memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
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L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
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if (is_con) {
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mem_addr = kzalloc(memsz, GFP_NOWAIT);
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dma_addr = virt_to_bus(mem_addr);
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}
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else
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mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
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GFP_KERNEL);
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if (mem_addr == NULL) {
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cpm_dpfree(dp_offset);
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printk(KERN_ERR
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"cpm_uart_cpm.c: could not allocate coherent memory\n");
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return -ENOMEM;
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}
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pinfo->dp_addr = dp_offset;
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pinfo->mem_addr = mem_addr;
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pinfo->dma_addr = dma_addr;
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pinfo->mem_size = memsz;
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pinfo->rx_buf = mem_addr;
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pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
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* pinfo->rx_fifosize);
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pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
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pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
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return 0;
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}
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void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
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{
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dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
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pinfo->rx_fifosize) +
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L1_CACHE_ALIGN(pinfo->tx_nrfifos *
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pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
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pinfo->dma_addr);
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cpm_dpfree(pinfo->dp_addr);
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}
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