diff options
Diffstat (limited to 'drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c')
| -rw-r--r-- | drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c new file mode 100644 index 000000000..6a1cd03bf --- /dev/null +++ b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c @@ -0,0 +1,157 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for CPM (SCC/SMC) serial ports; CPM2 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/ioport.h> +#include <linux/slab.h> +#include <linux/serial.h> +#include <linux/console.h> +#include <linux/sysrq.h> +#include <linux/device.h> +#include <linux/memblock.h> +#include <linux/dma-mapping.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/fs_pd.h> +#include <asm/prom.h> + +#include <linux/serial_core.h> +#include <linux/kernel.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) +{ + void __iomem *pram; + unsigned long offset; + struct resource res; + resource_size_t len; + + /* Don't remap parameter RAM if it has already been initialized + * during console setup. + */ + if (IS_SMC(port) && port->smcup) + return port->smcup; + else if (!IS_SMC(port) && port->sccup) + return port->sccup; + + if (of_address_to_resource(np, 1, &res)) + return NULL; + + len = resource_size(&res); + pram = ioremap(res.start, len); + if (!pram) + return NULL; + + if (!IS_SMC(port)) + return pram; + + if (len != 2) { + printk(KERN_WARNING "cpm_uart[%d]: device tree references " + "SMC pram, using boot loader/wrapper pram mapping. " + "Please fix your device tree to reference the pram " + "base register instead.\n", + port->port.line); + return pram; + } + + offset = cpm_dpalloc(PROFF_SMC_SIZE, 64); + out_be16(pram, offset); + iounmap(pram); + return cpm_muram_addr(offset); +} + +void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram) +{ + if (!IS_SMC(port)) + 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 __iomem *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_cpm.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) { + mem_addr = kzalloc(memsz, GFP_NOWAIT); + dma_addr = virt_to_bus(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_cpm.c: could not allocate coherent memory\n"); + return -ENOMEM; + } + + pinfo->dp_addr = dp_offset; + pinfo->mem_addr = mem_addr; + pinfo->dma_addr = dma_addr; + 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 *)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), (void __force *)pinfo->mem_addr, + pinfo->dma_addr); + + cpm_dpfree(pinfo->dp_addr); +} |