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157 lines
3.9 KiB
157 lines
3.9 KiB
// 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 ([email protected]) (CPM2) |
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* Pantelis Antoniou ([email protected]) (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 <[email protected]> |
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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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