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
cpm_line_cr_cmd(struct uart_cpm_port * port,int cmd)39 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
40 {
41 cpm_command(port->command, cmd);
42 }
43
cpm_uart_map_pram(struct uart_cpm_port * port,struct device_node * np)44 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
45 struct device_node *np)
46 {
47 return of_iomap(np, 1);
48 }
49
cpm_uart_unmap_pram(struct uart_cpm_port * port,void __iomem * pram)50 void 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 */
cpm_uart_allocbuf(struct uart_cpm_port * pinfo,unsigned int is_con)61 int 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
cpm_uart_freebuf(struct uart_cpm_port * pinfo)113 void 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 }
123