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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
39void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
40{
41 cpm_command(port->command, cmd);
42}
43
44void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
45 struct device_node *np)
46{
47 return of_iomap(np, 1);
48}
49
50void 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 */
61int 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
113void 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}
1/*
2 * Driver for CPM (SCC/SMC) serial ports; CPM1 definitions
3 *
4 * Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
5 * Pantelis Antoniou (panto@intracom.gr) (CPM1)
6 *
7 * Copyright (C) 2004 Freescale Semiconductor, Inc.
8 * (C) 2004 Intracom, S.A.
9 * (C) 2006 MontaVista Software, Inc.
10 * Vitaly Bordug <vbordug@ru.mvista.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 */
27
28#include <linux/module.h>
29#include <linux/tty.h>
30#include <linux/gfp.h>
31#include <linux/ioport.h>
32#include <linux/serial.h>
33#include <linux/console.h>
34#include <linux/sysrq.h>
35#include <linux/device.h>
36#include <linux/bootmem.h>
37#include <linux/dma-mapping.h>
38
39#include <asm/io.h>
40#include <asm/irq.h>
41#include <asm/fs_pd.h>
42
43#include <linux/serial_core.h>
44#include <linux/kernel.h>
45
46#include <linux/of.h>
47#include <linux/of_address.h>
48
49#include "cpm_uart.h"
50
51/**************************************************************/
52
53void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
54{
55 cpm_command(port->command, cmd);
56}
57
58void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
59 struct device_node *np)
60{
61 return of_iomap(np, 1);
62}
63
64void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
65{
66 iounmap(pram);
67}
68
69/*
70 * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
71 * receive buffer descriptors from dual port ram, and a character
72 * buffer area from host mem. If we are allocating for the console we need
73 * to do it from bootmem
74 */
75int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
76{
77 int dpmemsz, memsz;
78 u8 *dp_mem;
79 unsigned long dp_offset;
80 u8 *mem_addr;
81 dma_addr_t dma_addr = 0;
82
83 pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
84
85 dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
86 dp_offset = cpm_dpalloc(dpmemsz, 8);
87 if (IS_ERR_VALUE(dp_offset)) {
88 printk(KERN_ERR
89 "cpm_uart_cpm1.c: could not allocate buffer descriptors\n");
90 return -ENOMEM;
91 }
92 dp_mem = cpm_dpram_addr(dp_offset);
93
94 memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
95 L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
96 if (is_con) {
97 /* was hostalloc but changed cause it blows away the */
98 /* large tlb mapping when pinning the kernel area */
99 mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8));
100 dma_addr = (u32)cpm_dpram_phys(mem_addr);
101 } else
102 mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
103 GFP_KERNEL);
104
105 if (mem_addr == NULL) {
106 cpm_dpfree(dp_offset);
107 printk(KERN_ERR
108 "cpm_uart_cpm1.c: could not allocate coherent memory\n");
109 return -ENOMEM;
110 }
111
112 pinfo->dp_addr = dp_offset;
113 pinfo->mem_addr = mem_addr; /* virtual address*/
114 pinfo->dma_addr = dma_addr; /* physical address*/
115 pinfo->mem_size = memsz;
116
117 pinfo->rx_buf = mem_addr;
118 pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
119 * pinfo->rx_fifosize);
120
121 pinfo->rx_bd_base = (cbd_t __iomem __force *)dp_mem;
122 pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
123
124 return 0;
125}
126
127void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
128{
129 dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
130 pinfo->rx_fifosize) +
131 L1_CACHE_ALIGN(pinfo->tx_nrfifos *
132 pinfo->tx_fifosize), pinfo->mem_addr,
133 pinfo->dma_addr);
134
135 cpm_dpfree(pinfo->dp_addr);
136}