1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Driver for CPM (SCC/SMC) serial ports
4 *
5 * Copyright (C) 2004 Freescale Semiconductor, Inc.
6 *
7 * 2006 (c) MontaVista Software, Inc.
8 * Vitaly Bordug <vbordug@ru.mvista.com>
9 */
10 #ifndef CPM_UART_H
11 #define CPM_UART_H
12
13 #include <linux/platform_device.h>
14 #include <linux/fs_uart_pd.h>
15
16 struct gpio_desc;
17
18 #if defined(CONFIG_CPM2)
19 #include "cpm_uart_cpm2.h"
20 #elif defined(CONFIG_CPM1)
21 #include "cpm_uart_cpm1.h"
22 #elif defined(CONFIG_COMPILE_TEST)
23 #include "cpm_uart_cpm2.h"
24 #endif
25
26 #define SERIAL_CPM_MAJOR 204
27 #define SERIAL_CPM_MINOR 46
28
29 #define IS_SMC(pinfo) (pinfo->flags & FLAG_SMC)
30 #define IS_DISCARDING(pinfo) (pinfo->flags & FLAG_DISCARDING)
31 #define FLAG_DISCARDING 0x00000004 /* when set, don't discard */
32 #define FLAG_SMC 0x00000002
33 #define FLAG_CONSOLE 0x00000001
34
35 #define UART_SMC1 fsid_smc1_uart
36 #define UART_SMC2 fsid_smc2_uart
37 #define UART_SCC1 fsid_scc1_uart
38 #define UART_SCC2 fsid_scc2_uart
39 #define UART_SCC3 fsid_scc3_uart
40 #define UART_SCC4 fsid_scc4_uart
41
42 #define UART_NR fs_uart_nr
43
44 #define RX_NUM_FIFO 4
45 #define RX_BUF_SIZE 32
46 #define TX_NUM_FIFO 4
47 #define TX_BUF_SIZE 32
48
49 #define SCC_WAIT_CLOSING 100
50
51 #define GPIO_CTS 0
52 #define GPIO_RTS 1
53 #define GPIO_DCD 2
54 #define GPIO_DSR 3
55 #define GPIO_DTR 4
56 #define GPIO_RI 5
57
58 #define NUM_GPIOS (GPIO_RI+1)
59
60 struct uart_cpm_port {
61 struct uart_port port;
62 u16 rx_nrfifos;
63 u16 rx_fifosize;
64 u16 tx_nrfifos;
65 u16 tx_fifosize;
66 smc_t __iomem *smcp;
67 smc_uart_t __iomem *smcup;
68 scc_t __iomem *sccp;
69 scc_uart_t __iomem *sccup;
70 cbd_t __iomem *rx_bd_base;
71 cbd_t __iomem *rx_cur;
72 cbd_t __iomem *tx_bd_base;
73 cbd_t __iomem *tx_cur;
74 unsigned char *tx_buf;
75 unsigned char *rx_buf;
76 u32 flags;
77 struct clk *clk;
78 u8 brg;
79 uint dp_addr;
80 void *mem_addr;
81 dma_addr_t dma_addr;
82 u32 mem_size;
83 /* wait on close if needed */
84 int wait_closing;
85 /* value to combine with opcode to form cpm command */
86 u32 command;
87 struct gpio_desc *gpios[NUM_GPIOS];
88 };
89
90 extern struct uart_cpm_port cpm_uart_ports[UART_NR];
91
92 /* these are located in their respective files */
93 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd);
94 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
95 struct device_node *np);
96 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram);
97 int cpm_uart_init_portdesc(void);
98 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con);
99 void cpm_uart_freebuf(struct uart_cpm_port *pinfo);
100
101 void smc1_lineif(struct uart_cpm_port *pinfo);
102 void smc2_lineif(struct uart_cpm_port *pinfo);
103 void scc1_lineif(struct uart_cpm_port *pinfo);
104 void scc2_lineif(struct uart_cpm_port *pinfo);
105 void scc3_lineif(struct uart_cpm_port *pinfo);
106 void scc4_lineif(struct uart_cpm_port *pinfo);
107
108 /*
109 virtual to phys transtalion
110 */
cpu2cpm_addr(void * addr,struct uart_cpm_port * pinfo)111 static inline unsigned long cpu2cpm_addr(void *addr,
112 struct uart_cpm_port *pinfo)
113 {
114 int offset;
115 u32 val = (u32)addr;
116 u32 mem = (u32)pinfo->mem_addr;
117 /* sane check */
118 if (likely(val >= mem && val < mem + pinfo->mem_size)) {
119 offset = val - mem;
120 return pinfo->dma_addr + offset;
121 }
122 /* something nasty happened */
123 BUG();
124 return 0;
125 }
126
cpm2cpu_addr(unsigned long addr,struct uart_cpm_port * pinfo)127 static inline void *cpm2cpu_addr(unsigned long addr,
128 struct uart_cpm_port *pinfo)
129 {
130 int offset;
131 u32 val = addr;
132 u32 dma = (u32)pinfo->dma_addr;
133 /* sane check */
134 if (likely(val >= dma && val < dma + pinfo->mem_size)) {
135 offset = val - dma;
136 return pinfo->mem_addr + offset;
137 }
138 /* something nasty happened */
139 BUG();
140 return NULL;
141 }
142
143
144 #endif /* CPM_UART_H */
145
