1 /*
2 * linux/drivers/serial/cpm_uart.h
3 *
4 * Driver for CPM (SCC/SMC) serial ports
5 *
6 * Copyright (C) 2004 Freescale Semiconductor, Inc.
7 *
8 * 2006 (c) MontaVista Software, Inc.
9 * Vitaly Bordug <vbordug@ru.mvista.com>
10 *
11 * This file is licensed under the terms of the GNU General Public License
12 * version 2. This program is licensed "as is" without any warranty of any
13 * kind, whether express or implied.
14 *
15 */
16 #ifndef CPM_UART_H
17 #define CPM_UART_H
18
19 #include <linux/platform_device.h>
20 #include <linux/fs_uart_pd.h>
21
22 #if defined(CONFIG_CPM2)
23 #include "cpm_uart_cpm2.h"
24 #elif defined(CONFIG_8xx)
25 #include "cpm_uart_cpm1.h"
26 #endif
27
28 #define SERIAL_CPM_MAJOR 204
29 #define SERIAL_CPM_MINOR 46
30
31 #define IS_SMC(pinfo) (pinfo->flags & FLAG_SMC)
32 #define IS_DISCARDING(pinfo) (pinfo->flags & FLAG_DISCARDING)
33 #define FLAG_DISCARDING 0x00000004 /* when set, don't discard */
34 #define FLAG_SMC 0x00000002
35 #define FLAG_CONSOLE 0x00000001
36
37 #define UART_SMC1 fsid_smc1_uart
38 #define UART_SMC2 fsid_smc2_uart
39 #define UART_SCC1 fsid_scc1_uart
40 #define UART_SCC2 fsid_scc2_uart
41 #define UART_SCC3 fsid_scc3_uart
42 #define UART_SCC4 fsid_scc4_uart
43
44 #define UART_NR fs_uart_nr
45
46 #define RX_NUM_FIFO 4
47 #define RX_BUF_SIZE 32
48 #define TX_NUM_FIFO 4
49 #define TX_BUF_SIZE 32
50
51 #define SCC_WAIT_CLOSING 100
52
53 #define GPIO_CTS 0
54 #define GPIO_RTS 1
55 #define GPIO_DCD 2
56 #define GPIO_DSR 3
57 #define GPIO_DTR 4
58 #define GPIO_RI 5
59
60 #define NUM_GPIOS (GPIO_RI+1)
61
62 struct uart_cpm_port {
63 struct uart_port port;
64 u16 rx_nrfifos;
65 u16 rx_fifosize;
66 u16 tx_nrfifos;
67 u16 tx_fifosize;
68 smc_t __iomem *smcp;
69 smc_uart_t __iomem *smcup;
70 scc_t __iomem *sccp;
71 scc_uart_t __iomem *sccup;
72 cbd_t __iomem *rx_bd_base;
73 cbd_t __iomem *rx_cur;
74 cbd_t __iomem *tx_bd_base;
75 cbd_t __iomem *tx_cur;
76 unsigned char *tx_buf;
77 unsigned char *rx_buf;
78 u32 flags;
79 void (*set_lineif)(struct uart_cpm_port *);
80 struct clk *clk;
81 u8 brg;
82 uint dp_addr;
83 void *mem_addr;
84 dma_addr_t dma_addr;
85 u32 mem_size;
86 /* helpers */
87 int baud;
88 int bits;
89 /* Keep track of 'odd' SMC2 wirings */
90 int is_portb;
91 /* wait on close if needed */
92 int wait_closing;
93 /* value to combine with opcode to form cpm command */
94 u32 command;
95 int gpios[NUM_GPIOS];
96 };
97
98 extern int cpm_uart_nr;
99 extern struct uart_cpm_port cpm_uart_ports[UART_NR];
100
101 /* these are located in their respective files */
102 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd);
103 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
104 struct device_node *np);
105 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram);
106 int cpm_uart_init_portdesc(void);
107 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con);
108 void cpm_uart_freebuf(struct uart_cpm_port *pinfo);
109
110 void smc1_lineif(struct uart_cpm_port *pinfo);
111 void smc2_lineif(struct uart_cpm_port *pinfo);
112 void scc1_lineif(struct uart_cpm_port *pinfo);
113 void scc2_lineif(struct uart_cpm_port *pinfo);
114 void scc3_lineif(struct uart_cpm_port *pinfo);
115 void scc4_lineif(struct uart_cpm_port *pinfo);
116
117 /*
118 virtual to phys transtalion
119 */
cpu2cpm_addr(void * addr,struct uart_cpm_port * pinfo)120 static inline unsigned long cpu2cpm_addr(void *addr,
121 struct uart_cpm_port *pinfo)
122 {
123 int offset;
124 u32 val = (u32)addr;
125 u32 mem = (u32)pinfo->mem_addr;
126 /* sane check */
127 if (likely(val >= mem && val < mem + pinfo->mem_size)) {
128 offset = val - mem;
129 return pinfo->dma_addr + offset;
130 }
131 /* something nasty happened */
132 BUG();
133 return 0;
134 }
135
cpm2cpu_addr(unsigned long addr,struct uart_cpm_port * pinfo)136 static inline void *cpm2cpu_addr(unsigned long addr,
137 struct uart_cpm_port *pinfo)
138 {
139 int offset;
140 u32 val = addr;
141 u32 dma = (u32)pinfo->dma_addr;
142 /* sane check */
143 if (likely(val >= dma && val < dma + pinfo->mem_size)) {
144 offset = val - dma;
145 return pinfo->mem_addr + offset;
146 }
147 /* something nasty happened */
148 BUG();
149 return NULL;
150 }
151
152
153 #endif /* CPM_UART_H */
154