1 /*
2  *  Driver for CPM (SCC/SMC) serial ports
3  *
4  *  Copyright (C) 2004 Freescale Semiconductor, Inc.
5  *
6  *  2006 (c) MontaVista Software, Inc.
7  *	Vitaly Bordug <vbordug@ru.mvista.com>
8  *
9  * This file is licensed under the terms of the GNU General Public License
10  * version 2. This program is licensed "as is" without any warranty of any
11  * kind, whether express or implied.
12  *
13  */
14 #ifndef CPM_UART_H
15 #define CPM_UART_H
16 
17 #include <linux/platform_device.h>
18 #include <linux/fs_uart_pd.h>
19 
20 #if defined(CONFIG_CPM2)
21 #include "cpm_uart_cpm2.h"
22 #elif defined(CONFIG_8xx)
23 #include "cpm_uart_cpm1.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 	int			gpios[NUM_GPIOS];
88 };
89 
90 extern int cpm_uart_nr;
91 extern struct uart_cpm_port cpm_uart_ports[UART_NR];
92 
93 /* these are located in their respective files */
94 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd);
95 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
96 				struct device_node *np);
97 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram);
98 int cpm_uart_init_portdesc(void);
99 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con);
100 void cpm_uart_freebuf(struct uart_cpm_port *pinfo);
101 
102 void smc1_lineif(struct uart_cpm_port *pinfo);
103 void smc2_lineif(struct uart_cpm_port *pinfo);
104 void scc1_lineif(struct uart_cpm_port *pinfo);
105 void scc2_lineif(struct uart_cpm_port *pinfo);
106 void scc3_lineif(struct uart_cpm_port *pinfo);
107 void scc4_lineif(struct uart_cpm_port *pinfo);
108 
109 /*
110    virtual to phys transtalion
111 */
cpu2cpm_addr(void * addr,struct uart_cpm_port * pinfo)112 static inline unsigned long cpu2cpm_addr(void *addr,
113                                          struct uart_cpm_port *pinfo)
114 {
115 	int offset;
116 	u32 val = (u32)addr;
117 	u32 mem = (u32)pinfo->mem_addr;
118 	/* sane check */
119 	if (likely(val >= mem && val < mem + pinfo->mem_size)) {
120 		offset = val - mem;
121 		return pinfo->dma_addr + offset;
122 	}
123 	/* something nasty happened */
124 	BUG();
125 	return 0;
126 }
127 
cpm2cpu_addr(unsigned long addr,struct uart_cpm_port * pinfo)128 static inline void *cpm2cpu_addr(unsigned long addr,
129                                  struct uart_cpm_port *pinfo)
130 {
131 	int offset;
132 	u32 val = addr;
133 	u32 dma = (u32)pinfo->dma_addr;
134 	/* sane check */
135 	if (likely(val >= dma && val < dma + pinfo->mem_size)) {
136 		offset = val - dma;
137 		return pinfo->mem_addr + offset;
138 	}
139 	/* something nasty happened */
140 	BUG();
141 	return NULL;
142 }
143 
144 
145 #endif /* CPM_UART_H */
146