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cpm_uart.h
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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 <[email protected]>
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 */
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 
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 */
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