serial/cpm_uart/cpm_uart.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  *  Driver for CPM (SCC/SMC) serial ports
0004  *
0005  *  Copyright (C) 2004 Freescale Semiconductor, Inc.
0006  *
0007  *  2006 (c) MontaVista Software, Inc.
0008  *  Vitaly Bordug <vbordug@ru.mvista.com>
0009  */
0010 #ifndef CPM_UART_H
0011 #define CPM_UART_H
0012
0013 #include <linux/platform_device.h>
0014 #include <linux/fs_uart_pd.h>
0015
0016 struct gpio_desc;
0017
0018 #if defined(CONFIG_CPM2)
0019 #include "cpm_uart_cpm2.h"
0020 #elif defined(CONFIG_CPM1)
0021 #include "cpm_uart_cpm1.h"
0022 #elif defined(CONFIG_COMPILE_TEST)
0023 #include "cpm_uart_cpm2.h"
0024 #endif
0025
0026 #define SERIAL_CPM_MAJOR    204
0027 #define SERIAL_CPM_MINOR    46
0028
0029 #define IS_SMC(pinfo)       (pinfo->flags & FLAG_SMC)
0030 #define IS_DISCARDING(pinfo)    (pinfo->flags & FLAG_DISCARDING)
0031 #define FLAG_DISCARDING 0x00000004  /* when set, don't discard */
0032 #define FLAG_SMC    0x00000002
0033 #define FLAG_CONSOLE    0x00000001
0034
0035 #define UART_SMC1   fsid_smc1_uart
0036 #define UART_SMC2   fsid_smc2_uart
0037 #define UART_SCC1   fsid_scc1_uart
0038 #define UART_SCC2   fsid_scc2_uart
0039 #define UART_SCC3   fsid_scc3_uart
0040 #define UART_SCC4   fsid_scc4_uart
0041
0042 #define UART_NR     fs_uart_nr
0043
0044 #define RX_NUM_FIFO 4
0045 #define RX_BUF_SIZE 32
0046 #define TX_NUM_FIFO 4
0047 #define TX_BUF_SIZE 32
0048
0049 #define SCC_WAIT_CLOSING 100
0050
0051 #define GPIO_CTS    0
0052 #define GPIO_RTS    1
0053 #define GPIO_DCD    2
0054 #define GPIO_DSR    3
0055 #define GPIO_DTR    4
0056 #define GPIO_RI     5
0057
0058 #define NUM_GPIOS   (GPIO_RI+1)
0059
0060 struct uart_cpm_port {
0061     struct uart_port    port;
0062     u16         rx_nrfifos;
0063     u16         rx_fifosize;
0064     u16         tx_nrfifos;
0065     u16         tx_fifosize;
0066     smc_t __iomem       *smcp;
0067     smc_uart_t __iomem  *smcup;
0068     scc_t __iomem       *sccp;
0069     scc_uart_t __iomem  *sccup;
0070     cbd_t __iomem       *rx_bd_base;
0071     cbd_t __iomem       *rx_cur;
0072     cbd_t __iomem       *tx_bd_base;
0073     cbd_t __iomem       *tx_cur;
0074     unsigned char       *tx_buf;
0075     unsigned char       *rx_buf;
0076     u32         flags;
0077     struct clk      *clk;
0078     u8          brg;
0079     uint             dp_addr;
0080     void            *mem_addr;
0081     dma_addr_t       dma_addr;
0082     u32         mem_size;
0083     /* wait on close if needed */
0084     int         wait_closing;
0085     /* value to combine with opcode to form cpm command */
0086     u32         command;
0087     struct gpio_desc    *gpios[NUM_GPIOS];
0088 };
0089
0090 extern int cpm_uart_nr;
0091 extern struct uart_cpm_port cpm_uart_ports[UART_NR];
0092
0093 /* these are located in their respective files */
0094 void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd);
0095 void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
0096                 struct device_node *np);
0097 void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram);
0098 int cpm_uart_init_portdesc(void);
0099 int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con);
0100 void cpm_uart_freebuf(struct uart_cpm_port *pinfo);
0101
0102 void smc1_lineif(struct uart_cpm_port *pinfo);
0103 void smc2_lineif(struct uart_cpm_port *pinfo);
0104 void scc1_lineif(struct uart_cpm_port *pinfo);
0105 void scc2_lineif(struct uart_cpm_port *pinfo);
0106 void scc3_lineif(struct uart_cpm_port *pinfo);
0107 void scc4_lineif(struct uart_cpm_port *pinfo);
0108
0109 /*
0110    virtual to phys transtalion
0111 */
0112 static inline unsigned long cpu2cpm_addr(void *addr,
0113                                          struct uart_cpm_port *pinfo)
0114 {
0115     int offset;
0116     u32 val = (u32)addr;
0117     u32 mem = (u32)pinfo->mem_addr;
0118     /* sane check */
0119     if (likely(val >= mem && val < mem + pinfo->mem_size)) {
0120         offset = val - mem;
0121         return pinfo->dma_addr + offset;
0122     }
0123     /* something nasty happened */
0124     BUG();
0125     return 0;
0126 }
0127
0128 static inline void *cpm2cpu_addr(unsigned long addr,
0129                                  struct uart_cpm_port *pinfo)
0130 {
0131     int offset;
0132     u32 val = addr;
0133     u32 dma = (u32)pinfo->dma_addr;
0134     /* sane check */
0135     if (likely(val >= dma && val < dma + pinfo->mem_size)) {
0136         offset = val - dma;
0137         return pinfo->mem_addr + offset;
0138     }
0139     /* something nasty happened */
0140     BUG();
0141     return NULL;
0142 }
0143
0144
0145 #endif /* CPM_UART_H */