drivers/tty/serial/samsung.h

   1 #ifndef __SAMSUNG_H
   2 #define __SAMSUNG_H
   3
   4 /*
   5  * Driver for Samsung SoC onboard UARTs.
   6  *
   7  * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
   8  *      http://armlinux.simtec.co.uk/
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 */
  14
  15 #include <linux/dmaengine.h>
  16
  17 struct s3c24xx_uart_info {
  18         char                    *name;
  19         unsigned int            type;
  20         unsigned int            fifosize;
  21         unsigned long           rx_fifomask;
  22         unsigned long           rx_fifoshift;
  23         unsigned long           rx_fifofull;
  24         unsigned long           tx_fifomask;
  25         unsigned long           tx_fifoshift;
  26         unsigned long           tx_fifofull;
  27         unsigned int            def_clk_sel;
  28         unsigned long           num_clks;
  29         unsigned long           clksel_mask;
  30         unsigned long           clksel_shift;
  31
  32         /* uart port features */
  33
  34         unsigned int            has_divslot:1;
  35
  36         /* uart controls */
  37         int (*reset_port)(struct uart_port *, struct s3c2410_uartcfg *);
  38 };
  39
  40 struct s3c24xx_serial_drv_data {
  41         struct s3c24xx_uart_info        *info;
  42         struct s3c2410_uartcfg          *def_cfg;
  43         unsigned int                    fifosize[CONFIG_SERIAL_SAMSUNG_UARTS];
  44 };
  45
  46 struct s3c24xx_uart_dma {
  47         dma_filter_fn                   fn;
  48         void                            *rx_param;
  49         void                            *tx_param;
  50
  51         unsigned int                    rx_chan_id;
  52         unsigned int                    tx_chan_id;
  53
  54         struct dma_slave_config         rx_conf;
  55         struct dma_slave_config         tx_conf;
  56
  57         struct dma_chan                 *rx_chan;
  58         struct dma_chan                 *tx_chan;
  59
  60         dma_addr_t                      rx_addr;
  61         dma_addr_t                      tx_addr;
  62
  63         dma_cookie_t                    rx_cookie;
  64         dma_cookie_t                    tx_cookie;
  65
  66         char                            *rx_buf;
  67
  68         dma_addr_t                      tx_transfer_addr;
  69
  70         size_t                          rx_size;
  71         size_t                          tx_size;
  72
  73         struct dma_async_tx_descriptor  *tx_desc;
  74         struct dma_async_tx_descriptor  *rx_desc;
  75
  76         int                             tx_bytes_requested;
  77         int                             rx_bytes_requested;
  78 };
  79
  80 struct s3c24xx_uart_port {
  81         unsigned char                   rx_claimed;
  82         unsigned char                   tx_claimed;
  83         unsigned int                    pm_level;
  84         unsigned long                   baudclk_rate;
  85         unsigned int                    min_dma_size;
  86
  87         unsigned int                    rx_irq;
  88         unsigned int                    tx_irq;
  89
  90         unsigned int                    tx_in_progress;
  91         unsigned int                    tx_mode;
  92         unsigned int                    rx_mode;
  93
  94         struct s3c24xx_uart_info        *info;
  95         struct clk                      *clk;
  96         struct clk                      *baudclk;
  97         struct uart_port                port;
  98         struct s3c24xx_serial_drv_data  *drv_data;
  99
 100         /* reference to platform data */
 101         struct s3c2410_uartcfg          *cfg;
 102
 103         struct s3c24xx_uart_dma         *dma;
 104
 105 #ifdef CONFIG_CPU_FREQ
 106         struct notifier_block           freq_transition;
 107 #endif
 108 };
 109
 110 /* conversion functions */
 111
 112 #define s3c24xx_dev_to_port(__dev) dev_get_drvdata(__dev)
 113
 114 /* register access controls */
 115
 116 #define portaddr(port, reg) ((port)->membase + (reg))
 117 #define portaddrl(port, reg) \
 118         ((unsigned long *)(unsigned long)((port)->membase + (reg)))
 119
 120 #define rd_regb(port, reg) (readb_relaxed(portaddr(port, reg)))
 121 #define rd_regl(port, reg) (readl_relaxed(portaddr(port, reg)))
 122
 123 #define wr_regb(port, reg, val) writeb_relaxed(val, portaddr(port, reg))
 124 #define wr_regl(port, reg, val) writel_relaxed(val, portaddr(port, reg))
 125
 126 /* Byte-order aware bit setting/clearing functions. */
 127
 128 static inline void s3c24xx_set_bit(struct uart_port *port, int idx,
 129                                    unsigned int reg)
 130 {
 131         unsigned long flags;
 132         u32 val;
 133
 134         local_irq_save(flags);
 135         val = rd_regl(port, reg);
 136         val |= (1 << idx);
 137         wr_regl(port, reg, val);
 138         local_irq_restore(flags);
 139 }
 140
 141 static inline void s3c24xx_clear_bit(struct uart_port *port, int idx,
 142                                      unsigned int reg)
 143 {
 144         unsigned long flags;
 145         u32 val;
 146
 147         local_irq_save(flags);
 148         val = rd_regl(port, reg);
 149         val &= ~(1 << idx);
 150         wr_regl(port, reg, val);
 151         local_irq_restore(flags);
 152 }
 153
 154 #endif