drivers/media/video/cx18/cx18-io.h

   1 /*
   2  *  cx18 driver PCI memory mapped IO access routines
   3  *
   4  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   5  *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20  *  02111-1307  USA
  21  */
  22
  23 #ifndef CX18_IO_H
  24 #define CX18_IO_H
  25
  26 #include "cx18-driver.h"
  27
  28 /*
  29  * Readback and retry of MMIO access for reliability:
  30  * The concept was suggested by Steve Toth <stoth@linuxtv.org>.
  31  * The implmentation is the fault of Andy Walls <awalls@md.metrocast.net>.
  32  *
  33  * *write* functions are implied to retry the mmio unless suffixed with _noretry
  34  * *read* functions never retry the mmio (it never helps to do so)
  35  */
  36
  37 /* Non byteswapping memory mapped IO */
  38 static inline u32 cx18_raw_readl(struct cx18 *cx, const void __iomem *addr)
  39 {
  40         return __raw_readl(addr);
  41 }
  42
  43 static inline
  44 void cx18_raw_writel_noretry(struct cx18 *cx, u32 val, void __iomem *addr)
  45 {
  46         __raw_writel(val, addr);
  47 }
  48
  49 static inline void cx18_raw_writel(struct cx18 *cx, u32 val, void __iomem *addr)
  50 {
  51         int i;
  52         for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) {
  53                 cx18_raw_writel_noretry(cx, val, addr);
  54                 if (val == cx18_raw_readl(cx, addr))
  55                         break;
  56         }
  57 }
  58
  59 /* Normal memory mapped IO */
  60 static inline u32 cx18_readl(struct cx18 *cx, const void __iomem *addr)
  61 {
  62         return readl(addr);
  63 }
  64
  65 static inline
  66 void cx18_writel_noretry(struct cx18 *cx, u32 val, void __iomem *addr)
  67 {
  68         writel(val, addr);
  69 }
  70
  71 static inline void cx18_writel(struct cx18 *cx, u32 val, void __iomem *addr)
  72 {
  73         int i;
  74         for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) {
  75                 cx18_writel_noretry(cx, val, addr);
  76                 if (val == cx18_readl(cx, addr))
  77                         break;
  78         }
  79 }
  80
  81 static inline
  82 void cx18_writel_expect(struct cx18 *cx, u32 val, void __iomem *addr,
  83                         u32 eval, u32 mask)
  84 {
  85         int i;
  86         u32 r;
  87         eval &= mask;
  88         for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) {
  89                 cx18_writel_noretry(cx, val, addr);
  90                 r = cx18_readl(cx, addr);
  91                 if (r == 0xffffffff && eval != 0xffffffff)
  92                         continue;
  93                 if (eval == (r & mask))
  94                         break;
  95         }
  96 }
  97
  98 static inline u16 cx18_readw(struct cx18 *cx, const void __iomem *addr)
  99 {
 100         return readw(addr);
 101 }
 102
 103 static inline
 104 void cx18_writew_noretry(struct cx18 *cx, u16 val, void __iomem *addr)
 105 {
 106         writew(val, addr);
 107 }
 108
 109 static inline void cx18_writew(struct cx18 *cx, u16 val, void __iomem *addr)
 110 {
 111         int i;
 112         for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) {
 113                 cx18_writew_noretry(cx, val, addr);
 114                 if (val == cx18_readw(cx, addr))
 115                         break;
 116         }
 117 }
 118
 119 static inline u8 cx18_readb(struct cx18 *cx, const void __iomem *addr)
 120 {
 121         return readb(addr);
 122 }
 123
 124 static inline
 125 void cx18_writeb_noretry(struct cx18 *cx, u8 val, void __iomem *addr)
 126 {
 127         writeb(val, addr);
 128 }
 129
 130 static inline void cx18_writeb(struct cx18 *cx, u8 val, void __iomem *addr)
 131 {
 132         int i;
 133         for (i = 0; i < CX18_MAX_MMIO_WR_RETRIES; i++) {
 134                 cx18_writeb_noretry(cx, val, addr);
 135                 if (val == cx18_readb(cx, addr))
 136                         break;
 137         }
 138 }
 139
 140 static inline
 141 void cx18_memcpy_fromio(struct cx18 *cx, void *to,
 142                         const void __iomem *from, unsigned int len)
 143 {
 144         memcpy_fromio(to, from, len);
 145 }
 146
 147 void cx18_memset_io(struct cx18 *cx, void __iomem *addr, int val, size_t count);
 148
 149
 150 /* Access "register" region of CX23418 memory mapped I/O */
 151 static inline void cx18_write_reg_noretry(struct cx18 *cx, u32 val, u32 reg)
 152 {
 153         cx18_writel_noretry(cx, val, cx->reg_mem + reg);
 154 }
 155
 156 static inline void cx18_write_reg(struct cx18 *cx, u32 val, u32 reg)
 157 {
 158         cx18_writel(cx, val, cx->reg_mem + reg);
 159 }
 160
 161 static inline void cx18_write_reg_expect(struct cx18 *cx, u32 val, u32 reg,
 162                                          u32 eval, u32 mask)
 163 {
 164         cx18_writel_expect(cx, val, cx->reg_mem + reg, eval, mask);
 165 }
 166
 167 static inline u32 cx18_read_reg(struct cx18 *cx, u32 reg)
 168 {
 169         return cx18_readl(cx, cx->reg_mem + reg);
 170 }
 171
 172
 173 /* Access "encoder memory" region of CX23418 memory mapped I/O */
 174 static inline void cx18_write_enc(struct cx18 *cx, u32 val, u32 addr)
 175 {
 176         cx18_writel(cx, val, cx->enc_mem + addr);
 177 }
 178
 179 static inline u32 cx18_read_enc(struct cx18 *cx, u32 addr)
 180 {
 181         return cx18_readl(cx, cx->enc_mem + addr);
 182 }
 183
 184 void cx18_sw1_irq_enable(struct cx18 *cx, u32 val);
 185 void cx18_sw1_irq_disable(struct cx18 *cx, u32 val);
 186 void cx18_sw2_irq_enable(struct cx18 *cx, u32 val);
 187 void cx18_sw2_irq_disable(struct cx18 *cx, u32 val);
 188 void cx18_sw2_irq_disable_cpu(struct cx18 *cx, u32 val);
 189 void cx18_setup_page(struct cx18 *cx, u32 addr);
 190
 191 #endif /* CX18_IO_H */