arch/avr32/mach-at32ap/hmatrix.c

   1 /*
   2  * High-Speed Bus Matrix helper functions
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/clk.h>
  11 #include <linux/io.h>
  12
  13 #include <mach/chip.h>
  14 #include <mach/hmatrix.h>
  15
  16 static inline void __hmatrix_write_reg(unsigned long offset, u32 value)
  17 {
  18         __raw_writel(value, (void __iomem __force *)(HMATRIX_BASE + offset));
  19 }
  20
  21 static inline u32 __hmatrix_read_reg(unsigned long offset)
  22 {
  23         return __raw_readl((void __iomem __force *)(HMATRIX_BASE + offset));
  24 }
  25
  26 /**
  27  * hmatrix_write_reg - write HMATRIX configuration register
  28  * @offset: register offset
  29  * @value: value to be written to the register at @offset
  30  */
  31 void hmatrix_write_reg(unsigned long offset, u32 value)
  32 {
  33         clk_enable(&at32_hmatrix_clk);
  34         __hmatrix_write_reg(offset, value);
  35         __hmatrix_read_reg(offset);
  36         clk_disable(&at32_hmatrix_clk);
  37 }
  38
  39 /**
  40  * hmatrix_read_reg - read HMATRIX configuration register
  41  * @offset: register offset
  42  *
  43  * Returns the value of the register at @offset.
  44  */
  45 u32 hmatrix_read_reg(unsigned long offset)
  46 {
  47         u32 value;
  48
  49         clk_enable(&at32_hmatrix_clk);
  50         value = __hmatrix_read_reg(offset);
  51         clk_disable(&at32_hmatrix_clk);
  52
  53         return value;
  54 }
  55
  56 /**
  57  * hmatrix_sfr_set_bits - set bits in a slave's Special Function Register
  58  * @slave_id: operate on the SFR belonging to this slave
  59  * @mask: mask of bits to be set in the SFR
  60  */
  61 void hmatrix_sfr_set_bits(unsigned int slave_id, u32 mask)
  62 {
  63         u32 value;
  64
  65         clk_enable(&at32_hmatrix_clk);
  66         value = __hmatrix_read_reg(HMATRIX_SFR(slave_id));
  67         value |= mask;
  68         __hmatrix_write_reg(HMATRIX_SFR(slave_id), value);
  69         __hmatrix_read_reg(HMATRIX_SFR(slave_id));
  70         clk_disable(&at32_hmatrix_clk);
  71 }
  72
  73 /**
  74  * hmatrix_sfr_set_bits - clear bits in a slave's Special Function Register
  75  * @slave_id: operate on the SFR belonging to this slave
  76  * @mask: mask of bits to be cleared in the SFR
  77  */
  78 void hmatrix_sfr_clear_bits(unsigned int slave_id, u32 mask)
  79 {
  80         u32 value;
  81
  82         clk_enable(&at32_hmatrix_clk);
  83         value = __hmatrix_read_reg(HMATRIX_SFR(slave_id));
  84         value &= ~mask;
  85         __hmatrix_write_reg(HMATRIX_SFR(slave_id), value);
  86         __hmatrix_read_reg(HMATRIX_SFR(slave_id));
  87         clk_disable(&at32_hmatrix_clk);
  88 }