include/linux/sh_clk.h

   1 #ifndef __SH_CLOCK_H
   2 #define __SH_CLOCK_H
   3
   4 #include <linux/list.h>
   5 #include <linux/seq_file.h>
   6 #include <linux/cpufreq.h>
   7 #include <linux/types.h>
   8 #include <linux/kref.h>
   9 #include <linux/clk.h>
  10 #include <linux/err.h>
  11
  12 struct clk;
  13
  14 struct clk_mapping {
  15         phys_addr_t             phys;
  16         void __iomem            *base;
  17         unsigned long           len;
  18         struct kref             ref;
  19 };
  20
  21 struct sh_clk_ops {
  22 #ifdef CONFIG_SH_CLK_CPG_LEGACY
  23         void (*init)(struct clk *clk);
  24 #endif
  25         int (*enable)(struct clk *clk);
  26         void (*disable)(struct clk *clk);
  27         unsigned long (*recalc)(struct clk *clk);
  28         int (*set_rate)(struct clk *clk, unsigned long rate);
  29         int (*set_parent)(struct clk *clk, struct clk *parent);
  30         long (*round_rate)(struct clk *clk, unsigned long rate);
  31 };
  32
  33 #define SH_CLK_DIV_MSK(div)     ((1 << (div)) - 1)
  34 #define SH_CLK_DIV4_MSK         SH_CLK_DIV_MSK(4)
  35 #define SH_CLK_DIV6_MSK         SH_CLK_DIV_MSK(6)
  36
  37 struct clk {
  38         struct list_head        node;
  39         struct clk              *parent;
  40         struct clk              **parent_table; /* list of parents to */
  41         unsigned short          parent_num;     /* choose between */
  42         unsigned char           src_shift;      /* source clock field in the */
  43         unsigned char           src_width;      /* configuration register */
  44         struct sh_clk_ops       *ops;
  45
  46         struct list_head        children;
  47         struct list_head        sibling;        /* node for children */
  48
  49         int                     usecount;
  50
  51         unsigned long           rate;
  52         unsigned long           flags;
  53
  54         void __iomem            *enable_reg;
  55         unsigned int            enable_bit;
  56         void __iomem            *mapped_reg;
  57
  58         unsigned int            div_mask;
  59         unsigned long           arch_flags;
  60         void                    *priv;
  61         struct clk_mapping      *mapping;
  62         struct cpufreq_frequency_table *freq_table;
  63         unsigned int            nr_freqs;
  64 };
  65
  66 #define CLK_ENABLE_ON_INIT      BIT(0)
  67
  68 #define CLK_ENABLE_REG_32BIT    BIT(1)  /* default access size */
  69 #define CLK_ENABLE_REG_16BIT    BIT(2)
  70 #define CLK_ENABLE_REG_8BIT     BIT(3)
  71
  72 #define CLK_MASK_DIV_ON_DISABLE BIT(4)
  73
  74 #define CLK_ENABLE_REG_MASK     (CLK_ENABLE_REG_32BIT | \
  75                                  CLK_ENABLE_REG_16BIT | \
  76                                  CLK_ENABLE_REG_8BIT)
  77
  78 /* drivers/sh/clk.c */
  79 unsigned long followparent_recalc(struct clk *);
  80 void recalculate_root_clocks(void);
  81 void propagate_rate(struct clk *);
  82 int clk_reparent(struct clk *child, struct clk *parent);
  83 int clk_register(struct clk *);
  84 void clk_unregister(struct clk *);
  85 void clk_enable_init_clocks(void);
  86
  87 struct clk_div_mult_table {
  88         unsigned int *divisors;
  89         unsigned int nr_divisors;
  90         unsigned int *multipliers;
  91         unsigned int nr_multipliers;
  92 };
  93
  94 struct cpufreq_frequency_table;
  95 void clk_rate_table_build(struct clk *clk,
  96                           struct cpufreq_frequency_table *freq_table,
  97                           int nr_freqs,
  98                           struct clk_div_mult_table *src_table,
  99                           unsigned long *bitmap);
 100
 101 long clk_rate_table_round(struct clk *clk,
 102                           struct cpufreq_frequency_table *freq_table,
 103                           unsigned long rate);
 104
 105 int clk_rate_table_find(struct clk *clk,
 106                         struct cpufreq_frequency_table *freq_table,
 107                         unsigned long rate);
 108
 109 long clk_rate_div_range_round(struct clk *clk, unsigned int div_min,
 110                               unsigned int div_max, unsigned long rate);
 111
 112 long clk_rate_mult_range_round(struct clk *clk, unsigned int mult_min,
 113                                unsigned int mult_max, unsigned long rate);
 114
 115 long clk_round_parent(struct clk *clk, unsigned long target,
 116                       unsigned long *best_freq, unsigned long *parent_freq,
 117                       unsigned int div_min, unsigned int div_max);
 118
 119 #define SH_CLK_MSTP(_parent, _enable_reg, _enable_bit, _flags)          \
 120 {                                                                       \
 121         .parent         = _parent,                                      \
 122         .enable_reg     = (void __iomem *)_enable_reg,                  \
 123         .enable_bit     = _enable_bit,                                  \
 124         .flags          = _flags,                                       \
 125 }
 126
 127 #define SH_CLK_MSTP32(_p, _r, _b, _f)                                   \
 128         SH_CLK_MSTP(_p, _r, _b, _f | CLK_ENABLE_REG_32BIT)
 129
 130 #define SH_CLK_MSTP16(_p, _r, _b, _f)                                   \
 131         SH_CLK_MSTP(_p, _r, _b, _f | CLK_ENABLE_REG_16BIT)
 132
 133 #define SH_CLK_MSTP8(_p, _r, _b, _f)                                    \
 134         SH_CLK_MSTP(_p, _r, _b, _f | CLK_ENABLE_REG_8BIT)
 135
 136 int sh_clk_mstp_register(struct clk *clks, int nr);
 137
 138 /*
 139  * MSTP registration never really cared about access size, despite the
 140  * original enable/disable pairs assuming a 32-bit access. Clocks are
 141  * responsible for defining their access sizes either directly or via the
 142  * clock definition wrappers.
 143  */
 144 static inline int __deprecated sh_clk_mstp32_register(struct clk *clks, int nr)
 145 {
 146         return sh_clk_mstp_register(clks, nr);
 147 }
 148
 149 #define SH_CLK_DIV4(_parent, _reg, _shift, _div_bitmap, _flags) \
 150 {                                                               \
 151         .parent = _parent,                                      \
 152         .enable_reg = (void __iomem *)_reg,                     \
 153         .enable_bit = _shift,                                   \
 154         .arch_flags = _div_bitmap,                              \
 155         .div_mask = SH_CLK_DIV4_MSK,                            \
 156         .flags = _flags,                                        \
 157 }
 158
 159 struct clk_div_table {
 160         struct clk_div_mult_table *div_mult_table;
 161         void (*kick)(struct clk *clk);
 162 };
 163
 164 #define clk_div4_table clk_div_table
 165
 166 int sh_clk_div4_register(struct clk *clks, int nr,
 167                          struct clk_div4_table *table);
 168 int sh_clk_div4_enable_register(struct clk *clks, int nr,
 169                          struct clk_div4_table *table);
 170 int sh_clk_div4_reparent_register(struct clk *clks, int nr,
 171                          struct clk_div4_table *table);
 172
 173 #define SH_CLK_DIV6_EXT(_reg, _flags, _parents,                 \
 174                         _num_parents, _src_shift, _src_width)   \
 175 {                                                               \
 176         .enable_reg = (void __iomem *)_reg,                     \
 177         .enable_bit = 0, /* unused */                           \
 178         .flags = _flags | CLK_MASK_DIV_ON_DISABLE,              \
 179         .div_mask = SH_CLK_DIV6_MSK,                            \
 180         .parent_table = _parents,                               \
 181         .parent_num = _num_parents,                             \
 182         .src_shift = _src_shift,                                \
 183         .src_width = _src_width,                                \
 184 }
 185
 186 #define SH_CLK_DIV6(_parent, _reg, _flags)                      \
 187 {                                                               \
 188         .parent         = _parent,                              \
 189         .enable_reg     = (void __iomem *)_reg,                 \
 190         .enable_bit     = 0,    /* unused */                    \
 191         .div_mask       = SH_CLK_DIV6_MSK,                      \
 192         .flags          = _flags | CLK_MASK_DIV_ON_DISABLE,     \
 193 }
 194
 195 int sh_clk_div6_register(struct clk *clks, int nr);
 196 int sh_clk_div6_reparent_register(struct clk *clks, int nr);
 197
 198 #define CLKDEV_CON_ID(_id, _clk) { .con_id = _id, .clk = _clk }
 199 #define CLKDEV_DEV_ID(_id, _clk) { .dev_id = _id, .clk = _clk }
 200 #define CLKDEV_ICK_ID(_cid, _did, _clk) { .con_id = _cid, .dev_id = _did, .clk = _clk }
 201
 202 #endif /* __SH_CLOCK_H */