1 /* 2 * TI clock drivers support 3 * 4 * Copyright (C) 2013 Texas Instruments, Inc. 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 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 11 * kind, whether express or implied; without even the implied warranty 12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 #ifndef __LINUX_CLK_TI_H__ 16 #define __LINUX_CLK_TI_H__ 17 18 #include <linux/clk-provider.h> 19 #include <linux/clkdev.h> 20 21 /** 22 * struct clk_omap_reg - OMAP register declaration 23 * @offset: offset from the master IP module base address 24 * @index: index of the master IP module 25 */ 26 struct clk_omap_reg { 27 void __iomem *ptr; 28 u16 offset; 29 u8 index; 30 u8 flags; 31 }; 32 33 /** 34 * struct dpll_data - DPLL registers and integration data 35 * @mult_div1_reg: register containing the DPLL M and N bitfields 36 * @mult_mask: mask of the DPLL M bitfield in @mult_div1_reg 37 * @div1_mask: mask of the DPLL N bitfield in @mult_div1_reg 38 * @clk_bypass: struct clk_hw pointer to the clock's bypass clock input 39 * @clk_ref: struct clk_hw pointer to the clock's reference clock input 40 * @control_reg: register containing the DPLL mode bitfield 41 * @enable_mask: mask of the DPLL mode bitfield in @control_reg 42 * @last_rounded_rate: cache of the last rate result of omap2_dpll_round_rate() 43 * @last_rounded_m: cache of the last M result of omap2_dpll_round_rate() 44 * @last_rounded_m4xen: cache of the last M4X result of 45 * omap4_dpll_regm4xen_round_rate() 46 * @last_rounded_lpmode: cache of the last lpmode result of 47 * omap4_dpll_lpmode_recalc() 48 * @max_multiplier: maximum valid non-bypass multiplier value (actual) 49 * @last_rounded_n: cache of the last N result of omap2_dpll_round_rate() 50 * @min_divider: minimum valid non-bypass divider value (actual) 51 * @max_divider: maximum valid non-bypass divider value (actual) 52 * @max_rate: maximum clock rate for the DPLL 53 * @modes: possible values of @enable_mask 54 * @autoidle_reg: register containing the DPLL autoidle mode bitfield 55 * @idlest_reg: register containing the DPLL idle status bitfield 56 * @autoidle_mask: mask of the DPLL autoidle mode bitfield in @autoidle_reg 57 * @freqsel_mask: mask of the DPLL jitter correction bitfield in @control_reg 58 * @dcc_mask: mask of the DPLL DCC correction bitfield @mult_div1_reg 59 * @dcc_rate: rate atleast which DCC @dcc_mask must be set 60 * @idlest_mask: mask of the DPLL idle status bitfield in @idlest_reg 61 * @lpmode_mask: mask of the DPLL low-power mode bitfield in @control_reg 62 * @m4xen_mask: mask of the DPLL M4X multiplier bitfield in @control_reg 63 * @auto_recal_bit: bitshift of the driftguard enable bit in @control_reg 64 * @recal_en_bit: bitshift of the PRM_IRQENABLE_* bit for recalibration IRQs 65 * @recal_st_bit: bitshift of the PRM_IRQSTATUS_* bit for recalibration IRQs 66 * @flags: DPLL type/features (see below) 67 * 68 * Possible values for @flags: 69 * DPLL_J_TYPE: "J-type DPLL" (only some 36xx, 4xxx DPLLs) 70 * 71 * @freqsel_mask is only used on the OMAP34xx family and AM35xx. 72 * 73 * XXX Some DPLLs have multiple bypass inputs, so it's not technically 74 * correct to only have one @clk_bypass pointer. 75 * 76 * XXX The runtime-variable fields (@last_rounded_rate, @last_rounded_m, 77 * @last_rounded_n) should be separated from the runtime-fixed fields 78 * and placed into a different structure, so that the runtime-fixed data 79 * can be placed into read-only space. 80 */ 81 struct dpll_data { 82 struct clk_omap_reg mult_div1_reg; 83 u32 mult_mask; 84 u32 div1_mask; 85 struct clk_hw *clk_bypass; 86 struct clk_hw *clk_ref; 87 struct clk_omap_reg control_reg; 88 u32 enable_mask; 89 unsigned long last_rounded_rate; 90 u16 last_rounded_m; 91 u8 last_rounded_m4xen; 92 u8 last_rounded_lpmode; 93 u16 max_multiplier; 94 u8 last_rounded_n; 95 u8 min_divider; 96 u16 max_divider; 97 unsigned long max_rate; 98 u8 modes; 99 struct clk_omap_reg autoidle_reg; 100 struct clk_omap_reg idlest_reg; 101 u32 autoidle_mask; 102 u32 freqsel_mask; 103 u32 idlest_mask; 104 u32 dco_mask; 105 u32 sddiv_mask; 106 u32 dcc_mask; 107 unsigned long dcc_rate; 108 u32 lpmode_mask; 109 u32 m4xen_mask; 110 u8 auto_recal_bit; 111 u8 recal_en_bit; 112 u8 recal_st_bit; 113 u8 flags; 114 }; 115 116 struct clk_hw_omap; 117 118 /** 119 * struct clk_hw_omap_ops - OMAP clk ops 120 * @find_idlest: find idlest register information for a clock 121 * @find_companion: find companion clock register information for a clock, 122 * basically converts CM_ICLKEN* <-> CM_FCLKEN* 123 * @allow_idle: enables autoidle hardware functionality for a clock 124 * @deny_idle: prevent autoidle hardware functionality for a clock 125 */ 126 struct clk_hw_omap_ops { 127 void (*find_idlest)(struct clk_hw_omap *oclk, 128 struct clk_omap_reg *idlest_reg, 129 u8 *idlest_bit, u8 *idlest_val); 130 void (*find_companion)(struct clk_hw_omap *oclk, 131 struct clk_omap_reg *other_reg, 132 u8 *other_bit); 133 void (*allow_idle)(struct clk_hw_omap *oclk); 134 void (*deny_idle)(struct clk_hw_omap *oclk); 135 }; 136 137 /** 138 * struct clk_hw_omap - OMAP struct clk 139 * @node: list_head connecting this clock into the full clock list 140 * @enable_reg: register to write to enable the clock (see @enable_bit) 141 * @enable_bit: bitshift to write to enable/disable the clock (see @enable_reg) 142 * @flags: see "struct clk.flags possibilities" above 143 * @clksel_reg: for clksel clks, register va containing src/divisor select 144 * @dpll_data: for DPLLs, pointer to struct dpll_data for this clock 145 * @clkdm_name: clockdomain name that this clock is contained in 146 * @clkdm: pointer to struct clockdomain, resolved from @clkdm_name at runtime 147 * @ops: clock ops for this clock 148 */ 149 struct clk_hw_omap { 150 struct clk_hw hw; 151 struct list_head node; 152 unsigned long fixed_rate; 153 u8 fixed_div; 154 struct clk_omap_reg enable_reg; 155 u8 enable_bit; 156 u8 flags; 157 struct clk_omap_reg clksel_reg; 158 struct dpll_data *dpll_data; 159 const char *clkdm_name; 160 struct clockdomain *clkdm; 161 const struct clk_hw_omap_ops *ops; 162 u32 context; 163 int autoidle_count; 164 }; 165 166 /* 167 * struct clk_hw_omap.flags possibilities 168 * 169 * XXX document the rest of the clock flags here 170 * 171 * ENABLE_REG_32BIT: (OMAP1 only) clock control register must be accessed 172 * with 32bit ops, by default OMAP1 uses 16bit ops. 173 * CLOCK_IDLE_CONTROL: (OMAP1 only) clock has autoidle support. 174 * CLOCK_NO_IDLE_PARENT: (OMAP1 only) when clock is enabled, its parent 175 * clock is put to no-idle mode. 176 * ENABLE_ON_INIT: Clock is enabled on init. 177 * INVERT_ENABLE: By default, clock enable bit behavior is '1' enable, '0' 178 * disable. This inverts the behavior making '0' enable and '1' disable. 179 * CLOCK_CLKOUTX2: (OMAP4 only) DPLL CLKOUT and CLKOUTX2 GATE_CTRL 180 * bits share the same register. This flag allows the 181 * omap4_dpllmx*() code to determine which GATE_CTRL bit field 182 * should be used. This is a temporary solution - a better approach 183 * would be to associate clock type-specific data with the clock, 184 * similar to the struct dpll_data approach. 185 */ 186 #define ENABLE_REG_32BIT (1 << 0) /* Use 32-bit access */ 187 #define CLOCK_IDLE_CONTROL (1 << 1) 188 #define CLOCK_NO_IDLE_PARENT (1 << 2) 189 #define ENABLE_ON_INIT (1 << 3) /* Enable upon framework init */ 190 #define INVERT_ENABLE (1 << 4) /* 0 enables, 1 disables */ 191 #define CLOCK_CLKOUTX2 (1 << 5) 192 193 /* CM_CLKEN_PLL*.EN* bit values - not all are available for every DPLL */ 194 #define DPLL_LOW_POWER_STOP 0x1 195 #define DPLL_LOW_POWER_BYPASS 0x5 196 #define DPLL_LOCKED 0x7 197 198 /* DPLL Type and DCO Selection Flags */ 199 #define DPLL_J_TYPE 0x1 200 201 /* Static memmap indices */ 202 enum { 203 TI_CLKM_CM = 0, 204 TI_CLKM_CM2, 205 TI_CLKM_PRM, 206 TI_CLKM_SCRM, 207 TI_CLKM_CTRL, 208 TI_CLKM_CTRL_AUX, 209 TI_CLKM_PLLSS, 210 CLK_MAX_MEMMAPS 211 }; 212 213 /** 214 * struct ti_clk_ll_ops - low-level ops for clocks 215 * @clk_readl: pointer to register read function 216 * @clk_writel: pointer to register write function 217 * @clk_rmw: pointer to register read-modify-write function 218 * @clkdm_clk_enable: pointer to clockdomain enable function 219 * @clkdm_clk_disable: pointer to clockdomain disable function 220 * @clkdm_lookup: pointer to clockdomain lookup function 221 * @cm_wait_module_ready: pointer to CM module wait ready function 222 * @cm_split_idlest_reg: pointer to CM module function to split idlest reg 223 * 224 * Low-level ops are generally used by the basic clock types (clk-gate, 225 * clk-mux, clk-divider etc.) to provide support for various low-level 226 * hadrware interfaces (direct MMIO, regmap etc.), and is initialized 227 * by board code. Low-level ops also contain some other platform specific 228 * operations not provided directly by clock drivers. 229 */ 230 struct ti_clk_ll_ops { 231 u32 (*clk_readl)(const struct clk_omap_reg *reg); 232 void (*clk_writel)(u32 val, const struct clk_omap_reg *reg); 233 void (*clk_rmw)(u32 val, u32 mask, const struct clk_omap_reg *reg); 234 int (*clkdm_clk_enable)(struct clockdomain *clkdm, struct clk *clk); 235 int (*clkdm_clk_disable)(struct clockdomain *clkdm, 236 struct clk *clk); 237 struct clockdomain * (*clkdm_lookup)(const char *name); 238 int (*cm_wait_module_ready)(u8 part, s16 prcm_mod, u16 idlest_reg, 239 u8 idlest_shift); 240 int (*cm_split_idlest_reg)(struct clk_omap_reg *idlest_reg, 241 s16 *prcm_inst, u8 *idlest_reg_id); 242 }; 243 244 #define to_clk_hw_omap(_hw) container_of(_hw, struct clk_hw_omap, hw) 245 246 bool omap2_clk_is_hw_omap(struct clk_hw *hw); 247 int omap2_clk_disable_autoidle_all(void); 248 int omap2_clk_enable_autoidle_all(void); 249 int omap2_clk_allow_idle(struct clk *clk); 250 int omap2_clk_deny_idle(struct clk *clk); 251 unsigned long omap2_dpllcore_recalc(struct clk_hw *hw, 252 unsigned long parent_rate); 253 int omap2_reprogram_dpllcore(struct clk_hw *clk, unsigned long rate, 254 unsigned long parent_rate); 255 void omap2xxx_clkt_dpllcore_init(struct clk_hw *hw); 256 void omap2xxx_clkt_vps_init(void); 257 unsigned long omap2_get_dpll_rate(struct clk_hw_omap *clk); 258 259 void ti_dt_clk_init_retry_clks(void); 260 void ti_dt_clockdomains_setup(void); 261 int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops); 262 263 struct regmap; 264 265 int omap2_clk_provider_init(struct device_node *parent, int index, 266 struct regmap *syscon, void __iomem *mem); 267 void omap2_clk_legacy_provider_init(int index, void __iomem *mem); 268 269 int omap3430_dt_clk_init(void); 270 int omap3630_dt_clk_init(void); 271 int am35xx_dt_clk_init(void); 272 int dm814x_dt_clk_init(void); 273 int dm816x_dt_clk_init(void); 274 int omap4xxx_dt_clk_init(void); 275 int omap5xxx_dt_clk_init(void); 276 int dra7xx_dt_clk_init(void); 277 int am33xx_dt_clk_init(void); 278 int am43xx_dt_clk_init(void); 279 int omap2420_dt_clk_init(void); 280 int omap2430_dt_clk_init(void); 281 282 struct ti_clk_features { 283 u32 flags; 284 long fint_min; 285 long fint_max; 286 long fint_band1_max; 287 long fint_band2_min; 288 u8 dpll_bypass_vals; 289 u8 cm_idlest_val; 290 }; 291 292 #define TI_CLK_DPLL_HAS_FREQSEL BIT(0) 293 #define TI_CLK_DPLL4_DENY_REPROGRAM BIT(1) 294 #define TI_CLK_DISABLE_CLKDM_CONTROL BIT(2) 295 #define TI_CLK_ERRATA_I810 BIT(3) 296 #define TI_CLK_CLKCTRL_COMPAT BIT(4) 297 #define TI_CLK_DEVICE_TYPE_GP BIT(5) 298 299 void ti_clk_setup_features(struct ti_clk_features *features); 300 const struct ti_clk_features *ti_clk_get_features(void); 301 int omap3_noncore_dpll_save_context(struct clk_hw *hw); 302 void omap3_noncore_dpll_restore_context(struct clk_hw *hw); 303 304 int omap3_core_dpll_save_context(struct clk_hw *hw); 305 void omap3_core_dpll_restore_context(struct clk_hw *hw); 306 307 extern const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll; 308 309 #ifdef CONFIG_ATAGS 310 int omap3430_clk_legacy_init(void); 311 int omap3430es1_clk_legacy_init(void); 312 int omap36xx_clk_legacy_init(void); 313 int am35xx_clk_legacy_init(void); 314 #else 315 static inline int omap3430_clk_legacy_init(void) { return -ENXIO; } 316 static inline int omap3430es1_clk_legacy_init(void) { return -ENXIO; } 317 static inline int omap36xx_clk_legacy_init(void) { return -ENXIO; } 318 static inline int am35xx_clk_legacy_init(void) { return -ENXIO; } 319 #endif 320 321 322 #endif 323