clk/sunxi-ng/ccu_sdm.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * Copyright (c) 2017 Chen-Yu Tsai. All rights reserved.
0004  */
0005
0006 #ifndef _CCU_SDM_H
0007 #define _CCU_SDM_H
0008
0009 #include <linux/clk-provider.h>
0010
0011 #include "ccu_common.h"
0012
0013 struct ccu_sdm_setting {
0014     unsigned long   rate;
0015
0016     /*
0017      * XXX We don't know what the step and bottom register fields
0018      * mean. Just copy the whole register value from the vendor
0019      * kernel for now.
0020      */
0021     u32     pattern;
0022
0023     /*
0024      * M and N factors here should be the values used in
0025      * calculation, not the raw values written to registers
0026      */
0027     u32     m;
0028     u32     n;
0029 };
0030
0031 struct ccu_sdm_internal {
0032     struct ccu_sdm_setting  *table;
0033     u32     table_size;
0034     /* early SoCs don't have the SDM enable bit in the PLL register */
0035     u32     enable;
0036     /* second enable bit in tuning register */
0037     u32     tuning_enable;
0038     u16     tuning_reg;
0039 };
0040
0041 #define _SUNXI_CCU_SDM(_table, _enable,         \
0042                _reg, _reg_enable)       \
0043     {                       \
0044         .table      = _table,       \
0045         .table_size = ARRAY_SIZE(_table),   \
0046         .enable     = _enable,      \
0047         .tuning_enable  = _reg_enable,      \
0048         .tuning_reg = _reg,         \
0049     }
0050
0051 bool ccu_sdm_helper_is_enabled(struct ccu_common *common,
0052                    struct ccu_sdm_internal *sdm);
0053 void ccu_sdm_helper_enable(struct ccu_common *common,
0054                struct ccu_sdm_internal *sdm,
0055                unsigned long rate);
0056 void ccu_sdm_helper_disable(struct ccu_common *common,
0057                 struct ccu_sdm_internal *sdm);
0058
0059 bool ccu_sdm_helper_has_rate(struct ccu_common *common,
0060                  struct ccu_sdm_internal *sdm,
0061                  unsigned long rate);
0062
0063 unsigned long ccu_sdm_helper_read_rate(struct ccu_common *common,
0064                        struct ccu_sdm_internal *sdm,
0065                        u32 m, u32 n);
0066
0067 int ccu_sdm_helper_get_factors(struct ccu_common *common,
0068                    struct ccu_sdm_internal *sdm,
0069                    unsigned long rate,
0070                    unsigned long *m, unsigned long *n);
0071
0072 #endif