/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * STM32 ALSA SoC Digital Audio Interface (SAI) driver.
 *
 * Copyright (C) 2016, STMicroelectronics - All Rights Reserved
 * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics.
 */

#include <linux/bitfield.h>

/******************** SAI Register Map **************************************/

/* Global configuration register */
#define STM_SAI_GCR             0x00

/* Sub-block A&B registers offsets, relative to A&B sub-block addresses */
#define STM_SAI_CR1_REGX        0x00    /* A offset: 0x04. B offset: 0x24 */
#define STM_SAI_CR2_REGX        0x04
#define STM_SAI_FRCR_REGX       0x08
#define STM_SAI_SLOTR_REGX      0x0C
#define STM_SAI_IMR_REGX        0x10
#define STM_SAI_SR_REGX         0x14
#define STM_SAI_CLRFR_REGX      0x18
#define STM_SAI_DR_REGX         0x1C

/* Sub-block A registers, relative to sub-block A address */
#define STM_SAI_PDMCR_REGX      0x40
#define STM_SAI_PDMLY_REGX      0x44

/* Hardware configuration registers */
#define STM_SAI_HWCFGR          0x3F0
#define STM_SAI_VERR            0x3F4
#define STM_SAI_IDR             0x3F8
#define STM_SAI_SIDR            0x3FC

/******************** Bit definition for SAI_GCR register *******************/
#define SAI_GCR_SYNCIN_SHIFT    0
#define SAI_GCR_SYNCIN_WDTH     2
#define SAI_GCR_SYNCIN_MASK     GENMASK(1, SAI_GCR_SYNCIN_SHIFT)
#define SAI_GCR_SYNCIN_MAX      FIELD_GET(SAI_GCR_SYNCIN_MASK,\
                                SAI_GCR_SYNCIN_MASK)

#define SAI_GCR_SYNCOUT_SHIFT   4
#define SAI_GCR_SYNCOUT_MASK    GENMASK(5, SAI_GCR_SYNCOUT_SHIFT)

/******************* Bit definition for SAI_XCR1 register *******************/
#define SAI_XCR1_RX_TX_SHIFT    0
#define SAI_XCR1_RX_TX          BIT(SAI_XCR1_RX_TX_SHIFT)
#define SAI_XCR1_SLAVE_SHIFT    1
#define SAI_XCR1_SLAVE          BIT(SAI_XCR1_SLAVE_SHIFT)

#define SAI_XCR1_PRTCFG_SHIFT   2
#define SAI_XCR1_PRTCFG_MASK    GENMASK(3, SAI_XCR1_PRTCFG_SHIFT)
#define SAI_XCR1_PRTCFG_SET(x)  ((x) << SAI_XCR1_PRTCFG_SHIFT)

#define SAI_XCR1_DS_SHIFT       5
#define SAI_XCR1_DS_MASK        GENMASK(7, SAI_XCR1_DS_SHIFT)
#define SAI_XCR1_DS_SET(x)      ((x) << SAI_XCR1_DS_SHIFT)

#define SAI_XCR1_LSBFIRST_SHIFT 8
#define SAI_XCR1_LSBFIRST       BIT(SAI_XCR1_LSBFIRST_SHIFT)
#define SAI_XCR1_CKSTR_SHIFT    9
#define SAI_XCR1_CKSTR          BIT(SAI_XCR1_CKSTR_SHIFT)

#define SAI_XCR1_SYNCEN_SHIFT   10
#define SAI_XCR1_SYNCEN_MASK    GENMASK(11, SAI_XCR1_SYNCEN_SHIFT)
#define SAI_XCR1_SYNCEN_SET(x)  ((x) << SAI_XCR1_SYNCEN_SHIFT)

#define SAI_XCR1_MONO_SHIFT     12
#define SAI_XCR1_MONO           BIT(SAI_XCR1_MONO_SHIFT)
#define SAI_XCR1_OUTDRIV_SHIFT  13
#define SAI_XCR1_OUTDRIV        BIT(SAI_XCR1_OUTDRIV_SHIFT)
#define SAI_XCR1_SAIEN_SHIFT    16
#define SAI_XCR1_SAIEN          BIT(SAI_XCR1_SAIEN_SHIFT)
#define SAI_XCR1_DMAEN_SHIFT    17
#define SAI_XCR1_DMAEN          BIT(SAI_XCR1_DMAEN_SHIFT)
#define SAI_XCR1_NODIV_SHIFT    19
#define SAI_XCR1_NODIV          BIT(SAI_XCR1_NODIV_SHIFT)

#define SAI_XCR1_MCKDIV_SHIFT   20
#define SAI_XCR1_MCKDIV_WIDTH(x)        (((x) == STM_SAI_STM32F4) ? 4 : 6)
#define SAI_XCR1_MCKDIV_MASK(x) GENMASK((SAI_XCR1_MCKDIV_SHIFT + (x) - 1),\
                                SAI_XCR1_MCKDIV_SHIFT)
#define SAI_XCR1_MCKDIV_SET(x)  ((x) << SAI_XCR1_MCKDIV_SHIFT)
#define SAI_XCR1_MCKDIV_MAX(x)  ((1 << SAI_XCR1_MCKDIV_WIDTH(x)) - 1)

#define SAI_XCR1_OSR_SHIFT      26
#define SAI_XCR1_OSR            BIT(SAI_XCR1_OSR_SHIFT)

#define SAI_XCR1_MCKEN_SHIFT    27
#define SAI_XCR1_MCKEN          BIT(SAI_XCR1_MCKEN_SHIFT)

/******************* Bit definition for SAI_XCR2 register *******************/
#define SAI_XCR2_FTH_SHIFT      0
#define SAI_XCR2_FTH_MASK       GENMASK(2, SAI_XCR2_FTH_SHIFT)
#define SAI_XCR2_FTH_SET(x)     ((x) << SAI_XCR2_FTH_SHIFT)

#define SAI_XCR2_FFLUSH_SHIFT   3
#define SAI_XCR2_FFLUSH         BIT(SAI_XCR2_FFLUSH_SHIFT)
#define SAI_XCR2_TRIS_SHIFT     4
#define SAI_XCR2_TRIS           BIT(SAI_XCR2_TRIS_SHIFT)
#define SAI_XCR2_MUTE_SHIFT     5
#define SAI_XCR2_MUTE           BIT(SAI_XCR2_MUTE_SHIFT)
#define SAI_XCR2_MUTEVAL_SHIFT  6
#define SAI_XCR2_MUTEVAL        BIT(SAI_XCR2_MUTEVAL_SHIFT)

#define SAI_XCR2_MUTECNT_SHIFT  7
#define SAI_XCR2_MUTECNT_MASK   GENMASK(12, SAI_XCR2_MUTECNT_SHIFT)
#define SAI_XCR2_MUTECNT_SET(x) ((x) << SAI_XCR2_MUTECNT_SHIFT)

#define SAI_XCR2_CPL_SHIFT      13
#define SAI_XCR2_CPL            BIT(SAI_XCR2_CPL_SHIFT)

#define SAI_XCR2_COMP_SHIFT     14
#define SAI_XCR2_COMP_MASK      GENMASK(15, SAI_XCR2_COMP_SHIFT)
#define SAI_XCR2_COMP_SET(x)    ((x) << SAI_XCR2_COMP_SHIFT)

/****************** Bit definition for SAI_XFRCR register *******************/
#define SAI_XFRCR_FRL_SHIFT     0
#define SAI_XFRCR_FRL_MASK      GENMASK(7, SAI_XFRCR_FRL_SHIFT)
#define SAI_XFRCR_FRL_SET(x)    ((x) << SAI_XFRCR_FRL_SHIFT)

#define SAI_XFRCR_FSALL_SHIFT   8
#define SAI_XFRCR_FSALL_MASK    GENMASK(14, SAI_XFRCR_FSALL_SHIFT)
#define SAI_XFRCR_FSALL_SET(x)  ((x) << SAI_XFRCR_FSALL_SHIFT)

#define SAI_XFRCR_FSDEF_SHIFT   16
#define SAI_XFRCR_FSDEF         BIT(SAI_XFRCR_FSDEF_SHIFT)
#define SAI_XFRCR_FSPOL_SHIFT   17
#define SAI_XFRCR_FSPOL         BIT(SAI_XFRCR_FSPOL_SHIFT)
#define SAI_XFRCR_FSOFF_SHIFT   18
#define SAI_XFRCR_FSOFF         BIT(SAI_XFRCR_FSOFF_SHIFT)

/****************** Bit definition for SAI_XSLOTR register ******************/
#define SAI_XSLOTR_FBOFF_SHIFT  0
#define SAI_XSLOTR_FBOFF_MASK   GENMASK(4, SAI_XSLOTR_FBOFF_SHIFT)
#define SAI_XSLOTR_FBOFF_SET(x) ((x) << SAI_XSLOTR_FBOFF_SHIFT)

#define SAI_XSLOTR_SLOTSZ_SHIFT 6
#define SAI_XSLOTR_SLOTSZ_MASK  GENMASK(7, SAI_XSLOTR_SLOTSZ_SHIFT)
#define SAI_XSLOTR_SLOTSZ_SET(x)        ((x) << SAI_XSLOTR_SLOTSZ_SHIFT)

#define SAI_XSLOTR_NBSLOT_SHIFT 8
#define SAI_XSLOTR_NBSLOT_MASK  GENMASK(11, SAI_XSLOTR_NBSLOT_SHIFT)
#define SAI_XSLOTR_NBSLOT_SET(x) ((x) << SAI_XSLOTR_NBSLOT_SHIFT)

#define SAI_XSLOTR_SLOTEN_SHIFT 16
#define SAI_XSLOTR_SLOTEN_WIDTH 16
#define SAI_XSLOTR_SLOTEN_MASK  GENMASK(31, SAI_XSLOTR_SLOTEN_SHIFT)
#define SAI_XSLOTR_SLOTEN_SET(x) ((x) << SAI_XSLOTR_SLOTEN_SHIFT)

/******************* Bit definition for SAI_XIMR register *******************/
#define SAI_XIMR_OVRUDRIE       BIT(0)
#define SAI_XIMR_MUTEDETIE      BIT(1)
#define SAI_XIMR_WCKCFGIE       BIT(2)
#define SAI_XIMR_FREQIE         BIT(3)
#define SAI_XIMR_CNRDYIE        BIT(4)
#define SAI_XIMR_AFSDETIE       BIT(5)
#define SAI_XIMR_LFSDETIE       BIT(6)

#define SAI_XIMR_SHIFT  0
#define SAI_XIMR_MASK           GENMASK(6, SAI_XIMR_SHIFT)

/******************** Bit definition for SAI_XSR register *******************/
#define SAI_XSR_OVRUDR          BIT(0)
#define SAI_XSR_MUTEDET         BIT(1)
#define SAI_XSR_WCKCFG          BIT(2)
#define SAI_XSR_FREQ            BIT(3)
#define SAI_XSR_CNRDY           BIT(4)
#define SAI_XSR_AFSDET          BIT(5)
#define SAI_XSR_LFSDET          BIT(6)

#define SAI_XSR_SHIFT   0
#define SAI_XSR_MASK            GENMASK(6, SAI_XSR_SHIFT)

/****************** Bit definition for SAI_XCLRFR register ******************/
#define SAI_XCLRFR_COVRUDR      BIT(0)
#define SAI_XCLRFR_CMUTEDET     BIT(1)
#define SAI_XCLRFR_CWCKCFG      BIT(2)
#define SAI_XCLRFR_CFREQ        BIT(3)
#define SAI_XCLRFR_CCNRDY       BIT(4)
#define SAI_XCLRFR_CAFSDET      BIT(5)
#define SAI_XCLRFR_CLFSDET      BIT(6)

#define SAI_XCLRFR_SHIFT        0
#define SAI_XCLRFR_MASK         GENMASK(6, SAI_XCLRFR_SHIFT)

/****************** Bit definition for SAI_PDMCR register ******************/
#define SAI_PDMCR_PDMEN         BIT(0)

#define SAI_PDMCR_MICNBR_SHIFT  4
#define SAI_PDMCR_MICNBR_MASK   GENMASK(5, SAI_PDMCR_MICNBR_SHIFT)
#define SAI_PDMCR_MICNBR_SET(x) ((x) << SAI_PDMCR_MICNBR_SHIFT)

#define SAI_PDMCR_CKEN1         BIT(8)
#define SAI_PDMCR_CKEN2         BIT(9)
#define SAI_PDMCR_CKEN3         BIT(10)
#define SAI_PDMCR_CKEN4         BIT(11)

/****************** Bit definition for (SAI_PDMDLY register ****************/
#define SAI_PDMDLY_1L_SHIFT     0
#define SAI_PDMDLY_1L_MASK      GENMASK(2, SAI_PDMDLY_1L_SHIFT)
#define SAI_PDMDLY_1L_WIDTH     3

#define SAI_PDMDLY_1R_SHIFT     4
#define SAI_PDMDLY_1R_MASK      GENMASK(6, SAI_PDMDLY_1R_SHIFT)
#define SAI_PDMDLY_1R_WIDTH     3

#define SAI_PDMDLY_2L_SHIFT     8
#define SAI_PDMDLY_2L_MASK      GENMASK(10, SAI_PDMDLY_2L_SHIFT)
#define SAI_PDMDLY_2L_WIDTH     3

#define SAI_PDMDLY_2R_SHIFT     12
#define SAI_PDMDLY_2R_MASK      GENMASK(14, SAI_PDMDLY_2R_SHIFT)
#define SAI_PDMDLY_2R_WIDTH     3

#define SAI_PDMDLY_3L_SHIFT     16
#define SAI_PDMDLY_3L_MASK      GENMASK(18, SAI_PDMDLY_3L_SHIFT)
#define SAI_PDMDLY_3L_WIDTH     3

#define SAI_PDMDLY_3R_SHIFT     20
#define SAI_PDMDLY_3R_MASK      GENMASK(22, SAI_PDMDLY_3R_SHIFT)
#define SAI_PDMDLY_3R_WIDTH     3

#define SAI_PDMDLY_4L_SHIFT     24
#define SAI_PDMDLY_4L_MASK      GENMASK(26, SAI_PDMDLY_4L_SHIFT)
#define SAI_PDMDLY_4L_WIDTH     3

#define SAI_PDMDLY_4R_SHIFT     28
#define SAI_PDMDLY_4R_MASK      GENMASK(30, SAI_PDMDLY_4R_SHIFT)
#define SAI_PDMDLY_4R_WIDTH     3

/* Registers below apply to SAI version 2.1 and more */

/* Bit definition for SAI_HWCFGR register */
#define SAI_HWCFGR_FIFO_SIZE    GENMASK(7, 0)
#define SAI_HWCFGR_SPDIF_PDM    GENMASK(11, 8)
#define SAI_HWCFGR_REGOUT       GENMASK(19, 12)

/* Bit definition for SAI_VERR register */
#define SAI_VERR_MIN_MASK       GENMASK(3, 0)
#define SAI_VERR_MAJ_MASK       GENMASK(7, 4)

/* Bit definition for SAI_IDR register */
#define SAI_IDR_ID_MASK         GENMASK(31, 0)

/* Bit definition for SAI_SIDR register */
#define SAI_SIDR_ID_MASK        GENMASK(31, 0)

#define SAI_IPIDR_NUMBER        0x00130031

/* SAI version numbers are 1.x for F4. Major version number set to 1 for F4 */
#define STM_SAI_STM32F4         BIT(4)
/* Dummy version number for H7 socs and next */
#define STM_SAI_STM32H7         0x0

#define STM_SAI_IS_F4(ip)       ((ip)->conf.version == STM_SAI_STM32F4)
#define STM_SAI_HAS_SPDIF_PDM(ip)\
                                ((ip)->pdata->conf.has_spdif_pdm)

enum stm32_sai_syncout {
        STM_SAI_SYNC_OUT_NONE,
        STM_SAI_SYNC_OUT_A,
        STM_SAI_SYNC_OUT_B,
};

/**
 * struct stm32_sai_conf - SAI configuration
 * @version: SAI version
 * @fifo_size: SAI fifo size as words number
 * @has_spdif_pdm: SAI S/PDIF and PDM features support flag
 */
struct stm32_sai_conf {
        u32 version;
        u32 fifo_size;
        bool has_spdif_pdm;
};

/**
 * struct stm32_sai_data - private data of SAI instance driver
 * @pdev: device data pointer
 * @base: common register bank virtual base address
 * @pclk: SAI bus clock
 * @clk_x8k: SAI parent clock for sampling frequencies multiple of 8kHz
 * @clk_x11k: SAI parent clock for sampling frequencies multiple of 11kHz
 * @conf: SAI hardware capabitilites
 * @irq: SAI interrupt line
 * @set_sync: pointer to synchro mode configuration callback
 * @gcr: SAI Global Configuration Register
 */
struct stm32_sai_data {
        struct platform_device *pdev;
        void __iomem *base;
        struct clk *pclk;
        struct clk *clk_x8k;
        struct clk *clk_x11k;
        struct stm32_sai_conf conf;
        int irq;
        int (*set_sync)(struct stm32_sai_data *sai,
                        struct device_node *np_provider, int synco, int synci);
        u32 gcr;
};