309 lines
11 KiB
C
309 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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*
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* This driver supports the following PXA CPU/SSP ports:-
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*
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* PXA250 SSP
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* PXA255 SSP, NSSP
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* PXA26x SSP, NSSP, ASSP
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* PXA27x SSP1, SSP2, SSP3
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* PXA3xx SSP1, SSP2, SSP3, SSP4
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*/
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#ifndef __LINUX_PXA2XX_SSP_H
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#define __LINUX_PXA2XX_SSP_H
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#include <linux/bits.h>
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#include <linux/compiler_types.h>
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#include <linux/io.h>
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#include <linux/kconfig.h>
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#include <linux/list.h>
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#include <linux/types.h>
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struct clk;
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struct device;
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struct device_node;
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/*
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* SSP Serial Port Registers
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* PXA250, PXA255, PXA26x and PXA27x SSP controllers are all slightly different.
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* PXA255, PXA26x and PXA27x have extra ports, registers and bits.
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*/
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#define SSCR0 (0x00) /* SSP Control Register 0 */
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#define SSCR1 (0x04) /* SSP Control Register 1 */
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#define SSSR (0x08) /* SSP Status Register */
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#define SSITR (0x0C) /* SSP Interrupt Test Register */
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#define SSDR (0x10) /* SSP Data Write/Data Read Register */
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#define SSTO (0x28) /* SSP Time Out Register */
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#define SSPSP (0x2C) /* SSP Programmable Serial Protocol */
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#define SSTSA (0x30) /* SSP Tx Timeslot Active */
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#define SSRSA (0x34) /* SSP Rx Timeslot Active */
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#define SSTSS (0x38) /* SSP Timeslot Status */
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#define SSACD (0x3C) /* SSP Audio Clock Divider */
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#define SSACDD (0x40) /* SSP Audio Clock Dither Divider */
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/* Common PXA2xx bits first */
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#define SSCR0_DSS GENMASK(3, 0) /* Data Size Select (mask) */
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#define SSCR0_DataSize(x) ((x) - 1) /* Data Size Select [4..16] */
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#define SSCR0_FRF GENMASK(5, 4) /* FRame Format (mask) */
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#define SSCR0_Motorola (0x0 << 4) /* Motorola's Serial Peripheral Interface (SPI) */
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#define SSCR0_TI (0x1 << 4) /* Texas Instruments' Synchronous Serial Protocol (SSP) */
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#define SSCR0_National (0x2 << 4) /* National Microwire */
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#define SSCR0_ECS BIT(6) /* External clock select */
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#define SSCR0_SSE BIT(7) /* Synchronous Serial Port Enable */
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#define SSCR0_SCR(x) ((x) << 8) /* Serial Clock Rate (mask) */
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/* PXA27x, PXA3xx */
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#define SSCR0_EDSS BIT(20) /* Extended data size select */
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#define SSCR0_NCS BIT(21) /* Network clock select */
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#define SSCR0_RIM BIT(22) /* Receive FIFO overrun interrupt mask */
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#define SSCR0_TUM BIT(23) /* Transmit FIFO underrun interrupt mask */
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#define SSCR0_FRDC GENMASK(26, 24) /* Frame rate divider control (mask) */
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#define SSCR0_SlotsPerFrm(x) (((x) - 1) << 24) /* Time slots per frame [1..8] */
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#define SSCR0_FPCKE BIT(29) /* FIFO packing enable */
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#define SSCR0_ACS BIT(30) /* Audio clock select */
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#define SSCR0_MOD BIT(31) /* Mode (normal or network) */
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#define SSCR1_RIE BIT(0) /* Receive FIFO Interrupt Enable */
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#define SSCR1_TIE BIT(1) /* Transmit FIFO Interrupt Enable */
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#define SSCR1_LBM BIT(2) /* Loop-Back Mode */
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#define SSCR1_SPO BIT(3) /* Motorola SPI SSPSCLK polarity setting */
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#define SSCR1_SPH BIT(4) /* Motorola SPI SSPSCLK phase setting */
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#define SSCR1_MWDS BIT(5) /* Microwire Transmit Data Size */
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#define SSSR_ALT_FRM_MASK GENMASK(1, 0) /* Masks the SFRM signal number */
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#define SSSR_TNF BIT(2) /* Transmit FIFO Not Full */
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#define SSSR_RNE BIT(3) /* Receive FIFO Not Empty */
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#define SSSR_BSY BIT(4) /* SSP Busy */
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#define SSSR_TFS BIT(5) /* Transmit FIFO Service Request */
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#define SSSR_RFS BIT(6) /* Receive FIFO Service Request */
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#define SSSR_ROR BIT(7) /* Receive FIFO Overrun */
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#define RX_THRESH_DFLT 8
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#define TX_THRESH_DFLT 8
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#define SSSR_TFL_MASK GENMASK(11, 8) /* Transmit FIFO Level mask */
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#define SSSR_RFL_MASK GENMASK(15, 12) /* Receive FIFO Level mask */
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#define SSCR1_TFT GENMASK(9, 6) /* Transmit FIFO Threshold (mask) */
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#define SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..16] */
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#define SSCR1_RFT GENMASK(13, 10) /* Receive FIFO Threshold (mask) */
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#define SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..16] */
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#define RX_THRESH_CE4100_DFLT 2
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#define TX_THRESH_CE4100_DFLT 2
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#define CE4100_SSSR_TFL_MASK GENMASK(9, 8) /* Transmit FIFO Level mask */
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#define CE4100_SSSR_RFL_MASK GENMASK(13, 12) /* Receive FIFO Level mask */
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#define CE4100_SSCR1_TFT GENMASK(7, 6) /* Transmit FIFO Threshold (mask) */
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#define CE4100_SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..4] */
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#define CE4100_SSCR1_RFT GENMASK(11, 10) /* Receive FIFO Threshold (mask) */
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#define CE4100_SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..4] */
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/* Intel Quark X1000 */
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#define DDS_RATE 0x28 /* SSP DDS Clock Rate Register */
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/* QUARK_X1000 SSCR0 bit definition */
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#define QUARK_X1000_SSCR0_DSS GENMASK(4, 0) /* Data Size Select (mask) */
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#define QUARK_X1000_SSCR0_DataSize(x) ((x) - 1) /* Data Size Select [4..32] */
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#define QUARK_X1000_SSCR0_FRF GENMASK(6, 5) /* FRame Format (mask) */
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#define QUARK_X1000_SSCR0_Motorola (0x0 << 5) /* Motorola's Serial Peripheral Interface (SPI) */
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#define RX_THRESH_QUARK_X1000_DFLT 1
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#define TX_THRESH_QUARK_X1000_DFLT 16
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#define QUARK_X1000_SSSR_TFL_MASK GENMASK(12, 8) /* Transmit FIFO Level mask */
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#define QUARK_X1000_SSSR_RFL_MASK GENMASK(17, 13) /* Receive FIFO Level mask */
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#define QUARK_X1000_SSCR1_TFT GENMASK(10, 6) /* Transmit FIFO Threshold (mask) */
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#define QUARK_X1000_SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..32] */
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#define QUARK_X1000_SSCR1_RFT GENMASK(15, 11) /* Receive FIFO Threshold (mask) */
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#define QUARK_X1000_SSCR1_RxTresh(x) (((x) - 1) << 11) /* level [1..32] */
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#define QUARK_X1000_SSCR1_EFWR BIT(16) /* Enable FIFO Write/Read */
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#define QUARK_X1000_SSCR1_STRF BIT(17) /* Select FIFO or EFWR */
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/* Extra bits in PXA255, PXA26x and PXA27x SSP ports */
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#define SSCR0_TISSP (1 << 4) /* TI Sync Serial Protocol */
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#define SSCR0_PSP (3 << 4) /* PSP - Programmable Serial Protocol */
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#define SSCR1_EFWR BIT(14) /* Enable FIFO Write/Read */
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#define SSCR1_STRF BIT(15) /* Select FIFO or EFWR */
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#define SSCR1_IFS BIT(16) /* Invert Frame Signal */
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#define SSCR1_PINTE BIT(18) /* Peripheral Trailing Byte Interrupt Enable */
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#define SSCR1_TINTE BIT(19) /* Receiver Time-out Interrupt enable */
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#define SSCR1_RSRE BIT(20) /* Receive Service Request Enable */
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#define SSCR1_TSRE BIT(21) /* Transmit Service Request Enable */
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#define SSCR1_TRAIL BIT(22) /* Trailing Byte */
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#define SSCR1_RWOT BIT(23) /* Receive Without Transmit */
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#define SSCR1_SFRMDIR BIT(24) /* Frame Direction */
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#define SSCR1_SCLKDIR BIT(25) /* Serial Bit Rate Clock Direction */
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#define SSCR1_ECRB BIT(26) /* Enable Clock request B */
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#define SSCR1_ECRA BIT(27) /* Enable Clock Request A */
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#define SSCR1_SCFR BIT(28) /* Slave Clock free Running */
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#define SSCR1_EBCEI BIT(29) /* Enable Bit Count Error interrupt */
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#define SSCR1_TTE BIT(30) /* TXD Tristate Enable */
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#define SSCR1_TTELP BIT(31) /* TXD Tristate Enable Last Phase */
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#define SSSR_PINT BIT(18) /* Peripheral Trailing Byte Interrupt */
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#define SSSR_TINT BIT(19) /* Receiver Time-out Interrupt */
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#define SSSR_EOC BIT(20) /* End Of Chain */
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#define SSSR_TUR BIT(21) /* Transmit FIFO Under Run */
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#define SSSR_CSS BIT(22) /* Clock Synchronisation Status */
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#define SSSR_BCE BIT(23) /* Bit Count Error */
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#define SSPSP_SCMODE(x) ((x) << 0) /* Serial Bit Rate Clock Mode */
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#define SSPSP_SFRMP BIT(2) /* Serial Frame Polarity */
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#define SSPSP_ETDS BIT(3) /* End of Transfer data State */
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#define SSPSP_STRTDLY(x) ((x) << 4) /* Start Delay */
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#define SSPSP_DMYSTRT(x) ((x) << 7) /* Dummy Start */
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#define SSPSP_SFRMDLY(x) ((x) << 9) /* Serial Frame Delay */
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#define SSPSP_SFRMWDTH(x) ((x) << 16) /* Serial Frame Width */
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#define SSPSP_DMYSTOP(x) ((x) << 23) /* Dummy Stop */
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#define SSPSP_FSRT BIT(25) /* Frame Sync Relative Timing */
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/* PXA3xx */
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#define SSPSP_EDMYSTRT(x) ((x) << 26) /* Extended Dummy Start */
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#define SSPSP_EDMYSTOP(x) ((x) << 28) /* Extended Dummy Stop */
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#define SSPSP_TIMING_MASK (0x7f8001f0)
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#define SSACD_ACDS(x) ((x) << 0) /* Audio clock divider select */
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#define SSACD_ACDS_1 (0)
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#define SSACD_ACDS_2 (1)
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#define SSACD_ACDS_4 (2)
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#define SSACD_ACDS_8 (3)
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#define SSACD_ACDS_16 (4)
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#define SSACD_ACDS_32 (5)
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#define SSACD_SCDB BIT(3) /* SSPSYSCLK Divider Bypass */
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#define SSACD_SCDB_4X (0)
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#define SSACD_SCDB_1X (1)
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#define SSACD_ACPS(x) ((x) << 4) /* Audio clock PLL select */
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#define SSACD_SCDX8 BIT(7) /* SYSCLK division ratio select */
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/* Intel Merrifield SSP */
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#define SFIFOL 0x68 /* FIFO level */
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#define SFIFOTT 0x6c /* FIFO trigger threshold */
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#define RX_THRESH_MRFLD_DFLT 16
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#define TX_THRESH_MRFLD_DFLT 16
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#define SFIFOL_TFL_MASK GENMASK(15, 0) /* Transmit FIFO Level mask */
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#define SFIFOL_RFL_MASK GENMASK(31, 16) /* Receive FIFO Level mask */
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#define SFIFOTT_TFT GENMASK(15, 0) /* Transmit FIFO Threshold (mask) */
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#define SFIFOTT_TxThresh(x) (((x) - 1) << 0) /* TX FIFO trigger threshold / level */
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#define SFIFOTT_RFT GENMASK(31, 16) /* Receive FIFO Threshold (mask) */
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#define SFIFOTT_RxThresh(x) (((x) - 1) << 16) /* RX FIFO trigger threshold / level */
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/* LPSS SSP */
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#define SSITF 0x44 /* TX FIFO trigger level */
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#define SSITF_TxHiThresh(x) (((x) - 1) << 0)
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#define SSITF_TxLoThresh(x) (((x) - 1) << 8)
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#define SSIRF 0x48 /* RX FIFO trigger level */
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#define SSIRF_RxThresh(x) ((x) - 1)
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/* LPT/WPT SSP */
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#define SSCR2 (0x40) /* SSP Command / Status 2 */
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#define SSPSP2 (0x44) /* SSP Programmable Serial Protocol 2 */
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enum pxa_ssp_type {
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SSP_UNDEFINED = 0,
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PXA25x_SSP, /* pxa 210, 250, 255, 26x */
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PXA25x_NSSP, /* pxa 255, 26x (including ASSP) */
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PXA27x_SSP,
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PXA3xx_SSP,
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PXA168_SSP,
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MMP2_SSP,
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PXA910_SSP,
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CE4100_SSP,
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MRFLD_SSP,
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QUARK_X1000_SSP,
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/* Keep LPSS types sorted with lpss_platforms[] */
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LPSS_LPT_SSP,
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LPSS_BYT_SSP,
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LPSS_BSW_SSP,
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LPSS_SPT_SSP,
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LPSS_BXT_SSP,
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LPSS_CNL_SSP,
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};
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struct ssp_device {
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struct device *dev;
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struct list_head node;
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struct clk *clk;
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void __iomem *mmio_base;
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unsigned long phys_base;
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const char *label;
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int port_id;
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enum pxa_ssp_type type;
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int use_count;
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int irq;
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struct device_node *of_node;
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};
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/**
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* pxa_ssp_write_reg - Write to a SSP register
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*
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* @dev: SSP device to access
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* @reg: Register to write to
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* @val: Value to be written.
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*/
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static inline void pxa_ssp_write_reg(struct ssp_device *dev, u32 reg, u32 val)
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{
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__raw_writel(val, dev->mmio_base + reg);
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}
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/**
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* pxa_ssp_read_reg - Read from a SSP register
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*
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* @dev: SSP device to access
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* @reg: Register to read from
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*/
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static inline u32 pxa_ssp_read_reg(struct ssp_device *dev, u32 reg)
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{
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return __raw_readl(dev->mmio_base + reg);
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}
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static inline void pxa_ssp_enable(struct ssp_device *ssp)
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{
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u32 sscr0;
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sscr0 = pxa_ssp_read_reg(ssp, SSCR0) | SSCR0_SSE;
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pxa_ssp_write_reg(ssp, SSCR0, sscr0);
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}
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static inline void pxa_ssp_disable(struct ssp_device *ssp)
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{
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u32 sscr0;
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sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & ~SSCR0_SSE;
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pxa_ssp_write_reg(ssp, SSCR0, sscr0);
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}
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#if IS_ENABLED(CONFIG_PXA_SSP)
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struct ssp_device *pxa_ssp_request(int port, const char *label);
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void pxa_ssp_free(struct ssp_device *);
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struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node,
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const char *label);
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#else
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static inline struct ssp_device *pxa_ssp_request(int port, const char *label)
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{
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return NULL;
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}
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static inline struct ssp_device *pxa_ssp_request_of(const struct device_node *n,
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const char *name)
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{
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return NULL;
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}
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static inline void pxa_ssp_free(struct ssp_device *ssp) {}
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#endif
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#endif /* __LINUX_PXA2XX_SSP_H */
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