Linux Audio

Check our new training course

Loading...
v6.8
  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
  4 * Copyright (C) 2013, 2021 Intel Corporation
 
 
 
 
  5 */
  6
  7#ifndef SPI_PXA2XX_H
  8#define SPI_PXA2XX_H
  9
 10#include <linux/interrupt.h>
 
 
 11#include <linux/io.h>
 12#include <linux/types.h>
 13#include <linux/sizes.h>
 14
 15#include <linux/pxa2xx_ssp.h>
 16
 17struct gpio_desc;
 18struct pxa2xx_spi_controller;
 19struct spi_controller;
 20struct spi_device;
 21struct spi_transfer;
 22
 23struct driver_data {
 
 
 
 24	/* SSP Info */
 25	struct ssp_device *ssp;
 26
 27	/* SPI framework hookup */
 28	enum pxa_ssp_type ssp_type;
 29	struct spi_controller *controller;
 30
 31	/* PXA hookup */
 32	struct pxa2xx_spi_controller *controller_info;
 
 
 
 
 33
 34	/* SSP masks*/
 35	u32 dma_cr1;
 36	u32 int_cr1;
 37	u32 clear_sr;
 38	u32 mask_sr;
 39
 
 
 
 40	/* DMA engine support */
 
 
 
 
 
 
 
 41	atomic_t dma_running;
 42
 43	/* Current transfer state info */
 
 
 
 
 44	void *tx;
 45	void *tx_end;
 46	void *rx;
 47	void *rx_end;
 
 
 
 48	u8 n_bytes;
 49	int (*write)(struct driver_data *drv_data);
 50	int (*read)(struct driver_data *drv_data);
 51	irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
 
 52
 53	void __iomem *lpss_base;
 54
 55	/* Optional slave FIFO ready signal */
 56	struct gpio_desc *gpiod_ready;
 57};
 58
 59struct chip_data {
 60	u32 cr1;
 61	u32 dds_rate;
 62	u32 timeout;
 63	u8 enable_dma;
 64	u32 dma_burst_size;
 65	u32 dma_threshold;
 66	u32 threshold;
 
 67	u16 lpss_rx_threshold;
 68	u16 lpss_tx_threshold;
 
 
 
 
 
 
 
 
 
 69};
 70
 71static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data, u32 reg)
 
 72{
 73	return pxa_ssp_read_reg(drv_data->ssp, reg);
 74}
 75
 76static inline void pxa2xx_spi_write(const struct driver_data *drv_data, u32 reg, u32 val)
 
 77{
 78	pxa_ssp_write_reg(drv_data->ssp, reg, val);
 79}
 80
 
 
 
 
 
 
 81#define DMA_ALIGNMENT		8
 82
 83static inline int pxa25x_ssp_comp(const struct driver_data *drv_data)
 84{
 85	switch (drv_data->ssp_type) {
 86	case PXA25x_SSP:
 87	case CE4100_SSP:
 88	case QUARK_X1000_SSP:
 89		return 1;
 90	default:
 91		return 0;
 92	}
 93}
 94
 95static inline void clear_SSCR1_bits(const struct driver_data *drv_data, u32 bits)
 96{
 97	pxa2xx_spi_write(drv_data, SSCR1, pxa2xx_spi_read(drv_data, SSCR1) & ~bits);
 98}
 99
100static inline u32 read_SSSR_bits(const struct driver_data *drv_data, u32 bits)
101{
102	return pxa2xx_spi_read(drv_data, SSSR) & bits;
103}
104
105static inline void write_SSSR_CS(const struct driver_data *drv_data, u32 val)
106{
107	if (drv_data->ssp_type == CE4100_SSP ||
108	    drv_data->ssp_type == QUARK_X1000_SSP)
109		val |= read_SSSR_bits(drv_data, SSSR_ALT_FRM_MASK);
110
111	pxa2xx_spi_write(drv_data, SSSR, val);
112}
113
114extern int pxa2xx_spi_flush(struct driver_data *drv_data);
 
115
116#define MAX_DMA_LEN		SZ_64K
117#define DEFAULT_DMA_CR1		(SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
118
 
 
119extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
120extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data,
121				  struct spi_transfer *xfer);
122extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
123extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data);
124extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
125extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
126extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
127						  struct spi_device *spi,
128						  u8 bits_per_word,
129						  u32 *burst_code,
130						  u32 *threshold);
131
132#endif /* SPI_PXA2XX_H */
v4.6
 
  1/*
  2 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
  3 * Copyright (C) 2013, Intel Corporation
  4 *
  5 * This program is free software; you can redistribute it and/or modify
  6 * it under the terms of the GNU General Public License version 2 as
  7 * published by the Free Software Foundation.
  8 */
  9
 10#ifndef SPI_PXA2XX_H
 11#define SPI_PXA2XX_H
 12
 13#include <linux/atomic.h>
 14#include <linux/dmaengine.h>
 15#include <linux/errno.h>
 16#include <linux/io.h>
 17#include <linux/interrupt.h>
 18#include <linux/platform_device.h>
 
 19#include <linux/pxa2xx_ssp.h>
 20#include <linux/scatterlist.h>
 21#include <linux/sizes.h>
 22#include <linux/spi/spi.h>
 23#include <linux/spi/pxa2xx_spi.h>
 
 
 24
 25struct driver_data {
 26	/* Driver model hookup */
 27	struct platform_device *pdev;
 28
 29	/* SSP Info */
 30	struct ssp_device *ssp;
 31
 32	/* SPI framework hookup */
 33	enum pxa_ssp_type ssp_type;
 34	struct spi_master *master;
 35
 36	/* PXA hookup */
 37	struct pxa2xx_spi_master *master_info;
 38
 39	/* SSP register addresses */
 40	void __iomem *ioaddr;
 41	u32 ssdr_physical;
 42
 43	/* SSP masks*/
 44	u32 dma_cr1;
 45	u32 int_cr1;
 46	u32 clear_sr;
 47	u32 mask_sr;
 48
 49	/* Message Transfer pump */
 50	struct tasklet_struct pump_transfers;
 51
 52	/* DMA engine support */
 53	struct dma_chan *rx_chan;
 54	struct dma_chan *tx_chan;
 55	struct sg_table rx_sgt;
 56	struct sg_table tx_sgt;
 57	int rx_nents;
 58	int tx_nents;
 59	void *dummy;
 60	atomic_t dma_running;
 61
 62	/* Current message transfer state info */
 63	struct spi_message *cur_msg;
 64	struct spi_transfer *cur_transfer;
 65	struct chip_data *cur_chip;
 66	size_t len;
 67	void *tx;
 68	void *tx_end;
 69	void *rx;
 70	void *rx_end;
 71	int dma_mapped;
 72	size_t rx_map_len;
 73	size_t tx_map_len;
 74	u8 n_bytes;
 75	int (*write)(struct driver_data *drv_data);
 76	int (*read)(struct driver_data *drv_data);
 77	irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
 78	void (*cs_control)(u32 command);
 79
 80	void __iomem *lpss_base;
 
 
 
 81};
 82
 83struct chip_data {
 84	u32 cr1;
 85	u32 dds_rate;
 86	u32 timeout;
 87	u8 n_bytes;
 88	u32 dma_burst_size;
 
 89	u32 threshold;
 90	u32 dma_threshold;
 91	u16 lpss_rx_threshold;
 92	u16 lpss_tx_threshold;
 93	u8 enable_dma;
 94	union {
 95		int gpio_cs;
 96		unsigned int frm;
 97	};
 98	int gpio_cs_inverted;
 99	int (*write)(struct driver_data *drv_data);
100	int (*read)(struct driver_data *drv_data);
101	void (*cs_control)(u32 command);
102};
103
104static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data,
105				  unsigned reg)
106{
107	return __raw_readl(drv_data->ioaddr + reg);
108}
109
110static  inline void pxa2xx_spi_write(const struct driver_data *drv_data,
111				     unsigned reg, u32 val)
112{
113	__raw_writel(val, drv_data->ioaddr + reg);
114}
115
116#define START_STATE ((void *)0)
117#define RUNNING_STATE ((void *)1)
118#define DONE_STATE ((void *)2)
119#define ERROR_STATE ((void *)-1)
120
121#define IS_DMA_ALIGNED(x)	IS_ALIGNED((unsigned long)(x), DMA_ALIGNMENT)
122#define DMA_ALIGNMENT		8
123
124static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
125{
126	switch (drv_data->ssp_type) {
127	case PXA25x_SSP:
128	case CE4100_SSP:
129	case QUARK_X1000_SSP:
130		return 1;
131	default:
132		return 0;
133	}
134}
135
136static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
 
 
 
 
 
 
 
 
 
 
137{
138	if (drv_data->ssp_type == CE4100_SSP ||
139	    drv_data->ssp_type == QUARK_X1000_SSP)
140		val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK;
141
142	pxa2xx_spi_write(drv_data, SSSR, val);
143}
144
145extern int pxa2xx_spi_flush(struct driver_data *drv_data);
146extern void *pxa2xx_spi_next_transfer(struct driver_data *drv_data);
147
148#define MAX_DMA_LEN		SZ_64K
149#define DEFAULT_DMA_CR1		(SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
150
151extern bool pxa2xx_spi_dma_is_possible(size_t len);
152extern int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data);
153extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
154extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst);
 
155extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
 
156extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
157extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
158extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
159						  struct spi_device *spi,
160						  u8 bits_per_word,
161						  u32 *burst_code,
162						  u32 *threshold);
163
164#endif /* SPI_PXA2XX_H */