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1/* SPDX-License-Identifier: GPL-2.0-only */2/* OMAP SSI internal interface.3 *4 * Copyright (C) 2010 Nokia Corporation. All rights reserved.5 * Copyright (C) 2013 Sebastian Reichel6 *7 * Contact: Carlos Chinea <carlos.chinea@nokia.com>8 */9 10#ifndef __LINUX_HSI_OMAP_SSI_H__11#define __LINUX_HSI_OMAP_SSI_H__12 13#include <linux/device.h>14#include <linux/module.h>15#include <linux/platform_device.h>16#include <linux/hsi/hsi.h>17#include <linux/gpio/consumer.h>18#include <linux/interrupt.h>19#include <linux/io.h>20 21#define SSI_MAX_CHANNELS 822#define SSI_MAX_GDD_LCH 823#define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)24 25#define SSI_WAKE_EN 026 27/**28 * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context29 * @mode: Bit transmission mode30 * @channels: Number of channels31 * @framesize: Frame size in bits32 * @timeout: RX frame timeout33 * @divisor: TX divider34 * @arb_mode: Arbitration mode for TX frame (Round robin, priority)35 */36struct omap_ssm_ctx {37 u32 mode;38 u32 channels;39 u32 frame_size;40 union {41 u32 timeout; /* Rx Only */42 struct {43 u32 arb_mode;44 u32 divisor;45 }; /* Tx only */46 };47};48 49/**50 * struct omap_ssi_port - OMAP SSI port data51 * @dev: device associated to the port (HSI port)52 * @pdev: platform device associated to the port53 * @sst_dma: SSI transmitter physical base address54 * @ssr_dma: SSI receiver physical base address55 * @sst_base: SSI transmitter base address56 * @ssr_base: SSI receiver base address57 * @wk_lock: spin lock to serialize access to the wake lines58 * @lock: Spin lock to serialize access to the SSI port59 * @channels: Current number of channels configured (1,2,4 or 8)60 * @txqueue: TX message queues61 * @rxqueue: RX message queues62 * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)63 * @errqueue: Queue for failed messages64 * @errqueue_work: Delayed Work for failed messages65 * @irq: IRQ number66 * @wake_irq: IRQ number for incoming wake line (-1 if none)67 * @wake_gpio: GPIO number for incoming wake line (-1 if none)68 * @flags: flags to keep track of states69 * @wk_refcount: Reference count for output wake line70 * @work: worker for starting TX71 * @sys_mpu_enable: Context for the interrupt enable register for irq 072 * @sst: Context for the synchronous serial transmitter73 * @ssr: Context for the synchronous serial receiver74 */75struct omap_ssi_port {76 struct device *dev;77 struct device *pdev;78 dma_addr_t sst_dma;79 dma_addr_t ssr_dma;80 void __iomem *sst_base;81 void __iomem *ssr_base;82 spinlock_t wk_lock;83 spinlock_t lock;84 unsigned int channels;85 struct list_head txqueue[SSI_MAX_CHANNELS];86 struct list_head rxqueue[SSI_MAX_CHANNELS];87 struct list_head brkqueue;88 struct list_head errqueue;89 struct delayed_work errqueue_work;90 unsigned int irq;91 int wake_irq;92 struct gpio_desc *wake_gpio;93 bool wktest:1; /* FIXME: HACK to be removed */94 unsigned long flags;95 unsigned int wk_refcount;96 struct work_struct work;97 /* OMAP SSI port context */98 u32 sys_mpu_enable; /* We use only one irq */99 struct omap_ssm_ctx sst;100 struct omap_ssm_ctx ssr;101 u32 loss_count;102 u32 port_id;103#ifdef CONFIG_DEBUG_FS104 struct dentry *dir;105#endif106};107 108/**109 * struct gdd_trn - GDD transaction data110 * @msg: Pointer to the HSI message being served111 * @sg: Pointer to the current sg entry being served112 */113struct gdd_trn {114 struct hsi_msg *msg;115 struct scatterlist *sg;116};117 118/**119 * struct omap_ssi_controller - OMAP SSI controller data120 * @dev: device associated to the controller (HSI controller)121 * @sys: SSI I/O base address122 * @gdd: GDD I/O base address123 * @fck: SSI functional clock124 * @gdd_irq: IRQ line for GDD125 * @gdd_tasklet: bottom half for DMA transfers126 * @gdd_trn: Array of GDD transaction data for ongoing GDD transfers127 * @lock: lock to serialize access to GDD128 * @fck_nb: DVFS notfifier block129 * @fck_rate: clock rate130 * @loss_count: To follow if we need to restore context or not131 * @max_speed: Maximum TX speed (Kb/s) set by the clients.132 * @gdd_gcr: SSI GDD saved context133 * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any134 * @port: Array of pointers of the ports of the controller135 * @dir: Debugfs SSI root directory136 */137struct omap_ssi_controller {138 struct device *dev;139 void __iomem *sys;140 void __iomem *gdd;141 struct clk *fck;142 unsigned int gdd_irq;143 struct tasklet_struct gdd_tasklet;144 struct gdd_trn gdd_trn[SSI_MAX_GDD_LCH];145 spinlock_t lock;146 struct notifier_block fck_nb;147 unsigned long fck_rate;148 u32 loss_count;149 u32 max_speed;150 /* OMAP SSI Controller context */151 u32 gdd_gcr;152 int (*get_loss)(struct device *dev);153 struct omap_ssi_port **port;154#ifdef CONFIG_DEBUG_FS155 struct dentry *dir;156#endif157};158 159void omap_ssi_port_update_fclk(struct hsi_controller *ssi,160 struct omap_ssi_port *omap_port);161 162extern struct platform_driver ssi_port_pdriver;163 164#endif /* __LINUX_HSI_OMAP_SSI_H__ */165