drivers/hsi/controllers/omap_ssi.h

   1 /* OMAP SSI internal interface.
   2  *
   3  * Copyright (C) 2010 Nokia Corporation. All rights reserved.
   4  * Copyright (C) 2013 Sebastian Reichel
   5  *
   6  * Contact: Carlos Chinea <carlos.chinea@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  */
  22
  23 #ifndef __LINUX_HSI_OMAP_SSI_H__
  24 #define __LINUX_HSI_OMAP_SSI_H__
  25
  26 #include <linux/device.h>
  27 #include <linux/module.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/hsi/hsi.h>
  30 #include <linux/gpio/consumer.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/io.h>
  33
  34 #define SSI_MAX_CHANNELS        8
  35 #define SSI_MAX_GDD_LCH         8
  36 #define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
  37
  38 #define SSI_WAKE_EN 0
  39
  40 /**
  41  * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context
  42  * @mode: Bit transmission mode
  43  * @channels: Number of channels
  44  * @framesize: Frame size in bits
  45  * @timeout: RX frame timeout
  46  * @divisor: TX divider
  47  * @arb_mode: Arbitration mode for TX frame (Round robin, priority)
  48  */
  49 struct omap_ssm_ctx {
  50         u32     mode;
  51         u32     channels;
  52         u32     frame_size;
  53         union   {
  54                         u32     timeout; /* Rx Only */
  55                         struct  {
  56                                         u32     arb_mode;
  57                                         u32     divisor;
  58                         }; /* Tx only */
  59         };
  60 };
  61
  62 /**
  63  * struct omap_ssi_port - OMAP SSI port data
  64  * @dev: device associated to the port (HSI port)
  65  * @pdev: platform device associated to the port
  66  * @sst_dma: SSI transmitter physical base address
  67  * @ssr_dma: SSI receiver physical base address
  68  * @sst_base: SSI transmitter base address
  69  * @ssr_base: SSI receiver base address
  70  * @wk_lock: spin lock to serialize access to the wake lines
  71  * @lock: Spin lock to serialize access to the SSI port
  72  * @channels: Current number of channels configured (1,2,4 or 8)
  73  * @txqueue: TX message queues
  74  * @rxqueue: RX message queues
  75  * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)
  76  * @errqueue: Queue for failed messages
  77  * @errqueue_work: Delayed Work for failed messages
  78  * @irq: IRQ number
  79  * @wake_irq: IRQ number for incoming wake line (-1 if none)
  80  * @wake_gpio: GPIO number for incoming wake line (-1 if none)
  81  * @flags: flags to keep track of states
  82  * @wk_refcount: Reference count for output wake line
  83  * @work: worker for starting TX
  84  * @sys_mpu_enable: Context for the interrupt enable register for irq 0
  85  * @sst: Context for the synchronous serial transmitter
  86  * @ssr: Context for the synchronous serial receiver
  87  */
  88 struct omap_ssi_port {
  89         struct device           *dev;
  90         struct device           *pdev;
  91         dma_addr_t              sst_dma;
  92         dma_addr_t              ssr_dma;
  93         void __iomem            *sst_base;
  94         void __iomem            *ssr_base;
  95         spinlock_t              wk_lock;
  96         spinlock_t              lock;
  97         unsigned int            channels;
  98         struct list_head        txqueue[SSI_MAX_CHANNELS];
  99         struct list_head        rxqueue[SSI_MAX_CHANNELS];
 100         struct list_head        brkqueue;
 101         struct list_head        errqueue;
 102         struct delayed_work     errqueue_work;
 103         unsigned int            irq;
 104         int                     wake_irq;
 105         struct gpio_desc        *wake_gpio;
 106         bool                    wktest:1; /* FIXME: HACK to be removed */
 107         unsigned long           flags;
 108         unsigned int            wk_refcount;
 109         struct work_struct      work;
 110         /* OMAP SSI port context */
 111         u32                     sys_mpu_enable; /* We use only one irq */
 112         struct omap_ssm_ctx     sst;
 113         struct omap_ssm_ctx     ssr;
 114         u32                     loss_count;
 115         u32                     port_id;
 116 #ifdef CONFIG_DEBUG_FS
 117         struct dentry *dir;
 118 #endif
 119 };
 120
 121 /**
 122  * struct gdd_trn - GDD transaction data
 123  * @msg: Pointer to the HSI message being served
 124  * @sg: Pointer to the current sg entry being served
 125  */
 126 struct gdd_trn {
 127         struct hsi_msg          *msg;
 128         struct scatterlist      *sg;
 129 };
 130
 131 /**
 132  * struct omap_ssi_controller - OMAP SSI controller data
 133  * @dev: device associated to the controller (HSI controller)
 134  * @sys: SSI I/O base address
 135  * @gdd: GDD I/O base address
 136  * @fck: SSI functional clock
 137  * @gdd_irq: IRQ line for GDD
 138  * @gdd_tasklet: bottom half for DMA transfers
 139  * @gdd_trn: Array of GDD transaction data for ongoing GDD transfers
 140  * @lock: lock to serialize access to GDD
 141  * @fck_nb: DVFS notfifier block
 142  * @fck_rate: clock rate
 143  * @loss_count: To follow if we need to restore context or not
 144  * @max_speed: Maximum TX speed (Kb/s) set by the clients.
 145  * @gdd_gcr: SSI GDD saved context
 146  * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any
 147  * @port: Array of pointers of the ports of the controller
 148  * @dir: Debugfs SSI root directory
 149  */
 150 struct omap_ssi_controller {
 151         struct device           *dev;
 152         void __iomem            *sys;
 153         void __iomem            *gdd;
 154         struct clk              *fck;
 155         unsigned int            gdd_irq;
 156         struct tasklet_struct   gdd_tasklet;
 157         struct gdd_trn          gdd_trn[SSI_MAX_GDD_LCH];
 158         spinlock_t              lock;
 159         struct notifier_block   fck_nb;
 160         unsigned long           fck_rate;
 161         u32                     loss_count;
 162         u32                     max_speed;
 163         /* OMAP SSI Controller context */
 164         u32                     gdd_gcr;
 165         int                     (*get_loss)(struct device *dev);
 166         struct omap_ssi_port    **port;
 167 #ifdef CONFIG_DEBUG_FS
 168         struct dentry *dir;
 169 #endif
 170 };
 171
 172 void omap_ssi_port_update_fclk(struct hsi_controller *ssi,
 173                                struct omap_ssi_port *omap_port);
 174
 175 extern struct platform_driver ssi_port_pdriver;
 176
 177 #endif /* __LINUX_HSI_OMAP_SSI_H__ */