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.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 /**
  39  * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context
  40  * @mode: Bit transmission mode
  41  * @channels: Number of channels
  42  * @framesize: Frame size in bits
  43  * @timeout: RX frame timeout
  44  * @divisor: TX divider
  45  * @arb_mode: Arbitration mode for TX frame (Round robin, priority)
  46  */
  47 struct omap_ssm_ctx {
  48         u32     mode;
  49         u32     channels;
  50         u32     frame_size;
  51         union   {
  52                         u32     timeout; /* Rx Only */
  53                         struct  {
  54                                         u32     arb_mode;
  55                                         u32     divisor;
  56                         }; /* Tx only */
  57         };
  58 };
  59
  60 /**
  61  * struct omap_ssi_port - OMAP SSI port data
  62  * @dev: device associated to the port (HSI port)
  63  * @pdev: platform device associated to the port
  64  * @sst_dma: SSI transmitter physical base address
  65  * @ssr_dma: SSI receiver physical base address
  66  * @sst_base: SSI transmitter base address
  67  * @ssr_base: SSI receiver base address
  68  * @wk_lock: spin lock to serialize access to the wake lines
  69  * @lock: Spin lock to serialize access to the SSI port
  70  * @channels: Current number of channels configured (1,2,4 or 8)
  71  * @txqueue: TX message queues
  72  * @rxqueue: RX message queues
  73  * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)
  74  * @irq: IRQ number
  75  * @wake_irq: IRQ number for incoming wake line (-1 if none)
  76  * @wake_gpio: GPIO number for incoming wake line (-1 if none)
  77  * @pio_tasklet: Bottom half for PIO transfers and events
  78  * @wake_tasklet: Bottom half for incoming wake events
  79  * @wkin_cken: Keep track of clock references due to the incoming wake line
  80  * @wk_refcount: Reference count for output wake line
  81  * @sys_mpu_enable: Context for the interrupt enable register for irq 0
  82  * @sst: Context for the synchronous serial transmitter
  83  * @ssr: Context for the synchronous serial receiver
  84  */
  85 struct omap_ssi_port {
  86         struct device           *dev;
  87         struct device           *pdev;
  88         dma_addr_t              sst_dma;
  89         dma_addr_t              ssr_dma;
  90         void __iomem            *sst_base;
  91         void __iomem            *ssr_base;
  92         spinlock_t              wk_lock;
  93         spinlock_t              lock;
  94         unsigned int            channels;
  95         struct list_head        txqueue[SSI_MAX_CHANNELS];
  96         struct list_head        rxqueue[SSI_MAX_CHANNELS];
  97         struct list_head        brkqueue;
  98         unsigned int            irq;
  99         int                     wake_irq;
 100         int                     wake_gpio;
 101         struct tasklet_struct   pio_tasklet;
 102         struct tasklet_struct   wake_tasklet;
 103         bool                    wktest:1; /* FIXME: HACK to be removed */
 104         bool                    wkin_cken:1; /* Workaround */
 105         unsigned int            wk_refcount;
 106         /* OMAP SSI port context */
 107         u32                     sys_mpu_enable; /* We use only one irq */
 108         struct omap_ssm_ctx     sst;
 109         struct omap_ssm_ctx     ssr;
 110         u32                     loss_count;
 111         u32                     port_id;
 112 #ifdef CONFIG_DEBUG_FS
 113         struct dentry *dir;
 114 #endif
 115 };
 116
 117 /**
 118  * struct gdd_trn - GDD transaction data
 119  * @msg: Pointer to the HSI message being served
 120  * @sg: Pointer to the current sg entry being served
 121  */
 122 struct gdd_trn {
 123         struct hsi_msg          *msg;
 124         struct scatterlist      *sg;
 125 };
 126
 127 /**
 128  * struct omap_ssi_controller - OMAP SSI controller data
 129  * @dev: device associated to the controller (HSI controller)
 130  * @sys: SSI I/O base address
 131  * @gdd: GDD I/O base address
 132  * @fck: SSI functional clock
 133  * @gdd_irq: IRQ line for GDD
 134  * @gdd_tasklet: bottom half for DMA transfers
 135  * @gdd_trn: Array of GDD transaction data for ongoing GDD transfers
 136  * @lock: lock to serialize access to GDD
 137  * @loss_count: To follow if we need to restore context or not
 138  * @max_speed: Maximum TX speed (Kb/s) set by the clients.
 139  * @sysconfig: SSI controller saved context
 140  * @gdd_gcr: SSI GDD saved context
 141  * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any
 142  * @port: Array of pointers of the ports of the controller
 143  * @dir: Debugfs SSI root directory
 144  */
 145 struct omap_ssi_controller {
 146         struct device           *dev;
 147         void __iomem            *sys;
 148         void __iomem            *gdd;
 149         struct clk              *fck;
 150         unsigned int            gdd_irq;
 151         struct tasklet_struct   gdd_tasklet;
 152         struct gdd_trn          gdd_trn[SSI_MAX_GDD_LCH];
 153         spinlock_t              lock;
 154         unsigned long           fck_rate;
 155         u32                     loss_count;
 156         u32                     max_speed;
 157         /* OMAP SSI Controller context */
 158         u32                     sysconfig;
 159         u32                     gdd_gcr;
 160         int                     (*get_loss)(struct device *dev);
 161         struct omap_ssi_port    **port;
 162 #ifdef CONFIG_DEBUG_FS
 163         struct dentry *dir;
 164 #endif
 165 };
 166
 167 #endif /* __LINUX_HSI_OMAP_SSI_H__ */