b209e047bc
Add OMAP SSI driver to the HSI subsystem. The Synchronous Serial Interface (SSI) is a legacy version of HSI. As in the case of HSI, it is mainly used to connect Application engines (APE) with cellular modem engines (CMT) in cellular handsets. It provides a multichannel, full-duplex, multi-core communication with no reference clock. The OMAP SSI block is capable of reaching speeds of 110 Mbit/s. Signed-off-by: Carlos Chinea <carlos.chinea@nokia.com> Signed-off-by: Sebastian Reichel <sre@kernel.org> Tested-By: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
166 lines
5.1 KiB
C
166 lines
5.1 KiB
C
/* OMAP SSI internal interface.
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*
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* Copyright (C) 2010 Nokia Corporation. All rights reserved.
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* Copyright (C) 2013 Sebastian Reichel
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*
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* Contact: Carlos Chinea <carlos.chinea@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifndef __LINUX_HSI_OMAP_SSI_H__
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#define __LINUX_HSI_OMAP_SSI_H__
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/hsi/hsi.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#define SSI_MAX_CHANNELS 8
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#define SSI_MAX_GDD_LCH 8
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#define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
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/**
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* struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context
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* @mode: Bit transmission mode
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* @channels: Number of channels
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* @framesize: Frame size in bits
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* @timeout: RX frame timeout
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* @divisor: TX divider
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* @arb_mode: Arbitration mode for TX frame (Round robin, priority)
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*/
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struct omap_ssm_ctx {
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u32 mode;
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u32 channels;
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u32 frame_size;
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union {
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u32 timeout; /* Rx Only */
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struct {
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u32 arb_mode;
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u32 divisor;
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}; /* Tx only */
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};
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};
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/**
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* struct omap_ssi_port - OMAP SSI port data
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* @dev: device associated to the port (HSI port)
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* @pdev: platform device associated to the port
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* @sst_dma: SSI transmitter physical base address
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* @ssr_dma: SSI receiver physical base address
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* @sst_base: SSI transmitter base address
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* @ssr_base: SSI receiver base address
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* @wk_lock: spin lock to serialize access to the wake lines
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* @lock: Spin lock to serialize access to the SSI port
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* @channels: Current number of channels configured (1,2,4 or 8)
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* @txqueue: TX message queues
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* @rxqueue: RX message queues
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* @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)
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* @irq: IRQ number
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* @wake_irq: IRQ number for incoming wake line (-1 if none)
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* @wake_gpio: GPIO number for incoming wake line (-1 if none)
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* @pio_tasklet: Bottom half for PIO transfers and events
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* @wake_tasklet: Bottom half for incoming wake events
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* @wkin_cken: Keep track of clock references due to the incoming wake line
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* @wk_refcount: Reference count for output wake line
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* @sys_mpu_enable: Context for the interrupt enable register for irq 0
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* @sst: Context for the synchronous serial transmitter
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* @ssr: Context for the synchronous serial receiver
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*/
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struct omap_ssi_port {
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struct device *dev;
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struct device *pdev;
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dma_addr_t sst_dma;
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dma_addr_t ssr_dma;
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void __iomem *sst_base;
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void __iomem *ssr_base;
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spinlock_t wk_lock;
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spinlock_t lock;
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unsigned int channels;
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struct list_head txqueue[SSI_MAX_CHANNELS];
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struct list_head rxqueue[SSI_MAX_CHANNELS];
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struct list_head brkqueue;
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unsigned int irq;
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int wake_irq;
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int wake_gpio;
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struct tasklet_struct pio_tasklet;
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struct tasklet_struct wake_tasklet;
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bool wktest:1; /* FIXME: HACK to be removed */
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bool wkin_cken:1; /* Workaround */
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unsigned int wk_refcount;
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/* OMAP SSI port context */
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u32 sys_mpu_enable; /* We use only one irq */
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struct omap_ssm_ctx sst;
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struct omap_ssm_ctx ssr;
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u32 loss_count;
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u32 port_id;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dir;
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#endif
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};
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/**
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* struct gdd_trn - GDD transaction data
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* @msg: Pointer to the HSI message being served
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* @sg: Pointer to the current sg entry being served
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*/
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struct gdd_trn {
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struct hsi_msg *msg;
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struct scatterlist *sg;
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};
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/**
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* struct omap_ssi_controller - OMAP SSI controller data
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* @dev: device associated to the controller (HSI controller)
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* @sys: SSI I/O base address
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* @gdd: GDD I/O base address
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* @fck: SSI functional clock
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* @gdd_irq: IRQ line for GDD
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* @gdd_tasklet: bottom half for DMA transfers
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* @gdd_trn: Array of GDD transaction data for ongoing GDD transfers
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* @lock: lock to serialize access to GDD
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* @loss_count: To follow if we need to restore context or not
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* @max_speed: Maximum TX speed (Kb/s) set by the clients.
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* @sysconfig: SSI controller saved context
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* @gdd_gcr: SSI GDD saved context
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* @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any
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* @port: Array of pointers of the ports of the controller
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* @dir: Debugfs SSI root directory
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*/
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struct omap_ssi_controller {
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struct device *dev;
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void __iomem *sys;
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void __iomem *gdd;
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struct clk *fck;
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unsigned int gdd_irq;
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struct tasklet_struct gdd_tasklet;
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struct gdd_trn gdd_trn[SSI_MAX_GDD_LCH];
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spinlock_t lock;
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unsigned long fck_rate;
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u32 loss_count;
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u32 max_speed;
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/* OMAP SSI Controller context */
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u32 sysconfig;
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u32 gdd_gcr;
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int (*get_loss)(struct device *dev);
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struct omap_ssi_port **port;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dir;
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#endif
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};
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#endif /* __LINUX_HSI_OMAP_SSI_H__ */
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