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Message-Id: <1273245517-30712-3-git-send-email-carlos.chinea@nokia.com>
Date: Fri, 7 May 2010 18:18:32 +0300
From: Carlos Chinea <carlos.chinea@...ia.com>
To: linux-kernel@...r.kernel.org
Cc: linux-omap@...r.kernel.org
Subject: [RFC PATCHv2 2/7] OMAP SSI: Introducing OMAP SSI driver
Introduces the OMAP SSI driver in the kernel.
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@...ia.com>
---
arch/arm/mach-omap2/ssi.c | 139 +++
arch/arm/plat-omap/include/plat/ssi.h | 196 ++++
drivers/hsi/controllers/omap_ssi.c | 1694 +++++++++++++++++++++++++++++++++
3 files changed, 2029 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-omap2/ssi.c
create mode 100644 arch/arm/plat-omap/include/plat/ssi.h
create mode 100644 drivers/hsi/controllers/omap_ssi.c
diff --git a/arch/arm/mach-omap2/ssi.c b/arch/arm/mach-omap2/ssi.c
new file mode 100644
index 0000000..b46aea8
--- /dev/null
+++ b/arch/arm/mach-omap2/ssi.c
@@ -0,0 +1,139 @@
+/*
+ * linux/arch/arm/mach-omap2/ssi.c
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@...ia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <plat/omap-pm.h>
+#include <plat/ssi.h>
+
+static struct omap_ssi_platform_data ssi_pdata = {
+ .num_ports = SSI_NUM_PORTS,
+ .get_dev_context_loss_count = omap_pm_get_dev_context_loss_count,
+};
+
+static struct resource ssi_resources[] = {
+ /* SSI controller */
+ [0] = {
+ .start = 0x48058000,
+ .end = 0x48058fff,
+ .name = "omap_ssi_sys",
+ .flags = IORESOURCE_MEM,
+ },
+ /* GDD */
+ [1] = {
+ .start = 0x48059000,
+ .end = 0x48059fff,
+ .name = "omap_ssi_gdd",
+ .flags = IORESOURCE_MEM,
+ },
+ [2] = {
+ .start = 71,
+ .end = 71,
+ .name = "ssi_gdd",
+ .flags = IORESOURCE_IRQ,
+ },
+ /* SSI port 1 */
+ [3] = {
+ .start = 0x4805a000,
+ .end = 0x4805a7ff,
+ .name = "omap_ssi_sst1",
+ .flags = IORESOURCE_MEM,
+ },
+ [4] = {
+ .start = 0x4805a800,
+ .end = 0x4805afff,
+ .name = "omap_ssi_ssr1",
+ .flags = IORESOURCE_MEM,
+ },
+ [5] = {
+ .start = 67,
+ .end = 67,
+ .name = "ssi_p1_mpu_irq0",
+ .flags = IORESOURCE_IRQ,
+ },
+ [6] = {
+ .start = 69,
+ .end = 69,
+ .name = "ssi_p1_mpu_irq1",
+ .flags = IORESOURCE_IRQ,
+ },
+ [7] = {
+ .start = 0,
+ .end = 0,
+ .name = "ssi_p1_cawake",
+ .flags = IORESOURCE_IRQ | IORESOURCE_UNSET,
+ },
+};
+
+static void ssi_pdev_release(struct device *dev)
+{
+}
+
+static struct platform_device ssi_pdev = {
+ .name = "omap_ssi",
+ .id = 0,
+ .num_resources = ARRAY_SIZE(ssi_resources),
+ .resource = ssi_resources,
+ .dev = {
+ .release = ssi_pdev_release,
+ .platform_data = &ssi_pdata,
+ },
+};
+
+int __init omap_ssi_config(struct omap_ssi_board_config *ssi_config)
+{
+ unsigned int port, offset, cawake_gpio;
+ int err;
+
+ ssi_pdata.num_ports = ssi_config->num_ports;
+ for (port = 0, offset = 7; port < ssi_config->num_ports;
+ port++, offset += 5) {
+ cawake_gpio = ssi_config->cawake_gpio[port];
+ if (!cawake_gpio)
+ continue; /* Nothing to do */
+ err = gpio_request(cawake_gpio, "cawake");
+ if (err < 0)
+ goto rback;
+ gpio_direction_input(cawake_gpio);
+ ssi_resources[offset].start = gpio_to_irq(cawake_gpio);
+ ssi_resources[offset].flags &= ~IORESOURCE_UNSET;
+ ssi_resources[offset].flags |= IORESOURCE_IRQ_HIGHEDGE |
+ IORESOURCE_IRQ_LOWEDGE;
+ }
+
+ return 0;
+rback:
+ dev_err(&ssi_pdev.dev, "Request cawake (gpio%d) failed\n", cawake_gpio);
+ while (port > 0)
+ gpio_free(ssi_config->cawake_gpio[--port]);
+
+ return err;
+}
+
+static int __init ssi_init(void)
+{
+ return platform_device_register(&ssi_pdev);
+}
+subsys_initcall(ssi_init);
diff --git a/arch/arm/plat-omap/include/plat/ssi.h b/arch/arm/plat-omap/include/plat/ssi.h
new file mode 100644
index 0000000..b077605
--- /dev/null
+++ b/arch/arm/plat-omap/include/plat/ssi.h
@@ -0,0 +1,196 @@
+/*
+ * plat/ssi.h
+ *
+ * Hardware definitions for SSI.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@...ia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef __OMAP_SSI_REGS_H__
+#define __OMAP_SSI_REGS_H__
+
+#define SSI_NUM_PORTS 1
+/*
+ * SSI SYS registers
+ */
+#define SSI_REVISION_REG 0
+# define SSI_REV_MAJOR 0xf0
+# define SSI_REV_MINOR 0xf
+#define SSI_SYSCONFIG_REG 0x10
+# define SSI_AUTOIDLE (1 << 0)
+# define SSI_SOFTRESET (1 << 1)
+# define SSI_SIDLEMODE_FORCE 0
+# define SSI_SIDLEMODE_NO (1 << 3)
+# define SSI_SIDLEMODE_SMART (1 << 4)
+# define SSI_SIDLEMODE_MASK 0x18
+# define SSI_MIDLEMODE_FORCE 0
+# define SSI_MIDLEMODE_NO (1 << 12)
+# define SSI_MIDLEMODE_SMART (1 << 13)
+# define SSI_MIDLEMODE_MASK 0x3000
+#define SSI_SYSSTATUS_REG 0x14
+# define SSI_RESETDONE 1
+#define SSI_MPU_STATUS_REG(port, irq) (0x808 + ((port) * 0x10) + ((irq) * 2))
+#define SSI_MPU_ENABLE_REG(port, irq) (0x80c + ((port) * 0x10) + ((irq) * 8))
+# define SSI_DATAACCEPT(channel) (1 << (channel))
+# define SSI_DATAAVAILABLE(channel) (1 << ((channel) + 8))
+# define SSI_DATAOVERRUN(channel) (1 << ((channel) + 16))
+# define SSI_ERROROCCURED (1 << 24)
+# define SSI_BREAKDETECTED (1 << 25)
+#define SSI_GDD_MPU_IRQ_STATUS_REG 0x0800
+#define SSI_GDD_MPU_IRQ_ENABLE_REG 0x0804
+# define SSI_GDD_LCH(channel) (1 << (channel))
+#define SSI_WAKE_REG(port) (0xc00 + ((port) * 0x10))
+#define SSI_CLEAR_WAKE_REG(port) (0xc04 + ((port) * 0x10))
+#define SSI_SET_WAKE_REG(port) (0xc08 + ((port) * 0x10))
+# define SSI_WAKE(channel) (1 << (channel))
+# define SSI_WAKE_MASK 0xff
+
+/*
+ * SSI SST registers
+ */
+#define SSI_SST_ID_REG 0
+#define SSI_SST_MODE_REG 4
+# define SSI_MODE_VAL_MASK 3
+# define SSI_MODE_SLEEP 0
+# define SSI_MODE_STREAM 1
+# define SSI_MODE_FRAME 2
+# define SSI_MODE_MULTIPOINTS 3
+#define SSI_SST_FRAMESIZE_REG 8
+# define SSI_FRAMESIZE_DEFAULT 31
+#define SSI_SST_TXSTATE_REG 0xc
+# define SSI_TXSTATE_IDLE 0
+#define SSI_SST_BUFSTATE_REG 0x10
+# define SSI_FULL(channel) (1 << (channel))
+#define SSI_SST_DIVISOR_REG 0x18
+# define SSI_MAX_DIVISOR 127
+#define SSI_SST_BREAK_REG 0x20
+#define SSI_SST_CHANNELS_REG 0x24
+# define SSI_CHANNELS_DEFAULT 4
+#define SSI_SST_ARBMODE_REG 0x28
+# define SSI_ARBMODE_ROUNDROBIN 0
+# define SSI_ARBMODE_PRIORITY 1
+#define SSI_SST_BUFFER_CH_REG(channel) (0x80 + ((channel) * 4))
+#define SSI_SST_SWAPBUF_CH_REG(channel) (0xc0 + ((channel) * 4))
+
+/*
+ * SSI SSR registers
+ */
+#define SSI_SSR_ID_REG 0
+#define SSI_SSR_MODE_REG 4
+#define SSI_SSR_FRAMESIZE_REG 8
+#define SSI_SSR_RXSTATE_REG 0xc
+#define SSI_SSR_BUFSTATE_REG 0x10
+# define SSI_NOTEMPTY(channel) (1 << (channel))
+#define SSI_SSR_BREAK_REG 0x1c
+#define SSI_SSR_ERROR_REG 0x20
+#define SSI_SSR_ERRORACK_REG 0x24
+#define SSI_SSR_OVERRUN_REG 0x2c
+#define SSI_SSR_OVERRUNACK_REG 0x30
+#define SSI_SSR_TIMEOUT_REG 0x34
+# define SSI_TIMEOUT_DEFAULT 0
+#define SSI_SSR_CHANNELS_REG 0x28
+#define SSI_SSR_BUFFER_CH_REG(channel) (0x80 + ((channel) * 4))
+#define SSI_SSR_SWAPBUF_CH_REG(channel) (0xc0 + ((channel) * 4))
+
+/*
+ * SSI GDD registers
+ */
+#define SSI_GDD_HW_ID_REG 0
+#define SSI_GDD_PPORT_ID_REG 0x10
+#define SSI_GDD_MPORT_ID_REG 0x14
+#define SSI_GDD_PPORT_SR_REG 0x20
+#define SSI_GDD_MPORT_SR_REG 0x24
+# define SSI_ACTIVE_LCH_NUM_MASK 0xff
+#define SSI_GDD_TEST_REG 0x40
+# define SSI_TEST 1
+#define SSI_GDD_GCR_REG 0x100
+# define SSI_CLK_AUTOGATING_ON (1 << 3)
+# define SSI_FREE (1 << 2)
+# define SSI_SWITCH_OFF (1 << 0)
+#define SSI_GDD_GRST_REG 0x200
+# define SSI_SWRESET 1
+#define SSI_GDD_CSDP_REG(channel) (0x800 + ((channel) * 0x40))
+# define SSI_DST_BURST_EN_MASK 0xc000
+# define SSI_DST_SINGLE_ACCESS0 0
+# define SSI_DST_SINGLE_ACCESS (1 << 14)
+# define SSI_DST_BURST_4x32_BIT (2 << 14)
+# define SSI_DST_BURST_8x32_BIT (3 << 14)
+# define SSI_DST_MASK 0x1e00
+# define SSI_DST_MEMORY_PORT (8 << 9)
+# define SSI_DST_PERIPHERAL_PORT (9 << 9)
+# define SSI_SRC_BURST_EN_MASK 0x180
+# define SSI_SRC_SINGLE_ACCESS0 0
+# define SSI_SRC_SINGLE_ACCESS (1 << 7)
+# define SSI_SRC_BURST_4x32_BIT (2 << 7)
+# define SSI_SRC_BURST_8x32_BIT (3 << 7)
+# define SSI_SRC_MASK 0x3c
+# define SSI_SRC_MEMORY_PORT (8 << 2)
+# define SSI_SRC_PERIPHERAL_PORT (9 << 2)
+# define SSI_DATA_TYPE_MASK 3
+# define SSI_DATA_TYPE_S32 2
+#define SSI_GDD_CCR_REG(channel) (0x802 + ((channel) * 0x40))
+# define SSI_DST_AMODE_MASK (3 << 14)
+# define SSI_DST_AMODE_CONST 0
+# define SSI_DST_AMODE_POSTINC (1 << 12)
+# define SSI_SRC_AMODE_MASK (3 << 12)
+# define SSI_SRC_AMODE_CONST 0
+# define SSI_SRC_AMODE_POSTINC (1 << 12)
+# define SSI_CCR_ENABLE (1 << 7)
+# define SSI_CCR_SYNC_MASK 0x1f
+#define SSI_GDD_CICR_REG(channel) (0x804 + ((channel) * 0x40))
+# define SSI_BLOCK_IE (1 << 5)
+# define SSI_HALF_IE (1 << 2)
+# define SSI_TOUT_IE (1 << 0)
+#define SSI_GDD_CSR_REG(channel) (0x806 + ((channel) * 0x40))
+# define SSI_CSR_SYNC (1 << 6)
+# define SSI_CSR_BLOCK (1 << 5)
+# define SSI_CSR_HALF (1 << 2)
+# define SSI_CSR_TOUR (1 << 0)
+#define SSI_GDD_CSSA_REG(channel) (0x808 + ((channel) * 0x40))
+#define SSI_GDD_CDSA_REG(channel) (0x80c + ((channel) * 0x40))
+#define SSI_GDD_CEN_REG(channel) (0x810 + ((channel) * 0x40))
+#define SSI_GDD_CSAC_REG(channel) (0x818 + ((channel) * 0x40))
+#define SSI_GDD_CDAC_REG(channel) (0x81a + ((channel) * 0x40))
+#define SSI_GDD_CLNK_CTRL_REG(channel) (0x828 + ((channel) * 0x40))
+# define SSI_ENABLE_LNK (1 << 15)
+# define SSI_STOP_LNK (1 << 14)
+# define SSI_NEXT_CH_ID_MASK 0xf
+
+/**
+ * struct omap_ssi_platform_data - OMAP SSI platform data
+ * @num_ports: Number of ports on the controller
+ * @ctxt_loss_count: Pointer to omap_pm_get_dev_context_loss_count
+ */
+struct omap_ssi_platform_data {
+ unsigned int num_ports;
+ int (*get_dev_context_loss_count)(struct device *dev);
+};
+
+/**
+ * struct omap_ssi_config - SSI board configuration
+ * @num_ports: Number of ports in use
+ * @cawake_line: Array of cawake gpio lines
+ */
+struct omap_ssi_board_config {
+ unsigned int num_ports;
+ int cawake_gpio[SSI_NUM_PORTS];
+};
+
+extern int omap_ssi_config(struct omap_ssi_board_config *ssi_config);
+#endif /* __OMAP_SSI_REGS_H__ */
diff --git a/drivers/hsi/controllers/omap_ssi.c b/drivers/hsi/controllers/omap_ssi.c
new file mode 100644
index 0000000..01f5cbe
--- /dev/null
+++ b/drivers/hsi/controllers/omap_ssi.c
@@ -0,0 +1,1694 @@
+/*
+ * omap_ssi.c
+ *
+ * Implements the OMAP SSI driver.
+ *
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *
+ * Contact: Carlos Chinea <carlos.chinea@...ia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#include <linux/err.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/seq_file.h>
+#include <linux/scatterlist.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/hsi/hsi.h>
+#include <linux/debugfs.h>
+#include <plat/omap-pm.h>
+#include <plat/clock.h>
+#include <plat/ssi.h>
+
+#define SSI_MAX_CHANNELS 8
+#define SSI_MAX_GDD_LCH 8
+#define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1)
+
+/**
+ * struct gdd_trn - GDD transaction data
+ * @msg: Pointer to the HSI message being served
+ * @sg: Pointer to the current sg entry being served
+ */
+struct gdd_trn {
+ struct hsi_msg *msg;
+ struct scatterlist *sg;
+};
+
+/**
+ * struct omap_ssi_controller - OMAP SSI controller data
+ * @dev: device associated to the controller (HSI controller)
+ * @sys: SSI I/O base address
+ * @gdd: GDD I/O base address
+ * @ick: SSI interconnect clock
+ * @fck: SSI functional clock
+ * @ck_refcount: References count for clocks
+ * @gdd_irq: IRQ line for GDD
+ * @gdd_tasklet: bottom half for DMA transfers
+ * @gdd_trn: Array of GDD transaction data for ongoing GDD transfers
+ * @lock: lock to serialize access to GDD
+ * @ck_lock: lock to serialize access to the clocks
+ * @rate_change: flag to know if we are in the middle of a DVFS transition
+ * @loss_count: To follow if we need to restore context or not
+ * @sysconfig: SSI controller saved context
+ * @gdd_gcr: SSI GDD saved context
+ * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any
+ * @dir: Debugfs SSI root directory
+ */
+struct omap_ssi_controller {
+ struct device *dev;
+ unsigned long sys;
+ unsigned long gdd;
+ struct clk *ick;
+ struct clk *fck;
+ int ck_refcount;
+ unsigned int gdd_irq;
+ struct tasklet_struct gdd_tasklet;
+ struct gdd_trn gdd_trn[SSI_MAX_GDD_LCH];
+ spinlock_t lock;
+ spinlock_t ck_lock;
+ u32 fck_rate;
+ unsigned int rate_change:1;
+ int loss_count;
+ /* OMAP SSI Controller context */
+ u32 sysconfig;
+ u32 gdd_gcr;
+ int (*get_loss)(struct device *dev);
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *dir;
+#endif
+};
+
+/**
+ * struct omap_ssm_ctx - OMAP synchronous serial module (TX/RX) context
+ * @mode: Bit transmission mode
+ * @channels: Number of channels
+ * @framesize: Frame size in bits
+ * @timeout: RX frame timeout
+ * @divisot: TX divider
+ * @arb_mode: Arbitration mode for TX frame (Round robin, priority)
+ */
+struct omap_ssm_ctx {
+ u32 mode;
+ u32 channels;
+ u32 frame_size;
+ union {
+ u32 timeout; /* Rx Only */
+ struct {
+ u32 arb_mode;
+ u32 divisor;
+ }; /* Tx only */
+ };
+};
+
+/**
+ * struct omap_ssi_port - OMAP SSI port data
+ * @dev: device associated to the port (HSI port)
+ * @sst_dma: SSI transmitter physical base address
+ * @ssr_dma: SSI receiver physical base address
+ * @sst_base: SSI transmitter base address
+ * @ssr_base: SSI receiver base address
+ * @lock: Spin lock to serialize access to the SSI port
+ * @channels: Current number of channels configured (1,2,4 or 8)
+ * @txqueue: TX message queues
+ * @rxqueue: RX message queues
+ * @brkqueue: Queue of incoming HWBREAK requests (FRAME mode)
+ * @irq: IRQ number
+ * @wake_irq: IRQ number for incoming wake line (-1 if none)
+ * @pio_tasklet: Bottom half for PIO transfers and events
+ * @wake_tasklet: Bottom half for incoming wake events
+ * @wkin_cken: Keep track of clock references due to the incoming wake line
+ * @wake_refcount: Reference count for output wake line
+ * @sys_mpu_enable: Context for the interrupt enable register for irq 0
+ * @sst: Context for the synchronous serial transmitter
+ * @ssr: Context for the synchronous serial receiver
+ */
+struct omap_ssi_port {
+ struct device *dev;
+ dma_addr_t sst_dma;
+ dma_addr_t ssr_dma;
+ unsigned long sst_base;
+ unsigned long ssr_base;
+ spinlock_t wk_lock;
+ spinlock_t lock;
+ unsigned int channels;
+ struct list_head txqueue[SSI_MAX_CHANNELS];
+ struct list_head rxqueue[SSI_MAX_CHANNELS];
+ struct list_head brkqueue;
+ unsigned int irq;
+ int wake_irq;
+ struct tasklet_struct pio_tasklet;
+ struct tasklet_struct wake_tasklet;
+ unsigned int wkin_cken:1; /* Workaround */
+ int wk_refcount;
+ /* OMAP SSI port context */
+ u32 sys_mpu_enable; /* We use only one irq */
+ struct omap_ssm_ctx sst;
+ struct omap_ssm_ctx ssr;
+};
+
+static inline unsigned int ssi_wakein(struct hsi_port *port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+
+ return gpio_get_value(irq_to_gpio(omap_port->wake_irq));
+}
+
+static int ssi_set_port_mode(struct device *dev, void *data)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(to_hsi_port(dev));
+ u32 *mode = data;
+
+ __raw_writel(*mode, omap_port->sst_base + SSI_SST_MODE_REG);
+ __raw_writel(*mode, omap_port->ssr_base + SSI_SSR_MODE_REG);
+
+ return 0;
+}
+
+static inline void ssi_set_mode(struct hsi_controller *ssi, u32 mode)
+{
+ device_for_each_child(&ssi->device, &mode, ssi_set_port_mode);
+}
+
+static int ssi_restore_port_mode(struct device *dev, void *data)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(to_hsi_port(dev));
+
+ __raw_writel(omap_port->sst.mode,
+ omap_port->sst_base + SSI_SST_MODE_REG);
+ __raw_writel(omap_port->ssr.mode,
+ omap_port->ssr_base + SSI_SSR_MODE_REG);
+
+ return 0;
+}
+
+static int ssi_restore_port_ctx(struct device *dev, void *data)
+{
+ struct hsi_port *port = to_hsi_port(dev);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(dev->parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long base = omap_port->sst_base;
+
+ __raw_writel(omap_port->sys_mpu_enable,
+ omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ /* SST context */
+ __raw_writel(omap_port->sst.frame_size, base + SSI_SST_FRAMESIZE_REG);
+ __raw_writel(omap_port->sst.divisor, base + SSI_SST_DIVISOR_REG);
+ __raw_writel(omap_port->sst.channels, base + SSI_SST_CHANNELS_REG);
+ __raw_writel(omap_port->sst.arb_mode, base + SSI_SST_ARBMODE_REG);
+ /* SSR context */
+ base = omap_port->ssr_base;
+ __raw_writel(omap_port->ssr.frame_size, base + SSI_SSR_FRAMESIZE_REG);
+ __raw_writel(omap_port->ssr.channels, base + SSI_SSR_CHANNELS_REG);
+ __raw_writel(omap_port->ssr.timeout, base + SSI_SSR_TIMEOUT_REG);
+
+ return 0;
+}
+
+static int ssi_save_port_ctx(struct device *dev, void *data)
+{
+ struct hsi_port *port = to_hsi_port(dev);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(dev->parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ omap_port->sys_mpu_enable = __raw_readl(omap_ssi->sys +
+ SSI_MPU_ENABLE_REG(port->num, 0));
+
+ return 0;
+}
+
+static int ssi_clk_enable(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ int err = 0;
+
+ spin_lock_bh(&omap_ssi->ck_lock);
+ if (omap_ssi->ck_refcount++)
+ goto out;
+
+ err = clk_enable(omap_ssi->fck);
+ if (unlikely(err < 0))
+ goto out;
+ err = clk_enable(omap_ssi->ick);
+ if (unlikely(err < 0)) {
+ clk_disable(omap_ssi->fck);
+ goto out;
+ }
+ if ((omap_ssi->get_loss) && (omap_ssi->loss_count ==
+ (*omap_ssi->get_loss)(ssi->device.parent)))
+ goto mode; /* We always need to restore the mode */
+
+ __raw_writel(omap_ssi->sysconfig, omap_ssi->sys + SSI_SYSCONFIG_REG);
+ __raw_writel(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG);
+
+ device_for_each_child(&ssi->device, NULL, ssi_restore_port_ctx);
+mode:
+ if (!omap_ssi->rate_change)
+ device_for_each_child(&ssi->device, NULL,
+ ssi_restore_port_mode);
+out:
+ spin_unlock_bh(&omap_ssi->ck_lock);
+
+ return err;
+}
+
+static void ssi_clk_disable(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ spin_lock_bh(&omap_ssi->ck_lock);
+ WARN_ON(omap_ssi->ck_refcount <= 0);
+ if (--omap_ssi->ck_refcount)
+ goto out;
+
+ if (!omap_ssi->rate_change)
+ ssi_set_mode(ssi, SSI_MODE_SLEEP);
+
+ if (omap_ssi->get_loss)
+ omap_ssi->loss_count =
+ (*omap_ssi->get_loss)(ssi->device.parent);
+
+ device_for_each_child(&ssi->device, NULL, ssi_save_port_ctx);
+ clk_disable(omap_ssi->ick);
+ clk_disable(omap_ssi->fck);
+
+out:
+ spin_unlock_bh(&omap_ssi->ck_lock);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int ssi_debug_show(struct seq_file *m, void *p)
+{
+ struct hsi_controller *ssi = m->private;
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long sys = omap_ssi->sys;
+
+ ssi_clk_enable(ssi);
+ seq_printf(m, "REVISION\t: 0x%08x\n",
+ __raw_readl(sys + SSI_REVISION_REG));
+ seq_printf(m, "SYSCONFIG\t: 0x%08x\n",
+ __raw_readl(sys + SSI_SYSCONFIG_REG));
+ seq_printf(m, "SYSSTATUS\t: 0x%08x\n",
+ __raw_readl(sys + SSI_SYSSTATUS_REG));
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_debug_port_show(struct seq_file *m, void *p)
+{
+ struct hsi_port *port = m->private;
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long base = omap_ssi->sys;
+ unsigned int ch;
+
+ ssi_clk_enable(ssi);
+ if (omap_port->wake_irq > 0)
+ seq_printf(m, "CAWAKE\t\t: %d\n", ssi_wakein(port));
+ seq_printf(m, "WAKE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_WAKE_REG(port->num)));
+ seq_printf(m, "MPU_ENABLE_IRQ%d\t: 0x%08x\n", 0,
+ __raw_readl(base + SSI_MPU_ENABLE_REG(port->num, 0)));
+ seq_printf(m, "MPU_STATUS_IRQ%d\t: 0x%08x\n", 0,
+ __raw_readl(base + SSI_MPU_STATUS_REG(port->num, 0)));
+ /* SST */
+ base = omap_port->sst_base;
+ seq_printf(m, "\nSST\n===\n");
+ seq_printf(m, "MODE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_MODE_REG));
+ seq_printf(m, "FRAMESIZE\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_FRAMESIZE_REG));
+ seq_printf(m, "DIVISOR\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_DIVISOR_REG));
+ seq_printf(m, "CHANNELS\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_CHANNELS_REG));
+ seq_printf(m, "ARBMODE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_ARBMODE_REG));
+ seq_printf(m, "TXSTATE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_TXSTATE_REG));
+ seq_printf(m, "BUFSTATE\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_BUFSTATE_REG));
+ seq_printf(m, "BREAK\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SST_BREAK_REG));
+ for (ch = 0; ch < omap_port->channels; ch++) {
+ seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch,
+ __raw_readl(base + SSI_SST_BUFFER_CH_REG(ch)));
+ }
+ /* SSR */
+ base = omap_port->ssr_base;
+ seq_printf(m, "\nSSR\n===\n");
+ seq_printf(m, "MODE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_MODE_REG));
+ seq_printf(m, "FRAMESIZE\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_FRAMESIZE_REG));
+ seq_printf(m, "CHANNELS\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_CHANNELS_REG));
+ seq_printf(m, "TIMEOUT\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_TIMEOUT_REG));
+ seq_printf(m, "RXSTATE\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_RXSTATE_REG));
+ seq_printf(m, "BUFSTATE\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_BUFSTATE_REG));
+ seq_printf(m, "BREAK\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_BREAK_REG));
+ seq_printf(m, "ERROR\t\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_ERROR_REG));
+ seq_printf(m, "ERRORACK\t: 0x%08x\n",
+ __raw_readl(base + SSI_SSR_ERRORACK_REG));
+ for (ch = 0; ch < omap_port->channels; ch++) {
+ seq_printf(m, "BUFFER_CH%d\t: 0x%08x\n", ch,
+ __raw_readl(base + SSI_SSR_BUFFER_CH_REG(ch)));
+ }
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_debug_gdd_show(struct seq_file *m, void *p)
+{
+ struct hsi_controller *ssi = m->private;
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long gdd = omap_ssi->gdd;
+ int lch;
+
+ ssi_clk_enable(ssi);
+ seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n",
+ __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG));
+ seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n",
+ __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG));
+ seq_printf(m, "HW_ID\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_HW_ID_REG));
+ seq_printf(m, "PPORT_ID\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_PPORT_ID_REG));
+ seq_printf(m, "MPORT_ID\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_MPORT_ID_REG));
+ seq_printf(m, "TEST\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_TEST_REG));
+ seq_printf(m, "GCR\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_GCR_REG));
+
+ for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
+ seq_printf(m, "\nGDD LCH %d\n=========\n", lch);
+ seq_printf(m, "CSDP\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CSDP_REG(lch)));
+ seq_printf(m, "CCR\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CCR_REG(lch)));
+ seq_printf(m, "CICR\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CICR_REG(lch)));
+ seq_printf(m, "CSR\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CSR_REG(lch)));
+ seq_printf(m, "CSSA\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_CSSA_REG(lch)));
+ seq_printf(m, "CDSA\t\t: 0x%08x\n",
+ __raw_readl(gdd + SSI_GDD_CDSA_REG(lch)));
+ seq_printf(m, "CEN\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CEN_REG(lch)));
+ seq_printf(m, "CSAC\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CSAC_REG(lch)));
+ seq_printf(m, "CDAC\t\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CDAC_REG(lch)));
+ seq_printf(m, "CLNK_CTRL\t: 0x%04x\n",
+ __raw_readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch)));
+ }
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_regs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ssi_debug_show, inode->i_private);
+}
+
+static int ssi_port_regs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ssi_debug_port_show, inode->i_private);
+}
+
+static int ssi_gdd_regs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ssi_debug_gdd_show, inode->i_private);
+}
+
+static const struct file_operations ssi_regs_fops = {
+ .open = ssi_regs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct file_operations ssi_port_regs_fops = {
+ .open = ssi_port_regs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct file_operations ssi_gdd_regs_fops = {
+ .open = ssi_gdd_regs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init ssi_debug_add_port(struct device *dev, void *data)
+{
+ struct hsi_port *port = to_hsi_port(dev);
+ struct dentry *dir = data;
+
+ dir = debugfs_create_dir(dev_name(dev), dir);
+ if (IS_ERR(dir))
+ return PTR_ERR(dir);
+ debugfs_create_file("regs", S_IRUGO, dir, port, &ssi_port_regs_fops);
+
+ return 0;
+}
+
+static int __init ssi_debug_add_ctrl(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct dentry *dir;
+ int err;
+
+ /* SSI controller */
+ omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL);
+ if (IS_ERR(omap_ssi->dir))
+ return PTR_ERR(omap_ssi->dir);
+
+ debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi,
+ &ssi_regs_fops);
+ /* SSI GDD (DMA) */
+ dir = debugfs_create_dir("gdd", omap_ssi->dir);
+ if (IS_ERR(dir))
+ goto rback;
+ debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops);
+ /* SSI ports */
+ err = device_for_each_child(&ssi->device, omap_ssi->dir,
+ ssi_debug_add_port);
+ if (err < 0)
+ goto rback;
+
+ return 0;
+rback:
+ debugfs_remove_recursive(omap_ssi->dir);
+
+ return PTR_ERR(dir);
+}
+
+static void ssi_debug_remove_ctrl(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ debugfs_remove_recursive(omap_ssi->dir);
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static int ssi_claim_lch(struct hsi_msg *msg)
+{
+
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ int lch;
+
+ for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++)
+ if (!omap_ssi->gdd_trn[lch].msg) {
+ omap_ssi->gdd_trn[lch].msg = msg;
+ omap_ssi->gdd_trn[lch].sg = msg->sgt.sgl;
+ return lch;
+ }
+
+ return -EBUSY;
+}
+
+static int ssi_start_pio(struct hsi_msg *msg)
+{
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ u32 val;
+
+ ssi_clk_enable(ssi);
+ if (msg->ttype == HSI_MSG_WRITE) {
+ val = SSI_DATAACCEPT(msg->channel);
+ ssi_clk_enable(ssi); /* Hold clocks for pio writes */
+ } else {
+ val = SSI_DATAAVAILABLE(msg->channel) | SSI_ERROROCCURED;
+ }
+ dev_dbg(&port->device, "Single %s transfer\n",
+ msg->ttype ? "write" : "read");
+ val |= __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ ssi_clk_disable(ssi);
+ msg->actual_len = 0;
+ msg->status = HSI_STATUS_PROCEDING;
+
+ return 0;
+}
+
+static int ssi_start_dma(struct hsi_msg *msg, int lch)
+{
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long gdd = omap_ssi->gdd;
+ int err;
+ u16 csdp;
+ u16 ccr;
+ u32 s_addr;
+ u32 d_addr;
+ u32 tmp;
+
+ if (msg->ttype == HSI_MSG_READ) {
+ err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
+ DMA_FROM_DEVICE);
+ if (err < 0) {
+ dev_dbg(&ssi->device, "DMA map SG failed !\n");
+ return err;
+ }
+ csdp = SSI_DST_BURST_4x32_BIT | SSI_DST_MEMORY_PORT |
+ SSI_SRC_SINGLE_ACCESS0 | SSI_SRC_PERIPHERAL_PORT |
+ SSI_DATA_TYPE_S32;
+ ccr = msg->channel + 0x10 + (port->num * 8); /* Sync */
+ ccr |= SSI_DST_AMODE_POSTINC | SSI_SRC_AMODE_CONST |
+ SSI_CCR_ENABLE;
+ s_addr = omap_port->ssr_dma +
+ SSI_SSR_BUFFER_CH_REG(msg->channel);
+ d_addr = sg_dma_address(msg->sgt.sgl);
+ } else {
+ err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
+ DMA_TO_DEVICE);
+ if (err < 0) {
+ dev_dbg(&ssi->device, "DMA map SG failed !\n");
+ return err;
+ }
+ csdp = SSI_SRC_BURST_4x32_BIT | SSI_SRC_MEMORY_PORT |
+ SSI_DST_SINGLE_ACCESS0 | SSI_DST_PERIPHERAL_PORT |
+ SSI_DATA_TYPE_S32;
+ ccr = (msg->channel + 1 + (port->num * 8)) & 0xf; /* Sync */
+ ccr |= SSI_SRC_AMODE_POSTINC | SSI_DST_AMODE_CONST |
+ SSI_CCR_ENABLE;
+ s_addr = sg_dma_address(msg->sgt.sgl);
+ d_addr = omap_port->sst_dma +
+ SSI_SST_BUFFER_CH_REG(msg->channel);
+ }
+ dev_dbg(&ssi->device, "lch %d cdsp %08x ccr %04x s_addr %08x"
+ " d_addr %08x\n", lch, csdp, ccr, s_addr, d_addr);
+ ssi_clk_enable(ssi); /* Hold clocks during the transfer */
+ __raw_writew(csdp, gdd + SSI_GDD_CSDP_REG(lch));
+ __raw_writew(SSI_BLOCK_IE | SSI_TOUT_IE, gdd + SSI_GDD_CICR_REG(lch));
+ __raw_writel(d_addr, gdd + SSI_GDD_CDSA_REG(lch));
+ __raw_writel(s_addr, gdd + SSI_GDD_CSSA_REG(lch));
+ __raw_writew(SSI_BYTES_TO_FRAMES(msg->sgt.sgl->length),
+ gdd + SSI_GDD_CEN_REG(lch));
+ tmp = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ tmp |= SSI_GDD_LCH(lch);
+ __raw_writel(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ __raw_writew(ccr, gdd + SSI_GDD_CCR_REG(lch));
+ msg->status = HSI_STATUS_PROCEDING;
+
+ return 0;
+}
+
+static int ssi_start_transfer(struct list_head *queue)
+{
+ struct hsi_msg *msg;
+ int lch = -1;
+
+ if (list_empty(queue))
+ return 0;
+ msg = list_first_entry(queue, struct hsi_msg, link);
+ if (msg->status != HSI_STATUS_QUEUED)
+ return 0;
+ if ((msg->sgt.nents) && (msg->sgt.sgl->length > sizeof(u32)))
+ lch = ssi_claim_lch(msg);
+ if (lch >= 0)
+ return ssi_start_dma(msg, lch);
+ else
+ return ssi_start_pio(msg);
+}
+
+static void ssi_error(struct hsi_port *port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ unsigned int i;
+ u32 err;
+ u32 val;
+ u32 tmp;
+
+ /* ACK error */
+ err = __raw_readl(omap_port->ssr_base + SSI_SSR_ERROR_REG);
+ dev_err(&port->device, "SSI error: 0x%02x\n", err);
+ if (!err) {
+ dev_dbg(&port->device, "spurious SSI error ignored!\n");
+ return;
+ }
+ /* Cancel all GDD read transfers */
+ for (i = 0, val = 0; i < SSI_MAX_GDD_LCH; i++) {
+ msg = omap_ssi->gdd_trn[i].msg;
+ if ((msg) && (msg->ttype == HSI_MSG_READ)) {
+ __raw_writew(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
+ val |= (1 << i);
+ omap_ssi->gdd_trn[i].msg = NULL;
+ }
+ }
+ tmp = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ tmp &= ~val;
+ __raw_writel(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ /* Cancel all PIO read transfers */
+ tmp = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ tmp &= 0xfeff00ff; /* Disable error & all dataavailable interrupts */
+ __raw_writel(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ /* Signal the error all current pending read requests */
+ for (i = 0; i < omap_port->channels; i++) {
+ if (list_empty(&omap_port->rxqueue[i]))
+ continue;
+ msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg,
+ link);
+ list_del(&msg->link);
+ msg->status = HSI_STATUS_ERROR;
+ msg->complete(msg);
+ /* Now restart queued reads if any */
+ ssi_start_transfer(&omap_port->rxqueue[i]);
+ }
+ /* ACK error */
+ __raw_writel(err, omap_port->ssr_base + SSI_SSR_ERRORACK_REG);
+}
+
+static void ssi_break_complete(struct hsi_port *port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ struct hsi_msg *tmp;
+ u32 val;
+
+ dev_dbg(&port->device, "HWBREAK received\n");
+
+ spin_lock(&omap_port->lock);
+ val = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ val &= ~SSI_BREAKDETECTED;
+ __raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(0, omap_port->ssr_base + SSI_SSR_BREAK_REG);
+ spin_unlock(&omap_port->lock);
+
+ list_for_each_entry_safe(msg, tmp, &omap_port->brkqueue, link) {
+ msg->status = HSI_STATUS_COMPLETED;
+ list_del(&msg->link);
+ msg->complete(msg);
+ }
+
+}
+
+static int ssi_async_break(struct hsi_msg *msg)
+{
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ int err = 0;
+ u32 tmp;
+
+ ssi_clk_enable(ssi);
+ if (msg->ttype == HSI_MSG_WRITE) {
+ if (omap_port->sst.mode != SSI_MODE_FRAME) {
+ err = -EINVAL;
+ goto out;
+ }
+ __raw_writel(1, omap_port->sst_base + SSI_SST_BREAK_REG);
+ msg->status = HSI_STATUS_COMPLETED;
+ msg->complete(msg);
+ } else {
+ if (omap_port->ssr.mode != SSI_MODE_FRAME) {
+ err = -EINVAL;
+ goto out;
+ }
+ spin_lock_bh(&omap_port->lock);
+ tmp = __raw_readl(omap_ssi->sys +
+ SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(tmp | SSI_BREAKDETECTED,
+ omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ msg->status = HSI_STATUS_PROCEDING;
+ list_add_tail(&msg->link, &omap_port->brkqueue);
+ spin_unlock_bh(&omap_port->lock);
+ }
+out:
+ ssi_clk_disable(ssi);
+
+ return err;
+}
+
+static int ssi_async(struct hsi_msg *msg)
+{
+ struct hsi_port *port = hsi_get_port(msg->cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct list_head *queue;
+ int err;
+
+ BUG_ON(!msg);
+
+ if (msg->sgt.nents > 1)
+ return -ENOSYS; /* TODO: Add sg support */
+
+ if (msg->break_frame)
+ return ssi_async_break(msg);
+
+ if (msg->ttype) {
+ BUG_ON(msg->channel >= omap_port->sst.channels);
+ queue = &omap_port->txqueue[msg->channel];
+ } else {
+ BUG_ON(msg->channel >= omap_port->ssr.channels);
+ queue = &omap_port->rxqueue[msg->channel];
+ }
+ msg->status = HSI_STATUS_QUEUED;
+ spin_lock_bh(&omap_port->lock);
+ list_add_tail(&msg->link, queue);
+ err = ssi_start_transfer(queue);
+ spin_unlock_bh(&omap_port->lock);
+
+ dev_dbg(&port->device, "msg status %d ttype %d ch %d\n",
+ msg->status, msg->ttype, msg->channel);
+
+ return err;
+}
+
+static void ssi_flush_queue(struct list_head *queue, struct hsi_client *cl)
+{
+ struct list_head *node, *tmp;
+ struct hsi_msg *msg;
+
+ list_for_each_safe(node, tmp, queue) {
+ msg = list_entry(node, struct hsi_msg, link);
+ if ((cl) && (cl != msg->cl))
+ continue;
+ list_del(node);
+ pr_debug("flush queue: ch %d, msg %p len %d type %d ctxt %p\n",
+ msg->channel, msg, msg->sgt.sgl->length,
+ msg->ttype, msg->context);
+ if (msg->destructor)
+ msg->destructor(msg);
+ else
+ hsi_free_msg(msg);
+ }
+}
+
+static u32 ssi_calculate_div(struct hsi_controller *ssi, u32 max_speed)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ u32 tx_fckrate = omap_ssi->fck_rate;
+
+ /* / 2 : SSI TX clock is always half of the SSI functional clock */
+ tx_fckrate >>= 1;
+ /* Round down when tx_fckrate % max_speed == 0 */
+ tx_fckrate--;
+ dev_dbg(&ssi->device, "TX divisor is %d for fck_rate %d speed %d\n",
+ tx_fckrate / max_speed, omap_ssi->fck_rate, max_speed);
+
+ return tx_fckrate / max_speed;
+}
+
+static int ssi_setup(struct hsi_client *cl)
+{
+ struct hsi_port *port = to_hsi_port(cl->device.parent);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ unsigned long sst = omap_port->sst_base;
+ unsigned long ssr = omap_port->ssr_base;
+ u32 div = 0;
+ int err = 0;
+
+ ssi_clk_enable(ssi);
+ spin_lock_bh(&omap_port->lock);
+
+ if (cl->tx_cfg.speed)
+ div = ssi_calculate_div(ssi, cl->tx_cfg.speed);
+
+ if (div > SSI_MAX_DIVISOR) {
+ dev_err(&cl->device, "Invalid TX speed %d Mb/s (div %d)\n",
+ cl->tx_cfg.speed, div);
+ err = -EINVAL;
+ goto out;
+ }
+ /* Set TX module to sleep to stop TX during cfg update */
+ __raw_writel(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG);
+ __raw_writel(31, sst + SSI_SST_FRAMESIZE_REG);
+ __raw_writel(div, sst + SSI_SST_DIVISOR_REG);
+ __raw_writel(cl->tx_cfg.channels, sst + SSI_SST_CHANNELS_REG);
+ __raw_writel(cl->tx_cfg.arb_mode, sst + SSI_SST_ARBMODE_REG);
+ __raw_writel(cl->tx_cfg.mode, sst + SSI_SST_MODE_REG);
+ /* Set RX module to sleep to stop RX during cfg update */
+ __raw_writel(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG);
+ __raw_writel(31, ssr + SSI_SSR_FRAMESIZE_REG);
+ __raw_writel(cl->rx_cfg.channels, ssr + SSI_SSR_CHANNELS_REG);
+ __raw_writel(0, ssr + SSI_SSR_TIMEOUT_REG);
+ /* Cleanup the break queue if we leave FRAME mode */
+ if ((omap_port->ssr.mode == SSI_MODE_FRAME) &&
+ (cl->rx_cfg.mode != SSI_MODE_FRAME))
+ ssi_flush_queue(&omap_port->brkqueue, cl);
+ __raw_writel(cl->rx_cfg.mode, ssr + SSI_SSR_MODE_REG);
+ omap_port->channels = max(cl->rx_cfg.channels, cl->tx_cfg.channels);
+ /* Shadow registering for OFF mode */
+ /* SST */
+ omap_port->sst.divisor = div;
+ omap_port->sst.frame_size = 31;
+ omap_port->sst.channels = cl->tx_cfg.channels;
+ omap_port->sst.arb_mode = cl->tx_cfg.arb_mode;
+ omap_port->sst.mode = cl->tx_cfg.mode;
+ /* SSR */
+ omap_port->ssr.frame_size = 31;
+ omap_port->ssr.timeout = 0;
+ omap_port->ssr.channels = cl->rx_cfg.channels;
+ omap_port->ssr.mode = cl->rx_cfg.mode;
+out:
+ spin_unlock_bh(&omap_port->lock);
+ ssi_clk_disable(ssi);
+
+ return err;
+}
+
+static void ssi_cleanup_queues(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ unsigned int i;
+ u32 rxbufstate = 0;
+ u32 txbufstate = 0;
+ u32 status = SSI_ERROROCCURED;
+ u32 tmp;
+
+ ssi_flush_queue(&omap_port->brkqueue, cl);
+ if (list_empty(&omap_port->brkqueue))
+ status |= SSI_BREAKDETECTED;
+
+ for (i = 0; i < omap_port->channels; i++) {
+ msg = list_first_entry(&omap_port->txqueue[i], struct hsi_msg,
+ link);
+ if ((msg) && (msg->cl == cl)) {
+ txbufstate |= (1 << i);
+ status |= SSI_DATAACCEPT(i);
+ /* Release the clocks writes, also GDD ones */
+ ssi_clk_disable(ssi);
+ }
+ ssi_flush_queue(&omap_port->txqueue[i], cl);
+ msg = list_first_entry(&omap_port->rxqueue[i], struct hsi_msg,
+ link);
+ if ((msg) && (msg->cl == cl)) {
+ rxbufstate |= (1 << i);
+ status |= SSI_DATAAVAILABLE(i);
+ }
+ ssi_flush_queue(&omap_port->rxqueue[i], cl);
+ /* Check if we keep the error detection interrupt armed */
+ if (!list_empty(&omap_port->rxqueue[i]))
+ status &= ~SSI_ERROROCCURED;
+ }
+ /* Cleanup write buffers */
+ tmp = __raw_readl(omap_port->sst_base + SSI_SST_BUFSTATE_REG);
+ tmp &= ~txbufstate;
+ __raw_writel(tmp, omap_port->sst_base + SSI_SST_BUFSTATE_REG);
+ /* Cleanup read buffers */
+ tmp = __raw_readl(omap_port->ssr_base + SSI_SSR_BUFSTATE_REG);
+ tmp &= ~rxbufstate;
+ __raw_writel(tmp, omap_port->ssr_base + SSI_SSR_BUFSTATE_REG);
+ /* Disarm and ack pending interrupts */
+ tmp = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ tmp &= ~status;
+ __raw_writel(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(status, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
+}
+
+static void ssi_cleanup_gdd(struct hsi_controller *ssi, struct hsi_client *cl)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ unsigned int i;
+ u32 val = 0;
+ u32 tmp;
+
+ for (i = 0; i < SSI_MAX_GDD_LCH; i++) {
+ msg = omap_ssi->gdd_trn[i].msg;
+ if ((!msg) || (msg->cl != cl))
+ continue;
+ __raw_writew(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
+ val |= (1 << i);
+ /*
+ * Clock references for write will be handled in
+ * ssi_cleanup_queues
+ */
+ if (msg->ttype == HSI_MSG_READ)
+ ssi_clk_disable(ssi);
+ omap_ssi->gdd_trn[i].msg = NULL;
+ }
+ tmp = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ tmp &= ~val;
+ __raw_writel(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ __raw_writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+}
+
+static int ssi_release(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+
+ ssi_clk_enable(ssi);
+ spin_lock_bh(&omap_port->lock);
+ /* Stop all communications */
+ __raw_writel(SSI_MODE_SLEEP, omap_port->sst_base + SSI_SST_MODE_REG);
+ __raw_writel(SSI_MODE_SLEEP, omap_port->ssr_base + SSI_SSR_MODE_REG);
+ /* Stop all the pending DMA requests for that client */
+ ssi_cleanup_gdd(ssi, cl);
+ /* Now cleanup all the queues */
+ ssi_cleanup_queues(cl);
+ /* Restart communications */
+ ssi_restore_port_mode(&port->device, NULL);
+ spin_unlock_bh(&omap_port->lock);
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_flush(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg;
+ unsigned long sst = omap_port->sst_base;
+ unsigned long ssr = omap_port->ssr_base;
+ unsigned int i;
+ u32 err;
+
+ ssi_clk_enable(ssi);
+ spin_lock_bh(&omap_port->lock);
+ /* Stop all communications */
+ __raw_writel(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG);
+ __raw_writel(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG);
+ /* Stop all DMA transfers */
+ for (i = 0; i < SSI_MAX_GDD_LCH; i++) {
+ msg = omap_ssi->gdd_trn[i].msg;
+ if (!msg || (port != hsi_get_port(msg->cl)))
+ continue;
+ __raw_writew(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i));
+ if (msg->ttype == HSI_MSG_READ)
+ ssi_clk_disable(ssi);
+ omap_ssi->gdd_trn[i].msg = NULL;
+ }
+ /* Flush all SST buffers */
+ __raw_writel(0, sst + SSI_SST_BUFSTATE_REG);
+ __raw_writel(0, sst + SSI_SST_TXSTATE_REG);
+ /* Flush all SSR buffers */
+ __raw_writel(0, ssr + SSI_SSR_RXSTATE_REG);
+ __raw_writel(0, ssr + SSI_SSR_BUFSTATE_REG);
+ /* Flush all errors */
+ err = __raw_readl(ssr + SSI_SSR_ERROR_REG);
+ __raw_writel(err, ssr + SSI_SSR_ERRORACK_REG);
+ /* Flush break */
+ __raw_writel(0, ssr + SSI_SSR_BREAK_REG);
+ /* Clear interrupts */
+ __raw_writel(0, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(0xffffff00,
+ omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0));
+ __raw_writel(0, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ __raw_writel(0xff, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+ /* Dequeue all pending requests */
+ for (i = 0; i < omap_port->channels; i++) {
+ /* Release write clocks */
+ if (!list_empty(&omap_port->txqueue[i]))
+ ssi_clk_disable(ssi);
+ ssi_flush_queue(&omap_port->txqueue[i], NULL);
+ ssi_flush_queue(&omap_port->rxqueue[i], NULL);
+ }
+ ssi_flush_queue(&omap_port->brkqueue, NULL);
+ /* Restart communications */
+ ssi_restore_port_mode(&port->device, NULL);
+ spin_unlock_bh(&omap_port->lock);
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static int ssi_start_tx(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ dev_dbg(&port->device, "Wake out high %d\n", omap_port->wk_refcount);
+
+ spin_lock_bh(&omap_port->wk_lock);
+ if (omap_port->wk_refcount++) {
+ spin_unlock_bh(&omap_port->wk_lock);
+ return 0;
+ }
+ ssi_clk_enable(ssi); /* Grab clocks */
+ __raw_writel(SSI_WAKE(0), omap_ssi->sys + SSI_SET_WAKE_REG(port->num));
+ spin_unlock_bh(&omap_port->wk_lock);
+
+ return 0;
+}
+
+static int ssi_stop_tx(struct hsi_client *cl)
+{
+ struct hsi_port *port = hsi_get_port(cl);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ dev_dbg(&port->device, "Wake out low %d\n", omap_port->wk_refcount);
+
+ spin_lock_bh(&omap_port->wk_lock);
+ BUG_ON(!omap_port->wk_refcount);
+ if (--omap_port->wk_refcount) {
+ spin_unlock_bh(&omap_port->wk_lock);
+ return 0;
+ }
+ __raw_writel(SSI_WAKE(0),
+ omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
+ ssi_clk_disable(ssi); /* Release clocks */
+ spin_unlock_bh(&omap_port->wk_lock);
+
+ return 0;
+}
+
+static void ssi_pio_complete(struct hsi_port *port, struct list_head *queue)
+{
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct hsi_msg *msg;
+ u32 *buf;
+ u32 val;
+
+ spin_lock(&omap_port->lock);
+ msg = list_first_entry(queue, struct hsi_msg, link);
+ if ((!msg->sgt.nents) || (!msg->sgt.sgl->length)) {
+ msg->actual_len = 0;
+ msg->status = HSI_STATUS_PENDING;
+ }
+ if (msg->status == HSI_STATUS_PROCEDING) {
+ buf = sg_virt(msg->sgt.sgl) + msg->actual_len;
+ if (msg->ttype == HSI_MSG_WRITE)
+ __raw_writel(*buf, omap_port->sst_base +
+ SSI_SST_BUFFER_CH_REG(msg->channel));
+ else
+ *buf = __raw_readl(omap_port->ssr_base +
+ SSI_SSR_BUFFER_CH_REG(msg->channel));
+ dev_dbg(&port->device, "ch %d ttype %d 0x%08x\n", msg->channel,
+ msg->ttype, *buf);
+ msg->actual_len += sizeof(*buf);
+ if (msg->actual_len >= msg->sgt.sgl->length)
+ msg->status = HSI_STATUS_COMPLETED;
+ /*
+ * Wait for the last written frame to be really sent before
+ * we call the complete callback
+ */
+ if ((msg->status == HSI_STATUS_PROCEDING) ||
+ ((msg->status == HSI_STATUS_COMPLETED) &&
+ (msg->ttype == HSI_MSG_WRITE)))
+ goto out;
+
+ }
+ if (msg->status == HSI_STATUS_PROCEDING)
+ goto out;
+ /* Transfer completed at this point */
+ val = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ if (msg->ttype == HSI_MSG_WRITE) {
+ val &= ~SSI_DATAACCEPT(msg->channel);
+ ssi_clk_disable(ssi); /* Release clocks for write transfer */
+ } else {
+ val &= ~SSI_DATAAVAILABLE(msg->channel);
+ }
+ __raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ list_del(&msg->link);
+ spin_unlock(&omap_port->lock);
+ msg->complete(msg);
+ spin_lock(&omap_port->lock);
+ ssi_start_transfer(queue);
+out:
+ spin_unlock(&omap_port->lock);
+}
+
+static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg;
+ struct hsi_port *port = to_hsi_port(msg->cl->device.parent);
+ unsigned int dir;
+ u32 csr;
+ u32 val;
+
+ spin_lock(&omap_ssi->lock);
+
+ val = __raw_readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+ val &= ~SSI_GDD_LCH(lch);
+ __raw_writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG);
+
+ if (msg->ttype == HSI_MSG_READ) {
+ dir = DMA_FROM_DEVICE;
+ val = SSI_DATAAVAILABLE(msg->channel);
+ ssi_clk_disable(ssi);
+ } else {
+ dir = DMA_TO_DEVICE;
+ val = SSI_DATAACCEPT(msg->channel);
+ /* Keep clocks reference for write pio event */
+ }
+ dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir);
+ csr = __raw_readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch));
+ omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */
+ if (csr & SSI_CSR_TOUR) { /* Timeout error */
+ msg->status = HSI_STATUS_ERROR;
+ msg->actual_len = 0;
+ list_del(&msg->link); /* Dequeue msg */
+ spin_unlock(&omap_ssi->lock);
+ msg->complete(msg);
+ return;
+ }
+
+ val |= __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ __raw_writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
+
+ msg->status = HSI_STATUS_COMPLETED;
+ msg->actual_len = sg_dma_len(msg->sgt.sgl);
+ spin_unlock(&omap_ssi->lock);
+}
+
+static void ssi_gdd_tasklet(unsigned long dev)
+{
+ struct hsi_controller *ssi = (struct hsi_controller *)dev;
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long sys = omap_ssi->sys;
+ unsigned int lch;
+ u32 status_reg;
+
+ ssi_clk_enable(ssi);
+
+ status_reg = __raw_readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+ for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) {
+ if (status_reg & SSI_GDD_LCH(lch))
+ ssi_gdd_complete(ssi, lch);
+ }
+ __raw_writel(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+ status_reg = __raw_readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG);
+ ssi_clk_disable(ssi);
+ if (status_reg)
+ tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
+ else
+ enable_irq(omap_ssi->gdd_irq);
+
+}
+
+static irqreturn_t ssi_gdd_isr(int irq, void *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ tasklet_hi_schedule(&omap_ssi->gdd_tasklet);
+ disable_irq_nosync(irq);
+
+ return IRQ_HANDLED;
+}
+
+static void ssi_pio_tasklet(unsigned long ssi_port)
+{
+ struct hsi_port *port = (struct hsi_port *)ssi_port;
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned long sys = omap_ssi->sys;
+ unsigned int ch;
+ u32 status_reg;
+
+ ssi_clk_enable(ssi);
+ status_reg = __raw_readl(sys + SSI_MPU_STATUS_REG(port->num, 0));
+ status_reg &= __raw_readl(sys + SSI_MPU_ENABLE_REG(port->num, 0));
+
+ for (ch = 0; ch < omap_port->channels; ch++) {
+ if (status_reg & SSI_DATAACCEPT(ch))
+ ssi_pio_complete(port, &omap_port->txqueue[ch]);
+ if (status_reg & SSI_DATAAVAILABLE(ch))
+ ssi_pio_complete(port, &omap_port->rxqueue[ch]);
+ }
+ if (status_reg & SSI_BREAKDETECTED)
+ ssi_break_complete(port);
+ if (status_reg & SSI_ERROROCCURED)
+ ssi_error(port);
+ __raw_writel(status_reg, sys + SSI_MPU_STATUS_REG(port->num, 0));
+
+ status_reg = __raw_readl(sys + SSI_MPU_STATUS_REG(port->num, 0));
+ status_reg &= __raw_readl(sys + SSI_MPU_ENABLE_REG(port->num, 0));
+ ssi_clk_disable(ssi);
+
+ if (status_reg)
+ tasklet_hi_schedule(&omap_port->pio_tasklet);
+ else
+ enable_irq(omap_port->irq);
+}
+
+static irqreturn_t ssi_pio_isr(int irq, void *port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+
+ tasklet_hi_schedule(&omap_port->pio_tasklet);
+ disable_irq_nosync(irq);
+
+ return IRQ_HANDLED;
+}
+
+static void ssi_wake_tasklet(unsigned long ssi_port)
+{
+ struct hsi_port *port = (struct hsi_port *)ssi_port;
+ struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+
+ if (ssi_wakein(port)) {
+ /**
+ * We can have a quick High-Low-High transition in the line.
+ * In such a case if we have long interrupt latencies,
+ * we can miss the low event or get twice a high event.
+ * This workaround will avoid breaking the clock reference
+ * count when such a situation occurs.
+ */
+ if (!omap_port->wkin_cken) {
+ omap_port->wkin_cken = 1;
+ ssi_clk_enable(ssi);
+ }
+ hsi_event(port, HSI_EVENT_START_RX);
+ } else {
+ hsi_event(port, HSI_EVENT_STOP_RX);
+ if (omap_port->wkin_cken) {
+ ssi_clk_disable(ssi);
+ omap_port->wkin_cken = 0;
+ }
+ }
+}
+
+static irqreturn_t ssi_wake_isr(int irq, void *ssi_port)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(ssi_port);
+
+ tasklet_hi_schedule(&omap_port->wake_tasklet);
+
+ return IRQ_HANDLED;
+}
+
+static int __init ssi_port_irq(struct hsi_port *port,
+ struct platform_device *pd)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct resource *irq;
+ int err;
+
+ irq = platform_get_resource(pd, IORESOURCE_IRQ, (port->num * 3) + 1);
+ if (!irq) {
+ dev_err(&port->device, "Port IRQ resource missing\n");
+ return -ENXIO;
+ }
+ omap_port->irq = irq->start;
+ tasklet_init(&omap_port->pio_tasklet, ssi_pio_tasklet,
+ (unsigned long)port);
+ err = devm_request_irq(&pd->dev, omap_port->irq, ssi_pio_isr,
+ IRQF_DISABLED, irq->name, port);
+ if (err < 0)
+ dev_err(&port->device, "Request IRQ %d failed (%d)\n",
+ omap_port->irq, err);
+ return err;
+}
+
+static int __init ssi_wake_irq(struct hsi_port *port,
+ struct platform_device *pd)
+{
+ struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
+ struct resource *irq;
+ int err;
+
+ irq = platform_get_resource(pd, IORESOURCE_IRQ, (port->num * 3) + 3);
+ if (!irq) {
+ dev_err(&port->device, "Wake in IRQ resource missing");
+ return -ENXIO;
+ }
+ if (irq->flags & IORESOURCE_UNSET) {
+ dev_info(&port->device, "No Wake in support\n");
+ omap_port->wake_irq = -1;
+ return 0;
+ }
+ omap_port->wake_irq = irq->start;
+ tasklet_init(&omap_port->wake_tasklet, ssi_wake_tasklet,
+ (unsigned long)port);
+ err = devm_request_irq(&pd->dev, omap_port->wake_irq, ssi_wake_isr,
+ IRQF_DISABLED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ irq->name, port);
+ if (err < 0)
+ dev_err(&port->device, "Request Wake in IRQ %d failed (%d)\n",
+ omap_port->wake_irq, err);
+ return err;
+}
+
+static void __init ssi_queues_init(struct omap_ssi_port *omap_port)
+{
+ unsigned int ch;
+
+ for (ch = 0; ch < SSI_MAX_CHANNELS; ch++) {
+ INIT_LIST_HEAD(&omap_port->txqueue[ch]);
+ INIT_LIST_HEAD(&omap_port->rxqueue[ch]);
+ }
+ INIT_LIST_HEAD(&omap_port->brkqueue);
+}
+
+static int __init ssi_get_iomem(struct platform_device *pd,
+ unsigned int num, unsigned long *base, dma_addr_t *phy)
+{
+ struct resource *mem;
+ struct resource *ioarea;
+
+ mem = platform_get_resource(pd, IORESOURCE_MEM, num);
+ if (!mem) {
+ dev_err(&pd->dev, "IO memory region missing (%d)\n", num);
+ return -ENXIO;
+ }
+ ioarea = devm_request_mem_region(&pd->dev, mem->start,
+ (mem->end - mem->start) + 1, dev_name(&pd->dev));
+ if (!ioarea) {
+ dev_err(&pd->dev, "%s IO memory region request failed\n",
+ mem->name);
+ return -ENXIO;
+ }
+ *base = (unsigned long)devm_ioremap(&pd->dev, mem->start,
+ (mem->end - mem->start) + 1);
+ if (!base) {
+ dev_err(&pd->dev, "%s IO remap failed\n", mem->name);
+ return -ENXIO;
+ }
+ if (phy)
+ *phy = mem->start;
+
+ return 0;
+}
+
+static int __init ssi_ports_init(struct hsi_controller *ssi,
+ struct platform_device *pd)
+{
+ struct hsi_port *port;
+ struct omap_ssi_port *omap_port;
+ unsigned int i;
+ int err;
+
+ for (i = 0; i < ssi->num_ports; i++) {
+ port = &ssi->port[i];
+ omap_port = devm_kzalloc(&pd->dev, sizeof(*omap_port),
+ GFP_KERNEL);
+ if (!omap_port)
+ return -ENOMEM;
+ port->async = ssi_async;
+ port->setup = ssi_setup;
+ port->flush = ssi_flush;
+ port->start_tx = ssi_start_tx;
+ port->stop_tx = ssi_stop_tx;
+ port->release = ssi_release;
+ hsi_port_set_drvdata(port, omap_port);
+ /* Get SST base addresses*/
+ err = ssi_get_iomem(pd, ((i * 2) + 2), &omap_port->sst_base,
+ &omap_port->sst_dma);
+ if (err < 0)
+ return err;
+ /* Get SSR base addresses */
+ err = ssi_get_iomem(pd, ((i * 2) + 3), &omap_port->ssr_base,
+ &omap_port->ssr_dma);
+ if (err < 0)
+ return err;
+ err = ssi_port_irq(port, pd);
+ if (err < 0)
+ return err;
+ err = ssi_wake_irq(port, pd);
+ if (err < 0)
+ return err;
+ ssi_queues_init(omap_port);
+ spin_lock_init(&omap_port->lock);
+ spin_lock_init(&omap_port->wk_lock);
+ }
+
+ return 0;
+}
+
+static void ssi_ports_exit(struct hsi_controller *ssi)
+{
+ struct omap_ssi_port *omap_port;
+ unsigned int i;
+
+ for (i = 0; i < ssi->num_ports; i++) {
+ omap_port = hsi_port_drvdata(&ssi->port[i]);
+ WARN_ON(omap_port->wk_refcount != 0);
+ tasklet_kill(&omap_port->wake_tasklet);
+ tasklet_kill(&omap_port->pio_tasklet);
+ }
+}
+
+static int __init ssi_clk_get(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ int err;
+
+ omap_ssi->ick = clk_get(&ssi->device, "ssi_ick");
+ if (IS_ERR(omap_ssi->ick)) {
+ dev_err(&ssi->device, "Interface clock missing\n");
+ return PTR_ERR(omap_ssi->ick);
+ }
+ omap_ssi->fck = clk_get(&ssi->device, "ssi_ssr_fck");
+ if (IS_ERR(omap_ssi->fck)) {
+ dev_err(&ssi->device, "Functional clock missing\n");
+ err = PTR_ERR(omap_ssi->fck);
+ goto out1;
+ }
+
+ return 0;
+out1:
+ clk_put(omap_ssi->ick);
+
+ return err;
+}
+
+static void ssi_clk_put(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ WARN_ON(omap_ssi->ck_refcount != 0);
+
+ clk_put(omap_ssi->ick);
+ clk_put(omap_ssi->fck);
+}
+
+static int __init ssi_add_controller(struct hsi_controller *ssi,
+ struct platform_device *pd)
+{
+ struct omap_ssi_platform_data *omap_ssi_pdata = pd->dev.platform_data;
+ struct omap_ssi_controller *omap_ssi;
+ struct resource *irq;
+ int err;
+
+ omap_ssi = devm_kzalloc(&pd->dev, sizeof(*omap_ssi), GFP_KERNEL);
+ if (!omap_ssi) {
+ dev_err(&pd->dev, "not enough memory for omap ssi\n");
+ return -ENOMEM;
+ }
+ ssi->id = pd->id;
+ ssi->device.parent = &pd->dev;
+ dev_set_name(&ssi->device, "ssi%d", ssi->id);
+ hsi_controller_set_drvdata(ssi, omap_ssi);
+ omap_ssi->dev = &ssi->device;
+ err = ssi_get_iomem(pd, 0, &omap_ssi->sys, NULL);
+ if (err < 0)
+ return err;
+ err = ssi_get_iomem(pd, 1, &omap_ssi->gdd, NULL);
+ if (err < 0)
+ return err;
+ irq = platform_get_resource(pd, IORESOURCE_IRQ, 0);
+ if (!irq) {
+ dev_err(&pd->dev, "GDD IRQ resource missing\n");
+ return -ENXIO;
+ }
+ omap_ssi->gdd_irq = irq->start;
+ tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet,
+ (unsigned long)ssi);
+ err = devm_request_irq(&pd->dev, omap_ssi->gdd_irq, ssi_gdd_isr,
+ IRQF_DISABLED, irq->name, ssi);
+ if (err < 0) {
+ dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)",
+ omap_ssi->gdd_irq, err);
+ return err;
+ }
+ err = ssi_ports_init(ssi, pd);
+ if (err < 0)
+ return err;
+ omap_ssi->get_loss = omap_ssi_pdata->get_dev_context_loss_count;
+ spin_lock_init(&omap_ssi->lock);
+ spin_lock_init(&omap_ssi->ck_lock);
+
+ err = ssi_clk_get(ssi);
+ if (err < 0)
+ return err;
+
+ err = hsi_register_controller(ssi);
+ if (err < 0)
+ ssi_clk_put(ssi);
+
+ return err;
+}
+
+static int __init ssi_hw_init(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+ unsigned int i;
+ u32 val;
+ int err;
+
+ err = ssi_clk_enable(ssi);
+ if (err < 0) {
+ dev_err(&ssi->device, "Failed to enable the clocks %d\n", err);
+ return err;
+ }
+ /* Reseting SSI controller */
+ __raw_writel(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG);
+ val = __raw_readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
+ for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) {
+ msleep(10);
+ val = __raw_readl(omap_ssi->sys + SSI_SYSSTATUS_REG);
+ }
+ if (!(val & SSI_RESETDONE)) {
+ dev_err(&ssi->device, "SSI HW reset failed\n");
+ ssi_clk_disable(ssi);
+ return -EIO;
+ }
+ /* Reseting GDD */
+ __raw_writel(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG);
+ /* Get FCK rate */
+ omap_ssi->fck_rate = (u32)clk_get_rate(omap_ssi->fck) / 1000; /* KHz */
+ dev_dbg(&ssi->device, "SSI fck rate %d KHz\n", omap_ssi->fck_rate);
+ /* Set default PM settings */
+ val = SSI_AUTOIDLE | SSI_SIDLEMODE_SMART | SSI_MIDLEMODE_SMART;
+ __raw_writel(val, omap_ssi->sys + SSI_SYSCONFIG_REG);
+ omap_ssi->sysconfig = val;
+ __raw_writel(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG);
+ omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON;
+ ssi_clk_disable(ssi);
+
+ return 0;
+}
+
+static void ssi_remove_controller(struct hsi_controller *ssi)
+{
+ struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
+
+ ssi_ports_exit(ssi);
+ tasklet_kill(&omap_ssi->gdd_tasklet);
+ ssi_clk_put(ssi);
+ hsi_unregister_controller(ssi);
+}
+
+static int __init ssi_probe(struct platform_device *pd)
+{
+ struct omap_ssi_platform_data *omap_ssi_pdata = pd->dev.platform_data;
+ struct hsi_controller *ssi;
+ int err;
+
+ if (!omap_ssi_pdata) {
+ dev_err(&pd->dev, "No OMAP SSI platform data\n");
+ return -EINVAL;
+ }
+ ssi = hsi_alloc_controller(omap_ssi_pdata->num_ports, GFP_KERNEL);
+ if (!ssi) {
+ dev_err(&pd->dev, "No memory for controller\n");
+ return -ENOMEM;
+ }
+ platform_set_drvdata(pd, ssi);
+ err = ssi_add_controller(ssi, pd);
+ if (err < 0)
+ goto out1;
+ err = ssi_hw_init(ssi);
+ if (err < 0)
+ goto out2;
+#ifdef CONFIG_DEBUG_FS
+ err = ssi_debug_add_ctrl(ssi);
+ if (err < 0)
+ goto out2;
+#endif
+ return err;
+out2:
+ ssi_remove_controller(ssi);
+out1:
+ platform_set_drvdata(pd, NULL);
+ hsi_free_controller(ssi);
+
+ return err;
+}
+
+static int __exit ssi_remove(struct platform_device *pd)
+{
+ struct hsi_controller *ssi = platform_get_drvdata(pd);
+
+#ifdef CONFIG_DEBUG_FS
+ ssi_debug_remove_ctrl(ssi);
+#endif
+ ssi_remove_controller(ssi);
+ platform_set_drvdata(pd, NULL);
+ hsi_free_controller(ssi);
+
+ return 0;
+}
+
+static struct platform_driver ssi_pdriver = {
+ .remove = __exit_p(ssi_remove),
+ .driver = {
+ .name = "omap_ssi",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init omap_ssi_init(void)
+{
+ pr_info("OMAP SSI hw driver loaded\n");
+ return platform_driver_probe(&ssi_pdriver, ssi_probe);
+}
+module_init(omap_ssi_init);
+
+static void __exit omap_ssi_exit(void)
+{
+ platform_driver_unregister(&ssi_pdriver);
+ pr_info("OMAP SSI driver removed\n");
+}
+module_exit(omap_ssi_exit);
+
+MODULE_ALIAS("platform:omap_ssi");
+MODULE_AUTHOR("Carlos Chinea <carlos.chinea@...ia.com>");
+MODULE_DESCRIPTION("Synchronous Serial Interface Driver");
+MODULE_LICENSE("GPL");
--
1.5.6.5
--
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