Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932340Ab0LNKKh (ORCPT ); Tue, 14 Dec 2010 05:10:37 -0500 Received: from smtp.nokia.com ([147.243.1.48]:51958 "EHLO mgw-sa02.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758974Ab0LNKJG (ORCPT ); Tue, 14 Dec 2010 05:09:06 -0500 From: Carlos Chinea To: linux-kernel@vger.kernel.org Cc: linux-omap@vger.kernel.org Subject: [RFC PATCHv4 2/7] HSI: omap_ssi: Introducing OMAP SSI driver Date: Tue, 14 Dec 2010 12:09:38 +0200 Message-Id: <1292321383-30200-3-git-send-email-carlos.chinea@nokia.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1292321383-30200-1-git-send-email-carlos.chinea@nokia.com> References: <1292321383-30200-1-git-send-email-carlos.chinea@nokia.com> X-Nokia-AV: Clean Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 69703 Lines: 2238 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 --- arch/arm/mach-omap2/ssi.c | 134 +++ arch/arm/plat-omap/include/plat/ssi.h | 204 ++++ drivers/hsi/controllers/omap_ssi.c | 1853 +++++++++++++++++++++++++++++++++ 3 files changed, 2191 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..e822a77 --- /dev/null +++ b/arch/arm/mach-omap2/ssi.c @@ -0,0 +1,134 @@ +/* + * linux/arch/arm/mach-omap2/ssi.c + * + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * + * Contact: Carlos Chinea + * + * 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 +#include +#include +#include +#include +#include +#include + +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 = 68, + .end = 68, + .name = "ssi_p1_mpu_irq1", + .flags = IORESOURCE_IRQ, + }, + [7] = { + .start = 0, + .end = 0, + .name = "ssi_p1_cawake", + .flags = IORESOURCE_IRQ | IORESOURCE_UNSET, + }, +}; + +static struct platform_device ssi_pdev = { + .name = "omap_ssi", + .id = 0, + .num_resources = ARRAY_SIZE(ssi_resources), + .resource = ssi_resources, + .dev = { + .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..eb84c3a --- /dev/null +++ b/arch/arm/plat-omap/include/plat/ssi.h @@ -0,0 +1,204 @@ +/* + * plat/ssi.h + * + * Hardware definitions for SSI. + * + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * + * Contact: Carlos Chinea + * + * 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]; +}; + +#ifdef CONFIG_OMAP_SSI_CONFIG +extern int omap_ssi_config(struct omap_ssi_board_config *ssi_config); +#else +static inline int omap_ssi_config(struct omap_ssi_board_config *ssi_config) +{ + return 0; +} +#endif /* CONFIG_OMAP_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..a82ea0e --- /dev/null +++ b/drivers/hsi/controllers/omap_ssi.c @@ -0,0 +1,1853 @@ +/* + * omap_ssi.c + * + * Implements the OMAP SSI driver. + * + * Copyright (C) 2010 Nokia Corporation. All rights reserved. + * + * Contact: Carlos Chinea + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define SSI_MAX_CHANNELS 8 +#define SSI_MAX_GDD_LCH 8 +#define SSI_BYTES_TO_FRAMES(x) ((((x) - 1) >> 2) + 1) + +/** + * struct ssi_clk_res - Device resource data for the SSI clocks + * @clk: Pointer to the clock + * @nb: Pointer to the clock notifier for clk, if any + */ +struct ssi_clk_res { + struct clk *clk; + struct notifier_block *nb; +}; + +/** + * 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_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 + * @divisor: 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 + * @wk_lock: spin lock to serialize access to the wake lines + * @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 + * @wk_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; + void __iomem *sst_base; + void __iomem *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; +}; + +/** + * 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 + * @loss_count: To follow if we need to restore context or not + * @max_speed: Maximum TX speed (Kb/s) set by the clients. + * @sysconfig: SSI controller saved context + * @gdd_gcr: SSI GDD saved context + * @get_loss: Pointer to omap_pm_get_dev_context_loss_count, if any + * @port: Array of pointers of the ports of the controller + * @dir: Debugfs SSI root directory + */ +struct omap_ssi_controller { + struct device *dev; + void __iomem *sys; + void __iomem *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; + unsigned long fck_rate; + int loss_count; + u32 max_speed; + /* OMAP SSI Controller context */ + u32 sysconfig; + u32 gdd_gcr; + int (*get_loss)(struct device *dev); + struct omap_ssi_port **port; +#ifdef CONFIG_DEBUG_FS + struct dentry *dir; +#endif +}; + +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_for_each_port(struct hsi_controller *ssi, void *data, + int (*fn)(struct omap_ssi_port *p, void *data)) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + unsigned int i = 0; + int err = 0; + + for (i = 0; ((i < ssi->num_ports) && !err); i++) + err = (*fn)(omap_ssi->port[i], data); + + return err; +} + +static int ssi_set_port_mode(struct omap_ssi_port *omap_port, void *data) +{ + 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); + /* OCP barrier */ + *mode = __raw_readl(omap_port->ssr_base + SSI_SSR_MODE_REG); + + return 0; +} + +static inline void ssi_set_mode(struct hsi_controller *ssi, u32 mode) +{ + ssi_for_each_port(ssi, &mode, ssi_set_port_mode); +} + +static int ssi_restore_port_mode(struct omap_ssi_port *omap_port, + void *data __maybe_unused) +{ + u32 mode; + + __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); + /* OCP barrier */ + mode = __raw_readl(omap_port->ssr_base + SSI_SSR_MODE_REG); + + return 0; +} + +static int ssi_restore_divisor(struct omap_ssi_port *omap_port, + void *data __maybe_unused) +{ + __raw_writel(omap_port->sst.divisor, + omap_port->sst_base + SSI_SST_DIVISOR_REG); + + return 0; +} + +static int ssi_restore_port_ctx(struct omap_ssi_port *omap_port, + void *data __maybe_unused) +{ + struct hsi_port *port = to_hsi_port(omap_port->dev); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *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.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 omap_ssi_port *omap_port, + void *data __maybe_unused) +{ + struct hsi_port *port = to_hsi_port(omap_port->dev); + struct hsi_controller *ssi = to_hsi_controller(port->device.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 & TX divisor */ + + __raw_writel(omap_ssi->sysconfig, omap_ssi->sys + SSI_SYSCONFIG_REG); + __raw_writel(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); + + ssi_for_each_port(ssi, NULL, ssi_restore_port_ctx); +mode: + ssi_for_each_port(ssi, NULL, ssi_restore_divisor); + ssi_for_each_port(ssi, 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; + + ssi_set_mode(ssi, SSI_MODE_SLEEP); + + if (omap_ssi->get_loss) + omap_ssi->loss_count = + (*omap_ssi->get_loss)(ssi->device.parent); + + ssi_for_each_port(ssi, 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 __maybe_unused) +{ + struct hsi_controller *ssi = m->private; + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *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 __maybe_unused) +{ + 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); + void __iomem *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, "ID SST\t\t: 0x%08x\n", + __raw_readl(base + SSI_SST_ID_REG)); + 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, "ID SSR\t\t: 0x%08x\n", + __raw_readl(base + SSI_SSR_ID_REG)); + 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 __maybe_unused) +{ + struct hsi_controller *ssi = m->private; + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *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_div_get(void *data, u64 *val) +{ + struct hsi_port *port = data; + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + + ssi_clk_enable(ssi); + *val = __raw_readl(omap_port->sst_base + SSI_SST_DIVISOR_REG); + ssi_clk_disable(ssi); + + return 0; +} + +static int ssi_div_set(void *data, u64 val) +{ + struct hsi_port *port = data; + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + struct hsi_controller *ssi = to_hsi_controller(port->device.parent); + + if (val > 127) + return -EINVAL; + + ssi_clk_enable(ssi); + __raw_writel(val, omap_port->sst_base + SSI_SST_DIVISOR_REG); + omap_port->sst.divisor = val; + 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, +}; + +DEFINE_SIMPLE_ATTRIBUTE(ssi_sst_div_fops, ssi_div_get, ssi_div_set, "%llu\n"); + +static int __init ssi_debug_add_port(struct omap_ssi_port *omap_port, + void *data) +{ + struct hsi_port *port = to_hsi_port(omap_port->dev); + struct dentry *dir = data; + + dir = debugfs_create_dir(dev_name(omap_port->dev), dir); + if (IS_ERR(dir)) + return PTR_ERR(dir); + debugfs_create_file("regs", S_IRUGO, dir, port, &ssi_port_regs_fops); + dir = debugfs_create_dir("sst", dir); + if (IS_ERR(dir)) + return PTR_ERR(dir); + debugfs_create_file("divisor", S_IRUGO | S_IWUSR, dir, port, + &ssi_sst_div_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 = ssi_for_each_port(ssi, 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_PROCEEDING; + + 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); + void __iomem *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)); + + spin_lock_bh(&omap_ssi->lock); + 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); + spin_unlock_bh(&omap_ssi->lock); + __raw_writew(ccr, gdd + SSI_GDD_CCR_REG(lch)); + msg->status = HSI_STATUS_PROCEEDING; + + 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_transfer(struct omap_ssi_port *omap_port, + struct list_head *queue) +{ + struct hsi_msg *msg; + int err = -1; + + spin_lock_bh(&omap_port->lock); + while (err < 0) { + err = ssi_start_transfer(queue); + if (err < 0) { + msg = list_first_entry(queue, struct hsi_msg, link); + msg->status = HSI_STATUS_ERROR; + msg->actual_len = 0; + list_del(&msg->link); + spin_unlock_bh(&omap_port->lock); + msg->complete(msg); + spin_lock_bh(&omap_port->lock); + } + } + spin_unlock_bh(&omap_port->lock); +} + +static u32 ssi_calculate_div(struct hsi_controller *ssi) +{ + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + u32 tx_fckrate = (u32) omap_ssi->fck_rate; + + /* / 2 : SSI TX clock is always half of the SSI functional clock */ + tx_fckrate >>= 1; + /* Round down when tx_fckrate % omap_ssi->max_speed == 0 */ + tx_fckrate--; + dev_dbg(&ssi->device, "TX div %d for fck_rate %lu Khz speed %d Kb/s\n", + tx_fckrate / omap_ssi->max_speed, omap_ssi->fck_rate, + omap_ssi->max_speed); + + return tx_fckrate / omap_ssi->max_speed; +} + +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; + } + spin_lock(&omap_ssi->lock); + /* 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); + spin_unlock(&omap_ssi->lock); + /* Cancel all PIO read transfers */ + spin_lock(&omap_port->lock); + 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)); + /* ACK error */ + __raw_writel(err, omap_port->ssr_base + SSI_SSR_ERRORACK_REG); + __raw_writel(SSI_ERROROCCURED, + omap_ssi->sys + SSI_MPU_STATUS_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; + spin_unlock(&omap_port->lock); + msg->complete(msg); + /* Now restart queued reads if any */ + ssi_transfer(omap_port, &omap_port->rxqueue[i]); + spin_lock(&omap_port->lock); + } + spin_unlock(&omap_port->lock); +} + +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); + __raw_writel(SSI_BREAKDETECTED, + omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); + spin_unlock(&omap_port->lock); + + list_for_each_entry_safe(msg, tmp, &omap_port->brkqueue, link) { + msg->status = HSI_STATUS_COMPLETED; + spin_lock(&omap_port->lock); + list_del(&msg->link); + spin_unlock(&omap_port->lock); + 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_PROCEEDING; + 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 = 0; + + 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); + if (err < 0) { + list_del(&msg->link); + msg->status = HSI_STATUS_ERROR; + } + 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 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); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + void __iomem *sst = omap_port->sst_base; + void __iomem *ssr = omap_port->ssr_base; + u32 div; + u32 val; + int err = 0; + + ssi_clk_enable(ssi); + spin_lock_bh(&omap_port->lock); + if (cl->tx_cfg.speed) + omap_ssi->max_speed = cl->tx_cfg.speed; + div = ssi_calculate_div(ssi); + 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/RX module to sleep to stop TX/RX during cfg update */ + __raw_writel(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG); + __raw_writel(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG); + /* Flush posted write */ + val = __raw_readl(ssr + SSI_SSR_MODE_REG); + /* TX */ + __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); + /* RX */ + __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++) { + if (list_empty(&omap_port->txqueue[i])) + continue; + msg = list_first_entry(&omap_port->txqueue[i], struct hsi_msg, + link); + if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) { + 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); + } + 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); + if ((msg->cl == cl) && (msg->status == HSI_STATUS_PROCEEDING)) { + 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); + struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); + + spin_lock_bh(&omap_port->lock); + ssi_clk_enable(ssi); + /* Stop all the pending DMA requests for that client */ + ssi_cleanup_gdd(ssi, cl); + /* Now cleanup all the queues */ + ssi_cleanup_queues(cl); + ssi_clk_disable(ssi); + /* If it is the last client of the port, do extra checks and cleanup */ + if (port->claimed <= 1) { + /* + * Drop the clock reference for the incoming wake line + * if it is still kept high by the other side. + */ + if (omap_port->wkin_cken) { + ssi_clk_disable(ssi); + omap_port->wkin_cken = 0; + } + ssi_clk_enable(ssi); + /* Stop any SSI TX/RX without a client */ + ssi_set_mode(ssi, SSI_MODE_SLEEP); + omap_port->sst.mode = SSI_MODE_SLEEP; + omap_port->ssr.mode = SSI_MODE_SLEEP; + ssi_clk_disable(ssi); + WARN_ON(omap_port->wk_refcount != 0); + WARN_ON(omap_ssi->ck_refcount != 0); + } + spin_unlock_bh(&omap_port->lock); + + 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; + void __iomem *sst = omap_port->sst_base; + void __iomem *ssr = omap_port->ssr_base; + unsigned int i; + u32 err; + + ssi_clk_enable(ssi); + spin_lock_bh(&omap_port->lock); + /* 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); + 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 reg; + 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->ttype == HSI_MSG_WRITE) + val = SSI_DATAACCEPT(msg->channel); + else + val = SSI_DATAAVAILABLE(msg->channel); + if (msg->status == HSI_STATUS_PROCEEDING) { + 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_PROCEEDING) || + ((msg->status == HSI_STATUS_COMPLETED) && + (msg->ttype == HSI_MSG_WRITE))) { + __raw_writel(val, omap_ssi->sys + + SSI_MPU_STATUS_REG(port->num, 0)); + spin_unlock(&omap_port->lock); + + return; + } + + } + /* Transfer completed at this point */ + reg = __raw_readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + if (msg->ttype == HSI_MSG_WRITE) + ssi_clk_disable(ssi); /* Release clocks for write transfer */ + reg &= ~val; + __raw_writel(reg, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); + __raw_writel(val, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); + list_del(&msg->link); + spin_unlock(&omap_port->lock); + msg->complete(msg); + ssi_transfer(omap_port, queue); +} + +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); + struct omap_ssi_port *omap_port = hsi_port_drvdata(port); + 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 */ + dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", + msg->channel, msg->ttype); + spin_unlock(&omap_ssi->lock); + if (csr & SSI_CSR_TOUR) { /* Timeout error */ + msg->status = HSI_STATUS_ERROR; + msg->actual_len = 0; + spin_lock(&omap_port->lock); + list_del(&msg->link); /* Dequeue msg */ + spin_unlock(&omap_port->lock); + msg->complete(msg); + return; + } + spin_lock(&omap_port->lock); + 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)); + spin_unlock(&omap_port->lock); + + msg->status = HSI_STATUS_COMPLETED; + msg->actual_len = sg_dma_len(msg->sgt.sgl); +} + +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); + void __iomem *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); + void __iomem *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); + + 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 ocurrs. + */ + spin_lock(&omap_port->lock); + if (!omap_port->wkin_cken) { + omap_port->wkin_cken = 1; + ssi_clk_enable(ssi); + } + spin_unlock(&omap_port->lock); + dev_dbg(&ssi->device, "Wake in high\n"); + hsi_event(port, HSI_EVENT_START_RX); + } else { + dev_dbg(&ssi->device, "Wake in low\n"); + hsi_event(port, HSI_EVENT_STOP_RX); + spin_lock(&omap_port->lock); + if (omap_port->wkin_cken) { + ssi_clk_disable(ssi); + omap_port->wkin_cken = 0; + } + spin_unlock(&omap_port->lock); + } +} + +static irqreturn_t ssi_wake_isr(int irq __maybe_unused, 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); + err = enable_irq_wake(omap_port->wake_irq); + if (err < 0) + dev_err(&port->device, "Enable wake on the wakeline 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, void __iomem **pbase, dma_addr_t *phy) +{ + struct resource *mem; + struct resource *ioarea; + void __iomem *base; + + 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, + resource_size(mem), dev_name(&pd->dev)); + if (!ioarea) { + dev_err(&pd->dev, "%s IO memory region request failed\n", + mem->name); + return -ENXIO; + } + base = devm_ioremap(&pd->dev, mem->start, resource_size(mem)); + if (!base) { + dev_err(&pd->dev, "%s IO remap failed\n", mem->name); + return -ENXIO; + } + *pbase = base; + + 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_controller *omap_ssi = hsi_controller_drvdata(ssi); + struct omap_ssi_port *omap_port; + unsigned int i; + int err; + + omap_ssi->port = devm_kzalloc(&pd->dev, + sizeof(omap_port) * ssi->num_ports, GFP_KERNEL); + if (!omap_ssi->port) + return -ENOMEM; + + 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); + omap_port->dev = &port->device; + omap_ssi->port[i] = omap_port; + } + + 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]); + tasklet_kill(&omap_port->wake_tasklet); + tasklet_kill(&omap_port->pio_tasklet); + } +} + +static void ssi_clk_release(struct device *dev __maybe_unused, void *res) +{ + struct ssi_clk_res *r = res; + + clk_put(r->clk); +} + +static struct clk *__init ssi_devm_clk_get(struct device *dev, const char *id) +{ + struct ssi_clk_res *pclk; + struct clk *clk; + + pclk = devres_alloc(ssi_clk_release, sizeof(*pclk), GFP_KERNEL); + if (!pclk) { + dev_err(dev, "Could not allocate the device resource entry\n"); + return ERR_PTR(-ENOMEM); + } + clk = clk_get(dev, id); + if (IS_ERR(clk)) { + dev_err(dev, "clock get %s failed %li\n", id, PTR_ERR(clk)); + devres_free(pclk); + } else { + pclk->clk = clk; + devres_add(dev, pclk); + } + + return clk; +} + +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->owner = THIS_MODULE; + 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; + omap_ssi->max_speed = UINT_MAX; + spin_lock_init(&omap_ssi->lock); + spin_lock_init(&omap_ssi->ck_lock); + omap_ssi->ick = ssi_devm_clk_get(&pd->dev, "ssi_ick"); + if (IS_ERR(omap_ssi->ick)) + return PTR_ERR(omap_ssi->ick); + omap_ssi->fck = ssi_devm_clk_get(&pd->dev, "ssi_ssr_fck"); + if (IS_ERR(omap_ssi->fck)) + return PTR_ERR(omap_ssi->fck); + err = hsi_register_controller(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(20); + 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 = clk_get_rate(omap_ssi->fck) / 1000; /* KHz */ + dev_dbg(&ssi->device, "SSI fck rate %lu 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); + 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 "); +MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); +MODULE_LICENSE("GPL v2"); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/