/* OMAP SSI port driver. * * Copyright (C) 2010 Nokia Corporation. All rights reserved. * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> * * Contact: Carlos Chinea <carlos.chinea@nokia.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/mod_devicetable.h> #include <linux/platform_device.h> #include <linux/dma-mapping.h> #include <linux/pm_runtime.h> #include <linux/delay.h> #include <linux/gpio/consumer.h> #include <linux/pinctrl/consumer.h> #include <linux/debugfs.h> #include "omap_ssi_regs.h" #include "omap_ssi.h" static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused) { return 0; } static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused) { return 0; } static inline unsigned int ssi_wakein(struct hsi_port *port) { struct omap_ssi_port *omap_port = hsi_port_drvdata(port); return gpiod_get_value(omap_port->wake_gpio); } #ifdef CONFIG_DEBUG_FS static void ssi_debug_remove_port(struct hsi_port *port) { struct omap_ssi_port *omap_port = hsi_port_drvdata(port); debugfs_remove_recursive(omap_port->dir); } 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; pm_runtime_get_sync(omap_port->pdev); 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", readl(base + SSI_WAKE_REG(port->num))); seq_printf(m, "MPU_ENABLE_IRQ%d\t: 0x%08x\n", 0, readl(base + SSI_MPU_ENABLE_REG(port->num, 0))); seq_printf(m, "MPU_STATUS_IRQ%d\t: 0x%08x\n", 0, readl(base + SSI_MPU_STATUS_REG(port->num, 0))); /* SST */ base = omap_port->sst_base; seq_puts(m, "\nSST\n===\n"); seq_printf(m, "ID SST\t\t: 0x%08x\n", readl(base + SSI_SST_ID_REG)); seq_printf(m, "MODE\t\t: 0x%08x\n", readl(base + SSI_SST_MODE_REG)); seq_printf(m, "FRAMESIZE\t: 0x%08x\n", readl(base + SSI_SST_FRAMESIZE_REG)); seq_printf(m, "DIVISOR\t\t: 0x%08x\n", readl(base + SSI_SST_DIVISOR_REG)); seq_printf(m, "CHANNELS\t: 0x%08x\n", readl(base + SSI_SST_CHANNELS_REG)); seq_printf(m, "ARBMODE\t\t: 0x%08x\n", readl(base + SSI_SST_ARBMODE_REG)); seq_printf(m, "TXSTATE\t\t: 0x%08x\n", readl(base + SSI_SST_TXSTATE_REG)); seq_printf(m, "BUFSTATE\t: 0x%08x\n", readl(base + SSI_SST_BUFSTATE_REG)); seq_printf(m, "BREAK\t\t: 0x%08x\n", 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, readl(base + SSI_SST_BUFFER_CH_REG(ch))); } /* SSR */ base = omap_port->ssr_base; seq_puts(m, "\nSSR\n===\n"); seq_printf(m, "ID SSR\t\t: 0x%08x\n", readl(base + SSI_SSR_ID_REG)); seq_printf(m, "MODE\t\t: 0x%08x\n", readl(base + SSI_SSR_MODE_REG)); seq_printf(m, "FRAMESIZE\t: 0x%08x\n", readl(base + SSI_SSR_FRAMESIZE_REG)); seq_printf(m, "CHANNELS\t: 0x%08x\n", readl(base + SSI_SSR_CHANNELS_REG)); seq_printf(m, "TIMEOUT\t\t: 0x%08x\n", readl(base + SSI_SSR_TIMEOUT_REG)); seq_printf(m, "RXSTATE\t\t: 0x%08x\n", readl(base + SSI_SSR_RXSTATE_REG)); seq_printf(m, "BUFSTATE\t: 0x%08x\n", readl(base + SSI_SSR_BUFSTATE_REG)); seq_printf(m, "BREAK\t\t: 0x%08x\n", readl(base + SSI_SSR_BREAK_REG)); seq_printf(m, "ERROR\t\t: 0x%08x\n", readl(base + SSI_SSR_ERROR_REG)); seq_printf(m, "ERRORACK\t: 0x%08x\n", 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, readl(base + SSI_SSR_BUFFER_CH_REG(ch))); } pm_runtime_put_autosuspend(omap_port->pdev); return 0; } static int ssi_port_regs_open(struct inode *inode, struct file *file) { return single_open(file, ssi_debug_port_show, inode->i_private); } static const struct file_operations ssi_port_regs_fops = { .open = ssi_port_regs_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int ssi_div_get(void *data, u64 *val) { struct hsi_port *port = data; struct omap_ssi_port *omap_port = hsi_port_drvdata(port); pm_runtime_get_sync(omap_port->pdev); *val = readl(omap_port->sst_base + SSI_SST_DIVISOR_REG); pm_runtime_put_autosuspend(omap_port->pdev); 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); if (val > 127) return -EINVAL; pm_runtime_get_sync(omap_port->pdev); writel(val, omap_port->sst_base + SSI_SST_DIVISOR_REG); omap_port->sst.divisor = val; pm_runtime_put_autosuspend(omap_port->pdev); return 0; } DEFINE_SIMPLE_ATTRIBUTE(ssi_sst_div_fops, ssi_div_get, ssi_div_set, "%llu\n"); static int ssi_debug_add_port(struct omap_ssi_port *omap_port, struct dentry *dir) { struct hsi_port *port = to_hsi_port(omap_port->dev); dir = debugfs_create_dir(dev_name(omap_port->dev), dir); if (!dir) return -ENOMEM; omap_port->dir = dir; debugfs_create_file("regs", S_IRUGO, dir, port, &ssi_port_regs_fops); dir = debugfs_create_dir("sst", dir); if (!dir) return -ENOMEM; debugfs_create_file("divisor", S_IRUGO | S_IWUSR, dir, port, &ssi_sst_div_fops); return 0; } #endif static void ssi_process_errqueue(struct work_struct *work) { struct omap_ssi_port *omap_port; struct list_head *head, *tmp; struct hsi_msg *msg; omap_port = container_of(work, struct omap_ssi_port, errqueue_work.work); list_for_each_safe(head, tmp, &omap_port->errqueue) { msg = list_entry(head, struct hsi_msg, link); msg->complete(msg); list_del(head); } } 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_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; /* Hold clocks during the transfer */ pm_runtime_get(omap_port->pdev); if (!pm_runtime_active(omap_port->pdev)) { dev_warn(&port->device, "ssi_start_dma called without runtime PM!\n"); pm_runtime_put_autosuspend(omap_port->pdev); return -EREMOTEIO; } 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"); pm_runtime_put_autosuspend(omap_port->pdev); 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"); pm_runtime_put_autosuspend(omap_port->pdev); 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); writew_relaxed(csdp, gdd + SSI_GDD_CSDP_REG(lch)); writew_relaxed(SSI_BLOCK_IE | SSI_TOUT_IE, gdd + SSI_GDD_CICR_REG(lch)); writel_relaxed(d_addr, gdd + SSI_GDD_CDSA_REG(lch)); writel_relaxed(s_addr, gdd + SSI_GDD_CSSA_REG(lch)); writew_relaxed(SSI_BYTES_TO_FRAMES(msg->sgt.sgl->length), gdd + SSI_GDD_CEN_REG(lch)); spin_lock_bh(&omap_ssi->lock); tmp = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); tmp |= SSI_GDD_LCH(lch); writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); spin_unlock_bh(&omap_ssi->lock); writew(ccr, gdd + SSI_GDD_CCR_REG(lch)); msg->status = HSI_STATUS_PROCEEDING; return 0; } static int ssi_start_pio(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); u32 val; pm_runtime_get(omap_port->pdev); if (!pm_runtime_active(omap_port->pdev)) { dev_warn(&port->device, "ssi_start_pio called without runtime PM!\n"); pm_runtime_put_autosuspend(omap_port->pdev); return -EREMOTEIO; } if (msg->ttype == HSI_MSG_WRITE) { val = SSI_DATAACCEPT(msg->channel); /* Hold clocks for pio writes */ pm_runtime_get(omap_port->pdev); } else { val = SSI_DATAAVAILABLE(msg->channel) | SSI_ERROROCCURED; } dev_dbg(&port->device, "Single %s transfer\n", msg->ttype ? "write" : "read"); val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); pm_runtime_put_autosuspend(omap_port->pdev); msg->actual_len = 0; 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 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; pm_runtime_get_sync(omap_port->pdev); if (msg->ttype == HSI_MSG_WRITE) { if (omap_port->sst.mode != SSI_MODE_FRAME) { err = -EINVAL; goto out; } 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 = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 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: pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); 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; pm_runtime_get_sync(omap_port->pdev); 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); pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); dev_dbg(&port->device, "msg status %d ttype %d ch %d\n", msg->status, msg->ttype, msg->channel); return err; } 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_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; pm_runtime_get_sync(omap_port->pdev); 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 */ writel_relaxed(SSI_MODE_SLEEP, sst + SSI_SST_MODE_REG); writel_relaxed(SSI_MODE_SLEEP, ssr + SSI_SSR_MODE_REG); /* Flush posted write */ val = readl(ssr + SSI_SSR_MODE_REG); /* TX */ writel_relaxed(31, sst + SSI_SST_FRAMESIZE_REG); writel_relaxed(div, sst + SSI_SST_DIVISOR_REG); writel_relaxed(cl->tx_cfg.num_hw_channels, sst + SSI_SST_CHANNELS_REG); writel_relaxed(cl->tx_cfg.arb_mode, sst + SSI_SST_ARBMODE_REG); writel_relaxed(cl->tx_cfg.mode, sst + SSI_SST_MODE_REG); /* RX */ writel_relaxed(31, ssr + SSI_SSR_FRAMESIZE_REG); writel_relaxed(cl->rx_cfg.num_hw_channels, ssr + SSI_SSR_CHANNELS_REG); writel_relaxed(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); writel_relaxed(cl->rx_cfg.mode, ssr + SSI_SSR_MODE_REG); omap_port->channels = max(cl->rx_cfg.num_hw_channels, cl->tx_cfg.num_hw_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.num_hw_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.num_hw_channels; omap_port->ssr.mode = cl->rx_cfg.mode; out: spin_unlock_bh(&omap_port->lock); pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); return err; } 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; pm_runtime_get_sync(omap_port->pdev); spin_lock_bh(&omap_port->lock); /* stop all ssi communication */ pinctrl_pm_select_idle_state(omap_port->pdev); udelay(1); /* wait for racing frames */ /* 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; writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i)); if (msg->ttype == HSI_MSG_READ) pm_runtime_put_autosuspend(omap_port->pdev); omap_ssi->gdd_trn[i].msg = NULL; } /* Flush all SST buffers */ writel_relaxed(0, sst + SSI_SST_BUFSTATE_REG); writel_relaxed(0, sst + SSI_SST_TXSTATE_REG); /* Flush all SSR buffers */ writel_relaxed(0, ssr + SSI_SSR_RXSTATE_REG); writel_relaxed(0, ssr + SSI_SSR_BUFSTATE_REG); /* Flush all errors */ err = readl(ssr + SSI_SSR_ERROR_REG); writel_relaxed(err, ssr + SSI_SSR_ERRORACK_REG); /* Flush break */ writel_relaxed(0, ssr + SSI_SSR_BREAK_REG); /* Clear interrupts */ writel_relaxed(0, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); writel_relaxed(0xffffff00, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); writel_relaxed(0, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 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])) pm_runtime_put_autosuspend(omap_port->pdev); ssi_flush_queue(&omap_port->txqueue[i], NULL); ssi_flush_queue(&omap_port->rxqueue[i], NULL); } ssi_flush_queue(&omap_port->brkqueue, NULL); /* Resume SSI communication */ pinctrl_pm_select_default_state(omap_port->pdev); spin_unlock_bh(&omap_port->lock); pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); return 0; } static void start_tx_work(struct work_struct *work) { struct omap_ssi_port *omap_port = container_of(work, struct omap_ssi_port, work); 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); pm_runtime_get_sync(omap_port->pdev); /* Grab clocks */ writel(SSI_WAKE(0), omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); } 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); 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; } spin_unlock_bh(&omap_port->wk_lock); schedule_work(&omap_port->work); 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; } writel(SSI_WAKE(0), omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); spin_unlock_bh(&omap_port->wk_lock); pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); /* Release clocks */ return 0; } static void ssi_transfer(struct omap_ssi_port *omap_port, struct list_head *queue) { struct hsi_msg *msg; int err = -1; pm_runtime_get(omap_port->pdev); 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); pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); } 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 */ pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); } 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 = readl(omap_port->sst_base + SSI_SST_BUFSTATE_REG); tmp &= ~txbufstate; writel_relaxed(tmp, omap_port->sst_base + SSI_SST_BUFSTATE_REG); /* Cleanup read buffers */ tmp = readl(omap_port->ssr_base + SSI_SSR_BUFSTATE_REG); tmp &= ~rxbufstate; writel_relaxed(tmp, omap_port->ssr_base + SSI_SSR_BUFSTATE_REG); /* Disarm and ack pending interrupts */ tmp = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); tmp &= ~status; writel_relaxed(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); writel_relaxed(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_port *port = hsi_get_port(cl); struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 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; writew_relaxed(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) { pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); } omap_ssi->gdd_trn[i].msg = NULL; } tmp = readl_relaxed(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); tmp &= ~val; writel_relaxed(tmp, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); writel(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_STATUS_REG); } static int ssi_set_port_mode(struct omap_ssi_port *omap_port, u32 mode) { writel(mode, omap_port->sst_base + SSI_SST_MODE_REG); writel(mode, omap_port->ssr_base + SSI_SSR_MODE_REG); /* OCP barrier */ mode = readl(omap_port->ssr_base + SSI_SSR_MODE_REG); return 0; } 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); pm_runtime_get_sync(omap_port->pdev); spin_lock_bh(&omap_port->lock); /* Stop all the pending DMA requests for that client */ ssi_cleanup_gdd(ssi, cl); /* Now cleanup all the queues */ ssi_cleanup_queues(cl); /* 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 (test_and_clear_bit(SSI_WAKE_EN, &omap_port->flags)) pm_runtime_put_sync(omap_port->pdev); pm_runtime_get(omap_port->pdev); /* Stop any SSI TX/RX without a client */ ssi_set_port_mode(omap_port, SSI_MODE_SLEEP); omap_port->sst.mode = SSI_MODE_SLEEP; omap_port->ssr.mode = SSI_MODE_SLEEP; pm_runtime_put(omap_port->pdev); WARN_ON(omap_port->wk_refcount != 0); } spin_unlock_bh(&omap_port->lock); pm_runtime_put_sync(omap_port->pdev); return 0; } 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 = 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)) { writew_relaxed(0, omap_ssi->gdd + SSI_GDD_CCR_REG(i)); val |= (1 << i); omap_ssi->gdd_trn[i].msg = NULL; } } tmp = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); tmp &= ~val; writel_relaxed(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 = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); tmp &= 0xfeff00ff; /* Disable error & all dataavailable interrupts */ writel_relaxed(tmp, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); /* ACK error */ writel_relaxed(err, omap_port->ssr_base + SSI_SSR_ERRORACK_REG); writel_relaxed(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 = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); val &= ~SSI_BREAKDETECTED; writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); writel_relaxed(0, omap_port->ssr_base + SSI_SSR_BREAK_REG); 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 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_bh(&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) writel(*buf, omap_port->sst_base + SSI_SST_BUFFER_CH_REG(msg->channel)); else *buf = 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))) { writel(val, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); spin_unlock_bh(&omap_port->lock); return; } } /* Transfer completed at this point */ reg = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); if (msg->ttype == HSI_MSG_WRITE) { /* Release clocks for write transfer */ pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); } reg &= ~val; writel_relaxed(reg, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); writel_relaxed(val, omap_ssi->sys + SSI_MPU_STATUS_REG(port->num, 0)); list_del(&msg->link); spin_unlock_bh(&omap_port->lock); msg->complete(msg); ssi_transfer(omap_port, queue); } static irqreturn_t ssi_pio_thread(int irq, void *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; pm_runtime_get_sync(omap_port->pdev); do { status_reg = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); status_reg &= 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 = readl(sys + SSI_MPU_STATUS_REG(port->num, 0)); status_reg &= readl(sys + SSI_MPU_ENABLE_REG(port->num, 0)); /* TODO: sleep if we retry? */ } while (status_reg); pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); return IRQ_HANDLED; } static irqreturn_t ssi_wake_thread(int irq __maybe_unused, void *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); 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. */ if (!test_and_set_bit(SSI_WAKE_EN, &omap_port->flags)) pm_runtime_get_sync(omap_port->pdev); dev_dbg(&ssi->device, "Wake in high\n"); if (omap_port->wktest) { /* FIXME: HACK ! To be removed */ writel(SSI_WAKE(0), omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); } hsi_event(port, HSI_EVENT_START_RX); } else { dev_dbg(&ssi->device, "Wake in low\n"); if (omap_port->wktest) { /* FIXME: HACK ! To be removed */ writel(SSI_WAKE(0), omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); } hsi_event(port, HSI_EVENT_STOP_RX); if (test_and_clear_bit(SSI_WAKE_EN, &omap_port->flags)) { pm_runtime_mark_last_busy(omap_port->pdev); pm_runtime_put_autosuspend(omap_port->pdev); } } return IRQ_HANDLED; } static int ssi_port_irq(struct hsi_port *port, struct platform_device *pd) { struct omap_ssi_port *omap_port = hsi_port_drvdata(port); int err; err = platform_get_irq(pd, 0); if (err < 0) { dev_err(&port->device, "Port IRQ resource missing\n"); return err; } omap_port->irq = err; err = devm_request_threaded_irq(&port->device, omap_port->irq, NULL, ssi_pio_thread, IRQF_ONESHOT, "SSI PORT", port); if (err < 0) dev_err(&port->device, "Request IRQ %d failed (%d)\n", omap_port->irq, err); return err; } static int ssi_wake_irq(struct hsi_port *port, struct platform_device *pd) { struct omap_ssi_port *omap_port = hsi_port_drvdata(port); int cawake_irq; int err; if (!omap_port->wake_gpio) { omap_port->wake_irq = -1; return 0; } cawake_irq = gpiod_to_irq(omap_port->wake_gpio); omap_port->wake_irq = cawake_irq; err = devm_request_threaded_irq(&port->device, cawake_irq, NULL, ssi_wake_thread, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "SSI cawake", port); if (err < 0) dev_err(&port->device, "Request Wake in IRQ %d failed %d\n", cawake_irq, err); err = enable_irq_wake(cawake_irq); if (err < 0) dev_err(&port->device, "Enable wake on the wakeline in irq %d failed %d\n", cawake_irq, err); return err; } static void 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 ssi_port_get_iomem(struct platform_device *pd, const char *name, void __iomem **pbase, dma_addr_t *phy) { struct hsi_port *port = platform_get_drvdata(pd); struct resource *mem; struct resource *ioarea; void __iomem *base; mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); if (!mem) { dev_err(&pd->dev, "IO memory region missing (%s)\n", name); return -ENXIO; } ioarea = devm_request_mem_region(&port->device, 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(&port->device, 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 ssi_port_probe(struct platform_device *pd) { struct device_node *np = pd->dev.of_node; struct hsi_port *port; struct omap_ssi_port *omap_port; struct hsi_controller *ssi = dev_get_drvdata(pd->dev.parent); struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); struct gpio_desc *cawake_gpio = NULL; u32 port_id; int err; dev_dbg(&pd->dev, "init ssi port...\n"); if (!ssi->port || !omap_ssi->port) { dev_err(&pd->dev, "ssi controller not initialized!\n"); err = -ENODEV; goto error; } /* get id of first uninitialized port in controller */ for (port_id = 0; port_id < ssi->num_ports && omap_ssi->port[port_id]; port_id++) ; if (port_id >= ssi->num_ports) { dev_err(&pd->dev, "port id out of range!\n"); err = -ENODEV; goto error; } port = ssi->port[port_id]; if (!np) { dev_err(&pd->dev, "missing device tree data\n"); err = -EINVAL; goto error; } cawake_gpio = devm_gpiod_get(&pd->dev, "ti,ssi-cawake", GPIOD_IN); if (IS_ERR(cawake_gpio)) { err = PTR_ERR(cawake_gpio); dev_err(&pd->dev, "couldn't get cawake gpio (err=%d)!\n", err); goto error; } omap_port = devm_kzalloc(&port->device, sizeof(*omap_port), GFP_KERNEL); if (!omap_port) { err = -ENOMEM; goto error; } omap_port->wake_gpio = cawake_gpio; omap_port->pdev = &pd->dev; omap_port->port_id = port_id; INIT_DEFERRABLE_WORK(&omap_port->errqueue_work, ssi_process_errqueue); INIT_WORK(&omap_port->work, start_tx_work); /* initialize HSI port */ 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); omap_ssi->port[port_id] = omap_port; platform_set_drvdata(pd, port); err = ssi_port_get_iomem(pd, "tx", &omap_port->sst_base, &omap_port->sst_dma); if (err < 0) goto error; err = ssi_port_get_iomem(pd, "rx", &omap_port->ssr_base, &omap_port->ssr_dma); if (err < 0) goto error; err = ssi_port_irq(port, pd); if (err < 0) goto error; err = ssi_wake_irq(port, pd); if (err < 0) goto error; ssi_queues_init(omap_port); spin_lock_init(&omap_port->lock); spin_lock_init(&omap_port->wk_lock); omap_port->dev = &port->device; pm_runtime_use_autosuspend(omap_port->pdev); pm_runtime_set_autosuspend_delay(omap_port->pdev, 250); pm_runtime_enable(omap_port->pdev); #ifdef CONFIG_DEBUG_FS err = ssi_debug_add_port(omap_port, omap_ssi->dir); if (err < 0) { pm_runtime_disable(omap_port->pdev); goto error; } #endif hsi_add_clients_from_dt(port, np); dev_info(&pd->dev, "ssi port %u successfully initialized\n", port_id); return 0; error: return err; } static int ssi_port_remove(struct platform_device *pd) { struct hsi_port *port = platform_get_drvdata(pd); 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); #ifdef CONFIG_DEBUG_FS ssi_debug_remove_port(port); #endif cancel_delayed_work_sync(&omap_port->errqueue_work); hsi_port_unregister_clients(port); port->async = hsi_dummy_msg; port->setup = hsi_dummy_cl; port->flush = hsi_dummy_cl; port->start_tx = hsi_dummy_cl; port->stop_tx = hsi_dummy_cl; port->release = hsi_dummy_cl; omap_ssi->port[omap_port->port_id] = NULL; platform_set_drvdata(pd, NULL); pm_runtime_dont_use_autosuspend(&pd->dev); pm_runtime_disable(&pd->dev); return 0; } static int ssi_restore_divisor(struct omap_ssi_port *omap_port) { writel_relaxed(omap_port->sst.divisor, omap_port->sst_base + SSI_SST_DIVISOR_REG); return 0; } void omap_ssi_port_update_fclk(struct hsi_controller *ssi, struct omap_ssi_port *omap_port) { /* update divisor */ u32 div = ssi_calculate_div(ssi); omap_port->sst.divisor = div; ssi_restore_divisor(omap_port); } #ifdef CONFIG_PM static int ssi_save_port_ctx(struct omap_ssi_port *omap_port) { 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 = readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); return 0; } static int ssi_restore_port_ctx(struct omap_ssi_port *omap_port) { 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; writel_relaxed(omap_port->sys_mpu_enable, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); /* SST context */ base = omap_port->sst_base; writel_relaxed(omap_port->sst.frame_size, base + SSI_SST_FRAMESIZE_REG); writel_relaxed(omap_port->sst.channels, base + SSI_SST_CHANNELS_REG); writel_relaxed(omap_port->sst.arb_mode, base + SSI_SST_ARBMODE_REG); /* SSR context */ base = omap_port->ssr_base; writel_relaxed(omap_port->ssr.frame_size, base + SSI_SSR_FRAMESIZE_REG); writel_relaxed(omap_port->ssr.channels, base + SSI_SSR_CHANNELS_REG); writel_relaxed(omap_port->ssr.timeout, base + SSI_SSR_TIMEOUT_REG); return 0; } static int ssi_restore_port_mode(struct omap_ssi_port *omap_port) { u32 mode; writel_relaxed(omap_port->sst.mode, omap_port->sst_base + SSI_SST_MODE_REG); writel_relaxed(omap_port->ssr.mode, omap_port->ssr_base + SSI_SSR_MODE_REG); /* OCP barrier */ mode = readl(omap_port->ssr_base + SSI_SSR_MODE_REG); return 0; } static int omap_ssi_port_runtime_suspend(struct device *dev) { struct hsi_port *port = dev_get_drvdata(dev); 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(dev, "port runtime suspend!\n"); ssi_set_port_mode(omap_port, SSI_MODE_SLEEP); if (omap_ssi->get_loss) omap_port->loss_count = omap_ssi->get_loss(ssi->device.parent); ssi_save_port_ctx(omap_port); return 0; } static int omap_ssi_port_runtime_resume(struct device *dev) { struct hsi_port *port = dev_get_drvdata(dev); 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(dev, "port runtime resume!\n"); if ((omap_ssi->get_loss) && (omap_port->loss_count == omap_ssi->get_loss(ssi->device.parent))) goto mode; /* We always need to restore the mode & TX divisor */ ssi_restore_port_ctx(omap_port); mode: ssi_restore_divisor(omap_port); ssi_restore_port_mode(omap_port); return 0; } static const struct dev_pm_ops omap_ssi_port_pm_ops = { SET_RUNTIME_PM_OPS(omap_ssi_port_runtime_suspend, omap_ssi_port_runtime_resume, NULL) }; #define DEV_PM_OPS (&omap_ssi_port_pm_ops) #else #define DEV_PM_OPS NULL #endif #ifdef CONFIG_OF static const struct of_device_id omap_ssi_port_of_match[] = { { .compatible = "ti,omap3-ssi-port", }, {}, }; MODULE_DEVICE_TABLE(of, omap_ssi_port_of_match); #else #define omap_ssi_port_of_match NULL #endif struct platform_driver ssi_port_pdriver = { .probe = ssi_port_probe, .remove = ssi_port_remove, .driver = { .name = "omap_ssi_port", .of_match_table = omap_ssi_port_of_match, .pm = DEV_PM_OPS, }, };