--- /dev/null
+/* 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/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/of_gpio.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 gpio_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_sync(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_sync(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_sync(omap_port->pdev);
+
+ return 0;
+}
+
+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,
+ 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 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;
+
+ 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);
+
+ /* Hold clocks during the transfer */
+ pm_runtime_get_sync(omap_port->pdev);
+
+ 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_sync(omap_port->pdev);
+ if (msg->ttype == HSI_MSG_WRITE) {
+ val = SSI_DATAACCEPT(msg->channel);
+ /* Hold clocks for pio writes */
+ pm_runtime_get_sync(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_sync(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_put_sync(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;
+ 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 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_put_sync(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 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_sync(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_sync(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);
+ spin_unlock_bh(&omap_port->lock);
+ pm_runtime_put_sync(omap_port->pdev);
+
+ 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;
+ }
+ pm_runtime_get_sync(omap_port->pdev); /* Grab clocks */
+ 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;
+ }
+ writel(SSI_WAKE(0), omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
+ pm_runtime_put_sync(omap_port->pdev); /* Release clocks */
+ spin_unlock_bh(&omap_port->wk_lock);
+
+ return 0;
+}
+
+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 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_put_sync(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_put_sync(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);
+
+ spin_lock_bh(&omap_port->lock);
+ pm_runtime_get_sync(omap_port->pdev);
+ /* Stop all the pending DMA requests for that client */
+ ssi_cleanup_gdd(ssi, cl);
+ /* Now cleanup all the queues */
+ ssi_cleanup_queues(cl);
+ pm_runtime_put_sync(omap_port->pdev);
+ /* 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) {
+ pm_runtime_put_sync(omap_port->pdev);
+ omap_port->wkin_cken = 0;
+ }
+ pm_runtime_get_sync(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_sync(omap_port->pdev);
+ WARN_ON(omap_port->wk_refcount != 0);
+ }
+ spin_unlock_bh(&omap_port->lock);
+
+ 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(&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(&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_put_sync(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(&omap_port->lock);
+ msg->complete(msg);
+ ssi_transfer(omap_port, queue);
+}
+
+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;
+
+ pm_runtime_get_sync(omap_port->pdev);
+ 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));
+ pm_runtime_put_sync(omap_port->pdev);
+
+ 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);
+ 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.
+ */
+ spin_lock(&omap_port->lock);
+ if (!omap_port->wkin_cken) {
+ omap_port->wkin_cken = 1;
+ pm_runtime_get_sync(omap_port->pdev);
+ }
+ spin_unlock(&omap_port->lock);
+ 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);
+ spin_lock(&omap_port->lock);
+ if (omap_port->wkin_cken) {
+ pm_runtime_put_sync(omap_port->pdev);
+ 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);
+ 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;
+ tasklet_init(&omap_port->pio_tasklet, ssi_pio_tasklet,
+ (unsigned long)port);
+ err = devm_request_irq(&port->device, omap_port->irq, ssi_pio_isr,
+ 0, "mpu_irq0", 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);
+ int cawake_irq;
+ int err;
+
+ if (omap_port->wake_gpio == -1) {
+ omap_port->wake_irq = -1;
+ return 0;
+ }
+
+ cawake_irq = gpio_to_irq(omap_port->wake_gpio);
+
+ omap_port->wake_irq = cawake_irq;
+ tasklet_init(&omap_port->wake_tasklet, ssi_wake_tasklet,
+ (unsigned long)port);
+ err = devm_request_irq(&port->device, cawake_irq, ssi_wake_isr,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ "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 __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_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 __init 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);
+ u32 cawake_gpio = 0;
+ u32 port_id;
+ int err;
+
+ dev_dbg(&pd->dev, "init ssi port...\n");
+
+ if (!try_module_get(ssi->owner)) {
+ dev_err(&pd->dev, "could not increment parent module refcount\n");
+ return -ENODEV;
+ }
+
+ 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 = of_get_named_gpio(np, "ti,ssi-cawake-gpio", 0);
+ if (cawake_gpio < 0) {
+ dev_err(&pd->dev, "DT data is missing cawake gpio (err=%d)\n",
+ cawake_gpio);
+ err = -ENODEV;
+ goto error;
+ }
+
+ err = devm_gpio_request_one(&port->device, cawake_gpio, GPIOF_DIR_IN,
+ "cawake");
+ if (err) {
+ dev_err(&pd->dev, "could not request cawake gpio (err=%d)!\n",
+ err);
+ err = -ENXIO;
+ 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;
+
+ /* 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_irq_safe(omap_port->pdev);
+ 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 (cawake=%d)\n",
+ port_id, cawake_gpio);
+
+ return 0;
+
+error:
+ return err;
+}
+
+static int __exit 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
+
+ hsi_port_unregister_clients(port);
+
+ tasklet_kill(&omap_port->wake_tasklet);
+ tasklet_kill(&omap_port->pio_tasklet);
+
+ 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);
+ module_put(ssi->owner);
+ pm_runtime_disable(&pd->dev);
+
+ return 0;
+}
+
+#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 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;
+}
+
+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
+
+static struct platform_driver ssi_port_pdriver = {
+ .remove = __exit_p(ssi_port_remove),
+ .driver = {
+ .name = "omap_ssi_port",
+ .of_match_table = omap_ssi_port_of_match,
+ .pm = DEV_PM_OPS,
+ },
+};
+
+module_platform_driver_probe(ssi_port_pdriver, ssi_port_probe);
+
+MODULE_ALIAS("platform:omap_ssi_port");
+MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>");
+MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
+MODULE_DESCRIPTION("Synchronous Serial Interface Port Driver");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff