6 files changed, 525 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/wil6210/Makefile b/drivers/net/wireless/ath/wil6210/Makefile
index caa717b..050506f 100644
--- a/drivers/net/wireless/ath/wil6210/Makefile
+++ b/drivers/net/wireless/ath/wil6210/Makefile
@@ -12,6 +12,7 @@ wil6210-y += debug.o
 wil6210-y += rx_reorder.o
 wil6210-y += ioctl.o
 wil6210-y += fw.o
+wil6210-y += pmc.o
 wil6210-$(CONFIG_WIL6210_TRACING) += trace.o
 wil6210-y += wil_platform.o
 wil6210-y += ethtool.o
diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index bbc22d8..19f77e5 100644
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -24,6 +24,7 @@
 #include "wil6210.h"
 #include "wmi.h"
 #include "txrx.h"
+#include "pmc.h"
 
 /* Nasty hack. Better have per device instances */
 static u32 mem_addr;
@@ -702,6 +703,89 @@ static const struct file_operations fops_back = {
 	.open  = simple_open,
 };
 
+/* pmc control, write:
+ * - "alloc <num descriptors> <descriptor_size>" to allocate PMC
+ * - "free" to release memory allocated for PMC
+ */
+static ssize_t wil_write_pmccfg(struct file *file, const char __user *buf,
+				size_t len, loff_t *ppos)
+{
+	struct wil6210_priv *wil = file->private_data;
+	int rc;
+	char *kbuf = kmalloc(len + 1, GFP_KERNEL);
+	char cmd[9];
+	int num_descs, desc_size;
+
+	if (!kbuf)
+		return -ENOMEM;
+
+	rc = simple_write_to_buffer(kbuf, len, ppos, buf, len);
+	if (rc != len) {
+		kfree(kbuf);
+		return rc >= 0 ? -EIO : rc;
+	}
+
+	kbuf[len] = '\0';
+	rc = sscanf(kbuf, "%8s %d %d", cmd, &num_descs, &desc_size);
+	kfree(kbuf);
+
+	if (rc < 0)
+		return rc;
+
+	if (rc < 1) {
+		wil_err(wil, "pmccfg: no params given\n");
+		return -EINVAL;
+	}
+
+	if (0 == strcmp(cmd, "alloc")) {
+		if (rc != 3) {
+			wil_err(wil, "pmccfg: alloc requires 2 params\n");
+			return -EINVAL;
+		}
+		wil_pmc_alloc(wil, num_descs, desc_size);
+	} else if (0 == strcmp(cmd, "free")) {
+		if (rc != 1) {
+			wil_err(wil, "pmccfg: free does not have any params\n");
+			return -EINVAL;
+		}
+		wil_pmc_free(wil, true);
+	} else {
+		wil_err(wil, "pmccfg: Unrecognized command \"%s\"\n", cmd);
+		return -EINVAL;
+	}
+
+	return len;
+}
+
+static ssize_t wil_read_pmccfg(struct file *file, char __user *user_buf,
+			       size_t count, loff_t *ppos)
+{
+	struct wil6210_priv *wil = file->private_data;
+	char text[256];
+	char help[] = "pmc control, write:\n"
+	" - \"alloc <num descriptors> <descriptor_size>\" to allocate pmc\n"
+	" - \"free\" to free memory allocated for pmc\n";
+
+	sprintf(text, "Last command status: %d\n\n%s",
+		wil_pmc_last_cmd_status(wil),
+		help);
+
+	return simple_read_from_buffer(user_buf, count, ppos, text,
+				       strlen(text) + 1);
+}
+
+static const struct file_operations fops_pmccfg = {
+	.read = wil_read_pmccfg,
+	.write = wil_write_pmccfg,
+	.open  = simple_open,
+};
+
+static const struct file_operations fops_pmcdata = {
+	.open		= simple_open,
+	.read		= wil_pmc_read,
+	.llseek		= wil_pmc_llseek,
+};
+
 /*---tx_mgmt---*/
 /* Write mgmt frame to this file to send it */
 static ssize_t wil_write_file_txmgmt(struct file *file, const char __user *buf,
@@ -1363,6 +1447,8 @@ static const struct {
 	{"tx_mgmt",		  S_IWUSR,	&fops_txmgmt},
 	{"wmi_send",		  S_IWUSR,	&fops_wmi},
 	{"back",	S_IRUGO | S_IWUSR,	&fops_back},
+	{"pmccfg",	S_IRUGO | S_IWUSR,	&fops_pmccfg},
+	{"pmcdata",	S_IRUGO,		&fops_pmcdata},
 	{"temp",	S_IRUGO,		&fops_temp},
 	{"freq",	S_IRUGO,		&fops_freq},
 	{"link",	S_IRUGO,		&fops_link},
@@ -1440,6 +1526,8 @@ int wil6210_debugfs_init(struct wil6210_priv *wil)
 	if (IS_ERR_OR_NULL(dbg))
 		return -ENODEV;
 
+	wil_pmc_init(wil);
+
 	wil6210_debugfs_init_files(wil, dbg);
 	wil6210_debugfs_init_isr(wil, dbg);
 	wil6210_debugfs_init_blobs(wil, dbg);
@@ -1459,4 +1547,9 @@ void wil6210_debugfs_remove(struct wil6210_priv *wil)
 {
 	debugfs_remove_recursive(wil->debug);
 	wil->debug = NULL;
+
+	/* free pmc memory without sending command to fw, as it will
+	 * be reset on the way down anyway
+	 */
+	wil_pmc_free(wil, false);
 }
diff --git a/drivers/net/wireless/ath/wil6210/pmc.c b/drivers/net/wireless/ath/wil6210/pmc.c
new file mode 100644
index 0000000..3cb4f35
--- /dev/null
+++ b/drivers/net/wireless/ath/wil6210/pmc.c
@@ -0,0 +1,375 @@
+/*
+ * Copyright (c) 2012-2015 Qualcomm Atheros, Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include "wmi.h"
+#include "wil6210.h"
+#include "txrx.h"
+#include "pmc.h"
+
+struct desc_alloc_info {
+	dma_addr_t pa;
+	void	  *va;
+};
+
+static int wil_is_pmc_allocated(struct pmc_ctx *pmc)
+{
+	return !!pmc->pring_va;
+}
+
+void wil_pmc_init(struct wil6210_priv *wil)
+{
+	memset(&wil->pmc, 0, sizeof(struct pmc_ctx));
+	mutex_init(&wil->pmc.lock);
+}
+
+/**
+ * Allocate the physical ring (p-ring) and the required
+ * number of descriptors of required size.
+ * Initialize the descriptors as required by pmc dma.
+ * The descriptors' buffers dwords are initialized to hold
+ * dword's serial number in the lsw and reserved value
+ * PCM_DATA_INVALID_DW_VAL in the msw.
+ */
+void wil_pmc_alloc(struct wil6210_priv *wil,
+		   int num_descriptors,
+		   int descriptor_size)
+{
+	u32 i;
+	struct pmc_ctx *pmc = &wil->pmc;
+	struct device *dev = wil_to_dev(wil);
+	struct wmi_pmc_cmd pmc_cmd = {0};
+
+	mutex_lock(&pmc->lock);
+
+	if (wil_is_pmc_allocated(pmc)) {
+		/* sanity check */
+		wil_err(wil, "%s: ERROR pmc is already allocated\n", __func__);
+		goto no_release_err;
+	}
+
+	pmc->num_descriptors = num_descriptors;
+	pmc->descriptor_size = descriptor_size;
+
+	wil_dbg_misc(wil, "%s: %d descriptors x %d bytes each\n",
+		     __func__, num_descriptors, descriptor_size);
+
+	/* allocate descriptors info list in pmc context*/
+	pmc->descriptors = kcalloc(num_descriptors,
+				  sizeof(struct desc_alloc_info),
+				  GFP_KERNEL);
+	if (!pmc->descriptors) {
+		wil_err(wil, "%s: ERROR allocating pmc skb list\n", __func__);
+		goto no_release_err;
+	}
+
+	wil_dbg_misc(wil,
+		     "%s: allocated descriptors info list %p\n",
+		     __func__, pmc->descriptors);
+
+	/* Allocate pring buffer and descriptors.
+	 * vring->va should be aligned on its size rounded up to power of 2
+	 * This is granted by the dma_alloc_coherent
+	 */
+	pmc->pring_va = dma_alloc_coherent(dev,
+			sizeof(struct vring_tx_desc) * num_descriptors,
+			&pmc->pring_pa,
+			GFP_KERNEL);
+
+	wil_dbg_misc(wil,
+		     "%s: allocated pring %p. %zd x %d = total %zd bytes\n",
+		     __func__,
+		     (void *)pmc->pring_pa,
+		     sizeof(struct vring_tx_desc),
+		     num_descriptors,
+		     sizeof(struct vring_tx_desc) * num_descriptors);
+
+	if (!pmc->pring_va) {
+		wil_err(wil, "%s: ERROR allocating pmc pring\n", __func__);
+		goto release_pmc_skb_list;
+	}
+
+	/* initially, all descriptors are SW owned
+	 * For Tx, Rx, and PMC, ownership bit is at the same location, thus
+	 * we can use any
+	 */
+	for (i = 0; i < num_descriptors; i++) {
+		struct vring_tx_desc *_d = &pmc->pring_va[i];
+		struct vring_tx_desc dd, *d = &dd;
+		int j = 0;
+
+		pmc->descriptors[i].va = dma_alloc_coherent(dev,
+			descriptor_size,
+			&pmc->descriptors[i].pa,
+			GFP_KERNEL);
+
+		if (unlikely(!pmc->descriptors[i].va)) {
+			wil_err(wil,
+				"%s: ERROR allocating pmc descriptor %d",
+				__func__, i);
+			goto release_pmc_skbs;
+		}
+
+		for (j = 0; j < descriptor_size / sizeof(u32); j++) {
+			u32 *p = (u32 *)pmc->descriptors[i].va + j;
+			*p = PCM_DATA_INVALID_DW_VAL | j;
+		}
+
+		/* configure dma descriptor */
+		d->dma.addr.addr_low =
+			cpu_to_le32(lower_32_bits(pmc->descriptors[i].pa));
+		d->dma.addr.addr_high =
+			cpu_to_le16((u16)upper_32_bits(pmc->descriptors[i].pa));
+		d->dma.status = 0; /* 0 = HW_OWNED */
+		d->dma.length = cpu_to_le16(descriptor_size);
+		d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
+		*_d = *d;
+	}
+
+	wil_dbg_misc(wil, "%s: allocated successfully\n", __func__);
+
+	pmc_cmd.op = WMI_PMC_ALLOCATE;
+	pmc_cmd.ring_size = cpu_to_le16(pmc->num_descriptors);
+	pmc_cmd.mem_base = cpu_to_le64(pmc->pring_pa);
+
+	wil_dbg_misc(wil, "%s: send WMI_PMC_CMD with ALLOCATE op\n", __func__);
+	pmc->last_cmd_status = wmi_send(wil,
+					WMI_PMC_CMDID,
+					&pmc_cmd,
+					sizeof(pmc_cmd));
+	if (pmc->last_cmd_status) {
+		wil_err(wil,
+			"%s: WMI_PMC_CMD with ALLOCATE op failed with status %d",
+			__func__, pmc->last_cmd_status);
+		goto release_pmc_skbs;
+	}
+
+	mutex_unlock(&pmc->lock);
+
+	return;
+
+release_pmc_skbs:
+	wil_err(wil, "%s: exit on error: Releasing skbs...\n", __func__);
+	for (i = 0; pmc->descriptors[i].va && i < num_descriptors; i++) {
+		dma_free_coherent(dev,
+				  descriptor_size,
+				  pmc->descriptors[i].va,
+				  pmc->descriptors[i].pa);
+
+		pmc->descriptors[i].va = NULL;
+	}
+	wil_err(wil, "%s: exit on error: Releasing pring...\n", __func__);
+
+	dma_free_coherent(dev,
+			  sizeof(struct vring_tx_desc) * num_descriptors,
+			  pmc->pring_va,
+			  pmc->pring_pa);
+
+	pmc->pring_va = NULL;
+
+release_pmc_skb_list:
+	wil_err(wil, "%s: exit on error: Releasing descriptors info list...\n",
+		__func__);
+	kfree(pmc->descriptors);
+	pmc->descriptors = NULL;
+
+no_release_err:
+	pmc->last_cmd_status = -ENOMEM;
+	mutex_unlock(&pmc->lock);
+}
+
+/**
+ * Traverse the p-ring and release all buffers.
+ * At the end release the p-ring memory
+ */
+void wil_pmc_free(struct wil6210_priv *wil, int send_pmc_cmd)
+{
+	struct pmc_ctx *pmc = &wil->pmc;
+	struct device *dev = wil_to_dev(wil);
+	struct wmi_pmc_cmd pmc_cmd = {0};
+
+	mutex_lock(&pmc->lock);
+
+	pmc->last_cmd_status = 0;
+
+	if (!wil_is_pmc_allocated(pmc)) {
+		wil_dbg_misc(wil, "%s: Error, can't free - not allocated\n",
+			     __func__);
+		pmc->last_cmd_status = -EPERM;
+		mutex_unlock(&pmc->lock);
+		return;
+	}
+
+	if (send_pmc_cmd) {
+		wil_dbg_misc(wil, "%s: send WMI_PMC_CMD with RELEASE op\n",
+			     __func__);
+		pmc_cmd.op = WMI_PMC_RELEASE;
+		pmc->last_cmd_status =
+				wmi_send(wil, WMI_PMC_CMDID, &pmc_cmd,
+					 sizeof(pmc_cmd));
+		if (pmc->last_cmd_status) {
+			wil_err(wil,
+				"%s WMI_PMC_CMD with RELEASE op failed, status %d",
+				__func__, pmc->last_cmd_status);
+			/* There's nothing we can do with this error.
+			 * Normally, it should never occur.
+			 * Continue to freeing all memory allocated for pmc.
+			 */
+		}
+	}
+
+	if (pmc->pring_va) {
+		size_t buf_size = sizeof(struct vring_tx_desc) *
+				  pmc->num_descriptors;
+
+		wil_dbg_misc(wil, "%s: free pring va %p\n",
+			     __func__, pmc->pring_va);
+		dma_free_coherent(dev, buf_size, pmc->pring_va, pmc->pring_pa);
+
+		pmc->pring_va = NULL;
+	} else {
+		pmc->last_cmd_status = -ENOENT;
+	}
+
+	if (pmc->descriptors) {
+		int i;
+
+		for (i = 0;
+		     pmc->descriptors[i].va && i < pmc->num_descriptors; i++) {
+			dma_free_coherent(dev,
+					  pmc->descriptor_size,
+					  pmc->descriptors[i].va,
+					  pmc->descriptors[i].pa);
+			pmc->descriptors[i].va = NULL;
+		}
+		wil_dbg_misc(wil, "%s: free descriptor info %d/%d\n",
+			     __func__, i, pmc->num_descriptors);
+		wil_dbg_misc(wil,
+			     "%s: free pmc descriptors info list %p\n",
+			     __func__, pmc->descriptors);
+		kfree(pmc->descriptors);
+		pmc->descriptors = NULL;
+	} else {
+		pmc->last_cmd_status = -ENOENT;
+	}
+
+	mutex_unlock(&pmc->lock);
+}
+
+/**
+ * Status of the last operation requested via debugfs: alloc/free/read.
+ * 0 - success or negative errno
+ */
+int wil_pmc_last_cmd_status(struct wil6210_priv *wil)
+{
+	wil_dbg_misc(wil, "%s: status %d\n", __func__,
+		     wil->pmc.last_cmd_status);
+
+	return wil->pmc.last_cmd_status;
+}
+
+/**
+ * Read from required position up to the end of current descriptor,
+ * depends on descriptor size configured during alloc request.
+ */
+ssize_t wil_pmc_read(struct file *filp, char __user *buf, size_t count,
+		     loff_t *f_pos)
+{
+	struct wil6210_priv *wil = filp->private_data;
+	struct pmc_ctx *pmc = &wil->pmc;
+	size_t retval = 0;
+	unsigned long long idx;
+	loff_t offset;
+	size_t pmc_size = pmc->descriptor_size * pmc->num_descriptors;
+
+	mutex_lock(&pmc->lock);
+
+	if (!wil_is_pmc_allocated(pmc)) {
+		wil_err(wil, "%s: error, pmc is not allocated!\n", __func__);
+		pmc->last_cmd_status = -EPERM;
+		mutex_unlock(&pmc->lock);
+		return -EPERM;
+	}
+
+	wil_dbg_misc(wil,
+		     "%s: size %u, pos %lld\n",
+		     __func__, (unsigned)count, *f_pos);
+
+	pmc->last_cmd_status = 0;
+
+	idx = *f_pos;
+	do_div(idx, pmc->descriptor_size);
+	offset = *f_pos - (idx * pmc->descriptor_size);
+
+	if (*f_pos >= pmc_size) {
+		wil_dbg_misc(wil, "%s: reached end of pmc buf: %lld >= %u\n",
+			     __func__, *f_pos, (unsigned)pmc_size);
+		pmc->last_cmd_status = -ERANGE;
+		goto out;
+	}
+
+	wil_dbg_misc(wil,
+		     "%s: read from pos %lld (descriptor %llu, offset %llu) %zu bytes\n",
+		     __func__, *f_pos, idx, offset, count);
+
+	/* if no errors, return the copied byte count */
+	retval = simple_read_from_buffer(buf,
+					 count,
+					 &offset,
+					 pmc->descriptors[idx].va,
+					 pmc->descriptor_size);
+	*f_pos += retval;
+out:
+	mutex_unlock(&pmc->lock);
+
+	return retval;
+}
+
+loff_t wil_pmc_llseek(struct file *filp, loff_t off, int whence)
+{
+	loff_t newpos;
+	struct wil6210_priv *wil = filp->private_data;
+	struct pmc_ctx *pmc = &wil->pmc;
+	size_t pmc_size = pmc->descriptor_size * pmc->num_descriptors;
+
+	switch (whence) {
+	case 0: /* SEEK_SET */
+		newpos = off;
+		break;
+
+	case 1: /* SEEK_CUR */
+		newpos = filp->f_pos + off;
+		break;
+
+	case 2: /* SEEK_END */
+		newpos = pmc_size;
+		break;
+
+	default: /* can't happen */
+		return -EINVAL;
+	}
+
+	if (newpos < 0)
+		return -EINVAL;
+	if (newpos > pmc_size)
+		newpos = pmc_size;
+
+	filp->f_pos = newpos;
+
+	return newpos;
+}
diff --git a/drivers/net/wireless/ath/wil6210/pmc.h b/drivers/net/wireless/ath/wil6210/pmc.h
new file mode 100644
index 0000000..bebc8d5
--- /dev/null
+++ b/drivers/net/wireless/ath/wil6210/pmc.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2012-2015 Qualcomm Atheros, Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/types.h>
+
+#define PCM_DATA_INVALID_DW_VAL (0xB0BA0000)
+
+void wil_pmc_init(struct wil6210_priv *wil);
+void wil_pmc_alloc(struct wil6210_priv *wil,
+		   int num_descriptors, int descriptor_size);
+void wil_pmc_free(struct wil6210_priv *wil, int send_pmc_cmd);
+int wil_pmc_last_cmd_status(struct wil6210_priv *wil);
+ssize_t wil_pmc_read(struct file *, char __user *, size_t, loff_t *);
+loff_t wil_pmc_llseek(struct file *filp, loff_t off, int whence);
diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h
index abb2080..9d74bd8 100644
--- a/drivers/net/wireless/ath/wil6210/wil6210.h
+++ b/drivers/net/wireless/ath/wil6210/wil6210.h
@@ -21,6 +21,7 @@
 #include <linux/wireless.h>
 #include <net/cfg80211.h>
 #include <linux/timex.h>
+#include <linux/types.h>
 #include "wil_platform.h"
 
 extern bool no_fw_recovery;
@@ -527,6 +528,17 @@ struct wil_probe_client_req {
 	u8 cid;
 };
 
+struct pmc_ctx {
+	/* alloc, free, and read operations must own the lock */
+	struct mutex		lock;
+	struct vring_tx_desc	*pring_va;
+	dma_addr_t		pring_pa;
+	struct desc_alloc_info  *descriptors;
+	int			last_cmd_status;
+	int			num_descriptors;
+	int			descriptor_size;
+};
+
 struct wil6210_priv {
 	struct pci_dev *pdev;
 	int n_msi;
@@ -611,6 +623,8 @@ struct wil6210_priv {
 
 	void *platform_handle;
 	struct wil_platform_ops platform_ops;
+
+	struct pmc_ctx pmc;
 };
 
 #define wil_to_wiphy(i) (i->wdev->wiphy)
diff --git a/drivers/net/wireless/ath/wil6210/wmi.h b/drivers/net/wireless/ath/wil6210/wmi.h
index b290553..24c253d 100644
--- a/drivers/net/wireless/ath/wil6210/wmi.h
+++ b/drivers/net/wireless/ath/wil6210/wmi.h
@@ -836,6 +836,21 @@ struct wmi_temp_sense_cmd {
 } __packed;
 
 /*
+ * WMI_PMC_CMDID
+ */
+enum wmi_pmc_op_e {
+	WMI_PMC_ALLOCATE = 0,
+	WMI_PMC_RELEASE = 1,
+};
+
+struct wmi_pmc_cmd {
+	u8 op;		/* enum wmi_pmc_cmd_op_type */
+	u8 reserved;
+	__le16 ring_size;
+	__le64 mem_base;
+} __packed;
+
+/*
  * WMI Events
  */