ath10k: add basic skeleton to support ahb

qca4019 uses ahb instead of pci where it slightly differs in device
enumeration, clock control, reset control, etc. Good thing is that
ahb also uses copy engine for the data transaction. So, the most of
the stuff implemented in pci.c/ce.c are reusable in ahb case too.

Device enumeration in ahb case comes through platform driver/device
model. All resource details like irq, memory map, clocks, etc for
qca4019 can be fetched from of_node of platform device.

Simply flow would look like,

 device tree => platform device (kernel) => platform driver (ath10k)

Device tree entry will have all qca4019 resource details and the same
info will be passed to kernel. Kernel will prepare new platform device
for that entry and expose DT info to of_node in platform device.
Later, ath10k would register platform driver with unique compatible name
and then kernels binds to corresponding compatible entry & calls ath10k
ahb probe functions. From there onwards, ath10k will take control of it
and move forward.

New bool flag CONFIG_ATH10K_AHB is added in Kconfig to conditionally
enable ahb support in ath10k. On enabling this flag, ath10k_pci.ko
will have ahb support. This patch adds only basic skeleton and few
macros to support ahb in the context of qca4019.

Signed-off-by: Raja Mani <rmani@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath10k/ahb.c b/drivers/net/wireless/ath/ath10k/ahb.c
new file mode 100644
index 0000000..129f4f4
--- /dev/null
+++ b/drivers/net/wireless/ath/ath10k/ahb.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2016 Qualcomm Atheros, Inc. All rights reserved.
+ * Copyright (c) 2015 The Linux Foundation. All rights reserved.
+ *
+ * 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/module.h>
+#include "core.h"
+#include "debug.h"
+#include "ahb.h"
+
+static const struct of_device_id ath10k_ahb_of_match[] = {
+	/* TODO: enable this entry once everything in place.
+	 * { .compatible = "qcom,ipq4019-wifi",
+	 *   .data = (void *)ATH10K_HW_QCA4019 },
+	 */
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, ath10k_ahb_of_match);
+
+static int ath10k_ahb_probe(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static int ath10k_ahb_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct platform_driver ath10k_ahb_driver = {
+	.driver         = {
+		.name   = "ath10k_ahb",
+		.of_match_table = ath10k_ahb_of_match,
+	},
+	.probe  = ath10k_ahb_probe,
+	.remove = ath10k_ahb_remove,
+};
+
+int ath10k_ahb_init(void)
+{
+	int ret;
+
+	printk(KERN_ERR "AHB support is still work in progress\n");
+
+	ret = platform_driver_register(&ath10k_ahb_driver);
+	if (ret)
+		printk(KERN_ERR "failed to register ath10k ahb driver: %d\n",
+		       ret);
+	return ret;
+}
+
+void ath10k_ahb_exit(void)
+{
+	platform_driver_unregister(&ath10k_ahb_driver);
+}