[deliverable/linux.git] / drivers / net / wireless / ath / wil6210 / pcie_bus.c

/*
 * Copyright (c) 2012 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/module.h>
#include <linux/debugfs.h>
#include <linux/pci.h>
#include <linux/moduleparam.h>

#include "wil6210.h"

static int use_msi = 1;
module_param(use_msi, int, S_IRUGO);
MODULE_PARM_DESC(use_msi,
		 " Use MSI interrupt: "
		 "0 - don't, 1 - (default) - single, or 3");

/* Bus ops */
static int wil_if_pcie_enable(struct wil6210_priv *wil)
{
	struct pci_dev *pdev = wil->pdev;
	int rc;

	pci_set_master(pdev);

	/*
	 * how many MSI interrupts to request?
	 */
	switch (use_msi) {
	case 3:
	case 1:
		wil_dbg_misc(wil, "Setup %d MSI interrupts\n", use_msi);
		break;
	case 0:
		wil_dbg_misc(wil, "MSI interrupts disabled, use INTx\n");
		break;
	default:
		wil_err(wil, "Invalid use_msi=%d, default to 1\n", use_msi);
		use_msi = 1;
	}

	if (use_msi == 3 && pci_enable_msi_range(pdev, 3, 3) < 0) {
		wil_err(wil, "3 MSI mode failed, try 1 MSI\n");
		use_msi = 1;
	}

	if (use_msi == 1 && pci_enable_msi(pdev)) {
		wil_err(wil, "pci_enable_msi failed, use INTx\n");
		use_msi = 0;
	}

	wil->n_msi = use_msi;

	rc = wil6210_init_irq(wil, pdev->irq);
	if (rc)
		goto stop_master;

	/* need reset here to obtain MAC */
	mutex_lock(&wil->mutex);
	rc = wil_reset(wil);
	mutex_unlock(&wil->mutex);
	if (rc)
		goto release_irq;

	return 0;

 release_irq:
	wil6210_fini_irq(wil, pdev->irq);
	/* safe to call if no MSI */
	pci_disable_msi(pdev);
 stop_master:
	pci_clear_master(pdev);
	return rc;
}

static int wil_if_pcie_disable(struct wil6210_priv *wil)
{
	struct pci_dev *pdev = wil->pdev;

	pci_clear_master(pdev);
	/* disable and release IRQ */
	wil6210_fini_irq(wil, pdev->irq);
	/* safe to call if no MSI */
	pci_disable_msi(pdev);
	/* TODO: disable HW */

	return 0;
}

static int wil_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct wil6210_priv *wil;
	struct device *dev = &pdev->dev;
	void __iomem *csr;
	int rc;

	/* check HW */
	dev_info(&pdev->dev, WIL_NAME " device found [%04x:%04x] (rev %x)\n",
		 (int)pdev->vendor, (int)pdev->device, (int)pdev->revision);

	if (pci_resource_len(pdev, 0) != WIL6210_MEM_SIZE) {
		dev_err(&pdev->dev, "Not " WIL_NAME "? "
			"BAR0 size is %lu while expecting %lu\n",
			(ulong)pci_resource_len(pdev, 0), WIL6210_MEM_SIZE);
		return -ENODEV;
	}

	rc = pci_enable_device(pdev);
	if (rc) {
		dev_err(&pdev->dev, "pci_enable_device failed\n");
		return -ENODEV;
	}
	/* rollback to err_disable_pdev */

	rc = pci_request_region(pdev, 0, WIL_NAME);
	if (rc) {
		dev_err(&pdev->dev, "pci_request_region failed\n");
		goto err_disable_pdev;
	}
	/* rollback to err_release_reg */

	csr = pci_ioremap_bar(pdev, 0);
	if (!csr) {
		dev_err(&pdev->dev, "pci_ioremap_bar failed\n");
		rc = -ENODEV;
		goto err_release_reg;
	}
	/* rollback to err_iounmap */
	dev_info(&pdev->dev, "CSR at %pR -> %p\n", &pdev->resource[0], csr);

	wil = wil_if_alloc(dev, csr);
	if (IS_ERR(wil)) {
		rc = (int)PTR_ERR(wil);
		dev_err(dev, "wil_if_alloc failed: %d\n", rc);
		goto err_iounmap;
	}
	/* rollback to if_free */

	pci_set_drvdata(pdev, wil);
	wil->pdev = pdev;

	wil6210_clear_irq(wil);
	/* FW should raise IRQ when ready */
	rc = wil_if_pcie_enable(wil);
	if (rc) {
		wil_err(wil, "Enable device failed\n");
		goto if_free;
	}
	/* rollback to bus_disable */

	rc = wil_if_add(wil);
	if (rc) {
		wil_err(wil, "wil_if_add failed: %d\n", rc);
		goto bus_disable;
	}

	wil6210_debugfs_init(wil);

	/* check FW is alive */
	wmi_echo(wil);

	return 0;

 bus_disable:
	wil_if_pcie_disable(wil);
 if_free:
	wil_if_free(wil);
 err_iounmap:
	pci_iounmap(pdev, csr);
 err_release_reg:
	pci_release_region(pdev, 0);
 err_disable_pdev:
	pci_disable_device(pdev);

	return rc;
}

static void wil_pcie_remove(struct pci_dev *pdev)
{
	struct wil6210_priv *wil = pci_get_drvdata(pdev);

	wil6210_debugfs_remove(wil);
	wil_if_pcie_disable(wil);
	wil_if_remove(wil);
	wil_if_free(wil);
	pci_iounmap(pdev, wil->csr);
	pci_release_region(pdev, 0);
	pci_disable_device(pdev);
}

static DEFINE_PCI_DEVICE_TABLE(wil6210_pcie_ids) = {
	{ PCI_DEVICE(0x1ae9, 0x0301) },
	{ /* end: all zeroes */	},
};
MODULE_DEVICE_TABLE(pci, wil6210_pcie_ids);

static struct pci_driver wil6210_driver = {
	.probe		= wil_pcie_probe,
	.remove		= wil_pcie_remove,
	.id_table	= wil6210_pcie_ids,
	.name		= WIL_NAME,
};

module_pci_driver(wil6210_driver);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Qualcomm Atheros <wil6210@qca.qualcomm.com>");
MODULE_DESCRIPTION("Driver for 60g WiFi WIL6210 card");
Commit	Line	Data
2be7d22f VK	1	/*
	2	* Copyright (c) 2012 Qualcomm Atheros, Inc.
	3	*
	4	* Permission to use, copy, modify, and/or distribute this software for any
	5	* purpose with or without fee is hereby granted, provided that the above
	6	* copyright notice and this permission notice appear in all copies.
	7	*
	8	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	9	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	10	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	11	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	12	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	13	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	14	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	15	*/
	16
2be7d22f	17	#include <linux/module.h>
2be7d22f VK	18	#include <linux/debugfs.h>
	19	#include <linux/pci.h>
	20	#include <linux/moduleparam.h>
	21
	22	#include "wil6210.h"
	23
	24	static int use_msi = 1;
	25	module_param(use_msi, int, S_IRUGO);
	26	MODULE_PARM_DESC(use_msi,
	27	" Use MSI interrupt: "
	28	"0 - don't, 1 - (default) - single, or 3");
	29
	30	/* Bus ops */
	31	static int wil_if_pcie_enable(struct wil6210_priv *wil)
	32	{
	33	struct pci_dev *pdev = wil->pdev;
	34	int rc;
	35
	36	pci_set_master(pdev);
	37
	38	/*
	39	* how many MSI interrupts to request?
	40	*/
	41	switch (use_msi) {
	42	case 3:
	43	case 1:
b4b39061 AG	44	wil_dbg_misc(wil, "Setup %d MSI interrupts\n", use_msi);
b4b39061 AG	45	break;
2be7d22f	46	case 0:
b4b39061	47	wil_dbg_misc(wil, "MSI interrupts disabled, use INTx\n");
2be7d22f VK	48	break;
2be7d22f VK	49	default:
b4b39061	50	wil_err(wil, "Invalid use_msi=%d, default to 1\n", use_msi);
2be7d22f VK	51	use_msi = 1;
2be7d22f VK	52	}
b4b39061 AG	53
	54	if (use_msi == 3 && pci_enable_msi_range(pdev, 3, 3) < 0) {
	55	wil_err(wil, "3 MSI mode failed, try 1 MSI\n");
	56	use_msi = 1;
	57	}
	58
	59	if (use_msi == 1 && pci_enable_msi(pdev)) {
	60	wil_err(wil, "pci_enable_msi failed, use INTx\n");
	61	use_msi = 0;
2be7d22f VK	62	}
2be7d22f VK	63
b4b39061 AG	64	wil->n_msi = use_msi;
b4b39061 AG	65
2be7d22f VK	66	rc = wil6210_init_irq(wil, pdev->irq);
	67	if (rc)
	68	goto stop_master;
	69
	70	/* need reset here to obtain MAC */
097638a0	71	mutex_lock(&wil->mutex);
2be7d22f	72	rc = wil_reset(wil);
097638a0	73	mutex_unlock(&wil->mutex);
2be7d22f VK	74	if (rc)
	75	goto release_irq;
	76
	77	return 0;
	78
	79	release_irq:
	80	wil6210_fini_irq(wil, pdev->irq);
	81	/* safe to call if no MSI */
	82	pci_disable_msi(pdev);
	83	stop_master:
	84	pci_clear_master(pdev);
	85	return rc;
	86	}
	87
	88	static int wil_if_pcie_disable(struct wil6210_priv *wil)
	89	{
	90	struct pci_dev *pdev = wil->pdev;
	91
	92	pci_clear_master(pdev);
	93	/* disable and release IRQ */
	94	wil6210_fini_irq(wil, pdev->irq);
	95	/* safe to call if no MSI */
	96	pci_disable_msi(pdev);
	97	/* TODO: disable HW */
	98
	99	return 0;
	100	}
	101
	102	static int wil_pcie_probe(struct pci_dev pdev, const struct pci_device_id id)
	103	{
	104	struct wil6210_priv *wil;
	105	struct device *dev = &pdev->dev;
	106	void __iomem *csr;
	107	int rc;
	108
	109	/* check HW */
	110	dev_info(&pdev->dev, WIL_NAME " device found [%04x:%04x] (rev %x)\n",
	111	(int)pdev->vendor, (int)pdev->device, (int)pdev->revision);
	112
	113	if (pci_resource_len(pdev, 0) != WIL6210_MEM_SIZE) {
	114	dev_err(&pdev->dev, "Not " WIL_NAME "? "
	115	"BAR0 size is %lu while expecting %lu\n",
	116	(ulong)pci_resource_len(pdev, 0), WIL6210_MEM_SIZE);
	117	return -ENODEV;
	118	}
	119
	120	rc = pci_enable_device(pdev);
	121	if (rc) {
	122	dev_err(&pdev->dev, "pci_enable_device failed\n");
	123	return -ENODEV;
	124	}
	125	/* rollback to err_disable_pdev */
	126
	127	rc = pci_request_region(pdev, 0, WIL_NAME);
	128	if (rc) {
	129	dev_err(&pdev->dev, "pci_request_region failed\n");
	130	goto err_disable_pdev;
	131	}
	132	/* rollback to err_release_reg */
	133
	134	csr = pci_ioremap_bar(pdev, 0);
	135	if (!csr) {
	136	dev_err(&pdev->dev, "pci_ioremap_bar failed\n");
	137	rc = -ENODEV;
138	goto err_release_reg;
139	}
140	/* rollback to err_iounmap */
141	dev_info(&pdev->dev, "CSR at %pR -> %p\n", &pdev->resource[0], csr);
142
143	wil = wil_if_alloc(dev, csr);
144	if (IS_ERR(wil)) {
145	rc = (int)PTR_ERR(wil);
146	dev_err(dev, "wil_if_alloc failed: %d\n", rc);
147	goto err_iounmap;
148	}
149	/* rollback to if_free */
150
151	pci_set_drvdata(pdev, wil);
152	wil->pdev = pdev;
153
f4b5a803	154	wil6210_clear_irq(wil);
2be7d22f VK	155	/* FW should raise IRQ when ready */
	156	rc = wil_if_pcie_enable(wil);
	157	if (rc) {
	158	wil_err(wil, "Enable device failed\n");
	159	goto if_free;
	160	}
	161	/* rollback to bus_disable */
	162
	163	rc = wil_if_add(wil);
	164	if (rc) {
	165	wil_err(wil, "wil_if_add failed: %d\n", rc);
	166	goto bus_disable;
	167	}
	168
	169	wil6210_debugfs_init(wil);
	170
	171	/* check FW is alive */
	172	wmi_echo(wil);
	173
	174	return 0;
	175
	176	bus_disable:
	177	wil_if_pcie_disable(wil);
	178	if_free:
	179	wil_if_free(wil);
	180	err_iounmap:
	181	pci_iounmap(pdev, csr);
	182	err_release_reg:
	183	pci_release_region(pdev, 0);
	184	err_disable_pdev:
	185	pci_disable_device(pdev);
	186
	187	return rc;
	188	}
	189
	190	static void wil_pcie_remove(struct pci_dev *pdev)
	191	{
	192	struct wil6210_priv *wil = pci_get_drvdata(pdev);
	193
	194	wil6210_debugfs_remove(wil);
	195	wil_if_pcie_disable(wil);
	196	wil_if_remove(wil);
	197	wil_if_free(wil);
	198	pci_iounmap(pdev, wil->csr);
	199	pci_release_region(pdev, 0);
	200	pci_disable_device(pdev);
2be7d22f VK	201	}
	202
	203	static DEFINE_PCI_DEVICE_TABLE(wil6210_pcie_ids) = {
	204	{ PCI_DEVICE(0x1ae9, 0x0301) },
	205	{ /* end: all zeroes */ },
	206	};
	207	MODULE_DEVICE_TABLE(pci, wil6210_pcie_ids);
	208
	209	static struct pci_driver wil6210_driver = {
	210	.probe = wil_pcie_probe,
	211	.remove = wil_pcie_remove,
	212	.id_table = wil6210_pcie_ids,
	213	.name = WIL_NAME,
	214	};
	215
	216	module_pci_driver(wil6210_driver);
	217
	218	MODULE_LICENSE("Dual BSD/GPL");
	219	MODULE_AUTHOR("Qualcomm Atheros <wil6210@qca.qualcomm.com>");
	220	MODULE_DESCRIPTION("Driver for 60g WiFi WIL6210 card");