ath5k: revert AHB bus support removing

This reverts commit 093ec3c5337434f40d77c1af06c139da3e5ba6dc.

AHB bus code has been removed, since we did not have support Atheros
AR231x SoC, required for building the AHB version of ath5k. Now that
support WiSoC chips added we can restore functionality back.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Acked-by: John W. Linville <linville@tuxdriver.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Cc: Nick Kossifidis <mickflemm@gmail.com>
Cc: "Luis R. Rodriguez" <mcgrof@do-not-panic.com>
Cc: linux-wireless@vger.kernel.org
Cc: ath5k-devel@lists.ath5k.org
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8247/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 234 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath5k/ahb.c b/drivers/net/wireless/ath/ath5k/ahb.c
new file mode 100644
index 000000000000..79bffe165cab
--- /dev/null
+++ b/drivers/net/wireless/ath/ath5k/ahb.c
@@ -0,0 +1,234 @@
+/*
+ * Copyright (c) 2008-2009 Atheros Communications Inc.
+ * Copyright (c) 2009 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (c) 2009 Imre Kaloz <kaloz@openwrt.org>
+ *
+ * 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/nl80211.h>
+#include <linux/platform_device.h>
+#include <linux/etherdevice.h>
+#include <linux/export.h>
+#include <ar231x_platform.h>
+#include "ath5k.h"
+#include "debug.h"
+#include "base.h"
+#include "reg.h"
+
+/* return bus cachesize in 4B word units */
+static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz)
+{
+	*csz = L1_CACHE_BYTES >> 2;
+}
+
+static bool
+ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
+{
+	struct ath5k_hw *ah = common->priv;
+	struct platform_device *pdev = to_platform_device(ah->dev);
+	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
+	u16 *eeprom, *eeprom_end;
+
+	eeprom = (u16 *) bcfg->radio;
+	eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
+
+	eeprom += off;
+	if (eeprom > eeprom_end)
+		return false;
+
+	*data = *eeprom;
+	return true;
+}
+
+int ath5k_hw_read_srev(struct ath5k_hw *ah)
+{
+	struct platform_device *pdev = to_platform_device(ah->dev);
+	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
+	ah->ah_mac_srev = bcfg->devid;
+	return 0;
+}
+
+static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
+{
+	struct platform_device *pdev = to_platform_device(ah->dev);
+	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
+	u8 *cfg_mac;
+
+	if (to_platform_device(ah->dev)->id == 0)
+		cfg_mac = bcfg->config->wlan0_mac;
+	else
+		cfg_mac = bcfg->config->wlan1_mac;
+
+	memcpy(mac, cfg_mac, ETH_ALEN);
+	return 0;
+}
+
+static const struct ath_bus_ops ath_ahb_bus_ops = {
+	.ath_bus_type = ATH_AHB,
+	.read_cachesize = ath5k_ahb_read_cachesize,
+	.eeprom_read = ath5k_ahb_eeprom_read,
+	.eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
+};
+
+/*Initialization*/
+static int ath_ahb_probe(struct platform_device *pdev)
+{
+	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
+	struct ath5k_hw *ah;
+	struct ieee80211_hw *hw;
+	struct resource *res;
+	void __iomem *mem;
+	int irq;
+	int ret = 0;
+	u32 reg;
+
+	if (!dev_get_platdata(&pdev->dev)) {
+		dev_err(&pdev->dev, "no platform data specified\n");
+		ret = -EINVAL;
+		goto err_out;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "no memory resource found\n");
+		ret = -ENXIO;
+		goto err_out;
+	}
+
+	mem = ioremap_nocache(res->start, resource_size(res));
+	if (mem == NULL) {
+		dev_err(&pdev->dev, "ioremap failed\n");
+		ret = -ENOMEM;
+		goto err_out;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "no IRQ resource found\n");
+		ret = -ENXIO;
+		goto err_iounmap;
+	}
+
+	irq = res->start;
+
+	hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
+	if (hw == NULL) {
+		dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
+		ret = -ENOMEM;
+		goto err_iounmap;
+	}
+
+	ah = hw->priv;
+	ah->hw = hw;
+	ah->dev = &pdev->dev;
+	ah->iobase = mem;
+	ah->irq = irq;
+	ah->devid = bcfg->devid;
+
+	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
+		/* Enable WMAC AHB arbitration */
+		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+		reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
+		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+
+		/* Enable global WMAC swapping */
+		reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
+		reg |= AR5K_AR2315_BYTESWAP_WMAC;
+		iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
+	} else {
+		/* Enable WMAC DMA access (assuming 5312 or 231x*/
+		/* TODO: check other platforms */
+		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
+		if (to_platform_device(ah->dev)->id == 0)
+			reg |= AR5K_AR5312_ENABLE_WLAN0;
+		else
+			reg |= AR5K_AR5312_ENABLE_WLAN1;
+		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
+
+		/*
+		 * On a dual-band AR5312, the multiband radio is only
+		 * used as pass-through. Disable 2 GHz support in the
+		 * driver for it
+		 */
+		if (to_platform_device(ah->dev)->id == 0 &&
+		    (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
+		     (BD_WLAN1 | BD_WLAN0))
+			ah->ah_capabilities.cap_needs_2GHz_ovr = true;
+		else
+			ah->ah_capabilities.cap_needs_2GHz_ovr = false;
+	}
+
+	ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
+		ret = -ENODEV;
+		goto err_free_hw;
+	}
+
+	platform_set_drvdata(pdev, hw);
+
+	return 0;
+
+ err_free_hw:
+	ieee80211_free_hw(hw);
+ err_iounmap:
+        iounmap(mem);
+ err_out:
+	return ret;
+}
+
+static int ath_ahb_remove(struct platform_device *pdev)
+{
+	struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
+	struct ieee80211_hw *hw = platform_get_drvdata(pdev);
+	struct ath5k_hw *ah;
+	u32 reg;
+
+	if (!hw)
+		return 0;
+
+	ah = hw->priv;
+
+	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
+		/* Disable WMAC AHB arbitration */
+		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+		reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
+		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+	} else {
+		/*Stop DMA access */
+		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
+		if (to_platform_device(ah->dev)->id == 0)
+			reg &= ~AR5K_AR5312_ENABLE_WLAN0;
+		else
+			reg &= ~AR5K_AR5312_ENABLE_WLAN1;
+		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
+	}
+
+	ath5k_deinit_ah(ah);
+	iounmap(ah->iobase);
+	ieee80211_free_hw(hw);
+
+	return 0;
+}
+
+static struct platform_driver ath_ahb_driver = {
+	.probe      = ath_ahb_probe,
+	.remove     = ath_ahb_remove,
+	.driver		= {
+		.name	= "ar231x-wmac",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(ath_ahb_driver);