ath5k: Add AHB bus support.

AHB specific functions are now in ahb.c file. AHB bus is
compiled in when CONFIG_ATHEROS_AR231X is set in kernel.
All other platforms will use PCI bus.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 219 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..707cde149248
--- /dev/null
+++ b/drivers/net/wireless/ath/ath5k/ahb.c
@@ -0,0 +1,219 @@
+/*
+ * 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 <ar231x_platform.h>
+#include "ath5k.h"
+#include "debug.h"
+#include "base.h"
+#include "reg.h"
+#include "debug.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;
+}
+
+bool ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
+{
+        struct ath5k_softc *sc = common->priv;
+        struct platform_device *pdev = to_platform_device(sc->dev);
+        struct ar231x_board_config *bcfg = pdev->dev.platform_data;
+        u16 *eeprom, *eeprom_end;
+
+
+
+        bcfg = pdev->dev.platform_data;
+        eeprom = (u16 *) bcfg->radio;
+        eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
+
+        eeprom += off;
+        if (eeprom > eeprom_end)
+                return -EINVAL;
+
+        *data = *eeprom;
+        return 0;
+}
+
+int ath5k_hw_read_srev(struct ath5k_hw *ah)
+{
+        struct ath5k_softc *sc = ah->ah_sc;
+        struct platform_device *pdev = to_platform_device(sc->dev);
+        struct ar231x_board_config *bcfg = pdev->dev.platform_data;
+        ah->ah_mac_srev = bcfg->devid;
+        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,
+};
+
+/*Initialization*/
+static int ath_ahb_probe(struct platform_device *pdev)
+{
+        struct ar231x_board_config *bcfg = pdev->dev.platform_data;
+        struct ath5k_softc *sc;
+        struct ieee80211_hw *hw;
+        struct resource *res;
+        void __iomem *mem;
+        int irq;
+        int ret = 0;
+        u32 reg;
+
+        if (!pdev->dev.platform_data) {
+                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, res->end - res->start + 1);
+        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_out;
+        }
+
+        irq = res->start;
+
+        hw = ieee80211_alloc_hw(sizeof(struct ath5k_softc), &ath5k_hw_ops);
+        if (hw == NULL) {
+                dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
+                ret = -ENOMEM;
+                goto err_out;
+        }
+
+        sc = hw->priv;
+        sc->hw = hw;
+        sc->dev = &pdev->dev;
+        sc->iobase = mem;
+        sc->irq = irq;
+        sc->devid = bcfg->devid;
+
+        if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
+                /* Enable WMAC AHB arbitration */
+                reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+                reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
+                __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+
+                /* Enable global WMAC swapping */
+                reg = __raw_readl((void __iomem *) AR5K_AR2315_BYTESWAP);
+                reg |= AR5K_AR2315_BYTESWAP_WMAC;
+                __raw_writel(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
+        } else {
+                /* Enable WMAC DMA access (assuming 5312 or 231x*/
+                /* TODO: check other platforms */
+                reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
+                if (to_platform_device(sc->dev)->id == 0)
+                        reg |= AR5K_AR5312_ENABLE_WLAN0;
+                else
+                        reg |= AR5K_AR5312_ENABLE_WLAN1;
+                __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
+        }
+
+        ret = ath5k_init_softc(sc, &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);
+        platform_set_drvdata(pdev, NULL);
+ err_out:
+        return ret;
+}
+
+static int ath_ahb_remove(struct platform_device *pdev)
+{
+        struct ar231x_board_config *bcfg = pdev->dev.platform_data;
+        struct ieee80211_hw *hw = platform_get_drvdata(pdev);
+        struct ath5k_softc *sc;
+        u32 reg;
+
+        if (!hw)
+                return 0;
+
+        sc = hw->priv;
+
+        if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
+                /* Disable WMAC AHB arbitration */
+                reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+                reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
+                __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+        } else {
+                /*Stop DMA access */
+                reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
+                if (to_platform_device(sc->dev)->id == 0)
+                        reg &= ~AR5K_AR5312_ENABLE_WLAN0;
+                else
+                        reg &= ~AR5K_AR5312_ENABLE_WLAN1;
+                __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
+        }
+
+        ath5k_deinit_softc(sc);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver ath_ahb_driver = {
+        .probe      = ath_ahb_probe,
+        .remove     = ath_ahb_remove,
+        .driver         = {
+                .name   = "ar231x-wmac",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init
+ath5k_ahb_init(void)
+{
+        return platform_driver_register(&ath_ahb_driver);
+}
+
+static void __exit
+ath5k_ahb_exit(void)
+{
+        platform_driver_unregister(&ath_ahb_driver);
+}
+
+module_init(ath5k_ahb_init);
+module_exit(ath5k_ahb_exit);