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Date: Mon, 13 May 2013 17:20:36 +0200
From: Oleksij Rempel <linux@...pel-privat.de>
To: Paul Bolle <pebolle@...cali.nl>
CC: Jiri Slaby <jirislaby@...il.com>,
Nick Kossifidis <mickflemm@...il.com>,
"Luis R. Rodriguez" <mcgrof@....qualcomm.com>,
"John W. Linville" <linville@...driver.com>,
Bob Copeland <me@...copeland.com>,
Wojciech Dubowik <Wojciech.Dubowik@...atec.com>,
nbd@...nwrt.org, ath5k-devel@...ts.ath5k.org,
linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ath5k: Remove AHB bus support.
Hmm... i'm working right now to make ar231x device work with upstream
sources. First think is boot loader. There are is a ar231x fork of
redboot, but i decided to go barebox. See:
https://github.com/olerem/barebox/commits/atheros
there one more barebox dev on it, so i think we will get it.
Next step will be to check why ar231x patches are not in upstream
kernel. After i ported ar231x-eth driver to barebox, i can assume why it
is not included - it need some more work. Or may be there are other reasons.
Currently i do not know how AHB bus related to ATHEROS_AR231X.
Am 13.05.2013 17:03, schrieb Paul Bolle:
> AHB bus support was added in v2.6.38, through commit a0b907ee2a ("ath5k:
> Add AHB bus support."). That code can only be build if the Kconfig
> symbol ATHEROS_AR231X is set. But that symbol has never been added to
> the tree. So AHB bus support has always been dead code.
>
> Let's remove all code that depends on ATHEROS_AR231X. If that symbol
> ever gets added to the tree the AHB bus support can be re-added too.
>
> Signed-off-by: Paul Bolle <pebolle@...cali.nl>
> ---
> 0) Compile tested (I do not think I have hardware that use the ath5k
> driver).
>
> 1) I mentioned the missing ATHEROS_AR231X symbol three times before (in
> August 2011, in July 2012 and in March 2103). Nobody stepped forward to
> tell me they were actually working on adding that symbol somehow. So
> let's see how people react when I submit a patch to remove the (dead)
> AHB bus support.
>
> drivers/net/wireless/ath/ath5k/Kconfig | 14 +-
> drivers/net/wireless/ath/ath5k/Makefile | 1 -
> drivers/net/wireless/ath/ath5k/ahb.c | 239 --------------------------------
> drivers/net/wireless/ath/ath5k/ath5k.h | 28 ----
> drivers/net/wireless/ath/ath5k/base.c | 14 --
> drivers/net/wireless/ath/ath5k/led.c | 6 -
> 6 files changed, 3 insertions(+), 299 deletions(-)
> delete mode 100644 drivers/net/wireless/ath/ath5k/ahb.c
>
> diff --git a/drivers/net/wireless/ath/ath5k/Kconfig b/drivers/net/wireless/ath/ath5k/Kconfig
> index c9f81a3..93caf8e68 100644
> --- a/drivers/net/wireless/ath/ath5k/Kconfig
> +++ b/drivers/net/wireless/ath/ath5k/Kconfig
> @@ -1,13 +1,12 @@
> config ATH5K
> tristate "Atheros 5xxx wireless cards support"
> - depends on (PCI || ATHEROS_AR231X) && MAC80211
> + depends on PCI && MAC80211
> select ATH_COMMON
> select MAC80211_LEDS
> select LEDS_CLASS
> select NEW_LEDS
> select AVERAGE
> - select ATH5K_AHB if (ATHEROS_AR231X && !PCI)
> - select ATH5K_PCI if (!ATHEROS_AR231X && PCI)
> + select ATH5K_PCI
> ---help---
> This module adds support for wireless adapters based on
> Atheros 5xxx chipset.
> @@ -52,16 +51,9 @@ config ATH5K_TRACER
>
> If unsure, say N.
>
> -config ATH5K_AHB
> - bool "Atheros 5xxx AHB bus support"
> - depends on (ATHEROS_AR231X && !PCI)
> - ---help---
> - This adds support for WiSoC type chipsets of the 5xxx Atheros
> - family.
> -
> config ATH5K_PCI
> bool "Atheros 5xxx PCI bus support"
> - depends on (!ATHEROS_AR231X && PCI)
> + depends on PCI
> ---help---
> This adds support for PCI type chipsets of the 5xxx Atheros
> family.
> diff --git a/drivers/net/wireless/ath/ath5k/Makefile b/drivers/net/wireless/ath/ath5k/Makefile
> index 1b3a34f..51e2d86 100644
> --- a/drivers/net/wireless/ath/ath5k/Makefile
> +++ b/drivers/net/wireless/ath/ath5k/Makefile
> @@ -17,6 +17,5 @@ ath5k-y += ani.o
> ath5k-y += sysfs.o
> ath5k-y += mac80211-ops.o
> ath5k-$(CONFIG_ATH5K_DEBUG) += debug.o
> -ath5k-$(CONFIG_ATH5K_AHB) += ahb.o
> ath5k-$(CONFIG_ATH5K_PCI) += pci.o
> obj-$(CONFIG_ATH5K) += ath5k.o
> diff --git a/drivers/net/wireless/ath/ath5k/ahb.c b/drivers/net/wireless/ath/ath5k/ahb.c
> deleted file mode 100644
> index 8e8bcc7a..0000000
> --- a/drivers/net/wireless/ath/ath5k/ahb.c
> +++ /dev/null
> @@ -1,239 +0,0 @@
> -/*
> - * Copyright (c) 2008-2009 Atheros Communications Inc.
> - * Copyright (c) 2009 Gabor Juhos <juhosg@...nwrt.org>
> - * Copyright (c) 2009 Imre Kaloz <kaloz@...nwrt.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 = 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 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 = pdev->dev.platform_data;
> - 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 = pdev->dev.platform_data;
> - 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 = pdev->dev.platform_data;
> - struct ath5k_hw *ah;
> - 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, 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);
> - platform_set_drvdata(pdev, NULL);
> - err_iounmap:
> - iounmap(mem);
> - 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_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);
> - platform_set_drvdata(pdev, NULL);
> - 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);
> diff --git a/drivers/net/wireless/ath/ath5k/ath5k.h b/drivers/net/wireless/ath/ath5k/ath5k.h
> index 2d691b8..deaedb8 100644
> --- a/drivers/net/wireless/ath/ath5k/ath5k.h
> +++ b/drivers/net/wireless/ath/ath5k/ath5k.h
> @@ -1645,32 +1645,6 @@ static inline struct ath_regulatory *ath5k_hw_regulatory(struct ath5k_hw *ah)
> return &(ath5k_hw_common(ah)->regulatory);
> }
>
> -#ifdef CONFIG_ATHEROS_AR231X
> -#define AR5K_AR2315_PCI_BASE ((void __iomem *)0xb0100000)
> -
> -static inline void __iomem *ath5k_ahb_reg(struct ath5k_hw *ah, u16 reg)
> -{
> - /* On AR2315 and AR2317 the PCI clock domain registers
> - * are outside of the WMAC register space */
> - if (unlikely((reg >= 0x4000) && (reg < 0x5000) &&
> - (ah->ah_mac_srev >= AR5K_SREV_AR2315_R6)))
> - return AR5K_AR2315_PCI_BASE + reg;
> -
> - return ah->iobase + reg;
> -}
> -
> -static inline u32 ath5k_hw_reg_read(struct ath5k_hw *ah, u16 reg)
> -{
> - return ioread32(ath5k_ahb_reg(ah, reg));
> -}
> -
> -static inline void ath5k_hw_reg_write(struct ath5k_hw *ah, u32 val, u16 reg)
> -{
> - iowrite32(val, ath5k_ahb_reg(ah, reg));
> -}
> -
> -#else
> -
> static inline u32 ath5k_hw_reg_read(struct ath5k_hw *ah, u16 reg)
> {
> return ioread32(ah->iobase + reg);
> @@ -1681,8 +1655,6 @@ static inline void ath5k_hw_reg_write(struct ath5k_hw *ah, u32 val, u16 reg)
> iowrite32(val, ah->iobase + reg);
> }
>
> -#endif
> -
> static inline enum ath_bus_type ath5k_get_bus_type(struct ath5k_hw *ah)
> {
> return ath5k_hw_common(ah)->bus_ops->ath_bus_type;
> diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
> index 9b20d9e..654cc3d 100644
> --- a/drivers/net/wireless/ath/ath5k/base.c
> +++ b/drivers/net/wireless/ath/ath5k/base.c
> @@ -97,15 +97,6 @@ static int ath5k_reset(struct ath5k_hw *ah, struct ieee80211_channel *chan,
>
> /* Known SREVs */
> static const struct ath5k_srev_name srev_names[] = {
> -#ifdef CONFIG_ATHEROS_AR231X
> - { "5312", AR5K_VERSION_MAC, AR5K_SREV_AR5312_R2 },
> - { "5312", AR5K_VERSION_MAC, AR5K_SREV_AR5312_R7 },
> - { "2313", AR5K_VERSION_MAC, AR5K_SREV_AR2313_R8 },
> - { "2315", AR5K_VERSION_MAC, AR5K_SREV_AR2315_R6 },
> - { "2315", AR5K_VERSION_MAC, AR5K_SREV_AR2315_R7 },
> - { "2317", AR5K_VERSION_MAC, AR5K_SREV_AR2317_R1 },
> - { "2317", AR5K_VERSION_MAC, AR5K_SREV_AR2317_R2 },
> -#else
> { "5210", AR5K_VERSION_MAC, AR5K_SREV_AR5210 },
> { "5311", AR5K_VERSION_MAC, AR5K_SREV_AR5311 },
> { "5311A", AR5K_VERSION_MAC, AR5K_SREV_AR5311A },
> @@ -124,7 +115,6 @@ static const struct ath5k_srev_name srev_names[] = {
> { "5418", AR5K_VERSION_MAC, AR5K_SREV_AR5418 },
> { "2425", AR5K_VERSION_MAC, AR5K_SREV_AR2425 },
> { "2417", AR5K_VERSION_MAC, AR5K_SREV_AR2417 },
> -#endif
> { "xxxxx", AR5K_VERSION_MAC, AR5K_SREV_UNKNOWN },
> { "5110", AR5K_VERSION_RAD, AR5K_SREV_RAD_5110 },
> { "5111", AR5K_VERSION_RAD, AR5K_SREV_RAD_5111 },
> @@ -140,10 +130,6 @@ static const struct ath5k_srev_name srev_names[] = {
> { "5413", AR5K_VERSION_RAD, AR5K_SREV_RAD_5413 },
> { "5424", AR5K_VERSION_RAD, AR5K_SREV_RAD_5424 },
> { "5133", AR5K_VERSION_RAD, AR5K_SREV_RAD_5133 },
> -#ifdef CONFIG_ATHEROS_AR231X
> - { "2316", AR5K_VERSION_RAD, AR5K_SREV_RAD_2316 },
> - { "2317", AR5K_VERSION_RAD, AR5K_SREV_RAD_2317 },
> -#endif
> { "xxxxx", AR5K_VERSION_RAD, AR5K_SREV_UNKNOWN },
> };
>
> diff --git a/drivers/net/wireless/ath/ath5k/led.c b/drivers/net/wireless/ath/ath5k/led.c
> index f77ef36..dbf2483 100644
> --- a/drivers/net/wireless/ath/ath5k/led.c
> +++ b/drivers/net/wireless/ath/ath5k/led.c
> @@ -162,20 +162,14 @@ int ath5k_init_leds(struct ath5k_hw *ah)
> {
> int ret = 0;
> struct ieee80211_hw *hw = ah->hw;
> -#ifndef CONFIG_ATHEROS_AR231X
> struct pci_dev *pdev = ah->pdev;
> -#endif
> char name[ATH5K_LED_MAX_NAME_LEN + 1];
> const struct pci_device_id *match;
>
> if (!ah->pdev)
> return 0;
>
> -#ifdef CONFIG_ATHEROS_AR231X
> - match = NULL;
> -#else
> match = pci_match_id(&ath5k_led_devices[0], pdev);
> -#endif
> if (match) {
> __set_bit(ATH_STAT_LEDSOFT, ah->status);
> ah->led_pin = ATH_PIN(match->driver_data);
>
--
Regards,
Oleksij
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