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ath10k: add reset ctrl related functions in ahb 

To perform reset on qca4019 wifi, multiple reset lines needs
to be toggled in a sequence with help of reset controller support
in the kernel. This patch adds functions to reset control init/deinit
and release reset.

Signed-off-by: Raja Mani <rmani@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Raja Mani 2016-01-27 15:24:29 +05:30 committed by Kalle Valo
parent 8beff219c5
commit 14854bfd9d
3 changed files with 145 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/ath/ath10k/Kconfig
View File

@ -17,7 +17,7 @@ config ATH10K_PCI
config ATH10K_AHB
bool "Atheros ath10k AHB support"
depends on ATH10K_PCI && OF
depends on ATH10K_PCI && OF && RESET_CONTROLLER
---help---
This module adds support for AHB bus

138
drivers/net/wireless/ath/ath10k/ahb.c
View File

@ -16,6 +16,7 @@
*/
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/reset.h>
#include "core.h"
#include "debug.h"
#include "pci.h"
@ -207,6 +208,143 @@ static void ath10k_ahb_clock_disable(struct ath10k *ar)
clk_disable_unprepare(ar_ahb->rtc_clk);
}
static int ath10k_ahb_rst_ctrl_init(struct ath10k *ar)
{
struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
struct device *dev;
int ret;
dev = &ar_ahb->pdev->dev;
ar_ahb->core_cold_rst = reset_control_get(dev, "wifi_core_cold");
if (IS_ERR_OR_NULL(ar_ahb->core_cold_rst)) {
ath10k_err(ar, "failed to get core cold rst ctrl: %ld\n",
PTR_ERR(ar_ahb->core_cold_rst));
ret = ar_ahb->core_cold_rst ?
PTR_ERR(ar_ahb->core_cold_rst) : -ENODEV;
goto out;
}
ar_ahb->radio_cold_rst = reset_control_get(dev, "wifi_radio_cold");
if (IS_ERR_OR_NULL(ar_ahb->radio_cold_rst)) {
ath10k_err(ar, "failed to get radio cold rst ctrl: %ld\n",
PTR_ERR(ar_ahb->radio_cold_rst));
ret = ar_ahb->radio_cold_rst ?
PTR_ERR(ar_ahb->radio_cold_rst) : -ENODEV;
goto err_core_cold_rst_put;
}
ar_ahb->radio_warm_rst = reset_control_get(dev, "wifi_radio_warm");
if (IS_ERR_OR_NULL(ar_ahb->radio_warm_rst)) {
ath10k_err(ar, "failed to get radio warm rst ctrl: %ld\n",
PTR_ERR(ar_ahb->radio_warm_rst));
ret = ar_ahb->radio_warm_rst ?
PTR_ERR(ar_ahb->radio_warm_rst) : -ENODEV;
goto err_radio_cold_rst_put;
}
ar_ahb->radio_srif_rst = reset_control_get(dev, "wifi_radio_srif");
if (IS_ERR_OR_NULL(ar_ahb->radio_srif_rst)) {
ath10k_err(ar, "failed to get radio srif rst ctrl: %ld\n",
PTR_ERR(ar_ahb->radio_srif_rst));
ret = ar_ahb->radio_srif_rst ?
PTR_ERR(ar_ahb->radio_srif_rst) : -ENODEV;
goto err_radio_warm_rst_put;
}
ar_ahb->cpu_init_rst = reset_control_get(dev, "wifi_cpu_init");
if (IS_ERR_OR_NULL(ar_ahb->cpu_init_rst)) {
ath10k_err(ar, "failed to get cpu init rst ctrl: %ld\n",
PTR_ERR(ar_ahb->cpu_init_rst));
ret = ar_ahb->cpu_init_rst ?
PTR_ERR(ar_ahb->cpu_init_rst) : -ENODEV;
goto err_radio_srif_rst_put;
}
return 0;
err_radio_srif_rst_put:
reset_control_put(ar_ahb->radio_srif_rst);
err_radio_warm_rst_put:
reset_control_put(ar_ahb->radio_warm_rst);
err_radio_cold_rst_put:
reset_control_put(ar_ahb->radio_cold_rst);
err_core_cold_rst_put:
reset_control_put(ar_ahb->core_cold_rst);
out:
return ret;
}
static void ath10k_ahb_rst_ctrl_deinit(struct ath10k *ar)
{
struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
if (!IS_ERR_OR_NULL(ar_ahb->core_cold_rst))
reset_control_put(ar_ahb->core_cold_rst);
if (!IS_ERR_OR_NULL(ar_ahb->radio_cold_rst))
reset_control_put(ar_ahb->radio_cold_rst);
if (!IS_ERR_OR_NULL(ar_ahb->radio_warm_rst))
reset_control_put(ar_ahb->radio_warm_rst);
if (!IS_ERR_OR_NULL(ar_ahb->radio_srif_rst))
reset_control_put(ar_ahb->radio_srif_rst);
if (!IS_ERR_OR_NULL(ar_ahb->cpu_init_rst))
reset_control_put(ar_ahb->cpu_init_rst);
ar_ahb->core_cold_rst = NULL;
ar_ahb->radio_cold_rst = NULL;
ar_ahb->radio_warm_rst = NULL;
ar_ahb->radio_srif_rst = NULL;
ar_ahb->cpu_init_rst = NULL;
}
static int ath10k_ahb_release_reset(struct ath10k *ar)
{
struct ath10k_ahb *ar_ahb = ath10k_ahb_priv(ar);
int ret;
if (IS_ERR_OR_NULL(ar_ahb->radio_cold_rst) ||
IS_ERR_OR_NULL(ar_ahb->radio_warm_rst) ||
IS_ERR_OR_NULL(ar_ahb->radio_srif_rst) ||
IS_ERR_OR_NULL(ar_ahb->cpu_init_rst)) {
ath10k_err(ar, "rst ctrl(s) is/are not initialized\n");
return -EINVAL;
}
ret = reset_control_deassert(ar_ahb->radio_cold_rst);
if (ret) {
ath10k_err(ar, "failed to deassert radio cold rst: %d\n", ret);
return ret;
}
ret = reset_control_deassert(ar_ahb->radio_warm_rst);
if (ret) {
ath10k_err(ar, "failed to deassert radio warm rst: %d\n", ret);
return ret;
}
ret = reset_control_deassert(ar_ahb->radio_srif_rst);
if (ret) {
ath10k_err(ar, "failed to deassert radio srif rst: %d\n", ret);
return ret;
}
ret = reset_control_deassert(ar_ahb->cpu_init_rst);
if (ret) {
ath10k_err(ar, "failed to deassert cpu init rst: %d\n", ret);
return ret;
}
return 0;
}
static int ath10k_ahb_probe(struct platform_device *pdev)
{
return 0;

6
drivers/net/wireless/ath/ath10k/ahb.h
View File

@ -29,6 +29,12 @@ struct ath10k_ahb {
struct clk *cmd_clk;
struct clk *ref_clk;
struct clk *rtc_clk;
struct reset_control *core_cold_rst;
struct reset_control *radio_cold_rst;
struct reset_control *radio_warm_rst;
struct reset_control *radio_srif_rst;
struct reset_control *cpu_init_rst;
};
#ifdef CONFIG_ATH10K_AHB