[RFC PATCH 04/18] mmc: msm: move clk-reset logic to platform
From: Arnd Bergmann
Date: Wed Mar 04 2015 - 14:34:21 EST
There is no generic interface for resetting a clock, and
creating a reset driver for msm seems overkill, so this
moves the reset logic from the msm_sdcc driver into
a platform_data callback that calls into the clock driver.
This follows the model that is used for all other devices
on the msm platform that require a clk reset.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
arch/arm/mach-msm/board-qsd8x50.c | 18 +++++++++++++++++-
arch/arm/mach-msm/board-trout-mmc.c | 18 ++++++++++++++++++
arch/arm/mach-msm/clock.c | 2 +-
drivers/mmc/host/msm_sdcc.c | 12 ++----------
include/linux/platform_data/mmc-msm_sdcc.h | 3 +++
5 files changed, 41 insertions(+), 12 deletions(-)
diff --git a/arch/arm/mach-msm/board-qsd8x50.c b/arch/arm/mach-msm/board-qsd8x50.c
index 4c748616ef47..9676a73683d2 100644
--- a/arch/arm/mach-msm/board-qsd8x50.c
+++ b/arch/arm/mach-msm/board-qsd8x50.c
@@ -180,6 +180,21 @@ static uint32_t msm_sdcc_setup_power(struct device *dv, unsigned int vdd)
return 0;
}
+static void msm_sdcc_clk_reset(struct clk *clk)
+{
+ int ret;
+
+ ret = clk_reset(clk, CLK_RESET_ASSERT);
+ if (ret)
+ pr_err("sdcc clock assert failed at %lu Hz with err %d\n",
+ clk_get_rate(clk), ret);
+
+ ret = clk_reset(clk, CLK_RESET_DEASSERT);
+ if (ret)
+ pr_err("sdcc clock deassert failed at %lu Hz with err %d\n",
+ clk_get_rate(clk), ret);
+}
+
static struct msm_mmc_gpio_data sdc1_gpio = {
.gpio = sdc1_gpio_cfg,
.size = ARRAY_SIZE(sdc1_gpio_cfg),
@@ -188,7 +203,8 @@ static struct msm_mmc_gpio_data sdc1_gpio = {
static struct msm_mmc_platform_data qsd8x50_sdc1_data = {
.ocr_mask = MMC_VDD_27_28 | MMC_VDD_28_29,
.translate_vdd = msm_sdcc_setup_power,
- .gpio_data = &sdc1_gpio,
+ .gpio_data = &sdc1_gpio,
+ .clk_reset = msm_sdcc_clk_reset,
};
static void __init qsd8x50_init_mmc(void)
diff --git a/arch/arm/mach-msm/board-trout-mmc.c b/arch/arm/mach-msm/board-trout-mmc.c
index 3723e55819d6..2474bba71c8b 100644
--- a/arch/arm/mach-msm/board-trout-mmc.c
+++ b/arch/arm/mach-msm/board-trout-mmc.c
@@ -2,6 +2,7 @@
** Author: Brian Swetland <swetland@xxxxxxxxxx>
*/
#include <linux/gpio.h>
+#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
@@ -14,6 +15,7 @@
#include <asm/io.h>
#include <mach/vreg.h>
+#include <mach/clk.h>
#include <linux/platform_data/mmc-msm_sdcc.h>
@@ -154,6 +156,21 @@ static unsigned int trout_sdslot_status(struct device *dev)
return (!status);
}
+static void trout_sdcc_clk_reset(struct clk *clk)
+{
+ int ret;
+
+ ret = clk_reset(clk, CLK_RESET_ASSERT);
+ if (ret)
+ pr_err("sdcc clock assert failed at %lu Hz with err %d\n",
+ clk_get_rate(clk), ret);
+
+ ret = clk_reset(clk, CLK_RESET_DEASSERT);
+ if (ret)
+ pr_err("sdcc clock deassert failed at %lu Hz with err %d\n",
+ clk_get_rate(clk), ret);
+}
+
#define TROUT_MMC_VDD MMC_VDD_165_195 | MMC_VDD_20_21 | MMC_VDD_21_22 \
| MMC_VDD_22_23 | MMC_VDD_23_24 | MMC_VDD_24_25 \
| MMC_VDD_25_26 | MMC_VDD_26_27 | MMC_VDD_27_28 \
@@ -163,6 +180,7 @@ static struct msm_mmc_platform_data trout_sdslot_data = {
.ocr_mask = TROUT_MMC_VDD,
.status = trout_sdslot_status,
.translate_vdd = trout_sdslot_switchvdd,
+ .clk_reset = trout_sdcc_clk_reset,
};
int __init trout_init_mmc(unsigned int sys_rev)
diff --git a/arch/arm/mach-msm/clock.c b/arch/arm/mach-msm/clock.c
index 35ea02b52483..0b59ad5eb557 100644
--- a/arch/arm/mach-msm/clock.c
+++ b/arch/arm/mach-msm/clock.c
@@ -23,6 +23,6 @@ int clk_reset(struct clk *clk, enum clk_reset_action action)
{
struct clk_hw *hw = __clk_get_hw(clk);
struct msm_clk *m = to_msm_clk(hw);
+
return m->reset(hw, action);
}
-EXPORT_SYMBOL(clk_reset);
diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c
index 3002e377e9f7..be5b9b3b3843 100644
--- a/drivers/mmc/host/msm_sdcc.c
+++ b/drivers/mmc/host/msm_sdcc.c
@@ -45,7 +45,6 @@
#include <asm/sizes.h>
#include <linux/platform_data/mmc-msm_sdcc.h>
-#include <mach/clk.h>
/* data mover definitions */
@@ -493,15 +492,8 @@ static void msmsdcc_reset_and_restore(struct msmsdcc_host *host)
mci_mask0 = readl(host->base + MMCIMASK0);
/* Reset the controller */
- ret = clk_reset(host->clk, CLK_RESET_ASSERT);
- if (ret)
- pr_err("%s: Clock assert failed at %u Hz with err %d\n",
- mmc_hostname(host->mmc), host->clk_rate, ret);
-
- ret = clk_reset(host->clk, CLK_RESET_DEASSERT);
- if (ret)
- pr_err("%s: Clock deassert failed at %u Hz with err %d\n",
- mmc_hostname(host->mmc), host->clk_rate, ret);
+ if (host->plat->clk_reset)
+ host->plat->clk_reset(host->clk);
pr_info("%s: Controller has been re-initialiazed\n",
mmc_hostname(host->mmc));
diff --git a/include/linux/platform_data/mmc-msm_sdcc.h b/include/linux/platform_data/mmc-msm_sdcc.h
index 55aa873c9396..6f1821a4bf93 100644
--- a/include/linux/platform_data/mmc-msm_sdcc.h
+++ b/include/linux/platform_data/mmc-msm_sdcc.h
@@ -15,6 +15,8 @@ struct msm_mmc_gpio_data {
u8 size;
};
+struct clk;
+
struct msm_mmc_platform_data {
unsigned int ocr_mask; /* available voltages */
u32 (*translate_vdd)(struct device *, unsigned int);
@@ -22,6 +24,7 @@ struct msm_mmc_platform_data {
int (*register_status_notify)(void (*callback)(int card_present, void *dev_id), void *dev_id);
struct msm_mmc_gpio_data *gpio_data;
void (*init_card)(struct mmc_card *card);
+ void (*clk_reset)(struct clk *clk);
};
#endif
--
2.1.0.rc2
--
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