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Message-ID: <1352375742-29611-1-git-send-email-linus.walleij@stericsson.com>
Date: Thu, 8 Nov 2012 12:55:42 +0100
From: Linus Walleij <linus.walleij@...ricsson.com>
To: <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <arm@...nel.org>
Cc: Stephen Warren <swarren@...dia.com>,
Anmar Oueja <anmar.oueja@...aro.org>,
Jonas Aaberg <jonas.aberg@...ricsson.com>,
Loic Pallardy <loic.pallardy@...com>,
Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 2/2] pinctrl/nomadik: make independent of prcmu driver
From: Jonas Aaberg <jonas.aberg@...ricsson.com>
Currently there are some unnecessary criss-cross
dependencies between the PRCMU driver in MFD and a lot of
other drivers, mainly because other drivers need to poke
around in the PRCM register range.
In cases like this there are actually just a few select
registers that the pinctrl driver need to read/modify/write,
and it turns out that no other driver is actually using
these registers, so there are no concurrency issues
whatsoever.
So: don't let the location of the register range complicate
things, just poke into these registers directly and skip
a layer of indirection.
Cc: Loic Pallardy <loic.pallardy@...com>
Signed-off-by: Jonas Aaberg <jonas.aberg@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
drivers/pinctrl/pinctrl-nomadik-db8500.c | 4 +--
drivers/pinctrl/pinctrl-nomadik-db8540.c | 4 +--
drivers/pinctrl/pinctrl-nomadik-stn8815.c | 4 +--
drivers/pinctrl/pinctrl-nomadik.c | 52 ++++++++++++++++++-------------
drivers/pinctrl/pinctrl-nomadik.h | 14 +++++----
5 files changed, 45 insertions(+), 33 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-nomadik-db8500.c b/drivers/pinctrl/pinctrl-nomadik-db8500.c
index 6de52e7..e73d75e 100644
--- a/drivers/pinctrl/pinctrl-nomadik-db8500.c
+++ b/drivers/pinctrl/pinctrl-nomadik-db8500.c
@@ -1230,7 +1230,7 @@ static const u16 db8500_prcm_gpiocr_regs[] = {
[PRCM_IDX_GPIOCR2] = 0x574,
};
-static const struct nmk_pinctrl_soc_data nmk_db8500_soc = {
+static struct nmk_pinctrl_soc_data nmk_db8500_soc = {
.gpio_ranges = nmk_db8500_ranges,
.gpio_num_ranges = ARRAY_SIZE(nmk_db8500_ranges),
.pins = nmk_db8500_pins,
@@ -1245,7 +1245,7 @@ static const struct nmk_pinctrl_soc_data nmk_db8500_soc = {
};
void __devinit
-nmk_pinctrl_db8500_init(const struct nmk_pinctrl_soc_data **soc)
+nmk_pinctrl_db8500_init(struct nmk_pinctrl_soc_data **soc)
{
*soc = &nmk_db8500_soc;
}
diff --git a/drivers/pinctrl/pinctrl-nomadik-db8540.c b/drivers/pinctrl/pinctrl-nomadik-db8540.c
index 52fc301..1276ba3 100644
--- a/drivers/pinctrl/pinctrl-nomadik-db8540.c
+++ b/drivers/pinctrl/pinctrl-nomadik-db8540.c
@@ -1240,7 +1240,7 @@ static const u16 db8540_prcm_gpiocr_regs[] = {
[PRCM_IDX_GPIOCR3] = 0x2bc,
};
-static const struct nmk_pinctrl_soc_data nmk_db8540_soc = {
+static struct nmk_pinctrl_soc_data nmk_db8540_soc = {
.gpio_ranges = nmk_db8540_ranges,
.gpio_num_ranges = ARRAY_SIZE(nmk_db8540_ranges),
.pins = nmk_db8540_pins,
@@ -1255,7 +1255,7 @@ static const struct nmk_pinctrl_soc_data nmk_db8540_soc = {
};
void __devinit
-nmk_pinctrl_db8540_init(const struct nmk_pinctrl_soc_data **soc)
+nmk_pinctrl_db8540_init(struct nmk_pinctrl_soc_data **soc)
{
*soc = &nmk_db8540_soc;
}
diff --git a/drivers/pinctrl/pinctrl-nomadik-stn8815.c b/drivers/pinctrl/pinctrl-nomadik-stn8815.c
index 7d432c3..ed5b144 100644
--- a/drivers/pinctrl/pinctrl-nomadik-stn8815.c
+++ b/drivers/pinctrl/pinctrl-nomadik-stn8815.c
@@ -339,7 +339,7 @@ static const struct nmk_function nmk_stn8815_functions[] = {
FUNCTION(i2cusb),
};
-static const struct nmk_pinctrl_soc_data nmk_stn8815_soc = {
+static struct nmk_pinctrl_soc_data nmk_stn8815_soc = {
.gpio_ranges = nmk_stn8815_ranges,
.gpio_num_ranges = ARRAY_SIZE(nmk_stn8815_ranges),
.pins = nmk_stn8815_pins,
@@ -351,7 +351,7 @@ static const struct nmk_pinctrl_soc_data nmk_stn8815_soc = {
};
void __devinit
-nmk_pinctrl_stn8815_init(const struct nmk_pinctrl_soc_data **soc)
+nmk_pinctrl_stn8815_init(struct nmk_pinctrl_soc_data **soc)
{
*soc = &nmk_stn8815_soc;
}
diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c
index 22f6937..33c614e 100644
--- a/drivers/pinctrl/pinctrl-nomadik.c
+++ b/drivers/pinctrl/pinctrl-nomadik.c
@@ -30,20 +30,6 @@
#include <linux/pinctrl/pinconf.h>
/* Since we request GPIOs from ourself */
#include <linux/pinctrl/consumer.h>
-/*
- * For the U8500 archs, use the PRCMU register interface, for the older
- * Nomadik, provide some stubs. The functions using these will only be
- * called on the U8500 series.
- */
-#ifdef CONFIG_ARCH_U8500
-#include <linux/mfd/dbx500-prcmu.h>
-#else
-static inline u32 prcmu_read(unsigned int reg) {
- return 0;
-}
-static inline void prcmu_write(unsigned int reg, u32 value) {}
-static inline void prcmu_write_masked(unsigned int reg, u32 mask, u32 value) {}
-#endif
#include <linux/platform_data/pinctrl-nomadik.h>
#include <asm/mach/irq.h>
@@ -85,7 +71,7 @@ struct nmk_gpio_chip {
struct nmk_pinctrl {
struct device *dev;
struct pinctrl_dev *pctl;
- const struct nmk_pinctrl_soc_data *soc;
+ struct nmk_pinctrl_soc_data *soc;
};
static struct nmk_gpio_chip *
@@ -247,6 +233,15 @@ nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset)
dev_dbg(nmk_chip->chip.dev, "%d: clearing interrupt mask\n", gpio);
}
+static void nmk_write_masked(void __iomem *reg, u32 mask, u32 value)
+{
+ u32 val;
+
+ val = readl(reg);
+ val = ((val & ~mask) | (value & mask));
+ writel(val, reg);
+}
+
static void nmk_prcm_altcx_set_mode(struct nmk_pinctrl *npct,
unsigned offset, unsigned alt_num)
{
@@ -285,8 +280,8 @@ static void nmk_prcm_altcx_set_mode(struct nmk_pinctrl *npct,
if (pin_desc->altcx[i].used == true) {
reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
bit = pin_desc->altcx[i].control_bit;
- if (prcmu_read(reg) & BIT(bit)) {
- prcmu_write_masked(reg, BIT(bit), 0);
+ if (readl(npct->soc->prcmu_base + reg) & BIT(bit)) {
+ nmk_write_masked(npct->soc->prcmu_base + reg, BIT(bit), 0);
dev_dbg(npct->dev,
"PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n",
offset, i+1);
@@ -314,8 +309,8 @@ static void nmk_prcm_altcx_set_mode(struct nmk_pinctrl *npct,
if (pin_desc->altcx[i].used == true) {
reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
bit = pin_desc->altcx[i].control_bit;
- if (prcmu_read(reg) & BIT(bit)) {
- prcmu_write_masked(reg, BIT(bit), 0);
+ if (readl(npct->soc->prcmu_base + reg) & BIT(bit)) {
+ nmk_write_masked(npct->soc->prcmu_base + reg, BIT(bit), 0);
dev_dbg(npct->dev,
"PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n",
offset, i+1);
@@ -327,7 +322,7 @@ static void nmk_prcm_altcx_set_mode(struct nmk_pinctrl *npct,
bit = pin_desc->altcx[alt_index].control_bit;
dev_dbg(npct->dev, "PRCM GPIOCR: pin %i: alternate-C%i has been selected\n",
offset, alt_index+1);
- prcmu_write_masked(reg, BIT(bit), BIT(bit));
+ nmk_write_masked(npct->soc->prcmu_base + reg, BIT(bit), BIT(bit));
}
static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
@@ -693,7 +688,7 @@ static int nmk_prcm_gpiocr_get_mode(struct pinctrl_dev *pctldev, int gpio)
if (pin_desc->altcx[i].used == true) {
reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
bit = pin_desc->altcx[i].control_bit;
- if (prcmu_read(reg) & BIT(bit))
+ if (readl(npct->soc->prcmu_base + reg) & BIT(bit))
return NMK_GPIO_ALT_C+i+1;
}
}
@@ -1851,6 +1846,7 @@ static int __devinit nmk_pinctrl_probe(struct platform_device *pdev)
const struct platform_device_id *platid = platform_get_device_id(pdev);
struct device_node *np = pdev->dev.of_node;
struct nmk_pinctrl *npct;
+ struct resource *res;
unsigned int version = 0;
int i;
@@ -1872,6 +1868,20 @@ static int __devinit nmk_pinctrl_probe(struct platform_device *pdev)
if (version == PINCTRL_NMK_DB8540)
nmk_pinctrl_db8540_init(&npct->soc);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res) {
+ npct->soc->prcmu_base = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!npct->soc->prcmu_base) {
+ dev_err(&pdev->dev,
+ "failed to ioremap prcmu registers\n");
+ return -ENOMEM;
+ }
+ } else {
+ dev_info(&pdev->dev,
+ "No PRCMU base, assume no ALT-Cx control is available\n");
+ }
+
/*
* We need all the GPIO drivers to probe FIRST, or we will not be able
* to obtain references to the struct gpio_chip * for them, and we
diff --git a/drivers/pinctrl/pinctrl-nomadik.h b/drivers/pinctrl/pinctrl-nomadik.h
index bcd4191..9dd727a 100644
--- a/drivers/pinctrl/pinctrl-nomadik.h
+++ b/drivers/pinctrl/pinctrl-nomadik.h
@@ -125,6 +125,7 @@ struct nmk_pingroup {
* @altcx_pins: The pins that support Other alternate-C function on this SoC
* @npins_altcx: The number of Other alternate-C pins
* @prcm_gpiocr_registers: The array of PRCM GPIOCR registers on this SoC
+ * @prcmu_base: PRCMU virtual base
*/
struct nmk_pinctrl_soc_data {
struct pinctrl_gpio_range *gpio_ranges;
@@ -138,16 +139,17 @@ struct nmk_pinctrl_soc_data {
const struct prcm_gpiocr_altcx_pin_desc *altcx_pins;
unsigned npins_altcx;
const u16 *prcm_gpiocr_registers;
+ void __iomem *prcmu_base;
};
#ifdef CONFIG_PINCTRL_STN8815
-void nmk_pinctrl_stn8815_init(const struct nmk_pinctrl_soc_data **soc);
+void nmk_pinctrl_stn8815_init(struct nmk_pinctrl_soc_data **soc);
#else
static inline void
-nmk_pinctrl_stn8815_init(const struct nmk_pinctrl_soc_data **soc)
+nmk_pinctrl_stn8815_init(struct nmk_pinctrl_soc_data **soc)
{
}
@@ -155,12 +157,12 @@ nmk_pinctrl_stn8815_init(const struct nmk_pinctrl_soc_data **soc)
#ifdef CONFIG_PINCTRL_DB8500
-void nmk_pinctrl_db8500_init(const struct nmk_pinctrl_soc_data **soc);
+void nmk_pinctrl_db8500_init(struct nmk_pinctrl_soc_data **soc);
#else
static inline void
-nmk_pinctrl_db8500_init(const struct nmk_pinctrl_soc_data **soc)
+nmk_pinctrl_db8500_init(struct nmk_pinctrl_soc_data **soc)
{
}
@@ -168,12 +170,12 @@ nmk_pinctrl_db8500_init(const struct nmk_pinctrl_soc_data **soc)
#ifdef CONFIG_PINCTRL_DB8540
-void nmk_pinctrl_db8540_init(const struct nmk_pinctrl_soc_data **soc);
+void nmk_pinctrl_db8540_init(struct nmk_pinctrl_soc_data **soc);
#else
static inline void
-nmk_pinctrl_db8540_init(const struct nmk_pinctrl_soc_data **soc)
+nmk_pinctrl_db8540_init(struct nmk_pinctrl_soc_data **soc)
{
}
--
1.7.11.3
--
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