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pinctrl: cherryview: prevent concurrent access to GPIO controllers 

Due to a silicon issue on the Atom X5-Z8000 "Cherry Trail" processor
series, a common lock must be used to prevent concurrent accesses
across the 4 GPIO controllers managed by this driver.

See Intel Atom Z8000 Processor Series Specification Update
(Rev. 005), errata #CHT34, for further information.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Dan O'Donovan <dan@emutex.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Dan O'Donovan 2016-06-10 13:23:34 +01:00 committed by Linus Walleij
parent 38c1e5e7b9
commit 0bd50d719b
1 changed files with 44 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
drivers/pinctrl/intel/pinctrl-cherryview.c
View File

@ -160,7 +160,6 @@ struct chv_pin_context {
* @pctldev: Pointer to the pin controller device * @pctldev: Pointer to the pin controller device
* @chip: GPIO chip in this pin controller * @chip: GPIO chip in this pin controller
* @regs: MMIO registers * @regs: MMIO registers
* @lock: Lock to serialize register accesses
* @intr_lines: Stores mapping between 16 HW interrupt wires and GPIO * @intr_lines: Stores mapping between 16 HW interrupt wires and GPIO
* offset (in GPIO number space) * offset (in GPIO number space)
* @community: Community this pinctrl instance represents * @community: Community this pinctrl instance represents
@ -174,7 +173,6 @@ struct chv_pinctrl {
struct pinctrl_dev *pctldev; struct pinctrl_dev *pctldev;
struct gpio_chip chip; struct gpio_chip chip;
void __iomem *regs; void __iomem *regs;
raw_spinlock_t lock;
unsigned intr_lines[16]; unsigned intr_lines[16];
const struct chv_community *community; const struct chv_community *community;
u32 saved_intmask; u32 saved_intmask;
@ -657,6 +655,17 @@ static const struct chv_community *chv_communities[] = {
&southeast_community, &southeast_community,
}; };
/*
* Lock to serialize register accesses
*
* Due to a silicon issue, a shared lock must be used to prevent
* concurrent accesses across the 4 GPIO controllers.
*
* See Intel Atom Z8000 Processor Series Specification Update (Rev. 005),
* errata #CHT34, for further information.
*/
static DEFINE_RAW_SPINLOCK(chv_lock);
static void __iomem *chv_padreg(struct chv_pinctrl *pctrl, unsigned offset, static void __iomem *chv_padreg(struct chv_pinctrl *pctrl, unsigned offset,
unsigned reg) unsigned reg)
{ {
@ -718,13 +727,13 @@ static void chv_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
u32 ctrl0, ctrl1; u32 ctrl0, ctrl1;
bool locked; bool locked;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
ctrl0 = readl(chv_padreg(pctrl, offset, CHV_PADCTRL0)); ctrl0 = readl(chv_padreg(pctrl, offset, CHV_PADCTRL0));
ctrl1 = readl(chv_padreg(pctrl, offset, CHV_PADCTRL1)); ctrl1 = readl(chv_padreg(pctrl, offset, CHV_PADCTRL1));
locked = chv_pad_locked(pctrl, offset); locked = chv_pad_locked(pctrl, offset);
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
if (ctrl0 & CHV_PADCTRL0_GPIOEN) { if (ctrl0 & CHV_PADCTRL0_GPIOEN) {
seq_puts(s, "GPIO "); seq_puts(s, "GPIO ");
@ -787,14 +796,14 @@ static int chv_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned function,
grp = &pctrl->community->groups[group]; grp = &pctrl->community->groups[group];
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
/* Check first that the pad is not locked */ /* Check first that the pad is not locked */
for (i = 0; i < grp->npins; i++) { for (i = 0; i < grp->npins; i++) {
if (chv_pad_locked(pctrl, grp->pins[i])) { if (chv_pad_locked(pctrl, grp->pins[i])) {
dev_warn(pctrl->dev, "unable to set mode for locked pin %u\n", dev_warn(pctrl->dev, "unable to set mode for locked pin %u\n",
grp->pins[i]); grp->pins[i]);
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return -EBUSY; return -EBUSY;
} }
} }
@ -837,7 +846,7 @@ static int chv_pinmux_set_mux(struct pinctrl_dev *pctldev, unsigned function,
pin, altfunc->mode, altfunc->invert_oe ? "" : "not "); pin, altfunc->mode, altfunc->invert_oe ? "" : "not ");
} }
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return 0; return 0;
} }
@ -851,13 +860,13 @@ static int chv_gpio_request_enable(struct pinctrl_dev *pctldev,
void __iomem *reg; void __iomem *reg;
u32 value; u32 value;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
if (chv_pad_locked(pctrl, offset)) { if (chv_pad_locked(pctrl, offset)) {
value = readl(chv_padreg(pctrl, offset, CHV_PADCTRL0)); value = readl(chv_padreg(pctrl, offset, CHV_PADCTRL0));
if (!(value & CHV_PADCTRL0_GPIOEN)) { if (!(value & CHV_PADCTRL0_GPIOEN)) {
/* Locked so cannot enable */ /* Locked so cannot enable */
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return -EBUSY; return -EBUSY;
} }
} else { } else {
@ -897,7 +906,7 @@ static int chv_gpio_request_enable(struct pinctrl_dev *pctldev,
chv_writel(value, reg); chv_writel(value, reg);
} }
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return 0; return 0;
} }
@ -911,13 +920,13 @@ static void chv_gpio_disable_free(struct pinctrl_dev *pctldev,
void __iomem *reg; void __iomem *reg;
u32 value; u32 value;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
reg = chv_padreg(pctrl, offset, CHV_PADCTRL0); reg = chv_padreg(pctrl, offset, CHV_PADCTRL0);
value = readl(reg) & ~CHV_PADCTRL0_GPIOEN; value = readl(reg) & ~CHV_PADCTRL0_GPIOEN;
chv_writel(value, reg); chv_writel(value, reg);
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
} }
static int chv_gpio_set_direction(struct pinctrl_dev *pctldev, static int chv_gpio_set_direction(struct pinctrl_dev *pctldev,
@ -929,7 +938,7 @@ static int chv_gpio_set_direction(struct pinctrl_dev *pctldev,
unsigned long flags; unsigned long flags;
u32 ctrl0; u32 ctrl0;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
ctrl0 = readl(reg) & ~CHV_PADCTRL0_GPIOCFG_MASK; ctrl0 = readl(reg) & ~CHV_PADCTRL0_GPIOCFG_MASK;
if (input) if (input)
@ -938,7 +947,7 @@ static int chv_gpio_set_direction(struct pinctrl_dev *pctldev,
ctrl0 |= CHV_PADCTRL0_GPIOCFG_GPO << CHV_PADCTRL0_GPIOCFG_SHIFT; ctrl0 |= CHV_PADCTRL0_GPIOCFG_GPO << CHV_PADCTRL0_GPIOCFG_SHIFT;
chv_writel(ctrl0, reg); chv_writel(ctrl0, reg);
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return 0; return 0;
} }
@ -963,10 +972,10 @@ static int chv_config_get(struct pinctrl_dev *pctldev, unsigned pin,
u16 arg = 0; u16 arg = 0;
u32 term; u32 term;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
ctrl0 = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0)); ctrl0 = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0));
ctrl1 = readl(chv_padreg(pctrl, pin, CHV_PADCTRL1)); ctrl1 = readl(chv_padreg(pctrl, pin, CHV_PADCTRL1));
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
term = (ctrl0 & CHV_PADCTRL0_TERM_MASK) >> CHV_PADCTRL0_TERM_SHIFT; term = (ctrl0 & CHV_PADCTRL0_TERM_MASK) >> CHV_PADCTRL0_TERM_SHIFT;
@ -1040,7 +1049,7 @@ static int chv_config_set_pull(struct chv_pinctrl *pctrl, unsigned pin,
unsigned long flags; unsigned long flags;
u32 ctrl0, pull; u32 ctrl0, pull;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
ctrl0 = readl(reg); ctrl0 = readl(reg);
switch (param) { switch (param) {
@ -1063,7 +1072,7 @@ static int chv_config_set_pull(struct chv_pinctrl *pctrl, unsigned pin,
pull = CHV_PADCTRL0_TERM_20K << CHV_PADCTRL0_TERM_SHIFT; pull = CHV_PADCTRL0_TERM_20K << CHV_PADCTRL0_TERM_SHIFT;
break; break;
default: default:
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return -EINVAL; return -EINVAL;
} }
@ -1081,7 +1090,7 @@ static int chv_config_set_pull(struct chv_pinctrl *pctrl, unsigned pin,
pull = CHV_PADCTRL0_TERM_20K << CHV_PADCTRL0_TERM_SHIFT; pull = CHV_PADCTRL0_TERM_20K << CHV_PADCTRL0_TERM_SHIFT;
break; break;
default: default:
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return -EINVAL; return -EINVAL;
} }
@ -1089,12 +1098,12 @@ static int chv_config_set_pull(struct chv_pinctrl *pctrl, unsigned pin,
break; break;
default: default:
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return -EINVAL; return -EINVAL;
} }
chv_writel(ctrl0, reg); chv_writel(ctrl0, reg);
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return 0; return 0;
} }
@ -1160,9 +1169,9 @@ static int chv_gpio_get(struct gpio_chip *chip, unsigned offset)
unsigned long flags; unsigned long flags;
u32 ctrl0, cfg; u32 ctrl0, cfg;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
ctrl0 = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0)); ctrl0 = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0));
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
cfg = ctrl0 & CHV_PADCTRL0_GPIOCFG_MASK; cfg = ctrl0 & CHV_PADCTRL0_GPIOCFG_MASK;
cfg >>= CHV_PADCTRL0_GPIOCFG_SHIFT; cfg >>= CHV_PADCTRL0_GPIOCFG_SHIFT;
@ -1180,7 +1189,7 @@ static void chv_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
void __iomem *reg; void __iomem *reg;
u32 ctrl0; u32 ctrl0;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
reg = chv_padreg(pctrl, pin, CHV_PADCTRL0); reg = chv_padreg(pctrl, pin, CHV_PADCTRL0);
ctrl0 = readl(reg); ctrl0 = readl(reg);
@ -1192,7 +1201,7 @@ static void chv_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
chv_writel(ctrl0, reg); chv_writel(ctrl0, reg);
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
} }
static int chv_gpio_get_direction(struct gpio_chip *chip, unsigned offset) static int chv_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
@ -1202,9 +1211,9 @@ static int chv_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
u32 ctrl0, direction; u32 ctrl0, direction;
unsigned long flags; unsigned long flags;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
ctrl0 = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0)); ctrl0 = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0));
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
direction = ctrl0 & CHV_PADCTRL0_GPIOCFG_MASK; direction = ctrl0 & CHV_PADCTRL0_GPIOCFG_MASK;
direction >>= CHV_PADCTRL0_GPIOCFG_SHIFT; direction >>= CHV_PADCTRL0_GPIOCFG_SHIFT;
@ -1242,14 +1251,14 @@ static void chv_gpio_irq_ack(struct irq_data *d)
int pin = chv_gpio_offset_to_pin(pctrl, irqd_to_hwirq(d)); int pin = chv_gpio_offset_to_pin(pctrl, irqd_to_hwirq(d));
u32 intr_line; u32 intr_line;
raw_spin_lock(&pctrl->lock); raw_spin_lock(&chv_lock);
intr_line = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0)); intr_line = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0));
intr_line &= CHV_PADCTRL0_INTSEL_MASK; intr_line &= CHV_PADCTRL0_INTSEL_MASK;
intr_line >>= CHV_PADCTRL0_INTSEL_SHIFT; intr_line >>= CHV_PADCTRL0_INTSEL_SHIFT;
chv_writel(BIT(intr_line), pctrl->regs + CHV_INTSTAT); chv_writel(BIT(intr_line), pctrl->regs + CHV_INTSTAT);
raw_spin_unlock(&pctrl->lock); raw_spin_unlock(&chv_lock);
} }
static void chv_gpio_irq_mask_unmask(struct irq_data *d, bool mask) static void chv_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
@ -1260,7 +1269,7 @@ static void chv_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
u32 value, intr_line; u32 value, intr_line;
unsigned long flags; unsigned long flags;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
intr_line = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0)); intr_line = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0));
intr_line &= CHV_PADCTRL0_INTSEL_MASK; intr_line &= CHV_PADCTRL0_INTSEL_MASK;
@ -1273,7 +1282,7 @@ static void chv_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
value |= BIT(intr_line); value |= BIT(intr_line);
chv_writel(value, pctrl->regs + CHV_INTMASK); chv_writel(value, pctrl->regs + CHV_INTMASK);
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
} }
static void chv_gpio_irq_mask(struct irq_data *d) static void chv_gpio_irq_mask(struct irq_data *d)
@ -1307,7 +1316,7 @@ static unsigned chv_gpio_irq_startup(struct irq_data *d)
unsigned long flags; unsigned long flags;
u32 intsel, value; u32 intsel, value;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
intsel = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0)); intsel = readl(chv_padreg(pctrl, pin, CHV_PADCTRL0));
intsel &= CHV_PADCTRL0_INTSEL_MASK; intsel &= CHV_PADCTRL0_INTSEL_MASK;
intsel >>= CHV_PADCTRL0_INTSEL_SHIFT; intsel >>= CHV_PADCTRL0_INTSEL_SHIFT;
@ -1322,7 +1331,7 @@ static unsigned chv_gpio_irq_startup(struct irq_data *d)
irq_set_handler_locked(d, handler); irq_set_handler_locked(d, handler);
pctrl->intr_lines[intsel] = offset; pctrl->intr_lines[intsel] = offset;
} }
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
} }
chv_gpio_irq_unmask(d); chv_gpio_irq_unmask(d);
@ -1338,7 +1347,7 @@ static int chv_gpio_irq_type(struct irq_data *d, unsigned type)
unsigned long flags; unsigned long flags;
u32 value; u32 value;
raw_spin_lock_irqsave(&pctrl->lock, flags); raw_spin_lock_irqsave(&chv_lock, flags);
/* /*
* Pins which can be used as shared interrupt are configured in * Pins which can be used as shared interrupt are configured in
@ -1387,7 +1396,7 @@ static int chv_gpio_irq_type(struct irq_data *d, unsigned type)
else if (type & IRQ_TYPE_LEVEL_MASK) else if (type & IRQ_TYPE_LEVEL_MASK)
irq_set_handler_locked(d, handle_level_irq); irq_set_handler_locked(d, handle_level_irq);
raw_spin_unlock_irqrestore(&pctrl->lock, flags); raw_spin_unlock_irqrestore(&chv_lock, flags);
return 0; return 0;
} }
@ -1499,7 +1508,6 @@ static int chv_pinctrl_probe(struct platform_device *pdev)
if (i == ARRAY_SIZE(chv_communities)) if (i == ARRAY_SIZE(chv_communities))
return -ENODEV; return -ENODEV;
raw_spin_lock_init(&pctrl->lock);
pctrl->dev = &pdev->dev; pctrl->dev = &pdev->dev;
#ifdef CONFIG_PM_SLEEP #ifdef CONFIG_PM_SLEEP