[PATCH 5.19 004/101] counter: 104-quad-8: Utilize iomap interface

From: William Breathitt Gray william.gray@linaro.org

[ Upstream commit b6e9cded90d46b1066a1ca260d8b5ecf67787aba ]

This driver doesn't need to access I/O ports directly via inb()/outb() and friends. This patch abstracts such access by calling ioport_map() to enable the use of more typical ioread8()/iowrite8() I/O memory accessor calls.

Link: https://lore.kernel.org/r/861c003318dce3d2bef4061711643bb04f5ec14f.165220192... Cc: Syed Nayyar Waris syednwaris@gmail.com Suggested-by: David Laight David.Laight@ACULAB.COM Reviewed-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: William Breathitt Gray william.gray@linaro.org Link: https://lore.kernel.org/r/e971b897cacfac4cb2eca478f5533d2875f5cadd.165781347... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Stable-dep-of: 2bc54aaa65d2 ("counter: 104-quad-8: Fix skipped IRQ lines during events configuration") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/counter/104-quad-8.c | 169 ++++++++++++++++++----------------- 1 file changed, 89 insertions(+), 80 deletions(-)

diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c index a17e51d65aca..43dde9abfdcf 100644 --- a/drivers/counter/104-quad-8.c +++ b/drivers/counter/104-quad-8.c @@ -63,7 +63,7 @@ struct quad8 { unsigned int synchronous_mode[QUAD8_NUM_COUNTERS]; unsigned int index_polarity[QUAD8_NUM_COUNTERS]; unsigned int cable_fault_enable; - unsigned int base; + void __iomem *base; };

#define QUAD8_REG_INTERRUPT_STATUS 0x10 @@ -118,8 +118,8 @@ static int quad8_signal_read(struct counter_device *counter, if (signal->id < 16) return -EINVAL;

- state = inb(priv->base + QUAD8_REG_INDEX_INPUT_LEVELS) - & BIT(signal->id - 16); + state = ioread8(priv->base + QUAD8_REG_INDEX_INPUT_LEVELS) & + BIT(signal->id - 16);

*level = (state) ? COUNTER_SIGNAL_LEVEL_HIGH : COUNTER_SIGNAL_LEVEL_LOW;

@@ -130,14 +130,14 @@ static int quad8_count_read(struct counter_device *counter, struct counter_count *count, u64 *val) { struct quad8 *const priv = counter_priv(counter); - const int base_offset = priv->base + 2 * count->id; + void __iomem *const base_offset = priv->base + 2 * count->id; unsigned int flags; unsigned int borrow; unsigned int carry; unsigned long irqflags; int i;

- flags = inb(base_offset + 1); + flags = ioread8(base_offset + 1); borrow = flags & QUAD8_FLAG_BT; carry = !!(flags & QUAD8_FLAG_CT);

@@ -147,11 +147,11 @@ static int quad8_count_read(struct counter_device *counter, spin_lock_irqsave(&priv->lock, irqflags);

/* Reset Byte Pointer; transfer Counter to Output Latch */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT, - base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT, + base_offset + 1);

for (i = 0; i < 3; i++) - *val |= (unsigned long)inb(base_offset) << (8 * i); + *val |= (unsigned long)ioread8(base_offset) << (8 * i);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -162,7 +162,7 @@ static int quad8_count_write(struct counter_device *counter, struct counter_count *count, u64 val) { struct quad8 *const priv = counter_priv(counter); - const int base_offset = priv->base + 2 * count->id; + void __iomem *const base_offset = priv->base + 2 * count->id; unsigned long irqflags; int i;

@@ -173,27 +173,27 @@ static int quad8_count_write(struct counter_device *counter, spin_lock_irqsave(&priv->lock, irqflags);

/* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);

/* Counter can only be set via Preset Register */ for (i = 0; i < 3; i++) - outb(val >> (8 * i), base_offset); + iowrite8(val >> (8 * i), base_offset);

/* Transfer Preset Register to Counter */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, base_offset + 1);

/* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);

/* Set Preset Register back to original value */ val = priv->preset[count->id]; for (i = 0; i < 3; i++) - outb(val >> (8 * i), base_offset); + iowrite8(val >> (8 * i), base_offset);

/* Reset Borrow, Carry, Compare, and Sign flags */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1); /* Reset Error flag */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -246,7 +246,7 @@ static int quad8_function_write(struct counter_device *counter, unsigned int *const quadrature_mode = priv->quadrature_mode + id; unsigned int *const scale = priv->quadrature_scale + id; unsigned int *const synchronous_mode = priv->synchronous_mode + id; - const int base_offset = priv->base + 2 * id + 1; + void __iomem *const base_offset = priv->base + 2 * id + 1; unsigned long irqflags; unsigned int mode_cfg; unsigned int idr_cfg; @@ -266,7 +266,7 @@ static int quad8_function_write(struct counter_device *counter, if (*synchronous_mode) { *synchronous_mode = 0; /* Disable synchronous function mode */ - outb(QUAD8_CTR_IDR | idr_cfg, base_offset); + iowrite8(QUAD8_CTR_IDR | idr_cfg, base_offset); } } else { *quadrature_mode = 1; @@ -292,7 +292,7 @@ static int quad8_function_write(struct counter_device *counter, }

/* Load mode configuration to Counter Mode Register */ - outb(QUAD8_CTR_CMR | mode_cfg, base_offset); + iowrite8(QUAD8_CTR_CMR | mode_cfg, base_offset);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -305,10 +305,10 @@ static int quad8_direction_read(struct counter_device *counter, { const struct quad8 *const priv = counter_priv(counter); unsigned int ud_flag; - const unsigned int flag_addr = priv->base + 2 * count->id + 1; + void __iomem *const flag_addr = priv->base + 2 * count->id + 1;

/* U/D flag: nonzero = up, zero = down */ - ud_flag = inb(flag_addr) & QUAD8_FLAG_UD; + ud_flag = ioread8(flag_addr) & QUAD8_FLAG_UD;

*direction = (ud_flag) ? COUNTER_COUNT_DIRECTION_FORWARD : COUNTER_COUNT_DIRECTION_BACKWARD; @@ -402,7 +402,7 @@ static int quad8_events_configure(struct counter_device *counter) struct counter_event_node *event_node; unsigned int next_irq_trigger; unsigned long ior_cfg; - unsigned long base_offset; + void __iomem *base_offset;

spin_lock_irqsave(&priv->lock, irqflags);

@@ -438,13 +438,13 @@ static int quad8_events_configure(struct counter_device *counter) priv->preset_enable[event_node->channel] << 1 | priv->irq_trigger[event_node->channel] << 3; base_offset = priv->base + 2 * event_node->channel + 1; - outb(QUAD8_CTR_IOR | ior_cfg, base_offset); + iowrite8(QUAD8_CTR_IOR | ior_cfg, base_offset);

/* Enable IRQ line */ irq_enabled |= BIT(event_node->channel); }

- outb(irq_enabled, priv->base + QUAD8_REG_INDEX_INTERRUPT); + iowrite8(irq_enabled, priv->base + QUAD8_REG_INDEX_INTERRUPT);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -508,7 +508,7 @@ static int quad8_index_polarity_set(struct counter_device *counter, { struct quad8 *const priv = counter_priv(counter); const size_t channel_id = signal->id - 16; - const int base_offset = priv->base + 2 * channel_id + 1; + void __iomem *const base_offset = priv->base + 2 * channel_id + 1; unsigned long irqflags; unsigned int idr_cfg = index_polarity << 1;

@@ -519,7 +519,7 @@ static int quad8_index_polarity_set(struct counter_device *counter, priv->index_polarity[channel_id] = index_polarity;

/* Load Index Control configuration to Index Control Register */ - outb(QUAD8_CTR_IDR | idr_cfg, base_offset); + iowrite8(QUAD8_CTR_IDR | idr_cfg, base_offset);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -549,7 +549,7 @@ static int quad8_synchronous_mode_set(struct counter_device *counter, { struct quad8 *const priv = counter_priv(counter); const size_t channel_id = signal->id - 16; - const int base_offset = priv->base + 2 * channel_id + 1; + void __iomem *const base_offset = priv->base + 2 * channel_id + 1; unsigned long irqflags; unsigned int idr_cfg = synchronous_mode;

@@ -566,7 +566,7 @@ static int quad8_synchronous_mode_set(struct counter_device *counter, priv->synchronous_mode[channel_id] = synchronous_mode;

/* Load Index Control configuration to Index Control Register */ - outb(QUAD8_CTR_IDR | idr_cfg, base_offset); + iowrite8(QUAD8_CTR_IDR | idr_cfg, base_offset);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -614,7 +614,7 @@ static int quad8_count_mode_write(struct counter_device *counter, struct quad8 *const priv = counter_priv(counter); unsigned int count_mode; unsigned int mode_cfg; - const int base_offset = priv->base + 2 * count->id + 1; + void __iomem *const base_offset = priv->base + 2 * count->id + 1; unsigned long irqflags;

/* Map Generic Counter count mode to 104-QUAD-8 count mode */ @@ -648,7 +648,7 @@ static int quad8_count_mode_write(struct counter_device *counter, mode_cfg |= (priv->quadrature_scale[count->id] + 1) << 3;

/* Load mode configuration to Counter Mode Register */ - outb(QUAD8_CTR_CMR | mode_cfg, base_offset); + iowrite8(QUAD8_CTR_CMR | mode_cfg, base_offset);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -669,7 +669,7 @@ static int quad8_count_enable_write(struct counter_device *counter, struct counter_count *count, u8 enable) { struct quad8 *const priv = counter_priv(counter); - const int base_offset = priv->base + 2 * count->id; + void __iomem *const base_offset = priv->base + 2 * count->id; unsigned long irqflags; unsigned int ior_cfg;

@@ -681,7 +681,7 @@ static int quad8_count_enable_write(struct counter_device *counter, priv->irq_trigger[count->id] << 3;

/* Load I/O control configuration */ - outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1); + iowrite8(QUAD8_CTR_IOR | ior_cfg, base_offset + 1);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -697,9 +697,9 @@ static int quad8_error_noise_get(struct counter_device *counter, struct counter_count *count, u32 *noise_error) { const struct quad8 *const priv = counter_priv(counter); - const int base_offset = priv->base + 2 * count->id + 1; + void __iomem *const base_offset = priv->base + 2 * count->id + 1;

- *noise_error = !!(inb(base_offset) & QUAD8_FLAG_E); + *noise_error = !!(ioread8(base_offset) & QUAD8_FLAG_E);

return 0; } @@ -717,17 +717,17 @@ static int quad8_count_preset_read(struct counter_device *counter, static void quad8_preset_register_set(struct quad8 *const priv, const int id, const unsigned int preset) { - const unsigned int base_offset = priv->base + 2 * id; + void __iomem *const base_offset = priv->base + 2 * id; int i;

priv->preset[id] = preset;

/* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);

/* Set Preset Register */ for (i = 0; i < 3; i++) - outb(preset >> (8 * i), base_offset); + iowrite8(preset >> (8 * i), base_offset); }

static int quad8_count_preset_write(struct counter_device *counter, @@ -816,7 +816,7 @@ static int quad8_count_preset_enable_write(struct counter_device *counter, u8 preset_enable) { struct quad8 *const priv = counter_priv(counter); - const int base_offset = priv->base + 2 * count->id + 1; + void __iomem *const base_offset = priv->base + 2 * count->id + 1; unsigned long irqflags; unsigned int ior_cfg;

@@ -831,7 +831,7 @@ static int quad8_count_preset_enable_write(struct counter_device *counter, priv->irq_trigger[count->id] << 3;

/* Load I/O control configuration to Input / Output Control Register */ - outb(QUAD8_CTR_IOR | ior_cfg, base_offset); + iowrite8(QUAD8_CTR_IOR | ior_cfg, base_offset);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -858,7 +858,7 @@ static int quad8_signal_cable_fault_read(struct counter_device *counter, }

/* Logic 0 = cable fault */ - status = inb(priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS); + status = ioread8(priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -899,7 +899,8 @@ static int quad8_signal_cable_fault_enable_write(struct counter_device *counter, /* Enable is active low in Differential Encoder Cable Status register */ cable_fault_enable = ~priv->cable_fault_enable;

- outb(cable_fault_enable, priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS); + iowrite8(cable_fault_enable, + priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -923,7 +924,7 @@ static int quad8_signal_fck_prescaler_write(struct counter_device *counter, { struct quad8 *const priv = counter_priv(counter); const size_t channel_id = signal->id / 2; - const int base_offset = priv->base + 2 * channel_id; + void __iomem *const base_offset = priv->base + 2 * channel_id; unsigned long irqflags;

spin_lock_irqsave(&priv->lock, irqflags); @@ -931,12 +932,12 @@ static int quad8_signal_fck_prescaler_write(struct counter_device *counter, priv->fck_prescaler[channel_id] = prescaler;

/* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1);

/* Set filter clock factor */ - outb(prescaler, base_offset); - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, - base_offset + 1); + iowrite8(prescaler, base_offset); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, + base_offset + 1);

spin_unlock_irqrestore(&priv->lock, irqflags);

@@ -1084,12 +1085,12 @@ static irqreturn_t quad8_irq_handler(int irq, void *private) { struct counter_device *counter = private; struct quad8 *const priv = counter_priv(counter); - const unsigned long base = priv->base; + void __iomem *const base = priv->base; unsigned long irq_status; unsigned long channel; u8 event;

- irq_status = inb(base + QUAD8_REG_INTERRUPT_STATUS); + irq_status = ioread8(base + QUAD8_REG_INTERRUPT_STATUS); if (!irq_status) return IRQ_NONE;

@@ -1118,17 +1119,43 @@ static irqreturn_t quad8_irq_handler(int irq, void *private) }

/* Clear pending interrupts on device */ - outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base + QUAD8_REG_CHAN_OP); + iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base + QUAD8_REG_CHAN_OP);

return IRQ_HANDLED; }

+static void quad8_init_counter(void __iomem *const base_offset) +{ + unsigned long i; + + /* Reset Byte Pointer */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); + /* Reset filter clock factor */ + iowrite8(0, base_offset); + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, + base_offset + 1); + /* Reset Byte Pointer */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); + /* Reset Preset Register */ + for (i = 0; i < 3; i++) + iowrite8(0x00, base_offset); + /* Reset Borrow, Carry, Compare, and Sign flags */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1); + /* Reset Error flag */ + iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1); + /* Binary encoding; Normal count; non-quadrature mode */ + iowrite8(QUAD8_CTR_CMR, base_offset + 1); + /* Disable A and B inputs; preset on index; FLG1 as Carry */ + iowrite8(QUAD8_CTR_IOR, base_offset + 1); + /* Disable index function; negative index polarity */ + iowrite8(QUAD8_CTR_IDR, base_offset + 1); +} + static int quad8_probe(struct device *dev, unsigned int id) { struct counter_device *counter; struct quad8 *priv; - int i, j; - unsigned int base_offset; + unsigned long i; int err;

if (!devm_request_region(dev, base[id], QUAD8_EXTENT, dev_name(dev))) { @@ -1142,6 +1169,10 @@ static int quad8_probe(struct device *dev, unsigned int id) return -ENOMEM; priv = counter_priv(counter);

+ priv->base = devm_ioport_map(dev, base[id], QUAD8_EXTENT); + if (!priv->base) + return -ENOMEM; + /* Initialize Counter device and driver data */ counter->name = dev_name(dev); counter->parent = dev; @@ -1150,43 +1181,21 @@ static int quad8_probe(struct device *dev, unsigned int id) counter->num_counts = ARRAY_SIZE(quad8_counts); counter->signals = quad8_signals; counter->num_signals = ARRAY_SIZE(quad8_signals); - priv->base = base[id];

spin_lock_init(&priv->lock);

/* Reset Index/Interrupt Register */ - outb(0x00, base[id] + QUAD8_REG_INDEX_INTERRUPT); + iowrite8(0x00, priv->base + QUAD8_REG_INDEX_INTERRUPT); /* Reset all counters and disable interrupt function */ - outb(QUAD8_CHAN_OP_RESET_COUNTERS, base[id] + QUAD8_REG_CHAN_OP); + iowrite8(QUAD8_CHAN_OP_RESET_COUNTERS, priv->base + QUAD8_REG_CHAN_OP); /* Set initial configuration for all counters */ - for (i = 0; i < QUAD8_NUM_COUNTERS; i++) { - base_offset = base[id] + 2 * i; - /* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); - /* Reset filter clock factor */ - outb(0, base_offset); - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, - base_offset + 1); - /* Reset Byte Pointer */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, base_offset + 1); - /* Reset Preset Register */ - for (j = 0; j < 3; j++) - outb(0x00, base_offset); - /* Reset Borrow, Carry, Compare, and Sign flags */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, base_offset + 1); - /* Reset Error flag */ - outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, base_offset + 1); - /* Binary encoding; Normal count; non-quadrature mode */ - outb(QUAD8_CTR_CMR, base_offset + 1); - /* Disable A and B inputs; preset on index; FLG1 as Carry */ - outb(QUAD8_CTR_IOR, base_offset + 1); - /* Disable index function; negative index polarity */ - outb(QUAD8_CTR_IDR, base_offset + 1); - } + for (i = 0; i < QUAD8_NUM_COUNTERS; i++) + quad8_init_counter(priv->base + 2 * i); /* Disable Differential Encoder Cable Status for all channels */ - outb(0xFF, base[id] + QUAD8_DIFF_ENCODER_CABLE_STATUS); + iowrite8(0xFF, priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS); /* Enable all counters and enable interrupt function */ - outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base[id] + QUAD8_REG_CHAN_OP); + iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, + priv->base + QUAD8_REG_CHAN_OP);

err = devm_request_irq(&counter->dev, irq[id], quad8_irq_handler, IRQF_SHARED, counter->name, counter);