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Message-Id: <e971b897cacfac4cb2eca478f5533d2875f5cadd.1657813472.git.william.gray@linaro.org>
Date: Thu, 14 Jul 2022 12:07:13 -0400
From: William Breathitt Gray <william.gray@...aro.org>
To: gregkh@...uxfoundation.org
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
William Breathitt Gray <william.gray@...aro.org>,
David Laight <David.Laight@...LAB.COM>,
Syed Nayyar Waris <syednwaris@...il.com>,
Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 2/4] counter: 104-quad-8: Utilize iomap interface
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.
Suggested-by: David Laight <David.Laight@...LAB.COM>
Cc: Syed Nayyar Waris <syednwaris@...il.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Link: https://lore.kernel.org/r/861c003318dce3d2bef4061711643bb04f5ec14f.1652201921.git.william.gray@linaro.org
Signed-off-by: William Breathitt Gray <william.gray@...aro.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);
--
2.36.1
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