1f1d8a071SWilliam Breathitt Gray // SPDX-License-Identifier: GPL-2.0 2f1d8a071SWilliam Breathitt Gray /* 3f1d8a071SWilliam Breathitt Gray * Counter driver for the ACCES 104-QUAD-8 4f1d8a071SWilliam Breathitt Gray * Copyright (C) 2016 William Breathitt Gray 5f1d8a071SWilliam Breathitt Gray * 6f1d8a071SWilliam Breathitt Gray * This driver supports the ACCES 104-QUAD-8 and ACCES 104-QUAD-4. 7f1d8a071SWilliam Breathitt Gray */ 8f1d8a071SWilliam Breathitt Gray #include <linux/bitops.h> 9f1d8a071SWilliam Breathitt Gray #include <linux/counter.h> 10f1d8a071SWilliam Breathitt Gray #include <linux/device.h> 11f1d8a071SWilliam Breathitt Gray #include <linux/errno.h> 12f1d8a071SWilliam Breathitt Gray #include <linux/io.h> 13f1d8a071SWilliam Breathitt Gray #include <linux/ioport.h> 147aa2ba0dSWilliam Breathitt Gray #include <linux/interrupt.h> 15f1d8a071SWilliam Breathitt Gray #include <linux/isa.h> 16f1d8a071SWilliam Breathitt Gray #include <linux/kernel.h> 17c95cc0d9SWilliam Breathitt Gray #include <linux/list.h> 18f1d8a071SWilliam Breathitt Gray #include <linux/module.h> 19f1d8a071SWilliam Breathitt Gray #include <linux/moduleparam.h> 20f1d8a071SWilliam Breathitt Gray #include <linux/types.h> 2109db4678SWilliam Breathitt Gray #include <linux/spinlock.h> 22f1d8a071SWilliam Breathitt Gray 23f1d8a071SWilliam Breathitt Gray #define QUAD8_EXTENT 32 24f1d8a071SWilliam Breathitt Gray 25f1d8a071SWilliam Breathitt Gray static unsigned int base[max_num_isa_dev(QUAD8_EXTENT)]; 26f1d8a071SWilliam Breathitt Gray static unsigned int num_quad8; 27af383bb1SWilliam Breathitt Gray module_param_hw_array(base, uint, ioport, &num_quad8, 0); 28f1d8a071SWilliam Breathitt Gray MODULE_PARM_DESC(base, "ACCES 104-QUAD-8 base addresses"); 29f1d8a071SWilliam Breathitt Gray 307aa2ba0dSWilliam Breathitt Gray static unsigned int irq[max_num_isa_dev(QUAD8_EXTENT)]; 317aa2ba0dSWilliam Breathitt Gray module_param_hw_array(irq, uint, irq, NULL, 0); 327aa2ba0dSWilliam Breathitt Gray MODULE_PARM_DESC(irq, "ACCES 104-QUAD-8 interrupt line numbers"); 337aa2ba0dSWilliam Breathitt Gray 34f1d8a071SWilliam Breathitt Gray #define QUAD8_NUM_COUNTERS 8 35f1d8a071SWilliam Breathitt Gray 36f1d8a071SWilliam Breathitt Gray /** 37daae1ee5SWilliam Breathitt Gray * struct channel_reg - channel register structure 38daae1ee5SWilliam Breathitt Gray * @data: Count data 39daae1ee5SWilliam Breathitt Gray * @control: Channel flags and control 40daae1ee5SWilliam Breathitt Gray */ 41daae1ee5SWilliam Breathitt Gray struct channel_reg { 42daae1ee5SWilliam Breathitt Gray u8 data; 43daae1ee5SWilliam Breathitt Gray u8 control; 44daae1ee5SWilliam Breathitt Gray }; 45daae1ee5SWilliam Breathitt Gray 46daae1ee5SWilliam Breathitt Gray /** 47daae1ee5SWilliam Breathitt Gray * struct quad8_reg - device register structure 48daae1ee5SWilliam Breathitt Gray * @channel: quadrature counter data and control 49daae1ee5SWilliam Breathitt Gray * @interrupt_status: channel interrupt status 50daae1ee5SWilliam Breathitt Gray * @channel_oper: enable/reset counters and interrupt functions 51daae1ee5SWilliam Breathitt Gray * @index_interrupt: enable channel interrupts 52daae1ee5SWilliam Breathitt Gray * @reserved: reserved for Factory Use 53daae1ee5SWilliam Breathitt Gray * @index_input_levels: index signal logical input level 54daae1ee5SWilliam Breathitt Gray * @cable_status: differential encoder cable status 55daae1ee5SWilliam Breathitt Gray */ 56daae1ee5SWilliam Breathitt Gray struct quad8_reg { 57daae1ee5SWilliam Breathitt Gray struct channel_reg channel[QUAD8_NUM_COUNTERS]; 58daae1ee5SWilliam Breathitt Gray u8 interrupt_status; 59daae1ee5SWilliam Breathitt Gray u8 channel_oper; 60daae1ee5SWilliam Breathitt Gray u8 index_interrupt; 61daae1ee5SWilliam Breathitt Gray u8 reserved[3]; 62daae1ee5SWilliam Breathitt Gray u8 index_input_levels; 63daae1ee5SWilliam Breathitt Gray u8 cable_status; 64daae1ee5SWilliam Breathitt Gray }; 65daae1ee5SWilliam Breathitt Gray 66daae1ee5SWilliam Breathitt Gray /** 67e357e81fSWilliam Breathitt Gray * struct quad8 - device private data structure 6894a853ecSWilliam Breathitt Gray * @lock: lock to prevent clobbering device states during R/W ops 69f1d8a071SWilliam Breathitt Gray * @counter: instance of the counter_device 70954ab5ccSWilliam Breathitt Gray * @fck_prescaler: array of filter clock prescaler configurations 71f1d8a071SWilliam Breathitt Gray * @preset: array of preset values 72f1d8a071SWilliam Breathitt Gray * @count_mode: array of count mode configurations 73f1d8a071SWilliam Breathitt Gray * @quadrature_mode: array of quadrature mode configurations 74f1d8a071SWilliam Breathitt Gray * @quadrature_scale: array of quadrature mode scale configurations 75f1d8a071SWilliam Breathitt Gray * @ab_enable: array of A and B inputs enable configurations 76f1d8a071SWilliam Breathitt Gray * @preset_enable: array of set_to_preset_on_index attribute configurations 777aa2ba0dSWilliam Breathitt Gray * @irq_trigger: array of current IRQ trigger function configurations 78f1d8a071SWilliam Breathitt Gray * @synchronous_mode: array of index function synchronous mode configurations 79f1d8a071SWilliam Breathitt Gray * @index_polarity: array of index function polarity configurations 80954ab5ccSWilliam Breathitt Gray * @cable_fault_enable: differential encoder cable status enable configurations 81daae1ee5SWilliam Breathitt Gray * @reg: I/O address offset for the device registers 82f1d8a071SWilliam Breathitt Gray */ 83e357e81fSWilliam Breathitt Gray struct quad8 { 8409db4678SWilliam Breathitt Gray spinlock_t lock; 85de65d055SWilliam Breathitt Gray unsigned int fck_prescaler[QUAD8_NUM_COUNTERS]; 86f1d8a071SWilliam Breathitt Gray unsigned int preset[QUAD8_NUM_COUNTERS]; 87f1d8a071SWilliam Breathitt Gray unsigned int count_mode[QUAD8_NUM_COUNTERS]; 88f1d8a071SWilliam Breathitt Gray unsigned int quadrature_mode[QUAD8_NUM_COUNTERS]; 89f1d8a071SWilliam Breathitt Gray unsigned int quadrature_scale[QUAD8_NUM_COUNTERS]; 90f1d8a071SWilliam Breathitt Gray unsigned int ab_enable[QUAD8_NUM_COUNTERS]; 91f1d8a071SWilliam Breathitt Gray unsigned int preset_enable[QUAD8_NUM_COUNTERS]; 927aa2ba0dSWilliam Breathitt Gray unsigned int irq_trigger[QUAD8_NUM_COUNTERS]; 93f1d8a071SWilliam Breathitt Gray unsigned int synchronous_mode[QUAD8_NUM_COUNTERS]; 94f1d8a071SWilliam Breathitt Gray unsigned int index_polarity[QUAD8_NUM_COUNTERS]; 95954ab5ccSWilliam Breathitt Gray unsigned int cable_fault_enable; 96daae1ee5SWilliam Breathitt Gray struct quad8_reg __iomem *reg; 97f1d8a071SWilliam Breathitt Gray }; 98f1d8a071SWilliam Breathitt Gray 99f1d8a071SWilliam Breathitt Gray /* Borrow Toggle flip-flop */ 100f1d8a071SWilliam Breathitt Gray #define QUAD8_FLAG_BT BIT(0) 101f1d8a071SWilliam Breathitt Gray /* Carry Toggle flip-flop */ 102f1d8a071SWilliam Breathitt Gray #define QUAD8_FLAG_CT BIT(1) 103f1d8a071SWilliam Breathitt Gray /* Error flag */ 104f1d8a071SWilliam Breathitt Gray #define QUAD8_FLAG_E BIT(4) 105f1d8a071SWilliam Breathitt Gray /* Up/Down flag */ 106f1d8a071SWilliam Breathitt Gray #define QUAD8_FLAG_UD BIT(5) 107f1d8a071SWilliam Breathitt Gray /* Reset and Load Signal Decoders */ 108f1d8a071SWilliam Breathitt Gray #define QUAD8_CTR_RLD 0x00 109f1d8a071SWilliam Breathitt Gray /* Counter Mode Register */ 110f1d8a071SWilliam Breathitt Gray #define QUAD8_CTR_CMR 0x20 111f1d8a071SWilliam Breathitt Gray /* Input / Output Control Register */ 112f1d8a071SWilliam Breathitt Gray #define QUAD8_CTR_IOR 0x40 113f1d8a071SWilliam Breathitt Gray /* Index Control Register */ 114f1d8a071SWilliam Breathitt Gray #define QUAD8_CTR_IDR 0x60 115f1d8a071SWilliam Breathitt Gray /* Reset Byte Pointer (three byte data pointer) */ 116f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_RESET_BP 0x01 117f1d8a071SWilliam Breathitt Gray /* Reset Counter */ 118f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_RESET_CNTR 0x02 119f1d8a071SWilliam Breathitt Gray /* Reset Borrow Toggle, Carry Toggle, Compare Toggle, and Sign flags */ 120f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_RESET_FLAGS 0x04 121f1d8a071SWilliam Breathitt Gray /* Reset Error flag */ 122f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_RESET_E 0x06 123f1d8a071SWilliam Breathitt Gray /* Preset Register to Counter */ 124f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_PRESET_CNTR 0x08 125f1d8a071SWilliam Breathitt Gray /* Transfer Counter to Output Latch */ 126f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_CNTR_OUT 0x10 127de65d055SWilliam Breathitt Gray /* Transfer Preset Register LSB to FCK Prescaler */ 128de65d055SWilliam Breathitt Gray #define QUAD8_RLD_PRESET_PSC 0x18 129f1d8a071SWilliam Breathitt Gray #define QUAD8_CHAN_OP_RESET_COUNTERS 0x01 1307aa2ba0dSWilliam Breathitt Gray #define QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC 0x04 131f1d8a071SWilliam Breathitt Gray #define QUAD8_CMR_QUADRATURE_X1 0x08 132f1d8a071SWilliam Breathitt Gray #define QUAD8_CMR_QUADRATURE_X2 0x10 133f1d8a071SWilliam Breathitt Gray #define QUAD8_CMR_QUADRATURE_X4 0x18 134f1d8a071SWilliam Breathitt Gray 135f1d8a071SWilliam Breathitt Gray static int quad8_signal_read(struct counter_device *counter, 136493b938aSWilliam Breathitt Gray struct counter_signal *signal, 137493b938aSWilliam Breathitt Gray enum counter_signal_level *level) 138f1d8a071SWilliam Breathitt Gray { 139aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 140f1d8a071SWilliam Breathitt Gray unsigned int state; 141f1d8a071SWilliam Breathitt Gray 142f1d8a071SWilliam Breathitt Gray /* Only Index signal levels can be read */ 143f1d8a071SWilliam Breathitt Gray if (signal->id < 16) 144f1d8a071SWilliam Breathitt Gray return -EINVAL; 145f1d8a071SWilliam Breathitt Gray 146daae1ee5SWilliam Breathitt Gray state = ioread8(&priv->reg->index_input_levels) & BIT(signal->id - 16); 147f1d8a071SWilliam Breathitt Gray 148493b938aSWilliam Breathitt Gray *level = (state) ? COUNTER_SIGNAL_LEVEL_HIGH : COUNTER_SIGNAL_LEVEL_LOW; 149f1d8a071SWilliam Breathitt Gray 150f1d8a071SWilliam Breathitt Gray return 0; 151f1d8a071SWilliam Breathitt Gray } 152f1d8a071SWilliam Breathitt Gray 153f1d8a071SWilliam Breathitt Gray static int quad8_count_read(struct counter_device *counter, 154aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 *val) 155f1d8a071SWilliam Breathitt Gray { 156aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 157daae1ee5SWilliam Breathitt Gray struct channel_reg __iomem *const chan = priv->reg->channel + count->id; 158f1d8a071SWilliam Breathitt Gray unsigned int flags; 159f1d8a071SWilliam Breathitt Gray unsigned int borrow; 160f1d8a071SWilliam Breathitt Gray unsigned int carry; 16109db4678SWilliam Breathitt Gray unsigned long irqflags; 162f1d8a071SWilliam Breathitt Gray int i; 163f1d8a071SWilliam Breathitt Gray 164daae1ee5SWilliam Breathitt Gray flags = ioread8(&chan->control); 165f1d8a071SWilliam Breathitt Gray borrow = flags & QUAD8_FLAG_BT; 166f1d8a071SWilliam Breathitt Gray carry = !!(flags & QUAD8_FLAG_CT); 167f1d8a071SWilliam Breathitt Gray 168f1d8a071SWilliam Breathitt Gray /* Borrow XOR Carry effectively doubles count range */ 169d49e6ee2SWilliam Breathitt Gray *val = (unsigned long)(borrow ^ carry) << 24; 170f1d8a071SWilliam Breathitt Gray 17109db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 172fc069262SSyed Nayyar Waris 173f1d8a071SWilliam Breathitt Gray /* Reset Byte Pointer; transfer Counter to Output Latch */ 174b6e9cdedSWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT, 175daae1ee5SWilliam Breathitt Gray &chan->control); 176f1d8a071SWilliam Breathitt Gray 177f1d8a071SWilliam Breathitt Gray for (i = 0; i < 3; i++) 178daae1ee5SWilliam Breathitt Gray *val |= (unsigned long)ioread8(&chan->data) << (8 * i); 179f1d8a071SWilliam Breathitt Gray 18009db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 181fc069262SSyed Nayyar Waris 182f1d8a071SWilliam Breathitt Gray return 0; 183f1d8a071SWilliam Breathitt Gray } 184f1d8a071SWilliam Breathitt Gray 185f1d8a071SWilliam Breathitt Gray static int quad8_count_write(struct counter_device *counter, 186aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 val) 187f1d8a071SWilliam Breathitt Gray { 188aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 189daae1ee5SWilliam Breathitt Gray struct channel_reg __iomem *const chan = priv->reg->channel + count->id; 19009db4678SWilliam Breathitt Gray unsigned long irqflags; 191f1d8a071SWilliam Breathitt Gray int i; 192f1d8a071SWilliam Breathitt Gray 193f1d8a071SWilliam Breathitt Gray /* Only 24-bit values are supported */ 194d49e6ee2SWilliam Breathitt Gray if (val > 0xFFFFFF) 195e2ff3198SWilliam Breathitt Gray return -ERANGE; 196f1d8a071SWilliam Breathitt Gray 19709db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 198fc069262SSyed Nayyar Waris 199f1d8a071SWilliam Breathitt Gray /* Reset Byte Pointer */ 200daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 201f1d8a071SWilliam Breathitt Gray 202f1d8a071SWilliam Breathitt Gray /* Counter can only be set via Preset Register */ 203f1d8a071SWilliam Breathitt Gray for (i = 0; i < 3; i++) 204daae1ee5SWilliam Breathitt Gray iowrite8(val >> (8 * i), &chan->data); 205f1d8a071SWilliam Breathitt Gray 206f1d8a071SWilliam Breathitt Gray /* Transfer Preset Register to Counter */ 207daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, &chan->control); 208f1d8a071SWilliam Breathitt Gray 209f1d8a071SWilliam Breathitt Gray /* Reset Byte Pointer */ 210daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 211f1d8a071SWilliam Breathitt Gray 212f1d8a071SWilliam Breathitt Gray /* Set Preset Register back to original value */ 213d49e6ee2SWilliam Breathitt Gray val = priv->preset[count->id]; 214f1d8a071SWilliam Breathitt Gray for (i = 0; i < 3; i++) 215daae1ee5SWilliam Breathitt Gray iowrite8(val >> (8 * i), &chan->data); 216f1d8a071SWilliam Breathitt Gray 217f1d8a071SWilliam Breathitt Gray /* Reset Borrow, Carry, Compare, and Sign flags */ 218daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, &chan->control); 219f1d8a071SWilliam Breathitt Gray /* Reset Error flag */ 220daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, &chan->control); 221f1d8a071SWilliam Breathitt Gray 22209db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 223fc069262SSyed Nayyar Waris 224f1d8a071SWilliam Breathitt Gray return 0; 225f1d8a071SWilliam Breathitt Gray } 226f1d8a071SWilliam Breathitt Gray 227394a0150SWilliam Breathitt Gray static const enum counter_function quad8_count_functions_list[] = { 228aaec1a0fSWilliam Breathitt Gray COUNTER_FUNCTION_PULSE_DIRECTION, 229aaec1a0fSWilliam Breathitt Gray COUNTER_FUNCTION_QUADRATURE_X1_A, 230aaec1a0fSWilliam Breathitt Gray COUNTER_FUNCTION_QUADRATURE_X2_A, 231aaec1a0fSWilliam Breathitt Gray COUNTER_FUNCTION_QUADRATURE_X4, 232f1d8a071SWilliam Breathitt Gray }; 233f1d8a071SWilliam Breathitt Gray 234aaec1a0fSWilliam Breathitt Gray static int quad8_function_read(struct counter_device *counter, 235aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 236aaec1a0fSWilliam Breathitt Gray enum counter_function *function) 237f1d8a071SWilliam Breathitt Gray { 238aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 239f1d8a071SWilliam Breathitt Gray const int id = count->id; 24009db4678SWilliam Breathitt Gray unsigned long irqflags; 241f1d8a071SWilliam Breathitt Gray 24209db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 243fc069262SSyed Nayyar Waris 244fc069262SSyed Nayyar Waris if (priv->quadrature_mode[id]) 245fc069262SSyed Nayyar Waris switch (priv->quadrature_scale[id]) { 246f1d8a071SWilliam Breathitt Gray case 0: 247aaec1a0fSWilliam Breathitt Gray *function = COUNTER_FUNCTION_QUADRATURE_X1_A; 248f1d8a071SWilliam Breathitt Gray break; 249f1d8a071SWilliam Breathitt Gray case 1: 250aaec1a0fSWilliam Breathitt Gray *function = COUNTER_FUNCTION_QUADRATURE_X2_A; 251f1d8a071SWilliam Breathitt Gray break; 252f1d8a071SWilliam Breathitt Gray case 2: 253aaec1a0fSWilliam Breathitt Gray *function = COUNTER_FUNCTION_QUADRATURE_X4; 254f1d8a071SWilliam Breathitt Gray break; 255f1d8a071SWilliam Breathitt Gray } 256f1d8a071SWilliam Breathitt Gray else 257aaec1a0fSWilliam Breathitt Gray *function = COUNTER_FUNCTION_PULSE_DIRECTION; 258f1d8a071SWilliam Breathitt Gray 25909db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 260fc069262SSyed Nayyar Waris 261f1d8a071SWilliam Breathitt Gray return 0; 262f1d8a071SWilliam Breathitt Gray } 263f1d8a071SWilliam Breathitt Gray 264aaec1a0fSWilliam Breathitt Gray static int quad8_function_write(struct counter_device *counter, 265aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 266aaec1a0fSWilliam Breathitt Gray enum counter_function function) 267f1d8a071SWilliam Breathitt Gray { 268aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 269f1d8a071SWilliam Breathitt Gray const int id = count->id; 270f1d8a071SWilliam Breathitt Gray unsigned int *const quadrature_mode = priv->quadrature_mode + id; 271f1d8a071SWilliam Breathitt Gray unsigned int *const scale = priv->quadrature_scale + id; 272f1d8a071SWilliam Breathitt Gray unsigned int *const synchronous_mode = priv->synchronous_mode + id; 273daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[id].control; 27409db4678SWilliam Breathitt Gray unsigned long irqflags; 275fc069262SSyed Nayyar Waris unsigned int mode_cfg; 276fc069262SSyed Nayyar Waris unsigned int idr_cfg; 277fc069262SSyed Nayyar Waris 27809db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 279fc069262SSyed Nayyar Waris 280fc069262SSyed Nayyar Waris mode_cfg = priv->count_mode[id] << 1; 281fc069262SSyed Nayyar Waris idr_cfg = priv->index_polarity[id] << 1; 282f1d8a071SWilliam Breathitt Gray 283aaec1a0fSWilliam Breathitt Gray if (function == COUNTER_FUNCTION_PULSE_DIRECTION) { 284f1d8a071SWilliam Breathitt Gray *quadrature_mode = 0; 285f1d8a071SWilliam Breathitt Gray 286f1d8a071SWilliam Breathitt Gray /* Quadrature scaling only available in quadrature mode */ 287f1d8a071SWilliam Breathitt Gray *scale = 0; 288f1d8a071SWilliam Breathitt Gray 289f1d8a071SWilliam Breathitt Gray /* Synchronous function not supported in non-quadrature mode */ 290f1d8a071SWilliam Breathitt Gray if (*synchronous_mode) { 291f1d8a071SWilliam Breathitt Gray *synchronous_mode = 0; 292f1d8a071SWilliam Breathitt Gray /* Disable synchronous function mode */ 293daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IDR | idr_cfg, control); 294f1d8a071SWilliam Breathitt Gray } 295f1d8a071SWilliam Breathitt Gray } else { 296f1d8a071SWilliam Breathitt Gray *quadrature_mode = 1; 297f1d8a071SWilliam Breathitt Gray 298f1d8a071SWilliam Breathitt Gray switch (function) { 299aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X1_A: 300f1d8a071SWilliam Breathitt Gray *scale = 0; 301f1d8a071SWilliam Breathitt Gray mode_cfg |= QUAD8_CMR_QUADRATURE_X1; 302f1d8a071SWilliam Breathitt Gray break; 303aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X2_A: 304f1d8a071SWilliam Breathitt Gray *scale = 1; 305f1d8a071SWilliam Breathitt Gray mode_cfg |= QUAD8_CMR_QUADRATURE_X2; 306f1d8a071SWilliam Breathitt Gray break; 307aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X4: 308f1d8a071SWilliam Breathitt Gray *scale = 2; 309f1d8a071SWilliam Breathitt Gray mode_cfg |= QUAD8_CMR_QUADRATURE_X4; 310f1d8a071SWilliam Breathitt Gray break; 311b11eed15SWilliam Breathitt Gray default: 312b11eed15SWilliam Breathitt Gray /* should never reach this path */ 31309db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 314b11eed15SWilliam Breathitt Gray return -EINVAL; 315f1d8a071SWilliam Breathitt Gray } 316f1d8a071SWilliam Breathitt Gray } 317f1d8a071SWilliam Breathitt Gray 318f1d8a071SWilliam Breathitt Gray /* Load mode configuration to Counter Mode Register */ 319daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_CMR | mode_cfg, control); 320f1d8a071SWilliam Breathitt Gray 32109db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 322fc069262SSyed Nayyar Waris 323f1d8a071SWilliam Breathitt Gray return 0; 324f1d8a071SWilliam Breathitt Gray } 325f1d8a071SWilliam Breathitt Gray 326aaec1a0fSWilliam Breathitt Gray static int quad8_direction_read(struct counter_device *counter, 327aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 328aaec1a0fSWilliam Breathitt Gray enum counter_count_direction *direction) 329f1d8a071SWilliam Breathitt Gray { 330aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 331f1d8a071SWilliam Breathitt Gray unsigned int ud_flag; 332daae1ee5SWilliam Breathitt Gray u8 __iomem *const flag_addr = &priv->reg->channel[count->id].control; 333f1d8a071SWilliam Breathitt Gray 334f1d8a071SWilliam Breathitt Gray /* U/D flag: nonzero = up, zero = down */ 335b6e9cdedSWilliam Breathitt Gray ud_flag = ioread8(flag_addr) & QUAD8_FLAG_UD; 336f1d8a071SWilliam Breathitt Gray 337f1d8a071SWilliam Breathitt Gray *direction = (ud_flag) ? COUNTER_COUNT_DIRECTION_FORWARD : 338f1d8a071SWilliam Breathitt Gray COUNTER_COUNT_DIRECTION_BACKWARD; 339aaec1a0fSWilliam Breathitt Gray 340aaec1a0fSWilliam Breathitt Gray return 0; 341f1d8a071SWilliam Breathitt Gray } 342f1d8a071SWilliam Breathitt Gray 3436a9eb0e3SWilliam Breathitt Gray static const enum counter_synapse_action quad8_index_actions_list[] = { 344aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_NONE, 345aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_RISING_EDGE, 346f1d8a071SWilliam Breathitt Gray }; 347f1d8a071SWilliam Breathitt Gray 3486a9eb0e3SWilliam Breathitt Gray static const enum counter_synapse_action quad8_synapse_actions_list[] = { 349aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_NONE, 350aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_RISING_EDGE, 351aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_FALLING_EDGE, 352aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_BOTH_EDGES, 353f1d8a071SWilliam Breathitt Gray }; 354f1d8a071SWilliam Breathitt Gray 355aaec1a0fSWilliam Breathitt Gray static int quad8_action_read(struct counter_device *counter, 356aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 357aaec1a0fSWilliam Breathitt Gray struct counter_synapse *synapse, 358aaec1a0fSWilliam Breathitt Gray enum counter_synapse_action *action) 359f1d8a071SWilliam Breathitt Gray { 360aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 361f1d8a071SWilliam Breathitt Gray int err; 362aaec1a0fSWilliam Breathitt Gray enum counter_function function; 363f1d8a071SWilliam Breathitt Gray const size_t signal_a_id = count->synapses[0].signal->id; 364f1d8a071SWilliam Breathitt Gray enum counter_count_direction direction; 365f1d8a071SWilliam Breathitt Gray 366f1d8a071SWilliam Breathitt Gray /* Handle Index signals */ 367f1d8a071SWilliam Breathitt Gray if (synapse->signal->id >= 16) { 368f1d8a071SWilliam Breathitt Gray if (priv->preset_enable[count->id]) 369aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; 370f1d8a071SWilliam Breathitt Gray else 371aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_NONE; 372f1d8a071SWilliam Breathitt Gray 373f1d8a071SWilliam Breathitt Gray return 0; 374f1d8a071SWilliam Breathitt Gray } 375f1d8a071SWilliam Breathitt Gray 376aaec1a0fSWilliam Breathitt Gray err = quad8_function_read(counter, count, &function); 377f1d8a071SWilliam Breathitt Gray if (err) 378f1d8a071SWilliam Breathitt Gray return err; 379f1d8a071SWilliam Breathitt Gray 380f1d8a071SWilliam Breathitt Gray /* Default action mode */ 381aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_NONE; 382f1d8a071SWilliam Breathitt Gray 383f1d8a071SWilliam Breathitt Gray /* Determine action mode based on current count function mode */ 384f1d8a071SWilliam Breathitt Gray switch (function) { 385aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_PULSE_DIRECTION: 386f1d8a071SWilliam Breathitt Gray if (synapse->signal->id == signal_a_id) 387aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; 388b11eed15SWilliam Breathitt Gray return 0; 389aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X1_A: 390f1d8a071SWilliam Breathitt Gray if (synapse->signal->id == signal_a_id) { 391aaec1a0fSWilliam Breathitt Gray err = quad8_direction_read(counter, count, &direction); 392aaec1a0fSWilliam Breathitt Gray if (err) 393aaec1a0fSWilliam Breathitt Gray return err; 394f1d8a071SWilliam Breathitt Gray 395f1d8a071SWilliam Breathitt Gray if (direction == COUNTER_COUNT_DIRECTION_FORWARD) 396aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; 397f1d8a071SWilliam Breathitt Gray else 398aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE; 399f1d8a071SWilliam Breathitt Gray } 400b11eed15SWilliam Breathitt Gray return 0; 401aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X2_A: 402f1d8a071SWilliam Breathitt Gray if (synapse->signal->id == signal_a_id) 403aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; 404b11eed15SWilliam Breathitt Gray return 0; 405aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X4: 406aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; 407f1d8a071SWilliam Breathitt Gray return 0; 408b11eed15SWilliam Breathitt Gray default: 409b11eed15SWilliam Breathitt Gray /* should never reach this path */ 410b11eed15SWilliam Breathitt Gray return -EINVAL; 411b11eed15SWilliam Breathitt Gray } 412f1d8a071SWilliam Breathitt Gray } 413f1d8a071SWilliam Breathitt Gray 4147aa2ba0dSWilliam Breathitt Gray enum { 4157aa2ba0dSWilliam Breathitt Gray QUAD8_EVENT_CARRY = 0, 4167aa2ba0dSWilliam Breathitt Gray QUAD8_EVENT_COMPARE = 1, 4177aa2ba0dSWilliam Breathitt Gray QUAD8_EVENT_CARRY_BORROW = 2, 4187aa2ba0dSWilliam Breathitt Gray QUAD8_EVENT_INDEX = 3, 4197aa2ba0dSWilliam Breathitt Gray }; 4207aa2ba0dSWilliam Breathitt Gray 4217aa2ba0dSWilliam Breathitt Gray static int quad8_events_configure(struct counter_device *counter) 4227aa2ba0dSWilliam Breathitt Gray { 423aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 4247aa2ba0dSWilliam Breathitt Gray unsigned long irq_enabled = 0; 4257aa2ba0dSWilliam Breathitt Gray unsigned long irqflags; 426c95cc0d9SWilliam Breathitt Gray struct counter_event_node *event_node; 427c95cc0d9SWilliam Breathitt Gray unsigned int next_irq_trigger; 4287aa2ba0dSWilliam Breathitt Gray unsigned long ior_cfg; 4297aa2ba0dSWilliam Breathitt Gray 4307aa2ba0dSWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 4317aa2ba0dSWilliam Breathitt Gray 432c95cc0d9SWilliam Breathitt Gray list_for_each_entry(event_node, &counter->events_list, l) { 433c95cc0d9SWilliam Breathitt Gray switch (event_node->event) { 434c95cc0d9SWilliam Breathitt Gray case COUNTER_EVENT_OVERFLOW: 435c95cc0d9SWilliam Breathitt Gray next_irq_trigger = QUAD8_EVENT_CARRY; 436c95cc0d9SWilliam Breathitt Gray break; 437c95cc0d9SWilliam Breathitt Gray case COUNTER_EVENT_THRESHOLD: 438c95cc0d9SWilliam Breathitt Gray next_irq_trigger = QUAD8_EVENT_COMPARE; 439c95cc0d9SWilliam Breathitt Gray break; 440c95cc0d9SWilliam Breathitt Gray case COUNTER_EVENT_OVERFLOW_UNDERFLOW: 441c95cc0d9SWilliam Breathitt Gray next_irq_trigger = QUAD8_EVENT_CARRY_BORROW; 442c95cc0d9SWilliam Breathitt Gray break; 443c95cc0d9SWilliam Breathitt Gray case COUNTER_EVENT_INDEX: 444c95cc0d9SWilliam Breathitt Gray next_irq_trigger = QUAD8_EVENT_INDEX; 445c95cc0d9SWilliam Breathitt Gray break; 446c95cc0d9SWilliam Breathitt Gray default: 447c95cc0d9SWilliam Breathitt Gray /* should never reach this path */ 448c95cc0d9SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 449c95cc0d9SWilliam Breathitt Gray return -EINVAL; 4507aa2ba0dSWilliam Breathitt Gray } 4517aa2ba0dSWilliam Breathitt Gray 452c95cc0d9SWilliam Breathitt Gray /* Skip configuration if it is the same as previously set */ 453c95cc0d9SWilliam Breathitt Gray if (priv->irq_trigger[event_node->channel] == next_irq_trigger) 454c95cc0d9SWilliam Breathitt Gray continue; 455c95cc0d9SWilliam Breathitt Gray 456c95cc0d9SWilliam Breathitt Gray /* Save new IRQ function configuration */ 457c95cc0d9SWilliam Breathitt Gray priv->irq_trigger[event_node->channel] = next_irq_trigger; 458c95cc0d9SWilliam Breathitt Gray 459c95cc0d9SWilliam Breathitt Gray /* Load configuration to I/O Control Register */ 460c95cc0d9SWilliam Breathitt Gray ior_cfg = priv->ab_enable[event_node->channel] | 461c95cc0d9SWilliam Breathitt Gray priv->preset_enable[event_node->channel] << 1 | 462c95cc0d9SWilliam Breathitt Gray priv->irq_trigger[event_node->channel] << 3; 463daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IOR | ior_cfg, 464daae1ee5SWilliam Breathitt Gray &priv->reg->channel[event_node->channel].control); 4657aa2ba0dSWilliam Breathitt Gray 4667aa2ba0dSWilliam Breathitt Gray /* Enable IRQ line */ 467c95cc0d9SWilliam Breathitt Gray irq_enabled |= BIT(event_node->channel); 4687aa2ba0dSWilliam Breathitt Gray } 4697aa2ba0dSWilliam Breathitt Gray 470daae1ee5SWilliam Breathitt Gray iowrite8(irq_enabled, &priv->reg->index_interrupt); 4717aa2ba0dSWilliam Breathitt Gray 4727aa2ba0dSWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 4737aa2ba0dSWilliam Breathitt Gray 4747aa2ba0dSWilliam Breathitt Gray return 0; 4757aa2ba0dSWilliam Breathitt Gray } 4767aa2ba0dSWilliam Breathitt Gray 4777aa2ba0dSWilliam Breathitt Gray static int quad8_watch_validate(struct counter_device *counter, 4787aa2ba0dSWilliam Breathitt Gray const struct counter_watch *watch) 4797aa2ba0dSWilliam Breathitt Gray { 480c95cc0d9SWilliam Breathitt Gray struct counter_event_node *event_node; 4817aa2ba0dSWilliam Breathitt Gray 4827aa2ba0dSWilliam Breathitt Gray if (watch->channel > QUAD8_NUM_COUNTERS - 1) 4837aa2ba0dSWilliam Breathitt Gray return -EINVAL; 4847aa2ba0dSWilliam Breathitt Gray 4857aa2ba0dSWilliam Breathitt Gray switch (watch->event) { 4867aa2ba0dSWilliam Breathitt Gray case COUNTER_EVENT_OVERFLOW: 4877aa2ba0dSWilliam Breathitt Gray case COUNTER_EVENT_THRESHOLD: 4887aa2ba0dSWilliam Breathitt Gray case COUNTER_EVENT_OVERFLOW_UNDERFLOW: 4897aa2ba0dSWilliam Breathitt Gray case COUNTER_EVENT_INDEX: 490c95cc0d9SWilliam Breathitt Gray list_for_each_entry(event_node, &counter->next_events_list, l) 491c95cc0d9SWilliam Breathitt Gray if (watch->channel == event_node->channel && 492c95cc0d9SWilliam Breathitt Gray watch->event != event_node->event) 4937aa2ba0dSWilliam Breathitt Gray return -EINVAL; 4947aa2ba0dSWilliam Breathitt Gray return 0; 4957aa2ba0dSWilliam Breathitt Gray default: 4967aa2ba0dSWilliam Breathitt Gray return -EINVAL; 4977aa2ba0dSWilliam Breathitt Gray } 4987aa2ba0dSWilliam Breathitt Gray } 4997aa2ba0dSWilliam Breathitt Gray 50017aa207eSYueHaibing static const struct counter_ops quad8_ops = { 501f1d8a071SWilliam Breathitt Gray .signal_read = quad8_signal_read, 502f1d8a071SWilliam Breathitt Gray .count_read = quad8_count_read, 503f1d8a071SWilliam Breathitt Gray .count_write = quad8_count_write, 504aaec1a0fSWilliam Breathitt Gray .function_read = quad8_function_read, 505aaec1a0fSWilliam Breathitt Gray .function_write = quad8_function_write, 5067aa2ba0dSWilliam Breathitt Gray .action_read = quad8_action_read, 5077aa2ba0dSWilliam Breathitt Gray .events_configure = quad8_events_configure, 5087aa2ba0dSWilliam Breathitt Gray .watch_validate = quad8_watch_validate, 509f1d8a071SWilliam Breathitt Gray }; 510f1d8a071SWilliam Breathitt Gray 511e357e81fSWilliam Breathitt Gray static const char *const quad8_index_polarity_modes[] = { 512e357e81fSWilliam Breathitt Gray "negative", 513e357e81fSWilliam Breathitt Gray "positive" 514e357e81fSWilliam Breathitt Gray }; 515e357e81fSWilliam Breathitt Gray 516f1d8a071SWilliam Breathitt Gray static int quad8_index_polarity_get(struct counter_device *counter, 517aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 518aaec1a0fSWilliam Breathitt Gray u32 *index_polarity) 519f1d8a071SWilliam Breathitt Gray { 520aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 521f1d8a071SWilliam Breathitt Gray const size_t channel_id = signal->id - 16; 522f1d8a071SWilliam Breathitt Gray 523f1d8a071SWilliam Breathitt Gray *index_polarity = priv->index_polarity[channel_id]; 524f1d8a071SWilliam Breathitt Gray 525f1d8a071SWilliam Breathitt Gray return 0; 526f1d8a071SWilliam Breathitt Gray } 527f1d8a071SWilliam Breathitt Gray 528f1d8a071SWilliam Breathitt Gray static int quad8_index_polarity_set(struct counter_device *counter, 529aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 530aaec1a0fSWilliam Breathitt Gray u32 index_polarity) 531f1d8a071SWilliam Breathitt Gray { 532aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 533f1d8a071SWilliam Breathitt Gray const size_t channel_id = signal->id - 16; 534daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[channel_id].control; 53509db4678SWilliam Breathitt Gray unsigned long irqflags; 536fc069262SSyed Nayyar Waris unsigned int idr_cfg = index_polarity << 1; 537fc069262SSyed Nayyar Waris 53809db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 539fc069262SSyed Nayyar Waris 540fc069262SSyed Nayyar Waris idr_cfg |= priv->synchronous_mode[channel_id]; 541f1d8a071SWilliam Breathitt Gray 542f1d8a071SWilliam Breathitt Gray priv->index_polarity[channel_id] = index_polarity; 543f1d8a071SWilliam Breathitt Gray 544f1d8a071SWilliam Breathitt Gray /* Load Index Control configuration to Index Control Register */ 545daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IDR | idr_cfg, control); 546f1d8a071SWilliam Breathitt Gray 54709db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 548fc069262SSyed Nayyar Waris 549f1d8a071SWilliam Breathitt Gray return 0; 550f1d8a071SWilliam Breathitt Gray } 551f1d8a071SWilliam Breathitt Gray 552e357e81fSWilliam Breathitt Gray static const char *const quad8_synchronous_modes[] = { 553e357e81fSWilliam Breathitt Gray "non-synchronous", 554e357e81fSWilliam Breathitt Gray "synchronous" 555e357e81fSWilliam Breathitt Gray }; 556e357e81fSWilliam Breathitt Gray 557f1d8a071SWilliam Breathitt Gray static int quad8_synchronous_mode_get(struct counter_device *counter, 558aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 559aaec1a0fSWilliam Breathitt Gray u32 *synchronous_mode) 560f1d8a071SWilliam Breathitt Gray { 561aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 562f1d8a071SWilliam Breathitt Gray const size_t channel_id = signal->id - 16; 563f1d8a071SWilliam Breathitt Gray 564f1d8a071SWilliam Breathitt Gray *synchronous_mode = priv->synchronous_mode[channel_id]; 565f1d8a071SWilliam Breathitt Gray 566f1d8a071SWilliam Breathitt Gray return 0; 567f1d8a071SWilliam Breathitt Gray } 568f1d8a071SWilliam Breathitt Gray 569f1d8a071SWilliam Breathitt Gray static int quad8_synchronous_mode_set(struct counter_device *counter, 570aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 571aaec1a0fSWilliam Breathitt Gray u32 synchronous_mode) 572f1d8a071SWilliam Breathitt Gray { 573aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 574f1d8a071SWilliam Breathitt Gray const size_t channel_id = signal->id - 16; 575daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[channel_id].control; 57609db4678SWilliam Breathitt Gray unsigned long irqflags; 577fc069262SSyed Nayyar Waris unsigned int idr_cfg = synchronous_mode; 578fc069262SSyed Nayyar Waris 57909db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 580fc069262SSyed Nayyar Waris 581fc069262SSyed Nayyar Waris idr_cfg |= priv->index_polarity[channel_id] << 1; 582f1d8a071SWilliam Breathitt Gray 583f1d8a071SWilliam Breathitt Gray /* Index function must be non-synchronous in non-quadrature mode */ 584fc069262SSyed Nayyar Waris if (synchronous_mode && !priv->quadrature_mode[channel_id]) { 58509db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 586f1d8a071SWilliam Breathitt Gray return -EINVAL; 587fc069262SSyed Nayyar Waris } 588f1d8a071SWilliam Breathitt Gray 589f1d8a071SWilliam Breathitt Gray priv->synchronous_mode[channel_id] = synchronous_mode; 590f1d8a071SWilliam Breathitt Gray 591f1d8a071SWilliam Breathitt Gray /* Load Index Control configuration to Index Control Register */ 592daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IDR | idr_cfg, control); 593f1d8a071SWilliam Breathitt Gray 59409db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 595fc069262SSyed Nayyar Waris 596f1d8a071SWilliam Breathitt Gray return 0; 597f1d8a071SWilliam Breathitt Gray } 598f1d8a071SWilliam Breathitt Gray 599aaec1a0fSWilliam Breathitt Gray static int quad8_count_floor_read(struct counter_device *counter, 600aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 *floor) 601f1d8a071SWilliam Breathitt Gray { 602f1d8a071SWilliam Breathitt Gray /* Only a floor of 0 is supported */ 603aaec1a0fSWilliam Breathitt Gray *floor = 0; 604aaec1a0fSWilliam Breathitt Gray 605aaec1a0fSWilliam Breathitt Gray return 0; 606f1d8a071SWilliam Breathitt Gray } 607f1d8a071SWilliam Breathitt Gray 608aaec1a0fSWilliam Breathitt Gray static int quad8_count_mode_read(struct counter_device *counter, 609aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 610aaec1a0fSWilliam Breathitt Gray enum counter_count_mode *cnt_mode) 611f1d8a071SWilliam Breathitt Gray { 612aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 613f1d8a071SWilliam Breathitt Gray 614f1d8a071SWilliam Breathitt Gray /* Map 104-QUAD-8 count mode to Generic Counter count mode */ 615f1d8a071SWilliam Breathitt Gray switch (priv->count_mode[count->id]) { 616f1d8a071SWilliam Breathitt Gray case 0: 617f1d8a071SWilliam Breathitt Gray *cnt_mode = COUNTER_COUNT_MODE_NORMAL; 618f1d8a071SWilliam Breathitt Gray break; 619f1d8a071SWilliam Breathitt Gray case 1: 620f1d8a071SWilliam Breathitt Gray *cnt_mode = COUNTER_COUNT_MODE_RANGE_LIMIT; 621f1d8a071SWilliam Breathitt Gray break; 622f1d8a071SWilliam Breathitt Gray case 2: 623f1d8a071SWilliam Breathitt Gray *cnt_mode = COUNTER_COUNT_MODE_NON_RECYCLE; 624f1d8a071SWilliam Breathitt Gray break; 625f1d8a071SWilliam Breathitt Gray case 3: 626f1d8a071SWilliam Breathitt Gray *cnt_mode = COUNTER_COUNT_MODE_MODULO_N; 627f1d8a071SWilliam Breathitt Gray break; 628f1d8a071SWilliam Breathitt Gray } 629f1d8a071SWilliam Breathitt Gray 630f1d8a071SWilliam Breathitt Gray return 0; 631f1d8a071SWilliam Breathitt Gray } 632f1d8a071SWilliam Breathitt Gray 633aaec1a0fSWilliam Breathitt Gray static int quad8_count_mode_write(struct counter_device *counter, 634aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 635aaec1a0fSWilliam Breathitt Gray enum counter_count_mode cnt_mode) 636f1d8a071SWilliam Breathitt Gray { 637aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 638aaec1a0fSWilliam Breathitt Gray unsigned int count_mode; 639f1d8a071SWilliam Breathitt Gray unsigned int mode_cfg; 640daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[count->id].control; 64109db4678SWilliam Breathitt Gray unsigned long irqflags; 642f1d8a071SWilliam Breathitt Gray 643f1d8a071SWilliam Breathitt Gray /* Map Generic Counter count mode to 104-QUAD-8 count mode */ 644f1d8a071SWilliam Breathitt Gray switch (cnt_mode) { 645f1d8a071SWilliam Breathitt Gray case COUNTER_COUNT_MODE_NORMAL: 646aaec1a0fSWilliam Breathitt Gray count_mode = 0; 647f1d8a071SWilliam Breathitt Gray break; 648f1d8a071SWilliam Breathitt Gray case COUNTER_COUNT_MODE_RANGE_LIMIT: 649aaec1a0fSWilliam Breathitt Gray count_mode = 1; 650f1d8a071SWilliam Breathitt Gray break; 651f1d8a071SWilliam Breathitt Gray case COUNTER_COUNT_MODE_NON_RECYCLE: 652aaec1a0fSWilliam Breathitt Gray count_mode = 2; 653f1d8a071SWilliam Breathitt Gray break; 654f1d8a071SWilliam Breathitt Gray case COUNTER_COUNT_MODE_MODULO_N: 655aaec1a0fSWilliam Breathitt Gray count_mode = 3; 656f1d8a071SWilliam Breathitt Gray break; 657b11eed15SWilliam Breathitt Gray default: 658b11eed15SWilliam Breathitt Gray /* should never reach this path */ 659b11eed15SWilliam Breathitt Gray return -EINVAL; 660f1d8a071SWilliam Breathitt Gray } 661f1d8a071SWilliam Breathitt Gray 66209db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 663fc069262SSyed Nayyar Waris 664aaec1a0fSWilliam Breathitt Gray priv->count_mode[count->id] = count_mode; 665f1d8a071SWilliam Breathitt Gray 666f1d8a071SWilliam Breathitt Gray /* Set count mode configuration value */ 667aaec1a0fSWilliam Breathitt Gray mode_cfg = count_mode << 1; 668f1d8a071SWilliam Breathitt Gray 669f1d8a071SWilliam Breathitt Gray /* Add quadrature mode configuration */ 670f1d8a071SWilliam Breathitt Gray if (priv->quadrature_mode[count->id]) 671f1d8a071SWilliam Breathitt Gray mode_cfg |= (priv->quadrature_scale[count->id] + 1) << 3; 672f1d8a071SWilliam Breathitt Gray 673f1d8a071SWilliam Breathitt Gray /* Load mode configuration to Counter Mode Register */ 674daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_CMR | mode_cfg, control); 675f1d8a071SWilliam Breathitt Gray 67609db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 677fc069262SSyed Nayyar Waris 678f1d8a071SWilliam Breathitt Gray return 0; 679f1d8a071SWilliam Breathitt Gray } 680f1d8a071SWilliam Breathitt Gray 681aaec1a0fSWilliam Breathitt Gray static int quad8_count_enable_read(struct counter_device *counter, 682aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u8 *enable) 683f1d8a071SWilliam Breathitt Gray { 684aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 685f1d8a071SWilliam Breathitt Gray 686aaec1a0fSWilliam Breathitt Gray *enable = priv->ab_enable[count->id]; 687aaec1a0fSWilliam Breathitt Gray 688aaec1a0fSWilliam Breathitt Gray return 0; 689f1d8a071SWilliam Breathitt Gray } 690f1d8a071SWilliam Breathitt Gray 691aaec1a0fSWilliam Breathitt Gray static int quad8_count_enable_write(struct counter_device *counter, 692aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u8 enable) 693f1d8a071SWilliam Breathitt Gray { 694aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 695daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[count->id].control; 69609db4678SWilliam Breathitt Gray unsigned long irqflags; 697f1d8a071SWilliam Breathitt Gray unsigned int ior_cfg; 698f1d8a071SWilliam Breathitt Gray 69909db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 700fc069262SSyed Nayyar Waris 701aaec1a0fSWilliam Breathitt Gray priv->ab_enable[count->id] = enable; 702f1d8a071SWilliam Breathitt Gray 7037aa2ba0dSWilliam Breathitt Gray ior_cfg = enable | priv->preset_enable[count->id] << 1 | 7047aa2ba0dSWilliam Breathitt Gray priv->irq_trigger[count->id] << 3; 705f1d8a071SWilliam Breathitt Gray 706f1d8a071SWilliam Breathitt Gray /* Load I/O control configuration */ 707daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IOR | ior_cfg, control); 708f1d8a071SWilliam Breathitt Gray 70909db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 710fc069262SSyed Nayyar Waris 711aaec1a0fSWilliam Breathitt Gray return 0; 712f1d8a071SWilliam Breathitt Gray } 713f1d8a071SWilliam Breathitt Gray 714e357e81fSWilliam Breathitt Gray static const char *const quad8_noise_error_states[] = { 715e357e81fSWilliam Breathitt Gray "No excessive noise is present at the count inputs", 716e357e81fSWilliam Breathitt Gray "Excessive noise is present at the count inputs" 717e357e81fSWilliam Breathitt Gray }; 718e357e81fSWilliam Breathitt Gray 719f1d8a071SWilliam Breathitt Gray static int quad8_error_noise_get(struct counter_device *counter, 720aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u32 *noise_error) 721f1d8a071SWilliam Breathitt Gray { 722aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 723daae1ee5SWilliam Breathitt Gray u8 __iomem *const flag_addr = &priv->reg->channel[count->id].control; 724f1d8a071SWilliam Breathitt Gray 725daae1ee5SWilliam Breathitt Gray *noise_error = !!(ioread8(flag_addr) & QUAD8_FLAG_E); 726f1d8a071SWilliam Breathitt Gray 727f1d8a071SWilliam Breathitt Gray return 0; 728f1d8a071SWilliam Breathitt Gray } 729f1d8a071SWilliam Breathitt Gray 730aaec1a0fSWilliam Breathitt Gray static int quad8_count_preset_read(struct counter_device *counter, 731aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 *preset) 732f1d8a071SWilliam Breathitt Gray { 733aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 734f1d8a071SWilliam Breathitt Gray 735aaec1a0fSWilliam Breathitt Gray *preset = priv->preset[count->id]; 736aaec1a0fSWilliam Breathitt Gray 737aaec1a0fSWilliam Breathitt Gray return 0; 738f1d8a071SWilliam Breathitt Gray } 739f1d8a071SWilliam Breathitt Gray 740e612b600SWilliam Breathitt Gray static void quad8_preset_register_set(struct quad8 *const priv, const int id, 741e612b600SWilliam Breathitt Gray const unsigned int preset) 742fc069262SSyed Nayyar Waris { 743daae1ee5SWilliam Breathitt Gray struct channel_reg __iomem *const chan = priv->reg->channel + id; 744fc069262SSyed Nayyar Waris int i; 745fc069262SSyed Nayyar Waris 746e357e81fSWilliam Breathitt Gray priv->preset[id] = preset; 747fc069262SSyed Nayyar Waris 748fc069262SSyed Nayyar Waris /* Reset Byte Pointer */ 749daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 750fc069262SSyed Nayyar Waris 751fc069262SSyed Nayyar Waris /* Set Preset Register */ 752fc069262SSyed Nayyar Waris for (i = 0; i < 3; i++) 753daae1ee5SWilliam Breathitt Gray iowrite8(preset >> (8 * i), &chan->data); 754fc069262SSyed Nayyar Waris } 755fc069262SSyed Nayyar Waris 756aaec1a0fSWilliam Breathitt Gray static int quad8_count_preset_write(struct counter_device *counter, 757aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 preset) 758f1d8a071SWilliam Breathitt Gray { 759aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 76009db4678SWilliam Breathitt Gray unsigned long irqflags; 761f1d8a071SWilliam Breathitt Gray 762f1d8a071SWilliam Breathitt Gray /* Only 24-bit values are supported */ 763f1d8a071SWilliam Breathitt Gray if (preset > 0xFFFFFF) 764e2ff3198SWilliam Breathitt Gray return -ERANGE; 765f1d8a071SWilliam Breathitt Gray 76609db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 767f1d8a071SWilliam Breathitt Gray 768fc069262SSyed Nayyar Waris quad8_preset_register_set(priv, count->id, preset); 769f1d8a071SWilliam Breathitt Gray 77009db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 771f1d8a071SWilliam Breathitt Gray 772aaec1a0fSWilliam Breathitt Gray return 0; 773f1d8a071SWilliam Breathitt Gray } 774f1d8a071SWilliam Breathitt Gray 775aaec1a0fSWilliam Breathitt Gray static int quad8_count_ceiling_read(struct counter_device *counter, 776aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 *ceiling) 777f1d8a071SWilliam Breathitt Gray { 778aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 77909db4678SWilliam Breathitt Gray unsigned long irqflags; 780fc069262SSyed Nayyar Waris 78109db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 782f1d8a071SWilliam Breathitt Gray 783f1d8a071SWilliam Breathitt Gray /* Range Limit and Modulo-N count modes use preset value as ceiling */ 784f1d8a071SWilliam Breathitt Gray switch (priv->count_mode[count->id]) { 785f1d8a071SWilliam Breathitt Gray case 1: 786f1d8a071SWilliam Breathitt Gray case 3: 787aaec1a0fSWilliam Breathitt Gray *ceiling = priv->preset[count->id]; 788aaec1a0fSWilliam Breathitt Gray break; 789aaec1a0fSWilliam Breathitt Gray default: 790f1d8a071SWilliam Breathitt Gray /* By default 0x1FFFFFF (25 bits unsigned) is maximum count */ 791aaec1a0fSWilliam Breathitt Gray *ceiling = 0x1FFFFFF; 792aaec1a0fSWilliam Breathitt Gray break; 793f1d8a071SWilliam Breathitt Gray } 794f1d8a071SWilliam Breathitt Gray 79509db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 796aaec1a0fSWilliam Breathitt Gray 797aaec1a0fSWilliam Breathitt Gray return 0; 798aaec1a0fSWilliam Breathitt Gray } 799aaec1a0fSWilliam Breathitt Gray 800aaec1a0fSWilliam Breathitt Gray static int quad8_count_ceiling_write(struct counter_device *counter, 801aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 ceiling) 802f1d8a071SWilliam Breathitt Gray { 803aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 80409db4678SWilliam Breathitt Gray unsigned long irqflags; 805fc069262SSyed Nayyar Waris 806fc069262SSyed Nayyar Waris /* Only 24-bit values are supported */ 807fc069262SSyed Nayyar Waris if (ceiling > 0xFFFFFF) 808e2ff3198SWilliam Breathitt Gray return -ERANGE; 809fc069262SSyed Nayyar Waris 81009db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 811f1d8a071SWilliam Breathitt Gray 812f1d8a071SWilliam Breathitt Gray /* Range Limit and Modulo-N count modes use preset value as ceiling */ 813f1d8a071SWilliam Breathitt Gray switch (priv->count_mode[count->id]) { 814f1d8a071SWilliam Breathitt Gray case 1: 815f1d8a071SWilliam Breathitt Gray case 3: 816fc069262SSyed Nayyar Waris quad8_preset_register_set(priv, count->id, ceiling); 81709db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 818aaec1a0fSWilliam Breathitt Gray return 0; 819f1d8a071SWilliam Breathitt Gray } 820f1d8a071SWilliam Breathitt Gray 82109db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 822fc069262SSyed Nayyar Waris 823728246e8SWilliam Breathitt Gray return -EINVAL; 824f1d8a071SWilliam Breathitt Gray } 825f1d8a071SWilliam Breathitt Gray 826aaec1a0fSWilliam Breathitt Gray static int quad8_count_preset_enable_read(struct counter_device *counter, 827aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 828aaec1a0fSWilliam Breathitt Gray u8 *preset_enable) 829f1d8a071SWilliam Breathitt Gray { 830aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 831f1d8a071SWilliam Breathitt Gray 832aaec1a0fSWilliam Breathitt Gray *preset_enable = !priv->preset_enable[count->id]; 833aaec1a0fSWilliam Breathitt Gray 834aaec1a0fSWilliam Breathitt Gray return 0; 835f1d8a071SWilliam Breathitt Gray } 836f1d8a071SWilliam Breathitt Gray 837aaec1a0fSWilliam Breathitt Gray static int quad8_count_preset_enable_write(struct counter_device *counter, 838aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 839aaec1a0fSWilliam Breathitt Gray u8 preset_enable) 840f1d8a071SWilliam Breathitt Gray { 841aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 842daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[count->id].control; 84309db4678SWilliam Breathitt Gray unsigned long irqflags; 844f1d8a071SWilliam Breathitt Gray unsigned int ior_cfg; 845f1d8a071SWilliam Breathitt Gray 846f1d8a071SWilliam Breathitt Gray /* Preset enable is active low in Input/Output Control register */ 847f1d8a071SWilliam Breathitt Gray preset_enable = !preset_enable; 848f1d8a071SWilliam Breathitt Gray 84909db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 850fc069262SSyed Nayyar Waris 851f1d8a071SWilliam Breathitt Gray priv->preset_enable[count->id] = preset_enable; 852f1d8a071SWilliam Breathitt Gray 8537aa2ba0dSWilliam Breathitt Gray ior_cfg = priv->ab_enable[count->id] | preset_enable << 1 | 8547aa2ba0dSWilliam Breathitt Gray priv->irq_trigger[count->id] << 3; 855f1d8a071SWilliam Breathitt Gray 856f1d8a071SWilliam Breathitt Gray /* Load I/O control configuration to Input / Output Control Register */ 857daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IOR | ior_cfg, control); 858f1d8a071SWilliam Breathitt Gray 85909db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 860fc069262SSyed Nayyar Waris 861aaec1a0fSWilliam Breathitt Gray return 0; 862f1d8a071SWilliam Breathitt Gray } 863f1d8a071SWilliam Breathitt Gray 864aaec1a0fSWilliam Breathitt Gray static int quad8_signal_cable_fault_read(struct counter_device *counter, 865954ab5ccSWilliam Breathitt Gray struct counter_signal *signal, 866aaec1a0fSWilliam Breathitt Gray u8 *cable_fault) 867954ab5ccSWilliam Breathitt Gray { 868aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 869954ab5ccSWilliam Breathitt Gray const size_t channel_id = signal->id / 2; 87009db4678SWilliam Breathitt Gray unsigned long irqflags; 871708d9893SSyed Nayyar Waris bool disabled; 872954ab5ccSWilliam Breathitt Gray unsigned int status; 873954ab5ccSWilliam Breathitt Gray 87409db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 875708d9893SSyed Nayyar Waris 876708d9893SSyed Nayyar Waris disabled = !(priv->cable_fault_enable & BIT(channel_id)); 877708d9893SSyed Nayyar Waris 878708d9893SSyed Nayyar Waris if (disabled) { 87909db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 880954ab5ccSWilliam Breathitt Gray return -EINVAL; 881708d9893SSyed Nayyar Waris } 882954ab5ccSWilliam Breathitt Gray 883954ab5ccSWilliam Breathitt Gray /* Logic 0 = cable fault */ 884daae1ee5SWilliam Breathitt Gray status = ioread8(&priv->reg->cable_status); 885954ab5ccSWilliam Breathitt Gray 88609db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 887708d9893SSyed Nayyar Waris 888954ab5ccSWilliam Breathitt Gray /* Mask respective channel and invert logic */ 889aaec1a0fSWilliam Breathitt Gray *cable_fault = !(status & BIT(channel_id)); 890954ab5ccSWilliam Breathitt Gray 891aaec1a0fSWilliam Breathitt Gray return 0; 892954ab5ccSWilliam Breathitt Gray } 893954ab5ccSWilliam Breathitt Gray 894aaec1a0fSWilliam Breathitt Gray static int quad8_signal_cable_fault_enable_read(struct counter_device *counter, 895aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 896aaec1a0fSWilliam Breathitt Gray u8 *enable) 897954ab5ccSWilliam Breathitt Gray { 898aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 899954ab5ccSWilliam Breathitt Gray const size_t channel_id = signal->id / 2; 900954ab5ccSWilliam Breathitt Gray 901aaec1a0fSWilliam Breathitt Gray *enable = !!(priv->cable_fault_enable & BIT(channel_id)); 902aaec1a0fSWilliam Breathitt Gray 903aaec1a0fSWilliam Breathitt Gray return 0; 904954ab5ccSWilliam Breathitt Gray } 905954ab5ccSWilliam Breathitt Gray 906aaec1a0fSWilliam Breathitt Gray static int quad8_signal_cable_fault_enable_write(struct counter_device *counter, 907aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 908aaec1a0fSWilliam Breathitt Gray u8 enable) 909954ab5ccSWilliam Breathitt Gray { 910aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 911954ab5ccSWilliam Breathitt Gray const size_t channel_id = signal->id / 2; 91209db4678SWilliam Breathitt Gray unsigned long irqflags; 913954ab5ccSWilliam Breathitt Gray unsigned int cable_fault_enable; 914954ab5ccSWilliam Breathitt Gray 91509db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 916708d9893SSyed Nayyar Waris 917954ab5ccSWilliam Breathitt Gray if (enable) 918954ab5ccSWilliam Breathitt Gray priv->cable_fault_enable |= BIT(channel_id); 919954ab5ccSWilliam Breathitt Gray else 920954ab5ccSWilliam Breathitt Gray priv->cable_fault_enable &= ~BIT(channel_id); 921954ab5ccSWilliam Breathitt Gray 922954ab5ccSWilliam Breathitt Gray /* Enable is active low in Differential Encoder Cable Status register */ 923954ab5ccSWilliam Breathitt Gray cable_fault_enable = ~priv->cable_fault_enable; 924954ab5ccSWilliam Breathitt Gray 925daae1ee5SWilliam Breathitt Gray iowrite8(cable_fault_enable, &priv->reg->cable_status); 926954ab5ccSWilliam Breathitt Gray 92709db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 928708d9893SSyed Nayyar Waris 929aaec1a0fSWilliam Breathitt Gray return 0; 930954ab5ccSWilliam Breathitt Gray } 931954ab5ccSWilliam Breathitt Gray 932aaec1a0fSWilliam Breathitt Gray static int quad8_signal_fck_prescaler_read(struct counter_device *counter, 933aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 934aaec1a0fSWilliam Breathitt Gray u8 *prescaler) 935de65d055SWilliam Breathitt Gray { 936aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 937de65d055SWilliam Breathitt Gray 938aaec1a0fSWilliam Breathitt Gray *prescaler = priv->fck_prescaler[signal->id / 2]; 939aaec1a0fSWilliam Breathitt Gray 940aaec1a0fSWilliam Breathitt Gray return 0; 941de65d055SWilliam Breathitt Gray } 942de65d055SWilliam Breathitt Gray 943aaec1a0fSWilliam Breathitt Gray static int quad8_signal_fck_prescaler_write(struct counter_device *counter, 944aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 945aaec1a0fSWilliam Breathitt Gray u8 prescaler) 946de65d055SWilliam Breathitt Gray { 947aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 948de65d055SWilliam Breathitt Gray const size_t channel_id = signal->id / 2; 949daae1ee5SWilliam Breathitt Gray struct channel_reg __iomem *const chan = priv->reg->channel + channel_id; 95009db4678SWilliam Breathitt Gray unsigned long irqflags; 951de65d055SWilliam Breathitt Gray 95209db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 953d5ed76adSSyed Nayyar Waris 954de65d055SWilliam Breathitt Gray priv->fck_prescaler[channel_id] = prescaler; 955de65d055SWilliam Breathitt Gray 956de65d055SWilliam Breathitt Gray /* Reset Byte Pointer */ 957daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 958de65d055SWilliam Breathitt Gray 959de65d055SWilliam Breathitt Gray /* Set filter clock factor */ 960daae1ee5SWilliam Breathitt Gray iowrite8(prescaler, &chan->data); 961b6e9cdedSWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, 962daae1ee5SWilliam Breathitt Gray &chan->control); 963de65d055SWilliam Breathitt Gray 96409db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 965d5ed76adSSyed Nayyar Waris 966aaec1a0fSWilliam Breathitt Gray return 0; 967de65d055SWilliam Breathitt Gray } 968de65d055SWilliam Breathitt Gray 969aaec1a0fSWilliam Breathitt Gray static struct counter_comp quad8_signal_ext[] = { 970aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_BOOL("cable_fault", quad8_signal_cable_fault_read, 971aaec1a0fSWilliam Breathitt Gray NULL), 972aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_BOOL("cable_fault_enable", 973aaec1a0fSWilliam Breathitt Gray quad8_signal_cable_fault_enable_read, 974aaec1a0fSWilliam Breathitt Gray quad8_signal_cable_fault_enable_write), 975aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_U8("filter_clock_prescaler", 976aaec1a0fSWilliam Breathitt Gray quad8_signal_fck_prescaler_read, 977aaec1a0fSWilliam Breathitt Gray quad8_signal_fck_prescaler_write) 978de65d055SWilliam Breathitt Gray }; 979de65d055SWilliam Breathitt Gray 980aaec1a0fSWilliam Breathitt Gray static DEFINE_COUNTER_ENUM(quad8_index_pol_enum, quad8_index_polarity_modes); 981aaec1a0fSWilliam Breathitt Gray static DEFINE_COUNTER_ENUM(quad8_synch_mode_enum, quad8_synchronous_modes); 982aaec1a0fSWilliam Breathitt Gray 983aaec1a0fSWilliam Breathitt Gray static struct counter_comp quad8_index_ext[] = { 984aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_ENUM("index_polarity", quad8_index_polarity_get, 985aaec1a0fSWilliam Breathitt Gray quad8_index_polarity_set, 986aaec1a0fSWilliam Breathitt Gray quad8_index_pol_enum), 987aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_ENUM("synchronous_mode", quad8_synchronous_mode_get, 988aaec1a0fSWilliam Breathitt Gray quad8_synchronous_mode_set, 989aaec1a0fSWilliam Breathitt Gray quad8_synch_mode_enum), 990f1d8a071SWilliam Breathitt Gray }; 991f1d8a071SWilliam Breathitt Gray 992f1d8a071SWilliam Breathitt Gray #define QUAD8_QUAD_SIGNAL(_id, _name) { \ 993f1d8a071SWilliam Breathitt Gray .id = (_id), \ 994de65d055SWilliam Breathitt Gray .name = (_name), \ 995de65d055SWilliam Breathitt Gray .ext = quad8_signal_ext, \ 996de65d055SWilliam Breathitt Gray .num_ext = ARRAY_SIZE(quad8_signal_ext) \ 997f1d8a071SWilliam Breathitt Gray } 998f1d8a071SWilliam Breathitt Gray 999f1d8a071SWilliam Breathitt Gray #define QUAD8_INDEX_SIGNAL(_id, _name) { \ 1000f1d8a071SWilliam Breathitt Gray .id = (_id), \ 1001f1d8a071SWilliam Breathitt Gray .name = (_name), \ 1002f1d8a071SWilliam Breathitt Gray .ext = quad8_index_ext, \ 1003f1d8a071SWilliam Breathitt Gray .num_ext = ARRAY_SIZE(quad8_index_ext) \ 1004f1d8a071SWilliam Breathitt Gray } 1005f1d8a071SWilliam Breathitt Gray 1006f1d8a071SWilliam Breathitt Gray static struct counter_signal quad8_signals[] = { 1007f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(0, "Channel 1 Quadrature A"), 1008f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(1, "Channel 1 Quadrature B"), 1009f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(2, "Channel 2 Quadrature A"), 1010f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(3, "Channel 2 Quadrature B"), 1011f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(4, "Channel 3 Quadrature A"), 1012f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(5, "Channel 3 Quadrature B"), 1013f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(6, "Channel 4 Quadrature A"), 1014f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(7, "Channel 4 Quadrature B"), 1015f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(8, "Channel 5 Quadrature A"), 1016f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(9, "Channel 5 Quadrature B"), 1017f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(10, "Channel 6 Quadrature A"), 1018f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(11, "Channel 6 Quadrature B"), 1019f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(12, "Channel 7 Quadrature A"), 1020f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(13, "Channel 7 Quadrature B"), 1021f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(14, "Channel 8 Quadrature A"), 1022f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(15, "Channel 8 Quadrature B"), 1023f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(16, "Channel 1 Index"), 1024f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(17, "Channel 2 Index"), 1025f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(18, "Channel 3 Index"), 1026f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(19, "Channel 4 Index"), 1027f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(20, "Channel 5 Index"), 1028f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(21, "Channel 6 Index"), 1029f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(22, "Channel 7 Index"), 1030f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(23, "Channel 8 Index") 1031f1d8a071SWilliam Breathitt Gray }; 1032f1d8a071SWilliam Breathitt Gray 1033f1d8a071SWilliam Breathitt Gray #define QUAD8_COUNT_SYNAPSES(_id) { \ 1034f1d8a071SWilliam Breathitt Gray { \ 1035f1d8a071SWilliam Breathitt Gray .actions_list = quad8_synapse_actions_list, \ 1036f1d8a071SWilliam Breathitt Gray .num_actions = ARRAY_SIZE(quad8_synapse_actions_list), \ 1037f1d8a071SWilliam Breathitt Gray .signal = quad8_signals + 2 * (_id) \ 1038f1d8a071SWilliam Breathitt Gray }, \ 1039f1d8a071SWilliam Breathitt Gray { \ 1040f1d8a071SWilliam Breathitt Gray .actions_list = quad8_synapse_actions_list, \ 1041f1d8a071SWilliam Breathitt Gray .num_actions = ARRAY_SIZE(quad8_synapse_actions_list), \ 1042f1d8a071SWilliam Breathitt Gray .signal = quad8_signals + 2 * (_id) + 1 \ 1043f1d8a071SWilliam Breathitt Gray }, \ 1044f1d8a071SWilliam Breathitt Gray { \ 1045f1d8a071SWilliam Breathitt Gray .actions_list = quad8_index_actions_list, \ 1046f1d8a071SWilliam Breathitt Gray .num_actions = ARRAY_SIZE(quad8_index_actions_list), \ 1047f1d8a071SWilliam Breathitt Gray .signal = quad8_signals + 2 * (_id) + 16 \ 1048f1d8a071SWilliam Breathitt Gray } \ 1049f1d8a071SWilliam Breathitt Gray } 1050f1d8a071SWilliam Breathitt Gray 1051f1d8a071SWilliam Breathitt Gray static struct counter_synapse quad8_count_synapses[][3] = { 1052f1d8a071SWilliam Breathitt Gray QUAD8_COUNT_SYNAPSES(0), QUAD8_COUNT_SYNAPSES(1), 1053f1d8a071SWilliam Breathitt Gray QUAD8_COUNT_SYNAPSES(2), QUAD8_COUNT_SYNAPSES(3), 1054f1d8a071SWilliam Breathitt Gray QUAD8_COUNT_SYNAPSES(4), QUAD8_COUNT_SYNAPSES(5), 1055f1d8a071SWilliam Breathitt Gray QUAD8_COUNT_SYNAPSES(6), QUAD8_COUNT_SYNAPSES(7) 1056f1d8a071SWilliam Breathitt Gray }; 1057f1d8a071SWilliam Breathitt Gray 1058aaec1a0fSWilliam Breathitt Gray static const enum counter_count_mode quad8_cnt_modes[] = { 1059aaec1a0fSWilliam Breathitt Gray COUNTER_COUNT_MODE_NORMAL, 1060aaec1a0fSWilliam Breathitt Gray COUNTER_COUNT_MODE_RANGE_LIMIT, 1061aaec1a0fSWilliam Breathitt Gray COUNTER_COUNT_MODE_NON_RECYCLE, 1062aaec1a0fSWilliam Breathitt Gray COUNTER_COUNT_MODE_MODULO_N, 1063aaec1a0fSWilliam Breathitt Gray }; 1064aaec1a0fSWilliam Breathitt Gray 1065aaec1a0fSWilliam Breathitt Gray static DEFINE_COUNTER_AVAILABLE(quad8_count_mode_available, quad8_cnt_modes); 1066aaec1a0fSWilliam Breathitt Gray 1067aaec1a0fSWilliam Breathitt Gray static DEFINE_COUNTER_ENUM(quad8_error_noise_enum, quad8_noise_error_states); 1068aaec1a0fSWilliam Breathitt Gray 1069aaec1a0fSWilliam Breathitt Gray static struct counter_comp quad8_count_ext[] = { 1070aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_CEILING(quad8_count_ceiling_read, 1071aaec1a0fSWilliam Breathitt Gray quad8_count_ceiling_write), 1072aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_FLOOR(quad8_count_floor_read, NULL), 1073aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_COUNT_MODE(quad8_count_mode_read, quad8_count_mode_write, 1074aaec1a0fSWilliam Breathitt Gray quad8_count_mode_available), 1075aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_DIRECTION(quad8_direction_read), 1076aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_ENABLE(quad8_count_enable_read, quad8_count_enable_write), 1077aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_COUNT_ENUM("error_noise", quad8_error_noise_get, NULL, 1078aaec1a0fSWilliam Breathitt Gray quad8_error_noise_enum), 1079aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_PRESET(quad8_count_preset_read, quad8_count_preset_write), 1080aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_PRESET_ENABLE(quad8_count_preset_enable_read, 1081aaec1a0fSWilliam Breathitt Gray quad8_count_preset_enable_write), 1082f1d8a071SWilliam Breathitt Gray }; 1083f1d8a071SWilliam Breathitt Gray 1084f1d8a071SWilliam Breathitt Gray #define QUAD8_COUNT(_id, _cntname) { \ 1085f1d8a071SWilliam Breathitt Gray .id = (_id), \ 1086f1d8a071SWilliam Breathitt Gray .name = (_cntname), \ 1087f1d8a071SWilliam Breathitt Gray .functions_list = quad8_count_functions_list, \ 1088f1d8a071SWilliam Breathitt Gray .num_functions = ARRAY_SIZE(quad8_count_functions_list), \ 1089f1d8a071SWilliam Breathitt Gray .synapses = quad8_count_synapses[(_id)], \ 1090f1d8a071SWilliam Breathitt Gray .num_synapses = 2, \ 1091f1d8a071SWilliam Breathitt Gray .ext = quad8_count_ext, \ 1092f1d8a071SWilliam Breathitt Gray .num_ext = ARRAY_SIZE(quad8_count_ext) \ 1093f1d8a071SWilliam Breathitt Gray } 1094f1d8a071SWilliam Breathitt Gray 1095f1d8a071SWilliam Breathitt Gray static struct counter_count quad8_counts[] = { 1096f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(0, "Channel 1 Count"), 1097f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(1, "Channel 2 Count"), 1098f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(2, "Channel 3 Count"), 1099f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(3, "Channel 4 Count"), 1100f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(4, "Channel 5 Count"), 1101f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(5, "Channel 6 Count"), 1102f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(6, "Channel 7 Count"), 1103f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(7, "Channel 8 Count") 1104f1d8a071SWilliam Breathitt Gray }; 1105f1d8a071SWilliam Breathitt Gray 11067aa2ba0dSWilliam Breathitt Gray static irqreturn_t quad8_irq_handler(int irq, void *private) 11077aa2ba0dSWilliam Breathitt Gray { 11089e884bb1SUwe Kleine-König struct counter_device *counter = private; 11099e884bb1SUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 11107aa2ba0dSWilliam Breathitt Gray unsigned long irq_status; 11117aa2ba0dSWilliam Breathitt Gray unsigned long channel; 11127aa2ba0dSWilliam Breathitt Gray u8 event; 11137aa2ba0dSWilliam Breathitt Gray 1114daae1ee5SWilliam Breathitt Gray irq_status = ioread8(&priv->reg->interrupt_status); 11157aa2ba0dSWilliam Breathitt Gray if (!irq_status) 11167aa2ba0dSWilliam Breathitt Gray return IRQ_NONE; 11177aa2ba0dSWilliam Breathitt Gray 11187aa2ba0dSWilliam Breathitt Gray for_each_set_bit(channel, &irq_status, QUAD8_NUM_COUNTERS) { 11197aa2ba0dSWilliam Breathitt Gray switch (priv->irq_trigger[channel]) { 11207aa2ba0dSWilliam Breathitt Gray case QUAD8_EVENT_CARRY: 11217aa2ba0dSWilliam Breathitt Gray event = COUNTER_EVENT_OVERFLOW; 11227aa2ba0dSWilliam Breathitt Gray break; 11237aa2ba0dSWilliam Breathitt Gray case QUAD8_EVENT_COMPARE: 11247aa2ba0dSWilliam Breathitt Gray event = COUNTER_EVENT_THRESHOLD; 11257aa2ba0dSWilliam Breathitt Gray break; 11267aa2ba0dSWilliam Breathitt Gray case QUAD8_EVENT_CARRY_BORROW: 11277aa2ba0dSWilliam Breathitt Gray event = COUNTER_EVENT_OVERFLOW_UNDERFLOW; 11287aa2ba0dSWilliam Breathitt Gray break; 11297aa2ba0dSWilliam Breathitt Gray case QUAD8_EVENT_INDEX: 11307aa2ba0dSWilliam Breathitt Gray event = COUNTER_EVENT_INDEX; 11317aa2ba0dSWilliam Breathitt Gray break; 11327aa2ba0dSWilliam Breathitt Gray default: 11337aa2ba0dSWilliam Breathitt Gray /* should never reach this path */ 11347aa2ba0dSWilliam Breathitt Gray WARN_ONCE(true, "invalid interrupt trigger function %u configured for channel %lu\n", 11357aa2ba0dSWilliam Breathitt Gray priv->irq_trigger[channel], channel); 11367aa2ba0dSWilliam Breathitt Gray continue; 11377aa2ba0dSWilliam Breathitt Gray } 11387aa2ba0dSWilliam Breathitt Gray 11399e884bb1SUwe Kleine-König counter_push_event(counter, event, channel); 11407aa2ba0dSWilliam Breathitt Gray } 11417aa2ba0dSWilliam Breathitt Gray 11427aa2ba0dSWilliam Breathitt Gray /* Clear pending interrupts on device */ 1143daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, &priv->reg->channel_oper); 11447aa2ba0dSWilliam Breathitt Gray 11457aa2ba0dSWilliam Breathitt Gray return IRQ_HANDLED; 11467aa2ba0dSWilliam Breathitt Gray } 11477aa2ba0dSWilliam Breathitt Gray 1148daae1ee5SWilliam Breathitt Gray static void quad8_init_counter(struct channel_reg __iomem *const chan) 1149b6e9cdedSWilliam Breathitt Gray { 1150b6e9cdedSWilliam Breathitt Gray unsigned long i; 1151b6e9cdedSWilliam Breathitt Gray 1152b6e9cdedSWilliam Breathitt Gray /* Reset Byte Pointer */ 1153daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 1154b6e9cdedSWilliam Breathitt Gray /* Reset filter clock factor */ 1155daae1ee5SWilliam Breathitt Gray iowrite8(0, &chan->data); 1156b6e9cdedSWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, 1157daae1ee5SWilliam Breathitt Gray &chan->control); 1158b6e9cdedSWilliam Breathitt Gray /* Reset Byte Pointer */ 1159daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 1160b6e9cdedSWilliam Breathitt Gray /* Reset Preset Register */ 1161b6e9cdedSWilliam Breathitt Gray for (i = 0; i < 3; i++) 1162daae1ee5SWilliam Breathitt Gray iowrite8(0x00, &chan->data); 1163b6e9cdedSWilliam Breathitt Gray /* Reset Borrow, Carry, Compare, and Sign flags */ 1164daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, &chan->control); 1165b6e9cdedSWilliam Breathitt Gray /* Reset Error flag */ 1166daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, &chan->control); 1167b6e9cdedSWilliam Breathitt Gray /* Binary encoding; Normal count; non-quadrature mode */ 1168daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_CMR, &chan->control); 1169b6e9cdedSWilliam Breathitt Gray /* Disable A and B inputs; preset on index; FLG1 as Carry */ 1170daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IOR, &chan->control); 1171b6e9cdedSWilliam Breathitt Gray /* Disable index function; negative index polarity */ 1172daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IDR, &chan->control); 1173b6e9cdedSWilliam Breathitt Gray } 1174b6e9cdedSWilliam Breathitt Gray 1175f1d8a071SWilliam Breathitt Gray static int quad8_probe(struct device *dev, unsigned int id) 1176f1d8a071SWilliam Breathitt Gray { 11779e884bb1SUwe Kleine-König struct counter_device *counter; 1178e357e81fSWilliam Breathitt Gray struct quad8 *priv; 1179b6e9cdedSWilliam Breathitt Gray unsigned long i; 11807aa2ba0dSWilliam Breathitt Gray int err; 1181f1d8a071SWilliam Breathitt Gray 1182f1d8a071SWilliam Breathitt Gray if (!devm_request_region(dev, base[id], QUAD8_EXTENT, dev_name(dev))) { 1183f1d8a071SWilliam Breathitt Gray dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n", 1184f1d8a071SWilliam Breathitt Gray base[id], base[id] + QUAD8_EXTENT); 1185f1d8a071SWilliam Breathitt Gray return -EBUSY; 1186f1d8a071SWilliam Breathitt Gray } 1187f1d8a071SWilliam Breathitt Gray 11889e884bb1SUwe Kleine-König counter = devm_counter_alloc(dev, sizeof(*priv)); 11899e884bb1SUwe Kleine-König if (!counter) 1190f1d8a071SWilliam Breathitt Gray return -ENOMEM; 11919e884bb1SUwe Kleine-König priv = counter_priv(counter); 1192f1d8a071SWilliam Breathitt Gray 1193daae1ee5SWilliam Breathitt Gray priv->reg = devm_ioport_map(dev, base[id], QUAD8_EXTENT); 1194daae1ee5SWilliam Breathitt Gray if (!priv->reg) 1195b6e9cdedSWilliam Breathitt Gray return -ENOMEM; 1196b6e9cdedSWilliam Breathitt Gray 1197f1d8a071SWilliam Breathitt Gray /* Initialize Counter device and driver data */ 11989e884bb1SUwe Kleine-König counter->name = dev_name(dev); 11999e884bb1SUwe Kleine-König counter->parent = dev; 12009e884bb1SUwe Kleine-König counter->ops = &quad8_ops; 12019e884bb1SUwe Kleine-König counter->counts = quad8_counts; 12029e884bb1SUwe Kleine-König counter->num_counts = ARRAY_SIZE(quad8_counts); 12039e884bb1SUwe Kleine-König counter->signals = quad8_signals; 12049e884bb1SUwe Kleine-König counter->num_signals = ARRAY_SIZE(quad8_signals); 1205f1d8a071SWilliam Breathitt Gray 120609db4678SWilliam Breathitt Gray spin_lock_init(&priv->lock); 1207fc069262SSyed Nayyar Waris 12087aa2ba0dSWilliam Breathitt Gray /* Reset Index/Interrupt Register */ 1209daae1ee5SWilliam Breathitt Gray iowrite8(0x00, &priv->reg->index_interrupt); 1210f1d8a071SWilliam Breathitt Gray /* Reset all counters and disable interrupt function */ 1211daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CHAN_OP_RESET_COUNTERS, &priv->reg->channel_oper); 1212f1d8a071SWilliam Breathitt Gray /* Set initial configuration for all counters */ 1213b6e9cdedSWilliam Breathitt Gray for (i = 0; i < QUAD8_NUM_COUNTERS; i++) 1214daae1ee5SWilliam Breathitt Gray quad8_init_counter(priv->reg->channel + i); 1215954ab5ccSWilliam Breathitt Gray /* Disable Differential Encoder Cable Status for all channels */ 1216daae1ee5SWilliam Breathitt Gray iowrite8(0xFF, &priv->reg->cable_status); 12177aa2ba0dSWilliam Breathitt Gray /* Enable all counters and enable interrupt function */ 1218daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, &priv->reg->channel_oper); 12197aa2ba0dSWilliam Breathitt Gray 1220663d8fb0SWilliam Breathitt Gray err = devm_request_irq(&counter->dev, irq[id], quad8_irq_handler, 1221663d8fb0SWilliam Breathitt Gray IRQF_SHARED, counter->name, counter); 12227aa2ba0dSWilliam Breathitt Gray if (err) 12237aa2ba0dSWilliam Breathitt Gray return err; 1224f1d8a071SWilliam Breathitt Gray 12259e884bb1SUwe Kleine-König err = devm_counter_add(dev, counter); 12269e884bb1SUwe Kleine-König if (err < 0) 12279e884bb1SUwe Kleine-König return dev_err_probe(dev, err, "Failed to add counter\n"); 12289e884bb1SUwe Kleine-König 12299e884bb1SUwe Kleine-König return 0; 1230f1d8a071SWilliam Breathitt Gray } 1231f1d8a071SWilliam Breathitt Gray 1232f1d8a071SWilliam Breathitt Gray static struct isa_driver quad8_driver = { 1233f1d8a071SWilliam Breathitt Gray .probe = quad8_probe, 1234f1d8a071SWilliam Breathitt Gray .driver = { 1235f1d8a071SWilliam Breathitt Gray .name = "104-quad-8" 1236f1d8a071SWilliam Breathitt Gray } 1237f1d8a071SWilliam Breathitt Gray }; 1238f1d8a071SWilliam Breathitt Gray 1239f1d8a071SWilliam Breathitt Gray module_isa_driver(quad8_driver, num_quad8); 1240f1d8a071SWilliam Breathitt Gray 1241f1d8a071SWilliam Breathitt Gray MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>"); 1242e357e81fSWilliam Breathitt Gray MODULE_DESCRIPTION("ACCES 104-QUAD-8 driver"); 1243f1d8a071SWilliam Breathitt Gray MODULE_LICENSE("GPL v2"); 1244*3216e551SWilliam Breathitt Gray MODULE_IMPORT_NS(COUNTER); 1245