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)]; 31*0c83a280SWilliam Breathitt Gray static unsigned int num_irq; 32*0c83a280SWilliam Breathitt Gray module_param_hw_array(irq, uint, irq, &num_irq, 0); 337aa2ba0dSWilliam Breathitt Gray MODULE_PARM_DESC(irq, "ACCES 104-QUAD-8 interrupt line numbers"); 347aa2ba0dSWilliam Breathitt Gray 35f1d8a071SWilliam Breathitt Gray #define QUAD8_NUM_COUNTERS 8 36f1d8a071SWilliam Breathitt Gray 37f1d8a071SWilliam Breathitt Gray /** 38daae1ee5SWilliam Breathitt Gray * struct channel_reg - channel register structure 39daae1ee5SWilliam Breathitt Gray * @data: Count data 40daae1ee5SWilliam Breathitt Gray * @control: Channel flags and control 41daae1ee5SWilliam Breathitt Gray */ 42daae1ee5SWilliam Breathitt Gray struct channel_reg { 43daae1ee5SWilliam Breathitt Gray u8 data; 44daae1ee5SWilliam Breathitt Gray u8 control; 45daae1ee5SWilliam Breathitt Gray }; 46daae1ee5SWilliam Breathitt Gray 47daae1ee5SWilliam Breathitt Gray /** 48daae1ee5SWilliam Breathitt Gray * struct quad8_reg - device register structure 49daae1ee5SWilliam Breathitt Gray * @channel: quadrature counter data and control 50daae1ee5SWilliam Breathitt Gray * @interrupt_status: channel interrupt status 51daae1ee5SWilliam Breathitt Gray * @channel_oper: enable/reset counters and interrupt functions 52daae1ee5SWilliam Breathitt Gray * @index_interrupt: enable channel interrupts 53daae1ee5SWilliam Breathitt Gray * @reserved: reserved for Factory Use 54daae1ee5SWilliam Breathitt Gray * @index_input_levels: index signal logical input level 55daae1ee5SWilliam Breathitt Gray * @cable_status: differential encoder cable status 56daae1ee5SWilliam Breathitt Gray */ 57daae1ee5SWilliam Breathitt Gray struct quad8_reg { 58daae1ee5SWilliam Breathitt Gray struct channel_reg channel[QUAD8_NUM_COUNTERS]; 59daae1ee5SWilliam Breathitt Gray u8 interrupt_status; 60daae1ee5SWilliam Breathitt Gray u8 channel_oper; 61daae1ee5SWilliam Breathitt Gray u8 index_interrupt; 62daae1ee5SWilliam Breathitt Gray u8 reserved[3]; 63daae1ee5SWilliam Breathitt Gray u8 index_input_levels; 64daae1ee5SWilliam Breathitt Gray u8 cable_status; 65daae1ee5SWilliam Breathitt Gray }; 66daae1ee5SWilliam Breathitt Gray 67daae1ee5SWilliam Breathitt Gray /** 68e357e81fSWilliam Breathitt Gray * struct quad8 - device private data structure 6994a853ecSWilliam Breathitt Gray * @lock: lock to prevent clobbering device states during R/W ops 70f1d8a071SWilliam Breathitt Gray * @counter: instance of the counter_device 71954ab5ccSWilliam Breathitt Gray * @fck_prescaler: array of filter clock prescaler configurations 72f1d8a071SWilliam Breathitt Gray * @preset: array of preset values 73f1d8a071SWilliam Breathitt Gray * @count_mode: array of count mode configurations 74f1d8a071SWilliam Breathitt Gray * @quadrature_mode: array of quadrature mode configurations 75f1d8a071SWilliam Breathitt Gray * @quadrature_scale: array of quadrature mode scale configurations 76f1d8a071SWilliam Breathitt Gray * @ab_enable: array of A and B inputs enable configurations 77f1d8a071SWilliam Breathitt Gray * @preset_enable: array of set_to_preset_on_index attribute configurations 787aa2ba0dSWilliam Breathitt Gray * @irq_trigger: array of current IRQ trigger function configurations 79f1d8a071SWilliam Breathitt Gray * @synchronous_mode: array of index function synchronous mode configurations 80f1d8a071SWilliam Breathitt Gray * @index_polarity: array of index function polarity configurations 81954ab5ccSWilliam Breathitt Gray * @cable_fault_enable: differential encoder cable status enable configurations 82daae1ee5SWilliam Breathitt Gray * @reg: I/O address offset for the device registers 83f1d8a071SWilliam Breathitt Gray */ 84e357e81fSWilliam Breathitt Gray struct quad8 { 8509db4678SWilliam Breathitt Gray spinlock_t lock; 86de65d055SWilliam Breathitt Gray unsigned int fck_prescaler[QUAD8_NUM_COUNTERS]; 87f1d8a071SWilliam Breathitt Gray unsigned int preset[QUAD8_NUM_COUNTERS]; 88f1d8a071SWilliam Breathitt Gray unsigned int count_mode[QUAD8_NUM_COUNTERS]; 89f1d8a071SWilliam Breathitt Gray unsigned int quadrature_mode[QUAD8_NUM_COUNTERS]; 90f1d8a071SWilliam Breathitt Gray unsigned int quadrature_scale[QUAD8_NUM_COUNTERS]; 91f1d8a071SWilliam Breathitt Gray unsigned int ab_enable[QUAD8_NUM_COUNTERS]; 92f1d8a071SWilliam Breathitt Gray unsigned int preset_enable[QUAD8_NUM_COUNTERS]; 937aa2ba0dSWilliam Breathitt Gray unsigned int irq_trigger[QUAD8_NUM_COUNTERS]; 94f1d8a071SWilliam Breathitt Gray unsigned int synchronous_mode[QUAD8_NUM_COUNTERS]; 95f1d8a071SWilliam Breathitt Gray unsigned int index_polarity[QUAD8_NUM_COUNTERS]; 96954ab5ccSWilliam Breathitt Gray unsigned int cable_fault_enable; 97daae1ee5SWilliam Breathitt Gray struct quad8_reg __iomem *reg; 98f1d8a071SWilliam Breathitt Gray }; 99f1d8a071SWilliam Breathitt Gray 100f1d8a071SWilliam Breathitt Gray /* Borrow Toggle flip-flop */ 101f1d8a071SWilliam Breathitt Gray #define QUAD8_FLAG_BT BIT(0) 102f1d8a071SWilliam Breathitt Gray /* Carry Toggle flip-flop */ 103f1d8a071SWilliam Breathitt Gray #define QUAD8_FLAG_CT BIT(1) 104f1d8a071SWilliam Breathitt Gray /* Error flag */ 105f1d8a071SWilliam Breathitt Gray #define QUAD8_FLAG_E BIT(4) 106f1d8a071SWilliam Breathitt Gray /* Up/Down flag */ 107f1d8a071SWilliam Breathitt Gray #define QUAD8_FLAG_UD BIT(5) 108f1d8a071SWilliam Breathitt Gray /* Reset and Load Signal Decoders */ 109f1d8a071SWilliam Breathitt Gray #define QUAD8_CTR_RLD 0x00 110f1d8a071SWilliam Breathitt Gray /* Counter Mode Register */ 111f1d8a071SWilliam Breathitt Gray #define QUAD8_CTR_CMR 0x20 112f1d8a071SWilliam Breathitt Gray /* Input / Output Control Register */ 113f1d8a071SWilliam Breathitt Gray #define QUAD8_CTR_IOR 0x40 114f1d8a071SWilliam Breathitt Gray /* Index Control Register */ 115f1d8a071SWilliam Breathitt Gray #define QUAD8_CTR_IDR 0x60 116f1d8a071SWilliam Breathitt Gray /* Reset Byte Pointer (three byte data pointer) */ 117f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_RESET_BP 0x01 118f1d8a071SWilliam Breathitt Gray /* Reset Counter */ 119f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_RESET_CNTR 0x02 120f1d8a071SWilliam Breathitt Gray /* Reset Borrow Toggle, Carry Toggle, Compare Toggle, and Sign flags */ 121f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_RESET_FLAGS 0x04 122f1d8a071SWilliam Breathitt Gray /* Reset Error flag */ 123f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_RESET_E 0x06 124f1d8a071SWilliam Breathitt Gray /* Preset Register to Counter */ 125f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_PRESET_CNTR 0x08 126f1d8a071SWilliam Breathitt Gray /* Transfer Counter to Output Latch */ 127f1d8a071SWilliam Breathitt Gray #define QUAD8_RLD_CNTR_OUT 0x10 128de65d055SWilliam Breathitt Gray /* Transfer Preset Register LSB to FCK Prescaler */ 129de65d055SWilliam Breathitt Gray #define QUAD8_RLD_PRESET_PSC 0x18 130f1d8a071SWilliam Breathitt Gray #define QUAD8_CHAN_OP_RESET_COUNTERS 0x01 1317aa2ba0dSWilliam Breathitt Gray #define QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC 0x04 132f1d8a071SWilliam Breathitt Gray #define QUAD8_CMR_QUADRATURE_X1 0x08 133f1d8a071SWilliam Breathitt Gray #define QUAD8_CMR_QUADRATURE_X2 0x10 134f1d8a071SWilliam Breathitt Gray #define QUAD8_CMR_QUADRATURE_X4 0x18 135f1d8a071SWilliam Breathitt Gray 136f1d8a071SWilliam Breathitt Gray static int quad8_signal_read(struct counter_device *counter, 137493b938aSWilliam Breathitt Gray struct counter_signal *signal, 138493b938aSWilliam Breathitt Gray enum counter_signal_level *level) 139f1d8a071SWilliam Breathitt Gray { 140aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 141f1d8a071SWilliam Breathitt Gray unsigned int state; 142f1d8a071SWilliam Breathitt Gray 143f1d8a071SWilliam Breathitt Gray /* Only Index signal levels can be read */ 144f1d8a071SWilliam Breathitt Gray if (signal->id < 16) 145f1d8a071SWilliam Breathitt Gray return -EINVAL; 146f1d8a071SWilliam Breathitt Gray 147daae1ee5SWilliam Breathitt Gray state = ioread8(&priv->reg->index_input_levels) & BIT(signal->id - 16); 148f1d8a071SWilliam Breathitt Gray 149493b938aSWilliam Breathitt Gray *level = (state) ? COUNTER_SIGNAL_LEVEL_HIGH : COUNTER_SIGNAL_LEVEL_LOW; 150f1d8a071SWilliam Breathitt Gray 151f1d8a071SWilliam Breathitt Gray return 0; 152f1d8a071SWilliam Breathitt Gray } 153f1d8a071SWilliam Breathitt Gray 154f1d8a071SWilliam Breathitt Gray static int quad8_count_read(struct counter_device *counter, 155aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 *val) 156f1d8a071SWilliam Breathitt Gray { 157aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 158daae1ee5SWilliam Breathitt Gray struct channel_reg __iomem *const chan = priv->reg->channel + count->id; 159f1d8a071SWilliam Breathitt Gray unsigned int flags; 160f1d8a071SWilliam Breathitt Gray unsigned int borrow; 161f1d8a071SWilliam Breathitt Gray unsigned int carry; 16209db4678SWilliam Breathitt Gray unsigned long irqflags; 163f1d8a071SWilliam Breathitt Gray int i; 164f1d8a071SWilliam Breathitt Gray 165daae1ee5SWilliam Breathitt Gray flags = ioread8(&chan->control); 166f1d8a071SWilliam Breathitt Gray borrow = flags & QUAD8_FLAG_BT; 167f1d8a071SWilliam Breathitt Gray carry = !!(flags & QUAD8_FLAG_CT); 168f1d8a071SWilliam Breathitt Gray 169f1d8a071SWilliam Breathitt Gray /* Borrow XOR Carry effectively doubles count range */ 170d49e6ee2SWilliam Breathitt Gray *val = (unsigned long)(borrow ^ carry) << 24; 171f1d8a071SWilliam Breathitt Gray 17209db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 173fc069262SSyed Nayyar Waris 174f1d8a071SWilliam Breathitt Gray /* Reset Byte Pointer; transfer Counter to Output Latch */ 175b6e9cdedSWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_CNTR_OUT, 176daae1ee5SWilliam Breathitt Gray &chan->control); 177f1d8a071SWilliam Breathitt Gray 178f1d8a071SWilliam Breathitt Gray for (i = 0; i < 3; i++) 179daae1ee5SWilliam Breathitt Gray *val |= (unsigned long)ioread8(&chan->data) << (8 * i); 180f1d8a071SWilliam Breathitt Gray 18109db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 182fc069262SSyed Nayyar Waris 183f1d8a071SWilliam Breathitt Gray return 0; 184f1d8a071SWilliam Breathitt Gray } 185f1d8a071SWilliam Breathitt Gray 186f1d8a071SWilliam Breathitt Gray static int quad8_count_write(struct counter_device *counter, 187aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 val) 188f1d8a071SWilliam Breathitt Gray { 189aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 190daae1ee5SWilliam Breathitt Gray struct channel_reg __iomem *const chan = priv->reg->channel + count->id; 19109db4678SWilliam Breathitt Gray unsigned long irqflags; 192f1d8a071SWilliam Breathitt Gray int i; 193f1d8a071SWilliam Breathitt Gray 194f1d8a071SWilliam Breathitt Gray /* Only 24-bit values are supported */ 195d49e6ee2SWilliam Breathitt Gray if (val > 0xFFFFFF) 196e2ff3198SWilliam Breathitt Gray return -ERANGE; 197f1d8a071SWilliam Breathitt Gray 19809db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 199fc069262SSyed Nayyar Waris 200f1d8a071SWilliam Breathitt Gray /* Reset Byte Pointer */ 201daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 202f1d8a071SWilliam Breathitt Gray 203f1d8a071SWilliam Breathitt Gray /* Counter can only be set via Preset Register */ 204f1d8a071SWilliam Breathitt Gray for (i = 0; i < 3; i++) 205daae1ee5SWilliam Breathitt Gray iowrite8(val >> (8 * i), &chan->data); 206f1d8a071SWilliam Breathitt Gray 207f1d8a071SWilliam Breathitt Gray /* Transfer Preset Register to Counter */ 208daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_PRESET_CNTR, &chan->control); 209f1d8a071SWilliam Breathitt Gray 210f1d8a071SWilliam Breathitt Gray /* Reset Byte Pointer */ 211daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 212f1d8a071SWilliam Breathitt Gray 213f1d8a071SWilliam Breathitt Gray /* Set Preset Register back to original value */ 214d49e6ee2SWilliam Breathitt Gray val = priv->preset[count->id]; 215f1d8a071SWilliam Breathitt Gray for (i = 0; i < 3; i++) 216daae1ee5SWilliam Breathitt Gray iowrite8(val >> (8 * i), &chan->data); 217f1d8a071SWilliam Breathitt Gray 218f1d8a071SWilliam Breathitt Gray /* Reset Borrow, Carry, Compare, and Sign flags */ 219daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, &chan->control); 220f1d8a071SWilliam Breathitt Gray /* Reset Error flag */ 221daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, &chan->control); 222f1d8a071SWilliam Breathitt Gray 22309db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 224fc069262SSyed Nayyar Waris 225f1d8a071SWilliam Breathitt Gray return 0; 226f1d8a071SWilliam Breathitt Gray } 227f1d8a071SWilliam Breathitt Gray 228394a0150SWilliam Breathitt Gray static const enum counter_function quad8_count_functions_list[] = { 229aaec1a0fSWilliam Breathitt Gray COUNTER_FUNCTION_PULSE_DIRECTION, 230aaec1a0fSWilliam Breathitt Gray COUNTER_FUNCTION_QUADRATURE_X1_A, 231aaec1a0fSWilliam Breathitt Gray COUNTER_FUNCTION_QUADRATURE_X2_A, 232aaec1a0fSWilliam Breathitt Gray COUNTER_FUNCTION_QUADRATURE_X4, 233f1d8a071SWilliam Breathitt Gray }; 234f1d8a071SWilliam Breathitt Gray 235aaec1a0fSWilliam Breathitt Gray static int quad8_function_read(struct counter_device *counter, 236aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 237aaec1a0fSWilliam Breathitt Gray enum counter_function *function) 238f1d8a071SWilliam Breathitt Gray { 239aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 240f1d8a071SWilliam Breathitt Gray const int id = count->id; 24109db4678SWilliam Breathitt Gray unsigned long irqflags; 242f1d8a071SWilliam Breathitt Gray 24309db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 244fc069262SSyed Nayyar Waris 245fc069262SSyed Nayyar Waris if (priv->quadrature_mode[id]) 246fc069262SSyed Nayyar Waris switch (priv->quadrature_scale[id]) { 247f1d8a071SWilliam Breathitt Gray case 0: 248aaec1a0fSWilliam Breathitt Gray *function = COUNTER_FUNCTION_QUADRATURE_X1_A; 249f1d8a071SWilliam Breathitt Gray break; 250f1d8a071SWilliam Breathitt Gray case 1: 251aaec1a0fSWilliam Breathitt Gray *function = COUNTER_FUNCTION_QUADRATURE_X2_A; 252f1d8a071SWilliam Breathitt Gray break; 253f1d8a071SWilliam Breathitt Gray case 2: 254aaec1a0fSWilliam Breathitt Gray *function = COUNTER_FUNCTION_QUADRATURE_X4; 255f1d8a071SWilliam Breathitt Gray break; 256f1d8a071SWilliam Breathitt Gray } 257f1d8a071SWilliam Breathitt Gray else 258aaec1a0fSWilliam Breathitt Gray *function = COUNTER_FUNCTION_PULSE_DIRECTION; 259f1d8a071SWilliam Breathitt Gray 26009db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 261fc069262SSyed Nayyar Waris 262f1d8a071SWilliam Breathitt Gray return 0; 263f1d8a071SWilliam Breathitt Gray } 264f1d8a071SWilliam Breathitt Gray 265aaec1a0fSWilliam Breathitt Gray static int quad8_function_write(struct counter_device *counter, 266aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 267aaec1a0fSWilliam Breathitt Gray enum counter_function function) 268f1d8a071SWilliam Breathitt Gray { 269aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 270f1d8a071SWilliam Breathitt Gray const int id = count->id; 271f1d8a071SWilliam Breathitt Gray unsigned int *const quadrature_mode = priv->quadrature_mode + id; 272f1d8a071SWilliam Breathitt Gray unsigned int *const scale = priv->quadrature_scale + id; 273f1d8a071SWilliam Breathitt Gray unsigned int *const synchronous_mode = priv->synchronous_mode + id; 274daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[id].control; 27509db4678SWilliam Breathitt Gray unsigned long irqflags; 276fc069262SSyed Nayyar Waris unsigned int mode_cfg; 277fc069262SSyed Nayyar Waris unsigned int idr_cfg; 278fc069262SSyed Nayyar Waris 27909db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 280fc069262SSyed Nayyar Waris 281fc069262SSyed Nayyar Waris mode_cfg = priv->count_mode[id] << 1; 282fc069262SSyed Nayyar Waris idr_cfg = priv->index_polarity[id] << 1; 283f1d8a071SWilliam Breathitt Gray 284aaec1a0fSWilliam Breathitt Gray if (function == COUNTER_FUNCTION_PULSE_DIRECTION) { 285f1d8a071SWilliam Breathitt Gray *quadrature_mode = 0; 286f1d8a071SWilliam Breathitt Gray 287f1d8a071SWilliam Breathitt Gray /* Quadrature scaling only available in quadrature mode */ 288f1d8a071SWilliam Breathitt Gray *scale = 0; 289f1d8a071SWilliam Breathitt Gray 290f1d8a071SWilliam Breathitt Gray /* Synchronous function not supported in non-quadrature mode */ 291f1d8a071SWilliam Breathitt Gray if (*synchronous_mode) { 292f1d8a071SWilliam Breathitt Gray *synchronous_mode = 0; 293f1d8a071SWilliam Breathitt Gray /* Disable synchronous function mode */ 294daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IDR | idr_cfg, control); 295f1d8a071SWilliam Breathitt Gray } 296f1d8a071SWilliam Breathitt Gray } else { 297f1d8a071SWilliam Breathitt Gray *quadrature_mode = 1; 298f1d8a071SWilliam Breathitt Gray 299f1d8a071SWilliam Breathitt Gray switch (function) { 300aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X1_A: 301f1d8a071SWilliam Breathitt Gray *scale = 0; 302f1d8a071SWilliam Breathitt Gray mode_cfg |= QUAD8_CMR_QUADRATURE_X1; 303f1d8a071SWilliam Breathitt Gray break; 304aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X2_A: 305f1d8a071SWilliam Breathitt Gray *scale = 1; 306f1d8a071SWilliam Breathitt Gray mode_cfg |= QUAD8_CMR_QUADRATURE_X2; 307f1d8a071SWilliam Breathitt Gray break; 308aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X4: 309f1d8a071SWilliam Breathitt Gray *scale = 2; 310f1d8a071SWilliam Breathitt Gray mode_cfg |= QUAD8_CMR_QUADRATURE_X4; 311f1d8a071SWilliam Breathitt Gray break; 312b11eed15SWilliam Breathitt Gray default: 313b11eed15SWilliam Breathitt Gray /* should never reach this path */ 31409db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 315b11eed15SWilliam Breathitt Gray return -EINVAL; 316f1d8a071SWilliam Breathitt Gray } 317f1d8a071SWilliam Breathitt Gray } 318f1d8a071SWilliam Breathitt Gray 319f1d8a071SWilliam Breathitt Gray /* Load mode configuration to Counter Mode Register */ 320daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_CMR | mode_cfg, control); 321f1d8a071SWilliam Breathitt Gray 32209db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 323fc069262SSyed Nayyar Waris 324f1d8a071SWilliam Breathitt Gray return 0; 325f1d8a071SWilliam Breathitt Gray } 326f1d8a071SWilliam Breathitt Gray 327aaec1a0fSWilliam Breathitt Gray static int quad8_direction_read(struct counter_device *counter, 328aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 329aaec1a0fSWilliam Breathitt Gray enum counter_count_direction *direction) 330f1d8a071SWilliam Breathitt Gray { 331aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 332f1d8a071SWilliam Breathitt Gray unsigned int ud_flag; 333daae1ee5SWilliam Breathitt Gray u8 __iomem *const flag_addr = &priv->reg->channel[count->id].control; 334f1d8a071SWilliam Breathitt Gray 335f1d8a071SWilliam Breathitt Gray /* U/D flag: nonzero = up, zero = down */ 336b6e9cdedSWilliam Breathitt Gray ud_flag = ioread8(flag_addr) & QUAD8_FLAG_UD; 337f1d8a071SWilliam Breathitt Gray 338f1d8a071SWilliam Breathitt Gray *direction = (ud_flag) ? COUNTER_COUNT_DIRECTION_FORWARD : 339f1d8a071SWilliam Breathitt Gray COUNTER_COUNT_DIRECTION_BACKWARD; 340aaec1a0fSWilliam Breathitt Gray 341aaec1a0fSWilliam Breathitt Gray return 0; 342f1d8a071SWilliam Breathitt Gray } 343f1d8a071SWilliam Breathitt Gray 3446a9eb0e3SWilliam Breathitt Gray static const enum counter_synapse_action quad8_index_actions_list[] = { 345aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_NONE, 346aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_RISING_EDGE, 347f1d8a071SWilliam Breathitt Gray }; 348f1d8a071SWilliam Breathitt Gray 3496a9eb0e3SWilliam Breathitt Gray static const enum counter_synapse_action quad8_synapse_actions_list[] = { 350aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_NONE, 351aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_RISING_EDGE, 352aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_FALLING_EDGE, 353aaec1a0fSWilliam Breathitt Gray COUNTER_SYNAPSE_ACTION_BOTH_EDGES, 354f1d8a071SWilliam Breathitt Gray }; 355f1d8a071SWilliam Breathitt Gray 356aaec1a0fSWilliam Breathitt Gray static int quad8_action_read(struct counter_device *counter, 357aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 358aaec1a0fSWilliam Breathitt Gray struct counter_synapse *synapse, 359aaec1a0fSWilliam Breathitt Gray enum counter_synapse_action *action) 360f1d8a071SWilliam Breathitt Gray { 361aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 362f1d8a071SWilliam Breathitt Gray int err; 363aaec1a0fSWilliam Breathitt Gray enum counter_function function; 364f1d8a071SWilliam Breathitt Gray const size_t signal_a_id = count->synapses[0].signal->id; 365f1d8a071SWilliam Breathitt Gray enum counter_count_direction direction; 366f1d8a071SWilliam Breathitt Gray 367f1d8a071SWilliam Breathitt Gray /* Handle Index signals */ 368f1d8a071SWilliam Breathitt Gray if (synapse->signal->id >= 16) { 369f1d8a071SWilliam Breathitt Gray if (priv->preset_enable[count->id]) 370aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; 371f1d8a071SWilliam Breathitt Gray else 372aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_NONE; 373f1d8a071SWilliam Breathitt Gray 374f1d8a071SWilliam Breathitt Gray return 0; 375f1d8a071SWilliam Breathitt Gray } 376f1d8a071SWilliam Breathitt Gray 377aaec1a0fSWilliam Breathitt Gray err = quad8_function_read(counter, count, &function); 378f1d8a071SWilliam Breathitt Gray if (err) 379f1d8a071SWilliam Breathitt Gray return err; 380f1d8a071SWilliam Breathitt Gray 381f1d8a071SWilliam Breathitt Gray /* Default action mode */ 382aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_NONE; 383f1d8a071SWilliam Breathitt Gray 384f1d8a071SWilliam Breathitt Gray /* Determine action mode based on current count function mode */ 385f1d8a071SWilliam Breathitt Gray switch (function) { 386aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_PULSE_DIRECTION: 387f1d8a071SWilliam Breathitt Gray if (synapse->signal->id == signal_a_id) 388aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; 389b11eed15SWilliam Breathitt Gray return 0; 390aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X1_A: 391f1d8a071SWilliam Breathitt Gray if (synapse->signal->id == signal_a_id) { 392aaec1a0fSWilliam Breathitt Gray err = quad8_direction_read(counter, count, &direction); 393aaec1a0fSWilliam Breathitt Gray if (err) 394aaec1a0fSWilliam Breathitt Gray return err; 395f1d8a071SWilliam Breathitt Gray 396f1d8a071SWilliam Breathitt Gray if (direction == COUNTER_COUNT_DIRECTION_FORWARD) 397aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE; 398f1d8a071SWilliam Breathitt Gray else 399aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE; 400f1d8a071SWilliam Breathitt Gray } 401b11eed15SWilliam Breathitt Gray return 0; 402aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X2_A: 403f1d8a071SWilliam Breathitt Gray if (synapse->signal->id == signal_a_id) 404aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; 405b11eed15SWilliam Breathitt Gray return 0; 406aaec1a0fSWilliam Breathitt Gray case COUNTER_FUNCTION_QUADRATURE_X4: 407aaec1a0fSWilliam Breathitt Gray *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES; 408f1d8a071SWilliam Breathitt Gray return 0; 409b11eed15SWilliam Breathitt Gray default: 410b11eed15SWilliam Breathitt Gray /* should never reach this path */ 411b11eed15SWilliam Breathitt Gray return -EINVAL; 412b11eed15SWilliam Breathitt Gray } 413f1d8a071SWilliam Breathitt Gray } 414f1d8a071SWilliam Breathitt Gray 4157aa2ba0dSWilliam Breathitt Gray enum { 4167aa2ba0dSWilliam Breathitt Gray QUAD8_EVENT_CARRY = 0, 4177aa2ba0dSWilliam Breathitt Gray QUAD8_EVENT_COMPARE = 1, 4187aa2ba0dSWilliam Breathitt Gray QUAD8_EVENT_CARRY_BORROW = 2, 4197aa2ba0dSWilliam Breathitt Gray QUAD8_EVENT_INDEX = 3, 4207aa2ba0dSWilliam Breathitt Gray }; 4217aa2ba0dSWilliam Breathitt Gray 4227aa2ba0dSWilliam Breathitt Gray static int quad8_events_configure(struct counter_device *counter) 4237aa2ba0dSWilliam Breathitt Gray { 424aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 4257aa2ba0dSWilliam Breathitt Gray unsigned long irq_enabled = 0; 4267aa2ba0dSWilliam Breathitt Gray unsigned long irqflags; 427c95cc0d9SWilliam Breathitt Gray struct counter_event_node *event_node; 428c95cc0d9SWilliam Breathitt Gray unsigned int next_irq_trigger; 4297aa2ba0dSWilliam Breathitt Gray unsigned long ior_cfg; 4307aa2ba0dSWilliam Breathitt Gray 4317aa2ba0dSWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 4327aa2ba0dSWilliam Breathitt Gray 433c95cc0d9SWilliam Breathitt Gray list_for_each_entry(event_node, &counter->events_list, l) { 434c95cc0d9SWilliam Breathitt Gray switch (event_node->event) { 435c95cc0d9SWilliam Breathitt Gray case COUNTER_EVENT_OVERFLOW: 436c95cc0d9SWilliam Breathitt Gray next_irq_trigger = QUAD8_EVENT_CARRY; 437c95cc0d9SWilliam Breathitt Gray break; 438c95cc0d9SWilliam Breathitt Gray case COUNTER_EVENT_THRESHOLD: 439c95cc0d9SWilliam Breathitt Gray next_irq_trigger = QUAD8_EVENT_COMPARE; 440c95cc0d9SWilliam Breathitt Gray break; 441c95cc0d9SWilliam Breathitt Gray case COUNTER_EVENT_OVERFLOW_UNDERFLOW: 442c95cc0d9SWilliam Breathitt Gray next_irq_trigger = QUAD8_EVENT_CARRY_BORROW; 443c95cc0d9SWilliam Breathitt Gray break; 444c95cc0d9SWilliam Breathitt Gray case COUNTER_EVENT_INDEX: 445c95cc0d9SWilliam Breathitt Gray next_irq_trigger = QUAD8_EVENT_INDEX; 446c95cc0d9SWilliam Breathitt Gray break; 447c95cc0d9SWilliam Breathitt Gray default: 448c95cc0d9SWilliam Breathitt Gray /* should never reach this path */ 449c95cc0d9SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 450c95cc0d9SWilliam Breathitt Gray return -EINVAL; 4517aa2ba0dSWilliam Breathitt Gray } 4527aa2ba0dSWilliam Breathitt Gray 453c95cc0d9SWilliam Breathitt Gray /* Skip configuration if it is the same as previously set */ 454c95cc0d9SWilliam Breathitt Gray if (priv->irq_trigger[event_node->channel] == next_irq_trigger) 455c95cc0d9SWilliam Breathitt Gray continue; 456c95cc0d9SWilliam Breathitt Gray 457c95cc0d9SWilliam Breathitt Gray /* Save new IRQ function configuration */ 458c95cc0d9SWilliam Breathitt Gray priv->irq_trigger[event_node->channel] = next_irq_trigger; 459c95cc0d9SWilliam Breathitt Gray 460c95cc0d9SWilliam Breathitt Gray /* Load configuration to I/O Control Register */ 461c95cc0d9SWilliam Breathitt Gray ior_cfg = priv->ab_enable[event_node->channel] | 462c95cc0d9SWilliam Breathitt Gray priv->preset_enable[event_node->channel] << 1 | 463c95cc0d9SWilliam Breathitt Gray priv->irq_trigger[event_node->channel] << 3; 464daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IOR | ior_cfg, 465daae1ee5SWilliam Breathitt Gray &priv->reg->channel[event_node->channel].control); 4667aa2ba0dSWilliam Breathitt Gray 4677aa2ba0dSWilliam Breathitt Gray /* Enable IRQ line */ 468c95cc0d9SWilliam Breathitt Gray irq_enabled |= BIT(event_node->channel); 4697aa2ba0dSWilliam Breathitt Gray } 4707aa2ba0dSWilliam Breathitt Gray 471daae1ee5SWilliam Breathitt Gray iowrite8(irq_enabled, &priv->reg->index_interrupt); 4727aa2ba0dSWilliam Breathitt Gray 4737aa2ba0dSWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 4747aa2ba0dSWilliam Breathitt Gray 4757aa2ba0dSWilliam Breathitt Gray return 0; 4767aa2ba0dSWilliam Breathitt Gray } 4777aa2ba0dSWilliam Breathitt Gray 4787aa2ba0dSWilliam Breathitt Gray static int quad8_watch_validate(struct counter_device *counter, 4797aa2ba0dSWilliam Breathitt Gray const struct counter_watch *watch) 4807aa2ba0dSWilliam Breathitt Gray { 481c95cc0d9SWilliam Breathitt Gray struct counter_event_node *event_node; 4827aa2ba0dSWilliam Breathitt Gray 4837aa2ba0dSWilliam Breathitt Gray if (watch->channel > QUAD8_NUM_COUNTERS - 1) 4847aa2ba0dSWilliam Breathitt Gray return -EINVAL; 4857aa2ba0dSWilliam Breathitt Gray 4867aa2ba0dSWilliam Breathitt Gray switch (watch->event) { 4877aa2ba0dSWilliam Breathitt Gray case COUNTER_EVENT_OVERFLOW: 4887aa2ba0dSWilliam Breathitt Gray case COUNTER_EVENT_THRESHOLD: 4897aa2ba0dSWilliam Breathitt Gray case COUNTER_EVENT_OVERFLOW_UNDERFLOW: 4907aa2ba0dSWilliam Breathitt Gray case COUNTER_EVENT_INDEX: 491c95cc0d9SWilliam Breathitt Gray list_for_each_entry(event_node, &counter->next_events_list, l) 492c95cc0d9SWilliam Breathitt Gray if (watch->channel == event_node->channel && 493c95cc0d9SWilliam Breathitt Gray watch->event != event_node->event) 4947aa2ba0dSWilliam Breathitt Gray return -EINVAL; 4957aa2ba0dSWilliam Breathitt Gray return 0; 4967aa2ba0dSWilliam Breathitt Gray default: 4977aa2ba0dSWilliam Breathitt Gray return -EINVAL; 4987aa2ba0dSWilliam Breathitt Gray } 4997aa2ba0dSWilliam Breathitt Gray } 5007aa2ba0dSWilliam Breathitt Gray 50117aa207eSYueHaibing static const struct counter_ops quad8_ops = { 502f1d8a071SWilliam Breathitt Gray .signal_read = quad8_signal_read, 503f1d8a071SWilliam Breathitt Gray .count_read = quad8_count_read, 504f1d8a071SWilliam Breathitt Gray .count_write = quad8_count_write, 505aaec1a0fSWilliam Breathitt Gray .function_read = quad8_function_read, 506aaec1a0fSWilliam Breathitt Gray .function_write = quad8_function_write, 5077aa2ba0dSWilliam Breathitt Gray .action_read = quad8_action_read, 5087aa2ba0dSWilliam Breathitt Gray .events_configure = quad8_events_configure, 5097aa2ba0dSWilliam Breathitt Gray .watch_validate = quad8_watch_validate, 510f1d8a071SWilliam Breathitt Gray }; 511f1d8a071SWilliam Breathitt Gray 512e357e81fSWilliam Breathitt Gray static const char *const quad8_index_polarity_modes[] = { 513e357e81fSWilliam Breathitt Gray "negative", 514e357e81fSWilliam Breathitt Gray "positive" 515e357e81fSWilliam Breathitt Gray }; 516e357e81fSWilliam Breathitt Gray 517f1d8a071SWilliam Breathitt Gray static int quad8_index_polarity_get(struct counter_device *counter, 518aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 519aaec1a0fSWilliam Breathitt Gray u32 *index_polarity) 520f1d8a071SWilliam Breathitt Gray { 521aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 522f1d8a071SWilliam Breathitt Gray const size_t channel_id = signal->id - 16; 523f1d8a071SWilliam Breathitt Gray 524f1d8a071SWilliam Breathitt Gray *index_polarity = priv->index_polarity[channel_id]; 525f1d8a071SWilliam Breathitt Gray 526f1d8a071SWilliam Breathitt Gray return 0; 527f1d8a071SWilliam Breathitt Gray } 528f1d8a071SWilliam Breathitt Gray 529f1d8a071SWilliam Breathitt Gray static int quad8_index_polarity_set(struct counter_device *counter, 530aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 531aaec1a0fSWilliam Breathitt Gray u32 index_polarity) 532f1d8a071SWilliam Breathitt Gray { 533aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 534f1d8a071SWilliam Breathitt Gray const size_t channel_id = signal->id - 16; 535daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[channel_id].control; 53609db4678SWilliam Breathitt Gray unsigned long irqflags; 537fc069262SSyed Nayyar Waris unsigned int idr_cfg = index_polarity << 1; 538fc069262SSyed Nayyar Waris 53909db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 540fc069262SSyed Nayyar Waris 541fc069262SSyed Nayyar Waris idr_cfg |= priv->synchronous_mode[channel_id]; 542f1d8a071SWilliam Breathitt Gray 543f1d8a071SWilliam Breathitt Gray priv->index_polarity[channel_id] = index_polarity; 544f1d8a071SWilliam Breathitt Gray 545f1d8a071SWilliam Breathitt Gray /* Load Index Control configuration to Index Control Register */ 546daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IDR | idr_cfg, control); 547f1d8a071SWilliam Breathitt Gray 54809db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 549fc069262SSyed Nayyar Waris 550f1d8a071SWilliam Breathitt Gray return 0; 551f1d8a071SWilliam Breathitt Gray } 552f1d8a071SWilliam Breathitt Gray 553e357e81fSWilliam Breathitt Gray static const char *const quad8_synchronous_modes[] = { 554e357e81fSWilliam Breathitt Gray "non-synchronous", 555e357e81fSWilliam Breathitt Gray "synchronous" 556e357e81fSWilliam Breathitt Gray }; 557e357e81fSWilliam Breathitt Gray 558f1d8a071SWilliam Breathitt Gray static int quad8_synchronous_mode_get(struct counter_device *counter, 559aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 560aaec1a0fSWilliam Breathitt Gray u32 *synchronous_mode) 561f1d8a071SWilliam Breathitt Gray { 562aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 563f1d8a071SWilliam Breathitt Gray const size_t channel_id = signal->id - 16; 564f1d8a071SWilliam Breathitt Gray 565f1d8a071SWilliam Breathitt Gray *synchronous_mode = priv->synchronous_mode[channel_id]; 566f1d8a071SWilliam Breathitt Gray 567f1d8a071SWilliam Breathitt Gray return 0; 568f1d8a071SWilliam Breathitt Gray } 569f1d8a071SWilliam Breathitt Gray 570f1d8a071SWilliam Breathitt Gray static int quad8_synchronous_mode_set(struct counter_device *counter, 571aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 572aaec1a0fSWilliam Breathitt Gray u32 synchronous_mode) 573f1d8a071SWilliam Breathitt Gray { 574aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 575f1d8a071SWilliam Breathitt Gray const size_t channel_id = signal->id - 16; 576daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[channel_id].control; 57709db4678SWilliam Breathitt Gray unsigned long irqflags; 578fc069262SSyed Nayyar Waris unsigned int idr_cfg = synchronous_mode; 579fc069262SSyed Nayyar Waris 58009db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 581fc069262SSyed Nayyar Waris 582fc069262SSyed Nayyar Waris idr_cfg |= priv->index_polarity[channel_id] << 1; 583f1d8a071SWilliam Breathitt Gray 584f1d8a071SWilliam Breathitt Gray /* Index function must be non-synchronous in non-quadrature mode */ 585fc069262SSyed Nayyar Waris if (synchronous_mode && !priv->quadrature_mode[channel_id]) { 58609db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 587f1d8a071SWilliam Breathitt Gray return -EINVAL; 588fc069262SSyed Nayyar Waris } 589f1d8a071SWilliam Breathitt Gray 590f1d8a071SWilliam Breathitt Gray priv->synchronous_mode[channel_id] = synchronous_mode; 591f1d8a071SWilliam Breathitt Gray 592f1d8a071SWilliam Breathitt Gray /* Load Index Control configuration to Index Control Register */ 593daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IDR | idr_cfg, control); 594f1d8a071SWilliam Breathitt Gray 59509db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 596fc069262SSyed Nayyar Waris 597f1d8a071SWilliam Breathitt Gray return 0; 598f1d8a071SWilliam Breathitt Gray } 599f1d8a071SWilliam Breathitt Gray 600aaec1a0fSWilliam Breathitt Gray static int quad8_count_floor_read(struct counter_device *counter, 601aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 *floor) 602f1d8a071SWilliam Breathitt Gray { 603f1d8a071SWilliam Breathitt Gray /* Only a floor of 0 is supported */ 604aaec1a0fSWilliam Breathitt Gray *floor = 0; 605aaec1a0fSWilliam Breathitt Gray 606aaec1a0fSWilliam Breathitt Gray return 0; 607f1d8a071SWilliam Breathitt Gray } 608f1d8a071SWilliam Breathitt Gray 609aaec1a0fSWilliam Breathitt Gray static int quad8_count_mode_read(struct counter_device *counter, 610aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 611aaec1a0fSWilliam Breathitt Gray enum counter_count_mode *cnt_mode) 612f1d8a071SWilliam Breathitt Gray { 613aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 614f1d8a071SWilliam Breathitt Gray 615f1d8a071SWilliam Breathitt Gray /* Map 104-QUAD-8 count mode to Generic Counter count mode */ 616f1d8a071SWilliam Breathitt Gray switch (priv->count_mode[count->id]) { 617f1d8a071SWilliam Breathitt Gray case 0: 618f1d8a071SWilliam Breathitt Gray *cnt_mode = COUNTER_COUNT_MODE_NORMAL; 619f1d8a071SWilliam Breathitt Gray break; 620f1d8a071SWilliam Breathitt Gray case 1: 621f1d8a071SWilliam Breathitt Gray *cnt_mode = COUNTER_COUNT_MODE_RANGE_LIMIT; 622f1d8a071SWilliam Breathitt Gray break; 623f1d8a071SWilliam Breathitt Gray case 2: 624f1d8a071SWilliam Breathitt Gray *cnt_mode = COUNTER_COUNT_MODE_NON_RECYCLE; 625f1d8a071SWilliam Breathitt Gray break; 626f1d8a071SWilliam Breathitt Gray case 3: 627f1d8a071SWilliam Breathitt Gray *cnt_mode = COUNTER_COUNT_MODE_MODULO_N; 628f1d8a071SWilliam Breathitt Gray break; 629f1d8a071SWilliam Breathitt Gray } 630f1d8a071SWilliam Breathitt Gray 631f1d8a071SWilliam Breathitt Gray return 0; 632f1d8a071SWilliam Breathitt Gray } 633f1d8a071SWilliam Breathitt Gray 634aaec1a0fSWilliam Breathitt Gray static int quad8_count_mode_write(struct counter_device *counter, 635aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 636aaec1a0fSWilliam Breathitt Gray enum counter_count_mode cnt_mode) 637f1d8a071SWilliam Breathitt Gray { 638aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 639aaec1a0fSWilliam Breathitt Gray unsigned int count_mode; 640f1d8a071SWilliam Breathitt Gray unsigned int mode_cfg; 641daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[count->id].control; 64209db4678SWilliam Breathitt Gray unsigned long irqflags; 643f1d8a071SWilliam Breathitt Gray 644f1d8a071SWilliam Breathitt Gray /* Map Generic Counter count mode to 104-QUAD-8 count mode */ 645f1d8a071SWilliam Breathitt Gray switch (cnt_mode) { 646f1d8a071SWilliam Breathitt Gray case COUNTER_COUNT_MODE_NORMAL: 647aaec1a0fSWilliam Breathitt Gray count_mode = 0; 648f1d8a071SWilliam Breathitt Gray break; 649f1d8a071SWilliam Breathitt Gray case COUNTER_COUNT_MODE_RANGE_LIMIT: 650aaec1a0fSWilliam Breathitt Gray count_mode = 1; 651f1d8a071SWilliam Breathitt Gray break; 652f1d8a071SWilliam Breathitt Gray case COUNTER_COUNT_MODE_NON_RECYCLE: 653aaec1a0fSWilliam Breathitt Gray count_mode = 2; 654f1d8a071SWilliam Breathitt Gray break; 655f1d8a071SWilliam Breathitt Gray case COUNTER_COUNT_MODE_MODULO_N: 656aaec1a0fSWilliam Breathitt Gray count_mode = 3; 657f1d8a071SWilliam Breathitt Gray break; 658b11eed15SWilliam Breathitt Gray default: 659b11eed15SWilliam Breathitt Gray /* should never reach this path */ 660b11eed15SWilliam Breathitt Gray return -EINVAL; 661f1d8a071SWilliam Breathitt Gray } 662f1d8a071SWilliam Breathitt Gray 66309db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 664fc069262SSyed Nayyar Waris 665aaec1a0fSWilliam Breathitt Gray priv->count_mode[count->id] = count_mode; 666f1d8a071SWilliam Breathitt Gray 667f1d8a071SWilliam Breathitt Gray /* Set count mode configuration value */ 668aaec1a0fSWilliam Breathitt Gray mode_cfg = count_mode << 1; 669f1d8a071SWilliam Breathitt Gray 670f1d8a071SWilliam Breathitt Gray /* Add quadrature mode configuration */ 671f1d8a071SWilliam Breathitt Gray if (priv->quadrature_mode[count->id]) 672f1d8a071SWilliam Breathitt Gray mode_cfg |= (priv->quadrature_scale[count->id] + 1) << 3; 673f1d8a071SWilliam Breathitt Gray 674f1d8a071SWilliam Breathitt Gray /* Load mode configuration to Counter Mode Register */ 675daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_CMR | mode_cfg, control); 676f1d8a071SWilliam Breathitt Gray 67709db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 678fc069262SSyed Nayyar Waris 679f1d8a071SWilliam Breathitt Gray return 0; 680f1d8a071SWilliam Breathitt Gray } 681f1d8a071SWilliam Breathitt Gray 682aaec1a0fSWilliam Breathitt Gray static int quad8_count_enable_read(struct counter_device *counter, 683aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u8 *enable) 684f1d8a071SWilliam Breathitt Gray { 685aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 686f1d8a071SWilliam Breathitt Gray 687aaec1a0fSWilliam Breathitt Gray *enable = priv->ab_enable[count->id]; 688aaec1a0fSWilliam Breathitt Gray 689aaec1a0fSWilliam Breathitt Gray return 0; 690f1d8a071SWilliam Breathitt Gray } 691f1d8a071SWilliam Breathitt Gray 692aaec1a0fSWilliam Breathitt Gray static int quad8_count_enable_write(struct counter_device *counter, 693aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u8 enable) 694f1d8a071SWilliam Breathitt Gray { 695aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 696daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[count->id].control; 69709db4678SWilliam Breathitt Gray unsigned long irqflags; 698f1d8a071SWilliam Breathitt Gray unsigned int ior_cfg; 699f1d8a071SWilliam Breathitt Gray 70009db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 701fc069262SSyed Nayyar Waris 702aaec1a0fSWilliam Breathitt Gray priv->ab_enable[count->id] = enable; 703f1d8a071SWilliam Breathitt Gray 7047aa2ba0dSWilliam Breathitt Gray ior_cfg = enable | priv->preset_enable[count->id] << 1 | 7057aa2ba0dSWilliam Breathitt Gray priv->irq_trigger[count->id] << 3; 706f1d8a071SWilliam Breathitt Gray 707f1d8a071SWilliam Breathitt Gray /* Load I/O control configuration */ 708daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IOR | ior_cfg, control); 709f1d8a071SWilliam Breathitt Gray 71009db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 711fc069262SSyed Nayyar Waris 712aaec1a0fSWilliam Breathitt Gray return 0; 713f1d8a071SWilliam Breathitt Gray } 714f1d8a071SWilliam Breathitt Gray 715e357e81fSWilliam Breathitt Gray static const char *const quad8_noise_error_states[] = { 716e357e81fSWilliam Breathitt Gray "No excessive noise is present at the count inputs", 717e357e81fSWilliam Breathitt Gray "Excessive noise is present at the count inputs" 718e357e81fSWilliam Breathitt Gray }; 719e357e81fSWilliam Breathitt Gray 720f1d8a071SWilliam Breathitt Gray static int quad8_error_noise_get(struct counter_device *counter, 721aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u32 *noise_error) 722f1d8a071SWilliam Breathitt Gray { 723aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 724daae1ee5SWilliam Breathitt Gray u8 __iomem *const flag_addr = &priv->reg->channel[count->id].control; 725f1d8a071SWilliam Breathitt Gray 726daae1ee5SWilliam Breathitt Gray *noise_error = !!(ioread8(flag_addr) & QUAD8_FLAG_E); 727f1d8a071SWilliam Breathitt Gray 728f1d8a071SWilliam Breathitt Gray return 0; 729f1d8a071SWilliam Breathitt Gray } 730f1d8a071SWilliam Breathitt Gray 731aaec1a0fSWilliam Breathitt Gray static int quad8_count_preset_read(struct counter_device *counter, 732aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 *preset) 733f1d8a071SWilliam Breathitt Gray { 734aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 735f1d8a071SWilliam Breathitt Gray 736aaec1a0fSWilliam Breathitt Gray *preset = priv->preset[count->id]; 737aaec1a0fSWilliam Breathitt Gray 738aaec1a0fSWilliam Breathitt Gray return 0; 739f1d8a071SWilliam Breathitt Gray } 740f1d8a071SWilliam Breathitt Gray 741e612b600SWilliam Breathitt Gray static void quad8_preset_register_set(struct quad8 *const priv, const int id, 742e612b600SWilliam Breathitt Gray const unsigned int preset) 743fc069262SSyed Nayyar Waris { 744daae1ee5SWilliam Breathitt Gray struct channel_reg __iomem *const chan = priv->reg->channel + id; 745fc069262SSyed Nayyar Waris int i; 746fc069262SSyed Nayyar Waris 747e357e81fSWilliam Breathitt Gray priv->preset[id] = preset; 748fc069262SSyed Nayyar Waris 749fc069262SSyed Nayyar Waris /* Reset Byte Pointer */ 750daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 751fc069262SSyed Nayyar Waris 752fc069262SSyed Nayyar Waris /* Set Preset Register */ 753fc069262SSyed Nayyar Waris for (i = 0; i < 3; i++) 754daae1ee5SWilliam Breathitt Gray iowrite8(preset >> (8 * i), &chan->data); 755fc069262SSyed Nayyar Waris } 756fc069262SSyed Nayyar Waris 757aaec1a0fSWilliam Breathitt Gray static int quad8_count_preset_write(struct counter_device *counter, 758aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 preset) 759f1d8a071SWilliam Breathitt Gray { 760aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 76109db4678SWilliam Breathitt Gray unsigned long irqflags; 762f1d8a071SWilliam Breathitt Gray 763f1d8a071SWilliam Breathitt Gray /* Only 24-bit values are supported */ 764f1d8a071SWilliam Breathitt Gray if (preset > 0xFFFFFF) 765e2ff3198SWilliam Breathitt Gray return -ERANGE; 766f1d8a071SWilliam Breathitt Gray 76709db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 768f1d8a071SWilliam Breathitt Gray 769fc069262SSyed Nayyar Waris quad8_preset_register_set(priv, count->id, preset); 770f1d8a071SWilliam Breathitt Gray 77109db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 772f1d8a071SWilliam Breathitt Gray 773aaec1a0fSWilliam Breathitt Gray return 0; 774f1d8a071SWilliam Breathitt Gray } 775f1d8a071SWilliam Breathitt Gray 776aaec1a0fSWilliam Breathitt Gray static int quad8_count_ceiling_read(struct counter_device *counter, 777aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 *ceiling) 778f1d8a071SWilliam Breathitt Gray { 779aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 78009db4678SWilliam Breathitt Gray unsigned long irqflags; 781fc069262SSyed Nayyar Waris 78209db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 783f1d8a071SWilliam Breathitt Gray 784f1d8a071SWilliam Breathitt Gray /* Range Limit and Modulo-N count modes use preset value as ceiling */ 785f1d8a071SWilliam Breathitt Gray switch (priv->count_mode[count->id]) { 786f1d8a071SWilliam Breathitt Gray case 1: 787f1d8a071SWilliam Breathitt Gray case 3: 788aaec1a0fSWilliam Breathitt Gray *ceiling = priv->preset[count->id]; 789aaec1a0fSWilliam Breathitt Gray break; 790aaec1a0fSWilliam Breathitt Gray default: 791f1d8a071SWilliam Breathitt Gray /* By default 0x1FFFFFF (25 bits unsigned) is maximum count */ 792aaec1a0fSWilliam Breathitt Gray *ceiling = 0x1FFFFFF; 793aaec1a0fSWilliam Breathitt Gray break; 794f1d8a071SWilliam Breathitt Gray } 795f1d8a071SWilliam Breathitt Gray 79609db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 797aaec1a0fSWilliam Breathitt Gray 798aaec1a0fSWilliam Breathitt Gray return 0; 799aaec1a0fSWilliam Breathitt Gray } 800aaec1a0fSWilliam Breathitt Gray 801aaec1a0fSWilliam Breathitt Gray static int quad8_count_ceiling_write(struct counter_device *counter, 802aaec1a0fSWilliam Breathitt Gray struct counter_count *count, u64 ceiling) 803f1d8a071SWilliam Breathitt Gray { 804aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 80509db4678SWilliam Breathitt Gray unsigned long irqflags; 806fc069262SSyed Nayyar Waris 807fc069262SSyed Nayyar Waris /* Only 24-bit values are supported */ 808fc069262SSyed Nayyar Waris if (ceiling > 0xFFFFFF) 809e2ff3198SWilliam Breathitt Gray return -ERANGE; 810fc069262SSyed Nayyar Waris 81109db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 812f1d8a071SWilliam Breathitt Gray 813f1d8a071SWilliam Breathitt Gray /* Range Limit and Modulo-N count modes use preset value as ceiling */ 814f1d8a071SWilliam Breathitt Gray switch (priv->count_mode[count->id]) { 815f1d8a071SWilliam Breathitt Gray case 1: 816f1d8a071SWilliam Breathitt Gray case 3: 817fc069262SSyed Nayyar Waris quad8_preset_register_set(priv, count->id, ceiling); 81809db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 819aaec1a0fSWilliam Breathitt Gray return 0; 820f1d8a071SWilliam Breathitt Gray } 821f1d8a071SWilliam Breathitt Gray 82209db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 823fc069262SSyed Nayyar Waris 824728246e8SWilliam Breathitt Gray return -EINVAL; 825f1d8a071SWilliam Breathitt Gray } 826f1d8a071SWilliam Breathitt Gray 827aaec1a0fSWilliam Breathitt Gray static int quad8_count_preset_enable_read(struct counter_device *counter, 828aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 829aaec1a0fSWilliam Breathitt Gray u8 *preset_enable) 830f1d8a071SWilliam Breathitt Gray { 831aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 832f1d8a071SWilliam Breathitt Gray 833aaec1a0fSWilliam Breathitt Gray *preset_enable = !priv->preset_enable[count->id]; 834aaec1a0fSWilliam Breathitt Gray 835aaec1a0fSWilliam Breathitt Gray return 0; 836f1d8a071SWilliam Breathitt Gray } 837f1d8a071SWilliam Breathitt Gray 838aaec1a0fSWilliam Breathitt Gray static int quad8_count_preset_enable_write(struct counter_device *counter, 839aaec1a0fSWilliam Breathitt Gray struct counter_count *count, 840aaec1a0fSWilliam Breathitt Gray u8 preset_enable) 841f1d8a071SWilliam Breathitt Gray { 842aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 843daae1ee5SWilliam Breathitt Gray u8 __iomem *const control = &priv->reg->channel[count->id].control; 84409db4678SWilliam Breathitt Gray unsigned long irqflags; 845f1d8a071SWilliam Breathitt Gray unsigned int ior_cfg; 846f1d8a071SWilliam Breathitt Gray 847f1d8a071SWilliam Breathitt Gray /* Preset enable is active low in Input/Output Control register */ 848f1d8a071SWilliam Breathitt Gray preset_enable = !preset_enable; 849f1d8a071SWilliam Breathitt Gray 85009db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 851fc069262SSyed Nayyar Waris 852f1d8a071SWilliam Breathitt Gray priv->preset_enable[count->id] = preset_enable; 853f1d8a071SWilliam Breathitt Gray 8547aa2ba0dSWilliam Breathitt Gray ior_cfg = priv->ab_enable[count->id] | preset_enable << 1 | 8557aa2ba0dSWilliam Breathitt Gray priv->irq_trigger[count->id] << 3; 856f1d8a071SWilliam Breathitt Gray 857f1d8a071SWilliam Breathitt Gray /* Load I/O control configuration to Input / Output Control Register */ 858daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IOR | ior_cfg, control); 859f1d8a071SWilliam Breathitt Gray 86009db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 861fc069262SSyed Nayyar Waris 862aaec1a0fSWilliam Breathitt Gray return 0; 863f1d8a071SWilliam Breathitt Gray } 864f1d8a071SWilliam Breathitt Gray 865aaec1a0fSWilliam Breathitt Gray static int quad8_signal_cable_fault_read(struct counter_device *counter, 866954ab5ccSWilliam Breathitt Gray struct counter_signal *signal, 867aaec1a0fSWilliam Breathitt Gray u8 *cable_fault) 868954ab5ccSWilliam Breathitt Gray { 869aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 870954ab5ccSWilliam Breathitt Gray const size_t channel_id = signal->id / 2; 87109db4678SWilliam Breathitt Gray unsigned long irqflags; 872708d9893SSyed Nayyar Waris bool disabled; 873954ab5ccSWilliam Breathitt Gray unsigned int status; 874954ab5ccSWilliam Breathitt Gray 87509db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 876708d9893SSyed Nayyar Waris 877708d9893SSyed Nayyar Waris disabled = !(priv->cable_fault_enable & BIT(channel_id)); 878708d9893SSyed Nayyar Waris 879708d9893SSyed Nayyar Waris if (disabled) { 88009db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 881954ab5ccSWilliam Breathitt Gray return -EINVAL; 882708d9893SSyed Nayyar Waris } 883954ab5ccSWilliam Breathitt Gray 884954ab5ccSWilliam Breathitt Gray /* Logic 0 = cable fault */ 885daae1ee5SWilliam Breathitt Gray status = ioread8(&priv->reg->cable_status); 886954ab5ccSWilliam Breathitt Gray 88709db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 888708d9893SSyed Nayyar Waris 889954ab5ccSWilliam Breathitt Gray /* Mask respective channel and invert logic */ 890aaec1a0fSWilliam Breathitt Gray *cable_fault = !(status & BIT(channel_id)); 891954ab5ccSWilliam Breathitt Gray 892aaec1a0fSWilliam Breathitt Gray return 0; 893954ab5ccSWilliam Breathitt Gray } 894954ab5ccSWilliam Breathitt Gray 895aaec1a0fSWilliam Breathitt Gray static int quad8_signal_cable_fault_enable_read(struct counter_device *counter, 896aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 897aaec1a0fSWilliam Breathitt Gray u8 *enable) 898954ab5ccSWilliam Breathitt Gray { 899aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 900954ab5ccSWilliam Breathitt Gray const size_t channel_id = signal->id / 2; 901954ab5ccSWilliam Breathitt Gray 902aaec1a0fSWilliam Breathitt Gray *enable = !!(priv->cable_fault_enable & BIT(channel_id)); 903aaec1a0fSWilliam Breathitt Gray 904aaec1a0fSWilliam Breathitt Gray return 0; 905954ab5ccSWilliam Breathitt Gray } 906954ab5ccSWilliam Breathitt Gray 907aaec1a0fSWilliam Breathitt Gray static int quad8_signal_cable_fault_enable_write(struct counter_device *counter, 908aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 909aaec1a0fSWilliam Breathitt Gray u8 enable) 910954ab5ccSWilliam Breathitt Gray { 911aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 912954ab5ccSWilliam Breathitt Gray const size_t channel_id = signal->id / 2; 91309db4678SWilliam Breathitt Gray unsigned long irqflags; 914954ab5ccSWilliam Breathitt Gray unsigned int cable_fault_enable; 915954ab5ccSWilliam Breathitt Gray 91609db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 917708d9893SSyed Nayyar Waris 918954ab5ccSWilliam Breathitt Gray if (enable) 919954ab5ccSWilliam Breathitt Gray priv->cable_fault_enable |= BIT(channel_id); 920954ab5ccSWilliam Breathitt Gray else 921954ab5ccSWilliam Breathitt Gray priv->cable_fault_enable &= ~BIT(channel_id); 922954ab5ccSWilliam Breathitt Gray 923954ab5ccSWilliam Breathitt Gray /* Enable is active low in Differential Encoder Cable Status register */ 924954ab5ccSWilliam Breathitt Gray cable_fault_enable = ~priv->cable_fault_enable; 925954ab5ccSWilliam Breathitt Gray 926daae1ee5SWilliam Breathitt Gray iowrite8(cable_fault_enable, &priv->reg->cable_status); 927954ab5ccSWilliam Breathitt Gray 92809db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 929708d9893SSyed Nayyar Waris 930aaec1a0fSWilliam Breathitt Gray return 0; 931954ab5ccSWilliam Breathitt Gray } 932954ab5ccSWilliam Breathitt Gray 933aaec1a0fSWilliam Breathitt Gray static int quad8_signal_fck_prescaler_read(struct counter_device *counter, 934aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 935aaec1a0fSWilliam Breathitt Gray u8 *prescaler) 936de65d055SWilliam Breathitt Gray { 937aea8334bSUwe Kleine-König const struct quad8 *const priv = counter_priv(counter); 938de65d055SWilliam Breathitt Gray 939aaec1a0fSWilliam Breathitt Gray *prescaler = priv->fck_prescaler[signal->id / 2]; 940aaec1a0fSWilliam Breathitt Gray 941aaec1a0fSWilliam Breathitt Gray return 0; 942de65d055SWilliam Breathitt Gray } 943de65d055SWilliam Breathitt Gray 944aaec1a0fSWilliam Breathitt Gray static int quad8_signal_fck_prescaler_write(struct counter_device *counter, 945aaec1a0fSWilliam Breathitt Gray struct counter_signal *signal, 946aaec1a0fSWilliam Breathitt Gray u8 prescaler) 947de65d055SWilliam Breathitt Gray { 948aea8334bSUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 949de65d055SWilliam Breathitt Gray const size_t channel_id = signal->id / 2; 950daae1ee5SWilliam Breathitt Gray struct channel_reg __iomem *const chan = priv->reg->channel + channel_id; 95109db4678SWilliam Breathitt Gray unsigned long irqflags; 952de65d055SWilliam Breathitt Gray 95309db4678SWilliam Breathitt Gray spin_lock_irqsave(&priv->lock, irqflags); 954d5ed76adSSyed Nayyar Waris 955de65d055SWilliam Breathitt Gray priv->fck_prescaler[channel_id] = prescaler; 956de65d055SWilliam Breathitt Gray 957de65d055SWilliam Breathitt Gray /* Reset Byte Pointer */ 958daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 959de65d055SWilliam Breathitt Gray 960de65d055SWilliam Breathitt Gray /* Set filter clock factor */ 961daae1ee5SWilliam Breathitt Gray iowrite8(prescaler, &chan->data); 962b6e9cdedSWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, 963daae1ee5SWilliam Breathitt Gray &chan->control); 964de65d055SWilliam Breathitt Gray 96509db4678SWilliam Breathitt Gray spin_unlock_irqrestore(&priv->lock, irqflags); 966d5ed76adSSyed Nayyar Waris 967aaec1a0fSWilliam Breathitt Gray return 0; 968de65d055SWilliam Breathitt Gray } 969de65d055SWilliam Breathitt Gray 970aaec1a0fSWilliam Breathitt Gray static struct counter_comp quad8_signal_ext[] = { 971aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_BOOL("cable_fault", quad8_signal_cable_fault_read, 972aaec1a0fSWilliam Breathitt Gray NULL), 973aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_BOOL("cable_fault_enable", 974aaec1a0fSWilliam Breathitt Gray quad8_signal_cable_fault_enable_read, 975aaec1a0fSWilliam Breathitt Gray quad8_signal_cable_fault_enable_write), 976aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_U8("filter_clock_prescaler", 977aaec1a0fSWilliam Breathitt Gray quad8_signal_fck_prescaler_read, 978aaec1a0fSWilliam Breathitt Gray quad8_signal_fck_prescaler_write) 979de65d055SWilliam Breathitt Gray }; 980de65d055SWilliam Breathitt Gray 981aaec1a0fSWilliam Breathitt Gray static DEFINE_COUNTER_ENUM(quad8_index_pol_enum, quad8_index_polarity_modes); 982aaec1a0fSWilliam Breathitt Gray static DEFINE_COUNTER_ENUM(quad8_synch_mode_enum, quad8_synchronous_modes); 983aaec1a0fSWilliam Breathitt Gray 984aaec1a0fSWilliam Breathitt Gray static struct counter_comp quad8_index_ext[] = { 985aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_ENUM("index_polarity", quad8_index_polarity_get, 986aaec1a0fSWilliam Breathitt Gray quad8_index_polarity_set, 987aaec1a0fSWilliam Breathitt Gray quad8_index_pol_enum), 988aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_SIGNAL_ENUM("synchronous_mode", quad8_synchronous_mode_get, 989aaec1a0fSWilliam Breathitt Gray quad8_synchronous_mode_set, 990aaec1a0fSWilliam Breathitt Gray quad8_synch_mode_enum), 991f1d8a071SWilliam Breathitt Gray }; 992f1d8a071SWilliam Breathitt Gray 993f1d8a071SWilliam Breathitt Gray #define QUAD8_QUAD_SIGNAL(_id, _name) { \ 994f1d8a071SWilliam Breathitt Gray .id = (_id), \ 995de65d055SWilliam Breathitt Gray .name = (_name), \ 996de65d055SWilliam Breathitt Gray .ext = quad8_signal_ext, \ 997de65d055SWilliam Breathitt Gray .num_ext = ARRAY_SIZE(quad8_signal_ext) \ 998f1d8a071SWilliam Breathitt Gray } 999f1d8a071SWilliam Breathitt Gray 1000f1d8a071SWilliam Breathitt Gray #define QUAD8_INDEX_SIGNAL(_id, _name) { \ 1001f1d8a071SWilliam Breathitt Gray .id = (_id), \ 1002f1d8a071SWilliam Breathitt Gray .name = (_name), \ 1003f1d8a071SWilliam Breathitt Gray .ext = quad8_index_ext, \ 1004f1d8a071SWilliam Breathitt Gray .num_ext = ARRAY_SIZE(quad8_index_ext) \ 1005f1d8a071SWilliam Breathitt Gray } 1006f1d8a071SWilliam Breathitt Gray 1007f1d8a071SWilliam Breathitt Gray static struct counter_signal quad8_signals[] = { 1008f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(0, "Channel 1 Quadrature A"), 1009f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(1, "Channel 1 Quadrature B"), 1010f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(2, "Channel 2 Quadrature A"), 1011f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(3, "Channel 2 Quadrature B"), 1012f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(4, "Channel 3 Quadrature A"), 1013f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(5, "Channel 3 Quadrature B"), 1014f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(6, "Channel 4 Quadrature A"), 1015f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(7, "Channel 4 Quadrature B"), 1016f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(8, "Channel 5 Quadrature A"), 1017f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(9, "Channel 5 Quadrature B"), 1018f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(10, "Channel 6 Quadrature A"), 1019f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(11, "Channel 6 Quadrature B"), 1020f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(12, "Channel 7 Quadrature A"), 1021f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(13, "Channel 7 Quadrature B"), 1022f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(14, "Channel 8 Quadrature A"), 1023f1d8a071SWilliam Breathitt Gray QUAD8_QUAD_SIGNAL(15, "Channel 8 Quadrature B"), 1024f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(16, "Channel 1 Index"), 1025f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(17, "Channel 2 Index"), 1026f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(18, "Channel 3 Index"), 1027f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(19, "Channel 4 Index"), 1028f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(20, "Channel 5 Index"), 1029f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(21, "Channel 6 Index"), 1030f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(22, "Channel 7 Index"), 1031f1d8a071SWilliam Breathitt Gray QUAD8_INDEX_SIGNAL(23, "Channel 8 Index") 1032f1d8a071SWilliam Breathitt Gray }; 1033f1d8a071SWilliam Breathitt Gray 1034f1d8a071SWilliam Breathitt Gray #define QUAD8_COUNT_SYNAPSES(_id) { \ 1035f1d8a071SWilliam Breathitt Gray { \ 1036f1d8a071SWilliam Breathitt Gray .actions_list = quad8_synapse_actions_list, \ 1037f1d8a071SWilliam Breathitt Gray .num_actions = ARRAY_SIZE(quad8_synapse_actions_list), \ 1038f1d8a071SWilliam Breathitt Gray .signal = quad8_signals + 2 * (_id) \ 1039f1d8a071SWilliam Breathitt Gray }, \ 1040f1d8a071SWilliam Breathitt Gray { \ 1041f1d8a071SWilliam Breathitt Gray .actions_list = quad8_synapse_actions_list, \ 1042f1d8a071SWilliam Breathitt Gray .num_actions = ARRAY_SIZE(quad8_synapse_actions_list), \ 1043f1d8a071SWilliam Breathitt Gray .signal = quad8_signals + 2 * (_id) + 1 \ 1044f1d8a071SWilliam Breathitt Gray }, \ 1045f1d8a071SWilliam Breathitt Gray { \ 1046f1d8a071SWilliam Breathitt Gray .actions_list = quad8_index_actions_list, \ 1047f1d8a071SWilliam Breathitt Gray .num_actions = ARRAY_SIZE(quad8_index_actions_list), \ 1048f1d8a071SWilliam Breathitt Gray .signal = quad8_signals + 2 * (_id) + 16 \ 1049f1d8a071SWilliam Breathitt Gray } \ 1050f1d8a071SWilliam Breathitt Gray } 1051f1d8a071SWilliam Breathitt Gray 1052f1d8a071SWilliam Breathitt Gray static struct counter_synapse quad8_count_synapses[][3] = { 1053f1d8a071SWilliam Breathitt Gray QUAD8_COUNT_SYNAPSES(0), QUAD8_COUNT_SYNAPSES(1), 1054f1d8a071SWilliam Breathitt Gray QUAD8_COUNT_SYNAPSES(2), QUAD8_COUNT_SYNAPSES(3), 1055f1d8a071SWilliam Breathitt Gray QUAD8_COUNT_SYNAPSES(4), QUAD8_COUNT_SYNAPSES(5), 1056f1d8a071SWilliam Breathitt Gray QUAD8_COUNT_SYNAPSES(6), QUAD8_COUNT_SYNAPSES(7) 1057f1d8a071SWilliam Breathitt Gray }; 1058f1d8a071SWilliam Breathitt Gray 1059aaec1a0fSWilliam Breathitt Gray static const enum counter_count_mode quad8_cnt_modes[] = { 1060aaec1a0fSWilliam Breathitt Gray COUNTER_COUNT_MODE_NORMAL, 1061aaec1a0fSWilliam Breathitt Gray COUNTER_COUNT_MODE_RANGE_LIMIT, 1062aaec1a0fSWilliam Breathitt Gray COUNTER_COUNT_MODE_NON_RECYCLE, 1063aaec1a0fSWilliam Breathitt Gray COUNTER_COUNT_MODE_MODULO_N, 1064aaec1a0fSWilliam Breathitt Gray }; 1065aaec1a0fSWilliam Breathitt Gray 1066aaec1a0fSWilliam Breathitt Gray static DEFINE_COUNTER_AVAILABLE(quad8_count_mode_available, quad8_cnt_modes); 1067aaec1a0fSWilliam Breathitt Gray 1068aaec1a0fSWilliam Breathitt Gray static DEFINE_COUNTER_ENUM(quad8_error_noise_enum, quad8_noise_error_states); 1069aaec1a0fSWilliam Breathitt Gray 1070aaec1a0fSWilliam Breathitt Gray static struct counter_comp quad8_count_ext[] = { 1071aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_CEILING(quad8_count_ceiling_read, 1072aaec1a0fSWilliam Breathitt Gray quad8_count_ceiling_write), 1073aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_FLOOR(quad8_count_floor_read, NULL), 1074aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_COUNT_MODE(quad8_count_mode_read, quad8_count_mode_write, 1075aaec1a0fSWilliam Breathitt Gray quad8_count_mode_available), 1076aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_DIRECTION(quad8_direction_read), 1077aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_ENABLE(quad8_count_enable_read, quad8_count_enable_write), 1078aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_COUNT_ENUM("error_noise", quad8_error_noise_get, NULL, 1079aaec1a0fSWilliam Breathitt Gray quad8_error_noise_enum), 1080aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_PRESET(quad8_count_preset_read, quad8_count_preset_write), 1081aaec1a0fSWilliam Breathitt Gray COUNTER_COMP_PRESET_ENABLE(quad8_count_preset_enable_read, 1082aaec1a0fSWilliam Breathitt Gray quad8_count_preset_enable_write), 1083f1d8a071SWilliam Breathitt Gray }; 1084f1d8a071SWilliam Breathitt Gray 1085f1d8a071SWilliam Breathitt Gray #define QUAD8_COUNT(_id, _cntname) { \ 1086f1d8a071SWilliam Breathitt Gray .id = (_id), \ 1087f1d8a071SWilliam Breathitt Gray .name = (_cntname), \ 1088f1d8a071SWilliam Breathitt Gray .functions_list = quad8_count_functions_list, \ 1089f1d8a071SWilliam Breathitt Gray .num_functions = ARRAY_SIZE(quad8_count_functions_list), \ 1090f1d8a071SWilliam Breathitt Gray .synapses = quad8_count_synapses[(_id)], \ 1091f1d8a071SWilliam Breathitt Gray .num_synapses = 2, \ 1092f1d8a071SWilliam Breathitt Gray .ext = quad8_count_ext, \ 1093f1d8a071SWilliam Breathitt Gray .num_ext = ARRAY_SIZE(quad8_count_ext) \ 1094f1d8a071SWilliam Breathitt Gray } 1095f1d8a071SWilliam Breathitt Gray 1096f1d8a071SWilliam Breathitt Gray static struct counter_count quad8_counts[] = { 1097f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(0, "Channel 1 Count"), 1098f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(1, "Channel 2 Count"), 1099f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(2, "Channel 3 Count"), 1100f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(3, "Channel 4 Count"), 1101f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(4, "Channel 5 Count"), 1102f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(5, "Channel 6 Count"), 1103f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(6, "Channel 7 Count"), 1104f1d8a071SWilliam Breathitt Gray QUAD8_COUNT(7, "Channel 8 Count") 1105f1d8a071SWilliam Breathitt Gray }; 1106f1d8a071SWilliam Breathitt Gray 11077aa2ba0dSWilliam Breathitt Gray static irqreturn_t quad8_irq_handler(int irq, void *private) 11087aa2ba0dSWilliam Breathitt Gray { 11099e884bb1SUwe Kleine-König struct counter_device *counter = private; 11109e884bb1SUwe Kleine-König struct quad8 *const priv = counter_priv(counter); 11117aa2ba0dSWilliam Breathitt Gray unsigned long irq_status; 11127aa2ba0dSWilliam Breathitt Gray unsigned long channel; 11137aa2ba0dSWilliam Breathitt Gray u8 event; 11147aa2ba0dSWilliam Breathitt Gray 1115daae1ee5SWilliam Breathitt Gray irq_status = ioread8(&priv->reg->interrupt_status); 11167aa2ba0dSWilliam Breathitt Gray if (!irq_status) 11177aa2ba0dSWilliam Breathitt Gray return IRQ_NONE; 11187aa2ba0dSWilliam Breathitt Gray 11197aa2ba0dSWilliam Breathitt Gray for_each_set_bit(channel, &irq_status, QUAD8_NUM_COUNTERS) { 11207aa2ba0dSWilliam Breathitt Gray switch (priv->irq_trigger[channel]) { 11217aa2ba0dSWilliam Breathitt Gray case QUAD8_EVENT_CARRY: 11227aa2ba0dSWilliam Breathitt Gray event = COUNTER_EVENT_OVERFLOW; 11237aa2ba0dSWilliam Breathitt Gray break; 11247aa2ba0dSWilliam Breathitt Gray case QUAD8_EVENT_COMPARE: 11257aa2ba0dSWilliam Breathitt Gray event = COUNTER_EVENT_THRESHOLD; 11267aa2ba0dSWilliam Breathitt Gray break; 11277aa2ba0dSWilliam Breathitt Gray case QUAD8_EVENT_CARRY_BORROW: 11287aa2ba0dSWilliam Breathitt Gray event = COUNTER_EVENT_OVERFLOW_UNDERFLOW; 11297aa2ba0dSWilliam Breathitt Gray break; 11307aa2ba0dSWilliam Breathitt Gray case QUAD8_EVENT_INDEX: 11317aa2ba0dSWilliam Breathitt Gray event = COUNTER_EVENT_INDEX; 11327aa2ba0dSWilliam Breathitt Gray break; 11337aa2ba0dSWilliam Breathitt Gray default: 11347aa2ba0dSWilliam Breathitt Gray /* should never reach this path */ 11357aa2ba0dSWilliam Breathitt Gray WARN_ONCE(true, "invalid interrupt trigger function %u configured for channel %lu\n", 11367aa2ba0dSWilliam Breathitt Gray priv->irq_trigger[channel], channel); 11377aa2ba0dSWilliam Breathitt Gray continue; 11387aa2ba0dSWilliam Breathitt Gray } 11397aa2ba0dSWilliam Breathitt Gray 11409e884bb1SUwe Kleine-König counter_push_event(counter, event, channel); 11417aa2ba0dSWilliam Breathitt Gray } 11427aa2ba0dSWilliam Breathitt Gray 11437aa2ba0dSWilliam Breathitt Gray /* Clear pending interrupts on device */ 1144daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, &priv->reg->channel_oper); 11457aa2ba0dSWilliam Breathitt Gray 11467aa2ba0dSWilliam Breathitt Gray return IRQ_HANDLED; 11477aa2ba0dSWilliam Breathitt Gray } 11487aa2ba0dSWilliam Breathitt Gray 1149daae1ee5SWilliam Breathitt Gray static void quad8_init_counter(struct channel_reg __iomem *const chan) 1150b6e9cdedSWilliam Breathitt Gray { 1151b6e9cdedSWilliam Breathitt Gray unsigned long i; 1152b6e9cdedSWilliam Breathitt Gray 1153b6e9cdedSWilliam Breathitt Gray /* Reset Byte Pointer */ 1154daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 1155b6e9cdedSWilliam Breathitt Gray /* Reset filter clock factor */ 1156daae1ee5SWilliam Breathitt Gray iowrite8(0, &chan->data); 1157b6e9cdedSWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC, 1158daae1ee5SWilliam Breathitt Gray &chan->control); 1159b6e9cdedSWilliam Breathitt Gray /* Reset Byte Pointer */ 1160daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP, &chan->control); 1161b6e9cdedSWilliam Breathitt Gray /* Reset Preset Register */ 1162b6e9cdedSWilliam Breathitt Gray for (i = 0; i < 3; i++) 1163daae1ee5SWilliam Breathitt Gray iowrite8(0x00, &chan->data); 1164b6e9cdedSWilliam Breathitt Gray /* Reset Borrow, Carry, Compare, and Sign flags */ 1165daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_FLAGS, &chan->control); 1166b6e9cdedSWilliam Breathitt Gray /* Reset Error flag */ 1167daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_RLD | QUAD8_RLD_RESET_E, &chan->control); 1168b6e9cdedSWilliam Breathitt Gray /* Binary encoding; Normal count; non-quadrature mode */ 1169daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_CMR, &chan->control); 1170b6e9cdedSWilliam Breathitt Gray /* Disable A and B inputs; preset on index; FLG1 as Carry */ 1171daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IOR, &chan->control); 1172b6e9cdedSWilliam Breathitt Gray /* Disable index function; negative index polarity */ 1173daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CTR_IDR, &chan->control); 1174b6e9cdedSWilliam Breathitt Gray } 1175b6e9cdedSWilliam Breathitt Gray 1176f1d8a071SWilliam Breathitt Gray static int quad8_probe(struct device *dev, unsigned int id) 1177f1d8a071SWilliam Breathitt Gray { 11789e884bb1SUwe Kleine-König struct counter_device *counter; 1179e357e81fSWilliam Breathitt Gray struct quad8 *priv; 1180b6e9cdedSWilliam Breathitt Gray unsigned long i; 11817aa2ba0dSWilliam Breathitt Gray int err; 1182f1d8a071SWilliam Breathitt Gray 1183f1d8a071SWilliam Breathitt Gray if (!devm_request_region(dev, base[id], QUAD8_EXTENT, dev_name(dev))) { 1184f1d8a071SWilliam Breathitt Gray dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n", 1185f1d8a071SWilliam Breathitt Gray base[id], base[id] + QUAD8_EXTENT); 1186f1d8a071SWilliam Breathitt Gray return -EBUSY; 1187f1d8a071SWilliam Breathitt Gray } 1188f1d8a071SWilliam Breathitt Gray 11899e884bb1SUwe Kleine-König counter = devm_counter_alloc(dev, sizeof(*priv)); 11909e884bb1SUwe Kleine-König if (!counter) 1191f1d8a071SWilliam Breathitt Gray return -ENOMEM; 11929e884bb1SUwe Kleine-König priv = counter_priv(counter); 1193f1d8a071SWilliam Breathitt Gray 1194daae1ee5SWilliam Breathitt Gray priv->reg = devm_ioport_map(dev, base[id], QUAD8_EXTENT); 1195daae1ee5SWilliam Breathitt Gray if (!priv->reg) 1196b6e9cdedSWilliam Breathitt Gray return -ENOMEM; 1197b6e9cdedSWilliam Breathitt Gray 1198f1d8a071SWilliam Breathitt Gray /* Initialize Counter device and driver data */ 11999e884bb1SUwe Kleine-König counter->name = dev_name(dev); 12009e884bb1SUwe Kleine-König counter->parent = dev; 12019e884bb1SUwe Kleine-König counter->ops = &quad8_ops; 12029e884bb1SUwe Kleine-König counter->counts = quad8_counts; 12039e884bb1SUwe Kleine-König counter->num_counts = ARRAY_SIZE(quad8_counts); 12049e884bb1SUwe Kleine-König counter->signals = quad8_signals; 12059e884bb1SUwe Kleine-König counter->num_signals = ARRAY_SIZE(quad8_signals); 1206f1d8a071SWilliam Breathitt Gray 120709db4678SWilliam Breathitt Gray spin_lock_init(&priv->lock); 1208fc069262SSyed Nayyar Waris 12097aa2ba0dSWilliam Breathitt Gray /* Reset Index/Interrupt Register */ 1210daae1ee5SWilliam Breathitt Gray iowrite8(0x00, &priv->reg->index_interrupt); 1211f1d8a071SWilliam Breathitt Gray /* Reset all counters and disable interrupt function */ 1212daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CHAN_OP_RESET_COUNTERS, &priv->reg->channel_oper); 1213f1d8a071SWilliam Breathitt Gray /* Set initial configuration for all counters */ 1214b6e9cdedSWilliam Breathitt Gray for (i = 0; i < QUAD8_NUM_COUNTERS; i++) 1215daae1ee5SWilliam Breathitt Gray quad8_init_counter(priv->reg->channel + i); 1216954ab5ccSWilliam Breathitt Gray /* Disable Differential Encoder Cable Status for all channels */ 1217daae1ee5SWilliam Breathitt Gray iowrite8(0xFF, &priv->reg->cable_status); 12187aa2ba0dSWilliam Breathitt Gray /* Enable all counters and enable interrupt function */ 1219daae1ee5SWilliam Breathitt Gray iowrite8(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, &priv->reg->channel_oper); 12207aa2ba0dSWilliam Breathitt Gray 1221663d8fb0SWilliam Breathitt Gray err = devm_request_irq(&counter->dev, irq[id], quad8_irq_handler, 1222663d8fb0SWilliam Breathitt Gray IRQF_SHARED, counter->name, counter); 12237aa2ba0dSWilliam Breathitt Gray if (err) 12247aa2ba0dSWilliam Breathitt Gray return err; 1225f1d8a071SWilliam Breathitt Gray 12269e884bb1SUwe Kleine-König err = devm_counter_add(dev, counter); 12279e884bb1SUwe Kleine-König if (err < 0) 12289e884bb1SUwe Kleine-König return dev_err_probe(dev, err, "Failed to add counter\n"); 12299e884bb1SUwe Kleine-König 12309e884bb1SUwe Kleine-König return 0; 1231f1d8a071SWilliam Breathitt Gray } 1232f1d8a071SWilliam Breathitt Gray 1233f1d8a071SWilliam Breathitt Gray static struct isa_driver quad8_driver = { 1234f1d8a071SWilliam Breathitt Gray .probe = quad8_probe, 1235f1d8a071SWilliam Breathitt Gray .driver = { 1236f1d8a071SWilliam Breathitt Gray .name = "104-quad-8" 1237f1d8a071SWilliam Breathitt Gray } 1238f1d8a071SWilliam Breathitt Gray }; 1239f1d8a071SWilliam Breathitt Gray 1240*0c83a280SWilliam Breathitt Gray module_isa_driver_with_irq(quad8_driver, num_quad8, num_irq); 1241f1d8a071SWilliam Breathitt Gray 1242f1d8a071SWilliam Breathitt Gray MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>"); 1243e357e81fSWilliam Breathitt Gray MODULE_DESCRIPTION("ACCES 104-QUAD-8 driver"); 1244f1d8a071SWilliam Breathitt Gray MODULE_LICENSE("GPL v2"); 1245