Thomas Gleixner | 74ba920 | 2019-05-20 09:19:02 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 2 | /* |
Jeff Johnson | 6392194 | 2024-05-23 18:30:35 -0700 | [diff] [blame] | 3 | * UIO driver for Humusoft MF624 DAQ card. |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 4 | * Copyright (C) 2011 Rostislav Lisovy <lisovy@gmail.com>, |
| 5 | * Czech Technical University in Prague |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/device.h> |
| 11 | #include <linux/pci.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/io.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/uio_driver.h> |
| 16 | |
| 17 | #define PCI_VENDOR_ID_HUMUSOFT 0x186c |
| 18 | #define PCI_DEVICE_ID_MF624 0x0624 |
| 19 | #define PCI_SUBVENDOR_ID_HUMUSOFT 0x186c |
| 20 | #define PCI_SUBDEVICE_DEVICE 0x0624 |
| 21 | |
| 22 | /* BAR0 Interrupt control/status register */ |
| 23 | #define INTCSR 0x4C |
| 24 | #define INTCSR_ADINT_ENABLE (1 << 0) |
| 25 | #define INTCSR_CTR4INT_ENABLE (1 << 3) |
| 26 | #define INTCSR_PCIINT_ENABLE (1 << 6) |
| 27 | #define INTCSR_ADINT_STATUS (1 << 2) |
| 28 | #define INTCSR_CTR4INT_STATUS (1 << 5) |
| 29 | |
| 30 | enum mf624_interrupt_source {ADC, CTR4, ALL}; |
| 31 | |
Fengguang Wu | 497b46d | 2013-09-02 10:38:33 +0200 | [diff] [blame] | 32 | static void mf624_disable_interrupt(enum mf624_interrupt_source source, |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 33 | struct uio_info *info) |
| 34 | { |
| 35 | void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR; |
| 36 | |
| 37 | switch (source) { |
| 38 | case ADC: |
| 39 | iowrite32(ioread32(INTCSR_reg) |
| 40 | & ~(INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE), |
| 41 | INTCSR_reg); |
| 42 | break; |
| 43 | |
| 44 | case CTR4: |
| 45 | iowrite32(ioread32(INTCSR_reg) |
| 46 | & ~(INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE), |
| 47 | INTCSR_reg); |
| 48 | break; |
| 49 | |
| 50 | case ALL: |
| 51 | default: |
| 52 | iowrite32(ioread32(INTCSR_reg) |
| 53 | & ~(INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE |
| 54 | | INTCSR_PCIINT_ENABLE), |
| 55 | INTCSR_reg); |
| 56 | break; |
| 57 | } |
| 58 | } |
| 59 | |
Fengguang Wu | 497b46d | 2013-09-02 10:38:33 +0200 | [diff] [blame] | 60 | static void mf624_enable_interrupt(enum mf624_interrupt_source source, |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 61 | struct uio_info *info) |
| 62 | { |
| 63 | void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR; |
| 64 | |
| 65 | switch (source) { |
| 66 | case ADC: |
| 67 | iowrite32(ioread32(INTCSR_reg) |
| 68 | | INTCSR_ADINT_ENABLE | INTCSR_PCIINT_ENABLE, |
| 69 | INTCSR_reg); |
| 70 | break; |
| 71 | |
| 72 | case CTR4: |
| 73 | iowrite32(ioread32(INTCSR_reg) |
| 74 | | INTCSR_CTR4INT_ENABLE | INTCSR_PCIINT_ENABLE, |
| 75 | INTCSR_reg); |
| 76 | break; |
| 77 | |
| 78 | case ALL: |
| 79 | default: |
| 80 | iowrite32(ioread32(INTCSR_reg) |
| 81 | | INTCSR_ADINT_ENABLE | INTCSR_CTR4INT_ENABLE |
| 82 | | INTCSR_PCIINT_ENABLE, |
| 83 | INTCSR_reg); |
| 84 | break; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | static irqreturn_t mf624_irq_handler(int irq, struct uio_info *info) |
| 89 | { |
| 90 | void __iomem *INTCSR_reg = info->mem[0].internal_addr + INTCSR; |
| 91 | |
| 92 | if ((ioread32(INTCSR_reg) & INTCSR_ADINT_ENABLE) |
| 93 | && (ioread32(INTCSR_reg) & INTCSR_ADINT_STATUS)) { |
| 94 | mf624_disable_interrupt(ADC, info); |
| 95 | return IRQ_HANDLED; |
| 96 | } |
| 97 | |
| 98 | if ((ioread32(INTCSR_reg) & INTCSR_CTR4INT_ENABLE) |
| 99 | && (ioread32(INTCSR_reg) & INTCSR_CTR4INT_STATUS)) { |
| 100 | mf624_disable_interrupt(CTR4, info); |
| 101 | return IRQ_HANDLED; |
| 102 | } |
| 103 | |
| 104 | return IRQ_NONE; |
| 105 | } |
| 106 | |
| 107 | static int mf624_irqcontrol(struct uio_info *info, s32 irq_on) |
| 108 | { |
| 109 | if (irq_on == 0) |
| 110 | mf624_disable_interrupt(ALL, info); |
| 111 | else if (irq_on == 1) |
| 112 | mf624_enable_interrupt(ALL, info); |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
Michal Sojka | a15d2dd | 2017-03-16 14:50:09 +0100 | [diff] [blame] | 117 | static int mf624_setup_mem(struct pci_dev *dev, int bar, struct uio_mem *mem, const char *name) |
| 118 | { |
Michal Sojka | 270579d | 2017-03-16 14:50:10 +0100 | [diff] [blame] | 119 | resource_size_t start = pci_resource_start(dev, bar); |
| 120 | resource_size_t len = pci_resource_len(dev, bar); |
| 121 | |
Michal Sojka | a15d2dd | 2017-03-16 14:50:09 +0100 | [diff] [blame] | 122 | mem->name = name; |
Michal Sojka | 270579d | 2017-03-16 14:50:10 +0100 | [diff] [blame] | 123 | mem->addr = start & PAGE_MASK; |
| 124 | mem->offs = start & ~PAGE_MASK; |
Michal Sojka | a15d2dd | 2017-03-16 14:50:09 +0100 | [diff] [blame] | 125 | if (!mem->addr) |
| 126 | return -ENODEV; |
Michal Sojka | 270579d | 2017-03-16 14:50:10 +0100 | [diff] [blame] | 127 | mem->size = ((start & ~PAGE_MASK) + len + PAGE_SIZE - 1) & PAGE_MASK; |
Michal Sojka | a15d2dd | 2017-03-16 14:50:09 +0100 | [diff] [blame] | 128 | mem->memtype = UIO_MEM_PHYS; |
| 129 | mem->internal_addr = pci_ioremap_bar(dev, bar); |
| 130 | if (!mem->internal_addr) |
| 131 | return -ENODEV; |
| 132 | return 0; |
| 133 | } |
| 134 | |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 135 | static int mf624_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) |
| 136 | { |
| 137 | struct uio_info *info; |
| 138 | |
Alexandru Ardelean | 6b76c98 | 2020-11-20 10:42:06 +0200 | [diff] [blame] | 139 | info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL); |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 140 | if (!info) |
| 141 | return -ENOMEM; |
| 142 | |
| 143 | if (pci_enable_device(dev)) |
Alexandru Ardelean | 6b76c98 | 2020-11-20 10:42:06 +0200 | [diff] [blame] | 144 | return -ENODEV; |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 145 | |
| 146 | if (pci_request_regions(dev, "mf624")) |
| 147 | goto out_disable; |
| 148 | |
| 149 | info->name = "mf624"; |
| 150 | info->version = "0.0.1"; |
| 151 | |
| 152 | /* Note: Datasheet says device uses BAR0, BAR1, BAR2 -- do not trust it */ |
| 153 | |
| 154 | /* BAR0 */ |
Michal Sojka | a15d2dd | 2017-03-16 14:50:09 +0100 | [diff] [blame] | 155 | if (mf624_setup_mem(dev, 0, &info->mem[0], "PCI chipset, interrupts, status " |
| 156 | "bits, special functions")) |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 157 | goto out_release; |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 158 | /* BAR2 */ |
Michal Sojka | a15d2dd | 2017-03-16 14:50:09 +0100 | [diff] [blame] | 159 | if (mf624_setup_mem(dev, 2, &info->mem[1], "ADC, DAC, DIO")) |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 160 | goto out_unmap0; |
| 161 | |
| 162 | /* BAR4 */ |
Michal Sojka | a15d2dd | 2017-03-16 14:50:09 +0100 | [diff] [blame] | 163 | if (mf624_setup_mem(dev, 4, &info->mem[2], "Counter/timer chip")) |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 164 | goto out_unmap1; |
| 165 | |
| 166 | info->irq = dev->irq; |
| 167 | info->irq_flags = IRQF_SHARED; |
| 168 | info->handler = mf624_irq_handler; |
| 169 | |
| 170 | info->irqcontrol = mf624_irqcontrol; |
| 171 | |
| 172 | if (uio_register_device(&dev->dev, info)) |
| 173 | goto out_unmap2; |
| 174 | |
| 175 | pci_set_drvdata(dev, info); |
| 176 | |
| 177 | return 0; |
| 178 | |
| 179 | out_unmap2: |
| 180 | iounmap(info->mem[2].internal_addr); |
| 181 | out_unmap1: |
| 182 | iounmap(info->mem[1].internal_addr); |
| 183 | out_unmap0: |
| 184 | iounmap(info->mem[0].internal_addr); |
| 185 | |
| 186 | out_release: |
| 187 | pci_release_regions(dev); |
| 188 | |
| 189 | out_disable: |
| 190 | pci_disable_device(dev); |
| 191 | |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 192 | return -ENODEV; |
| 193 | } |
| 194 | |
| 195 | static void mf624_pci_remove(struct pci_dev *dev) |
| 196 | { |
| 197 | struct uio_info *info = pci_get_drvdata(dev); |
| 198 | |
| 199 | mf624_disable_interrupt(ALL, info); |
| 200 | |
| 201 | uio_unregister_device(info); |
| 202 | pci_release_regions(dev); |
| 203 | pci_disable_device(dev); |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 204 | |
| 205 | iounmap(info->mem[0].internal_addr); |
| 206 | iounmap(info->mem[1].internal_addr); |
| 207 | iounmap(info->mem[2].internal_addr); |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 208 | } |
| 209 | |
Jingoo Han | 0f4054d | 2013-12-03 08:27:13 +0900 | [diff] [blame] | 210 | static const struct pci_device_id mf624_pci_id[] = { |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 211 | { PCI_DEVICE(PCI_VENDOR_ID_HUMUSOFT, PCI_DEVICE_ID_MF624) }, |
| 212 | { 0, } |
| 213 | }; |
| 214 | |
| 215 | static struct pci_driver mf624_pci_driver = { |
| 216 | .name = "mf624", |
| 217 | .id_table = mf624_pci_id, |
| 218 | .probe = mf624_pci_probe, |
| 219 | .remove = mf624_pci_remove, |
| 220 | }; |
| 221 | MODULE_DEVICE_TABLE(pci, mf624_pci_id); |
| 222 | |
| 223 | module_pci_driver(mf624_pci_driver); |
Jeff Johnson | 6392194 | 2024-05-23 18:30:35 -0700 | [diff] [blame] | 224 | MODULE_DESCRIPTION("UIO driver for Humusoft MF624 DAQ card"); |
Rostislav Lisovy | 06849fa | 2013-08-30 14:58:02 +0200 | [diff] [blame] | 225 | MODULE_LICENSE("GPL v2"); |
| 226 | MODULE_AUTHOR("Rostislav Lisovy <lisovy@gmail.com>"); |