drivers/mfd/intel_quark_i2c_gpio.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel Quark MFD PCI driver for I2C & GPIO
   4  *
   5  * Copyright(c) 2014 Intel Corporation.
   6  *
   7  * Intel Quark PCI device for I2C and GPIO controller sharing the same
   8  * PCI function. This PCI driver will split the 2 devices into their
   9  * respective drivers.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/pci.h>
  15 #include <linux/mfd/core.h>
  16 #include <linux/clkdev.h>
  17 #include <linux/clk-provider.h>
  18 #include <linux/dmi.h>
  19 #include <linux/platform_data/gpio-dwapb.h>
  20 #include <linux/platform_data/i2c-designware.h>
  21
  22 /* PCI BAR for register base address */
  23 #define MFD_I2C_BAR             0
  24 #define MFD_GPIO_BAR            1
  25
  26 /* ACPI _ADR value to match the child node */
  27 #define MFD_ACPI_MATCH_GPIO     0ULL
  28 #define MFD_ACPI_MATCH_I2C      1ULL
  29
  30 /* The base GPIO number under GPIOLIB framework */
  31 #define INTEL_QUARK_MFD_GPIO_BASE       8
  32
  33 /* The default number of South-Cluster GPIO on Quark. */
  34 #define INTEL_QUARK_MFD_NGPIO           8
  35
  36 /* The DesignWare GPIO ports on Quark. */
  37 #define INTEL_QUARK_GPIO_NPORTS 1
  38
  39 #define INTEL_QUARK_IORES_MEM   0
  40 #define INTEL_QUARK_IORES_IRQ   1
  41
  42 #define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0"
  43
  44 /* The Quark I2C controller source clock */
  45 #define INTEL_QUARK_I2C_CLK_HZ  33000000
  46
  47 struct intel_quark_mfd {
  48         struct device           *dev;
  49         struct clk              *i2c_clk;
  50         struct clk_lookup       *i2c_clk_lookup;
  51 };
  52
  53 static const struct dmi_system_id dmi_platform_info[] = {
  54         {
  55                 .matches = {
  56                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"),
  57                 },
  58                 .driver_data = (void *)100000,
  59         },
  60         {
  61                 .matches = {
  62                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"),
  63                 },
  64                 .driver_data = (void *)400000,
  65         },
  66         {
  67                 .matches = {
  68                         DMI_EXACT_MATCH(DMI_BOARD_NAME, "SIMATIC IOT2000"),
  69                 },
  70                 .driver_data = (void *)400000,
  71         },
  72         {}
  73 };
  74
  75 static struct resource intel_quark_i2c_res[] = {
  76         [INTEL_QUARK_IORES_MEM] = {
  77                 .flags = IORESOURCE_MEM,
  78         },
  79         [INTEL_QUARK_IORES_IRQ] = {
  80                 .flags = IORESOURCE_IRQ,
  81         },
  82 };
  83
  84 static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = {
  85         .adr = MFD_ACPI_MATCH_I2C,
  86 };
  87
  88 static struct resource intel_quark_gpio_res[] = {
  89         [INTEL_QUARK_IORES_MEM] = {
  90                 .flags = IORESOURCE_MEM,
  91         },
  92 };
  93
  94 static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = {
  95         .adr = MFD_ACPI_MATCH_GPIO,
  96 };
  97
  98 static struct mfd_cell intel_quark_mfd_cells[] = {
  99         {
 100                 .id = MFD_GPIO_BAR,
 101                 .name = "gpio-dwapb",
 102                 .acpi_match = &intel_quark_acpi_match_gpio,
 103                 .num_resources = ARRAY_SIZE(intel_quark_gpio_res),
 104                 .resources = intel_quark_gpio_res,
 105                 .ignore_resource_conflicts = true,
 106         },
 107         {
 108                 .id = MFD_I2C_BAR,
 109                 .name = "i2c_designware",
 110                 .acpi_match = &intel_quark_acpi_match_i2c,
 111                 .num_resources = ARRAY_SIZE(intel_quark_i2c_res),
 112                 .resources = intel_quark_i2c_res,
 113                 .ignore_resource_conflicts = true,
 114         },
 115 };
 116
 117 static const struct pci_device_id intel_quark_mfd_ids[] = {
 118         { PCI_VDEVICE(INTEL, 0x0934), },
 119         {},
 120 };
 121 MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids);
 122
 123 static int intel_quark_register_i2c_clk(struct device *dev)
 124 {
 125         struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);
 126         struct clk *i2c_clk;
 127
 128         i2c_clk = clk_register_fixed_rate(dev,
 129                                           INTEL_QUARK_I2C_CONTROLLER_CLK, NULL,
 130                                           0, INTEL_QUARK_I2C_CLK_HZ);
 131         if (IS_ERR(i2c_clk))
 132                 return PTR_ERR(i2c_clk);
 133
 134         quark_mfd->i2c_clk = i2c_clk;
 135         quark_mfd->i2c_clk_lookup = clkdev_create(i2c_clk, NULL,
 136                                                 INTEL_QUARK_I2C_CONTROLLER_CLK);
 137
 138         if (!quark_mfd->i2c_clk_lookup) {
 139                 clk_unregister(quark_mfd->i2c_clk);
 140                 dev_err(dev, "Fixed clk register failed\n");
 141                 return -ENOMEM;
 142         }
 143
 144         return 0;
 145 }
 146
 147 static void intel_quark_unregister_i2c_clk(struct device *dev)
 148 {
 149         struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev);
 150
 151         if (!quark_mfd->i2c_clk_lookup)
 152                 return;
 153
 154         clkdev_drop(quark_mfd->i2c_clk_lookup);
 155         clk_unregister(quark_mfd->i2c_clk);
 156 }
 157
 158 static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
 159 {
 160         const struct dmi_system_id *dmi_id;
 161         struct dw_i2c_platform_data *pdata;
 162         struct resource *res = (struct resource *)cell->resources;
 163         struct device *dev = &pdev->dev;
 164
 165         res[INTEL_QUARK_IORES_MEM].start =
 166                 pci_resource_start(pdev, MFD_I2C_BAR);
 167         res[INTEL_QUARK_IORES_MEM].end =
 168                 pci_resource_end(pdev, MFD_I2C_BAR);
 169
 170         res[INTEL_QUARK_IORES_IRQ].start = pdev->irq;
 171         res[INTEL_QUARK_IORES_IRQ].end = pdev->irq;
 172
 173         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 174         if (!pdata)
 175                 return -ENOMEM;
 176
 177         /* Normal mode by default */
 178         pdata->i2c_scl_freq = 100000;
 179
 180         dmi_id = dmi_first_match(dmi_platform_info);
 181         if (dmi_id)
 182                 pdata->i2c_scl_freq = (uintptr_t)dmi_id->driver_data;
 183
 184         cell->platform_data = pdata;
 185         cell->pdata_size = sizeof(*pdata);
 186
 187         return 0;
 188 }
 189
 190 static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell)
 191 {
 192         struct dwapb_platform_data *pdata;
 193         struct resource *res = (struct resource *)cell->resources;
 194         struct device *dev = &pdev->dev;
 195
 196         res[INTEL_QUARK_IORES_MEM].start =
 197                 pci_resource_start(pdev, MFD_GPIO_BAR);
 198         res[INTEL_QUARK_IORES_MEM].end =
 199                 pci_resource_end(pdev, MFD_GPIO_BAR);
 200
 201         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 202         if (!pdata)
 203                 return -ENOMEM;
 204
 205         /* For intel quark x1000, it has only one port: portA */
 206         pdata->nports = INTEL_QUARK_GPIO_NPORTS;
 207         pdata->properties = devm_kcalloc(dev, pdata->nports,
 208                                          sizeof(*pdata->properties),
 209                                          GFP_KERNEL);
 210         if (!pdata->properties)
 211                 return -ENOMEM;
 212
 213         /* Set the properties for portA */
 214         pdata->properties->fwnode       = NULL;
 215         pdata->properties->idx          = 0;
 216         pdata->properties->ngpio        = INTEL_QUARK_MFD_NGPIO;
 217         pdata->properties->gpio_base    = INTEL_QUARK_MFD_GPIO_BASE;
 218         pdata->properties->irq[0]       = pdev->irq;
 219         pdata->properties->has_irq      = true;
 220         pdata->properties->irq_shared   = true;
 221
 222         cell->platform_data = pdata;
 223         cell->pdata_size = sizeof(*pdata);
 224
 225         return 0;
 226 }
 227
 228 static int intel_quark_mfd_probe(struct pci_dev *pdev,
 229                                  const struct pci_device_id *id)
 230 {
 231         struct intel_quark_mfd *quark_mfd;
 232         int ret;
 233
 234         ret = pcim_enable_device(pdev);
 235         if (ret)
 236                 return ret;
 237
 238         quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL);
 239         if (!quark_mfd)
 240                 return -ENOMEM;
 241
 242         quark_mfd->dev = &pdev->dev;
 243         dev_set_drvdata(&pdev->dev, quark_mfd);
 244
 245         ret = intel_quark_register_i2c_clk(&pdev->dev);
 246         if (ret)
 247                 return ret;
 248
 249         ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[1]);
 250         if (ret)
 251                 goto err_unregister_i2c_clk;
 252
 253         ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[0]);
 254         if (ret)
 255                 goto err_unregister_i2c_clk;
 256
 257         ret = mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
 258                               ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
 259                               NULL);
 260         if (ret)
 261                 goto err_unregister_i2c_clk;
 262
 263         return 0;
 264
 265 err_unregister_i2c_clk:
 266         intel_quark_unregister_i2c_clk(&pdev->dev);
 267         return ret;
 268 }
 269
 270 static void intel_quark_mfd_remove(struct pci_dev *pdev)
 271 {
 272         intel_quark_unregister_i2c_clk(&pdev->dev);
 273         mfd_remove_devices(&pdev->dev);
 274 }
 275
 276 static struct pci_driver intel_quark_mfd_driver = {
 277         .name           = "intel_quark_mfd_i2c_gpio",
 278         .id_table       = intel_quark_mfd_ids,
 279         .probe          = intel_quark_mfd_probe,
 280         .remove         = intel_quark_mfd_remove,
 281 };
 282
 283 module_pci_driver(intel_quark_mfd_driver);
 284
 285 MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
 286 MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO");
 287 MODULE_LICENSE("GPL v2");