1 /* 2 * Intel Quark MFD PCI driver for I2C & GPIO 3 * 4 * Copyright(c) 2014 Intel Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * Intel Quark PCI device for I2C and GPIO controller sharing the same 16 * PCI function. This PCI driver will split the 2 devices into their 17 * respective drivers. 18 */ 19 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/pci.h> 23 #include <linux/mfd/core.h> 24 #include <linux/clkdev.h> 25 #include <linux/clk-provider.h> 26 #include <linux/dmi.h> 27 #include <linux/platform_data/gpio-dwapb.h> 28 #include <linux/platform_data/i2c-designware.h> 29 30 /* PCI BAR for register base address */ 31 #define MFD_I2C_BAR 0 32 #define MFD_GPIO_BAR 1 33 34 /* ACPI _ADR value to match the child node */ 35 #define MFD_ACPI_MATCH_GPIO 0ULL 36 #define MFD_ACPI_MATCH_I2C 1ULL 37 38 /* The base GPIO number under GPIOLIB framework */ 39 #define INTEL_QUARK_MFD_GPIO_BASE 8 40 41 /* The default number of South-Cluster GPIO on Quark. */ 42 #define INTEL_QUARK_MFD_NGPIO 8 43 44 /* The DesignWare GPIO ports on Quark. */ 45 #define INTEL_QUARK_GPIO_NPORTS 1 46 47 #define INTEL_QUARK_IORES_MEM 0 48 #define INTEL_QUARK_IORES_IRQ 1 49 50 #define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0" 51 52 /* The Quark I2C controller source clock */ 53 #define INTEL_QUARK_I2C_CLK_HZ 33000000 54 55 struct intel_quark_mfd { 56 struct device *dev; 57 struct clk *i2c_clk; 58 struct clk_lookup *i2c_clk_lookup; 59 }; 60 61 static const struct dmi_system_id dmi_platform_info[] = { 62 { 63 .matches = { 64 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Galileo"), 65 }, 66 .driver_data = (void *)100000, 67 }, 68 { 69 .matches = { 70 DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"), 71 }, 72 .driver_data = (void *)400000, 73 }, 74 {} 75 }; 76 77 static struct resource intel_quark_i2c_res[] = { 78 [INTEL_QUARK_IORES_MEM] = { 79 .flags = IORESOURCE_MEM, 80 }, 81 [INTEL_QUARK_IORES_IRQ] = { 82 .flags = IORESOURCE_IRQ, 83 }, 84 }; 85 86 static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = { 87 .adr = MFD_ACPI_MATCH_I2C, 88 }; 89 90 static struct resource intel_quark_gpio_res[] = { 91 [INTEL_QUARK_IORES_MEM] = { 92 .flags = IORESOURCE_MEM, 93 }, 94 }; 95 96 static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = { 97 .adr = MFD_ACPI_MATCH_GPIO, 98 }; 99 100 static struct mfd_cell intel_quark_mfd_cells[] = { 101 { 102 .id = MFD_GPIO_BAR, 103 .name = "gpio-dwapb", 104 .acpi_match = &intel_quark_acpi_match_gpio, 105 .num_resources = ARRAY_SIZE(intel_quark_gpio_res), 106 .resources = intel_quark_gpio_res, 107 .ignore_resource_conflicts = true, 108 }, 109 { 110 .id = MFD_I2C_BAR, 111 .name = "i2c_designware", 112 .acpi_match = &intel_quark_acpi_match_i2c, 113 .num_resources = ARRAY_SIZE(intel_quark_i2c_res), 114 .resources = intel_quark_i2c_res, 115 .ignore_resource_conflicts = true, 116 }, 117 }; 118 119 static const struct pci_device_id intel_quark_mfd_ids[] = { 120 { PCI_VDEVICE(INTEL, 0x0934), }, 121 {}, 122 }; 123 MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids); 124 125 static int intel_quark_register_i2c_clk(struct device *dev) 126 { 127 struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev); 128 struct clk *i2c_clk; 129 130 i2c_clk = clk_register_fixed_rate(dev, 131 INTEL_QUARK_I2C_CONTROLLER_CLK, NULL, 132 0, INTEL_QUARK_I2C_CLK_HZ); 133 if (IS_ERR(i2c_clk)) 134 return PTR_ERR(i2c_clk); 135 136 quark_mfd->i2c_clk = i2c_clk; 137 quark_mfd->i2c_clk_lookup = clkdev_create(i2c_clk, NULL, 138 INTEL_QUARK_I2C_CONTROLLER_CLK); 139 140 if (!quark_mfd->i2c_clk_lookup) { 141 clk_unregister(quark_mfd->i2c_clk); 142 dev_err(dev, "Fixed clk register failed\n"); 143 return -ENOMEM; 144 } 145 146 return 0; 147 } 148 149 static void intel_quark_unregister_i2c_clk(struct device *dev) 150 { 151 struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev); 152 153 if (!quark_mfd->i2c_clk_lookup) 154 return; 155 156 clkdev_drop(quark_mfd->i2c_clk_lookup); 157 clk_unregister(quark_mfd->i2c_clk); 158 } 159 160 static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell) 161 { 162 const struct dmi_system_id *dmi_id; 163 struct dw_i2c_platform_data *pdata; 164 struct resource *res = (struct resource *)cell->resources; 165 struct device *dev = &pdev->dev; 166 167 res[INTEL_QUARK_IORES_MEM].start = 168 pci_resource_start(pdev, MFD_I2C_BAR); 169 res[INTEL_QUARK_IORES_MEM].end = 170 pci_resource_end(pdev, MFD_I2C_BAR); 171 172 res[INTEL_QUARK_IORES_IRQ].start = pdev->irq; 173 res[INTEL_QUARK_IORES_IRQ].end = pdev->irq; 174 175 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 176 if (!pdata) 177 return -ENOMEM; 178 179 /* Normal mode by default */ 180 pdata->i2c_scl_freq = 100000; 181 182 dmi_id = dmi_first_match(dmi_platform_info); 183 if (dmi_id) 184 pdata->i2c_scl_freq = (uintptr_t)dmi_id->driver_data; 185 186 cell->platform_data = pdata; 187 cell->pdata_size = sizeof(*pdata); 188 189 return 0; 190 } 191 192 static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell) 193 { 194 struct dwapb_platform_data *pdata; 195 struct resource *res = (struct resource *)cell->resources; 196 struct device *dev = &pdev->dev; 197 198 res[INTEL_QUARK_IORES_MEM].start = 199 pci_resource_start(pdev, MFD_GPIO_BAR); 200 res[INTEL_QUARK_IORES_MEM].end = 201 pci_resource_end(pdev, MFD_GPIO_BAR); 202 203 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 204 if (!pdata) 205 return -ENOMEM; 206 207 /* For intel quark x1000, it has only one port: portA */ 208 pdata->nports = INTEL_QUARK_GPIO_NPORTS; 209 pdata->properties = devm_kcalloc(dev, pdata->nports, 210 sizeof(*pdata->properties), 211 GFP_KERNEL); 212 if (!pdata->properties) 213 return -ENOMEM; 214 215 /* Set the properties for portA */ 216 pdata->properties->fwnode = NULL; 217 pdata->properties->idx = 0; 218 pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO; 219 pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE; 220 pdata->properties->irq = pdev->irq; 221 pdata->properties->irq_shared = true; 222 223 cell->platform_data = pdata; 224 cell->pdata_size = sizeof(*pdata); 225 226 return 0; 227 } 228 229 static int intel_quark_mfd_probe(struct pci_dev *pdev, 230 const struct pci_device_id *id) 231 { 232 struct intel_quark_mfd *quark_mfd; 233 int ret; 234 235 ret = pcim_enable_device(pdev); 236 if (ret) 237 return ret; 238 239 quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL); 240 if (!quark_mfd) 241 return -ENOMEM; 242 243 quark_mfd->dev = &pdev->dev; 244 dev_set_drvdata(&pdev->dev, quark_mfd); 245 246 ret = intel_quark_register_i2c_clk(&pdev->dev); 247 if (ret) 248 return ret; 249 250 ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[1]); 251 if (ret) 252 goto err_unregister_i2c_clk; 253 254 ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[0]); 255 if (ret) 256 goto err_unregister_i2c_clk; 257 258 ret = mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells, 259 ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0, 260 NULL); 261 if (ret) 262 goto err_unregister_i2c_clk; 263 264 return 0; 265 266 err_unregister_i2c_clk: 267 intel_quark_unregister_i2c_clk(&pdev->dev); 268 return ret; 269 } 270 271 static void intel_quark_mfd_remove(struct pci_dev *pdev) 272 { 273 intel_quark_unregister_i2c_clk(&pdev->dev); 274 mfd_remove_devices(&pdev->dev); 275 } 276 277 static struct pci_driver intel_quark_mfd_driver = { 278 .name = "intel_quark_mfd_i2c_gpio", 279 .id_table = intel_quark_mfd_ids, 280 .probe = intel_quark_mfd_probe, 281 .remove = intel_quark_mfd_remove, 282 }; 283 284 module_pci_driver(intel_quark_mfd_driver); 285 286 MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>"); 287 MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO"); 288 MODULE_LICENSE("GPL v2"); 289