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 struct i2c_mode_info { 62 const char *name; 63 unsigned int i2c_scl_freq; 64 }; 65 66 static const struct i2c_mode_info platform_i2c_mode_info[] = { 67 { 68 .name = "Galileo", 69 .i2c_scl_freq = 100000, 70 }, 71 { 72 .name = "GalileoGen2", 73 .i2c_scl_freq = 400000, 74 }, 75 {} 76 }; 77 78 static struct resource intel_quark_i2c_res[] = { 79 [INTEL_QUARK_IORES_MEM] = { 80 .flags = IORESOURCE_MEM, 81 }, 82 [INTEL_QUARK_IORES_IRQ] = { 83 .flags = IORESOURCE_IRQ, 84 }, 85 }; 86 87 static struct mfd_cell_acpi_match intel_quark_acpi_match_i2c = { 88 .adr = MFD_ACPI_MATCH_I2C, 89 }; 90 91 static struct resource intel_quark_gpio_res[] = { 92 [INTEL_QUARK_IORES_MEM] = { 93 .flags = IORESOURCE_MEM, 94 }, 95 }; 96 97 static struct mfd_cell_acpi_match intel_quark_acpi_match_gpio = { 98 .adr = MFD_ACPI_MATCH_GPIO, 99 }; 100 101 static struct mfd_cell intel_quark_mfd_cells[] = { 102 { 103 .id = MFD_GPIO_BAR, 104 .name = "gpio-dwapb", 105 .acpi_match = &intel_quark_acpi_match_gpio, 106 .num_resources = ARRAY_SIZE(intel_quark_gpio_res), 107 .resources = intel_quark_gpio_res, 108 .ignore_resource_conflicts = true, 109 }, 110 { 111 .id = MFD_I2C_BAR, 112 .name = "i2c_designware", 113 .acpi_match = &intel_quark_acpi_match_i2c, 114 .num_resources = ARRAY_SIZE(intel_quark_i2c_res), 115 .resources = intel_quark_i2c_res, 116 .ignore_resource_conflicts = true, 117 }, 118 }; 119 120 static const struct pci_device_id intel_quark_mfd_ids[] = { 121 { PCI_VDEVICE(INTEL, 0x0934), }, 122 {}, 123 }; 124 MODULE_DEVICE_TABLE(pci, intel_quark_mfd_ids); 125 126 static int intel_quark_register_i2c_clk(struct device *dev) 127 { 128 struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev); 129 struct clk *i2c_clk; 130 131 i2c_clk = clk_register_fixed_rate(dev, 132 INTEL_QUARK_I2C_CONTROLLER_CLK, NULL, 133 0, INTEL_QUARK_I2C_CLK_HZ); 134 if (IS_ERR(i2c_clk)) 135 return PTR_ERR(i2c_clk); 136 137 quark_mfd->i2c_clk = i2c_clk; 138 quark_mfd->i2c_clk_lookup = clkdev_create(i2c_clk, NULL, 139 INTEL_QUARK_I2C_CONTROLLER_CLK); 140 141 if (!quark_mfd->i2c_clk_lookup) { 142 clk_unregister(quark_mfd->i2c_clk); 143 dev_err(dev, "Fixed clk register failed\n"); 144 return -ENOMEM; 145 } 146 147 return 0; 148 } 149 150 static void intel_quark_unregister_i2c_clk(struct device *dev) 151 { 152 struct intel_quark_mfd *quark_mfd = dev_get_drvdata(dev); 153 154 if (!quark_mfd->i2c_clk_lookup) 155 return; 156 157 clkdev_drop(quark_mfd->i2c_clk_lookup); 158 clk_unregister(quark_mfd->i2c_clk); 159 } 160 161 static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell) 162 { 163 const char *board_name = dmi_get_system_info(DMI_BOARD_NAME); 164 const struct i2c_mode_info *info; 165 struct dw_i2c_platform_data *pdata; 166 struct resource *res = (struct resource *)cell->resources; 167 struct device *dev = &pdev->dev; 168 169 res[INTEL_QUARK_IORES_MEM].start = 170 pci_resource_start(pdev, MFD_I2C_BAR); 171 res[INTEL_QUARK_IORES_MEM].end = 172 pci_resource_end(pdev, MFD_I2C_BAR); 173 174 res[INTEL_QUARK_IORES_IRQ].start = pdev->irq; 175 res[INTEL_QUARK_IORES_IRQ].end = pdev->irq; 176 177 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 178 if (!pdata) 179 return -ENOMEM; 180 181 /* Normal mode by default */ 182 pdata->i2c_scl_freq = 100000; 183 184 if (board_name) { 185 for (info = platform_i2c_mode_info; info->name; info++) { 186 if (!strcmp(board_name, info->name)) { 187 pdata->i2c_scl_freq = info->i2c_scl_freq; 188 break; 189 } 190 } 191 } 192 193 cell->platform_data = pdata; 194 cell->pdata_size = sizeof(*pdata); 195 196 return 0; 197 } 198 199 static int intel_quark_gpio_setup(struct pci_dev *pdev, struct mfd_cell *cell) 200 { 201 struct dwapb_platform_data *pdata; 202 struct resource *res = (struct resource *)cell->resources; 203 struct device *dev = &pdev->dev; 204 205 res[INTEL_QUARK_IORES_MEM].start = 206 pci_resource_start(pdev, MFD_GPIO_BAR); 207 res[INTEL_QUARK_IORES_MEM].end = 208 pci_resource_end(pdev, MFD_GPIO_BAR); 209 210 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 211 if (!pdata) 212 return -ENOMEM; 213 214 /* For intel quark x1000, it has only one port: portA */ 215 pdata->nports = INTEL_QUARK_GPIO_NPORTS; 216 pdata->properties = devm_kcalloc(dev, pdata->nports, 217 sizeof(*pdata->properties), 218 GFP_KERNEL); 219 if (!pdata->properties) 220 return -ENOMEM; 221 222 /* Set the properties for portA */ 223 pdata->properties->fwnode = NULL; 224 pdata->properties->idx = 0; 225 pdata->properties->ngpio = INTEL_QUARK_MFD_NGPIO; 226 pdata->properties->gpio_base = INTEL_QUARK_MFD_GPIO_BASE; 227 pdata->properties->irq = pdev->irq; 228 pdata->properties->irq_shared = true; 229 230 cell->platform_data = pdata; 231 cell->pdata_size = sizeof(*pdata); 232 233 return 0; 234 } 235 236 static int intel_quark_mfd_probe(struct pci_dev *pdev, 237 const struct pci_device_id *id) 238 { 239 struct intel_quark_mfd *quark_mfd; 240 int ret; 241 242 ret = pcim_enable_device(pdev); 243 if (ret) 244 return ret; 245 246 quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd), GFP_KERNEL); 247 if (!quark_mfd) 248 return -ENOMEM; 249 250 quark_mfd->dev = &pdev->dev; 251 dev_set_drvdata(&pdev->dev, quark_mfd); 252 253 ret = intel_quark_register_i2c_clk(&pdev->dev); 254 if (ret) 255 return ret; 256 257 ret = intel_quark_i2c_setup(pdev, &intel_quark_mfd_cells[1]); 258 if (ret) 259 goto err_unregister_i2c_clk; 260 261 ret = intel_quark_gpio_setup(pdev, &intel_quark_mfd_cells[0]); 262 if (ret) 263 goto err_unregister_i2c_clk; 264 265 ret = mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells, 266 ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0, 267 NULL); 268 if (ret) 269 goto err_unregister_i2c_clk; 270 271 return 0; 272 273 err_unregister_i2c_clk: 274 intel_quark_unregister_i2c_clk(&pdev->dev); 275 return ret; 276 } 277 278 static void intel_quark_mfd_remove(struct pci_dev *pdev) 279 { 280 intel_quark_unregister_i2c_clk(&pdev->dev); 281 mfd_remove_devices(&pdev->dev); 282 } 283 284 static struct pci_driver intel_quark_mfd_driver = { 285 .name = "intel_quark_mfd_i2c_gpio", 286 .id_table = intel_quark_mfd_ids, 287 .probe = intel_quark_mfd_probe, 288 .remove = intel_quark_mfd_remove, 289 }; 290 291 module_pci_driver(intel_quark_mfd_driver); 292 293 MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>"); 294 MODULE_DESCRIPTION("Intel Quark MFD PCI driver for I2C & GPIO"); 295 MODULE_LICENSE("GPL v2"); 296