1 /* 2 * Copyright (C) 2016 Google, Inc 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <fdtdec.h> 11 #include <pch.h> 12 #include <pci.h> 13 #include <asm/cpu.h> 14 #include <asm/gpio.h> 15 #include <asm/io.h> 16 #include <asm/pci.h> 17 #include <asm/arch/gpio.h> 18 #include <dt-bindings/gpio/x86-gpio.h> 19 #include <dm/pinctrl.h> 20 21 DECLARE_GLOBAL_DATA_PTR; 22 23 enum { 24 MAX_GPIOS = 95, 25 }; 26 27 #define PIRQ_SHIFT 16 28 #define CONF_MASK 0xffff 29 30 struct pin_info { 31 int node; 32 int phandle; 33 bool mode_gpio; 34 bool dir_input; 35 bool invert; 36 bool trigger_level; 37 bool output_high; 38 bool sense_disable; 39 bool owner_gpio; 40 bool route_smi; 41 bool irq_enable; 42 bool reset_rsmrst; 43 bool pirq_apic_route; 44 }; 45 46 static int broadwell_pinctrl_read_configs(struct udevice *dev, 47 struct pin_info *conf, int max_pins) 48 { 49 const void *blob = gd->fdt_blob; 50 int count = 0; 51 int node; 52 53 debug("%s: starting\n", __func__); 54 for (node = fdt_first_subnode(blob, dev_of_offset(dev)); 55 node > 0; 56 node = fdt_next_subnode(blob, node)) { 57 int phandle = fdt_get_phandle(blob, node); 58 59 if (!phandle) 60 continue; 61 if (count == max_pins) 62 return -ENOSPC; 63 64 /* We've found a new configuration */ 65 memset(conf, '\0', sizeof(*conf)); 66 conf->node = node; 67 conf->phandle = phandle; 68 conf->mode_gpio = fdtdec_get_bool(blob, node, "mode-gpio"); 69 if (fdtdec_get_int(blob, node, "direction", -1) == PIN_INPUT) 70 conf->dir_input = true; 71 conf->invert = fdtdec_get_bool(blob, node, "invert"); 72 if (fdtdec_get_int(blob, node, "trigger", -1) == TRIGGER_LEVEL) 73 conf->trigger_level = true; 74 if (fdtdec_get_int(blob, node, "output-value", -1) == 1) 75 conf->output_high = true; 76 conf->sense_disable = fdtdec_get_bool(blob, node, 77 "sense-disable"); 78 if (fdtdec_get_int(blob, node, "owner", -1) == OWNER_GPIO) 79 conf->owner_gpio = true; 80 if (fdtdec_get_int(blob, node, "route", -1) == ROUTE_SMI) 81 conf->route_smi = true; 82 conf->irq_enable = fdtdec_get_bool(blob, node, "irq-enable"); 83 conf->reset_rsmrst = fdtdec_get_bool(blob, node, 84 "reset-rsmrst"); 85 if (fdtdec_get_int(blob, node, "pirq-apic", -1) == 86 PIRQ_APIC_ROUTE) 87 conf->pirq_apic_route = true; 88 debug("config: phandle=%d\n", phandle); 89 count++; 90 conf++; 91 } 92 debug("%s: Found %d configurations\n", __func__, count); 93 94 return count; 95 } 96 97 static int broadwell_pinctrl_lookup_phandle(struct pin_info *conf, 98 int conf_count, int phandle) 99 { 100 int i; 101 102 for (i = 0; i < conf_count; i++) { 103 if (conf[i].phandle == phandle) 104 return i; 105 } 106 107 return -ENOENT; 108 } 109 110 static int broadwell_pinctrl_read_pins(struct udevice *dev, 111 struct pin_info *conf, int conf_count, int gpio_conf[], 112 int num_gpios) 113 { 114 const void *blob = gd->fdt_blob; 115 int count = 0; 116 int node; 117 118 for (node = fdt_first_subnode(blob, dev_of_offset(dev)); 119 node > 0; 120 node = fdt_next_subnode(blob, node)) { 121 int len, i; 122 const u32 *prop = fdt_getprop(blob, node, "config", &len); 123 124 if (!prop) 125 continue; 126 127 /* There are three cells per pin */ 128 count = len / (sizeof(u32) * 3); 129 debug("Found %d GPIOs to configure\n", count); 130 for (i = 0; i < count; i++) { 131 uint gpio = fdt32_to_cpu(prop[i * 3]); 132 uint phandle = fdt32_to_cpu(prop[i * 3 + 1]); 133 int val; 134 135 if (gpio >= num_gpios) { 136 debug("%s: GPIO %d out of range\n", __func__, 137 gpio); 138 return -EDOM; 139 } 140 val = broadwell_pinctrl_lookup_phandle(conf, conf_count, 141 phandle); 142 if (val < 0) { 143 debug("%s: Cannot find phandle %d\n", __func__, 144 phandle); 145 return -EINVAL; 146 } 147 gpio_conf[gpio] = val | 148 fdt32_to_cpu(prop[i * 3 + 2]) << PIRQ_SHIFT; 149 } 150 } 151 152 return 0; 153 } 154 155 static void broadwell_pinctrl_commit(struct pch_lp_gpio_regs *regs, 156 struct pin_info *pin_info, 157 int gpio_conf[], int count) 158 { 159 u32 owner_gpio[GPIO_BANKS] = {0}; 160 u32 route_smi[GPIO_BANKS] = {0}; 161 u32 irq_enable[GPIO_BANKS] = {0}; 162 u32 reset_rsmrst[GPIO_BANKS] = {0}; 163 u32 pirq2apic = 0; 164 int set, bit, gpio = 0; 165 166 for (gpio = 0; gpio < MAX_GPIOS; gpio++) { 167 int confnum = gpio_conf[gpio] & CONF_MASK; 168 struct pin_info *pin = &pin_info[confnum]; 169 u32 val; 170 171 val = pin->mode_gpio << CONFA_MODE_SHIFT | 172 pin->dir_input << CONFA_DIR_SHIFT | 173 pin->invert << CONFA_INVERT_SHIFT | 174 pin->trigger_level << CONFA_TRIGGER_SHIFT | 175 pin->output_high << CONFA_OUTPUT_SHIFT; 176 outl(val, ®s->config[gpio].conf_a); 177 outl(pin->sense_disable << CONFB_SENSE_SHIFT, 178 ®s->config[gpio].conf_b); 179 180 /* Determine set and bit based on GPIO number */ 181 set = gpio / GPIO_PER_BANK; 182 bit = gpio % GPIO_PER_BANK; 183 184 /* Apply settings to set specific bits */ 185 owner_gpio[set] |= pin->owner_gpio << bit; 186 route_smi[set] |= pin->route_smi << bit; 187 irq_enable[set] |= pin->irq_enable << bit; 188 reset_rsmrst[set] |= pin->reset_rsmrst << bit; 189 190 /* PIRQ to IO-APIC map */ 191 if (pin->pirq_apic_route) 192 pirq2apic |= gpio_conf[gpio] >> PIRQ_SHIFT; 193 debug("gpio %d: conf %d, mode_gpio %d, dir_input %d, output_high %d\n", 194 gpio, confnum, pin->mode_gpio, pin->dir_input, 195 pin->output_high); 196 } 197 198 for (set = 0; set < GPIO_BANKS; set++) { 199 outl(owner_gpio[set], ®s->own[set]); 200 outl(route_smi[set], ®s->gpi_route[set]); 201 outl(irq_enable[set], ®s->gpi_ie[set]); 202 outl(reset_rsmrst[set], ®s->rst_sel[set]); 203 } 204 205 outl(pirq2apic, ®s->pirq_to_ioxapic); 206 } 207 208 static int broadwell_pinctrl_probe(struct udevice *dev) 209 { 210 struct pch_lp_gpio_regs *regs; 211 struct pin_info conf[12]; 212 int gpio_conf[MAX_GPIOS]; 213 struct udevice *pch; 214 int conf_count; 215 u32 gpiobase; 216 int ret; 217 218 ret = uclass_first_device(UCLASS_PCH, &pch); 219 if (ret) 220 return ret; 221 if (!pch) 222 return -ENODEV; 223 debug("%s: start\n", __func__); 224 225 /* Only init once, before relocation */ 226 if (gd->flags & GD_FLG_RELOC) 227 return 0; 228 229 /* 230 * Get the memory/io base address to configure every pins. 231 * IOBASE is used to configure the mode/pads 232 * GPIOBASE is used to configure the direction and default value 233 */ 234 ret = pch_get_gpio_base(pch, &gpiobase); 235 if (ret) { 236 debug("%s: invalid GPIOBASE address (%08x)\n", __func__, 237 gpiobase); 238 return -EINVAL; 239 } 240 241 conf_count = broadwell_pinctrl_read_configs(dev, conf, 242 ARRAY_SIZE(conf)); 243 if (conf_count < 0) { 244 debug("%s: Cannot read configs: err=%d\n", __func__, ret); 245 return conf_count; 246 } 247 248 /* 249 * Assume that pin settings are provided for every pin. Pins not 250 * mentioned will get the first config mentioned in the list. 251 */ 252 ret = broadwell_pinctrl_read_pins(dev, conf, conf_count, gpio_conf, 253 MAX_GPIOS); 254 if (ret) { 255 debug("%s: Cannot read pin settings: err=%d\n", __func__, ret); 256 return ret; 257 } 258 259 regs = (struct pch_lp_gpio_regs *)gpiobase; 260 broadwell_pinctrl_commit(regs, conf, gpio_conf, ARRAY_SIZE(conf)); 261 262 debug("%s: done\n", __func__); 263 264 return 0; 265 } 266 267 static const struct udevice_id broadwell_pinctrl_match[] = { 268 { .compatible = "intel,x86-broadwell-pinctrl", 269 .data = X86_SYSCON_PINCONF }, 270 { /* sentinel */ } 271 }; 272 273 U_BOOT_DRIVER(broadwell_pinctrl) = { 274 .name = "broadwell_pinctrl", 275 .id = UCLASS_SYSCON, 276 .of_match = broadwell_pinctrl_match, 277 .probe = broadwell_pinctrl_probe, 278 }; 279