1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (c) 2013 Broadcom 4 * Copyright (C) 2020 Rafa�� Mi��ecki <rafal@milecki.pl> 5 */ 6 7#include <dt-bindings/soc/bcm-pmb.h> 8#include <linux/io.h> 9#include <linux/module.h> 10#include <linux/of.h> 11#include <linux/platform_device.h> 12#include <linux/pm_domain.h> 13#include <linux/reset/bcm63xx_pmb.h> 14 15#define BPCM_ID_REG 0x00 16#define BPCM_CAPABILITIES 0x04 17#define BPCM_CAP_NUM_ZONES 0x000000ff 18#define BPCM_CAP_SR_REG_BITS 0x0000ff00 19#define BPCM_CAP_PLLTYPE 0x00030000 20#define BPCM_CAP_UBUS 0x00080000 21#define BPCM_CONTROL 0x08 22#define BPCM_STATUS 0x0c 23#define BPCM_ROSC_CONTROL 0x10 24#define BPCM_ROSC_THRESH_H 0x14 25#define BPCM_ROSC_THRESHOLD_BCM6838 0x14 26#define BPCM_ROSC_THRESH_S 0x18 27#define BPCM_ROSC_COUNT_BCM6838 0x18 28#define BPCM_ROSC_COUNT 0x1c 29#define BPCM_PWD_CONTROL_BCM6838 0x1c 30#define BPCM_PWD_CONTROL 0x20 31#define BPCM_SR_CONTROL_BCM6838 0x20 32#define BPCM_PWD_ACCUM_CONTROL 0x24 33#define BPCM_SR_CONTROL 0x28 34#define BPCM_GLOBAL_CONTROL 0x2c 35#define BPCM_MISC_CONTROL 0x30 36#define BPCM_MISC_CONTROL2 0x34 37#define BPCM_SGPHY_CNTL 0x38 38#define BPCM_SGPHY_STATUS 0x3c 39#define BPCM_ZONE0 0x40 40#define BPCM_ZONE_CONTROL 0x00 41#define BPCM_ZONE_CONTROL_MANUAL_CLK_EN 0x00000001 42#define BPCM_ZONE_CONTROL_MANUAL_RESET_CTL 0x00000002 43#define BPCM_ZONE_CONTROL_FREQ_SCALE_USED 0x00000004 /* R/O */ 44#define BPCM_ZONE_CONTROL_DPG_CAPABLE 0x00000008 /* R/O */ 45#define BPCM_ZONE_CONTROL_MANUAL_MEM_PWR 0x00000030 46#define BPCM_ZONE_CONTROL_MANUAL_ISO_CTL 0x00000040 47#define BPCM_ZONE_CONTROL_MANUAL_CTL 0x00000080 48#define BPCM_ZONE_CONTROL_DPG_CTL_EN 0x00000100 49#define BPCM_ZONE_CONTROL_PWR_DN_REQ 0x00000200 50#define BPCM_ZONE_CONTROL_PWR_UP_REQ 0x00000400 51#define BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN 0x00000800 52#define BPCM_ZONE_CONTROL_BLK_RESET_ASSERT 0x00001000 53#define BPCM_ZONE_CONTROL_MEM_STBY 0x00002000 54#define BPCM_ZONE_CONTROL_RESERVED 0x0007c000 55#define BPCM_ZONE_CONTROL_PWR_CNTL_STATE 0x00f80000 56#define BPCM_ZONE_CONTROL_FREQ_SCALAR_DYN_SEL 0x01000000 /* R/O */ 57#define BPCM_ZONE_CONTROL_PWR_OFF_STATE 0x02000000 /* R/O */ 58#define BPCM_ZONE_CONTROL_PWR_ON_STATE 0x04000000 /* R/O */ 59#define BPCM_ZONE_CONTROL_PWR_GOOD 0x08000000 /* R/O */ 60#define BPCM_ZONE_CONTROL_DPG_PWR_STATE 0x10000000 /* R/O */ 61#define BPCM_ZONE_CONTROL_MEM_PWR_STATE 0x20000000 /* R/O */ 62#define BPCM_ZONE_CONTROL_ISO_STATE 0x40000000 /* R/O */ 63#define BPCM_ZONE_CONTROL_RESET_STATE 0x80000000 /* R/O */ 64#define BPCM_ZONE_CONFIG1 0x04 65#define BPCM_ZONE_CONFIG2 0x08 66#define BPCM_ZONE_FREQ_SCALAR_CONTROL 0x0c 67#define BPCM_ZONE_SIZE 0x10 68 69struct bcm_pmb { 70 struct device *dev; 71 void __iomem *base; 72 spinlock_t lock; 73 bool little_endian; 74 struct genpd_onecell_data genpd_onecell_data; 75}; 76 77struct bcm_pmb_pd_data { 78 const char * const name; 79 int id; 80 u8 bus; 81 u8 device; 82}; 83 84struct bcm_pmb_pm_domain { 85 struct bcm_pmb *pmb; 86 const struct bcm_pmb_pd_data *data; 87 struct generic_pm_domain genpd; 88}; 89 90static int bcm_pmb_bpcm_read(struct bcm_pmb *pmb, int bus, u8 device, 91 int offset, u32 *val) 92{ 93 void __iomem *base = pmb->base + bus * 0x20; 94 unsigned long flags; 95 int err; 96 97 spin_lock_irqsave(&pmb->lock, flags); 98 err = bpcm_rd(base, device, offset, val); 99 spin_unlock_irqrestore(&pmb->lock, flags); 100 101 if (!err) 102 *val = pmb->little_endian ? le32_to_cpu(*val) : be32_to_cpu(*val); 103 104 return err; 105} 106 107static int bcm_pmb_bpcm_write(struct bcm_pmb *pmb, int bus, u8 device, 108 int offset, u32 val) 109{ 110 void __iomem *base = pmb->base + bus * 0x20; 111 unsigned long flags; 112 int err; 113 114 val = pmb->little_endian ? cpu_to_le32(val) : cpu_to_be32(val); 115 116 spin_lock_irqsave(&pmb->lock, flags); 117 err = bpcm_wr(base, device, offset, val); 118 spin_unlock_irqrestore(&pmb->lock, flags); 119 120 return err; 121} 122 123static int bcm_pmb_power_off_zone(struct bcm_pmb *pmb, int bus, u8 device, 124 int zone) 125{ 126 int offset; 127 u32 val; 128 int err; 129 130 offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL; 131 132 err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val); 133 if (err) 134 return err; 135 136 val |= BPCM_ZONE_CONTROL_PWR_DN_REQ; 137 val &= ~BPCM_ZONE_CONTROL_PWR_UP_REQ; 138 139 err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val); 140 141 return err; 142} 143 144static int bcm_pmb_power_on_zone(struct bcm_pmb *pmb, int bus, u8 device, 145 int zone) 146{ 147 int offset; 148 u32 val; 149 int err; 150 151 offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL; 152 153 err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val); 154 if (err) 155 return err; 156 157 if (!(val & BPCM_ZONE_CONTROL_PWR_ON_STATE)) { 158 val &= ~BPCM_ZONE_CONTROL_PWR_DN_REQ; 159 val |= BPCM_ZONE_CONTROL_DPG_CTL_EN; 160 val |= BPCM_ZONE_CONTROL_PWR_UP_REQ; 161 val |= BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN; 162 val |= BPCM_ZONE_CONTROL_BLK_RESET_ASSERT; 163 164 err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val); 165 } 166 167 return err; 168} 169 170static int bcm_pmb_power_off_device(struct bcm_pmb *pmb, int bus, u8 device) 171{ 172 int offset; 173 u32 val; 174 int err; 175 176 /* Entire device can be powered off by powering off the 0th zone */ 177 offset = BPCM_ZONE0 + BPCM_ZONE_CONTROL; 178 179 err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val); 180 if (err) 181 return err; 182 183 if (!(val & BPCM_ZONE_CONTROL_PWR_OFF_STATE)) { 184 val = BPCM_ZONE_CONTROL_PWR_DN_REQ; 185 186 err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val); 187 } 188 189 return err; 190} 191 192static int bcm_pmb_power_on_device(struct bcm_pmb *pmb, int bus, u8 device) 193{ 194 u32 val; 195 int err; 196 int i; 197 198 err = bcm_pmb_bpcm_read(pmb, bus, device, BPCM_CAPABILITIES, &val); 199 if (err) 200 return err; 201 202 for (i = 0; i < (val & BPCM_CAP_NUM_ZONES); i++) { 203 err = bcm_pmb_power_on_zone(pmb, bus, device, i); 204 if (err) 205 return err; 206 } 207 208 return err; 209} 210 211static int bcm_pmb_power_on_sata(struct bcm_pmb *pmb, int bus, u8 device) 212{ 213 int err; 214 215 err = bcm_pmb_power_on_zone(pmb, bus, device, 0); 216 if (err) 217 return err; 218 219 /* Does not apply to the BCM963158 */ 220 err = bcm_pmb_bpcm_write(pmb, bus, device, BPCM_MISC_CONTROL, 0); 221 if (err) 222 return err; 223 224 err = bcm_pmb_bpcm_write(pmb, bus, device, BPCM_SR_CONTROL, 0xffffffff); 225 if (err) 226 return err; 227 228 err = bcm_pmb_bpcm_write(pmb, bus, device, BPCM_SR_CONTROL, 0); 229 230 return err; 231} 232 233static int bcm_pmb_power_on(struct generic_pm_domain *genpd) 234{ 235 struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd); 236 const struct bcm_pmb_pd_data *data = pd->data; 237 struct bcm_pmb *pmb = pd->pmb; 238 239 switch (data->id) { 240 case BCM_PMB_PCIE0: 241 case BCM_PMB_PCIE1: 242 case BCM_PMB_PCIE2: 243 return bcm_pmb_power_on_zone(pmb, data->bus, data->device, 0); 244 case BCM_PMB_HOST_USB: 245 return bcm_pmb_power_on_device(pmb, data->bus, data->device); 246 case BCM_PMB_SATA: 247 return bcm_pmb_power_on_sata(pmb, data->bus, data->device); 248 default: 249 dev_err(pmb->dev, "unsupported device id: %d\n", data->id); 250 return -EINVAL; 251 } 252} 253 254static int bcm_pmb_power_off(struct generic_pm_domain *genpd) 255{ 256 struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd); 257 const struct bcm_pmb_pd_data *data = pd->data; 258 struct bcm_pmb *pmb = pd->pmb; 259 260 switch (data->id) { 261 case BCM_PMB_PCIE0: 262 case BCM_PMB_PCIE1: 263 case BCM_PMB_PCIE2: 264 return bcm_pmb_power_off_zone(pmb, data->bus, data->device, 0); 265 case BCM_PMB_HOST_USB: 266 return bcm_pmb_power_off_device(pmb, data->bus, data->device); 267 default: 268 dev_err(pmb->dev, "unsupported device id: %d\n", data->id); 269 return -EINVAL; 270 } 271} 272 273static int bcm_pmb_probe(struct platform_device *pdev) 274{ 275 struct device *dev = &pdev->dev; 276 const struct bcm_pmb_pd_data *table; 277 const struct bcm_pmb_pd_data *e; 278 struct bcm_pmb *pmb; 279 int max_id; 280 int err; 281 282 pmb = devm_kzalloc(dev, sizeof(*pmb), GFP_KERNEL); 283 if (!pmb) 284 return -ENOMEM; 285 286 pmb->dev = dev; 287 288 pmb->base = devm_platform_ioremap_resource(pdev, 0); 289 if (IS_ERR(pmb->base)) 290 return PTR_ERR(pmb->base); 291 292 spin_lock_init(&pmb->lock); 293 294 pmb->little_endian = !of_device_is_big_endian(dev->of_node); 295 296 table = of_device_get_match_data(dev); 297 if (!table) 298 return -EINVAL; 299 300 max_id = 0; 301 for (e = table; e->name; e++) 302 max_id = max(max_id, e->id); 303 304 pmb->genpd_onecell_data.num_domains = max_id + 1; 305 pmb->genpd_onecell_data.domains = 306 devm_kcalloc(dev, pmb->genpd_onecell_data.num_domains, 307 sizeof(struct generic_pm_domain *), GFP_KERNEL); 308 if (!pmb->genpd_onecell_data.domains) 309 return -ENOMEM; 310 311 for (e = table; e->name; e++) { 312 struct bcm_pmb_pm_domain *pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); 313 314 if (!pd) 315 return -ENOMEM; 316 317 pd->pmb = pmb; 318 pd->data = e; 319 pd->genpd.name = e->name; 320 pd->genpd.power_on = bcm_pmb_power_on; 321 pd->genpd.power_off = bcm_pmb_power_off; 322 323 pm_genpd_init(&pd->genpd, NULL, true); 324 pmb->genpd_onecell_data.domains[e->id] = &pd->genpd; 325 } 326 327 err = of_genpd_add_provider_onecell(dev->of_node, &pmb->genpd_onecell_data); 328 if (err) { 329 dev_err(dev, "failed to add genpd provider: %d\n", err); 330 return err; 331 } 332 333 return 0; 334} 335 336static const struct bcm_pmb_pd_data bcm_pmb_bcm4908_data[] = { 337 { .name = "pcie2", .id = BCM_PMB_PCIE2, .bus = 0, .device = 2, }, 338 { .name = "pcie0", .id = BCM_PMB_PCIE0, .bus = 1, .device = 14, }, 339 { .name = "pcie1", .id = BCM_PMB_PCIE1, .bus = 1, .device = 15, }, 340 { .name = "usb", .id = BCM_PMB_HOST_USB, .bus = 1, .device = 17, }, 341 { }, 342}; 343 344static const struct bcm_pmb_pd_data bcm_pmb_bcm63138_data[] = { 345 { .name = "sata", .id = BCM_PMB_SATA, .bus = 0, .device = 3, }, 346 { }, 347}; 348 349static const struct of_device_id bcm_pmb_of_match[] = { 350 { .compatible = "brcm,bcm4908-pmb", .data = &bcm_pmb_bcm4908_data, }, 351 { .compatible = "brcm,bcm63138-pmb", .data = &bcm_pmb_bcm63138_data, }, 352 { }, 353}; 354 355static struct platform_driver bcm_pmb_driver = { 356 .driver = { 357 .name = "bcm-pmb", 358 .of_match_table = bcm_pmb_of_match, 359 }, 360 .probe = bcm_pmb_probe, 361}; 362 363builtin_platform_driver(bcm_pmb_driver); 364