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0007 #include <dt-bindings/soc/bcm-pmb.h>
0008 #include <linux/io.h>
0009 #include <linux/module.h>
0010 #include <linux/of.h>
0011 #include <linux/of_device.h>
0012 #include <linux/platform_device.h>
0013 #include <linux/pm_domain.h>
0014 #include <linux/reset/bcm63xx_pmb.h>
0015
0016 #define BPCM_ID_REG 0x00
0017 #define BPCM_CAPABILITIES 0x04
0018 #define BPCM_CAP_NUM_ZONES 0x000000ff
0019 #define BPCM_CAP_SR_REG_BITS 0x0000ff00
0020 #define BPCM_CAP_PLLTYPE 0x00030000
0021 #define BPCM_CAP_UBUS 0x00080000
0022 #define BPCM_CONTROL 0x08
0023 #define BPCM_STATUS 0x0c
0024 #define BPCM_ROSC_CONTROL 0x10
0025 #define BPCM_ROSC_THRESH_H 0x14
0026 #define BPCM_ROSC_THRESHOLD_BCM6838 0x14
0027 #define BPCM_ROSC_THRESH_S 0x18
0028 #define BPCM_ROSC_COUNT_BCM6838 0x18
0029 #define BPCM_ROSC_COUNT 0x1c
0030 #define BPCM_PWD_CONTROL_BCM6838 0x1c
0031 #define BPCM_PWD_CONTROL 0x20
0032 #define BPCM_SR_CONTROL_BCM6838 0x20
0033 #define BPCM_PWD_ACCUM_CONTROL 0x24
0034 #define BPCM_SR_CONTROL 0x28
0035 #define BPCM_GLOBAL_CONTROL 0x2c
0036 #define BPCM_MISC_CONTROL 0x30
0037 #define BPCM_MISC_CONTROL2 0x34
0038 #define BPCM_SGPHY_CNTL 0x38
0039 #define BPCM_SGPHY_STATUS 0x3c
0040 #define BPCM_ZONE0 0x40
0041 #define BPCM_ZONE_CONTROL 0x00
0042 #define BPCM_ZONE_CONTROL_MANUAL_CLK_EN 0x00000001
0043 #define BPCM_ZONE_CONTROL_MANUAL_RESET_CTL 0x00000002
0044 #define BPCM_ZONE_CONTROL_FREQ_SCALE_USED 0x00000004
0045 #define BPCM_ZONE_CONTROL_DPG_CAPABLE 0x00000008
0046 #define BPCM_ZONE_CONTROL_MANUAL_MEM_PWR 0x00000030
0047 #define BPCM_ZONE_CONTROL_MANUAL_ISO_CTL 0x00000040
0048 #define BPCM_ZONE_CONTROL_MANUAL_CTL 0x00000080
0049 #define BPCM_ZONE_CONTROL_DPG_CTL_EN 0x00000100
0050 #define BPCM_ZONE_CONTROL_PWR_DN_REQ 0x00000200
0051 #define BPCM_ZONE_CONTROL_PWR_UP_REQ 0x00000400
0052 #define BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN 0x00000800
0053 #define BPCM_ZONE_CONTROL_BLK_RESET_ASSERT 0x00001000
0054 #define BPCM_ZONE_CONTROL_MEM_STBY 0x00002000
0055 #define BPCM_ZONE_CONTROL_RESERVED 0x0007c000
0056 #define BPCM_ZONE_CONTROL_PWR_CNTL_STATE 0x00f80000
0057 #define BPCM_ZONE_CONTROL_FREQ_SCALAR_DYN_SEL 0x01000000
0058 #define BPCM_ZONE_CONTROL_PWR_OFF_STATE 0x02000000
0059 #define BPCM_ZONE_CONTROL_PWR_ON_STATE 0x04000000
0060 #define BPCM_ZONE_CONTROL_PWR_GOOD 0x08000000
0061 #define BPCM_ZONE_CONTROL_DPG_PWR_STATE 0x10000000
0062 #define BPCM_ZONE_CONTROL_MEM_PWR_STATE 0x20000000
0063 #define BPCM_ZONE_CONTROL_ISO_STATE 0x40000000
0064 #define BPCM_ZONE_CONTROL_RESET_STATE 0x80000000
0065 #define BPCM_ZONE_CONFIG1 0x04
0066 #define BPCM_ZONE_CONFIG2 0x08
0067 #define BPCM_ZONE_FREQ_SCALAR_CONTROL 0x0c
0068 #define BPCM_ZONE_SIZE 0x10
0069
0070 struct bcm_pmb {
0071 struct device *dev;
0072 void __iomem *base;
0073 spinlock_t lock;
0074 bool little_endian;
0075 struct genpd_onecell_data genpd_onecell_data;
0076 };
0077
0078 struct bcm_pmb_pd_data {
0079 const char * const name;
0080 int id;
0081 u8 bus;
0082 u8 device;
0083 };
0084
0085 struct bcm_pmb_pm_domain {
0086 struct bcm_pmb *pmb;
0087 const struct bcm_pmb_pd_data *data;
0088 struct generic_pm_domain genpd;
0089 };
0090
0091 static int bcm_pmb_bpcm_read(struct bcm_pmb *pmb, int bus, u8 device,
0092 int offset, u32 *val)
0093 {
0094 void __iomem *base = pmb->base + bus * 0x20;
0095 unsigned long flags;
0096 int err;
0097
0098 spin_lock_irqsave(&pmb->lock, flags);
0099 err = bpcm_rd(base, device, offset, val);
0100 spin_unlock_irqrestore(&pmb->lock, flags);
0101
0102 if (!err)
0103 *val = pmb->little_endian ? le32_to_cpu(*val) : be32_to_cpu(*val);
0104
0105 return err;
0106 }
0107
0108 static int bcm_pmb_bpcm_write(struct bcm_pmb *pmb, int bus, u8 device,
0109 int offset, u32 val)
0110 {
0111 void __iomem *base = pmb->base + bus * 0x20;
0112 unsigned long flags;
0113 int err;
0114
0115 val = pmb->little_endian ? cpu_to_le32(val) : cpu_to_be32(val);
0116
0117 spin_lock_irqsave(&pmb->lock, flags);
0118 err = bpcm_wr(base, device, offset, val);
0119 spin_unlock_irqrestore(&pmb->lock, flags);
0120
0121 return err;
0122 }
0123
0124 static int bcm_pmb_power_off_zone(struct bcm_pmb *pmb, int bus, u8 device,
0125 int zone)
0126 {
0127 int offset;
0128 u32 val;
0129 int err;
0130
0131 offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL;
0132
0133 err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
0134 if (err)
0135 return err;
0136
0137 val |= BPCM_ZONE_CONTROL_PWR_DN_REQ;
0138 val &= ~BPCM_ZONE_CONTROL_PWR_UP_REQ;
0139
0140 err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
0141
0142 return err;
0143 }
0144
0145 static int bcm_pmb_power_on_zone(struct bcm_pmb *pmb, int bus, u8 device,
0146 int zone)
0147 {
0148 int offset;
0149 u32 val;
0150 int err;
0151
0152 offset = BPCM_ZONE0 + zone * BPCM_ZONE_SIZE + BPCM_ZONE_CONTROL;
0153
0154 err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
0155 if (err)
0156 return err;
0157
0158 if (!(val & BPCM_ZONE_CONTROL_PWR_ON_STATE)) {
0159 val &= ~BPCM_ZONE_CONTROL_PWR_DN_REQ;
0160 val |= BPCM_ZONE_CONTROL_DPG_CTL_EN;
0161 val |= BPCM_ZONE_CONTROL_PWR_UP_REQ;
0162 val |= BPCM_ZONE_CONTROL_MEM_PWR_CTL_EN;
0163 val |= BPCM_ZONE_CONTROL_BLK_RESET_ASSERT;
0164
0165 err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
0166 }
0167
0168 return err;
0169 }
0170
0171 static int bcm_pmb_power_off_device(struct bcm_pmb *pmb, int bus, u8 device)
0172 {
0173 int offset;
0174 u32 val;
0175 int err;
0176
0177
0178 offset = BPCM_ZONE0 + BPCM_ZONE_CONTROL;
0179
0180 err = bcm_pmb_bpcm_read(pmb, bus, device, offset, &val);
0181 if (err)
0182 return err;
0183
0184 if (!(val & BPCM_ZONE_CONTROL_PWR_OFF_STATE)) {
0185 val = BPCM_ZONE_CONTROL_PWR_DN_REQ;
0186
0187 err = bcm_pmb_bpcm_write(pmb, bus, device, offset, val);
0188 }
0189
0190 return err;
0191 }
0192
0193 static int bcm_pmb_power_on_device(struct bcm_pmb *pmb, int bus, u8 device)
0194 {
0195 u32 val;
0196 int err;
0197 int i;
0198
0199 err = bcm_pmb_bpcm_read(pmb, bus, device, BPCM_CAPABILITIES, &val);
0200 if (err)
0201 return err;
0202
0203 for (i = 0; i < (val & BPCM_CAP_NUM_ZONES); i++) {
0204 err = bcm_pmb_power_on_zone(pmb, bus, device, i);
0205 if (err)
0206 return err;
0207 }
0208
0209 return err;
0210 }
0211
0212 static int bcm_pmb_power_on_sata(struct bcm_pmb *pmb, int bus, u8 device)
0213 {
0214 int err;
0215
0216 err = bcm_pmb_power_on_zone(pmb, bus, device, 0);
0217 if (err)
0218 return err;
0219
0220
0221 err = bcm_pmb_bpcm_write(pmb, bus, device, BPCM_MISC_CONTROL, 0);
0222 if (err)
0223 return err;
0224
0225 err = bcm_pmb_bpcm_write(pmb, bus, device, BPCM_SR_CONTROL, 0xffffffff);
0226 if (err)
0227 return err;
0228
0229 err = bcm_pmb_bpcm_write(pmb, bus, device, BPCM_SR_CONTROL, 0);
0230
0231 return err;
0232 }
0233
0234 static int bcm_pmb_power_on(struct generic_pm_domain *genpd)
0235 {
0236 struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd);
0237 const struct bcm_pmb_pd_data *data = pd->data;
0238 struct bcm_pmb *pmb = pd->pmb;
0239
0240 switch (data->id) {
0241 case BCM_PMB_PCIE0:
0242 case BCM_PMB_PCIE1:
0243 case BCM_PMB_PCIE2:
0244 return bcm_pmb_power_on_zone(pmb, data->bus, data->device, 0);
0245 case BCM_PMB_HOST_USB:
0246 return bcm_pmb_power_on_device(pmb, data->bus, data->device);
0247 case BCM_PMB_SATA:
0248 return bcm_pmb_power_on_sata(pmb, data->bus, data->device);
0249 default:
0250 dev_err(pmb->dev, "unsupported device id: %d\n", data->id);
0251 return -EINVAL;
0252 }
0253 }
0254
0255 static int bcm_pmb_power_off(struct generic_pm_domain *genpd)
0256 {
0257 struct bcm_pmb_pm_domain *pd = container_of(genpd, struct bcm_pmb_pm_domain, genpd);
0258 const struct bcm_pmb_pd_data *data = pd->data;
0259 struct bcm_pmb *pmb = pd->pmb;
0260
0261 switch (data->id) {
0262 case BCM_PMB_PCIE0:
0263 case BCM_PMB_PCIE1:
0264 case BCM_PMB_PCIE2:
0265 return bcm_pmb_power_off_zone(pmb, data->bus, data->device, 0);
0266 case BCM_PMB_HOST_USB:
0267 return bcm_pmb_power_off_device(pmb, data->bus, data->device);
0268 default:
0269 dev_err(pmb->dev, "unsupported device id: %d\n", data->id);
0270 return -EINVAL;
0271 }
0272 }
0273
0274 static int bcm_pmb_probe(struct platform_device *pdev)
0275 {
0276 struct device *dev = &pdev->dev;
0277 const struct bcm_pmb_pd_data *table;
0278 const struct bcm_pmb_pd_data *e;
0279 struct bcm_pmb *pmb;
0280 int max_id;
0281 int err;
0282
0283 pmb = devm_kzalloc(dev, sizeof(*pmb), GFP_KERNEL);
0284 if (!pmb)
0285 return -ENOMEM;
0286
0287 pmb->dev = dev;
0288
0289 pmb->base = devm_platform_ioremap_resource(pdev, 0);
0290 if (IS_ERR(pmb->base))
0291 return PTR_ERR(pmb->base);
0292
0293 spin_lock_init(&pmb->lock);
0294
0295 pmb->little_endian = !of_device_is_big_endian(dev->of_node);
0296
0297 table = of_device_get_match_data(dev);
0298 if (!table)
0299 return -EINVAL;
0300
0301 max_id = 0;
0302 for (e = table; e->name; e++)
0303 max_id = max(max_id, e->id);
0304
0305 pmb->genpd_onecell_data.num_domains = max_id + 1;
0306 pmb->genpd_onecell_data.domains =
0307 devm_kcalloc(dev, pmb->genpd_onecell_data.num_domains,
0308 sizeof(struct generic_pm_domain *), GFP_KERNEL);
0309 if (!pmb->genpd_onecell_data.domains)
0310 return -ENOMEM;
0311
0312 for (e = table; e->name; e++) {
0313 struct bcm_pmb_pm_domain *pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
0314
0315 if (!pd)
0316 return -ENOMEM;
0317
0318 pd->pmb = pmb;
0319 pd->data = e;
0320 pd->genpd.name = e->name;
0321 pd->genpd.power_on = bcm_pmb_power_on;
0322 pd->genpd.power_off = bcm_pmb_power_off;
0323
0324 pm_genpd_init(&pd->genpd, NULL, true);
0325 pmb->genpd_onecell_data.domains[e->id] = &pd->genpd;
0326 }
0327
0328 err = of_genpd_add_provider_onecell(dev->of_node, &pmb->genpd_onecell_data);
0329 if (err) {
0330 dev_err(dev, "failed to add genpd provider: %d\n", err);
0331 return err;
0332 }
0333
0334 return 0;
0335 }
0336
0337 static const struct bcm_pmb_pd_data bcm_pmb_bcm4908_data[] = {
0338 { .name = "pcie2", .id = BCM_PMB_PCIE2, .bus = 0, .device = 2, },
0339 { .name = "pcie0", .id = BCM_PMB_PCIE0, .bus = 1, .device = 14, },
0340 { .name = "pcie1", .id = BCM_PMB_PCIE1, .bus = 1, .device = 15, },
0341 { .name = "usb", .id = BCM_PMB_HOST_USB, .bus = 1, .device = 17, },
0342 { },
0343 };
0344
0345 static const struct bcm_pmb_pd_data bcm_pmb_bcm63138_data[] = {
0346 { .name = "sata", .id = BCM_PMB_SATA, .bus = 0, .device = 3, },
0347 { },
0348 };
0349
0350 static const struct of_device_id bcm_pmb_of_match[] = {
0351 { .compatible = "brcm,bcm4908-pmb", .data = &bcm_pmb_bcm4908_data, },
0352 { .compatible = "brcm,bcm63138-pmb", .data = &bcm_pmb_bcm63138_data, },
0353 { },
0354 };
0355
0356 static struct platform_driver bcm_pmb_driver = {
0357 .driver = {
0358 .name = "bcm-pmb",
0359 .of_match_table = bcm_pmb_of_match,
0360 },
0361 .probe = bcm_pmb_probe,
0362 };
0363
0364 builtin_platform_driver(bcm_pmb_driver);
