arch/x86/kernel/pmc_atom.c

   1 /*
   2  * Intel Atom SOC Power Management Controller Driver
   3  * Copyright (c) 2014, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  */
  15
  16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/pci.h>
  21 #include <linux/device.h>
  22 #include <linux/debugfs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/io.h>
  25
  26 #include <asm/pmc_atom.h>
  27
  28 #define DRIVER_NAME     KBUILD_MODNAME
  29
  30 struct pmc_dev {
  31         u32 base_addr;
  32         void __iomem *regmap;
  33 #ifdef CONFIG_DEBUG_FS
  34         struct dentry *dbgfs_dir;
  35 #endif /* CONFIG_DEBUG_FS */
  36 };
  37
  38 static struct pmc_dev pmc_device;
  39 static u32 acpi_base_addr;
  40
  41 struct pmc_dev_map {
  42         const char *name;
  43         u32 bit_mask;
  44 };
  45
  46 static const struct pmc_dev_map dev_map[] = {
  47         {"0  - LPSS1_F0_DMA",           BIT_LPSS1_F0_DMA},
  48         {"1  - LPSS1_F1_PWM1",          BIT_LPSS1_F1_PWM1},
  49         {"2  - LPSS1_F2_PWM2",          BIT_LPSS1_F2_PWM2},
  50         {"3  - LPSS1_F3_HSUART1",       BIT_LPSS1_F3_HSUART1},
  51         {"4  - LPSS1_F4_HSUART2",       BIT_LPSS1_F4_HSUART2},
  52         {"5  - LPSS1_F5_SPI",           BIT_LPSS1_F5_SPI},
  53         {"6  - LPSS1_F6_Reserved",      BIT_LPSS1_F6_XXX},
  54         {"7  - LPSS1_F7_Reserved",      BIT_LPSS1_F7_XXX},
  55         {"8  - SCC_EMMC",               BIT_SCC_EMMC},
  56         {"9  - SCC_SDIO",               BIT_SCC_SDIO},
  57         {"10 - SCC_SDCARD",             BIT_SCC_SDCARD},
  58         {"11 - SCC_MIPI",               BIT_SCC_MIPI},
  59         {"12 - HDA",                    BIT_HDA},
  60         {"13 - LPE",                    BIT_LPE},
  61         {"14 - OTG",                    BIT_OTG},
  62         {"15 - USH",                    BIT_USH},
  63         {"16 - GBE",                    BIT_GBE},
  64         {"17 - SATA",                   BIT_SATA},
  65         {"18 - USB_EHCI",               BIT_USB_EHCI},
  66         {"19 - SEC",                    BIT_SEC},
  67         {"20 - PCIE_PORT0",             BIT_PCIE_PORT0},
  68         {"21 - PCIE_PORT1",             BIT_PCIE_PORT1},
  69         {"22 - PCIE_PORT2",             BIT_PCIE_PORT2},
  70         {"23 - PCIE_PORT3",             BIT_PCIE_PORT3},
  71         {"24 - LPSS2_F0_DMA",           BIT_LPSS2_F0_DMA},
  72         {"25 - LPSS2_F1_I2C1",          BIT_LPSS2_F1_I2C1},
  73         {"26 - LPSS2_F2_I2C2",          BIT_LPSS2_F2_I2C2},
  74         {"27 - LPSS2_F3_I2C3",          BIT_LPSS2_F3_I2C3},
  75         {"28 - LPSS2_F3_I2C4",          BIT_LPSS2_F4_I2C4},
  76         {"29 - LPSS2_F5_I2C5",          BIT_LPSS2_F5_I2C5},
  77         {"30 - LPSS2_F6_I2C6",          BIT_LPSS2_F6_I2C6},
  78         {"31 - LPSS2_F7_I2C7",          BIT_LPSS2_F7_I2C7},
  79         {"32 - SMB",                    BIT_SMB},
  80         {"33 - OTG_SS_PHY",             BIT_OTG_SS_PHY},
  81         {"34 - USH_SS_PHY",             BIT_USH_SS_PHY},
  82         {"35 - DFX",                    BIT_DFX},
  83 };
  84
  85 static inline u32 pmc_reg_read(struct pmc_dev *pmc, int reg_offset)
  86 {
  87         return readl(pmc->regmap + reg_offset);
  88 }
  89
  90 static inline void pmc_reg_write(struct pmc_dev *pmc, int reg_offset, u32 val)
  91 {
  92         writel(val, pmc->regmap + reg_offset);
  93 }
  94
  95 static void pmc_power_off(void)
  96 {
  97         u16     pm1_cnt_port;
  98         u32     pm1_cnt_value;
  99
 100         pr_info("Preparing to enter system sleep state S5\n");
 101
 102         pm1_cnt_port = acpi_base_addr + PM1_CNT;
 103
 104         pm1_cnt_value = inl(pm1_cnt_port);
 105         pm1_cnt_value &= SLEEP_TYPE_MASK;
 106         pm1_cnt_value |= SLEEP_TYPE_S5;
 107         pm1_cnt_value |= SLEEP_ENABLE;
 108
 109         outl(pm1_cnt_value, pm1_cnt_port);
 110 }
 111
 112 static void pmc_hw_reg_setup(struct pmc_dev *pmc)
 113 {
 114         /*
 115          * Disable PMC S0IX_WAKE_EN events coming from:
 116          * - LPC clock run
 117          * - GPIO_SUS ored dedicated IRQs
 118          * - GPIO_SCORE ored dedicated IRQs
 119          * - GPIO_SUS shared IRQ
 120          * - GPIO_SCORE shared IRQ
 121          */
 122         pmc_reg_write(pmc, PMC_S0IX_WAKE_EN, (u32)PMC_WAKE_EN_SETTING);
 123 }
 124
 125 #ifdef CONFIG_DEBUG_FS
 126 static int pmc_dev_state_show(struct seq_file *s, void *unused)
 127 {
 128         struct pmc_dev *pmc = s->private;
 129         u32 func_dis, func_dis_2, func_dis_index;
 130         u32 d3_sts_0, d3_sts_1, d3_sts_index;
 131         int dev_num, dev_index, reg_index;
 132
 133         func_dis = pmc_reg_read(pmc, PMC_FUNC_DIS);
 134         func_dis_2 = pmc_reg_read(pmc, PMC_FUNC_DIS_2);
 135         d3_sts_0 = pmc_reg_read(pmc, PMC_D3_STS_0);
 136         d3_sts_1 = pmc_reg_read(pmc, PMC_D3_STS_1);
 137
 138         dev_num = ARRAY_SIZE(dev_map);
 139
 140         for (dev_index = 0; dev_index < dev_num; dev_index++) {
 141                 reg_index = dev_index / PMC_REG_BIT_WIDTH;
 142                 if (reg_index) {
 143                         func_dis_index = func_dis_2;
 144                         d3_sts_index = d3_sts_1;
 145                 } else {
 146                         func_dis_index = func_dis;
 147                         d3_sts_index = d3_sts_0;
 148                 }
 149
 150                 seq_printf(s, "Dev: %-32s\tState: %s [%s]\n",
 151                         dev_map[dev_index].name,
 152                         dev_map[dev_index].bit_mask & func_dis_index ?
 153                         "Disabled" : "Enabled ",
 154                         dev_map[dev_index].bit_mask & d3_sts_index ?
 155                         "D3" : "D0");
 156         }
 157         return 0;
 158 }
 159
 160 static int pmc_dev_state_open(struct inode *inode, struct file *file)
 161 {
 162         return single_open(file, pmc_dev_state_show, inode->i_private);
 163 }
 164
 165 static const struct file_operations pmc_dev_state_ops = {
 166         .open           = pmc_dev_state_open,
 167         .read           = seq_read,
 168         .llseek         = seq_lseek,
 169         .release        = single_release,
 170 };
 171
 172 static int pmc_sleep_tmr_show(struct seq_file *s, void *unused)
 173 {
 174         struct pmc_dev *pmc = s->private;
 175         u64 s0ir_tmr, s0i1_tmr, s0i2_tmr, s0i3_tmr, s0_tmr;
 176
 177         s0ir_tmr = (u64)pmc_reg_read(pmc, PMC_S0IR_TMR) << PMC_TMR_SHIFT;
 178         s0i1_tmr = (u64)pmc_reg_read(pmc, PMC_S0I1_TMR) << PMC_TMR_SHIFT;
 179         s0i2_tmr = (u64)pmc_reg_read(pmc, PMC_S0I2_TMR) << PMC_TMR_SHIFT;
 180         s0i3_tmr = (u64)pmc_reg_read(pmc, PMC_S0I3_TMR) << PMC_TMR_SHIFT;
 181         s0_tmr = (u64)pmc_reg_read(pmc, PMC_S0_TMR) << PMC_TMR_SHIFT;
 182
 183         seq_printf(s, "S0IR Residency:\t%lldus\n", s0ir_tmr);
 184         seq_printf(s, "S0I1 Residency:\t%lldus\n", s0i1_tmr);
 185         seq_printf(s, "S0I2 Residency:\t%lldus\n", s0i2_tmr);
 186         seq_printf(s, "S0I3 Residency:\t%lldus\n", s0i3_tmr);
 187         seq_printf(s, "S0   Residency:\t%lldus\n", s0_tmr);
 188         return 0;
 189 }
 190
 191 static int pmc_sleep_tmr_open(struct inode *inode, struct file *file)
 192 {
 193         return single_open(file, pmc_sleep_tmr_show, inode->i_private);
 194 }
 195
 196 static const struct file_operations pmc_sleep_tmr_ops = {
 197         .open           = pmc_sleep_tmr_open,
 198         .read           = seq_read,
 199         .llseek         = seq_lseek,
 200         .release        = single_release,
 201 };
 202
 203 static void pmc_dbgfs_unregister(struct pmc_dev *pmc)
 204 {
 205         if (!pmc->dbgfs_dir)
 206                 return;
 207
 208         debugfs_remove_recursive(pmc->dbgfs_dir);
 209         pmc->dbgfs_dir = NULL;
 210 }
 211
 212 static int pmc_dbgfs_register(struct pmc_dev *pmc, struct pci_dev *pdev)
 213 {
 214         struct dentry *dir, *f;
 215
 216         dir = debugfs_create_dir("pmc_atom", NULL);
 217         if (!dir)
 218                 return -ENOMEM;
 219
 220         f = debugfs_create_file("dev_state", S_IFREG | S_IRUGO,
 221                                 dir, pmc, &pmc_dev_state_ops);
 222         if (!f) {
 223                 dev_err(&pdev->dev, "dev_states register failed\n");
 224                 goto err;
 225         }
 226         f = debugfs_create_file("sleep_state", S_IFREG | S_IRUGO,
 227                                 dir, pmc, &pmc_sleep_tmr_ops);
 228         if (!f) {
 229                 dev_err(&pdev->dev, "sleep_state register failed\n");
 230                 goto err;
 231         }
 232         pmc->dbgfs_dir = dir;
 233         return 0;
 234 err:
 235         pmc_dbgfs_unregister(pmc);
 236         return -ENODEV;
 237 }
 238 #else
 239 static int pmc_dbgfs_register(struct pmc_dev *pmc, struct pci_dev *pdev)
 240 {
 241         return 0;
 242 }
 243 #endif /* CONFIG_DEBUG_FS */
 244
 245 static int pmc_setup_dev(struct pci_dev *pdev)
 246 {
 247         struct pmc_dev *pmc = &pmc_device;
 248         int ret;
 249
 250         /* Obtain ACPI base address */
 251         pci_read_config_dword(pdev, ACPI_BASE_ADDR_OFFSET, &acpi_base_addr);
 252         acpi_base_addr &= ACPI_BASE_ADDR_MASK;
 253
 254         /* Install power off function */
 255         if (acpi_base_addr != 0 && pm_power_off == NULL)
 256                 pm_power_off = pmc_power_off;
 257
 258         pci_read_config_dword(pdev, PMC_BASE_ADDR_OFFSET, &pmc->base_addr);
 259         pmc->base_addr &= PMC_BASE_ADDR_MASK;
 260
 261         pmc->regmap = ioremap_nocache(pmc->base_addr, PMC_MMIO_REG_LEN);
 262         if (!pmc->regmap) {
 263                 dev_err(&pdev->dev, "error: ioremap failed\n");
 264                 return -ENOMEM;
 265         }
 266
 267         /* PMC hardware registers setup */
 268         pmc_hw_reg_setup(pmc);
 269
 270         ret = pmc_dbgfs_register(pmc, pdev);
 271         if (ret) {
 272                 iounmap(pmc->regmap);
 273         }
 274
 275         return ret;
 276 }
 277
 278 /*
 279  * Data for PCI driver interface
 280  *
 281  * This data only exists for exporting the supported
 282  * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
 283  * register a pci_driver, because lpc_ich will register
 284  * a driver on the same PCI id.
 285  */
 286 static const struct pci_device_id pmc_pci_ids[] = {
 287         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_VLV_PMC) },
 288         { 0, },
 289 };
 290
 291 MODULE_DEVICE_TABLE(pci, pmc_pci_ids);
 292
 293 static int __init pmc_atom_init(void)
 294 {
 295         int err = -ENODEV;
 296         struct pci_dev *pdev = NULL;
 297         const struct pci_device_id *ent;
 298
 299         /* We look for our device - PCU PMC
 300          * we assume that there is max. one device.
 301          *
 302          * We can't use plain pci_driver mechanism,
 303          * as the device is really a multiple function device,
 304          * main driver that binds to the pci_device is lpc_ich
 305          * and have to find & bind to the device this way.
 306          */
 307         for_each_pci_dev(pdev) {
 308                 ent = pci_match_id(pmc_pci_ids, pdev);
 309                 if (ent) {
 310                         err = pmc_setup_dev(pdev);
 311                         goto out;
 312                 }
 313         }
 314         /* Device not found. */
 315 out:
 316         return err;
 317 }
 318
 319 module_init(pmc_atom_init);
 320 /* no module_exit, this driver shouldn't be unloaded */
 321
 322 MODULE_AUTHOR("Aubrey Li <aubrey.li@linux.intel.com>");
 323 MODULE_DESCRIPTION("Intel Atom SOC Power Management Controller Interface");
 324 MODULE_LICENSE("GPL v2");