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-rw-r--r--arch/x86/kernel/pmc_atom.c321
1 files changed, 321 insertions, 0 deletions
diff --git a/arch/x86/kernel/pmc_atom.c b/arch/x86/kernel/pmc_atom.c
new file mode 100644
index 000000000000..0c424a67985d
--- /dev/null
+++ b/arch/x86/kernel/pmc_atom.c
@@ -0,0 +1,321 @@
+/*
+ * Intel Atom SOC Power Management Controller Driver
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/io.h>
+
+#include <asm/pmc_atom.h>
+
+#define DRIVER_NAME KBUILD_MODNAME
+
+struct pmc_dev {
+ u32 base_addr;
+ void __iomem *regmap;
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *dbgfs_dir;
+#endif /* CONFIG_DEBUG_FS */
+};
+
+static struct pmc_dev pmc_device;
+static u32 acpi_base_addr;
+
+struct pmc_dev_map {
+ const char *name;
+ u32 bit_mask;
+};
+
+static const struct pmc_dev_map dev_map[] = {
+ {"0 - LPSS1_F0_DMA", BIT_LPSS1_F0_DMA},
+ {"1 - LPSS1_F1_PWM1", BIT_LPSS1_F1_PWM1},
+ {"2 - LPSS1_F2_PWM2", BIT_LPSS1_F2_PWM2},
+ {"3 - LPSS1_F3_HSUART1", BIT_LPSS1_F3_HSUART1},
+ {"4 - LPSS1_F4_HSUART2", BIT_LPSS1_F4_HSUART2},
+ {"5 - LPSS1_F5_SPI", BIT_LPSS1_F5_SPI},
+ {"6 - LPSS1_F6_Reserved", BIT_LPSS1_F6_XXX},
+ {"7 - LPSS1_F7_Reserved", BIT_LPSS1_F7_XXX},
+ {"8 - SCC_EMMC", BIT_SCC_EMMC},
+ {"9 - SCC_SDIO", BIT_SCC_SDIO},
+ {"10 - SCC_SDCARD", BIT_SCC_SDCARD},
+ {"11 - SCC_MIPI", BIT_SCC_MIPI},
+ {"12 - HDA", BIT_HDA},
+ {"13 - LPE", BIT_LPE},
+ {"14 - OTG", BIT_OTG},
+ {"15 - USH", BIT_USH},
+ {"16 - GBE", BIT_GBE},
+ {"17 - SATA", BIT_SATA},
+ {"18 - USB_EHCI", BIT_USB_EHCI},
+ {"19 - SEC", BIT_SEC},
+ {"20 - PCIE_PORT0", BIT_PCIE_PORT0},
+ {"21 - PCIE_PORT1", BIT_PCIE_PORT1},
+ {"22 - PCIE_PORT2", BIT_PCIE_PORT2},
+ {"23 - PCIE_PORT3", BIT_PCIE_PORT3},
+ {"24 - LPSS2_F0_DMA", BIT_LPSS2_F0_DMA},
+ {"25 - LPSS2_F1_I2C1", BIT_LPSS2_F1_I2C1},
+ {"26 - LPSS2_F2_I2C2", BIT_LPSS2_F2_I2C2},
+ {"27 - LPSS2_F3_I2C3", BIT_LPSS2_F3_I2C3},
+ {"28 - LPSS2_F3_I2C4", BIT_LPSS2_F4_I2C4},
+ {"29 - LPSS2_F5_I2C5", BIT_LPSS2_F5_I2C5},
+ {"30 - LPSS2_F6_I2C6", BIT_LPSS2_F6_I2C6},
+ {"31 - LPSS2_F7_I2C7", BIT_LPSS2_F7_I2C7},
+ {"32 - SMB", BIT_SMB},
+ {"33 - OTG_SS_PHY", BIT_OTG_SS_PHY},
+ {"34 - USH_SS_PHY", BIT_USH_SS_PHY},
+ {"35 - DFX", BIT_DFX},
+};
+
+static inline u32 pmc_reg_read(struct pmc_dev *pmc, int reg_offset)
+{
+ return readl(pmc->regmap + reg_offset);
+}
+
+static inline void pmc_reg_write(struct pmc_dev *pmc, int reg_offset, u32 val)
+{
+ writel(val, pmc->regmap + reg_offset);
+}
+
+static void pmc_power_off(void)
+{
+ u16 pm1_cnt_port;
+ u32 pm1_cnt_value;
+
+ pr_info("Preparing to enter system sleep state S5\n");
+
+ pm1_cnt_port = acpi_base_addr + PM1_CNT;
+
+ pm1_cnt_value = inl(pm1_cnt_port);
+ pm1_cnt_value &= SLEEP_TYPE_MASK;
+ pm1_cnt_value |= SLEEP_TYPE_S5;
+ pm1_cnt_value |= SLEEP_ENABLE;
+
+ outl(pm1_cnt_value, pm1_cnt_port);
+}
+
+static void pmc_hw_reg_setup(struct pmc_dev *pmc)
+{
+ /*
+ * Disable PMC S0IX_WAKE_EN events coming from:
+ * - LPC clock run
+ * - GPIO_SUS ored dedicated IRQs
+ * - GPIO_SCORE ored dedicated IRQs
+ * - GPIO_SUS shared IRQ
+ * - GPIO_SCORE shared IRQ
+ */
+ pmc_reg_write(pmc, PMC_S0IX_WAKE_EN, (u32)PMC_WAKE_EN_SETTING);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int pmc_dev_state_show(struct seq_file *s, void *unused)
+{
+ struct pmc_dev *pmc = s->private;
+ u32 func_dis, func_dis_2, func_dis_index;
+ u32 d3_sts_0, d3_sts_1, d3_sts_index;
+ int dev_num, dev_index, reg_index;
+
+ func_dis = pmc_reg_read(pmc, PMC_FUNC_DIS);
+ func_dis_2 = pmc_reg_read(pmc, PMC_FUNC_DIS_2);
+ d3_sts_0 = pmc_reg_read(pmc, PMC_D3_STS_0);
+ d3_sts_1 = pmc_reg_read(pmc, PMC_D3_STS_1);
+
+ dev_num = ARRAY_SIZE(dev_map);
+
+ for (dev_index = 0; dev_index < dev_num; dev_index++) {
+ reg_index = dev_index / PMC_REG_BIT_WIDTH;
+ if (reg_index) {
+ func_dis_index = func_dis_2;
+ d3_sts_index = d3_sts_1;
+ } else {
+ func_dis_index = func_dis;
+ d3_sts_index = d3_sts_0;
+ }
+
+ seq_printf(s, "Dev: %-32s\tState: %s [%s]\n",
+ dev_map[dev_index].name,
+ dev_map[dev_index].bit_mask & func_dis_index ?
+ "Disabled" : "Enabled ",
+ dev_map[dev_index].bit_mask & d3_sts_index ?
+ "D3" : "D0");
+ }
+ return 0;
+}
+
+static int pmc_dev_state_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, pmc_dev_state_show, inode->i_private);
+}
+
+static const struct file_operations pmc_dev_state_ops = {
+ .open = pmc_dev_state_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int pmc_sleep_tmr_show(struct seq_file *s, void *unused)
+{
+ struct pmc_dev *pmc = s->private;
+ u64 s0ir_tmr, s0i1_tmr, s0i2_tmr, s0i3_tmr, s0_tmr;
+
+ s0ir_tmr = (u64)pmc_reg_read(pmc, PMC_S0IR_TMR) << PMC_TMR_SHIFT;
+ s0i1_tmr = (u64)pmc_reg_read(pmc, PMC_S0I1_TMR) << PMC_TMR_SHIFT;
+ s0i2_tmr = (u64)pmc_reg_read(pmc, PMC_S0I2_TMR) << PMC_TMR_SHIFT;
+ s0i3_tmr = (u64)pmc_reg_read(pmc, PMC_S0I3_TMR) << PMC_TMR_SHIFT;
+ s0_tmr = (u64)pmc_reg_read(pmc, PMC_S0_TMR) << PMC_TMR_SHIFT;
+
+ seq_printf(s, "S0IR Residency:\t%lldus\n", s0ir_tmr);
+ seq_printf(s, "S0I1 Residency:\t%lldus\n", s0i1_tmr);
+ seq_printf(s, "S0I2 Residency:\t%lldus\n", s0i2_tmr);
+ seq_printf(s, "S0I3 Residency:\t%lldus\n", s0i3_tmr);
+ seq_printf(s, "S0 Residency:\t%lldus\n", s0_tmr);
+ return 0;
+}
+
+static int pmc_sleep_tmr_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, pmc_sleep_tmr_show, inode->i_private);
+}
+
+static const struct file_operations pmc_sleep_tmr_ops = {
+ .open = pmc_sleep_tmr_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void pmc_dbgfs_unregister(struct pmc_dev *pmc)
+{
+ if (!pmc->dbgfs_dir)
+ return;
+
+ debugfs_remove_recursive(pmc->dbgfs_dir);
+ pmc->dbgfs_dir = NULL;
+}
+
+static int pmc_dbgfs_register(struct pmc_dev *pmc, struct pci_dev *pdev)
+{
+ struct dentry *dir, *f;
+
+ dir = debugfs_create_dir("pmc_atom", NULL);
+ if (!dir)
+ return -ENOMEM;
+
+ f = debugfs_create_file("dev_state", S_IFREG | S_IRUGO,
+ dir, pmc, &pmc_dev_state_ops);
+ if (!f) {
+ dev_err(&pdev->dev, "dev_states register failed\n");
+ goto err;
+ }
+ f = debugfs_create_file("sleep_state", S_IFREG | S_IRUGO,
+ dir, pmc, &pmc_sleep_tmr_ops);
+ if (!f) {
+ dev_err(&pdev->dev, "sleep_state register failed\n");
+ goto err;
+ }
+ pmc->dbgfs_dir = dir;
+ return 0;
+err:
+ pmc_dbgfs_unregister(pmc);
+ return -ENODEV;
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static int pmc_setup_dev(struct pci_dev *pdev)
+{
+ struct pmc_dev *pmc = &pmc_device;
+ int ret;
+
+ /* Obtain ACPI base address */
+ pci_read_config_dword(pdev, ACPI_BASE_ADDR_OFFSET, &acpi_base_addr);
+ acpi_base_addr &= ACPI_BASE_ADDR_MASK;
+
+ /* Install power off function */
+ if (acpi_base_addr != 0 && pm_power_off == NULL)
+ pm_power_off = pmc_power_off;
+
+ pci_read_config_dword(pdev, PMC_BASE_ADDR_OFFSET, &pmc->base_addr);
+ pmc->base_addr &= PMC_BASE_ADDR_MASK;
+
+ pmc->regmap = ioremap_nocache(pmc->base_addr, PMC_MMIO_REG_LEN);
+ if (!pmc->regmap) {
+ dev_err(&pdev->dev, "error: ioremap failed\n");
+ return -ENOMEM;
+ }
+
+ /* PMC hardware registers setup */
+ pmc_hw_reg_setup(pmc);
+
+#ifdef CONFIG_DEBUG_FS
+ ret = pmc_dbgfs_register(pmc, pdev);
+ if (ret) {
+ iounmap(pmc->regmap);
+ return ret;
+ }
+#endif /* CONFIG_DEBUG_FS */
+ return 0;
+}
+
+/*
+ * Data for PCI driver interface
+ *
+ * This data only exists for exporting the supported
+ * PCI ids via MODULE_DEVICE_TABLE. We do not actually
+ * register a pci_driver, because lpc_ich will register
+ * a driver on the same PCI id.
+ */
+static const struct pci_device_id pmc_pci_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_VLV_PMC) },
+ { 0, },
+};
+
+MODULE_DEVICE_TABLE(pci, pmc_pci_ids);
+
+static int __init pmc_atom_init(void)
+{
+ int err = -ENODEV;
+ struct pci_dev *pdev = NULL;
+ const struct pci_device_id *ent;
+
+ /* We look for our device - PCU PMC
+ * we assume that there is max. one device.
+ *
+ * We can't use plain pci_driver mechanism,
+ * as the device is really a multiple function device,
+ * main driver that binds to the pci_device is lpc_ich
+ * and have to find & bind to the device this way.
+ */
+ for_each_pci_dev(pdev) {
+ ent = pci_match_id(pmc_pci_ids, pdev);
+ if (ent) {
+ err = pmc_setup_dev(pdev);
+ goto out;
+ }
+ }
+ /* Device not found. */
+out:
+ return err;
+}
+
+module_init(pmc_atom_init);
+/* no module_exit, this driver shouldn't be unloaded */
+
+MODULE_AUTHOR("Aubrey Li <aubrey.li@linux.intel.com>");
+MODULE_DESCRIPTION("Intel Atom SOC Power Management Controller Interface");
+MODULE_LICENSE("GPL v2");
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