This simple PMU driver enables access to MMC controllers during probe so tangier_sdhci can probe and be useful.
In the future it might be expanded to cover other Intel MID platforms, that's why it's called intel_mid_pmu.c.
Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com --- arch/x86/Kconfig | 2 + drivers/misc/Kconfig | 6 +++ drivers/misc/Makefile | 1 + drivers/misc/intel_mid_pmu.c | 124 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 133 insertions(+) create mode 100644 drivers/misc/intel_mid_pmu.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 6a747c332e..04310653bb 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -83,7 +83,9 @@ endchoice # subarchitectures-specific options below config INTEL_MID bool "Intel MID platform support" + select MISC select INTEL_SCU + select INTEL_MID_PMU help Select to build a U-Boot capable of supporting Intel MID (Mobile Internet Device) platform systems which do not have diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 8d81f9c51c..0222a8beed 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -168,6 +168,12 @@ config I2C_EEPROM help Enable a generic driver for EEPROMs attached via I2C.
+config INTEL_MID_PMU + bool "Support for PMU on Intel MID platforms" + depends on MISC + depends on INTEL_MID + default y + config INTEL_SCU bool "Enable support for SCU on Intel MID platforms" depends on INTEL_MID diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 47551e44d6..98a58f241c 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -51,4 +51,5 @@ obj-$(CONFIG_PCA9551_LED) += pca9551_led.o obj-$(CONFIG_FSL_DEVICE_DISABLE) += fsl_devdis.o obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o obj-$(CONFIG_QFW) += qfw.o +obj-$(CONFIG_INTEL_MID_PMU) += intel_mid_pmu.o obj-$(CONFIG_INTEL_SCU) += intel_scu_ipc.o diff --git a/drivers/misc/intel_mid_pmu.c b/drivers/misc/intel_mid_pmu.c new file mode 100644 index 0000000000..0eda3b4349 --- /dev/null +++ b/drivers/misc/intel_mid_pmu.c @@ -0,0 +1,124 @@ +/* + * Copyright (c) 2017 Intel Corporation + * + * SPDX-License-Identifier: GPL-2.0+ + */ +#include <common.h> +#include <dm.h> +#include <dm/device-internal.h> +#include <dm/device.h> +#include <linux/io.h> +#include <linux/sizes.h> +#include <malloc.h> + +/* Registers */ +#define PM_STS 0x00 +#define PM_CMD 0x04 +#define PM_ICS 0x08 +#define PM_WKC(x) (0x10 + (x) * 4) +#define PM_WKS(x) (0x18 + (x) * 4) +#define PM_SSC(x) (0x20 + (x) * 4) +#define PM_SSS(x) (0x30 + (x) * 4) + +/* Bits in PM_STS */ +#define PM_STS_BUSY (1 << 8) + +/* List of Intel Tangier LSSs */ +#define PMU_LSS_TANGIER_SDIO0_01 1 + +struct pmu_mid { + void __iomem *ioaddr; +}; + +static unsigned int pmu_readl(void __iomem *base, unsigned int offset) +{ + return readl(base + offset); +} + +static void pmu_writel(void __iomem *base, unsigned int offset, + unsigned int value) +{ + writel(value, base + offset); +} + +static int pmu_read_status(struct pmu_mid *pmu) +{ + int retry = 500000; + u32 reg; + + do { + reg = pmu_readl(pmu->ioaddr, PM_STS); + if (!(reg & PM_STS_BUSY)) + return 0; + + udelay(1); + } while (--retry); + + printf("WARNING: PMU still busy\n"); + return -EBUSY; +} + +static int pmu_enable_mmc(struct pmu_mid *pmu) +{ + u32 pm_ssc0; + int ret; + + /* Check PMU status */ + ret = pmu_read_status(pmu); + if (ret) + return ret; + + /* Read PMU values */ + pm_ssc0 = pmu_readl(pmu->ioaddr, PM_SSS(0)); + + /* Modify PMU values */ + + /* Enable SDIO0, sdhci for SD card */ + pm_ssc0 &= ~(0x3 << (PMU_LSS_TANGIER_SDIO0_01 * 2)); + + /* Write modified PMU values */ + pmu_writel(pmu->ioaddr, PM_SSC(0), pm_ssc0); + + /* Update modified PMU values */ + pmu_writel(pmu->ioaddr, PM_CMD, 0x00002201); + + /* Check PMU status */ + return pmu_read_status(pmu); +} + +static int pmu_mid_bind(struct udevice *dev) +{ + /* This device is needed straight away */ + return device_probe(dev); +} + +static int pmu_mid_probe(struct udevice *dev) +{ + struct pmu_mid *pmu = dev_get_uclass_priv(dev); + fdt_addr_t base; + + base = dev_get_addr(dev); + if (base == FDT_ADDR_T_NONE) + return -EINVAL; + + pmu->ioaddr = devm_ioremap(dev, base, SZ_1K); + if (!pmu->ioaddr) + return -ENOMEM; + + return pmu_enable_mmc(pmu); +} + +static const struct udevice_id pmu_mid_match[] = { + { .compatible = "intel,pmu-mid" }, + { .compatible = "intel,pmu-tangier" }, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(intel_mid_pmu) = { + .name = "intel_mid_pmu", + .id = UCLASS_MISC, + .of_match = pmu_mid_match, + .bind = pmu_mid_bind, + .probe = pmu_mid_probe, + .priv_auto_alloc_size = sizeof(struct pmu_mid), +};