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.ba...@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevche...@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),
+};
--
2.11.0
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