From: Nitin Garg nitin.garg@freescale.com

Add api to check and enable pll3 as required for thermal sensor driver.

Signed-off-by: Ye.Li B37916@freescale.com Signed-off-by: Nitin Garg nitin.garg@freescale.com --- arch/arm/cpu/armv7/mx6/clock.c | 30 ++++++++++++++++++++++++++++++ arch/arm/include/asm/arch-mx6/clock.h | 1 + 2 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c index 6c9c78c..144080e 100644 --- a/arch/arm/cpu/armv7/mx6/clock.c +++ b/arch/arm/cpu/armv7/mx6/clock.c @@ -673,6 +673,36 @@ void hab_caam_clock_enable(unsigned char enable) } #endif

+static void enable_pll3(void) +{ + struct anatop_regs __iomem *anatop = + (struct anatop_regs __iomem *)ANATOP_BASE_ADDR; + + /* make sure pll3 is enabled */ + if ((readl(&anatop->usb1_pll_480_ctrl) & + BM_ANADIG_USB1_PLL_480_CTRL_LOCK) == 0) { + /* enable pll's power */ + writel(BM_ANADIG_USB1_PLL_480_CTRL_POWER, + &anatop->usb1_pll_480_ctrl_set); + writel(0x80, &anatop->ana_misc2_clr); + /* wait for pll lock */ + while ((readl(&anatop->usb1_pll_480_ctrl) & + BM_ANADIG_USB1_PLL_480_CTRL_LOCK) == 0) + ; + /* disable bypass */ + writel(BM_ANADIG_USB1_PLL_480_CTRL_BYPASS, + &anatop->usb1_pll_480_ctrl_clr); + /* enable pll output */ + writel(BM_ANADIG_USB1_PLL_480_CTRL_ENABLE, + &anatop->usb1_pll_480_ctrl_set); + } +} + +void enable_thermal_clk() +{ + enable_pll3(); +} + unsigned int mxc_get_clock(enum mxc_clock clk) { switch (clk) { diff --git a/arch/arm/include/asm/arch-mx6/clock.h b/arch/arm/include/asm/arch-mx6/clock.h index 3c58a0a..8e51f9b 100644 --- a/arch/arm/include/asm/arch-mx6/clock.h +++ b/arch/arm/include/asm/arch-mx6/clock.h @@ -66,4 +66,5 @@ int enable_spi_clk(unsigned char enable, unsigned spi_num); void enable_ipu_clock(void); int enable_fec_anatop_clock(enum enet_freq freq); void enable_enet_clk(unsigned char enable); +void enable_thermal_clk(void); #endif /* __ASM_ARCH_CLOCK_H */

Add a new thermal uclass for thermal sensor and implement the imx thermal driver basing on this uclass.

Signed-off-by: Ye.Li B37916@freescale.com --- drivers/Makefile | 1 + drivers/thermal/Makefile | 9 ++ drivers/thermal/imx_thermal.c | 177 ++++++++++++++++++++++++++++++++++++++ drivers/thermal/thermal-uclass.c | 30 +++++++ include/dm/uclass-id.h | 1 + include/imx_thermal.h | 17 ++++ include/thermal.h | 42 +++++++++ 7 files changed, 277 insertions(+), 0 deletions(-)

diff --git a/drivers/Makefile b/drivers/Makefile index 33227c8..7683c61 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -21,3 +21,4 @@ obj-y += pwm/ obj-y += input/ # SOC specific infrastructure drivers. obj-y += soc/ +obj-y += thermal/ diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile new file mode 100644 index 0000000..6d4cacd --- /dev/null +++ b/drivers/thermal/Makefile @@ -0,0 +1,9 @@ +# +# (C) Copyright 2014 Freescale Semiconductor, Inc. +# Author: Nitin Garg nitin.garg@freescale.com +# +# SPDX-License-Identifier: GPL-2.0+ +# + +obj-$(CONFIG_DM_THERMAL) += thermal-uclass.o +obj-$(CONFIG_IMX6_THERMAL) += imx_thermal.o diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c new file mode 100644 index 0000000..1161585 --- /dev/null +++ b/drivers/thermal/imx_thermal.c @@ -0,0 +1,177 @@ +/* + * (C) Copyright 2014 Freescale Semiconductor, Inc. + * Author: Nitin Garg nitin.garg@freescale.com + * Ye Li Ye.Li@freescale.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <config.h> +#include <common.h> +#include <div64.h> +#include <fuse.h> +#include <asm/io.h> +#include <asm/arch/clock.h> +#include <dm.h> +#include <errno.h> +#include <malloc.h> +#include <thermal.h> +#include <imx_thermal.h> + +#define TEMPERATURE_MIN -40 +#define TEMPERATURE_HOT 80 +#define TEMPERATURE_MAX 125 +#define FACTOR0 10000000 +#define FACTOR1 15976 +#define FACTOR2 4297157 +#define MEASURE_FREQ 327 + +#define TEMPSENSE0_TEMP_CNT_SHIFT 8 +#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) +#define TEMPSENSE0_FINISHED (1 << 2) +#define TEMPSENSE0_MEASURE_TEMP (1 << 1) +#define TEMPSENSE0_POWER_DOWN (1 << 0) +#define MISC0_REFTOP_SELBIASOFF (1 << 3) +#define TEMPSENSE1_MEASURE_FREQ 0xffff + +static int read_cpu_temperature(struct udevice *dev) +{ + int temperature; + unsigned int reg, n_meas; + const struct imx_thermal_plat *pdata = dev_get_platdata(dev); + struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs; + unsigned int *priv = dev_get_priv(dev); + u32 fuse = *priv; + int t1, n1; + u32 c1, c2; + u64 temp64; + + /* + * Sensor data layout: + * [31:20] - sensor value @ 25C + * We use universal formula now and only need sensor value @ 25C + * slope = 0.4297157 - (0.0015976 * 25C fuse) + */ + n1 = fuse >> 20; + t1 = 25; /* t1 always 25C */ + + /* + * Derived from linear interpolation: + * slope = 0.4297157 - (0.0015976 * 25C fuse) + * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0 + * (Nmeas - n1) / (Tmeas - t1) = slope + * We want to reduce this down to the minimum computation necessary + * for each temperature read. Also, we want Tmeas in millicelsius + * and we don't want to lose precision from integer division. So... + * Tmeas = (Nmeas - n1) / slope + t1 + * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1 + * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1 + * Let constant c1 = (-1000 / slope) + * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1 + * Let constant c2 = n1 *c1 + 1000 * t1 + * milli_Tmeas = c2 - Nmeas * c1 + */ + temp64 = FACTOR0; + temp64 *= 1000; + do_div(temp64, FACTOR1 * n1 - FACTOR2); + c1 = temp64; + c2 = n1 * c1 + 1000 * t1; + + /* + * now we only use single measure, every time we read + * the temperature, we will power on/down anadig thermal + * module + */ + writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr); + writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set); + + /* setup measure freq */ + reg = readl(&anatop->tempsense1); + reg &= ~TEMPSENSE1_MEASURE_FREQ; + reg |= MEASURE_FREQ; + writel(reg, &anatop->tempsense1); + + /* start the measurement process */ + writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr); + writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); + writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set); + + /* make sure that the latest temp is valid */ + while ((readl(&anatop->tempsense0) & + TEMPSENSE0_FINISHED) == 0) + udelay(10000); + + /* read temperature count */ + reg = readl(&anatop->tempsense0); + n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK) + >> TEMPSENSE0_TEMP_CNT_SHIFT; + writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr); + + /* milli_Tmeas = c2 - Nmeas * c1 */ + temperature = (c2 - n_meas * c1)/1000; + + /* power down anatop thermal sensor */ + writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set); + writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr); + + return temperature; +} + +int imx_thermal_get_temp(struct udevice *dev, int *temp) +{ + int cpu_tmp = 0; + + cpu_tmp = read_cpu_temperature(dev); + while (cpu_tmp > TEMPERATURE_MIN && cpu_tmp < TEMPERATURE_MAX) { + if (cpu_tmp >= TEMPERATURE_HOT) { + printf("CPU Temperature is %d C, too hot to boot, waiting...\n", + cpu_tmp); + udelay(5000000); + cpu_tmp = read_cpu_temperature(dev); + } else { + break; + } + } + + *temp = cpu_tmp; + + return 0; +} + +static const struct dm_thermal_ops imx_thermal_ops = { + .get_temp = imx_thermal_get_temp, +}; + +static int imx_thermal_probe(struct udevice *dev) +{ + unsigned int fuse = ~0; + + const struct imx_thermal_plat *pdata = dev_get_platdata(dev); + unsigned int *priv = dev_get_priv(dev); + + /* Read Temperature calibration data fuse */ + fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse); + + /* Check for valid fuse */ + if (fuse == 0 || fuse == ~0) { + printf("CPU: Thermal invalid data, fuse: 0x%x\n", fuse); + return -EPERM; + } else { + printf("CPU: Thermal calibration data: 0x%x\n", fuse); + } + + *priv = fuse; + + enable_thermal_clk(); + + return 0; +} + +U_BOOT_DRIVER(imx_thermal) = { + .name = "imx_thermal", + .id = UCLASS_THERMAL, + .ops = &imx_thermal_ops, + .probe = imx_thermal_probe, + .priv_auto_alloc_size = sizeof(unsigned int), + .flags = DM_FLAG_PRE_RELOC, +}; diff --git a/drivers/thermal/thermal-uclass.c b/drivers/thermal/thermal-uclass.c new file mode 100644 index 0000000..3bee1a7 --- /dev/null +++ b/drivers/thermal/thermal-uclass.c @@ -0,0 +1,30 @@ +/* + * (C) Copyright 2014 Freescale Semiconductor, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <thermal.h> +#include <errno.h> +#include <fdtdec.h> +#include <malloc.h> +#include <asm/io.h> +#include <linux/list.h> + + +int thermal_get_temp(struct udevice *dev, int *temp) +{ + const struct dm_thermal_ops *ops = device_get_ops(dev); + + if (!ops->get_temp) + return -ENOSYS; + + return ops->get_temp(dev, temp); +} + +UCLASS_DRIVER(thermal) = { + .id = UCLASS_THERMAL, + .name = "thermal", +}; diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index a8944c9..202f59b 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -28,6 +28,7 @@ enum uclass_id { UCLASS_SPI_GENERIC, /* Generic SPI flash target */ UCLASS_SPI_FLASH, /* SPI flash */ UCLASS_CROS_EC, /* Chrome OS EC */ + UCLASS_THERMAL, /* Thermal sensor */

UCLASS_COUNT, UCLASS_INVALID = -1, diff --git a/include/imx_thermal.h b/include/imx_thermal.h new file mode 100644 index 0000000..be13652 --- /dev/null +++ b/include/imx_thermal.h @@ -0,0 +1,17 @@ +/* + * + * (C) Copyright 2014 Freescale Semiconductor, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _IMX_THERMAL_H_ +#define _IMX_THERMAL_H_ + +struct imx_thermal_plat { + void *regs; + int fuse_bank; + int fuse_word; +}; + +#endif /* _IMX_THERMAL_H_ */ diff --git a/include/thermal.h b/include/thermal.h new file mode 100644 index 0000000..80b549b --- /dev/null +++ b/include/thermal.h @@ -0,0 +1,42 @@ +/* + * + * (C) Copyright 2014 Freescale Semiconductor, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _THERMAL_H_ +#define _THERMAL_H_ + +#include <dm.h> + +int thermal_get_temp(struct udevice *dev, int *temp); + +/** + * struct struct dm_thermal_ops - Driver model Thermal operations + * + * The uclass interface is implemented by all Thermal devices which use + * driver model. + */ +struct dm_thermal_ops { + /** + * Get the current temperature + * + * The device provided is the slave device. It's parent controller + * will be used to provide the communication. + * + * This must be called before doing any transfers with a Thermal slave. It + * will enable and initialize any Thermal hardware as necessary, and make + * sure that the SCK line is in the correct idle state. It is not + * allowed to claim the same bus for several slaves without releasing + * the bus in between. + * + * @dev: The Thermal device + * + * Returns: 0 if the bus was claimed successfully, or a negative value + * if it wasn't. + */ + int (*get_temp)(struct udevice *dev, int *temp); +}; + +#endif /* _THERMAL_H_ */

Add imx6 thermal device to mx6 soc file. Read the cpu temperature using this device to access onchip thermal sensor.

Signed-off-by: Ye.Li B37916@freescale.com Signed-off-by: Nitin Garg nitin.garg@freescale.com --- arch/arm/cpu/armv7/mx6/soc.c | 15 +++++++++++++++ arch/arm/imx-common/cpu.c | 21 +++++++++++++++++++++ 2 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c index 5fd2a63..5f5f497 100644 --- a/arch/arm/cpu/armv7/mx6/soc.c +++ b/arch/arm/cpu/armv7/mx6/soc.c @@ -22,6 +22,8 @@ #include <asm/arch/mxc_hdmi.h> #include <asm/arch/crm_regs.h> #include <asm/bootm.h> +#include <dm.h> +#include <imx_thermal.h>

enum ldo_reg { LDO_ARM, @@ -37,6 +39,19 @@ struct scu_regs { u32 fpga_rev; };

+#if defined(CONFIG_IMX6_THERMAL) +static const struct imx_thermal_plat imx6_thermal_plat = { + .regs = (void *)ANATOP_BASE_ADDR, + .fuse_bank = 1, + .fuse_word = 6, +}; + +U_BOOT_DEVICE(imx6_thermal) = { + .name = "imx_thermal", + .platdata = &imx6_thermal_plat, +}; +#endif + u32 get_nr_cpus(void) { struct scu_regs *scu = (struct scu_regs *)SCU_BASE_ADDR; diff --git a/arch/arm/imx-common/cpu.c b/arch/arm/imx-common/cpu.c index 09fc227..e43f188 100644 --- a/arch/arm/imx-common/cpu.c +++ b/arch/arm/imx-common/cpu.c @@ -17,6 +17,7 @@ #include <asm/arch/sys_proto.h> #include <asm/arch/crm_regs.h> #include <ipu_pixfmt.h> +#include <thermal.h>

#ifdef CONFIG_FSL_ESDHC #include <fsl_esdhc.h> @@ -134,6 +135,11 @@ int print_cpuinfo(void) { u32 cpurev;

+#if defined(CONFIG_MX6) && defined(CONFIG_IMX6_THERMAL) + struct udevice *thermal_dev; + int cpu_tmp, ret; +#endif + cpurev = get_cpu_rev();

printf("CPU: Freescale i.MX%s rev%d.%d at %d MHz\n", @@ -141,6 +147,21 @@ int print_cpuinfo(void) (cpurev & 0x000F0) >> 4, (cpurev & 0x0000F) >> 0, mxc_get_clock(MXC_ARM_CLK) / 1000000); + +#if defined(CONFIG_MX6) && defined(CONFIG_IMX6_THERMAL) + ret = uclass_get_device(UCLASS_THERMAL, 0, &thermal_dev); + if (!ret) { + ret = thermal_get_temp(thermal_dev, &cpu_tmp); + + if (!ret) + printf("CPU: Temperature %d C\n", cpu_tmp); + else + printf("CPU: Temperature: invalid sensor data\n"); + } else { + printf("CPU: Temperature: Can't find sensor device\n"); + } +#endif + printf("Reset cause: %s\n", get_reset_cause()); return 0; }

Enable i.MX thermal DM driver to mx6sabre_common.h file. Since the thermal is used in init_sequence_f, so define the CONFIG_SYS_MALLOC_F_LEN to support DM driver using in pre relocation phase.

Additional, thermal driver depends on ocotp, make sure to enable CONFIG_MXC_OCOTP when CONFIG_IMX6_THERMAL is selected.

Signed-off-by: Ye.Li B37916@freescale.com Signed-off-by: Nitin Garg nitin.garg@freescale.com --- include/configs/mx6sabre_common.h | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/include/configs/mx6sabre_common.h b/include/configs/mx6sabre_common.h index 1e10422..9fdd841 100644 --- a/include/configs/mx6sabre_common.h +++ b/include/configs/mx6sabre_common.h @@ -25,6 +25,11 @@ #define CONFIG_INITRD_TAG #define CONFIG_REVISION_TAG

+#define CONFIG_DM +#define CONFIG_DM_THERMAL +#define CONFIG_SYS_MALLOC_F_LEN (1 << 10) +#define CONFIG_IMX6_THERMAL + #define CONFIG_SYS_GENERIC_BOARD

/* Size of malloc() pool */ @@ -37,7 +42,7 @@ #define CONFIG_MXC_UART

#define CONFIG_CMD_FUSE -#ifdef CONFIG_CMD_FUSE +#if defined(CONFIG_CMD_FUSE) || defined(CONFIG_IMX6_THERMAL) #define CONFIG_MXC_OCOTP #endif