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authorDavid Hendricks <dhendrix@chromium.org>2013-04-18 14:01:45 -0700
committerDavid Hendricks <dhendrix@chromium.org>2013-04-19 04:19:10 +0200
commit90a70093b1ca20781b7a92dd04500881a94539b2 (patch)
tree9d1b8950b36078d93fe9be9d208cda4ce199a555
parentb9e6e1ab35c54ed5bd32a2f25a86f73c46d1acb3 (diff)
downloadcoreboot-90a70093b1ca20781b7a92dd04500881a94539b2.tar.xz
[1/3] exynos5: import thermal management unit code
This simply imports the Exynos TMU driver from u-boot. It is not built and thus should not break anything. Change-Id: I7861132fbf97f864e4250ffbda1ef3843f296ddc Signed-off-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: http://review.coreboot.org/3106 Reviewed-by: Ronald G. Minnich <rminnich@gmail.com> Tested-by: build bot (Jenkins)
-rw-r--r--src/cpu/samsung/exynos5-common/exynos-tmu.c318
1 files changed, 318 insertions, 0 deletions
diff --git a/src/cpu/samsung/exynos5-common/exynos-tmu.c b/src/cpu/samsung/exynos5-common/exynos-tmu.c
new file mode 100644
index 0000000000..f908076a85
--- /dev/null
+++ b/src/cpu/samsung/exynos5-common/exynos-tmu.c
@@ -0,0 +1,318 @@
+/*
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ * Akshay Saraswat <Akshay.s@samsung.com>
+ *
+ * EXYNOS - Thermal Management Unit
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <asm/arch/exynos-tmu.h>
+#include <asm/arch/power.h>
+
+#define TRIMINFO_RELOAD 1
+#define CORE_EN 1
+#define THERM_TRIP_EN (1 << 12)
+
+#define INTEN_RISE0 1
+#define INTEN_RISE1 (1 << 4)
+#define INTEN_RISE2 (1 << 8)
+#define INTEN_FALL0 (1 << 16)
+#define INTEN_FALL1 (1 << 20)
+#define INTEN_FALL2 (1 << 24)
+
+#define TRIM_INFO_MASK 0xff
+
+#define INTCLEAR_RISE0 1
+#define INTCLEAR_RISE1 (1 << 4)
+#define INTCLEAR_RISE2 (1 << 8)
+#define INTCLEAR_FALL0 (1 << 16)
+#define INTCLEAR_FALL1 (1 << 20)
+#define INTCLEAR_FALL2 (1 << 24)
+#define INTCLEARALL (INTCLEAR_RISE0 | INTCLEAR_RISE1 | \
+ INTCLEAR_RISE2 | INTCLEAR_FALL0 | \
+ INTCLEAR_FALL1 | INTCLEAR_FALL2)
+
+/* Tmeperature threshold values for various thermal events */
+struct temperature_params {
+ /* minimum value in temperature code range */
+ unsigned int min_val;
+ /* maximum value in temperature code range */
+ unsigned int max_val;
+ /* temperature threshold to start warning */
+ unsigned int start_warning;
+ /* temperature threshold CPU tripping */
+ unsigned int start_tripping;
+ /* temperature threshold for HW tripping */
+ unsigned int hardware_tripping;
+};
+
+/* Pre-defined values and thresholds for calibration of current temperature */
+struct tmu_data {
+ /* pre-defined temperature thresholds */
+ struct temperature_params ts;
+ /* pre-defined efuse range minimum value */
+ unsigned int efuse_min_value;
+ /* pre-defined efuse value for temperature calibration */
+ unsigned int efuse_value;
+ /* pre-defined efuse range maximum value */
+ unsigned int efuse_max_value;
+ /* current temperature sensing slope */
+ unsigned int slope;
+};
+
+/* TMU device specific details and status */
+struct tmu_info {
+ /* base Address for the TMU */
+ unsigned tmu_base;
+ /* mux Address for the TMU */
+ int tmu_mux;
+ /* pre-defined values for calibration and thresholds */
+ struct tmu_data data;
+ /* value required for triminfo_25 calibration */
+ unsigned int te1;
+ /* value required for triminfo_85 calibration */
+ unsigned int te2;
+ /* TMU DC value for threshold calculation */
+ int dc_value;
+ /* enum value indicating status of the TMU */
+ int tmu_state;
+};
+
+/* Global struct tmu_info variable to store init values */
+static struct tmu_info gbl_info;
+
+/*
+ * After reading temperature code from register, compensating
+ * its value and calculating celsius temperatue,
+ * get current temperatue.
+ *
+ * @return current temperature of the chip as sensed by TMU
+ */
+int get_cur_temp(struct tmu_info *info)
+{
+ int cur_temp;
+ struct tmu_reg *reg = (struct tmu_reg *)info->tmu_base;
+
+ /* Temperature code range between min 25 and max 125 */
+ cur_temp = readl(&reg->current_temp) & 0xff;
+
+ /* Calibrate current temperature */
+ if (cur_temp)
+ cur_temp = cur_temp - info->te1 + info->dc_value;
+
+ return cur_temp;
+}
+
+/*
+ * Monitors status of the TMU device and exynos temperature
+ *
+ * @param temp pointer to the current temperature value
+ * @return enum tmu_status_t value, code indicating event to execute
+ */
+enum tmu_status_t tmu_monitor(int *temp)
+{
+ if (gbl_info.tmu_state == TMU_STATUS_INIT)
+ return -1;
+
+ int cur_temp;
+ struct tmu_data *data = &gbl_info.data;
+
+ /* Read current temperature of the SOC */
+ cur_temp = get_cur_temp(&gbl_info);
+ *temp = cur_temp;
+
+ /* Temperature code lies between min 25 and max 125 */
+ if (cur_temp >= data->ts.start_tripping &&
+ cur_temp <= data->ts.max_val)
+ return TMU_STATUS_TRIPPED;
+ else if (cur_temp >= data->ts.start_warning)
+ return TMU_STATUS_WARNING;
+ else if (cur_temp < data->ts.start_warning &&
+ cur_temp >= data->ts.min_val)
+ return TMU_STATUS_NORMAL;
+ /* Temperature code does not lie between min 25 and max 125 */
+ else {
+ gbl_info.tmu_state = TMU_STATUS_INIT;
+ debug("EXYNOS_TMU: Thermal reading failed\n");
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * Get TMU specific pre-defined values from FDT
+ *
+ * @param info pointer to the tmu_info struct
+ * @param blob FDT blob
+ * @return int value, 0 for success
+ */
+int get_tmu_fdt_values(struct tmu_info *info, const void *blob)
+{
+ int node;
+ int error = 0;
+
+ /* Get the node from FDT for TMU */
+ node = fdtdec_next_compatible(blob, 0,
+ COMPAT_SAMSUNG_EXYNOS_TMU);
+ if (node < 0) {
+ debug("EXYNOS_TMU: No node for tmu in device tree\n");
+ return -1;
+ }
+
+ /*
+ * Get the pre-defined TMU specific values from FDT.
+ * All of these are expected to be correct otherwise
+ * miscalculation of register values in tmu_setup_parameters
+ * may result in misleading current temperature.
+ */
+ info->tmu_base = fdtdec_get_addr(blob, node, "reg");
+ if (info->tmu_base == FDT_ADDR_T_NONE) {
+ debug("%s: Missing tmu-base\n", __func__);
+ return -1;
+ }
+ info->tmu_mux = fdtdec_get_int(blob,
+ node, "samsung,mux", -1);
+ error |= info->tmu_mux;
+ info->data.ts.min_val = fdtdec_get_int(blob,
+ node, "samsung,min-temp", -1);
+ error |= info->data.ts.min_val;
+ info->data.ts.max_val = fdtdec_get_int(blob,
+ node, "samsung,max-temp", -1);
+ error |= info->data.ts.max_val;
+ info->data.ts.start_warning = fdtdec_get_int(blob,
+ node, "samsung,start-warning", -1);
+ error |= info->data.ts.start_warning;
+ info->data.ts.start_tripping = fdtdec_get_int(blob,
+ node, "samsung,start-tripping", -1);
+ error |= info->data.ts.start_tripping;
+ info->data.ts.hardware_tripping = fdtdec_get_int(blob,
+ node, "samsung,hw-tripping", -1);
+ error |= info->data.ts.hardware_tripping;
+ info->data.efuse_min_value = fdtdec_get_int(blob,
+ node, "samsung,efuse-min-value", -1);
+ error |= info->data.efuse_min_value;
+ info->data.efuse_value = fdtdec_get_int(blob,
+ node, "samsung,efuse-value", -1);
+ error |= info->data.efuse_value;
+ info->data.efuse_max_value = fdtdec_get_int(blob,
+ node, "samsung,efuse-max-value", -1);
+ error |= info->data.efuse_max_value;
+ info->data.slope = fdtdec_get_int(blob,
+ node, "samsung,slope", -1);
+ error |= info->data.slope;
+ info->dc_value = fdtdec_get_int(blob,
+ node, "samsung,dc-value", -1);
+ error |= info->dc_value;
+
+ if (error == -1) {
+ debug("fail to get tmu node properties\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Calibrate and calculate threshold values and
+ * enable interrupt levels
+ *
+ * @param info pointer to the tmu_info struct
+ */
+void tmu_setup_parameters(struct tmu_info *info)
+{
+ unsigned int te_temp, con;
+ unsigned int warning_code, trip_code, hwtrip_code;
+ unsigned int cooling_temp;
+ unsigned int rising_value;
+ struct tmu_data *data = &info->data;
+ struct tmu_reg *reg = (struct tmu_reg *)info->tmu_base;
+
+ /* Must reload for using efuse value at EXYNOS */
+ writel(TRIMINFO_RELOAD, &reg->triminfo_control);
+
+ /* Get the compensation parameter */
+ te_temp = readl(&reg->triminfo);
+ info->te1 = te_temp & TRIM_INFO_MASK;
+ info->te2 = ((te_temp >> 8) & TRIM_INFO_MASK);
+
+ if ((data->efuse_min_value > info->te1) ||
+ (info->te1 > data->efuse_max_value)
+ || (info->te2 != 0))
+ info->te1 = data->efuse_value;
+
+ /* Get RISING & FALLING Threshold value */
+ warning_code = data->ts.start_warning
+ + info->te1 - info->dc_value;
+ trip_code = data->ts.start_tripping
+ + info->te1 - info->dc_value;
+ hwtrip_code = data->ts.hardware_tripping
+ + info->te1 - info->dc_value;
+
+ cooling_temp = 0;
+
+ rising_value = ((warning_code << 8) |
+ (trip_code << 16) |
+ (hwtrip_code << 24));
+
+ /* Set interrupt level */
+ writel(rising_value, &reg->threshold_temp_rise);
+ writel(cooling_temp, &reg->threshold_temp_fall);
+
+ /*
+ * Need to init all register settings after getting parameter info
+ * [28:23] vref [11:8] slope - Tuning parameter
+ *
+ * WARNING: this slope value writes into many bits in the tmu_control
+ * register, with the default FDT value of 268470274 (0x10008802)
+ * we are using this essentially sets the default register setting
+ * from the TRM for tmu_control.
+ * TODO(bhthompson): rewrite this code such that we are not performing
+ * a hard wipe of tmu_control and re verify functionality.
+ */
+ writel(data->slope, &reg->tmu_control);
+
+ writel(INTCLEARALL, &reg->intclear);
+ /* TMU core enable */
+ con = readl(&reg->tmu_control);
+ con |= (info->tmu_mux << 20) | THERM_TRIP_EN | CORE_EN;
+
+ writel(con, &reg->tmu_control);
+
+ /* Enable HW thermal trip */
+ power_enable_hw_thermal_trip();
+
+ /* LEV1 LEV2 interrupt enable */
+ writel(INTEN_RISE1 | INTEN_RISE2, &reg->inten);
+}
+
+/*
+ * Initialize TMU device
+ *
+ * @param blob FDT blob
+ * @return int value, 0 for success
+ */
+int tmu_init(const void *blob)
+{
+ gbl_info.tmu_state = TMU_STATUS_INIT;
+ if (get_tmu_fdt_values(&gbl_info, blob) < 0)
+ return -1;
+
+ tmu_setup_parameters(&gbl_info);
+ gbl_info.tmu_state = TMU_STATUS_NORMAL;
+
+ return 0;
+}