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Message-id: <1378898048-25205-4-git-send-email-yadi.brar@samsung.com>
Date: Wed, 11 Sep 2013 16:44:07 +0530
From: Yadwinder Singh Brar <yadi.brar@...sung.com>
To: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org,
"Rafael J. Wysocki" <rjw@...k.pl>,
Viresh Kumar <viresh.kumar@...aro.org>,
MyungJoo Ham <myungjoo.ham@...sung.com>,
Kukjin Kim <kgene.kim@...sung.com>,
Thomas Abraham <thomas.abraham@...aro.org>,
Tomasz Figa <t.figa@...sung.com>,
Yadwinder Singh Brar <yadi.brar@...sung.com>
Subject: [RFC 3/4] power: asv: Add support for exynos5250
This patch adds basic support (only for ARM ASV) for exynos5250 chips which
have fused ASV group.
Signed-off-by: Yadwinder Singh Brar <yadi.brar@...sung.com>
---
drivers/power/asv/Makefile | 2 +-
drivers/power/asv/exynos-asv.c | 9 +++
drivers/power/asv/exynos-asv.h | 1 +
drivers/power/asv/exynos5250-asv.c | 141 ++++++++++++++++++++++++++++++++++++
4 files changed, 152 insertions(+), 1 deletions(-)
create mode 100644 drivers/power/asv/exynos5250-asv.c
diff --git a/drivers/power/asv/Makefile b/drivers/power/asv/Makefile
index 9a94868..a471c8e 100644
--- a/drivers/power/asv/Makefile
+++ b/drivers/power/asv/Makefile
@@ -1,2 +1,2 @@
obj-$(CONFIG_POWER_ASV) += asv.o
-obj-$(CONFIG_POWER_EXYNOS_ASV) += exynos-asv.o
+obj-$(CONFIG_POWER_EXYNOS_ASV) += exynos-asv.o exynos5250-asv.o
diff --git a/drivers/power/asv/exynos-asv.c b/drivers/power/asv/exynos-asv.c
index d3f43a4..7449b55 100644
--- a/drivers/power/asv/exynos-asv.c
+++ b/drivers/power/asv/exynos-asv.c
@@ -46,9 +46,18 @@ static int exynos_asv_probe(struct platform_device *pdev)
exynos_asv_info->base = base;
/* call SoC specific intialisation routine */
+ if (of_machine_is_compatible("samsung,exynos5250")) {
+ ret = exynos5250_asv_init(exynos_asv_info);
+ if (ret) {
+ pr_err("%s: exynos5250_asv_init failed : %d\n",
+ __func__, ret);
+ goto err;
+ }
+ }
register_asv_member(exynos_asv_info->asv_list, exynos_asv_info->nr_mem);
+err:
iounmap(base);
err_map:
of_node_put(chip_id);
diff --git a/drivers/power/asv/exynos-asv.h b/drivers/power/asv/exynos-asv.h
index 89a1ae8..a31becb 100644
--- a/drivers/power/asv/exynos-asv.h
+++ b/drivers/power/asv/exynos-asv.h
@@ -18,4 +18,5 @@ struct exynos_asv_common {
void __iomem *base;
};
+extern int exynos5250_asv_init(struct exynos_asv_common *exynos_info);
#endif /* __EXYNOS_ASV_D_H */
diff --git a/drivers/power/asv/exynos5250-asv.c b/drivers/power/asv/exynos5250-asv.c
new file mode 100644
index 0000000..293b3f1
--- /dev/null
+++ b/drivers/power/asv/exynos5250-asv.c
@@ -0,0 +1,141 @@
+/* exynos5250 - ASV(Adaptive Supply Voltage)
+ *
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * 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.
+*/
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/power/asv-driver.h>
+#include "exynos-asv.h"
+
+#define FUSED_SG_OFFSET 3
+#define ORIG_SG_OFFSET 17
+#define ORIG_SG_MASK 0xF
+#define MOD_SG_OFFSET 21
+#define MOD_SG_MASK 0x7
+
+#define ARM_LEVEL_NR 16
+#define ARM_GRP_NR 12
+
+#define CHIP_ID_OFFSET 0x4
+
+struct exynos5250_asv_info {
+ unsigned int package_id;
+ /* we may need more info as global data */
+};
+
+static struct exynos5250_asv_info asv_group __initdata;
+
+static unsigned int asv_voltage[ARM_LEVEL_NR][ARM_GRP_NR + 1] __initdata = {
+ { 1700000, 1300000, 1275000, 1275000, 1262500, 1250000, 1225000,
+ 1212500, 1200000, 1187500, 1175000, 1150000, 1125000 }, /* L0 */
+ { 1600000, 1250000, 1225000, 1225000, 1212500, 1200000, 1187500,
+ 1175000, 1162500, 1150000, 1137500, 1112500, 1100000 }, /* L1 */
+ { 1500000, 1225000, 1187500, 1175000, 1162500, 1150000, 1137500,
+ 1125000, 1112500, 1100000, 1087500, 1075000, 1062500 }, /* L2 */
+ { 1400000, 1200000, 1125000, 1125000, 1125000, 1112500, 1100000,
+ 1087500, 1075000, 1062500, 1050000, 1037500, 1025000 }, /* L3 */
+ { 1300000, 1150000, 1100000, 1100000, 1100000, 1087500, 1075000,
+ 1062500, 1050000, 1037500, 1025000, 1012500, 1000000 }, /* L4 */
+ { 1200000, 1125000, 1075000, 1075000, 1062500, 1050000, 1037500,
+ 1025000, 1012500, 1000000, 987500, 975000, 975000 }, /* L5 */
+ { 1100000, 1100000, 1050000, 1050000, 1037500, 1025000, 1012500,
+ 1000000, 987500, 975000, 962500, 950000, 925000 }, /* L6 */
+ { 1000000, 1075000, 1037500, 1037500, 1012500, 1000000, 987500,
+ 975000, 962500, 950000, 937500, 925000, 912500 }, /* L7 */
+ { 900000, 1050000, 1025000, 1012500, 987500, 975000, 962500,
+ 950000, 937500, 925000, 912500, 912500, 900000 }, /* L8 */
+ { 800000, 1025000, 1000000, 987500, 975000, 962500, 950000,
+ 937500, 925000, 912500, 900000, 900000, 900000 }, /* L9 */
+ { 700000, 1012500, 975000, 962500, 950000, 937500, 925000,
+ 912500, 900000, 900000, 900000, 900000, 900000 }, /* L10 */
+ { 600000, 1000000, 962500, 950000, 937500, 925000, 912500,
+ 900000, 900000, 900000, 900000, 900000, 900000 }, /* L11 */
+ { 500000, 975000, 950000, 937500, 925000, 912500, 900000,
+ 900000, 900000, 900000, 900000, 900000, 887500 }, /* L12 */
+ { 400000, 950000, 937500, 925000, 912500, 900000, 900000,
+ 900000, 900000, 900000, 900000, 887500, 887500 }, /* L13 */
+ { 300000, 937500, 925000, 912500, 900000, 900000, 900000,
+ 900000, 900000, 900000, 887500, 887500, 875000 }, /* L14 */
+ { 200000, 925000, 912500, 900000, 900000, 900000, 900000,
+ 900000, 900000, 887500, 887500, 875000, 875000 }, /* L15 */
+};
+
+static int __init exynos5250_get_asv_group(struct asv_info *asv_info)
+{
+ int exynos_asv_grp;
+ u32 exynos_orig_sp;
+ u32 exynos_mod_sp;
+ u32 package_id = asv_group.package_id;
+
+ /* If ASV group is fused then retrieve it */
+ if ((package_id >> FUSED_SG_OFFSET) & 0x1) {
+ exynos_orig_sp = (package_id >> ORIG_SG_OFFSET) & ORIG_SG_MASK;
+ exynos_mod_sp = (package_id >> MOD_SG_OFFSET) & MOD_SG_MASK;
+
+ exynos_asv_grp = exynos_orig_sp - exynos_mod_sp;
+ if (exynos_asv_grp < 0) {
+ pr_warn("%s: Invalid ASV group: %d\n", __func__,
+ exynos_asv_grp);
+ exynos_asv_grp = 0; /* go for default */
+ }
+ } else {
+ pr_warn("%s: ASV group not fused for : %s\n", __func__,
+ asv_info->name);
+ exynos_asv_grp = 0; /* go for default */
+ }
+
+ asv_info->asv_grp = exynos_asv_grp;
+ return 0;
+}
+
+static int __init exynos5250_init_arm_asv_table(struct asv_info *asv_info)
+{
+ struct asv_freq_table *dvfs_table;
+ int i, asv_grp = asv_info->asv_grp;
+
+ dvfs_table = kzalloc(sizeof(struct asv_freq_table) * ARM_LEVEL_NR,
+ GFP_KERNEL);
+ if (!dvfs_table)
+ return -ENOMEM;
+
+ for (i = 0; i < ARM_LEVEL_NR; i++) {
+ dvfs_table[i].freq = asv_voltage[i][0];
+ dvfs_table[i].volt = asv_voltage[i][asv_grp + 1];
+ }
+
+ asv_info->dvfs_table = dvfs_table;
+ return 0;
+}
+
+/* TODO: Implement .init_asv callback to set ABB value */
+
+static struct asv_ops exynos5250_arm_asv_ops __initdata = {
+ .get_asv_group = exynos5250_get_asv_group,
+ .init_asv_table = exynos5250_init_arm_asv_table,
+};
+
+static struct asv_info exynos5250_asv_member[] __initdata = {
+ {
+ .type = ASV_ARM,
+ .name = "VDD_ARM",
+ .ops = &exynos5250_arm_asv_ops,
+ .nr_dvfs_level = ARM_LEVEL_NR,
+ },
+};
+
+int __init exynos5250_asv_init(struct exynos_asv_common *exynos_info)
+{
+ asv_group.package_id = readl(exynos_info->base + CHIP_ID_OFFSET);
+
+ exynos_info->asv_list = exynos5250_asv_member;
+ exynos_info->nr_mem = ARRAY_SIZE(exynos5250_asv_member);
+
+ return 0;
+}
--
1.7.0.4
--
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