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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /drivers/soc/brcmstb
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'drivers/soc/brcmstb')
-rw-r--r--drivers/soc/brcmstb/Kconfig9
-rw-r--r--drivers/soc/brcmstb/Makefile1
-rw-r--r--drivers/soc/brcmstb/biuctrl.c116
-rw-r--r--drivers/soc/brcmstb/common.c33
4 files changed, 159 insertions, 0 deletions
diff --git a/drivers/soc/brcmstb/Kconfig b/drivers/soc/brcmstb/Kconfig
new file mode 100644
index 000000000..39cab3bd5
--- /dev/null
+++ b/drivers/soc/brcmstb/Kconfig
@@ -0,0 +1,9 @@
+menuconfig SOC_BRCMSTB
+ bool "Broadcom STB SoC drivers"
+ depends on ARM
+ help
+ Enables drivers for the Broadcom Set-Top Box (STB) series of chips.
+ This option alone enables only some support code, while the drivers
+ can be enabled individually within this menu.
+
+ If unsure, say N.
diff --git a/drivers/soc/brcmstb/Makefile b/drivers/soc/brcmstb/Makefile
new file mode 100644
index 000000000..9120b2715
--- /dev/null
+++ b/drivers/soc/brcmstb/Makefile
@@ -0,0 +1 @@
+obj-y += common.o biuctrl.o
diff --git a/drivers/soc/brcmstb/biuctrl.c b/drivers/soc/brcmstb/biuctrl.c
new file mode 100644
index 000000000..9049c076f
--- /dev/null
+++ b/drivers/soc/brcmstb/biuctrl.c
@@ -0,0 +1,116 @@
+/*
+ * Broadcom STB SoCs Bus Unit Interface controls
+ *
+ * Copyright (C) 2015, Broadcom Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "brcmstb: " KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/syscore_ops.h>
+
+#define CPU_CREDIT_REG_OFFSET 0x184
+#define CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK 0x70000000
+
+static void __iomem *cpubiuctrl_base;
+static bool mcp_wr_pairing_en;
+
+static int __init mcp_write_pairing_set(void)
+{
+ u32 creds = 0;
+
+ if (!cpubiuctrl_base)
+ return -1;
+
+ creds = readl_relaxed(cpubiuctrl_base + CPU_CREDIT_REG_OFFSET);
+ if (mcp_wr_pairing_en) {
+ pr_info("MCP: Enabling write pairing\n");
+ writel_relaxed(creds | CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK,
+ cpubiuctrl_base + CPU_CREDIT_REG_OFFSET);
+ } else if (creds & CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK) {
+ pr_info("MCP: Disabling write pairing\n");
+ writel_relaxed(creds & ~CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK,
+ cpubiuctrl_base + CPU_CREDIT_REG_OFFSET);
+ } else {
+ pr_info("MCP: Write pairing already disabled\n");
+ }
+
+ return 0;
+}
+
+static int __init setup_hifcpubiuctrl_regs(void)
+{
+ struct device_node *np;
+ int ret = 0;
+
+ np = of_find_compatible_node(NULL, NULL, "brcm,brcmstb-cpu-biu-ctrl");
+ if (!np) {
+ pr_err("missing BIU control node\n");
+ return -ENODEV;
+ }
+
+ cpubiuctrl_base = of_iomap(np, 0);
+ if (!cpubiuctrl_base) {
+ pr_err("failed to remap BIU control base\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ mcp_wr_pairing_en = of_property_read_bool(np, "brcm,write-pairing");
+out:
+ of_node_put(np);
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static u32 cpu_credit_reg_dump; /* for save/restore */
+
+static int brcmstb_cpu_credit_reg_suspend(void)
+{
+ if (cpubiuctrl_base)
+ cpu_credit_reg_dump =
+ readl_relaxed(cpubiuctrl_base + CPU_CREDIT_REG_OFFSET);
+ return 0;
+}
+
+static void brcmstb_cpu_credit_reg_resume(void)
+{
+ if (cpubiuctrl_base)
+ writel_relaxed(cpu_credit_reg_dump,
+ cpubiuctrl_base + CPU_CREDIT_REG_OFFSET);
+}
+
+static struct syscore_ops brcmstb_cpu_credit_syscore_ops = {
+ .suspend = brcmstb_cpu_credit_reg_suspend,
+ .resume = brcmstb_cpu_credit_reg_resume,
+};
+#endif
+
+
+void __init brcmstb_biuctrl_init(void)
+{
+ int ret;
+
+ setup_hifcpubiuctrl_regs();
+
+ ret = mcp_write_pairing_set();
+ if (ret) {
+ pr_err("MCP: Unable to disable write pairing!\n");
+ return;
+ }
+
+#ifdef CONFIG_PM_SLEEP
+ register_syscore_ops(&brcmstb_cpu_credit_syscore_ops);
+#endif
+}
diff --git a/drivers/soc/brcmstb/common.c b/drivers/soc/brcmstb/common.c
new file mode 100644
index 000000000..c262c029b
--- /dev/null
+++ b/drivers/soc/brcmstb/common.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright © 2014 NVIDIA Corporation
+ * Copyright © 2015 Broadcom Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/of.h>
+
+#include <soc/brcmstb/common.h>
+
+static const struct of_device_id brcmstb_machine_match[] = {
+ { .compatible = "brcm,brcmstb", },
+ { }
+};
+
+bool soc_is_brcmstb(void)
+{
+ struct device_node *root;
+
+ root = of_find_node_by_path("/");
+ if (!root)
+ return false;
+
+ return of_match_node(brcmstb_machine_match, root) != NULL;
+}