diff options
Diffstat (limited to 'kernel/drivers/soc/brcmstb')
| -rw-r--r-- | kernel/drivers/soc/brcmstb/Kconfig | 9 | ||||
| -rw-r--r-- | kernel/drivers/soc/brcmstb/Makefile | 1 | ||||
| -rw-r--r-- | kernel/drivers/soc/brcmstb/biuctrl.c | 116 | ||||
| -rw-r--r-- | kernel/drivers/soc/brcmstb/common.c | 33 |
4 files changed, 159 insertions, 0 deletions
diff --git a/kernel/drivers/soc/brcmstb/Kconfig b/kernel/drivers/soc/brcmstb/Kconfig new file mode 100644 index 000000000..39cab3bd5 --- /dev/null +++ b/kernel/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/kernel/drivers/soc/brcmstb/Makefile b/kernel/drivers/soc/brcmstb/Makefile new file mode 100644 index 000000000..9120b2715 --- /dev/null +++ b/kernel/drivers/soc/brcmstb/Makefile @@ -0,0 +1 @@ +obj-y += common.o biuctrl.o diff --git a/kernel/drivers/soc/brcmstb/biuctrl.c b/kernel/drivers/soc/brcmstb/biuctrl.c new file mode 100644 index 000000000..9049c076f --- /dev/null +++ b/kernel/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/kernel/drivers/soc/brcmstb/common.c b/kernel/drivers/soc/brcmstb/common.c new file mode 100644 index 000000000..c262c029b --- /dev/null +++ b/kernel/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; +} |