projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9a764234 FF |
1 | /* |
| 2 | * Broadcom STB SoCs Bus Unit Interface controls | |
| 3 | * | |
| 4 | * Copyright (C) 2015, Broadcom Corporation | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | */ | |
| 15 | ||
| 16 | #define pr_fmt(fmt) "brcmstb: " KBUILD_MODNAME ": " fmt | |
| 17 | ||
| 18 | #include <linux/kernel.h> | |
| 19 | #include <linux/io.h> | |
| 20 | #include <linux/of_address.h> | |
| 21 | #include <linux/syscore_ops.h> | |
| 22 | ||
| 23 | #define CPU_CREDIT_REG_OFFSET 0x184 | |
| 24 | #define CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK 0x70000000 | |
| 25 | ||
| 26 | static void __iomem *cpubiuctrl_base; | |
| 27 | static bool mcp_wr_pairing_en; | |
| 28 | ||
| 29 | static int __init mcp_write_pairing_set(void) | |
| 30 | { | |
| 31 | u32 creds = 0; | |
| 32 | ||
| 33 | if (!cpubiuctrl_base) | |
| 34 | return -1; | |
| 35 | ||
| 36 | creds = readl_relaxed(cpubiuctrl_base + CPU_CREDIT_REG_OFFSET); | |
| 37 | if (mcp_wr_pairing_en) { | |
| 38 | pr_info("MCP: Enabling write pairing\n"); | |
| 39 | writel_relaxed(creds | CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK, | |
| 40 | cpubiuctrl_base + CPU_CREDIT_REG_OFFSET); | |
| 41 | } else if (creds & CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK) { | |
| 42 | pr_info("MCP: Disabling write pairing\n"); | |
| 43 | writel_relaxed(creds & ~CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK, | |
| 44 | cpubiuctrl_base + CPU_CREDIT_REG_OFFSET); | |
| 45 | } else { | |
| 46 | pr_info("MCP: Write pairing already disabled\n"); | |
| 47 | } | |
| 48 | ||
| 49 | return 0; | |
| 50 | } | |
| 51 | ||
| 52 | static int __init setup_hifcpubiuctrl_regs(void) | |
| 53 | { | |
| 54 | struct device_node *np; | |
| 55 | int ret = 0; | |
| 56 | ||
| 57 | np = of_find_compatible_node(NULL, NULL, "brcm,brcmstb-cpu-biu-ctrl"); | |
| 58 | if (!np) { | |
| 59 | pr_err("missing BIU control node\n"); | |
| 60 | return -ENODEV; | |
| 61 | } | |
| 62 | ||
| 63 | cpubiuctrl_base = of_iomap(np, 0); | |
| 64 | if (!cpubiuctrl_base) { | |
| 65 | pr_err("failed to remap BIU control base\n"); | |
| 66 | ret = -ENOMEM; | |
| 67 | goto out; | |
| 68 | } | |
| 69 | ||
| 70 | mcp_wr_pairing_en = of_property_read_bool(np, "brcm,write-pairing"); | |
| 71 | out: | |
| 72 | of_node_put(np); | |
| 73 | return ret; | |
| 74 | } | |
| 75 | ||
| 76 | #ifdef CONFIG_PM_SLEEP | |
| 77 | static u32 cpu_credit_reg_dump; /* for save/restore */ | |
| 78 | ||
| 79 | static int brcmstb_cpu_credit_reg_suspend(void) | |
| 80 | { | |
| 81 | if (cpubiuctrl_base) | |
| 82 | cpu_credit_reg_dump = | |
| 83 | readl_relaxed(cpubiuctrl_base + CPU_CREDIT_REG_OFFSET); | |
| 84 | return 0; | |
| 85 | } | |
| 86 | ||
| 87 | static void brcmstb_cpu_credit_reg_resume(void) | |
| 88 | { | |
| 89 | if (cpubiuctrl_base) | |
| 90 | writel_relaxed(cpu_credit_reg_dump, | |
| 91 | cpubiuctrl_base + CPU_CREDIT_REG_OFFSET); | |
| 92 | } | |
| 93 | ||
| 94 | static struct syscore_ops brcmstb_cpu_credit_syscore_ops = { | |
| 95 | .suspend = brcmstb_cpu_credit_reg_suspend, | |
| 96 | .resume = brcmstb_cpu_credit_reg_resume, | |
| 97 | }; | |
| 98 | #endif | |
| 99 | ||
| 100 | ||
| 101 | void __init brcmstb_biuctrl_init(void) | |
| 102 | { | |
| 103 | int ret; | |
| 104 | ||
| 105 | setup_hifcpubiuctrl_regs(); | |
| 106 | ||
| 107 | ret = mcp_write_pairing_set(); | |
| 108 | if (ret) { | |
| 109 | pr_err("MCP: Unable to disable write pairing!\n"); | |
| 110 | return; | |
| 111 | } | |
| 112 | ||
| 113 | #ifdef CONFIG_PM_SLEEP | |
| 114 | register_syscore_ops(&brcmstb_cpu_credit_syscore_ops); | |
| 115 | #endif | |
| 116 | } |