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/*
* 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>
#include <linux/soc/brcmstb/brcmstb.h>
#define CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK 0x70000000
static void __iomem *cpubiuctrl_base;
static bool mcp_wr_pairing_en;
static const int *cpubiuctrl_regs;
static inline u32 cbc_readl(int reg)
{
int offset = cpubiuctrl_regs[reg];
if (offset == -1)
return (u32)-1;
return readl_relaxed(cpubiuctrl_base + offset);
}
static inline void cbc_writel(u32 val, int reg)
{
int offset = cpubiuctrl_regs[reg];
if (offset == -1)
return;
writel_relaxed(val, cpubiuctrl_base + offset);
}
enum cpubiuctrl_regs {
CPU_CREDIT_REG = 0,
};
static const int b15_cpubiuctrl_regs[] = {
[CPU_CREDIT_REG] = 0x184,
};
static const int b53_cpubiuctrl_regs[] = {
[CPU_CREDIT_REG] = 0x0b0,
};
#define NUM_CPU_BIUCTRL_REGS 1
static int __init mcp_write_pairing_set(void)
{
u32 creds = 0;
if (!cpubiuctrl_base)
return -1;
creds = cbc_readl(CPU_CREDIT_REG);
if (mcp_wr_pairing_en) {
pr_info("MCP: Enabling write pairing\n");
cbc_writel(creds | CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK,
CPU_CREDIT_REG);
} else if (creds & CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK) {
pr_info("MCP: Disabling write pairing\n");
cbc_writel(creds & ~CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK,
CPU_CREDIT_REG);
} else {
pr_info("MCP: Write pairing already disabled\n");
}
return 0;
}
static int __init setup_hifcpubiuctrl_regs(void)
{
struct device_node *np, *cpu_dn;
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");
cpu_dn = of_get_cpu_node(0, NULL);
if (!cpu_dn) {
pr_err("failed to obtain CPU device node\n");
ret = -ENODEV;
goto out;
}
if (of_device_is_compatible(cpu_dn, "brcm,brahma-b15"))
cpubiuctrl_regs = b15_cpubiuctrl_regs;
else if (of_device_is_compatible(cpu_dn, "brcm,brahma-b53"))
cpubiuctrl_regs = b53_cpubiuctrl_regs;
else {
pr_err("unsupported CPU\n");
ret = -EINVAL;
}
of_node_put(cpu_dn);
out:
of_node_put(np);
return ret;
}
#ifdef CONFIG_PM_SLEEP
static u32 cpubiuctrl_reg_save[NUM_CPU_BIUCTRL_REGS];
static int brcmstb_cpu_credit_reg_suspend(void)
{
unsigned int i;
if (!cpubiuctrl_base)
return 0;
for (i = 0; i < NUM_CPU_BIUCTRL_REGS; i++)
cpubiuctrl_reg_save[i] = cbc_readl(i);
return 0;
}
static void brcmstb_cpu_credit_reg_resume(void)
{
unsigned int i;
if (!cpubiuctrl_base)
return;
for (i = 0; i < NUM_CPU_BIUCTRL_REGS; i++)
cbc_writel(cpubiuctrl_reg_save[i], i);
}
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
}
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