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soc: brcmstb: biuctrl: Prepare for saving/restoring other registers 

In preparation for saving/restoring additional registers required on
some newer platforms (7268, 7271, 7278), migrate the code to use enums
and helper functions to access registers.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Florian Fainelli 2017-02-27 16:36:17 -08:00
parent 22f7a9116e
commit 584e55d543
1 changed files with 58 additions and 17 deletions
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75
drivers/soc/bcm/brcmstb/biuctrl.c
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@ -21,13 +21,45 @@
#include <linux/syscore_ops.h>
#include <linux/soc/brcmstb/brcmstb.h>
#define B15_CPU_CREDIT_REG_OFFSET 0x184
#define B53_CPU_CREDIT_REG_OFFSET 0x0b0
#define CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK 0x70000000
static void __iomem *cpubiuctrl_base;
static bool mcp_wr_pairing_en;
static unsigned int cpu_credit_reg_offset;
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)
{
@ -36,15 +68,15 @@ static int __init mcp_write_pairing_set(void)
if (!cpubiuctrl_base)
return -1;
creds = readl_relaxed(cpubiuctrl_base + cpu_credit_reg_offset);
creds = cbc_readl(CPU_CREDIT_REG);
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);
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");
writel_relaxed(creds & ~CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK,
cpubiuctrl_base + cpu_credit_reg_offset);
cbc_writel(creds & ~CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK,
CPU_CREDIT_REG);
} else {
pr_info("MCP: Write pairing already disabled\n");
}
@ -80,9 +112,9 @@ static int __init setup_hifcpubiuctrl_regs(void)
}
if (of_device_is_compatible(cpu_dn, "brcm,brahma-b15"))
cpu_credit_reg_offset = B15_CPU_CREDIT_REG_OFFSET;
cpubiuctrl_regs = b15_cpubiuctrl_regs;
else if (of_device_is_compatible(cpu_dn, "brcm,brahma-b53"))
cpu_credit_reg_offset = B53_CPU_CREDIT_REG_OFFSET;
cpubiuctrl_regs = b53_cpubiuctrl_regs;
else {
pr_err("unsupported CPU\n");
ret = -EINVAL;
@ -94,21 +126,30 @@ out:
}
#ifdef CONFIG_PM_SLEEP
static u32 cpu_credit_reg_dump; /* for save/restore */
static u32 cpubiuctrl_reg_save[NUM_CPU_BIUCTRL_REGS];
static int brcmstb_cpu_credit_reg_suspend(void)
{
if (cpubiuctrl_base)
cpu_credit_reg_dump =
readl_relaxed(cpubiuctrl_base + cpu_credit_reg_offset);
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)
{
if (cpubiuctrl_base)
writel_relaxed(cpu_credit_reg_dump,
cpubiuctrl_base + cpu_credit_reg_offset);
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 = {