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Subject[PATCH v2 4/9] soc: brcmstb: Correct CPU_CREDIT_REG offset for Brahma-B53 CPUs
Date
On Broadcom Brahma-B53 CPUs, the CPU_CREDIT_REG offset got moved to
0x0b0 instead of 0x184, correct this such that we correcty
enable/disable write-pairing for these chips.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/soc/bcm/brcmstb/biuctrl.c | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/bcm/brcmstb/biuctrl.c b/drivers/soc/bcm/brcmstb/biuctrl.c
index c3c548fcaa8c..e8322e663831 100644
--- a/drivers/soc/bcm/brcmstb/biuctrl.c
+++ b/drivers/soc/bcm/brcmstb/biuctrl.c
@@ -21,12 +21,13 @@
#include <linux/syscore_ops.h>
#include <linux/soc/brcmstb/brcmstb.h>

-#define CPU_CREDIT_REG_OFFSET 0x184
+#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 = CPU_CREDIT_REG_OFFSET;
+static unsigned int cpu_credit_reg_offset;

static int __init mcp_write_pairing_set(void)
{
@@ -53,7 +54,7 @@ static int __init mcp_write_pairing_set(void)

static int __init setup_hifcpubiuctrl_regs(void)
{
- struct device_node *np;
+ struct device_node *np, *cpu_dn;
int ret = 0;

np = of_find_compatible_node(NULL, NULL, "brcm,brcmstb-cpu-biu-ctrl");
@@ -70,6 +71,23 @@ static int __init setup_hifcpubiuctrl_regs(void)
}

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"))
+ cpu_credit_reg_offset = B15_CPU_CREDIT_REG_OFFSET;
+ else if (of_device_is_compatible(cpu_dn, "brcm,brahma-b53"))
+ cpu_credit_reg_offset = B53_CPU_CREDIT_REG_OFFSET;
+ else {
+ pr_err("unsupported CPU\n");
+ ret = -EINVAL;
+ }
+ of_node_put(cpu_dn);
out:
of_node_put(np);
return ret;
--
2.9.3
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