1 files changed, 169 insertions, 23 deletions

diff --git a/drivers/soc/bcm/brcmstb/biuctrl.c b/drivers/soc/bcm/brcmstb/biuctrl.c
index 3c39415d484f..6d89ebf13b8a 100644
--- a/drivers/soc/bcm/brcmstb/biuctrl.c
+++ b/drivers/soc/bcm/brcmstb/biuctrl.c
@@ -21,11 +21,70 @@
 #include <linux/syscore_ops.h>
 #include <linux/soc/brcmstb/brcmstb.h>
 
-#define CPU_CREDIT_REG_OFFSET			0x184
 #define  CPU_CREDIT_REG_MCPx_WR_PAIRING_EN_MASK	0x70000000
+#define CPU_CREDIT_REG_MCPx_READ_CRED_MASK	0xf
+#define CPU_CREDIT_REG_MCPx_WRITE_CRED_MASK	0xf
+#define CPU_CREDIT_REG_MCPx_READ_CRED_SHIFT(x)	((x) * 8)
+#define CPU_CREDIT_REG_MCPx_WRITE_CRED_SHIFT(x)	(((x) * 8) + 4)
+
+#define CPU_MCP_FLOW_REG_MCPx_RDBUFF_CRED_SHIFT(x)	((x) * 8)
+#define CPU_MCP_FLOW_REG_MCPx_RDBUFF_CRED_MASK		0xff
+
+#define CPU_WRITEBACK_CTRL_REG_WB_THROTTLE_THRESHOLD_MASK	0xf
+#define CPU_WRITEBACK_CTRL_REG_WB_THROTTLE_TIMEOUT_MASK		0xf
+#define CPU_WRITEBACK_CTRL_REG_WB_THROTTLE_TIMEOUT_SHIFT	4
+#define CPU_WRITEBACK_CTRL_REG_WB_THROTTLE_ENABLE		BIT(8)
 
 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,
+	CPU_MCP_FLOW_REG,
+	CPU_WRITEBACK_CTRL_REG
+};
+
+static const int b15_cpubiuctrl_regs[] = {
+	[CPU_CREDIT_REG] = 0x184,
+	[CPU_MCP_FLOW_REG] = -1,
+	[CPU_WRITEBACK_CTRL_REG] = -1,
+};
+
+/* Odd cases, e.g: 7260 */
+static const int b53_cpubiuctrl_no_wb_regs[] = {
+	[CPU_CREDIT_REG] = 0x0b0,
+	[CPU_MCP_FLOW_REG] = 0x0b4,
+	[CPU_WRITEBACK_CTRL_REG] = -1,
+};
+
+static const int b53_cpubiuctrl_regs[] = {
+	[CPU_CREDIT_REG] = 0x0b0,
+	[CPU_MCP_FLOW_REG] = 0x0b4,
+	[CPU_WRITEBACK_CTRL_REG] = 0x22c,
+};
+
+#define NUM_CPU_BIUCTRL_REGS	3
 
 static int __init mcp_write_pairing_set(void)
 {
@@ -34,15 +93,15 @@ 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");
 	}
@@ -50,17 +109,64 @@ static int __init mcp_write_pairing_set(void)
 	return 0;
 }
 
-static int __init setup_hifcpubiuctrl_regs(void)
+static const u32 b53_mach_compat[] = {
+	0x7268,
+	0x7271,
+	0x7278,
+};
+
+static void __init mcp_b53_set(void)
 {
-	struct device_node *np;
-	int ret = 0;
+	unsigned int i;
+	u32 reg;
 
-	np = of_find_compatible_node(NULL, NULL, "brcm,brcmstb-cpu-biu-ctrl");
-	if (!np) {
-		pr_err("missing BIU control node\n");
-		return -ENODEV;
+	reg = brcmstb_get_family_id();
+
+	for (i = 0; i < ARRAY_SIZE(b53_mach_compat); i++) {
+		if (BRCM_ID(reg) == b53_mach_compat[i])
+			break;
 	}
 
+	if (i == ARRAY_SIZE(b53_mach_compat))
+		return;
+
+	/* Set all 3 MCP interfaces to 8 credits */
+	reg = cbc_readl(CPU_CREDIT_REG);
+	for (i = 0; i < 3; i++) {
+		reg &= ~(CPU_CREDIT_REG_MCPx_WRITE_CRED_MASK <<
+			 CPU_CREDIT_REG_MCPx_WRITE_CRED_SHIFT(i));
+		reg &= ~(CPU_CREDIT_REG_MCPx_READ_CRED_MASK <<
+			 CPU_CREDIT_REG_MCPx_READ_CRED_SHIFT(i));
+		reg |= 8 << CPU_CREDIT_REG_MCPx_WRITE_CRED_SHIFT(i);
+		reg |= 8 << CPU_CREDIT_REG_MCPx_READ_CRED_SHIFT(i);
+	}
+	cbc_writel(reg, CPU_CREDIT_REG);
+
+	/* Max out the number of in-flight Jwords reads on the MCP interface */
+	reg = cbc_readl(CPU_MCP_FLOW_REG);
+	for (i = 0; i < 3; i++)
+		reg |= CPU_MCP_FLOW_REG_MCPx_RDBUFF_CRED_MASK <<
+			CPU_MCP_FLOW_REG_MCPx_RDBUFF_CRED_SHIFT(i);
+	cbc_writel(reg, CPU_MCP_FLOW_REG);
+
+	/* Enable writeback throttling, set timeout to 128 cycles, 256 cycles
+	 * threshold
+	 */
+	reg = cbc_readl(CPU_WRITEBACK_CTRL_REG);
+	reg |= CPU_WRITEBACK_CTRL_REG_WB_THROTTLE_ENABLE;
+	reg &= ~CPU_WRITEBACK_CTRL_REG_WB_THROTTLE_THRESHOLD_MASK;
+	reg &= ~(CPU_WRITEBACK_CTRL_REG_WB_THROTTLE_TIMEOUT_MASK <<
+		 CPU_WRITEBACK_CTRL_REG_WB_THROTTLE_TIMEOUT_SHIFT);
+	reg |= 8;
+	reg |= 7 << CPU_WRITEBACK_CTRL_REG_WB_THROTTLE_TIMEOUT_SHIFT;
+	cbc_writel(reg, CPU_WRITEBACK_CTRL_REG);
+}
+
+static int __init setup_hifcpubiuctrl_regs(struct device_node *np)
+{
+	struct device_node *cpu_dn;
+	int ret = 0;
+
 	cpubiuctrl_base = of_iomap(np, 0);
 	if (!cpubiuctrl_base) {
 		pr_err("failed to remap BIU control base\n");
@@ -69,27 +175,56 @@ 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"))
+		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);
+
+	if (BRCM_ID(brcmstb_get_family_id()) == 0x7260)
+		cpubiuctrl_regs = b53_cpubiuctrl_no_wb_regs;
 out:
 	of_node_put(np);
 	return ret;
 }
 
 #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 = {
@@ -99,19 +234,30 @@ static struct syscore_ops brcmstb_cpu_credit_syscore_ops = {
 #endif
 
 
-void __init brcmstb_biuctrl_init(void)
+static int __init brcmstb_biuctrl_init(void)
 {
+	struct device_node *np;
 	int ret;
 
-	setup_hifcpubiuctrl_regs();
+	/* We might be running on a multi-platform kernel, don't make this a
+	 * fatal error, just bail out early
+	 */
+	np = of_find_compatible_node(NULL, NULL, "brcm,brcmstb-cpu-biu-ctrl");
+	if (!np)
+		return 0;
+
+	setup_hifcpubiuctrl_regs(np);
 
 	ret = mcp_write_pairing_set();
 	if (ret) {
 		pr_err("MCP: Unable to disable write pairing!\n");
-		return;
+		return ret;
 	}
 
+	mcp_b53_set();
 #ifdef CONFIG_PM_SLEEP
 	register_syscore_ops(&brcmstb_cpu_credit_syscore_ops);
 #endif
+	return 0;
 }
+early_initcall(brcmstb_biuctrl_init);