Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 265 insertions, 0 deletions

diff --git a/drivers/soc/bcm/brcmstb/biuctrl.c b/drivers/soc/bcm/brcmstb/biuctrl.c
new file mode 100644
index 000000000..20b63bee5
--- /dev/null
+++ b/drivers/soc/bcm/brcmstb/biuctrl.c
@@ -0,0 +1,265 @@
+/*
+ * 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
+#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(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)
+{
+	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 const u32 b53_mach_compat[] = {
+	0x7268,
+	0x7271,
+	0x7278,
+};
+
+static void __init mcp_b53_set(void)
+{
+	unsigned int i;
+	u32 reg;
+
+	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");
+		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);
+
+	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 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
+
+
+static int __init brcmstb_biuctrl_init(void)
+{
+	struct device_node *np;
+	int ret;
+
+	/* 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;
+
+	ret = setup_hifcpubiuctrl_regs(np);
+	if (ret)
+		return ret;
+
+	ret = mcp_write_pairing_set();
+	if (ret) {
+		pr_err("MCP: Unable to disable write pairing!\n");
+		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);