initial_commit

1 files changed, 312 insertions, 0 deletions

diff --git a/arch/arm/plat-s5p/sysmmu.c b/arch/arm/plat-s5p/sysmmu.c
new file mode 100644
index 00000000..54f5eddc
--- /dev/null
+++ b/arch/arm/plat-s5p/sysmmu.c
@@ -0,0 +1,312 @@
+/* linux/arch/arm/plat-s5p/sysmmu.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * 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.
+ */
+
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <asm/pgtable.h>
+
+#include <mach/map.h>
+#include <mach/regs-sysmmu.h>
+#include <plat/sysmmu.h>
+
+#define CTRL_ENABLE	0x5
+#define CTRL_BLOCK	0x7
+#define CTRL_DISABLE	0x0
+
+static struct device *dev;
+
+static unsigned short fault_reg_offset[SYSMMU_FAULTS_NUM] = {
+	S5P_PAGE_FAULT_ADDR,
+	S5P_AR_FAULT_ADDR,
+	S5P_AW_FAULT_ADDR,
+	S5P_DEFAULT_SLAVE_ADDR,
+	S5P_AR_FAULT_ADDR,
+	S5P_AR_FAULT_ADDR,
+	S5P_AW_FAULT_ADDR,
+	S5P_AW_FAULT_ADDR
+};
+
+static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = {
+	"PAGE FAULT",
+	"AR MULTI-HIT FAULT",
+	"AW MULTI-HIT FAULT",
+	"BUS ERROR",
+	"AR SECURITY PROTECTION FAULT",
+	"AR ACCESS PROTECTION FAULT",
+	"AW SECURITY PROTECTION FAULT",
+	"AW ACCESS PROTECTION FAULT"
+};
+
+static int (*fault_handlers[S5P_SYSMMU_TOTAL_IPNUM])(
+		enum S5P_SYSMMU_INTERRUPT_TYPE itype,
+		unsigned long pgtable_base,
+		unsigned long fault_addr);
+
+/*
+ * If adjacent 2 bits are true, the system MMU is enabled.
+ * The system MMU is disabled, otherwise.
+ */
+static unsigned long sysmmu_states;
+
+static inline void set_sysmmu_active(sysmmu_ips ips)
+{
+	sysmmu_states |= 3 << (ips * 2);
+}
+
+static inline void set_sysmmu_inactive(sysmmu_ips ips)
+{
+	sysmmu_states &= ~(3 << (ips * 2));
+}
+
+static inline int is_sysmmu_active(sysmmu_ips ips)
+{
+	return sysmmu_states & (3 << (ips * 2));
+}
+
+static void __iomem *sysmmusfrs[S5P_SYSMMU_TOTAL_IPNUM];
+
+static inline void sysmmu_block(sysmmu_ips ips)
+{
+	__raw_writel(CTRL_BLOCK, sysmmusfrs[ips] + S5P_MMU_CTRL);
+	dev_dbg(dev, "%s is blocked.\n", sysmmu_ips_name[ips]);
+}
+
+static inline void sysmmu_unblock(sysmmu_ips ips)
+{
+	__raw_writel(CTRL_ENABLE, sysmmusfrs[ips] + S5P_MMU_CTRL);
+	dev_dbg(dev, "%s is unblocked.\n", sysmmu_ips_name[ips]);
+}
+
+static inline void __sysmmu_tlb_invalidate(sysmmu_ips ips)
+{
+	__raw_writel(0x1, sysmmusfrs[ips] + S5P_MMU_FLUSH);
+	dev_dbg(dev, "TLB of %s is invalidated.\n", sysmmu_ips_name[ips]);
+}
+
+static inline void __sysmmu_set_ptbase(sysmmu_ips ips, unsigned long pgd)
+{
+	if (unlikely(pgd == 0)) {
+		pgd = (unsigned long)ZERO_PAGE(0);
+		__raw_writel(0x20, sysmmusfrs[ips] + S5P_MMU_CFG); /* 4KB LV1 */
+	} else {
+		__raw_writel(0x0, sysmmusfrs[ips] + S5P_MMU_CFG); /* 16KB LV1 */
+	}
+
+	__raw_writel(pgd, sysmmusfrs[ips] + S5P_PT_BASE_ADDR);
+
+	dev_dbg(dev, "Page table base of %s is initialized with 0x%08lX.\n",
+						sysmmu_ips_name[ips], pgd);
+	__sysmmu_tlb_invalidate(ips);
+}
+
+void sysmmu_set_fault_handler(sysmmu_ips ips,
+			int (*handler)(enum S5P_SYSMMU_INTERRUPT_TYPE itype,
+					unsigned long pgtable_base,
+					unsigned long fault_addr))
+{
+	BUG_ON(!((ips >= SYSMMU_MDMA) && (ips < S5P_SYSMMU_TOTAL_IPNUM)));
+	fault_handlers[ips] = handler;
+}
+
+static irqreturn_t s5p_sysmmu_irq(int irq, void *dev_id)
+{
+	/* SYSMMU is in blocked when interrupt occurred. */
+	unsigned long base = 0;
+	sysmmu_ips ips = (sysmmu_ips)dev_id;
+	enum S5P_SYSMMU_INTERRUPT_TYPE itype;
+
+	itype = (enum S5P_SYSMMU_INTERRUPT_TYPE)
+		__ffs(__raw_readl(sysmmusfrs[ips] + S5P_INT_STATUS));
+
+	BUG_ON(!((itype >= 0) && (itype < 8)));
+
+	dev_alert(dev, "%s occurred by %s.\n", sysmmu_fault_name[itype],
+							sysmmu_ips_name[ips]);
+
+	if (fault_handlers[ips]) {
+		unsigned long addr;
+
+		base = __raw_readl(sysmmusfrs[ips] + S5P_PT_BASE_ADDR);
+		addr = __raw_readl(sysmmusfrs[ips] + fault_reg_offset[itype]);
+
+		if (fault_handlers[ips](itype, base, addr)) {
+			__raw_writel(1 << itype,
+					sysmmusfrs[ips] + S5P_INT_CLEAR);
+			dev_notice(dev, "%s from %s is resolved."
+					" Retrying translation.\n",
+				sysmmu_fault_name[itype], sysmmu_ips_name[ips]);
+		} else {
+			base = 0;
+		}
+	}
+
+	sysmmu_unblock(ips);
+
+	if (!base)
+		dev_notice(dev, "%s from %s is not handled.\n",
+			sysmmu_fault_name[itype], sysmmu_ips_name[ips]);
+
+	return IRQ_HANDLED;
+}
+
+void s5p_sysmmu_set_tablebase_pgd(sysmmu_ips ips, unsigned long pgd)
+{
+	if (is_sysmmu_active(ips)) {
+		sysmmu_block(ips);
+		__sysmmu_set_ptbase(ips, pgd);
+		sysmmu_unblock(ips);
+	} else {
+		dev_dbg(dev, "%s is disabled. "
+			"Skipping initializing page table base.\n",
+						sysmmu_ips_name[ips]);
+	}
+}
+
+void s5p_sysmmu_enable(sysmmu_ips ips, unsigned long pgd)
+{
+	if (!is_sysmmu_active(ips)) {
+		sysmmu_clk_enable(ips);
+
+		__sysmmu_set_ptbase(ips, pgd);
+
+		__raw_writel(CTRL_ENABLE, sysmmusfrs[ips] + S5P_MMU_CTRL);
+
+		set_sysmmu_active(ips);
+		dev_dbg(dev, "%s is enabled.\n", sysmmu_ips_name[ips]);
+	} else {
+		dev_dbg(dev, "%s is already enabled.\n", sysmmu_ips_name[ips]);
+	}
+}
+
+void s5p_sysmmu_disable(sysmmu_ips ips)
+{
+	if (is_sysmmu_active(ips)) {
+		__raw_writel(CTRL_DISABLE, sysmmusfrs[ips] + S5P_MMU_CTRL);
+		set_sysmmu_inactive(ips);
+		sysmmu_clk_disable(ips);
+		dev_dbg(dev, "%s is disabled.\n", sysmmu_ips_name[ips]);
+	} else {
+		dev_dbg(dev, "%s is already disabled.\n", sysmmu_ips_name[ips]);
+	}
+}
+
+void s5p_sysmmu_tlb_invalidate(sysmmu_ips ips)
+{
+	if (is_sysmmu_active(ips)) {
+		sysmmu_block(ips);
+		__sysmmu_tlb_invalidate(ips);
+		sysmmu_unblock(ips);
+	} else {
+		dev_dbg(dev, "%s is disabled. "
+			"Skipping invalidating TLB.\n", sysmmu_ips_name[ips]);
+	}
+}
+
+static int s5p_sysmmu_probe(struct platform_device *pdev)
+{
+	int i, ret;
+	struct resource *res, *mem;
+
+	dev = &pdev->dev;
+
+	for (i = 0; i < S5P_SYSMMU_TOTAL_IPNUM; i++) {
+		int irq;
+
+		sysmmu_clk_init(dev, i);
+		sysmmu_clk_disable(i);
+
+		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+		if (!res) {
+			dev_err(dev, "Failed to get the resource of %s.\n",
+							sysmmu_ips_name[i]);
+			ret = -ENODEV;
+			goto err_res;
+		}
+
+		mem = request_mem_region(res->start,
+				((res->end) - (res->start)) + 1, pdev->name);
+		if (!mem) {
+			dev_err(dev, "Failed to request the memory region of %s.\n",
+							sysmmu_ips_name[i]);
+			ret = -EBUSY;
+			goto err_res;
+		}
+
+		sysmmusfrs[i] = ioremap(res->start, res->end - res->start + 1);
+		if (!sysmmusfrs[i]) {
+			dev_err(dev, "Failed to ioremap() for %s.\n",
+							sysmmu_ips_name[i]);
+			ret = -ENXIO;
+			goto err_reg;
+		}
+
+		irq = platform_get_irq(pdev, i);
+		if (irq <= 0) {
+			dev_err(dev, "Failed to get the IRQ resource of %s.\n",
+							sysmmu_ips_name[i]);
+			ret = -ENOENT;
+			goto err_map;
+		}
+
+		if (request_irq(irq, s5p_sysmmu_irq, IRQF_DISABLED,
+						pdev->name, (void *)i)) {
+			dev_err(dev, "Failed to request IRQ for %s.\n",
+							sysmmu_ips_name[i]);
+			ret = -ENOENT;
+			goto err_map;
+		}
+	}
+
+	return 0;
+
+err_map:
+	iounmap(sysmmusfrs[i]);
+err_reg:
+	release_mem_region(mem->start, resource_size(mem));
+err_res:
+	return ret;
+}
+
+static int s5p_sysmmu_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+int s5p_sysmmu_runtime_suspend(struct device *dev)
+{
+	return 0;
+}
+
+int s5p_sysmmu_runtime_resume(struct device *dev)
+{
+	return 0;
+}
+
+const struct dev_pm_ops s5p_sysmmu_pm_ops = {
+	.runtime_suspend	= s5p_sysmmu_runtime_suspend,
+	.runtime_resume		= s5p_sysmmu_runtime_resume,
+};
+
+static struct platform_driver s5p_sysmmu_driver = {
+	.probe		= s5p_sysmmu_probe,
+	.remove		= s5p_sysmmu_remove,
+	.driver		= {
+		.owner		= THIS_MODULE,
+		.name		= "s5p-sysmmu",
+		.pm		= &s5p_sysmmu_pm_ops,
+	}
+};
+
+static int __init s5p_sysmmu_init(void)
+{
+	return platform_driver_register(&s5p_sysmmu_driver);
+}
+arch_initcall(s5p_sysmmu_init);