[ARM] orion5x: add sram support for crypto

The security accelerator which can act as a puppet player for the crypto
engine requires its commands in the sram. This patch adds support for the
phys mapping and creates a platform device for the actual driver.

[ nico: renamed device name from "mv,orion5x-crypto" to "mv_crypto"
  so to match the module name and be more generic for Kirkwood use ]

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Signed-off-by: Nicolas Pitre <nico@marvell.com>

arch/arm/mach-orion5x/addr-map.c

@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/mbus.h>
 #include <linux/io.h>
+#include <linux/errno.h>
 #include <mach/hardware.h>
 #include "common.h"
 
@@ -44,6 +45,7 @@
 #define TARGET_DEV_BUS		1
 #define TARGET_PCI		3
 #define TARGET_PCIE		4
+#define TARGET_SRAM		9
 #define ATTR_PCIE_MEM		0x59
 #define ATTR_PCIE_IO		0x51
 #define ATTR_PCIE_WA		0x79
@@ -53,6 +55,7 @@
 #define ATTR_DEV_CS1		0x1d
 #define ATTR_DEV_CS2		0x1b
 #define ATTR_DEV_BOOT		0xf
+#define ATTR_SRAM		0x0
 
 /*
  * Helpers to get DDR bank info
@@ -87,13 +90,13 @@ static int __init orion5x_cpu_win_can_remap(int win)
 	return 0;
 }
 
-static void __init setup_cpu_win(int win, u32 base, u32 size,
+static int __init setup_cpu_win(int win, u32 base, u32 size,
 				 u8 target, u8 attr, int remap)
 {
 	if (win >= 8) {
 		printk(KERN_ERR "setup_cpu_win: trying to allocate "
 				"window %d\n", win);
-		return;
+		return -ENOSPC;
 	}
 
 	writel(base & 0xffff0000, CPU_WIN_BASE(win));
@@ -107,6 +110,7 @@ static void __init setup_cpu_win(int win, u32 base, u32 size,
 		writel(remap & 0xffff0000, CPU_WIN_REMAP_LO(win));
 		writel(0, CPU_WIN_REMAP_HI(win));
 	}
+	return 0;
 }
 
 void __init orion5x_setup_cpu_mbus_bridge(void)
@@ -193,3 +197,9 @@ void __init orion5x_setup_pcie_wa_win(u32 base, u32 size)
 	setup_cpu_win(win_alloc_count++, base, size,
 		      TARGET_PCIE, ATTR_PCIE_WA, -1);
 }
+
+int __init orion5x_setup_sram_win(void)
+{
+	return setup_cpu_win(win_alloc_count, ORION5X_SRAM_PHYS_BASE,
+			ORION5X_SRAM_SIZE, TARGET_SRAM, ATTR_SRAM, -1);
+}

arch/arm/mach-orion5x/common.c

@@ -536,6 +536,42 @@ void __init orion5x_xor_init(void)
 	platform_device_register(&orion5x_xor1_channel);
 }
 
+static struct resource orion5x_crypto_res[] = {
+	{
+		.name   = "regs",
+		.start  = ORION5X_CRYPTO_PHYS_BASE,
+		.end    = ORION5X_CRYPTO_PHYS_BASE + 0xffff,
+		.flags  = IORESOURCE_MEM,
+	}, {
+		.name   = "sram",
+		.start  = ORION5X_SRAM_PHYS_BASE,
+		.end    = ORION5X_SRAM_PHYS_BASE + SZ_8K - 1,
+		.flags  = IORESOURCE_MEM,
+	}, {
+		.name   = "crypto interrupt",
+		.start  = IRQ_ORION5X_CESA,
+		.end    = IRQ_ORION5X_CESA,
+		.flags  = IORESOURCE_IRQ,
+	},
+};
+
+static struct platform_device orion5x_crypto_device = {
+	.name           = "mv_crypto",
+	.id             = -1,
+	.num_resources  = ARRAY_SIZE(orion5x_crypto_res),
+	.resource       = orion5x_crypto_res,
+};
+
+int __init orion5x_crypto_init(void)
+{
+	int ret;
+
+	ret = orion5x_setup_sram_win();
+	if (ret)
+		return ret;
+
+	return platform_device_register(&orion5x_crypto_device);
+}
 
 /*****************************************************************************
  * Watchdog

arch/arm/mach-orion5x/common.h

@@ -26,6 +26,7 @@ void orion5x_setup_dev0_win(u32 base, u32 size);
 void orion5x_setup_dev1_win(u32 base, u32 size);
 void orion5x_setup_dev2_win(u32 base, u32 size);
 void orion5x_setup_pcie_wa_win(u32 base, u32 size);
+int orion5x_setup_sram_win(void);
 
 void orion5x_ehci0_init(void);
 void orion5x_ehci1_init(void);
@@ -37,6 +38,7 @@ void orion5x_spi_init(void);
 void orion5x_uart0_init(void);
 void orion5x_uart1_init(void);
 void orion5x_xor_init(void);
+int orion5x_crypto_init(void);
 
 /*
  * PCIe/PCI functions.

arch/arm/mach-orion5x/include/mach/orion5x.h

@@ -24,6 +24,7 @@
  * f1000000	on-chip peripheral registers
  * f2000000	PCIe I/O space
  * f2100000	PCI I/O space
+ * f2200000	SRAM dedicated for the crypto unit
  * f4000000	device bus mappings (boot)
  * fa000000	device bus mappings (cs0)
  * fa800000	device bus mappings (cs2)
@@ -49,6 +50,9 @@
 #define ORION5X_PCI_IO_BUS_BASE		0x00100000
 #define ORION5X_PCI_IO_SIZE		SZ_1M
 
+#define ORION5X_SRAM_PHYS_BASE		(0xf2200000)
+#define ORION5X_SRAM_SIZE		SZ_8K
+
 /* Relevant only for Orion-1/Orion-NAS */
 #define ORION5X_PCIE_WA_PHYS_BASE	0xf0000000
 #define ORION5X_PCIE_WA_VIRT_BASE	0xfe000000
@@ -94,6 +98,8 @@
 #define ORION5X_SATA_PHYS_BASE		(ORION5X_REGS_PHYS_BASE | 0x80000)
 #define ORION5X_SATA_VIRT_BASE		(ORION5X_REGS_VIRT_BASE | 0x80000)
 
+#define ORION5X_CRYPTO_PHYS_BASE	(ORION5X_REGS_PHYS_BASE | 0x90000)
+
 #define ORION5X_USB1_PHYS_BASE		(ORION5X_REGS_PHYS_BASE | 0xa0000)
 #define ORION5X_USB1_VIRT_BASE		(ORION5X_REGS_VIRT_BASE | 0xa0000)