1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * linux/arch/arm/plat-omap/ocpi.c 4 * 5 * Minimal OCP bus support for omap16xx 6 * 7 * Copyright (C) 2003 - 2005 Nokia Corporation 8 * Copyright (C) 2012 Texas Instruments, Inc. 9 * Written by Tony Lindgren <tony@atomide.com> 10 * 11 * Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/types.h> 16 #include <linux/errno.h> 17 #include <linux/kernel.h> 18 #include <linux/init.h> 19 #include <linux/spinlock.h> 20 #include <linux/err.h> 21 #include <linux/clk.h> 22 #include <linux/io.h> 23 24 #include <mach/hardware.h> 25 26 #include "common.h" 27 28 #define OCPI_BASE 0xfffec320 29 #define OCPI_FAULT (OCPI_BASE + 0x00) 30 #define OCPI_CMD_FAULT (OCPI_BASE + 0x04) 31 #define OCPI_SINT0 (OCPI_BASE + 0x08) 32 #define OCPI_TABORT (OCPI_BASE + 0x0c) 33 #define OCPI_SINT1 (OCPI_BASE + 0x10) 34 #define OCPI_PROT (OCPI_BASE + 0x14) 35 #define OCPI_SEC (OCPI_BASE + 0x18) 36 37 /* USB OHCI OCPI access error registers */ 38 #define HOSTUEADDR 0xfffba0e0 39 #define HOSTUESTATUS 0xfffba0e4 40 41 static struct clk *ocpi_ck; 42 43 /* 44 * Enables device access to OMAP buses via the OCPI bridge 45 */ 46 int ocpi_enable(void) 47 { 48 unsigned int val; 49 50 if (!cpu_is_omap16xx()) 51 return -ENODEV; 52 53 /* Enable access for OHCI in OCPI */ 54 val = omap_readl(OCPI_PROT); 55 val &= ~0xff; 56 /* val &= (1 << 0); Allow access only to EMIFS */ 57 omap_writel(val, OCPI_PROT); 58 59 val = omap_readl(OCPI_SEC); 60 val &= ~0xff; 61 omap_writel(val, OCPI_SEC); 62 63 return 0; 64 } 65 EXPORT_SYMBOL(ocpi_enable); 66 67 static int __init omap_ocpi_init(void) 68 { 69 if (!cpu_is_omap16xx()) 70 return -ENODEV; 71 72 ocpi_ck = clk_get(NULL, "l3_ocpi_ck"); 73 if (IS_ERR(ocpi_ck)) 74 return PTR_ERR(ocpi_ck); 75 76 clk_enable(ocpi_ck); 77 ocpi_enable(); 78 pr_info("OMAP OCPI interconnect driver loaded\n"); 79 80 return 0; 81 } 82 83 static void __exit omap_ocpi_exit(void) 84 { 85 /* REVISIT: Disable OCPI */ 86 87 if (!cpu_is_omap16xx()) 88 return; 89 90 clk_disable(ocpi_ck); 91 clk_put(ocpi_ck); 92 } 93 94 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); 95 MODULE_DESCRIPTION("OMAP OCPI bus controller module"); 96 MODULE_LICENSE("GPL"); 97 module_init(omap_ocpi_init); 98 module_exit(omap_ocpi_exit); 99