11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 26f3c1af2SPaul Walmsley /* 36f3c1af2SPaul Walmsley * linux/arch/arm/plat-omap/ocpi.c 46f3c1af2SPaul Walmsley * 56f3c1af2SPaul Walmsley * Minimal OCP bus support for omap16xx 66f3c1af2SPaul Walmsley * 76f3c1af2SPaul Walmsley * Copyright (C) 2003 - 2005 Nokia Corporation 86f3c1af2SPaul Walmsley * Copyright (C) 2012 Texas Instruments, Inc. 96f3c1af2SPaul Walmsley * Written by Tony Lindgren <tony@atomide.com> 106f3c1af2SPaul Walmsley * 116f3c1af2SPaul Walmsley * Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>. 126f3c1af2SPaul Walmsley */ 136f3c1af2SPaul Walmsley 146f3c1af2SPaul Walmsley #include <linux/module.h> 156f3c1af2SPaul Walmsley #include <linux/types.h> 166f3c1af2SPaul Walmsley #include <linux/errno.h> 176f3c1af2SPaul Walmsley #include <linux/kernel.h> 186f3c1af2SPaul Walmsley #include <linux/init.h> 196f3c1af2SPaul Walmsley #include <linux/spinlock.h> 206f3c1af2SPaul Walmsley #include <linux/err.h> 216f3c1af2SPaul Walmsley #include <linux/clk.h> 226f3c1af2SPaul Walmsley #include <linux/io.h> 23*7e0a9e62SArnd Bergmann #include <linux/soc/ti/omap1-io.h> 246f3c1af2SPaul Walmsley 25*7e0a9e62SArnd Bergmann #include "hardware.h" 266f3c1af2SPaul Walmsley #include "common.h" 276f3c1af2SPaul Walmsley 286f3c1af2SPaul Walmsley #define OCPI_BASE 0xfffec320 296f3c1af2SPaul Walmsley #define OCPI_FAULT (OCPI_BASE + 0x00) 306f3c1af2SPaul Walmsley #define OCPI_CMD_FAULT (OCPI_BASE + 0x04) 316f3c1af2SPaul Walmsley #define OCPI_SINT0 (OCPI_BASE + 0x08) 326f3c1af2SPaul Walmsley #define OCPI_TABORT (OCPI_BASE + 0x0c) 336f3c1af2SPaul Walmsley #define OCPI_SINT1 (OCPI_BASE + 0x10) 346f3c1af2SPaul Walmsley #define OCPI_PROT (OCPI_BASE + 0x14) 356f3c1af2SPaul Walmsley #define OCPI_SEC (OCPI_BASE + 0x18) 366f3c1af2SPaul Walmsley 376f3c1af2SPaul Walmsley /* USB OHCI OCPI access error registers */ 386f3c1af2SPaul Walmsley #define HOSTUEADDR 0xfffba0e0 396f3c1af2SPaul Walmsley #define HOSTUESTATUS 0xfffba0e4 406f3c1af2SPaul Walmsley 416f3c1af2SPaul Walmsley static struct clk *ocpi_ck; 426f3c1af2SPaul Walmsley 436f3c1af2SPaul Walmsley /* 446f3c1af2SPaul Walmsley * Enables device access to OMAP buses via the OCPI bridge 456f3c1af2SPaul Walmsley */ 466f3c1af2SPaul Walmsley int ocpi_enable(void) 476f3c1af2SPaul Walmsley { 486f3c1af2SPaul Walmsley unsigned int val; 496f3c1af2SPaul Walmsley 506f3c1af2SPaul Walmsley if (!cpu_is_omap16xx()) 516f3c1af2SPaul Walmsley return -ENODEV; 526f3c1af2SPaul Walmsley 536f3c1af2SPaul Walmsley /* Enable access for OHCI in OCPI */ 546f3c1af2SPaul Walmsley val = omap_readl(OCPI_PROT); 556f3c1af2SPaul Walmsley val &= ~0xff; 566f3c1af2SPaul Walmsley /* val &= (1 << 0); Allow access only to EMIFS */ 576f3c1af2SPaul Walmsley omap_writel(val, OCPI_PROT); 586f3c1af2SPaul Walmsley 596f3c1af2SPaul Walmsley val = omap_readl(OCPI_SEC); 606f3c1af2SPaul Walmsley val &= ~0xff; 616f3c1af2SPaul Walmsley omap_writel(val, OCPI_SEC); 626f3c1af2SPaul Walmsley 636f3c1af2SPaul Walmsley return 0; 646f3c1af2SPaul Walmsley } 656f3c1af2SPaul Walmsley EXPORT_SYMBOL(ocpi_enable); 666f3c1af2SPaul Walmsley 676f3c1af2SPaul Walmsley static int __init omap_ocpi_init(void) 686f3c1af2SPaul Walmsley { 696f3c1af2SPaul Walmsley if (!cpu_is_omap16xx()) 706f3c1af2SPaul Walmsley return -ENODEV; 716f3c1af2SPaul Walmsley 726f3c1af2SPaul Walmsley ocpi_ck = clk_get(NULL, "l3_ocpi_ck"); 736f3c1af2SPaul Walmsley if (IS_ERR(ocpi_ck)) 746f3c1af2SPaul Walmsley return PTR_ERR(ocpi_ck); 756f3c1af2SPaul Walmsley 766f3c1af2SPaul Walmsley clk_enable(ocpi_ck); 776f3c1af2SPaul Walmsley ocpi_enable(); 786f3c1af2SPaul Walmsley pr_info("OMAP OCPI interconnect driver loaded\n"); 796f3c1af2SPaul Walmsley 806f3c1af2SPaul Walmsley return 0; 816f3c1af2SPaul Walmsley } 826f3c1af2SPaul Walmsley 836f3c1af2SPaul Walmsley static void __exit omap_ocpi_exit(void) 846f3c1af2SPaul Walmsley { 856f3c1af2SPaul Walmsley /* REVISIT: Disable OCPI */ 866f3c1af2SPaul Walmsley 876f3c1af2SPaul Walmsley if (!cpu_is_omap16xx()) 886f3c1af2SPaul Walmsley return; 896f3c1af2SPaul Walmsley 906f3c1af2SPaul Walmsley clk_disable(ocpi_ck); 916f3c1af2SPaul Walmsley clk_put(ocpi_ck); 926f3c1af2SPaul Walmsley } 936f3c1af2SPaul Walmsley 946f3c1af2SPaul Walmsley MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); 956f3c1af2SPaul Walmsley MODULE_DESCRIPTION("OMAP OCPI bus controller module"); 966f3c1af2SPaul Walmsley MODULE_LICENSE("GPL"); 976f3c1af2SPaul Walmsley module_init(omap_ocpi_init); 986f3c1af2SPaul Walmsley module_exit(omap_ocpi_exit); 99