1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * linux/arch/arm/plat-omap/ocpi.c 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Minimal OCP bus support for omap16xx 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Copyright (C) 2003 - 2005 Nokia Corporation 8*4882a593Smuzhiyun * Copyright (C) 2012 Texas Instruments, Inc. 9*4882a593Smuzhiyun * Written by Tony Lindgren <tony@atomide.com> 10*4882a593Smuzhiyun * 11*4882a593Smuzhiyun * Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>. 12*4882a593Smuzhiyun */ 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun #include <linux/module.h> 15*4882a593Smuzhiyun #include <linux/types.h> 16*4882a593Smuzhiyun #include <linux/errno.h> 17*4882a593Smuzhiyun #include <linux/kernel.h> 18*4882a593Smuzhiyun #include <linux/init.h> 19*4882a593Smuzhiyun #include <linux/spinlock.h> 20*4882a593Smuzhiyun #include <linux/err.h> 21*4882a593Smuzhiyun #include <linux/clk.h> 22*4882a593Smuzhiyun #include <linux/io.h> 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun #include <mach/hardware.h> 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun #include "common.h" 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun #define OCPI_BASE 0xfffec320 29*4882a593Smuzhiyun #define OCPI_FAULT (OCPI_BASE + 0x00) 30*4882a593Smuzhiyun #define OCPI_CMD_FAULT (OCPI_BASE + 0x04) 31*4882a593Smuzhiyun #define OCPI_SINT0 (OCPI_BASE + 0x08) 32*4882a593Smuzhiyun #define OCPI_TABORT (OCPI_BASE + 0x0c) 33*4882a593Smuzhiyun #define OCPI_SINT1 (OCPI_BASE + 0x10) 34*4882a593Smuzhiyun #define OCPI_PROT (OCPI_BASE + 0x14) 35*4882a593Smuzhiyun #define OCPI_SEC (OCPI_BASE + 0x18) 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun /* USB OHCI OCPI access error registers */ 38*4882a593Smuzhiyun #define HOSTUEADDR 0xfffba0e0 39*4882a593Smuzhiyun #define HOSTUESTATUS 0xfffba0e4 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun static struct clk *ocpi_ck; 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun /* 44*4882a593Smuzhiyun * Enables device access to OMAP buses via the OCPI bridge 45*4882a593Smuzhiyun */ ocpi_enable(void)46*4882a593Smuzhiyunint ocpi_enable(void) 47*4882a593Smuzhiyun { 48*4882a593Smuzhiyun unsigned int val; 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun if (!cpu_is_omap16xx()) 51*4882a593Smuzhiyun return -ENODEV; 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun /* Enable access for OHCI in OCPI */ 54*4882a593Smuzhiyun val = omap_readl(OCPI_PROT); 55*4882a593Smuzhiyun val &= ~0xff; 56*4882a593Smuzhiyun /* val &= (1 << 0); Allow access only to EMIFS */ 57*4882a593Smuzhiyun omap_writel(val, OCPI_PROT); 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun val = omap_readl(OCPI_SEC); 60*4882a593Smuzhiyun val &= ~0xff; 61*4882a593Smuzhiyun omap_writel(val, OCPI_SEC); 62*4882a593Smuzhiyun 63*4882a593Smuzhiyun return 0; 64*4882a593Smuzhiyun } 65*4882a593Smuzhiyun EXPORT_SYMBOL(ocpi_enable); 66*4882a593Smuzhiyun omap_ocpi_init(void)67*4882a593Smuzhiyunstatic int __init omap_ocpi_init(void) 68*4882a593Smuzhiyun { 69*4882a593Smuzhiyun if (!cpu_is_omap16xx()) 70*4882a593Smuzhiyun return -ENODEV; 71*4882a593Smuzhiyun 72*4882a593Smuzhiyun ocpi_ck = clk_get(NULL, "l3_ocpi_ck"); 73*4882a593Smuzhiyun if (IS_ERR(ocpi_ck)) 74*4882a593Smuzhiyun return PTR_ERR(ocpi_ck); 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun clk_enable(ocpi_ck); 77*4882a593Smuzhiyun ocpi_enable(); 78*4882a593Smuzhiyun pr_info("OMAP OCPI interconnect driver loaded\n"); 79*4882a593Smuzhiyun 80*4882a593Smuzhiyun return 0; 81*4882a593Smuzhiyun } 82*4882a593Smuzhiyun omap_ocpi_exit(void)83*4882a593Smuzhiyunstatic void __exit omap_ocpi_exit(void) 84*4882a593Smuzhiyun { 85*4882a593Smuzhiyun /* REVISIT: Disable OCPI */ 86*4882a593Smuzhiyun 87*4882a593Smuzhiyun if (!cpu_is_omap16xx()) 88*4882a593Smuzhiyun return; 89*4882a593Smuzhiyun 90*4882a593Smuzhiyun clk_disable(ocpi_ck); 91*4882a593Smuzhiyun clk_put(ocpi_ck); 92*4882a593Smuzhiyun } 93*4882a593Smuzhiyun 94*4882a593Smuzhiyun MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); 95*4882a593Smuzhiyun MODULE_DESCRIPTION("OMAP OCPI bus controller module"); 96*4882a593Smuzhiyun MODULE_LICENSE("GPL"); 97*4882a593Smuzhiyun module_init(omap_ocpi_init); 98*4882a593Smuzhiyun module_exit(omap_ocpi_exit); 99