1/*- 2 * Copyright (c) 2013 Ian Lepore 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include "opt_platform.h" 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/bus.h> 35#include <sys/conf.h> 36#include <sys/kernel.h> 37#include <sys/sysctl.h> 38#include <machine/bus.h> 39 40#include <arm/ti/ti_prcm.h> 41#include <arm/ti/ti_hwmods.h> 42 43#include <dev/fdt/fdt_common.h> 44#include <dev/ofw/ofw_bus.h> 45#include <dev/ofw/ofw_bus_subr.h> 46 47#include <dev/uart/uart.h> 48#include <dev/uart/uart_cpu.h> 49#include <dev/uart/uart_cpu_fdt.h> 50#include <dev/uart/uart_bus.h> 51#include <dev/uart/uart_dev_ns8250.h> 52 53#include "uart_if.h" 54 55/* 56 * High-level UART interface. 57 */ 58struct ti8250_softc { 59 struct ns8250_softc ns8250_base; 60 /*uint32_t mystuff;*/ 61}; 62 63#define MDR1_REG 8 64#define MDR1_MODE_UART 0 65#define MDR1_MODE_DISABLE 7 66#define SYSCC_REG 15 67#define SYSCC_SOFTRESET (1 << 1) 68#define SYSS_REG 16 69#define SYSS_STATUS_RESETDONE (1 << 0) 70 71static int 72ti8250_bus_probe(struct uart_softc *sc) 73{ 74 int status; 75 clk_ident_t clkid; 76 77 /* Enable clocks for this device. We can't continue if that fails. */ 78 clkid = ti_hwmods_get_clock(sc->sc_dev); 79 if (clkid == INVALID_CLK_IDENT) { 80 device_printf(sc->sc_dev, 81 "failed to get clock based on hwmods\n"); 82 clkid = UART1_CLK + device_get_unit(sc->sc_dev); 83 } 84 if ((status = ti_prcm_clk_enable(clkid)) != 0) 85 return (status); 86 87 /* 88 * Set the hardware to disabled mode, do a full device reset, then set 89 * it to uart mode. Most devices will be reset-and-disabled already, 90 * but you never know what a bootloader might have done. 91 */ 92 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE); 93 uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET); 94 while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE) 95 continue; 96 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART); 97 98 status = ns8250_bus_probe(sc); 99 if (status == 0) 100 device_set_desc(sc->sc_dev, "TI UART (16550 compatible)"); 101 102 return (status); 103} 104 105static kobj_method_t ti8250_methods[] = { 106 KOBJMETHOD(uart_probe, ti8250_bus_probe), 107 108 KOBJMETHOD(uart_attach, ns8250_bus_attach), 109 KOBJMETHOD(uart_detach, ns8250_bus_detach), 110 KOBJMETHOD(uart_flush, ns8250_bus_flush), 111 KOBJMETHOD(uart_getsig, ns8250_bus_getsig), 112 KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl), 113 KOBJMETHOD(uart_ipend, ns8250_bus_ipend), 114 KOBJMETHOD(uart_param, ns8250_bus_param), 115 KOBJMETHOD(uart_receive, ns8250_bus_receive), 116 KOBJMETHOD(uart_setsig, ns8250_bus_setsig), 117 KOBJMETHOD(uart_transmit, ns8250_bus_transmit), 118 KOBJMETHOD_END 119}; 120 121static struct uart_class uart_ti8250_class = { 122 "ti8250", 123 ti8250_methods, 124 sizeof(struct ti8250_softc), 125 .uc_ops = &uart_ns8250_ops, 126 .uc_range = 0x88, 127 .uc_rclk = 48000000, 128 .uc_rshift = 2 129}; 130static struct ofw_compat_data compat_data[] = { 131 {"ti,ns16550", (uintptr_t)&uart_ti8250_class}, 132 {"ti,omap3-uart", (uintptr_t)&uart_ti8250_class}, 133 {"ti,omap4-uart", (uintptr_t)&uart_ti8250_class}, 134 {NULL, (uintptr_t)NULL}, 135}; 136UART_FDT_CLASS_AND_DEVICE(compat_data); 137