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 42#include <dev/fdt/fdt_common.h> 43#include <dev/ofw/ofw_bus.h> 44#include <dev/ofw/ofw_bus_subr.h> 45 46#include <dev/uart/uart.h> 47#include <dev/uart/uart_cpu.h> 48#include <dev/uart/uart_cpu_fdt.h> 49#include <dev/uart/uart_bus.h> 50#include <dev/uart/uart_dev_ns8250.h> 51 52#include "uart_if.h" 53 54/* 55 * High-level UART interface. 56 */ 57struct ti8250_softc { 58 struct ns8250_softc ns8250_base; 59 /*uint32_t mystuff;*/ 60}; 61 62#define MDR1_REG 8 63#define MDR1_MODE_UART 0 64#define MDR1_MODE_DISABLE 7 65#define SYSCC_REG 15 66#define SYSCC_SOFTRESET (1 << 1) 67#define SYSS_REG 16 68#define SYSS_STATUS_RESETDONE (1 << 0) 69 70static int 71ti8250_bus_probe(struct uart_softc *sc) 72{ 73 int status; 74 int devid; 75 clk_ident_t clkid; 76 pcell_t prop; 77 phandle_t node; 78 79 /* 80 * Get the device id from FDT. If it's not there we can't turn on the 81 * right clocks, so bail, unless we're doing unit 0. We assume that's 82 * the serial console, whose clock isn't controllable anyway, and we 83 * sure don't want to break the console because of a config error. 84 */ 85 node = ofw_bus_get_node(sc->sc_dev); 86 if ((OF_getprop(node, "uart-device-id", &prop, sizeof(prop))) <= 0) { 87 device_printf(sc->sc_dev, 88 "missing uart-device-id attribute in FDT\n"); 89 if (device_get_unit(sc->sc_dev) != 0) 90 return (ENXIO); 91 devid = 0; 92 } else 93 devid = fdt32_to_cpu(prop); 94 95 /* Enable clocks for this device. We can't continue if that fails. */ 96 clkid = UART0_CLK + devid; 97 if ((status = ti_prcm_clk_enable(clkid)) != 0) 98 return (status); 99 100 /* 101 * Set the hardware to disabled mode, do a full device reset, then set 102 * it to uart mode. Most devices will be reset-and-disabled already, 103 * but you never know what a bootloader might have done. 104 */ 105 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE); 106 uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET); 107 while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE) 108 continue; 109 uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART); 110 111 status = ns8250_bus_probe(sc); 112 if (status == 0) 113 device_set_desc(sc->sc_dev, "TI UART (16550 compatible)"); 114 115 return (status); 116} 117 118static kobj_method_t ti8250_methods[] = { 119 KOBJMETHOD(uart_probe, ti8250_bus_probe), 120 121 KOBJMETHOD(uart_attach, ns8250_bus_attach), 122 KOBJMETHOD(uart_detach, ns8250_bus_detach), 123 KOBJMETHOD(uart_flush, ns8250_bus_flush), 124 KOBJMETHOD(uart_getsig, ns8250_bus_getsig), 125 KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl), 126 KOBJMETHOD(uart_ipend, ns8250_bus_ipend), 127 KOBJMETHOD(uart_param, ns8250_bus_param), 128 KOBJMETHOD(uart_receive, ns8250_bus_receive), 129 KOBJMETHOD(uart_setsig, ns8250_bus_setsig), 130 KOBJMETHOD(uart_transmit, ns8250_bus_transmit), 131 KOBJMETHOD_END 132}; 133 134static struct uart_class uart_ti8250_class = { 135 "ti8250", 136 ti8250_methods, 137 sizeof(struct ti8250_softc), 138 .uc_ops = &uart_ns8250_ops, 139 .uc_range = 0x88, 140 .uc_rclk = 48000000 141}; 142static struct ofw_compat_data compat_data[] = { 143 {"ti,ns16550", (uintptr_t)&uart_ti8250_class}, 144 {NULL, (uintptr_t)NULL}, 145}; 146UART_FDT_CLASS_AND_DEVICE(compat_data); 147