a10_twsi.c revision 302408
1/*- 2 * Copyright (c) 2016 Emmanuel Vadot <manu@bidouilliste.com> 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/11/sys/dev/iicbus/twsi/a10_twsi.c 300777 2016-05-26 21:09:07Z manu $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/bus.h> 33#include <sys/kernel.h> 34#include <sys/module.h> 35#include <sys/resource.h> 36 37#include <machine/bus.h> 38#include <machine/resource.h> 39 40#include <sys/rman.h> 41 42#include <sys/lock.h> 43#include <sys/mutex.h> 44 45#include <dev/iicbus/iiconf.h> 46#include <dev/iicbus/iicbus.h> 47#include <dev/iicbus/twsi/twsi.h> 48#include <dev/ofw/ofw_bus.h> 49#include <dev/ofw/ofw_bus_subr.h> 50 51#include <dev/extres/clk/clk.h> 52#include <dev/extres/hwreset/hwreset.h> 53 54#include "iicbus_if.h" 55 56#define TWI_ADDR 0x0 57#define TWI_XADDR 0x4 58#define TWI_DATA 0x8 59#define TWI_CNTR 0xC 60#define TWI_STAT 0x10 61#define TWI_CCR 0x14 62#define TWI_SRST 0x18 63#define TWI_EFR 0x1C 64#define TWI_LCR 0x20 65 66static struct ofw_compat_data compat_data[] = { 67 {"allwinner,sun4i-a10-i2c", 1}, 68 {"allwinner,sun6i-a31-i2c", 1}, 69 {"allwinner,sun8i-a83t-i2c", 1}, 70 {NULL, 0}, 71}; 72 73static int 74a10_twsi_probe(device_t dev) 75{ 76 77 if (!ofw_bus_status_okay(dev)) 78 return (ENXIO); 79 80 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 81 return (ENXIO); 82 83 device_set_desc(dev, "Allwinner Integrated I2C Bus Controller"); 84 return (BUS_PROBE_DEFAULT); 85} 86 87static int 88a10_twsi_attach(device_t dev) 89{ 90 struct twsi_softc *sc; 91 clk_t clk; 92 hwreset_t rst; 93 int error; 94 95 sc = device_get_softc(dev); 96 97 /* De-assert reset */ 98 if (hwreset_get_by_ofw_idx(dev, 0, &rst) == 0) { 99 error = hwreset_deassert(rst); 100 if (error != 0) { 101 device_printf(dev, "could not de-assert reset\n"); 102 return (error); 103 } 104 } 105 106 /* Activate clock */ 107 error = clk_get_by_ofw_index(dev, 0, &clk); 108 if (error != 0) { 109 device_printf(dev, "could not find clock\n"); 110 return (error); 111 } 112 error = clk_enable(clk); 113 if (error != 0) { 114 device_printf(dev, "could not enable clock\n"); 115 return (error); 116 } 117 118 sc->reg_data = TWI_DATA; 119 sc->reg_slave_addr = TWI_ADDR; 120 sc->reg_slave_ext_addr = TWI_XADDR; 121 sc->reg_control = TWI_CNTR; 122 sc->reg_status = TWI_STAT; 123 sc->reg_baud_rate = TWI_CCR; 124 sc->reg_soft_reset = TWI_SRST; 125 126 /* Setup baud rate params */ 127 sc->baud_rate[IIC_SLOW].param = TWSI_BAUD_RATE_PARAM(11, 2); 128 sc->baud_rate[IIC_FAST].param = TWSI_BAUD_RATE_PARAM(11, 2); 129 sc->baud_rate[IIC_FASTEST].param = TWSI_BAUD_RATE_PARAM(2, 2); 130 131 return (twsi_attach(dev)); 132} 133 134static phandle_t 135a10_twsi_get_node(device_t bus, device_t dev) 136{ 137 return (ofw_bus_get_node(bus)); 138} 139 140static device_method_t a10_twsi_methods[] = { 141 /* device interface */ 142 DEVMETHOD(device_probe, a10_twsi_probe), 143 DEVMETHOD(device_attach, a10_twsi_attach), 144 145 /* OFW methods */ 146 DEVMETHOD(ofw_bus_get_node, a10_twsi_get_node), 147 148 { 0, 0 } 149}; 150 151DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods, 152 sizeof(struct twsi_softc), twsi_driver); 153 154static devclass_t a10_twsi_devclass; 155 156EARLY_DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, a10_twsi_devclass, 157 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 158EARLY_DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, iicbus_devclass, 159 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 160MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1); 161