1 /*- 2 * Copyright (c) 2016-2019 Emmanuel Vadot <manu@freebsd.org> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/param.h> 27 #include <sys/systm.h> 28 #include <sys/bus.h> 29 #include <sys/kernel.h> 30 #include <sys/module.h> 31 #include <sys/resource.h> 32 33 #include <machine/bus.h> 34 #include <machine/resource.h> 35 36 #include <sys/rman.h> 37 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 41 #include <dev/iicbus/iiconf.h> 42 #include <dev/iicbus/iicbus.h> 43 #include <dev/iicbus/controller/twsi/twsi.h> 44 #include <dev/ofw/ofw_bus.h> 45 #include <dev/ofw/ofw_bus_subr.h> 46 47 #include <dev/clk/clk.h> 48 #include <dev/hwreset/hwreset.h> 49 50 #include "iicbus_if.h" 51 52 #define TWI_ADDR 0x0 53 #define TWI_XADDR 0x4 54 #define TWI_DATA 0x8 55 #define TWI_CNTR 0xC 56 #define TWI_STAT 0x10 57 #define TWI_CCR 0x14 58 #define TWI_SRST 0x18 59 #define TWI_EFR 0x1C 60 #define TWI_LCR 0x20 61 62 static struct ofw_compat_data compat_data[] = { 63 {"allwinner,sun4i-a10-i2c", 1}, 64 {"allwinner,sun6i-a31-i2c", 1}, 65 {"allwinner,sun8i-a83t-i2c", 1}, 66 {NULL, 0}, 67 }; 68 69 static int 70 a10_twsi_probe(device_t dev) 71 { 72 73 if (!ofw_bus_status_okay(dev)) 74 return (ENXIO); 75 76 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 77 return (ENXIO); 78 79 device_set_desc(dev, "Allwinner Integrated I2C Bus Controller"); 80 return (BUS_PROBE_DEFAULT); 81 } 82 83 static int 84 a10_twsi_attach(device_t dev) 85 { 86 struct twsi_softc *sc; 87 hwreset_t rst; 88 int error; 89 90 sc = device_get_softc(dev); 91 92 /* De-assert reset */ 93 if (hwreset_get_by_ofw_idx(dev, 0, 0, &rst) == 0) { 94 error = hwreset_deassert(rst); 95 if (error != 0) { 96 device_printf(dev, "could not de-assert reset\n"); 97 return (error); 98 } 99 } 100 101 /* Activate clock */ 102 error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk_core); 103 if (error != 0) { 104 device_printf(dev, "could not find clock\n"); 105 return (error); 106 } 107 error = clk_enable(sc->clk_core); 108 if (error != 0) { 109 device_printf(dev, "could not enable clock\n"); 110 return (error); 111 } 112 113 sc->reg_data = TWI_DATA; 114 sc->reg_slave_addr = TWI_ADDR; 115 sc->reg_slave_ext_addr = TWI_XADDR; 116 sc->reg_control = TWI_CNTR; 117 sc->reg_status = TWI_STAT; 118 sc->reg_baud_rate = TWI_CCR; 119 sc->reg_soft_reset = TWI_SRST; 120 121 if (ofw_bus_is_compatible(dev, "allwinner,sun6i-a31-i2c") || 122 ofw_bus_is_compatible(dev, "allwinner,sun6i-a83t-i2c")) 123 sc->iflag_w1c = true; 124 return (twsi_attach(dev)); 125 } 126 127 static phandle_t 128 a10_twsi_get_node(device_t bus, device_t dev) 129 { 130 return (ofw_bus_get_node(bus)); 131 } 132 133 static device_method_t a10_twsi_methods[] = { 134 /* device interface */ 135 DEVMETHOD(device_probe, a10_twsi_probe), 136 DEVMETHOD(device_attach, a10_twsi_attach), 137 138 /* OFW methods */ 139 DEVMETHOD(ofw_bus_get_node, a10_twsi_get_node), 140 141 { 0, 0 } 142 }; 143 144 DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods, 145 sizeof(struct twsi_softc), twsi_driver); 146 147 EARLY_DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, 148 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE); 149 EARLY_DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, 150 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE); 151 MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1); 152 SIMPLEBUS_PNP_INFO(compat_data); 153