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136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
/* $NetBSD: imxi2c.c,v 1.2 2015/03/27 05:31:23 hkenken Exp $ */
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/*
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* Copyright (c) 2012, 2015 Genetec Corporation. All rights reserved.
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* Written by Hashimoto Kenichi for Genetec Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: imxi2c.c,v 1.2 2015/03/27 05:31:23 hkenken Exp $");
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#include "opt_imx.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/device.h>
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#include <dev/i2c/motoi2cvar.h>
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#include <dev/i2c/motoi2creg.h>
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#include <arm/imx/imxi2cvar.h>
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struct clk_div {
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uint8_t ic_val;
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int div;
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};
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static const struct clk_div imxi2c_clk_div[] = {
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{0x20, 22}, {0x21, 24}, {0x22, 26}, {0x23, 28},
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{0x00, 30}, {0x01, 32}, {0x24, 32}, {0x02, 36},
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{0x25, 36}, {0x26, 40}, {0x03, 42}, {0x27, 44},
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{0x04, 48}, {0x28, 48}, {0x05, 52}, {0x29, 56},
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{0x06, 60}, {0x2A, 64}, {0x07, 72}, {0x2B, 72},
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{0x08, 80}, {0x2C, 80}, {0x09, 88}, {0x2D, 96},
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{0x0A, 104}, {0x2E, 112}, {0x0B, 128}, {0x2F, 128},
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{0x0C, 144}, {0x0D, 160}, {0x30, 160}, {0x0E, 192},
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{0x31, 192}, {0x32, 224}, {0x0F, 240}, {0x33, 256},
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{0x10, 288}, {0x11, 320}, {0x34, 320}, {0x12, 384},
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{0x35, 384}, {0x36, 448}, {0x13, 480}, {0x37, 512},
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{0x14, 576}, {0x15, 640}, {0x38, 640}, {0x16, 768},
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{0x39, 768}, {0x3A, 896}, {0x17, 960}, {0x3B, 1024},
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{0x18, 1152}, {0x19, 1280}, {0x3C, 1280}, {0x1A, 1536},
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{0x3D, 1536}, {0x3E, 1792}, {0x1B, 1920}, {0x3F, 2048},
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{0x1C, 2304}, {0x1D, 2560}, {0x1E, 3072}, {0x1F, 3840},
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};
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CFATTACH_DECL_NEW(imxi2c, sizeof(struct imxi2c_softc),
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imxi2c_match, imxi2c_attach, NULL, NULL);
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static uint8_t
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imxi2c_iord1(struct motoi2c_softc *sc, bus_size_t off)
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{
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if (off < I2CDFSRR)
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return bus_space_read_2(sc->sc_iot, sc->sc_ioh, off) & 0xff;
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else
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return 0;
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}
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static void
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imxi2c_iowr1(struct motoi2c_softc *sc, bus_size_t off, uint8_t data)
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{
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if (off < I2CDFSRR)
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bus_space_write_2(sc->sc_iot, sc->sc_ioh, off, data);
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}
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int
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imxi2c_attach_common(device_t parent, device_t self,
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bus_space_tag_t iot, paddr_t iobase, size_t size, int intr, int flags)
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{
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struct imxi2c_softc *sc = device_private(self);
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struct motoi2c_softc *msc = &sc->sc_motoi2c;
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int error;
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aprint_naive("\n");
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aprint_normal("\n");
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sc->sc_dev = self;
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msc->sc_iot = iot;
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error = bus_space_map(msc->sc_iot, iobase, size, 0, &msc->sc_ioh);
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if (error) {
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aprint_error_dev(sc->sc_dev,
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"failed to map registers (errno=%d)\n", error);
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return 1;
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}
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sc->sc_motoi2c_settings.i2c_adr = MOTOI2C_ADR_DEFAULT;
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sc->sc_motoi2c_settings.i2c_dfsrr = MOTOI2C_DFSRR_DEFAULT;
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msc->sc_iord = imxi2c_iord1;
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msc->sc_iowr = imxi2c_iowr1;
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motoi2c_attach_common(self, msc, &sc->sc_motoi2c_settings);
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return 0;
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}
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int
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imxi2c_set_freq(device_t self, long freq, int speed)
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{
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struct imxi2c_softc *sc = device_private(self);
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bool found = false;
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int index;
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for (index = 0; index < __arraycount(imxi2c_clk_div); index++) {
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if (freq / imxi2c_clk_div[index].div < speed) {
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found = true;
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break;
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}
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}
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if (found == false)
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sc->sc_motoi2c_settings.i2c_fdr = 0x1f;
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else
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sc->sc_motoi2c_settings.i2c_fdr = imxi2c_clk_div[index].ic_val;
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return 0;
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}
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