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https://github.com/AsahiLinux/u-boot
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552a848e4f
Change is consistent with other SOCs and it is in preparation for adding SOMs. SOC's related files are moved from cpu/ to mach-imx/<SOC>. This change is also coherent with the structure in kernel. Signed-off-by: Stefano Babic <sbabic@denx.de> CC: Fabio Estevam <fabio.estevam@nxp.com> CC: Akshay Bhat <akshaybhat@timesys.com> CC: Ken Lin <Ken.Lin@advantech.com.tw> CC: Marek Vasut <marek.vasut@gmail.com> CC: Heiko Schocher <hs@denx.de> CC: "Sébastien Szymanski" <sebastien.szymanski@armadeus.com> CC: Christian Gmeiner <christian.gmeiner@gmail.com> CC: Stefan Roese <sr@denx.de> CC: Patrick Bruenn <p.bruenn@beckhoff.com> CC: Troy Kisky <troy.kisky@boundarydevices.com> CC: Nikita Kiryanov <nikita@compulab.co.il> CC: Otavio Salvador <otavio@ossystems.com.br> CC: "Eric Bénard" <eric@eukrea.com> CC: Jagan Teki <jagan@amarulasolutions.com> CC: Ye Li <ye.li@nxp.com> CC: Peng Fan <peng.fan@nxp.com> CC: Adrian Alonso <adrian.alonso@nxp.com> CC: Alison Wang <b18965@freescale.com> CC: Tim Harvey <tharvey@gateworks.com> CC: Martin Donnelly <martin.donnelly@ge.com> CC: Marcin Niestroj <m.niestroj@grinn-global.com> CC: Lukasz Majewski <lukma@denx.de> CC: Adam Ford <aford173@gmail.com> CC: "Albert ARIBAUD (3ADEV)" <albert.aribaud@3adev.fr> CC: Boris Brezillon <boris.brezillon@free-electrons.com> CC: Soeren Moch <smoch@web.de> CC: Richard Hu <richard.hu@technexion.com> CC: Wig Cheng <wig.cheng@technexion.com> CC: Vanessa Maegima <vanessa.maegima@nxp.com> CC: Max Krummenacher <max.krummenacher@toradex.com> CC: Stefan Agner <stefan.agner@toradex.com> CC: Markus Niebel <Markus.Niebel@tq-group.com> CC: Breno Lima <breno.lima@nxp.com> CC: Francesco Montefoschi <francesco.montefoschi@udoo.org> CC: Jaehoon Chung <jh80.chung@samsung.com> CC: Scott Wood <oss@buserror.net> CC: Joe Hershberger <joe.hershberger@ni.com> CC: Anatolij Gustschin <agust@denx.de> CC: Simon Glass <sjg@chromium.org> CC: "Andrew F. Davis" <afd@ti.com> CC: "Łukasz Majewski" <l.majewski@samsung.com> CC: Patrice Chotard <patrice.chotard@st.com> CC: Nobuhiro Iwamatsu <iwamatsu@nigauri.org> CC: Hans de Goede <hdegoede@redhat.com> CC: Masahiro Yamada <yamada.masahiro@socionext.com> CC: Stephen Warren <swarren@nvidia.com> CC: Andre Przywara <andre.przywara@arm.com> CC: "Álvaro Fernández Rojas" <noltari@gmail.com> CC: York Sun <york.sun@nxp.com> CC: Xiaoliang Yang <xiaoliang.yang@nxp.com> CC: Chen-Yu Tsai <wens@csie.org> CC: George McCollister <george.mccollister@gmail.com> CC: Sven Ebenfeld <sven.ebenfeld@gmail.com> CC: Filip Brozovic <fbrozovic@gmail.com> CC: Petr Kulhavy <brain@jikos.cz> CC: Eric Nelson <eric@nelint.com> CC: Bai Ping <ping.bai@nxp.com> CC: Anson Huang <Anson.Huang@nxp.com> CC: Sanchayan Maity <maitysanchayan@gmail.com> CC: Lokesh Vutla <lokeshvutla@ti.com> CC: Patrick Delaunay <patrick.delaunay@st.com> CC: Gary Bisson <gary.bisson@boundarydevices.com> CC: Alexander Graf <agraf@suse.de> CC: u-boot@lists.denx.de Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com> Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
118 lines
2.4 KiB
C
118 lines
2.4 KiB
C
/*
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* Copyright (C) 2012 Boundary Devices Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <malloc.h>
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#include <asm/arch/clock.h>
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#include <asm/arch/imx-regs.h>
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#include <linux/errno.h>
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#include <asm/gpio.h>
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#include <asm/mach-imx/mxc_i2c.h>
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#include <watchdog.h>
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int force_idle_bus(void *priv)
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{
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int i;
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int sda, scl;
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ulong elapsed, start_time;
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struct i2c_pads_info *p = (struct i2c_pads_info *)priv;
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int ret = 0;
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gpio_direction_input(p->sda.gp);
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gpio_direction_input(p->scl.gp);
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imx_iomux_v3_setup_pad(p->sda.gpio_mode);
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imx_iomux_v3_setup_pad(p->scl.gpio_mode);
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sda = gpio_get_value(p->sda.gp);
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scl = gpio_get_value(p->scl.gp);
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if ((sda & scl) == 1)
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goto exit; /* Bus is idle already */
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printf("%s: sda=%d scl=%d sda.gp=0x%x scl.gp=0x%x\n", __func__,
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sda, scl, p->sda.gp, p->scl.gp);
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/* Send high and low on the SCL line */
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for (i = 0; i < 9; i++) {
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gpio_direction_output(p->scl.gp, 0);
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udelay(50);
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gpio_direction_input(p->scl.gp);
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udelay(50);
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}
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start_time = get_timer(0);
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for (;;) {
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sda = gpio_get_value(p->sda.gp);
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scl = gpio_get_value(p->scl.gp);
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if ((sda & scl) == 1)
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break;
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WATCHDOG_RESET();
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elapsed = get_timer(start_time);
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if (elapsed > (CONFIG_SYS_HZ / 5)) { /* .2 seconds */
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ret = -EBUSY;
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printf("%s: failed to clear bus, sda=%d scl=%d\n",
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__func__, sda, scl);
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break;
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}
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}
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exit:
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imx_iomux_v3_setup_pad(p->sda.i2c_mode);
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imx_iomux_v3_setup_pad(p->scl.i2c_mode);
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return ret;
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}
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static void * const i2c_bases[] = {
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(void *)I2C1_BASE_ADDR,
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(void *)I2C2_BASE_ADDR,
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#ifdef I2C3_BASE_ADDR
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(void *)I2C3_BASE_ADDR,
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#endif
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#ifdef I2C4_BASE_ADDR
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(void *)I2C4_BASE_ADDR,
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#endif
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};
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/* i2c_index can be from 0 - 3 */
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int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
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struct i2c_pads_info *p)
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{
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char name[9];
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int ret;
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if (i2c_index >= ARRAY_SIZE(i2c_bases))
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return -EINVAL;
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snprintf(name, sizeof(name), "i2c_sda%01d", i2c_index);
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ret = gpio_request(p->sda.gp, name);
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if (ret)
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return ret;
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snprintf(name, sizeof(name), "i2c_scl%01d", i2c_index);
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ret = gpio_request(p->scl.gp, name);
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if (ret)
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goto err_req;
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/* Enable i2c clock */
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ret = enable_i2c_clk(1, i2c_index);
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if (ret)
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goto err_clk;
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/* Make sure bus is idle */
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ret = force_idle_bus(p);
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if (ret)
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goto err_idle;
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#ifndef CONFIG_DM_I2C
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bus_i2c_init(i2c_index, speed, slave_addr, force_idle_bus, p);
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#endif
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return 0;
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err_idle:
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err_clk:
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gpio_free(p->scl.gp);
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err_req:
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gpio_free(p->sda.gp);
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return ret;
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}
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