imx: reorganize IMX code as other SOCs

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>

1 files changed, 118 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/i2c-mxv7.c b/arch/arm/mach-imx/i2c-mxv7.c
new file mode 100644
index 0000000000..dfb5c1e82f
--- /dev/null
+++ b/arch/arm/mach-imx/i2c-mxv7.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2012 Boundary Devices Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <malloc.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/imx-regs.h>
+#include <linux/errno.h>
+#include <asm/gpio.h>
+#include <asm/mach-imx/mxc_i2c.h>
+#include <watchdog.h>
+
+int force_idle_bus(void *priv)
+{
+	int i;
+	int sda, scl;
+	ulong elapsed, start_time;
+	struct i2c_pads_info *p = (struct i2c_pads_info *)priv;
+	int ret = 0;
+
+	gpio_direction_input(p->sda.gp);
+	gpio_direction_input(p->scl.gp);
+
+	imx_iomux_v3_setup_pad(p->sda.gpio_mode);
+	imx_iomux_v3_setup_pad(p->scl.gpio_mode);
+
+	sda = gpio_get_value(p->sda.gp);
+	scl = gpio_get_value(p->scl.gp);
+	if ((sda & scl) == 1)
+		goto exit;		/* Bus is idle already */
+
+	printf("%s: sda=%d scl=%d sda.gp=0x%x scl.gp=0x%x\n", __func__,
+		sda, scl, p->sda.gp, p->scl.gp);
+	/* Send high and low on the SCL line */
+	for (i = 0; i < 9; i++) {
+		gpio_direction_output(p->scl.gp, 0);
+		udelay(50);
+		gpio_direction_input(p->scl.gp);
+		udelay(50);
+	}
+	start_time = get_timer(0);
+	for (;;) {
+		sda = gpio_get_value(p->sda.gp);
+		scl = gpio_get_value(p->scl.gp);
+		if ((sda & scl) == 1)
+			break;
+		WATCHDOG_RESET();
+		elapsed = get_timer(start_time);
+		if (elapsed > (CONFIG_SYS_HZ / 5)) {	/* .2 seconds */
+			ret = -EBUSY;
+			printf("%s: failed to clear bus, sda=%d scl=%d\n",
+					__func__, sda, scl);
+			break;
+		}
+	}
+exit:
+	imx_iomux_v3_setup_pad(p->sda.i2c_mode);
+	imx_iomux_v3_setup_pad(p->scl.i2c_mode);
+	return ret;
+}
+
+static void * const i2c_bases[] = {
+	(void *)I2C1_BASE_ADDR,
+	(void *)I2C2_BASE_ADDR,
+#ifdef I2C3_BASE_ADDR
+	(void *)I2C3_BASE_ADDR,
+#endif
+#ifdef I2C4_BASE_ADDR
+	(void *)I2C4_BASE_ADDR,
+#endif
+};
+
+/* i2c_index can be from 0 - 3 */
+int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
+	      struct i2c_pads_info *p)
+{
+	char name[9];
+	int ret;
+
+	if (i2c_index >= ARRAY_SIZE(i2c_bases))
+		return -EINVAL;
+
+	snprintf(name, sizeof(name), "i2c_sda%01d", i2c_index);
+	ret = gpio_request(p->sda.gp, name);
+	if (ret)
+		return ret;
+
+	snprintf(name, sizeof(name), "i2c_scl%01d", i2c_index);
+	ret = gpio_request(p->scl.gp, name);
+	if (ret)
+		goto err_req;
+
+	/* Enable i2c clock */
+	ret = enable_i2c_clk(1, i2c_index);
+	if (ret)
+		goto err_clk;
+
+	/* Make sure bus is idle */
+	ret = force_idle_bus(p);
+	if (ret)
+		goto err_idle;
+
+#ifndef CONFIG_DM_I2C
+	bus_i2c_init(i2c_index, speed, slave_addr, force_idle_bus, p);
+#endif
+
+	return 0;
+
+err_idle:
+err_clk:
+	gpio_free(p->scl.gp);
+err_req:
+	gpio_free(p->sda.gp);
+
+	return ret;
+}