172 lines
3.6 KiB
C
172 lines
3.6 KiB
C
/*
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* EIM driver for Freescale's i.MX chips
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*
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* Copyright (C) 2013 Freescale Semiconductor, Inc.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <common.h>
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#include <driver.h>
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#include <init.h>
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#include <io.h>
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#include <of.h>
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struct imx_weim_devtype {
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unsigned int cs_count;
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unsigned int cs_regs_count;
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unsigned int cs_stride;
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};
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static const struct imx_weim_devtype imx1_weim_devtype = {
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.cs_count = 6,
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.cs_regs_count = 2,
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.cs_stride = 0x08,
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};
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static const struct imx_weim_devtype imx27_weim_devtype = {
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.cs_count = 6,
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.cs_regs_count = 3,
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.cs_stride = 0x10,
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};
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static const struct imx_weim_devtype imx50_weim_devtype = {
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.cs_count = 4,
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.cs_regs_count = 6,
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.cs_stride = 0x18,
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};
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static const struct imx_weim_devtype imx51_weim_devtype = {
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.cs_count = 6,
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.cs_regs_count = 6,
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.cs_stride = 0x18,
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};
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static struct of_device_id weim_id_table[] = {
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{
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/* i.MX1/21 */
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.compatible = "fsl,imx1-weim",
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.data = (unsigned long)&imx1_weim_devtype,
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}, {
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/* i.MX25/27/31/35 */
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.compatible = "fsl,imx27-weim",
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.data = (unsigned long)&imx27_weim_devtype,
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}, {
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/* i.MX50/53/6Q */
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.compatible = "fsl,imx50-weim",
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.data = (unsigned long)&imx50_weim_devtype,
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}, {
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/* i.MX51 */
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.compatible = "fsl,imx51-weim",
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.data = (unsigned long)&imx51_weim_devtype,
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}, {
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.compatible = "fsl,imx6q-weim",
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.data = (unsigned long)&imx50_weim_devtype,
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}, {
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}
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};
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struct imx_weim {
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struct device_d *dev;
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void __iomem *base;
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struct imx_weim_devtype *devtype;
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};
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/* Parse and set the timing for this device. */
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static int
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weim_timing_setup(struct imx_weim *weim, struct device_node *np)
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{
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struct imx_weim_devtype *devtype = weim->devtype;
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u32 cs_idx, value[devtype->cs_regs_count];
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int i, ret;
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/* get the CS index from this child node's "reg" property. */
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ret = of_property_read_u32(np, "reg", &cs_idx);
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if (ret)
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return ret;
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if (cs_idx >= devtype->cs_count)
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return -EINVAL;
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ret = of_property_read_u32_array(np, "fsl,weim-cs-timing",
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value, devtype->cs_regs_count);
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if (ret)
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return ret;
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dev_dbg(weim->dev, "setting up cs for %s\n", np->name);
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/* set the timing for WEIM */
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for (i = 0; i < devtype->cs_regs_count; i++)
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writel(value[i], weim->base + cs_idx * devtype->cs_stride + i * 4);
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return 0;
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}
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static int weim_parse_dt(struct imx_weim *weim)
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{
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struct device_node *child;
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int ret;
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for_each_child_of_node(weim->dev->device_node, child) {
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if (!child->name)
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continue;
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ret = weim_timing_setup(weim, child);
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if (ret) {
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dev_err(weim->dev, "%s set timing failed.\n",
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child->full_name);
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return ret;
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}
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}
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ret = of_platform_populate(weim->dev->device_node, NULL, weim->dev);
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if (ret)
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dev_err(weim->dev, "%s fail to create devices.\n",
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weim->dev->device_node->full_name);
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return ret;
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}
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static int weim_probe(struct device_d *dev)
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{
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struct imx_weim_devtype *devtype;
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struct imx_weim *weim;
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int ret;
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ret = dev_get_drvdata(dev, (unsigned long *)&devtype);
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if (ret)
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return ret;
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weim = xzalloc(sizeof(*weim));
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weim->dev = dev;
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weim->devtype = devtype;
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/* get the resource */
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weim->base = dev_request_mem_region(dev, 0);
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if (!weim->base) {
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ret = -EBUSY;
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goto weim_err;
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}
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/* parse the device node */
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ret = weim_parse_dt(weim);
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if (ret) {
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goto weim_err;
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}
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dev_info(dev, "WEIM driver registered.\n");
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return 0;
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weim_err:
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return ret;
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}
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static struct driver_d weim_driver = {
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.name = "imx-weim",
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.of_compatible = DRV_OF_COMPAT(weim_id_table),
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.probe = weim_probe,
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};
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device_platform_driver(weim_driver);
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