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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
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// Author: Vignesh Raghavendra <vigneshr@ti.com>
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#include <common.h>
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#include <asm/io.h>
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#include <dm.h>
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#include <regmap.h>
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#include <syscon.h>
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#include <dm/device_compat.h>
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#define FSS_SYSC_REG 0x4
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#define HYPERBUS_CALIB_COUNT 25
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struct am654_hbmc_priv {
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void __iomem *mmiobase;
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bool calibrated;
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};
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/* Calibrate by looking for "QRY" string within the CFI space */
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static int am654_hyperbus_calibrate(struct udevice *dev)
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{
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struct am654_hbmc_priv *priv = dev_get_priv(dev);
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int count = HYPERBUS_CALIB_COUNT;
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int pass_count = 0;
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u16 qry[3];
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if (priv->calibrated)
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return 0;
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writew(0xF0, priv->mmiobase);
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writew(0x98, priv->mmiobase + 0xaa);
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while (count--) {
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qry[0] = readw(priv->mmiobase + 0x20);
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qry[1] = readw(priv->mmiobase + 0x22);
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qry[2] = readw(priv->mmiobase + 0x24);
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if (qry[0] == 'Q' && qry[1] == 'R' && qry[2] == 'Y')
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pass_count++;
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else
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pass_count = 0;
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if (pass_count == 5)
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break;
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}
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writew(0xF0, priv->mmiobase);
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writew(0xFF, priv->mmiobase);
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return pass_count == 5;
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}
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static int am654_select_hbmc(struct udevice *dev)
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{
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struct regmap *regmap = syscon_get_regmap(dev_get_parent(dev));
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return regmap_update_bits(regmap, FSS_SYSC_REG, 0x2, 0x2);
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}
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static int am654_hbmc_bind(struct udevice *dev)
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{
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return dm_scan_fdt_dev(dev);
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}
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static int am654_hbmc_probe(struct udevice *dev)
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{
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struct am654_hbmc_priv *priv = dev_get_priv(dev);
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int ret;
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priv->mmiobase = devfdt_remap_addr_index(dev, 1);
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if (dev_read_bool(dev, "mux-controls")) {
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ret = am654_select_hbmc(dev);
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if (ret) {
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dev_err(dev, "Failed to select HBMC mux\n");
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return ret;
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}
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}
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if (!priv->calibrated) {
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ret = am654_hyperbus_calibrate(dev);
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if (!ret) {
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dev_err(dev, "Calibration Failed\n");
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return -EIO;
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}
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}
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priv->calibrated = true;
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return 0;
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}
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static const struct udevice_id am654_hbmc_dt_ids[] = {
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{
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.compatible = "ti,am654-hbmc",
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},
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{ /* end of table */ }
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};
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U_BOOT_DRIVER(hbmc_am654) = {
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.name = "hbmc-am654",
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.id = UCLASS_MTD,
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.of_match = am654_hbmc_dt_ids,
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.probe = am654_hbmc_probe,
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.bind = am654_hbmc_bind,
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.priv_auto = sizeof(struct am654_hbmc_priv),
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};
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