mmdc.c (a8a93c6f9922c0d70459668c1300b226cb3918ab) mmdc.c (ec336b284136610a43c9daac56d66b20d43ddf7b)
1/*
2 * Copyright 2011 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
4 *
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
8 *

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16#include <linux/of.h>
17#include <linux/of_address.h>
18#include <linux/of_device.h>
19
20#define MMDC_MAPSR 0x404
21#define BP_MMDC_MAPSR_PSD 0
22#define BP_MMDC_MAPSR_PSS 4
23
1/*
2 * Copyright 2011 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
4 *
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
8 *

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16#include <linux/of.h>
17#include <linux/of_address.h>
18#include <linux/of_device.h>
19
20#define MMDC_MAPSR 0x404
21#define BP_MMDC_MAPSR_PSD 0
22#define BP_MMDC_MAPSR_PSS 4
23
24#define MMDC_MDMISC 0x18
25#define BM_MMDC_MDMISC_DDR_TYPE 0x18
26#define BP_MMDC_MDMISC_DDR_TYPE 0x3
27
28static int ddr_type;
29
24static int imx_mmdc_probe(struct platform_device *pdev)
25{
26 struct device_node *np = pdev->dev.of_node;
27 void __iomem *mmdc_base, *reg;
28 u32 val;
29 int timeout = 0x400;
30
31 mmdc_base = of_iomap(np, 0);
32 WARN_ON(!mmdc_base);
33
30static int imx_mmdc_probe(struct platform_device *pdev)
31{
32 struct device_node *np = pdev->dev.of_node;
33 void __iomem *mmdc_base, *reg;
34 u32 val;
35 int timeout = 0x400;
36
37 mmdc_base = of_iomap(np, 0);
38 WARN_ON(!mmdc_base);
39
40 reg = mmdc_base + MMDC_MDMISC;
41 /* Get ddr type */
42 val = readl_relaxed(reg);
43 ddr_type = (val & BM_MMDC_MDMISC_DDR_TYPE) >>
44 BP_MMDC_MDMISC_DDR_TYPE;
45
34 reg = mmdc_base + MMDC_MAPSR;
35
36 /* Enable automatic power saving */
37 val = readl_relaxed(reg);
38 val &= ~(1 << BP_MMDC_MAPSR_PSD);
39 writel_relaxed(val, reg);
40
41 /* Ensure it's successfully enabled */

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46 pr_warn("%s: failed to enable automatic power saving\n",
47 __func__);
48 return -EBUSY;
49 }
50
51 return 0;
52}
53
46 reg = mmdc_base + MMDC_MAPSR;
47
48 /* Enable automatic power saving */
49 val = readl_relaxed(reg);
50 val &= ~(1 << BP_MMDC_MAPSR_PSD);
51 writel_relaxed(val, reg);
52
53 /* Ensure it's successfully enabled */

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58 pr_warn("%s: failed to enable automatic power saving\n",
59 __func__);
60 return -EBUSY;
61 }
62
63 return 0;
64}
65
66int imx_mmdc_get_ddr_type(void)
67{
68 return ddr_type;
69}
70
54static struct of_device_id imx_mmdc_dt_ids[] = {
55 { .compatible = "fsl,imx6q-mmdc", },
56 { /* sentinel */ }
57};
58
59static struct platform_driver imx_mmdc_driver = {
60 .driver = {
61 .name = "imx-mmdc",
71static struct of_device_id imx_mmdc_dt_ids[] = {
72 { .compatible = "fsl,imx6q-mmdc", },
73 { /* sentinel */ }
74};
75
76static struct platform_driver imx_mmdc_driver = {
77 .driver = {
78 .name = "imx-mmdc",
79 .owner = THIS_MODULE,
62 .of_match_table = imx_mmdc_dt_ids,
63 },
64 .probe = imx_mmdc_probe,
65};
66
67static int __init imx_mmdc_init(void)
68{
69 return platform_driver_register(&imx_mmdc_driver);
70}
71postcore_initcall(imx_mmdc_init);
80 .of_match_table = imx_mmdc_dt_ids,
81 },
82 .probe = imx_mmdc_probe,
83};
84
85static int __init imx_mmdc_init(void)
86{
87 return platform_driver_register(&imx_mmdc_driver);
88}
89postcore_initcall(imx_mmdc_init);