blob: 267a3d3e79f4dc755be11b903453b687d94c313e [file] [log] [blame]
Bartlomiej Zolnierkiewiczae8723f2014-03-25 19:51:40 +01001/*
2 * DaVinci DA850 AHCI SATA platform driver
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2, or (at your option)
7 * any later version.
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/pm.h>
13#include <linux/device.h>
14#include <linux/platform_device.h>
15#include <linux/libata.h>
16#include <linux/ahci_platform.h>
17#include "ahci.h"
18
Akinobu Mita018d5ef2015-01-29 08:30:29 +090019#define DRV_NAME "ahci_da850"
20
Bartlomiej Zolnierkiewiczae8723f2014-03-25 19:51:40 +010021/* SATA PHY Control Register offset from AHCI base */
22#define SATA_P0PHYCR_REG 0x178
23
24#define SATA_PHY_MPY(x) ((x) << 0)
25#define SATA_PHY_LOS(x) ((x) << 6)
26#define SATA_PHY_RXCDR(x) ((x) << 10)
27#define SATA_PHY_RXEQ(x) ((x) << 13)
28#define SATA_PHY_TXSWING(x) ((x) << 19)
29#define SATA_PHY_ENPLL(x) ((x) << 31)
30
31/*
32 * The multiplier needed for 1.5GHz PLL output.
33 *
34 * NOTE: This is currently hardcoded to be suitable for 100MHz crystal
35 * frequency (which is used by DA850 EVM board) and may need to be changed
36 * if you would like to use this driver on some other board.
37 */
38#define DA850_SATA_CLK_MULTIPLIER 7
39
40static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,
41 void __iomem *ahci_base)
42{
43 unsigned int val;
44
45 /* Enable SATA clock receiver */
46 val = readl(pwrdn_reg);
47 val &= ~BIT(0);
48 writel(val, pwrdn_reg);
49
50 val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) |
51 SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) |
52 SATA_PHY_ENPLL(1);
53
54 writel(val, ahci_base + SATA_P0PHYCR_REG);
55}
56
57static const struct ata_port_info ahci_da850_port_info = {
58 .flags = AHCI_FLAG_COMMON,
59 .pio_mask = ATA_PIO4,
60 .udma_mask = ATA_UDMA6,
61 .port_ops = &ahci_platform_ops,
62};
63
Akinobu Mita018d5ef2015-01-29 08:30:29 +090064static struct scsi_host_template ahci_platform_sht = {
65 AHCI_SHT(DRV_NAME),
66};
67
Bartlomiej Zolnierkiewiczae8723f2014-03-25 19:51:40 +010068static int ahci_da850_probe(struct platform_device *pdev)
69{
70 struct device *dev = &pdev->dev;
71 struct ahci_host_priv *hpriv;
72 struct resource *res;
73 void __iomem *pwrdn_reg;
74 int rc;
75
76 hpriv = ahci_platform_get_resources(pdev);
77 if (IS_ERR(hpriv))
78 return PTR_ERR(hpriv);
79
80 rc = ahci_platform_enable_resources(hpriv);
81 if (rc)
82 return rc;
83
84 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
85 if (!res)
86 goto disable_resources;
87
88 pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
89 if (!pwrdn_reg)
90 goto disable_resources;
91
92 da850_sata_init(dev, pwrdn_reg, hpriv->mmio);
93
Akinobu Mita018d5ef2015-01-29 08:30:29 +090094 rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info,
95 &ahci_platform_sht);
Bartlomiej Zolnierkiewiczae8723f2014-03-25 19:51:40 +010096 if (rc)
97 goto disable_resources;
98
99 return 0;
100disable_resources:
101 ahci_platform_disable_resources(hpriv);
102 return rc;
103}
104
105static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
106 ahci_platform_resume);
107
108static struct platform_driver ahci_da850_driver = {
109 .probe = ahci_da850_probe,
110 .remove = ata_platform_remove_one,
111 .driver = {
Akinobu Mita018d5ef2015-01-29 08:30:29 +0900112 .name = DRV_NAME,
Bartlomiej Zolnierkiewiczae8723f2014-03-25 19:51:40 +0100113 .pm = &ahci_da850_pm_ops,
114 },
115};
116module_platform_driver(ahci_da850_driver);
117
118MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
119MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
120MODULE_LICENSE("GPL");