[linux-2.6-block.git] / drivers / ata / ahci_da850.c

/*
 * DaVinci DA850 AHCI SATA platform driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/libata.h>
#include <linux/ahci_platform.h>
#include "ahci.h"

/* SATA PHY Control Register offset from AHCI base */
#define SATA_P0PHYCR_REG	0x178

#define SATA_PHY_MPY(x)		((x) << 0)
#define SATA_PHY_LOS(x)		((x) << 6)
#define SATA_PHY_RXCDR(x)	((x) << 10)
#define SATA_PHY_RXEQ(x)	((x) << 13)
#define SATA_PHY_TXSWING(x)	((x) << 19)
#define SATA_PHY_ENPLL(x)	((x) << 31)

/*
 * The multiplier needed for 1.5GHz PLL output.
 *
 * NOTE: This is currently hardcoded to be suitable for 100MHz crystal
 * frequency (which is used by DA850 EVM board) and may need to be changed
 * if you would like to use this driver on some other board.
 */
#define DA850_SATA_CLK_MULTIPLIER	7

static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,
			    void __iomem *ahci_base)
{
	unsigned int val;

	/* Enable SATA clock receiver */
	val = readl(pwrdn_reg);
	val &= ~BIT(0);
	writel(val, pwrdn_reg);

	val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) |
	      SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) |
	      SATA_PHY_ENPLL(1);

	writel(val, ahci_base + SATA_P0PHYCR_REG);
}

static const struct ata_port_info ahci_da850_port_info = {
	.flags		= AHCI_FLAG_COMMON,
	.pio_mask	= ATA_PIO4,
	.udma_mask	= ATA_UDMA6,
	.port_ops	= &ahci_platform_ops,
};

static int ahci_da850_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct ahci_host_priv *hpriv;
	struct resource *res;
	void __iomem *pwrdn_reg;
	int rc;

	hpriv = ahci_platform_get_resources(pdev);
	if (IS_ERR(hpriv))
		return PTR_ERR(hpriv);

	rc = ahci_platform_enable_resources(hpriv);
	if (rc)
		return rc;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!res)
		goto disable_resources;

	pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
	if (!pwrdn_reg)
		goto disable_resources;

	da850_sata_init(dev, pwrdn_reg, hpriv->mmio);

	rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info, 0, 0);
	if (rc)
		goto disable_resources;

	return 0;
disable_resources:
	ahci_platform_disable_resources(hpriv);
	return rc;
}

static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
			 ahci_platform_resume);

static struct platform_driver ahci_da850_driver = {
	.probe = ahci_da850_probe,
	.remove = ata_platform_remove_one,
	.driver = {
		.name = "ahci_da850",
		.owner = THIS_MODULE,
		.pm = &ahci_da850_pm_ops,
	},
};
module_platform_driver(ahci_da850_driver);

MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
ae8723f8 BZ	1	/*
	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
	19	/* SATA PHY Control Register offset from AHCI base */
	20	#define SATA_P0PHYCR_REG 0x178
	21
	22	#define SATA_PHY_MPY(x) ((x) << 0)
	23	#define SATA_PHY_LOS(x) ((x) << 6)
	24	#define SATA_PHY_RXCDR(x) ((x) << 10)
	25	#define SATA_PHY_RXEQ(x) ((x) << 13)
	26	#define SATA_PHY_TXSWING(x) ((x) << 19)
	27	#define SATA_PHY_ENPLL(x) ((x) << 31)
	28
	29	/*
	30	* The multiplier needed for 1.5GHz PLL output.
	31	*
	32	* NOTE: This is currently hardcoded to be suitable for 100MHz crystal
	33	* frequency (which is used by DA850 EVM board) and may need to be changed
	34	* if you would like to use this driver on some other board.
	35	*/
	36	#define DA850_SATA_CLK_MULTIPLIER 7
	37
	38	static void da850_sata_init(struct device dev, void __iomem pwrdn_reg,
	39	void __iomem *ahci_base)
	40	{
	41	unsigned int val;
	42
	43	/* Enable SATA clock receiver */
	44	val = readl(pwrdn_reg);
	45	val &= ~BIT(0);
	46	writel(val, pwrdn_reg);
	47
	48	val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) \| SATA_PHY_LOS(1) \|
	49	SATA_PHY_RXCDR(4) \| SATA_PHY_RXEQ(1) \| SATA_PHY_TXSWING(3) \|
	50	SATA_PHY_ENPLL(1);
	51
	52	writel(val, ahci_base + SATA_P0PHYCR_REG);
	53	}
	54
	55	static const struct ata_port_info ahci_da850_port_info = {
	56	.flags = AHCI_FLAG_COMMON,
	57	.pio_mask = ATA_PIO4,
	58	.udma_mask = ATA_UDMA6,
	59	.port_ops = &ahci_platform_ops,
	60	};
	61
	62	static int ahci_da850_probe(struct platform_device *pdev)
	63	{
	64	struct device *dev = &pdev->dev;
65	struct ahci_host_priv *hpriv;
66	struct resource *res;
67	void __iomem *pwrdn_reg;
68	int rc;
69
70	hpriv = ahci_platform_get_resources(pdev);
71	if (IS_ERR(hpriv))
72	return PTR_ERR(hpriv);
73
74	rc = ahci_platform_enable_resources(hpriv);
75	if (rc)
76	return rc;
77
78	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
79	if (!res)
80	goto disable_resources;
81
82	pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
83	if (!pwrdn_reg)
84	goto disable_resources;
85
86	da850_sata_init(dev, pwrdn_reg, hpriv->mmio);
87
88	rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info, 0, 0);
89	if (rc)
90	goto disable_resources;
91
92	return 0;
93	disable_resources:
94	ahci_platform_disable_resources(hpriv);
95	return rc;
96	}
97
98	static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
99	ahci_platform_resume);
100
101	static struct platform_driver ahci_da850_driver = {
102	.probe = ahci_da850_probe,
103	.remove = ata_platform_remove_one,
104	.driver = {
105	.name = "ahci_da850",
106	.owner = THIS_MODULE,
107	.pm = &ahci_da850_pm_ops,
108	},
109	};
110	module_platform_driver(ahci_da850_driver);
111
112	MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
113	MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
114	MODULE_LICENSE("GPL");