[deliverable/linux.git] / drivers / pci / host / pci-layerscape.c

/*
 * PCIe host controller driver for Freescale Layerscape SoCs
 *
 * Copyright (C) 2014 Freescale Semiconductor.
 *
 * Author: Minghuan Lian <Minghuan.Lian@freescale.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/resource.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>

#include "pcie-designware.h"

/* PEX1/2 Misc Ports Status Register */
#define SCFG_PEXMSCPORTSR(pex_idx)	(0x94 + (pex_idx) * 4)
#define LTSSM_STATE_SHIFT	20
#define LTSSM_STATE_MASK	0x3f
#define LTSSM_PCIE_L0		0x11 /* L0 state */

/* PEX Internal Configuration Registers */
#define PCIE_STRFMR1		0x71c /* Symbol Timer & Filter Mask Register1 */
#define PCIE_DBI_RO_WR_EN	0x8bc /* DBI Read-Only Write Enable Register */

/* PEX LUT registers */
#define PCIE_LUT_DBG		0x7FC /* PEX LUT Debug Register */

struct ls_pcie_drvdata {
	u32 lut_offset;
	u32 ltssm_shift;
	struct pcie_host_ops *ops;
};

struct ls_pcie {
	void __iomem *dbi;
	void __iomem *lut;
	struct regmap *scfg;
	struct pcie_port pp;
	const struct ls_pcie_drvdata *drvdata;
	int index;
};

#define to_ls_pcie(x)	container_of(x, struct ls_pcie, pp)

static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
{
	u32 header_type;

	header_type = ioread8(pcie->dbi + PCI_HEADER_TYPE);
	header_type &= 0x7f;

	return header_type == PCI_HEADER_TYPE_BRIDGE;
}

/* Clear multi-function bit */
static void ls_pcie_clear_multifunction(struct ls_pcie *pcie)
{
	iowrite8(PCI_HEADER_TYPE_BRIDGE, pcie->dbi + PCI_HEADER_TYPE);
}

/* Fix class value */
static void ls_pcie_fix_class(struct ls_pcie *pcie)
{
	iowrite16(PCI_CLASS_BRIDGE_PCI, pcie->dbi + PCI_CLASS_DEVICE);
}

static int ls1021_pcie_link_up(struct pcie_port *pp)
{
	u32 state;
	struct ls_pcie *pcie = to_ls_pcie(pp);

	if (!pcie->scfg)
		return 0;

	regmap_read(pcie->scfg, SCFG_PEXMSCPORTSR(pcie->index), &state);
	state = (state >> LTSSM_STATE_SHIFT) & LTSSM_STATE_MASK;

	if (state < LTSSM_PCIE_L0)
		return 0;

	return 1;
}

static void ls1021_pcie_host_init(struct pcie_port *pp)
{
	struct ls_pcie *pcie = to_ls_pcie(pp);
	u32 val, index[2];

	pcie->scfg = syscon_regmap_lookup_by_phandle(pp->dev->of_node,
						     "fsl,pcie-scfg");
	if (IS_ERR(pcie->scfg)) {
		dev_err(pp->dev, "No syscfg phandle specified\n");
		pcie->scfg = NULL;
		return;
	}

	if (of_property_read_u32_array(pp->dev->of_node,
				       "fsl,pcie-scfg", index, 2)) {
		pcie->scfg = NULL;
		return;
	}
	pcie->index = index[1];

	dw_pcie_setup_rc(pp);

	/*
	 * LS1021A Workaround for internal TKT228622
	 * to fix the INTx hang issue
	 */
	val = ioread32(pcie->dbi + PCIE_STRFMR1);
	val &= 0xffff;
	iowrite32(val, pcie->dbi + PCIE_STRFMR1);
}

static int ls_pcie_link_up(struct pcie_port *pp)
{
	struct ls_pcie *pcie = to_ls_pcie(pp);
	u32 state;

	state = (ioread32(pcie->lut + PCIE_LUT_DBG) >>
		 pcie->drvdata->ltssm_shift) &
		 LTSSM_STATE_MASK;

	if (state < LTSSM_PCIE_L0)
		return 0;

	return 1;
}

static void ls_pcie_host_init(struct pcie_port *pp)
{
	struct ls_pcie *pcie = to_ls_pcie(pp);

	iowrite32(1, pcie->dbi + PCIE_DBI_RO_WR_EN);
	ls_pcie_fix_class(pcie);
	ls_pcie_clear_multifunction(pcie);
	iowrite32(0, pcie->dbi + PCIE_DBI_RO_WR_EN);
}

static int ls_pcie_msi_host_init(struct pcie_port *pp,
				 struct msi_controller *chip)
{
	struct device_node *msi_node;
	struct device_node *np = pp->dev->of_node;

	/*
	 * The MSI domain is set by the generic of_msi_configure().  This
	 * .msi_host_init() function keeps us from doing the default MSI
	 * domain setup in dw_pcie_host_init() and also enforces the
	 * requirement that "msi-parent" exists.
	 */
	msi_node = of_parse_phandle(np, "msi-parent", 0);
	if (!msi_node) {
		dev_err(pp->dev, "failed to find msi-parent\n");
		return -EINVAL;
	}

	return 0;
}

static struct pcie_host_ops ls1021_pcie_host_ops = {
	.link_up = ls1021_pcie_link_up,
	.host_init = ls1021_pcie_host_init,
	.msi_host_init = ls_pcie_msi_host_init,
};

static struct pcie_host_ops ls_pcie_host_ops = {
	.link_up = ls_pcie_link_up,
	.host_init = ls_pcie_host_init,
	.msi_host_init = ls_pcie_msi_host_init,
};

static struct ls_pcie_drvdata ls1021_drvdata = {
	.ops = &ls1021_pcie_host_ops,
};

static struct ls_pcie_drvdata ls1043_drvdata = {
	.lut_offset = 0x10000,
	.ltssm_shift = 24,
	.ops = &ls_pcie_host_ops,
};

static struct ls_pcie_drvdata ls2080_drvdata = {
	.lut_offset = 0x80000,
	.ltssm_shift = 0,
	.ops = &ls_pcie_host_ops,
};

static const struct of_device_id ls_pcie_of_match[] = {
	{ .compatible = "fsl,ls1021a-pcie", .data = &ls1021_drvdata },
	{ .compatible = "fsl,ls1043a-pcie", .data = &ls1043_drvdata },
	{ .compatible = "fsl,ls2080a-pcie", .data = &ls2080_drvdata },
	{ },
};
MODULE_DEVICE_TABLE(of, ls_pcie_of_match);

static int __init ls_add_pcie_port(struct pcie_port *pp,
				   struct platform_device *pdev)
{
	int ret;
	struct ls_pcie *pcie = to_ls_pcie(pp);

	pp->dev = &pdev->dev;
	pp->dbi_base = pcie->dbi;
	pp->ops = pcie->drvdata->ops;

	ret = dw_pcie_host_init(pp);
	if (ret) {
		dev_err(pp->dev, "failed to initialize host\n");
		return ret;
	}

	return 0;
}

static int __init ls_pcie_probe(struct platform_device *pdev)
{
	const struct of_device_id *match;
	struct ls_pcie *pcie;
	struct resource *dbi_base;
	int ret;

	match = of_match_device(ls_pcie_of_match, &pdev->dev);
	if (!match)
		return -ENODEV;

	pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
	if (!pcie)
		return -ENOMEM;

	dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
	pcie->dbi = devm_ioremap_resource(&pdev->dev, dbi_base);
	if (IS_ERR(pcie->dbi)) {
		dev_err(&pdev->dev, "missing *regs* space\n");
		return PTR_ERR(pcie->dbi);
	}

	pcie->drvdata = match->data;
	pcie->lut = pcie->dbi + pcie->drvdata->lut_offset;

	if (!ls_pcie_is_bridge(pcie))
		return -ENODEV;

	ret = ls_add_pcie_port(&pcie->pp, pdev);
	if (ret < 0)
		return ret;

	platform_set_drvdata(pdev, pcie);

	return 0;
}

static struct platform_driver ls_pcie_driver = {
	.driver = {
		.name = "layerscape-pcie",
		.of_match_table = ls_pcie_of_match,
	},
};

module_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);

MODULE_AUTHOR("Minghuan Lian <Minghuan.Lian@freescale.com>");
MODULE_DESCRIPTION("Freescale Layerscape PCIe host controller driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
	1	/*
	2	* PCIe host controller driver for Freescale Layerscape SoCs
	3	*
	4	* Copyright (C) 2014 Freescale Semiconductor.
	5	*
	6	* Author: Minghuan Lian <Minghuan.Lian@freescale.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/module.h>
	16	#include <linux/of_pci.h>
	17	#include <linux/of_platform.h>
	18	#include <linux/of_irq.h>
	19	#include <linux/of_address.h>
	20	#include <linux/pci.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/resource.h>
	23	#include <linux/mfd/syscon.h>
	24	#include <linux/regmap.h>
	25
	26	#include "pcie-designware.h"
	27
	28	/* PEX1/2 Misc Ports Status Register */
	29	#define SCFG_PEXMSCPORTSR(pex_idx) (0x94 + (pex_idx) * 4)
	30	#define LTSSM_STATE_SHIFT 20
	31	#define LTSSM_STATE_MASK 0x3f
	32	#define LTSSM_PCIE_L0 0x11 /* L0 state */
	33
	34	/* PEX Internal Configuration Registers */
	35	#define PCIE_STRFMR1 0x71c /* Symbol Timer & Filter Mask Register1 */
	36	#define PCIE_DBI_RO_WR_EN 0x8bc /* DBI Read-Only Write Enable Register */
	37
	38	/* PEX LUT registers */
	39	#define PCIE_LUT_DBG 0x7FC /* PEX LUT Debug Register */
	40
	41	struct ls_pcie_drvdata {
	42	u32 lut_offset;
	43	u32 ltssm_shift;
	44	struct pcie_host_ops *ops;
	45	};
	46
	47	struct ls_pcie {
	48	void __iomem *dbi;
	49	void __iomem *lut;
	50	struct regmap *scfg;
	51	struct pcie_port pp;
	52	const struct ls_pcie_drvdata *drvdata;
	53	int index;
	54	};
	55
	56	#define to_ls_pcie(x) container_of(x, struct ls_pcie, pp)
	57
	58	static bool ls_pcie_is_bridge(struct ls_pcie *pcie)
	59	{
	60	u32 header_type;
	61
	62	header_type = ioread8(pcie->dbi + PCI_HEADER_TYPE);
	63	header_type &= 0x7f;
	64
	65	return header_type == PCI_HEADER_TYPE_BRIDGE;
	66	}
	67
	68	/* Clear multi-function bit */
	69	static void ls_pcie_clear_multifunction(struct ls_pcie *pcie)
	70	{
	71	iowrite8(PCI_HEADER_TYPE_BRIDGE, pcie->dbi + PCI_HEADER_TYPE);
	72	}
	73
	74	/* Fix class value */
	75	static void ls_pcie_fix_class(struct ls_pcie *pcie)
	76	{
	77	iowrite16(PCI_CLASS_BRIDGE_PCI, pcie->dbi + PCI_CLASS_DEVICE);
	78	}
	79
	80	static int ls1021_pcie_link_up(struct pcie_port *pp)
	81	{
	82	u32 state;
	83	struct ls_pcie *pcie = to_ls_pcie(pp);
	84
	85	if (!pcie->scfg)
	86	return 0;
	87
	88	regmap_read(pcie->scfg, SCFG_PEXMSCPORTSR(pcie->index), &state);
	89	state = (state >> LTSSM_STATE_SHIFT) & LTSSM_STATE_MASK;
	90
	91	if (state < LTSSM_PCIE_L0)
	92	return 0;
	93
	94	return 1;
	95	}
	96
	97	static void ls1021_pcie_host_init(struct pcie_port *pp)
	98	{
	99	struct ls_pcie *pcie = to_ls_pcie(pp);
	100	u32 val, index[2];
	101
	102	pcie->scfg = syscon_regmap_lookup_by_phandle(pp->dev->of_node,
	103	"fsl,pcie-scfg");
	104	if (IS_ERR(pcie->scfg)) {
	105	dev_err(pp->dev, "No syscfg phandle specified\n");
	106	pcie->scfg = NULL;
	107	return;
	108	}
	109
	110	if (of_property_read_u32_array(pp->dev->of_node,
	111	"fsl,pcie-scfg", index, 2)) {
	112	pcie->scfg = NULL;
	113	return;
	114	}
	115	pcie->index = index[1];
	116
	117	dw_pcie_setup_rc(pp);
	118
	119	/*
	120	* LS1021A Workaround for internal TKT228622
	121	* to fix the INTx hang issue
	122	*/
	123	val = ioread32(pcie->dbi + PCIE_STRFMR1);
	124	val &= 0xffff;
	125	iowrite32(val, pcie->dbi + PCIE_STRFMR1);
	126	}
	127
	128	static int ls_pcie_link_up(struct pcie_port *pp)
	129	{
	130	struct ls_pcie *pcie = to_ls_pcie(pp);
	131	u32 state;
	132
	133	state = (ioread32(pcie->lut + PCIE_LUT_DBG) >>
	134	pcie->drvdata->ltssm_shift) &
	135	LTSSM_STATE_MASK;
	136
	137	if (state < LTSSM_PCIE_L0)
	138	return 0;
	139
	140	return 1;
	141	}
	142
	143	static void ls_pcie_host_init(struct pcie_port *pp)
	144	{
	145	struct ls_pcie *pcie = to_ls_pcie(pp);
	146
	147	iowrite32(1, pcie->dbi + PCIE_DBI_RO_WR_EN);
	148	ls_pcie_fix_class(pcie);
	149	ls_pcie_clear_multifunction(pcie);
	150	iowrite32(0, pcie->dbi + PCIE_DBI_RO_WR_EN);
	151	}
	152
	153	static int ls_pcie_msi_host_init(struct pcie_port *pp,
	154	struct msi_controller *chip)
	155	{
	156	struct device_node *msi_node;
	157	struct device_node *np = pp->dev->of_node;
	158
	159	/*
	160	* The MSI domain is set by the generic of_msi_configure(). This
	161	* .msi_host_init() function keeps us from doing the default MSI
	162	* domain setup in dw_pcie_host_init() and also enforces the
	163	* requirement that "msi-parent" exists.
	164	*/
	165	msi_node = of_parse_phandle(np, "msi-parent", 0);
	166	if (!msi_node) {
	167	dev_err(pp->dev, "failed to find msi-parent\n");
	168	return -EINVAL;
	169	}
	170
	171	return 0;
	172	}
	173
	174	static struct pcie_host_ops ls1021_pcie_host_ops = {
	175	.link_up = ls1021_pcie_link_up,
	176	.host_init = ls1021_pcie_host_init,
	177	.msi_host_init = ls_pcie_msi_host_init,
	178	};
	179
	180	static struct pcie_host_ops ls_pcie_host_ops = {
	181	.link_up = ls_pcie_link_up,
	182	.host_init = ls_pcie_host_init,
	183	.msi_host_init = ls_pcie_msi_host_init,
	184	};
	185
	186	static struct ls_pcie_drvdata ls1021_drvdata = {
	187	.ops = &ls1021_pcie_host_ops,
	188	};
	189
	190	static struct ls_pcie_drvdata ls1043_drvdata = {
	191	.lut_offset = 0x10000,
	192	.ltssm_shift = 24,
	193	.ops = &ls_pcie_host_ops,
	194	};
	195
	196	static struct ls_pcie_drvdata ls2080_drvdata = {
	197	.lut_offset = 0x80000,
	198	.ltssm_shift = 0,
	199	.ops = &ls_pcie_host_ops,
	200	};
	201
	202	static const struct of_device_id ls_pcie_of_match[] = {
	203	{ .compatible = "fsl,ls1021a-pcie", .data = &ls1021_drvdata },
	204	{ .compatible = "fsl,ls1043a-pcie", .data = &ls1043_drvdata },
	205	{ .compatible = "fsl,ls2080a-pcie", .data = &ls2080_drvdata },
	206	{ },
	207	};
	208	MODULE_DEVICE_TABLE(of, ls_pcie_of_match);
	209
	210	static int __init ls_add_pcie_port(struct pcie_port *pp,
	211	struct platform_device *pdev)
	212	{
	213	int ret;
	214	struct ls_pcie *pcie = to_ls_pcie(pp);
	215
	216	pp->dev = &pdev->dev;
	217	pp->dbi_base = pcie->dbi;
	218	pp->ops = pcie->drvdata->ops;
	219
	220	ret = dw_pcie_host_init(pp);
	221	if (ret) {
	222	dev_err(pp->dev, "failed to initialize host\n");
	223	return ret;
	224	}
	225
	226	return 0;
	227	}
	228
	229	static int __init ls_pcie_probe(struct platform_device *pdev)
	230	{
	231	const struct of_device_id *match;
	232	struct ls_pcie *pcie;
	233	struct resource *dbi_base;
	234	int ret;
	235
	236	match = of_match_device(ls_pcie_of_match, &pdev->dev);
	237	if (!match)
	238	return -ENODEV;
	239
	240	pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
	241	if (!pcie)
	242	return -ENOMEM;
	243
	244	dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
	245	pcie->dbi = devm_ioremap_resource(&pdev->dev, dbi_base);
	246	if (IS_ERR(pcie->dbi)) {
	247	dev_err(&pdev->dev, "missing regs space\n");
	248	return PTR_ERR(pcie->dbi);
	249	}
	250
	251	pcie->drvdata = match->data;
	252	pcie->lut = pcie->dbi + pcie->drvdata->lut_offset;
	253
	254	if (!ls_pcie_is_bridge(pcie))
	255	return -ENODEV;
	256
	257	ret = ls_add_pcie_port(&pcie->pp, pdev);
	258	if (ret < 0)
	259	return ret;
	260
	261	platform_set_drvdata(pdev, pcie);
	262
	263	return 0;
	264	}
	265
	266	static struct platform_driver ls_pcie_driver = {
	267	.driver = {
	268	.name = "layerscape-pcie",
	269	.of_match_table = ls_pcie_of_match,
	270	},
	271	};
	272
	273	module_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);
	274
	275	MODULE_AUTHOR("Minghuan Lian <Minghuan.Lian@freescale.com>");
	276	MODULE_DESCRIPTION("Freescale Layerscape PCIe host controller driver");
	277	MODULE_LICENSE("GPL v2");