[mirror_ubuntu-bionic-kernel.git] / drivers / spi / spi-pxa2xx-pci.c

/*
 * CE4100's SPI device is more or less the same one as found on PXA
 *
 */
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/module.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>

#include <linux/dmaengine.h>
#include <linux/platform_data/dma-dw.h>

enum {
	PORT_CE4100,
	PORT_BYT,
	PORT_BSW0,
	PORT_BSW1,
	PORT_BSW2,
	PORT_QUARK_X1000,
};

struct pxa_spi_info {
	enum pxa_ssp_type type;
	int port_id;
	int num_chipselect;
	unsigned long max_clk_rate;

	/* DMA channel request parameters */
	void *tx_param;
	void *rx_param;
};

static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
static struct dw_dma_slave byt_rx_param = { .src_id = 1 };

static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };

static bool lpss_dma_filter(struct dma_chan *chan, void *param)
{
	struct dw_dma_slave *dws = param;

	if (dws->dma_dev != chan->device->dev)
		return false;

	chan->private = dws;
	return true;
}

static struct pxa_spi_info spi_info_configs[] = {
	[PORT_CE4100] = {
		.type = PXA25x_SSP,
		.port_id =  -1,
		.num_chipselect = -1,
		.max_clk_rate = 3686400,
	},
	[PORT_BYT] = {
		.type = LPSS_SSP,
		.port_id = 0,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
		.tx_param = &byt_tx_param,
		.rx_param = &byt_rx_param,
	},
	[PORT_BSW0] = {
		.type = LPSS_SSP,
		.port_id = 0,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
		.tx_param = &bsw0_tx_param,
		.rx_param = &bsw0_rx_param,
	},
	[PORT_BSW1] = {
		.type = LPSS_SSP,
		.port_id = 1,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
		.tx_param = &bsw1_tx_param,
		.rx_param = &bsw1_rx_param,
	},
	[PORT_BSW2] = {
		.type = LPSS_SSP,
		.port_id = 2,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
		.tx_param = &bsw2_tx_param,
		.rx_param = &bsw2_rx_param,
	},
	[PORT_QUARK_X1000] = {
		.type = QUARK_X1000_SSP,
		.port_id = -1,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
	},
};

static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
		const struct pci_device_id *ent)
{
	struct platform_device_info pi;
	int ret;
	struct platform_device *pdev;
	struct pxa2xx_spi_master spi_pdata;
	struct ssp_device *ssp;
	struct pxa_spi_info *c;
	char buf[40];
	struct pci_dev *dma_dev;

	ret = pcim_enable_device(dev);
	if (ret)
		return ret;

	ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
	if (ret)
		return ret;

	c = &spi_info_configs[ent->driver_data];

	memset(&spi_pdata, 0, sizeof(spi_pdata));
	spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
					c->num_chipselect : dev->devfn;

	dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));

	if (c->tx_param) {
		struct dw_dma_slave *slave = c->tx_param;

		slave->dma_dev = &dma_dev->dev;
		slave->src_master = 1;
		slave->dst_master = 0;
	}

	if (c->rx_param) {
		struct dw_dma_slave *slave = c->rx_param;

		slave->dma_dev = &dma_dev->dev;
		slave->src_master = 1;
		slave->dst_master = 0;
	}

	spi_pdata.dma_filter = lpss_dma_filter;
	spi_pdata.tx_param = c->tx_param;
	spi_pdata.rx_param = c->rx_param;
	spi_pdata.enable_dma = c->rx_param && c->tx_param;

	ssp = &spi_pdata.ssp;
	ssp->phys_base = pci_resource_start(dev, 0);
	ssp->mmio_base = pcim_iomap_table(dev)[0];
	if (!ssp->mmio_base) {
		dev_err(&dev->dev, "failed to ioremap() registers\n");
		return -EIO;
	}
	ssp->irq = dev->irq;
	ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
	ssp->type = c->type;

	snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
	ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
					CLK_IS_ROOT, c->max_clk_rate);
	 if (IS_ERR(ssp->clk))
		return PTR_ERR(ssp->clk);

	memset(&pi, 0, sizeof(pi));
	pi.parent = &dev->dev;
	pi.name = "pxa2xx-spi";
	pi.id = ssp->port_id;
	pi.data = &spi_pdata;
	pi.size_data = sizeof(spi_pdata);

	pdev = platform_device_register_full(&pi);
	if (IS_ERR(pdev)) {
		clk_unregister(ssp->clk);
		return PTR_ERR(pdev);
	}

	pci_set_drvdata(dev, pdev);

	return 0;
}

static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
{
	struct platform_device *pdev = pci_get_drvdata(dev);
	struct pxa2xx_spi_master *spi_pdata;

	spi_pdata = dev_get_platdata(&pdev->dev);

	platform_device_unregister(pdev);
	clk_unregister(spi_pdata->ssp.clk);
}

static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
	{ PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
	{ PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
	{ PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
	{ PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
	{ PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
	{ PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
	{ },
};
MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);

static struct pci_driver pxa2xx_spi_pci_driver = {
	.name           = "pxa2xx_spi_pci",
	.id_table       = pxa2xx_spi_pci_devices,
	.probe          = pxa2xx_spi_pci_probe,
	.remove         = pxa2xx_spi_pci_remove,
};

module_pci_driver(pxa2xx_spi_pci_driver);

MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
Commit	Line	Data
d6ea3df0 SAS	1	/*
	2	* CE4100's SPI device is more or less the same one as found on PXA
	3	*
	4	*/
	5	#include <linux/pci.h>
	6	#include <linux/platform_device.h>
	7	#include <linux/of_device.h>
d7614de4	8	#include <linux/module.h>
d6ea3df0	9	#include <linux/spi/pxa2xx_spi.h>
afa93c90 CCE	10	#include <linux/clk.h>
afa93c90 CCE	11	#include <linux/clk-provider.h>
d6ea3df0	12
b729bf34 MW	13	#include <linux/dmaengine.h>
	14	#include <linux/platform_data/dma-dw.h>
	15
d6ba32d5 CCE	16	enum {
	17	PORT_CE4100,
	18	PORT_BYT,
39d36536 MW	19	PORT_BSW0,
	20	PORT_BSW1,
	21	PORT_BSW2,
e5262d05	22	PORT_QUARK_X1000,
d6ba32d5 CCE	23	};
	24
	25	struct pxa_spi_info {
	26	enum pxa_ssp_type type;
	27	int port_id;
	28	int num_chipselect;
afa93c90	29	unsigned long max_clk_rate;
b729bf34 MW	30
	31	/* DMA channel request parameters */
	32	void *tx_param;
	33	void *rx_param;
d6ba32d5 CCE	34	};
d6ba32d5 CCE	35
b729bf34 MW	36	static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
	37	static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
	38
39d36536 MW	39	static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
	40	static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
	41	static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
	42	static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
	43	static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
	44	static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
	45
b729bf34 MW	46	static bool lpss_dma_filter(struct dma_chan chan, void param)
	47	{
	48	struct dw_dma_slave *dws = param;
	49
	50	if (dws->dma_dev != chan->device->dev)
	51	return false;
	52
	53	chan->private = dws;
	54	return true;
	55	}
	56
d6ba32d5 CCE	57	static struct pxa_spi_info spi_info_configs[] = {
	58	[PORT_CE4100] = {
	59	.type = PXA25x_SSP,
	60	.port_id = -1,
	61	.num_chipselect = -1,
afa93c90	62	.max_clk_rate = 3686400,
d6ba32d5 CCE	63	},
	64	[PORT_BYT] = {
	65	.type = LPSS_SSP,
	66	.port_id = 0,
	67	.num_chipselect = 1,
afa93c90	68	.max_clk_rate = 50000000,
b729bf34 MW	69	.tx_param = &byt_tx_param,
b729bf34 MW	70	.rx_param = &byt_rx_param,
d6ba32d5	71	},
39d36536 MW	72	[PORT_BSW0] = {
	73	.type = LPSS_SSP,
	74	.port_id = 0,
	75	.num_chipselect = 1,
	76	.max_clk_rate = 50000000,
	77	.tx_param = &bsw0_tx_param,
	78	.rx_param = &bsw0_rx_param,
	79	},
	80	[PORT_BSW1] = {
	81	.type = LPSS_SSP,
	82	.port_id = 1,
	83	.num_chipselect = 1,
	84	.max_clk_rate = 50000000,
	85	.tx_param = &bsw1_tx_param,
	86	.rx_param = &bsw1_rx_param,
	87	},
	88	[PORT_BSW2] = {
	89	.type = LPSS_SSP,
	90	.port_id = 2,
	91	.num_chipselect = 1,
	92	.max_clk_rate = 50000000,
	93	.tx_param = &bsw2_tx_param,
	94	.rx_param = &bsw2_rx_param,
d6ba32d5	95	},
e5262d05 WC	96	[PORT_QUARK_X1000] = {
	97	.type = QUARK_X1000_SSP,
	98	.port_id = -1,
	99	.num_chipselect = 1,
	100	.max_clk_rate = 50000000,
	101	},
d6ba32d5 CCE	102	};
	103
	104	static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
d6ea3df0 SAS	105	const struct pci_device_id *ent)
d6ea3df0 SAS	106	{
0202775b	107	struct platform_device_info pi;
d6ea3df0	108	int ret;
d6ea3df0	109	struct platform_device *pdev;
0f3e1d27	110	struct pxa2xx_spi_master spi_pdata;
d6ea3df0	111	struct ssp_device *ssp;
d6ba32d5	112	struct pxa_spi_info *c;
afa93c90	113	char buf[40];
b729bf34	114	struct pci_dev *dma_dev;
d6ea3df0	115
0202775b	116	ret = pcim_enable_device(dev);
d6ea3df0 SAS	117	if (ret)
	118	return ret;
	119
0202775b	120	ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
c1346340	121	if (ret)
d6ea3df0	122	return ret;
d6ea3df0	123
d6ba32d5 CCE	124	c = &spi_info_configs[ent->driver_data];
d6ba32d5 CCE	125
0f3e1d27	126	memset(&spi_pdata, 0, sizeof(spi_pdata));
d6ba32d5 CCE	127	spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
d6ba32d5 CCE	128	c->num_chipselect : dev->devfn;
b729bf34 MW	129
	130	dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
	131
	132	if (c->tx_param) {
	133	struct dw_dma_slave *slave = c->tx_param;
	134
	135	slave->dma_dev = &dma_dev->dev;
	136	slave->src_master = 1;
	137	slave->dst_master = 0;
	138	}
	139
	140	if (c->rx_param) {
	141	struct dw_dma_slave *slave = c->rx_param;
	142
	143	slave->dma_dev = &dma_dev->dev;
	144	slave->src_master = 1;
	145	slave->dst_master = 0;
	146	}
	147
	148	spi_pdata.dma_filter = lpss_dma_filter;
	149	spi_pdata.tx_param = c->tx_param;
	150	spi_pdata.rx_param = c->rx_param;
	151	spi_pdata.enable_dma = c->rx_param && c->tx_param;
d6ea3df0	152
851bacf5	153	ssp = &spi_pdata.ssp;
d6ea3df0	154	ssp->phys_base = pci_resource_start(dev, 0);
0202775b	155	ssp->mmio_base = pcim_iomap_table(dev)[0];
d6ea3df0	156	if (!ssp->mmio_base) {
0202775b MW	157	dev_err(&dev->dev, "failed to ioremap() registers\n");
0202775b MW	158	return -EIO;
d6ea3df0 SAS	159	}
d6ea3df0 SAS	160	ssp->irq = dev->irq;
d6ba32d5 CCE	161	ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
d6ba32d5 CCE	162	ssp->type = c->type;
d6ea3df0	163
afa93c90 CCE	164	snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
	165	ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
	166	CLK_IS_ROOT, c->max_clk_rate);
	167	if (IS_ERR(ssp->clk))
	168	return PTR_ERR(ssp->clk);
	169
0202775b MW	170	memset(&pi, 0, sizeof(pi));
	171	pi.parent = &dev->dev;
	172	pi.name = "pxa2xx-spi";
	173	pi.id = ssp->port_id;
	174	pi.data = &spi_pdata;
	175	pi.size_data = sizeof(spi_pdata);
d6ea3df0	176
0202775b	177	pdev = platform_device_register_full(&pi);
afa93c90 CCE	178	if (IS_ERR(pdev)) {
afa93c90 CCE	179	clk_unregister(ssp->clk);
d77b5382	180	return PTR_ERR(pdev);
afa93c90	181	}
d6ea3df0	182
851bacf5	183	pci_set_drvdata(dev, pdev);
d6ea3df0	184
0202775b	185	return 0;
d6ea3df0 SAS	186	}
d6ea3df0 SAS	187
d6ba32d5	188	static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
d6ea3df0	189	{
851bacf5	190	struct platform_device *pdev = pci_get_drvdata(dev);
afa93c90 CCE	191	struct pxa2xx_spi_master *spi_pdata;
	192
	193	spi_pdata = dev_get_platdata(&pdev->dev);
d6ea3df0	194
851bacf5	195	platform_device_unregister(pdev);
afa93c90	196	clk_unregister(spi_pdata->ssp.clk);
d6ea3df0 SAS	197	}
d6ea3df0 SAS	198
d6ba32d5 CCE	199	static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
d6ba32d5 CCE	200	{ PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
e5262d05	201	{ PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
d6ba32d5	202	{ PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
39d36536 MW	203	{ PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
	204	{ PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
	205	{ PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
d6ea3df0 SAS	206	{ },
d6ea3df0 SAS	207	};
d6ba32d5	208	MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
d6ea3df0	209
d6ba32d5 CCE	210	static struct pci_driver pxa2xx_spi_pci_driver = {
	211	.name = "pxa2xx_spi_pci",
	212	.id_table = pxa2xx_spi_pci_devices,
	213	.probe = pxa2xx_spi_pci_probe,
	214	.remove = pxa2xx_spi_pci_remove,
d6ea3df0 SAS	215	};
d6ea3df0 SAS	216
d6ba32d5	217	module_pci_driver(pxa2xx_spi_pci_driver);
d6ea3df0	218
d6ba32d5	219	MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
d6ea3df0 SAS	220	MODULE_LICENSE("GPL v2");
d6ea3df0 SAS	221	MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");