Loading...
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>
8#include <linux/module.h>
9#include <linux/spi/pxa2xx_spi.h>
10#include <linux/clk-provider.h>
11
12#include <linux/dmaengine.h>
13#include <linux/platform_data/dma-dw.h>
14
15enum {
16 PORT_CE4100,
17 PORT_BYT,
18 PORT_BSW0,
19 PORT_BSW1,
20 PORT_BSW2,
21 PORT_QUARK_X1000,
22 PORT_LPT,
23};
24
25struct pxa_spi_info {
26 enum pxa_ssp_type type;
27 int port_id;
28 int num_chipselect;
29 unsigned long max_clk_rate;
30
31 /* DMA channel request parameters */
32 void *tx_param;
33 void *rx_param;
34};
35
36static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
37static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
38
39static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
40static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
41static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
42static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
43static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
44static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
45
46static struct dw_dma_slave lpt_tx_param = { .dst_id = 0 };
47static struct dw_dma_slave lpt_rx_param = { .src_id = 1 };
48
49static bool lpss_dma_filter(struct dma_chan *chan, void *param)
50{
51 struct dw_dma_slave *dws = param;
52
53 if (dws->dma_dev != chan->device->dev)
54 return false;
55
56 chan->private = dws;
57 return true;
58}
59
60static struct pxa_spi_info spi_info_configs[] = {
61 [PORT_CE4100] = {
62 .type = PXA25x_SSP,
63 .port_id = -1,
64 .num_chipselect = -1,
65 .max_clk_rate = 3686400,
66 },
67 [PORT_BYT] = {
68 .type = LPSS_BYT_SSP,
69 .port_id = 0,
70 .num_chipselect = 1,
71 .max_clk_rate = 50000000,
72 .tx_param = &byt_tx_param,
73 .rx_param = &byt_rx_param,
74 },
75 [PORT_BSW0] = {
76 .type = LPSS_BYT_SSP,
77 .port_id = 0,
78 .num_chipselect = 1,
79 .max_clk_rate = 50000000,
80 .tx_param = &bsw0_tx_param,
81 .rx_param = &bsw0_rx_param,
82 },
83 [PORT_BSW1] = {
84 .type = LPSS_BYT_SSP,
85 .port_id = 1,
86 .num_chipselect = 1,
87 .max_clk_rate = 50000000,
88 .tx_param = &bsw1_tx_param,
89 .rx_param = &bsw1_rx_param,
90 },
91 [PORT_BSW2] = {
92 .type = LPSS_BYT_SSP,
93 .port_id = 2,
94 .num_chipselect = 1,
95 .max_clk_rate = 50000000,
96 .tx_param = &bsw2_tx_param,
97 .rx_param = &bsw2_rx_param,
98 },
99 [PORT_QUARK_X1000] = {
100 .type = QUARK_X1000_SSP,
101 .port_id = -1,
102 .num_chipselect = 1,
103 .max_clk_rate = 50000000,
104 },
105 [PORT_LPT] = {
106 .type = LPSS_LPT_SSP,
107 .port_id = 0,
108 .num_chipselect = 1,
109 .max_clk_rate = 50000000,
110 .tx_param = &lpt_tx_param,
111 .rx_param = &lpt_rx_param,
112 },
113};
114
115static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
116 const struct pci_device_id *ent)
117{
118 struct platform_device_info pi;
119 int ret;
120 struct platform_device *pdev;
121 struct pxa2xx_spi_master spi_pdata;
122 struct ssp_device *ssp;
123 struct pxa_spi_info *c;
124 char buf[40];
125 struct pci_dev *dma_dev;
126
127 ret = pcim_enable_device(dev);
128 if (ret)
129 return ret;
130
131 ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
132 if (ret)
133 return ret;
134
135 c = &spi_info_configs[ent->driver_data];
136
137 memset(&spi_pdata, 0, sizeof(spi_pdata));
138 spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
139 c->num_chipselect : dev->devfn;
140
141 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
142
143 if (c->tx_param) {
144 struct dw_dma_slave *slave = c->tx_param;
145
146 slave->dma_dev = &dma_dev->dev;
147 slave->src_master = 1;
148 slave->dst_master = 0;
149 }
150
151 if (c->rx_param) {
152 struct dw_dma_slave *slave = c->rx_param;
153
154 slave->dma_dev = &dma_dev->dev;
155 slave->src_master = 1;
156 slave->dst_master = 0;
157 }
158
159 spi_pdata.dma_filter = lpss_dma_filter;
160 spi_pdata.tx_param = c->tx_param;
161 spi_pdata.rx_param = c->rx_param;
162 spi_pdata.enable_dma = c->rx_param && c->tx_param;
163
164 ssp = &spi_pdata.ssp;
165 ssp->phys_base = pci_resource_start(dev, 0);
166 ssp->mmio_base = pcim_iomap_table(dev)[0];
167 if (!ssp->mmio_base) {
168 dev_err(&dev->dev, "failed to ioremap() registers\n");
169 return -EIO;
170 }
171 ssp->irq = dev->irq;
172 ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
173 ssp->type = c->type;
174
175 snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
176 ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
177 CLK_IS_ROOT, c->max_clk_rate);
178 if (IS_ERR(ssp->clk))
179 return PTR_ERR(ssp->clk);
180
181 memset(&pi, 0, sizeof(pi));
182 pi.parent = &dev->dev;
183 pi.name = "pxa2xx-spi";
184 pi.id = ssp->port_id;
185 pi.data = &spi_pdata;
186 pi.size_data = sizeof(spi_pdata);
187
188 pdev = platform_device_register_full(&pi);
189 if (IS_ERR(pdev)) {
190 clk_unregister(ssp->clk);
191 return PTR_ERR(pdev);
192 }
193
194 pci_set_drvdata(dev, pdev);
195
196 return 0;
197}
198
199static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
200{
201 struct platform_device *pdev = pci_get_drvdata(dev);
202 struct pxa2xx_spi_master *spi_pdata;
203
204 spi_pdata = dev_get_platdata(&pdev->dev);
205
206 platform_device_unregister(pdev);
207 clk_unregister(spi_pdata->ssp.clk);
208}
209
210static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
211 { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
212 { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
213 { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
214 { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
215 { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
216 { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
217 { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT },
218 { },
219};
220MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
221
222static struct pci_driver pxa2xx_spi_pci_driver = {
223 .name = "pxa2xx_spi_pci",
224 .id_table = pxa2xx_spi_pci_devices,
225 .probe = pxa2xx_spi_pci_probe,
226 .remove = pxa2xx_spi_pci_remove,
227};
228
229module_pci_driver(pxa2xx_spi_pci_driver);
230
231MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
232MODULE_LICENSE("GPL v2");
233MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
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>
8#include <linux/module.h>
9#include <linux/spi/pxa2xx_spi.h>
10
11struct ce4100_info {
12 struct ssp_device ssp;
13 struct platform_device *spi_pdev;
14};
15
16static DEFINE_MUTEX(ssp_lock);
17static LIST_HEAD(ssp_list);
18
19struct ssp_device *pxa_ssp_request(int port, const char *label)
20{
21 struct ssp_device *ssp = NULL;
22
23 mutex_lock(&ssp_lock);
24
25 list_for_each_entry(ssp, &ssp_list, node) {
26 if (ssp->port_id == port && ssp->use_count == 0) {
27 ssp->use_count++;
28 ssp->label = label;
29 break;
30 }
31 }
32
33 mutex_unlock(&ssp_lock);
34
35 if (&ssp->node == &ssp_list)
36 return NULL;
37
38 return ssp;
39}
40EXPORT_SYMBOL_GPL(pxa_ssp_request);
41
42void pxa_ssp_free(struct ssp_device *ssp)
43{
44 mutex_lock(&ssp_lock);
45 if (ssp->use_count) {
46 ssp->use_count--;
47 ssp->label = NULL;
48 } else
49 dev_err(&ssp->pdev->dev, "device already free\n");
50 mutex_unlock(&ssp_lock);
51}
52EXPORT_SYMBOL_GPL(pxa_ssp_free);
53
54static int __devinit ce4100_spi_probe(struct pci_dev *dev,
55 const struct pci_device_id *ent)
56{
57 int ret;
58 resource_size_t phys_beg;
59 resource_size_t phys_len;
60 struct ce4100_info *spi_info;
61 struct platform_device *pdev;
62 struct pxa2xx_spi_master spi_pdata;
63 struct ssp_device *ssp;
64
65 ret = pci_enable_device(dev);
66 if (ret)
67 return ret;
68
69 phys_beg = pci_resource_start(dev, 0);
70 phys_len = pci_resource_len(dev, 0);
71
72 if (!request_mem_region(phys_beg, phys_len,
73 "CE4100 SPI")) {
74 dev_err(&dev->dev, "Can't request register space.\n");
75 ret = -EBUSY;
76 return ret;
77 }
78
79 pdev = platform_device_alloc("pxa2xx-spi", dev->devfn);
80 spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
81 if (!pdev || !spi_info ) {
82 ret = -ENOMEM;
83 goto err_nomem;
84 }
85 memset(&spi_pdata, 0, sizeof(spi_pdata));
86 spi_pdata.num_chipselect = dev->devfn;
87
88 ret = platform_device_add_data(pdev, &spi_pdata, sizeof(spi_pdata));
89 if (ret)
90 goto err_nomem;
91
92 pdev->dev.parent = &dev->dev;
93 pdev->dev.of_node = dev->dev.of_node;
94 ssp = &spi_info->ssp;
95 ssp->phys_base = pci_resource_start(dev, 0);
96 ssp->mmio_base = ioremap(phys_beg, phys_len);
97 if (!ssp->mmio_base) {
98 dev_err(&pdev->dev, "failed to ioremap() registers\n");
99 ret = -EIO;
100 goto err_nomem;
101 }
102 ssp->irq = dev->irq;
103 ssp->port_id = pdev->id;
104 ssp->type = PXA25x_SSP;
105
106 mutex_lock(&ssp_lock);
107 list_add(&ssp->node, &ssp_list);
108 mutex_unlock(&ssp_lock);
109
110 pci_set_drvdata(dev, spi_info);
111
112 ret = platform_device_add(pdev);
113 if (ret)
114 goto err_dev_add;
115
116 return ret;
117
118err_dev_add:
119 pci_set_drvdata(dev, NULL);
120 mutex_lock(&ssp_lock);
121 list_del(&ssp->node);
122 mutex_unlock(&ssp_lock);
123 iounmap(ssp->mmio_base);
124
125err_nomem:
126 release_mem_region(phys_beg, phys_len);
127 platform_device_put(pdev);
128 kfree(spi_info);
129 return ret;
130}
131
132static void __devexit ce4100_spi_remove(struct pci_dev *dev)
133{
134 struct ce4100_info *spi_info;
135 struct ssp_device *ssp;
136
137 spi_info = pci_get_drvdata(dev);
138 ssp = &spi_info->ssp;
139 platform_device_unregister(spi_info->spi_pdev);
140
141 iounmap(ssp->mmio_base);
142 release_mem_region(pci_resource_start(dev, 0),
143 pci_resource_len(dev, 0));
144
145 mutex_lock(&ssp_lock);
146 list_del(&ssp->node);
147 mutex_unlock(&ssp_lock);
148
149 pci_set_drvdata(dev, NULL);
150 pci_disable_device(dev);
151 kfree(spi_info);
152}
153
154static DEFINE_PCI_DEVICE_TABLE(ce4100_spi_devices) = {
155 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
156 { },
157};
158MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
159
160static struct pci_driver ce4100_spi_driver = {
161 .name = "ce4100_spi",
162 .id_table = ce4100_spi_devices,
163 .probe = ce4100_spi_probe,
164 .remove = __devexit_p(ce4100_spi_remove),
165};
166
167module_pci_driver(ce4100_spi_driver);
168
169MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
170MODULE_LICENSE("GPL v2");
171MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");