1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * PCI interface driver for DW SPI Core
4 *
5 * Copyright (c) 2009, 2014 Intel Corporation.
6 */
7
8 #include <linux/pci.h>
9 #include <linux/pm_runtime.h>
10 #include <linux/slab.h>
11 #include <linux/spi/spi.h>
12 #include <linux/module.h>
13
14 #include "spi-dw.h"
15
16 #define DRIVER_NAME "dw_spi_pci"
17
18 /* HW info for MRST Clk Control Unit, 32b reg per controller */
19 #define MRST_SPI_CLK_BASE 100000000 /* 100m */
20 #define MRST_CLK_SPI_REG 0xff11d86c
21 #define CLK_SPI_BDIV_OFFSET 0
22 #define CLK_SPI_BDIV_MASK 0x00000007
23 #define CLK_SPI_CDIV_OFFSET 9
24 #define CLK_SPI_CDIV_MASK 0x00000e00
25 #define CLK_SPI_DISABLE_OFFSET 8
26
27 struct spi_pci_desc {
28 int (*setup)(struct dw_spi *);
29 u16 num_cs;
30 u16 bus_num;
31 u32 max_freq;
32 };
33
spi_mid_init(struct dw_spi * dws)34 static int spi_mid_init(struct dw_spi *dws)
35 {
36 void __iomem *clk_reg;
37 u32 clk_cdiv;
38
39 clk_reg = ioremap(MRST_CLK_SPI_REG, 16);
40 if (!clk_reg)
41 return -ENOMEM;
42
43 /* Get SPI controller operating freq info */
44 clk_cdiv = readl(clk_reg + dws->bus_num * sizeof(u32));
45 clk_cdiv &= CLK_SPI_CDIV_MASK;
46 clk_cdiv >>= CLK_SPI_CDIV_OFFSET;
47 dws->max_freq = MRST_SPI_CLK_BASE / (clk_cdiv + 1);
48
49 iounmap(clk_reg);
50
51 dw_spi_dma_setup_mfld(dws);
52
53 return 0;
54 }
55
spi_generic_init(struct dw_spi * dws)56 static int spi_generic_init(struct dw_spi *dws)
57 {
58 dw_spi_dma_setup_generic(dws);
59
60 return 0;
61 }
62
63 static struct spi_pci_desc spi_pci_mid_desc_1 = {
64 .setup = spi_mid_init,
65 .num_cs = 5,
66 .bus_num = 0,
67 };
68
69 static struct spi_pci_desc spi_pci_mid_desc_2 = {
70 .setup = spi_mid_init,
71 .num_cs = 2,
72 .bus_num = 1,
73 };
74
75 static struct spi_pci_desc spi_pci_ehl_desc = {
76 .setup = spi_generic_init,
77 .num_cs = 2,
78 .bus_num = -1,
79 .max_freq = 100000000,
80 };
81
spi_pci_probe(struct pci_dev * pdev,const struct pci_device_id * ent)82 static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
83 {
84 struct dw_spi *dws;
85 struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data;
86 int pci_bar = 0;
87 int ret;
88
89 ret = pcim_enable_device(pdev);
90 if (ret)
91 return ret;
92
93 dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL);
94 if (!dws)
95 return -ENOMEM;
96
97 /* Get basic io resource and map it */
98 dws->paddr = pci_resource_start(pdev, pci_bar);
99 pci_set_master(pdev);
100
101 ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev));
102 if (ret)
103 return ret;
104
105 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
106 if (ret < 0)
107 return ret;
108
109 dws->regs = pcim_iomap_table(pdev)[pci_bar];
110 dws->irq = pci_irq_vector(pdev, 0);
111
112 /*
113 * Specific handling for platforms, like dma setup,
114 * clock rate, FIFO depth.
115 */
116 if (desc) {
117 dws->num_cs = desc->num_cs;
118 dws->bus_num = desc->bus_num;
119 dws->max_freq = desc->max_freq;
120
121 if (desc->setup) {
122 ret = desc->setup(dws);
123 if (ret)
124 goto err_free_irq_vectors;
125 }
126 } else {
127 ret = -ENODEV;
128 goto err_free_irq_vectors;
129 }
130
131 ret = dw_spi_add_host(&pdev->dev, dws);
132 if (ret)
133 goto err_free_irq_vectors;
134
135 /* PCI hook and SPI hook use the same drv data */
136 pci_set_drvdata(pdev, dws);
137
138 dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
139 pdev->vendor, pdev->device);
140
141 pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
142 pm_runtime_use_autosuspend(&pdev->dev);
143 pm_runtime_put_autosuspend(&pdev->dev);
144 pm_runtime_allow(&pdev->dev);
145
146 return 0;
147
148 err_free_irq_vectors:
149 pci_free_irq_vectors(pdev);
150 return ret;
151 }
152
spi_pci_remove(struct pci_dev * pdev)153 static void spi_pci_remove(struct pci_dev *pdev)
154 {
155 struct dw_spi *dws = pci_get_drvdata(pdev);
156
157 pm_runtime_forbid(&pdev->dev);
158 pm_runtime_get_noresume(&pdev->dev);
159
160 dw_spi_remove_host(dws);
161 pci_free_irq_vectors(pdev);
162 }
163
164 #ifdef CONFIG_PM_SLEEP
spi_suspend(struct device * dev)165 static int spi_suspend(struct device *dev)
166 {
167 struct dw_spi *dws = dev_get_drvdata(dev);
168
169 return dw_spi_suspend_host(dws);
170 }
171
spi_resume(struct device * dev)172 static int spi_resume(struct device *dev)
173 {
174 struct dw_spi *dws = dev_get_drvdata(dev);
175
176 return dw_spi_resume_host(dws);
177 }
178 #endif
179
180 static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);
181
182 static const struct pci_device_id pci_ids[] = {
183 /* Intel MID platform SPI controller 0 */
184 /*
185 * The access to the device 8086:0801 is disabled by HW, since it's
186 * exclusively used by SCU to communicate with MSIC.
187 */
188 /* Intel MID platform SPI controller 1 */
189 { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1},
190 /* Intel MID platform SPI controller 2 */
191 { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2},
192 /* Intel Elkhart Lake PSE SPI controllers */
193 { PCI_VDEVICE(INTEL, 0x4b84), (kernel_ulong_t)&spi_pci_ehl_desc},
194 { PCI_VDEVICE(INTEL, 0x4b85), (kernel_ulong_t)&spi_pci_ehl_desc},
195 { PCI_VDEVICE(INTEL, 0x4b86), (kernel_ulong_t)&spi_pci_ehl_desc},
196 { PCI_VDEVICE(INTEL, 0x4b87), (kernel_ulong_t)&spi_pci_ehl_desc},
197 {},
198 };
199 MODULE_DEVICE_TABLE(pci, pci_ids);
200
201 static struct pci_driver dw_spi_driver = {
202 .name = DRIVER_NAME,
203 .id_table = pci_ids,
204 .probe = spi_pci_probe,
205 .remove = spi_pci_remove,
206 .driver = {
207 .pm = &dw_spi_pm_ops,
208 },
209 };
210
211 module_pci_driver(dw_spi_driver);
212
213 MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
214 MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
215 MODULE_LICENSE("GPL v2");
216