Loading...
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
27struct dw_spi_pci_desc {
28 int (*setup)(struct dw_spi *);
29 u16 num_cs;
30 u16 bus_num;
31 u32 max_freq;
32};
33
34static int dw_spi_pci_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
56static int dw_spi_pci_generic_init(struct dw_spi *dws)
57{
58 dw_spi_dma_setup_generic(dws);
59
60 return 0;
61}
62
63static struct dw_spi_pci_desc dw_spi_pci_mid_desc_1 = {
64 .setup = dw_spi_pci_mid_init,
65 .num_cs = 5,
66 .bus_num = 0,
67};
68
69static struct dw_spi_pci_desc dw_spi_pci_mid_desc_2 = {
70 .setup = dw_spi_pci_mid_init,
71 .num_cs = 2,
72 .bus_num = 1,
73};
74
75static struct dw_spi_pci_desc dw_spi_pci_ehl_desc = {
76 .setup = dw_spi_pci_generic_init,
77 .num_cs = 2,
78 .bus_num = -1,
79 .max_freq = 100000000,
80};
81
82static int dw_spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
83{
84 struct dw_spi_pci_desc *desc = (struct dw_spi_pci_desc *)ent->driver_data;
85 struct dw_spi *dws;
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
148err_free_irq_vectors:
149 pci_free_irq_vectors(pdev);
150 return ret;
151}
152
153static void dw_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
165static int dw_spi_pci_suspend(struct device *dev)
166{
167 struct dw_spi *dws = dev_get_drvdata(dev);
168
169 return dw_spi_suspend_host(dws);
170}
171
172static int dw_spi_pci_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
180static SIMPLE_DEV_PM_OPS(dw_spi_pci_pm_ops, dw_spi_pci_suspend, dw_spi_pci_resume);
181
182static const struct pci_device_id dw_spi_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)&dw_spi_pci_mid_desc_1},
190 /* Intel MID platform SPI controller 2 */
191 { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&dw_spi_pci_mid_desc_2},
192 /* Intel Elkhart Lake PSE SPI controllers */
193 { PCI_VDEVICE(INTEL, 0x4b84), (kernel_ulong_t)&dw_spi_pci_ehl_desc},
194 { PCI_VDEVICE(INTEL, 0x4b85), (kernel_ulong_t)&dw_spi_pci_ehl_desc},
195 { PCI_VDEVICE(INTEL, 0x4b86), (kernel_ulong_t)&dw_spi_pci_ehl_desc},
196 { PCI_VDEVICE(INTEL, 0x4b87), (kernel_ulong_t)&dw_spi_pci_ehl_desc},
197 {},
198};
199MODULE_DEVICE_TABLE(pci, dw_spi_pci_ids);
200
201static struct pci_driver dw_spi_pci_driver = {
202 .name = DRIVER_NAME,
203 .id_table = dw_spi_pci_ids,
204 .probe = dw_spi_pci_probe,
205 .remove = dw_spi_pci_remove,
206 .driver = {
207 .pm = &dw_spi_pci_pm_ops,
208 },
209};
210module_pci_driver(dw_spi_pci_driver);
211
212MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
213MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
214MODULE_LICENSE("GPL v2");
215MODULE_IMPORT_NS(SPI_DW_CORE);
1/*
2 * PCI interface driver for DW SPI Core
3 *
4 * Copyright (c) 2009, 2014 Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 */
15
16#include <linux/interrupt.h>
17#include <linux/pci.h>
18#include <linux/slab.h>
19#include <linux/spi/spi.h>
20#include <linux/module.h>
21
22#include "spi-dw.h"
23
24#define DRIVER_NAME "dw_spi_pci"
25
26struct spi_pci_desc {
27 int (*setup)(struct dw_spi *);
28 u16 num_cs;
29 u16 bus_num;
30};
31
32static struct spi_pci_desc spi_pci_mid_desc_1 = {
33 .setup = dw_spi_mid_init,
34 .num_cs = 5,
35 .bus_num = 0,
36};
37
38static struct spi_pci_desc spi_pci_mid_desc_2 = {
39 .setup = dw_spi_mid_init,
40 .num_cs = 2,
41 .bus_num = 1,
42};
43
44static int spi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
45{
46 struct dw_spi *dws;
47 struct spi_pci_desc *desc = (struct spi_pci_desc *)ent->driver_data;
48 int pci_bar = 0;
49 int ret;
50
51 ret = pcim_enable_device(pdev);
52 if (ret)
53 return ret;
54
55 dws = devm_kzalloc(&pdev->dev, sizeof(*dws), GFP_KERNEL);
56 if (!dws)
57 return -ENOMEM;
58
59 /* Get basic io resource and map it */
60 dws->paddr = pci_resource_start(pdev, pci_bar);
61
62 ret = pcim_iomap_regions(pdev, 1 << pci_bar, pci_name(pdev));
63 if (ret)
64 return ret;
65
66 dws->regs = pcim_iomap_table(pdev)[pci_bar];
67 dws->irq = pdev->irq;
68
69 /*
70 * Specific handling for platforms, like dma setup,
71 * clock rate, FIFO depth.
72 */
73 if (desc) {
74 dws->num_cs = desc->num_cs;
75 dws->bus_num = desc->bus_num;
76
77 if (desc->setup) {
78 ret = desc->setup(dws);
79 if (ret)
80 return ret;
81 }
82 } else {
83 return -ENODEV;
84 }
85
86 ret = dw_spi_add_host(&pdev->dev, dws);
87 if (ret)
88 return ret;
89
90 /* PCI hook and SPI hook use the same drv data */
91 pci_set_drvdata(pdev, dws);
92
93 dev_info(&pdev->dev, "found PCI SPI controller(ID: %04x:%04x)\n",
94 pdev->vendor, pdev->device);
95
96 return 0;
97}
98
99static void spi_pci_remove(struct pci_dev *pdev)
100{
101 struct dw_spi *dws = pci_get_drvdata(pdev);
102
103 dw_spi_remove_host(dws);
104}
105
106#ifdef CONFIG_PM_SLEEP
107static int spi_suspend(struct device *dev)
108{
109 struct pci_dev *pdev = to_pci_dev(dev);
110 struct dw_spi *dws = pci_get_drvdata(pdev);
111
112 return dw_spi_suspend_host(dws);
113}
114
115static int spi_resume(struct device *dev)
116{
117 struct pci_dev *pdev = to_pci_dev(dev);
118 struct dw_spi *dws = pci_get_drvdata(pdev);
119
120 return dw_spi_resume_host(dws);
121}
122#endif
123
124static SIMPLE_DEV_PM_OPS(dw_spi_pm_ops, spi_suspend, spi_resume);
125
126static const struct pci_device_id pci_ids[] = {
127 /* Intel MID platform SPI controller 0 */
128 /*
129 * The access to the device 8086:0801 is disabled by HW, since it's
130 * exclusively used by SCU to communicate with MSIC.
131 */
132 /* Intel MID platform SPI controller 1 */
133 { PCI_VDEVICE(INTEL, 0x0800), (kernel_ulong_t)&spi_pci_mid_desc_1},
134 /* Intel MID platform SPI controller 2 */
135 { PCI_VDEVICE(INTEL, 0x0812), (kernel_ulong_t)&spi_pci_mid_desc_2},
136 {},
137};
138
139static struct pci_driver dw_spi_driver = {
140 .name = DRIVER_NAME,
141 .id_table = pci_ids,
142 .probe = spi_pci_probe,
143 .remove = spi_pci_remove,
144 .driver = {
145 .pm = &dw_spi_pm_ops,
146 },
147};
148
149module_pci_driver(dw_spi_driver);
150
151MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>");
152MODULE_DESCRIPTION("PCI interface driver for DW SPI Core");
153MODULE_LICENSE("GPL v2");