1 // SPDX-License-Identifier: GPL-2.0
2 /* Driver for Pericom UART */
3
4 #include <linux/bits.h>
5 #include <linux/module.h>
6 #include <linux/overflow.h>
7 #include <linux/pci.h>
8
9 #include "8250.h"
10
11 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SDB 0x1051
12 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2S 0x1053
13 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_4 0x105a
14 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_4 0x105b
15 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SDB 0x105c
16 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4S 0x105e
17 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_8 0x106a
18 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_8 0x106b
19 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_2DB 0x1091
20 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_2 0x1093
21 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4 0x1098
22 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4DB 0x1099
23 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_4 0x109b
24 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_8 0x10a9
25 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SMDB 0x10d1
26 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2SM 0x10d3
27 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SM 0x10d9
28 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SMDB 0x10da
29 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4SM 0x10dc
30 #define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_8SM 0x10e9
31 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_1 0x1108
32 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_2 0x1110
33 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_2 0x1111
34 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_4 0x1118
35 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_4 0x1119
36 #define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2S 0x1152
37 #define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4S 0x115a
38 #define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_2 0x1190
39 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_2 0x1191
40 #define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_4 0x1198
41 #define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_4 0x1199
42 #define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2SM 0x11d0
43 #define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4SM 0x11d8
44
45 struct pericom8250 {
46 void __iomem *virt;
47 unsigned int nr;
48 int line[];
49 };
50
pericom_do_set_divisor(struct uart_port * port,unsigned int baud,unsigned int quot,unsigned int quot_frac)51 static void pericom_do_set_divisor(struct uart_port *port, unsigned int baud,
52 unsigned int quot, unsigned int quot_frac)
53 {
54 int scr;
55
56 for (scr = 16; scr > 4; scr--) {
57 unsigned int maxrate = port->uartclk / scr;
58 unsigned int divisor = max(maxrate / baud, 1U);
59 int delta = maxrate / divisor - baud;
60
61 if (baud > maxrate + baud / 50)
62 continue;
63
64 if (delta > baud / 50)
65 divisor++;
66
67 if (divisor > 0xffff)
68 continue;
69
70 /* Update delta due to possible divisor change */
71 delta = maxrate / divisor - baud;
72 if (abs(delta) < baud / 50) {
73 struct uart_8250_port *up = up_to_u8250p(port);
74 int lcr = serial_port_in(port, UART_LCR);
75
76 serial_port_out(port, UART_LCR, lcr | UART_LCR_DLAB);
77 serial_dl_write(up, divisor);
78 serial_port_out(port, 2, 16 - scr);
79 serial_port_out(port, UART_LCR, lcr);
80 return;
81 }
82 }
83 }
84
pericom8250_probe(struct pci_dev * pdev,const struct pci_device_id * id)85 static int pericom8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
86 {
87 unsigned int nr, i, bar = 0, maxnr;
88 struct pericom8250 *pericom;
89 struct uart_8250_port uart;
90 int ret;
91
92 ret = pcim_enable_device(pdev);
93 if (ret)
94 return ret;
95
96 maxnr = pci_resource_len(pdev, bar) >> 3;
97
98 if (pdev->vendor == PCI_VENDOR_ID_PERICOM)
99 nr = pdev->device & 0x0f;
100 else if (pdev->vendor == PCI_VENDOR_ID_ACCESSIO)
101 nr = BIT(((pdev->device & 0x38) >> 3) - 1);
102 else
103 nr = 1;
104
105 pericom = devm_kzalloc(&pdev->dev, struct_size(pericom, line, nr), GFP_KERNEL);
106 if (!pericom)
107 return -ENOMEM;
108
109 pericom->virt = pcim_iomap(pdev, bar, 0);
110 if (!pericom->virt)
111 return -ENOMEM;
112
113 memset(&uart, 0, sizeof(uart));
114
115 uart.port.dev = &pdev->dev;
116 uart.port.irq = pdev->irq;
117 uart.port.private_data = pericom;
118 uart.port.iotype = UPIO_PORT;
119 uart.port.uartclk = 921600 * 16;
120 uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
121 uart.port.set_divisor = pericom_do_set_divisor;
122 for (i = 0; i < nr && i < maxnr; i++) {
123 unsigned int offset = (i == 3 && nr == 4) ? 0x38 : i * 0x8;
124
125 uart.port.iobase = pci_resource_start(pdev, bar) + offset;
126
127 dev_dbg(&pdev->dev, "Setup PCI port: port %lx, irq %d, type %d\n",
128 uart.port.iobase, uart.port.irq, uart.port.iotype);
129
130 pericom->line[i] = serial8250_register_8250_port(&uart);
131 if (pericom->line[i] < 0) {
132 dev_err(&pdev->dev,
133 "Couldn't register serial port %lx, irq %d, type %d, error %d\n",
134 uart.port.iobase, uart.port.irq,
135 uart.port.iotype, pericom->line[i]);
136 break;
137 }
138 }
139 pericom->nr = i;
140
141 pci_set_drvdata(pdev, pericom);
142 return 0;
143 }
144
pericom8250_remove(struct pci_dev * pdev)145 static void pericom8250_remove(struct pci_dev *pdev)
146 {
147 struct pericom8250 *pericom = pci_get_drvdata(pdev);
148 unsigned int i;
149
150 for (i = 0; i < pericom->nr; i++)
151 serial8250_unregister_port(pericom->line[i]);
152 }
153
154 static const struct pci_device_id pericom8250_pci_ids[] = {
155 /*
156 * Pericom PI7C9X795[1248] Uno/Dual/Quad/Octal UART
157 * (Only 7954 has an offset jump for port 4)
158 */
159 { PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7951) },
160 { PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7952) },
161 { PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7954) },
162 { PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7958) },
163
164 /*
165 * ACCES I/O Products quad
166 * (Only 7954 has an offset jump for port 4)
167 */
168 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SDB) },
169 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2S) },
170 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_4) },
171 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_4) },
172 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SDB) },
173 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4S) },
174 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_8) },
175 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_8) },
176 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_2DB) },
177 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_2) },
178 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4) },
179 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4DB) },
180 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_4) },
181 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_8) },
182 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SMDB) },
183 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2SM) },
184 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SM) },
185 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SMDB) },
186 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4SM) },
187 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_8SM) },
188 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_1) },
189 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_2) },
190 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_2) },
191 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_4) },
192 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_4) },
193 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2S) },
194 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4S) },
195 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_2) },
196 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_2) },
197 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_4) },
198 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_4) },
199 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2SM) },
200 { PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4SM) },
201 { }
202 };
203 MODULE_DEVICE_TABLE(pci, pericom8250_pci_ids);
204
205 static struct pci_driver pericom8250_pci_driver = {
206 .name = "8250_pericom",
207 .id_table = pericom8250_pci_ids,
208 .probe = pericom8250_probe,
209 .remove = pericom8250_remove,
210 };
211 module_pci_driver(pericom8250_pci_driver);
212
213 MODULE_LICENSE("GPL v2");
214 MODULE_DESCRIPTION("Pericom UART driver");
215