summaryrefslogtreecommitdiffstats
path: root/drivers/tty/serial/8250/8250_pericom.c
blob: 95ff10f25d58aa5c7e5db838b76a766245849f90 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
// SPDX-License-Identifier: GPL-2.0
/* Driver for Pericom UART */

#include <linux/bits.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/pci.h>

#include "8250.h"

#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SDB	0x1051
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2S	0x1053
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_4	0x105a
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_4	0x105b
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SDB	0x105c
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4S	0x105e
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_8	0x106a
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_8	0x106b
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_2DB	0x1091
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_2	0x1093
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4	0x1098
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4DB	0x1099
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_4	0x109b
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_8	0x10a9
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SMDB	0x10d1
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2SM	0x10d3
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SM	0x10d9
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SMDB	0x10da
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4SM	0x10dc
#define PCI_DEVICE_ID_ACCESSIO_PCIE_COM_8SM	0x10e9
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_1	0x1108
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_2	0x1110
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_2	0x1111
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_4	0x1118
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_4	0x1119
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2S	0x1152
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4S	0x115a
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_2	0x1190
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_2	0x1191
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_4	0x1198
#define PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_4	0x1199
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2SM	0x11d0
#define PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4SM	0x11d8

struct pericom8250 {
	void __iomem *virt;
	unsigned int nr;
	int line[];
};

static void pericom_do_set_divisor(struct uart_port *port, unsigned int baud,
				   unsigned int quot, unsigned int quot_frac)
{
	int scr;

	for (scr = 16; scr > 4; scr--) {
		unsigned int maxrate = port->uartclk / scr;
		unsigned int divisor = max(maxrate / baud, 1U);
		int delta = maxrate / divisor - baud;

		if (baud > maxrate + baud / 50)
			continue;

		if (delta > baud / 50)
			divisor++;

		if (divisor > 0xffff)
			continue;

		/* Update delta due to possible divisor change */
		delta = maxrate / divisor - baud;
		if (abs(delta) < baud / 50) {
			struct uart_8250_port *up = up_to_u8250p(port);
			int lcr = serial_port_in(port, UART_LCR);

			serial_port_out(port, UART_LCR, lcr | 0x80);
			serial_dl_write(up, divisor);
			serial_port_out(port, 2, 16 - scr);
			serial_port_out(port, UART_LCR, lcr);
			return;
		}
	}
}

static int pericom8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	unsigned int nr, i, bar = 0, maxnr;
	struct pericom8250 *pericom;
	struct uart_8250_port uart;
	int ret;

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

	maxnr = pci_resource_len(pdev, bar) >> 3;

	if (pdev->vendor == PCI_VENDOR_ID_PERICOM)
		nr = pdev->device & 0x0f;
	else if (pdev->vendor == PCI_VENDOR_ID_ACCESSIO)
		nr = BIT(((pdev->device & 0x38) >> 3) - 1);
	else
		nr = 1;

	pericom = devm_kzalloc(&pdev->dev, struct_size(pericom, line, nr), GFP_KERNEL);
	if (!pericom)
		return -ENOMEM;

	pericom->virt = pcim_iomap(pdev, bar, 0);
	if (!pericom->virt)
		return -ENOMEM;

	memset(&uart, 0, sizeof(uart));

	uart.port.dev = &pdev->dev;
	uart.port.irq = pdev->irq;
	uart.port.private_data = pericom;
	uart.port.iotype = UPIO_PORT;
	uart.port.uartclk = 921600 * 16;
	uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
	uart.port.set_divisor = pericom_do_set_divisor;
	for (i = 0; i < nr && i < maxnr; i++) {
		unsigned int offset = (i == 3 && nr == 4) ? 0x38 : i * 0x8;

		uart.port.iobase = pci_resource_start(pdev, bar) + offset;

		dev_dbg(&pdev->dev, "Setup PCI port: port %lx, irq %d, type %d\n",
			uart.port.iobase, uart.port.irq, uart.port.iotype);

		pericom->line[i] = serial8250_register_8250_port(&uart);
		if (pericom->line[i] < 0) {
			dev_err(&pdev->dev,
				"Couldn't register serial port %lx, irq %d, type %d, error %d\n",
				uart.port.iobase, uart.port.irq,
				uart.port.iotype, pericom->line[i]);
			break;
		}
	}
	pericom->nr = i;

	pci_set_drvdata(pdev, pericom);
	return 0;
}

static void pericom8250_remove(struct pci_dev *pdev)
{
	struct pericom8250 *pericom = pci_get_drvdata(pdev);
	unsigned int i;

	for (i = 0; i < pericom->nr; i++)
		serial8250_unregister_port(pericom->line[i]);
}

static const struct pci_device_id pericom8250_pci_ids[] = {
	/*
	 * Pericom PI7C9X795[1248] Uno/Dual/Quad/Octal UART
	 * (Only 7954 has an offset jump for port 4)
	 */
	{ PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7951) },
	{ PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7952) },
	{ PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7954) },
	{ PCI_VDEVICE(PERICOM, PCI_DEVICE_ID_PERICOM_PI7C9X7958) },

	/*
	 * ACCES I/O Products quad
	 * (Only 7954 has an offset jump for port 4)
	 */
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SDB) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2S) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_4) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_4) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SDB) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4S) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM422_8) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM485_8) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_2DB) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_2) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_4DB) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM232_4) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM232_8) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_2SMDB) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_2SM) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SM) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_4SMDB) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_COM_4SM) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_COM_8SM) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_1) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_2) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_2) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM422_4) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM485_4) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2S) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4S) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_2) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_2) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM232_4) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_MPCIE_ICM232_4) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_2SM) },
	{ PCI_VDEVICE(ACCESSIO, PCI_DEVICE_ID_ACCESSIO_PCIE_ICM_4SM) },
	{ }
};
MODULE_DEVICE_TABLE(pci, pericom8250_pci_ids);

static struct pci_driver pericom8250_pci_driver = {
	.name           = "8250_pericom",
	.id_table       = pericom8250_pci_ids,
	.probe          = pericom8250_probe,
	.remove         = pericom8250_remove,
};
module_pci_driver(pericom8250_pci_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Pericom UART driver");