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 | |
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(up: port); |
74 | int lcr = serial_port_in(up: port, UART_LCR); |
75 | |
76 | serial_port_out(up: port, UART_LCR, value: lcr | UART_LCR_DLAB); |
77 | serial_dl_write(up, value: divisor); |
78 | serial_port_out(up: port, offset: 2, value: 16 - scr); |
79 | serial_port_out(up: port, UART_LCR, value: lcr); |
80 | return; |
81 | } |
82 | } |
83 | } |
84 | |
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(dev: &pdev->dev, struct_size(pericom, line, nr), GFP_KERNEL); |
106 | if (!pericom) |
107 | return -ENOMEM; |
108 | |
109 | pericom->virt = pcim_iomap(pdev, bar, maxlen: 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, data: pericom); |
142 | return 0; |
143 | } |
144 | |
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(line: 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 | |