1 /*
2 * Copyright 2011, Netlogic Microsystems.
3 * Copyright 2004, Matt Porter <mporter@kernel.crashing.org>
4 *
5 * This file is licensed under the terms of the GNU General Public
6 * License version 2. This program is licensed "as is" without any
7 * warranty of any kind, whether express or implied.
8 */
9
10 #include <linux/device.h>
11 #include <linux/platform_device.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/resource.h>
15 #include <linux/serial_8250.h>
16 #include <linux/serial_reg.h>
17
18 #include <asm/netlogic/haldefs.h>
19 #include <asm/netlogic/xlr/iomap.h>
20 #include <asm/netlogic/xlr/pic.h>
21 #include <asm/netlogic/xlr/xlr.h>
22
nlm_xlr_uart_in(struct uart_port * p,int offset)23 unsigned int nlm_xlr_uart_in(struct uart_port *p, int offset)
24 {
25 uint64_t uartbase;
26 unsigned int value;
27
28 /* sign extend to 64 bits, if needed */
29 uartbase = (uint64_t)(long)p->membase;
30 value = nlm_read_reg(uartbase, offset);
31
32 /* See XLR/XLS errata */
33 if (offset == UART_MSR)
34 value ^= 0xF0;
35 else if (offset == UART_MCR)
36 value ^= 0x3;
37
38 return value;
39 }
40
nlm_xlr_uart_out(struct uart_port * p,int offset,int value)41 void nlm_xlr_uart_out(struct uart_port *p, int offset, int value)
42 {
43 uint64_t uartbase;
44
45 /* sign extend to 64 bits, if needed */
46 uartbase = (uint64_t)(long)p->membase;
47
48 /* See XLR/XLS errata */
49 if (offset == UART_MSR)
50 value ^= 0xF0;
51 else if (offset == UART_MCR)
52 value ^= 0x3;
53
54 nlm_write_reg(uartbase, offset, value);
55 }
56
57 #define PORT(_irq) \
58 { \
59 .irq = _irq, \
60 .regshift = 2, \
61 .iotype = UPIO_MEM32, \
62 .flags = (UPF_SKIP_TEST | \
63 UPF_FIXED_TYPE | UPF_BOOT_AUTOCONF),\
64 .uartclk = PIC_CLKS_PER_SEC, \
65 .type = PORT_16550A, \
66 .serial_in = nlm_xlr_uart_in, \
67 .serial_out = nlm_xlr_uart_out, \
68 }
69
70 static struct plat_serial8250_port xlr_uart_data[] = {
71 PORT(PIC_UART_0_IRQ),
72 PORT(PIC_UART_1_IRQ),
73 {},
74 };
75
76 static struct platform_device uart_device = {
77 .name = "serial8250",
78 .id = PLAT8250_DEV_PLATFORM,
79 .dev = {
80 .platform_data = xlr_uart_data,
81 },
82 };
83
nlm_uart_init(void)84 static int __init nlm_uart_init(void)
85 {
86 unsigned long uartbase;
87
88 uartbase = (unsigned long)nlm_mmio_base(NETLOGIC_IO_UART_0_OFFSET);
89 xlr_uart_data[0].membase = (void __iomem *)uartbase;
90 xlr_uart_data[0].mapbase = CPHYSADDR(uartbase);
91
92 uartbase = (unsigned long)nlm_mmio_base(NETLOGIC_IO_UART_1_OFFSET);
93 xlr_uart_data[1].membase = (void __iomem *)uartbase;
94 xlr_uart_data[1].mapbase = CPHYSADDR(uartbase);
95
96 return platform_device_register(&uart_device);
97 }
98
99 arch_initcall(nlm_uart_init);
100