arch/mips/netlogic/xlr/platform.c

   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
  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
  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
  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);