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uart: Split out initilisation of the acpi devinfo

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Split out the common parts of building the uart devinfo from ACPI
tables from the SPCR parser. This will be used when we support the DBG2
table to find the debug uart to be used by the kernel gdb stub.

Reviewed by:	imp
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D44357

(cherry picked from commit 473c0b44ae8c51b2aebc51887714b2ed14de50bf)
This commit is contained in:
Andrew Turner 2024-03-12 18:06:18 +00:00
parent bdbb0be043
commit f48bd7527b
1 changed files with 72 additions and 60 deletions
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132
sys/dev/uart/uart_cpu_acpi.c
View file

@ -70,6 +70,75 @@ uart_cpu_acpi_scan(uint8_t interface_type)
return (NULL);
}
static int
uart_cpu_acpi_init_devinfo(struct uart_devinfo *di, struct uart_class *class,
ACPI_GENERIC_ADDRESS *addr)
{
/* Fill in some fixed details. */
di->bas.chan = 0;
di->bas.rclk = 0;
di->databits = 8;
di->stopbits = 1;
di->parity = UART_PARITY_NONE;
di->ops = uart_getops(class);
/* Fill in details from SPCR table. */
switch (addr->SpaceId) {
case 0:
di->bas.bst = uart_bus_space_mem;
break;
case 1:
di->bas.bst = uart_bus_space_io;
break;
default:
printf("UART in unrecognized address space: %d!\n",
(int)addr->SpaceId);
return (ENXIO);
}
switch (addr->AccessWidth) {
case 0: /* EFI_ACPI_6_0_UNDEFINED */
/* FALLTHROUGH */
case 1: /* EFI_ACPI_6_0_BYTE */
di->bas.regiowidth = 1;
break;
case 2: /* EFI_ACPI_6_0_WORD */
di->bas.regiowidth = 2;
break;
case 3: /* EFI_ACPI_6_0_DWORD */
di->bas.regiowidth = 4;
break;
case 4: /* EFI_ACPI_6_0_QWORD */
di->bas.regiowidth = 8;
break;
default:
printf("UART unsupported access width: %d!\n",
(int)addr->AccessWidth);
return (ENXIO);
}
switch (addr->BitWidth) {
case 0:
/* FALLTHROUGH */
case 8:
di->bas.regshft = 0;
break;
case 16:
di->bas.regshft = 1;
break;
case 32:
di->bas.regshft = 2;
break;
case 64:
di->bas.regshft = 3;
break;
default:
printf("UART unsupported bit width: %d!\n",
(int)addr->BitWidth);
return (ENXIO);
}
return (0);
}
int
uart_cpu_acpi_spcr(int devtype, struct uart_devinfo *di)
{
@ -99,67 +168,10 @@ uart_cpu_acpi_spcr(int devtype, struct uart_devinfo *di)
goto out;
class = cd->cd_class;
/* Fill in some fixed details. */
di->bas.chan = 0;
di->bas.rclk = 0;
di->databits = 8;
di->stopbits = 1;
di->parity = UART_PARITY_NONE;
di->ops = uart_getops(class);
error = uart_cpu_acpi_init_devinfo(di, class, &spcr->SerialPort);
if (error != 0)
goto out;
/* Fill in details from SPCR table. */
switch (spcr->SerialPort.SpaceId) {
case 0:
di->bas.bst = uart_bus_space_mem;
break;
case 1:
di->bas.bst = uart_bus_space_io;
break;
default:
printf("UART in unrecognized address space: %d!\n",
(int)spcr->SerialPort.SpaceId);
goto out;
}
switch (spcr->SerialPort.AccessWidth) {
case 0: /* EFI_ACPI_6_0_UNDEFINED */
/* FALLTHROUGH */
case 1: /* EFI_ACPI_6_0_BYTE */
di->bas.regiowidth = 1;
break;
case 2: /* EFI_ACPI_6_0_WORD */
di->bas.regiowidth = 2;
break;
case 3: /* EFI_ACPI_6_0_DWORD */
di->bas.regiowidth = 4;
break;
case 4: /* EFI_ACPI_6_0_QWORD */
di->bas.regiowidth = 8;
break;
default:
printf("UART unsupported access width: %d!\n",
(int)spcr->SerialPort.AccessWidth);
goto out;
}
switch (spcr->SerialPort.BitWidth) {
case 0:
/* FALLTHROUGH */
case 8:
di->bas.regshft = 0;
break;
case 16:
di->bas.regshft = 1;
break;
case 32:
di->bas.regshft = 2;
break;
case 64:
di->bas.regshft = 3;
break;
default:
printf("UART unsupported bit width: %d!\n",
(int)spcr->SerialPort.BitWidth);
goto out;
}
switch (spcr->BaudRate) {
case 0:
/* Special value; means "keep current value unchanged". */