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x86: early_serial: use device_map()

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This driver code uses PCIe and doesn't use Zephyr's
device model, so we can't use the nice DEVICE_MMIO macros.
Set stuff up manually instead using device_map().

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2020-06-26 11:56:10 -07:00 • committed by Carles Cufí
commit a810c7b5a0
1 changed files with 26 additions and 13 deletions
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39
arch/x86/core/early_serial.c
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@ -5,32 +5,38 @@
*/
#include <kernel.h>
#include <sys/device_mmio.h>
#include <sys/util.h>
#include <drivers/pcie/pcie.h>
#include <soc.h>
/* Legacy I/O Port Access to a NS16550 UART */
#ifdef UART_NS16550_ACCESS_IOPORT
/* Legacy I/O Port Access to a NS16550 UART */
#define IN(reg) sys_in8(reg + UART_NS16550_ACCESS_IOPORT)
#define OUT(reg, val) sys_out8(val, reg + UART_NS16550_ACCESS_IOPORT)
#endif
#elif defined(X86_SOC_EARLY_SERIAL_PCIDEV)
/* "Modern" mapping of a UART into a PCI MMIO device. The registers
* are still bytes, but spaced at a 32 bit stride instead of packed
* together.
*/
#ifdef X86_SOC_EARLY_SERIAL_PCIDEV
static uintptr_t pci_bar;
#define IN(reg) (sys_read32(pci_bar + reg * 4) & 0xff)
#define OUT(reg, val) sys_write32((val) & 0xff, pci_bar + reg * 4)
#endif
static mm_reg_t mmio;
#define IN(reg) (sys_read32(mmio + reg * 4) & 0xff)
#define OUT(reg, val) sys_write32((val) & 0xff, mmio + reg * 4)
#elif defined(X86_SOC_EARLY_SERIAL_MMIO8_ADDR)
/* Still other devices use a MMIO region containing packed byte
* registers
*/
#ifdef X86_SOC_EARLY_SERIAL_MMIO8_ADDR
#define IN(reg) sys_read8(X86_SOC_EARLY_SERIAL_MMIO8_ADDR + reg)
#define OUT(reg, val) sys_write8(val, X86_SOC_EARLY_SERIAL_MMIO8_ADDR + reg)
#if DEVICE_MMIO_IS_IN_RAM
static mm_reg_t mmio;
#define BASE mmio
#else
#define BASE X86_SOC_EARLY_SERIAL_MMIO8_ADDR
#endif /* DEVICE_MMIO_IS_IN_RAM */
#define IN(reg) sys_read8(BASE + reg)
#define OUT(reg, val) sys_write8(val, BASE + reg)
#else
#error "Unsupported configuration"
#endif
#define REG_THR 0x00 /* Transmitter holding reg. */
@ -72,10 +78,17 @@ int arch_printk_char_out(int c)
void z_x86_early_serial_init(void)
{
#if defined(DEVICE_MMIO_IS_IN_RAM) && !defined(UART_NS16550_ACCESS_IOPORT)
uintptr_t phys;
#ifdef X86_SOC_EARLY_SERIAL_PCIDEV
pci_bar = pcie_get_mbar(X86_SOC_EARLY_SERIAL_PCIDEV, 0);
phys = pcie_get_mbar(X86_SOC_EARLY_SERIAL_PCIDEV, 0);
pcie_set_cmd(X86_SOC_EARLY_SERIAL_PCIDEV, PCIE_CONF_CMDSTAT_MEM, true);
#else
phys = X86_SOC_EARLY_SERIAL_MMIO8_ADDR;
#endif
device_map(&mmio, phys, 0x1000, K_MEM_CACHE_NONE);
#endif /* DEVICE_MMIO_IS_IN_RAM */
OUT(REG_IER, IER_DISABLE); /* Disable interrupts */
OUT(REG_LCR, LCR_DLAB_SELECT); /* DLAB select */