72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
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#include <kernel/printf.h>
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#include <kernel/types.h>
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#include <kernel/video.h>
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#include <kernel/pci.h>
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#include <kernel/mmu.h>
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#include <kernel/vfs.h>
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#include <kernel/args.h>
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extern uint32_t lfb_resolution_s;
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extern fs_node_t * lfb_device;
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static uintptr_t ctrl_regs = 0;
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static uint32_t i965_mmio_read(uint32_t reg) {
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return *(volatile uint32_t*)(ctrl_regs + reg);
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}
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static void i965_mmio_write(uint32_t reg, uint32_t val) {
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*(volatile uint32_t*)(ctrl_regs + reg) = val;
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}
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static void split(uint32_t val, uint32_t * a, uint32_t * b) {
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*a = (val & 0xFFFF) + 1;
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*b = (val >> 16) + 1;
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}
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static void setup_framebuffer(uint32_t pcidev) {
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/* Map BAR space for the control registers */
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uint32_t ctrl_space = pci_read_field(pcidev, PCI_BAR0, 4);
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pci_write_field(pcidev, PCI_BAR0, 4, 0xFFFFFFFF);
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uint32_t ctrl_size = pci_read_field(pcidev, PCI_BAR0, 4);
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ctrl_size = ~(ctrl_size & -15) + 1;
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pci_write_field(pcidev, PCI_BAR0, 4, ctrl_space);
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ctrl_space &= 0xFFFFFF00;
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ctrl_regs = (uintptr_t)mmu_map_mmio_region(ctrl_space, ctrl_size);
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/* Disable pipe A while we update source size */
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uint32_t pipe = i965_mmio_read(0x70008);
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i965_mmio_write(0x70008, pipe & ~(1 << 31));
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while (i965_mmio_read(0x70008) & (1 << 30));
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/* Set source size */
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i965_mmio_write(0x6001c, ((1440 - 1) << 16) | (900 - 1));
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/* Re-enable pipe */
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pipe = i965_mmio_read(0x70008);
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i965_mmio_write(0x70008, pipe | (1 << 31));
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while (!(i965_mmio_read(0x70008) & (1 << 30)));
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/* Keep the plane enabled while we update stride value */
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i965_mmio_write(0x70184, 0);
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i965_mmio_write(0x70188, 1440 * 4);
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i965_mmio_write(0x7019c, 0);
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/* Update the values we expose to userspace. */
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lfb_resolution_x = 1440;
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lfb_resolution_y = 900;
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lfb_resolution_b = 32;
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lfb_resolution_s = i965_mmio_read(0x70188);
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lfb_device->length = lfb_resolution_s * lfb_resolution_y;
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}
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static void find_intel(uint32_t device, uint16_t v, uint16_t d, void * extra) {
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if (v == 0x8086 && d == 0x0046) {
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setup_framebuffer(device);
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}
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}
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void i965_initialize(void) {
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if (args_present("noi965")) return;
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pci_scan(find_intel, -1, NULL);
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}
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