diff options
| -rw-r--r-- | drivers/video/fbdev/sm712.h | 5 | ||||
| -rw-r--r-- | drivers/video/fbdev/sm712fb.c | 48 |
2 files changed, 44 insertions, 9 deletions
diff --git a/drivers/video/fbdev/sm712.h b/drivers/video/fbdev/sm712.h index aad1cc4be34a..2cba1e73ed24 100644 --- a/drivers/video/fbdev/sm712.h +++ b/drivers/video/fbdev/sm712.h @@ -19,11 +19,6 @@ #define SCREEN_Y_RES 600 #define SCREEN_BPP 16 -/*Assume SM712 graphics chip has 4MB VRAM */ -#define SM712_VIDEOMEMORYSIZE 0x00400000 -/*Assume SM722 graphics chip has 8MB VRAM */ -#define SM722_VIDEOMEMORYSIZE 0x00800000 - #define dac_reg (0x3c8) #define dac_val (0x3c9) diff --git a/drivers/video/fbdev/sm712fb.c b/drivers/video/fbdev/sm712fb.c index e8149f0f47d5..52234c57be02 100644 --- a/drivers/video/fbdev/sm712fb.c +++ b/drivers/video/fbdev/sm712fb.c @@ -1329,6 +1329,11 @@ static int smtc_map_smem(struct smtcfb_info *sfb, { sfb->fb->fix.smem_start = pci_resource_start(pdev, 0); + if (sfb->chip_id == 0x720) + /* on SM720, the framebuffer starts at the 1 MB offset */ + sfb->fb->fix.smem_start += 0x00200000; + + /* XXX: is it safe for SM720 on Big-Endian? */ if (sfb->fb->var.bits_per_pixel == 32) sfb->fb->fix.smem_start += big_addr; @@ -1366,12 +1371,45 @@ static inline void sm7xx_init_hw(void) outb_p(0x11, 0x3c5); } +static u_long sm7xx_vram_probe(struct smtcfb_info *sfb) +{ + u8 vram; + + switch (sfb->chip_id) { + case 0x710: + case 0x712: + /* + * Assume SM712 graphics chip has 4MB VRAM. + * + * FIXME: SM712 can have 2MB VRAM, which is used on earlier + * laptops, such as IBM Thinkpad 240X. This driver would + * probably crash on those machines. If anyone gets one of + * those and is willing to help, run "git blame" and send me + * an E-mail. + */ + return 0x00400000; + case 0x720: + outb_p(0x76, 0x3c4); + vram = inb_p(0x3c5) >> 6; + + if (vram == 0x00) + return 0x00800000; /* 8 MB */ + else if (vram == 0x01) + return 0x01000000; /* 16 MB */ + else if (vram == 0x02) + return 0x00400000; /* illegal, fallback to 4 MB */ + else if (vram == 0x03) + return 0x00400000; /* 4 MB */ + } + return 0; /* unknown hardware */ +} + static int smtcfb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct smtcfb_info *sfb; struct fb_info *info; - u_long smem_size = 0x00800000; /* default 8MB */ + u_long smem_size; int err; unsigned long mmio_base; @@ -1428,12 +1466,15 @@ static int smtcfb_pci_probe(struct pci_dev *pdev, mmio_base = pci_resource_start(pdev, 0); pci_read_config_byte(pdev, PCI_REVISION_ID, &sfb->chip_rev_id); + smem_size = sm7xx_vram_probe(sfb); + dev_info(&pdev->dev, "%lu MiB of VRAM detected.\n", + smem_size / 1048576); + switch (sfb->chip_id) { case 0x710: case 0x712: sfb->fb->fix.mmio_start = mmio_base + 0x00400000; sfb->fb->fix.mmio_len = 0x00400000; - smem_size = SM712_VIDEOMEMORYSIZE; sfb->lfb = ioremap(mmio_base, mmio_addr); if (!sfb->lfb) { dev_err(&pdev->dev, @@ -1465,8 +1506,7 @@ static int smtcfb_pci_probe(struct pci_dev *pdev, case 0x720: sfb->fb->fix.mmio_start = mmio_base; sfb->fb->fix.mmio_len = 0x00200000; - smem_size = SM722_VIDEOMEMORYSIZE; - sfb->dp_regs = ioremap(mmio_base, 0x00a00000); + sfb->dp_regs = ioremap(mmio_base, 0x00200000 + smem_size); sfb->lfb = sfb->dp_regs + 0x00200000; sfb->mmio = (smtc_regbaseaddress = sfb->dp_regs + 0x000c0000); |