mach64_ct.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:7k
- /*
- * ATI Mach64 CT/VT/GT/LT Support
- */
- #include <linux/fb.h>
- #include <asm/io.h>
- #include <video/fbcon.h>
- #include "mach64.h"
- #include "atyfb.h"
- /* FIXME: remove the FAIL definition */
- #define FAIL(x) do { printk(x "n"); return -EINVAL; } while (0)
- static void aty_st_pll(int offset, u8 val, const struct fb_info_aty *info);
- static int aty_valid_pll_ct(const struct fb_info_aty *info, u32 vclk_per,
- struct pll_ct *pll);
- static int aty_dsp_gt(const struct fb_info_aty *info, u8 bpp,
- struct pll_ct *pll);
- static int aty_var_to_pll_ct(const struct fb_info_aty *info, u32 vclk_per,
- u8 bpp, union aty_pll *pll);
- static u32 aty_pll_ct_to_var(const struct fb_info_aty *info,
- const union aty_pll *pll);
- static void aty_st_pll(int offset, u8 val, const struct fb_info_aty *info)
- {
- /* write addr byte */
- aty_st_8(CLOCK_CNTL + 1, (offset << 2) | PLL_WR_EN, info);
- /* write the register value */
- aty_st_8(CLOCK_CNTL + 2, val, info);
- aty_st_8(CLOCK_CNTL + 1, (offset << 2) & ~PLL_WR_EN, info);
- }
- /* ------------------------------------------------------------------------- */
- /*
- * PLL programming (Mach64 CT family)
- */
- static int aty_dsp_gt(const struct fb_info_aty *info, u8 bpp,
- struct pll_ct *pll)
- {
- u32 dsp_xclks_per_row, dsp_loop_latency, dsp_precision, dsp_off, dsp_on;
- u32 xclks_per_row, fifo_off, fifo_on, y, fifo_size, page_size;
- /* xclocks_per_row<<11 */
- xclks_per_row = (pll->mclk_fb_div*pll->vclk_post_div_real*64<<11)/
- (pll->vclk_fb_div*pll->mclk_post_div_real*bpp);
- if (xclks_per_row < (1<<11))
- FAIL("Dotclock to high");
- if (M64_HAS(FIFO_24)) {
- fifo_size = 24;
- dsp_loop_latency = 0;
- } else {
- fifo_size = 32;
- dsp_loop_latency = 2;
- }
- dsp_precision = 0;
- y = (xclks_per_row*fifo_size)>>11;
- while (y) {
- y >>= 1;
- dsp_precision++;
- }
- dsp_precision -= 5;
- /* fifo_off<<6 */
- fifo_off = ((xclks_per_row*(fifo_size-1))>>5)+(3<<6);
- if (info->total_vram > 1*1024*1024) {
- if (info->ram_type >= SDRAM) {
- /* >1 MB SDRAM */
- dsp_loop_latency += 8;
- page_size = 8;
- } else {
- /* >1 MB DRAM */
- dsp_loop_latency += 6;
- page_size = 9;
- }
- } else {
- if (info->ram_type >= SDRAM) {
- /* <2 MB SDRAM */
- dsp_loop_latency += 9;
- page_size = 10;
- } else {
- /* <2 MB DRAM */
- dsp_loop_latency += 8;
- page_size = 10;
- }
- }
- /* fifo_on<<6 */
- if (xclks_per_row >= (page_size<<11))
- fifo_on = ((2*page_size+1)<<6)+(xclks_per_row>>5);
- else
- fifo_on = (3*page_size+2)<<6;
- dsp_xclks_per_row = xclks_per_row>>dsp_precision;
- dsp_on = fifo_on>>dsp_precision;
- dsp_off = fifo_off>>dsp_precision;
- pll->dsp_config = (dsp_xclks_per_row & 0x3fff) |
- ((dsp_loop_latency & 0xf)<<16) |
- ((dsp_precision & 7)<<20);
- pll->dsp_on_off = (dsp_on & 0x7ff) | ((dsp_off & 0x7ff)<<16);
- return 0;
- }
- static int aty_valid_pll_ct(const struct fb_info_aty *info, u32 vclk_per,
- struct pll_ct *pll)
- {
- u32 q, x; /* x is a workaround for sparc64-linux-gcc */
- x = x; /* x is a workaround for sparc64-linux-gcc */
- pll->pll_ref_div = info->pll_per*2*255/info->ref_clk_per;
- /* FIXME: use the VTB/GTB /3 post divider if it's better suited */
- q = info->ref_clk_per*pll->pll_ref_div*4/info->mclk_per; /* actually 8*q */
- if (q < 16*8 || q > 255*8)
- FAIL("mclk out of range");
- else if (q < 32*8)
- pll->mclk_post_div_real = 8;
- else if (q < 64*8)
- pll->mclk_post_div_real = 4;
- else if (q < 128*8)
- pll->mclk_post_div_real = 2;
- else
- pll->mclk_post_div_real = 1;
- pll->mclk_fb_div = q*pll->mclk_post_div_real/8;
- /* FIXME: use the VTB/GTB /{3,6,12} post dividers if they're better suited */
- q = info->ref_clk_per*pll->pll_ref_div*4/vclk_per; /* actually 8*q */
- if (q < 16*8 || q > 255*8)
- FAIL("vclk out of range");
- else if (q < 32*8)
- pll->vclk_post_div_real = 8;
- else if (q < 64*8)
- pll->vclk_post_div_real = 4;
- else if (q < 128*8)
- pll->vclk_post_div_real = 2;
- else
- pll->vclk_post_div_real = 1;
- pll->vclk_fb_div = q*pll->vclk_post_div_real/8;
- return 0;
- }
- void aty_calc_pll_ct(const struct fb_info_aty *info, struct pll_ct *pll)
- {
- u8 mpostdiv = 0;
- u8 vpostdiv = 0;
- if (M64_HAS(SDRAM_MAGIC_PLL) && (info->ram_type >= SDRAM))
- pll->pll_gen_cntl = 0x04;
- else
- pll->pll_gen_cntl = 0x84;
- switch (pll->mclk_post_div_real) {
- case 1:
- mpostdiv = 0;
- break;
- case 2:
- mpostdiv = 1;
- break;
- case 3:
- mpostdiv = 4;
- break;
- case 4:
- mpostdiv = 2;
- break;
- case 8:
- mpostdiv = 3;
- break;
- }
- pll->pll_gen_cntl |= mpostdiv<<4; /* mclk */
- if (M64_HAS(MAGIC_POSTDIV))
- pll->pll_ext_cntl = 0;
- else
- pll->pll_ext_cntl = mpostdiv; /* xclk == mclk */
- switch (pll->vclk_post_div_real) {
- case 2:
- vpostdiv = 1;
- break;
- case 3:
- pll->pll_ext_cntl |= 0x10;
- case 1:
- vpostdiv = 0;
- break;
- case 6:
- pll->pll_ext_cntl |= 0x10;
- case 4:
- vpostdiv = 2;
- break;
- case 12:
- pll->pll_ext_cntl |= 0x10;
- case 8:
- vpostdiv = 3;
- break;
- }
- pll->pll_vclk_cntl = 0x03; /* VCLK = PLL_VCLK/VCLKx_POST */
- pll->vclk_post_div = vpostdiv;
- }
- static int aty_var_to_pll_ct(const struct fb_info_aty *info, u32 vclk_per,
- u8 bpp, union aty_pll *pll)
- {
- int err;
- if ((err = aty_valid_pll_ct(info, vclk_per, &pll->ct)))
- return err;
- if (M64_HAS(GTB_DSP) && (err = aty_dsp_gt(info, bpp, &pll->ct)))
- return err;
- aty_calc_pll_ct(info, &pll->ct);
- return 0;
- }
- static u32 aty_pll_ct_to_var(const struct fb_info_aty *info,
- const union aty_pll *pll)
- {
- u32 ref_clk_per = info->ref_clk_per;
- u8 pll_ref_div = pll->ct.pll_ref_div;
- u8 vclk_fb_div = pll->ct.vclk_fb_div;
- u8 vclk_post_div = pll->ct.vclk_post_div_real;
- return ref_clk_per*pll_ref_div*vclk_post_div/vclk_fb_div/2;
- }
- void aty_set_pll_ct(const struct fb_info_aty *info, const union aty_pll *pll)
- {
- aty_st_pll(PLL_REF_DIV, pll->ct.pll_ref_div, info);
- aty_st_pll(PLL_GEN_CNTL, pll->ct.pll_gen_cntl, info);
- aty_st_pll(MCLK_FB_DIV, pll->ct.mclk_fb_div, info);
- aty_st_pll(PLL_VCLK_CNTL, pll->ct.pll_vclk_cntl, info);
- aty_st_pll(VCLK_POST_DIV, pll->ct.vclk_post_div, info);
- aty_st_pll(VCLK0_FB_DIV, pll->ct.vclk_fb_div, info);
- aty_st_pll(PLL_EXT_CNTL, pll->ct.pll_ext_cntl, info);
- if (M64_HAS(GTB_DSP)) {
- if (M64_HAS(XL_DLL))
- aty_st_pll(DLL_CNTL, 0x80, info);
- else if (info->ram_type >= SDRAM)
- aty_st_pll(DLL_CNTL, 0xa6, info);
- else
- aty_st_pll(DLL_CNTL, 0xa0, info);
- aty_st_pll(VFC_CNTL, 0x1b, info);
- aty_st_le32(DSP_CONFIG, pll->ct.dsp_config, info);
- aty_st_le32(DSP_ON_OFF, pll->ct.dsp_on_off, info);
- }
- }
- static int dummy(void)
- {
- return 0;
- }
- const struct aty_dac_ops aty_dac_ct = {
- set_dac: (void *)dummy,
- };
- const struct aty_pll_ops aty_pll_ct = {
- var_to_pll: aty_var_to_pll_ct,
- pll_to_var: aty_pll_ct_to_var,
- set_pll: aty_set_pll_ct,
- };