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411 lines
10 KiB
411 lines
10 KiB
/* |
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* linux/drivers/video/pmagb-b-fb.c |
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* |
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* PMAGB-B TURBOchannel Smart Frame Buffer (SFB) card support, |
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* derived from: |
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* "HP300 Topcat framebuffer support (derived from macfb of all things) |
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* Phil Blundell <[email protected]> 1998", the original code can be |
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* found in the file hpfb.c in the same directory. |
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* |
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* DECstation related code Copyright (C) 1999, 2000, 2001 by |
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* Michael Engel <[email protected]>, |
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* Karsten Merker <[email protected]> and |
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* Harald Koerfgen. |
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* Copyright (c) 2005, 2006 Maciej W. Rozycki |
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* |
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* This file is subject to the terms and conditions of the GNU General |
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* Public License. See the file COPYING in the main directory of this |
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* archive for more details. |
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*/ |
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#include <linux/compiler.h> |
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#include <linux/delay.h> |
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#include <linux/errno.h> |
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#include <linux/fb.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/tc.h> |
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#include <linux/types.h> |
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#include <asm/io.h> |
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#include <video/pmagb-b-fb.h> |
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struct pmagbbfb_par { |
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volatile void __iomem *mmio; |
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volatile void __iomem *smem; |
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volatile u32 __iomem *sfb; |
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volatile u32 __iomem *dac; |
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unsigned int osc0; |
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unsigned int osc1; |
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int slot; |
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}; |
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static const struct fb_var_screeninfo pmagbbfb_defined = { |
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.bits_per_pixel = 8, |
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.red.length = 8, |
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.green.length = 8, |
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.blue.length = 8, |
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.activate = FB_ACTIVATE_NOW, |
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.height = -1, |
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.width = -1, |
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.accel_flags = FB_ACCEL_NONE, |
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.sync = FB_SYNC_ON_GREEN, |
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.vmode = FB_VMODE_NONINTERLACED, |
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}; |
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static const struct fb_fix_screeninfo pmagbbfb_fix = { |
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.id = "PMAGB-BA", |
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.smem_len = (2048 * 1024), |
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.type = FB_TYPE_PACKED_PIXELS, |
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.visual = FB_VISUAL_PSEUDOCOLOR, |
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.mmio_len = PMAGB_B_FBMEM, |
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}; |
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static inline void sfb_write(struct pmagbbfb_par *par, unsigned int reg, u32 v) |
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{ |
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writel(v, par->sfb + reg / 4); |
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} |
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static inline u32 sfb_read(struct pmagbbfb_par *par, unsigned int reg) |
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{ |
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return readl(par->sfb + reg / 4); |
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} |
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static inline void dac_write(struct pmagbbfb_par *par, unsigned int reg, u8 v) |
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{ |
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writeb(v, par->dac + reg / 4); |
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} |
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static inline u8 dac_read(struct pmagbbfb_par *par, unsigned int reg) |
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{ |
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return readb(par->dac + reg / 4); |
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} |
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static inline void gp0_write(struct pmagbbfb_par *par, u32 v) |
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{ |
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writel(v, par->mmio + PMAGB_B_GP0); |
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} |
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/* |
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* Set the palette. |
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*/ |
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static int pmagbbfb_setcolreg(unsigned int regno, unsigned int red, |
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unsigned int green, unsigned int blue, |
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unsigned int transp, struct fb_info *info) |
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{ |
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struct pmagbbfb_par *par = info->par; |
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if (regno >= info->cmap.len) |
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return 1; |
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red >>= 8; /* The cmap fields are 16 bits */ |
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green >>= 8; /* wide, but the hardware colormap */ |
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blue >>= 8; /* registers are only 8 bits wide */ |
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mb(); |
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dac_write(par, BT459_ADDR_LO, regno); |
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dac_write(par, BT459_ADDR_HI, 0x00); |
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wmb(); |
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dac_write(par, BT459_CMAP, red); |
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wmb(); |
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dac_write(par, BT459_CMAP, green); |
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wmb(); |
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dac_write(par, BT459_CMAP, blue); |
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return 0; |
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} |
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static const struct fb_ops pmagbbfb_ops = { |
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.owner = THIS_MODULE, |
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.fb_setcolreg = pmagbbfb_setcolreg, |
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.fb_fillrect = cfb_fillrect, |
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.fb_copyarea = cfb_copyarea, |
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.fb_imageblit = cfb_imageblit, |
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}; |
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/* |
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* Turn the hardware cursor off. |
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*/ |
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static void pmagbbfb_erase_cursor(struct fb_info *info) |
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{ |
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struct pmagbbfb_par *par = info->par; |
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mb(); |
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dac_write(par, BT459_ADDR_LO, 0x00); |
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dac_write(par, BT459_ADDR_HI, 0x03); |
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wmb(); |
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dac_write(par, BT459_DATA, 0x00); |
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} |
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/* |
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* Set up screen parameters. |
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*/ |
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static void pmagbbfb_screen_setup(struct fb_info *info) |
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{ |
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struct pmagbbfb_par *par = info->par; |
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info->var.xres = ((sfb_read(par, SFB_REG_VID_HOR) >> |
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SFB_VID_HOR_PIX_SHIFT) & SFB_VID_HOR_PIX_MASK) * 4; |
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info->var.xres_virtual = info->var.xres; |
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info->var.yres = (sfb_read(par, SFB_REG_VID_VER) >> |
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SFB_VID_VER_SL_SHIFT) & SFB_VID_VER_SL_MASK; |
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info->var.yres_virtual = info->var.yres; |
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info->var.left_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> |
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SFB_VID_HOR_BP_SHIFT) & |
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SFB_VID_HOR_BP_MASK) * 4; |
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info->var.right_margin = ((sfb_read(par, SFB_REG_VID_HOR) >> |
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SFB_VID_HOR_FP_SHIFT) & |
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SFB_VID_HOR_FP_MASK) * 4; |
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info->var.upper_margin = (sfb_read(par, SFB_REG_VID_VER) >> |
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SFB_VID_VER_BP_SHIFT) & SFB_VID_VER_BP_MASK; |
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info->var.lower_margin = (sfb_read(par, SFB_REG_VID_VER) >> |
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SFB_VID_VER_FP_SHIFT) & SFB_VID_VER_FP_MASK; |
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info->var.hsync_len = ((sfb_read(par, SFB_REG_VID_HOR) >> |
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SFB_VID_HOR_SYN_SHIFT) & |
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SFB_VID_HOR_SYN_MASK) * 4; |
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info->var.vsync_len = (sfb_read(par, SFB_REG_VID_VER) >> |
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SFB_VID_VER_SYN_SHIFT) & SFB_VID_VER_SYN_MASK; |
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info->fix.line_length = info->var.xres; |
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}; |
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/* |
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* Determine oscillator configuration. |
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*/ |
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static void pmagbbfb_osc_setup(struct fb_info *info) |
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{ |
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static unsigned int pmagbbfb_freqs[] = { |
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130808, 119843, 104000, 92980, 74370, 72800, |
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69197, 66000, 65000, 50350, 36000, 32000, 25175 |
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}; |
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struct pmagbbfb_par *par = info->par; |
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struct tc_bus *tbus = to_tc_dev(info->device)->bus; |
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u32 count0 = 8, count1 = 8, counttc = 16 * 256 + 8; |
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u32 freq0, freq1, freqtc = tc_get_speed(tbus) / 250; |
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int i, j; |
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gp0_write(par, 0); /* select Osc0 */ |
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for (j = 0; j < 16; j++) { |
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mb(); |
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sfb_write(par, SFB_REG_TCCLK_COUNT, 0); |
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mb(); |
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for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ |
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if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) |
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break; |
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udelay(1); |
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} |
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count0 += sfb_read(par, SFB_REG_VIDCLK_COUNT); |
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} |
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gp0_write(par, 1); /* select Osc1 */ |
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for (j = 0; j < 16; j++) { |
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mb(); |
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sfb_write(par, SFB_REG_TCCLK_COUNT, 0); |
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for (i = 0; i < 100; i++) { /* nominally max. 20.5us */ |
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if (sfb_read(par, SFB_REG_TCCLK_COUNT) == 0) |
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break; |
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udelay(1); |
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} |
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count1 += sfb_read(par, SFB_REG_VIDCLK_COUNT); |
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} |
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freq0 = (freqtc * count0 + counttc / 2) / counttc; |
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par->osc0 = freq0; |
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if (freq0 >= pmagbbfb_freqs[0] - (pmagbbfb_freqs[0] + 32) / 64 && |
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freq0 <= pmagbbfb_freqs[0] + (pmagbbfb_freqs[0] + 32) / 64) |
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par->osc0 = pmagbbfb_freqs[0]; |
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freq1 = (par->osc0 * count1 + count0 / 2) / count0; |
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par->osc1 = freq1; |
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for (i = 0; i < ARRAY_SIZE(pmagbbfb_freqs); i++) |
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if (freq1 >= pmagbbfb_freqs[i] - |
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(pmagbbfb_freqs[i] + 128) / 256 && |
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freq1 <= pmagbbfb_freqs[i] + |
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(pmagbbfb_freqs[i] + 128) / 256) { |
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par->osc1 = pmagbbfb_freqs[i]; |
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break; |
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} |
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if (par->osc0 - par->osc1 <= (par->osc0 + par->osc1 + 256) / 512 || |
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par->osc1 - par->osc0 <= (par->osc0 + par->osc1 + 256) / 512) |
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par->osc1 = 0; |
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gp0_write(par, par->osc1 != 0); /* reselect OscX */ |
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info->var.pixclock = par->osc1 ? |
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(1000000000 + par->osc1 / 2) / par->osc1 : |
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(1000000000 + par->osc0 / 2) / par->osc0; |
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}; |
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static int pmagbbfb_probe(struct device *dev) |
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{ |
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struct tc_dev *tdev = to_tc_dev(dev); |
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resource_size_t start, len; |
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struct fb_info *info; |
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struct pmagbbfb_par *par; |
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char freq0[12], freq1[12]; |
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u32 vid_base; |
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int err; |
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info = framebuffer_alloc(sizeof(struct pmagbbfb_par), dev); |
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if (!info) |
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return -ENOMEM; |
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par = info->par; |
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dev_set_drvdata(dev, info); |
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if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { |
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printk(KERN_ERR "%s: Cannot allocate color map\n", |
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dev_name(dev)); |
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err = -ENOMEM; |
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goto err_alloc; |
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} |
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info->fbops = &pmagbbfb_ops; |
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info->fix = pmagbbfb_fix; |
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info->var = pmagbbfb_defined; |
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info->flags = FBINFO_DEFAULT; |
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/* Request the I/O MEM resource. */ |
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start = tdev->resource.start; |
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len = tdev->resource.end - start + 1; |
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if (!request_mem_region(start, len, dev_name(dev))) { |
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printk(KERN_ERR "%s: Cannot reserve FB region\n", |
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dev_name(dev)); |
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err = -EBUSY; |
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goto err_cmap; |
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} |
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/* MMIO mapping setup. */ |
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info->fix.mmio_start = start; |
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par->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len); |
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if (!par->mmio) { |
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printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev)); |
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err = -ENOMEM; |
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goto err_resource; |
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} |
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par->sfb = par->mmio + PMAGB_B_SFB; |
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par->dac = par->mmio + PMAGB_B_BT459; |
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/* Frame buffer mapping setup. */ |
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info->fix.smem_start = start + PMAGB_B_FBMEM; |
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par->smem = ioremap(info->fix.smem_start, info->fix.smem_len); |
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if (!par->smem) { |
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printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev)); |
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err = -ENOMEM; |
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goto err_mmio_map; |
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} |
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vid_base = sfb_read(par, SFB_REG_VID_BASE); |
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info->screen_base = (void __iomem *)par->smem + vid_base * 0x1000; |
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info->screen_size = info->fix.smem_len - 2 * vid_base * 0x1000; |
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pmagbbfb_erase_cursor(info); |
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pmagbbfb_screen_setup(info); |
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pmagbbfb_osc_setup(info); |
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err = register_framebuffer(info); |
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if (err < 0) { |
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printk(KERN_ERR "%s: Cannot register framebuffer\n", |
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dev_name(dev)); |
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goto err_smem_map; |
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} |
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get_device(dev); |
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snprintf(freq0, sizeof(freq0), "%u.%03uMHz", |
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par->osc0 / 1000, par->osc0 % 1000); |
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snprintf(freq1, sizeof(freq1), "%u.%03uMHz", |
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par->osc1 / 1000, par->osc1 % 1000); |
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fb_info(info, "%s frame buffer device at %s\n", |
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info->fix.id, dev_name(dev)); |
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fb_info(info, "Osc0: %s, Osc1: %s, Osc%u selected\n", |
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freq0, par->osc1 ? freq1 : "disabled", par->osc1 != 0); |
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return 0; |
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err_smem_map: |
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iounmap(par->smem); |
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err_mmio_map: |
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iounmap(par->mmio); |
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err_resource: |
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release_mem_region(start, len); |
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err_cmap: |
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fb_dealloc_cmap(&info->cmap); |
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err_alloc: |
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framebuffer_release(info); |
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return err; |
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} |
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static int pmagbbfb_remove(struct device *dev) |
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{ |
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struct tc_dev *tdev = to_tc_dev(dev); |
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struct fb_info *info = dev_get_drvdata(dev); |
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struct pmagbbfb_par *par = info->par; |
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resource_size_t start, len; |
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put_device(dev); |
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unregister_framebuffer(info); |
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iounmap(par->smem); |
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iounmap(par->mmio); |
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start = tdev->resource.start; |
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len = tdev->resource.end - start + 1; |
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release_mem_region(start, len); |
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fb_dealloc_cmap(&info->cmap); |
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framebuffer_release(info); |
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return 0; |
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} |
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/* |
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* Initialize the framebuffer. |
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*/ |
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static const struct tc_device_id pmagbbfb_tc_table[] = { |
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{ "DEC ", "PMAGB-BA" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(tc, pmagbbfb_tc_table); |
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static struct tc_driver pmagbbfb_driver = { |
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.id_table = pmagbbfb_tc_table, |
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.driver = { |
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.name = "pmagbbfb", |
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.bus = &tc_bus_type, |
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.probe = pmagbbfb_probe, |
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.remove = pmagbbfb_remove, |
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}, |
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}; |
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static int __init pmagbbfb_init(void) |
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{ |
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#ifndef MODULE |
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if (fb_get_options("pmagbbfb", NULL)) |
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return -ENXIO; |
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#endif |
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return tc_register_driver(&pmagbbfb_driver); |
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} |
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static void __exit pmagbbfb_exit(void) |
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{ |
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tc_unregister_driver(&pmagbbfb_driver); |
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} |
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module_init(pmagbbfb_init); |
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module_exit(pmagbbfb_exit); |
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MODULE_LICENSE("GPL");
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