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240 lines
5.8 KiB
240 lines
5.8 KiB
/* |
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* linux/drivers/video/bt431.h |
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* |
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* Copyright 2003 Thiemo Seufer <[email protected]> |
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* Copyright 2016 Maciej W. Rozycki <[email protected]> |
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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/types.h> |
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#define BT431_CURSOR_SIZE 64 |
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/* |
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* Bt431 cursor generator registers, 32-bit aligned. |
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* Two twin Bt431 are used on the DECstation's PMAG-AA. |
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*/ |
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struct bt431_regs { |
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volatile u16 addr_lo; |
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u16 pad0; |
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volatile u16 addr_hi; |
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u16 pad1; |
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volatile u16 addr_cmap; |
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u16 pad2; |
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volatile u16 addr_reg; |
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u16 pad3; |
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}; |
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static inline u16 bt431_set_value(u8 val) |
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{ |
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return ((val << 8) | (val & 0xff)) & 0xffff; |
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} |
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static inline u8 bt431_get_value(u16 val) |
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{ |
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return val & 0xff; |
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} |
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/* |
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* Additional registers addressed indirectly. |
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*/ |
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#define BT431_REG_CMD 0x0000 |
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#define BT431_REG_CXLO 0x0001 |
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#define BT431_REG_CXHI 0x0002 |
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#define BT431_REG_CYLO 0x0003 |
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#define BT431_REG_CYHI 0x0004 |
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#define BT431_REG_WXLO 0x0005 |
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#define BT431_REG_WXHI 0x0006 |
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#define BT431_REG_WYLO 0x0007 |
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#define BT431_REG_WYHI 0x0008 |
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#define BT431_REG_WWLO 0x0009 |
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#define BT431_REG_WWHI 0x000a |
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#define BT431_REG_WHLO 0x000b |
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#define BT431_REG_WHHI 0x000c |
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#define BT431_REG_CRAM_BASE 0x0000 |
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#define BT431_REG_CRAM_END 0x01ff |
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/* |
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* Command register. |
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*/ |
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#define BT431_CMD_CURS_ENABLE 0x40 |
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#define BT431_CMD_XHAIR_ENABLE 0x20 |
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#define BT431_CMD_OR_CURSORS 0x10 |
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#define BT431_CMD_XOR_CURSORS 0x00 |
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#define BT431_CMD_1_1_MUX 0x00 |
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#define BT431_CMD_4_1_MUX 0x04 |
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#define BT431_CMD_5_1_MUX 0x08 |
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#define BT431_CMD_xxx_MUX 0x0c |
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#define BT431_CMD_THICK_1 0x00 |
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#define BT431_CMD_THICK_3 0x01 |
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#define BT431_CMD_THICK_5 0x02 |
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#define BT431_CMD_THICK_7 0x03 |
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static inline void bt431_select_reg(struct bt431_regs *regs, int ir) |
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{ |
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/* |
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* The compiler splits the write in two bytes without these |
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* helper variables. |
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*/ |
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volatile u16 *lo = &(regs->addr_lo); |
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volatile u16 *hi = &(regs->addr_hi); |
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mb(); |
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*lo = bt431_set_value(ir & 0xff); |
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wmb(); |
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*hi = bt431_set_value((ir >> 8) & 0xff); |
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} |
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/* Autoincrement read/write. */ |
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static inline u8 bt431_read_reg_inc(struct bt431_regs *regs) |
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{ |
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/* |
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* The compiler splits the write in two bytes without the |
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* helper variable. |
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*/ |
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volatile u16 *r = &(regs->addr_reg); |
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mb(); |
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return bt431_get_value(*r); |
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} |
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static inline void bt431_write_reg_inc(struct bt431_regs *regs, u8 value) |
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{ |
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/* |
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* The compiler splits the write in two bytes without the |
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* helper variable. |
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*/ |
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volatile u16 *r = &(regs->addr_reg); |
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mb(); |
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*r = bt431_set_value(value); |
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} |
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static inline u8 bt431_read_reg(struct bt431_regs *regs, int ir) |
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{ |
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bt431_select_reg(regs, ir); |
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return bt431_read_reg_inc(regs); |
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} |
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static inline void bt431_write_reg(struct bt431_regs *regs, int ir, u8 value) |
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{ |
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bt431_select_reg(regs, ir); |
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bt431_write_reg_inc(regs, value); |
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} |
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/* Autoincremented read/write for the cursor map. */ |
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static inline u16 bt431_read_cmap_inc(struct bt431_regs *regs) |
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{ |
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/* |
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* The compiler splits the write in two bytes without the |
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* helper variable. |
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*/ |
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volatile u16 *r = &(regs->addr_cmap); |
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mb(); |
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return *r; |
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} |
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static inline void bt431_write_cmap_inc(struct bt431_regs *regs, u16 value) |
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{ |
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/* |
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* The compiler splits the write in two bytes without the |
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* helper variable. |
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*/ |
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volatile u16 *r = &(regs->addr_cmap); |
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mb(); |
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*r = value; |
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} |
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static inline u16 bt431_read_cmap(struct bt431_regs *regs, int cr) |
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{ |
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bt431_select_reg(regs, cr); |
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return bt431_read_cmap_inc(regs); |
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} |
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static inline void bt431_write_cmap(struct bt431_regs *regs, int cr, u16 value) |
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{ |
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bt431_select_reg(regs, cr); |
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bt431_write_cmap_inc(regs, value); |
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} |
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static inline void bt431_enable_cursor(struct bt431_regs *regs) |
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{ |
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bt431_write_reg(regs, BT431_REG_CMD, |
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BT431_CMD_CURS_ENABLE | BT431_CMD_OR_CURSORS |
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| BT431_CMD_4_1_MUX | BT431_CMD_THICK_1); |
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} |
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static inline void bt431_erase_cursor(struct bt431_regs *regs) |
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{ |
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bt431_write_reg(regs, BT431_REG_CMD, BT431_CMD_4_1_MUX); |
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} |
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static inline void bt431_position_cursor(struct bt431_regs *regs, u16 x, u16 y) |
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{ |
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/* |
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* Magic from the MACH sources. |
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* |
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* Cx = x + D + H - P |
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* P = 37 if 1:1, 52 if 4:1, 57 if 5:1 |
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* D = pixel skew between outdata and external data |
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* H = pixels between HSYNCH falling and active video |
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* |
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* Cy = y + V - 32 |
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* V = scanlines between HSYNCH falling, two or more |
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* clocks after VSYNCH falling, and active video |
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*/ |
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x += 412 - 52; |
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y += 68 - 32; |
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/* Use autoincrement. */ |
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bt431_select_reg(regs, BT431_REG_CXLO); |
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bt431_write_reg_inc(regs, x & 0xff); /* BT431_REG_CXLO */ |
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bt431_write_reg_inc(regs, (x >> 8) & 0x0f); /* BT431_REG_CXHI */ |
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bt431_write_reg_inc(regs, y & 0xff); /* BT431_REG_CYLO */ |
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bt431_write_reg_inc(regs, (y >> 8) & 0x0f); /* BT431_REG_CYHI */ |
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} |
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static inline void bt431_set_cursor(struct bt431_regs *regs, |
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const char *data, const char *mask, |
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u16 rop, u16 width, u16 height) |
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{ |
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u16 x, y; |
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int i; |
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i = 0; |
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width = DIV_ROUND_UP(width, 8); |
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bt431_select_reg(regs, BT431_REG_CRAM_BASE); |
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for (y = 0; y < BT431_CURSOR_SIZE; y++) |
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for (x = 0; x < BT431_CURSOR_SIZE / 8; x++) { |
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u16 val = 0; |
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if (y < height && x < width) { |
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val = mask[i]; |
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if (rop == ROP_XOR) |
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val = (val << 8) | (val ^ data[i]); |
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else |
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val = (val << 8) | (val & data[i]); |
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i++; |
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} |
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bt431_write_cmap_inc(regs, val); |
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} |
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} |
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static inline void bt431_init_cursor(struct bt431_regs *regs) |
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{ |
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/* no crosshair window */ |
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bt431_select_reg(regs, BT431_REG_WXLO); |
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bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXLO */ |
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bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WXHI */ |
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bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYLO */ |
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bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WYHI */ |
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bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWLO */ |
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bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WWHI */ |
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bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHLO */ |
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bt431_write_reg_inc(regs, 0x00); /* BT431_REG_WHHI */ |
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}
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