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![Damian](/assets/img/avatar_default.png)
Since the NV24 framebuffer has a CbCr plane that is twice as wide as the Y plane, it needs to be handled as a special case. Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
567 lines
14 KiB
C
567 lines
14 KiB
C
/*
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* SuperH Mobile MERAM Driver for SuperH Mobile LCDC Driver
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*
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* Copyright (c) 2011 Damian Hobson-Garcia <dhobsong@igel.co.jp>
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* Takanari Hayama <taki@igel.co.jp>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include "sh_mobile_meram.h"
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/* meram registers */
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#define MExxCTL 0x0
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#define MExxBSIZE 0x4
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#define MExxMNCF 0x8
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#define MExxSARA 0x10
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#define MExxSARB 0x14
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#define MExxSBSIZE 0x18
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#define MERAM_MExxCTL_VAL(ctl, next_icb, addr) \
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((ctl) | (((next_icb) & 0x1f) << 11) | (((addr) & 0x7ff) << 16))
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#define MERAM_MExxBSIZE_VAL(a, b, c) \
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(((a) << 28) | ((b) << 16) | (c))
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#define MEVCR1 0x4
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#define MEACTS 0x10
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#define MEQSEL1 0x40
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#define MEQSEL2 0x44
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/* settings */
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#define MERAM_SEC_LINE 15
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#define MERAM_LINE_WIDTH 2048
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/*
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* MERAM/ICB access functions
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*/
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#define MERAM_ICB_OFFSET(base, idx, off) \
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((base) + (0x400 + ((idx) * 0x20) + (off)))
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static inline void meram_write_icb(void __iomem *base, int idx, int off,
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unsigned long val)
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{
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iowrite32(val, MERAM_ICB_OFFSET(base, idx, off));
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}
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static inline unsigned long meram_read_icb(void __iomem *base, int idx, int off)
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{
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return ioread32(MERAM_ICB_OFFSET(base, idx, off));
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}
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static inline void meram_write_reg(void __iomem *base, int off,
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unsigned long val)
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{
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iowrite32(val, base + off);
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}
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static inline unsigned long meram_read_reg(void __iomem *base, int off)
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{
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return ioread32(base + off);
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}
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/*
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* register ICB
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*/
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#define MERAM_CACHE_START(p) ((p) >> 16)
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#define MERAM_CACHE_END(p) ((p) & 0xffff)
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#define MERAM_CACHE_SET(o, s) ((((o) & 0xffff) << 16) | \
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(((o) + (s) - 1) & 0xffff))
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/*
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* check if there's no overlaps in MERAM allocation.
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*/
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static inline int meram_check_overlap(struct sh_mobile_meram_priv *priv,
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struct sh_mobile_meram_icb *new)
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{
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int i;
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int used_start, used_end, meram_start, meram_end;
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/* valid ICB? */
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if (new->marker_icb & ~0x1f || new->cache_icb & ~0x1f)
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return 1;
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if (test_bit(new->marker_icb, &priv->used_icb) ||
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test_bit(new->cache_icb, &priv->used_icb))
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return 1;
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for (i = 0; i < priv->used_meram_cache_regions; i++) {
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used_start = MERAM_CACHE_START(priv->used_meram_cache[i]);
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used_end = MERAM_CACHE_END(priv->used_meram_cache[i]);
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meram_start = new->meram_offset;
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meram_end = new->meram_offset + new->meram_size;
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if ((meram_start >= used_start && meram_start < used_end) ||
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(meram_end > used_start && meram_end < used_end))
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return 1;
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}
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return 0;
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}
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/*
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* mark the specified ICB as used
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*/
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static inline void meram_mark(struct sh_mobile_meram_priv *priv,
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struct sh_mobile_meram_icb *new)
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{
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int n;
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if (new->marker_icb < 0 || new->cache_icb < 0)
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return;
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__set_bit(new->marker_icb, &priv->used_icb);
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__set_bit(new->cache_icb, &priv->used_icb);
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n = priv->used_meram_cache_regions;
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priv->used_meram_cache[n] = MERAM_CACHE_SET(new->meram_offset,
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new->meram_size);
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priv->used_meram_cache_regions++;
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}
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/*
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* unmark the specified ICB as used
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*/
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static inline void meram_unmark(struct sh_mobile_meram_priv *priv,
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struct sh_mobile_meram_icb *icb)
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{
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int i;
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unsigned long pattern;
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if (icb->marker_icb < 0 || icb->cache_icb < 0)
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return;
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__clear_bit(icb->marker_icb, &priv->used_icb);
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__clear_bit(icb->cache_icb, &priv->used_icb);
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pattern = MERAM_CACHE_SET(icb->meram_offset, icb->meram_size);
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for (i = 0; i < priv->used_meram_cache_regions; i++) {
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if (priv->used_meram_cache[i] == pattern) {
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while (i < priv->used_meram_cache_regions - 1) {
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priv->used_meram_cache[i] =
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priv->used_meram_cache[i + 1] ;
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i++;
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}
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priv->used_meram_cache[i] = 0;
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priv->used_meram_cache_regions--;
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break;
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}
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}
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}
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/*
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* is this a YCbCr(NV12, NV16 or NV24) colorspace
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*/
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static inline int is_nvcolor(int cspace)
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{
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if (cspace == SH_MOBILE_MERAM_PF_NV ||
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cspace == SH_MOBILE_MERAM_PF_NV24)
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return 1;
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return 0;
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}
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/*
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* set the next address to fetch
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*/
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static inline void meram_set_next_addr(struct sh_mobile_meram_priv *priv,
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struct sh_mobile_meram_cfg *cfg,
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unsigned long base_addr_y,
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unsigned long base_addr_c)
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{
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unsigned long target;
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target = (cfg->current_reg) ? MExxSARA : MExxSARB;
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cfg->current_reg ^= 1;
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/* set the next address to fetch */
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meram_write_icb(priv->base, cfg->icb[0].cache_icb, target,
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base_addr_y);
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meram_write_icb(priv->base, cfg->icb[0].marker_icb, target,
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base_addr_y + cfg->icb[0].cache_unit);
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if (is_nvcolor(cfg->pixelformat)) {
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meram_write_icb(priv->base, cfg->icb[1].cache_icb, target,
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base_addr_c);
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meram_write_icb(priv->base, cfg->icb[1].marker_icb, target,
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base_addr_c + cfg->icb[1].cache_unit);
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}
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}
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/*
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* get the next ICB address
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*/
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static inline void meram_get_next_icb_addr(struct sh_mobile_meram_info *pdata,
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struct sh_mobile_meram_cfg *cfg,
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unsigned long *icb_addr_y,
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unsigned long *icb_addr_c)
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{
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unsigned long icb_offset;
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if (pdata->addr_mode == SH_MOBILE_MERAM_MODE0)
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icb_offset = 0x80000000 | (cfg->current_reg << 29);
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else
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icb_offset = 0xc0000000 | (cfg->current_reg << 23);
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*icb_addr_y = icb_offset | (cfg->icb[0].marker_icb << 24);
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if ((*icb_addr_c) && is_nvcolor(cfg->pixelformat))
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*icb_addr_c = icb_offset | (cfg->icb[1].marker_icb << 24);
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}
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#define MERAM_CALC_BYTECOUNT(x, y) \
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(((x) * (y) + (MERAM_LINE_WIDTH - 1)) & ~(MERAM_LINE_WIDTH - 1))
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/*
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* initialize MERAM
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*/
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static int meram_init(struct sh_mobile_meram_priv *priv,
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struct sh_mobile_meram_icb *icb,
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int xres, int yres, int *out_pitch)
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{
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unsigned long total_byte_count = MERAM_CALC_BYTECOUNT(xres, yres);
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unsigned long bnm;
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int lcdc_pitch, xpitch, line_cnt;
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int save_lines;
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/* adjust pitch to 1024, 2048, 4096 or 8192 */
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lcdc_pitch = (xres - 1) | 1023;
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lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 1);
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lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 2);
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lcdc_pitch += 1;
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/* derive settings */
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if (lcdc_pitch == 8192 && yres >= 1024) {
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lcdc_pitch = xpitch = MERAM_LINE_WIDTH;
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line_cnt = total_byte_count >> 11;
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*out_pitch = xres;
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save_lines = (icb->meram_size / 16 / MERAM_SEC_LINE);
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save_lines *= MERAM_SEC_LINE;
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} else {
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xpitch = xres;
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line_cnt = yres;
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*out_pitch = lcdc_pitch;
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save_lines = icb->meram_size / (lcdc_pitch >> 10) / 2;
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save_lines &= 0xff;
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}
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bnm = (save_lines - 1) << 16;
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/* TODO: we better to check if we have enough MERAM buffer size */
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/* set up ICB */
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meram_write_icb(priv->base, icb->cache_icb, MExxBSIZE,
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MERAM_MExxBSIZE_VAL(0x0, line_cnt - 1, xpitch - 1));
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meram_write_icb(priv->base, icb->marker_icb, MExxBSIZE,
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MERAM_MExxBSIZE_VAL(0xf, line_cnt - 1, xpitch - 1));
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meram_write_icb(priv->base, icb->cache_icb, MExxMNCF, bnm);
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meram_write_icb(priv->base, icb->marker_icb, MExxMNCF, bnm);
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meram_write_icb(priv->base, icb->cache_icb, MExxSBSIZE, xpitch);
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meram_write_icb(priv->base, icb->marker_icb, MExxSBSIZE, xpitch);
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/* save a cache unit size */
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icb->cache_unit = xres * save_lines;
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/*
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* Set MERAM for framebuffer
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*
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* 0x70f: WD = 0x3, WS=0x1, CM=0x1, MD=FB mode
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* we also chain the cache_icb and the marker_icb.
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* we also split the allocated MERAM buffer between two ICBs.
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*/
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meram_write_icb(priv->base, icb->cache_icb, MExxCTL,
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MERAM_MExxCTL_VAL(0x70f, icb->marker_icb,
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icb->meram_offset));
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meram_write_icb(priv->base, icb->marker_icb, MExxCTL,
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MERAM_MExxCTL_VAL(0x70f, icb->cache_icb,
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icb->meram_offset +
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icb->meram_size / 2));
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return 0;
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}
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static void meram_deinit(struct sh_mobile_meram_priv *priv,
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struct sh_mobile_meram_icb *icb)
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{
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/* disable ICB */
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meram_write_icb(priv->base, icb->cache_icb, MExxCTL, 0);
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meram_write_icb(priv->base, icb->marker_icb, MExxCTL, 0);
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icb->cache_unit = 0;
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}
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/*
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* register the ICB
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*/
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static int sh_mobile_meram_register(struct sh_mobile_meram_info *pdata,
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struct sh_mobile_meram_cfg *cfg,
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int xres, int yres, int pixelformat,
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unsigned long base_addr_y,
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unsigned long base_addr_c,
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unsigned long *icb_addr_y,
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unsigned long *icb_addr_c,
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int *pitch)
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{
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struct platform_device *pdev;
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struct sh_mobile_meram_priv *priv;
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int n, out_pitch;
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int error = 0;
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if (!pdata || !pdata->priv || !pdata->pdev || !cfg)
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return -EINVAL;
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if (pixelformat != SH_MOBILE_MERAM_PF_NV &&
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pixelformat != SH_MOBILE_MERAM_PF_NV24 &&
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pixelformat != SH_MOBILE_MERAM_PF_RGB)
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return -EINVAL;
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priv = pdata->priv;
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pdev = pdata->pdev;
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dev_dbg(&pdev->dev, "registering %dx%d (%s) (y=%08lx, c=%08lx)",
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xres, yres, (!pixelformat) ? "yuv" : "rgb",
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base_addr_y, base_addr_c);
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mutex_lock(&priv->lock);
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/* we can't handle wider than 8192px */
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if (xres > 8192) {
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dev_err(&pdev->dev, "width exceeding the limit (> 8192).");
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error = -EINVAL;
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goto err;
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}
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if (priv->used_meram_cache_regions + 2 > SH_MOBILE_MERAM_ICB_NUM) {
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dev_err(&pdev->dev, "no more ICB available.");
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error = -EINVAL;
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goto err;
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}
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/* do we have at least one ICB config? */
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if (cfg->icb[0].marker_icb < 0 || cfg->icb[0].cache_icb < 0) {
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dev_err(&pdev->dev, "at least one ICB is required.");
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error = -EINVAL;
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goto err;
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}
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/* make sure that there's no overlaps */
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if (meram_check_overlap(priv, &cfg->icb[0])) {
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dev_err(&pdev->dev, "conflicting config detected.");
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error = -EINVAL;
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goto err;
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}
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n = 1;
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/* do the same if we have the second ICB set */
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if (cfg->icb[1].marker_icb >= 0 && cfg->icb[1].cache_icb >= 0) {
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if (meram_check_overlap(priv, &cfg->icb[1])) {
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dev_err(&pdev->dev, "conflicting config detected.");
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error = -EINVAL;
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goto err;
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}
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n = 2;
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}
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if (is_nvcolor(pixelformat) && n != 2) {
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dev_err(&pdev->dev, "requires two ICB sets for planar Y/C.");
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error = -EINVAL;
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goto err;
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}
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/* we now register the ICB */
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cfg->pixelformat = pixelformat;
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meram_mark(priv, &cfg->icb[0]);
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if (is_nvcolor(pixelformat))
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meram_mark(priv, &cfg->icb[1]);
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/* initialize MERAM */
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meram_init(priv, &cfg->icb[0], xres, yres, &out_pitch);
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*pitch = out_pitch;
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if (pixelformat == SH_MOBILE_MERAM_PF_NV)
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meram_init(priv, &cfg->icb[1], xres, (yres + 1) / 2,
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&out_pitch);
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else if (pixelformat == SH_MOBILE_MERAM_PF_NV24)
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meram_init(priv, &cfg->icb[1], 2 * xres, (yres + 1) / 2,
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&out_pitch);
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cfg->current_reg = 1;
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meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
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meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
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dev_dbg(&pdev->dev, "registered - can access via y=%08lx, c=%08lx",
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*icb_addr_y, *icb_addr_c);
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err:
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mutex_unlock(&priv->lock);
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return error;
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}
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static int sh_mobile_meram_unregister(struct sh_mobile_meram_info *pdata,
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struct sh_mobile_meram_cfg *cfg)
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{
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struct sh_mobile_meram_priv *priv;
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if (!pdata || !pdata->priv || !cfg)
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return -EINVAL;
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priv = pdata->priv;
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mutex_lock(&priv->lock);
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/* deinit & unmark */
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if (is_nvcolor(cfg->pixelformat)) {
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meram_deinit(priv, &cfg->icb[1]);
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meram_unmark(priv, &cfg->icb[1]);
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}
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meram_deinit(priv, &cfg->icb[0]);
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meram_unmark(priv, &cfg->icb[0]);
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mutex_unlock(&priv->lock);
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return 0;
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}
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static int sh_mobile_meram_update(struct sh_mobile_meram_info *pdata,
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struct sh_mobile_meram_cfg *cfg,
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unsigned long base_addr_y,
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unsigned long base_addr_c,
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unsigned long *icb_addr_y,
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unsigned long *icb_addr_c)
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{
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struct sh_mobile_meram_priv *priv;
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if (!pdata || !pdata->priv || !cfg)
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return -EINVAL;
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priv = pdata->priv;
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mutex_lock(&priv->lock);
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meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
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meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
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mutex_unlock(&priv->lock);
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return 0;
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}
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static struct sh_mobile_meram_ops sh_mobile_meram_ops = {
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.module = THIS_MODULE,
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.meram_register = sh_mobile_meram_register,
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.meram_unregister = sh_mobile_meram_unregister,
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.meram_update = sh_mobile_meram_update,
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};
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/*
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* initialize MERAM
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*/
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static int sh_mobile_meram_remove(struct platform_device *pdev);
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static int __devinit sh_mobile_meram_probe(struct platform_device *pdev)
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{
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struct sh_mobile_meram_priv *priv;
|
|
struct sh_mobile_meram_info *pdata = pdev->dev.platform_data;
|
|
struct resource *res;
|
|
int error;
|
|
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "no platform data defined\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(&pdev->dev, "cannot get platform resources\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv) {
|
|
dev_err(&pdev->dev, "cannot allocate device data\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
/* initialize private data */
|
|
mutex_init(&priv->lock);
|
|
priv->base = ioremap_nocache(res->start, resource_size(res));
|
|
if (!priv->base) {
|
|
dev_err(&pdev->dev, "ioremap failed\n");
|
|
error = -EFAULT;
|
|
goto err;
|
|
}
|
|
pdata->ops = &sh_mobile_meram_ops;
|
|
pdata->priv = priv;
|
|
pdata->pdev = pdev;
|
|
|
|
/* initialize ICB addressing mode */
|
|
if (pdata->addr_mode == SH_MOBILE_MERAM_MODE1)
|
|
meram_write_reg(priv->base, MEVCR1, 1 << 29);
|
|
|
|
dev_info(&pdev->dev, "sh_mobile_meram initialized.");
|
|
|
|
return 0;
|
|
|
|
err:
|
|
sh_mobile_meram_remove(pdev);
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
static int sh_mobile_meram_remove(struct platform_device *pdev)
|
|
{
|
|
struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
|
|
|
|
if (priv->base)
|
|
iounmap(priv->base);
|
|
|
|
mutex_destroy(&priv->lock);
|
|
|
|
kfree(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver sh_mobile_meram_driver = {
|
|
.driver = {
|
|
.name = "sh_mobile_meram",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = sh_mobile_meram_probe,
|
|
.remove = sh_mobile_meram_remove,
|
|
};
|
|
|
|
static int __init sh_mobile_meram_init(void)
|
|
{
|
|
return platform_driver_register(&sh_mobile_meram_driver);
|
|
}
|
|
|
|
static void __exit sh_mobile_meram_exit(void)
|
|
{
|
|
platform_driver_unregister(&sh_mobile_meram_driver);
|
|
}
|
|
|
|
module_init(sh_mobile_meram_init);
|
|
module_exit(sh_mobile_meram_exit);
|
|
|
|
MODULE_DESCRIPTION("SuperH Mobile MERAM driver");
|
|
MODULE_AUTHOR("Damian Hobson-Garcia / Takanari Hayama");
|
|
MODULE_LICENSE("GPL v2");
|