diff options
Diffstat (limited to 'drivers/gpu/drm/imx/dcss/dcss-ctxld.c')
| -rw-r--r-- | drivers/gpu/drm/imx/dcss/dcss-ctxld.c | 424 |
1 files changed, 424 insertions, 0 deletions
diff --git a/drivers/gpu/drm/imx/dcss/dcss-ctxld.c b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c new file mode 100644 index 000000000..3a84cb320 --- /dev/null +++ b/drivers/gpu/drm/imx/dcss/dcss-ctxld.c @@ -0,0 +1,424 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2019 NXP. + */ + +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include "dcss-dev.h" + +#define DCSS_CTXLD_CONTROL_STATUS 0x0 +#define CTXLD_ENABLE BIT(0) +#define ARB_SEL BIT(1) +#define RD_ERR_EN BIT(2) +#define DB_COMP_EN BIT(3) +#define SB_HP_COMP_EN BIT(4) +#define SB_LP_COMP_EN BIT(5) +#define DB_PEND_SB_REC_EN BIT(6) +#define SB_PEND_DISP_ACTIVE_EN BIT(7) +#define AHB_ERR_EN BIT(8) +#define RD_ERR BIT(16) +#define DB_COMP BIT(17) +#define SB_HP_COMP BIT(18) +#define SB_LP_COMP BIT(19) +#define DB_PEND_SB_REC BIT(20) +#define SB_PEND_DISP_ACTIVE BIT(21) +#define AHB_ERR BIT(22) +#define DCSS_CTXLD_DB_BASE_ADDR 0x10 +#define DCSS_CTXLD_DB_COUNT 0x14 +#define DCSS_CTXLD_SB_BASE_ADDR 0x18 +#define DCSS_CTXLD_SB_COUNT 0x1C +#define SB_HP_COUNT_POS 0 +#define SB_HP_COUNT_MASK 0xffff +#define SB_LP_COUNT_POS 16 +#define SB_LP_COUNT_MASK 0xffff0000 +#define DCSS_AHB_ERR_ADDR 0x20 + +#define CTXLD_IRQ_COMPLETION (DB_COMP | SB_HP_COMP | SB_LP_COMP) +#define CTXLD_IRQ_ERROR (RD_ERR | DB_PEND_SB_REC | AHB_ERR) + +/* The following sizes are in context loader entries, 8 bytes each. */ +#define CTXLD_DB_CTX_ENTRIES 1024 /* max 65536 */ +#define CTXLD_SB_LP_CTX_ENTRIES 10240 /* max 65536 */ +#define CTXLD_SB_HP_CTX_ENTRIES 20000 /* max 65536 */ +#define CTXLD_SB_CTX_ENTRIES (CTXLD_SB_LP_CTX_ENTRIES + \ + CTXLD_SB_HP_CTX_ENTRIES) + +/* Sizes, in entries, of the DB, SB_HP and SB_LP context regions. */ +static u16 dcss_ctxld_ctx_size[3] = { + CTXLD_DB_CTX_ENTRIES, + CTXLD_SB_HP_CTX_ENTRIES, + CTXLD_SB_LP_CTX_ENTRIES +}; + +/* this represents an entry in the context loader map */ +struct dcss_ctxld_item { + u32 val; + u32 ofs; +}; + +#define CTX_ITEM_SIZE sizeof(struct dcss_ctxld_item) + +struct dcss_ctxld { + struct device *dev; + void __iomem *ctxld_reg; + int irq; + bool irq_en; + + struct dcss_ctxld_item *db[2]; + struct dcss_ctxld_item *sb_hp[2]; + struct dcss_ctxld_item *sb_lp[2]; + + dma_addr_t db_paddr[2]; + dma_addr_t sb_paddr[2]; + + u16 ctx_size[2][3]; /* holds the sizes of DB, SB_HP and SB_LP ctx */ + u8 current_ctx; + + bool in_use; + bool armed; + + spinlock_t lock; /* protects concurent access to private data */ +}; + +static irqreturn_t dcss_ctxld_irq_handler(int irq, void *data) +{ + struct dcss_ctxld *ctxld = data; + struct dcss_dev *dcss = dcss_drv_dev_to_dcss(ctxld->dev); + u32 irq_status; + + irq_status = dcss_readl(ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS); + + if (irq_status & CTXLD_IRQ_COMPLETION && + !(irq_status & CTXLD_ENABLE) && ctxld->in_use) { + ctxld->in_use = false; + + if (dcss && dcss->disable_callback) + dcss->disable_callback(dcss); + } else if (irq_status & CTXLD_IRQ_ERROR) { + /* + * Except for throwing an error message and clearing the status + * register, there's not much we can do here. + */ + dev_err(ctxld->dev, "ctxld: error encountered: %08x\n", + irq_status); + dev_err(ctxld->dev, "ctxld: db=%d, sb_hp=%d, sb_lp=%d\n", + ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_DB], + ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_SB_HP], + ctxld->ctx_size[ctxld->current_ctx ^ 1][CTX_SB_LP]); + } + + dcss_clr(irq_status & (CTXLD_IRQ_ERROR | CTXLD_IRQ_COMPLETION), + ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS); + + return IRQ_HANDLED; +} + +static int dcss_ctxld_irq_config(struct dcss_ctxld *ctxld, + struct platform_device *pdev) +{ + int ret; + + ctxld->irq = platform_get_irq_byname(pdev, "ctxld"); + if (ctxld->irq < 0) + return ctxld->irq; + + ret = request_irq(ctxld->irq, dcss_ctxld_irq_handler, + 0, "dcss_ctxld", ctxld); + if (ret) { + dev_err(ctxld->dev, "ctxld: irq request failed.\n"); + return ret; + } + + ctxld->irq_en = true; + + return 0; +} + +static void dcss_ctxld_hw_cfg(struct dcss_ctxld *ctxld) +{ + dcss_writel(RD_ERR_EN | SB_HP_COMP_EN | + DB_PEND_SB_REC_EN | AHB_ERR_EN | RD_ERR | AHB_ERR, + ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS); +} + +static void dcss_ctxld_free_ctx(struct dcss_ctxld *ctxld) +{ + struct dcss_ctxld_item *ctx; + int i; + + for (i = 0; i < 2; i++) { + if (ctxld->db[i]) { + dma_free_coherent(ctxld->dev, + CTXLD_DB_CTX_ENTRIES * sizeof(*ctx), + ctxld->db[i], ctxld->db_paddr[i]); + ctxld->db[i] = NULL; + ctxld->db_paddr[i] = 0; + } + + if (ctxld->sb_hp[i]) { + dma_free_coherent(ctxld->dev, + CTXLD_SB_CTX_ENTRIES * sizeof(*ctx), + ctxld->sb_hp[i], ctxld->sb_paddr[i]); + ctxld->sb_hp[i] = NULL; + ctxld->sb_paddr[i] = 0; + } + } +} + +static int dcss_ctxld_alloc_ctx(struct dcss_ctxld *ctxld) +{ + struct dcss_ctxld_item *ctx; + int i; + + for (i = 0; i < 2; i++) { + ctx = dma_alloc_coherent(ctxld->dev, + CTXLD_DB_CTX_ENTRIES * sizeof(*ctx), + &ctxld->db_paddr[i], GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctxld->db[i] = ctx; + + ctx = dma_alloc_coherent(ctxld->dev, + CTXLD_SB_CTX_ENTRIES * sizeof(*ctx), + &ctxld->sb_paddr[i], GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctxld->sb_hp[i] = ctx; + ctxld->sb_lp[i] = ctx + CTXLD_SB_HP_CTX_ENTRIES; + } + + return 0; +} + +int dcss_ctxld_init(struct dcss_dev *dcss, unsigned long ctxld_base) +{ + struct dcss_ctxld *ctxld; + int ret; + + ctxld = kzalloc(sizeof(*ctxld), GFP_KERNEL); + if (!ctxld) + return -ENOMEM; + + dcss->ctxld = ctxld; + ctxld->dev = dcss->dev; + + spin_lock_init(&ctxld->lock); + + ret = dcss_ctxld_alloc_ctx(ctxld); + if (ret) { + dev_err(dcss->dev, "ctxld: cannot allocate context memory.\n"); + goto err; + } + + ctxld->ctxld_reg = ioremap(ctxld_base, SZ_4K); + if (!ctxld->ctxld_reg) { + dev_err(dcss->dev, "ctxld: unable to remap ctxld base\n"); + ret = -ENOMEM; + goto err; + } + + ret = dcss_ctxld_irq_config(ctxld, to_platform_device(dcss->dev)); + if (ret) + goto err_irq; + + dcss_ctxld_hw_cfg(ctxld); + + return 0; + +err_irq: + iounmap(ctxld->ctxld_reg); + +err: + dcss_ctxld_free_ctx(ctxld); + kfree(ctxld); + + return ret; +} + +void dcss_ctxld_exit(struct dcss_ctxld *ctxld) +{ + free_irq(ctxld->irq, ctxld); + + if (ctxld->ctxld_reg) + iounmap(ctxld->ctxld_reg); + + dcss_ctxld_free_ctx(ctxld); + kfree(ctxld); +} + +static int dcss_ctxld_enable_locked(struct dcss_ctxld *ctxld) +{ + int curr_ctx = ctxld->current_ctx; + u32 db_base, sb_base, sb_count; + u32 sb_hp_cnt, sb_lp_cnt, db_cnt; + struct dcss_dev *dcss = dcss_drv_dev_to_dcss(ctxld->dev); + + if (!dcss) + return 0; + + dcss_dpr_write_sysctrl(dcss->dpr); + + dcss_scaler_write_sclctrl(dcss->scaler); + + sb_hp_cnt = ctxld->ctx_size[curr_ctx][CTX_SB_HP]; + sb_lp_cnt = ctxld->ctx_size[curr_ctx][CTX_SB_LP]; + db_cnt = ctxld->ctx_size[curr_ctx][CTX_DB]; + + /* make sure SB_LP context area comes after SB_HP */ + if (sb_lp_cnt && + ctxld->sb_lp[curr_ctx] != ctxld->sb_hp[curr_ctx] + sb_hp_cnt) { + struct dcss_ctxld_item *sb_lp_adjusted; + + sb_lp_adjusted = ctxld->sb_hp[curr_ctx] + sb_hp_cnt; + + memcpy(sb_lp_adjusted, ctxld->sb_lp[curr_ctx], + sb_lp_cnt * CTX_ITEM_SIZE); + } + + db_base = db_cnt ? ctxld->db_paddr[curr_ctx] : 0; + + dcss_writel(db_base, ctxld->ctxld_reg + DCSS_CTXLD_DB_BASE_ADDR); + dcss_writel(db_cnt, ctxld->ctxld_reg + DCSS_CTXLD_DB_COUNT); + + if (sb_hp_cnt) + sb_count = ((sb_hp_cnt << SB_HP_COUNT_POS) & SB_HP_COUNT_MASK) | + ((sb_lp_cnt << SB_LP_COUNT_POS) & SB_LP_COUNT_MASK); + else + sb_count = (sb_lp_cnt << SB_HP_COUNT_POS) & SB_HP_COUNT_MASK; + + sb_base = sb_count ? ctxld->sb_paddr[curr_ctx] : 0; + + dcss_writel(sb_base, ctxld->ctxld_reg + DCSS_CTXLD_SB_BASE_ADDR); + dcss_writel(sb_count, ctxld->ctxld_reg + DCSS_CTXLD_SB_COUNT); + + /* enable the context loader */ + dcss_set(CTXLD_ENABLE, ctxld->ctxld_reg + DCSS_CTXLD_CONTROL_STATUS); + + ctxld->in_use = true; + + /* + * Toggle the current context to the alternate one so that any updates + * in the modules' settings take place there. + */ + ctxld->current_ctx ^= 1; + + ctxld->ctx_size[ctxld->current_ctx][CTX_DB] = 0; + ctxld->ctx_size[ctxld->current_ctx][CTX_SB_HP] = 0; + ctxld->ctx_size[ctxld->current_ctx][CTX_SB_LP] = 0; + + return 0; +} + +int dcss_ctxld_enable(struct dcss_ctxld *ctxld) +{ + spin_lock_irq(&ctxld->lock); + ctxld->armed = true; + spin_unlock_irq(&ctxld->lock); + + return 0; +} + +void dcss_ctxld_kick(struct dcss_ctxld *ctxld) +{ + unsigned long flags; + + spin_lock_irqsave(&ctxld->lock, flags); + if (ctxld->armed && !ctxld->in_use) { + ctxld->armed = false; + dcss_ctxld_enable_locked(ctxld); + } + spin_unlock_irqrestore(&ctxld->lock, flags); +} + +void dcss_ctxld_write_irqsafe(struct dcss_ctxld *ctxld, u32 ctx_id, u32 val, + u32 reg_ofs) +{ + int curr_ctx = ctxld->current_ctx; + struct dcss_ctxld_item *ctx[] = { + [CTX_DB] = ctxld->db[curr_ctx], + [CTX_SB_HP] = ctxld->sb_hp[curr_ctx], + [CTX_SB_LP] = ctxld->sb_lp[curr_ctx] + }; + int item_idx = ctxld->ctx_size[curr_ctx][ctx_id]; + + if (item_idx + 1 > dcss_ctxld_ctx_size[ctx_id]) { + WARN_ON(1); + return; + } + + ctx[ctx_id][item_idx].val = val; + ctx[ctx_id][item_idx].ofs = reg_ofs; + ctxld->ctx_size[curr_ctx][ctx_id] += 1; +} + +void dcss_ctxld_write(struct dcss_ctxld *ctxld, u32 ctx_id, + u32 val, u32 reg_ofs) +{ + spin_lock_irq(&ctxld->lock); + dcss_ctxld_write_irqsafe(ctxld, ctx_id, val, reg_ofs); + spin_unlock_irq(&ctxld->lock); +} + +bool dcss_ctxld_is_flushed(struct dcss_ctxld *ctxld) +{ + return ctxld->ctx_size[ctxld->current_ctx][CTX_DB] == 0 && + ctxld->ctx_size[ctxld->current_ctx][CTX_SB_HP] == 0 && + ctxld->ctx_size[ctxld->current_ctx][CTX_SB_LP] == 0; +} + +int dcss_ctxld_resume(struct dcss_ctxld *ctxld) +{ + dcss_ctxld_hw_cfg(ctxld); + + if (!ctxld->irq_en) { + enable_irq(ctxld->irq); + ctxld->irq_en = true; + } + + return 0; +} + +int dcss_ctxld_suspend(struct dcss_ctxld *ctxld) +{ + int ret = 0; + unsigned long timeout = jiffies + msecs_to_jiffies(500); + + if (!dcss_ctxld_is_flushed(ctxld)) { + dcss_ctxld_kick(ctxld); + + while (!time_after(jiffies, timeout) && ctxld->in_use) + msleep(20); + + if (time_after(jiffies, timeout)) + return -ETIMEDOUT; + } + + spin_lock_irq(&ctxld->lock); + + if (ctxld->irq_en) { + disable_irq_nosync(ctxld->irq); + ctxld->irq_en = false; + } + + /* reset context region and sizes */ + ctxld->current_ctx = 0; + ctxld->ctx_size[0][CTX_DB] = 0; + ctxld->ctx_size[0][CTX_SB_HP] = 0; + ctxld->ctx_size[0][CTX_SB_LP] = 0; + + spin_unlock_irq(&ctxld->lock); + + return ret; +} + +void dcss_ctxld_assert_locked(struct dcss_ctxld *ctxld) +{ + lockdep_assert_held(&ctxld->lock); +} |