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DMAENGINE: ste_dma40: support older silicon
This makes sure the DMA40 driver will also work on the oldest silicon revisions that have the on-chip memory on another location in the DB8500 and also requires explicit suspend before starting or resuming a logical channel. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> [added parenthesis to the definition of U8500_DMA_LCPA_BASE_ED] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
parent
6b7acd8442
commit
f41855929c
3 changed files with 31 additions and 4 deletions
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@ -213,4 +213,6 @@ void dma40_u8500ed_fixup(void)
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dma40_plat_data.memcpy_len = 0;
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dma40_resources[0].start = U8500_DMA_BASE_ED;
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dma40_resources[0].end = U8500_DMA_BASE_ED + SZ_4K - 1;
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dma40_resources[1].start = U8500_DMA_LCPA_BASE_ED;
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dma40_resources[1].end = U8500_DMA_LCPA_BASE_ED + 2 * SZ_1K - 1;
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}
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@ -17,6 +17,7 @@
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#define U8500_ESRAM_BANK4 (U8500_ESRAM_BANK3 + U8500_ESRAM_BANK_SIZE)
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/* Use bank 4 for DMA LCPA */
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#define U8500_DMA_LCPA_BASE U8500_ESRAM_BANK4
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#define U8500_DMA_LCPA_BASE_ED (U8500_ESRAM_BANK4 + 0x4000)
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#define U8500_PER3_BASE 0x80000000
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#define U8500_STM_BASE 0x80100000
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@ -218,6 +218,7 @@ struct d40_chan {
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* the same physical register.
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* @dev: The device structure.
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* @virtbase: The virtual base address of the DMA's register.
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* @rev: silicon revision detected.
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* @clk: Pointer to the DMA clock structure.
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* @phy_start: Physical memory start of the DMA registers.
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* @phy_size: Size of the DMA register map.
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@ -250,6 +251,7 @@ struct d40_base {
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spinlock_t execmd_lock;
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struct device *dev;
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void __iomem *virtbase;
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u8 rev:4;
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struct clk *clk;
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phys_addr_t phy_start;
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resource_size_t phy_size;
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@ -757,6 +759,17 @@ static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx)
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static int d40_start(struct d40_chan *d40c)
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{
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if (d40c->base->rev == 0) {
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int err;
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if (d40c->log_num != D40_PHY_CHAN) {
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err = d40_channel_execute_command(d40c,
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D40_DMA_SUSPEND_REQ);
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if (err)
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return err;
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}
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}
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if (d40c->log_num != D40_PHY_CHAN)
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d40_config_set_event(d40c, true);
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@ -1426,6 +1439,13 @@ static int d40_resume(struct dma_chan *chan)
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spin_lock_irqsave(&d40c->lock, flags);
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if (d40c->base->rev == 0)
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if (d40c->log_num != D40_PHY_CHAN) {
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res = d40_channel_execute_command(d40c,
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D40_DMA_SUSPEND_REQ);
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goto no_suspend;
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}
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/* If bytes left to transfer or linked tx resume job */
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if (d40_residue(d40c) || d40_tx_is_linked(d40c)) {
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if (d40c->log_num != D40_PHY_CHAN)
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@ -1433,6 +1453,7 @@ static int d40_resume(struct dma_chan *chan)
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res = d40_channel_execute_command(d40c, D40_DMA_RUN);
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}
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no_suspend:
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spin_unlock_irqrestore(&d40c->lock, flags);
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return res;
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}
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@ -2286,6 +2307,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
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int num_log_chans = 0;
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int num_phy_chans;
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int i;
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u32 val;
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clk = clk_get(&pdev->dev, NULL);
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@ -2324,12 +2346,13 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
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}
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}
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i = readl(virtbase + D40_DREG_PERIPHID2);
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/* Get silicon revision */
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val = readl(virtbase + D40_DREG_PERIPHID2);
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if ((i & 0xf) != D40_PERIPHID2_DESIGNER) {
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if ((val & 0xf) != D40_PERIPHID2_DESIGNER) {
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dev_err(&pdev->dev,
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"[%s] Unknown designer! Got %x wanted %x\n",
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__func__, i & 0xf, D40_PERIPHID2_DESIGNER);
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__func__, val & 0xf, D40_PERIPHID2_DESIGNER);
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goto failure;
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}
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@ -2337,7 +2360,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
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num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4;
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dev_info(&pdev->dev, "hardware revision: %d @ 0x%x\n",
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(i >> 4) & 0xf, res->start);
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(val >> 4) & 0xf, res->start);
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plat_data = pdev->dev.platform_data;
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@ -2359,6 +2382,7 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
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goto failure;
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}
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base->rev = (val >> 4) & 0xf;
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base->clk = clk;
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base->num_phy_chans = num_phy_chans;
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base->num_log_chans = num_log_chans;
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