diff options
Diffstat (limited to 'drivers/soc')
| -rw-r--r-- | drivers/soc/xilinx/xlnx_vcu.c | 171 |
1 files changed, 104 insertions, 67 deletions
diff --git a/drivers/soc/xilinx/xlnx_vcu.c b/drivers/soc/xilinx/xlnx_vcu.c index 0fd8356a3776..ff66551a5966 100644 --- a/drivers/soc/xilinx/xlnx_vcu.c +++ b/drivers/soc/xilinx/xlnx_vcu.c @@ -272,6 +272,105 @@ static int xvcu_pll_wait_for_lock(struct xvcu_device *xvcu) return -ETIMEDOUT; } +static const struct xvcu_pll_cfg *xvcu_find_cfg(int div) +{ + const struct xvcu_pll_cfg *cfg = NULL; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(xvcu_pll_cfg) - 1; i++) + if (xvcu_pll_cfg[i].fbdiv == div) + cfg = &xvcu_pll_cfg[i]; + + return cfg; +} + +static int xvcu_pll_set_div(struct xvcu_device *xvcu, int div) +{ + void __iomem *base = xvcu->vcu_slcr_ba; + const struct xvcu_pll_cfg *cfg = NULL; + u32 vcu_pll_ctrl; + u32 cfg_val; + + cfg = xvcu_find_cfg(div); + if (!cfg) + return -EINVAL; + + vcu_pll_ctrl = xvcu_read(base, VCU_PLL_CTRL); + vcu_pll_ctrl &= ~(VCU_PLL_CTRL_FBDIV_MASK << VCU_PLL_CTRL_FBDIV_SHIFT); + vcu_pll_ctrl |= (cfg->fbdiv & VCU_PLL_CTRL_FBDIV_MASK) << + VCU_PLL_CTRL_FBDIV_SHIFT; + xvcu_write(base, VCU_PLL_CTRL, vcu_pll_ctrl); + + cfg_val = (cfg->res << VCU_PLL_CFG_RES_SHIFT) | + (cfg->cp << VCU_PLL_CFG_CP_SHIFT) | + (cfg->lfhf << VCU_PLL_CFG_LFHF_SHIFT) | + (cfg->lock_cnt << VCU_PLL_CFG_LOCK_CNT_SHIFT) | + (cfg->lock_dly << VCU_PLL_CFG_LOCK_DLY_SHIFT); + xvcu_write(base, VCU_PLL_CFG, cfg_val); + + return 0; +} + +static int xvcu_pll_set_rate(struct xvcu_device *xvcu, + unsigned long rate, unsigned long parent_rate) +{ + return xvcu_pll_set_div(xvcu, rate / parent_rate); +} + +static int xvcu_pll_enable(struct xvcu_device *xvcu) +{ + void __iomem *base = xvcu->vcu_slcr_ba; + u32 vcu_pll_ctrl; + int ret; + + ret = clk_prepare_enable(xvcu->pll_ref); + if (ret) { + dev_err(xvcu->dev, "failed to enable pll_ref clock source\n"); + return ret; + } + + vcu_pll_ctrl = xvcu_read(base, VCU_PLL_CTRL); + vcu_pll_ctrl &= ~(VCU_PLL_CTRL_POR_IN_MASK << + VCU_PLL_CTRL_POR_IN_SHIFT); + vcu_pll_ctrl |= (VCU_PLL_CTRL_DEFAULT & VCU_PLL_CTRL_POR_IN_MASK) << + VCU_PLL_CTRL_POR_IN_SHIFT; + vcu_pll_ctrl &= ~(VCU_PLL_CTRL_PWR_POR_MASK << + VCU_PLL_CTRL_PWR_POR_SHIFT); + vcu_pll_ctrl |= (VCU_PLL_CTRL_DEFAULT & VCU_PLL_CTRL_PWR_POR_MASK) << + VCU_PLL_CTRL_PWR_POR_SHIFT; + xvcu_write(base, VCU_PLL_CTRL, vcu_pll_ctrl); + + xvcu_write_field_reg(base, VCU_PLL_CTRL, + 1, VCU_PLL_CTRL_BYPASS_MASK, + VCU_PLL_CTRL_BYPASS_SHIFT); + xvcu_write_field_reg(base, VCU_PLL_CTRL, + 1, VCU_PLL_CTRL_RESET_MASK, + VCU_PLL_CTRL_RESET_SHIFT); + xvcu_write_field_reg(base, VCU_PLL_CTRL, + 0, VCU_PLL_CTRL_RESET_MASK, + VCU_PLL_CTRL_RESET_SHIFT); + + ret = xvcu_pll_wait_for_lock(xvcu); + if (ret) { + dev_err(xvcu->dev, "PLL is not locked\n"); + goto err; + } + + xvcu_write_field_reg(base, VCU_PLL_CTRL, + 0, VCU_PLL_CTRL_BYPASS_MASK, + VCU_PLL_CTRL_BYPASS_SHIFT); + + return ret; +err: + clk_disable_unprepare(xvcu->pll_ref); + return ret; +} + +static void xvcu_pll_disable(struct xvcu_device *xvcu) +{ + clk_disable_unprepare(xvcu->pll_ref); +} + /** * xvcu_set_vcu_pll_info - Set the VCU PLL info * @xvcu: Pointer to the xvcu_device structure @@ -292,8 +391,8 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu) u32 refclk, coreclk, mcuclk, inte, deci; u32 divisor_mcu, divisor_core, fvco; u32 clkoutdiv, vcu_pll_ctrl, pll_clk; - u32 cfg_val, mod, ctrl; - int ret, i; + u32 mod, ctrl; + int i; const struct xvcu_pll_cfg *found = NULL; regmap_read(xvcu->logicore_reg_ba, VCU_PLL_CLK, &inte); @@ -312,19 +411,6 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu) dev_dbg(xvcu->dev, "Core clock from logicoreIP is %uHz\n", coreclk); dev_dbg(xvcu->dev, "Mcu clock from logicoreIP is %uHz\n", mcuclk); - clk_disable_unprepare(xvcu->pll_ref); - ret = clk_set_rate(xvcu->pll_ref, refclk); - if (ret) - dev_warn(xvcu->dev, "failed to set logicoreIP refclk rate\n"); - - ret = clk_prepare_enable(xvcu->pll_ref); - if (ret) { - dev_err(xvcu->dev, "failed to enable pll_ref clock source\n"); - return ret; - } - - refclk = clk_get_rate(xvcu->pll_ref); - /* * The divide-by-2 should be always enabled (==1) * to meet the timing in the design. @@ -378,19 +464,6 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu) dev_dbg(xvcu->dev, "Actual Core clock freq is %uHz\n", coreclk); dev_dbg(xvcu->dev, "Actual Mcu clock freq is %uHz\n", mcuclk); - vcu_pll_ctrl &= ~(VCU_PLL_CTRL_FBDIV_MASK << VCU_PLL_CTRL_FBDIV_SHIFT); - vcu_pll_ctrl |= (found->fbdiv & VCU_PLL_CTRL_FBDIV_MASK) << - VCU_PLL_CTRL_FBDIV_SHIFT; - vcu_pll_ctrl &= ~(VCU_PLL_CTRL_POR_IN_MASK << - VCU_PLL_CTRL_POR_IN_SHIFT); - vcu_pll_ctrl |= (VCU_PLL_CTRL_DEFAULT & VCU_PLL_CTRL_POR_IN_MASK) << - VCU_PLL_CTRL_POR_IN_SHIFT; - vcu_pll_ctrl &= ~(VCU_PLL_CTRL_PWR_POR_MASK << - VCU_PLL_CTRL_PWR_POR_SHIFT); - vcu_pll_ctrl |= (VCU_PLL_CTRL_DEFAULT & VCU_PLL_CTRL_PWR_POR_MASK) << - VCU_PLL_CTRL_PWR_POR_SHIFT; - xvcu_write(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, vcu_pll_ctrl); - /* Set divisor for the core and mcu clock */ ctrl = xvcu_read(xvcu->vcu_slcr_ba, VCU_ENC_CORE_CTRL); ctrl &= ~(VCU_PLL_DIVISOR_MASK << VCU_PLL_DIVISOR_SHIFT); @@ -422,15 +495,7 @@ static int xvcu_set_vcu_pll_info(struct xvcu_device *xvcu) ctrl |= (VCU_SRCSEL_PLL & VCU_SRCSEL_MASK) << VCU_SRCSEL_SHIFT; xvcu_write(xvcu->vcu_slcr_ba, VCU_DEC_MCU_CTRL, ctrl); - /* Set RES, CP, LFHF, LOCK_CNT and LOCK_DLY cfg values */ - cfg_val = (found->res << VCU_PLL_CFG_RES_SHIFT) | - (found->cp << VCU_PLL_CFG_CP_SHIFT) | - (found->lfhf << VCU_PLL_CFG_LFHF_SHIFT) | - (found->lock_cnt << VCU_PLL_CFG_LOCK_CNT_SHIFT) | - (found->lock_dly << VCU_PLL_CFG_LOCK_DLY_SHIFT); - xvcu_write(xvcu->vcu_slcr_ba, VCU_PLL_CFG, cfg_val); - - return 0; + return xvcu_pll_set_rate(xvcu, fvco, refclk); } /** @@ -452,27 +517,7 @@ static int xvcu_set_pll(struct xvcu_device *xvcu) return ret; } - xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, - 1, VCU_PLL_CTRL_BYPASS_MASK, - VCU_PLL_CTRL_BYPASS_SHIFT); - xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, - 1, VCU_PLL_CTRL_RESET_MASK, - VCU_PLL_CTRL_RESET_SHIFT); - xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, - 0, VCU_PLL_CTRL_RESET_MASK, - VCU_PLL_CTRL_RESET_SHIFT); - - ret = xvcu_pll_wait_for_lock(xvcu); - if (ret) { - dev_err(xvcu->dev, "PLL is not locked\n"); - return ret; - } - - xvcu_write_field_reg(xvcu->vcu_slcr_ba, VCU_PLL_CTRL, - 0, VCU_PLL_CTRL_BYPASS_MASK, - VCU_PLL_CTRL_BYPASS_SHIFT); - - return ret; + return xvcu_pll_enable(xvcu); } /** @@ -555,12 +600,6 @@ static int xvcu_probe(struct platform_device *pdev) return ret; } - ret = clk_prepare_enable(xvcu->pll_ref); - if (ret) { - dev_err(&pdev->dev, "pll_ref clock enable failed\n"); - goto error_aclk; - } - /* * Do the Gasket isolation and put the VCU out of reset * Bit 0 : Gasket isolation @@ -580,8 +619,6 @@ static int xvcu_probe(struct platform_device *pdev) return 0; error_pll_ref: - clk_disable_unprepare(xvcu->pll_ref); -error_aclk: clk_disable_unprepare(xvcu->aclk); return ret; } @@ -605,7 +642,7 @@ static int xvcu_remove(struct platform_device *pdev) /* Add the the Gasket isolation and put the VCU in reset. */ regmap_write(xvcu->logicore_reg_ba, VCU_GASKET_INIT, 0); - clk_disable_unprepare(xvcu->pll_ref); + xvcu_pll_disable(xvcu); clk_disable_unprepare(xvcu->aclk); return 0; |