diff options
| author | Rhyland Klein <rklein@nvidia.com> | 2015-06-18 23:28:29 +0200 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2015-12-17 13:37:53 +0100 |
| commit | 6929715cf6b944d8f88beb2aa25658084de106ab (patch) | |
| tree | d2115c728dc40f5430acd8827c9b9af00f8bab2c /drivers/clk/tegra/clk-pll.c | |
| parent | clk: tegra: pll: Add specialized logic for Tegra210 (diff) | |
| download | linux-6929715cf6b944d8f88beb2aa25658084de106ab.tar.xz linux-6929715cf6b944d8f88beb2aa25658084de106ab.zip | |
clk: tegra: pll: Add support for PLLMB for Tegra210
Tegra210 SoC's have 2 PLLs for memory usage. Add plumbing to register
and handle PLLMB.
PLLMB is used to allow switching between 2 PLLM's without having to use
and intermediate backup PLL, as we need to lock the PLL before we can
switch to it.
Reviewed-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/clk/tegra/clk-pll.c')
| -rw-r--r-- | drivers/clk/tegra/clk-pll.c | 48 |
1 files changed, 43 insertions, 5 deletions
diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c index 25a89ac28d2c..420ca8284a1d 100644 --- a/drivers/clk/tegra/clk-pll.c +++ b/drivers/clk/tegra/clk-pll.c @@ -571,7 +571,7 @@ static void _update_pll_mnp(struct tegra_clk_pll *pll, struct tegra_clk_pll_params *params = pll->params; struct div_nmp *div_nmp = params->div_nmp; - if ((params->flags & TEGRA_PLLM) && + if ((params->flags & (TEGRA_PLLM | TEGRA_PLLMB)) && (pll_override_readl(PMC_PLLP_WB0_OVERRIDE, pll) & PMC_PLLP_WB0_OVERRIDE_PLLM_OVERRIDE)) { val = pll_override_readl(params->pmc_divp_reg, pll); @@ -608,7 +608,7 @@ static void _get_pll_mnp(struct tegra_clk_pll *pll, struct tegra_clk_pll_params *params = pll->params; struct div_nmp *div_nmp = params->div_nmp; - if ((params->flags & TEGRA_PLLM) && + if ((params->flags & (TEGRA_PLLM | TEGRA_PLLMB)) && (pll_override_readl(PMC_PLLP_WB0_OVERRIDE, pll) & PMC_PLLP_WB0_OVERRIDE_PLLM_OVERRIDE)) { val = pll_override_readl(params->pmc_divp_reg, pll); @@ -729,8 +729,8 @@ static long clk_pll_round_rate(struct clk_hw *hw, unsigned long rate, struct tegra_clk_pll_freq_table cfg; if (pll->params->flags & TEGRA_PLL_FIXED) { - /* PLLM are used for memory; we do not change rate */ - if (pll->params->flags & TEGRA_PLLM) + /* PLLM/MB are used for memory; we do not change rate */ + if (pll->params->flags & (TEGRA_PLLM | TEGRA_PLLMB)) return clk_hw_get_rate(hw); return pll->params->fixed_rate; } @@ -757,7 +757,7 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw, return parent_rate; if ((pll->params->flags & TEGRA_PLL_FIXED) && - !(pll->params->flags & TEGRA_PLLM) && + !(pll->params->flags & (TEGRA_PLLM | TEGRA_PLLMB)) && !(val & PLL_BASE_OVERRIDE)) { struct tegra_clk_pll_freq_table sel; if (_get_table_rate(hw, &sel, pll->params->fixed_rate, @@ -2244,4 +2244,42 @@ struct clk *tegra_clk_register_pllss_tegra210(const char *name, return clk; } + +struct clk *tegra_clk_register_pllmb(const char *name, const char *parent_name, + void __iomem *clk_base, void __iomem *pmc, + unsigned long flags, + struct tegra_clk_pll_params *pll_params, + spinlock_t *lock) +{ + struct tegra_clk_pll *pll; + struct clk *clk, *parent; + unsigned long parent_rate; + + if (!pll_params->pdiv_tohw) + return ERR_PTR(-EINVAL); + + parent = __clk_lookup(parent_name); + if (!parent) { + WARN(1, "parent clk %s of %s must be registered first\n", + parent_name, name); + return ERR_PTR(-EINVAL); + } + + parent_rate = clk_get_rate(parent); + + pll_params->vco_min = _clip_vco_min(pll_params->vco_min, parent_rate); + + pll_params->flags |= TEGRA_PLL_BYPASS; + pll_params->flags |= TEGRA_PLLMB; + pll = _tegra_init_pll(clk_base, pmc, pll_params, lock); + if (IS_ERR(pll)) + return ERR_CAST(pll); + + clk = _tegra_clk_register_pll(pll, name, parent_name, flags, + &tegra_clk_pll_ops); + if (IS_ERR(clk)) + kfree(pll); + + return clk; +} #endif |