[PATCH 1/3] [ARM] tegra: add PCI Express clocks

From: mike@compulab•co.il (Mike Rapoport)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 1/3] [ARM] tegra: add PCI Express clocks
Date: Sun, 19 Sep 2010 09:52:44 +0200	[thread overview]
Message-ID: <4C95C14C.20107@compulab.co.il> (raw)
In-Reply-To: <AANLkTi=ioZa3JpsSci5Yavaij9dT=R+Nf4VRiUAH4ZN7@mail.gmail.com>

Mogambo Park wrote:
> Good evening Mike Rapport,
> 
>  Are there is some datasheet/TRM availability for Nvidia Tegra chip ?
> Please say me if yes and where.

The Tegra docs are available only under NDA.

> 
> thanks
> 
> On Fri, Sep 17, 2010 at 1:53 AM, Mike Rapoport <mike@compulab•co.il> wrote:
>> Signed-off-by: Mike Rapoport <mike@compulab•co.il>
>> ---
>>  arch/arm/mach-tegra/tegra2_clocks.c |   76 +++++++++++++++++++++++++++++++++-
>>  1 files changed, 73 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/mach-tegra/tegra2_clocks.c b/arch/arm/mach-tegra/tegra2_clocks.c
>> index 4261632..44f1b81 100644
>> --- a/arch/arm/mach-tegra/tegra2_clocks.c
>> +++ b/arch/arm/mach-tegra/tegra2_clocks.c
>> @@ -92,6 +92,8 @@
>>  #define PLLD_MISC_DIV_RST              (1<<23)
>>  #define PLLD_MISC_DCCON_SHIFT          12
>>
>> +#define PLLE_MISC_READY                        (1 << 15)
>> +
>>  #define PERIPH_CLK_TO_ENB_REG(c)       ((c->clk_num / 32) * 4)
>>  #define PERIPH_CLK_TO_ENB_SET_REG(c)   ((c->clk_num / 32) * 8)
>>  #define PERIPH_CLK_TO_ENB_BIT(c)       (1 << (c->clk_num % 32))
>> @@ -356,12 +358,12 @@ static unsigned long tegra2_pll_clk_recalculate_rate(struct clk *c)
>>        return c->rate;
>>  }
>>
>> -static int tegra2_pll_clk_wait_for_lock(struct clk *c)
>> +static int tegra2_pll_clk_wait_for_bit_set(struct clk *c, int bit)
>>  {
>>        ktime_t before;
>>
>>        before = ktime_get();
>> -       while (!(clk_readl(c->reg + PLL_BASE) & PLL_BASE_LOCK)) {
>> +       while (!(clk_readl(c->reg + PLL_BASE) & bit)) {
>>                if (ktime_us_delta(ktime_get(), before) > 5000) {
>>                        pr_err("Timed out waiting for lock bit on pll %s",
>>                                c->name);
>> @@ -414,7 +416,7 @@ static int tegra2_pll_clk_enable(struct clk *c)
>>        val |= PLL_MISC_LOCK_ENABLE;
>>        clk_writel(val, c->reg + PLL_MISC(c));
>>
>> -       tegra2_pll_clk_wait_for_lock(c);
>> +       tegra2_pll_clk_wait_for_bit_set(c, PLL_BASE_LOCK);
>>
>>        return 0;
>>  }
>> @@ -754,6 +756,34 @@ static struct clk_ops tegra_clk_double_ops = {
>>        .recalculate_rate       = &tegra2_clk_recalculate_rate,
>>  };
>>
>> +/* PCI Express clock ops */
>> +static int tegra2_plle_clk_enable(struct clk *c)
>> +{
>> +       u32 val;
>> +
>> +       pr_debug("%s on clock %s\n", __func__, c->name);
>> +
>> +       if (tegra2_pll_clk_wait_for_bit_set(c, PLLE_MISC_READY))
>> +               return -EBUSY;
>> +
>> +       val = clk_readl(c->reg + PLL_BASE);
>> +       val |= PLL_BASE_ENABLE | PLL_BASE_BYPASS;
>> +       clk_writel(val, c->reg + PLL_BASE);
>> +
>> +       return 0;
>> +}
>> +
>> +static struct clk_ops tegra_plle_ops = {
>> +       .init       = tegra2_pll_clk_init,
>> +       .enable     = tegra2_plle_clk_enable,
>> +       .set_rate   = tegra2_pll_clk_set_rate,
>> +};
>> +
>> +static struct clk_ops tegra_pcie_clk_ops = {
>> +       .enable     = tegra2_periph_clk_enable,
>> +       .disable    = tegra2_periph_clk_disable,
>> +};
>> +
>>  /* Clock definitions */
>>  static struct clk tegra_clk_32k = {
>>        .name = "clk_32k",
>> @@ -1109,6 +1139,42 @@ static struct clk tegra_clk_pclk = {
>>        .ops            = &tegra_bus_ops,
>>  };
>>
>> +/* PCI Express clocks */
>> +static struct clk_pll_table tegra_pll_e_table[] = {
>> +       { 12000000, 100000000,  200,  24, 1, 0 },
>> +};
>> +
>> +static struct clk tegra_pll_e = {
>> +       .name      = "pll_e",
>> +       .flags     = PLL_ALT_MISC_REG,
>> +       .ops       = &tegra_plle_ops,
>> +       .input_min = 12000000,
>> +       .input_max = 12000000,
>> +       .parent    = &tegra_clk_m,
>> +       .reg       = 0xe8,
>> +       .pll_table = tegra_pll_e_table,
>> +};
>> +
>> +static struct clk tegra_clk_pex = {
>> +       .name      = "pex",
>> +       .flags     = PERIPH_MANUAL_RESET,
>> +       .ops       = &tegra_pcie_clk_ops,
>> +       .clk_num   = 70,
>> +};
>> +
>> +static struct clk tegra_clk_afi = {
>> +       .name      = "afi",
>> +       .flags     = PERIPH_MANUAL_RESET,
>> +       .ops       = &tegra_pcie_clk_ops,
>> +       .clk_num   = 72,
>> +};
>> +
>> +/* the pcie_xclk is required for reset of PCIE subsystem */
>> +static struct clk tegra_clk_pcie_xclk = {
>> +       .name      = "pcie_xclk",
>> +       .clk_num   = 74,
>> +};
>> +
>>  static struct clk_mux_sel mux_pllm_pllc_pllp_plla[] = {
>>        { .input = &tegra_pll_m, .value = 0},
>>        { .input = &tegra_pll_c, .value = 1},
>> @@ -1315,11 +1381,15 @@ struct clk_lookup tegra_clk_lookups[] = {
>>        CLK(NULL,       "pll_d_out0",   &tegra_pll_d_out0),
>>        CLK(NULL,       "pll_u",        &tegra_pll_u),
>>        CLK(NULL,       "pll_x",        &tegra_pll_x),
>> +       CLK(NULL,       "pll_e",        &tegra_pll_e),
>>        CLK(NULL,       "cpu",          &tegra_clk_cpu),
>>        CLK(NULL,       "sys",          &tegra_clk_sys),
>>        CLK(NULL,       "hclk",         &tegra_clk_hclk),
>>        CLK(NULL,       "pclk",         &tegra_clk_pclk),
>>        CLK(NULL,       "clk_d",        &tegra_clk_d),
>> +       CLK(NULL,       "pcie_xclk",    &tegra_clk_pcie_xclk),
>> +       CLK(NULL,       "pex",          &tegra_clk_pex),
>> +       CLK(NULL,       "afi",          &tegra_clk_afi),
>>  };
>>
>>  void __init tegra2_init_clocks(void)
>> --
>> 1.6.6.2
>>
>>
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>>

-- 
Sincerely yours,
Mike.