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path: root/drivers/clk/tegra/clk-tegra30.c
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Diffstat (limited to 'drivers/clk/tegra/clk-tegra30.c')
-rw-r--r--drivers/clk/tegra/clk-tegra30.c116
1 files changed, 85 insertions, 31 deletions
diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
index 64121bc66d85..04b496123820 100644
--- a/drivers/clk/tegra/clk-tegra30.c
+++ b/drivers/clk/tegra/clk-tegra30.c
@@ -7,8 +7,11 @@
#include <linux/delay.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
+#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
#include <linux/clk/tegra.h>
#include <soc/tegra/pmc.h>
@@ -532,7 +535,7 @@ static unsigned long tegra30_input_freq[] = {
[12] = 26000000,
};
-static struct tegra_devclk devclks[] __initdata = {
+static struct tegra_devclk devclks[] = {
{ .con_id = "pll_c", .dt_id = TEGRA30_CLK_PLL_C },
{ .con_id = "pll_c_out1", .dt_id = TEGRA30_CLK_PLL_C_OUT1 },
{ .con_id = "pll_p", .dt_id = TEGRA30_CLK_PLL_P },
@@ -812,11 +815,6 @@ static void __init tegra30_pll_init(void)
{
struct clk *clk;
- /* PLLC */
- clk = tegra_clk_register_pll("pll_c", "pll_ref", clk_base, pmc_base, 0,
- &pll_c_params, NULL);
- clks[TEGRA30_CLK_PLL_C] = clk;
-
/* PLLC_OUT1 */
clk = tegra_clk_register_divider("pll_c_out1_div", "pll_c",
clk_base + PLLC_OUT, 0, TEGRA_DIVIDER_ROUND_UP,
@@ -826,11 +824,6 @@ static void __init tegra30_pll_init(void)
0, NULL);
clks[TEGRA30_CLK_PLL_C_OUT1] = clk;
- /* PLLM */
- clk = tegra_clk_register_pll("pll_m", "pll_ref", clk_base, pmc_base,
- CLK_SET_RATE_GATE, &pll_m_params, NULL);
- clks[TEGRA30_CLK_PLL_M] = clk;
-
/* PLLM_OUT1 */
clk = tegra_clk_register_divider("pll_m_out1_div", "pll_m",
clk_base + PLLM_OUT, 0, TEGRA_DIVIDER_ROUND_UP,
@@ -880,9 +873,6 @@ static void __init tegra30_pll_init(void)
ARRAY_SIZE(pll_e_parents),
CLK_SET_RATE_NO_REPARENT,
clk_base + PLLE_AUX, 2, 1, 0, NULL);
- clk = tegra_clk_register_plle("pll_e", "pll_e_mux", clk_base, pmc_base,
- CLK_GET_RATE_NOCACHE, &pll_e_params, NULL);
- clks[TEGRA30_CLK_PLL_E] = clk;
}
static const char *cclk_g_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
@@ -971,14 +961,6 @@ static void __init tegra30_super_clk_init(void)
NULL);
clks[TEGRA30_CLK_CCLK_LP] = clk;
- /* SCLK */
- clk = tegra_clk_register_super_mux("sclk", sclk_parents,
- ARRAY_SIZE(sclk_parents),
- CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
- clk_base + SCLK_BURST_POLICY,
- 0, 4, 0, 0, NULL);
- clks[TEGRA30_CLK_SCLK] = clk;
-
/* twd */
clk = clk_register_fixed_factor(NULL, "twd", "cclk_g",
CLK_SET_RATE_PARENT, 1, 2);
@@ -1214,7 +1196,7 @@ static struct tegra_cpu_car_ops tegra30_cpu_car_ops = {
#endif
};
-static struct tegra_clk_init_table init_table[] __initdata = {
+static struct tegra_clk_init_table init_table[] = {
{ TEGRA30_CLK_UARTA, TEGRA30_CLK_PLL_P, 408000000, 0 },
{ TEGRA30_CLK_UARTB, TEGRA30_CLK_PLL_P, 408000000, 0 },
{ TEGRA30_CLK_UARTC, TEGRA30_CLK_PLL_P, 408000000, 0 },
@@ -1259,11 +1241,6 @@ static struct tegra_clk_init_table init_table[] __initdata = {
{ TEGRA30_CLK_CLK_MAX, TEGRA30_CLK_CLK_MAX, 0, 0 },
};
-static void __init tegra30_clock_apply_init_table(void)
-{
- tegra_init_from_table(init_table, clks, TEGRA30_CLK_CLK_MAX);
-}
-
/*
* Some clocks may be used by different drivers depending on the board
* configuration. List those here to register them twice in the clock lookup
@@ -1294,12 +1271,24 @@ static struct tegra_audio_clk_info tegra30_audio_plls[] = {
{ "pll_a", &pll_a_params, tegra_clk_pll_a, "pll_p_out1" },
};
+static bool tegra30_car_initialized;
+
static struct clk *tegra30_clk_src_onecell_get(struct of_phandle_args *clkspec,
void *data)
{
struct clk_hw *hw;
struct clk *clk;
+ /*
+ * Timer clocks are needed early, the rest of the clocks shouldn't be
+ * available to device drivers until clock tree is fully initialized.
+ */
+ if (clkspec->args[0] != TEGRA30_CLK_RTC &&
+ clkspec->args[0] != TEGRA30_CLK_TWD &&
+ clkspec->args[0] != TEGRA30_CLK_TIMER &&
+ !tegra30_car_initialized)
+ return ERR_PTR(-EPROBE_DEFER);
+
clk = of_clk_src_onecell_get(clkspec, data);
if (IS_ERR(clk))
return clk;
@@ -1357,10 +1346,75 @@ static void __init tegra30_clock_init(struct device_node *np)
tegra_init_dup_clks(tegra_clk_duplicates, clks, TEGRA30_CLK_CLK_MAX);
tegra_add_of_provider(np, tegra30_clk_src_onecell_get);
+
+ tegra_cpu_car_ops = &tegra30_cpu_car_ops;
+}
+CLK_OF_DECLARE_DRIVER(tegra30, "nvidia,tegra30-car", tegra30_clock_init);
+
+/*
+ * Clocks that use runtime PM can't be created at the tegra30_clock_init
+ * time because drivers' base isn't initialized yet, and thus platform
+ * devices can't be created for the clocks. Hence we need to split the
+ * registration of the clocks into two phases. The first phase registers
+ * essential clocks which don't require RPM and are actually used during
+ * early boot. The second phase registers clocks which use RPM and this
+ * is done when device drivers' core API is ready.
+ */
+static int tegra30_car_probe(struct platform_device *pdev)
+{
+ struct clk *clk;
+
+ /* PLLC */
+ clk = tegra_clk_register_pll("pll_c", "pll_ref", clk_base, pmc_base, 0,
+ &pll_c_params, NULL);
+ clks[TEGRA30_CLK_PLL_C] = clk;
+
+ /* PLLE */
+ clk = tegra_clk_register_plle("pll_e", "pll_e_mux", clk_base, pmc_base,
+ CLK_GET_RATE_NOCACHE, &pll_e_params, NULL);
+ clks[TEGRA30_CLK_PLL_E] = clk;
+
+ /* PLLM */
+ clk = tegra_clk_register_pll("pll_m", "pll_ref", clk_base, pmc_base,
+ CLK_SET_RATE_GATE, &pll_m_params, NULL);
+ clks[TEGRA30_CLK_PLL_M] = clk;
+
+ /* SCLK */
+ clk = tegra_clk_register_super_mux("sclk", sclk_parents,
+ ARRAY_SIZE(sclk_parents),
+ CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
+ clk_base + SCLK_BURST_POLICY,
+ 0, 4, 0, 0, NULL);
+ clks[TEGRA30_CLK_SCLK] = clk;
+
tegra_register_devclks(devclks, ARRAY_SIZE(devclks));
+ tegra_init_from_table(init_table, clks, TEGRA30_CLK_CLK_MAX);
+ tegra30_car_initialized = true;
- tegra_clk_apply_init_table = tegra30_clock_apply_init_table;
+ return 0;
+}
- tegra_cpu_car_ops = &tegra30_cpu_car_ops;
+static const struct of_device_id tegra30_car_match[] = {
+ { .compatible = "nvidia,tegra30-car" },
+ { }
+};
+
+static struct platform_driver tegra30_car_driver = {
+ .driver = {
+ .name = "tegra30-car",
+ .of_match_table = tegra30_car_match,
+ .suppress_bind_attrs = true,
+ },
+ .probe = tegra30_car_probe,
+};
+
+/*
+ * Clock driver must be registered before memory controller driver,
+ * which doesn't support deferred probing for today and is registered
+ * from arch init-level.
+ */
+static int tegra30_car_init(void)
+{
+ return platform_driver_register(&tegra30_car_driver);
}
-CLK_OF_DECLARE(tegra30, "nvidia,tegra30-car", tegra30_clock_init);
+postcore_initcall(tegra30_car_init);