[PATCH V2 07/12] clk: tegra: support for Tegra210 clocks suspend-resume

From: Sowjanya Komatineni
Date: Tue May 28 2019 - 19:12:46 EST

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This patch adds system suspend and resume support for Tegra210
clocks.

Signed-off-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
---
drivers/clk/tegra/clk-tegra210.c | 382 +++++++++++++++++++++++++++++++++++++++
1 file changed, 382 insertions(+)

diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
index ed3c7df75d1e..d012b53ca132 100644
--- a/drivers/clk/tegra/clk-tegra210.c
+++ b/drivers/clk/tegra/clk-tegra210.c
@@ -20,10 +20,12 @@
#include <linux/clkdev.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_platform.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/clk/tegra.h>
+#include <linux/syscore_ops.h>
#include <dt-bindings/clock/tegra210-car.h>
#include <dt-bindings/reset/tegra210-car.h>
#include <linux/iopoll.h>
@@ -31,6 +33,7 @@
#include <soc/tegra/pmc.h>

#include "clk.h"
+#include "clk-dfll.h"
#include "clk-id.h"

/*
@@ -48,6 +51,9 @@
#define CLK_SOURCE_SDMMC2 0x154
#define CLK_SOURCE_SDMMC4 0x164

+#define CLK_OUT_ENB_Y 0x298
+#define CLK_ENB_PLLP_OUT_CPU BIT(31)
+
#define PLLC_BASE 0x80
#define PLLC_OUT 0x84
#define PLLC_MISC0 0x88
@@ -71,6 +77,8 @@
#define PLLM_MISC1 0x98
#define PLLM_MISC2 0x9c
#define PLLP_BASE 0xa0
+#define PLLP_OUTA 0xa4
+#define PLLP_OUTB 0xa8
#define PLLP_MISC0 0xac
#define PLLP_MISC1 0x680
#define PLLA_BASE 0xb0
@@ -227,9 +235,18 @@
#define XUSB_PLL_CFG0_UTMIPLL_LOCK_DLY 0x3ff
#define XUSB_PLL_CFG0_PLLU_LOCK_DLY_MASK (0x3ff << 14)

+#define SCLK_BURST_POLICY 0x28
+#define SYSTEM_CLK_RATE 0x30
+#define CLK_MASK_ARM 0x44
+#define MISC_CLK_ENB 0x48
+#define CCLKG_BURST_POLICY 0x368
+#define CCLKLP_BURST_POLICY 0x370
+#define CPU_SOFTRST_CTRL 0x380
+#define SYS_CLK_DIV 0x400
#define SPARE_REG0 0x55c
#define CLK_M_DIVISOR_SHIFT 2
#define CLK_M_DIVISOR_MASK 0x3
+#define BURST_POLICY_REG_SIZE 2

#define RST_DFLL_DVCO 0x2f4
#define DVFS_DFLL_RESET_SHIFT 0
@@ -3381,6 +3398,367 @@ static struct tegra_clk_init_table init_table[] __initdata = {
{ TEGRA210_CLK_CLK_MAX, TEGRA210_CLK_CLK_MAX, 0, 0 },
};

+#ifdef CONFIG_PM_SLEEP
+static unsigned long pll_c_rate, pll_c2_rate, pll_c3_rate, pll_x_rate;
+static unsigned long pll_c4_rate, pll_d2_rate, pll_dp_rate;
+static unsigned long pll_re_vco_rate, pll_d_rate, pll_a_rate, pll_a1_rate;
+static unsigned long pll_c_out1_rate;
+static unsigned long pll_a_out0_rate, pll_c4_out3_rate;
+static unsigned long pll_p_out_rate[5];
+static unsigned long pll_u_out1_rate, pll_u_out2_rate;
+static unsigned long pll_mb_rate;
+static u32 pll_m_v;
+static u32 pll_p_outa, pll_p_outb;
+static u32 pll_re_out_div, pll_re_out_1;
+static u32 cpu_softrst_ctx[3];
+static u32 cclkg_burst_policy_ctx[2];
+static u32 cclklp_burst_policy_ctx[2];
+static u32 sclk_burst_policy_ctx[3];
+static u32 sclk_ctx, spare_ctx, misc_clk_enb_ctx, clk_arm_ctx;
+
+static struct platform_device *dfll_pdev;
+#define car_readl(_base, _off) \
+ readl_relaxed(clk_base + (_base) + ((_off) * 4))
+#define car_writel(_val, _base, _off) \
+ writel_relaxed(_val, clk_base + (_base) + ((_off) * 4))
+
+static u32 *periph_clk_src_ctx;
+struct periph_source_bank {
+ u32 start;
+ u32 end;
+};
+
+static struct periph_source_bank periph_srcs[] = {
+ [0] = {
+ .start = 0x100,
+ .end = 0x198,
+ },
+ [1] = {
+ .start = 0x1a0,
+ .end = 0x1f8,
+ },
+ [2] = {
+ .start = 0x3b4,
+ .end = 0x42c,
+ },
+ [3] = {
+ .start = 0x49c,
+ .end = 0x4b4,
+ },
+ [4] = {
+ .start = 0x560,
+ .end = 0x564,
+ },
+ [5] = {
+ .start = 0x600,
+ .end = 0x678,
+ },
+ [6] = {
+ .start = 0x694,
+ .end = 0x6a0,
+ },
+ [7] = {
+ .start = 0x6b8,
+ .end = 0x718,
+ },
+};
+
+/* This array lists the valid clocks for each periph clk bank */
+static u32 periph_clks_on[] = {
+ 0xdcd7dff9,
+ 0x87d1f3e7,
+ 0xf3fed3fa,
+ 0xffc18cfb,
+ 0x793fb7ff,
+ 0x3fe66fff,
+ 0xfc1fc7ff,
+};
+
+static inline unsigned long clk_get_rate_nolock(struct clk *clk)
+{
+ if (IS_ERR_OR_NULL(clk)) {
+ WARN_ON(1);
+ return 0;
+ }
+
+ return clk_hw_get_rate(__clk_get_hw(clk));
+}
+
+static inline struct clk *pll_p_clk(unsigned int x)
+{
+ if (x < 4) {
+ return clks[TEGRA210_CLK_PLL_P_OUT1 + x];
+ } else if (x != 4) {
+ WARN_ON(1);
+ return NULL;
+ } else {
+ return clks[TEGRA210_CLK_PLL_P_OUT5];
+ }
+}
+
+static u32 * __init tegra210_init_suspend_ctx(void)
+{
+ int i, size = 0;
+
+ for (i = 0; i < ARRAY_SIZE(periph_srcs); i++)
+ size += periph_srcs[i].end - periph_srcs[i].start + 4;
+
+ periph_clk_src_ctx = kmalloc(size, GFP_KERNEL);
+
+ return periph_clk_src_ctx;
+}
+
+static int tegra210_clk_suspend(void)
+{
+ int i;
+ unsigned long off;
+ struct device_node *node;
+ u32 *clk_rst_ctx = periph_clk_src_ctx;
+ u32 val;
+
+ pll_a_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_A]);
+ pll_a_out0_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_A_OUT0]);
+ pll_a1_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_A1]);
+ pll_c2_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_C2]);
+ pll_c3_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_C3]);
+ pll_c_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_C]);
+ pll_c_out1_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_C_OUT1]);
+ pll_x_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_X]);
+ pll_c4_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_C4]);
+ pll_c4_out3_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_C4_OUT3]);
+ pll_dp_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_DP]);
+ pll_d_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_D]);
+ pll_d2_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_D2]);
+ pll_re_vco_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_RE_VCO]);
+ pll_re_out_div = car_readl(PLLRE_BASE, 0) & (0xf << 16);
+ pll_re_out_1 = car_readl(PLLRE_OUT1, 0);
+ pll_u_out1_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_U_OUT1]);
+ pll_u_out2_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_U_OUT2]);
+ pll_mb_rate = clk_get_rate_nolock(clks[TEGRA210_CLK_PLL_MB]);
+ pll_m_v = car_readl(PLLM_BASE, 0);
+ pll_p_outa = car_readl(PLLP_OUTA, 0);
+ pll_p_outb = car_readl(PLLP_OUTB, 0);
+
+ for (i = 0; i < ARRAY_SIZE(cpu_softrst_ctx); i++)
+ cpu_softrst_ctx[i] = car_readl(CPU_SOFTRST_CTRL, i);
+
+ for (i = 0; i < ARRAY_SIZE(pll_p_out_rate); i++)
+ pll_p_out_rate[i] = clk_get_rate_nolock(pll_p_clk(i));
+
+ for (i = 0; i < BURST_POLICY_REG_SIZE; i++) {
+ cclkg_burst_policy_ctx[i] = car_readl(CCLKG_BURST_POLICY, i);
+ cclklp_burst_policy_ctx[i] = car_readl(CCLKLP_BURST_POLICY, i);
+ sclk_burst_policy_ctx[i] = car_readl(SCLK_BURST_POLICY, i);
+ }
+ sclk_burst_policy_ctx[i] = car_readl(SYS_CLK_DIV, 0);
+
+ sclk_ctx = car_readl(SYSTEM_CLK_RATE, 0);
+ spare_ctx = car_readl(SPARE_REG0, 0);
+ misc_clk_enb_ctx = car_readl(MISC_CLK_ENB, 0);
+ clk_arm_ctx = car_readl(CLK_MASK_ARM, 0);
+
+ for (i = 0; i < ARRAY_SIZE(periph_srcs); i++)
+ for (off = periph_srcs[i].start; off <= periph_srcs[i].end;
+ off += 4)
+ *clk_rst_ctx++ = car_readl(off, 0);
+
+ if (!dfll_pdev) {
+ node = of_find_compatible_node(NULL, NULL,
+ "nvidia,tegra210-dfll");
+ if (node)
+ dfll_pdev = of_find_device_by_node(node);
+ of_node_put(node);
+ if (!dfll_pdev)
+ pr_err("dfll node not found. no suspend for dfll\n");
+ }
+
+ if (dfll_pdev)
+ tegra_dfll_suspend(dfll_pdev);
+
+ /* Enable PLLP_OUT_CPU after dfll suspend */
+ val = car_readl(CLK_OUT_ENB_Y, 0);
+ val |= CLK_ENB_PLLP_OUT_CPU;
+ car_writel(val, CLK_OUT_ENB_Y, 0);
+
+ tegra_clk_periph_suspend(clk_base);
+ return 0;
+}
+
+static void tegra210_clk_resume(void)
+{
+ int i;
+ unsigned long off;
+ u32 val;
+ u32 *clk_rst_ctx = periph_clk_src_ctx;
+ struct clk_hw *parent;
+
+ tegra_clk_osc_resume(clk_base);
+
+ for (i = 0; i < ARRAY_SIZE(cpu_softrst_ctx); i++)
+ car_writel(cpu_softrst_ctx[i], CPU_SOFTRST_CTRL, i);
+
+ /*
+ * Since we are going to reset devices and switch clock sources in this
+ * function, plls and secondary dividers is required to be enabled. The
+ * actual value will be restored back later.
+ */
+ tegra_clk_pll_out_resume(clks[TEGRA210_CLK_PLL_P_OUT1],
+ pll_p_out_rate[0]);
+ tegra_clk_pll_out_resume(clks[TEGRA210_CLK_PLL_P_OUT3],
+ pll_p_out_rate[2]);
+ tegra_clk_pll_out_resume(clks[TEGRA210_CLK_PLL_P_OUT4],
+ pll_p_out_rate[3]);
+ tegra_clk_pll_out_resume(clks[TEGRA210_CLK_PLL_P_OUT5],
+ pll_p_out_rate[4]);
+
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_A1], pll_a1_rate);
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_C2], pll_c2_rate);
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_C3], pll_c3_rate);
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_C], pll_c_rate);
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_X], pll_x_rate);
+
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_A], pll_a_rate);
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_D], pll_d_rate);
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_D2], pll_d2_rate);
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_DP], pll_dp_rate);
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_C4], pll_c4_rate);
+
+ /* enable the PLLD */
+ val = car_readl(PLLD_MISC0, 0);
+ val |= PLLD_MISC0_DSI_CLKENABLE;
+ car_writel(val, PLLD_MISC0, 0);
+
+ /* reprogram PLLRE post divider, VCO, 2ndary divider (in this order) */
+ if (!__clk_is_enabled(clks[TEGRA210_CLK_PLL_RE_VCO])) {
+ val = car_readl(PLLRE_BASE, 0);
+ val &= ~(0xf << 16);
+ car_writel(val | pll_re_out_div, PLLRE_BASE, 0);
+ }
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_RE_VCO], pll_re_vco_rate);
+
+ car_writel(pll_re_out_1, PLLRE_OUT1, 0);
+
+ /* resume PLLU */
+ tegra210_init_pllu();
+
+ tegra_clk_pll_out_resume(clks[TEGRA210_CLK_PLL_U_OUT1],
+ pll_u_out1_rate);
+ tegra_clk_pll_out_resume(clks[TEGRA210_CLK_PLL_U_OUT2],
+ pll_u_out2_rate);
+
+ tegra_clk_pll_out_resume(clks[TEGRA210_CLK_PLL_C_OUT1],
+ pll_c_out1_rate);
+ tegra_clk_pll_out_resume(clks[TEGRA210_CLK_PLL_A_OUT0],
+ pll_a_out0_rate);
+ tegra_clk_pll_out_resume(clks[TEGRA210_CLK_PLL_C4_OUT3],
+ pll_c4_out3_rate);
+ /*
+ * resume SCLK and CPULP clocks
+ * for SCLk 1st set safe dividers values, then restore source,
+ * then restore dividers
+ */
+ car_writel(0x1, SYSTEM_CLK_RATE, 0);
+ val = car_readl(SYS_CLK_DIV, 0);
+ i = BURST_POLICY_REG_SIZE;
+ if (val < sclk_burst_policy_ctx[i])
+ car_writel(sclk_burst_policy_ctx[i], SYS_CLK_DIV, 0);
+ fence_udelay(2, clk_base);
+ for (i = 0; i < BURST_POLICY_REG_SIZE; i++) {
+ car_writel(cclklp_burst_policy_ctx[i], CCLKLP_BURST_POLICY, i);
+ car_writel(sclk_burst_policy_ctx[i], SCLK_BURST_POLICY, i);
+ }
+ car_writel(sclk_burst_policy_ctx[i], SYS_CLK_DIV, 0);
+
+ car_writel(sclk_ctx, SYSTEM_CLK_RATE, 0);
+ car_writel(spare_ctx, SPARE_REG0, 0);
+ car_writel(misc_clk_enb_ctx, MISC_CLK_ENB, 0);
+ car_writel(clk_arm_ctx, CLK_MASK_ARM, 0);
+
+ /* enable all clocks before configuring clock sources */
+ tegra_clk_periph_force_on(periph_clks_on, ARRAY_SIZE(periph_clks_on),
+ clk_base);
+
+ wmb();
+ fence_udelay(2, clk_base);
+
+ for (i = 0; i < ARRAY_SIZE(periph_srcs); i++)
+ for (off = periph_srcs[i].start; off <= periph_srcs[i].end;
+ off += 4)
+ car_writel(*clk_rst_ctx++, off, 0);
+
+ /* propagate and restore resets, restore clock state */
+ fence_udelay(5, clk_base);
+ tegra_clk_periph_resume(clk_base);
+
+ /* restore (sync) the actual PLL and secondary divider values */
+ car_writel(pll_p_outa, PLLP_OUTA, 0);
+ car_writel(pll_p_outb, PLLP_OUTB, 0);
+
+ tegra_clk_sync_state_pll_out(clks[TEGRA210_CLK_PLL_U_OUT1]);
+ tegra_clk_sync_state_pll_out(clks[TEGRA210_CLK_PLL_U_OUT2]);
+
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_A1]);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_C2]);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_C3]);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_C]);
+
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_RE_VCO]);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_C4]);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_D2]);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_DP]);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_A]);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_D]);
+
+ tegra_clk_sync_state_pll_out(clks[TEGRA210_CLK_PLL_C_OUT1]);
+ tegra_clk_sync_state_pll_out(clks[TEGRA210_CLK_PLL_A_OUT0]);
+
+ /*
+ * restore CPUG clocks:
+ * - enable DFLL in open loop mode
+ * - switch CPUG to DFLL clock source
+ * - close DFLL loop
+ * - sync PLLX state
+ */
+ if (dfll_pdev)
+ tegra_dfll_resume(dfll_pdev, false);
+
+ for (i = 0; i < BURST_POLICY_REG_SIZE; i++)
+ car_writel(cclkg_burst_policy_ctx[i], CCLKG_BURST_POLICY, i);
+ fence_udelay(2, clk_base);
+
+ if (dfll_pdev)
+ tegra_dfll_resume(dfll_pdev, true);
+
+ parent = clk_hw_get_parent(__clk_get_hw(clks[TEGRA210_CLK_CCLK_G]));
+ if (parent != __clk_get_hw(clks[TEGRA210_CLK_PLL_X]))
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_X]);
+
+ /* Disable PLL_OUT_CPU after DFLL resume */
+ val = car_readl(CLK_OUT_ENB_Y, 0);
+ val &= ~CLK_ENB_PLLP_OUT_CPU;
+ car_writel(val, CLK_OUT_ENB_Y, 0);
+
+ car_writel(pll_m_v, PLLM_BASE, 0);
+ tegra_clk_pll_resume(clks[TEGRA210_CLK_PLL_MB], pll_mb_rate);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_M]);
+ tegra_clk_sync_state_pll(clks[TEGRA210_CLK_PLL_MB]);
+
+ tegra_clk_plle_tegra210_resume(clks[TEGRA210_CLK_PLL_E]);
+}
+#else
+#define tegra210_clk_suspend NULL
+#define tegra210_clk_resume NULL
+static inline u32 *tegra210_init_suspend_ctx(void)
+{
+ return NULL;
+}
+#endif
+
+static struct syscore_ops tegra_clk_syscore_ops = {
+ .suspend = tegra210_clk_suspend,
+ .resume = tegra210_clk_resume,
+};
+
/**
* tegra210_clock_apply_init_table - initialize clocks on Tegra210 SoCs
*
@@ -3591,5 +3969,9 @@ static void __init tegra210_clock_init(struct device_node *np)
tegra210_mbist_clk_init();

tegra_cpu_car_ops = &tegra210_cpu_car_ops;
+
+ if (tegra210_init_suspend_ctx())
+ register_syscore_ops(&tegra_clk_syscore_ops);
+
}
CLK_OF_DECLARE(tegra210, "nvidia,tegra210-car", tegra210_clock_init);
--
2.7.4

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