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Diffstat (limited to 'arch/arm/mach-imx/clk-imx6sl.c')
-rw-r--r--arch/arm/mach-imx/clk-imx6sl.c179
1 files changed, 151 insertions, 28 deletions
diff --git a/arch/arm/mach-imx/clk-imx6sl.c b/arch/arm/mach-imx/clk-imx6sl.c
index a5c3c5d21ae..5408ca70c8d 100644
--- a/arch/arm/mach-imx/clk-imx6sl.c
+++ b/arch/arm/mach-imx/clk-imx6sl.c
@@ -1,5 +1,5 @@
/*
- * Copyright 2013 Freescale Semiconductor, Inc.
+ * Copyright 2013-2014 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -18,27 +18,43 @@
#include "clk.h"
#include "common.h"
-static const char const *step_sels[] = { "osc", "pll2_pfd2", };
-static const char const *pll1_sw_sels[] = { "pll1_sys", "step", };
-static const char const *ocram_alt_sels[] = { "pll2_pfd2", "pll3_pfd1", };
-static const char const *ocram_sels[] = { "periph", "ocram_alt_sels", };
-static const char const *pre_periph_sels[] = { "pll2_bus", "pll2_pfd2", "pll2_pfd0", "pll2_198m", };
-static const char const *periph_clk2_sels[] = { "pll3_usb_otg", "osc", "osc", "dummy", };
-static const char const *periph2_clk2_sels[] = { "pll3_usb_otg", "pll2_bus", };
-static const char const *periph_sels[] = { "pre_periph_sel", "periph_clk2_podf", };
-static const char const *periph2_sels[] = { "pre_periph2_sel", "periph2_clk2_podf", };
-static const char const *csi_lcdif_sels[] = { "mmdc", "pll2_pfd2", "pll3_120m", "pll3_pfd1", };
-static const char const *usdhc_sels[] = { "pll2_pfd2", "pll2_pfd0", };
-static const char const *ssi_sels[] = { "pll3_pfd2", "pll3_pfd3", "pll4_post_div", "dummy", };
-static const char const *perclk_sels[] = { "ipg", "osc", };
-static const char const *epdc_pxp_sels[] = { "mmdc", "pll3_usb_otg", "pll5_video_div", "pll2_pfd0", "pll2_pfd2", "pll3_pfd1", };
-static const char const *gpu2d_ovg_sels[] = { "pll3_pfd1", "pll3_usb_otg", "pll2_bus", "pll2_pfd2", };
-static const char const *gpu2d_sels[] = { "pll2_pfd2", "pll3_usb_otg", "pll3_pfd1", "pll2_bus", };
-static const char const *lcdif_pix_sels[] = { "pll2_bus", "pll3_usb_otg", "pll5_video_div", "pll2_pfd0", "pll3_pfd0", "pll3_pfd1", };
-static const char const *epdc_pix_sels[] = { "pll2_bus", "pll3_usb_otg", "pll5_video_div", "pll2_pfd0", "pll2_pfd1", "pll3_pfd1", };
-static const char const *audio_sels[] = { "pll4_post_div", "pll3_pfd2", "pll3_pfd3", "pll3_usb_otg", };
-static const char const *ecspi_sels[] = { "pll3_60m", "osc", };
-static const char const *uart_sels[] = { "pll3_80m", "osc", };
+#define CCSR 0xc
+#define BM_CCSR_PLL1_SW_CLK_SEL (1 << 2)
+#define CACRR 0x10
+#define CDHIPR 0x48
+#define BM_CDHIPR_ARM_PODF_BUSY (1 << 16)
+#define ARM_WAIT_DIV_396M 2
+#define ARM_WAIT_DIV_792M 4
+#define ARM_WAIT_DIV_996M 6
+
+#define PLL_ARM 0x0
+#define BM_PLL_ARM_DIV_SELECT (0x7f << 0)
+#define BM_PLL_ARM_POWERDOWN (1 << 12)
+#define BM_PLL_ARM_ENABLE (1 << 13)
+#define BM_PLL_ARM_LOCK (1 << 31)
+#define PLL_ARM_DIV_792M 66
+
+static const char *step_sels[] = { "osc", "pll2_pfd2", };
+static const char *pll1_sw_sels[] = { "pll1_sys", "step", };
+static const char *ocram_alt_sels[] = { "pll2_pfd2", "pll3_pfd1", };
+static const char *ocram_sels[] = { "periph", "ocram_alt_sels", };
+static const char *pre_periph_sels[] = { "pll2_bus", "pll2_pfd2", "pll2_pfd0", "pll2_198m", };
+static const char *periph_clk2_sels[] = { "pll3_usb_otg", "osc", "osc", "dummy", };
+static const char *periph2_clk2_sels[] = { "pll3_usb_otg", "pll2_bus", };
+static const char *periph_sels[] = { "pre_periph_sel", "periph_clk2_podf", };
+static const char *periph2_sels[] = { "pre_periph2_sel", "periph2_clk2_podf", };
+static const char *csi_lcdif_sels[] = { "mmdc", "pll2_pfd2", "pll3_120m", "pll3_pfd1", };
+static const char *usdhc_sels[] = { "pll2_pfd2", "pll2_pfd0", };
+static const char *ssi_sels[] = { "pll3_pfd2", "pll3_pfd3", "pll4_audio_div", "dummy", };
+static const char *perclk_sels[] = { "ipg", "osc", };
+static const char *epdc_pxp_sels[] = { "mmdc", "pll3_usb_otg", "pll5_video_div", "pll2_pfd0", "pll2_pfd2", "pll3_pfd1", };
+static const char *gpu2d_ovg_sels[] = { "pll3_pfd1", "pll3_usb_otg", "pll2_bus", "pll2_pfd2", };
+static const char *gpu2d_sels[] = { "pll2_pfd2", "pll3_usb_otg", "pll3_pfd1", "pll2_bus", };
+static const char *lcdif_pix_sels[] = { "pll2_bus", "pll3_usb_otg", "pll5_video_div", "pll2_pfd0", "pll3_pfd0", "pll3_pfd1", };
+static const char *epdc_pix_sels[] = { "pll2_bus", "pll3_usb_otg", "pll5_video_div", "pll2_pfd0", "pll2_pfd1", "pll3_pfd1", };
+static const char *audio_sels[] = { "pll4_audio_div", "pll3_pfd2", "pll3_pfd3", "pll3_usb_otg", };
+static const char *ecspi_sels[] = { "pll3_60m", "osc", };
+static const char *uart_sels[] = { "pll3_80m", "osc", };
static struct clk_div_table clk_enet_ref_table[] = {
{ .val = 0, .div = 20, },
@@ -63,15 +79,98 @@ static struct clk_div_table video_div_table[] = {
{ }
};
-static struct clk *clks[IMX6SL_CLK_CLK_END];
+static struct clk *clks[IMX6SL_CLK_END];
static struct clk_onecell_data clk_data;
+static void __iomem *ccm_base;
+static void __iomem *anatop_base;
+
+static const u32 clks_init_on[] __initconst = {
+ IMX6SL_CLK_IPG, IMX6SL_CLK_ARM, IMX6SL_CLK_MMDC_ROOT,
+};
+
+/*
+ * ERR005311 CCM: After exit from WAIT mode, unwanted interrupt(s) taken
+ * during WAIT mode entry process could cause cache memory
+ * corruption.
+ *
+ * Software workaround:
+ * To prevent this issue from occurring, software should ensure that the
+ * ARM to IPG clock ratio is less than 12:5 (that is < 2.4x), before
+ * entering WAIT mode.
+ *
+ * This function will set the ARM clk to max value within the 12:5 limit.
+ * As IPG clock is fixed at 66MHz(so ARM freq must not exceed 158.4MHz),
+ * ARM freq are one of below setpoints: 396MHz, 792MHz and 996MHz, since
+ * the clk APIs can NOT be called in idle thread(may cause kernel schedule
+ * as there is sleep function in PLL wait function), so here we just slow
+ * down ARM to below freq according to previous freq:
+ *
+ * run mode wait mode
+ * 396MHz -> 132MHz;
+ * 792MHz -> 158.4MHz;
+ * 996MHz -> 142.3MHz;
+ */
+static int imx6sl_get_arm_divider_for_wait(void)
+{
+ if (readl_relaxed(ccm_base + CCSR) & BM_CCSR_PLL1_SW_CLK_SEL) {
+ return ARM_WAIT_DIV_396M;
+ } else {
+ if ((readl_relaxed(anatop_base + PLL_ARM) &
+ BM_PLL_ARM_DIV_SELECT) == PLL_ARM_DIV_792M)
+ return ARM_WAIT_DIV_792M;
+ else
+ return ARM_WAIT_DIV_996M;
+ }
+}
+
+static void imx6sl_enable_pll_arm(bool enable)
+{
+ static u32 saved_pll_arm;
+ u32 val;
+
+ if (enable) {
+ saved_pll_arm = val = readl_relaxed(anatop_base + PLL_ARM);
+ val |= BM_PLL_ARM_ENABLE;
+ val &= ~BM_PLL_ARM_POWERDOWN;
+ writel_relaxed(val, anatop_base + PLL_ARM);
+ while (!(__raw_readl(anatop_base + PLL_ARM) & BM_PLL_ARM_LOCK))
+ ;
+ } else {
+ writel_relaxed(saved_pll_arm, anatop_base + PLL_ARM);
+ }
+}
+
+void imx6sl_set_wait_clk(bool enter)
+{
+ static unsigned long saved_arm_div;
+ int arm_div_for_wait = imx6sl_get_arm_divider_for_wait();
+
+ /*
+ * According to hardware design, arm podf change need
+ * PLL1 clock enabled.
+ */
+ if (arm_div_for_wait == ARM_WAIT_DIV_396M)
+ imx6sl_enable_pll_arm(true);
+
+ if (enter) {
+ saved_arm_div = readl_relaxed(ccm_base + CACRR);
+ writel_relaxed(arm_div_for_wait, ccm_base + CACRR);
+ } else {
+ writel_relaxed(saved_arm_div, ccm_base + CACRR);
+ }
+ while (__raw_readl(ccm_base + CDHIPR) & BM_CDHIPR_ARM_PODF_BUSY)
+ ;
+
+ if (arm_div_for_wait == ARM_WAIT_DIV_396M)
+ imx6sl_enable_pll_arm(false);
+}
static void __init imx6sl_clocks_init(struct device_node *ccm_node)
{
struct device_node *np;
void __iomem *base;
- int irq;
int i;
+ int ret;
clks[IMX6SL_CLK_DUMMY] = imx_clk_fixed("dummy", 0);
clks[IMX6SL_CLK_CKIL] = imx_obtain_fixed_clock("ckil", 0);
@@ -80,6 +179,7 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
np = of_find_compatible_node(NULL, NULL, "fsl,imx6sl-anatop");
base = of_iomap(np, 0);
WARN_ON(!base);
+ anatop_base = base;
/* type name parent base div_mask */
clks[IMX6SL_CLK_PLL1_SYS] = imx_clk_pllv3(IMX_PLLV3_SYS, "pll1_sys", "osc", base, 0x7f);
@@ -104,6 +204,7 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
/* dev name parent_name flags reg shift width div: flags, div_table lock */
clks[IMX6SL_CLK_PLL4_POST_DIV] = clk_register_divider_table(NULL, "pll4_post_div", "pll4_audio", CLK_SET_RATE_PARENT, base + 0x70, 19, 2, 0, post_div_table, &imx_ccm_lock);
+ clks[IMX6SL_CLK_PLL4_AUDIO_DIV] = clk_register_divider(NULL, "pll4_audio_div", "pll4_post_div", CLK_SET_RATE_PARENT, base + 0x170, 15, 1, 0, &imx_ccm_lock);
clks[IMX6SL_CLK_PLL5_POST_DIV] = clk_register_divider_table(NULL, "pll5_post_div", "pll5_video", CLK_SET_RATE_PARENT, base + 0xa0, 19, 2, 0, post_div_table, &imx_ccm_lock);
clks[IMX6SL_CLK_PLL5_VIDEO_DIV] = clk_register_divider_table(NULL, "pll5_video_div", "pll5_post_div", CLK_SET_RATE_PARENT, base + 0x170, 30, 2, 0, video_div_table, &imx_ccm_lock);
clks[IMX6SL_CLK_ENET_REF] = clk_register_divider_table(NULL, "enet_ref", "pll6_enet", 0, base + 0xe0, 0, 2, 0, clk_enet_ref_table, &imx_ccm_lock);
@@ -126,6 +227,10 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
np = ccm_node;
base = of_iomap(np, 0);
WARN_ON(!base);
+ ccm_base = base;
+
+ /* Reuse imx6q pm code */
+ imx6q_pm_set_ccm_base(base);
/* name reg shift width parent_names num_parents */
clks[IMX6SL_CLK_STEP] = imx_clk_mux("step", base + 0xc, 8, 1, step_sels, ARRAY_SIZE(step_sels));
@@ -207,6 +312,7 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
clks[IMX6SL_CLK_ECSPI2] = imx_clk_gate2("ecspi2", "ecspi_root", base + 0x6c, 2);
clks[IMX6SL_CLK_ECSPI3] = imx_clk_gate2("ecspi3", "ecspi_root", base + 0x6c, 4);
clks[IMX6SL_CLK_ECSPI4] = imx_clk_gate2("ecspi4", "ecspi_root", base + 0x6c, 6);
+ clks[IMX6SL_CLK_ENET] = imx_clk_gate2("enet", "ipg", base + 0x6c, 10);
clks[IMX6SL_CLK_EPIT1] = imx_clk_gate2("epit1", "perclk", base + 0x6c, 12);
clks[IMX6SL_CLK_EPIT2] = imx_clk_gate2("epit2", "perclk", base + 0x6c, 14);
clks[IMX6SL_CLK_EXTERN_AUDIO] = imx_clk_gate2("extern_audio", "extern_audio_podf", base + 0x6c, 16);
@@ -229,6 +335,7 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
clks[IMX6SL_CLK_PWM3] = imx_clk_gate2("pwm3", "perclk", base + 0x78, 20);
clks[IMX6SL_CLK_PWM4] = imx_clk_gate2("pwm4", "perclk", base + 0x78, 22);
clks[IMX6SL_CLK_SDMA] = imx_clk_gate2("sdma", "ipg", base + 0x7c, 6);
+ clks[IMX6SL_CLK_SPBA] = imx_clk_gate2("spba", "ipg", base + 0x7c, 12);
clks[IMX6SL_CLK_SPDIF] = imx_clk_gate2("spdif", "spdif0_podf", base + 0x7c, 14);
clks[IMX6SL_CLK_SSI1] = imx_clk_gate2("ssi1", "ssi1_podf", base + 0x7c, 18);
clks[IMX6SL_CLK_SSI2] = imx_clk_gate2("ssi2", "ssi2_podf", base + 0x7c, 20);
@@ -253,15 +360,31 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
clk_register_clkdev(clks[IMX6SL_CLK_GPT], "ipg", "imx-gpt.0");
clk_register_clkdev(clks[IMX6SL_CLK_GPT_SERIAL], "per", "imx-gpt.0");
+ /* Ensure the AHB clk is at 132MHz. */
+ ret = clk_set_rate(clks[IMX6SL_CLK_AHB], 132000000);
+ if (ret)
+ pr_warn("%s: failed to set AHB clock rate %d!\n",
+ __func__, ret);
+
+ /*
+ * Make sure those always on clocks are enabled to maintain the correct
+ * usecount and enabling/disabling of parent PLLs.
+ */
+ for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
+ clk_prepare_enable(clks[clks_init_on[i]]);
+
if (IS_ENABLED(CONFIG_USB_MXS_PHY)) {
clk_prepare_enable(clks[IMX6SL_CLK_USBPHY1_GATE]);
clk_prepare_enable(clks[IMX6SL_CLK_USBPHY2_GATE]);
}
+ /* Audio-related clocks configuration */
+ clk_set_parent(clks[IMX6SL_CLK_SPDIF0_SEL], clks[IMX6SL_CLK_PLL3_PFD3]);
+
+ /* Set initial power mode */
+ imx6q_set_lpm(WAIT_CLOCKED);
+
np = of_find_compatible_node(NULL, NULL, "fsl,imx6sl-gpt");
- base = of_iomap(np, 0);
- WARN_ON(!base);
- irq = irq_of_parse_and_map(np, 0);
- mxc_timer_init(base, irq);
+ mxc_timer_init_dt(np);
}
CLK_OF_DECLARE(imx6sl, "fsl,imx6sl-ccm", imx6sl_clocks_init);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 11:42:21 +0000