diff options
Diffstat (limited to 'target/linux/at91/patches-5.10/214-ARM-at91-pm-save-ddr-phy-calibration-data-to-securam.patch')
| -rw-r--r-- | target/linux/at91/patches-5.10/214-ARM-at91-pm-save-ddr-phy-calibration-data-to-securam.patch | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/target/linux/at91/patches-5.10/214-ARM-at91-pm-save-ddr-phy-calibration-data-to-securam.patch b/target/linux/at91/patches-5.10/214-ARM-at91-pm-save-ddr-phy-calibration-data-to-securam.patch deleted file mode 100644 index a46b5acb22..0000000000 --- a/target/linux/at91/patches-5.10/214-ARM-at91-pm-save-ddr-phy-calibration-data-to-securam.patch +++ /dev/null @@ -1,151 +0,0 @@ -From b355bb98eae3e343969fc5a0203e0dab472a6acd Mon Sep 17 00:00:00 2001 -From: Claudiu Beznea <claudiu.beznea@microchip.com> -Date: Thu, 15 Apr 2021 13:50:05 +0300 -Subject: [PATCH 214/247] ARM: at91: pm: save ddr phy calibration data to - securam - -The resuming from backup mode is done with the help of bootloader. -The bootloader reconfigure the DDR controller and DDR PHY controller. -To speed-up the resuming process save the PHY calibration data into -SECURAM before suspending (securam is powered on backup mode). -This data will be later used by bootloader in DDR PHY reconfiguration -process. Also, in the process or recalibration the first 8 words of -the memory may get corrupted. To solve this, these 8 words are saved -in the securam and restored by bootloader in the process of PHY -configuration. - -Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> -Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com> -Link: https://lore.kernel.org/r/20210415105010.569620-20-claudiu.beznea@microchip.com ---- - arch/arm/mach-at91/pm.c | 60 ++++++++++++++++++++++++++++++++++++++++- - 1 file changed, 59 insertions(+), 1 deletion(-) - ---- a/arch/arm/mach-at91/pm.c -+++ b/arch/arm/mach-at91/pm.c -@@ -10,6 +10,7 @@ - #include <linux/io.h> - #include <linux/of_address.h> - #include <linux/of.h> -+#include <linux/of_fdt.h> - #include <linux/of_platform.h> - #include <linux/parser.h> - #include <linux/suspend.h> -@@ -27,18 +28,23 @@ - #include "generic.h" - #include "pm.h" - -+#define BACKUP_DDR_PHY_CALIBRATION (9) -+ - /** - * struct at91_pm_bu - AT91 power management backup unit data structure - * @suspended: true if suspended to backup mode - * @reserved: reserved - * @canary: canary data for memory checking after exit from backup mode - * @resume: resume API -+ * @ddr_phy_calibration: DDR PHY calibration data: ZQ0CR0, first 8 words -+ * of the memory - */ - struct at91_pm_bu { - int suspended; - unsigned long reserved; - phys_addr_t canary; - phys_addr_t resume; -+ unsigned long ddr_phy_calibration[BACKUP_DDR_PHY_CALIBRATION]; - }; - - /** -@@ -48,6 +54,7 @@ struct at91_pm_bu { - * @ws_ids: wakup sources of_device_id array - * @data: PM data to be used on last phase of suspend - * @bu: backup unit mapped data (for backup mode) -+ * @memcs: memory chip select - */ - struct at91_soc_pm { - int (*config_shdwc_ws)(void __iomem *shdwc, u32 *mode, u32 *polarity); -@@ -55,6 +62,7 @@ struct at91_soc_pm { - const struct of_device_id *ws_ids; - struct at91_pm_bu *bu; - struct at91_pm_data data; -+ void *memcs; - }; - - /** -@@ -316,6 +324,19 @@ extern u32 at91_pm_suspend_in_sram_sz; - - static int at91_suspend_finish(unsigned long val) - { -+ int i; -+ -+ if (soc_pm.data.mode == AT91_PM_BACKUP && soc_pm.data.ramc_phy) { -+ /* -+ * The 1st 8 words of memory might get corrupted in the process -+ * of DDR PHY recalibration; it is saved here in securam and it -+ * will be restored later, after recalibration, by bootloader -+ */ -+ for (i = 1; i < BACKUP_DDR_PHY_CALIBRATION; i++) -+ soc_pm.bu->ddr_phy_calibration[i] = -+ *((unsigned int *)soc_pm.memcs + (i - 1)); -+ } -+ - flush_cache_all(); - outer_disable(); - -@@ -688,12 +709,40 @@ static bool __init at91_is_pm_mode_activ - soc_pm.data.suspend_mode == pm_mode); - } - -+static int __init at91_pm_backup_scan_memcs(unsigned long node, -+ const char *uname, int depth, -+ void *data) -+{ -+ const char *type; -+ const __be32 *reg; -+ int *located = data; -+ int size; -+ -+ /* Memory node already located. */ -+ if (*located) -+ return 0; -+ -+ type = of_get_flat_dt_prop(node, "device_type", NULL); -+ -+ /* We are scanning "memory" nodes only. */ -+ if (!type || strcmp(type, "memory")) -+ return 0; -+ -+ reg = of_get_flat_dt_prop(node, "reg", &size); -+ if (reg) { -+ soc_pm.memcs = __va((phys_addr_t)be32_to_cpu(*reg)); -+ *located = 1; -+ } -+ -+ return 0; -+} -+ - static int __init at91_pm_backup_init(void) - { - struct gen_pool *sram_pool; - struct device_node *np; - struct platform_device *pdev; -- int ret = -ENODEV; -+ int ret = -ENODEV, located = 0; - - if (!IS_ENABLED(CONFIG_SOC_SAMA5D2)) - return -EPERM; -@@ -728,6 +777,15 @@ static int __init at91_pm_backup_init(vo - soc_pm.bu->suspended = 0; - soc_pm.bu->canary = __pa_symbol(&canary); - soc_pm.bu->resume = __pa_symbol(cpu_resume); -+ if (soc_pm.data.ramc_phy) { -+ of_scan_flat_dt(at91_pm_backup_scan_memcs, &located); -+ if (!located) -+ goto securam_fail; -+ -+ /* DDR3PHY_ZQ0SR0 */ -+ soc_pm.bu->ddr_phy_calibration[0] = readl(soc_pm.data.ramc_phy + -+ 0x188); -+ } - - return 0; - |