+++ /dev/null
-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;
-
projects / openwrt / openwrt.git / blobdiff