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239 lines
6.8 KiB
Diff
239 lines
6.8 KiB
Diff
From 0c4cbd38a705bdeab11de4c84ad0ce8c3de8a81d Mon Sep 17 00:00:00 2001
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From: Claudiu Beznea <claudiu.beznea@microchip.com>
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Date: Thu, 15 Apr 2021 13:49:50 +0300
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Subject: [PATCH 200/247] ARM: at91: pm: check for different controllers in
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at91_pm_modes_init()
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at91_pm_modes_init() checks for proper nodes in device tree and maps
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them accordingly. Up to SAMA7G5 all AT91 SoCs had the same mapping
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b/w power saving modes and different controllers needed in the
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final/first steps of suspend/resume. SAMA7G5 is not aligned with the
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old SoCs thus the code is adapted for this. This patch prepares
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the field for next commits.
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Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
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Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
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Link: https://lore.kernel.org/r/20210415105010.569620-5-claudiu.beznea@microchip.com
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---
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arch/arm/mach-at91/pm.c | 143 +++++++++++++++++++++++++---------------
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1 file changed, 91 insertions(+), 52 deletions(-)
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--- a/arch/arm/mach-at91/pm.c
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+++ b/arch/arm/mach-at91/pm.c
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@@ -57,6 +57,18 @@ struct at91_soc_pm {
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struct at91_pm_data data;
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};
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+/**
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+ * enum at91_pm_iomaps: IOs that needs to be mapped for different PM modes
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+ * @AT91_PM_IOMAP_SHDWC: SHDWC controller
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+ * @AT91_PM_IOMAP_SFRBU: SFRBU controller
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+ */
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+enum at91_pm_iomaps {
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+ AT91_PM_IOMAP_SHDWC,
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+ AT91_PM_IOMAP_SFRBU,
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+};
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+
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+#define AT91_PM_IOMAP(name) BIT(AT91_PM_IOMAP_##name)
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+
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static struct at91_soc_pm soc_pm = {
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.data = {
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.standby_mode = AT91_PM_STANDBY,
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@@ -671,24 +683,15 @@ static int __init at91_pm_backup_init(vo
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if (!at91_is_pm_mode_active(AT91_PM_BACKUP))
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return 0;
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- np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");
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- if (!np) {
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- pr_warn("%s: failed to find sfrbu!\n", __func__);
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- return ret;
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- }
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-
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- soc_pm.data.sfrbu = of_iomap(np, 0);
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- of_node_put(np);
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-
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np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
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if (!np)
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- goto securam_fail_no_ref_dev;
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+ return ret;
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pdev = of_find_device_by_node(np);
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of_node_put(np);
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if (!pdev) {
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pr_warn("%s: failed to find securam device!\n", __func__);
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- goto securam_fail_no_ref_dev;
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+ return ret;
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}
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sram_pool = gen_pool_get(&pdev->dev, NULL);
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@@ -712,64 +715,92 @@ static int __init at91_pm_backup_init(vo
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securam_fail:
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put_device(&pdev->dev);
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-securam_fail_no_ref_dev:
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- iounmap(soc_pm.data.sfrbu);
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- soc_pm.data.sfrbu = NULL;
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return ret;
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}
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-static void __init at91_pm_use_default_mode(int pm_mode)
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-{
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- if (pm_mode != AT91_PM_ULP1 && pm_mode != AT91_PM_BACKUP)
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- return;
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-
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- if (soc_pm.data.standby_mode == pm_mode)
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- soc_pm.data.standby_mode = AT91_PM_ULP0;
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- if (soc_pm.data.suspend_mode == pm_mode)
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- soc_pm.data.suspend_mode = AT91_PM_ULP0;
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-}
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-
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static const struct of_device_id atmel_shdwc_ids[] = {
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{ .compatible = "atmel,sama5d2-shdwc" },
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{ .compatible = "microchip,sam9x60-shdwc" },
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{ /* sentinel. */ }
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};
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-static void __init at91_pm_modes_init(void)
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+static void __init at91_pm_modes_init(const u32 *maps, int len)
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{
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struct device_node *np;
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- int ret;
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+ int ret, mode;
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- if (!at91_is_pm_mode_active(AT91_PM_BACKUP) &&
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- !at91_is_pm_mode_active(AT91_PM_ULP1))
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- return;
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+ ret = at91_pm_backup_init();
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+ if (ret) {
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+ if (soc_pm.data.standby_mode == AT91_PM_BACKUP)
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+ soc_pm.data.standby_mode = AT91_PM_ULP0;
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+ if (soc_pm.data.suspend_mode == AT91_PM_BACKUP)
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+ soc_pm.data.suspend_mode = AT91_PM_ULP0;
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+ }
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+
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+ if (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SHDWC) ||
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+ maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SHDWC)) {
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+ np = of_find_matching_node(NULL, atmel_shdwc_ids);
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+ if (!np) {
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+ pr_warn("%s: failed to find shdwc!\n", __func__);
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+
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+ /* Use ULP0 if it doesn't needs SHDWC.*/
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+ if (!(maps[AT91_PM_ULP0] & AT91_PM_IOMAP(SHDWC)))
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+ mode = AT91_PM_ULP0;
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+ else
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+ mode = AT91_PM_STANDBY;
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+
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+ if (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SHDWC))
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+ soc_pm.data.standby_mode = mode;
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+ if (maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SHDWC))
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+ soc_pm.data.suspend_mode = mode;
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+ } else {
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+ soc_pm.data.shdwc = of_iomap(np, 0);
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+ of_node_put(np);
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+ }
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+ }
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- np = of_find_matching_node(NULL, atmel_shdwc_ids);
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- if (!np) {
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- pr_warn("%s: failed to find shdwc!\n", __func__);
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- goto ulp1_default;
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+ if (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SFRBU) ||
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+ maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SFRBU)) {
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+ np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");
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+ if (!np) {
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+ pr_warn("%s: failed to find sfrbu!\n", __func__);
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+
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+ /*
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+ * Use ULP0 if it doesn't need SHDWC or if SHDWC
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+ * was already located.
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+ */
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+ if (!(maps[AT91_PM_ULP0] & AT91_PM_IOMAP(SHDWC)) ||
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+ soc_pm.data.shdwc)
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+ mode = AT91_PM_ULP0;
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+ else
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+ mode = AT91_PM_STANDBY;
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+
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+ if (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SFRBU))
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+ soc_pm.data.standby_mode = mode;
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+ if (maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SFRBU))
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+ soc_pm.data.suspend_mode = mode;
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+ } else {
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+ soc_pm.data.sfrbu = of_iomap(np, 0);
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+ of_node_put(np);
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+ }
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}
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- soc_pm.data.shdwc = of_iomap(np, 0);
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- of_node_put(np);
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+ /* Unmap all unnecessary. */
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+ if (soc_pm.data.shdwc &&
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+ !(maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SHDWC) ||
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+ maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SHDWC))) {
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+ iounmap(soc_pm.data.shdwc);
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+ soc_pm.data.shdwc = NULL;
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+ }
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- ret = at91_pm_backup_init();
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- if (ret) {
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- if (!at91_is_pm_mode_active(AT91_PM_ULP1))
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- goto unmap;
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- else
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- goto backup_default;
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+ if (soc_pm.data.sfrbu &&
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+ !(maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SFRBU) ||
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+ maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SFRBU))) {
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+ iounmap(soc_pm.data.sfrbu);
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+ soc_pm.data.sfrbu = NULL;
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}
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return;
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-
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-unmap:
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- iounmap(soc_pm.data.shdwc);
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- soc_pm.data.shdwc = NULL;
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-ulp1_default:
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- at91_pm_use_default_mode(AT91_PM_ULP1);
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-backup_default:
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- at91_pm_use_default_mode(AT91_PM_BACKUP);
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}
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struct pmc_info {
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@@ -936,13 +967,16 @@ void __init sam9x60_pm_init(void)
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static const int modes[] __initconst = {
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AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST, AT91_PM_ULP1,
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};
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+ static const int iomaps[] __initconst = {
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+ [AT91_PM_ULP1] = AT91_PM_IOMAP(SHDWC),
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+ };
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int ret;
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if (!IS_ENABLED(CONFIG_SOC_SAM9X60))
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return;
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at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
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- at91_pm_modes_init();
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+ at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
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ret = at91_dt_ramc();
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if (ret)
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return;
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@@ -999,13 +1033,18 @@ void __init sama5d2_pm_init(void)
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AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST, AT91_PM_ULP1,
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AT91_PM_BACKUP,
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};
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+ static const u32 iomaps[] __initconst = {
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+ [AT91_PM_ULP1] = AT91_PM_IOMAP(SHDWC),
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+ [AT91_PM_BACKUP] = AT91_PM_IOMAP(SHDWC) |
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+ AT91_PM_IOMAP(SFRBU),
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+ };
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int ret;
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if (!IS_ENABLED(CONFIG_SOC_SAMA5D2))
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return;
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at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
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- at91_pm_modes_init();
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+ at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
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ret = at91_dt_ramc();
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if (ret)
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return;
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