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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm/mach-at91/pm.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/mach-at91/pm.c')
-rw-r--r--arch/arm/mach-at91/pm.c1668
1 files changed, 1668 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
new file mode 100644
index 000000000..437dd0352
--- /dev/null
+++ b/arch/arm/mach-at91/pm.c
@@ -0,0 +1,1668 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * arch/arm/mach-at91/pm.c
+ * AT91 Power Management
+ *
+ * Copyright (C) 2005 David Brownell
+ */
+
+#include <linux/genalloc.h>
+#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>
+
+#include <linux/clk.h>
+#include <linux/clk/at91_pmc.h>
+#include <linux/platform_data/atmel.h>
+
+#include <asm/cacheflush.h>
+#include <asm/fncpy.h>
+#include <asm/system_misc.h>
+#include <asm/suspend.h>
+
+#include "generic.h"
+#include "pm.h"
+#include "sam_secure.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];
+};
+
+/**
+ * struct at91_pm_sfrbu_regs - registers mapping for SFRBU
+ * @pswbu: power switch BU control registers
+ */
+struct at91_pm_sfrbu_regs {
+ struct {
+ u32 key;
+ u32 ctrl;
+ u32 state;
+ u32 softsw;
+ } pswbu;
+};
+
+/**
+ * enum at91_pm_eth_clk - Ethernet clock indexes
+ * @AT91_PM_ETH_PCLK: pclk index
+ * @AT91_PM_ETH_HCLK: hclk index
+ * @AT91_PM_ETH_MAX_CLK: max index
+ */
+enum at91_pm_eth_clk {
+ AT91_PM_ETH_PCLK,
+ AT91_PM_ETH_HCLK,
+ AT91_PM_ETH_MAX_CLK,
+};
+
+/**
+ * enum at91_pm_eth - Ethernet controller indexes
+ * @AT91_PM_G_ETH: gigabit Ethernet controller index
+ * @AT91_PM_E_ETH: megabit Ethernet controller index
+ * @AT91_PM_MAX_ETH: max index
+ */
+enum at91_pm_eth {
+ AT91_PM_G_ETH,
+ AT91_PM_E_ETH,
+ AT91_PM_MAX_ETH,
+};
+
+/**
+ * struct at91_pm_quirk_eth - AT91 PM Ethernet quirks
+ * @dev: Ethernet device
+ * @np: Ethernet device node
+ * @clks: Ethernet clocks
+ * @modes: power management mode that this quirk applies to
+ * @dns_modes: do not suspend modes: stop suspending if Ethernet is configured
+ * as wakeup source but buggy and no other wakeup source is
+ * available
+ */
+struct at91_pm_quirk_eth {
+ struct device *dev;
+ struct device_node *np;
+ struct clk_bulk_data clks[AT91_PM_ETH_MAX_CLK];
+ u32 modes;
+ u32 dns_modes;
+};
+
+/**
+ * struct at91_pm_quirks - AT91 PM quirks
+ * @eth: Ethernet quirks
+ */
+struct at91_pm_quirks {
+ struct at91_pm_quirk_eth eth[AT91_PM_MAX_ETH];
+};
+
+/**
+ * struct at91_soc_pm - AT91 SoC power management data structure
+ * @config_shdwc_ws: wakeup sources configuration function for SHDWC
+ * @config_pmc_ws: wakeup srouces configuration function for PMC
+ * @ws_ids: wakup sources of_device_id array
+ * @bu: backup unit mapped data (for backup mode)
+ * @quirks: PM quirks
+ * @data: PM data to be used on last phase of suspend
+ * @sfrbu_regs: SFRBU registers mapping
+ * @memcs: memory chip select
+ */
+struct at91_soc_pm {
+ int (*config_shdwc_ws)(void __iomem *shdwc, u32 *mode, u32 *polarity);
+ int (*config_pmc_ws)(void __iomem *pmc, u32 mode, u32 polarity);
+ const struct of_device_id *ws_ids;
+ struct at91_pm_bu *bu;
+ struct at91_pm_quirks quirks;
+ struct at91_pm_data data;
+ struct at91_pm_sfrbu_regs sfrbu_regs;
+ void *memcs;
+};
+
+/**
+ * enum at91_pm_iomaps - IOs that needs to be mapped for different PM modes
+ * @AT91_PM_IOMAP_SHDWC: SHDWC controller
+ * @AT91_PM_IOMAP_SFRBU: SFRBU controller
+ * @AT91_PM_IOMAP_ETHC: Ethernet controller
+ */
+enum at91_pm_iomaps {
+ AT91_PM_IOMAP_SHDWC,
+ AT91_PM_IOMAP_SFRBU,
+ AT91_PM_IOMAP_ETHC,
+};
+
+#define AT91_PM_IOMAP(name) BIT(AT91_PM_IOMAP_##name)
+
+static struct at91_soc_pm soc_pm = {
+ .data = {
+ .standby_mode = AT91_PM_STANDBY,
+ .suspend_mode = AT91_PM_ULP0,
+ },
+};
+
+static const match_table_t pm_modes __initconst = {
+ { AT91_PM_STANDBY, "standby" },
+ { AT91_PM_ULP0, "ulp0" },
+ { AT91_PM_ULP0_FAST, "ulp0-fast" },
+ { AT91_PM_ULP1, "ulp1" },
+ { AT91_PM_BACKUP, "backup" },
+ { -1, NULL },
+};
+
+#define at91_ramc_read(id, field) \
+ __raw_readl(soc_pm.data.ramc[id] + field)
+
+#define at91_ramc_write(id, field, value) \
+ __raw_writel(value, soc_pm.data.ramc[id] + field)
+
+static int at91_pm_valid_state(suspend_state_t state)
+{
+ switch (state) {
+ case PM_SUSPEND_ON:
+ case PM_SUSPEND_STANDBY:
+ case PM_SUSPEND_MEM:
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+static int canary = 0xA5A5A5A5;
+
+struct wakeup_source_info {
+ unsigned int pmc_fsmr_bit;
+ unsigned int shdwc_mr_bit;
+ bool set_polarity;
+};
+
+static const struct wakeup_source_info ws_info[] = {
+ { .pmc_fsmr_bit = AT91_PMC_FSTT(10), .set_polarity = true },
+ { .pmc_fsmr_bit = AT91_PMC_RTCAL, .shdwc_mr_bit = BIT(17) },
+ { .pmc_fsmr_bit = AT91_PMC_USBAL },
+ { .pmc_fsmr_bit = AT91_PMC_SDMMC_CD },
+ { .pmc_fsmr_bit = AT91_PMC_RTTAL },
+ { .pmc_fsmr_bit = AT91_PMC_RXLP_MCE },
+};
+
+static const struct of_device_id sama5d2_ws_ids[] = {
+ { .compatible = "atmel,sama5d2-gem", .data = &ws_info[0] },
+ { .compatible = "atmel,sama5d2-rtc", .data = &ws_info[1] },
+ { .compatible = "atmel,sama5d3-udc", .data = &ws_info[2] },
+ { .compatible = "atmel,at91rm9200-ohci", .data = &ws_info[2] },
+ { .compatible = "usb-ohci", .data = &ws_info[2] },
+ { .compatible = "atmel,at91sam9g45-ehci", .data = &ws_info[2] },
+ { .compatible = "usb-ehci", .data = &ws_info[2] },
+ { .compatible = "atmel,sama5d2-sdhci", .data = &ws_info[3] },
+ { /* sentinel */ }
+};
+
+static const struct of_device_id sam9x60_ws_ids[] = {
+ { .compatible = "microchip,sam9x60-rtc", .data = &ws_info[1] },
+ { .compatible = "atmel,at91rm9200-ohci", .data = &ws_info[2] },
+ { .compatible = "usb-ohci", .data = &ws_info[2] },
+ { .compatible = "atmel,at91sam9g45-ehci", .data = &ws_info[2] },
+ { .compatible = "usb-ehci", .data = &ws_info[2] },
+ { .compatible = "microchip,sam9x60-rtt", .data = &ws_info[4] },
+ { .compatible = "cdns,sam9x60-macb", .data = &ws_info[5] },
+ { /* sentinel */ }
+};
+
+static const struct of_device_id sama7g5_ws_ids[] = {
+ { .compatible = "microchip,sama7g5-rtc", .data = &ws_info[1] },
+ { .compatible = "microchip,sama7g5-ohci", .data = &ws_info[2] },
+ { .compatible = "usb-ohci", .data = &ws_info[2] },
+ { .compatible = "atmel,at91sam9g45-ehci", .data = &ws_info[2] },
+ { .compatible = "usb-ehci", .data = &ws_info[2] },
+ { .compatible = "microchip,sama7g5-sdhci", .data = &ws_info[3] },
+ { .compatible = "microchip,sama7g5-rtt", .data = &ws_info[4] },
+ { /* sentinel */ }
+};
+
+static int at91_pm_config_ws(unsigned int pm_mode, bool set)
+{
+ const struct wakeup_source_info *wsi;
+ const struct of_device_id *match;
+ struct platform_device *pdev;
+ struct device_node *np;
+ unsigned int mode = 0, polarity = 0, val = 0;
+
+ if (pm_mode != AT91_PM_ULP1)
+ return 0;
+
+ if (!soc_pm.data.pmc || !soc_pm.data.shdwc || !soc_pm.ws_ids)
+ return -EPERM;
+
+ if (!set) {
+ writel(mode, soc_pm.data.pmc + AT91_PMC_FSMR);
+ return 0;
+ }
+
+ if (soc_pm.config_shdwc_ws)
+ soc_pm.config_shdwc_ws(soc_pm.data.shdwc, &mode, &polarity);
+
+ /* SHDWC.MR */
+ val = readl(soc_pm.data.shdwc + 0x04);
+
+ /* Loop through defined wakeup sources. */
+ for_each_matching_node_and_match(np, soc_pm.ws_ids, &match) {
+ pdev = of_find_device_by_node(np);
+ if (!pdev)
+ continue;
+
+ if (device_may_wakeup(&pdev->dev)) {
+ wsi = match->data;
+
+ /* Check if enabled on SHDWC. */
+ if (wsi->shdwc_mr_bit && !(val & wsi->shdwc_mr_bit))
+ goto put_device;
+
+ mode |= wsi->pmc_fsmr_bit;
+ if (wsi->set_polarity)
+ polarity |= wsi->pmc_fsmr_bit;
+ }
+
+put_device:
+ put_device(&pdev->dev);
+ }
+
+ if (mode) {
+ if (soc_pm.config_pmc_ws)
+ soc_pm.config_pmc_ws(soc_pm.data.pmc, mode, polarity);
+ } else {
+ pr_err("AT91: PM: no ULP1 wakeup sources found!");
+ }
+
+ return mode ? 0 : -EPERM;
+}
+
+static int at91_sama5d2_config_shdwc_ws(void __iomem *shdwc, u32 *mode,
+ u32 *polarity)
+{
+ u32 val;
+
+ /* SHDWC.WUIR */
+ val = readl(shdwc + 0x0c);
+ *mode |= (val & 0x3ff);
+ *polarity |= ((val >> 16) & 0x3ff);
+
+ return 0;
+}
+
+static int at91_sama5d2_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)
+{
+ writel(mode, pmc + AT91_PMC_FSMR);
+ writel(polarity, pmc + AT91_PMC_FSPR);
+
+ return 0;
+}
+
+static int at91_sam9x60_config_pmc_ws(void __iomem *pmc, u32 mode, u32 polarity)
+{
+ writel(mode, pmc + AT91_PMC_FSMR);
+
+ return 0;
+}
+
+static bool at91_pm_eth_quirk_is_valid(struct at91_pm_quirk_eth *eth)
+{
+ struct platform_device *pdev;
+
+ /* Interface NA in DT. */
+ if (!eth->np)
+ return false;
+
+ /* No quirks for this interface and current suspend mode. */
+ if (!(eth->modes & BIT(soc_pm.data.mode)))
+ return false;
+
+ if (!eth->dev) {
+ /* Driver not probed. */
+ pdev = of_find_device_by_node(eth->np);
+ if (!pdev)
+ return false;
+ /* put_device(eth->dev) is called at the end of suspend. */
+ eth->dev = &pdev->dev;
+ }
+
+ /* No quirks if device isn't a wakeup source. */
+ if (!device_may_wakeup(eth->dev))
+ return false;
+
+ return true;
+}
+
+static int at91_pm_config_quirks(bool suspend)
+{
+ struct at91_pm_quirk_eth *eth;
+ int i, j, ret, tmp;
+
+ /*
+ * Ethernet IPs who's device_node pointers are stored into
+ * soc_pm.quirks.eth[].np cannot handle WoL packets while in ULP0, ULP1
+ * or both due to a hardware bug. If they receive WoL packets while in
+ * ULP0 or ULP1 IPs could stop working or the whole system could stop
+ * working. We cannot handle this scenario in the ethernet driver itself
+ * as the driver is common to multiple vendors and also we only know
+ * here, in this file, if we suspend to ULP0 or ULP1 mode. Thus handle
+ * these scenarios here, as quirks.
+ */
+ for (i = 0; i < AT91_PM_MAX_ETH; i++) {
+ eth = &soc_pm.quirks.eth[i];
+
+ if (!at91_pm_eth_quirk_is_valid(eth))
+ continue;
+
+ /*
+ * For modes in dns_modes mask the system blocks if quirk is not
+ * applied but if applied the interface doesn't act at WoL
+ * events. Thus take care to avoid suspending if this interface
+ * is the only configured wakeup source.
+ */
+ if (suspend && eth->dns_modes & BIT(soc_pm.data.mode)) {
+ int ws_count = 0;
+#ifdef CONFIG_PM_SLEEP
+ struct wakeup_source *ws;
+
+ for_each_wakeup_source(ws) {
+ if (ws->dev == eth->dev)
+ continue;
+
+ ws_count++;
+ break;
+ }
+#endif
+
+ /*
+ * Checking !ws is good for all platforms with issues
+ * even when both G_ETH and E_ETH are available as dns_modes
+ * is populated only on G_ETH interface.
+ */
+ if (!ws_count) {
+ pr_err("AT91: PM: Ethernet cannot resume from WoL!");
+ ret = -EPERM;
+ put_device(eth->dev);
+ eth->dev = NULL;
+ /* No need to revert clock settings for this eth. */
+ i--;
+ goto clk_unconfigure;
+ }
+ }
+
+ if (suspend) {
+ clk_bulk_disable_unprepare(AT91_PM_ETH_MAX_CLK, eth->clks);
+ } else {
+ ret = clk_bulk_prepare_enable(AT91_PM_ETH_MAX_CLK,
+ eth->clks);
+ if (ret)
+ goto clk_unconfigure;
+ /*
+ * Release the reference to eth->dev taken in
+ * at91_pm_eth_quirk_is_valid().
+ */
+ put_device(eth->dev);
+ eth->dev = NULL;
+ }
+ }
+
+ return 0;
+
+clk_unconfigure:
+ /*
+ * In case of resume we reach this point if clk_prepare_enable() failed.
+ * we don't want to revert the previous clk_prepare_enable() for the
+ * other IP.
+ */
+ for (j = i; j >= 0; j--) {
+ eth = &soc_pm.quirks.eth[j];
+ if (suspend) {
+ if (!at91_pm_eth_quirk_is_valid(eth))
+ continue;
+
+ tmp = clk_bulk_prepare_enable(AT91_PM_ETH_MAX_CLK, eth->clks);
+ if (tmp) {
+ pr_err("AT91: PM: failed to enable %s clocks\n",
+ j == AT91_PM_G_ETH ? "geth" : "eth");
+ }
+ }
+
+ /*
+ * Release the reference to eth->dev taken in
+ * at91_pm_eth_quirk_is_valid().
+ */
+ put_device(eth->dev);
+ eth->dev = NULL;
+ }
+
+ return ret;
+}
+
+/*
+ * Called after processes are frozen, but before we shutdown devices.
+ */
+static int at91_pm_begin(suspend_state_t state)
+{
+ int ret;
+
+ switch (state) {
+ case PM_SUSPEND_MEM:
+ soc_pm.data.mode = soc_pm.data.suspend_mode;
+ break;
+
+ case PM_SUSPEND_STANDBY:
+ soc_pm.data.mode = soc_pm.data.standby_mode;
+ break;
+
+ default:
+ soc_pm.data.mode = -1;
+ }
+
+ ret = at91_pm_config_ws(soc_pm.data.mode, true);
+ if (ret)
+ return ret;
+
+ if (soc_pm.data.mode == AT91_PM_BACKUP)
+ soc_pm.bu->suspended = 1;
+ else if (soc_pm.bu)
+ soc_pm.bu->suspended = 0;
+
+ return 0;
+}
+
+/*
+ * Verify that all the clocks are correct before entering
+ * slow-clock mode.
+ */
+static int at91_pm_verify_clocks(void)
+{
+ unsigned long scsr;
+ int i;
+
+ scsr = readl(soc_pm.data.pmc + AT91_PMC_SCSR);
+
+ /* USB must not be using PLLB */
+ if ((scsr & soc_pm.data.uhp_udp_mask) != 0) {
+ pr_err("AT91: PM - Suspend-to-RAM with USB still active\n");
+ return 0;
+ }
+
+ /* PCK0..PCK3 must be disabled, or configured to use clk32k */
+ for (i = 0; i < 4; i++) {
+ u32 css;
+
+ if ((scsr & (AT91_PMC_PCK0 << i)) == 0)
+ continue;
+ css = readl(soc_pm.data.pmc + AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
+ if (css != AT91_PMC_CSS_SLOW) {
+ pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+/*
+ * Call this from platform driver suspend() to see how deeply to suspend.
+ * For example, some controllers (like OHCI) need one of the PLL clocks
+ * in order to act as a wakeup source, and those are not available when
+ * going into slow clock mode.
+ *
+ * REVISIT: generalize as clk_will_be_available(clk)? Other platforms have
+ * the very same problem (but not using at91 main_clk), and it'd be better
+ * to add one generic API rather than lots of platform-specific ones.
+ */
+int at91_suspend_entering_slow_clock(void)
+{
+ return (soc_pm.data.mode >= AT91_PM_ULP0);
+}
+EXPORT_SYMBOL(at91_suspend_entering_slow_clock);
+
+static void (*at91_suspend_sram_fn)(struct at91_pm_data *);
+extern void at91_pm_suspend_in_sram(struct at91_pm_data *pm_data);
+extern u32 at91_pm_suspend_in_sram_sz;
+
+static int at91_suspend_finish(unsigned long val)
+{
+ unsigned char modified_gray_code[] = {
+ 0x00, 0x01, 0x02, 0x03, 0x06, 0x07, 0x04, 0x05, 0x0c, 0x0d,
+ 0x0e, 0x0f, 0x0a, 0x0b, 0x08, 0x09, 0x18, 0x19, 0x1a, 0x1b,
+ 0x1e, 0x1f, 0x1c, 0x1d, 0x14, 0x15, 0x16, 0x17, 0x12, 0x13,
+ 0x10, 0x11,
+ };
+ unsigned int tmp, index;
+ int i;
+
+ if (soc_pm.data.mode == AT91_PM_BACKUP && soc_pm.data.ramc_phy) {
+ /*
+ * Bootloader will perform DDR recalibration and will try to
+ * restore the ZQ0SR0 with the value saved here. But the
+ * calibration is buggy and restoring some values from ZQ0SR0
+ * is forbidden and risky thus we need to provide processed
+ * values for these (modified gray code values).
+ */
+ tmp = readl(soc_pm.data.ramc_phy + DDR3PHY_ZQ0SR0);
+
+ /* Store pull-down output impedance select. */
+ index = (tmp >> DDR3PHY_ZQ0SR0_PDO_OFF) & 0x1f;
+ soc_pm.bu->ddr_phy_calibration[0] = modified_gray_code[index];
+
+ /* Store pull-up output impedance select. */
+ index = (tmp >> DDR3PHY_ZQ0SR0_PUO_OFF) & 0x1f;
+ soc_pm.bu->ddr_phy_calibration[0] |= modified_gray_code[index];
+
+ /* Store pull-down on-die termination impedance select. */
+ index = (tmp >> DDR3PHY_ZQ0SR0_PDODT_OFF) & 0x1f;
+ soc_pm.bu->ddr_phy_calibration[0] |= modified_gray_code[index];
+
+ /* Store pull-up on-die termination impedance select. */
+ index = (tmp >> DDR3PHY_ZQ0SRO_PUODT_OFF) & 0x1f;
+ soc_pm.bu->ddr_phy_calibration[0] |= modified_gray_code[index];
+
+ /*
+ * 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();
+
+ at91_suspend_sram_fn(&soc_pm.data);
+
+ return 0;
+}
+
+static void at91_pm_switch_ba_to_vbat(void)
+{
+ unsigned int offset = offsetof(struct at91_pm_sfrbu_regs, pswbu);
+ unsigned int val;
+
+ /* Just for safety. */
+ if (!soc_pm.data.sfrbu)
+ return;
+
+ val = readl(soc_pm.data.sfrbu + offset);
+
+ /* Already on VBAT. */
+ if (!(val & soc_pm.sfrbu_regs.pswbu.state))
+ return;
+
+ val &= ~soc_pm.sfrbu_regs.pswbu.softsw;
+ val |= soc_pm.sfrbu_regs.pswbu.key | soc_pm.sfrbu_regs.pswbu.ctrl;
+ writel(val, soc_pm.data.sfrbu + offset);
+
+ /* Wait for update. */
+ val = readl(soc_pm.data.sfrbu + offset);
+ while (val & soc_pm.sfrbu_regs.pswbu.state)
+ val = readl(soc_pm.data.sfrbu + offset);
+}
+
+static void at91_pm_suspend(suspend_state_t state)
+{
+ if (soc_pm.data.mode == AT91_PM_BACKUP) {
+ at91_pm_switch_ba_to_vbat();
+
+ cpu_suspend(0, at91_suspend_finish);
+
+ /* The SRAM is lost between suspend cycles */
+ at91_suspend_sram_fn = fncpy(at91_suspend_sram_fn,
+ &at91_pm_suspend_in_sram,
+ at91_pm_suspend_in_sram_sz);
+ } else {
+ at91_suspend_finish(0);
+ }
+
+ outer_resume();
+}
+
+/*
+ * STANDBY mode has *all* drivers suspended; ignores irqs not marked as 'wakeup'
+ * event sources; and reduces DRAM power. But otherwise it's identical to
+ * PM_SUSPEND_ON: cpu idle, and nothing fancy done with main or cpu clocks.
+ *
+ * AT91_PM_ULP0 is like STANDBY plus slow clock mode, so drivers must
+ * suspend more deeply, the master clock switches to the clk32k and turns off
+ * the main oscillator
+ *
+ * AT91_PM_BACKUP turns off the whole SoC after placing the DDR in self refresh
+ */
+static int at91_pm_enter(suspend_state_t state)
+{
+ int ret;
+
+ ret = at91_pm_config_quirks(true);
+ if (ret)
+ return ret;
+
+ switch (state) {
+ case PM_SUSPEND_MEM:
+ case PM_SUSPEND_STANDBY:
+ /*
+ * Ensure that clocks are in a valid state.
+ */
+ if (soc_pm.data.mode >= AT91_PM_ULP0 &&
+ !at91_pm_verify_clocks())
+ goto error;
+
+ at91_pm_suspend(state);
+
+ break;
+
+ case PM_SUSPEND_ON:
+ cpu_do_idle();
+ break;
+
+ default:
+ pr_debug("AT91: PM - bogus suspend state %d\n", state);
+ goto error;
+ }
+
+error:
+ at91_pm_config_quirks(false);
+ return 0;
+}
+
+/*
+ * Called right prior to thawing processes.
+ */
+static void at91_pm_end(void)
+{
+ at91_pm_config_ws(soc_pm.data.mode, false);
+}
+
+
+static const struct platform_suspend_ops at91_pm_ops = {
+ .valid = at91_pm_valid_state,
+ .begin = at91_pm_begin,
+ .enter = at91_pm_enter,
+ .end = at91_pm_end,
+};
+
+static struct platform_device at91_cpuidle_device = {
+ .name = "cpuidle-at91",
+};
+
+/*
+ * The AT91RM9200 goes into self-refresh mode with this command, and will
+ * terminate self-refresh automatically on the next SDRAM access.
+ *
+ * Self-refresh mode is exited as soon as a memory access is made, but we don't
+ * know for sure when that happens. However, we need to restore the low-power
+ * mode if it was enabled before going idle. Restoring low-power mode while
+ * still in self-refresh is "not recommended", but seems to work.
+ */
+static void at91rm9200_standby(void)
+{
+ asm volatile(
+ "b 1f\n\t"
+ ".align 5\n\t"
+ "1: mcr p15, 0, %0, c7, c10, 4\n\t"
+ " str %2, [%1, %3]\n\t"
+ " mcr p15, 0, %0, c7, c0, 4\n\t"
+ :
+ : "r" (0), "r" (soc_pm.data.ramc[0]),
+ "r" (1), "r" (AT91_MC_SDRAMC_SRR));
+}
+
+/* We manage both DDRAM/SDRAM controllers, we need more than one value to
+ * remember.
+ */
+static void at91_ddr_standby(void)
+{
+ /* Those two values allow us to delay self-refresh activation
+ * to the maximum. */
+ u32 lpr0, lpr1 = 0;
+ u32 mdr, saved_mdr0, saved_mdr1 = 0;
+ u32 saved_lpr0, saved_lpr1 = 0;
+
+ /* LPDDR1 --> force DDR2 mode during self-refresh */
+ saved_mdr0 = at91_ramc_read(0, AT91_DDRSDRC_MDR);
+ if ((saved_mdr0 & AT91_DDRSDRC_MD) == AT91_DDRSDRC_MD_LOW_POWER_DDR) {
+ mdr = saved_mdr0 & ~AT91_DDRSDRC_MD;
+ mdr |= AT91_DDRSDRC_MD_DDR2;
+ at91_ramc_write(0, AT91_DDRSDRC_MDR, mdr);
+ }
+
+ if (soc_pm.data.ramc[1]) {
+ saved_lpr1 = at91_ramc_read(1, AT91_DDRSDRC_LPR);
+ lpr1 = saved_lpr1 & ~AT91_DDRSDRC_LPCB;
+ lpr1 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
+ saved_mdr1 = at91_ramc_read(1, AT91_DDRSDRC_MDR);
+ if ((saved_mdr1 & AT91_DDRSDRC_MD) == AT91_DDRSDRC_MD_LOW_POWER_DDR) {
+ mdr = saved_mdr1 & ~AT91_DDRSDRC_MD;
+ mdr |= AT91_DDRSDRC_MD_DDR2;
+ at91_ramc_write(1, AT91_DDRSDRC_MDR, mdr);
+ }
+ }
+
+ saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
+ lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB;
+ lpr0 |= AT91_DDRSDRC_LPCB_SELF_REFRESH;
+
+ /* self-refresh mode now */
+ at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
+ if (soc_pm.data.ramc[1])
+ at91_ramc_write(1, AT91_DDRSDRC_LPR, lpr1);
+
+ cpu_do_idle();
+
+ at91_ramc_write(0, AT91_DDRSDRC_MDR, saved_mdr0);
+ at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0);
+ if (soc_pm.data.ramc[1]) {
+ at91_ramc_write(0, AT91_DDRSDRC_MDR, saved_mdr1);
+ at91_ramc_write(1, AT91_DDRSDRC_LPR, saved_lpr1);
+ }
+}
+
+static void sama5d3_ddr_standby(void)
+{
+ u32 lpr0;
+ u32 saved_lpr0;
+
+ saved_lpr0 = at91_ramc_read(0, AT91_DDRSDRC_LPR);
+ lpr0 = saved_lpr0 & ~AT91_DDRSDRC_LPCB;
+ lpr0 |= AT91_DDRSDRC_LPCB_POWER_DOWN;
+
+ at91_ramc_write(0, AT91_DDRSDRC_LPR, lpr0);
+
+ cpu_do_idle();
+
+ at91_ramc_write(0, AT91_DDRSDRC_LPR, saved_lpr0);
+}
+
+/* We manage both DDRAM/SDRAM controllers, we need more than one value to
+ * remember.
+ */
+static void at91sam9_sdram_standby(void)
+{
+ u32 lpr0, lpr1 = 0;
+ u32 saved_lpr0, saved_lpr1 = 0;
+
+ if (soc_pm.data.ramc[1]) {
+ saved_lpr1 = at91_ramc_read(1, AT91_SDRAMC_LPR);
+ lpr1 = saved_lpr1 & ~AT91_SDRAMC_LPCB;
+ lpr1 |= AT91_SDRAMC_LPCB_SELF_REFRESH;
+ }
+
+ saved_lpr0 = at91_ramc_read(0, AT91_SDRAMC_LPR);
+ lpr0 = saved_lpr0 & ~AT91_SDRAMC_LPCB;
+ lpr0 |= AT91_SDRAMC_LPCB_SELF_REFRESH;
+
+ /* self-refresh mode now */
+ at91_ramc_write(0, AT91_SDRAMC_LPR, lpr0);
+ if (soc_pm.data.ramc[1])
+ at91_ramc_write(1, AT91_SDRAMC_LPR, lpr1);
+
+ cpu_do_idle();
+
+ at91_ramc_write(0, AT91_SDRAMC_LPR, saved_lpr0);
+ if (soc_pm.data.ramc[1])
+ at91_ramc_write(1, AT91_SDRAMC_LPR, saved_lpr1);
+}
+
+static void sama7g5_standby(void)
+{
+ int pwrtmg, ratio;
+
+ pwrtmg = readl(soc_pm.data.ramc[0] + UDDRC_PWRCTL);
+ ratio = readl(soc_pm.data.pmc + AT91_PMC_RATIO);
+
+ /*
+ * Place RAM into self-refresh after a maximum idle clocks. The maximum
+ * idle clocks is configured by bootloader in
+ * UDDRC_PWRMGT.SELFREF_TO_X32.
+ */
+ writel(pwrtmg | UDDRC_PWRCTL_SELFREF_EN,
+ soc_pm.data.ramc[0] + UDDRC_PWRCTL);
+ /* Divide CPU clock by 16. */
+ writel(ratio & ~AT91_PMC_RATIO_RATIO, soc_pm.data.pmc + AT91_PMC_RATIO);
+
+ cpu_do_idle();
+
+ /* Restore previous configuration. */
+ writel(ratio, soc_pm.data.pmc + AT91_PMC_RATIO);
+ writel(pwrtmg, soc_pm.data.ramc[0] + UDDRC_PWRCTL);
+}
+
+struct ramc_info {
+ void (*idle)(void);
+ unsigned int memctrl;
+};
+
+static const struct ramc_info ramc_infos[] __initconst = {
+ { .idle = at91rm9200_standby, .memctrl = AT91_MEMCTRL_MC},
+ { .idle = at91sam9_sdram_standby, .memctrl = AT91_MEMCTRL_SDRAMC},
+ { .idle = at91_ddr_standby, .memctrl = AT91_MEMCTRL_DDRSDR},
+ { .idle = sama5d3_ddr_standby, .memctrl = AT91_MEMCTRL_DDRSDR},
+ { .idle = sama7g5_standby, },
+};
+
+static const struct of_device_id ramc_ids[] __initconst = {
+ { .compatible = "atmel,at91rm9200-sdramc", .data = &ramc_infos[0] },
+ { .compatible = "atmel,at91sam9260-sdramc", .data = &ramc_infos[1] },
+ { .compatible = "atmel,at91sam9g45-ddramc", .data = &ramc_infos[2] },
+ { .compatible = "atmel,sama5d3-ddramc", .data = &ramc_infos[3] },
+ { .compatible = "microchip,sama7g5-uddrc", .data = &ramc_infos[4], },
+ { /*sentinel*/ }
+};
+
+static const struct of_device_id ramc_phy_ids[] __initconst = {
+ { .compatible = "microchip,sama7g5-ddr3phy", },
+ { /* Sentinel. */ },
+};
+
+static __init int at91_dt_ramc(bool phy_mandatory)
+{
+ struct device_node *np;
+ const struct of_device_id *of_id;
+ int idx = 0;
+ void *standby = NULL;
+ const struct ramc_info *ramc;
+ int ret;
+
+ for_each_matching_node_and_match(np, ramc_ids, &of_id) {
+ soc_pm.data.ramc[idx] = of_iomap(np, 0);
+ if (!soc_pm.data.ramc[idx]) {
+ pr_err("unable to map ramc[%d] cpu registers\n", idx);
+ ret = -ENOMEM;
+ of_node_put(np);
+ goto unmap_ramc;
+ }
+
+ ramc = of_id->data;
+ if (ramc) {
+ if (!standby)
+ standby = ramc->idle;
+ soc_pm.data.memctrl = ramc->memctrl;
+ }
+
+ idx++;
+ }
+
+ if (!idx) {
+ pr_err("unable to find compatible ram controller node in dtb\n");
+ ret = -ENODEV;
+ goto unmap_ramc;
+ }
+
+ /* Lookup for DDR PHY node, if any. */
+ for_each_matching_node_and_match(np, ramc_phy_ids, &of_id) {
+ soc_pm.data.ramc_phy = of_iomap(np, 0);
+ if (!soc_pm.data.ramc_phy) {
+ pr_err("unable to map ramc phy cpu registers\n");
+ ret = -ENOMEM;
+ of_node_put(np);
+ goto unmap_ramc;
+ }
+ }
+
+ if (phy_mandatory && !soc_pm.data.ramc_phy) {
+ pr_err("DDR PHY is mandatory!\n");
+ ret = -ENODEV;
+ goto unmap_ramc;
+ }
+
+ if (!standby) {
+ pr_warn("ramc no standby function available\n");
+ return 0;
+ }
+
+ at91_cpuidle_device.dev.platform_data = standby;
+
+ return 0;
+
+unmap_ramc:
+ while (idx)
+ iounmap(soc_pm.data.ramc[--idx]);
+
+ return ret;
+}
+
+static void at91rm9200_idle(void)
+{
+ /*
+ * Disable the processor clock. The processor will be automatically
+ * re-enabled by an interrupt or by a reset.
+ */
+ writel(AT91_PMC_PCK, soc_pm.data.pmc + AT91_PMC_SCDR);
+}
+
+static void at91sam9_idle(void)
+{
+ writel(AT91_PMC_PCK, soc_pm.data.pmc + AT91_PMC_SCDR);
+ cpu_do_idle();
+}
+
+static void __init at91_pm_sram_init(void)
+{
+ struct gen_pool *sram_pool;
+ phys_addr_t sram_pbase;
+ unsigned long sram_base;
+ struct device_node *node;
+ struct platform_device *pdev = NULL;
+
+ for_each_compatible_node(node, NULL, "mmio-sram") {
+ pdev = of_find_device_by_node(node);
+ if (pdev) {
+ of_node_put(node);
+ break;
+ }
+ }
+
+ if (!pdev) {
+ pr_warn("%s: failed to find sram device!\n", __func__);
+ return;
+ }
+
+ sram_pool = gen_pool_get(&pdev->dev, NULL);
+ if (!sram_pool) {
+ pr_warn("%s: sram pool unavailable!\n", __func__);
+ goto out_put_device;
+ }
+
+ sram_base = gen_pool_alloc(sram_pool, at91_pm_suspend_in_sram_sz);
+ if (!sram_base) {
+ pr_warn("%s: unable to alloc sram!\n", __func__);
+ goto out_put_device;
+ }
+
+ sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base);
+ at91_suspend_sram_fn = __arm_ioremap_exec(sram_pbase,
+ at91_pm_suspend_in_sram_sz, false);
+ if (!at91_suspend_sram_fn) {
+ pr_warn("SRAM: Could not map\n");
+ goto out_put_device;
+ }
+
+ /* Copy the pm suspend handler to SRAM */
+ at91_suspend_sram_fn = fncpy(at91_suspend_sram_fn,
+ &at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
+ return;
+
+out_put_device:
+ put_device(&pdev->dev);
+ return;
+}
+
+static bool __init at91_is_pm_mode_active(int pm_mode)
+{
+ return (soc_pm.data.standby_mode == pm_mode ||
+ 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, located = 0;
+
+ if (!IS_ENABLED(CONFIG_SOC_SAMA5D2) &&
+ !IS_ENABLED(CONFIG_SOC_SAMA7G5))
+ return -EPERM;
+
+ if (!at91_is_pm_mode_active(AT91_PM_BACKUP))
+ return 0;
+
+ np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam");
+ if (!np)
+ return ret;
+
+ pdev = of_find_device_by_node(np);
+ of_node_put(np);
+ if (!pdev) {
+ pr_warn("%s: failed to find securam device!\n", __func__);
+ return ret;
+ }
+
+ sram_pool = gen_pool_get(&pdev->dev, NULL);
+ if (!sram_pool) {
+ pr_warn("%s: securam pool unavailable!\n", __func__);
+ goto securam_fail;
+ }
+
+ soc_pm.bu = (void *)gen_pool_alloc(sram_pool, sizeof(struct at91_pm_bu));
+ if (!soc_pm.bu) {
+ pr_warn("%s: unable to alloc securam!\n", __func__);
+ ret = -ENOMEM;
+ goto securam_fail;
+ }
+
+ 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;
+ }
+
+ return 0;
+
+securam_fail:
+ put_device(&pdev->dev);
+ return ret;
+}
+
+static void __init at91_pm_secure_init(void)
+{
+ int suspend_mode;
+ struct arm_smccc_res res;
+
+ suspend_mode = soc_pm.data.suspend_mode;
+
+ res = sam_smccc_call(SAMA5_SMC_SIP_SET_SUSPEND_MODE,
+ suspend_mode, 0);
+ if (res.a0 == 0) {
+ pr_info("AT91: Secure PM: suspend mode set to %s\n",
+ pm_modes[suspend_mode].pattern);
+ return;
+ }
+
+ pr_warn("AT91: Secure PM: %s mode not supported !\n",
+ pm_modes[suspend_mode].pattern);
+
+ res = sam_smccc_call(SAMA5_SMC_SIP_GET_SUSPEND_MODE, 0, 0);
+ if (res.a0 == 0) {
+ pr_warn("AT91: Secure PM: failed to get default mode\n");
+ return;
+ }
+
+ pr_info("AT91: Secure PM: using default suspend mode %s\n",
+ pm_modes[suspend_mode].pattern);
+
+ soc_pm.data.suspend_mode = res.a1;
+}
+static const struct of_device_id atmel_shdwc_ids[] = {
+ { .compatible = "atmel,sama5d2-shdwc" },
+ { .compatible = "microchip,sam9x60-shdwc" },
+ { .compatible = "microchip,sama7g5-shdwc" },
+ { /* sentinel. */ }
+};
+
+static const struct of_device_id gmac_ids[] __initconst = {
+ { .compatible = "atmel,sama5d3-gem" },
+ { .compatible = "atmel,sama5d2-gem" },
+ { .compatible = "atmel,sama5d29-gem" },
+ { .compatible = "microchip,sama7g5-gem" },
+ { },
+};
+
+static const struct of_device_id emac_ids[] __initconst = {
+ { .compatible = "atmel,sama5d3-macb" },
+ { .compatible = "microchip,sama7g5-emac" },
+ { },
+};
+
+/*
+ * Replaces _mode_to_replace with a supported mode that doesn't depend
+ * on controller pointed by _map_bitmask
+ * @_maps: u32 array containing AT91_PM_IOMAP() flags and indexed by AT91
+ * PM mode
+ * @_map_bitmask: AT91_PM_IOMAP() bitmask; if _mode_to_replace depends on
+ * controller represented by _map_bitmask, _mode_to_replace needs to be
+ * updated
+ * @_mode_to_replace: standby_mode or suspend_mode that need to be
+ * updated
+ * @_mode_to_check: standby_mode or suspend_mode; this is needed here
+ * to avoid having standby_mode and suspend_mode set with the same AT91
+ * PM mode
+ */
+#define AT91_PM_REPLACE_MODE(_maps, _map_bitmask, _mode_to_replace, \
+ _mode_to_check) \
+ do { \
+ if (((_maps)[(_mode_to_replace)]) & (_map_bitmask)) { \
+ int _mode_to_use, _mode_complementary; \
+ /* Use ULP0 if it doesn't need _map_bitmask. */ \
+ if (!((_maps)[AT91_PM_ULP0] & (_map_bitmask))) {\
+ _mode_to_use = AT91_PM_ULP0; \
+ _mode_complementary = AT91_PM_STANDBY; \
+ } else { \
+ _mode_to_use = AT91_PM_STANDBY; \
+ _mode_complementary = AT91_PM_STANDBY; \
+ } \
+ \
+ if ((_mode_to_check) != _mode_to_use) \
+ (_mode_to_replace) = _mode_to_use; \
+ else \
+ (_mode_to_replace) = _mode_complementary;\
+ } \
+ } while (0)
+
+/*
+ * Replaces standby and suspend modes with default supported modes:
+ * ULP0 and STANDBY.
+ * @_maps: u32 array indexed by AT91 PM mode containing AT91_PM_IOMAP()
+ * flags
+ * @_map: controller specific name; standby and suspend mode need to be
+ * replaced in order to not depend on this controller
+ */
+#define AT91_PM_REPLACE_MODES(_maps, _map) \
+ do { \
+ AT91_PM_REPLACE_MODE((_maps), BIT(AT91_PM_IOMAP_##_map),\
+ (soc_pm.data.standby_mode), \
+ (soc_pm.data.suspend_mode)); \
+ AT91_PM_REPLACE_MODE((_maps), BIT(AT91_PM_IOMAP_##_map),\
+ (soc_pm.data.suspend_mode), \
+ (soc_pm.data.standby_mode)); \
+ } while (0)
+
+static int __init at91_pm_get_eth_clks(struct device_node *np,
+ struct clk_bulk_data *clks)
+{
+ clks[AT91_PM_ETH_PCLK].clk = of_clk_get_by_name(np, "pclk");
+ if (IS_ERR(clks[AT91_PM_ETH_PCLK].clk))
+ return PTR_ERR(clks[AT91_PM_ETH_PCLK].clk);
+
+ clks[AT91_PM_ETH_HCLK].clk = of_clk_get_by_name(np, "hclk");
+ if (IS_ERR(clks[AT91_PM_ETH_HCLK].clk))
+ return PTR_ERR(clks[AT91_PM_ETH_HCLK].clk);
+
+ return 0;
+}
+
+static int __init at91_pm_eth_clks_empty(struct clk_bulk_data *clks)
+{
+ return IS_ERR(clks[AT91_PM_ETH_PCLK].clk) ||
+ IS_ERR(clks[AT91_PM_ETH_HCLK].clk);
+}
+
+static void __init at91_pm_modes_init(const u32 *maps, int len)
+{
+ struct at91_pm_quirk_eth *gmac = &soc_pm.quirks.eth[AT91_PM_G_ETH];
+ struct at91_pm_quirk_eth *emac = &soc_pm.quirks.eth[AT91_PM_E_ETH];
+ struct device_node *np;
+ int ret;
+
+ ret = at91_pm_backup_init();
+ if (ret) {
+ if (soc_pm.data.standby_mode == AT91_PM_BACKUP)
+ soc_pm.data.standby_mode = AT91_PM_ULP0;
+ if (soc_pm.data.suspend_mode == AT91_PM_BACKUP)
+ soc_pm.data.suspend_mode = AT91_PM_ULP0;
+ }
+
+ if (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SHDWC) ||
+ maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SHDWC)) {
+ np = of_find_matching_node(NULL, atmel_shdwc_ids);
+ if (!np) {
+ pr_warn("%s: failed to find shdwc!\n", __func__);
+ AT91_PM_REPLACE_MODES(maps, SHDWC);
+ } else {
+ soc_pm.data.shdwc = of_iomap(np, 0);
+ of_node_put(np);
+ }
+ }
+
+ if (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SFRBU) ||
+ maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SFRBU)) {
+ np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-sfrbu");
+ if (!np) {
+ pr_warn("%s: failed to find sfrbu!\n", __func__);
+ AT91_PM_REPLACE_MODES(maps, SFRBU);
+ } else {
+ soc_pm.data.sfrbu = of_iomap(np, 0);
+ of_node_put(np);
+ }
+ }
+
+ if ((at91_is_pm_mode_active(AT91_PM_ULP1) ||
+ at91_is_pm_mode_active(AT91_PM_ULP0) ||
+ at91_is_pm_mode_active(AT91_PM_ULP0_FAST)) &&
+ (maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(ETHC) ||
+ maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(ETHC))) {
+ np = of_find_matching_node(NULL, gmac_ids);
+ if (!np) {
+ np = of_find_matching_node(NULL, emac_ids);
+ if (np)
+ goto get_emac_clks;
+ AT91_PM_REPLACE_MODES(maps, ETHC);
+ goto unmap_unused_nodes;
+ } else {
+ gmac->np = np;
+ at91_pm_get_eth_clks(np, gmac->clks);
+ }
+
+ np = of_find_matching_node(NULL, emac_ids);
+ if (!np) {
+ if (at91_pm_eth_clks_empty(gmac->clks))
+ AT91_PM_REPLACE_MODES(maps, ETHC);
+ } else {
+get_emac_clks:
+ emac->np = np;
+ ret = at91_pm_get_eth_clks(np, emac->clks);
+ if (ret && at91_pm_eth_clks_empty(gmac->clks)) {
+ of_node_put(gmac->np);
+ of_node_put(emac->np);
+ gmac->np = NULL;
+ emac->np = NULL;
+ }
+ }
+ }
+
+unmap_unused_nodes:
+ /* Unmap all unnecessary. */
+ if (soc_pm.data.shdwc &&
+ !(maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SHDWC) ||
+ maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SHDWC))) {
+ iounmap(soc_pm.data.shdwc);
+ soc_pm.data.shdwc = NULL;
+ }
+
+ if (soc_pm.data.sfrbu &&
+ !(maps[soc_pm.data.standby_mode] & AT91_PM_IOMAP(SFRBU) ||
+ maps[soc_pm.data.suspend_mode] & AT91_PM_IOMAP(SFRBU))) {
+ iounmap(soc_pm.data.sfrbu);
+ soc_pm.data.sfrbu = NULL;
+ }
+
+ return;
+}
+
+struct pmc_info {
+ unsigned long uhp_udp_mask;
+ unsigned long mckr;
+ unsigned long version;
+};
+
+static const struct pmc_info pmc_infos[] __initconst = {
+ {
+ .uhp_udp_mask = AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP,
+ .mckr = 0x30,
+ .version = AT91_PMC_V1,
+ },
+
+ {
+ .uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP,
+ .mckr = 0x30,
+ .version = AT91_PMC_V1,
+ },
+ {
+ .uhp_udp_mask = AT91SAM926x_PMC_UHP,
+ .mckr = 0x30,
+ .version = AT91_PMC_V1,
+ },
+ { .uhp_udp_mask = 0,
+ .mckr = 0x30,
+ .version = AT91_PMC_V1,
+ },
+ {
+ .uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP,
+ .mckr = 0x28,
+ .version = AT91_PMC_V2,
+ },
+ {
+ .mckr = 0x28,
+ .version = AT91_PMC_V2,
+ },
+
+};
+
+static const struct of_device_id atmel_pmc_ids[] __initconst = {
+ { .compatible = "atmel,at91rm9200-pmc", .data = &pmc_infos[0] },
+ { .compatible = "atmel,at91sam9260-pmc", .data = &pmc_infos[1] },
+ { .compatible = "atmel,at91sam9261-pmc", .data = &pmc_infos[1] },
+ { .compatible = "atmel,at91sam9263-pmc", .data = &pmc_infos[1] },
+ { .compatible = "atmel,at91sam9g45-pmc", .data = &pmc_infos[2] },
+ { .compatible = "atmel,at91sam9n12-pmc", .data = &pmc_infos[1] },
+ { .compatible = "atmel,at91sam9rl-pmc", .data = &pmc_infos[3] },
+ { .compatible = "atmel,at91sam9x5-pmc", .data = &pmc_infos[1] },
+ { .compatible = "atmel,sama5d3-pmc", .data = &pmc_infos[1] },
+ { .compatible = "atmel,sama5d4-pmc", .data = &pmc_infos[1] },
+ { .compatible = "atmel,sama5d2-pmc", .data = &pmc_infos[1] },
+ { .compatible = "microchip,sam9x60-pmc", .data = &pmc_infos[4] },
+ { .compatible = "microchip,sama7g5-pmc", .data = &pmc_infos[5] },
+ { /* sentinel */ },
+};
+
+static void __init at91_pm_modes_validate(const int *modes, int len)
+{
+ u8 i, standby = 0, suspend = 0;
+ int mode;
+
+ for (i = 0; i < len; i++) {
+ if (standby && suspend)
+ break;
+
+ if (modes[i] == soc_pm.data.standby_mode && !standby) {
+ standby = 1;
+ continue;
+ }
+
+ if (modes[i] == soc_pm.data.suspend_mode && !suspend) {
+ suspend = 1;
+ continue;
+ }
+ }
+
+ if (!standby) {
+ if (soc_pm.data.suspend_mode == AT91_PM_STANDBY)
+ mode = AT91_PM_ULP0;
+ else
+ mode = AT91_PM_STANDBY;
+
+ pr_warn("AT91: PM: %s mode not supported! Using %s.\n",
+ pm_modes[soc_pm.data.standby_mode].pattern,
+ pm_modes[mode].pattern);
+ soc_pm.data.standby_mode = mode;
+ }
+
+ if (!suspend) {
+ if (soc_pm.data.standby_mode == AT91_PM_ULP0)
+ mode = AT91_PM_STANDBY;
+ else
+ mode = AT91_PM_ULP0;
+
+ pr_warn("AT91: PM: %s mode not supported! Using %s.\n",
+ pm_modes[soc_pm.data.suspend_mode].pattern,
+ pm_modes[mode].pattern);
+ soc_pm.data.suspend_mode = mode;
+ }
+}
+
+static void __init at91_pm_init(void (*pm_idle)(void))
+{
+ struct device_node *pmc_np;
+ const struct of_device_id *of_id;
+ const struct pmc_info *pmc;
+
+ if (at91_cpuidle_device.dev.platform_data)
+ platform_device_register(&at91_cpuidle_device);
+
+ pmc_np = of_find_matching_node_and_match(NULL, atmel_pmc_ids, &of_id);
+ soc_pm.data.pmc = of_iomap(pmc_np, 0);
+ of_node_put(pmc_np);
+ if (!soc_pm.data.pmc) {
+ pr_err("AT91: PM not supported, PMC not found\n");
+ return;
+ }
+
+ pmc = of_id->data;
+ soc_pm.data.uhp_udp_mask = pmc->uhp_udp_mask;
+ soc_pm.data.pmc_mckr_offset = pmc->mckr;
+ soc_pm.data.pmc_version = pmc->version;
+
+ if (pm_idle)
+ arm_pm_idle = pm_idle;
+
+ at91_pm_sram_init();
+
+ if (at91_suspend_sram_fn) {
+ suspend_set_ops(&at91_pm_ops);
+ pr_info("AT91: PM: standby: %s, suspend: %s\n",
+ pm_modes[soc_pm.data.standby_mode].pattern,
+ pm_modes[soc_pm.data.suspend_mode].pattern);
+ } else {
+ pr_info("AT91: PM not supported, due to no SRAM allocated\n");
+ }
+}
+
+void __init at91rm9200_pm_init(void)
+{
+ int ret;
+
+ if (!IS_ENABLED(CONFIG_SOC_AT91RM9200))
+ return;
+
+ /*
+ * Force STANDBY and ULP0 mode to avoid calling
+ * at91_pm_modes_validate() which may increase booting time.
+ * Platform supports anyway only STANDBY and ULP0 modes.
+ */
+ soc_pm.data.standby_mode = AT91_PM_STANDBY;
+ soc_pm.data.suspend_mode = AT91_PM_ULP0;
+
+ ret = at91_dt_ramc(false);
+ if (ret)
+ return;
+
+ /*
+ * AT91RM9200 SDRAM low-power mode cannot be used with self-refresh.
+ */
+ at91_ramc_write(0, AT91_MC_SDRAMC_LPR, 0);
+
+ at91_pm_init(at91rm9200_idle);
+}
+
+void __init sam9x60_pm_init(void)
+{
+ static const int modes[] __initconst = {
+ AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST, AT91_PM_ULP1,
+ };
+ static const int iomaps[] __initconst = {
+ [AT91_PM_ULP1] = AT91_PM_IOMAP(SHDWC),
+ };
+ int ret;
+
+ if (!IS_ENABLED(CONFIG_SOC_SAM9X60))
+ return;
+
+ at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
+ at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
+ ret = at91_dt_ramc(false);
+ if (ret)
+ return;
+
+ at91_pm_init(NULL);
+
+ soc_pm.ws_ids = sam9x60_ws_ids;
+ soc_pm.config_pmc_ws = at91_sam9x60_config_pmc_ws;
+}
+
+void __init at91sam9_pm_init(void)
+{
+ int ret;
+
+ if (!IS_ENABLED(CONFIG_SOC_AT91SAM9))
+ return;
+
+ /*
+ * Force STANDBY and ULP0 mode to avoid calling
+ * at91_pm_modes_validate() which may increase booting time.
+ * Platform supports anyway only STANDBY and ULP0 modes.
+ */
+ soc_pm.data.standby_mode = AT91_PM_STANDBY;
+ soc_pm.data.suspend_mode = AT91_PM_ULP0;
+
+ ret = at91_dt_ramc(false);
+ if (ret)
+ return;
+
+ at91_pm_init(at91sam9_idle);
+}
+
+void __init sama5_pm_init(void)
+{
+ static const int modes[] __initconst = {
+ AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST,
+ };
+ static const u32 iomaps[] __initconst = {
+ [AT91_PM_ULP0] = AT91_PM_IOMAP(ETHC),
+ [AT91_PM_ULP0_FAST] = AT91_PM_IOMAP(ETHC),
+ };
+ int ret;
+
+ if (!IS_ENABLED(CONFIG_SOC_SAMA5))
+ return;
+
+ at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
+ at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
+ ret = at91_dt_ramc(false);
+ if (ret)
+ return;
+
+ at91_pm_init(NULL);
+
+ /* Quirks applies to ULP0, ULP0 fast and ULP1 modes. */
+ soc_pm.quirks.eth[AT91_PM_G_ETH].modes = BIT(AT91_PM_ULP0) |
+ BIT(AT91_PM_ULP0_FAST) |
+ BIT(AT91_PM_ULP1);
+ /* Do not suspend in ULP0, ULP0 fast if GETH is the only wakeup source. */
+ soc_pm.quirks.eth[AT91_PM_G_ETH].dns_modes = BIT(AT91_PM_ULP0) |
+ BIT(AT91_PM_ULP0_FAST);
+}
+
+void __init sama5d2_pm_init(void)
+{
+ static const int modes[] __initconst = {
+ AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP0_FAST, AT91_PM_ULP1,
+ AT91_PM_BACKUP,
+ };
+ static const u32 iomaps[] __initconst = {
+ [AT91_PM_ULP0] = AT91_PM_IOMAP(ETHC),
+ [AT91_PM_ULP0_FAST] = AT91_PM_IOMAP(ETHC),
+ [AT91_PM_ULP1] = AT91_PM_IOMAP(SHDWC) |
+ AT91_PM_IOMAP(ETHC),
+ [AT91_PM_BACKUP] = AT91_PM_IOMAP(SHDWC) |
+ AT91_PM_IOMAP(SFRBU),
+ };
+ int ret;
+
+ if (!IS_ENABLED(CONFIG_SOC_SAMA5D2))
+ return;
+
+ if (IS_ENABLED(CONFIG_ATMEL_SECURE_PM)) {
+ pr_warn("AT91: Secure PM: ignoring standby mode\n");
+ at91_pm_secure_init();
+ return;
+ }
+
+ at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
+ at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
+ ret = at91_dt_ramc(false);
+ if (ret)
+ return;
+
+ at91_pm_init(NULL);
+
+ soc_pm.ws_ids = sama5d2_ws_ids;
+ soc_pm.config_shdwc_ws = at91_sama5d2_config_shdwc_ws;
+ soc_pm.config_pmc_ws = at91_sama5d2_config_pmc_ws;
+
+ soc_pm.sfrbu_regs.pswbu.key = (0x4BD20C << 8);
+ soc_pm.sfrbu_regs.pswbu.ctrl = BIT(0);
+ soc_pm.sfrbu_regs.pswbu.softsw = BIT(1);
+ soc_pm.sfrbu_regs.pswbu.state = BIT(3);
+
+ /* Quirk applies to ULP0, ULP0 fast and ULP1 modes. */
+ soc_pm.quirks.eth[AT91_PM_G_ETH].modes = BIT(AT91_PM_ULP0) |
+ BIT(AT91_PM_ULP0_FAST) |
+ BIT(AT91_PM_ULP1);
+ /*
+ * Do not suspend in ULP0, ULP0 fast if GETH is the only wakeup
+ * source.
+ */
+ soc_pm.quirks.eth[AT91_PM_G_ETH].dns_modes = BIT(AT91_PM_ULP0) |
+ BIT(AT91_PM_ULP0_FAST);
+}
+
+void __init sama7_pm_init(void)
+{
+ static const int modes[] __initconst = {
+ AT91_PM_STANDBY, AT91_PM_ULP0, AT91_PM_ULP1, AT91_PM_BACKUP,
+ };
+ static const u32 iomaps[] __initconst = {
+ [AT91_PM_ULP0] = AT91_PM_IOMAP(SFRBU),
+ [AT91_PM_ULP1] = AT91_PM_IOMAP(SFRBU) |
+ AT91_PM_IOMAP(SHDWC) |
+ AT91_PM_IOMAP(ETHC),
+ [AT91_PM_BACKUP] = AT91_PM_IOMAP(SFRBU) |
+ AT91_PM_IOMAP(SHDWC),
+ };
+ int ret;
+
+ if (!IS_ENABLED(CONFIG_SOC_SAMA7))
+ return;
+
+ at91_pm_modes_validate(modes, ARRAY_SIZE(modes));
+
+ ret = at91_dt_ramc(true);
+ if (ret)
+ return;
+
+ at91_pm_modes_init(iomaps, ARRAY_SIZE(iomaps));
+ at91_pm_init(NULL);
+
+ soc_pm.ws_ids = sama7g5_ws_ids;
+ soc_pm.config_pmc_ws = at91_sam9x60_config_pmc_ws;
+
+ soc_pm.sfrbu_regs.pswbu.key = (0x4BD20C << 8);
+ soc_pm.sfrbu_regs.pswbu.ctrl = BIT(0);
+ soc_pm.sfrbu_regs.pswbu.softsw = BIT(1);
+ soc_pm.sfrbu_regs.pswbu.state = BIT(2);
+
+ /* Quirks applies to ULP1 for both Ethernet interfaces. */
+ soc_pm.quirks.eth[AT91_PM_E_ETH].modes = BIT(AT91_PM_ULP1);
+ soc_pm.quirks.eth[AT91_PM_G_ETH].modes = BIT(AT91_PM_ULP1);
+}
+
+static int __init at91_pm_modes_select(char *str)
+{
+ char *s;
+ substring_t args[MAX_OPT_ARGS];
+ int standby, suspend;
+
+ if (!str)
+ return 0;
+
+ s = strsep(&str, ",");
+ standby = match_token(s, pm_modes, args);
+ if (standby < 0)
+ return 0;
+
+ suspend = match_token(str, pm_modes, args);
+ if (suspend < 0)
+ return 0;
+
+ soc_pm.data.standby_mode = standby;
+ soc_pm.data.suspend_mode = suspend;
+
+ return 0;
+}
+early_param("atmel.pm_modes", at91_pm_modes_select);