diff options
Diffstat (limited to 'arch/arm/mach-at91/pm.c')
| -rw-r--r-- | arch/arm/mach-at91/pm.c | 1669 |
1 files changed, 1669 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c new file mode 100644 index 0000000000..1a26af0fab --- /dev/null +++ b/arch/arm/mach-at91/pm.c @@ -0,0 +1,1669 @@ +// 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/platform_device.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); |