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author | Sebastian Reichel <sebastian.reichel@collabora.com> | 2018-09-16 12:37:11 +0200 |
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committer | Sebastian Reichel <sebastian.reichel@collabora.com> | 2018-09-16 12:37:11 +0200 |
commit | 2e04dd441a2ecc049505b2cbfabc355a48115b59 (patch) | |
tree | 7ed3e80c9cbee2dfd1e0a5e614380242af2179da /drivers/power | |
parent | b3e1b276a429e80824f9a1384eb656af3c1daf59 (diff) | |
parent | 9f1e44774be578fb92776add95f1fcaf8284d692 (diff) | |
download | linux-stable-2e04dd441a2ecc049505b2cbfabc355a48115b59.tar.gz linux-stable-2e04dd441a2ecc049505b2cbfabc355a48115b59.tar.bz2 linux-stable-2e04dd441a2ecc049505b2cbfabc355a48115b59.zip |
Merge tag 'psy-at91-poweroff-immutable-for-v4.20-signed' into psy-next
Immutable branch for mach-at91 and power-supply for v4.20
Immutable branch between mach-at91 and power-supply for driver
changes in at91-poweroff.
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Diffstat (limited to 'drivers/power')
-rw-r--r-- | drivers/power/reset/at91-sama5d2_shdwc.c | 119 |
1 files changed, 80 insertions, 39 deletions
diff --git a/drivers/power/reset/at91-sama5d2_shdwc.c b/drivers/power/reset/at91-sama5d2_shdwc.c index 0206cce328b3..2b686c55b717 100644 --- a/drivers/power/reset/at91-sama5d2_shdwc.c +++ b/drivers/power/reset/at91-sama5d2_shdwc.c @@ -19,6 +19,7 @@ */ #include <linux/clk.h> +#include <linux/clk/at91_pmc.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> @@ -69,7 +70,10 @@ struct shdwc_config { struct shdwc { const struct shdwc_config *cfg; - void __iomem *at91_shdwc_base; + struct clk *sclk; + void __iomem *shdwc_base; + void __iomem *mpddrc_base; + void __iomem *pmc_base; }; /* @@ -77,8 +81,6 @@ struct shdwc { * since pm_power_off itself is global. */ static struct shdwc *at91_shdwc; -static struct clk *sclk; -static void __iomem *mpddrc_base; static const unsigned long long sdwc_dbc_period[] = { 0, 3, 32, 512, 4096, 32768, @@ -90,7 +92,7 @@ static void __init at91_wakeup_status(struct platform_device *pdev) u32 reg; char *reason = "unknown"; - reg = readl(shdw->at91_shdwc_base + AT91_SHDW_SR); + reg = readl(shdw->shdwc_base + AT91_SHDW_SR); dev_dbg(&pdev->dev, "%s: status = %#x\n", __func__, reg); @@ -108,12 +110,6 @@ static void __init at91_wakeup_status(struct platform_device *pdev) static void at91_poweroff(void) { - writel(AT91_SHDW_KEY | AT91_SHDW_SHDW, - at91_shdwc->at91_shdwc_base + AT91_SHDW_CR); -} - -static void at91_lpddr_poweroff(void) -{ asm volatile( /* Align to cache lines */ ".balign 32\n\t" @@ -122,16 +118,29 @@ static void at91_lpddr_poweroff(void) " ldr r6, [%2, #" __stringify(AT91_SHDW_CR) "]\n\t" /* Power down SDRAM0 */ + " tst %0, #0\n\t" + " beq 1f\n\t" " str %1, [%0, #" __stringify(AT91_DDRSDRC_LPR) "]\n\t" + + /* Switch the master clock source to slow clock. */ + "1: ldr r6, [%4, #" __stringify(AT91_PMC_MCKR) "]\n\t" + " bic r6, r6, #" __stringify(AT91_PMC_CSS) "\n\t" + " str r6, [%4, #" __stringify(AT91_PMC_MCKR) "]\n\t" + /* Wait for clock switch. */ + "2: ldr r6, [%4, #" __stringify(AT91_PMC_SR) "]\n\t" + " tst r6, #" __stringify(AT91_PMC_MCKRDY) "\n\t" + " beq 2b\n\t" + /* Shutdown CPU */ " str %3, [%2, #" __stringify(AT91_SHDW_CR) "]\n\t" " b .\n\t" : - : "r" (mpddrc_base), + : "r" (at91_shdwc->mpddrc_base), "r" cpu_to_le32(AT91_DDRSDRC_LPDDR2_PWOFF), - "r" (at91_shdwc->at91_shdwc_base), - "r" cpu_to_le32(AT91_SHDW_KEY | AT91_SHDW_SHDW) + "r" (at91_shdwc->shdwc_base), + "r" cpu_to_le32(AT91_SHDW_KEY | AT91_SHDW_SHDW), + "r" (at91_shdwc->pmc_base) : "r6"); } @@ -213,10 +222,10 @@ static void at91_shdwc_dt_configure(struct platform_device *pdev) mode |= SHDW_RTCWKEN(shdw->cfg); dev_dbg(&pdev->dev, "%s: mode = %#x\n", __func__, mode); - writel(mode, shdw->at91_shdwc_base + AT91_SHDW_MR); + writel(mode, shdw->shdwc_base + AT91_SHDW_MR); input = at91_shdwc_get_wakeup_input(pdev, np); - writel(input, shdw->at91_shdwc_base + AT91_SHDW_WUIR); + writel(input, shdw->shdwc_base + AT91_SHDW_WUIR); } static const struct shdwc_config sama5d2_shdwc_config = { @@ -246,6 +255,9 @@ static int __init at91_shdwc_probe(struct platform_device *pdev) if (!pdev->dev.of_node) return -ENODEV; + if (at91_shdwc) + return -EBUSY; + at91_shdwc = devm_kzalloc(&pdev->dev, sizeof(*at91_shdwc), GFP_KERNEL); if (!at91_shdwc) return -ENOMEM; @@ -253,20 +265,20 @@ static int __init at91_shdwc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, at91_shdwc); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - at91_shdwc->at91_shdwc_base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(at91_shdwc->at91_shdwc_base)) { + at91_shdwc->shdwc_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(at91_shdwc->shdwc_base)) { dev_err(&pdev->dev, "Could not map reset controller address\n"); - return PTR_ERR(at91_shdwc->at91_shdwc_base); + return PTR_ERR(at91_shdwc->shdwc_base); } match = of_match_node(at91_shdwc_of_match, pdev->dev.of_node); at91_shdwc->cfg = match->data; - sclk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(sclk)) - return PTR_ERR(sclk); + at91_shdwc->sclk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(at91_shdwc->sclk)) + return PTR_ERR(at91_shdwc->sclk); - ret = clk_prepare_enable(sclk); + ret = clk_prepare_enable(at91_shdwc->sclk); if (ret) { dev_err(&pdev->dev, "Could not enable slow clock\n"); return ret; @@ -276,41 +288,70 @@ static int __init at91_shdwc_probe(struct platform_device *pdev) at91_shdwc_dt_configure(pdev); - pm_power_off = at91_poweroff; + np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-pmc"); + if (!np) { + ret = -ENODEV; + goto clk_disable; + } + + at91_shdwc->pmc_base = of_iomap(np, 0); + of_node_put(np); + + if (!at91_shdwc->pmc_base) { + ret = -ENOMEM; + goto clk_disable; + } np = of_find_compatible_node(NULL, NULL, "atmel,sama5d3-ddramc"); - if (!np) - return 0; + if (!np) { + ret = -ENODEV; + goto unmap; + } - mpddrc_base = of_iomap(np, 0); + at91_shdwc->mpddrc_base = of_iomap(np, 0); of_node_put(np); - if (!mpddrc_base) - return 0; + if (!at91_shdwc->mpddrc_base) { + ret = -ENOMEM; + goto unmap; + } - ddr_type = readl(mpddrc_base + AT91_DDRSDRC_MDR) & AT91_DDRSDRC_MD; - if ((ddr_type == AT91_DDRSDRC_MD_LPDDR2) || - (ddr_type == AT91_DDRSDRC_MD_LPDDR3)) - pm_power_off = at91_lpddr_poweroff; - else - iounmap(mpddrc_base); + pm_power_off = at91_poweroff; + + ddr_type = readl(at91_shdwc->mpddrc_base + AT91_DDRSDRC_MDR) & + AT91_DDRSDRC_MD; + if (ddr_type != AT91_DDRSDRC_MD_LPDDR2 && + ddr_type != AT91_DDRSDRC_MD_LPDDR3) { + iounmap(at91_shdwc->mpddrc_base); + at91_shdwc->mpddrc_base = NULL; + } return 0; + +unmap: + iounmap(at91_shdwc->pmc_base); +clk_disable: + clk_disable_unprepare(at91_shdwc->sclk); + + return ret; } static int __exit at91_shdwc_remove(struct platform_device *pdev) { struct shdwc *shdw = platform_get_drvdata(pdev); - if (pm_power_off == at91_poweroff || - pm_power_off == at91_lpddr_poweroff) + if (pm_power_off == at91_poweroff) pm_power_off = NULL; /* Reset values to disable wake-up features */ - writel(0, shdw->at91_shdwc_base + AT91_SHDW_MR); - writel(0, shdw->at91_shdwc_base + AT91_SHDW_WUIR); + writel(0, shdw->shdwc_base + AT91_SHDW_MR); + writel(0, shdw->shdwc_base + AT91_SHDW_WUIR); + + if (shdw->mpddrc_base) + iounmap(shdw->mpddrc_base); + iounmap(shdw->pmc_base); - clk_disable_unprepare(sclk); + clk_disable_unprepare(shdw->sclk); return 0; } |