diff options
Diffstat (limited to 'drivers/clk/at91/pmc.c')
| -rw-r--r-- | drivers/clk/at91/pmc.c | 178 |
1 files changed, 45 insertions, 133 deletions
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c index 20ee9dccee78..5aa9c1f1c886 100644 --- a/drivers/clk/at91/pmc.c +++ b/drivers/clk/at91/pmc.c @@ -3,10 +3,12 @@ * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com> */ +#include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/clkdev.h> #include <linux/clk/at91_pmc.h> #include <linux/of.h> +#include <linux/of_address.h> #include <linux/mfd/syscon.h> #include <linux/platform_device.h> #include <linux/regmap.h> @@ -14,8 +16,6 @@ #include <asm/proc-fns.h> -#include <dt-bindings/clock/at91.h> - #include "pmc.h" #define PMC_MAX_IDS 128 @@ -111,151 +111,46 @@ struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem, } #ifdef CONFIG_PM -static struct regmap *pmcreg; -static u8 registered_ids[PMC_MAX_IDS]; -static u8 registered_pcks[PMC_MAX_PCKS]; +/* Address in SECURAM that say if we suspend to backup mode. */ +static void __iomem *at91_pmc_backup_suspend; -static struct +static int at91_pmc_suspend(void) { - u32 scsr; - u32 pcsr0; - u32 uckr; - u32 mor; - u32 mcfr; - u32 pllar; - u32 mckr; - u32 usb; - u32 imr; - u32 pcsr1; - u32 pcr[PMC_MAX_IDS]; - u32 audio_pll0; - u32 audio_pll1; - u32 pckr[PMC_MAX_PCKS]; -} pmc_cache; + unsigned int backup; -/* - * As Peripheral ID 0 is invalid on AT91 chips, the identifier is stored - * without alteration in the table, and 0 is for unused clocks. - */ -void pmc_register_id(u8 id) -{ - int i; - - for (i = 0; i < PMC_MAX_IDS; i++) { - if (registered_ids[i] == 0) { - registered_ids[i] = id; - break; - } - if (registered_ids[i] == id) - break; - } -} + if (!at91_pmc_backup_suspend) + return 0; -/* - * As Programmable Clock 0 is valid on AT91 chips, there is an offset - * of 1 between the stored value and the real clock ID. - */ -void pmc_register_pck(u8 pck) -{ - int i; - - for (i = 0; i < PMC_MAX_PCKS; i++) { - if (registered_pcks[i] == 0) { - registered_pcks[i] = pck + 1; - break; - } - if (registered_pcks[i] == (pck + 1)) - break; - } -} - -static int pmc_suspend(void) -{ - int i; - u8 num; - - regmap_read(pmcreg, AT91_PMC_SCSR, &pmc_cache.scsr); - regmap_read(pmcreg, AT91_PMC_PCSR, &pmc_cache.pcsr0); - regmap_read(pmcreg, AT91_CKGR_UCKR, &pmc_cache.uckr); - regmap_read(pmcreg, AT91_CKGR_MOR, &pmc_cache.mor); - regmap_read(pmcreg, AT91_CKGR_MCFR, &pmc_cache.mcfr); - regmap_read(pmcreg, AT91_CKGR_PLLAR, &pmc_cache.pllar); - regmap_read(pmcreg, AT91_PMC_MCKR, &pmc_cache.mckr); - regmap_read(pmcreg, AT91_PMC_USB, &pmc_cache.usb); - regmap_read(pmcreg, AT91_PMC_IMR, &pmc_cache.imr); - regmap_read(pmcreg, AT91_PMC_PCSR1, &pmc_cache.pcsr1); - - for (i = 0; registered_ids[i]; i++) { - regmap_write(pmcreg, AT91_PMC_PCR, - (registered_ids[i] & AT91_PMC_PCR_PID_MASK)); - regmap_read(pmcreg, AT91_PMC_PCR, - &pmc_cache.pcr[registered_ids[i]]); - } - for (i = 0; registered_pcks[i]; i++) { - num = registered_pcks[i] - 1; - regmap_read(pmcreg, AT91_PMC_PCKR(num), &pmc_cache.pckr[num]); - } + backup = readl_relaxed(at91_pmc_backup_suspend); + if (!backup) + return 0; - return 0; + return clk_save_context(); } -static bool pmc_ready(unsigned int mask) +static void at91_pmc_resume(void) { - unsigned int status; + unsigned int backup; - regmap_read(pmcreg, AT91_PMC_SR, &status); + if (!at91_pmc_backup_suspend) + return; - return ((status & mask) == mask) ? 1 : 0; -} + backup = readl_relaxed(at91_pmc_backup_suspend); + if (!backup) + return; -static void pmc_resume(void) -{ - int i; - u8 num; - u32 tmp; - u32 mask = AT91_PMC_MCKRDY | AT91_PMC_LOCKA; - - regmap_read(pmcreg, AT91_PMC_MCKR, &tmp); - if (pmc_cache.mckr != tmp) - pr_warn("MCKR was not configured properly by the firmware\n"); - regmap_read(pmcreg, AT91_CKGR_PLLAR, &tmp); - if (pmc_cache.pllar != tmp) - pr_warn("PLLAR was not configured properly by the firmware\n"); - - regmap_write(pmcreg, AT91_PMC_SCER, pmc_cache.scsr); - regmap_write(pmcreg, AT91_PMC_PCER, pmc_cache.pcsr0); - regmap_write(pmcreg, AT91_CKGR_UCKR, pmc_cache.uckr); - regmap_write(pmcreg, AT91_CKGR_MOR, pmc_cache.mor); - regmap_write(pmcreg, AT91_CKGR_MCFR, pmc_cache.mcfr); - regmap_write(pmcreg, AT91_PMC_USB, pmc_cache.usb); - regmap_write(pmcreg, AT91_PMC_IMR, pmc_cache.imr); - regmap_write(pmcreg, AT91_PMC_PCER1, pmc_cache.pcsr1); - - for (i = 0; registered_ids[i]; i++) { - regmap_write(pmcreg, AT91_PMC_PCR, - pmc_cache.pcr[registered_ids[i]] | - AT91_PMC_PCR_CMD); - } - for (i = 0; registered_pcks[i]; i++) { - num = registered_pcks[i] - 1; - regmap_write(pmcreg, AT91_PMC_PCKR(num), pmc_cache.pckr[num]); - } - - if (pmc_cache.uckr & AT91_PMC_UPLLEN) - mask |= AT91_PMC_LOCKU; - - while (!pmc_ready(mask)) - cpu_relax(); + clk_restore_context(); } static struct syscore_ops pmc_syscore_ops = { - .suspend = pmc_suspend, - .resume = pmc_resume, + .suspend = at91_pmc_suspend, + .resume = at91_pmc_resume, }; -static const struct of_device_id sama5d2_pmc_dt_ids[] = { +static const struct of_device_id pmc_dt_ids[] = { { .compatible = "atmel,sama5d2-pmc" }, + { .compatible = "microchip,sama7g5-pmc", }, { /* sentinel */ } }; @@ -263,14 +158,31 @@ static int __init pmc_register_ops(void) { struct device_node *np; - np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids); + np = of_find_matching_node(NULL, pmc_dt_ids); + if (!np) + return -ENODEV; + + if (!of_device_is_available(np)) { + of_node_put(np); + return -ENODEV; + } + of_node_put(np); + + np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-securam"); if (!np) return -ENODEV; - pmcreg = device_node_to_regmap(np); + if (!of_device_is_available(np)) { + of_node_put(np); + return -ENODEV; + } of_node_put(np); - if (IS_ERR(pmcreg)) - return PTR_ERR(pmcreg); + + at91_pmc_backup_suspend = of_iomap(np, 0); + if (!at91_pmc_backup_suspend) { + pr_warn("%s(): unable to map securam\n", __func__); + return -ENOMEM; + } register_syscore_ops(&pmc_syscore_ops); |