b1d907f9cc
Introduce a sysdev for pxa3xx static memory controller, mainly for register saving/restoring in PM Signed-off-by: eric miao <eric.miao@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* Static Memory Controller
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/sysdev.h>
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#define SMEMC_PHYS_BASE (0x4A000000)
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#define SMEMC_PHYS_SIZE (0x90)
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#define MSC0 (0x08) /* Static Memory Controller Register 0 */
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#define MSC1 (0x0C) /* Static Memory Controller Register 1 */
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#define SXCNFG (0x1C) /* Synchronous Static Memory Control Register */
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#define MEMCLKCFG (0x68) /* Clock Configuration */
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#define CSADRCFG0 (0x80) /* Address Configuration Register for CS0 */
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#define CSADRCFG1 (0x84) /* Address Configuration Register for CS1 */
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#define CSADRCFG2 (0x88) /* Address Configuration Register for CS2 */
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#define CSADRCFG3 (0x8C) /* Address Configuration Register for CS3 */
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#ifdef CONFIG_PM
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static void __iomem *smemc_mmio_base;
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static unsigned long msc[2];
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static unsigned long sxcnfg, memclkcfg;
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static unsigned long csadrcfg[4];
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static int pxa3xx_smemc_suspend(struct sys_device *dev, pm_message_t state)
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{
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msc[0] = __raw_readl(smemc_mmio_base + MSC0);
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msc[1] = __raw_readl(smemc_mmio_base + MSC1);
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sxcnfg = __raw_readl(smemc_mmio_base + SXCNFG);
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memclkcfg = __raw_readl(smemc_mmio_base + MEMCLKCFG);
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csadrcfg[0] = __raw_readl(smemc_mmio_base + CSADRCFG0);
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csadrcfg[1] = __raw_readl(smemc_mmio_base + CSADRCFG1);
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csadrcfg[2] = __raw_readl(smemc_mmio_base + CSADRCFG2);
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csadrcfg[3] = __raw_readl(smemc_mmio_base + CSADRCFG3);
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return 0;
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}
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static int pxa3xx_smemc_resume(struct sys_device *dev)
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{
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__raw_writel(msc[0], smemc_mmio_base + MSC0);
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__raw_writel(msc[1], smemc_mmio_base + MSC1);
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__raw_writel(sxcnfg, smemc_mmio_base + SXCNFG);
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__raw_writel(memclkcfg, smemc_mmio_base + MEMCLKCFG);
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__raw_writel(csadrcfg[0], smemc_mmio_base + CSADRCFG0);
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__raw_writel(csadrcfg[1], smemc_mmio_base + CSADRCFG1);
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__raw_writel(csadrcfg[2], smemc_mmio_base + CSADRCFG2);
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__raw_writel(csadrcfg[3], smemc_mmio_base + CSADRCFG3);
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return 0;
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}
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static struct sysdev_class smemc_sysclass = {
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.name = "smemc",
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.suspend = pxa3xx_smemc_suspend,
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.resume = pxa3xx_smemc_resume,
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};
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static struct sys_device smemc_sysdev = {
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.id = 0,
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.cls = &smemc_sysclass,
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};
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static int __init smemc_init(void)
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{
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int ret = 0;
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if (cpu_is_pxa3xx()) {
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smemc_mmio_base = ioremap(SMEMC_PHYS_BASE, SMEMC_PHYS_SIZE);
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if (smemc_mmio_base == NULL)
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return -ENODEV;
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ret = sysdev_class_register(&smemc_sysclass);
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if (ret)
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return ret;
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ret = sysdev_register(&smemc_sysdev);
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}
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return ret;
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}
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subsys_initcall(smemc_init);
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#endif
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