1 files changed, 164 insertions, 0 deletions

diff --git a/arch/avr32/mach-at32ap/hsmc.c b/arch/avr32/mach-at32ap/hsmc.c
new file mode 100644
index 000000000000..7691721928a7
--- /dev/null
+++ b/arch/avr32/mach-at32ap/hsmc.c
@@ -0,0 +1,164 @@
+/*
+ * Static Memory Controller for AT32 chips
+ *
+ * Copyright (C) 2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define DEBUG
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/arch/smc.h>
+
+#include "hsmc.h"
+
+#define NR_CHIP_SELECTS 6
+
+struct hsmc {
+	void __iomem *regs;
+	struct clk *pclk;
+	struct clk *mck;
+};
+
+static struct hsmc *hsmc;
+
+int smc_set_configuration(int cs, const struct smc_config *config)
+{
+	unsigned long mul;
+	unsigned long offset;
+	u32 setup, pulse, cycle, mode;
+
+	if (!hsmc)
+		return -ENODEV;
+	if (cs >= NR_CHIP_SELECTS)
+		return -EINVAL;
+
+	/*
+	 * cycles = x / T = x * f
+	 *   = ((x * 1000000000) * ((f * 65536) / 1000000000)) / 65536
+	 *   = ((x * 1000000000) * (((f / 10000) * 65536) / 100000)) / 65536
+	 */
+	mul = (clk_get_rate(hsmc->mck) / 10000) << 16;
+	mul /= 100000;
+
+#define ns2cyc(x) ((((x) * mul) + 65535) >> 16)
+
+	setup = (HSMC_BF(NWE_SETUP, ns2cyc(config->nwe_setup))
+		 | HSMC_BF(NCS_WR_SETUP, ns2cyc(config->ncs_write_setup))
+		 | HSMC_BF(NRD_SETUP, ns2cyc(config->nrd_setup))
+		 | HSMC_BF(NCS_RD_SETUP, ns2cyc(config->ncs_read_setup)));
+	pulse = (HSMC_BF(NWE_PULSE, ns2cyc(config->nwe_pulse))
+		 | HSMC_BF(NCS_WR_PULSE, ns2cyc(config->ncs_write_pulse))
+		 | HSMC_BF(NRD_PULSE, ns2cyc(config->nrd_pulse))
+		 | HSMC_BF(NCS_RD_PULSE, ns2cyc(config->ncs_read_pulse)));
+	cycle = (HSMC_BF(NWE_CYCLE, ns2cyc(config->write_cycle))
+		 | HSMC_BF(NRD_CYCLE, ns2cyc(config->read_cycle)));
+
+	switch (config->bus_width) {
+	case 1:
+		mode = HSMC_BF(DBW, HSMC_DBW_8_BITS);
+		break;
+	case 2:
+		mode = HSMC_BF(DBW, HSMC_DBW_16_BITS);
+		break;
+	case 4:
+		mode = HSMC_BF(DBW, HSMC_DBW_32_BITS);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (config->nrd_controlled)
+		mode |= HSMC_BIT(READ_MODE);
+	if (config->nwe_controlled)
+		mode |= HSMC_BIT(WRITE_MODE);
+	if (config->byte_write)
+		mode |= HSMC_BIT(BAT);
+
+	pr_debug("smc cs%d: setup/%08x pulse/%08x cycle/%08x mode/%08x\n",
+		 cs, setup, pulse, cycle, mode);
+
+	offset = cs * 0x10;
+	hsmc_writel(hsmc, SETUP0 + offset, setup);
+	hsmc_writel(hsmc, PULSE0 + offset, pulse);
+	hsmc_writel(hsmc, CYCLE0 + offset, cycle);
+	hsmc_writel(hsmc, MODE0 + offset, mode);
+	hsmc_readl(hsmc, MODE0); /* I/O barrier */
+
+	return 0;
+}
+EXPORT_SYMBOL(smc_set_configuration);
+
+static int hsmc_probe(struct platform_device *pdev)
+{
+	struct resource *regs;
+	struct clk *pclk, *mck;
+	int ret;
+
+	if (hsmc)
+		return -EBUSY;
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!regs)
+		return -ENXIO;
+	pclk = clk_get(&pdev->dev, "pclk");
+	if (IS_ERR(pclk))
+		return PTR_ERR(pclk);
+	mck = clk_get(&pdev->dev, "mck");
+	if (IS_ERR(mck)) {
+		ret = PTR_ERR(mck);
+		goto out_put_pclk;
+	}
+
+	ret = -ENOMEM;
+	hsmc = kzalloc(sizeof(struct hsmc), GFP_KERNEL);
+	if (!hsmc)
+		goto out_put_clocks;
+
+	clk_enable(pclk);
+	clk_enable(mck);
+
+	hsmc->pclk = pclk;
+	hsmc->mck = mck;
+	hsmc->regs = ioremap(regs->start, regs->end - regs->start + 1);
+	if (!hsmc->regs)
+		goto out_disable_clocks;
+
+	dev_info(&pdev->dev, "Atmel Static Memory Controller at 0x%08lx\n",
+		 (unsigned long)regs->start);
+
+	platform_set_drvdata(pdev, hsmc);
+
+	return 0;
+
+out_disable_clocks:
+	clk_disable(mck);
+	clk_disable(pclk);
+	kfree(hsmc);
+out_put_clocks:
+	clk_put(mck);
+out_put_pclk:
+	clk_put(pclk);
+	hsmc = NULL;
+	return ret;
+}
+
+static struct platform_driver hsmc_driver = {
+	.probe		= hsmc_probe,
+	.driver		= {
+		.name	= "smc",
+	},
+};
+
+static int __init hsmc_init(void)
+{
+	return platform_driver_register(&hsmc_driver);
+}
+arch_initcall(hsmc_init);