This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / avr32 / mach-at32ap / hsmc.c

diff --git a/arch/avr32/mach-at32ap/hsmc.c b/arch/avr32/mach-at32ap/hsmc.c
new file mode 100644 (file)
index 0000000..7691721
--- /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);