283 lines
6.3 KiB
C
283 lines
6.3 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <mach/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;
|
|
|
|
void smc_set_timing(struct smc_config *config,
|
|
const struct smc_timing *timing)
|
|
{
|
|
int recover;
|
|
int cycle;
|
|
|
|
unsigned long mul;
|
|
|
|
/* Reset all SMC timings */
|
|
config->ncs_read_setup = 0;
|
|
config->nrd_setup = 0;
|
|
config->ncs_write_setup = 0;
|
|
config->nwe_setup = 0;
|
|
config->ncs_read_pulse = 0;
|
|
config->nrd_pulse = 0;
|
|
config->ncs_write_pulse = 0;
|
|
config->nwe_pulse = 0;
|
|
config->read_cycle = 0;
|
|
config->write_cycle = 0;
|
|
|
|
/*
|
|
* 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)
|
|
|
|
if (timing->ncs_read_setup > 0)
|
|
config->ncs_read_setup = ns2cyc(timing->ncs_read_setup);
|
|
|
|
if (timing->nrd_setup > 0)
|
|
config->nrd_setup = ns2cyc(timing->nrd_setup);
|
|
|
|
if (timing->ncs_write_setup > 0)
|
|
config->ncs_write_setup = ns2cyc(timing->ncs_write_setup);
|
|
|
|
if (timing->nwe_setup > 0)
|
|
config->nwe_setup = ns2cyc(timing->nwe_setup);
|
|
|
|
if (timing->ncs_read_pulse > 0)
|
|
config->ncs_read_pulse = ns2cyc(timing->ncs_read_pulse);
|
|
|
|
if (timing->nrd_pulse > 0)
|
|
config->nrd_pulse = ns2cyc(timing->nrd_pulse);
|
|
|
|
if (timing->ncs_write_pulse > 0)
|
|
config->ncs_write_pulse = ns2cyc(timing->ncs_write_pulse);
|
|
|
|
if (timing->nwe_pulse > 0)
|
|
config->nwe_pulse = ns2cyc(timing->nwe_pulse);
|
|
|
|
if (timing->read_cycle > 0)
|
|
config->read_cycle = ns2cyc(timing->read_cycle);
|
|
|
|
if (timing->write_cycle > 0)
|
|
config->write_cycle = ns2cyc(timing->write_cycle);
|
|
|
|
/* Extend read cycle in needed */
|
|
if (timing->ncs_read_recover > 0)
|
|
recover = ns2cyc(timing->ncs_read_recover);
|
|
else
|
|
recover = 1;
|
|
|
|
cycle = config->ncs_read_setup + config->ncs_read_pulse + recover;
|
|
|
|
if (config->read_cycle < cycle)
|
|
config->read_cycle = cycle;
|
|
|
|
/* Extend read cycle in needed */
|
|
if (timing->nrd_recover > 0)
|
|
recover = ns2cyc(timing->nrd_recover);
|
|
else
|
|
recover = 1;
|
|
|
|
cycle = config->nrd_setup + config->nrd_pulse + recover;
|
|
|
|
if (config->read_cycle < cycle)
|
|
config->read_cycle = cycle;
|
|
|
|
/* Extend write cycle in needed */
|
|
if (timing->ncs_write_recover > 0)
|
|
recover = ns2cyc(timing->ncs_write_recover);
|
|
else
|
|
recover = 1;
|
|
|
|
cycle = config->ncs_write_setup + config->ncs_write_pulse + recover;
|
|
|
|
if (config->write_cycle < cycle)
|
|
config->write_cycle = cycle;
|
|
|
|
/* Extend write cycle in needed */
|
|
if (timing->nwe_recover > 0)
|
|
recover = ns2cyc(timing->nwe_recover);
|
|
else
|
|
recover = 1;
|
|
|
|
cycle = config->nwe_setup + config->nwe_pulse + recover;
|
|
|
|
if (config->write_cycle < cycle)
|
|
config->write_cycle = cycle;
|
|
}
|
|
EXPORT_SYMBOL(smc_set_timing);
|
|
|
|
int smc_set_configuration(int cs, const struct smc_config *config)
|
|
{
|
|
unsigned long offset;
|
|
u32 setup, pulse, cycle, mode;
|
|
|
|
if (!hsmc)
|
|
return -ENODEV;
|
|
if (cs >= NR_CHIP_SELECTS)
|
|
return -EINVAL;
|
|
|
|
setup = (HSMC_BF(NWE_SETUP, config->nwe_setup)
|
|
| HSMC_BF(NCS_WR_SETUP, config->ncs_write_setup)
|
|
| HSMC_BF(NRD_SETUP, config->nrd_setup)
|
|
| HSMC_BF(NCS_RD_SETUP, config->ncs_read_setup));
|
|
pulse = (HSMC_BF(NWE_PULSE, config->nwe_pulse)
|
|
| HSMC_BF(NCS_WR_PULSE, config->ncs_write_pulse)
|
|
| HSMC_BF(NRD_PULSE, config->nrd_pulse)
|
|
| HSMC_BF(NCS_RD_PULSE, config->ncs_read_pulse));
|
|
cycle = (HSMC_BF(NWE_CYCLE, config->write_cycle)
|
|
| HSMC_BF(NRD_CYCLE, 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;
|
|
}
|
|
|
|
switch (config->nwait_mode) {
|
|
case 0:
|
|
mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_DISABLED);
|
|
break;
|
|
case 1:
|
|
mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_RESERVED);
|
|
break;
|
|
case 2:
|
|
mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_FROZEN);
|
|
break;
|
|
case 3:
|
|
mode |= HSMC_BF(EXNW_MODE, HSMC_EXNW_MODE_READY);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (config->tdf_cycles) {
|
|
mode |= HSMC_BF(TDF_CYCLES, config->tdf_cycles);
|
|
}
|
|
|
|
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);
|
|
if (config->tdf_mode)
|
|
mode |= HSMC_BIT(TDF_MODE);
|
|
|
|
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, resource_size(regs));
|
|
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);
|
|
}
|
|
core_initcall(hsmc_init);
|