Commit af818471 authored by Kristoffer Nyborg Gregertsen's avatar Kristoffer Nyborg Gregertsen Committed by Haavard Skinnemoen
Browse files

[AVR32] SMC configuration in clock cycles 



This patch makes the SMC configuration take timings in clock cycles
instead of nanoseconds. A function to calculate timings in clock
cycles is added.

This patch removes the rounding troubles of the previous SMC
configuration method.

[hskinnemoen@atmel.com: fix atstk1002/atngw100 flash config]
Signed-off-by: default avatarKristoffer Nyborg Gregertsen <gregerts@stud.ntnu.no>
Signed-off-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
parent 193fdd1a

arch/avr32/boards/atngw100/flash.c

+4 −1
Original line number Diff line number Diff line
@@ -15,7 +15,7 @@ 


#include <asm/arch/smc.h>



static struct smc_config flash_config __initdata = {

static struct smc_timing flash_timing __initdata = {

	.ncs_read_setup		= 0,

	.nrd_setup		= 40,

	.ncs_write_setup	= 0,
@@ -28,7 +28,9 @@ static struct smc_config flash_config __initdata = { 


	.read_cycle		= 120,

	.write_cycle		= 120,

};



static struct smc_config flash_config __initdata = {

	.bus_width		= 2,

	.nrd_controlled		= 1,

	.nwe_controlled		= 1,
@@ -82,6 +84,7 @@ static int __init atngw100_flash_init(void) 
{

	int ret;



	smc_set_timing(&flash_config, &flash_timing);

	ret = smc_set_configuration(0, &flash_config);

	if (ret < 0) {

		printk(KERN_ERR "atngw100: failed to set NOR flash timing\n");

arch/avr32/boards/atstk1000/flash.c

+4 −1
Original line number Diff line number Diff line
@@ -15,7 +15,7 @@ 


#include <asm/arch/smc.h>



static struct smc_config flash_config __initdata = {

static struct smc_timing flash_timing __initdata = {

	.ncs_read_setup		= 0,

	.nrd_setup		= 40,

	.ncs_write_setup	= 0,
@@ -28,7 +28,9 @@ static struct smc_config flash_config __initdata = { 


	.read_cycle		= 120,

	.write_cycle		= 120,

};



static struct smc_config flash_config __initdata = {

	.bus_width		= 2,

	.nrd_controlled		= 1,

	.nwe_controlled		= 1,
@@ -82,6 +84,7 @@ static int __init atstk1000_flash_init(void) 
{

	int ret;



	smc_set_timing(&flash_config, &flash_timing);

	ret = smc_set_configuration(0, &flash_config);

	if (ret < 0) {

		printk(KERN_ERR "atstk1000: failed to set NOR flash timing\n");

arch/avr32/mach-at32ap/hsmc.c

+112 −17
Original line number Diff line number Diff line
@@ -29,16 +29,25 @@ struct hsmc { 


static struct hsmc *hsmc;



int smc_set_configuration(int cs, const struct smc_config *config)

void smc_set_timing(struct smc_config *config,

		    const struct smc_timing *timing)

{

	int recover;

	int cycle;



	unsigned long mul;

	unsigned long offset;

	u32 setup, pulse, cycle, mode;



	if (!hsmc)

		return -ENODEV;

	if (cs >= NR_CHIP_SELECTS)

		return -EINVAL;

	/* 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
@@ -50,16 +59,102 @@ int smc_set_configuration(int cs, const struct smc_config *config) 


#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)));

	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:

include/asm-avr32/arch-at32ap/smc.h

+41 −10
Original line number Diff line number Diff line
@@ -15,22 +15,50 @@ 
/*

 * All timing parameters are in nanoseconds.

 */

struct smc_timing {

	/* Delay from address valid to assertion of given strobe */

	int ncs_read_setup;

	int nrd_setup;

	int ncs_write_setup;

	int nwe_setup;



	/* Pulse length of given strobe */

	int ncs_read_pulse;

	int nrd_pulse;

	int ncs_write_pulse;

	int nwe_pulse;



	/* Total cycle length of given operation */

	int read_cycle;

	int write_cycle;



	/* Minimal recovery times, will extend cycle if needed */

	int ncs_read_recover;

	int nrd_recover;

	int ncs_write_recover;

	int nwe_recover;

};



/*

 * All timing parameters are in clock cycles.

 */

struct smc_config {



	/* Delay from address valid to assertion of given strobe */

	u16		ncs_read_setup;

	u16		nrd_setup;

	u16		ncs_write_setup;

	u16		nwe_setup;

	u8		ncs_read_setup;

	u8		nrd_setup;

	u8		ncs_write_setup;

	u8		nwe_setup;



	/* Pulse length of given strobe */

	u16		ncs_read_pulse;

	u16		nrd_pulse;

	u16		ncs_write_pulse;

	u16		nwe_pulse;

	u8		ncs_read_pulse;

	u8		nrd_pulse;

	u8		ncs_write_pulse;

	u8		nwe_pulse;



	/* Total cycle length of given operation */

	u16		read_cycle;

	u16		write_cycle;

	u8		read_cycle;

	u8		write_cycle;



	/* Bus width in bytes */

	u8		bus_width;
@@ -76,6 +104,9 @@ struct smc_config { 
	unsigned int	tdf_mode:1;

};



extern void smc_set_timing(struct smc_config *config,

			   const struct smc_timing *timing);



extern int smc_set_configuration(int cs, const struct smc_config *config);

extern struct smc_config *smc_get_configuration(int cs);

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