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linux/arch/arm/mach-omap2/usb-tusb6010.c
Jarkko Nikula eaf9393bb7 ARM: OMAP2: Fix tusb6010 init error and compilation warning 
Fix "tusb6010 init error 5, -19" and compilation warning from function
tusb6010_platform_retime "warning: 'sysclk_ps' is used uninitialized in this
function".

I suppose commit c094ba34b8f780885d029ce3c2715a194b780e5d was meant to test
for zero fclk_ps instead of sysclk_ps.

Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Cc: Roel Kluin <roel.kluin@gmail.com>
Tested-by: Kalle Valo <kalle.valo@iki.fi>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2009-05-12 11:20:02 -07:00

349 lines
8.6 KiB
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/*
* linux/arch/arm/mach-omap2/usb-tusb6010.c
*
* Copyright (C) 2006 Nokia 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/types.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/usb/musb.h>
#include <mach/gpmc.h>
#include <mach/mux.h>
static u8 async_cs, sync_cs;
static unsigned refclk_psec;
/* t2_ps, when quantized to fclk units, must happen no earlier than
* the clock after after t1_NS.
*
* Return a possibly updated value of t2_ps, converted to nsec.
*/
static unsigned
next_clk(unsigned t1_NS, unsigned t2_ps, unsigned fclk_ps)
{
unsigned t1_ps = t1_NS * 1000;
unsigned t1_f, t2_f;
if ((t1_ps + fclk_ps) < t2_ps)
return t2_ps / 1000;
t1_f = (t1_ps + fclk_ps - 1) / fclk_ps;
t2_f = (t2_ps + fclk_ps - 1) / fclk_ps;
if (t1_f >= t2_f)
t2_f = t1_f + 1;
return (t2_f * fclk_ps) / 1000;
}
/* NOTE: timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */
static int tusb_set_async_mode(unsigned sysclk_ps, unsigned fclk_ps)
{
struct gpmc_timings t;
unsigned t_acsnh_advnh = sysclk_ps + 3000;
unsigned tmp;
memset(&t, 0, sizeof(t));
/* CS_ON = t_acsnh_acsnl */
t.cs_on = 8;
/* ADV_ON = t_acsnh_advnh - t_advn */
t.adv_on = next_clk(t.cs_on, t_acsnh_advnh - 7000, fclk_ps);
/*
* READ ... from omap2420 TRM fig 12-13
*/
/* ADV_RD_OFF = t_acsnh_advnh */
t.adv_rd_off = next_clk(t.adv_on, t_acsnh_advnh, fclk_ps);
/* OE_ON = t_acsnh_advnh + t_advn_oen (then wait for nRDY) */
t.oe_on = next_clk(t.adv_on, t_acsnh_advnh + 1000, fclk_ps);
/* ACCESS = counters continue only after nRDY */
tmp = t.oe_on * 1000 + 300;
t.access = next_clk(t.oe_on, tmp, fclk_ps);
/* OE_OFF = after data gets sampled */
tmp = t.access * 1000;
t.oe_off = next_clk(t.access, tmp, fclk_ps);
t.cs_rd_off = t.oe_off;
tmp = t.cs_rd_off * 1000 + 7000 /* t_acsn_rdy_z */;
t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);
/*
* WRITE ... from omap2420 TRM fig 12-15
*/
/* ADV_WR_OFF = t_acsnh_advnh */
t.adv_wr_off = t.adv_rd_off;
/* WE_ON = t_acsnh_advnh + t_advn_wen (then wait for nRDY) */
t.we_on = next_clk(t.adv_wr_off, t_acsnh_advnh + 1000, fclk_ps);
/* WE_OFF = after data gets sampled */
tmp = t.we_on * 1000 + 300;
t.we_off = next_clk(t.we_on, tmp, fclk_ps);
t.cs_wr_off = t.we_off;
tmp = t.cs_wr_off * 1000 + 7000 /* t_acsn_rdy_z */;
t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);
return gpmc_cs_set_timings(async_cs, &t);
}
static int tusb_set_sync_mode(unsigned sysclk_ps, unsigned fclk_ps)
{
struct gpmc_timings t;
unsigned t_scsnh_advnh = sysclk_ps + 3000;
unsigned tmp;
memset(&t, 0, sizeof(t));
t.cs_on = 8;
/* ADV_ON = t_acsnh_advnh - t_advn */
t.adv_on = next_clk(t.cs_on, t_scsnh_advnh - 7000, fclk_ps);
/* GPMC_CLK rate = fclk rate / div */
t.sync_clk = 12 /* 11.1 nsec */;
tmp = (t.sync_clk * 1000 + fclk_ps - 1) / fclk_ps;
if (tmp > 4)
return -ERANGE;
if (tmp <= 0)
tmp = 1;
t.page_burst_access = (fclk_ps * tmp) / 1000;
/*
* READ ... based on omap2420 TRM fig 12-19, 12-20
*/
/* ADV_RD_OFF = t_scsnh_advnh */
t.adv_rd_off = next_clk(t.adv_on, t_scsnh_advnh, fclk_ps);
/* OE_ON = t_scsnh_advnh + t_advn_oen * fclk_ps (then wait for nRDY) */
tmp = (t.adv_rd_off * 1000) + (3 * fclk_ps);
t.oe_on = next_clk(t.adv_on, tmp, fclk_ps);
/* ACCESS = number of clock cycles after t_adv_eon */
tmp = (t.oe_on * 1000) + (5 * fclk_ps);
t.access = next_clk(t.oe_on, tmp, fclk_ps);
/* OE_OFF = after data gets sampled */
tmp = (t.access * 1000) + (1 * fclk_ps);
t.oe_off = next_clk(t.access, tmp, fclk_ps);
t.cs_rd_off = t.oe_off;
tmp = t.cs_rd_off * 1000 + 7000 /* t_scsn_rdy_z */;
t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);
/*
* WRITE ... based on omap2420 TRM fig 12-21
*/
/* ADV_WR_OFF = t_scsnh_advnh */
t.adv_wr_off = t.adv_rd_off;
/* WE_ON = t_scsnh_advnh + t_advn_wen * fclk_ps (then wait for nRDY) */
tmp = (t.adv_wr_off * 1000) + (3 * fclk_ps);
t.we_on = next_clk(t.adv_wr_off, tmp, fclk_ps);
/* WE_OFF = number of clock cycles after t_adv_wen */
tmp = (t.we_on * 1000) + (6 * fclk_ps);
t.we_off = next_clk(t.we_on, tmp, fclk_ps);
t.cs_wr_off = t.we_off;
tmp = t.cs_wr_off * 1000 + 7000 /* t_scsn_rdy_z */;
t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);
return gpmc_cs_set_timings(sync_cs, &t);
}
extern unsigned long gpmc_get_fclk_period(void);
/* tusb driver calls this when it changes the chip's clocking */
int tusb6010_platform_retime(unsigned is_refclk)
{
static const char error[] =
KERN_ERR "tusb6010 %s retime error %d\n";
unsigned fclk_ps = gpmc_get_fclk_period();
unsigned sysclk_ps;
int status;
if (!refclk_psec || fclk_ps == 0)
return -ENODEV;
sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;
status = tusb_set_async_mode(sysclk_ps, fclk_ps);
if (status < 0) {
printk(error, "async", status);
goto done;
}
status = tusb_set_sync_mode(sysclk_ps, fclk_ps);
if (status < 0)
printk(error, "sync", status);
done:
return status;
}
EXPORT_SYMBOL_GPL(tusb6010_platform_retime);
static struct resource tusb_resources[] = {
/* Order is significant! The start/end fields
* are updated during setup..
*/
{ /* Asynchronous access */
.flags = IORESOURCE_MEM,
},
{ /* Synchronous access */
.flags = IORESOURCE_MEM,
},
{ /* IRQ */
.flags = IORESOURCE_IRQ,
},
};
static u64 tusb_dmamask = ~(u32)0;
static struct platform_device tusb_device = {
.name = "musb_hdrc",
.id = -1,
.dev = {
.dma_mask = &tusb_dmamask,
.coherent_dma_mask = 0xffffffff,
},
.num_resources = ARRAY_SIZE(tusb_resources),
.resource = tusb_resources,
};
/* this may be called only from board-*.c setup code */
int __init
tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
unsigned ps_refclk, unsigned waitpin,
unsigned async, unsigned sync,
unsigned irq, unsigned dmachan)
{
int status;
static char error[] __initdata =
KERN_ERR "tusb6010 init error %d, %d\n";
/* ASYNC region, primarily for PIO */
status = gpmc_cs_request(async, SZ_16M, (unsigned long *)
&tusb_resources[0].start);
if (status < 0) {
printk(error, 1, status);
return status;
}
tusb_resources[0].end = tusb_resources[0].start + 0x9ff;
async_cs = async;
gpmc_cs_write_reg(async, GPMC_CS_CONFIG1,
GPMC_CONFIG1_PAGE_LEN(2)
| GPMC_CONFIG1_WAIT_READ_MON
| GPMC_CONFIG1_WAIT_WRITE_MON
| GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
| GPMC_CONFIG1_READTYPE_ASYNC
| GPMC_CONFIG1_WRITETYPE_ASYNC
| GPMC_CONFIG1_DEVICESIZE_16
| GPMC_CONFIG1_DEVICETYPE_NOR
| GPMC_CONFIG1_MUXADDDATA);
/* SYNC region, primarily for DMA */
status = gpmc_cs_request(sync, SZ_16M, (unsigned long *)
&tusb_resources[1].start);
if (status < 0) {
printk(error, 2, status);
return status;
}
tusb_resources[1].end = tusb_resources[1].start + 0x9ff;
sync_cs = sync;
gpmc_cs_write_reg(sync, GPMC_CS_CONFIG1,
GPMC_CONFIG1_READMULTIPLE_SUPP
| GPMC_CONFIG1_READTYPE_SYNC
| GPMC_CONFIG1_WRITEMULTIPLE_SUPP
| GPMC_CONFIG1_WRITETYPE_SYNC
| GPMC_CONFIG1_CLKACTIVATIONTIME(1)
| GPMC_CONFIG1_PAGE_LEN(2)
| GPMC_CONFIG1_WAIT_READ_MON
| GPMC_CONFIG1_WAIT_WRITE_MON
| GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
| GPMC_CONFIG1_DEVICESIZE_16
| GPMC_CONFIG1_DEVICETYPE_NOR
| GPMC_CONFIG1_MUXADDDATA
/* fclk divider gets set later */
);
/* IRQ */
status = gpio_request(irq, "TUSB6010 irq");
if (status < 0) {
printk(error, 3, status);
return status;
}
gpio_direction_input(irq);
tusb_resources[2].start = irq + IH_GPIO_BASE;
/* set up memory timings ... can speed them up later */
if (!ps_refclk) {
printk(error, 4, status);
return -ENODEV;
}
refclk_psec = ps_refclk;
status = tusb6010_platform_retime(1);
if (status < 0) {
printk(error, 5, status);
return status;
}
/* finish device setup ... */
if (!data) {
printk(error, 6, status);
return -ENODEV;
}
tusb_device.dev.platform_data = data;
/* REVISIT let the driver know what DMA channels work */
if (!dmachan)
tusb_device.dev.dma_mask = NULL;
else {
/* assume OMAP 2420 ES2.0 and later */
if (dmachan & (1 << 0))
omap_cfg_reg(AA10_242X_DMAREQ0);
if (dmachan & (1 << 1))
omap_cfg_reg(AA6_242X_DMAREQ1);
if (dmachan & (1 << 2))
omap_cfg_reg(E4_242X_DMAREQ2);
if (dmachan & (1 << 3))
omap_cfg_reg(G4_242X_DMAREQ3);
if (dmachan & (1 << 4))
omap_cfg_reg(D3_242X_DMAREQ4);
if (dmachan & (1 << 5))
omap_cfg_reg(E3_242X_DMAREQ5);
}
/* so far so good ... register the device */
status = platform_device_register(&tusb_device);
if (status < 0) {
printk(error, 7, status);
return status;
}
return 0;
}
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