path: root/drivers/ata/pata_mpc52xx.c

/*
 * drivers/ata/pata_mpc52xx.c
 *
 * libata driver for the Freescale MPC52xx on-chip IDE interface
 *
 * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2003 Mipsys - Benjamin Herrenschmidt
 *
 * UDMA support based on patches by Freescale (Bernard Kuhn, John Rigby),
 * Domen Puncer and Tim Yamin.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/delay.h>
#include <linux/libata.h>
#include <linux/of_platform.h>
#include <linux/types.h>

#include <asm/cacheflush.h>
#include <asm/prom.h>
#include <asm/mpc52xx.h>

#include <linux/fsl/bestcomm/bestcomm.h>
#include <linux/fsl/bestcomm/bestcomm_priv.h>
#include <linux/fsl/bestcomm/ata.h>

#define DRV_NAME	"mpc52xx_ata"

/* Private structures used by the driver */
struct mpc52xx_ata_timings {
	u32	pio1;
	u32	pio2;
	u32	mdma1;
	u32	mdma2;
	u32	udma1;
	u32	udma2;
	u32	udma3;
	u32	udma4;
	u32	udma5;
	int	using_udma;
};

struct mpc52xx_ata_priv {
	unsigned int			ipb_period;
	struct mpc52xx_ata __iomem	*ata_regs;
	phys_addr_t			ata_regs_pa;
	int				ata_irq;
	struct mpc52xx_ata_timings	timings[2];
	int				csel;

	/* DMA */
	struct bcom_task		*dmatsk;
	const struct udmaspec		*udmaspec;
	const struct mdmaspec		*mdmaspec;
	int 				mpc52xx_ata_dma_last_write;
	int				waiting_for_dma;
};


/* ATAPI-4 PIO specs (in ns) */
static const u16 ataspec_t0[5]		= {600, 383, 240, 180, 120};
static const u16 ataspec_t1[5]		= { 70,  50,  30,  30,  25};
static const u16 ataspec_t2_8[5]	= {290, 290, 290,  80,  70};
static const u16 ataspec_t2_16[5]	= {165, 125, 100,  80,  70};
static const u16 ataspec_t2i[5]		= {  0,   0,   0,  70,  25};
static const u16 ataspec_t4[5]		= { 30,  20,  15,  10,  10};
static const u16 ataspec_ta[5]		= { 35,  35,  35,  35,  35};

#define CALC_CLKCYC(c,v) ((((v)+(c)-1)/(c)))

/* ======================================================================== */

/* ATAPI-4 MDMA specs (in clocks) */
struct mdmaspec {
	u8 t0M;
	u8 td;
	u8 th;
	u8 tj;
	u8 tkw;
	u8 tm;
	u8 tn;
};

static const struct mdmaspec mdmaspec66[3] = {
	{ .t0M = 32, .td = 15, .th = 2, .tj = 2, .tkw = 15, .tm = 4, .tn = 1 },
	{ .t0M = 10, .td = 6,  .th = 1, .tj = 1, .tkw = 4,  .tm = 2, .tn = 1 },
	{ .t0M = 8,  .td = 5,  .th = 1, .tj = 1, .tkw = 2,  .tm = 2, .tn = 1 },
};

static const struct mdmaspec mdmaspec132[3] = {
	{ .t0M = 64, .td = 29, .th = 3, .tj = 3, .tkw = 29, .tm = 7, .tn = 2 },
	{ .t0M = 20, .td = 11, .th = 2, .tj = 1, .tkw = 7,  .tm = 4, .tn = 1 },
	{ .t0M = 16, .td = 10, .th = 2, .tj = 1, .tkw = 4,  .tm = 4, .tn = 1 },
};

/* ATAPI-4 UDMA specs (in clocks) */
struct udmaspec {
	u8 tcyc;
	u8 t2cyc;
	u8 tds;
	u8 tdh;
	u8 tdvs;
	u8 tdvh;
	u8 tfs;
	u8 tli;
	u8 tmli;
	u8 taz;
	u8 tzah;
	u8 tenv;
	u8 tsr;
	u8 trfs;
	u8 trp;
	u8 tack;
	u8 tss;
};

static const struct udmaspec udmaspec66[6] = {
	{ .tcyc = 8,  .t2cyc = 16, .tds  = 1,  .tdh  = 1, .tdvs = 5,  .tdvh = 1,
	  .tfs  = 16, .tli   = 10, .tmli = 2,  .taz  = 1, .tzah = 2,  .tenv =