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spear1340.c
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spear1340.c
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/*
* arch/arm/mach-spear13xx/spear1340.c
*
* SPEAr1340 machine source file
*
* Copyright (C) 2012 ST Microelectronics
* Viresh Kumar <[email protected]>
*
* 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.
*/
#define pr_fmt(fmt) "SPEAr1340: " fmt
#include <linux/ahci_platform.h>
#include <linux/amba/serial.h>
#include <linux/delay.h>
#include <linux/of_platform.h>
#include <linux/irqchip.h>
#include <asm/mach/arch.h>
#include "generic.h"
#include <mach/spear.h>
/* FIXME: Move SATA PHY code into a standalone driver */
/* Base addresses */
#define SPEAR1340_SATA_BASE UL(0xB1000000)
/* Power Management Registers */
#define SPEAR1340_PCM_CFG (VA_MISC_BASE + 0x100)
#define SPEAR1340_PCM_WKUP_CFG (VA_MISC_BASE + 0x104)
#define SPEAR1340_SWITCH_CTR (VA_MISC_BASE + 0x108)
#define SPEAR1340_PERIP1_SW_RST (VA_MISC_BASE + 0x318)
#define SPEAR1340_PERIP2_SW_RST (VA_MISC_BASE + 0x31C)
#define SPEAR1340_PERIP3_SW_RST (VA_MISC_BASE + 0x320)
/* PCIE - SATA configuration registers */
#define SPEAR1340_PCIE_SATA_CFG (VA_MISC_BASE + 0x424)
/* PCIE CFG MASks */
#define SPEAR1340_PCIE_CFG_DEVICE_PRESENT (1 << 11)
#define SPEAR1340_PCIE_CFG_POWERUP_RESET (1 << 10)
#define SPEAR1340_PCIE_CFG_CORE_CLK_EN (1 << 9)
#define SPEAR1340_PCIE_CFG_AUX_CLK_EN (1 << 8)
#define SPEAR1340_SATA_CFG_TX_CLK_EN (1 << 4)
#define SPEAR1340_SATA_CFG_RX_CLK_EN (1 << 3)
#define SPEAR1340_SATA_CFG_POWERUP_RESET (1 << 2)
#define SPEAR1340_SATA_CFG_PM_CLK_EN (1 << 1)
#define SPEAR1340_PCIE_SATA_SEL_PCIE (0)
#define SPEAR1340_PCIE_SATA_SEL_SATA (1)
#define SPEAR1340_SATA_PCIE_CFG_MASK 0xF1F
#define SPEAR1340_PCIE_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_PCIE | \
SPEAR1340_PCIE_CFG_AUX_CLK_EN | \
SPEAR1340_PCIE_CFG_CORE_CLK_EN | \
SPEAR1340_PCIE_CFG_POWERUP_RESET | \
SPEAR1340_PCIE_CFG_DEVICE_PRESENT)
#define SPEAR1340_SATA_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_SATA | \
SPEAR1340_SATA_CFG_PM_CLK_EN | \
SPEAR1340_SATA_CFG_POWERUP_RESET | \
SPEAR1340_SATA_CFG_RX_CLK_EN | \
SPEAR1340_SATA_CFG_TX_CLK_EN)
#define SPEAR1340_PCIE_MIPHY_CFG (VA_MISC_BASE + 0x428)
#define SPEAR1340_MIPHY_OSC_BYPASS_EXT (1 << 31)
#define SPEAR1340_MIPHY_CLK_REF_DIV2 (1 << 27)
#define SPEAR1340_MIPHY_CLK_REF_DIV4 (2 << 27)
#define SPEAR1340_MIPHY_CLK_REF_DIV8 (3 << 27)
#define SPEAR1340_MIPHY_PLL_RATIO_TOP(x) (x << 0)
#define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA \
(SPEAR1340_MIPHY_OSC_BYPASS_EXT | \
SPEAR1340_MIPHY_CLK_REF_DIV2 | \
SPEAR1340_MIPHY_PLL_RATIO_TOP(60))
#define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK \
(SPEAR1340_MIPHY_PLL_RATIO_TOP(120))
#define SPEAR1340_PCIE_SATA_MIPHY_CFG_PCIE \
(SPEAR1340_MIPHY_OSC_BYPASS_EXT | \
SPEAR1340_MIPHY_PLL_RATIO_TOP(25))
/* SATA device registration */
static int sata_miphy_init(struct device *dev, void __iomem *addr)
{
writel(SPEAR1340_SATA_CFG_VAL, SPEAR1340_PCIE_SATA_CFG);
writel(SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK,
SPEAR1340_PCIE_MIPHY_CFG);
/* Switch on sata power domain */
writel((readl(SPEAR1340_PCM_CFG) | (0x800)), SPEAR1340_PCM_CFG);
msleep(20);
/* Disable PCIE SATA Controller reset */
writel((readl(SPEAR1340_PERIP1_SW_RST) & (~0x1000)),
SPEAR1340_PERIP1_SW_RST);
msleep(20);
return 0;
}
void sata_miphy_exit(struct device *dev)
{
writel(0, SPEAR1340_PCIE_SATA_CFG);
writel(0, SPEAR1340_PCIE_MIPHY_CFG);
/* Enable PCIE SATA Controller reset */
writel((readl(SPEAR1340_PERIP1_SW_RST) | (0x1000)),
SPEAR1340_PERIP1_SW_RST);
msleep(20);
/* Switch off sata power domain */
writel((readl(SPEAR1340_PCM_CFG) & (~0x800)), SPEAR1340_PCM_CFG);
msleep(20);
}
int sata_suspend(struct device *dev)
{
if (dev->power.power_state.event == PM_EVENT_FREEZE)
return 0;
sata_miphy_exit(dev);
return 0;
}
int sata_resume(struct device *dev)
{
if (dev->power.power_state.event == PM_EVENT_THAW)
return 0;
return sata_miphy_init(dev, NULL);
}
static struct ahci_platform_data sata_pdata = {
.init = sata_miphy_init,
.exit = sata_miphy_exit,
.suspend = sata_suspend,
.resume = sata_resume,
};
/* Add SPEAr1340 auxdata to pass platform data */
static struct of_dev_auxdata spear1340_auxdata_lookup[] __initdata = {
OF_DEV_AUXDATA("snps,spear-ahci", SPEAR1340_SATA_BASE, NULL,
&sata_pdata),
{}
};
static void __init spear1340_dt_init(void)
{
of_platform_populate(NULL, of_default_bus_match_table,
spear1340_auxdata_lookup, NULL);
}
static const char * const spear1340_dt_board_compat[] = {
"st,spear1340",
"st,spear1340-evb",
NULL,
};
DT_MACHINE_START(SPEAR1340_DT, "ST SPEAr1340 SoC with Flattened Device Tree")
.smp = smp_ops(spear13xx_smp_ops),
.map_io = spear13xx_map_io,
.init_irq = irqchip_init,
.init_time = spear13xx_timer_init,
.init_machine = spear1340_dt_init,
.restart = spear_restart,
.dt_compat = spear1340_dt_board_compat,
MACHINE_END