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openwrt/target/linux/imx6/files-3.10/arch/arm/mach-imx/pcie.c
Luka Perkov af6eb6cc8c imx6: add support for gw5400-a 
Signed-off-by: Tim Harvey <tharvey@gateworks.com>

SVN-Revision: 37363
2013-07-15 23:18:39 +00:00

1038 lines
28 KiB
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/*
* arch/arm/mach-imx/pcie.c
*
* PCIe host controller driver for IMX6 SOCs
*
* Copyright (C) 2012 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2013 Tim Harvey <tharvey@gateworks.com>
*
* Bits taken from arch/arm/mach-dove/pcie.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <asm/signal.h>
#include <asm/mach/pci.h>
#include <asm/sizes.h>
#include "msi.h"
/* PCIe Registers */
#define PCIE_ARB_BASE_ADDR 0x01000000
#define PCIE_ARB_END_ADDR 0x01FFFFFF
#define PCIE_RC_IOBLSSR 0x1c
/* Register Definitions */
#define PRT_LOG_R_BaseAddress 0x700
/* Register DB_R0 */
/* Debug Register 0 */
#define DB_R0 (PRT_LOG_R_BaseAddress + 0x28)
#define DB_R0_RegisterSize 32
#define DB_R0_RegisterResetValue 0x0
#define DB_R0_RegisterResetMask 0xFFFFFFFF
/* End of Register Definition for DB_R0 */
/* Register DB_R1 */
/* Debug Register 1 */
#define DB_R1 (PRT_LOG_R_BaseAddress + 0x2c)
#define DB_R1_RegisterSize 32
#define DB_R1_RegisterResetValue 0x0
#define DB_R1_RegisterResetMask 0xFFFFFFFF
/* End of Register Definition for DB_R1 */
#define PCIE_PL_MSICA 0x820
#define PCIE_PL_MSICUA 0x824
#define PCIE_PL_MSIC_INT 0x828
#define MSIC_INT_EN 0x0
#define MSIC_INT_MASK 0x4
#define MSIC_INT_STATUS 0x8
#define ATU_R_BaseAddress 0x900
#define ATU_VIEWPORT_R (ATU_R_BaseAddress + 0x0)
#define ATU_REGION_CTRL1_R (ATU_R_BaseAddress + 0x4)
#define ATU_REGION_CTRL2_R (ATU_R_BaseAddress + 0x8)
#define ATU_REGION_LOWBASE_R (ATU_R_BaseAddress + 0xC)
#define ATU_REGION_UPBASE_R (ATU_R_BaseAddress + 0x10)
#define ATU_REGION_LIMIT_ADDR_R (ATU_R_BaseAddress + 0x14)
#define ATU_REGION_LOW_TRGT_ADDR_R (ATU_R_BaseAddress + 0x18)
#define ATU_REGION_UP_TRGT_ADDR_R (ATU_R_BaseAddress + 0x1C)
/* IOMUXC */
#define IOMUXC_GPR_BASE_ADDR 0x020E0000
#define IOMUXC_GPR1 (imx_pcie.gpr_base + 0x04)
#define IOMUXC_GPR8 (imx_pcie.gpr_base + 0x20)
#define IOMUXC_GPR12 (imx_pcie.gpr_base + 0x30)
/* GPR1: iomuxc_gpr1_pcie_ref_clk_en(iomuxc_gpr1[16]) */
#define iomuxc_gpr1_pcie_ref_clk_en (1 << 16)
/* GPR1: iomuxc_gpr1_test_powerdown(iomuxc_gpr1_18) */
#define iomuxc_gpr1_test_powerdown (1 << 18)
/* GPR12: iomuxc_gpr12_los_level(iomuxc_gpr12[8:4]) */
#define iomuxc_gpr12_los_level (0x1F << 4)
/* GPR12: iomuxc_gpr12_app_ltssm_enable(iomuxc_gpr12[10]) */
#define iomuxc_gpr12_app_ltssm_enable (1 << 10)
/* GPR12: iomuxc_gpr12_device_type(iomuxc_gpr12[15:12]) */
#define iomuxc_gpr12_device_type (0xF << 12)
/* GPR8: iomuxc_gpr8_tx_deemph_gen1(iomuxc_gpr8[5:0]) */
#define iomuxc_gpr8_tx_deemph_gen1 (0x3F << 0)
/* GPR8: iomuxc_gpr8_tx_deemph_gen2_3p5db(iomuxc_gpr8[11:6]) */
#define iomuxc_gpr8_tx_deemph_gen2_3p5db (0x3F << 6)
/* GPR8: iomuxc_gpr8_tx_deemph_gen2_6db(iomuxc_gpr8[17:12]) */
#define iomuxc_gpr8_tx_deemph_gen2_6db (0x3F << 12)
/* GPR8: iomuxc_gpr8_tx_swing_full(iomuxc_gpr8[24:18]) */
#define iomuxc_gpr8_tx_swing_full (0x7F << 18)
/* GPR8: iomuxc_gpr8_tx_swing_low(iomuxc_gpr8[31:25]) */
#define iomuxc_gpr8_tx_swing_low (0x7F << 25)
/* Registers of PHY */
/* Register PHY_STS_R */
/* PHY Status Register */
#define PHY_STS_R (PRT_LOG_R_BaseAddress + 0x110)
/* Register PHY_CTRL_R */
/* PHY Control Register */
#define PHY_CTRL_R (PRT_LOG_R_BaseAddress + 0x114)
#define SSP_CR_SUP_DIG_MPLL_OVRD_IN_LO 0x0011
/* FIELD: RES_ACK_IN_OVRD [15:15]
// FIELD: RES_ACK_IN [14:14]
// FIELD: RES_REQ_IN_OVRD [13:13]
// FIELD: RES_REQ_IN [12:12]
// FIELD: RTUNE_REQ_OVRD [11:11]
// FIELD: RTUNE_REQ [10:10]
// FIELD: MPLL_MULTIPLIER_OVRD [9:9]
// FIELD: MPLL_MULTIPLIER [8:2]
// FIELD: MPLL_EN_OVRD [1:1]
// FIELD: MPLL_EN [0:0]
*/
#define SSP_CR_SUP_DIG_ATEOVRD 0x0010
/* FIELD: ateovrd_en [2:2]
// FIELD: ref_usb2_en [1:1]
// FIELD: ref_clkdiv2 [0:0]
*/
#define SSP_CR_LANE0_DIG_RX_OVRD_IN_LO 0x1005
/* FIELD: RX_LOS_EN_OVRD [13:13]
// FIELD: RX_LOS_EN [12:12]
// FIELD: RX_TERM_EN_OVRD [11:11]
// FIELD: RX_TERM_EN [10:10]
// FIELD: RX_BIT_SHIFT_OVRD [9:9]
// FIELD: RX_BIT_SHIFT [8:8]
// FIELD: RX_ALIGN_EN_OVRD [7:7]
// FIELD: RX_ALIGN_EN [6:6]
// FIELD: RX_DATA_EN_OVRD [5:5]
// FIELD: RX_DATA_EN [4:4]
// FIELD: RX_PLL_EN_OVRD [3:3]
// FIELD: RX_PLL_EN [2:2]
// FIELD: RX_INVERT_OVRD [1:1]
// FIELD: RX_INVERT [0:0]
*/
#define SSP_CR_LANE0_DIG_RX_ASIC_OUT 0x100D
/* FIELD: LOS [2:2]
// FIELD: PLL_STATE [1:1]
// FIELD: VALID [0:0]
*/
/* control bus bit definition */
#define PCIE_CR_CTL_DATA_LOC 0
#define PCIE_CR_CTL_CAP_ADR_LOC 16
#define PCIE_CR_CTL_CAP_DAT_LOC 17
#define PCIE_CR_CTL_WR_LOC 18
#define PCIE_CR_CTL_RD_LOC 19
#define PCIE_CR_STAT_DATA_LOC 0
#define PCIE_CR_STAT_ACK_LOC 16
#define PCIE_CAP_STRUC_BaseAddress 0x70
/* Register LNK_CAP */
/* PCIE Link cap */
#define LNK_CAP (PCIE_CAP_STRUC_BaseAddress + 0xc)
/* End of Register Definitions */
enum {
MemRdWr = 0,
MemRdLk = 1,
IORdWr = 2,
CfgRdWr0 = 4,
CfgRdWr1 = 5
};
struct imx_pcie_port {
u8 index;
u8 root_bus_nr;
void __iomem *base;
void __iomem *dbi_base;
spinlock_t conf_lock;
char io_space_name[16];
char mem_space_name[16];
struct resource res[2];
struct clk *clk;
};
struct imx_pcie_info {
struct imx_pcie_port imx_pcie_port[1];
int num_pcie_ports;
void __iomem *base;
void __iomem *dbi_base;
void __iomem *gpr_base;
unsigned int pcie_pwr_en;
unsigned int pcie_rst;
unsigned int pcie_wake_up;
unsigned int pcie_dis;
};
static struct imx_pcie_info imx_pcie;
static int pcie_phy_cr_read(int addr, int *data);
static int pcie_phy_cr_write(int addr, int data);
static void change_field(int *in, int start, int end, int val);
/* IMX PCIE GPR configure routines */
static inline void imx_pcie_clrset(u32 mask, u32 val, void __iomem *addr)
{
writel(((readl(addr) & ~mask) | (val & mask)), addr);
}
static int imx_pcie_setup(int nr, struct pci_sys_data *sys)
{
struct imx_pcie_port *pp;
if (nr >= imx_pcie.num_pcie_ports)
return 0;
pp = &imx_pcie.imx_pcie_port[nr];
pp->root_bus_nr = sys->busnr;
/*
* IORESOURCE_IO
*/
snprintf(pp->io_space_name, sizeof(pp->io_space_name),
"PCIe %d I/O", pp->index);
pp->io_space_name[sizeof(pp->io_space_name) - 1] = 0;
pp->res[0].name = pp->io_space_name;
if (pp->index == 0) {
pp->res[0].start = PCIE_ARB_BASE_ADDR;
pp->res[0].end = pp->res[0].start + SZ_1M - 1;
}
pp->res[0].flags = IORESOURCE_IO;
if (request_resource(&ioport_resource, &pp->res[0]))
panic("Request PCIe IO resource failed\n");
pci_add_resource_offset(&sys->resources, &pp->res[0], sys->io_offset);
/*
* IORESOURCE_MEM
*/
snprintf(pp->mem_space_name, sizeof(pp->mem_space_name),
"PCIe %d MEM", pp->index);
pp->mem_space_name[sizeof(pp->mem_space_name) - 1] = 0;
pp->res[1].name = pp->mem_space_name;
if (pp->index == 0) {
pp->res[1].start = PCIE_ARB_BASE_ADDR + SZ_1M;
pp->res[1].end = pp->res[1].start + SZ_16M - SZ_2M - 1;
}
pp->res[1].flags = IORESOURCE_MEM;
if (request_resource(&iomem_resource, &pp->res[1]))
panic("Request PCIe Memory resource failed\n");
pci_add_resource_offset(&sys->resources, &pp->res[1], sys->mem_offset);
return 1;
}
static int imx_pcie_link_up(void __iomem *dbi_base)
{
/* Check the pcie link up or link down */
int iterations = 200;
u32 rc, ltssm, rx_valid, temp;
do {
/* link is debug bit 36 debug 1 start in bit 32 */
rc = readl(dbi_base + DB_R1) & (0x1 << (36 - 32)) ;
iterations--;
usleep_range(2000, 3000);
/* From L0, initiate MAC entry to gen2 if EP/RC supports gen2.
* Wait 2ms (LTSSM timeout is 24ms, PHY lock is ~5us in gen2).
* If (MAC/LTSSM.state == Recovery.RcvrLock)
* && (PHY/rx_valid==0) then pulse PHY/rx_reset. Transition
* to gen2 is stuck
*/
pcie_phy_cr_read(SSP_CR_LANE0_DIG_RX_ASIC_OUT, &rx_valid);
ltssm = readl(dbi_base + DB_R0) & 0x3F;
if ((ltssm == 0x0D) && ((rx_valid & 0x01) == 0)) {
pr_info("Transition to gen2 is stuck, reset PHY!\n");
pcie_phy_cr_read(SSP_CR_LANE0_DIG_RX_OVRD_IN_LO, &temp);
change_field(&temp, 3, 3, 0x1);
change_field(&temp, 5, 5, 0x1);
pcie_phy_cr_write(SSP_CR_LANE0_DIG_RX_OVRD_IN_LO,
0x0028);
usleep_range(2000, 3000);
pcie_phy_cr_read(SSP_CR_LANE0_DIG_RX_OVRD_IN_LO, &temp);
change_field(&temp, 3, 3, 0x0);
change_field(&temp, 5, 5, 0x0);
pcie_phy_cr_write(SSP_CR_LANE0_DIG_RX_OVRD_IN_LO,
0x0000);
}
if ((iterations < 0))
pr_info("link up failed, DB_R0:0x%08x, DB_R1:0x%08x!\n"
, readl(dbi_base + DB_R0)
, readl(dbi_base + DB_R1));
} while (!rc && iterations);
if (!rc)
return 0;
return 1;
}
static void imx_pcie_regions_setup(void __iomem *dbi_base)
{
unsigned bus;
unsigned i;
unsigned untranslated_base = PCIE_ARB_END_ADDR +1 - SZ_1M;
void __iomem *p = dbi_base + PCIE_PL_MSIC_INT;
/*
* i.MX6 defines 16MB in the AXI address map for PCIe.
*
* That address space excepted the pcie registers is
* split and defined into different regions by iATU,
* with sizes and offsets as follows:
*
* 0x0100_0000 --- 0x010F_FFFF 1MB IORESOURCE_IO
* 0x0110_0000 --- 0x01EF_FFFF 14MB IORESOURCE_MEM
* 0x01F0_0000 --- 0x01FF_FFFF 1MB Cfg + Registers
*/
/* CMD reg:I/O space, MEM space, and Bus Master Enable */
writel(readl(dbi_base + PCI_COMMAND)
| PCI_COMMAND_IO
| PCI_COMMAND_MEMORY
| PCI_COMMAND_MASTER,
dbi_base + PCI_COMMAND);
/* Set the CLASS_REV of RC CFG header to PCI_CLASS_BRIDGE_PCI */
writel(readl(dbi_base + PCI_CLASS_REVISION)
| (PCI_CLASS_BRIDGE_PCI << 16),
dbi_base + PCI_CLASS_REVISION);
/*
* region0-3 outbound used to access target cfg
*/
for (bus = 1; bus <= 4; bus++) {
writel(bus - 1, dbi_base + ATU_VIEWPORT_R);
writel(untranslated_base, dbi_base + ATU_REGION_LOWBASE_R);
untranslated_base += (1 << 18);
if (bus == 4)
untranslated_base -= (1 << 14); //(remove registers)
writel(untranslated_base - 1, dbi_base + ATU_REGION_LIMIT_ADDR_R);
writel(0, dbi_base + ATU_REGION_UPBASE_R);
writel(bus << 24, dbi_base + ATU_REGION_LOW_TRGT_ADDR_R);
writel(0, dbi_base + ATU_REGION_UP_TRGT_ADDR_R);
writel((bus > 1) ? CfgRdWr1 : CfgRdWr0,
dbi_base + ATU_REGION_CTRL1_R);
writel((1<<31), dbi_base + ATU_REGION_CTRL2_R);
}
writel(MSI_MATCH_ADDR, dbi_base + PCIE_PL_MSICA);
writel(0, dbi_base + PCIE_PL_MSICUA);
for (i = 0; i < 8 ; i++) {
writel(0, p + MSIC_INT_EN);
writel(0xffffffff, p + MSIC_INT_MASK);
writel(0xffffffff, p + MSIC_INT_STATUS);
p += 12;
}
}
void imx_pcie_mask_irq(unsigned pos, int set)
{
unsigned mask = 1 << (pos & 0x1f);
unsigned val, newval;
void __iomem *p = imx_pcie.dbi_base + PCIE_PL_MSIC_INT + MSIC_INT_MASK + ((pos >> 5) * 12);
if (pos >= (8 * 32))
return;
val = readl(p);
if (set)
newval = val | mask;
else
newval = val & ~mask;
if (val != newval)
writel(newval, p);
}
void imx_pcie_enable_irq(unsigned pos, int set)
{
unsigned mask = 1 << (pos & 0x1f);
unsigned val, newval;
void __iomem *p = imx_pcie.dbi_base + PCIE_PL_MSIC_INT + MSIC_INT_EN + ((pos >> 5) * 12);
if (pos >= (8 * 32))
return;
val = readl(p);
if (set)
newval = val | mask;
else
newval = val & ~mask;
if (val != newval)
writel(newval, p);
if (set && (val != newval))
imx_pcie_mask_irq(pos, 0); /* unmask when enabled */
}
unsigned imx_pcie_msi_pending(unsigned index)
{
unsigned val, mask;
void __iomem *p = imx_pcie.dbi_base + PCIE_PL_MSIC_INT + (index * 12);
if (index >= 8)
return 0;
val = readl(p + MSIC_INT_STATUS);
mask = readl(p + MSIC_INT_MASK);
val &= ~mask;
writel(val, p + MSIC_INT_STATUS);
return val;
}
static char master_abort(struct pci_bus *bus, u32 devfn, int where)
{
u32 reg;
void __iomem *dbi_base = imx_pcie.dbi_base;
int ret = 0;
reg = readl(dbi_base + PCIE_RC_IOBLSSR);
if (reg & 0x71000000) {
if (reg & 1<<30)
pr_err("%d:%02d.%d 0x%04x: parity error\n", bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where);
if (reg & 1<<29) {
pr_err("%d:%02d.%d 0x%04x: master abort\n", bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where);
ret = 1;
}
if (reg & 1<<28)
pr_err("%d:%02d.%d 0x%04x: target abort\n", bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where);
if (reg & 1<<24)
pr_err("%d:%02d.%d 0x%04x: master data parity error\n", bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where);
writel(reg, dbi_base + PCIE_RC_IOBLSSR);
udelay(1500); // without this delay subsequent reads through bridge can erroneously return 0???
}
return ret;
}
static volatile void *get_cfg_addr(struct pci_bus *bus, u32 devfn, int where)
{
unsigned busnum;
void __iomem *base = imx_pcie.base;
void __iomem *dbi_base = imx_pcie.dbi_base;
if (!bus->number) {
if (devfn != 0)
return 0;
return (imx_pcie.dbi_base) + (where & 0x0ffc);
}
if ((devfn > 0xff) || (bus->number > 15))
return 0;
busnum = bus->number - 1;
if ((busnum < 3) && (devfn <= 3)) {
return (base) + (busnum << 18) + (devfn << 16) + (where & 0xfffc);
}
writel(3, dbi_base + ATU_VIEWPORT_R);
writel((bus->number << 24) | (devfn << 16),
dbi_base + ATU_REGION_LOW_TRGT_ADDR_R);
writel((bus->number > 1) ? CfgRdWr1 : CfgRdWr0,
dbi_base + ATU_REGION_CTRL1_R);
return (base) + (3 << 18) + (where & 0xfffc);
}
static int imx_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
int size, u32 *val)
{
const volatile void *va_address;
u32 v;
if (0)
pr_info("%s: bus=%x, devfn=%x, where=%x size=%x\n", __func__, bus->number, devfn, where, size);
va_address = get_cfg_addr(bus, devfn, where);
if (!va_address) {
*val = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(va_address);
if (master_abort(bus, devfn, where)) {
return PCIBIOS_DEVICE_NOT_FOUND;
}
if (0)
pr_info("%s: bus=%x, devfn=%x, where=%x size=%x v=%x\n", __func__, bus->number, devfn, where, size, v);
if (size == 4) {
*val = v;
} else if (size == 1) {
*val = (v >> (8 * (where & 3))) & 0xFF;
} else if (size == 2) {
*val = (v >> (8 * (where & 3))) & 0xFFFF;
} else {
*val = 0xffffffff;
return PCIBIOS_BAD_REGISTER_NUMBER;
}
return PCIBIOS_SUCCESSFUL;
}
static int imx_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
int where, int size, u32 val)
{
volatile void *va_address;
u32 mask, tmp;
if (0)
pr_info("%s: bus=%x, devfn=%x, where=%x size=%x val=%x\n", __func__, bus->number, devfn, where, size, val);
va_address = get_cfg_addr(bus, devfn, where);
if (!va_address)
return PCIBIOS_DEVICE_NOT_FOUND;
if (size == 4) {
writel(val, va_address);
return (master_abort(bus, devfn, where))
?PCIBIOS_DEVICE_NOT_FOUND:PCIBIOS_SUCCESSFUL;
}
if (size == 2)
mask = ~(0xFFFF << ((where & 0x3) * 8));
else if (size == 1)
mask = ~(0xFF << ((where & 0x3) * 8));
else
return PCIBIOS_BAD_REGISTER_NUMBER;
tmp = readl(va_address) & mask;
tmp |= val << ((where & 0x3) * 8);
writel(tmp, va_address);
return (master_abort(bus, devfn, where))
?PCIBIOS_DEVICE_NOT_FOUND:PCIBIOS_SUCCESSFUL;
}
static struct pci_ops imx_pcie_ops = {
.read = imx_pcie_rd_conf,
.write = imx_pcie_wr_conf,
};
signed short irq_map[] = {
-EINVAL,
MXC_INT_PCIE_3, /* int a */
MXC_INT_PCIE_2, /* int b */
MXC_INT_PCIE_1, /* int c */
MXC_INT_PCIE_0, /* int d/MSI */
};
static int imx_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
int val = -EINVAL;
if (pin <= 4)
val = irq_map[pin];
return val;
}
static struct hw_pci imx_pci __initdata = {
.nr_controllers = 1,
.setup = imx_pcie_setup,
.ops = &imx_pcie_ops,
.map_irq = imx_pcie_map_irq,
};
/* PHY CR bus acess routines */
static int pcie_phy_cr_ack_polling(int max_iterations, int exp_val)
{
u32 temp_rd_data, wait_counter = 0;
do {
temp_rd_data = readl(imx_pcie.dbi_base + PHY_STS_R);
temp_rd_data = (temp_rd_data >> PCIE_CR_STAT_ACK_LOC) & 0x1;
wait_counter++;
} while ((wait_counter < max_iterations) && (temp_rd_data != exp_val));
if (temp_rd_data != exp_val)
return 0 ;
return 1 ;
}
static int pcie_phy_cr_cap_addr(int addr)
{
u32 temp_wr_data;
void __iomem *dbi_base = imx_pcie.dbi_base;
/* write addr */
temp_wr_data = addr << PCIE_CR_CTL_DATA_LOC ;
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* capture addr */
temp_wr_data |= (0x1 << PCIE_CR_CTL_CAP_ADR_LOC);
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* wait for ack */
if (!pcie_phy_cr_ack_polling(100, 1))
return 0;
/* deassert cap addr */
temp_wr_data = addr << PCIE_CR_CTL_DATA_LOC;
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* wait for ack de-assetion */
if (!pcie_phy_cr_ack_polling(100, 0))
return 0 ;
return 1 ;
}
static int pcie_phy_cr_read(int addr , int *data)
{
u32 temp_rd_data, temp_wr_data;
void __iomem *dbi_base = imx_pcie.dbi_base;
/* write addr */
/* cap addr */
if (!pcie_phy_cr_cap_addr(addr))
return 0;
/* assert rd signal */
temp_wr_data = 0x1 << PCIE_CR_CTL_RD_LOC;
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* wait for ack */
if (!pcie_phy_cr_ack_polling(100, 1))
return 0;
/* after got ack return data */
temp_rd_data = readl(dbi_base + PHY_STS_R);
*data = (temp_rd_data & (0xffff << PCIE_CR_STAT_DATA_LOC)) ;
/* deassert rd signal */
temp_wr_data = 0x0;
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* wait for ack de-assetion */
if (!pcie_phy_cr_ack_polling(100, 0))
return 0 ;
return 1 ;
}
static int pcie_phy_cr_write(int addr, int data)
{
u32 temp_wr_data;
void __iomem *dbi_base = imx_pcie.dbi_base;
/* write addr */
/* cap addr */
if (!pcie_phy_cr_cap_addr(addr))
return 0 ;
temp_wr_data = data << PCIE_CR_CTL_DATA_LOC;
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* capture data */
temp_wr_data |= (0x1 << PCIE_CR_CTL_CAP_DAT_LOC);
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* wait for ack */
if (!pcie_phy_cr_ack_polling(100, 1))
return 0 ;
/* deassert cap data */
temp_wr_data = data << PCIE_CR_CTL_DATA_LOC;
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* wait for ack de-assetion */
if (!pcie_phy_cr_ack_polling(100, 0))
return 0;
/* assert wr signal */
temp_wr_data = 0x1 << PCIE_CR_CTL_WR_LOC;
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* wait for ack */
if (!pcie_phy_cr_ack_polling(100, 1))
return 0;
/* deassert wr signal */
temp_wr_data = data << PCIE_CR_CTL_DATA_LOC;
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
/* wait for ack de-assetion */
if (!pcie_phy_cr_ack_polling(100, 0))
return 0;
temp_wr_data = 0x0 ;
writel(temp_wr_data, dbi_base + PHY_CTRL_R);
return 1 ;
}
static void change_field(int *in, int start, int end, int val)
{
int mask;
mask = ((0xFFFFFFFF << start) ^ (0xFFFFFFFF << (end + 1))) & 0xFFFFFFFF;
*in = (*in & ~mask) | (val << start);
}
static int imx_pcie_enable_controller(struct device *dev)
{
struct clk *clk;
struct device_node *np = dev->of_node;
if (gpio_is_valid(imx_pcie.pcie_pwr_en)) {
/* Enable PCIE power */
gpio_request(imx_pcie.pcie_pwr_en, "PCIE POWER_EN");
/* activate PCIE_PWR_EN */
gpio_direction_output(imx_pcie.pcie_pwr_en, 1);
}
// power up PCIe PHY
imx_pcie_clrset(iomuxc_gpr1_test_powerdown, 0 << 18, IOMUXC_GPR1);
/* enable the clks */
if (np)
clk = of_clk_get(np, 0);
else
clk = devm_clk_get(dev, "pcie_clk");
if (IS_ERR(clk)) {
pr_err("no pcie clock.\n");
return -EINVAL;
}
if (clk_prepare_enable(clk)) {
pr_err("can't enable pcie clock.\n");
clk_put(clk);
return -EINVAL;
}
// Enable PCIe PHY ref clock
imx_pcie_clrset(iomuxc_gpr1_pcie_ref_clk_en, 1 << 16, IOMUXC_GPR1);
return 0;
}
static void card_reset(struct device *dev)
{
if (gpio_is_valid(imx_pcie.pcie_rst)) {
/* PCIE RESET */
gpio_request(imx_pcie.pcie_rst, "PCIE RESET");
/* activate PERST_B */
gpio_direction_output(imx_pcie.pcie_rst, 0);
/* Add one reset to the pcie external device */
msleep(100);
/* deactive PERST_B */
gpio_direction_output(imx_pcie.pcie_rst, 1);
}
}
static void add_pcie_port(struct platform_device *pdev, void __iomem *base, void __iomem *dbi_base)
{
struct clk *clk;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
if (imx_pcie_link_up(dbi_base)) {
struct imx_pcie_port *pp = &imx_pcie.imx_pcie_port[imx_pcie.num_pcie_ports++];
pr_info("IMX PCIe port: link up.\n");
pp->index = 0;
pp->root_bus_nr = -1;
pp->base = base;
pp->dbi_base = dbi_base;
spin_lock_init(&pp->conf_lock);
memset(pp->res, 0, sizeof(pp->res));
} else {
pr_info("IMX PCIe port: link down!\n");
/* Release the clocks, and disable the power */
if (np)
clk = of_clk_get(np, 0);
else
clk = clk_get(NULL, "pcie_clk");
if (IS_ERR(clk)) {
pr_err("no pcie clock.\n");
return;
}
clk_disable_unprepare(clk);
clk_put(clk);
// Disable the PCIE PHY Ref Clock
imx_pcie_clrset(iomuxc_gpr1_pcie_ref_clk_en, 0 << 16, IOMUXC_GPR1);
if (gpio_is_valid(imx_pcie.pcie_pwr_en)) {
/* Disable PCIE power */
gpio_request(imx_pcie.pcie_pwr_en, "PCIE POWER_EN");
/* activate PCIE_PWR_EN */
gpio_direction_output(imx_pcie.pcie_pwr_en, 0);
}
// Power down PCIE PHY
imx_pcie_clrset(iomuxc_gpr1_test_powerdown, 1 << 18, IOMUXC_GPR1);
}
}
static int imx_pcie_abort_handler(unsigned long addr, unsigned int fsr,
struct pt_regs *regs)
{
unsigned long instr;
unsigned long pc = instruction_pointer(regs) - 4;
instr = *(unsigned long *)pc;
/* imprecise aborts are no longer enabled in 3.7+ during init it would appear.
* We now using PCIE_RC_IOBLSSR to detect master abort however we will still get
* at least one imprecise abort and need to have a handler.
*/
#if 0
if (instr == 0xf57ff04f) {
/* dsb sy */
pc -= 4;
instr = *(unsigned long *)pc;
}
pr_info("PCIe abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx instr=%08lx\n",
addr, fsr, regs->ARM_pc, regs->ARM_lr, instr);
/*
* If the instruction being executed was a read,
* make it look like it read all-ones.
*/
if ((instr & 0x0c500000) == 0x04100000) {
/* LDR instruction */
int reg = (instr >> 12) & 15;
regs->uregs[reg] = -1;
regs->ARM_pc = pc + 4;
return 0;
}
return 1;
#else
pr_info("PCIe abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx instr=%08lx\n",
addr, fsr, regs->ARM_pc, regs->ARM_lr, instr);
return 0;
#endif
}
static int imx_pcie_pltfm_probe(struct platform_device *pdev)
{
struct resource *mem;
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node;
struct resource res;
int ret;
if (!np) {
dev_err(&pdev->dev, "No of data found\n");
return -EINVAL;
}
res.start = res.end = 0;
ret = of_address_to_resource(np, 0, &res);
if (ret)
goto err;
mem = &res;
imx_pcie.pcie_pwr_en = of_get_named_gpio(np, "pwren-gpios", 0);
imx_pcie.pcie_rst = of_get_named_gpio(np, "rst-gpios", 0);
imx_pcie.pcie_wake_up = of_get_named_gpio(np, "wake-gpios", 0);
imx_pcie.pcie_dis = of_get_named_gpio(np, "dis-gpios", 0);
//pdev->dev.platform_data = pdata;
imx_pcie.base = ioremap_nocache(PCIE_ARB_END_ADDR - SZ_1M + 1, SZ_1M - SZ_16K);
if (!imx_pcie.base) {
pr_err("error with ioremap in function %s\n", __func__);
return -EIO;
}
imx_pcie.dbi_base = devm_ioremap(dev, mem->start, resource_size(mem));
if (!imx_pcie.dbi_base) {
dev_err(dev, "can't map %pR\n", mem);
return -ENOMEM;
}
np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-iomuxc-gpr");
if (!np) {
dev_err(dev, "can't find iomux\n");
return -ENOMEM;
}
ret = of_address_to_resource(np, 0, &res);
of_node_put(np);
if (ret)
goto err;
mem = &res;
imx_pcie.gpr_base = devm_ioremap(dev, mem->start, resource_size(mem));
if (!imx_pcie.gpr_base) {
dev_err(dev, "can't map %pR\n", mem);
return -ENOMEM;
}
// hold LTSSM in detect state
imx_pcie_clrset(iomuxc_gpr12_app_ltssm_enable, 0 << 10, IOMUXC_GPR12);
/* configure constant input signal to the pcie ctrl and phy */
// set device type to RC (PCI_EXP_TYPE_ROOT_PORT=4 is from pcie_regs.h)
imx_pcie_clrset(iomuxc_gpr12_device_type, PCI_EXP_TYPE_ROOT_PORT << 12, IOMUXC_GPR12);
// loss of signal detect sensitivity function - must be 0x9
imx_pcie_clrset(iomuxc_gpr12_los_level, 9 << 4, IOMUXC_GPR12);
// not clear what values these should have from RM
imx_pcie_clrset(iomuxc_gpr8_tx_deemph_gen1, 0 << 0, IOMUXC_GPR8);
imx_pcie_clrset(iomuxc_gpr8_tx_deemph_gen2_3p5db, 0 << 6, IOMUXC_GPR8);
imx_pcie_clrset(iomuxc_gpr8_tx_deemph_gen2_6db, 20 << 12, IOMUXC_GPR8);
imx_pcie_clrset(iomuxc_gpr8_tx_swing_full, 127 << 18, IOMUXC_GPR8);
imx_pcie_clrset(iomuxc_gpr8_tx_swing_low, 127 << 25, IOMUXC_GPR8);
/* Enable the pwr, clks and so on */
ret = imx_pcie_enable_controller(dev);
if (ret)
goto err;
/* togle the external card's reset */
card_reset(dev) ;
usleep_range(3000, 4000);
imx_pcie_regions_setup(imx_pcie.dbi_base);
usleep_range(3000, 4000);
/*
* Force to GEN1 because of PCIE2USB storage stress tests
* would be failed when GEN2 is enabled
*/
writel(((readl(imx_pcie.dbi_base + LNK_CAP) & 0xfffffff0) | 0x1),
imx_pcie.dbi_base + LNK_CAP);
/* start link up */
imx_pcie_clrset(iomuxc_gpr12_app_ltssm_enable, 1 << 10, IOMUXC_GPR12);
hook_fault_code(16 + 6, imx_pcie_abort_handler, SIGBUS, 0,
"imprecise external abort");
/* add the pcie port */
add_pcie_port(pdev, imx_pcie.base, imx_pcie.dbi_base);
pci_common_init(&imx_pci);
return 0;
err:
return ret;
}
static int imx_pcie_pltfm_remove(struct platform_device *pdev)
{
struct clk *clk;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
/* Release clocks, and disable power */
if (np)
clk = of_clk_get(np, 0);
else
clk = devm_clk_get(dev, "pcie_clk");
if (IS_ERR(clk))
pr_err("no pcie clock.\n");
if (clk) {
clk_disable_unprepare(clk);
clk_put(clk);
}
// disable PCIe PHY clock ref
imx_pcie_clrset(iomuxc_gpr1_pcie_ref_clk_en, 0 << 16, IOMUXC_GPR1);
if (gpio_is_valid(imx_pcie.pcie_pwr_en)) {
/* Disable PCIE power */
gpio_request(imx_pcie.pcie_pwr_en, "PCIE POWER_EN");
/* activate PCIE_PWR_EN */
gpio_direction_output(imx_pcie.pcie_pwr_en, 0);
}
// power down PCIe PHY
imx_pcie_clrset(iomuxc_gpr1_test_powerdown, 1 << 18, IOMUXC_GPR1);
iounmap(imx_pcie.base);
iounmap(imx_pcie.dbi_base);
iounmap(imx_pcie.gpr_base);
release_mem_region(iomem->start, resource_size(iomem));
//platform_set_drvdata(pdev, NULL);
return 0;
}
static const struct of_device_id of_imx_pcie_match[] = {
{ .compatible = "fsl,pcie" },
{}
};
MODULE_DEVICE_TABLE(of, of_imx_pcie_match);
static struct platform_driver imx_pcie_pltfm_driver = {
.driver = {
.name = "imx-pcie",
.owner = THIS_MODULE,
.of_match_table = of_imx_pcie_match,
},
.probe = imx_pcie_pltfm_probe,
.remove = imx_pcie_pltfm_remove,
};
/*****************************************************************************\
* *
* Driver init/exit *
* *
\*****************************************************************************/
static int __init imx_pcie_drv_init(void)
{
pcibios_min_io = 0;
pcibios_min_mem = 0;
return platform_driver_register(&imx_pcie_pltfm_driver);
}
static void __exit imx_pcie_drv_exit(void)
{
platform_driver_unregister(&imx_pcie_pltfm_driver);
}
//module_init(imx_pcie_drv_init);
//module_exit(imx_pcie_drv_exit);
late_initcall(imx_pcie_drv_init);
MODULE_DESCRIPTION("i.MX PCIE platform driver");
MODULE_LICENSE("GPL v2");
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