board/ar7240/common/ar7240_pci.c

/*
 * Copyright (c) 2013 Qualcomm Atheros, Inc.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <command.h>
#include <asm/mipsregs.h>
#include <asm/addrspace.h>
#include <config.h>
#include <version.h>
#include <pci.h>
#include "ar7240_soc.h"

/*
** PCI controller "hose" value
*/

static struct pci_controller hose;

static int  ar7240_local_read_config(int where, int size, uint32_t *value);
static int  ar7240_local_write_config(int where, int size, uint32_t value);

static int
ar7240_local_read_config(int where, int size, uint32_t *value)
{
    *value = ar7240_reg_rd(AR7240_PCI_CRP + where);
    return 0;
}

static int
ar7240_local_write_config(int where, int size, uint32_t value)
{
    ar7240_reg_wr((AR7240_PCI_CRP + where),value);
    return 0;
}

static int
ar7240_pci_read_config(struct pci_controller *hose,
                           pci_dev_t dev, int where, uint32_t *value)
{
        *value = ar7240_reg_rd(AR7240_PCI_DEV_CFGBASE + where);
        return 0;
}

static int
ar7240_pci_write_config(struct pci_controller *hose,
                           pci_dev_t dev, int where,  uint32_t value)
{
        ar7240_reg_wr((AR7240_PCI_DEV_CFGBASE + where),value);
        return 0;
}

/*
** We will use the ART configuration information stored in flash to initialize
** these devices as required.
*/

void plat_dev_init(void)
{
    u32     val;
    u32     addr;
    u32     BaseAddr = 0x10000000;
    u32     CalAddr = WLANCAL;
    volatile u16     *calData;

    /*
     * Copy the device ID from Flash to device config space.
     */

    calData = (u16 *)CalAddr;

#ifndef CONFIG_PCI_CONFIG_DATA_IN_OTP
    if(calData[0] != 0xa55a && calData[0] != 0x5aa5  )
    {
        /*
        ** Board is not calibrated.
        */
#ifndef COMPRESSED_UBOOT
        printf("BOARD IS NOT CALIBRATED!!!\n");
#endif
        return;
    }
#else
    return;
#endif
    /*
    ** Need to setup the PCI device to access the internal registers
    */
    if ((is_ar7241() || is_ar7242()))
        ar7240_pci_write_config(&hose, NULL, 0x10, 0x1000ffff);
    else
        ar7240_pci_write_config(&hose, NULL, 0x10, 0xffff);

    ar7240_pci_write_config(&hose, NULL, 0x04, 0x6);

    /*
    ** Set pointer to first reg address
    */

    calData += AR7240_ART_PCICFG_OFFSET;

    while(*calData != 0xffff)
    {
        u16 cd;

        cd = *calData++;
        addr = BaseAddr + cd;
        val  = *calData++;
        val |= (*calData++) << 16;

        ar7240_reg_wr_nf(addr,val);
        udelay(100);
    }

    return;
}


/******************************************************************************/
/*!
**  \brief pci host initialization
**
**  Sets up the PCI controller on the host.  For AR7240 this may not be necessary,
**  but this function is required for board support.
**
** We want a 1:1 mapping between PCI and DDR for inbound and outbound.
** The PCI<---AHB decoding works as follows:
**
** 8 registers in the DDR unit provide software configurable 32 bit offsets
** for each of the eight 16MB PCI windows in the 128MB. The offsets will be
** added to any address in the 16MB segment before being sent to the PCI unit.
**
** Essentially  for any AHB address generated by the CPU,
** 1. the MSB  four bits are stripped off, [31:28],
** 2. Bit 27 is used to decide between the lower 128Mb (PCI) or the rest of
**    the AHB space
** 3. Bits 26:24 are used to access one of the 8 window registers and are
**    masked off.
** 4. If it is a PCI address, then the WINDOW offset in the WINDOW register
**    corresponding to the next 3 bits (bit 26:24) is ADDED to the address,
**    to generate the address to PCI unit.
**
**     eg. CPU address = 0x100000ff
**         window 0 offset = 0x10000000
**         This points to lowermost 16MB window in PCI space.
**         So the resulting address would be 0x000000ff+0x10000000
**         = 0x100000ff
**
**         eg2. CPU address = 0x120000ff
**         WINDOW 2 offset = 0x12000000
**         resulting address would be 0x000000ff+0x12000000
**                         = 0x120000ff
**
** There is no translation for inbound access (PCI device as a master)
**
**  \return N/A
*/

#ifdef CONFIG_WASP_SUPPORT
static int ar7240_pcibios_init(void)
{
        if (is_ar9341()) {
                return 0;
        }

	if (((ar7240_reg_rd(AR7240_PCI_LCL_RESET)) & 0x1) == 0x0) {
		printf("***** Warning *****: PCIe WLAN H/W not found !!!\n");
		return 0;
	}

	return 1;
}

#define pci_udelay(n)	do { uint32_t i; /* printf("--- %s[%d] udelay(%u)\n", __func__, __LINE__, n); */ for (i = 0; i < ((n)/10); i++) udelay(10); } while (0)

char *
__print_llx(unsigned long long u, char *num)
{
	char dec[] = "0123456789";
	int i;

	if (u == 0)	return "0";

	memset(num, 0, 32);

	for (i = 24; u; i--) {
		num[i] = dec[u % 10];
		u = u / 10;
	}

	return &num[i+1];
}

#define print_llx(n)	__print_llx(n, str_##n)

#ifdef COMPRESSED_UBOOT
int pci_init_board (void)
#else
void pci_init_board (void)
#endif /* #ifdef COMPRESSED_UBOOT */
{
#ifdef CONFIG_AP123
	return;
#else
	uint32_t cmd = 0, reg_val;


	//printf("%s: PCIe PLL 0x%x\n", __func__, mips3_cp0_count_read());
	//printf("%s: PCIe PLL 0x%x  0xb8000008 =  0x%08x\n", __func__, mips3_cp0_count_read(), ar7240_reg_rd(0xb8040008));

	pci_udelay(100000);
	//count ++;

	if ((ar7240_reg_rd(WASP_BOOTSTRAP_REG) & WASP_REF_CLK_25) == 0) {
		ar7240_reg_wr_nf(AR934X_PCIE_PLL_DITHER_DIV_MAX,
			PCIE_PLL_DITHER_DIV_MAX_EN_DITHER_SET(0) |
			PCIE_PLL_DITHER_DIV_MAX_USE_MAX_SET(1) |
			PCIE_PLL_DITHER_DIV_MAX_DIV_MAX_INT_SET(0x20) |
			PCIE_PLL_DITHER_DIV_MAX_DIV_MAX_FRAC_SET(0));
	} else {
#ifndef COMPRESSED_UBOOT
		printf("%s: PCIe PLL not set for 40MHz refclk\n", __func__);
#endif
	}

	ar7240_reg_rmw_set(AR7240_RESET, AR7240_RESET_PCIE);	// core in reset
	pci_udelay(10000);
	ar7240_reg_rmw_set(AR7240_RESET, AR7240_RESET_PCIE_PHY);// phy in reset
	pci_udelay(10000);
	ar7240_reg_rmw_clear(RST_MISC2_ADDRESS, RST_MISC2_PERSTN_RCPHY_SET(1)); // pci phy analog in reset
	pci_udelay(10000);
	ar7240_reg_wr(0x180f0000, 0x1ffc0);			// ltssm is disabled
	pci_udelay(100);
	ar7240_reg_wr_nf(AR7240_PCI_LCL_RESET, 0);	// End point in reset
	pci_udelay(100000);


	//ar7240_reg_rmw_clear(AR7240_RESET, AR7240_RESET_PCIE_PHY);

	if ((ar7240_reg_rd(AR7240_REV_ID) & 0xf) == 0) {
		ar7240_reg_wr_nf(AR934X_PCIE_PLL_CONFIG,
			PCIE_PLL_CONFIG_REFDIV_SET(1) |
			PCIE_PLL_CONFIG_BYPASS_SET(1) |
			PCIE_PLL_CONFIG_PLLPWD_SET(1));
		pci_udelay(10000);
		ar7240_reg_wr_nf(AR934X_PCIE_PLL_CONFIG,
			PCIE_PLL_CONFIG_REFDIV_SET(1) |
			PCIE_PLL_CONFIG_BYPASS_SET(1) |
			PCIE_PLL_CONFIG_PLLPWD_SET(0));
		pci_udelay(1000);
		ar7240_reg_wr_nf(AR934X_PCIE_PLL_CONFIG,
			ar7240_reg_rd(AR934X_PCIE_PLL_CONFIG) &
			(~PCIE_PLL_CONFIG_BYPASS_SET(1)));
		pci_udelay(1000);
	} else {
		ar7240_reg_wr_nf(AR934X_PCIE_PLL_CONFIG,
			PCIE_PLL_CONFIG_REFDIV_SET(2) |
			PCIE_PLL_CONFIG_BYPASS_SET(1) |
			PCIE_PLL_CONFIG_PLLPWD_SET(1));
		pci_udelay(10000);

		if ((ar7240_reg_rd(WASP_BOOTSTRAP_REG) & WASP_REF_CLK_25) == 0) {
			ar7240_reg_wr_nf(0xb8116c00, (0x5 << 27) | (160 << 18) | 0);
		} else {
			ar7240_reg_wr_nf(0xb8116c00, (0x2 << 27) | (0x28 << 18) | 0);
		}
		do {
			ar7240_reg_wr_nf(0xb8116c04, (0x1 << 30) | (0x4 << 26) | (0x32 << 19) | (1 << 16) | (3 << 13) | (0x1e << 7));
			ar7240_reg_wr_nf(0xb8116c08, (6 << 23));
			pci_udelay(10000);
			ar7240_reg_wr_nf(0xb8116c04, (0x1 << 30) | (0x4 << 26) | (0x32 << 19) | (3 << 13) | (0x1e << 7));

			ar7240_reg_rmw_clear(KSEG1ADDR(PCIe_DPLL3_ADDRESS), PCIe_DPLL3_DO_MEAS_SET(1));
			ar7240_reg_rmw_set(KSEG1ADDR(PCIe_DPLL3_ADDRESS), PCIe_DPLL3_DO_MEAS_SET(1));

			ar7240_reg_wr(0xb804000c, 1 << 2);

			pci_udelay(1000);

			while (((cmd = ar7240_reg_rd(PCIe_DPLL4_ADDRESS)) & PCIe_DPLL4_MEAS_DONE_SET(1)) == 0) {
				printf("0x%x 0x%x 0x%x\n", KSEG1ADDR(PCIe_DPLL4_ADDRESS), cmd);
				pci_udelay(10);
			}

			{ int i; for (i = 0; i < 100; i++) udelay(10); }
#if 0
			msdvc = PCIe_DPLL4_MEAN_DVC_GET(cmd);
			cmd = PCIe_DPLL3_SQSUM_DVC_GET(ar7240_reg_rd(PCIe_DPLL3_ADDRESS));

			if (msdvc & 0x400) msdvc = ((~msdvc & 0x7FF) + 1); /* 11 bit signed number , but not intentioanlly multiply by (-1), ASK VIPUL*/
			msdvc =  cmd - (msdvc *msdvc);
			msdvc_sq = msdvc * msdvc;

			if (cmd >= 0x40000) {
				err_count++;
				if (sqsum_min_fail == 0)
					sqsum_min_fail = cmd;
				if (cmd > sqsum_max_fail)
					sqsum_max_fail = cmd;
				if (cmd < sqsum_min_fail)
					sqsum_min_fail = cmd;
				sqsum_avg_fail = (sqsum_avg_fail - (sqsum_avg_fail / err_count)) + (cmd / err_count);

				if (num_pll_loops == 0)
					err_pll1++;
				if (num_pll_loops == 1)
					err_pll2++;
				if (num_pll_loops == 2)
					err_pll3++;
				if (num_pll_loops == 3)
					err_pll4++;
				if (num_pll_loops == 4) {
					err_pll5++;
					break;
				}
			} else {
				if (sqsum_min == 0)
					sqsum_min = cmd;
				if (cmd < sqsum_min)
					sqsum_min = cmd;
				if (cmd > sqsum_max)
					sqsum_max = cmd;
				//sqsum_avg = (sqsum_avg - (sqsum_avg / count)) + (cmd / count);
				sqsum_avg += cmd;

				/*msdvc calc*/
				if (msdvc_min == 0) msdvc_min = msdvc;
				if (msdvc < msdvc_min) msdvc_min =msdvc;
				if (msdvc > msdvc_max) msdvc_max =msdvc;
				msdvc_avg += msdvc;
				msdvc_sq_avg += msdvc_sq;

			}
			num_pll_loops++;
#endif

		} while ((cmd = PCIe_DPLL3_SQSUM_DVC_GET(ar7240_reg_rd(PCIe_DPLL3_ADDRESS))) >= 0x40000);

		ar7240_reg_rmw_clear(AR934X_PCIE_PLL_CONFIG, PCIE_PLL_CONFIG_PLLPWD_SET(1));
		pci_udelay(10000);
		ar7240_reg_rmw_clear(AR934X_PCIE_PLL_CONFIG, PCIE_PLL_CONFIG_BYPASS_SET(1));
		pci_udelay(10000);

		/*
		 * PCIe Dithering configuration
		 */
		if (is_ar934x_12_or_later()) {
			ar7240_reg_wr_nf(PCIe_DPLL2_ADDRESS,
					PCIe_DPLL2_LOCAL_PLL_SET(0) | 
					PCIe_DPLL2_KI_SET(0x4)| 
					PCIe_DPLL2_KD_SET(0x40));
			ar7240_reg_wr_nf(AR934X_PCIE_PLL_CONFIG, 0x40010800);
			ar7240_reg_wr_nf(AR934X_PCIE_PLL_DITHER_DIV_MAX, 0xc013fffe);
			ar7240_reg_wr_nf(AR934X_PCIE_PLL_DITHER_DIV_MIN, 0x0013e666);

			ar7240_reg_wr_nf(AR934X_PCIE_PLL_CONFIG, 0x00010800);  
			ar7240_reg_wr_nf(AR934X_PCIE_PLL_CONFIG, 0x00000800);  
		}

		//run_command("md 0xb8116c00 4", 0);
	}
	ar7240_reg_rmw_set(RST_MISC2_ADDRESS, RST_MISC2_PERSTN_RCPHY_SET(1)); // pci phy analog out of reset
	pci_udelay(10000);

	ar7240_reg_rmw_clear(AR7240_RESET, AR7240_RESET_PCIE_PHY);	// phy out of reset
	pci_udelay(10000);

	ar7240_reg_rmw_clear(AR7240_RESET, AR7240_RESET_PCIE);	// core out of reset
	pci_udelay(1000);

	cmd = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE |
	      PCI_COMMAND_PARITY|PCI_COMMAND_SERR|PCI_COMMAND_FAST_BACK;

	ar7240_local_write_config(PCI_COMMAND, 4, cmd);		// pci cmd reg init
	ar7240_local_write_config(0x20, 4, 0x1ff01000);		// membase setting
	ar7240_local_write_config(0x24, 4, 0x1ff01000);		// prefetch membase setting


	if ((is_ar7241() || is_ar7242() || is_wasp())) {
		ar7240_reg_wr(0x180f0000, 0x1ffc1);		// ltssm enable
	} else {
		ar7240_reg_wr(0x180f0000, 0x1);
	}
	pci_udelay(100000);

	ar7240_reg_wr_nf(AR7240_PCI_LCL_RESET, 4);		// EP out of reset
	pci_udelay(100000);


#ifdef COMPRESSED_UBOOT
	pci_udelay(100);
#else
	/*
	 *  Delay increased from 100 to 1000, so as to
	 *  get the correct status from PCI LCL RESET register
	 */
	pci_udelay(100000);

	/*
	 * Check if the WLAN PCI-E H/W is present, If the
	 * WLAN H/W is not present, skip the PCI platform
	 * initialization code and return
	 */

	if (((ar7240_reg_rd(AR7240_PCI_LCL_RESET)) & 0x1) == 0x0) {
		printf("*** Warning *** : PCIe WLAN Module not found !!!\n");
		return;
	}
#endif

#ifndef COMPRESSED_UBOOT
	/*
	 * Now, configure for u-boot tools
	 */

	hose.first_busno = 0;
	hose.last_busno = 0xff;

	/* System space */
	pci_set_region(	&hose.regions[0],
			0x80000000,
			0x00000000,
			32 * 1024 * 1024,
			PCI_REGION_MEM | PCI_REGION_MEMORY);

	/* PCI memory space */
	pci_set_region(	&hose.regions[1],
			0x10000000,
			0x10000000,
			128 * 1024 * 1024,
			PCI_REGION_MEM);

	hose.region_count = 2;

	pci_register_hose(&hose);

	pci_set_ops(	&hose,
			pci_hose_read_config_byte_via_dword,
			pci_hose_read_config_word_via_dword,
			ar7240_pci_read_config,
			pci_hose_write_config_byte_via_dword,
			pci_hose_write_config_word_via_dword,
			ar7240_pci_write_config);
#endif
	plat_dev_init();
#endif	// CONFIG_AP123
#ifdef COMPRESSED_UBOOT
	return 0;
#endif
}
#else
// For non - wasp
#ifdef COMPRESSED_UBOOT
int pci_init_board (void)
#else
void pci_init_board (void)
#endif /* #ifdef COMPRESSED_UBOOT */
{
	uint32_t cmd;


	ar7240_reg_rmw_clear(AR7240_RESET,AR7240_RESET_PCIE_PHY_SERIAL);
	udelay(100);

	ar7240_reg_rmw_clear(AR7240_RESET, AR7240_RESET_PCIE_PHY);


	ar7240_reg_rmw_clear(AR7240_RESET, AR7240_RESET_PCIE);

	ar7240_reg_wr_nf(AR7240_PCI_LCL_RESET, 0);
	udelay(100000);

	/*
	 * Initialize PCIE PLL and get it out of RESET
	 */
	ar7240_reg_wr(AR7240_PCIE_PLL_CONFIG,0x02050800);

	ar7240_reg_wr(AR7240_PCIE_PLL_CONFIG,0x00050800);
	udelay(100);

	ar7240_reg_wr(AR7240_PCIE_PLL_CONFIG,0x00040800);
	udelay(100000);

	ar7240_reg_wr_nf(AR7240_PCI_LCL_RESET, 4);
	udelay(100000);

	cmd = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE |
	      PCI_COMMAND_PARITY|PCI_COMMAND_SERR|PCI_COMMAND_FAST_BACK;

	ar7240_local_write_config(PCI_COMMAND, 4, cmd);
	ar7240_local_write_config(0x20, 4, 0x1ff01000);
	ar7240_local_write_config(0x24, 4, 0x1ff01000);

	if ((is_ar7241() || is_ar7242() || is_wasp())) {
		ar7240_reg_wr(0x180f0000, 0x1ffc1);
	} else {
		ar7240_reg_wr(0x180f0000, 0x1);
	}

#ifdef COMPRESSED_UBOOT
	udelay(100);
#else
	udelay(1000);

	/*
	 * Check if the WLAN PCI-E H/W is present, If the
	 * WLAN H/W is not present, skip the PCI platform
	 * initialization code and return
	 */

	if (((ar7240_reg_rd(AR7240_PCI_LCL_RESET)) & 0x1) == 0x0) {
		printf("*** Warning *** : PCIe WLAN Module not found !!!\n");
		return;
	}
#endif

#ifndef COMPRESSED_UBOOT
	/*
	 * Now, configure for u-boot tools
	 */

	hose.first_busno = 0;
	hose.last_busno = 0xff;

	/* System space */
	pci_set_region(	&hose.regions[0],
			0x80000000,
			0x00000000,
			32 * 1024 * 1024,
			PCI_REGION_MEM | PCI_REGION_MEMORY);

	/* PCI memory space */
	pci_set_region(	&hose.regions[1],
			0x10000000,
			0x10000000,
			128 * 1024 * 1024,
			PCI_REGION_MEM);

	hose.region_count = 2;

	pci_register_hose(&hose);

	pci_set_ops(	&hose,
			pci_hose_read_config_byte_via_dword,
			pci_hose_read_config_word_via_dword,
			ar7240_pci_read_config,
			pci_hose_write_config_byte_via_dword,
			pci_hose_write_config_word_via_dword,
			ar7240_pci_write_config);
#endif
	plat_dev_init();
#ifdef COMPRESSED_UBOOT
	return 0;
#endif
}
#endif /* CONFIG_WASP_SUPPORT */