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From:   "M.h. Lian" <minghuan.lian@nxp.com>
To:     "Z.q. Hou" <zhiqiang.hou@nxp.com>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
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        "mark.rutland@arm.com" <mark.rutland@arm.com>,
        "l.subrahmanya@mobiveil.co.in" <l.subrahmanya@mobiveil.co.in>,
        "shawnguo@kernel.org" <shawnguo@kernel.org>,
        Leo Li <leoyang.li@nxp.com>,
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        "catalin.marinas@arm.com" <catalin.marinas@arm.com>,
        "will.deacon@arm.com" <will.deacon@arm.com>
CC:     Mingkai Hu <mingkai.hu@nxp.com>, Xiaowei Bao <xiaowei.bao@nxp.com>
Subject: RE: [PATCHv2 09/25] PCI: mobiveil: correct inbound/outbound window
 setup routines
Thread-Topic: [PATCHv2 09/25] PCI: mobiveil: correct inbound/outbound window
 setup routines
Thread-Index: AQHUgLMfkENIss5XQkaaWgfFbCFRCaVYfwbQ
Date:   Tue, 20 Nov 2018 11:00:29 +0000
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 <20181120092615.11680-10-Zhiqiang.Hou@nxp.com>
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reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>

> -----Original Message-----
> From: Z.q. Hou
> Sent: Tuesday, November 20, 2018 5:27 PM
> To: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> devicetree@vger.kernel.org; linux-kernel@vger.kernel.org;
> bhelgaas@google.com; robh+dt@kernel.org; mark.rutland@arm.com;
> l.subrahmanya@mobiveil.co.in; shawnguo@kernel.org; Leo Li
> <leoyang.li@nxp.com>; lorenzo.pieralisi@arm.com;
> catalin.marinas@arm.com; will.deacon@arm.com
> Cc: Mingkai Hu <mingkai.hu@nxp.com>; M.h. Lian
> <minghuan.lian@nxp.com>; Xiaowei Bao <xiaowei.bao@nxp.com>; Z.q. Hou
> <zhiqiang.hou@nxp.com>
> Subject: [PATCHv2 09/25] PCI: mobiveil: correct inbound/outbound window
> setup routines
>=20
> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>=20
> Outbound window routine:
>  - Removed unused var definition and register read operations.
>  - Added the upper 32-bit cpu address setup of the window.
>  - Instead of blindly write, only change the fields specified.
>  - Masked the lower bits of window size in case override the
>    control bits.
>  - Check if the passing window number is available, instead of
>    the total number of the initialized windows.
>=20
> Inbound window routine:
>  - Added parameter 'u64 cpu_addr' to specify the cpu address
>    of the window instead of using 'pci_addr'.
>  - Changed 'int pci_addr' to 'u64 pci_addr', and added setup
>    of the upper 32-bit pci address of the window.
>  - Moved the PCIe PIO master enablement to mobiveil_host_init().
>  - Instead of blindly write, only change the fields specified.
>  - Masked the lower bits of window size in case override the
>    control bits.
>  - Check if the passing window number is available, instead of
>    the total number of the initialized windows.
>  - And added the statistic of initialized inbound windows.
>=20
> Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP dri=
ver")
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> ---
> V2:
>  - Inbound window setup rountine: clear the size field before set it.
>=20
>  drivers/pci/controller/pcie-mobiveil.c | 70 +++++++++++++++-----------
>  1 file changed, 42 insertions(+), 28 deletions(-)
>=20
> diff --git a/drivers/pci/controller/pcie-mobiveil.c
> b/drivers/pci/controller/pcie-mobiveil.c
> index e88afc792a5c..4ba458474e42 100644
> --- a/drivers/pci/controller/pcie-mobiveil.c
> +++ b/drivers/pci/controller/pcie-mobiveil.c
> @@ -65,9 +65,13 @@
>  #define PAB_AXI_AMAP_CTRL(win)		PAB_REG_ADDR(0x0ba0, win)
>  #define  WIN_ENABLE_SHIFT		0
>  #define  WIN_TYPE_SHIFT			1
> +#define  WIN_TYPE_MASK			0x3
> +#define  WIN_SIZE_SHIFT			10
> +#define  WIN_SIZE_MASK			0x3fffff
>=20
>  #define PAB_EXT_AXI_AMAP_SIZE(win)	PAB_EXT_REG_ADDR(0xbaf0,
> win)
>=20
> +#define PAB_EXT_AXI_AMAP_AXI_WIN(win)	PAB_EXT_REG_ADDR(0x80a0,
> win)
>  #define PAB_AXI_AMAP_AXI_WIN(win)	PAB_REG_ADDR(0x0ba4, win)
>  #define  AXI_WINDOW_ALIGN_MASK		3
>=20
> @@ -82,8 +86,10 @@
>  #define PAB_PEX_AMAP_CTRL(win)		PAB_REG_ADDR(0x4ba0, win)
>  #define  AMAP_CTRL_EN_SHIFT		0
>  #define  AMAP_CTRL_TYPE_SHIFT		1
> +#define  AMAP_CTRL_TYPE_MASK		3
>=20
>  #define PAB_EXT_PEX_AMAP_SIZEN(win)	PAB_EXT_REG_ADDR(0xbef0,
> win)
> +#define PAB_EXT_PEX_AMAP_AXI_WIN(win)	PAB_EXT_REG_ADDR(0xb4a0,
> win)
>  #define PAB_PEX_AMAP_AXI_WIN(win)	PAB_REG_ADDR(0x4ba4, win)
>  #define PAB_PEX_AMAP_PEX_WIN_L(win)	PAB_REG_ADDR(0x4ba8, win)
>  #define PAB_PEX_AMAP_PEX_WIN_H(win)	PAB_REG_ADDR(0x4bac, win)
> @@ -455,49 +461,51 @@ static int mobiveil_pcie_parse_dt(struct
> mobiveil_pcie *pcie)  }
>=20
>  static void program_ib_windows(struct mobiveil_pcie *pcie, int win_num,
> -			       int pci_addr, u32 type, u64 size)
> +			       u64 cpu_addr, u64 pci_addr, u32 type, u64 size)
>  {
> -	int pio_ctrl_val;
> -	int amap_ctrl_dw;
> +	u32 value;
>  	u64 size64 =3D ~(size - 1);
>=20
> -	if ((pcie->ib_wins_configured + 1) > pcie->ppio_wins) {
> +	if (win_num >=3D pcie->ppio_wins) {
>  		dev_err(&pcie->pdev->dev,
>  			"ERROR: max inbound windows reached !\n");
>  		return;
>  	}
>=20
> -	pio_ctrl_val =3D csr_readl(pcie, PAB_PEX_PIO_CTRL);
> -	pio_ctrl_val |=3D 1 << PIO_ENABLE_SHIFT;
> -	csr_writel(pcie, pio_ctrl_val, PAB_PEX_PIO_CTRL);
> -
> -	amap_ctrl_dw =3D csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
> -	amap_ctrl_dw |=3D (type << AMAP_CTRL_TYPE_SHIFT) |
> -			(1 << AMAP_CTRL_EN_SHIFT) |
> -			lower_32_bits(size64);
> -	csr_writel(pcie, amap_ctrl_dw, PAB_PEX_AMAP_CTRL(win_num));
> +	value =3D csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
> +	value &=3D ~(AMAP_CTRL_TYPE_MASK << AMAP_CTRL_TYPE_SHIFT |
> +		 WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> +	value |=3D (type << AMAP_CTRL_TYPE_SHIFT) | (1 <<
> AMAP_CTRL_EN_SHIFT) |
> +		 (lower_32_bits(size64) & WIN_SIZE_MASK <<
> WIN_SIZE_SHIFT);
> +	csr_writel(pcie, value, PAB_PEX_AMAP_CTRL(win_num));
>=20
>  	csr_writel(pcie, upper_32_bits(size64),
>  		   PAB_EXT_PEX_AMAP_SIZEN(win_num));
>=20
> -	csr_writel(pcie, pci_addr, PAB_PEX_AMAP_AXI_WIN(win_num));
> +	csr_writel(pcie, lower_32_bits(cpu_addr),
> +		   PAB_PEX_AMAP_AXI_WIN(win_num));
> +	csr_writel(pcie, upper_32_bits(cpu_addr),
> +		   PAB_EXT_PEX_AMAP_AXI_WIN(win_num));
> +
> +	csr_writel(pcie, lower_32_bits(pci_addr),
> +		   PAB_PEX_AMAP_PEX_WIN_L(win_num));
> +	csr_writel(pcie, upper_32_bits(pci_addr),
> +		   PAB_PEX_AMAP_PEX_WIN_H(win_num));
>=20
> -	csr_writel(pcie, pci_addr, PAB_PEX_AMAP_PEX_WIN_L(win_num));
> -	csr_writel(pcie, 0, PAB_PEX_AMAP_PEX_WIN_H(win_num));
> +	pcie->ib_wins_configured++;
>  }
>=20
>  /*
>   * routine to program the outbound windows
>   */
>  static void program_ob_windows(struct mobiveil_pcie *pcie, int win_num,
> -			       u64 cpu_addr, u64 pci_addr,
> -			       u32 config_io_bit, u64 size)
> +			       u64 cpu_addr, u64 pci_addr, u32 type, u64 size)
>  {
>=20
> -	u32 value, type;
> +	u32 value;
>  	u64 size64 =3D ~(size - 1);
>=20
> -	if ((pcie->ob_wins_configured + 1) > pcie->apio_wins) {
> +	if (win_num >=3D pcie->apio_wins) {
>  		dev_err(&pcie->pdev->dev,
>  			"ERROR: max outbound windows reached !\n");
>  		return;
> @@ -507,10 +515,12 @@ static void program_ob_windows(struct
> mobiveil_pcie *pcie, int win_num,
>  	 * program Enable Bit to 1, Type Bit to (00) base 2, AXI Window Size
> Bit
>  	 * to 4 KB in PAB_AXI_AMAP_CTRL register
>  	 */
> -	type =3D config_io_bit;
>  	value =3D csr_readl(pcie, PAB_AXI_AMAP_CTRL(win_num));
> -	csr_writel(pcie, 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT
> |
> -		   lower_32_bits(size64), PAB_AXI_AMAP_CTRL(win_num));
> +	value &=3D ~(WIN_TYPE_MASK << WIN_TYPE_SHIFT |
> +		 WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> +	value |=3D 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT |
> +		 (lower_32_bits(size64) & WIN_SIZE_MASK <<
> WIN_SIZE_SHIFT);
> +	csr_writel(pcie, value, PAB_AXI_AMAP_CTRL(win_num));
>=20
>  	csr_writel(pcie, upper_32_bits(size64),
> PAB_EXT_AXI_AMAP_SIZE(win_num));
>=20
> @@ -518,11 +528,10 @@ static void program_ob_windows(struct
> mobiveil_pcie *pcie, int win_num,
>  	 * program AXI window base with appropriate value in
>  	 * PAB_AXI_AMAP_AXI_WIN0 register
>  	 */
> -	value =3D csr_readl(pcie, PAB_AXI_AMAP_AXI_WIN(win_num));
> -	csr_writel(pcie, cpu_addr & (~AXI_WINDOW_ALIGN_MASK),
> +	csr_writel(pcie, lower_32_bits(cpu_addr) &
> (~AXI_WINDOW_ALIGN_MASK),
>  		   PAB_AXI_AMAP_AXI_WIN(win_num));
> -
> -	value =3D csr_readl(pcie, PAB_AXI_AMAP_PEX_WIN_H(win_num));
> +	csr_writel(pcie, upper_32_bits(cpu_addr),
> +		   PAB_EXT_AXI_AMAP_AXI_WIN(win_num));
>=20
>  	csr_writel(pcie, lower_32_bits(pci_addr),
>  		   PAB_AXI_AMAP_PEX_WIN_L(win_num));
> @@ -604,6 +613,11 @@ static int mobiveil_host_init(struct mobiveil_pcie
> *pcie)
>  	value |=3D APIO_EN_MASK;
>  	csr_writel(pcie, value, PAB_AXI_PIO_CTRL);
>=20
> +	/* Enable PCIe PIO master */
> +	value =3D csr_readl(pcie, PAB_PEX_PIO_CTRL);
> +	value |=3D 1 << PIO_ENABLE_SHIFT;
> +	csr_writel(pcie, value, PAB_PEX_PIO_CTRL);
> +
>  	/*
>  	 * we'll program one outbound window for config reads and
>  	 * another default inbound window for all the upstream traffic @@ -
> 616,7 +630,7 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie)
>  			   CFG_WINDOW_TYPE, resource_size(pcie-
> >ob_io_res));
>=20
>  	/* memory inbound translation window */
> -	program_ib_windows(pcie, WIN_NUM_0, 0, MEM_WINDOW_TYPE,
> IB_WIN_SIZE);
> +	program_ib_windows(pcie, WIN_NUM_0, 0, 0,
> MEM_WINDOW_TYPE,
> +IB_WIN_SIZE);
>=20
>  	/* Get the I/O and memory ranges from DT */
>  	resource_list_for_each_entry(win, &pcie->resources) {
> --
> 2.17.1