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Message-ID: <20190628164138.GC21829@e121166-lin.cambridge.arm.com>
Date: Fri, 28 Jun 2019 17:41:38 +0100
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: "Z.q. Hou" <zhiqiang.hou@....com>
Cc: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"mark.rutland@....com" <mark.rutland@....com>,
"l.subrahmanya@...iveil.co.in" <l.subrahmanya@...iveil.co.in>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
Leo Li <leoyang.li@....com>,
"catalin.marinas@....com" <catalin.marinas@....com>,
"will.deacon@....com" <will.deacon@....com>,
Mingkai Hu <mingkai.hu@....com>,
"M.h. Lian" <minghuan.lian@....com>,
Xiaowei Bao <xiaowei.bao@....com>
Subject: Re: [PATCHv5 09/20] PCI: mobiveil: Correct inbound/outbound window
setup routines
On Fri, Apr 12, 2019 at 08:36:06AM +0000, Z.q. Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
>
> Outbound window routine:
> - Remove unused var definitions and register read operations.
> - Add the upper 32-bit cpu address setup of the window.
> - Instead of blindly write, only change the fields specified.
> - Mask 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.
>
> Inbound window routine:
> - Add parameter 'u64 cpu_addr' to specify the cpu address
> of the window instead of using 'pci_addr'.
> - Change 'int pci_addr' to 'u64 pci_addr', and add setup
> of the upper 32-bit PCI address of the window.
> - Move the PCIe PIO master enablement to mobiveil_host_init().
> - Instead of blindly write, only change the fields specified.
> - Mask 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 add the statistic of initialized inbound windows.
>
> Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP driver")
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> Reviewed-by: Minghuan Lian <Minghuan.Lian@....com>
> Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
> ---
> V5:
> - Corrected and retouched the subject and changelog.
>
> drivers/pci/controller/pcie-mobiveil.c | 70 +++++++++++++++-----------
> 1 file changed, 42 insertions(+), 28 deletions(-)
There are two things to be done here:
1) Separate fixes from refactoring
2) Each fix should be standalone and solve one problem only
The commit log is a list of changes, some of which I can't
parse.
You should split this patch as described above and repost it
separately but first I will try to merge what I can from this
series, do not repost as yet.
Thanks,
Lorenzo
> 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
>
> #define PAB_EXT_AXI_AMAP_SIZE(win) PAB_EXT_REG_ADDR(0xbaf0, win)
>
> +#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
>
> @@ -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
>
> #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)
> }
>
> 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 = ~(size - 1);
>
> - if ((pcie->ib_wins_configured + 1) > pcie->ppio_wins) {
> + if (win_num >= pcie->ppio_wins) {
> dev_err(&pcie->pdev->dev,
> "ERROR: max inbound windows reached !\n");
> return;
> }
>
> - pio_ctrl_val = csr_readl(pcie, PAB_PEX_PIO_CTRL);
> - pio_ctrl_val |= 1 << PIO_ENABLE_SHIFT;
> - csr_writel(pcie, pio_ctrl_val, PAB_PEX_PIO_CTRL);
> -
> - amap_ctrl_dw = csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
> - amap_ctrl_dw |= (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 = csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num));
> + value &= ~(AMAP_CTRL_TYPE_MASK << AMAP_CTRL_TYPE_SHIFT |
> + WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> + value |= (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));
>
> csr_writel(pcie, upper_32_bits(size64),
> PAB_EXT_PEX_AMAP_SIZEN(win_num));
>
> - 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));
>
> - 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++;
> }
>
> /*
> * 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)
> {
>
> - u32 value, type;
> + u32 value;
> u64 size64 = ~(size - 1);
>
> - if ((pcie->ob_wins_configured + 1) > pcie->apio_wins) {
> + if (win_num >= 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 = config_io_bit;
> value = 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 &= ~(WIN_TYPE_MASK << WIN_TYPE_SHIFT |
> + WIN_SIZE_MASK << WIN_SIZE_SHIFT);
> + value |= 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));
>
> csr_writel(pcie, upper_32_bits(size64), PAB_EXT_AXI_AMAP_SIZE(win_num));
>
> @@ -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 = 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 = 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));
>
> 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 |= APIO_EN_MASK;
> csr_writel(pcie, value, PAB_AXI_PIO_CTRL);
>
> + /* Enable PCIe PIO master */
> + value = csr_readl(pcie, PAB_PEX_PIO_CTRL);
> + value |= 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));
>
> /* 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);
>
> /* Get the I/O and memory ranges from DT */
> resource_list_for_each_entry(win, &pcie->resources) {
> --
> 2.17.1
>
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